Drawing die material selection and heat treatment requirements
A variety of sheet for drawing die material
Mainly due to the failure of the deep drawing die adhesion wear and abrasive wear, and adhesive wear-based. Therefore, the choice of mold material must have high wear resistance and anti-adhesion properties, and sufficient strength. Selection should also be considered when the material is drawing sheet thickness, drawing the size and shape of the production batch size and other factors.
(A) mold material for light drawing (drawing of thin steel sheets and copper and aluminum alloy)
When the production batch is small, T8 and T10 steel are optional for shallow shallow-drawn parts of simple shape, and CrWMn and 9Mn2V are used for small and medium-sized parts with complex shapes.
In the production of large quantities or larger, the choice of Cr12MoV.
Production volume is large, the choice of carbide or steel hard alloy.
(B) heavy-duty drawing (deep-drawn steel, anti-deep, thin deep drawing) when the mold material
Production of small quantities, the optional T10, CrWMn.
Large production volume, the choice of Cr12MoV and GM steel. The strength and toughness of GM steel are higher than those of high-speed steel and Cr12MoV. The anti-adhesion wear and abrasive wear resistance are obviously better than those of base steel and Cr12MoV. They have been well used in drawing dies.
Production volume is large, consider the choice of cemented carbide or steel cemented carbide.
(C) drawing of stainless steel, high nickel alloy steel, heat-resistant steel mold material
Deep drawing of such materials, prone to adhesion and nap, the preferred mold material is aluminum bronze.
Production of small quantities, the choice of aluminum bronze, T10A (hard chrome plated, pay attention to the hard chrome plated coating can not be too thick, to prevent peeling deep drawing).
Large production volume, the choice of aluminum bronze, Cr12MoV, Cr12Mo1V1 (surface nitriding).
Production of large quantities, the choice of cemented carbide.
(D) large-scale parts, automotive parts of the deep drawing mold material
You can use alloy cast iron or high-strength ductile iron. Ductile iron can be immersed in lubricating oil, graphite in the organization has a self-lubricating effect, can effectively reduce the friction in the drawing, and lower cost, easy processing.
High-ductile ductile iron can be dual-media delayed cooling martensitic isothermal quenching to obtain high strength and toughness, hardness of 55 ~ 58 HRC. The mold is slowly preheated and then heated to 880-900 ° C. After the air is cooled, the air is precooled, and then the brine is quenched to about 550 ° C to turn into oil cooling. When the mold temperature is reduced to about 250 ° C, ℃ hot oil in the warm for 2 to 3 hours, then the oil temperature was lowered to about 170 ℃ isothermal 5 to 7 hours, and finally transferred to air-cooled.
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