Procurement of steel doors in the shop. Independent production of a metal door: an exclusive door on your own

Products manufactured by the factory steel doors, it will be beneficial to differ from self-made structures. A high-quality front door should combine reliability and respectable appearance, and also, have a number of important operational qualities: burglary resistance, noise insulation, thermal insulation, structural strength and resistance to various external influences.

There is a huge selection of steel doors on the market, both foreign and Russian-made. A big plus of domestic manufacturers is the manufacture of doors to order according to individual parameters, a huge selection of finishes and a relatively low price.

Equipment for the manufacture of metal doors

Basically, the manufacture of iron doors is carried out in two ways: on fully automated lines of large factories, where one door takes up to 10 minutes, and semi-automatic lines using manual labor.

In the first case, the main advantage is the low defect rate, due to the lack of a human factor, and production volumes: such an enterprise is capable of producing up to 500 doors per day!

The disadvantages include the high cost of equipment and its maintenance and the amount of required production area.

On semi-automatic lines, things go more slowly - the same day is spent on the manufacture of only 20 metal doors, or even less. Here the need for qualified personnel, but despite this, the percentage of marriage is much higher than the rate of automated production. The advantages include quite a lifting amount of start-up capital for the purchase of equipment and small areas required for production.

Cutting patterns and blanks from steel sheet

The production of a metal door begins with careful measurements and selection of the metal itself. After entering the plant, steel sheets are carefully checked for deformation and corrosion and stored separately in specially equipped rooms. Optimal Thickness steel sheet 2-3mm. At the request of the customer, the door is also made of 5 mm steel.

From the selected sheet, a blank of the future door is cut out with a cutout for all mounting holes for locks and hinges. Accuracy is provided by a special computer program.

From the same sheet with a metal stamp, details are cut into blanks for the door frame. Apart from steel frame the door also uses stiffeners that provide strength to the entire structure. Profiles are located inside vertically and horizontally, which allows you to strengthen the door leaf to the maximum.

The door can also be made not from a single sheet, but by welding several steel sheets. The price of such a product will be significantly lower, as well as its strength indicators.

In this case, seamless welding is used to avoid bursting seams during installation and further operation.

Unscrupulous Chinese manufacturers have established the production and sale of doors from reinforced foil sheets. Such products are easily and quickly hacked by anyone. household tool from a knife to a hammer, and their installation is advisable only on empty objects where only minimal protection is needed, for example, from precipitation or wild animals.

The remaining blanks are given the necessary shape for the manufacture of a door profile on bending machine. The shape of the bends is precisely maintained according to the technical specifications.

Electric arc welding welds the hinges to the racks of the door and the door frame. Compliance with the exact dimensions during installation is provided by clamps that hold the loops at the right distance. This fixture is called a door frame assembly jig.

Welding parts into a single whole

In the meantime, assembly or, in other words, scalding takes place. Parts of the door frame are placed on the table and the door leaf with reinforcing corners is laid on top. After the structure is fixed with clamps, it begins spot welding. At the points of contact of the welding machine with the steel sheet, rivets of molten metal appear, indicating that the structure is securely fastened.

At the same time, the correct geometry of the door frame is strictly observed: all angles are 90 °.

Before passing technical control, where all gaps, welds and overall build quality will be checked, all joints are ground and cleaned, all burrs and the so-called “dross” are removed. After that, the future door is washed with a phosphate solution, which not only washes away dirt and oil, but also covers it with a special film that protects against rust.

Next in line is the painting stage. With the help of a special device, a special powder paint is applied to the door, which is resistant to chips and, of course, corrosion, and sent to the oven for 30 minutes at 210 °.

The final stage of production

In parallel, in another part of the workshop, interior decoration is being prepared: an overlay is cut from MDF boards with drawing on milling machine. At the request of the customer, this overlay is fitted with one of the selected coatings: artificial or Genuine Leather, laminate, plastic or decorative film. Finishing options can be selected to suit every taste.

