Tool Holder Rotation Locking Flange Design
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Solution Overview
Problem
Existing machine tools face challenges in reliably locking the rotation of turning tools during processing, leading to insufficient rotation locking, interference with tool exchange, and reduced process precision due to complex configurations and inadequate radial force resistance.
Innovation Solution
A machine tool design featuring a rotation locking flange on the tool holder with two engaging holes positioned at an angle of 85 to 100 degrees, paired with engaging projections from the main-shaft head, which engage with the holes to prevent rotation and movement, and a biasing mechanism to ensure secure engagement without gaps, allowing for high precision turning processes without obstructing tool exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disc-shaped flange with key grooves is provided around the tool holder to lock rotation, then the rotation locking effect is improved, but the flange interferes with the grip for gripping the tool holder during tool exchange
Solution Approach 1:
The invention extracts the rotation locking function from a circumferential flange structure and relocates it to the end surface of the tool holder. By providing engaging holes and engaging projections at the end surface rather than around the circumference, the locking function is separated from the grip area, eliminating interference with tool exchange while maintaining rotation locking reliability
Solution Approach 2:
The invention transitions the locking mechanism from a two-dimensional circumferential arrangement (key grooves around the flange) to a three-dimensional configuration where engaging holes are positioned at the end surface in specific angular relationships. This dimensional change allows the locking function to coexist with the grip function without spatial interference
2Device complexity
If the pin and positioning block engage at only one position in circumferential direction to simplify configuration, then the device complexity is reduced, but the rotation locking effect and radial force resistance are insufficient
Solution Approach 1:
The invention employs asymmetric positioning of the two engaging holes on the end surface of the tool holder. The holes are positioned such that their center lines form angles of 85-100 degrees with the central axis, creating an asymmetric arrangement that provides both rotation locking and radial force resistance without requiring a symmetric multi-position locking mechanism
Solution Approach 2:
The invention merges multiple functions into the engaging holes and projections: rotation locking, radial force resistance, and positioning. By strategically positioning two engaging holes at specific angles rather than using multiple separate locking elements at different positions, the mechanism achieves multiple functions with a unified simple structure
3Manufacturing precision
If engaging holes and projections are positioned to prevent rotation and radial movement, then the manufacturing precision is improved, but the configuration becomes more complex
Solution Approach 1:
The invention optimizes the angular parameters of the engaging holes to achieve the desired precision. By setting the angles between the center lines of the engaging holes and the central axis within the range of 85-100 degrees, the mechanism achieves optimal balance between rotation locking, radial force resistance, and structural simplicity, thereby ensuring high manufacturing precision without excessive complexity
Data Source
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AI summary
The present invention provides a machine tool which reliably prevents the rotation and the movement of a turning tool to be attached to a rotatable main shaft via a tool holder with a simple configuration, and which permits a turning process with high process precision, and provides such a tool holder. In a machine tool (1) that attaches tools (3) for rotation process and turning process via a tool holder (30) to an end part of a main shaft (20) which is supported by a main-shaft head (2) and rotates about its central axis, a rotation locking flange (31) is provided on an outer circumference of the tool holder (30) holding the tool (3) to widen outward in a radial direction. Two engaging holes aligned on a circumference of a circle coaxial with the tool holder (30) are formed in the rotation locking flange (31), and the engaging holes are engaged with two engaging projections (23) projecting from a lower face of the main-shaft head (2), and thereby the rotation and the movement in a radial direction of the tool holder (30) are prevented.