Numerical Control Device Spindle Reference Signal Correction

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Solution Overview

Problem

Existing NC devices require pre-work and dedicated hardware to shift the main spindle single-revolution reference signal, making it difficult to correct the screw cutting starting point and synchronize phases during rotation, and necessitate multiple parameter changes when switching spindle stations.

Innovation Solution

A numerical control device with a main spindle reference angle correction unit that allows arbitrary shifting of the single-revolution reference signal without hardware dependency, using a Z-phase signal correction mechanism to adjust the reference point and command position, enabling software-based corrections for phase matching across operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If dedicated hardware and pre-work are used to shift the main spindle single-revolution reference signal, then the reference signal can be shifted, but the device complexity increases and pre-processing time is required

Engineering Contradiction:

Improvescrew cutting starting point accuracyVSAvoidhardware complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces the dedicated hardware mechanism with a software-based correction approach. The main spindle reference angle correction amount setting unit allows numerical input of correction values, and the correction units apply these corrections through computational processing of the Z-phase signal and command positions, eliminating the need for complex hardware modification while achieving the same reference signal shifting function

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a main spindle reference angle correction amount as a adjustable parameter that can be numerically set. This parameter is applied through correction units that modify the Z-phase signal timing and command positions dynamically, allowing flexible adjustment of the reference signal without hardware changes. The correction amount can be modified through parameter settings rather than hardware reconfiguration

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If multiple parameters are changed when switching spindle stations, then the phase matching can be achieved, but the processing time increases and productivity decreases

Engineering Contradiction:

Improvephase matching accuracyVSAvoidprocessing speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent combines multiple correction functions into unified correction units. The main spindle within-single-revolution feed-back position correction unit and the main spindle within-single-revolution command position correction unit work together to simultaneously correct both the feedback position and command position based on a single reference angle correction amount, reducing the number of separate parameter adjustments needed when switching spindle stations

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent allows the main spindle reference angle correction amount to be set in advance before spindle station switching occurs. The correction units are pre-configured to apply the correction automatically when needed, so that when a spindle station is switched, the phase matching correction is already in place rather than requiring multiple parameters to be adjusted during the switching process

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the main spindle reference angle is corrected during rotation, then the correction can be applied dynamically, but the control complexity increases

Engineering Contradiction:

Improvedynamic correction capabilityVSAvoidcontrol system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent employs feedback mechanisms where the main spindle within-single-revolution feed-back position correction unit continuously monitors the actual spindle position and compares it with the corrected reference position. The correction is applied based on feedback from the actual rotational state, allowing dynamic adjustment during rotation while maintaining control through closed-loop comparison and correction

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8836265B2Numerical control device

Publication Date: 2014.09.16 MITSUBISHI ELECTRIC CORP

AI summary

In order to obtain an NC device that can easily shift by an arbitrary amount a main spindle single-revolution reference signal without being dependant on hardware and while rotating a main spindle, the NC device includes a main spindle reference angle correction amount setting unit for inputting a correction angle of a reference point, a main spindle within-single-revolution feed-back position correction unit for correcting the reference point by a correction angle set by the main spindle reference angle correction amount setting unit, and a main spindle within-single-revolution command position correction unit for correcting a main spindle within-single-revolution command position by the correction angle set by the main spindle reference angle correction amount setting unit.