Three-Tooth Thread Turning Insert for Two-Pass Thread Cutting
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Solution Overview
Problem
Existing thread turning cutting tools face challenges in achieving improved tool life and require multiple passes to cut a thread, which can be inefficient and costly.
Innovation Solution
A thread turning cutting insert with three non-identical cutting teeth, each with distinct shapes and sizes, arranged sequentially for a two-pass cutting process, featuring a chip forming groove and planar land surfaces to enhance durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thread turning cutting tools with identical cutting teeth are used, then the cutting process requires multiple passes to complete thread cutting, but this increases production time and reduces productivity
Solution Approach 1:
The cutting insert is segmented into three distinct cutting teeth (roughing tooth, semi-finishing tooth, and finishing tooth), each with different geometries and functions. This segmentation allows the single insert to perform multiple cutting operations (roughing, semi-finishing, and finishing) in sequence during one pass, eliminating the need for multiple passes and indexed inserts, thereby improving productivity and reducing production time
Solution Approach 2:
The cutting insert is designed as a universal tool that integrates three different cutting functions into a single component. The roughing tooth, semi-finishing tooth, and finishing tooth all reside on one insert, enabling it to perform roughing, semi-finishing, and finishing operations sequentially. This multi-functionality eliminates the need for multiple specialized inserts and indexing operations, significantly improving生产效率 and reducing tool change time
2Duration of action of moving object
If conventional cutting inserts without optimized land surfaces are used, then the cutting process can be completed, but tool life is reduced due to increased wear and heat
Solution Approach 1:
The cutting insert features locally optimized land surfaces with specific geometries and orientations tailored to each cutting tooth's function. The roughing tooth land surface is designed to handle high material removal rates, while the finishing tooth land surface is optimized for surface quality and reduced heat generation. This local quality optimization at critical contact zones reduces wear and heat accumulation, extending tool life and improving cutting process stability
Solution Approach 2:
The land surfaces are pre-configured with optimal geometries and orientations before the cutting operation begins. The roughing tooth land surface is positioned and shaped to immediately handle the high-stress roughing operation, while the semi-finishing and finishing tooth land surfaces are pre-aligned to progressively reduce stress and heat. This preliminary configuration ensures that each tooth is ready to perform its function optimally from the start of cutting, reducing wear and extending tool life
Data Source
AI summary
A cutting tool for thread cutting has a thread turning cutting insert releasably retained in an insert pocket by a fastening member. The thread turning cutting insert has a thread cutting portion having three spaced apart cutting teeth. and a chip forming groove recessed in an insert upper surface. The chip forming groove includes a near-flank groove surface close to the cutting teeth and far-flank grove surface further away from the cutting teeth. The thread cutting portion includes three cutting edges formed at the intersection of the insert upper surface and an insert peripheral surface. Each cutting edge is located on a respective cutting tooth. The thread cutting portion includes three planar land surfaces located on the insert upper surface. Each land surface extends from an entire length of a respective cutting edge to the near-flank groove surface.