Deburring Tool Cyclic Cam Geometry for Small Bore Edge Finishing
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Solution Overview
Problem
Existing deburring tools for orthogonal and inclined transverse bores with diameters less than 10 mm face challenges in cost-effective production, handling high-strength materials, and achieving consistent deburring quality due to complex designs and variable pressure angles, leading to unsatisfactory results and secondary burr formation.
Innovation Solution
A deburring tool with a modified cutting edge geometry featuring cyclic cam surfaces, such as logarithmic spirals, with zero clearance angle and angled shoulders, allowing for constant pressure angles and reduced manufacturing effort, enabling efficient deburring of abutting edges on orthogonal and inclined transverse bores without sudden load on the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional deburring tool design with connecting elements is used, then the tool can be assembled, but the manufacturing effort increases significantly
Solution Approach 1:
The support body is integrated directly into the tool shank as a fixed bearing, eliminating the need for separate connecting elements. This merging of components simplifies the tool structure and reduces manufacturing effort while maintaining the necessary functional relationships between the cutting elements and the tool body.
Solution Approach 2:
The tool shank is designed to directly accommodate cutting elements for multiple bore sizes through a universal interface. The support body serves multiple functions: it acts as a fixed bearing, provides structural support, and enables the tool to handle various bore diameters without requiring additional connecting components, thereby reducing overall device complexity.
2Ease of manufacture
If a cutting edge with laterally arranged shoulders is used, then the tool can be manufactured, but deburring of angled transverse bores with smaller diameters is hindered
Solution Approach 1:
The shoulder angle of the cutting edge is optimized to a range of 5 to 45 degrees. This parameter adjustment allows the cutting edge to effectively engage with and remove burrs from angled transverse bores with smaller diameters, significantly improving the tool's adaptability while maintaining manufacturability through standard machining processes.
3Device complexity
If variable pressure angles are used in the cutting edge geometry, then the tool can be designed, but inconsistent deburring quality and secondary burr formation occur
Solution Approach 1:
The cutting edge is designed with a constant pressure angle throughout its engagement with the workpiece. This creates an equipotential condition where the cutting forces remain uniform during the deburring process, eliminating variations that cause inconsistent quality and secondary burr formation. The cyclic cam surfaces maintain this constant angle through their geometric design, ensuring reliable deburring results.
4Productivity
If high cutting forces are applied to remove burrs on high-strength materials, then deburring effectiveness improves, but shock loading occurs on the cutting edge
Solution Approach 1:
The cyclic cam surfaces are designed to gradually build up cutting forces during the deburring stroke, cushioning the initial impact. This progressive force application prevents sudden shock loading on the cutting edge while maintaining sufficient cutting pressure to effectively remove burrs from high-strength materials, thereby improving both productivity and cutting edge reliability.
Data Source
Figure 1~4
AI summary
The invention relates to a deburring tool for deburring abutting edges at orthogonally and obliquelly extending transversal boreholes having a diameter of less than 10 mm in a component, such as an engine block, an injection system for combustion engines, a valve block and a camshaft or transmission shaft. The deburring tool is moved in a rotational and/or translatory manner and comprises a tool shaft (1), which is provided with a clamping end (2), and a tubular shaft part (5), characterized in that said tubular shaft part holds one or several cutting bodies (11) with a cutting blade (3), the cutting bodies being mounted in a movable manner in a passage (10), and in that a substance that is pressed under pressure into the through-bore (7) of the tool shaft (1) displaces the blade(s) to the exterior. The deburring tool is configured as a single piece and can be produced at low cost. Different blade geometries remove the burr by means of high speed deburring. The deburring tool can be introduced into the main borehole (HB) and the transversal borehole (QB). The technological requirements for the use of said deburring tool in intermittent assembly lines are therefore met.