Hybrid Joint-Parallel Robot Machining for Stiff Precision Cutting
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Solution Overview
Problem
Conventional milling processes using CNC machining centers are limited in size, inefficient for complex parts, costly, and inflexible, with six-axis robots suffering from low stiffness affecting accuracy.
Innovation Solution
An assembly comprising a parallel robot mounted on a joint robot, allowing the servo spindle to translate along axes while the joint robot remains stationary, enhancing flexibility and stiffness, and including a positioner, tool changer, and lubricating device for improved machining accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a six-axis joint robot is used to hold the milling cutter, then flexibility and accessibility are improved, but stiffness decreases and machining accuracy is adversely affected
Solution Approach 1:
The system is divided into two functional segments: the joint robot (providing flexibility and positioning) and the parallel robot (providing stiffness and cutting precision). Each segment performs its specialized function, resolving the contradiction between flexibility and accuracy.
Solution Approach 2:
The patent combines a joint robot and a parallel robot into a hybrid system. The joint robot provides flexible positioning while the parallel robot provides stiff, accurate cutting motion, achieving both flexibility and machining accuracy simultaneously.
2Manufacturing precision
If a CNC machining center is used to achieve high-accuracy machining, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical structure of a traditional CNC machining center with a hybrid robot system. The parallel robot provides the necessary stiffness for accurate cutting without requiring the complex multi-axis mechanical structure of conventional machining centers.
3Manufacturing precision
If a parallel robot is used to drive the servo spindle, then stiffness and machining accuracy are improved, but device complexity increases
Solution Approach 1:
The system segments functionality between the joint robot (positioning) and parallel robot (cutting). This segmentation allows the parallel robot to be relatively simple in structure while still providing high stiffness and accuracy for the cutting operation.
Data Source
AI summary
An assembly and an apparatus for machining a mechanical part. The assembly includes a parallel robot configured to be mounted onto an end flange of a joint robot. The parallel robot is configured to drive the servo spindle to translate along the one or more axes with respect to the parallel robot. During the machining of the mechanical part, the joint robot can stay stationary for a specific machining position of the mechanical part, and the parallel robot drives the servo spindle to translate along the one or more axes. Then, the machining tool may cut out the required shapes and characteristics at the specific machining position of the mechanical part.