Instable Dimensions Of Modified Plastic Injection Products— Mold Failure
The structural design and manufacturing accuracy of the mold directly affect the dimensional accuracy of the plastic parts. If the rigidity of the mold is insufficient or the molding pressure in the mold cavity is too high during the molding process, deformation of the mold may cause deformation of the plastic parts. stable.
If the gap between the guide pillar and the guide bush of the mold is poor due to poor manufacturing precision or excessive wear, the dimensional accuracy of the molded part of the plastic part will also decrease.
If there are hard fillers or glass fiber reinforced materials in the molding raw material that cause serious wear of the cavity, or when using a single-mold and multi-cavity molding, there is an error between the cavity, gate, runner, etc., and feed port balance and other reasons. Inconsistent mold filling can also cause size fluctuations.
Therefore, when designing the mold, sufficient strength and rigidity of the mold should be designed, and the processing precision should be strictly controlled. The cavity material of the mold should be made of a wear-resistant material, and the surface of the cavity should be heat-treated and cold-hardened. When the dimensional accuracy of the plastic parts is very high, it is better not to adopt a multi-cavity structure. Otherwise, in order to ensure the molding accuracy of the plastic parts, a series of auxiliary devices must be set on the mold to ensure the precision of the molds, resulting in the production of molds. High cost.
When plastic parts have thicker errors, they are often caused by mold failures. If the thickness of the plastic part is thick in the mold under one cavity condition, generally the relative positional deviation of the cavity and the core is caused by the installation error and poor positioning of the mold. At this time, for those plastic parts whose wall thickness is required to be very precise, they cannot be positioned solely by guide posts and guide bushes, and additional positioning devices must be added.
If it is a partial thickness error under a multi-cavity condition, under normal circumstances, the error at the beginning of molding is small, but the error gradually increases after continuous operation. This is mainly caused by the error between the cavity and the core. This phenomenon is most likely to occur especially when hot runner molding is used. In this regard, a dual cooling circuit with a small temperature difference can be set in the mold. If it is a thin-walled round container, a floating core can be used, but the core and cavity must be concentric.
Related Products
This is custom heading elementDescriptionFeedbackDescription Specification: Part Name Customized Rubber Compression Silicone Cover for Bluetooth Horn Speaker Service OEM OR ODM Part Material Silicone or rubber (NR, NBR,SBR,BR,IR,CR,EPDM,IIR,VITON(FKM),SIR,PU,ACM,CO,etc) Material Hardness Silicone about 5~90 Shore A; rubber about 10~90 Shore A Size Customized Shape Customized Color Customized according to Pantone colors Appearance as customer’s requirement Drawings 2D OR 3D acceptable Temperature Resistance -40~300 degree centigrade Technology Hot pressing molding or injection Molding Second Processing Vulcanizing/ Deburring/Silk-screen/Carving/printing Quality control internal QC control Part Feature 1.Oxidation , Chemical,oil, acid ,alkali , weather resistance 2. colorful ,Anti-aging,good flexibility, good elasticity Food grade material FDA or LFGB Package Normally PE bag+carton or customized as customer’s request Trade Term Ex-works; FOB Shenzhen/Guangzhou ; CIF Specification ROHS Directive Compliant Green Products What is our advantage? 1. Has sound and mature supporting supply chain 2. Lower mold costs…
Stamped Anchor Frame for Door ComponentsDescriptionFeedbackDescription Stamped computer housing made as clients’ drawing Die type: Progressive die. Raw materials: DC zinc coated, S/S, cold steel, copper, brass, aluminum, all variant raw material available. Surface finish: Powder coating Tooling lifespan: 1 million Feeding machine and stamping machine are used We have our own maintenance team…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription Cavity/Core Material 718H, P20, NAK80, 2316,2738,Din2344,H13 and available Product Material ABS, PC, PP, PVC, POM, PMMA, PS, PE, PET, Rubber, Silicone, PA, PBT, PEI, etc. Base (HASCO) German , FUTABA Japan, DME US, LKM China or by requested Structure Double color injection mould, Solid…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription TV Shell Injection Molding Product Name Injection Molding for TV Case Cover Material ABS, PC, PP, PS, POM, PMMA etc. Mould Base Material: LKM, FUTA, HASCO, DME, etc. or as per customer’s requirement. Surface treatment powder coating, polishing, chrome plating Packing Inner-Plastic Bag; Outer -Standard Carton Box. Usage…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription Scale Model Cars Many miniature vehicles were originally aimed at children as playthings. But Precision-detailed miniatures made specifically for adults are a significant part of the market now. Fit Precision Mold Co., Ltd is specialized in producing all kinds of plastic scale model cars and accessories in different…
This is custom heading elementDescriptionFeedbackDescription Product Design Begin with good design FPM has the unique ability to contribute value at every phase of your product development via our global technical expertise. With state of the art design services, the right tools and a full staff of experienced people on hand, FPM can help…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription CNC Plastic Machining Prototype Services Rapid prototyping (RP) technology is an advanced manufacturing technology developed in 90s, is one of the key technologies for the development of new products and manufacturing enterprises, to promote product innovation, shorten the development cycle of new products, improve product competitiveness has a…
Customizing Car Dashboard Covers With Injection MoldDescriptionFeedbackDescription FIT PRECISION MOLD CO., LTD specializes in providing good design and high-precision products at product developing and producing area. Our professional staff are experienced at tool/mold making service including plastic injection mold (mould),die casting mold (mould) and metal stamping mold (die); At the same time we are involved…