Method for forging compound forming of large-tooth-height worm and radial forging die

Abstract

The invention discloses a method for forging compound forming of a large-tooth-height worm and a radial forging die. The method comprises the following steps that firstly, a basic worm thread tooth profile is obtained by using a radial forging method, then, rolling is used for correcting a tooth profile deviation caused by the two aspects of factors of a difference between radial forging die innerthread parameters and thread parameters of a finished worm, and warm forming machining precision in a radial forging process, and finally, the tooth profile of the worm is strengthened. The radial forging die is composed of a plurality of split dies with the same shape, and threads of the inner surfaces of the plurality of split dies can be spliced to form a complete thread shape. The method canmachine the thread tooth profile of the worm with the high tooth height, improve the production efficiency, shorten the production period, increase the surface strength of a part, and improve the reliability of the part.

Description

technical field [0001] The invention belongs to the technical field of worm forming, and in particular relates to a method for forming a large-tooth-height worm combined with forging and rolling and a radial forging die. Background technique [0002] Worm drives primarily consist of a worm wheel and a worm used to transmit force and motion between two interleaved shafts. Compared with gear transmission, worm transmission has the advantages of large transmission ratio, compact structure size, stable operation, low noise, and can obtain transmission reverse stroke self-locking without other auxiliary mechanisms. There are a wide range of applications in the device. [0003] At present, worm production adopts cutting method or plastic forming method. The cutting method destroys the original metal fiber, reduces the strength of the material, and also has the disadvantages of low material utilization rate and high processing cost. The main plastic forming method of worms is ro...

AI Technical Summary

Problems solved by technology

The Chinese patent with the application number 201410216065.X discloses a method of radially forging and incrementally forming large-tooth-height screw parts with axial feed of the blank. However, this method is used to form worm parts with a small axial length of the thread section , prone to obvious axial elongation of the worm, interference between the mold and other positions of the worm shaft, poor forming quality at both ends of the thread, etc.

The Chinese patent with the application number 201410218696.5 discloses a method of radial forging without axial feeding of blanks to form progressively incrementally formed threaded parts. However, the tooth height of the worm parts formed by this method is large, and the diameter of the pitch When it is relatively small, because the tooth shape of the mold is the conjugate tooth shape of the tooth shape of the target part, each time the hammer is struck, the tooth tip circle in the mold first contacts the workpiece to be formed, because the diameter of the tooth tip circle in the mold is smaller than that before forming If the diameter of the billet is small, it is easy to cause problems such as material folding and tooth shape damage during forming.

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