Skiving Tool Hyperboloid Layout for Collision-Free Hob Peeling
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Solution Overview
Problem
Conventional skiving processes face challenges in machining workpieces with limited overflow, requiring high cutting speeds and precise tool geometry, which can lead to collisions and inefficiencies, especially when producing internal gears or components with adjacent interference contours.
Innovation Solution
A modified skiving method involving a skiving tool with a tapered collision contour and a negative inclination angle, allowing for continuous rolling gear cutting with a relative movement akin to a helical gear, avoiding collisions and enabling the production of rotationally symmetrical periodic structures with constructive clearance angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional skiving processes are used with standard tool geometry, then machining of workpieces with limited overflow becomes difficult, but collisions between tool and workpiece occur
Solution Approach 1:
The patent applies inversion by tilting the skiving tool in the opposite direction from conventional practice. Instead of tilting the tool away from the workpiece to avoid collisions, the tool is tilted toward the workpiece with a negative inclination angle, which unexpectedly prevents collisions while enabling machining of workpieces with limited overflow
Solution Approach 2:
The patent changes the inclination angle parameter from positive (conventional) to negative (innovative), and modifies the tool collision contour from standard geometry to a specifically designed tapered contour. These parameter changes enable the tool to navigate workpieces with limited overflow without collisions
2Productivity
If high cutting speeds are used to improve productivity, then machining efficiency increases, but tool geometry precision requirements become more stringent
Solution Approach 1:
The patent implements preliminary action by pre-configuring the tool with a specifically designed negative inclination angle and tapered collision contour before machining begins. This preliminary setup allows the tool to maintain effectiveness throughout high-speed machining operations without requiring continuous geometric adjustments
Solution Approach 2:
The patent applies dynamics by designing the tool with a tapered collision contour that adapts to the machining conditions. The tapered geometry allows the tool to dynamically interact with the workpiece during high-speed machining, maintaining optimal contact while preventing collisions
3Device complexity
If standard skiving tools are used for internal gears, then tool simplicity is maintained, but collisions with adjacent interference contours occur
Solution Approach 1:
The patent applies local quality by modifying only the collision contour region of the tool while maintaining the overall simplicity of the tool design. The tapered collision contour is specifically designed for the local area where contact with the workpiece occurs, preventing collisions without complicating the entire tool structure
Data Source
Figure 1
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Figure 4A~4B
AI summary
The tool (100) has a base body (110) comprising accommodating openings uniformly arranged around a central rotational axis (R1), where each of the openings has an elongate shape with a longitudinal axis. The longitudinal axes of the openings form a rotational hyperboloid that is rotationally symmetric to the rotational axis. The openings open into a conical surface of a truncated cone-shaped region of the base part. The directly adjacent openings have minimum distance in a region of work piece-side front side of the base body.