Base is similar to a semi-enclosed box-shaped piece. Coil is installed inside box surrounded by vertical ribs. Outer side where vertical ribs are located and B and C surfaces are exterior surfaces. No push rod marks or obvious parting lines are allowed. End surface where height of vertical rib is located is mating surface with upper shell. Try to avoid setting flat push rods. Side A is installation surface. Bottom surface must be horizontal, a push rod or parting surface can be set. In order to realize two functions of contactor rail installation and screw installation, this plastic part is designed with 2 dovetail grooves and 4*φ5.2mm through holes. In order to be consistent with installation dimensions of other models of contactors, distance and position of 4*φ5.2mm holes cannot be changed, resulting in 2*φ5.2mm holes penetrating dovetail groove that needs to be formed by side core pulling. This is a difficulty in mold design. Material of plastic part is reinforced flame-retardant nylon. Vertical ribs have a large area, a high height, and a thin wall thickness of only 1.2 mm. Allowable draft angle is small, plastic part is easy to stick to mold and trap air during molding. φ14mm hole and fan-shaped side hole are heat dissipation holes, which are located on appearance surface and need to be formed by side core pulling. How to ensure smooth forming and demoulding of vertical ribs and side holes, while ensuring that there are no push rod marks or obvious parting lines on appearance, is also a difficult point in mold design. 3.0, 9.3, and 12.8mm slots are clamp installation slots and require side core-pulling molding.
Tag: core-pulling molding
Car rearview mirrors are divided into exterior rearview mirrors and inner rearview mirrors. Exterior rearview mirrors of different models have different shapes and structures, and outer shell is an important appearance part of rearview mirror. In order to meet functional, appearance and economic requirements of automotive products, structure of rear-view mirrors tends to be beautiful, refined and integrated. One-piece shell reduces number of rear-view mirror assembly parts, number of molds required, and production costs, making it the first choice for rear-view mirror structure design. At present, there are more domestic researches on split housings, but less research on design of integrated housings. Now we introduce design of an injection mold for an integrated housing of an automobile rearview mirror.
Gud Mould 