Long shaft gear precise forming device with boss

Abstract

The invention provides a long shaft gear precise forming device with a boss. The precise forming device comprises an upper mold closing mold assembly, a lower mold closing mold assembly, a left extrusion mold assembly and a right extrusion mold assembly which are installed on a four-direction forming press together. By means of the long shaft gear precise forming device, a long shaft gear forgingblank with the boss can be integrally formed through single-pass hot forging, and a spoke and the long shaft boss can be formed at the same time; the device solves the problem that mold stripping of aforge piece is difficult, and the disadvantages of split forming or multi-pass forming are avoided; by means of the device, the spoke part can be formed, reasonable forging streamline distribution isreserved, the mechanical performance of the part can be effectively improved, and meanwhile no-flash forging of the part is achieved; metal materials can be saved, and the material utilization rate can be increased; and meanwhile, the machining allowance of forge piece products is small, and the subsequent machining cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of pressure processing of metal parts, and in particular relates to a long-axis gear precision forming device with a boss. Background technique [0002] Long shaft gears with bosses are mostly used in transmissions of heavy and medium-sized trucks and buses. They are important parts for transmitting torque in the transmission. The rigidity and strength of this part have a great influence on the transmission performance. If the mechanical properties of the parts are not up to standard, broken shafts or broken teeth will cause serious safety accidents. The current commonly used processing method for this part is to design it as a split structure. The long axis part with the boss and the part with the spoke sprocket are forged separately, and welded for use after machining. The parts manufactured by this method are welded parts are prone to failure. If the part is forged as a whole structure, since there is a...

AI Technical Summary

Problems solved by technology

[0002] Long shaft gears with bosses are mostly used in transmissions of heavy and medium-sized trucks and buses. They are important parts for transmitting torque in the transmission. The rigidity and strength of this part have a great influence on the transmission performance. If the mechanical properties of the parts are not up to standard, broken shafts or broken teeth will cause serious safety accidents

The current commonly used processing method for this part is to design it as a split structure. The long axis part with the boss and the part with the spoke sprocket are forged separately, and welded for use after machining. The parts manufactured by this method are welded parts prone to failure

If the part is forged as a whole structure, since there is a boss at the long axis, and a disc tooth with spokes is set at one end of the long axis, generally speaking, the common open die forging method and closed upsetting extrusion method are used. It is difficult to form the bosses and spokes on the long axis at the same time, because this structure makes it difficult for the forging to be released from the mold. Now it is only possible to forge the rough shape and then rely on mechanical turning to form the bosses and spokes of the long axis. Such processing This method cannot retain a reasonable forging streamline, because the forging streamline is cut off by mechanical turning, the mechanical properties of the parts are also greatly reduced, and the metal waste is also very serious

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