The application of steel wire thread insert (braces) in the repair of injection molding machine template

The application of steel wire thread insert (braces) in the repair of injection molding machine template

Wire thread insert (braces) is a new type of threaded fastener, which can form a high precision internal thread in line with international standards after loading into the product, and its performance is better than the thread formed by direct tapping. With the role of wire thread insert gradually recognized by enterprises, its application scope has been more and more extensive. The steel wire thread insert is used to repair the damaged inner screw thread, as a kind of thread repair means, the damaged thread can be repaired quickly and effectively. Because the steel wire thread insert has the above advantages, it has a typical application in the repair of the thread hole of the injection molding machine template and the repair of the thread hole of the automobile engine cylinder block. The following focuses on the application of the thread insert in the repair of the thread hole of the injection molding machine template. Please refer to the installation of wire thread insert for specific use. There are many thread holes used to press the mold on the injection machine head plate and the second plate. After using for a period of time, the situation of screw sliding wire occurs from time to time. Usually, the method of maintenance is to increase the thread hole by one level, that is, to select the drill hole according to the bottom hole of the large thread, and then tap, and configure the large pressure plate and bolt.

Generally, the use of more frequent thread holes is prone to damage, and there may be repeated expansion of the slide wire after repair by the above method. There are generally two reasons for the thread hole slip: first, the effective depth of the bolt screwed into the thread hole is too shallow, so that the thread is subjected to strong shear force and failure; Another possibility is that there are flash burrs or dirt on the thread of the bolt, or dirt is entered into the thread hole, and the thread hole is scratched when the bolt is screwed in to accelerate the wear of the thread surface, slowly reducing the shear resistance until it is destroyed. In view of the above situation, the best way is to use the installation wire thread insert, which can improve the connection strength of the repaired thread hole. The specific operation method is to reexpand the threaded hole of the slide wire, the aperture is larger than the nominal diameter of the original thread hole (please refer to the specifications of the wire thread insert for drill selection), the depth is equivalent to the original hole, and the special tap is used to tap, and then screw into the mouthpiece with the same nominal diameter of the original thread hole. The outer thread of the mouthpiece is glued to the matrix thread hole by elastic tension force, and the inner thread is the same as the original thread hole specifications, only the material of the thread is replaced by stainless steel ductile iron, and the steel to steel connection after the bolt is screwed into the thread hole greatly improves the mechanical properties of the thread.