In the assembly shop, the assembly process begins with fitting the locks, which are additionally protected by armor plates. The choice of locks is no less important than the choice of the manufacturer of the door and the material from which it is made. The best option a combination of two locks is considered: lever and cylinder. In this case, you can be sure high level burglary resistance of the door. Also, the door is equipped with a peephole and handles.

voids door leaf filled with mineral wool, which will improve heat and sound insulation performance. AT budget options the use of polystyrene and other inexpensive materials. In places where the door leaf fits, to protect against wind and dust, a seal is laid, which also increases the thermal insulation properties of the door.

At the ends of the door, flashings are installed, which are designed to cover the porch of the structure.

They also bridge existing gaps and open spaces by collecting door space into a whole.

Installation and service

Despite the fact that the installation stage is final, it is no less important than all the others. It is better to entrust this work to professionals - the door manufacturers themselves. Then you can be sure that the installation will take place in compliance with all the norms and rules of installation and the new door will serve faithfully for many years.

Now, more and more often, representatives of Russian production and foreign factories do not stop at this stage, but offer additional service maintenance. If the key is lost, the lock or the door handle is broken, there is no need to run around the shops, independently look for a replacement and a master to do the work. The door manufacturer will take care of everything and take care of this.

Modern steel door structures are not exclusively reliable protection buildings, but also an element of the interior and exterior. The technology for creating steel blocks is quite remarkable, which is worth considering.

Steel door blocks: necessary equipment for starting a business

Steel metal systems spread

The main attribute of each building lies in the presence of a reliable overlap of the entrance. Worth mentioning manufacturing process manufacturing stages of iron structures.

So each manufacturer is trying to make the production of steel doors more modernized, and developers in modern times use exclusively metal blocks to block the entrance to new buildings. Today, manufacturers are trying to improve not only the technical performance of systems, but the aesthetic side of the product from a design point of view in relation to the latest trends in interior stylistic fashion.

The business of manufacturing iron structures is not particularly complicated, so any entrepreneur can give life to such a production. So list necessary equipment for production purposes, it is permissible to fit into a single table:

The above list of equipment refers to the minimum required equipment. So on

Machine for the manufacture of structures

ready-made complex lines for the production of steel blocks are available on the world market, where all the machines and installations listed above are combined. Typical production lines can be fully automated or partially automated, when a human hand must be applied to a certain stage.

Such automated lines are often produced in the world by foreign manufacturers and are endowed with the following list of equipment:

• Installation of plasma cutting of metal;
• Press for bending metal sheets;
• Automatic coordinate welding of door leaves;
• Two machines for the welding process with tongs with conductors;
• Two points of the final welding process taking place in a special environment (carbon dioxide).

A typical line does not provide for a paint box, which is arranged separately. The productivity of the line is reduced to the production of 10 blocks within one hour of time, but also under the control of at least 10 people. The approximate cost of such a continuous production process in the assembled form comes down to no less than $100,000.

Workshops for the manufacture of metal structures

Workshop for the manufacture of metal structures

At the moment, the production of steel doors is carried out according to various technologies, but in fact all of them are endowed with common initial aspects. The main part of the processes of production technology should take place in separate rooms, therefore, the area must provide for the presence of the following workshops:

• Workshop where metal is received and raw materials are prepared;
• The workshop where processing takes place metal sheets and rental of profiles;
• Workshop where the welding and assembly process takes place (production line);
• Workshop for painting products;
• Finishing and decorative shop, provided that finishing material produced on site, not purchased from ready-made;
• Assembly control shop, where the blocks are completed with locks and other mechanisms;
• Warehouses for storage finished products.

Each of the workshops must meet special requirements regarding fire safety. So the premises should be finished (floors, walls), at least non-combustible materials, and be equipped with supply and exhaust ventilation.

