Injection molding machine head overflow solution Inject […]
Injection molding machine head overflow solution
Injection molding machines are also known as injection molding machines or injection machines. It is the main molding equipment for thermoplastic or thermosetting plastics using plastic molding dies to make plastic products of various shapes. Divided into vertical, horizontal, all-electric. The injection molding machine heats the plastic and applies a high pressure to the molten plastic to eject it to fill the mold cavity.
The role of the injection system: the injection system is one of the most important components of the injection molding machine, generally there are three main forms of plunger type, screw type, screw pre-plastic plunger injection type. Currently the most widely used is the screw type. The function is that, in a cycle of the injection molding machine, a certain amount of plastic can be plasticized and plasticized in a predetermined time, and the molten plastic is injected into the mold cavity through the screw at a certain pressure and speed. After the injection is completed, the melt injected into the cavity is kept set.
Composition of the injection system: The injection system consists of a plasticizing device and a power transmission device.
The plasticizing device of the screw type injection molding machine is mainly composed of a feeding device, a barrel, a screw, a glue assembly and a nozzle portion. The power transmission device includes an injection cylinder, an injection base moving cylinder, and a screw drive device (melt motor).
The role of the clamping system: The function of the clamping system is to ensure that the mold is closed, opened and ejected. At the same time, after the mold is closed, the mold is supplied with sufficient clamping force to resist the cavity pressure generated by the molten plastic entering the cavity, preventing the die from being slit, resulting in a bad condition of the product.
The composition of the clamping system: the clamping system is mainly composed of a clamping device, a machine clamping, a mold adjustment mechanism, an ejection mechanism, a front and rear fixed template, a moving template, a clamping cylinder and a safety protection mechanism.
The function of the hydraulic transmission system is to realize the injection molding machine to provide power according to various actions required by the process, and to meet the requirements of pressure, speed and temperature required for each part of the injection molding machine. It is mainly composed of hydraulic components and hydraulic auxiliary components, of which oil pump and motor are the power source of injection molding machine. Various valves control oil pressure and flow to meet the requirements of the injection molding process.
The electrical control system and the hydraulic system can be reasonably matched to realize the process requirements (pressure, temperature, speed, time) of the injection machine and various schematic diagrams of the program actions. Mainly composed of electrical appliances, electronic components, meters (see the bottom right), heaters, sensors and so on. There are generally four control modes, manual, semi-automatic, fully automatic, and adjustment.
The heating system is used to heat the barrel and the injection nozzle. The barrel of the injection molding machine generally uses a heating coil as a heating device, is installed outside the barrel, and is detected by a thermocouple. The heat is provided by the heat conduction of the tube wall to provide heat source for plasticizing the material; the cooling system is mainly used to cool the oil temperature, and the oil temperature is too high, which may cause various faults, so the oil temperature must be controlled. Another location that needs to be cooled is near the feed opening of the feed pipe to prevent the raw material from melting at the feed opening, resulting in the raw material not being properly cut.
The lubrication system is a circuit that provides lubrication conditions for the movable parts of the injection molding machine, the mold adjustment device, the hinge of the connecting rod, the shooting table, etc., so as to reduce the energy consumption and improve the life of the parts. The lubrication can be periodic manual lubrication. It can also be automatic electric lubrication;
The safety device of the injection molding machine is mainly used to protect people and machines. Mainly composed of safety door, safety baffle, hydraulic valve, limit switch, photoelectric detection component, etc., to achieve electrical-mechanical-hydraulic interlock protection.
The monitoring system mainly monitors the oil temperature, material temperature, system overload, and process and equipment failure of the injection molding machine, and indicates abnormal conditions for indication or alarm.
Flash is also called flash edge, overflow edge, cloak, etc., mostly occurs in the mold score and position. Such as: the parting surface of the mold, the sliding part of the slider, the gap of the insert, the aperture of the ram, and the like. If the flash is not resolved in time, it will be further enlarged, so that the stamping die forms a local collapse and causes permanent damage. The gap between the insert gap and the ejector pin also causes the article to get stuck on the mold, affecting demolding.