Cylindrical Drill Oil Flow for Guide Bush Precision
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Solution Overview
Problem
Conventional drilling methods using drills with back tapers suffer from reduced precision and accuracy due to increased gaps between the drill and guide bush, leading to degradation in drilling quality, especially when drilling complex materials like CFRP and titanium alloys.
Innovation Solution
A drill design without a back taper, featuring a body with internal cutting oil flow paths that branch into first and second flow paths, where the cutting oil is supplied through first supply ports to the workpiece and second supply ports to the clearance between the drill and guide bush, maintaining lubrication and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a drill with back taper is used, then the drill structure is conventional and simple to manufacture, but the gap between drill and guide bush increases leading to reduced drilling precision
Solution Approach 1:
The patent inverts the conventional drill design by eliminating the back taper, making the drill body cylindrical throughout. This reversal of the traditional tapered design allows the drill to maintain consistent contact with the guide bush, preventing gap formation and improving drilling precision while simplifying the overall structure.
Solution Approach 2:
The patent changes the geometric parameter of the drill body from tapered to cylindrical by removing the back taper. This parameter change ensures uniform diameter along the drill length, maintaining optimal fit with the guide bush and preventing the degradation of drilling precision that occurs with conventional tapered designs.
2Ease of operation
If cutting oil is supplied only to the workpiece, then the cutting process is lubricated, but the clearance between drill and guide bush lacks lubrication causing increased friction
Solution Approach 1:
The patent segments the cutting oil supply into two distinct flow paths: one supplying the workpiece cutting zone and another supplying the clearance between drill and guide bush. This segmentation ensures both areas receive adequate lubrication, reducing friction and improving operational smoothness without energy loss.
Solution Approach 2:
The patent introduces cutting oil as an intermediary substance in the clearance between drill and guide bush. This mediator reduces friction and wear in the guiding interface, enabling smoother drill movement through the guide bush while maintaining efficient cutting at the workpiece interface.
3Manufacturing precision
If the drill body is cylindrical without back taper, then the fit with guide bush is consistent improving precision, but the drill design departs from conventional structures
Solution Approach 1:
The patent inverts the conventional tapered drill design by using a cylindrical body without back taper. This inversion simplifies the manufacturing process by eliminating the complex tapering operation while simultaneously improving precision through consistent guide bush contact, achieving both goals through the same design reversal.
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 enhances drilling precision and quality by maintaining a consistent fit between the drill and guide bush, reducing friction, and effectively supplying cutting oil to both the workpiece and the interface between the drill and guide bush, thereby improving the accuracy and longevity of the drilling process.
Implementation Method 1
supplying cutting oil leads to improvement in drilling precision and a tool life
Implementation Method 2
maintaining lubrication and reducing friction
Data Source
AI summary
According to one implementation, a drill includes: a body without a back taper and a cutting edge part. The body has a flow path of a cutting oil. The flow path is branched to first and second flow paths inside the body. The cutting edge part has a first supply port that supplies the cutting oil toward a workpiece. The first supply port is an outlet of the first flow path. The body has a second supply port that supplies the cutting oil to a clearance between the body and a bush for positioning the body. The second supply port is an outlet of the second flow path. The second flow path has a pressure loss by which the cutting oil is not scattered from the second supply port in a radial direction of the body but exuded from the second supply port.