Production and technological process of manufacturing steel blocks

The manufacture of iron doors in relation to technology provides for a certain sequence of production steps that are prescribed in specialized documentation (routing or technological map), where:

• Basic requirements for the initial quality of the material used;
• Rules for the transportation of raw materials and finished product, acceptance of material and storage of input blocks;
• The documentation of special requirements indicates a complex technical requirements for each stage of the process;
• Methods of quality control and control are prescribed;
• Many specifications(production specifications), which are compiled in accordance with the indications of GOST 31173-2003.

Main technological stages manufacturing of steel structures:

Preparation of raw materials.

On this stage metal material to be sorted. The labeling of sheets is verified, the presence of deformations is checked, which appear mainly after the process of transportation or rolling. At this stage, scale and corrosion are also removed from the material. Storage of rolled metal in warehouses should be carried out on racks or sheets are stacked in piles.

Marking and cutting blanks.

The production of doors starts with the correct cutting of metal sheets relative to the templates applied to the surface using scribers and center punches.

Processing of blanks and parts.

The profile of the door frame is created on the sheet bending equipment.

Blanks for future input blocks are sawn off to eliminate burrs and irregularities. So in the process the surface layer of steel is removed in the places of cutting. Sawing can be done manually using simple files, as well as on specialized filing machines.

The processed blanks are sent to a stamping machine, on which holes of various diameters are made in the details for the needs of installation on fittings and locking systems.

Assembly process and welding work

The door leaf is assembled using resistance welding. Typical welding technology eliminates deformation damage to the door leaves and ensures the complete elimination of welds on the surface.

Locking systems are installed on metal structures at the same time with the installation of stiffeners, in areas reinforced with metal plates. A kind of technological pockets are being created. At this stage, the canvases are insulated. Non-combustible soundproofing and insulating material is laid inside the canvases.

The hinges to the assembled product are often welded by hand.

Lacquer work.

After the assembly of the structure is completed, the block is painted. The compositions are applied exclusively on polished, cleaned, degreased surfaces. There are several ways to apply:

• Jet flow;
• Pneumatic spray;
• Spraying in an electrostatic field.

One of several paints in a variety of colors can be used for the process:

• Powder;
• Nitro;
• Hammer;
• Graphite.

Decorative finish designs.

Often metal doors are decorated protective coatings, molded, laminated finishing panels. Decorative finishing by production can be purchased ready-made. As a lining can be used:

• Leatherette, leather, vinyl leather;
• Lining made of wood;
• MDF panels, chipboard;
• natural wood;
• Thermal film with imitation of natural wood or plain;
• Elements of decorative forging;
• Natural wood veneer.

Installation of accessories, lock systems.

Often, the insertion of fittings is done manually. To avoid the characteristic metallic sounds emanating from the design of the input blocks, and for thermal insulation properties, the door leafs are pasted over with special shock-absorbing materials:

• Rubber seals;
• from rubber;
• Silicone seals.

Sections of the article:

On the market entrance doors steel structures rightfully occupy one of the leading positions. The manufacturing technology and the positive characteristics of the material make it possible to prevent unauthorized entry into the premises and withstand all illegal opening attempts by selecting door keys, destroying or deforming the door leaf. The range of finished products in specialized stores is quite extensive, however, making an iron door with your own hands is not only possible, but also accessible to virtually everyone. It is only important to have the desire and experience to work with a welding machine, as well as to strictly adhere to the sequence when working with materials and tools.

The main reasons for the manufacture of steel doors on their own include:

• Not standard sizes design, which should be the result;
• The embodiment of the exclusive idea of ​​the designer;
• Use of special materials;
• Opportunity to obtain a high quality product;
• Economic component.

A high-quality iron door has high protective properties, provides sufficient heat and sound insulation, and has a long service life.

Iron structure design

The process of manufacturing an iron door should begin with the creation of a drawing, which indicates the actual dimensions of the product. The resulting scheme will serve as the basis for the assembly and subsequent installation of the door.

