Pulling teeth refers to the process of machining a gear ring using a formed puller, usually straightening the teeth. On the other hand, the corresponding rotary cutting method involves cutting the workpiece while the cutting tool rotates during machining. Lapping technology is generally applied in the precision technician industry, and it has more advantages for high-quality production and processing.
A machete is like a saw, and the height of the teeth on it is constantly changing. The puller is divided into three sections: the first section is rough machining, the second section is semi precision machining, and the last section is precision machining. The shape of the processed part is determined by the tooth profile of the puller, and the increase in height between adjacent teeth can be considered as the feed rate, which determines the amount of each cutting. All processing is ensured by a puller, without any other special processing steps. But the final effect produced by using a puller is similar to the effect produced by using gear inserts for multiple processing.
The process of pulling teeth is to use a fixture to send the workpiece to a designated workstation, then the lathe lifts the puller above the workpiece, and then presses the puller down through the workpiece. When one end of the puller passes through the workpiece, there is a claw under the puller that grips the end of the puller and pulls it downwards, allowing the puller to completely pass through the workpiece. Finally, the processed workpiece is removed and the puller is lifted to the highest position to reset.
Due to the fact that the workpiece is formed through a single machining process, the design of the puller must comply with the size and accuracy requirements of the part.
The materials that can be processed with a puller include alloy steel (42CrMo, 20CrMn, 31CrMoV9, 40Cr, 50Mn...) and cast iron.
Why rotate the teeth? The reasons are threefold:
• Time saving: Compared to gear hobbing, gear hobbing saves 40% -60% of time and ensures a higher level of quality. For some parts, it can even process multiple parts at once;
• Stable quality: During tooth pulling processing, there is no excessive human involvement, reducing the impact of human factors and ensuring long-term stability of product quality;
• Cost reduction: Shortening time means reducing costs, and improving quality levels will also lead to cost reductions in final assembly for customers;
