Worm-Shaped Cutting Tool Gear Machining Method
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Solution Overview
Problem
The existing methods for machining gears with worm-shaped cutting tools, particularly grinding worms, face inefficiencies when the number of teeth and threads form an integer quotient, leading to systematic tool failures and increased tool changes, resulting in higher costs and reduced profitability due to the need for multiple tools and frequent setup changes.
Innovation Solution
A method involving a worm-shaped cutting tool that alternates meshing with different gaps on the workpiece, allowing for efficient machining with minimal tool changes by ensuring that at least 75% of material is removed in the first pass and maintaining consistent radial infeed, thereby avoiding systematic tool defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of teeth and threads form an integer quotient to simplify tool design, then tool design becomes simpler, but systematic tool failures occur and multiple tools are required
Solution Approach 1:
The patent introduces dynamic variability into the machining process by randomly selecting different starting gaps for each workpiece while maintaining the integer quotient relationship. This dynamic approach prevents systematic failures by ensuring that the same tool defect does not repeatedly affect the same tooth gap, thus resolving the contradiction between simple tool design and machining reliability
Solution Approach 2:
The patent changes the operational parameter of starting gap position while keeping the tool geometry fixed with integer quotient. By varying the starting gap position randomly within the range of 1 to the number of tool threads, the system maintains simple tool design while preventing systematic failures through parameter variation
2Reliability
If multiple tools are used to avoid systematic failures, then machining reliability improves, but tool storage requirements and setup changes increase
Solution Approach 1:
The patent makes a single tool perform multiple functions by enabling it to machine any tooth gap through random starting gap selection. Instead of requiring multiple specialized tools for different gap positions, one universal tool with variable starting positions can handle all gaps, thus improving reliability while reducing tool management complexity
Solution Approach 2:
The system dynamically selects starting gap positions during operation rather than requiring static assignment of specific tools to specific gaps. This dynamic flexibility allows a single tool to adaptively service multiple gaps, eliminating the need for multiple dedicated tools and reducing tool storage and setup requirements
3Reliability
If multiple tools are used to avoid systematic failures, then machining reliability improves, but setup time and costs increase
Solution Approach 1:
The system performs preliminary random selection of starting gap positions before the actual machining of each workpiece. This preliminary action ensures that each workpiece is machined with an optimized starting position that avoids known defects, maintaining high reliability without requiring time-consuming tool changes or setup adjustments during production
Solution Approach 2:
The patent changes the starting gap position parameter randomly for each workpiece rather than requiring fixed tool assignments. This parameter variation eliminates the need for frequent tool changes and setup adjustments, thereby maintaining machining reliability while significantly reducing setup time and associated costs
Data Source
AI summary
The invention relates to a method for machining a workpiece, preferably of a gear, with a multiple thread worm-shaped cutting tool with several parallel running helical and ridge-shaped cutting edges. To obtain a higher quality of the machining operation the invention proposes the following steps for the method: a) Bringing the cutting tool with the workpiece into mesh by inserting of a first helical cutting edge of the cutting tool in a first gap of the workpiece which has to be machined or has to be produced and machining of the workpiece with the cutting tool in this contact situation; b) Bringing the cutting tool and the workpiece out of mesh; c) Bringing the cutting tool with the workpiece again into mesh by inserting of the first helical cutting edge of the cutting tool in a second gap of the workpiece which is different from the first gap and machining of the workpiece with the cutting tool.