Machining Center Tool Transfer Arm for Safer Tool Replacement
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Solution Overview
Problem
The existing methods for loading and replacing tools in machining centers with mechanized tool magazines are inefficient, as they require manual access to a tool holding drum located in an awkward and often risky position, especially in larger machines, which can lead to safety issues and production halts when robots are used for part loading/unloading.
Innovation Solution
An automatic transfer device with an articulated arm is introduced to pick up worn tools from the spindles and transfer them to a user-accessible area for replacement, allowing operators to perform tool changes in a safer and more ergonomic manner without affecting the machine's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool holding drum is arranged in a recessed position in larger machining centers, then the machine structure is optimized for machining operations, but the operator must climb ladders and access awkward positions for tool replacement, increasing safety risks and operational difficulty
Solution Approach 1:
A robotic arm serves as an intermediary device between the operator and the tool holding drum. The robot autonomously navigates to the drum, grasps tools, and transfers them to the spindles, eliminating the need for operators to physically access the recessed drum position while maintaining full tool replacement capability
Solution Approach 2:
The system enables self-service tool replacement where the robotic arm independently performs the entire tool change process without human intervention. The robot autonomously identifies, grasps, and transfers tools between the drum and spindles, making the system self-sufficient for tool management tasks
2Ease of operation
If manual tool replacement is performed while a robot loads/unloads parts, then the machine can be operated, but the robot must be halted for safety reasons, causing production stops
Solution Approach 1:
The robotic arm performs tool replacement autonomously without requiring human operators to manually intervene during part loading/unloading operations. This self-service capability allows the system to handle both tool management and part handling simultaneously, maintaining continuous production
3Ease of manufacture
If tools are manually loaded and replaced by operators climbing ladders, then tool changes can be performed, but the operation becomes awkward and risky especially when tools weigh more than 10 kg
Solution Approach 1:
The robotic arm acts as a mediator that handles heavy tools (exceeding 10 kg) between the tool holding drum and spindles. This eliminates direct human contact with heavy tools and awkward ladder climbing, transferring the physical burden to the robot while maintaining full tool replacement functionality
Solution Approach 2:
The system replaces the manual mechanical operation of climbing ladders and physically handling heavy tools with an automated robotic system. The robot's mechanical arm and gripper mechanism substitute for human physical effort, eliminating safety risks associated with manual heavy tool handling
Data Source
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AI summary
In a machining center provided with a mechanized tool magazine (32) and with at least one movable tool-holding spindle (18, 20) capable of accessing the tool magazine (32), the tool is picked up from the tool-holding spindle (18, 20) and transferred to a tool replacement area (38) by means of a dedicated, automatic transfer device (34) that is independent of the tool magazine (32). After the replacement of the tool with a new tool in the transfer device (34), the new tool is returned to the tool-holding spindle (18, 20) by means of the transfer device (34).