Rotary Tool Cutting Head Fixation via Radial Pin
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Solution Overview
Problem
Existing turning tools experience high stress and wear on the cutting head and fastening screw during rotation, leading to reduced service life and increased material consumption, especially when machining aluminum and soft metal materials with high silicon content.
Innovation Solution
A turning tool design featuring a radially aligned pin and detachable fastening means with curved, angled, or shape-complementary contact surfaces that center and secure the cutting head on the tool shank, distributing torque forces effectively and minimizing mechanical loads on the fastening connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fastening screw is used to secure the cutting head to the tool shank, then the cutting head is fixed in position, but the screw experiences high stress and wear during rotation
Solution Approach 1:
The patent extracts the torque transmission function from the fastening screw by introducing a separate key element. The key takes over the anti-twist function while the screw is relieved of high rotational stresses, allowing it to focus only on axial clamping. This separation of functions extends the service life of the fastening screw.
Solution Approach 2:
The patent segments the fastening system into distinct functional elements: the screw provides axial clamping force while the key provides torque transmission and anti-twist protection. This segmentation allows each component to be optimized for its specific function, reducing overall stress on the screw and extending its durability.
2Stability of the object's composition
If grooves are used to prevent twisting of the cutting head, then rotational stability is improved, but high notch effect and rotational force concentrate on the groove surfaces
Solution Approach 1:
The patent extracts the anti-twist function from the groove surfaces by introducing a dedicated key element. The key assumes the role of preventing rotation and absorbing shear forces, while the grooves are relieved of high stress concentrations. This reduces wear and damage risk on the groove surfaces.
Solution Approach 2:
The key acts as an intermediary element between the cutting head and tool shank specifically for torque transmission. It mediates the anti-twist requirement by providing a positive mechanical engagement that prevents rotation without concentrating stress on the groove surfaces.
3Manufacturing precision
If contact surfaces are used for alignment, then positioning accuracy is improved, but the cutting head experiences high moment load over its entire length
Solution Approach 1:
The patent applies preliminary action by using the key to establish precise angular positioning and torque transmission before the cutting operation begins. The key ensures proper alignment and prevents twisting during machining, thereby reducing moment loads on the cutting head during operation.
Solution Approach 2:
The key serves as a mediator that provides positive mechanical engagement for torque transmission and anti-twist protection. It enables the cutting head to maintain precise alignment without experiencing excessive moment loads, as the key absorbs rotational stresses.
4Manufacturing precision
If the cutting head is securely fastened to prevent rotation, then machining precision is improved, but material consumption increases due to wear
Solution Approach 1:
The patent segments the fastening system into specialized components: the screw for axial clamping and the key for torque transmission. This segmentation reduces wear on individual components by assigning specific functions, thereby reducing material consumption through extended component life and fewer replacements.
Solution Approach 2:
The patent extracts the torque transmission and anti-twist functions from the screw and clamping mechanism by introducing a dedicated key element. This prevents excessive wear on the cutting head and fastening components caused by rotational stresses, reducing material consumption and extending tool life.
Data Source
Figure 1~2
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Figure 5(a)~8
AI summary
The invention relates to a turning tool (10) for machining workpieces, in particular a boring or grooving tool for machining bores with a diameter d ≤ 15 mm, comprising a clamping section (14) and a tool head (16) which has a tool shank (18) and a detachable cutting head (20) with at least one chip edge (38).It is proposed that the cutting head (20) can be attached, preferably by insertion, to a pin (62) integrally formed with the tool shank (18) and radially aligned, and/or to the tool shank (18) by means of a radially aligned, detachable fastening element (24), and that the cutting head (20) can be fixed in a longitudinal and transverse direction to the axis of rotation (22) via form-complementary contact surfaces (32a, 32b) of the tool shank (18) and the cutting head (20) in the form of alignment surfaces (30) between the cutting head (20) and the tool shank (18) that are substantially transverse to the axis of rotation (22) of the tool (10). The contact surface (32a) is defined at the axial end (45) of the tool shank (18), and the pin (62) and/or the fastening element (24) is offset back towards the clamping section (14). Attaching the cutting head (20) to the pin (62) and/or by the fastening means (24) thus causes axial compression of the contact surfaces (32a, 32b).