You need to start by measuring the width and height of the doorway. The measurements obtained are transferred to paper, a diagram is drawn future design with the specified width and height of the door leaf.

The standard size of the metal structure is 900 mm x 2000 mm. If the dimensions are larger, then an additional block is installed on top, closed sheet metal, glass, grating, or a blind or hinged block is welded on the side. All elements are specified in the project.

The dimensions of the door frame should be 2 cm smaller than the size of the doorway. The resulting gap will subsequently greatly simplify the process of installing the box and allow you to adjust it if necessary.
The number of loops is calculated taking into account the weight of the structure, as a rule, 2 - 4 canopies are used. To evenly distribute the load, the hinges are welded at the same distance from each other. In this case, the first and last are welded at a distance of 15 cm from the outer edge of the door.

The next step is to reinforce the door frame with additional stiffeners. The main stiffener is located in the middle of the door leaf, and additional stiffeners can be put in from the corners of the product or from the hinges, which will evenly distribute the load over the entire door area. The main thing is that the stiffeners do not interfere with the insertion of the lock, the installation of the handle and the peephole. Stiffeners must provide strength finished product, their number is also chosen at your own discretion.

Materials and tool kit

To necessary tools to assemble an iron door with your own hands include:

• Electric drill;
• Screwdriver;
• Bulgarian, equipped with a cutting disc for metal;
• clamps;
• A set of files, a grinder;
• A set of measuring tools.



To materials for manufacturing standard design relate:

• Steel sheet (2 - 3 mm thick with a dimension of 100 x 200 cm);
• Metal corners for the frame (3.2 x 3.2 cm 6 p.m.);
• Profile pipe for the frame and stiffeners (5x 2.5 cm 9 p.m.);
• Canopies for doors;
• Reinforcement plates for fastening the door frame to the wall (40 x 4 cm, thickness of which is 2 - 3 mm, in the amount of 4 pcs.);
• Door fittings (locks, handles);
• Anti-corrosion protective compounds, dye;
• Mounting foam, anchor bolts.

The range of door fittings and locks is quite diverse, the choice depends solely on personal preferences. But the most popular mechanisms are locks with crossbars on three sides. Such products are mounted much more difficult, but also protective functions they are much higher.



If the iron door is intended for utility rooms, you can use a more simplified and low-cost financial plan option: the reinforcing bar will perform the function of the stiffener.

Assembly steps

The process of assembling a metal structure consists of the following steps.

collection box

Frame parts are cut from a profile pipe and laid in the form of a rectangle on the welding table. Once again, all dimensions are checked, including diagonally. The control measurement will allow you to set the angles clearly at 90 degrees. A correctly adjusted design is tack welded.



After completion of welding work, it is necessary to check the perpendicularity of the sides and measure the distance between opposite pairs of corners. Compare source data.

If everything worked out correctly, you can proceed to the final welding work. Upon completion, the seams must be sanded. Then reinforcing plates are welded to the door frame.



Door leaf assembly

To assemble the canvas, it is necessary to measure the inside of the door frame. On each side we retreat 7 cm - these are the dimensions of the future structure.

From metal corners workpieces are cut to length and pass pre-processing to remove burrs. The prepared corners must be laid inside the structure to form a rectangle. After that, control and measuring actions are performed.



If there are any nuances, they must be eliminated and fit all the details in size. Docking points are welded tightly.

The next step is to cut the material for the stiffeners, they are welded tightly to the door frame. It is important to take into account all the places indicated in the project for installing the lock and related fittings.


The appearance of the frame with welded stiffeners.

Fabrication begins with the laying of a steel sheet on welding table or goats. A finished frame is laid on top of the sheet and a contour is drawn according to the dimensions specified in the project, while 10 cm must be indented from the outer edges of the frame.



According to the outlined contour, a steel sheet is cut out, the cut sections must be polished. The prepared canvas is mounted to the frame using a welding machine.

