The backward situation of hardware accessories for doors, windows and curtain walls has existed for many years. This is mainly due to the insufficient understanding of the importance of accessories, which is reflected in:

1. Do not pay attention to the decoration of hardware accessories

Hardware accessories are an integral part of the door and window curtain wall, and the beauty of the appearance is an important part of the door and window curtain wall. Some people think that the hardware fittings can be used, and the aesthetic requirements are poor. The common low-cost crescent locks are more common, and the upper and lower latch type window locks are more. The requirements for surface decoration of hardware are very low, which is a factor affecting development.

2. Insufficient understanding of use functionality

my country's door and window hardware accessories R&D and design companies are few, and they are accustomed to plagiarism. Some brand door and window companies use imported hardware accessories for most of their important projects. Foreign companies specialize in researching various types of hardware accessories. Therefore, hardware accessories of different varieties and performances are endless. Our locks generally have two locking points. Foreign production multi-point locks are divided into three-point, four-point and six-point locks. Hardware accessories can improve the function of doors and windows, and can make hardware accessories that slide folding doors like cars. Only high-end multifunctional accessories can have multifunctional doors and windows.

Foshan hardware accessories

3. Insufficient understanding of the safety of hardware accessories

There was a category 15 typhoon, tens of thousands of trees, telephone poles, and tower cranes were blown down, more than 20 glass curtain walls and aluminum windows were not blown down, and many door and window sashes were blown off because of weak hardware fittings. There are multi-point locks with bolts on all sides of the door and window sashes, which are not blown off. Because the lack of attention to hardware accessories reduces the firmness and safety of doors and windows and curtain walls, directly affects the quality of doors and windows and curtain walls, and brings hidden dangers to personal safety, so we must pay attention to the safety of hardware accessories.

4. Insufficient understanding of the benefits of hardware accessories for doors, windows and curtain walls

Why is no one to develop hardware accessories for doors, windows and curtain walls? Some people think that hardware accessories are too profitable to be worth investment. Moreover, too little investment makes hardware difficult to do. Therefore, there has been no big investment for many years, and the situation of hardware accessories depends on foreign countries. Come down. For hardware accessories, the profit of low-grade hardware is not high, but the profit of high-grade hardware is not thin. Industry insiders have studied that the profit of foreign hardware accessories accounts for 20% to 30% of foreign costs (excluding import taxes). To be high. More importantly, don’t forget that China is a big country. Our country needs an astonishingly large amount a year. It has a huge market and hardware accessories of the same grade and the same level. The cost is much lower than that of foreign countries. The overall economic and social benefits are very considerable and worthy of doors and windows. The curtain wall industry digs deep into the business opportunities.

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In order to better use stainless steel hardware accessories and stainless steel columns, when we install, we need to carry out reasonable installation according to regulations, or when installing, we need to pay attention to the operation matters, which are the key points. If the installation is unreasonable, it will indirectly lead to The stainless steel column cannot be used normally, and the stainless steel column is even damaged.

 

1. Installation and primary treatment should meet the following requirements:

 

(1) The design elevation, position and quantity of embedded parts must meet the design and installation requirements, and be treated with corrosion and rust prevention. When the embedded parts do not meet the requirements, effective measures should be taken in time to supplement the embedded parts.

 

(2) At the location where the stair railing column is installed, the base concrete must not be loose, and the installation elevation should meet the design requirements, the unevenness must be removed or repaired, and the concave and the base honeycomb pitted surface must not be repaired with cement mortar. , The use of high-strength concrete for repair, and after a certain strength, the railing can be installed.

 

2. According to the design and installation requirements, the installation spacing position and center line of the railing posts are correctly popped up.

 

3.Main points of installation and operation of stainless steel stair railings and handrails:

Stainless steel column price

(1) The installation of the railing post should be carried out according to the requirements and the order of the construction ink line upwards from the starting point. The columns at both ends of the platform at the start of the stairs should be installed first. The installation can be divided into welding and bolting. During welding construction, the welding rod should be made of the same material as the base material. During installation, the column and the embedded part should be temporarily fixed by spot welding. After the elevation and vertical correction, the welding should be firm. When bolting is used, the holes on the metal plate at the bottom of the column should be processed into round holes to prevent the position of the expansion bolts from being inconsistent. Minor adjustments can be made during installation. During construction, at the base of the installation column, use an electric drill to drill the expansion bolts, connect the column and fix it slightly. If there is an error in the installation elevation, adjust it with a metal thin gasket, and tighten the nut after vertical and elevation correction. After the two ends of the uprights are installed, use the same method to install the remaining uprights. The upright installation must be firm and not loose. Column welding and bolt connection parts, except stainless steel, should be treated with anti-corrosion and anti-rust treatment after installation, and should not be exposed, and a decorative cover or cover should be installed at the root.

