4 points for attention in high precision plastic mold design

Author: MULAN – Plastic Molding Manufacturer

Mold design is the cornerstone of manufacturing high-precision plastic molds, and its importance can be seen in general. This article mainly describes the four major points for attention in designing high-precision plastic molds. 1) Determine the mold opening direction and parting line position of high-precision plastic molds; each plastic product needs to determine its mold opening direction and parting line at the beginning of the design to ensure that the core slider is minimized body, reducing the impact of parting lines on appearance. After determining the mold opening direction of the high-precision plastic mold, try to make the reinforcing ribs, bayonets, protrusions and other structural designs of the product consistent with the mold opening direction, so as to avoid core pulling, reduce seams and prolong molding time.

2) After determining the mold opening direction of the high-precision plastic mold, an appropriate parting line can be selected to avoid undercuts in the mold opening direction and improve the appearance and performance of the mold. 3) Properly adjusting the draft angle of the high-precision plastic mold can avoid damage such as white edges, deformation, and cracking on the top of the product. In the design of deep cavity structure products, the slope of the outer surface should be larger than the slope of the inner surface as much as possible to ensure that the core of the plastic injection mold will not move, so as to obtain a uniform product wall thickness, while ensuring the material strength and product opening time.

4) Each different plastic has a certain range of wall thickness, generally 0.54mm. When the wall thickness exceeds 4mm, it will cause problems such as excessive cooling time and shrinkage of plastic products. This should be considered to change the product structure. Uneven wall thickness can cause surface shrinkage. As well as pores and weld lines.

In addition, rational use of ribs can increase the rigidity of the product and reduce deformation.