An important point: in order to prevent distortion, welding cannot be done with a continuous seam.



The best option for a welding seam is 30 mm pieces with an intermediate distance of 15 - 20 mm. To avoid subsequent hidden defects, during operation, the product must periodically cool down, otherwise it may need to be repaired in the near future.

Finished with outer side doors, the canvas must be turned over, and the door frame should be laid on top.

For the convenience of fitting the box to the frame, you can use linings, the thickness of which is from 2 to 5 mm, they are laid around the entire perimeter of the structure. In the resulting space, a sealing tape will be installed in the future to improve the soundproofing qualities of the door.



When the door leaf is completely ready, special cuts are made for installation inner castle and a peephole, a hole is drilled under door handle. The edges of the holes must be sanded.
An important point: the size of the hole for the lock at the same time must allow the installation of the lock without play and provide Free access to it in case of repair work.

For padlock it is necessary to provide special overlays.

Installation of door hinges

The upper canopies, equipped with grooves, are attached to the door frame, and their lower parts with pins are welded to the door frame. Docking seams must be polished.



collected metal structure must first be cleaned of foreign particles (dust, chips) and treated with an anti-corrosion compound. The final chord is either tinting or decorative trim doors.

In order to understand in more detail and clearly how iron doors are assembled with your own hands, it is recommended that you first study the videos that clearly show the whole process from A to Z.

Assembly work on the installation of the door

A box is placed in the doorway and the structure is adjusted relative to the opening, all actions are carried out using a plumb line or building level.



Installation work on the installation of the door frame takes place exclusively with its geometrically verified location. Anchor bolts are used to fix the steel hinges to the wall. After that, you can hang the door leaf on the awnings.

Checking the correct installation: the iron door should both open and close freely, and the hinges should work smoothly and without undue effort.

Installing the lock and door handle

After installing the lock, the end sides of the crossbars must be rubbed with chalk and make marks on the door frame with them. In the marked places, holes are cut out - grooves for the crossbars.



If there is a need for additional protection of the lock, a corner of the required length should be welded to the door leaf in those areas where the crossbars come out. Another way is to strengthen the door leaf in the place where the lock is mounted. For this, with inside a steel plate 6 mm thick is welded. At this stage, it is recommended to adjust the operation of the locking mechanism and take care of the tight fit of the door to the frame.

Having studied detailed instructions manufacturing, you can understand how to properly make a metal structure. iron door with your own hands it is quite possible to assemble at home, most importantly, arm yourself necessary material and tool.

For apartment owners who have something of value, one day the question arises of strengthening their home. The most obvious and simple solution in such a situation, there will be a reliable door installation. There are a lot of varieties of metal entrance doors on sale and it is quite difficult to immediately navigate in all this diversity. What type of steel door to choose, how they differ - these questions will be answered in this article.

Characteristics of entrance metal doors

All metal doors, regardless of their class, are much stronger and safer than wooden ones. This truth is not disputed by anyone. But among themselves they differ in characteristics quite strongly.

• security - this means how long a metal door can resist attempts to crack it;
• comfort - in addition to protective properties, steel doors are also chosen for such qualities as excellent sound insulation and fire protection;
• reliability - this quality of any metal door is determined by its service life, ease of use and protection against breakage;
• aesthetics is another property in accordance with which the choice is made, because it will be in his house or apartment, which means it should be in harmony with the interior.

All of the above qualities are important when choosing a metal door. But very often one of them prevails over the others, and some is practically absent.

Properties of metal doors

All metal doors are made of high-strength and corrosion-proof materials. Basically, cold-rolled alloy steel is used in their production.

The internal design of the doors is very similar to each other in all classes. It is a door leaf, consisting of metal frame, which is made of iron corners, steel bent profile, the same profile pipes. Then flat steel sheets are welded to the finished frame, and the cavity between them is filled with various gasket materials. It can be foam rubber, foam plates, mineral wool or natural wood. Solid metal doors are rarely made, usually in cases where they are used to protect the safe room and such premises as a bank vault, cash desk, etc. These doors are called armored. The thickness of the metal used in steel doors varies.

