A kind of modification processing method of plastic toothed drum gear
A processing method and drum-shaped technology, applied in the field of gear processing, can solve the problems of meshing impact, forming error, manufacturing error, etc., and achieve the effects of reducing gear transmission noise, improving tooth surface lubrication, and uniform load distribution.
Active Publication Date: 2022-03-11
HENAN UNIV OF SCI & TECH
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Problems solved by technology
However, the development of plastic gears in China started relatively late, and the relevant design requirements of hardware gears are still used for design and processing, which cannot meet the actual production requirements.
Due to the molding error of plastic gears caused by factors such as holding pressure, injection pressure, and temperature during the molding process, and the plastic gear itself will shrink, resulting in manufacturing errors, it will cause meshing impact during the transmission process of the gear box, resulting in unstable transmission. noise
Method used
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Embodiment 1
[0043] Ordinary gear blank processing can be directly completed by using conventional hobs to make electrodes first and then conduct electrical discharge machining. The tooth direction drum-shaped tooth blank is a displacement electrode, which cannot be produced by conventional hobs, so a five-axis CNC gear hobbing machine is used to process the tooth direction. For drum-shaped electrodes, if it is required that the tooth thickness at the maximum position of the drum shape of the Seiko mold is 1.85, the tooth thickness of the minimum position of the drum shape of the Seiko mold core is 1.75, and the drum shape △ is 0.05mm, the processing method is as follows:
[0044] 1. Use a conventional hob to process a 1.40 thick male electrode without a drum, and then perform electrical discharge machining on a cremation machine. The single-side spark position C0=0.15, and process a rough tool core with a thickness of 1.4+(0.5*2)=1.70 teeth. Such as image 3 shown on the left;
[0045]2....
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A method for modifying and processing plastic toothed crowned gears, comprising the following steps: step 1, confirming the crowning amount of toothed crowned gears according to the conventional design method for toothed crowned gears; The drum-shaped rough male electrode is made with a knife, and the rough EDM is processed on the spark machine to make the rough mold core; step 3, the drum-shaped fine male electrode is processed by a five-axis CNC gear hobbing machine, put into the rough mold core, and then the precision discharge is performed, according to Process the drum-shaped quantity to produce a precision mold core; step 4, perform injection molding with the precision mold core, and use the forced release method to release the mold to obtain a plastic toothed drum-shaped gear. The copper tool and die core used in the mold are used comprehensively to process the tooth drum shape, improve the lubrication state of the tooth surface, obtain a more uniform load distribution, increase the bearing capacity, and reduce vibration and noise.
Description
technical field [0001] The invention relates to gear processing technology, in particular to a method for modifying and processing plastic toothed drum gears. Background technique [0002] With the development of micro-gear transmission systems, plastic gears are gradually replacing metal gears due to their advantages of low cost and high molding efficiency, and are widely used. However, the development of plastic gears in China started relatively late, and the relevant design requirements of hardware gears are still used for design and processing, which cannot meet the actual production requirements. Due to the molding error of plastic gears caused by factors such as holding pressure, injection pressure, and temperature during the molding process, and the plastic gear itself will shrink, resulting in manufacturing errors, it will cause meshing impact during the transmission process of the gear box, resulting in unstable transmission. noise. Contents of the invention [...
Claims
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IPC IPC(8): B29C33/38B29C45/26
CPCB29C33/3842B29C45/26
Inventor 杨宏斌李静李瑞怡徐爱军
Owner HENAN UNIV OF SCI & TECH