JP2005103601A5 - - Google Patents

Claims (14)

In the method of manufacturing a tooth profile part by cold forging, the initial tooth profile tooth thickness by cold forging between the initial process of forming the initial tooth profile by cold forging and the completion process of forming the completed tooth profile by sizing. The tooth thickness is maintained substantially the same as that of the initial tooth profile, or the tooth thickness is decreased within a range of 10% or less than the initial tooth profile, and at the same time, an intermediate process of projecting the tooth tip from the initial tooth profile is interposed. A method for manufacturing tooth profile parts by cold forging. According to claim 1 on both sides of the rounding of the tooth bottom in the initial tooth profile being larger than both sides of the rounding of the tooth bottom in the finished tooth profile method of tooth profile part by cold forging. In the intermediate process, the tooth thickness is kept the same or decreased, and at the same time, the tooth tip is protruded in a rounded manner by multiple cold forgings, approaching the shape of the tooth tip of the finished tooth profile according to any one of claims 1-2, characterized in that go method of tooth profile part by cold forging. Completed step at a guide portion provided on the mouth portion of the mold for finishing the length of the guide portion according to any one of claims 1 to 3, characterized in that more than half of the tooth width, cold A method for manufacturing tooth profile parts by hot forging. According to any one of claims 1 to 4, the thickness in the finished process and adjusting by sizing process the toothed so as to reduce 0.02 to 0.1 mm, the tooth profile part by cold forging Production method. From the formation of the initial tooth profile according to before sizing process to any one of claims 1 to 5, characterized by forming at 3-5 stage by parts Homer, manufacturing method of the gear by cold forging. Initial step and according to any one of claims 1 to 6, characterized in that the softening annealing treatment teeth between the intermediate step, the production method of tooth profile part by cold forging. Initial step and according to any one of claims 1 to 7, characterized in that the lubricating coating with processing teeth between the intermediate step, the production method of tooth profile part by cold forging.   In each of the multistage cold forging in the initial process and the intermediate process, the tooth tip of the workpiece tooth shape stops protruding before reaching the tooth tip of the mold tooth shape. The manufacturing method of the tooth profile part by cold forging of any one of Claims 1. According to any one of claims 1-9, Oite method of manufacturing a tooth profile part by cold forging, from the initial step to complete the process, it including intermediate step, all forging is cold forging Manufacturing method of tooth profile parts by cold forging characterized by this.   In the method of manufacturing tooth profile parts by cold forging, the initial tooth profile is almost the same as the initial tooth profile thickness by cold forging between the initial process of forming the initial tooth profile and the completion process of forming the completed tooth profile by sizing. Maintain the tooth thickness or reduce the tooth thickness from the initial tooth profile, and at the same time intervene an intermediate process that protrudes the tip of the tooth from the initial tooth profile, and the roundness on both sides of the root in the initial tooth profile is the completed tooth profile A method for producing a tooth profile part by cold forging, wherein the tooth shape is larger than the roundness on both sides of the tooth bottom in   In the method of manufacturing tooth profile parts by cold forging, the initial tooth profile is almost the same as the initial tooth profile thickness by cold forging between the initial process of forming the initial tooth profile and the completion process of forming the completed tooth profile by sizing. Maintain the tooth thickness or reduce the tooth thickness than the initial tooth profile, and at the same time, interpose an intermediate process that protrudes the tip of the tooth from the initial tooth profile, and at the mouth of the mold for finishing in the completion process A method for producing a tooth profile part by cold forging, characterized in that a guide part is provided, and the length of the guide part is made more than half of the tooth width.   In the method of manufacturing tooth profile parts by cold forging, the initial tooth profile is almost the same as the initial tooth profile thickness by cold forging between the initial process of forming the initial tooth profile and the completion process of forming the completed tooth profile by sizing. Maintain the tooth thickness or reduce the tooth thickness from the initial tooth profile, and at the same time intervene an intermediate process that protrudes the tip of the tooth from the initial tooth profile. A method for producing a gear by cold forging, which is formed in 5 stages and is subjected to a softening annealing process or a lubricating coating process immediately before sizing. In the method of manufacturing tooth profile parts by cold forging, the initial tooth profile is almost the same as the initial tooth profile thickness by cold forging between the initial process of forming the initial tooth profile and the completion process of forming the completed tooth profile by sizing. Maintain the tooth thickness or reduce the tooth thickness compared to the initial tooth profile, and at the same time intervene an intermediate process that protrudes the tip of the tooth from the initial tooth profile, and the multi-stage cold forging in the initial process and the intermediate process A method for producing a tooth profile part by cold forging, characterized in that, in each case, the tooth tip of the tooth profile of the workpiece is stopped from protruding before reaching the tooth tip of the tooth profile of the mold.