Structure of a metal door

1 outer door trim; 2 steel sheet; 3 heat and soundproof material; 4 door frame made of metal profile; 5 steel sheet; 6 finishing the inside of the door leaf; 7 platband; 8 reinforced box made of steel profile; 9 peephole; 10 fittings; 11 loops; 12 blockers; 13 internal valve; 14 locks; 15 rubber seal; 16 anchors.

Hinges in steel doors are made using special technologies. They must meet the requirement to hold a large weight. The door frame is one of the largest parts, apart from the door leaf. The closing device in metal doors is located in a protective pocket, this is done in order to increase protection and increase reliability against some hacking methods. An obligatory part of a steel door are stiffening ribs that support the shape of the door and prevent it from deforming from impacts.

The basis of any metal door is a special profile and a sheet made of steel - these are structural elements responsible for strength and reliability. The seal used inside the door leaf is responsible for comfort and sound insulation. This component of the door also affects the retention of heat inside the apartment.

Basic installation steps

Tools needed when installing a metal door:

• measuring instruments (tape measure, level);
• a hammer;
• electric drill;
• a set of keys and a screwdriver.

The installation steps can be broken down into the following steps:

• preparation of the opening, which consists in removing interfering pieces of mortar and other debris;
• installation of a door in an opening that was prepared in advance;
• fixing the frame by level. To do this, you need wedges that are installed between the steel frame and the wall;
• then, using an electric drill-perforator, holes are made in the wall for anchor bolts;

• insert anchor bolts, and their fixation with nuts;
• filling with foam or a special solution of cracks between the frame and the wall;

• removal of the protective coating from the door leaf.

Classes of metal doors

According to the price criterion, the doors are divided into economy class - cheap, premium class - expensive and high quality, and elite - the most expensive and exclusive.

Economy class metal doors

The economy class includes metal doors, the main task of which is to protect a house or apartment, combined with a small price. They are distinguished by a simplified design and lower quality. The cost of such a metal door can also be reduced by saving on exterior finish. Most often, powder coating, inexpensive laminate and other cheap materials are used, but despite this, the door can look pretty decent.

Due to the observance of the technology of their production, this group of doors has good sound insulation, heat preservation and blocks the ingress unpleasant odors. Economy class Chinese metal doors are available for a wide range of consumers.

Premium metal doors

Premium class combines steel doors, characterized by such features: sophisticated design, high quality structural elements and a correspondingly high price. When finishing these doors, more than expensive materials- this is a high-quality lining, complex powder coating, expensive laminate. Premium steel doors wear less, provide more security and are well designed.

Elite metal doors

Elite doors are very expensive, as they are made from expensive materials. In their production, only high-quality locks and fittings from the best manufacturers. Excellent design, developed in accordance with the interior of the customer - these are the signs of the most expensive group of doors. These doors make the most of natural materials, expensive finish, additional armor pads. Elite doors are usually available only for wealthy people.

Separately in this list are doors made by non-professionals, the so-called "handicraft" way. They are sometimes offered by craftsmen. They are made in garages, using a welding machine and a circular saw. They are made of very thick and cheap metal, but do not contain seals and a layer that would increase sound insulation.

What to be guided by when choosing a metal door

When choosing a steel door for oneself, a person is guided by such indicators and factors as price, burglary resistance, durability, maintenance cost, external attractiveness, ease of use, heat resistance, sound and heat insulation. But the importance of these factors varies depending on where the door will be installed, and how much is available for its purchase.

Steel doors that suit a person for most characteristics may be too expensive. The reverse situation will lead to the acquisition of an unreliable metal door. All manufacturers claim that their metal doors are reliable and resistant to burglary. But in fact, the difference between the opening time of a metal door of an inexpensive and expensive category, which is necessary for a professional, is about 6 minutes. The simplest metal doors in this respect open in just a couple of minutes, and those considered impregnable - in 8. And the difference in price is from ten to twenty thousand rubles. So how do you make the right choice?

