The computer keyboard is an important component of the computer. The keyboard is mainly divided into three parts: upper shell, lower shell, and buttons. The workmanship of the keys affects the quality of the keyboard. The quality of workmanship can be distinguished from the appearance, whether the surface, edges, and other processing of the keyboard are fine and reasonable. The low-quality keyboard has a rough appearance and poor key elasticity, which affects its use. How to manufacture high-quality keyboard keys? Of course, it is related to the design of injection molds for keyboard buttons!

The material commonly used for keyboard keys is ABS, with a shrinkage rate of 1.005. The keyboard keys are small in size and have a simple shape, and there are two inverted buttons inside for assembly. Due to the small space position, this inverted button cannot be used for slide core pulling or oblique ejection. How to mold the reverse button is a difficult point in the design of keyboard button injection molds.

After analysis, the problem of difficult reverse demolding was solved by using a secondary ejection method. Due to the small spatial location, an elastic straight top was designed for each of the two inverted positions. The two elastic straight tops were assembled on the bottom needle plate, and the circular top pins at the four corners of the plastic part were designed on the upper needle plate. After mold opening, the top rod of the injection molding machine drives the lower top needle plate, and the elastic straight top and round top needles together push the button out of the rear mold core, freeing up deformation space for the inverted position. Continuing to push out, the lower top pin plate is limited by the square iron, and the lever lifts the upper top pin plate to accelerate the push out. The round top pin separates the plastic part from the elastic straight top, and the inverted position achieves strong detachment.