Stainless Steel Sheet Deep Drawing Characteristics and Tumor

stainless steel sheet deep drawing characteristics and tumor
Due to the high yield point stainless steel, high hardness, cold work hardening effect significantly, stainless steel sheet during deep drawing its characteristics as follows:
1) due to the poor thermal conductivity than normal low carbon steel, lead to the deformation force;
2) stainless steel sheet deep drawing, the severe plastic deformation hardening, wrinkle easily when the sheet deep drawing, need larger blank-holder force;
3) sheet metal deep drawing die in the rounded corners of bending and reverse bending springback, caused by deformation are usually formed in the product wall sag to demand higher dimensional accuracy and shape products need to increase the plastic process to achieve.
4) stainless steel sheet deep drawing process prone to caking phenomenon.
2 solutions.
2.1 working parts of die material selection and heat treatment
The practice proved: choose hard cast aluminum bronze, aluminum bronze anti-sticking effect is better; Manufactured carbonized tungsten steel bond hard alloy die than use Cr12Mov soft nitriding manufacturing the die life several times, and not sticky mode; If the code 3054 alloy cast iron, in the mold surface of flame quenching, the mold surface will not be binding. Also can be used in the mold damageable parts carbide edge, it has excellent compressive performance and superior wear resistance and lasting affection degree of surface roughness and size control. But due to the price, the production with less.
Restricted by plant material, if the general high carbon and high chromium steel used for stainless steel sheet deep drawing mould, heat treatment should reach more than 60 HRC hardness, surface soft nitriding process can be performed. Such as to improve the die wear and improve to hardness for deep drawing of stainless steel binding phenomenon will not improve. The key is to should as far as possible to remove residual austenite in the heat treatment, such as Cr12 common strain, fire technology on high hardness materials, even reach the extreme hardness range of HRC62-64, in the organization is still remaining a considerable amount of austenite. Soft point in the austenite is mould, compared with the martensite and lubricant of surfactant in the weaker affinity, is not easy to establish the lubricating film. So this kind of material heat treatment of low temperature processing can be used in strain, fire after cooling, the residual austenite into martensite and thus improve the resistance to adhesive matrix. In addition, still should make surface treatment for the stainless steel deep drawing mould to improve mould wear resistance, resistance to adhesive. For alloy cast iron and nonferrous alloy materials made of die surface strengthening technology, such as imposing nitriding use effect is good.
2.2 the surface of the mould work part machining
Low surface roughness can play the role of anti-friction and improve adhesion resistance accordingly. Cast in the whole process of mould processing, grinding amount shall be accounted for a third, because of the appearance of the stainless steel product quality depends largely on the mould cast grinding technology. In recent years, domestic appeared a new technology of polishing and polishing tools, developed ultrasonic, electrolytic polishing and abrasive jet, extrusion honing and other new technology, new equipment. , according to data of CrWMo, 3 cr12w8v, three kinds of Cr12 material mould of electrochemical polishing experiments, prove that the polishing in only 5 to 10 minutes to make the mold cavity surface roughness from the original on the basis of Ra3.2 - Ra1.6 down to Ra0.4 - RaO. 2. Through electrochemical polishing at the same time also can improve the surface hardness in order to improve the wear resistance. As another example, ultrasonic polishing machine can be used for the soft nitriding processing cavity fine polishing, it can avoid the shortcoming of manual polishing easy to destroy the nitride film. We should actively to use of a new polishing technology and summarized.

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