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Cold work die steel failure analysis problem
News Category:News   Author:admin    Published on:2014-08-284    Writing:【】【】【

Development of China's mold industry has begun to take shape in the mold products automotive, home appliances, communications and instrumentation, plastics, metal processing and other occupations, the cold mold absolute market. Mold is an important foundation of manufacturing skills with technology, product quality molds to produce products not only contact quality, function, and a direct impact on the manufacturing cost and power.

     Cold work die steel three typical types of failures that overload failure, loss of shape and characteristics grinding efficiency and fatigue failure; compare several cold work die steel processes and functions; points commented cold work die steel with high hardness appearance cracking sensitivity, notch crack liaison function and process parameters, to make some progress in the cold mold cracking resistance, reduce early failure die approach.

     Based on past use cold mold and failure status accounting, quality depends on a large mold mold material selection and process to develop, based on the use of mold conditions, proper selection of raw materials and mold to develop a reasonable treatment process to reduce the early Cold die failure is very important. This paper reviews and analyzes related to the failure of the cold mold problems.

     Cold mold materials and function needs

     The primary conclusion of the cold mold metal or non-metallic materials for cold forming, including cold stamping, cold kneading and cold heading die. And hot die match, these molds work load, scale accuracy, high surface quality requirements and processing large quantities, mostly for the end product. To get used to the conditions demand, multi-use high-carbon or alloy steel cold mold, job hardness 58-60HRC.

     Cold work die steel is generally used to satisfy demand strength (including tensile, compressive and flexural strength), to meet the toughness, hardness and wear to meet (exceptionally appearance), in order to satisfy the anti-fatigue (especially is a multi-function impulse fatigue); large load on cold kneading and cold upsetting body mold, due to the onset of severe deformation heat (about 300 ℃), demand for information has greater resistance to deformation and cracking.

     Cold die failure analysis problem

     Through the domestic cold heading and cold, cold kneading die failure status query analysis, accounting outcomes below.

     From the results of the accounting perspective, the primary failure of the cold mold type overload failures and loss of grinding efficiency, about 80% -90% of the total number of failures. Cold Heading to breaking the mold or normal wear and tear (partial drop) mainly cold kneading mold to brittle fracture or loss of efficiency-based mill, and Die in effect lost ground based. High job stress, the stress of the big shake cold kneading and cold heading dies rendered brittle fracture failure was significantly higher than the share of low job stress Die.

     Failure to collect less fatigue crack share, which is more choice of high-carbon cold mold materials, high alloy steel, hardness up to 60HRC, fatigue cracking difficult to distinguish shapes and accounting related.

     Cold die failure in practice many reasons, this mold data elements, but also with operating equipment accuracy and condition, materials and appearance quality products, tooling and machining precision, operations and other factors relating to the quality of personnel, during some random factor to the failure analysis adding difficult.

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