Numerical Control Device for Synchronized Tapping
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Solution Overview
Problem
Conventional machining systems with X, Z, H, and C axes struggle to perform synchronized tapping processes on both surfaces of a workpiece simultaneously due to differences in acceleration and deceleration patterns and time constants of motors with the same axis names, leading to unsynchronized movements and potential deformation of screw threads.
Innovation Solution
A numerical control device that synchronizes the movements of X, H, and S axes by selecting the larger time constant for acceleration and deceleration, calculating movement amounts, and transferring rotation data to ensure simultaneous synchronized tapping on both surfaces, using a main set and a sub-set arranged point-symmetrically with respect to a single C axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional machining systems use motors with the same axis names for both surfaces, then the machine structure is simplified, but the acceleration and deceleration patterns differ causing unsynchronized movements
Solution Approach 1:
The patent applies parameter changes by introducing different time constants (T1 and T2) for the two motors despite them having the same axis names. The numerical control device stores and uses these distinct time constants to calculate acceleration and deceleration movements, ensuring synchronized operation. This resolves the contradiction by maintaining simple machine structure while achieving reliable synchronization through parameter differentiation.
2Productivity
If the machine performs synchronized tapping on both surfaces simultaneously, then productivity is doubled, but the complexity of control increases due to needing to coordinate multiple axes and spindles
Solution Approach 1:
The patent uses copying by transferring the rotation amount calculated for the S1 axis to the S2 axis as synchronization data. Instead of independently controlling both spindles, the system calculates for one and copies to the other, simplifying the control system while maintaining synchronized tapping on both surfaces, thus achieving doubled productivity without proportionally increasing control complexity.
Solution Approach 2:
The numerical control device acts as an intermediary by introducing a central coordination mechanism that manages the time constants and transfers rotation data between the two sets of axes. This intermediary handles the complexity of coordinating multiple axes and spindles, allowing simultaneous synchronized tapping while keeping the control architecture manageable through centralized data management.
3Adaptability or versatility
If the machine uses point-symmetric arrangement of main set and sub-set, then the machining capability for both surfaces is enhanced, but the difficulty of detecting and measuring synchronization increases
Solution Approach 1:
The patent implements feedback by having the numerical control device continuously monitor and adjust the rotation amounts transferred from S1 to S2 axis based on the stored time constants. This feedback mechanism ensures that despite the point-symmetric arrangement making detection difficult, the system maintains accurate synchronization by constantly referencing the predetermined time constant relationships and adjusting accordingly.
Data Source
AI summary
A numerical control device including tapping spindle (S1, S2) time constant selecting means that compares acceleration and deceleration time constants of the S1 and S2 axes and selects the larger time constant, drilling axis (X1) acceleration and deceleration processing means that calculates an acceleration and deceleration movement amount of the X1 axis based on the selected spindle time constant and a commanded spindle rotation number and moves the drilling axis to the calculated position, synchronized tapping interpolation processing means that synchronizes the tapping spindle with the drilling axis based on the movement amount output from the drilling axis (X1) acceleration and deceleration processing means and a pitch, and tapping spindle synchronization processing means that transfers the rotation amount of the tapping spindle output from tapping spindle (S1)-drilling axis (X1) synchronization processing means to the synchronized side.