Tool Holder Change Mechanism for Automated Machine Tool Retrofitting
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Solution Overview
Problem
Existing machine tools with tool carriers require cumbersome and time-consuming manual tool changes, especially during machining of smaller lot sizes, and retrofitting with quick change systems is difficult due to the separation of clamping and gripping systems within the tool carrier.
Innovation Solution
A tool change device with integrated gripping means and actuating fastening mechanisms, allowing for automatic and precise tool holder exchange without modifying the tool carrier, utilizing a separate drive unit that can be coupled with handling devices like robots for flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual tool change is used, then operational reliability is maintained through human care, but productivity decreases due to long setup times
Solution Approach 1:
The tool holder is equipped with self-centering elements that automatically align the tool holder with the receptacle during insertion, eliminating the need for manual alignment adjustments and enabling rapid automatic tool changes while maintaining precise positioning
Solution Approach 2:
The patent replaces manual mechanical alignment operations with automatic self-centering mechanical elements, allowing the tool change process to be performed automatically by a robot or handling device without requiring human intervention for precision alignment
2Productivity
If quick change system is implemented, then productivity increases through automatic tool change, but device complexity increases due to clamping system modifications
Solution Approach 1:
The patent extracts the self-centering elements from the tool carrier and integrates them directly into the tool holder, simplifying the tool carrier structure while maintaining automatic tool change capability. The tool holder becomes a self-contained unit with built-in alignment features
Solution Approach 2:
The tool holder design with integrated self-centering elements serves multiple functions: it provides tool mounting, automatic self-alignment with the receptacle, and secure clamping, making it universally applicable to different tool carriers without requiring modifications to the tool carrier structure
3Manufacturing precision
If clamping device with two tie rods is used, then manufacturing precision is improved through precise positioning, but device complexity increases due to multiple clamping elements
Solution Approach 1:
The patent combines the self-centering function with the clamping function into an integrated mechanism. The self-centering elements work in conjunction with the clamping device to achieve precise positioning, eliminating the need for separate alignment mechanisms and reducing overall device complexity
Data Source
AI summary
In a machine tool having a tool carrier (1) that comprises at least one receptacle (4) for a tool holder (3) for driven or stationary tools a tool change device is provided that comprises gripping means (370) for gripping the tool holder (3) at the housing (7) or at part (71) connected with the housing (7). In addition to the gripping means the tool change device comprises a device for actuating the fastening means that are configured for attachment of the tool holder at the tool carrier.