There are many types of plastic molds, even if the same type of mold, due to different types of plastic molding, the beginning and the accuracy requirements are different, the assembly method is not the same.
Therefore, the assembly drawing and parts drawing should be carefully studied and analyzed before assembly to understand the function, characteristics and technical requirements of each part, and to determine the assembly standard. Through assembly, all quality indicators of the product are finally fully achieved. The technical requirements.
1, the assembly basis can be roughly divided into:
● The main working parts of the plastic mold, such as the core, cavity and inlay, are used as the reference parts for assembly. Other parts of the mold have assembly reference parts for the preparation and assembly.
● Trim and assemble the template base surface of the guide pillar guide or mold for the assembly reference plane.
2, mold assembly accuracy
● Accuracy between components, such as distance accuracy, coaxiality, equality, verticality, etc.
● relative motion accuracy, such as transmission accuracy linear motion and rotary motion accuracy.
● With the accuracy and contact accuracy, such as with the gap, the amount of interference and other contact conditions.
● Wall thickness of plastic molded parts. When making new molds, the wall thickness of the molded parts should be at the lower end of the dimension.
3, principle of repair
●Match 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 end size is within the dimensional tolerance of the part.
● Corner radii at corners, cavity should be small, core should be large.
●When the mold has both horizontal and vertical parting planes, the gap should be slightly separated when the true and false parting surface contacts. The small molds can be contacted with each other only after they are painted red. The mold clearance is about 0. 02mm.
For the mold with a slanted mold, after the bevel is tightly closed, there should be 0. 02-0. 03mm clearance at the parting surface.
● The arc and straight line of the fitting surface should be smooth, and the surface must not have dents. The grater lines should be consistent with the direction of mold opening.