Hollow Core Drilling With Suction to Prevent Exit Chipping
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Solution Overview
Problem
Existing drilling technologies in CNC machining centers often result in material breakage at the outlet zone when drilling through glass or stone materials, especially in horizontal machining centers, due to the thrust force of the drilling tool and lubricating/cooling liquid.
Innovation Solution
A drilling method that uses a hollow drilling tool with a circular cutting edge and a cavity that generates a depression on the workpiece surface inside the tool, opposing the thrust force and preventing material breakage at the outlet zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drilling tool with hollow core is used to drill through glass or stone materials, then the material can be drilled with cooling and lubrication, but the thrust force of the tool and lubricating/cooling liquid causes breakage in the outlet zone
Solution Approach 1:
The patent applies the counterweight principle by introducing a suction force that opposes the thrust force of the drilling tool. The suction system creates a negative pressure zone at the outlet zone that counteracts the forward thrust of the drill, preventing the material from breaking under the combined pressure of the tool thrust and lubricating liquid. This force balance allows the drill to complete the through-hole without causing exit breakage.
Solution Approach 2:
The patent uses suction as an intermediary mechanism between the drilling tool and the material outlet zone. The suction system acts as a mediator that modifies the force environment at the critical outlet zone, creating a controlled negative pressure field that prevents breakage while allowing the drilling process to proceed normally.
2Object-affected harmful factors
If two opposite drilling tools are used to drill from both sides of the workpiece, then material breakage in the outlet zone can be avoided, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the suction function from a separate opposing drilling system and integrates it into a single-drill configuration. Instead of requiring two drilling tools working from opposite sides, the invention takes out the force-balancing function and implements it through a suction system attached to the single drilling tool, thereby simplifying the overall device while achieving the same breakage-prevention effect.
Solution Approach 2:
The suction system serves multiple functions: it prevents material breakage at the outlet zone, facilitates chip evacuation from the hole, and maintains proper cooling and lubrication flow. This multi-functionality replaces the need for a second drilling tool, achieving breakage prevention without increasing device complexity.
3Ease of operation
If a horizontal machining centre is equipped with a transmission system to drill from below, then drilling can be performed, but the system requires a fourth controlled axis and special positioning, increasing complexity and reducing versatility
Solution Approach 1:
The patent extracts the drilling capability from a complex transmission system and implements it through a simpler configuration. Instead of using a fourth controlled axis and special transmission mechanisms to enable bottom drilling, the invention takes out the essential function (drilling from below) and achieves it through a standard drilling tool combined with a suction system that prevents outlet zone breakage, thereby eliminating the need for complex transmissions and special positioning systems.
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 method effectively prevents material breakage during drilling, allowing for accurate and complete through holes in glass or stone materials without the need for additional equipment or subsequent machining to correct chips or imperfections.
Implementation Method 1
pneumatic suction means for generating a depression inside a cavity (2) of the drilling tool (1) so that, during drilling, the depression is present and operating on a surface of the workpiece (P) inside the tool (1)
Data Source
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AI summary
Drilling apparatus and method for making a through hole through the thickness of a workpiece (P) by a circular cutting edge of an internally hollow tool (1) which performs a rotational motion around a tool axis and an advancement motion along said tool axis, in which a depression is generated in a cavity (2) inside said tool during drilling, a depression that exerts on the workpiece a force (F1) that opposes a thrust force (F2) of the tool, in order to avoid the material of the workpiece breaking in an outlet zone of the tool exiting the thickness of the workpiece.