Attention should be paid to the product wall thickness of injection mold
1. 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.
2. Uneven wall thickness will cause surface shrinkage.
3. Uneven wall thickness will cause pores and weld lines.
Precision of injection molded parts
Due to the non-uniformity and uncertainty of shrinkage during injection molding, the accuracy of injection molded parts is obviously lower than that of metal parts, so the dimensional tolerance of mechanical parts can not be simply applied. Appropriate tolerance requirements should be selected according to the standard. China also issued GB / t14486-93 in 1993
According to the dimensional tolerance of engineering plastics molded plastic parts, the designer can determine the dimensional tolerance of the parts according to the provisions of the standard according to the plastic raw materials used and the use requirements of the parts.
At the same time, the appropriate design tolerance accuracy shall be determined according to the comprehensive strength of the factory and the design accuracy of peer products.
Deformation of injection molded parts
Improve the rigidity of injection product structure and reduce deformation. What are the basic points of injection mold design? Try to avoid flat structure and reasonably set flanging and concave convex structure. Set reasonable stiffeners.
Buckle position
1. The buckle device is designed to be shared by multiple buckles at the same time, so that the overall device will not be unable to operate due to the damage of individual buckles, so as to increase its service life, and then add more fillets to increase the strength.
2. It is that the tolerance requirements of relevant dimensions of buckle are very strict, and too many reverse buckle positions are easy to cause buckle damage; On the contrary, if the reverse buckle position is too small, the assembly position is difficult to control or the combined part is too loose. The solution is to reserve a way to change the mold and add glue easily.
Attention should be paid to the maintenance of injection mold
1. Refer to the last die casting product sent for repair with the die, and carefully check the problems of the die. Whether there is strain, die sticking, crushing and meat falling, whether the small core is bent or broken, whether the movable core is inserted and positioned incorrectly, whether the push rod is broken or the length of the push rod is changed, whether the fastening bolt is loose, etc. Repair or replace according to the damage
2. The cavity collapse, crack and block falling that cause slight tensile damage to the casting can be repaired by local welding. The welding repair shall be operated in strict accordance with the welding process, otherwise a lot of die life will be lost. The above faults of small formed parts are more serious or the die is damaged.
3. If the forming surface of large formed parts is seriously collapsed, cracked, dropped, etc., local welding repair can be carried out. The welding repair shall be carried out in strict accordance with the welding repair process, otherwise a lot of die life will be lost. The above faults of small formed parts are more serious or the die is damaged.
4. For the mold that has been repaired and maintained, the molding surface, parting surface and mounting surface shall be treated with rust prevention, closed and fixed, and the installation direction of SINOSURE injection mold on the machine shall be placed on the base plate.
