Double-Sided Thread Milling Insert Layout for Accurate Repositioning
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Solution Overview
Problem
Conventional thread milling tools with double-sided inserts face challenges in maintaining accurate positioning and efficient repositioning of worn-out cutting edges, leading to potential incorrect mounting and increased tolerance issues due to the need for inverted working positions.
Innovation Solution
The design features a thread milling tool with angularly and axially offset insert seats and double-sided inserts having a single axial abutment surface for both working positions, ensuring correct mounting and grinding tolerances by using the same surface as an axial reference plane for both cutting edge groups, preventing incorrect positioning and allowing simultaneous grinding of both cutting edge sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If double-sided thread milling inserts are used with inverted working positions, then the useful life of the insert is extended, but the positioning accuracy and mounting correctness deteriorate due to the complexity of repositioning
Solution Approach 1:
The insert body is designed with asymmetric features including a single axial abutment surface located at one specific end, and asymmetric fastening means positioned at predetermined locations. This asymmetry ensures that the insert can only be mounted in one correct orientation in each insert seat, eliminating the risk of incorrect mounting while maintaining the ability to reuse the insert in different seats after wear.
2Productivity
If multiple insert seats are provided at different axial positions, then the distribution of inserts is improved and vibrations are reduced, but the complexity of maintaining consistent tolerances increases
Solution Approach 1:
The insert is designed with a universal axial abutment surface that serves as the reference for positioning in multiple different insert seats located at various axial positions along the tool body. This single abutment surface enables consistent axial positioning tolerance to be maintained across all insert seats, simplifying tolerance management while allowing the insert to function correctly in multiple locations.
3Manufacturing precision
If the same axial surface is used as reference for both cutting edge groups, then grinding tolerances are simplified and mounting correctness is ensured, but the insert design becomes more constrained
Solution Approach 1:
The axial abutment surface is pre-configured on the insert body at a predetermined location before the insert is mounted in any insert seat. This pre-established reference surface allows both cutting edge groups to be ground with consistent axial tolerances relative to the same reference, ensuring mounting correctness. The asymmetric positioning of this abutment surface and the fastening means subsequently constrains the insert to a single correct orientation during installation.
Data Source
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Figure 5
AI summary
A thread milling tool comprising a tool body (2) with at least one pair of insert seats consisting of a first insert seat (10) and a second insert seat (20), which are angularly and axially offset from each other, and several double-sided thread milling inserts (30). Each thread milling inserts is adapted to the first and second insert seats such that it is: - mountable in the first insert seat (10) in one single working position with a first group of cutting edges (40a) on a first side of the thread milling insert in an active cutting position, and - mountable in the second insert seat (20) in one single working position with a second group of cutting edges (40b) on an opposite second side of the thread milling insert in an active cutting position. The invention also relates to a thread milling insert suitable for use in such a thread milling tool.