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Moulding Machine Maximum Flow Rate Oct 24, 2017

On the full press, all movements are performed by a brushless synchronous motor with permanent magnets. Through the machine tool industry has been used in the ball bearing screw, the rotary motion into a linear motion. The efficiency of the entire process depends in part on the plasticizing process, Moulding Machine where the screw is very critical. The latest solution for Mitsubishi's production of all-motor models includes a filament screw (the second thread swivel) and a screw tip with a mixing element. In this way, can maximize the plasticizing ability and mixing effect, shorten the screw length, to achieve high-speed operation.

The screw must ensure that the material melts and homogenizes. This process can be adjusted by means of back pressure to avoid overheating. The mixing element can not produce too high a flow rate, otherwise it will cause the polymer to degrade. Each polymer has a different maximum flow rate, Moulding Machine and if it exceeds this limit, the molecules will be stretched and the polymer backbone breaks. However, the focus is still in the injection and packing process to control the forward axial movement of the screw. Subsequent cooling processes, including internal stresses, tolerances and warping, are important to ensure product quality. This is all determined by the quality of the mold, especially when optimizing the cooling channel to ensure effective closed-loop temperature regulation. The system is completely independent and does not interfere with mechanical adjustment. Mold movement such as mold clamping and ejection must be accurate and efficient. The velocity profile is usually used to ensure that the moving parts are close. Contact maintaining force can be adjusted. It can therefore be concluded that the quality of the product is determined primarily by the system that controls the forward movement of the screw without regard to energy consumption and mechanical reliability, with the same conditions (eg mold quality). In the hydraulic injection molding machine, this regulation is achieved by detecting the oil pressure. Specifically, the oil pressure through the control panel to activate a set of valves, Moulding Machine fluid through the manipulator and produce a role, and be adjusted and released.

Injection speed control includes open-loop control, semi-closed-loop control and closed-loop control options. The open-loop system relies on a shared proportional valve. The proportional tension is applied to the desired proportion of the fluid, causing the fluid to generate pressure in the injection barrel and allowing the injection screw to move at a certain forward speed. Semi-closed-loop system uses closed-loop proportional valve. Moulding Machine The loop is closed at the position where the closure is closed, and the closure port controls the flow rate of the oil by moving within the valve. The closed-loop system is closed at the screw translation speed. Closed-loop system uses a speed sensor (usually a potentiometer type), timing detection of tension drop. The proportional valve out of the oil through the adjustment, can compensate for the speed deviation. Closed-loop control relies on a dedicated electronic component integrated with the machine. Closed-loop pressure control ensures uniform pressure during injection and containment, Moulding Machine as well as ensuring uniform pressure in each cycle. The proportional valve is adjusted by the detected pressure value, and the deviation is compensated according to the set pressure value. In general, hydraulic pressure can be monitored, but the detection of melt pressure in the nozzle or cavity is another effective method. A more reliable solution is managed by reading the nozzle or cavity pressure readings proportional valve. Moulding Machine In the pressure detection based on the increase in temperature detection, in particular, is conducive to process management. Understanding the actual pressure on the material can also help to predict the actual weight and size of the molding according to the set pressure and temperature conditions. In practice, by changing the barometric pressure value, more material can be introduced into the mold cavity to reduce component shrinkage, conforming to design tolerances (including preset injection shrinkage). Near the melting conditions, the semi-crystalline polymer exhibits a large specific volume change. In this regard, overfilling does not prevent the parts from erecting.