Stamped parts are parts with certain shape, size and performance obtained by stamping process.  Stamping parts are widely used and gradually become an important part in the current parts manufacturing industry. The stamping process is affected by three factors: equipment type, workpiece material and oil product performance. Yixin Precision Metal and Plastic Ltd briefly introduces the performance requirements of raw materials for stamping hardware:
1. Properties of Stamping Materials
(1) element composition
Analyze the content of chemical elements in the material, determine the grade and uniformity of grain size of the material, the grade of free cementite and nonmetallic inclusions in the material, and check the defects such as shrinkage cavity and porosity of the material.
(2) material inspection
Stamping parts are mainly made of hot-rolled or cold-rolled metal plates and strips to ensure that the materials meet the specified requirements.
(3) formability
The bending test and cupping test shall be carried out on the material, and the hardening index and strain ratio of the material shall be determined. In addition, the test method for the formability of steel plate may be carried out according to the provisions of the formability of thin steel plate and the test method.
(4) hardness testing
Hardness testing of metal stamping parts adopts Rockwell Hardness Meter. Small stamping parts with complex shapes can be tested by other testing instruments.
2.the choice of stamping materials
There are three main stamping processes: blanking, bending and stretching. Different processes have different requirements for plates. Material selection should also consider the selection of plates according to the general shape and process of products.
(1) Blanking requires that the plate should have sufficient deformation to ensure that the plate will not crack during blanking. Soft materials have good blanking performance, and after blanking, parts with smooth section and small inclination can be obtained. The quality of hard materials after blanking is not good and the cross section is uneven, especially for thick plates.  For brittle materials, tearing is easy to occur after blanking, especially when the width is very small.
(2) The plate to be bent should have sufficient deformation and low yield limit. The plate with high deformation is not easy to crack when bending. The plate with lower yield limit and lower elastic modulus has small springback deformation after bending and is easy to obtain accurate bending shape. Materials with higher brittleness must have larger relative bending radius when bending, otherwise cracking will easily occur during bending.
(3) Sheet stretching, especially deep stretching, is a difficult kind of stamping process. It requires not only the minimum depth of stretching, the simplest shape and smooth transition as possible, but also a good amount of deformation of the material. Otherwise, it is very easy to cause distortion and deformation of parts as a whole, local wrinkling and even tensile cracking of stretching parts.
3. Selection of Stamping Oil
Stamping oil plays a key role in stamping process. Good cooling performance and extreme pressure anti-wear performance have made a qualitative leap in improving the service life of dies and workpiece precision. According to the different material of the workpiece, the emphasis of the stamping oil performance is different when it is selected.
(1) Silicon steel plate is a relatively easy punching material. Generally, low viscosity punching oil is selected on the premise of preventing punching burrs for workpiece cleaning.
(2) When selecting stamping oil for carbon steel plate, the better viscosity shall be determined according to the process difficulty, drawing oil feeding method and degreasing.
(3) Galvanized steel plate will have chemical reaction with chlorine additives. Therefore, when selecting stamping oil for galvanized steel plate, attention should be paid to the problem that chlorine stamping oil may cause white rust.
(4) Stainless steel plates are easily hardened materials, requiring the use of drawing oil with high oil film strength and sintering resistance. Generally, stamping oil containing sulfur and chlorine compound additives is used to ensure extreme pressure performance while avoiding problems such as burrs and cracks on workpieces.
These are the factors that affect the quality of stamping parts. With the rapid development of precision stamping technology, small stamping parts can meet the needs of various types of machine tools, electrical appliances, instruments and other manufacturing industries.
The above is the answer to the question about the performance of stamping materials. If you need to know more, you can visit our website or contact us for inquiries.
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