Cutting Insert Holder Clamping for Rigid Quick Replacement
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Solution Overview
Problem
Existing cutting tools for Swiss-type lathe machines lack sufficient rigidity and efficiency in replacing cutting inserts, leading to suboptimal accuracy and prolonged cycle times during grooving and turning processes.
Innovation Solution
A cutting tool design featuring a holder with a seat having a base, first side wall, and second side wall with acute angles, along with a screw and cut-out for the insert, where the screw and cut-out have complementary conical surfaces, allowing for increased stability and quick replacement of the cutting insert without full unscrewing, and reducing the number of cutting teeth for enhanced rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional cutting insert holder design is used, then the structure is simple, but the rigidity is insufficient and replacement cycle time is prolonged
Solution Approach 1:
The holder is segmented into functional zones: a clamping zone with the screw and conical surfaces for secure attachment, and a positioning zone with offset side walls for precision alignment. This segmentation allows each zone to perform its specific function optimally, enabling quick replacement while maintaining structural simplicity.
Solution Approach 2:
The cutting insert is pre-positioned against the offset second side wall and second positioning surface before clamping. This preliminary positioning ensures that when the screw is tightened, the insert is already aligned correctly, eliminating the need for complex adjustment mechanisms and reducing replacement time.
2Manufacturing precision
If the second side wall is positioned closer to the cutting edge, then rigidity and positioning accuracy improve, but the screw thread may become overloaded
Solution Approach 1:
The solution transitions from a single-dimension clamping approach to a two-dimensional force distribution system. The offset second side wall provides lateral support in one dimension, while the conical surfaces distribute clamping forces in another dimension, preventing thread overload while achieving high positioning accuracy.
Solution Approach 2:
The invention merges the positioning function and clamping function into a unified system. The offset second side wall simultaneously provides positioning support and force distribution, while the conical surfaces integrate clamping and alignment functions, allowing the screw to operate within safe load limits while achieving precise positioning.
3Adaptability or versatility
If multiple cutting teeth are provided on the insert, then versatility is improved, but the holder rigidity decreases
Solution Approach 1:
The holder design implements local quality by providing enhanced support specifically at the cutting edge region through the offset second side wall. This localized reinforcement maintains holder rigidity where it is most needed during cutting operations, while allowing the insert design flexibility for various cutting tooth configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a highly rigid and efficient system for replacing cutting inserts, enhancing stability and reducing cycle times by offsetting the second side wall and positioning surfaces closer to the cutting edge, allowing for precise clamping without overloading the screw thread, thus improving the accuracy and speed of cutting operations.
Implementation Method 1
the screw head of the screw and the cut-out of the cutting insert are provided with complementary conical surfaces, such that when tightening the screw the cutting insert is forced with the first positioning surface and the second positioning surface against the first side wall and the second side wall, respectively
Data Source
AI summary
The invention relates to a cutting tool with a holder, a cutting insert and a screw, wherein the holder has at least one seat with a base, a first side wall and a second side wall, wherein in a plane parallel to the base the first side wall extends in a first direction and the second side wall includes an acute angle (C) with the first side wall, wherein the base has a threaded hole for receiving the screw, wherein the cutting insert has a cut-out for the screw, wherein the cutting insert has a base contact surface, a first positioning surface and a second positioning surface, and wherein in a locked position the base contact surface, the first positioning surface and the second positioning surface of the cutting insert contact the base, the first side wall and the second side wall of the at least one seat, respectively, wherein the second side wall is offset from the threaded hole in the first direction towards a front end of the seat, and in that a screw head of the screw and the cut-out of the cutting insert are provided with complementary conical surfaces, such that when tightening the screw the cutting insert is forced with the first positioning surface and the second positioning surface against the first side wall and the second side wall, respectively.