Plastic Injection Mold, Injection Mold Maker, Mold Parts, JinHong Plastic Mold Factory

    The typical structure of the guide bush is a straight guide sleeve, which is simple in structure and easy to process. It is used for simple injection molds or occasions where there is no backing plate behind the guide sleeve. The headed guide sleeve has a more complex structure and is used in occasions with high precision. The fixing hole of the guide sleeve is easy to be processed at the same time as the fixing hole of the guide post, which is used for the situation where two plates are fixed.

    In order to make the guide post enter the guide sleeve smoothly, the front end of the guide sleeve should be rounded. The guide post hole is made into a through hole to facilitate the discharge of air and residual waste in the hole. If the template is thick and the guide post hole must be made into a non-through hole, a small hole can be punched on the side of the non-through hole to exhaust.

    The guide bush is made of the same material as the guide post or wear-resistant materials such as copper alloy, and its hardness should generally be lower than that of the guide post to reduce wear and prevent the guide post or guide sleeve from pulling. The surface roughness value of the fixed part of the guide bush and the guide sliding part is generally Ra0.8μm.

    In order to increase the firmness of the insertion of the guide sleeve and prevent the guide sleeve from being pulled out when the mold is opened, the side of the guide sleeve can be processed into a gap, and the guide sleeve can be fixed from the side of the mold plate with a tightening screw or an annular groove can be used instead of the gap, or you can also Drill holes on the side of the guide bush and fasten with screws. The guide sleeve can also be fixed by riveting the end after pressing into the template, but this method is inconvenient to assemble, disassemble and replace.