Oil pump gear shaft precision-forging forming mold and forming method

Abstract

The invention belongs to the technical field of machining of gear shafts and discloses a female mold layered type oil pump gear shaft precision-forging forming mold structure and a forming method. The mold structure mainly comprises an upper mold, an upper layer of a lower mold, a tooth profile mold, a lower layer of the lower mold, a base, an outer ring of the lower mold, a pressing ring and a demolding ring. A mold cavity is divided into three layers, namely the upper layer of the lower mold, the tooth profile mold and the lower layer of the lower mold, which are used for forming of two lateral shafts and the tooth profile of a gear shaft respectively. The oil pump gear shaft precision-forging forming method comprises the three steps of bar heating, wherein only the part, for tooth profile forming, of metal, namely the middle section of a bar is heated; gear shaft precision-forging, wherein the upper lateral shaft, the lower lateral shaft and the tooth profile of the gear shaft are formed in a one-shot mode; mold stripping, wherein a forge piece is separated from the tooth profile mold after forging. Due to the fact that rough machining of the body and tooth profile of the gear shaft is achieved through three steps only, machining efficiency is high, materials are saved, and production cost is low. The female mold layered structure is compact, the shapes of parts of the mold are simple, and machining cost is low.

Description

technical field [0001] The invention belongs to the technical field of gear shaft processing, and provides a die structure and a forming method for precision forging forming of a concave die layered oil pump gear shaft, which are used for precision forging production of the oil pump gear shaft. Background technique [0002] Gear oil pumps are widely used in devices such as liquid transportation and hydraulic systems. The gear shaft in the oil pump is a basic part commonly used in mechanical structures. Gear pump gears are usually not standard gears. Gear pump gears have a large coefficient of variation and a high The tooth top is high. In order to adapt to the characteristics of compact size and high alignment accuracy of the gear pump, the gear of the gear pump is generally machined as a whole with the gear and the shaft. At present, the gear processing technology generally starts with hot forging to form the tooth blank, and the tooth shape is completed by cutting process...

AI Technical Summary

Problems solved by technology

Using cutting technology to produce gears, the processing time is long, the production efficiency is low, and the production cost is high.

At the same time, the cutting process will destroy the fiber structure of the metal, so the bending fatigue strength of the gear tooth, the contact fatigue strength and wear resistance of the tooth surface, and the service life will all be reduced, and the utilization rate of cutting materials is low and the energy consumption is high.

Images