Coated Cutting Insert Positioning for Reaming Accuracy
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Solution Overview
Problem
Existing metal-cutting machine tools with coated cutting plates face precision issues due to manufacturing tolerances and coating thickness variations, leading to inaccuracies in radial position, which affect the diameter of holes and tool performance.
Innovation Solution
The introduction of a positioning surface on the plate seat and a reference surface on the cutting plate, both coated uniformly, allows for radial position compensation, ensuring the cutting edge's position is independent of coating thickness, thereby enhancing precision and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a coating is applied to the cutting plate to improve cutting performance and durability, then the tool life and cutting efficiency are improved, but the coating thickness variation causes radial position deviation of the cutting edge, deteriorating the manufacturing precision
Solution Approach 1:
A reference surface is introduced as an intermediary element between the cutting plate and the plate seat. This reference surface, coated uniformly like the cutting edge, serves as a mediator that absorbs the coating thickness variation. By measuring and compensating for the reference surface's coating thickness, the system can calculate and correct the actual radial position of the cutting edge, thereby maintaining manufacturing precision despite variations in coating thickness.
Solution Approach 2:
The invention changes the parameter measurement approach from directly measuring the cutting edge position to measuring the reference surface position and then calculating the cutting edge position through parameter transformation. By measuring the coating thickness at the reference surface (which has a known geometric relationship to the cutting edge), the system transforms an unmeasurable quantity (cutting edge position affected by coating) into a measurable quantity (reference surface position) and then derives the required parameter through calculation.
2Duration of action of stationary object
If the coating thickness is increased to improve tool durability and performance, then the tool life is extended, but the radial position accuracy deteriorates due to larger thickness variations
Solution Approach 1:
The reference surface acts as a mediator that enables indirect measurement of the cutting edge position. Instead of directly measuring the cutting edge (which is affected by coating thickness), the system measures the reference surface and uses the known geometric relationship to calculate the cutting edge position, thereby maintaining measurement precision regardless of coating thickness.
Solution Approach 2:
The invention replaces direct mechanical measurement of the cutting edge position with an indirect measurement system. By using a reference surface with a known geometric relationship to the cutting edge, the system substitutes direct cutting edge measurement with reference surface measurement and mathematical calculation, thereby achieving accurate position determination independent of coating thickness.
3Duration of action of stationary object
If multiple plate elements are positioned on the machine tool to distribute cutting load, then the tool durability is improved, but concentricity errors occur due to coating thickness fluctuations, deteriorating the cutting precision
Solution Approach 1:
The reference surface serves as a mediator for each plate element, enabling individual measurement and compensation of coating thickness variations. By measuring the reference surface of each plate element and calculating its specific radial position offset, the system can compensate for coating variations in each element, thereby maintaining concentricity when multiple plate elements are used together.
Solution Approach 2:
The invention enables parameter transformation for each plate element individually. By measuring the reference surface position and transforming it into cutting edge position through calculation, the system can determine and compensate for the specific radial position offset of each plate element, thereby maintaining concentricity across multiple elements despite coating thickness fluctuations.
Data Source
AI summary
This disclosure relates to a metal-cutting machine tool with a base body, which is rotatable about an axis of rotation relative to a workpiece to be machined, at least one plate seat disposed outside the axis of rotation on the base body and a cutting insert, which is inserted into the plate seat and held therein by at least one fastening means and which is provided with a coating, at least in the area of its cutting edge. In order to compensate for positional tolerances, according to this disclosure the plate seat comprises a positioning surface oriented toward the axis of rotation, and the cutting insert has a reference surface lying against the positioning surface and facing away from the axis of rotation, for radially determining the position of its cutting edge, wherein the coating is also applied to the reference surface.