Partial Grinding of Sintered Tool Bit Swarf Chamber
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Solution Overview
Problem
The production of sintered tool bits is costly due to shrinkage unpredictability during the sintering process, resulting in oversize blanks that require expensive grinding to achieve the correct size, and the hard sintered material is difficult to process.
Innovation Solution
The method involves producing a tool bit with only partial grinding of the swarf chamber, specifically in regions adjoining cutting edges, allowing the tool bit to be ready for use without compromising its performance, thereby reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blank is dimensioned to account for shrinkage during sintering, then the sintered tool bit achieves the correct size, but the blank becomes oversize and requires expensive grinding to reduce the dimension
Solution Approach 1:
The patent applies partial grinding instead of complete grinding of the sintered tool bit. Only specific regions that require precise dimensions are ground, while other regions are left unground. This partial action reduces the overall grinding cost and complexity while still achieving the necessary size accuracy for critical dimensions.
2Manufacturing precision
If the tool bit is fully ground to achieve precise dimensions, then the manufacturing precision is improved, but the production cost increases due to extensive processing of hard sintered material
Solution Approach 1:
The patent implements local quality by applying grinding only to specific regions of the tool bit where high dimensional accuracy is required, such as the cutting edges and critical surfaces. Other regions are left in their as-sintered state, avoiding unnecessary grinding operations and reducing overall production cost while maintaining sufficient precision for the application.
3Reliability
If the swarf chamber is completely ground, then the tool bit performance is optimized, but the production time and cost increase
Solution Approach 1:
The patent applies partial grinding to the swarf chamber rather than complete grinding. Only the portions of the swarf chamber that directly affect tool bit performance are ground, while other portions are left unground. This partial action maintains adequate performance while significantly reducing production time and cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces production costs by minimizing grinding requirements while maintaining the tool bit's functionality, as the tool bit is fully ready for machining without the need for extensive processing.
Implementation Method 1
The blank shrinks during the sintering process, the exact amount of shrinkage being difficult to predict.
Data Source
AI summary
A tool bit (1) ready for use consists of a sintered material. It has a longitudinal axis (3). At least one swarf chamber (4) spaced from the longitudinal axis (3) land extending along the longitudinal axis (3) is formed in the tool bit (1). The tool bit (1) has at least one cutting edge (8, 10), which is formed in the tool bit (1) by grinding the already sintered tool bit (1), adjoining the swarf chamber (4). According to the invention the swarf chamber (4) is ground only partly and is otherwise unground.