Rear-Screw Cutting Holder for Easy Insert Removal
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Solution Overview
Problem
In existing cutting tools, the screw threads on the front side are prone to chip welding, making it difficult to remove the throw-away tip, and the clamp for insert becomes large to accommodate the screw hole, potentially increasing the tool's size.
Innovation Solution
A cutting holder design where the clamp for insert is disposed on the cutting edge side and the screw is located on the opposite end side, allowing the screw to rotate and pull the clamp towards the other end side, facilitating easy removal of the cutting insert without the need for screw threads on the cutting edge side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screw is disposed on the cutting edge side, then the clamp for insert can be secured, but chips of the work material are welded to the screw threads, making it difficult to remove the cutting insert
Solution Approach 1:
The patent divides the clamping system into two separate components: the clamp for insert (disposed on the cutting edge side) and the screw (disposed on the other end side). This segmentation allows the clamp to perform its clamping function while the screw remains isolated from chip contact, enabling easy removal by simply unscreving the screw without chip interference.
Solution Approach 2:
The screw is extracted from the cutting edge side and relocated to the other end side of the holder main body. This extraction removes the screw from the harmful environment where chips could weld to its threads, while the clamp remains on the cutting edge side to maintain clamping reliability.
2Ease of manufacture
If the clamp for insert is made large to accommodate the screw hole, then the screw can pass through, but the front side of the cutting tool becomes large
Solution Approach 1:
The patent relocates the screw from the front side (cutting edge side) to the rear side (other end side) of the holder main body. This dimensional relocation allows the screw to pass through the holder main body without requiring additional space in the clamp for insert on the front side, thereby maintaining a compact tool size while ensuring screw passage capability.
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
This configuration allows for easy removal of the cutting insert after use, prevents chip welding on the screw threads, and enables downsizing of the cutting tool by eliminating the need for a large clamp for insert.
Implementation Method 1
the screw rotates, so that the clamp for insert moves along a rotation axis of the screw and the clamp for insert disposed on the cutting edge side is pulled by the screw disposed on the other end side
Data Source
AI summary
A cutting holder that includes: a columnar holder main body that has, at one end in a longitudinal-direction, an insert seating surface on which a cutting insert is capable of being mounted, and that is formed with a through-hole which is open, on one side, toward the insert seating surface and is open, on the other side, toward the other end; a clamp for insert having a clamping portion that presses the cutting insert against the insert seating surface, and a first engagement portion; and a screw having a second engagement portion that is engaged with the first engagement portion, in which the clamping portion of the clamp for insert is disposed on cutting edge side with respect to the screw disposed in the through-hole, the screw rotates, so that the clamp for insert moves along a rotation axis of the screw and the clamp for insert disposed on the cutting edge side is pulled by the screw disposed on the other end side, and the clamp for insert moves toward the other end side, so that the clamping portion presses the cutting insert against the insert seating surface.