Apapun jenis plastiknya, itu memiliki tingkat penyusutan tertentu. Jika tidak dikendalikan dengan benar, itu akan langsung mengarah pada perubahan ukuran bagian cetakan injeksi. Jika perubahannya terlalu besar, itu akan langsung mengarah pada kualitas produk cetakan injeksi yang tidak memenuhi syarat. Ini adalah periode yang tidak ingin dilihat oleh banyak pabrik cetakan injeksi, and the three major factors affecting the dimensional change of injection molding parts.
1. Wrong selection of injection molding materials
The shrinkage of injection molding materials has little effect on the dimensional accuracy of plastic parts. If the precision of molding equipment and mold is very low, but the shrinkage rate of molding material is very small, it is very easy to ensure the dimensional accuracy of plastic parts. Secara umum, the smaller the shrinkage of molding material is, the more difficult it is to ensure the dimensional accuracy of plastic parts. Karena itu, in the selection of molding resin, it is necessary to fully consider the influence of shrinkage rate of raw materials on the dimensional accuracy of plastic parts. For the selected raw materials, the variation range of shrinkage rate must not be greater than the requirements of dimensional accuracy of plastic parts.
It should be noted that the difference of shrinkage rate of various resins is relatively small, and the analysis is based on the degree of crystallization of resins. Umumnya, the shrinkage of crystalline and semi crystalline resins is higher than that of non crystalline resins, so the range of shrinkage changes is small, and the shrinkage fluctuation of corresponding plastic parts after molding is also large; For the crystalline resin, the crystallinity is low, the molecular volume is reduced, and the shrinkage of the plastic part is small. The size of the resin spherulite also has an effect on the shrinkage rate. The spherulite is large, the gap of the molecular building is large, and the shrinkage ratio of the plastic part is large, so the impact strength of the plastic part is low.
2. Kegagalan cetakan injeksi
The structural design and manufacturing accuracy of the mold indirectly affect the dimensional accuracy of the plastic part. In the molding process, if the rigidity of the mold is lacking or the molding pressure in the mold cavity is very low, the mold will deform, which will cause the plastic part forming size to be unstable.
If the fit clearance between the guide pillar and the guide sleeve block of the mould is out of tolerance due to less manufacturing accuracy or excessive wear and tear, the forming dimensional accuracy of the plastic part will also be reduced.
The first mock exam is that if the rigid filler or glass fiber reinforced material is used to form the raw material, the cavity will be slightly worn, or if the cavity is formed by one mold, the error between the cavity and the gate, the flow path and the improper balance of the feeding port will result in the filling process.
3. Injection molding equipment failure
If the plasticizing capacity of molding equipment is not enough, the feeding system is not stable, the screw speed is not stable, the stop function is abnormal, the check valve of hydraulic system is out of order, the thermocouple of temperature control system is burnt out, and the heater is open circuit, dll., the molding size of plastic parts will not be stable. If these faults are found out, targeted measures can be taken to eliminate them, including the failure of injection mold.
Dalam proses pencetakan injeksi, any small problem will affect the quality of injection molding products, and even directly affect the size change.
Tentang JasonMould Industrial Company Limited
Jasonmould adalah pembuat cetakan Cina dari cetakan plastik- cetakan injeksi, cetakan die casting, cetakan tiup plastik, cetakan rotasi, medis cetakan injeksi plastik, dua tembakan cetakan injeksi plastik, masukkan cetakan, overmolding, cetakan injeksi logam, cetakan injeksi mikro, cetakan injeksi bubuk, cetakan injeksi keramik, cetakan injeksi cair, cetakan injeksi husky, cetakan rumah tangga, pengecoran cetakan, alat cetakan mati, cetakan khusus, cetakan cina, perkakas prototipe cepat rapid, perkakas prototipe plastik plastic, perkakas tekan pukulan, mati dan perkakas untuk bagian ponsel / ponsel cell, bagian otomotif, penyedot debu, alat isi ulang, telepon, mesin fotokopi, komputer, speaker multimedia, dan banyak produk elektronik dan peralatan rumah tangga lainnya. Dan juga produsen produk plastik, produsen cetakan Cina- bagian-bagian yang terbuat dari plastik, tangki air plastik, bola plastik, wadah plastik, gesper plastik, jangkar plastik, gantungan plastik, sendok plastik, pemasangan pipa plastik, gelas plastik, peralatan makan plastik, gelas plastik, botol-botol plastik, nampan plastik, wadah kosmetik plastik, kotak plastik, wadah makanan plastik, kursi plastik, tutup plastik, penutupan tutup plastik, tabung plastik, pipa air plastik, kenop plastik, tabung plastik, kotak utilitas plastik, rak plastik dan sebagainya.
Kontak:
Orang: James Yuan
Perusahaan: JasonMould Industrial Company Limited
Menambahkan: Desa LongGang,Kota LongXi,Kabupaten BoLuo,Kota HuiZhou,Provinsi Guangdong, Cina
Telp: 86-752-6682869
Surel: [email protected]
Situs: https://www.jasonmolding.com/custom-injection-molding/
