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Development And Application Of Plastic Mold Steel
Nov 09, 2017

1. Develop easily machinable, polished materials

With the production of precision parts such as optical discs, disks and prisms, the demand for easy-processing mirror steel increases. This steel contains less non-metallic impurities, meticulous microstructure uniform, no fiber orientation. It is the main development direction of plastic mold steel.

2. Corrosion-resistant steel

Mold in the long-term operation and maintenance process, easy to rust by corrosion, and with the addition of plastic molding ingredients, mold more susceptible to corrosion. Therefore, it is required to improve the corrosion resistance of the base metal body and to develop some corrosion-resistant stainless steel materials.

3. Martensitic aging alloy steel

This steel has sufficient mechanical properties and outstanding process performance, especially high strength, toughness, abrasion resistance, low thermal expansion coefficient, is a good steel manufacturing injection mold, but expensive.

4. Carbide

Mainly used for making high life expectancy, large parts production batch mold.


Reasonable choice

With the plastic products used in industry and daily life more and more widely, plastic mold industry demand for mold steel is also growing. In plastic molding, mold quality assurance of product quality is self-evident. Plastic mold has been to the precision, large and multi-cavity direction, the performance requirements of plastic mold steel higher and higher, the performance of the plastic mold should be based on the type of plastic, product use, production volume, dimensional accuracy and surface Depending on the quality requirements.

Factors affecting the choice of plastic abrasive steel

Plastic mold parts are divided into two categories: one for the structure, including the casting system, guide, top template, ejection mechanism, support, etc .; the other is the molding: including cavity, core, embedded Inserts and so on. One of the first part of the mechanical parts according to the requirements of strength and structural design, materials commonly used in low-carbon structural steel, alloy steel and carbon steel. The molded parts due to the complex structure, the workpiece requires high dimensional accuracy, low surface roughness, seam adhesion, the mechanical properties of the mold material, wear resistance and processing technology are made of professional requirements.

1.1 the main form of failure of the mold

As the mold temperature is higher, the pressure is greater, and some plastic materials prone to wear and corrosion of the mold surface, and sometimes also by the impact of mold release. The main failure of the form of the following three.

1.1.1 Surface wear

Due to the reinforced resin filler in the plastic, the surface of the mold cavity is washed, worn and corroded, thereby affecting the increase of the surface roughness of the mold cavity surface and exceeding the size tolerance.

1.1.2 deformation

Mold plastic deformation, resulting in the surface depression, wrinkles, pitting and corner collapse and other damage.

1.1.3 fracture

Fracture caused by local stress concentration in the mold.

1.2 mold manufacturing and use requirements

Plastic mold on the material strength and toughness requirements lower than the cold mold and hot mold, according to its failure form and job requirements, the basic performance requirements summarized as:

1.2.1 Sufficient wear resistance

As the surface wear is one of the main forms of failure of the mold, so the mold should have sufficient hardness to ensure the wear resistance of the mold to ensure the life of the mold. Usually need to choose the right material and the appropriate heat treatment methods to meet the hardness requirements. However, when the hardness reaches a certain value, the effect of hardness on the wear resistance is not obvious.

1.2.2 to reduce the heat treatment deformation

As injection molding parts are often more complex shapes, plastic mold hardened hard processing, and sometimes can not even be processed. In order to increase the hardness, heat treatment must be carried out. To take appropriate measures to reduce the impact of heat treatment deformation, the mold must be processed after heat treatment, should be used to heat deformation of small materials.

1.2.3 excellent cutting performance

In the manufacture of plastic molds, the cost of cutting is often accounted for most of them. In order to prolong the service life of the cutting tools and ensure the quality of the machined surfaces, the mold materials are required to have good machinability. For pre-hardened materials, good machinability is also required after quenching.

1.2.4 good polishing performance and etching

In order to obtain high quality plastic products, the surface of the mold cavity must be polished to reduce the surface roughness value. In order to ensure that the mold has good electrical processing and mirror polishing, pattern pattern etching, the mold steel should be material The high purity, fine organization, uniform, dense, non-directional fiber.

1.2.5 good corrosion resistance

Plastic injection of PVC or additives such as flame retardants when the plastic will decompose corrosive gases on the surface of the mold have a certain degree of chemical corrosion, the production of such molds should be selected with a certain degree of corrosion resistance of steel .


Hubei Kaixin Supply Chain Management Co., Ltd.

TEL :+8618272169977 ; 0714-6510168

FAX:0714-6519746

Email:info@hubeikaixin.com

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