In the mold, what is the pillow position, the contact s […]
In the mold, what is the pillow position, the contact surface and the insertion surface?
1. Pillow position: the sealing part of the cavity protruding from the parting surface. That is to say, the part extending along the PL line during parting, so the advantage is that it can be made into the rubbing surface instead of the rubbing surface. When making the pillow position, pay attention to the slope of the side. For the holes in the product, two methods are generally used in forming, i.e. inserting and relying.
2. Penetration: it means that the upper and lower surfaces of the upper and lower die cores are tightly closed, thus forming holes.
3. Interpenetration: it means that the upper mold core or the lower mold core extends to the opposite side and passes through the opposite mold core, forming holes.
Mold manufacturing inspection:
The raw material control of the mould is carried out from the following aspects:
1. Macroscopic examination
The chemical composition is decisive to ensure the performance of steel, but the composition is qualified, which can not fully explain the performance of steel. Because of the inhomogeneity of the internal structure and composition of steel, the macro inspection to a large extent complements the deficiency in this respect.
The macroscopical examination can observe the crystallization of steel, the damage of steel continuity and the inhomogeneity of some components.
Standard "rating chart of macrostructure defects of structural steel" gb1979
Macro common 8 kinds of defects: segregation, looseness, inclusion, shrinkage cavity, bubble, white spot, crack, fold.
2. Evaluation of annealed structure
The purpose of annealing is to reduce the hardness of steel, facilitate machining, and prepare the structure for subsequent heat treatment.
The annealing structure of carbon tool steel is evaluated according to the first grade rating chart of gb1298.
3. Carbide heterogeneity
There are a lot of eutectic carbides in the structure of Cr12 type ledeburite steel. The heterogeneity of carbides has a very important effect on the service performance, so the distribution of carbides must be strictly controlled.
In a word, due to the complicated production objects of mold factories and workshops, and how many of them are single pieces and small batches, it brings certain difficulties to the formulation and management of mold production quota. In addition, the production mode, equipment and technical quality of each factory and workshop are not the same, so when formulating the quota,
According to the actual situation of the factory and workshop, it is necessary to find out appropriate methods to work out advanced and reasonable working hours quota so as to improve the labor productivity.