CNC machining small Pa66 Plastic Pinion Plastic Gears

OEM/ODM/Custom Services

All parts are customized according to customers' designs, drawings or samples.
We also help customers to develop
new items and create prototypes.

Shenzhen pride Industrial Co., Ltd.

Block D, Dianlian Science Park, Matian St., Guangming District, Shenzhen 518106, China

crush@pride-cnc.com

+8615629044483

Contact：Chloe

+86-917-3387002

With the development of industry and the wide application of engineering plastics, it is more and more common to replace metal gears with plastic gears, especially in the occasions where the transmission torque is not large, the lubrication condition is not good, the transmission is stable, and the noise is low. widely. Engineering plastics that can be used to make gears include PA, POM, PC, PSU, etc. Because the molding shrinkage rate recommended by the data has a relatively large range value, it is generally considered that it is very difficult to inject high-precision gears. The following describes the calculation method of injection mold molding size for small module (m=0.8) spur gears for electric fans. It has learned some experience in solving the two major problems of low strength and poor dimensional stability that are generally believed to exist in the application of plastic gears. 1 test process

1.1 Plastic gear Figure 1 shows an example of a plastic gear

1.2 The gating system of the plastic gear injection mold in the form of gate must consider that the plastic gear will not produce weld marks, otherwise it will affect the strength of the gear and cause serious stress, thereby reducing the quality of the gear. For this reason, a center gate is used.

1.3 Equipment selection It is estimated that the weight of the part plus the gate is about 10g. Considering the existing equipment and the ease of placing the insert, a 15g vertical injection machine is selected. The mold structure is shown in Figure 2.

The molding size calculation is based on the injection data of precision small module gears and years of practice. Due to the inconsistent shrinkage of the tooth tip circle, tooth root circle, and tooth thickness (mainly measured by the common normal line), after many tests, it is summarized and carried out according to the part structure Make reasonable corrections to obtain an imaginary gear, and then design a mold with the imaginary gear to inject an ideal gear.

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