Cutting Tool Insert Pocket Curved Restraining Surface
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Solution Overview
Problem
Existing cutting tools face instability in positioning cutting inserts due to manufacturing inaccuracies, leading to unstable fixation and potential shifting during high-speed machining, especially when wave-type contact surfaces do not mate correctly.
Innovation Solution
The cutting tool design incorporates a holder with an insert pocket featuring a projecting portion with a curved line shape and a recessed portion, allowing for stable fixation by maintaining contact at three points, including two points between the rear side surface and the second restraining surface, and one point between the inner side surface and the third restraining surface, enhancing durability against centrifugal forces and machining loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wave-type contact surface is provided to increase positioning accuracy, then positioning accuracy is improved, but manufacturing accuracy becomes difficult to control and stable fixation cannot be ensured
Solution Approach 1:
The invention applies curvature to the contact surfaces by providing an arc-shaped contact surface on the holder and a corresponding arc-shaped contact surface on the cutting insert. These curved surfaces mate with each other, allowing for stable positioning that is not dependent on high manufacturing accuracy. The curved geometry naturally guides the insert into the correct position while accommodating normal manufacturing tolerances.
Solution Approach 2:
The invention changes the geometric parameters of the contact surfaces from wave-type patterns to simple arc shapes. This parameter change simplifies the manufacturing requirements while maintaining the positioning function. The arc-shaped surfaces with specific radii can be manufactured with standard tolerances yet still provide reliable positioning and stable fixation.
2Measurement precision
If wave-type contact surfaces are used to improve positioning, then positioning accuracy is improved, but the cutting insert may contact the holder at only two points making stable fixation difficult
Solution Approach 1:
The arc-shaped contact surfaces on both the holder and cutting insert create a curved mating interface that ensures continuous surface contact rather than discrete point contact. This curved geometry distributes the contact forces along the arc, providing stable fixation and preventing the insert from contacting at only two points, thereby enhancing reliability during high-speed machining.
3Reliability
If side surfaces are made to contact the holder for stable fixation, then fixation stability is improved, but the cutting insert may shift from the desired position
Solution Approach 1:
The invention uses arc-shaped contact surfaces that combine the benefits of both positioning and stable fixation. The curved geometry provides precise positioning through the arc's inherent geometric constraints while simultaneously ensuring stable fixation through continuous surface contact. This eliminates the need to rely on side surface contact that causes shifting, as the arc-shaped interface naturally prevents positional deviation.
Data Source
AI summary
A cutting tool of an aspect is provided with a holder and a cutting insert attached to an insert pocket of the holder. The cutting insert includes a front end surface, a rear end surface, a front side surface, a rear side surface, an outer side surface, and an inner side surface. The cutting edge is disposed along a ridge line at an intersection between the front side surface and the front end surface, and a ridge line at an intersection between the front side surface and the outer side surface. The insert pocket includes a restraining surface that is in contact with the rear side surface, in a front end view, the restraining surface includes a projecting portion having a curved line shape projecting toward the front in the rotational direction, and the rear side surface includes a recessed portion that is in contact with the projecting portion.