Method to prevent heat treatment deformation of customized gear rack products
First, the deformation caused by the rough toothing of the customized gear rack products and after the stress release before heat treatment is tested, and the appropriate machining allowance is selected according to the deformation.
Customized gear rack products are a kind of gear transmission parts. Under normal circumstances, the blank of fan-shaped customized gear rack products is forged into a whole ring before gear milling, and heat treatment is performed as a whole. After heat treatment to reduce stress, the forging ring blank is reserved for processing according to each process of the ring gear. The fan-shaped shape is turned on the vertical lathe. In order to prevent deformation, the stress-relieving aging treatment is required after the turning is completed, and then it is cut according to the actual size of the pattern to become a single inclined customized gear rack products, and then the teeth are milled.
The equipment does not meet the overall rough quenching and tempering requirements of the entire ring gear. In order to save material and processing costs, on the premise of maintaining the hardness of the gears, a suitable form of heat treatment is selected to prevent deformation, so that the stress can be released evenly during and after heat treatment. , the deformation is small, which is one of the difficulties of the processing. To this end, we decided to adopt the process method of forging, machining and heat treatment of single customized gear rack products to ensure the quality of machining.
First, the deformation caused by the rough toothing of the customized gear rack products and after the stress release before heat treatment is tested, and the appropriate machining allowance is selected according to the deformation. The selection of the margin is: after roughing the teeth, quenching and tempering, leaving 8mm margin on each side of the tooth side, 25mm margin on the bottom of the tooth, 16mm on each side of the outer circle, and 40mm and 15mm margin on the upper and lower ends of the web respectively. , to ensure that once the deformation occurs, there is enough machining allowance to compensate for the deformation, which provides a guarantee for the subsequent processing of customized gear rack products.