Chamfering Cutter Insert Positioning via Segmented Restraint Walls
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Solution Overview
Problem
In chamfering cutters, the cutting insert is subjected to rotational moments during screwing, leading to incorrect positioning and reduced precision, potentially causing looseness and breakage due to the deviation of the fastening screw from the center of the attachment hole, resulting in compromised configuration precision.
Innovation Solution
The cutting insert is designed to make line contact with one peripheral face parallel to the first restraint wall and point or line contact with the second restraint wall, enhancing attachment precision and stability by aligning the cutting edge with the tool body, thereby improving the positioning and processing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fastening screw is deviated from the center of the attachment hole to contact the inner peripheral face, then the cutting insert can be fixed to the tool body, but the cutting insert is subjected to rotational moments causing incorrect positioning and reduced precision
Solution Approach 1:
The constraint function is segmented between two distinct components: the first restraint wall face provides line contact for primary positioning, while the second restraint wall face provides point contact for secondary positioning. This segmentation allows each wall face to perform its specific constraint function without interfering with the other, eliminating the rotational moment problem.
Solution Approach 2:
The restraint wall faces act as intermediary elements between the cutting insert and the tool body. Instead of direct contact between the fastening screw and the cutting insert peripheral face (which causes rotation), the restraint wall faces mediate the constraint, providing stable positioning without generating harmful rotational moments.
2Ease of operation
If the cutting insert is forced to rotate during screwing, then the fastening screw can be installed, but the cutting edge cannot be correctly positioned to the cutting body
Solution Approach 1:
The restraint wall faces are pre-configured in the tool body to provide the correct positioning geometry before the fastening operation begins. The first restraint wall face is positioned to provide line contact, and the second restraint wall face is positioned to provide point contact, establishing the correct cutting edge position before the fastening screw is fully tightened.
3Reliability
If the cutting insert is subjected to rotational moments, then the fastening screw can engage the attachment hole, but looseness of the fastening screw is generated and breakage may occur
Solution Approach 1:
The design converts the potential harmful rotational moment into a beneficial constraint mechanism. By positioning the first restraint wall face to provide line contact and the second restraint wall face to provide point contact, the system uses the fastening screw's tightening force to press the cutting insert against the restraint wall faces in a controlled manner, preventing unwanted rotation while maintaining strong fastening.
Data Source
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AI summary
As viewed from a side opposing a bottom face (6) of an insert attachment seat, an angle (α) between first and second restraint wall faces (7a) and (7b) rising from the bottom face (6) is smaller than an angle (β) between two peripheral faces of a cutting insert contacting them respectively. One peripheral face out of the two peripheral faces of the cutting insert contacts the first restrain wall face (7a) in a substantially parallel posture with the extending direction of the first restraint wall face (7a), and the other peripheral face contacts the second restraint wall face (7b) in one end portion of the second restraint wall face (7b).