The utility model provides a tooth plate mold for producing an anti-broken head screw, comprises a static tooth plate and a moving tooth plate, and the static tooth plate is installed In the static mold groove, the moving tooth plate is installed in the moving mold groove,and the static tooth plate and the moving tooth plate have mutually adapted tooth rubbing, and the static tooth plate and the moving toothThere is a gap for the screw blank to pass through between the plates, and the tooth rubbing is located on the working surface of the static tooth plate and the moving tooth plate, and the tooth rolling is provided with a plurality of strips, And along the working face in order, the teeth are parallel to each other, and the axial direction of each tooth and the static tooth plate and the moving tooth plate is at a certain angle; situatedThe tooth rolling of the thread end end section has a chamfering section, and the chamfering section is located at the feed end of the tooth rolling, and the tooth arc of the chamfering section is notThe break becomes larger, the height continues to rise, until it is smoothly connected with the tooth rubbing, and the thread of the screw closing section is rubbed by the closing chamfering section.The bottom of the thread closing section is constantly raised, and the center is constantly thickened, so as to increase the strength of the connection between the thread section and the screw head, and avoidAvoid breakage during installation and disassembly.

Technical field

The utility model relates to screw production technology, in particular to a tooth plate mold for producing anti-broken.

screws.Background technology

In the process of equipment assembly and repair, due to excessive force when assembling or disassembling corroded screws, etc.,the screws may be twisted, so that a part of the stud remainsIt is not easy to take out the equipment, which affects the follow-up work. In order to prevent this from happening, it is necessary to improve the structure of the screw, and the commonly used thread rolling tooth plate mold It is difficult to meet the requirements. Therefore, it is necessary to optimize the structure of the tooth plate mold to overcome the above defects.

Utility model content

An object of the utility model is to provide a tooth plate die for producing an anti-broken head screw, which is convenient for processing the anti-broken head screw.The utility model discloses a technical scheme adopted for solving its technical problem is: a dental plate mold for producing an anti-broken screw comprises a static tooth plate and a moving tooth plate, a static tooth The plate is installed in the static mold groove, and the moving tooth plate is installed in the moving mold groove, and the static tooth plate and the moving tooth plate have the tooth rubbing that matches each other, and the static tooth plate and the moving tooth plate have a supply The gap through which the screw blank passes, wherein: the tooth rubbing is located on the working face of the static tooth plate and the moving tooth plate, and the tooth rubbing is provided with a plurality of strips, and is arranged in sequence along the working face, and the teeth are rubbed Parallel to each other, each tooth rubbing is at a certain angle with the axial direction of the static tooth plate and the moving tooth plate;The tooth rolling that is located at the end of the thread has a chamfering section, and the chamfering section is located at the feeding end of the tooth rolling, and the tooth arc of the chamfering section is constantly increasing, and the height is notThe break is raised until it is smoothly connected with the tooth rubbing, and the thread of the screw end section is rubbed by the chamfering section.In an embodiment of the present invention, the closing chamfering segment comprises a first chamfering section, a second chamfering segment and a 3rd chamfering segment, a first chamfering segment and a second chamfering segmentand the length of the third chamfering section is one-third of the total length of the closing chamfering section respectively, and the length of the first chamfering section, the second chamfering section and the third chamfering section is one respectively The length of the coil thread. Specifically, the top surface height of the closing chamfering section of the adjacent rolling teeth is continuously reduced, and is located on the same straight line, and the angle between the straight line and the working face is5°～45°。

The advantages of the utility model are that:

The tooth plate mold can be processed with an anti-broken screw, and the blank enters between the static tooth plate and the moving tooth plate, and the first chamfering section, the second chamfering section and the third chamfering section are respectively Rub a circle of threads, so that the bottom of the thread end section continues to rise, and the center continues to thicken, so as to increase the strength of the connection between the thread section and the screw head, to avoid inBroken ends occur during installation and disassembly.