Plastic mold assembly points

- Apr 17, 2018-

         There are many types of plastic molds, even if the same type of mold, due to different types of plastic forming, the beginning and the accuracy requirements are different, the assembly method is not the same. Therefore, the assembly drawing should be carefully studied before assembly, parts drawing, understand the role of each part, Features and technical requirements.          There are many types of plastic molds, even if the same type of mold, due to different types of plastic forming, the beginning and the accuracy requirements are different, the assembly method is not the same. Therefore, the assembly drawing should be carefully studied before assembly, parts drawing, understand the role of each part, Features and technical requirements, determine the assembly benchmark. Through assembly, and finally fully achieve the product of the quality indicators, mold movement accuracy and the use of the various technical requirements.

1. Assembling datum, assembly datum can be roughly divided into

        (1) The main working parts in plastic molds such as cores, cavity and inserts are used as the reference parts for assembly. Other parts of the mold have assembly datum parts for the preparation and assembly.

         (2) Trimming and assembly of the template side guide surface of the guide post bushing or die for the assembly reference plane.


2. Mold assembly accuracy, mold assembly accuracy includes

           (1) each zero, the mutual accuracy of the components, such as distance dimension accuracy, coaxiality, equality, verticality, etc.

           (2) Relative motion accuracy, such as linear motion of drive accuracy and Rotary motion accuracy, etc. (3) Fitting accuracy and contact accuracy, such as clearance, interference amount, etc. (4) Wall thickness of molded plastic parts. When a new mold is to be formed, the wall thickness of formed parts should be offset to the lower limit of the dimensions. . 3. Repairing principle

         (1) Fixing the demoulding inclination, in principle, the cavity should ensure that the big end size is within the dimensional tolerance of the part. The core should ensure that the small carbonyl size is within the dimensional tolerance of the part.

        (2) The corner is round Corner radius, cavity should be small, core should be large

        (3) When the mold has both horizontal and vertical parting surface correction should make the vertical parting surface contact with the horizontal parting surface slightly Gap. Gap value view> 叽笮. Small molds can be contacted with each other only after they are coated with red. The gap between large molds is about 0.02 mm.

         (4) For the molds that are closed by the slanting surface, the inclined surfaces are closely contacted and the parting surface is formed. There should be a clearance of 0.02-0.03mm.

         (5) The arc and straight line connection of the repair surface must be smooth, and the surface must not have dents. The grater lines should be consistent with the direction of mold opening.