Cutting Tool Positioning Pin for Accurate Tool Rest Alignment
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Solution Overview
Problem
Existing cutting tool installation methods in lathe tool rests suffer from poor positioning accuracy due to screw play and require tedious fine adjustments, making the process cumbersome and inaccurate.
Innovation Solution
A cutting tool design featuring a positioning pin with a cylindrical portion and a female screw hole having a tapered surface, allowing for precise alignment and secure engagement, ensuring high positioning accuracy and simplified operation by matching the center axes and providing a stable contact point for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate-shaped member is fixed to the main body by commonly used screws, then the cutting tool can be installed in the tool rest, but positioning accuracy deteriorates due to play generated when the screw is tightened
Solution Approach 1:
The invention extracts the positioning function from the screw connection system and implements it through a dedicated positioning pin with a cylindrical portion that abuts against the tool rest. This separate positioning element eliminates the play caused by screw tightening, as the positioning pin provides precise location independently of the fastening mechanism.
Solution Approach 2:
The positioning pin acts as an intermediary element between the main body and the tool rest, providing a dedicated positioning interface. The cylindrical portion of the positioning pin abuts against the tool rest to establish precise position, while the male screw portion separately handles the fastening function through engagement with the female screw hole.
2Reliability
If the plate-shaped member is fixed by passing through a plurality of screws while checking orientation, then the connection is secure, but the operation becomes tedious requiring fine adjustment each time
Solution Approach 1:
The positioning pin is pre-installed on the main body before mounting to the tool rest. The cylindrical portion is positioned to protrude from the main body at the correct orientation, establishing the positioning geometry in advance. This preliminary positioning eliminates the need for orientation checking and fine adjustment during the actual installation process.
Solution Approach 2:
The positioning pin's cylindrical portion automatically aligns with the tool rest's abutting surface through its predetermined geometry. The self-aligning feature allows the cutting tool to be installed simply by placing it on the tool rest, with the positioning pin automatically establishing the correct position without requiring operator intervention for orientation adjustment.
3Manufacturing precision
If a positioning pin with cylindrical portion and tapered surface engagement is used, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The positioning pin integrates multiple functions into a single component: the cylindrical portion provides positioning by abutting against the tool rest, the male screw portion provides fastening through engagement with the female screw hole, and the tapered surface provides alignment and secure engagement. This multi-functional design achieves high positioning accuracy without requiring multiple separate components.
Data Source
AI summary
Provided is a cutting tool that implements both high positioning accuracy and simple operation when the cutting tool is installed in a tool rest. The cutting has: a tool a main body which includes a fixing seat fixing a cutting insert or a cutting edge; and a position pin, which includes a cylindrical portion that is used for positioning the main body by being abutted to an abutting surface of a tool rest in a case of installing the main body in the tool rest, and which is detachable from the main body. The main body includes a female screw hole that is provided with a female screw portion and a tapered surface that is symmetric with respect to a center axis of the female screw portion and that widens toward an opening thereof. The positioning pin includes a male screw portion that engages with the female screw portion, and a contact portion located at a connecting portion that connects an end of the cylindrical portion and an end of the male screw portion. In a case where the male screw portion is engaged with the female screw portion and the positioning pin is installed in the main body, the contact portion contacts the tapered surface, and a center axis of the cylindrical portion and a center axis of the tapered portion match with each other.