Deep Drilling Guide Pad With Segmented Wear Areas
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Solution Overview
Problem
Existing guide strips for deep drilling tools have short service lives due to high wear, leading to increased tool costs and downtime, as they need frequent replacement during long drilling processes.
Innovation Solution
The guide strips feature a longitudinally extending concave longitudinal groove, dividing the surface pressure over multiple wear areas, reducing specific wear and extending service life, with double radius geometry and chamfered surfaces for even pressure distribution and a quasi-floating mounting system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide strips have a continuous surface for supporting drill heads, then the guiding function and smoothing effect are improved, but the wear area is reduced and service life is shortened
Solution Approach 1:
The guide bar surface is segmented into multiple separate wear areas by longitudinal grooves, distributing the surface pressure across these distinct areas. This segmentation prevents any single area from experiencing excessive wear, thereby extending the overall service life while maintaining the guiding function.
Solution Approach 2:
Different regions of the guide bar surface are given different functions: the longitudinal grooves provide pressure distribution and wear resistance, while the wear areas provide guiding and smoothing functions. This local differentiation optimizes both service life and guiding performance.
2Ease of repair
If guide strips are made replaceable for easier maintenance, then ease of repair is improved, but device complexity increases due to additional mounting components
Solution Approach 1:
The guide bar is designed as a separate, replaceable component from the drill head, allowing the guide bar to be independently maintained. This segmentation enables easy replacement of worn guide bars without affecting the drill head assembly.
Solution Approach 2:
The guide bar is extracted as a separate functional element that can be removed and replaced independently. The longitudinal grooves are integrated into the guide bar itself, eliminating the need for separate mounting structures for these features.
3Productivity
If drilling depth is increased to improve productivity, then output is improved, but wear on guide strips increases and requires more frequent replacement
Solution Approach 1:
The surface pressure during deep drilling is segmented across multiple wear areas created by longitudinal grooves. This distribution prevents concentrated wear at any single location, enabling the guide bar to withstand extended drilling depths and longer operational periods between replacements.
Solution Approach 2:
The longitudinal grooves are pre-formed during manufacturing to create multiple wear areas in advance. This preliminary structuring ensures that wear is distributed from the beginning of operation, extending the guide bar's service life throughout the entire deep drilling process.
Data Source
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AI summary
The guide rail (14) has deep holes formed in work pieces by using a drilling head (10), where the drilling head is guided at a drilling rod and provided with a cutting tool (12). The drilling head is supported at a hole surface with a surface (21) that comprises wear areas (23). The wear areas receive the surface pressure, and are separated from each other. The surface is provided with a concave longitudinal groove (22) that extends in a longitudinal direction. The surface has double radius geometry (24) in a transverse direction on sides of the groove extending in the longitudinal direction. The guide rail is made of a ceramic material, hard metal, composite material and sintered metal.