Classification characteristics and precautions of mold ejector pins

Classification of thimble use:

According to the different requirements of the mold, the selection of thimble series is divided into four categories.

1. Low output, low requirements mold: the mold life requirements are not high, within 100,000 molds, the mold core is ordinary pre-hardened steel, it is recommended to give priority to the use of station marks or surface nitriding pins, such as AAE, EEX, EPS, ESS, etc.

2. Medium output, medium requirements mold: mold life of 100,000-500,000 molds, it is recommended to choose vacuum hard thimble, such as EE1790, EPSS, etc.

3. High-output, high-demand molds: mold life of 500,000-1 million molds, it is recommended to choose vacuum + surface nitriding thimble or SKH51 high-speed steel vacuum hard needle, such as H-EXX, EEPH, etc.

4. High-precision, high-demand molds: For molds with a life span of more than 1 million molds and high precision, it is recommended to choose vacuum + surface DLC coated thimbles, such as DH-EXX, DS-EEX, etc.

Layer ejector pin features:

1. DLC coating has the advantages of high hardness and low friction coefficient, which plays a great role in improving wear resistance, production efficiency and product quality.

2. Improve corrosion resistance: Engineering plastics and other products will produce a large amount of gas when molding, and the DLC coating can prevent the thimble from being corroded by gas.

Spiral groove thimble features:

1. It can prevent sintering jamming caused by thermal expansion during sliding;

2. The spiral groove on the thimble effectively discharges the gas in the cavity out of the mold.

Scope of application of spiral groove ejector pin:

1. Suitable for molds with cavity temperature 80-200°C;

2. Suitable for high-speed ejection and gap ejection mold;

3. It is suitable for continuous forming with long mold maintenance cycle, unmanned operation and precision forming for mass production.

Notes:

Spiral groove thimble should not be used for high-gloss mirror and transparent product molds

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