 

(2) Inlaid with machine glass, glass and other fences, the fences should be installed after the column is completed. The installation must be firm, and the vertical, horizontal and inclination should meet the design requirements. When installing, insert the railing into the grooves of the vertical poles on both sides. The gap between the groove and the two sides of the railing should be filled firmly with hard rubber strips. After the handrails are installed, they should be embedded with sealant. When the handrails are welded and installed, the fence should be covered with fireproof asbestos cloth to prevent damage to the fence due to welding sparks.

 

(3) The installation of stair handrails generally adopts welding installation (except for special sizes). The material of the welding rod used in the processing of hardware accessories should be the same as the base material. The installation sequence of the handrails should start from the starting elbow, followed by the straight handrails. The armrest interface should be cut correctly according to the required angle and filed with a metal file to avoid inaccurate cutting, causing the armrest to bend and difficult to install. When installing, first fix the starting point elbow and the railing post by spot welding, and weld it firmly after the inspection is correct. After the elbow is installed, the two ends of the straight handrail are temporarily fixed by spot welding to the two ends of the column, and at the same time, one end of the straight handrail is butt-connected and fixed by spot welding. There should be a 2-3mm welding gap at the handrail interface, and then pull the line to connect the handrail It is fixed by spot welding with each column. After the inspection meets the requirements, according to the welding requirements, the interface and the handrail and the column are welded firmly. When welding (especially in winter construction), the welding current, voltage and welding temperature should be mastered to prevent the current from being too large or too small and the voltage is unstable, which affects the quality and appearance of the welding. The welding quality should meet the relevant standards, the width and depth of the weld should be consistent, the surface should be fish-scale, the weld of the handrail joint should be tight, and the weld should have no obvious feel deviation.

 

(4) After the installation of long metal handrails (especially outdoor handrails), its joints should be considered to install movable interfaces that can adapt to temperature changes and expand and contract. The expansion and contraction of movable joints, if there is no design requirement, generally consider 20mm. Outdoor handrails should also consider setting leaking holes at the retractable place. The connection between the root of the handrail and the surface of the concrete and brick wall should generally adopt a retractable fixing method to avoid bending and deformation of the handrail due to expansion and contraction. A decorative cover should be installed at the root of the connection between the armrest and the wall.

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Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature. Iron castings are brittle and are prone to pores during the casting process. Under long-term vibration and impact, stress concentration is likely to cause the shell to crack.

cast iron

Classification
Category Name
Description
press
Break
mouth
Yan
color
grey cast iron
Most or all of the carbon in the cast iron exists in the form of free-state flake graphite, and its fracture is dark gray, with certain mechanical properties and good cutting performance.
White cast iron
White cast iron is an iron-carbon alloy with no or almost no graphite in the structure. Its fracture surface is bright white, hard and brittle, and cannot be cut. It is rarely used directly in industry to make mechanical parts. Because of its high surface hardness and wear resistance, it is also called chilled cast iron or chilled cast iron
Hemp cast iron
Pitched cast iron is a kind of cast iron between white cast iron and gray cast iron. Its fracture is gray and white pitted. It has poor performance and is rarely used.
press
Transform
learn
to make
Minute
Ordinary cast iron
Refers to cast iron that does not contain any alloying elements, such as gray cast iron, malleable cast iron, ductile cast iron, etc.
Alloy cast iron
It is a high-grade cast iron prepared by adding some alloying elements to ordinary cast iron to improve some special properties. Such as various cast irons with special properties of corrosion resistance, heat resistance and wear resistance
press
Give birth
Produce
square
law
with
Organizational performance score
Ordinary gray cast iron
Most or all of the carbon in this cast iron exists in the form of free-state flake graphite, and its fracture is dark gray, with certain mechanical properties and good machinability, and is widely used in industry
Inoculated cast iron
This is based on gray cast iron, using "modification treatment", also known as modified cast iron. Its strength, plasticity and toughness are much better than general gray cast iron, and its structure is more uniform. Mainly used to manufacture large castings with high mechanical performance requirements and large changes in cross-sectional dimensions
Malleable cast iron
Malleable cast iron is made of white cast iron with a certain composition after graphitization and annealing. It has higher toughness than gray cast iron and is also called ductile cast iron. It cannot be forged, it is often used to make castings that bear impact loads
Nodular cast iron
Referred to as ductile iron. It is obtained by adding a certain amount of spheroidizing agent and inking agent to the molten iron before casting to promote the crystallization of spherical graphite. Compared with steel, it has similar properties except for slightly lower plasticity and toughness. It is an excellent material with the advantages of steel and cast iron, and is widely used in mechanical engineering.
Special performance cast iron
This is a kind of cast iron with certain characteristics. According to different uses, it can be divided into wear-resistant cast iron, heat-resistant cast iron, and corrosion-resistant cast iron. Most of them belong to alloy cast iron, which is widely used in mechanical manufacturing
cast iron

Due to the poor weldability of cast iron and the high sealing requirements of hydraulic equipment, the traditional welding repair process cannot be repaired at all. However, there are generally no spare parts for such equipment on site, and a lot of downtime is required to purchase and replace.

