Rotary Guide Bush Gap Control in Synchronous Spindle Machining
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Solution Overview
Problem
Existing machine tools struggle to automatically adjust the gap between a bar and a rotary guide bush synchronously rotating with the spindle, which is necessary for stable and precise machining.
Innovation Solution
A machine tool configuration that includes a front spindle, a rotary guide bush, and a control device with a guide bush opening degree determining section, which adjusts the gap by determining the adjustment amount based on the rotation angle of the front spindle drive motor, allowing the rotary guide bush to rotate synchronously with the spindle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the guide bush rotates synchronously with the spindle, then machining stability and precision are improved, but the gap between the bar and guide bush cannot be automatically adjusted
Solution Approach 1:
The system uses the rotational motion of the bar itself (caused by back spindle rotation) to drive the adjusting nut, which in turn adjusts the guide bush opening degree. The bar's own rotation serves the dual purpose of machining preparation and gap adjustment, eliminating the need for separate adjustment mechanisms.
Solution Approach 2:
The adjusting nut serves multiple functions: it both adjusts the guide bush opening degree and is driven by the bar's rotation during the machining setup process. The back spindle's rotation serves both to position the bar and to drive the adjustment mechanism through the rotating jig engagement.
2Ease of operation
If the gap between bar and guide bush is manually adjusted, then adjustment simplicity is maintained, but machining precision and stability deteriorate
Solution Approach 1:
The system uses the encoder to detect the rotation angle of the front spindle drive motor, which reflects the actual gap condition through the mechanical coupling. This feedback allows the control device to automatically determine the optimal adjustment amount and execute precise adjustment, replacing manual trial-and-error methods.
3Device complexity
If the guide bush does not rotate synchronously with the spindle, then the adjusting mechanism is simpler, but the bar sticks to the guide bush and surface properties deteriorate
Solution Approach 1:
The guide bush is designed to rotate synchronously with the spindle, changing from a static to a dynamic configuration. This dynamic rotation prevents the bar from sticking to the guide bush by maintaining relative motion, thereby preserving the bar's surface properties while enabling precise machining.
Data Source
AI summary
A machine tool has a front spindle that rotatably holds a bar, a front spindle drive motor that rotationally drives the front spindle, an encoder that detects a rotation angle of the front spindle drive motor, a rotary guide bush that is installed on a guide bush support in front of the front spindle to support the bar extending from the front spindle while allowing the bar to rotate around a rotation axis and move in a rotation axis direction and rotate synchronously with the front spindle, a back spindle that is arranged opposite to the front spindle and rotatably holds the bar, a back spindle drive motor that rotationally drives the back spindle, and a controller that controls operations of the front spindle and the back spindle.