Drill And Reamer Coupling With Wedge Locking For Accurate Centering
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Solution Overview
Problem
Conical coupling arrangements for drills and reamers face challenges in achieving accuracy and strength due to the need for expensive grinding of conical surfaces, difficulty in adjusting the angle for optimal performance, and a short coupling length that affects machining throw.
Innovation Solution
A coupling arrangement featuring tool and shank portions with axial stoppers, a cylindrical coupling end, and an elongated coupling member, where the tool coupling end abuts the shank axial stopper and the coupling member is wedged between the tool coupling end and a bore recess, allowing for a longer coupling length and adjustable abutment angles to enhance accuracy and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conical surfaces are used for coupling, then centering and torque transfer are achieved, but manufacturing cost increases due to expensive grinding
Solution Approach 1:
The coupling interface is segmented into a cylindrical portion and a conical portion. The cylindrical portion provides centering and location, while the conical portion provides torque transfer. This segmentation allows each portion to be optimized independently, with the cylindrical portion being easier and cheaper to manufacture.
Solution Approach 2:
The invention uses a cylindrical surface instead of a fully conical surface for the coupling interface. The cylindrical geometry is simpler to manufacture than conical surfaces requiring expensive grinding, while still achieving the necessary centering and location functions when combined with the conical torque transfer portion.
2Strength
If the conical angle is increased to strengthen the conical seat, then structural strength improves, but coupling accuracy decreases
Solution Approach 1:
The coupling interface is divided into functional segments: the cylindrical portion handles centering and location with high precision, while the conical portion handles torque transfer. This allows the conical angle to be optimized for strength without compromising the accuracy provided by the cylindrical portion.
Solution Approach 2:
Instead of relying entirely on the conical surface for both centering and torque transfer, the invention uses the cylindrical surface for centering and location, and only the conical surface for torque transfer. This partial action approach allows the conical portion to be designed for maximum strength.
3Manufacturing precision
If the coupling region length is increased to reduce throw, then machining accuracy improves, but the overall coupling design becomes more complex
Solution Approach 1:
The coupling interface is segmented into cylindrical and conical portions with distinct functions. The cylindrical portion provides precise centering over a sufficient length to control throw, while the conical portion provides torque transfer. This segmentation achieves the required precision without excessive overall complexity.
Solution Approach 2:
The cylindrical geometry of the coupling interface simplifies the overall design compared to a fully conical interface. The cylindrical portion provides the necessary length for controlling throw while maintaining geometric simplicity and ease of manufacture.
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 improves the accuracy and strength of the coupling, reduces machining throw, and allows for easier assembly and disassembly while maintaining axial alignment, enhancing the overall performance and reliability of the drill and reamer tools.
Implementation Method 1
The member coupling end is wedged between the tool coupling end and the bore recess
Implementation Method 2
the tool coupling end abuts the front and rear sub-portions, and the member coupling end is wedged between the tool coupling end and the bore recess
Implementation Method 3
the tool axial stopper abuts the shank axial stopper
Implementation Method 4
the member coupling end is wedged between the tool coupling end and the bore recess
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A tool coupling arrangement (12) for drills and reamers includes tool and shank portions (14,16) with respective tool and shank axial stoppers (46,48). An at least partially cylindrical tool coupling end (24) of the tool portion (14) is located within a longitudinal through forward bore portion (76) in the shank portion (16), and is coupled therein via an elongated coupling member (18), which is located further inwards in the shank portion (16) and comprises axially opposite member coupling and pulling ends (56,58). The forward bore portion (76) has front and rear sub-portions (76F,76R) and a bore recess (80) which is located therebetween and extends radially outwardly. In a locked position (figures 3 to 6), the tool axial stopper (46) abuts the shank axial stopper (48). The tool coupling end (24) abuts the front and rear sub-portions (76F,76R) and coupling end (56) of the coupling member (18) is wedged between the tool coupling end (24) and the bore recess (80).