Home > News > Content
Factors Influencing Mould Life And Ways To Improve The Die Life
Apr 25, 2016

Die's life governing fine blanking technology, application and development of, so for the service life of the mould we must focus up, xiaobian given below provide what are the factors affecting the die service life, and tells us to improve die life what ...
Factors influencing the die service life:
1, structure of Fine Blanking Technology (sharp corners, thin, cantilever, dimensional tolerances, and so on).
2, fine blanking of material (material, thickness, hardness, toughness, surface quality).
3, the fine stamping die structures (strength, stiffness, mold orientation, steering, exhaust, and lubrication of small punch).
4, material (material, size and uniformity, hardness, toughness of carbide).
5 mold manufacturing (mold forging, machining, heat treating, cutting, grinding, Assembly)
6, the operation (adjusting height, pressure, speed, feed precision cleaning, lubrication, and blanks).
7, die (proper storage and reasonable stress tempering, grinding, cleaning, rust-proof).
Way of improving the die service life:
1, review the process of fine blanking parts. Fine Blanking Technology (especially the corner radius) of fine blanking die's life has a certain influence, less technology (especially sharp corners), and should make recommendations for improvement to the design department. Figure 1 corner radius for parts and tool life, R/t ≥ 0.8 is better, if less is less than 0.25 will result in tool life.
2, material selection and heat treatment of fine blanking dies. Fine Blanking material usually Cr12MoV main die working parts, when the workpiece thickness is greater than 4mm, punch and die can be used W6Mo5Cr4V2 of high speed steel. For great strength, force demanding of punch and die, powder metallurgy steels (V4, ASP23, ASP30) or carbide GT30. Convex, concave die heat treatment hardness is generally take 58~62HRC, for wear as the main failure modes, simple shape of the mold, 60~64HRC; for complicated shapes, and cutting edge as the main failure of the mold, 56~60HRC, and even 54~58HRC.
Cr12MoV mold heat treatment, when the simple shape of the cutting edge, cutting thickness thin (t ≤ 3mm), 1 secondary hardening (1020 ° c quenching and tempering 220 ° c) for high strength and abrasion resistance. When the complex shape of the cutting edge, cutting thicker material (t>3mm), using 2 hardening process (1080 ° c quenching and tempering 520 ° c) you can obtain high impact toughness and stability. W6Mo5Cr4V2 die of heat treatment, quenching at low temperature must be used to obtain high strength and good toughness.
3, problems in structure design of fine blanking dies. Die stress better and preventing bias load, mechanical, cantilever, one-way; * guidance for reducing the working parts wear and ensures uniform gap, avoids eating and avoid injury without positive pressure center as valid. When designing a fine blanking, deep hole punch, punch jacket structure should be reasonable, in the design of large die, should be taken into account in its internal structure with small pillar to increase steering precision. Pressure plate, punch guide better when material thickness t ≥ 4mm, die preferably stressing Jack. Due to the fine stamping die of co-ordination between the various components more sophisticated, used lubricating oil is thick, between the underside of the die and punch punch, and in conjunction with the accurate punches and setting Yi to form a closed space. Mold movement process in the, closed district of air easily quickly row go, makes mold component between due to friction caused of heat easily with air away, will effect push pieces Board, and top material rod of movement, reduced production speed, even will caused parts uneven of phenomenon, effect fine die of normal life, so should in convex, and concave die end of surface, and convex die fixed Board and base Shang open exhaust slot.
4, fine blanking die Assembly. Fine Blanking die Assembly in addition to the upper and lower die cutting edge even, coaxial and relationship of the various parts, but also pay particular attention to the working parts are high, ensure correct location in closed and open, to ensure that its work *.
5, production operations and maintenance. Install die when adjusting the pressure, on the premise of ensuring the quality of fine blanking parts, blank holder force and pressure as small value, while working in the fine-blanking progressive die, strip first and pay special attention to mold the force balance at the end, otherwise punch is easy due to lateral force and broken. Attention in feeding set height limits and other devices in order to prevent the weight of the waste. Find parts excess burrs should be timely grinding grinding is 0.1~0.2mm by weight, and to eliminate internal stress.