The best way to protect yourself from a thief is to install an apartment alarm in addition to the door.

It is from the response time of the employees of the security agency that one should start when choosing a door according to the criterion of resistance to breaking - it should be enough for the timely appearance of security.

If the main criterion is the appearance of the door, then it is best to focus on the interior and furnishings of your apartment and the harmony of the door with the facade of the building. In this case, the use of a combined cladding and a detailed study of the design will be in place. These services are now provided by many professional steel door manufacturing companies.

The official division of locks for metal doors into classes

The door lock is another important detail of the steel door design, which is characteristic of absolutely all types of doors. The classification of metal doors according to the degree of security provided depends on the installed lock. According to GOST 5089-97, which is called "Latches and Latches for Doors", four classes of locks are established by the state.

Let's consider them in more detail:

• the first class includes locking devices that have very low burglary resistance characteristics. It is believed that they do not present any obstacles to the commission of theft due to the low qualities of strength;

• locking mechanisms are suitable for the second class, in which security characteristics are at the usual level, and strength properties are below average. GOST set the time required to open such a lock without keys. It is about five minutes long;
• the third type of locks has the highest security qualities and the average strength of the materials included in them. The specified time for breaking them is ten minutes;
• the last variety is the fourth class. They have high protective properties, are made of especially durable materials and resist opening for about half an hour.

When determining the opening time, it meant the time of work of a high-class cracker with a special tool. To an ordinary person seldom even a second- or first-class lock can be broken.

Classification of doors by degree of security, by type of coating and by dimensions

Safety Classification

By analogy with the classes of locks, metal doors also differ. According to the properties of reliability and resistance to hacking, they can be divided into three categories:

• ordinary - locks of 3-4 classes and blocking devices and obstacles to removal are installed in them. These include metal entrance doors economy class;
• reinforced steel doors - also contain class 3-4 locks inside, equipped with interlocks that prevent them from being removed, the hinges of such doors are reinforced, and the perimeter is closed with multi-bolt locks. Most often, premium metal entrance doors have such protection;
• protective metal doors - have the properties of the previous types, but additionally prevent opening by pressing, squeezing and other similar moments.

Classification by type of coating

If we consider the classification of doors by type of coating, then they can be divided into the following groups.

Metal doors with transfer coating. It provides a more attractive appearance, being bright and aesthetic. Often this type of coating imitates others. Perfect for use in places protected from moisture and the sun.

The Teflon coating is black, which gives the door a strict and discreet look. This coating material is practically scratch-resistant and does not fade when exposed to ultraviolet light. Teflon is an excellent coating for doors that are installed in country houses and interact with the street.

Auto enamel coating. A special technology that helps to achieve a balance between quality and visual appeal. These doors can be installed in apartments and houses.

Hammer-transfer coating - on the one hand, such a door is faced with a hammer method, which makes it resistant to scratches, chips, etc. On the side of the dwelling, the coating is transfer, which allows you to choose it in accordance with the interior.

Dimensions and methods of opening metal doors

Door dimensions are also taken into account when classifying them. There are standard sizes and doors made to order.

According to the number of locks, metal doors are divided into one- and two-lock. Elite doors are usually made with two or more locks.

According to the method of opening, the doors are divided into right-handed and left-handed. There are doors that open 90 degrees, others can open 180.

