Forming and demolding of single and double helical gears with tooth profile and helix angle

For modern injection molding production, the structure and performance of the mold must meet the high-efficiency automated production requirements of advanced molding equipment. Therefore, it is necessary to optimize and improve the mold release mechanism of helical gear molded parts, in order to effectively reduce the "rotation" resistance of helical gear molded parts or helical gear cavity during demolding, and improve the friction and wear resistance of mold working parts. For the molding and demolding of double-linked helical gears, in addition to the separation of the fixed distance sequence, it is also necessary to ensure that the pushing force of the pushing mechanism can be converted and transmitted through auxiliary devices or mechanisms after acting on the molded parts of the helical gear. Synchronous rotation of helical gear molded parts or helical gear cavity to complete the automatic mold opening process.

For the design and development of the injection molding mold for precision small-module plastic helical gears, the path selection is shown in Figure 1.

The injection molding of precision small modulus plastic helical gears is a relatively complex technology. Among them, the molding process conditions, the correction and compensation of molding shrinkage, the processing technology of molded parts, the mold structure and functions, etc. are used to control and ensure the molding quality of helical gears. Therefore, it is necessary to focus on solving the key technical problems of cavity size correction compensation, special-shaped cavity processing, and mold release mechanism design. The solution of the key technical problems of mold development will effectively promote the development of the plastic helical gear industry in the direction of high-end, greatly improving the cost-effectiveness of the product, thereby expanding the application of plastic helical gears, improving the technical economy of the corresponding reduction transmission device and the core competition of related industries Advantages, and at the same time play an important role in promoting the rapid development of the plastic helical gear molding industry and improving the work efficiency of the reduction transmission device