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The content of the casting process design includes: the design of the casting process drawing, the design of the casting drawing, the design of the mold assembly drawing and the production of process cards, etc. What are the advantages of precision casting processing?

　　 1. Castings have high dimensional accuracy, the general linear tolerance is 1%, the angle tolerance is: ±1/2 degrees, and the surface is smooth

　　 The degree can reach Ra1.6-3.2, which can save material and machining costs.

　　2. It can produce parts with complex shapes, or cast multiple parts into one, eliminating the need for assembly or welding.

　　3. Exquisite text or LOGO patterns can be cast on the surface of the product to enhance the product image.

　　4. The casting material has a wide range of properties, heat resistance, wear resistance, corrosion resistance, and the material hardness can reach HRC15-60,

　　 To meet the needs of various working conditions.

　　5. Casting production batch. Flexible volume, from small to large batch production, high efficiency and good repeatability;

　　 The mold cost is low, and the initial investment in product development is small.

 

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Processing more complicated parts, and has a certain degree of flexibility and versatility. However, the machining accuracy of parts is affected by the manufacturing accuracy of cams and masters, and the process preparation time is also very long.

　　 1. When we use a lathe to process parts, we usually need to control various actions of the machine tool, one is the sequence of control actions, and the other is to control the displacement of each moving part of the machine tool.

　　2. When changing the processing object, you only need to rewrite the program code and input it to the machine tool, and the CNC device can replace most of the functions of the human brain and hands, control the whole process of processing, and manufacture arbitrarily complex parts.

3. When using CNC lathes to process parts, you only need to compile the part graphics, process parameters, and processing steps in the form of digital information into program codes and input them into the machine tool control system, and then convert them to drive servo mechanism after calculation In order to control the coordinated actions of various parts of the machine tool, the parts can be processed automatically.

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Cast aluminum is a process in which aluminum in a molten state is poured into a mold and cooled to form an aluminum part of the required shape. Castings obtained by casting aluminum are called aluminum castings. The aluminum used in cast aluminum is called: cast aluminum alloy.
In the process of casting aluminum castings, it is easy to produce defects such as internal porosity, shrinkage holes, pores, etc. After these defective castings are machined, the surface dense layer components are removed and the internal structural defects are exposed. For automotive cast aluminum parts with sealing requirements, such as cylinder blocks, cylinder heads, intake manifolds, brake valve bodies, etc., when conducting pressure sealing tests, the existence of defective micropores will cause a large amount of leakage of the sealing medium. Waste products, and these defects are often found only after machining and pressure testing, resulting in serious waste of working hours, raw materials and energy.

In order to solve the problem of high scrap rate of automobile aluminum castings and save the castings that may be scrapped due to the above-mentioned defects, certain treatment measures must be taken in the production. The most common technique used is impregnation treatment, that is, leak plugging. The so-called "impregnation" is to infiltrate the infiltrant into the micropores of aluminum castings under certain conditions. After solidification, the filler that penetrates into the pores is connected to the inner wall of the casting pores to block the micropores and make the parts Process technology that meets the conditions of pressurization, anti-seepage and anti-leakage.

Aluminum castings have low cost, good manufacturability, remelting and regeneration to save resources and energy, so the application and development of this material are enduring. Such as research and development of cupola-electric furnace double smelting technology and equipment; extensive use of advanced molten iron desulfurization and filtration technology; thin-wall high-strength iron casting manufacturing technology; cast iron composite material manufacturing technology; cast iron surface or local strengthening technology; isothermal Yanghuo nodular cast iron complete set of technology; using metal mold casting, metal mold sand-coated casting, continuous casting and other special processes and equipment.　As a result of its low density, high specific strength, and corrosion resistance, cast light alloys will be widely used in aviation, aerospace, automotive, machinery and other industries.

Especially in the automobile industry, in order to reduce fuel consumption and improve energy efficiency, it is a long-term development trend to replace steel and iron castings with aluminum and nickel alloy castings. Among them, it focuses on solving pollution-free, high-efficiency, easy-to-operate refining technology, metamorphism technology, grain refinement technology and rapid detection technology in front of the furnace.

In order to further improve the performance of the material and maximize the potential of the material, high-quality aluminum alloy materials, especially aluminum-based composite materials, can be developed to meet the performance requirements of different working conditions; strengthen the research of the cluster alloy melting process, and continue the alloy die casting and squeeze casting Process and related technology development research; perfect ferroalloy smelting equipment and related technology and process development research.

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