Internal Broaching Machine Tool Holder Anti-Slip Mechanism
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Solution Overview
Problem
Internal broaching machines face issues with the broaching tool slipping during machining, particularly with large workpieces or tools made of hard materials, which can lead to damage to the workpiece or tool.
Innovation Solution
The broaching tool is secured using a tool holder with a pressure sleeve and collets that form a conical inner contour, providing a positive and non-positive connection to prevent slipping, and a mechanical lock ensures constant frictional connection without external force, allowing for precise broaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the broaching tool is clamped using conventional tool holders, then the machining process can proceed, but the tool may slip through during machining of large workpieces or hard materials
Solution Approach 1:
The patent employs a conical inner contour in the collets that narrows in the direction of the broaching tool, creating a tapered gripping surface. This conical geometry provides a positive connection that prevents the tool from slipping through during machining operations, while the frictional contact area increases with the applied clamping force.
Solution Approach 2:
The patent introduces a pressure sleeve as an intermediary element that can be displaced axially within the housing to move the collets radially. This pressure sleeve transfers the clamping force uniformly to the collets, enabling even distribution of the gripping force on the broaching tool shank without requiring direct mechanical linkage between the actuating mechanism and the collets.
2Reliability
If high clamping forces are applied to prevent tool slipping, then tool holding reliability improves, but the risk of tool or workpiece damage increases
Solution Approach 1:
The patent applies different functional qualities to different parts of the clamping system. The collets have a conical inner contour that provides a positive mechanical connection preventing tool slip, while the pressure sleeve distributes the clamping force uniformly across the collets. This localized differentiation allows high clamping forces to be applied without concentrating stress at single points, thereby preventing tool or workpiece damage.
Solution Approach 2:
The patent employs a mechanical lock that can be activated before or during the clamping process to prevent over-compression of the broaching tool. This lock acts as a cushioning element that limits the maximum clamping force, ensuring that the tool is securely held without risking damage from excessive forces.
3Stability of the object's composition
If the collets are continuously pressurized to maintain clamping force, then tool holding stability improves, but the system complexity and energy consumption increase
Solution Approach 1:
The patent employs a mechanical lock that can be activated periodically or as needed to maintain the clamping force without requiring continuous external pressurization. The lock captures the collets in the clamped position, allowing the system to maintain stable tool holding with minimal energy input rather than requiring continuous hydraulic or pneumatic pressure.
Solution Approach 2:
The mechanical lock system enables the clamping mechanism to maintain its own clamping force without requiring continuous external energy input. Once the collets are positioned and the lock is engaged, the system self-maintains the clamping state through the frictional connection and mechanical interlocking, eliminating the need for continuous pressurization systems.
4Reliability
If a mechanical lock is added to fix the collets in the clamped state, then constant frictional connection is achieved, but the device complexity increases
Solution Approach 1:
The patent integrates the mechanical lock functionality into the existing tool holder structure, combining the locking mechanism with the housing and pressure sleeve assembly. This merging approach allows the mechanical lock to be activated through the existing pressure sleeve displacement mechanism, thereby achieving constant frictional connection without adding completely separate locking components or control 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
The solution effectively prevents the broaching tool from slipping, enabling precise machining and maintaining high clamping forces throughout the process without continuous external pressure, thus enhancing the broaching process's reliability and accuracy.
Implementation Method 1
The active element is formed by balls arranged circumferentially in the gap
Implementation Method 2
displacement of the pressure sleeve with simultaneous locking via the axially movable slide
Implementation Method 3
The inner contour, which is limited in the clamping state by the collets and narrows in the direction of the broaching tool and corresponds to the outer contour of a section of the shaft of the broaching tool
Implementation Method 4
The broaching tool is clamped in on both sides during use
Implementation Method 5
a mechanical lock for fixing the collets in the clamped state. This ensures a constant frictional connection between the tool holder and the broaching tool shank
Data Source
AI summary
The invention relates to an internal broaching machine, comprising a machine frame, in which a machine table having at least one mount for at least one workpiece is arranged, wherein an upper pressing carriage and a lower drawing carriage are movably arranged, which each have a respective tool retainer, wherein at least one tool retainer is in the form of a vice having clamping jaws for radially clamping a broaching tool during the broaching. In the clamping state, the clamping jaws (63) of the at least one tool retainer (6) bound an internal contour (632) that narrows in the direction of the broaching tool (5) and that corresponds to the external contour of a section (52) of the shaft (51) of the broaching tool (5). The invention further relates to a method for the internal broaching of at least two workpieces (4', 4'') by means of an internal broaching machine.