When it comes to injection molding manufacturers, are they manufacturers of injection molds alone or manufacturers of both molds and molded products? Due to the widespread use of injection molded products, many entrepreneurs have entered the plastics industry. Some manufacturers only produce injection molds and lack the ability to produce finished products, while others offer integrated production, from mold development and manufacturing to product processing. Shibang Mold & Injection Molding, a factory that provides comprehensive services from mold development to injection molding, shares the characteristics of molds produced by injection molding manufacturers:
1. The cavity and core are three-dimensional.
The exterior and interior shapes of plastic parts are directly formed by the cavity and core. These complex three-dimensional surfaces are particularly challenging to machine, especially the blind hole internal molding surfaces within the cavity. Traditional machining methods require highly skilled workers, numerous auxiliary fixtures, and numerous tools, and result in lengthy processing cycles.
2. High precision and surface quality requirements, along with a long service life, are essential. Currently, the dimensional accuracy requirements for general plastic parts are IT6-7, with a surface roughness of Ra0.2-0.1μm. The corresponding dimensional accuracy requirements for injection mold components are IT5-6, with a surface roughness of Ra0.1μm or less. The roughness of the recording surface of laser discs must reach mirror-finished levels of 0.02-0.01μm, which requires the mold surface roughness to be below 0.01μm.
Long-life injection molds are essential for improving efficiency and reducing costs. Currently, injection molds are generally required to have a service life of more than one million cycles. Precision injection molds require a rigid mold base, increased mold plate thickness, and the addition of support columns or tapered positioning elements to prevent mold deformation under pressure, which can sometimes reach 100MPa.
The ejector device is a key factor influencing product deformation and dimensional accuracy. Therefore, a well-selected ejection point should be selected to ensure uniform demolding. High-precision injection molds often utilize a spliced or fully assembled structure, which requires significantly improved machining accuracy and interchangeability of mold components.
3. Long process flow and tight manufacturing timelines.
Mold expert Luo Baihui believes that injection molded parts are often integrated with other components to form a complete product. In many cases, other components are already completed, and the molds are eagerly awaiting release. Because of the high precision requirements for the product's shape and dimensions, and the varying properties of resin materials, molds require repeated trial runs and revisions after completion, significantly tightening development and delivery timelines.
4. Design and manufacturing at different locations.
Mold manufacturing is not the end goal. Instead, the user submits the product design, and the mold manufacturer designs and manufactures the mold based on the user's requirements. In most cases, injection molding of the product is also performed at a different factory. This results in product design, mold design, and manufacturing, and product production being carried out at different locations.
5. Specialized division of labor and dynamic integration.
Mold production batches are small, typically single-piece production. However, molds require numerous standardized components, from mold bases to ejectors. These cannot and will not be completed by a single manufacturer. Furthermore, the manufacturing process is complex, and the use of conventional and CNC equipment is extremely uneven.
The above are the characteristics of the molds of the injection molding manufacturer summarized by HUIWEN injection molding processing. Welcome to consult.
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