What to look for when choosing metal doors

• On average, the size of the door frame is 2000x800 mm, which does not always correspond to the size of the doorway in a particular case. Therefore, the height and width of the opening are first measured, and only then the door is bought or (with a non-standard size) ordered;
• thermal insulation in the door leaf should be made of foam or mineral wool, and rubber seals should be installed around the perimeter. Often you can stumble upon the manufacturer's trick when he writes that the door has batting insulation on both sides. This means that under the skin on both sides there is a layer of batting only 5 mm thick, which is clearly not enough for heat and noise insulation;

• when buying cheap Chinese metal doors of economy class, only black color is included in the base price finishing coating. It should be borne in mind that you will have to pay extra for any other color;
• the quality of the door is also indicated by the locks installed on it. The most budget models are equipped with two types of locks - the upper lever and the lower brown mosrentgen. At the same time, more expensive and presentable models are always placed on the advertising photo. Both of these locks are very popular due to their low price, but they do not provide the necessary burglary protection;
• the next thing you need to pay attention to is the thickness of the door frame, on which the heat and sound insulation of an apartment or house also depends. It can be standard from one profile pipe 5x2.5 cm or reinforced with a thickness of 7.5 cm.

The cost of metal doors

As mentioned above, the difference in price between the classes of entrance doors is very significant. But with the right choice, you can buy a durable and secure door even for little money.

Economy class metal door price

But if there is a desire to buy not just a reliable, but also an exclusive and luxurious thing, then you should stop at the elite doors.

Economy class technical metal doors are used for industrial and warehouse premises.

Metal doors are made different technologies, albeit on the same principle. And you need to figure it out. Only in this case, you can choose the optimal model, not focusing only on the advice of consultants in stores. Here is the basic information about the production of doors. Information and samples for the article were provided by the company for the production of steel doors "T-Stal".

Equipment and materials

Sheet steel, profiles or corners are used as materials. different sizes and thickness, a set of accessories (door fittings: hinges, handles, locks, eyes, etc.). The quality of a door depends both on the strength and thickness of the steel, and on the quality of the fittings (first of all, locking mechanisms).

Materials are processed on equipment of various types:

• Automated. Such equipment is used by enterprises that produce more than 200 doors per shift.
• semi-automatic. These are cutting machines welders, sheet bending presses, painting booths. In semi-automatic production, the reject rate is lower, but the productivity is also lower - up to 17-20 products on one line.
• Mechanical. This is a set hand tool: grinder, turning and milling machines, special guillotine, etc. Such equipment is rarely used. In enterprises, semi-automatic machines are more often preferred.

Automated lines allow you to produce more products per day, thereby reducing its cost. However, the percentage of defects in such enterprises is high, and with inadequate quality control, the buyer may reveal defects.

Production process

Conventionally, the production of metal doors can be divided into four stages.

1. At the first stage, a box and a canvas are made. The box is the outer part of the product, which is subsequently inserted into the doorway, and on which the canvas itself is hung. They make it from the corner. The corners are welded or bent. The leaf is that part of the door in which the lock is installed, and which performs protective functions. It is made in this way: a frame is created from a corner (stiffening ribs can be used), then a sheet of steel is welded to the frame on one or both sides.
2. At the second stage, hinges are installed on the box and the canvas, carefully checking the mounting points. Holes are made in the canvas and corners for fittings and a lock.
3. At the third stage, the product goes to the spray booth, where it is processed. Processing is needed for any metal doors, regardless of what finish will be used in the future.
4. At the fourth stage, fittings are installed and the canvas is trimmed from the inside and outside. During the finishing process, the door can be insulated and seals installed.

The finished product is packed and sent to the warehouse, and then for sale.

Doors are made to order in approximately the same way, however, the dimensions and sketch of the customer are used here.

How to choose a door

Appearance, the brand of the door and fittings, the number of locks - that's not all you need to pay attention to. Be sure to check out:

1. How thick was the steel used for the door leaf. Too thin canvas will break through even with a knife, and too thick will make the door heavy.
2. What is the thickness of the steel in the corners that were used for the frame and box. The strength of the structure depends on this.
3. Were seals used, and was there any insulation. A door without these elements will freeze through in winter and let in sounds. You can’t put it in an apartment or in a private house.

As you can see, it is enough to know the basics of door production technology in order to choose the right model.