Weldon Tool Holder Contact Geometry to Prevent Tool Sticking
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Solution Overview
Problem
Under extreme working conditions, material accumulation occurs in the transition area of the planar investment surface to the cylindrical part of the tool, causing the tool to become stuck in the working spindle due to diameter enlargement.
Innovation Solution
The clamping surface of the clamping cheek is designed to only touch the tool shaft in specific areas, creating a recess that redirects material accumulation away from the transition area, allowing the tool to be removed without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping surface contacts the flat surface at the transition area, then the tool is securely locked in the work spindle, but material accumulation occurs causing the tool to become stuck
Solution Approach 1:
The invention extracts the harmful contact area by positioning the clamping surface to contact the flat surface at a location spaced from the transition area. This removes the source of material accumulation that causes tool sticking, while maintaining secure tool locking through proper contact zone selection.
Solution Approach 2:
The invention applies local quality by creating different functional zones on the flat surface: one area for secure clamping contact and another area (the transition area) free from clamping contact to prevent material accumulation. This spatial differentiation resolves the contradiction between secure locking and easy removal.
2Reliability
If material accumulation occurs in the transition area, then the tool shank diameter increases beyond the locating sleeve radius, but tool removal becomes difficult or impossible
Solution Approach 1:
The invention extracts the problem source by relocating the clamping contact away from the transition area, preventing material accumulation that would otherwise increase the tool shank diameter beyond the locating sleeve radius and complicate tool removal.
Solution Approach 2:
The invention applies preliminary anti-action by designing the clamping surface position in advance to prevent material accumulation in the first place, rather than dealing with removal difficulties after accumulation occurs. The contact zone is strategically positioned to avoid generating harmful material buildup.
3Power
If the clamping jaw is positioned to secure the tool, then torque is effectively transmitted, but material buildup occurs at the flat surface side
Solution Approach 1:
The invention applies local quality by creating distinct functional zones: the clamping contact area for effective torque transmission, and the transition area spaced from contact to prevent material accumulation. This spatial separation allows both power transmission and clean operation.
Solution Approach 2:
The invention extracts the harmful element by positioning the clamping surface to contact the flat surface away from the transition area, removing the source of material buildup while maintaining adequate contact area for effective torque transmission during operation.
Data Source
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AI summary
The invention relates to a tool holder for a tool rotatable about a rotational axis and having a flat surface, in particular a Weldon tool holder for a milling tool or a core drill, the clamping jaw of which has a contact surface that is spaced apart from the flat surface side of the flat surface and contacts the flat surface when the clamping jaw is pressed against the flat surface in a second arrangement of the clamping jaw or in the mounting position of the tool. The invention also relates to a stationary machine tool with this tool holder, a tool holding system with this tool holder and the tool, and a method for manufacturing it.