Drilling Tool Web Design for Chip Evacuation
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Solution Overview
Problem
Conventional drilling tools for metallic materials face issues with chip removal during the drilling process, as chips are often pushed against the bore wall due to centrifugal force, leading to sticking in cavities and requiring manual removal, which is time-consuming.
Innovation Solution
The drilling tool features a side wall with a raised web that extends in the circumferential direction, creating a partially closed chip space, allowing chips to be discharged without contact with the bore wall, and utilizes a straight groove design and high-pressure coolant to facilitate efficient chip evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional open chip spaces are used, then chip removal is simple, but chips are pushed against the bore wall by centrifugal force and get stuck in cavities
Solution Approach 1:
The chip space is segmented into an inner region and an outer region by the raised web. The inner region receives chips from cutting, while the outer region serves as a discharge path. This segmentation prevents chips from contacting the bore wall while maintaining reliable chip removal through the divided functional zones.
2Productivity
If radial angle of side walls is increased to promote chip evacuation, then chip removal improves, but chips may still contact bore wall
Solution Approach 1:
The raised web acts as an intermediary structure between the chip-generating cutting zone and the bore wall. It provides a protected discharge path that allows chips to be evacuated radially outward without directly contacting the bore wall, thus eliminating the harmful effect while maintaining efficient evacuation.
3Productivity
If straight groove design is used, then chip transport is rapid, but chip space volume is reduced
Solution Approach 1:
The chip space utilizes the circumferential dimension by raising a web in the circumferential direction. This creates a three-dimensional chip evacuation path that maintains rapid straight-line transport while effectively using the available volume through vertical (radial) utilization rather than only horizontal expansion.
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 design ensures reliable and rapid chip removal without manual intervention, enhancing drilling efficiency and reducing post-processing time by preventing chips from sticking in cavities.
Implementation Method 1
Due to the centrifugal force, the chips transported through the chip space during the drilling process are therefore not pushed against the bore wall, but against the web
Implementation Method 2
The two coolant outlets can be positioned in relation to one another in such a way that the chips that are produced are bundled at a distance from the bore wall in the region of an apex between the chip space walls
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a drilling tool, particularly for metallic materials, with a clamping shaft (1) and an essentially cylindrical drill body (3), with at least one groove-shaped chip space (5), which extends between the front end (9) of the drill body and the clamping shaft (1) and which is delimited by side walls (11, 13), where one side wall (11, 13) supports a cutting element (15) at the front end (9) of the drill body. According to the invention, the side wall (13) supporting the cutting element (15) has a web (19), which extends circumferentially upwards from the side wall (13) in the longitudinal direction of the drill.