Tanda kimpalan
Plastik lebur sendi leleh di rongga itu berada dalam beberapa helai kerana lubang penembusan, kadar aliran tidak konsisten, dan kawasan di mana aliran bahan pengisi terganggu. Gabungan jenis bahan lebur suhu rendah ini tidak boleh bercantum sepenuhnya dan menghasilkan sambungan gabungan linear. Sebagai tambahan, pengisian suntikan pintu juga akan menghasilkan sambungan gabungan. This kind of weld mark only occurs at the fusion part of the molten material (the product with one gate and does not make the material flow from two directions generally has no fusion mark), itu dia, it only occurs in the products formed with holes or multiple gates, where the strength is lower than that of other parts. The weld marks of grid and other parts appear in the center, which have an influence on the strength and appearance.
The distinction between the weld mark and the crack can be distinguished by applying ink on the product; With this phenomenon, the flying edge is also easily produced in the place where the weld mark is found. This means that the pressure of the material is at a higher level where the weld marks are located. Disebabkan ini, there are few dents in the fusion mark.
If you want to avoid the weld mark, only change the position of the gate so that the weld mark occurs in a position that is not visible or looks smooth. The pin on the mold (the hole in the work in process) will generally have a weld mark.
It can also be used to make the weld mark happen on the excess sheet of the product, and then cut the sheet off
The details of weld marks are as follows:
1. acuan: the welding mark is related to the gate and the shape of the parts. When it cannot be eliminated, it should be moved to a position that does not affect the appearance quality. Oleh itu, if there are too many gates in the same cavity, the gate or symmetrical setting should be reduced or the setting should be as close as possible to the fusion joint; Exhaust system should be set up for poor exhaust at the fusion joint; The gate is too large and the pouring system is not in proper size. The gate shall be set to avoid the flow of melt around the hole of the insert or to use the insert as little as possible; If the wall thickness changes too much or the wall thickness is too thin, the wall thickness of the parts shall be uniform; Jika perlu, overflow chute shall be set at the weld joint, and cut off after forming or designed as an automatic off potential.
2. Proses: injection pressure and speed are too low, and the temperature of the barrel and mold are too low, which causes the melt into the mold to cool early and the fusion joint appears; When the injection pressure and speed are too high, the injection will appear and the fusion joint will appear; The viscosity of plastics and density should be increased by increasing the speed and back pressure; Plastic should be dry well, recycled materials should be used less, too much release agent or poor quality will also appear weld joints; Reduce the locking force, and facilitate exhaust.
3. plastik: if the fluidity of the molten material is insufficient, the temperature of the melt will be lower and the pressure loss is also large, which will make the weld mark obvious and the strength will decrease; The measure is to raise the temperature of the molten material to improve the fluidity; Accelerate the injection speed to make the fusion point without cooling, raise the mold temperature and reduce the temperature of the molten material; To reduce the flow resistance, the thickness of the parts on the path of gate or thickened to the junction is expanded. It is helpful to use plastic with good fluidity to reduce weld mark. When multiple gates are used, the weld marks will be produced, while when single gate can be formed, there may be no weld marks. Lubricants and stabilizers shall be added to plastics with poor fluidity or heat sensitivity; Plastic contains many impurities, if necessary, to replace the plastic with good quality.
4. Although the welding marks of air or volatile components are unavoidable as mentioned above, the air or volatile components should be removed first when the molten material flows. Jika ekzos tidak lancar, the weld marks will certainly become obvious. Tekanan dalaman acuan yang tidak mencukupi juga akan berlaku, it may cause insufficient filling or burn (refer to insufficient filling and burn); Considering this possibility, it is necessary to exhaust or set exhaust channels by using the gap of inserts. The welding marks caused by air are exactly the opposite of the usual methods to eliminate the weld marks. Kadang kala, the injection speed can be reduced to make the weld marks not obvious.
5. When the mold cavity surface is coated with release agent, once the molten material is transported to the fusion joint, the weld mark will be caused by the non fusion between the release agent and the molten material. This phenomenon is more serious when using silicon containing release agent. If the weld mark is heavy, the parts are often fragile and easy to crack (refer to fragile).
6. The color additive causes that if aluminum foil or particle colorant is added to form the round plate, the weld mark obviously changes with the properties of the colorant. It is difficult to eliminate this weld mark (refer to uneven color).
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/
