Lathe Turning Insert Mounting Structure for Stable Clamping
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Solution Overview
Problem
Existing lathe turning tools face issues with insufficient clamping force leading to insert damage, increased component count and cost, and excessive force on the tool holder due to press-fitting, which can result in deformation and screw damage.
Innovation Solution
A lathe turning tool design that stabilizes the cutting insert using a non-circular concave portion and a second portion with a parallel side surface, eliminating the need for a collet and reducing radial force on the tool holder, while a cutting insert with a polygonal or rounded cutting edge and grooves for coolant flow enhances clamping and reduces wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collet is used to fix the cutting insert, then the insert can be held in position, but the clamping force is insufficient leading to insert damage and the number of components increases
Solution Approach 1:
The invention extracts and eliminates the collet component from the tool assembly. Instead of using a separate collet to hold the cutting insert, the insert is directly mounted in a recess of the tool holder with its side surface abutting the holder's side surface, thereby reducing component count while maintaining secure positioning.
Solution Approach 2:
The invention merges the functions of the collet and tool holder into a single integrated structure. The tool holder directly provides both the recess for the insert and the side surface for abutting, combining what were previously separate components into one unified element.
2Reliability
If press-fitting is used to attach the cutting insert, then the insert can be fixed, but excessive force is exerted on the tool holder causing deformation and screw damage
Solution Approach 1:
The invention employs asymmetric force distribution in the insert attachment structure. The insert is positioned such that cutting forces are distributed between the recess walls and the abutting side surface, creating an asymmetric load path that prevents excessive concentrated force on any single point of the tool holder.
Solution Approach 2:
The invention segments the force transmission path into multiple independent contact points: the recess walls provide radial support while the abutting side surface provides axial support. This segmentation distributes the cutting forces across multiple locations, preventing excessive force concentration that would cause holder deformation.
3Device complexity
If the cutting insert is allowed to rotate freely, then the tool structure is simpler, but the insert position becomes unstable during processing
Solution Approach 1:
The invention uses asymmetric geometric constraints to prevent insert rotation. The non-circular recess and the abutting side surface create an asymmetric fit that inherently prevents rotational movement of the insert, eliminating the need for additional anti-rotation mechanisms while maintaining positional stability.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A cutting insert (10) is configured to include: a first portion (11) having a rake face (14), a flank face (15), a cutting edge (16), and a face (17) facing an insert attachment portion (3) at an end of a tool main body (1); and a second portion (12) having a side surface (12a) including at least one flat plane that is parallel to a center line (C) of a tool or inclined at a prescribed angle to the center line (C). The second portion (12) extends continuously to a region surrounded by the face (17) of the first portion. The second portion (12) is fitted into the tool main body (1) to position the cutting insert (10) and to prevent the cutting insert (10) from rotating.