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Dongguan Jinchen Precision Mold Co., Ltd. is a manufacturer specializing in high-precision mold parts processing and technology research and development. It has more than ten years of production experience and has solved many supply and technical problems for customers.

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Characteristics of precision molds and their differences from ordinary molds

Now let’s first understand the six major characteristics of precision mold molding:

1,The products have high dimensional accuracy and small tolerances, that is, they have high-precision dimensional boundaries;

2,The repeatability of the product is required to be high, and it must have dimensional stability of days, months and years;

3,The mold punches material is good, the rigidity is sufficient, the dimensional accuracy and smoothness of the cavity and the positioning accuracy between the templates are high;

4,Use precision injection molding machines to replace conventional injection molding machines;

5,Adopt precision molding punches technology;

6,Choose materials suitable for precision molding.

The key dimensions of many precision molds punches are not allowed to have a slope, but when making the mold, the tolerance zone is generally used to add a small slope, such as gear mounting posts, etc. When building a digital model, you must pay attention to the adjustment of tolerances. Generally, the 3D model provided by the customer is useless because many of its dimensions are the extreme sizes. If the mold is designed according to this, the mold produced will basically be Scrapped.

Secondly, the drawings must be comprehensive, complete and accurate. Use inserts as much as possible and consider processing more. The relevant dimensions must be guaranteed by machines as much as possible (the role of the fitter master’s skills in precision plastic molds is to strictly follow the drawings. Most of the mold parts Strict design tolerances are required. Not only the working parts of the cavity and core, but also the dimensions related to the installation position of all inserts must be strictly limited. Generally controlled at +/-0.005.

my country’s precision mold industry is already at the forefront of the world. At present, my country’s precision molds have four major characteristics: wear resistance, toughness, fatigue fracture performance, and high temperature performance. The following are the four major characteristics of precision molds.
Four characteristics of precision molds:

  1. Wear resistance
    When the blank plastically degenerates in the mold cavity, it both flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, causing the mold to fail due to wear. Therefore, the wear resistance of materials is one of the most basic and important properties of molds.
    Hardness is the main factor affecting wear resistance. Generally speaking, the higher the hardness of the mold parts, the smaller the wear amount and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
  1. Strong toughness
    Most of the working conditions of molds are very harsh, and some often bear large impact loads, resulting in brittle fracture. In order to prevent mold parts from suddenly breaking during work, precision hardware molds must have high strength and toughness.
    The toughness of the mold mainly depends on the carbon content, grain size and organizational state of the material – Precision Mold Manufacturing.
  1. Fatigue fracture performance
    During the working process of the mold, fatigue fracture is often caused under the long-term action of cyclic stress. Its forms include small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture.
    The fatigue fracture performance of the mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
  1. High temperature performance
    When the working temperature of the mold punches is high, the hardness and strength will decrease, leading to early wear or plastic deformation of the mold and failure. Therefore, precision hardware mold materials should have high anti-tempering stability to ensure that the mold has high hardness and strength at working temperature.
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