Composition and working principle of vertical injection molding machine

(1) composition: the injection molding machine consists of four parts: injection, mold closing, hydraulic transmission and microcomputer control system. The injection device makes the plastic uniformly moulded into molten state and injects a certain amount of molten material into the mold cavity with sufficient pressure and speed. The mould closing device ensures that the forming mould can be closed and opened reliably. The hydraulic drive system is the main drive system of the injection molding machine, which provides the pressure needed for injection and mold closing, regulates the mold closing and injection speed, and realizes a series of sequential actions such as mold closing and injection under the control of microcomputer. Microcomputer control system to 80C552 as CPU, with two pieces of 8255 for expansion, including the motherboard, input and output board, display board and analog quantity control board, injection molding machine sequence action switch quantity and temperature, speed, pressure and other analog quantities to control the realization of microcomputer closed-loop automatic control. 1. Closing and closing: the molding cycle of the injection molding machine starts from the closing of the mold. The mold first closes quickly with low pressure. 2, moved forward and injection injection device: upon confirmation of the mold to achieve the required degree of close tightly, injection device moved forward, make the nozzle and mold, can access to the injection cylinder pressure oil, with the oil cylinder piston rod into the head of screw with high pressure, high speed of molten material into the cavity, the screw head pressure acting on the molten material for injection pressure. The injection pressure and speed, as well as the temperature of the molten material and the mold, determine whether the plastic can be filled into the mold cavity. 3. Pressure maintenance: the molten material injected into the mold cavity will shrink due to the cooling effect of the low-temperature mold. Pressure maintenance is to supplement the molten material with a certain pressure, and the product is dense. When holding pressure, the screw has a small amount of forward movement due to shrinkage. 4. Product cooling and premolding: when the molten material injected into the mold cavity loses the possibility of reflux from the gate, the pressure maintaining can be removed to make the product cool and shaped. At this time, the screw rotates under the drive of the hydraulic motor, and the granular plastic from the hopper moves forward along the screw groove with the help of the transmission effect of the rotating screw. In the process of plastic movement, due to the external heating and the screw shear effect of intense internal friction, the temperature increases evenly, and eventually gradually softened into a molten viscous flow state, and constantly transported to the front end of the cylinder. As the screw head molten material pressure, so that the screw back, when back to the metering value, the screw stopped rotating, ready for the next injection.

youngstrong
Dongguan Taiwang Machinery Co.,LTD
Add:NO.127,longyan road,Chongkou Industrial district,Dongguan city,China.
Wedsite:www.twmachines.com
Mobile:86-13829239482
Tel:86-769-81701081
Email:[email protected]