Segmented Threading Insert Reduces Grinding Time
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Solution Overview
Problem
Existing cutting inserts for threading work require lengthy grinding processes, leading to high manufacturing costs and potential degradation in shape accuracy due to complex contour shapes and long cutting edges.
Innovation Solution
A cutting insert design featuring a rake face, flanks, and tooth-shaped cutting edges with a finishing cutting edge and a roughing cutting edge, where the second flank has a larger clearance angle than the first flank, allowing for reduced grinding time and costs without compromising shape accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting edge has a long length and complicated contour shape, then the shape accuracy of the screw to be processed is maintained, but the grinding time becomes excessively long
Solution Approach 1:
The cutting edge is segmented into multiple tooth-shaped cutting edges arranged in parallel, where each tooth has a simplified contour shape. This segmentation allows the grinding time to be reduced while maintaining the overall shape accuracy through the combined action of multiple teeth.
Solution Approach 2:
Different portions of the cutting edge have different functions: roughing cutting edges for material removal and finishing cutting edges for precision shaping. This local differentiation allows optimized grinding processes for each zone, reducing total grinding time while maintaining accuracy where needed.
2Manufacturing precision
If the contour shape of the cutting edge is complicated, then the shape accuracy is maintained, but the manufacturing cost increases
Solution Approach 1:
The complicated contour is divided into multiple simpler tooth-shaped segments, each with standardized geometry that is easier and less costly to manufacture through grinding or other processes.
Solution Approach 2:
Multiple cutting teeth are provided, where some teeth (roughing teeth) perform excessive material removal that is subsequently refined by other teeth (finishing teeth). This partial action approach reduces the complexity requirements for each individual tooth while maintaining overall accuracy.
3Manufacturing precision
If the cutting edge length is long, then the shape accuracy is maintained, but the grinding process becomes time-consuming
Solution Approach 1:
The long cutting edge is divided into multiple discrete tooth-shaped cutting edges, allowing the grinding process to work on smaller, simpler geometries in parallel rather than one long complex contour, thereby improving productivity.
Solution Approach 2:
Multiple tooth-shaped cutting edges are combined to collectively perform the function of a long cutting edge. The combined action of these teeth achieves the necessary material removal and shaping while each individual tooth maintains simple geometry for efficient grinding.
Data Source
AI summary
A threading cutting insert achieves high shape accuracy of a screw to be processed, and saves on manufacturing cost. Therefore in the threading cutting insert, a plurality of tooth-shaped cutting edges are formed in a cross ridge line portion between a rake face and flanks formed in a cutting side face, wherein the plurality of mountain-shaped cutting edges provides at least one finishing cutting edge for transferring a shape of a screw, and at least one roughing cutting edge formed in a tooth shape smaller than that of the finishing cutting edge. A flank of the finishing cutting edge includes a first flank, and a second flank having a clearance angle larger than that of the first flank, wherein the finishing cutting edge, the first flank, and the second flank are sequentially provided in that order from the rake surface in a direction of a lower surface of the insert.