ABS plastic parts, electronic product mold plastic mold, injection molding part

ABS plastic parts, electronic product mold plastic mold, injection molding part

Service Details:

  • Brand:Kayou
  • Serial Number: M-0038
  • Country of Origin:Shenzhen, China
  • Certificate:ISO9001

Payment & Shipping Terms:

  • Price Quote:Negotiable
  • Minimum Order: 1
  • Average Delivery Time:25 days
  • Payment Method:T/T
  • Package Details:Wooden Case
  • Ability to Supply:5 Set/per month
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ABS plastic parts, electronic product mold plastic mold, injection molding part

Description

ABS plastic parts, electronic product mold plastic mold, injection molding part

Defects and Preventive Measures in Die Manufacturing

Forging process

High carbon and high alloy steels, such as Cr12MoV and W8Cr4V, are widely used in manufacturing dies. However, there are some defects in this kind of steel, such as segregation of composition, uneven coarseness of carbides and uneven structure. When choosing high carbon and high alloy steel to make die, it is necessary to adopt reasonable forging process to form module blank. On the one hand, the steel can reach the size and specification of module blank, on the other hand, the structure and properties of steel can be improved. In addition, the thermal conductivity of high carbon and high alloy die steel is poor, the heating speed can not be too fast, and the heating should be uniform. In the forging temperature range, reasonable forging ratio should be adopted.

The radius of the corner at the dimension transition should be strictly ensured in the cutting of the cutting die, and the intersection of the arc and the straight line should be smooth. If the cutting quality of the die is poor, it may cause die damage in the following three aspects: 1. Because of improper cutting, the sharp corner or the radius of the fillet are too small, which will lead to serious stress concentration in the work of the die. (2) If the machined surface is too rough, there may be cutter marks, cracks, notches and other defects, which are not only the stress concentration point, but also the origin of cracks, fatigue cracks or thermal fatigue cracks. (3) If the decarbonization layer produced by the die blank during rolling or forging can not be completely and evenly removed during cutting, the uneven hardening layer may be produced during the heat treatment of the die, which will lead to the decrease of wear resistance.

After quenching and tempering, the grinding process of grinding die is usually carried out to reduce the surface roughness. Due to the influence of the factors such as too large grinding speed, too fine grinding wheel size or poor cooling conditions, the local overheating of the surface of the die, the change of the local microstructures, the softening of the surface, the reduction of the hardness, or the high residual tensile stress will all reduce the service life of the die, select appropriate grinding parameters to reduce the local heating, and carry out after grinding under possible conditions. Stress treatment can effectively prevent grinding cracks. There are many measures to prevent grinding overheating and grinding cracks, such as reducing the grinding feed of dies by using coarse-grained grinding wheels with strong cutting force or grinding wheels with poor cohesion, choosing appropriate coolant, and eliminating grinding stress by tempering at 250-300 C after grinding.

When EDM is used to process dies, the current density in the discharge zone is very high, and a lot of heat is generated. The temperature of the processing area of the dies is as high as 1000 C. Because of the high temperature, the metallographic structure of the heat affected zone will change. The surface of the dies will melt due to the high temperature, then quench, solidify quickly, and form a re-solidification layer. Under the microscope, it can be seen that the re-solidified layer is white and bright, and there are many micro-cracks in it. In order to prolong the service life of dies, the following measures can be adopted: adjusting the parameters of EDM, grinding the surface after EDM by electrolysis or mechanical abrasion, removing the white layer in the abnormal layer, especially removing the micro-cracks, arranging a low temperature tempering after EDM to stabilize the abnormal layer and prevent the propagation of micro-cracks.

According to the methods mentioned above, the development cycle can be shortened, the defects of die manufacturing can be effectively prevented, the quality of die manufacturing can be improved and the production cost can be reduced.

 

 

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