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125 motorcycle engine starting gear cold extrusion forming method and dies thereof

A technology for engine start-up and extrusion dies, which is applied in the direction of metal extrusion dies, etc., can solve the problems of not being able to adapt to the processing of specific gear products, and achieve the effects of good product quality consistency, high work efficiency, and low processing costs

Inactive Publication Date: 2009-09-16
张长国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also cold extrusion methods for gear processing, but most of them cannot adapt to the processing of specific gear products, and the processing of specific gear products requires specific molds and specific processing methods to complete.

Method used

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  • 125 motorcycle engine starting gear cold extrusion forming method and dies thereof
  • 125 motorcycle engine starting gear cold extrusion forming method and dies thereof
  • 125 motorcycle engine starting gear cold extrusion forming method and dies thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , figure 2 , image 3 , Figure 4 , a kind of 125 motorcycle engine starting gear cold extrusion molding method, comprises the following steps:

[0037] a), blanking

[0038] Cut a metal bar with a specified diameter to a specified height to form a billet;

[0039] b), cold extrusion starting gear blank

[0040] see figure 1, put the blank on the middle mold cavity of the blank extrusion mold, start the hydraulic piston on the hydraulic press, the pressure head of the blank extrusion mold goes down, and press the blank in step a into the middle mold cavity of the blank extrusion mold In the process, the blank is extruded into the upper tooth blank and the lower keyway blank of the 125 motorcycle engine starting gear in the middle mold cavity, and at the same time, the cylindrical convex head at the lower end of the indenter presses the upper end of the blank out of the upper center blind hole, The lower end of the billet is pressed out of the lower ...

Embodiment 2

[0047] see figure 1 , figure 2 , a cold extrusion device for realizing the above-mentioned 125 motorcycle engine starting gear cold extrusion molding method, including a hydraulic press with upper and lower oil cylinders and a die, characterized in that: the die includes a blank extrusion die 1 and teeth and keyways The extrusion die 2, the blank extrusion die 1 and the tooth and keyway extrusion die 2 are respectively installed on a hydraulic press with upper and lower oil cylinders;

[0048] see figure 1 , the blank extrusion die 1 mold includes a cylindrical pressure head 11, a middle mold 12, a lower mold 13, and a push plate 14. The flange 111 of the pressure head 11 is fixedly connected with the piston of the upper cylinder of the hydraulic press, and the lower end of the pressure head 11 A cylindrical protruding head 112 is provided, the diameter of the indenter 11 is the same as that of the tooth blank on the upper part of the gear blank, and the diameter of the cyl...

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Abstract

The invention discloses a 125 motorcycle engine starting gear cold extrusion forming method. The method comprises the following steps: a) charging materials; b) carrying out cold extrusion on a starting gear blank; c) carrying out cold extrusion on gears and keyways of the starting gear so as to form a starting gear finished blank; and d) carrying out the finish turning on the starting gear. A cold extrusion device comprises a hydraulic press with upper and lower oil cylinders and dies. The dies comprise a blank extrusion die and a gears and keyways extrusion die which are arranged on the hydraulic press with the upper and lower oil cylinders respectively. The 125 motorcycle engine starting gear cold extrusion forming method adopts the two-step formation integrated with subsequent processing, saves raw materials, and has high work efficiency, low processing cost and good quality uniformity of products. The cold extrusion forming dies have novel design and a reasonable structure, and meet the requirements of the 125 motorcycle engine starting gear cold extrusion forming method.

Description

technical field [0001] The invention relates to a method for manufacturing motorcycle engine spare parts, in particular to a cold extrusion forming method and mold for a 125 motorcycle engine starting gear. Background technique [0002] At present, the traditional method for the production of 125 motorcycle engine starting gears is to adopt the method of cutting and processing, first blanking, and then cutting or extruding to produce the blanks of starting gears, and use a lathe to process the shape and center hole of the starting gears , The tooth shape and keyway of the starting gear are processed by a milling machine or a gear shaping machine. This production method wastes materials, has low work efficiency and high manufacturing cost. Even if the CNC lathe is used for processing, although the production efficiency can be improved, the above problems still exist. At present, there are also cold extrusion methods for gear processing, but most of them cannot adapt to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C23/21B21C25/02
Inventor 张长国
Owner 张长国
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