Taian Ruiji axle Co., Ltd.

注塑模具生产过程

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▶ Firstly, Process analysis of plastic products.

Before mold design, the designer should fully analyze and study whether the plastic products conform to the principle of injection molding processing, need to carefully negotiate with the product designer, has reached a consensus. Including the geometric shape of the product, dimensional accuracy and appearance requirements, necessary discussion, as far as possible to avoid the unnecessary complexity in the mold manufacturing.

 

▶Secondly, mold structure design.

A set of high-quality mold, not only need to have good processing equipment and skilled mold manufacturing workers, another very important factor is to have a good mold design, especially for complex mold, mold design quality accounts for more than 80% of the mold quality. An excellent mold design is: under the premise of meeting the requirements of the guests, the processing cost is low, the processing difficulty is small, the processing time is short. To do this, we should not only fully digest the customer's requirements, but also have some understanding of the injection molding machine, mold structure, processing technology and mold factory's own processing capacity. Therefore, to improve the level of mold design, the following points should be done:

 

1. Understand every detail in the design of each mold and understand the use of each part in the mold.

2. In the design of reference to the previous similar design, and understand the mold processing and product production in its situation, learn the experience and lessons.

3. Learn more about the working process of injection molding machine to deepen the relationship between mold and injection molding machine.

4. Understand the process of processed products in the factory and understand the characteristics and limitations of each process.

5. Understand the test results and mold modification of the molds designed by myself, and learn lessons.

6. Try to use the mold structure which was more successful before in the design.

7. Learn more about the influence of mold water on products.

8. Study some special mold structures and understand the latest mold technology.

 

▶第三，确定模具材料并选择标准件。

在选择模具材料时，除了应考虑产品的精度和质量外，还应结合模具厂的实际加工和热处理能力做出正确选择。此外，在

▶ 第四点, 零件加工与模具组装。

除了在模具精度的设计中给出最佳结构和合理公差外，零件加工和模具组装也非常重要。因此，加工精度和加工方法的选择在模具制造中占据绝对主导地位。成型产品的尺寸误差主要由以下几部分组成：

1. 模具的制造误差约占1/3

2. 模具磨损引起的误差约占1/6

3. 成型件收缩不均匀引起的误差约占1/3

4. 预定收缩与实际收缩不一致引起的误差约占1/6

总误差 = (1)+(2)+(3)+(4)

因此，为了减少模具制造误差，首先应提高加工精度，随着数控机床的使用，这一问题已得到很好控制。此外，为了防止模具磨损和变形引起的误差，在加工精度较高且产品产量较大时，应对型腔和型芯等关键部位进行淬火处理。在中大型模具中，为了节省材料并便于加工和热处理，模具设计应尽可能采用镶嵌结构。为了解决成型件收缩不均匀以及预定收缩与实际收缩不一致引起的误差，在模具制造中一般选择产品公差的1/3作为模具的制造公差。目的是为后期成型工艺留出较大的调整余量，从而解决成型工艺引起的误差。

 

▶ 第五，测试模型。

从设计开始到装配完成的一套模具，仅完成了整个制造过程的70%~80%。对于预定收缩与实际收缩不一致导致的误差，脱模是否顺利，冷却效果如何，特别是浇口的尺寸、位置和形状对产品精度和外观的影响，必须通过模具试验来测试。因此，模具试验是检查模具是否合格并选择最佳成型工艺的不可或缺的步骤。