Injection mould is an important equipment for producing various industrial products. With the rapid development of the injection molding industry and the promotion and application of injection molded products in industrial sectors such as aviation, aerospace, electronics, machinery, ships, and automobiles, the requirements for molds are increasingly higher. Traditional mold design methods are no longer able to meet today's requirements. Compared with traditional mold design, computer-aided engineering technology has great advantages in improving productivity and ensuring product quality, as well as reducing costs and reducing labor intensity. Molds are widely used, and almost all product component forming and processing in modern manufacturing industries require the use of molds. Therefore, the mould assembly industry is an important part of the country's high-tech industry and an important and valuable technical resource.
Injection mold structural parts refer to various parts that make up the mold structure, including various parts for guiding, demolding, core pulling, and demoulding. These include the front and rear clamping plates, front and rear setting plates, pressure bearing plates, pressure bearing columns, guide posts, demolding plates, demolding rods, and returning rods.
In order to ensure that the movable mold and the fixed mold are accurately centered during mold clamping, guide components must be set up in the mold. In injection molds, four sets of guide pins and guide bushes are usually used to form the guide of the injection mold assembly. Sometimes, internal and external tapered surfaces that match each other are also set on the movable and fixed molds to assist in positioning.
In the injection moulding process, the injection-molded product and its solidified material in the runner need to be pushed or pulled out by the ejection mechanism. The ejection fixed plate and the ejection plate are used to clamp the ejector rod. A reset rod is generally fixed in the ejector rod. When the movable and fixed molds are clamped, the reset rod causes the ejection plate to reset.
For some injection molded products with side cavities or side holes, side core pulling is necessary before they can be ejected smoothly after being pushed out. In this case, a side core pulling mechanism must be set up in the injection mold assembly.
Injection molds use various CNC machining methods, the most widely used of which are CNC milling and machining centers. CNC wire cutting and CNC electrical discharge machining are also very commonly used in mold CNC machining. Wire cutting is mainly used for processing various straight-walled molds, such as concave-convex molds in stamping processing and inserts and slide blocks in injection molds, as well as electrodes used for electrical discharge machining. For mold parts with high hardness that cannot be processed by machining methods, electrical discharge machining is mostly used. In addition, electrical discharge machining is also used for sharp corners, deep cavity parts, narrow grooves, and other parts of mold cavities. CNC lathes are mainly used to process standard parts of mold rods, as well as mold cavities or cores of rotating bodies, such as injection molds for bottles and bowls, forging molds for shafts and disks. In mold machining, the application of CNC drilling machines can also improve machining accuracy and shorten the processing cycle.