Plastic mold steel is not only a basic industry, but also an important field of high-tech industry. Mold industry is the cornerstone of industry and the driving force of social progress. So what are the design rules of plastic mold steel? Now let's give you a detailed explanation.

一、开模方向和分型线

1、 Mold opening direction and parting line

每个注塑产品在开始设计时要确定其开模方向和分型线，以保证尽可能减少抽芯滑块机构和分型线对外观的影响。

At the beginning of the design of each injection molding product, first determine its mold opening direction and parting line, so as to reduce the core pulling slider mechanism and eliminate the influence of parting line on the appearance as much as possible.

开模方向确定后，产品的加强筋、卡扣、凸起等结构尽可能设计成与开模方向一致，以避免抽芯减少拼缝线，延长模具寿命。

After the mold opening direction is determined, the stiffener, buckle, protrusion and other structures of the product shall be designed to be consistent with the mold opening direction as far as possible, so as to avoid core pulling, reduce the seam line and prolong the service life of the mold.

开模方向确定后，可选择适当的分型线，避免开模方向存在倒扣，以改善外观及性能。

After the mold opening direction is determined, the appropriate parting line can be selected to avoid reverse buckle in the mold opening direction, so as to improve the appearance and performance.

二、脱模斜度

2、 Demoulding slope

适当的脱模斜度可避免产品拉毛(拉花)。光滑表面的脱模斜度应≥0.5度，细皮纹(砂面)表面大于1度，粗皮纹表面大于1.5度。

Proper demoulding slope can avoid product galling (galling). The demoulding slope of smooth surface shall be ≥ 0.5 degrees, that of fine grain (sand surface) surface shall be greater than 1 degree, and that of coarse grain surface shall be greater than 1.5 degrees.

适当的脱模斜度可避免产品顶伤，如顶白、顶变形、顶破。

Proper demoulding slope can avoid product top injury, such as top white, top deformation and top breaking.

深腔结构产品设计时外表面斜度尽量要求大于内表面斜度，以保证注塑时模具型芯不偏位，得到均匀的产品壁厚，并保证产品开口部位的材料强度。

In the design of products with deep cavity structure, the inclination of the outer surface shall be greater than that of the inner surface as far as possible, so as to ensure that the mold core does not deviate during injection molding, obtain uniform product wall thickness and ensure the material strength of the opening of the product.

三、产品壁厚

3、 Product wall thickness

各种塑料均有一定的壁厚范围，一般0.5～4mm，当壁厚超过4mm时，将引起冷却时间过长，产生缩印等问题，应考虑改变产品结构。

All kinds of plastics have a certain wall thickness range, generally 0.5 ~ 4mm. When the wall thickness exceeds 4mm, it will cause problems such as too long cooling time and shrinkage printing. It should be considered to change the product structure.

四、加强筋

4、 Stiffener

加强筋的合理应用，可增加产品刚性，减少变形。

The reasonable application of stiffeners can increase the rigidity of products and reduce deformation.

加强筋的厚度必须≤(0.5～0.7)T产品壁厚，否则引起表面缩水。

The thickness of stiffener must be ≤ (0.5 ~ 0.7) t product wall thickness, otherwise it will cause surface shrinkage.

加强筋的单面斜度应大于1.5°，以避免顶伤。

The slope of one side of the stiffener shall be greater than 1.5 ° to avoid top injury.

以上就是塑胶模具钢在设计方面的法则，想要在模具的加工的质量和精度上能决定产品的质量，在设计、制作是要严格按照技术规范。

The above is the design principle of plastic mold steel. If you want to determine the product quality in the quality and accuracy of mold processing, you should strictly follow the technical specifications in design and production.