Pengukuran dan kontrol suhu sangat penting dalam cetakan injeksi. Meskipun pengukuran ini relatif sederhana, sebagian besar mesin cetak injeksi tidak memiliki titik atau sirkuit penjemputan suhu yang cukup. Di sebagian besar mesin cetak injeksi, suhu diinduksi oleh termokopel. Termokopel pada dasarnya terdiri dari dua ujung kabel yang berbeda. Jika salah satu ujungnya panas dari yang lain, itu akan menghasilkan telegram kecil; semakin panas itu, semakin kuat sinyalnya.
Pengatur suhu
Thermocouples are also widely used as sensors for temperature control systems. Pada instrumen kontrol, mengatur suhu yang diperlukan, and the sensor display will be compared with the temperature generated at the set point. In this simple system, ketika suhu mencapai titik setel, it is turned off and the power is turned on again when the temperature drops. This system is called open close control, because it is not open or shut.
Melt Temperature
The temperature of the melt is very important, and the temperature of the cylinder used is only instructive. The melt temperature can be measured at the nozzle or measured by the air injection method. The temperature setting of the cylinder depends on the melt temperature, kecepatan sekrup, backpressure, injection quantity and injection cycle. If you do not have experience in processing a particular level of plastics, please start with a low setting. In order to facilitate control, the ejection cylinder is divided into zones, but not all of them are set at the same temperature. If the operation is long or operated at high temperatures, set the temperature in the first zone to a lower value, which will prevent premature melting and splitting of the plastic. Before starting the injection, ensure that the hydraulic oil, hopper seal, mold and ejection cylinder are at the right temperature.
Tekanan injeksi
This is the pressure that causes plastic flow and can be measured with sensors on the nozzle or hydraulic line. Itu tidak memiliki nilai tetap, and the more difficult the mold filling, injection pressure also increases, injection line pressure and injection pressure is directly related.
Stage 1 pressure and second stage pressure
Selama fase pengisian siklus injeksi, high injection pressure may be required to maintain the injection rate above the required level. After filling, the mold no longer needs high pressure. Namun, in the injection molding of some semi-crystalline thermoplastic (seperti PA dan POM), due to the sudden change of pressure, the structure will deteriorate, so sometimes the use of secondary pressure is not necessary.
Mode-locked pressure
In order to resist injection pressure, the clamping pressure must be used. Instead of automatically selecting the large values available, the projection area should be considered to calculate a suitable value. The projection area of injection molded parts is a large area seen from the application direction of clamping force. Untuk sebagian besar kasus cetakan injeksi, it is about 2 ton per inci persegi, atau 31 megabytes per square meter. Namun, this is only a low value and should be considered as a very rough empirical value, karena dulu bagian injeksinya ada kedalamannya, then the side wall must be considered.
Backpressure
This is the pressure that must be generated and exceeded before the screw retreats. Although the high back pressure is beneficial to the uniform dispersion of pigment and the melting of plastics, itu juga memperpanjang waktu kembalinya sekrup tengah, reduces the length of the fiber contained in the filling plastics and increases the stress of the injection molding machine; karena itu, semakin rendah tekanan punggungnya, the better it can not exceed under any circumstances. Injection molding machine injection pressure of 20%.
Tekanan nosel
The pressure of the nozzle is the pressure inside the nozzle. It is about the pressure of plastic flow. Itu tidak memiliki nilai tetap, tetapi meningkat seiring dengan sulitnya pengisian cetakan. There is a direct relationship between nozzle pressure, tekanan saluran dan tekanan injeksi. On the spiral injection molding machine, the nozzle pressure is about ten percent less than that of the injection pressure. In piston type injection molding machine, the pressure loss can reach about ten percent. In piston type injection molding machine, the pressure loss can reach fifty percent.
cetakan injeksi plastik presisi tinggi
This refers to the filling speed of the die when the screw is used as punch. In injection molding of thin-walled products, it is necessary to adopt high injection rate, so as to fully fill the mold without solidification of the melt and produce a smooth surface. A series of programmed firing rates are used to avoid defects such as ejection or trapped gas. Injection can be carried out under open loop or closed loop control system.
Whatever injection speed is used, the value of the injection speed and the injection time must be recorded on the recording table. The injection time refers to the time required for the mold to reach the predetermined initial injection pressure, which is part of the screw propulsion time.
JasonMould Industrial Company Limited, didirikan pada 2010, adalah produsen cetakan injeksi terkemuka di Cina. JasonMould mengkhususkan diri dalam produksi cetakan plastik untuk peralatan rumah tangga, peralatan medis, peralatan elektronik, peralatan keselamatan serta sistem pemantauan.
Perusahaan telah berakhir 15000 pabrik meter persegi. Dengan divisi perkakas injeksi plastik yang memiliki mesin dan keahlian yang berbeda,
JasonMould menawarkan alat dari suku cadang ponsel kecil dan presisi hingga sebesar suku cadang otomotif. Alat kami terutama diekspor ke AMERIKA SERIKAT., Eropa, Jepang dan Inggris. Strategi diversifikasi dan layanan penuh JasonMould telah memenangkan pujian dari pelanggan di seluruh dunia.
Misi kami adalah untuk menyediakan produk dan layanan cetakan berkualitas tinggi kepada pelanggan kami. Kami bertujuan untuk melampaui ekspektasi harga pelanggan kami, kualitas dan pengiriman tepat waktu. Untuk mencapai misi kami, JasonMould:
·Berkomitmen untuk terus meningkatkan keterampilan dan efisiensi karyawan,
·Memberikan karyawan kami lingkungan kerja yang bersih dan aman,
·Meningkatkan teknologi mesin dan peralatan pendukung melalui program perawatan yang ketat, dan
·Mempertahankan perkakas pelanggan ke puncak kinerja tertinggi
Untuk lebih lanjut tentang produsen kustom produk cetakan plastik,silahkan kunjungi https://www.jasonmolding.com/
Pertanyaan Hubungi:
Kontak person: James Yuan
Nama Perusahaan: JasonMould Industrial Company Limited
Alamat: Desa LongGang,Kota LongXi,Kabupaten BoLuo,Kota HuiZhou,Provinsi Guangdong, Cina
Telepon: 86-752-6682869
Surel: [email protected]
Situs web: https://www.jasonmolding.com
