Hardware stamping parts have penetrated into various fields and are closely related to our lives. The usage rate of sofas in every family in the world is extremely high. Almost every family must have a sofa, whether it is a high-end cowhide sofa or a general wooden sofa.

So what are the technical requirements for metal stamping of metal sofas? The following summarizes the main factors affecting stamping processing, sheet materials, molds, equipment and stamping oil.

1. Raw material properties of hardware stamping parts
- Chemical analysis and inspection
Analyze the content of chemical elements in the material, determine the grain size level and uniformity of the material, evaluate the level of free cementite, banded structure and non-metallic inclusions in the material, and check the defects of shrinkage, looseness and so on.
- Material inspection
The material of sofa leg stamping parts is mainly hot-rolled or cold-rolled metal sheet and strip materials. The raw materials of sofa leg hardware stamping parts should have quality certificates, which ensure that the materials meet the specified technical requirements. When there is no quality certificate or for other reasons, the sofa leg hardware stamping parts factory can select raw materials for re-inspection as needed.
- Forming performance test
Bending test and cupping test are carried out on the material to determine the work hardening index and plastic strain ratio of the material. In addition, the test method of steel plate forming performance can be carried out according to the provisions of thin steel plate forming performance and test methods.
- Hardness test
The hardness test of sofa leg metal stamping parts adopts Rockwell hardness tester. Small stamping parts with complex shapes can be tested with other testing instruments.

2. Process requirements of sofa leg metal stamping parts
- When designing the structural shape of the parts of sofa leg metal stamping parts, simple and reasonable surfaces and their combinations are used. At the same time, the number of processed surfaces and the processing area should be minimized as much as possible.
- Choose a reasonable method for preparing blanks in mechanical manufacturing, which can directly use profiles, casting, forging, stamping and welding. The selection of blanks is related to specific production technical conditions, and generally depends on production batches, material properties and processing possibilities.
- Requirements for the forming performance of sofa leg metal stamping. In order to facilitate stamping deformation and improve the quality of parts, the material should have good plasticity, small yield strength ratio, large plate thickness directional coefficient, small plate plane directional coefficient, and small ratio of yield strength to elastic modulus. The separation process does not require the material to have good plasticity, but it does require materials with certain plasticity.
- Specify appropriate manufacturing accuracy and surface roughness. The cost of sofa leg metal stamping parts will increase with the improvement of accuracy, especially in the case of high accuracy, this increase is extremely significant. Therefore, high accuracy should not be pursued without sufficient basis. Similarly, the surface roughness of metal stamping parts should also be appropriately specified according to the actual needs of the matching surface.

3. Selection principles of sofa leg metal stamping oil
- Silicon steel plate: Silicon steel plate is a material that is relatively easy to punch. Generally, for the easy cleaning of the finished workpiece, low-viscosity stamping oil will be selected on the premise of preventing punching burrs.
- Carbon steel plate: Carbon steel plate is mainly used for low-precision processing such as protective plates of some mechanical equipment with low process requirements, so the first thing to pay attention to when selecting stamping oil is the viscosity of the stretching oil.
- Galvanized steel plate: Galvanized steel plate is a welded steel plate with a hot-dip or electroplated zinc layer on the surface. Because it will react chemically with chlorine additives, when selecting stamping oil, attention should be paid to the problem of white rust in chlorine-type stamping oil.
- Copper and aluminum alloy plates: Because copper and aluminum have good ductility, when selecting stamping oil, you can choose stamping oil containing oiliness agent and good sliding property, and avoid using stamping oil containing chlorine-type additives, otherwise the stamping oil will corrode and cause discoloration on the surface.
- Stainless steel: Stainless steel is a material that is easy to produce work hardening, and requires the use of stretching oil with high oil film strength and good sintering resistance. Generally, stamping oil containing sulfur-chlorine composite additives is used to ensure extreme pressure processing performance while avoiding burrs, cracks and other problems on the workpiece.
 

What are the technical requirements for the hardware stamping process of sofa legs? The above is a detailed introduction. The processing technology of sofa leg metal stamping parts is relatively complicated. In order to ensure that the performance of metal stamping parts can meet the use requirements, it is necessary to follow the corresponding process requirements to ensure production feasibility.