Replicate gearbox and gearbox cover injection mold designs

Duplicate the design of the injection mold for the gearbox and the gearbox cover. The injection mold is to simultaneously form two injection molded parts of the gearbox and the gearbox cover in the same sub-injection mold, and the design of the injection mold for the gearbox and the gearbox cover. Since the size and weight of the two injection molded parts of the gearbox and the gearbox cover are not much different, the size of the design gate can be the same at the beginning. However, the size and weight of the gear box cover are smaller than the gear box after all. In order to keep the material flow balanced when filling the mold, Shanghai Mulan Injection Mold Factory can repair the gate after the mold test. In order to ensure the appearance of injection molded parts, the injection mold adopts a point gate pouring system, so the injection mold should use a standard mold base with three templates. In order to reduce the length of the point gate, a positioning ring can be used to reduce the height of the sprue bushing.





(1) Design of the core-pulling mechanism of the injection mold The core-pulling mechanism is to solve the 'obstacle body' of the two pits of the gear box and the gear box cover and the core-pulling of the 36H7 and Φ4mm holes. Since the gearbox requires two core pulls, the gear case cover only needs one core pull. In this way, one end of the two injection molded parts can share one core-pulling mechanism, and the other end of the gearbox uses another core-pulling mechanism. In fact, only two core-pulling mechanisms are used for the gearbox and the gear box cover. Therefore, two sets of bent pin slider core-pulling mechanisms are used to form two pits 'obstacles' and Φ36H7, Φ4mm holes on the gearbox and the gearbox cover. The placement position of the cavity and the form of the core-pulling mechanism,


① The gear box Φ36H7 hole and the gear cover pit 'obstacle body' core-pulling mechanism design, the large hole type and wide slider are installed in the T-shaped slot composed of two guide plates. When the parting surface I-I is opened, the bent pin drives the large-hole core and the wide slider, thereby realizing the core-pulling of the φ36H7 hole of the gearbox and the 'obstacle body' of the gear box cover pit. The wedge block is to wedge the wide slide block to prevent the wide slide block from displacing under high injection pressure. When the large-hole core and the wide slider are core-pulled, the balls enter the hemispherical pit at the lower end of the wide slider to limit the sliding of the wide slider.





②The gear box pit 'obstacle body' and the design of the φ4mm hole core-pulling mechanism are installed on the two guide plates to form the slider in the T-shaped slot, the small hole core, and the gearbox core. Open on the parting surface I-I , they are moved by the bent pins to perform core pulling and reset movements.


(2) Forming and demoulding of the gear case and the gear case cover The forming of the gear case and the gear case cover is formed by the mold inserts installed in the middle formwork and the dynamic module of the movable formwork respectively. The wheel box and gear box cover are completed by the push rod on the push piece plate and the installation plate, and the reset of the push rod is completed by the return rod.





Copying the injection mold design of the gearbox and gearbox cover, the copying of the plastic gearbox and the gearbox cover of the new car electric window regulator, Shanghai Mulan Injection Mold Factory is based on the molding traces of the injection mold structure on the sample. The structural scheme of the injection mold is produced by using the analysis of the molding trace technology and supplemented by the shape analysis of the injection molded parts. The machined gearboxes and gearbox covers ensure the performance and precision of the electric window regulator drive system. The weight of this new type of electric window lifter is only 1/10 of the traditional lifter, and it has the characteristics of few parts, small shape and size, light weight, simple structure, low noise and flexible transmission. And can rely on the performance of plastic self-lubricating, no need to add lubricating oil. Since most of the parts of the new electric window regulator are injection molded parts, the production efficiency is high and the cost is low.