Apakah kecacatan suntikan retak dan albino?
Keretakan adalah kecacatan biasa pada produk plastik, yang disebabkan terutamanya oleh ubah bentuk tekanan. Terdapat terutamanya tekanan sisa, tekanan luaran dan ubah bentuk tekanan yang disebabkan oleh persekitaran luaran. Seperti yang ditunjukkan dalam gambar
Analisis dan penghapusan keretakan dan memutihkan kecacatan suntikan
1) Tegasan baki permukaan terlalu besar
Tegasan sisa yang berlebihan adalah punca utama keretakan permukaan bahagian plastik. Dalam operasi proses, the process parameters should be set according to the requirements of reducing residual stress of plastic parts. Especially when the temperature of molten material and mold is high and the melt flow performance is good, the injection pressure should be reduced as much as possible. When removing the cracking fault, the methods of eliminating cracks and cracking fault can be referred to.
If there are cracks on the surface of the plastic parts, annealing can be considered to eliminate them. The annealing treatment is to heat the plastic parts fully for about 1 hour at a temperature about 5 degrees lower than the hot deformation temperature of the plastic parts, and then cool them slowly. It is better to anneal the cracked plastic parts immediately after forming, which is conducive to completely eliminating the cracks. Walau bagaimanapun, it is difficult to eliminate cracks by annealing in mass production, so it is generally not suitable.
Sebagai tambahan, due to the residual stress in the crack, if the plastic parts with crack defects are sprayed, the flux in the coating is easy to cause the crack to dissolve and develop into a crack. Tekanan dalaman acuan yang tidak mencukupi juga akan berlaku, special attention should be paid to the selection of coatings and diluents that will not cause crack.
2) The surface of plastic parts is affected by concentrated external force
External force is the main cause of surface whitening of plastic parts. Dalam kebanyakan kes, the whitening part is always located in the ejection part of the plastic part. Sebagai contoh, in the demoulding process of plastic parts, due to poor demoulding, when the demoulding force on the surface of plastic parts is close to the elastic limit of resin, whitening will occur.
After whitening, the injection pressure should be reduced and the demoulding angle should be increased appropriately, especially the chamfer should be prevented near the stiffener and boss. The ejection device of the demoulding mechanism should be set at the wall thickness of the plastic part or the thickness of the ejection part of the plastic part should be increased appropriately.
Sebagai tambahan, the surface finish of the cavity should be improved to reduce the demoulding force, and a small amount of demoulding agent can be used if necessary.
Mengenai JasonMould Industrial Company Limited
Jasonmould adalah Pembuat acuan China dari acuan plastik- acuan suntikan, acuan pemutus mati, acuan plastik, acuan putaran, perubatan pengacuan suntikan plastik, dua pukulan pengacuan suntikan plastik, masukkan acuan, terlalu banyak, pengacuan suntikan logam, pengacuan suntikan mikro, pengacuan suntikan serbuk, pengacuan suntikan seramik, pengacuan suntikan cecair, acuan suntikan husky, acuan isi rumah, acuan pemutus, alat acuan mati, acuan khas, acuan cina, perkakas prototaip pantas, perkakas prototaip plastik, perkakas penebuk, mati dan perkakas untuk bahagian telefon bimbit / telefon bimbit, bahagian automotif, pembersih vakum, alat yang boleh dicas semula, telefon, mesin penyalin, komputer, pembesar suara multimedia, dan banyak produk elektronik dan perkakas rumah yang lain. Dan juga pengeluar produk plastik, pengeluar acuan China- bahagian plastik, tangki air plastik, bola plastik, bekas plastik, gesper plastik, sauh plastik, penyangkut plastik, sudu plastik, pemasangan paip plastik, plastik jatuh, pinggan mangkuk plastik, cawan plastik, botol plastik, dulang plastik, bekas kosmetik plastik, sarung plastik, bekas makanan plastik, kerusi plastik, penutup plastik, penutup penutup plastik, tiub plastik, paip air plastik, tombol plastik, tiub plastik, kotak utiliti plastik, rak plastik dan sebagainya.
Hubungi:
Orang: James Yuan
Syarikat: JasonMould Industrial Company Limited
Tambah: Kampung LongGang,Bandar LongXi,Daerah BoLuo,Bandar HuiZhou,Wilayah GuangDong, China
Tel: 86-752-6682869
E-mel: [email protected]
Tapak: https://www.jasonmolding.com/custom-injection-molding/
