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2022

What are the characteristics of precision mold?

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Compared with ordinary molds, precision molds have higher requirements in the production process. For its raw materials, design, processing, precision, size and other content, it must be kept improving. The processing technology must be a high-precision processing molding process. What are the specific requirements of precision molds.

Precision mold six molding requirements.

1. product specifications of high precision, small dimensional tolerances, both high-precision specification limits;

The repeated precision standard of 2. products is high, and it is necessary to have a day. Month. the size reliability of the year;

3. die shell material is good, stiffness foot. Dimensions precision of female die. Smoothness and high accuracy between templates;

4. choose high precision plastic machine instead of basic plastic machine;

5. selection of high precision forming process;

6. selection of raw materials into high precision forming.

The focus of precision mold processing must be on precision. Precision molds have very high requirements for dimensional tolerances, usually in/-0.005. The main specifications of many precision molds are not allowed to have a slope, but the mold production will generally be flexible use of tolerance level plus a small inclination, such as transmission gear installation column head. Precision mold in the design drawings must consider the operability and controllability of processing, in order to ensure the smooth progress of processing.

Four characteristics of precision mold

1. Wear resistance

When the blank is plastically deformed in the concave mold of the injection mold, it circulates and rolls along the surface of the mold cavity, causing intense friction between the outside of the mold cavity and the blank, thus causing the grinding tool to be invalid due to damage. Therefore, the corrosion resistance of the data is the most basic. One of the most important characteristics.

Strength is the primary factor that endangers wear resistance. In general, the higher the strength of the mold parts, the smaller the wear rate, the higher the wear resistance. In addition, the wear resistance is also related to the type of cementite in the data. Total. Shape. Size and spread related.

2. Strong ductility

Mobei's standard of operation is mostly extreme, and some often bear a large impact load, resulting in brittle fracture. In order to avoid sudden brittle fracture of mold parts at work, high-precision metal molds should have high hardness and ductility.

The key to the ductility of the die shell is the carbon content of the raw material. Grain size and structure-precision mold manufacturing.

3. Characteristics of fatigue cracking

Mold shell work in the ring section, in the long-term role of the bad pressure, usually caused by fatigue rupture. The type has a small kinetic energy of repeated impact fatigue rupture. Rashin fatigue rupture touch fatigue rupture and bending fatigue rupture.

The key to the fatigue cracking characteristics of the die shell is its compressive strength. Ductility. Strength. and the composition of the components in its raw materials.

4. High temperature characteristics

When the operating temperature of the die shell is higher, the strength and hardness will be reduced, resulting in the initial damage of the die shell or plastic deformation and invalid. Therefore, the precision metal mold steel should have high anti-quenching reliability to ensure that the mold has high strength and compressive strength at ambient temperature.

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