Why? injection molding machine Frequent fracture of formwork? To say which part of the injection molding machine is more important, the template must bear the brunt. Template is an important part of injection molding machine. It can be said that if there is a problem with the template, the injection molding machine will not work normally. Therefore, in order to strengthen the rigidity of the template, the injection molding machine manufacturer has fully considered this situation. However, the template breaks from time to time. What is the reason?

1、 Force analysis of injection molding machine template

In the elbow type clamping device, for the front injection molding machine template, its force is like wrapping something with a handkerchief. It should be noted that if the middle hollowing is too large, or there are casting defects, screw holes, pin holes and other defects near the axisymmetric line, there is a risk of fracture.

2、 System stress analysis

1. When pulling the lever to straighten, four pull rods must be pulled; Due to processing and assembly, the length of four pull rods may be different, so the pulling force is different, and the force acting on the injection molding machine template is also different; This is easy to cause local overload and fracture of the injection molding machine template.

2. Also due to processing and installation reasons, such as unequal length of elbow bar on both sides, unequal length of four pull rods, uneven thickness of injection molding machine template, and even non parallel mold mounting surface, elbow bar will become straight; The strength is different. During rigid mold closing, if the initial angle formed by the upper and lower elbow rods is different, it will inevitably cause uneven force on the elbow rods, which can reach more than 30% in serious cases, and the mold stress will also increase. Inhomogeneous; This will cause the mold to contact the injection molding machine template. As the area decreases, the bending force increases, which will inevitably lead to uneven force and fracture of the injection molding machine template.

3、 Arrangement of timing bar and installation of die

1. The elbow rod is mainly divided into two types: up and down arrangement or horizontal arrangement; The manufacturer of Liansheng injection molding machine believes that if the lubrication factor is not considered, only the convenience of the mold is considered, which is generally H1 ≥ H2, so the length of the rear elbow bar can be considered to be longer when the horizontal arrangement is adopted to increase the travel of the injection molding machine template. In this way, if the strip mold is used, the mold width B is much smaller than L1, the dynamic injection molding machine template is relatively easy to fracture; Of course, if the mold is arranged up and down, flash is easy to appear near the horizontal axis of the mold, and the mold opening stroke is small.

2. The installation area of the mold is too small, which greatly increases the bending force of the injection molding machine template, and the injection molding machine template is also easy to break.

Thank you for your reading. I believe you will understand after reading the introduction of the above articles High speed injection molding machine The reason for the fracture of the template has been prevented. If you need to or do not know anything, you can pay attention to our official website or call us. The company will have special personnel to answer your questions.