Die with life and
Countermeasures of 2th
China precision machining The impact of cold stamping
materials, cold stamping materials selected should meet the design requirements
of workpieces and stamping process requirements, or easy to mold damage and
reduce mold life. Poor surface quality of cold stamping, punching, cracking
when the workpiece is also easy to scratch mold. Bad cold stamping plastic
materials, deformation is small, easy to press when the workpiece rupture, but
also easy to scratch mold. In addition, the material thickness tolerances shall
comply with national standards. Die because of a certain thickness of material
suitable for forming, bending, flanging, drawing die of the male and female die
structure gap is directly determined by the thickness of the material. China precision machining Therefore, uneven thickness, will result in waste generation and mold damage.
2.
Die Die Life of
Die
Die Life of a mold material properties, chemical composition, structure,
hardness and comprehensive reflection of metallurgical quality. Among them, the
material properties and heat treatment affect the quality of the most obvious.
Mold material properties on the impact of die life is great. If the same
workpiece, using a different mold material of the bending test, the test
results: The 9Mn2V material, the life of 5 million; with Crl2MoV nitriding, the
life of up to 40 million. Therefore, the choice of materials, the batch size
should be based on workpiece, rational use of mold materials. The hardness of
the die parts to Die Life a great impact. But not the higher hardness, longer
die life. This is because the hardness and strength, toughness and abrasion
resistance are closely related. Some die demands of high hardness, long life.
Such as the use of T10 steel dies, hardness 54 ~ 58HRC, only washed thousands
of times a burr on the workpiece great. If the hardness to 60 ~ 64HRC, the
grinding life of up to 2 to 3 million. However, if continue to improve
hardness, fracture occurs earlier. Some die hardness should not be too high, as
the die manufacturing using Crl2MoV 58 ~ 62HRC hardness, the general life of
2-3 million, invalid form of chipping and cracking, and if the hardness down to
54 ~ 58HRC, life expectancy increased to 5 ~ 60 000, but decreased to 50 ~
53HRC hardness appears easy to blunt the die edge phenomenon. Thus, mold
hardness must be based on material properties and failure modes may be.China precision machining Should
enable the hardness, strength, toughness and wear resistance, resistance to
fatigue strength needed to achieve a particular stamping process the best match.
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