C-Axis Head Platform Layout for Endless Rotation and Rigid Drive
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Solution Overview
Problem
Current 5-axis machine tools face challenges in dynamic performance, configurability, and modularity due to complex cable management, limited angular travel, and torsional rigidity, which restricts machining speed and accuracy, especially in high-speed cutting applications.
Innovation Solution
The C-axis unit design integrates the spindle motor directly with the head mounting platform, eliminating the need for a long transmission shaft, allowing for improved cable routing, increased angular travel, and the use of a slip ring for endless rotation, reducing friction and enhancing dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a long transmission shaft is used to connect the spindle motor to the head mounting platform, then the motor can be positioned away from the rotation axis, but the cable management becomes complex and the system suffers from torsional rigidity issues
Solution Approach 1:
The invention extracts the spindle motor from its traditional position on the ram and relocates it directly to the head mounting platform. This eliminates the long transmission shaft and associated cable routing problems by removing the intermediate mechanical connection that caused torsional rigidity issues and complex cable management requirements.
Solution Approach 2:
The invention merges the spindle motor directly with the head mounting platform, creating an integrated assembly where the motor rotates with the platform. This combination eliminates the need for a separate transmission shaft and simplifies the overall system architecture while improving dynamic performance.
2Device complexity
If the head mounting platform is limited in angular travel, then cable management is simplified, but the machining capability for complex geometries is restricted
Solution Approach 1:
The invention replaces the mechanical cable routing system with an electrical cable connection system using slip rings. This substitution allows the head mounting platform to rotate through larger angles and even perform endless rotations while maintaining reliable electrical connections, thereby expanding machining capability without proportionally increasing mechanical complexity.
3Speed
If friction in the rotary joint is reduced, then dynamic performance improves, but the reliability of fluid and electrical connections may be compromised
Solution Approach 1:
The invention replaces mechanical friction-based connections with electrical slip ring contacts for fluid and electrical transmission. This substitution maintains reliable connections while allowing frictionless rotation, thereby improving dynamic performance and rotation speed without compromising connection reliability.
4Speed
If the spindle motor is integrated with the head mounting platform, then dynamic performance and rotation speed increase, but the motor positioning and cooling become more challenging
Solution Approach 1:
The invention relocates the spindle motor from the vertical Z-axis direction to the horizontal radial direction of the head mounting platform. This dimensional change allows cooling air to be supplied from the radial direction, improving heat dissipation efficiency while maintaining the motor's integrated position on the rotating platform.
Data Source
AI summary
A C-axis unit for a machine tool, the C-axis unit comprising a bushing (134) adapted to be fixed to a unit support (121) of the machine tool; a head mounting platform (130) adapted to receive an operating head (40), the head mounting platform being supported by the bushing (134) and being rotatable relative to the bushing (134) around a vertical axis; a platform rotation motor (150) supported by the bushing (134) and configured to control the rotation of the head mounting platform (130); and a spindle motor (160) configured to control the rotation of a tool-carrying spindle (45) on the operating head (40) through a driving extension (163) arranged in a through-bore (133) obtained through the head mounting platform (130). The spindle motor (160) is fixed to and is rotationally integral with the head mounting platform (130).