Modular Rotary Cutting Tool Coupling Pin for Side-Load Stability
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Solution Overview
Problem
Modular rotary cutting tools experience excessive elastic or plastic deformation and peak loads during drilling on uneven or inclined surfaces due to radial and axial forces, leading to potential breakages.
Innovation Solution
The design incorporates clamping surfaces inclined with respect to the central longitudinal axis of the rotary cutting tool, featuring a support with a coupling pin receptacle divided into front and rear receiving parts, and a cutting head with a coupling pin also divided into front and rear parts, including torque and clamping surfaces that taper radially inward to prevent unwanted movement and reduce stresses on critical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cutting head is interchangeably mounted in the pocket structure of the support, then the modular rotary tool allows for easy replacement of cutting heads, but radial and axial forces during drilling on uneven or inclined surfaces cause excessive elastic or plastic deformation of the pocket structure, leading to peak loads and breakages
Solution Approach 1:
The coupling pin is divided into a front pin part and a rear pin part by a circumferential groove. The front pin part includes a clamping surface that engages with a corresponding clamping surface in the support, while the rear pin part includes a torque surface. This segmentation allows the clamping surface to bear the radial and axial forces separately from the torque transmission, preventing excessive deformation of the pocket structure while maintaining interchangeable mounting capability.
Solution Approach 2:
Different regions of the coupling pin are given different functional properties: the front pin part has a clamping surface with specific inclination angle (5-15 degrees) optimized for bearing radial and axial forces, while the rear pin part has a torque surface optimized for torque transmission. This local differentiation of functional properties allows each region to handle specific forces appropriately, preventing overall structural failure.
2Strength
If the clamping surfaces are arranged in different pin parts from the torque surfaces, then the forces are distributed more effectively, but the structural complexity of the coupling pin increases
Solution Approach 1:
The coupling pin is segmented into front and rear parts by a circumferential groove, with the clamping surface located on the front pin part and the torque surface on the rear pin part. This segmentation achieves effective force distribution while keeping the overall structure relatively simple through the use of a single groove feature that naturally divides the pin into functional zones.
Solution Approach 2:
The coupling pin serves multiple functions through its different parts: the front pin part with clamping surface handles radial and axial forces, while the rear pin part with torque surface handles torque transmission. This multi-functionality is achieved within a single integrated component rather than requiring separate elements, thus managing complexity while achieving effective force distribution.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A modular rotary cutting tool includes a cutting head for insertion into a support. The cutting head has a coupling pin having torque surfaces and clamping surfaces formed on its outer peripheral surface. The coupling pin is divided into a front pin part and a rear pin part. The front pin part is defined by a circumferential groove. Stop surfaces for an axial pullout prevention are formed between the front pin part and the rear pin part. The torque surfaces and the clamping surfaces are arranged in different pin parts. For example, the clamping surfaces are preferably formed on the front pin part and the torque surfaces are preferably formed on the rear pin part. The clamping surfaces taper radially inward in a direction of the front cutting part at an angle of inclination, α2, with respect to the axis of rotation. Other variants and embodiments are broadly contemplated herein.