The forming process of the automatic zipper head machine
Generally, the molding process of the automatic zipper puller machine is: first add granular or powdered plastic into the barrel, and make the plastic into a molten state through the rotation of the screw and the heating of the outer wall of the barrel, and then the machine closes the mold and moves the injection seat forward , Make the nozzle close to the gate of the mold, and then pass pressure oil into the injection cylinder to push the screw forward, so as to inject the melt into the closed mold with a lower temperature at a high pressure and a faster speed. Hold for a certain period of time and pressure (also known as holding pressure) and cooling to make it solidify and form, then the mold can be opened and the product can be taken out (the purpose of holding pressure is to prevent the backflow of the melt in the cavity, replenish the material in the cavity, and ensure Products have certain density and dimensional tolerances). The basic requirements of injection molding are plasticization, injection and molding. Plasticization is the prerequisite for realizing and ensuring the quality of molded products, and in order to meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, a correspondingly high pressure is generated in the cavity (the average pressure in the cavity is generally between 20 and 45 MPa), so there must be a sufficient clamping force. It can be seen that the injection device and the clamping device are the key components of the injection molding machine.
There are three main aspects to the evaluation of plastic products. The first is the appearance quality, including completeness, color, gloss, etc.; the second is the accuracy of the size and relative position; the third is the physical properties, chemical properties, and Electrical performance, etc. These quality requirements are different depending on the use occasion of the product, and the required scale is also different. The defects of the product mainly lie in the design, manufacturing accuracy and degree of wear of the mold. But in fact, the technicians of plastic processing plants often suffer from the difficult situation of using technological means to compensate for the problems caused by mold defects without great results.
The adjustment of the process in the production process of the automatic zipper puller is a necessary way to improve the quality and output of the product. Because the injection molding cycle itself is very short, if the process conditions are not well mastered, there will be an endless stream of waste products. When adjusting the process, it is best to change only one condition at a time and observe a few more times. If the pressure, temperature, and time are all adjusted together, it is easy to cause confusion and misunderstanding. If there is a problem, I don’t know the reason. The measures and means to adjust the process are various. For example, there are more than ten possible solutions to the problem of product dissatisfaction. Only by choosing one or two main solutions to solve the problem can the problem be solved. In addition, attention should be paid to the dialectical relationship in the solution. For example, if the product has a depression, sometimes the material temperature must be increased, sometimes the material temperature must be lowered; sometimes the material quantity must be increased, and sometimes the material quantity must be reduced. It is necessary to recognize the feasibility of reverse measures to solve the problem.