Rotational Symmetric Cutting Insert for Stable Mounting
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Solution Overview
Problem
Small-sized cutting inserts with multiple corner cutting edges are difficult to mount stably on small-diameter cutters due to limited clamping surface and corner wear issues, leading to premature replacement and economic inefficiency.
Innovation Solution
A cutting insert design with opposite upper and lower faces, longitudinal and transverse side faces, and through holes, featuring inclined chip discharge grooves and rotational symmetry to create multiple corner cutting edges and a sufficient mounting surface, allowing stable mounting and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multiple corner cutting edges are formed on a small-sized cutting insert, then the service life time is extended, but it becomes extremely difficult to form the cutting edges and provide sufficient mounting surface
Solution Approach 1:
The cutting insert is segmented into multiple corner portions (typically 4 corners) where each corner can serve as a cutting edge. This segmentation allows the insert to be used multiple times by rotating to different corners, extending service life without requiring a larger insert body that would be difficult to manufacture.
Solution Approach 2:
The invention utilizes the rotational dimension by forming corner cutting edges at diagonally opposite corners on both upper and lower faces. This allows the insert to be rotated 180 degrees and mounted again with fresh cutting edges, effectively doubling the usable life without increasing the insert's footprint or mounting surface requirements.
2Volume of moving object
If the cutting insert size is reduced for small-diameter cutters, then the cutter size is reduced, but the mounting surface becomes insufficient for stable mounting
Solution Approach 1:
The invention concentrates the mounting function on specific localized areas - the upper and lower faces of the insert are designed with sufficient flat mounting surfaces that, while small in absolute area, provide adequate contact with the cutter pocket. The corner geometry is optimized to provide both cutting functionality and stable mounting without requiring overall insert size increase.
3Manufacturing precision
If corner cutting edges are worn away, then cutting precision is lost, but replacing the cutting insert is economically unfavorable
Solution Approach 1:
Instead of discarding the entire insert when one corner wears out, the invention allows recovery and reuse of the insert by rotating it to expose fresh corner cutting edges. This recovers the value of the insert body and mounting structure, making only the corner cutting edges consumable while retaining the expensive insert housing for repeated use.
Data Source
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AI summary
The present invention relates to a milling cutter (200) comprising an insert pocket (201) and a cutting insert (100) mounted in the insert pocket (201) by means of a clamping screw (210); the cutting insert (100) having a shape having an upper face (150) and a lower face (160) being opposite to each other, two longitudinal side faces (110, 120), and two transversal side faces (130, 140) connecting the upper face (150) and the lower face (160), with a through hole (190) passing through each central part of the upper face (150) and the lower face (160), wherein the longitudinal side faces (110, 120) are opposite to each other, and normal to the upper face (150) and the lower face (160); the transversal side faces (130, 140) are opposite to each other, and normal to the upper face (150) and the lower face (160); each of the upper face (150) and the lower face (160) is provided with two chip discharge grooves (153, 154) extended along both transversal side faces (130, 140), the two chip discharge grooves (153, 154) are inclined oppositely in the transverse direction so that each of the upper face (150) and the lower face (160) is provided with two corner cutting edges (150-1, 150-2) at diagonally opposite corners, the longitudinal length of the cutting insert (100) is longer than the transversal length of the cutting insert (100); wherein the cutting insert (100) is mounted in the pocket (201) such that the two longitudinal side faces (110, 120) are disposed in the axial direction of the cutter (200) and the two transversal side faces (130, 140) are disposed in the radial direction of the cutter (200); and one longitudinal side face (120) and one transversal side face (130) acts as the corner cutting edge.