The main performance requirements of cold work die materials
Cold work die in the main tensile, compression, bending, impact, fatigue, friction and other mechanical effects, there will be brittle fracture, upsetting, wear, bite, bite damage, softening and so on, Certain fracture resistance, deformation resistance, wear resistance, fatigue resistance and anti-bite ability.
1.1 deformation resistance
The main indicators to measure the material deformation resistance are: hardness, compressive strength, tensile strength, bending strength.
Hardness is a measure of the hardness of cold mold material deformation resistance of the main indicators of hardness at room temperature is generally maintained at about 60HRC. For the same hardness and composition of different steel grades, the plastic deformation resistance can be significantly different. In the same hardness of different cold work die steel deformation resistance shown in there are significant differences.
2 compressive strength is characterized by its test method is closest to the actual working conditions of the punch, so the measured performance data and the punch in the work of the deformation resistance is more consistent.
3 Bending strength The advantage of bending test is easy to test, the absolute value of the strain is large, can reflect the difference between the deformation resistance of different steel grades under different heat treatment conditions.
1.2 fracture resistance
A one-time brittle fracture resistance can characterize one-time brittle fracture resistance indicators: a shock fracture work, compressive strength and flexural strength.
2 Fatigue fracture resistance The main indicators are: small energy multiple impact fracture work or repeated impact fracture life; tension-compression fatigue strength or fatigue life; contact fatigue strength or contact fatigue life.
1.3 wear resistance
Wear resistance is one of the basic performance indicators cold-working die steel. The relative wear resistance index can be measured by the simulation test method, as a parameter to characterize the wear resistance of different chemical compositions and the state of the tissue.
1.4 bite resistance
Parts forming, the mold surface due to the intermetallic atoms diffuse or unidirectional diffusion of the role, often there will be some metal adhesion, especially cutting cutting tool box surface stamping tools will have adhesion or scarring Cold welding phenomenon, which will affect the sharp edge of the edge and the local organization and cause changes in the local chemical composition, so that the edge of the crack or die due to the adhesion of metal scratches, so that the rough surface.
Bite resistance is actually the occurrence of "cold welding" resistance. In the test, the higher the critical occlusion load, the stronger the bite resistance.
1.5 heat softening resistance
Heat softening resistance reflects the cold work die steel temperature load on the hardness, deformation resistance and wear resistance. There are two main indexes to characterize the resistance to heat softening of cold work die steel: softening temperature (℃) and secondary hardening hardness (HRC). The former reflects the steel in conventional heat treatment to maintain the mold work hard to allow the limit temperature rise, the latter reflects the steel after heat treatment can accept the surface strengthening treatment.
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