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Plastic injection molding

2017-12-29

the injection mould is divided into two parts , namely , an injection mould , a blow mould , a casting mould , a hot forming die , a hot pressing die ( compression mold ) , an injection mould and the like , wherein the injection mould is divided into two parts , namely an overflow type , a semi - overflow type and an injection mould , The closure forms the gating system and the mold cavity, and the moving and fixed modes are separated to remove the plastic products.


Although the plastic mould structure and performance of varieties, different shape and structure and the type of injection molding machine of plastic products and the myriads of changes, but the basic structure is the same. Mainly by pouring system, temperature control system of mold, molding parts and structural parts. The gating system and molding parts are in direct contact with the plastic parts and change with plastics and products, is the most complex in the mold, the biggest change, some processing smoothness and the highest precision.


The casting system refers to the flow channel portion of the plastic from the nozzle to the front of the cavity , including the main flow channel , the cold material cavity , the shunt channel and the gate , etc . The forming part refers to various parts that make up the shape of the product , including the movable die , the fixed die and the cavity , the core , the shaping rod and the exhaust port.


Solutions


Mold Maintenance


1, the first processing enterprises should be equipped with card, for every pair of moulds with statistical records, the use of care (lubrication, cleaning, rust proof) and damage, which can find out what parts and components have been damaged, the wear degree of size, to provide information to discover and solve problems, and the mold molding process parameters and the materials used in products, to shorten the test time, improve the production efficiency.


2. Under the normal operation of injection molding machine and mould, the processing enterprise should test the various properties of the mould, and measure the size of the final molded part. Through these information, we can determine the current state of the mould and find out the cavity. The damage of mould core, cooling system and parting surface can be judged according to the information provided by plastic parts.


3. Several important parts of the mould should be tracked: the function of the ejection and guiding parts is to ensure the opening and closing movement of the mould and the ejection of the plastic parts, if any part of the parts is stuck because of the damage, the production will be stopped. Therefore, we should always maintain the lubrication of the die thimble and guide post (choose the most suitable lubricant, and check whether the thimble, guide post and so on have deformation and surface damage, once found, should be replaced in time; " After the completion of a production cycle, the working surface, movement and guide parts of the die should be coated with professional antirust oil, especially the protection of the elastic strength of the bearing parts with gears, rack dies and spring dies, so as to be sure As the production time is continuous , the cooling channel is easy to deposit scale , rust , sludge and algae , so that the cross section of the cooling flow channel becomes smaller , the cooling channel is narrowed , the heat exchange rate between the cooling liquid and the mold is greatly reduced , the production cost of the enterprise is increased , and therefore , the heating and control system maintenance is beneficial to preventing the occurrence of the production failure , Compare with the mold resume, make a good record, in order to timely find the problem and take countermeasures.


4. we should pay attention to the surface maintenance of the mould, which directly affects the surface quality of the product, and the emphasis is to prevent corrosion. Therefore, it is very important to select a suitable, high quality and professional antirust oil. When the mold completes the production task, it is very important to select a suitable, high quality and professional antirust oil. Different methods should be taken to carefully remove residual injection molds according to different injection molds. Copper rods, copper wires and professional mould cleaning agents may be used to remove residual injection molds and other deposits in the mold, and then air-dried. No wire shall be allowed. Clean up hard objects, such as steel bars, to avoid scratching the surface. If there are rust spots caused by corrosive injection molding, use a grinder to grind and polish, spray professional rust prevention oil, and then place the mold in a dry, cool, dust-free place Store in .


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