Due to the wide range of structural design of injection mold, there are likely to be such and such problems. These structural design problems are often ignored and often appear, but these problems will also seriously affect the quality of the mold. Therefore, we need designers to pay attention to these problems.

　　However, some problems can not be solved by paying attention to them. It requires designers to have a solid knowledge of mold structure, be familiar with mold manufacturing process and forming process, also need rich practical experience, need to understand the knowledge of mold structure and parts design taboo, so as to give overall consideration to details during design.

　　If the following problems occur in the design and manufacturing of injection mold, the quality grade of the pair of mold is not the same, not only a grade is lower, but also there is no brand.

　　Common mistakes in design and manufacture of injection mold are as follows:

　　1. Unreasonable design of die structure and too large and thick die plate increase the manufacturing cost.

　　2. Only considering the material cost saving, the standard mold base is adopted. Without considering the quality and processing cost of the die, the wrong design of the reset rod position reduces the strength of the pressing plate.

　　3. For their own convenience, 3D designers did not design the two intersecting cooling water pipes in a standard way.

　　4. The screw can't replace the locating pin, and the slide plate has no locating pin. Reassembly can't guarantee the tightness of the slide.

　　5. The locating pin is wrongly applied, and the locating pin cannot bear the transverse force.

　　6. Repeated positioning in the same direction generally appears in mold design. That is to say, there is positioning, which increases the unnecessary manufacturing precision and increases the unnecessary manufacturing cost. In fact, such a design makes it difficult for the fitter to manufacture. Some fitters will use an electric grinding head to empty a part.

　　7. The design of guide post is too short or too long, because the standard mold base is used. The guide post shall be 25-30mm higher than the moving die core or inclined guide post, and shall not be too high or lower than the moving die core or inclined guide post, otherwise, it will not play a protective role.

　　8. Avoid the design error of the positioning structure of the moving and fixed dies with large gradient drop of the parting surface. In the design of the positioning structure of the movable and fixed mould for the plastic part mould with a large gradient drop of the parting surface, it is necessary to prevent the movable mould from shifting towards the low side without gradient.

　　9. Due to the unreasonable processing technology, the fixed plate of the ejector pin is deformed, and the thickness of the fixed plate of the ejector pin is increased.

　　10. The opening of oil tank is not standardized. The oil tank shall not be cut through or too many, which requires standard design.

　　11. The ejector rod will not swing after assembly. The purpose of swinging the ejector pin is to eliminate the manufacturing errors of the assembled ejector pin: center distance, perpendicularity, coaxiality, etc., so that the assembled ejector pin can move up and down freely without blocking.

　　12. Wrong design of support column. The support column is not placed in the least stressed position.

　　13. The oil groove is designed for the plane contact block. There is no relative movement between the plane contact block and the formwork, so it is unnecessary to set up an oil groove.

　　14. The design of the plane contact block is not appropriate, there are too many or it is better to use rectangle or circle.