Tool Trajectory Display Device for Repetitive Shape Comparison

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Solution Overview

Problem

Conventional tool trajectory display devices struggle to accurately compare and evaluate the shapes of repetition portions with identical machining conditions but different start positions on the same coordinate system, particularly in machining processes involving repetitive and symmetric shapes.

Innovation Solution

A tool trajectory display device that includes a numerical control system, actual position data acquisition, start point coordinate storage, movement amount determination, and trajectory calculation units to calculate and superimpose actual and instruction trajectories, allowing for precise comparison of repetition portions by translating or rotating start point coordinate positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional trajectory display devices display feedback trajectories with different machining conditions on the same coordinate system, then the change in trajectory data can be visually analyzed, but it is difficult to display and compare repetition portions with identical machining conditions and different machining start positions with high precision

Engineering Contradiction:

Improveability to display multiple trajectory typesVSAvoidprecision of repetition portion comparison

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the trajectory data into distinct categories: first trajectory data with different machining conditions and second trajectory data with identical machining conditions but different start positions. This segmentation allows each type to be processed and displayed according to its specific requirements, resolving the contradiction between versatility and precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary coordinate transformation process that converts second trajectory data (with different start positions) into a unified coordinate system where they can be precisely superimposed and compared. This intermediary transformation enables high-precision comparison of repetition portions while maintaining the ability to display both types of trajectory data.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If multiple superimposed pieces of trajectory data with different machining start positions are displayed on the same coordinate system, then comparison of repetition portions becomes possible, but the device complexity increases

Engineering Contradiction:

Improveprecision of trajectory comparisonVSAvoidcomplexity of coordinate transformation system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements a universal coordinate transformation mechanism that can handle both first trajectory data (different machining conditions) and second trajectory data (identical conditions, different start positions). This multi-functional approach enables precise comparison of repetition portions without requiring separate complex systems for each trajectory type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the coordinate parameters of trajectory data through mathematical transformation. By applying coordinate transformation to second trajectory data, the system aligns repetition portions with different start positions onto the same coordinate system, enabling precise comparison while maintaining system efficiency through parameter manipulation rather than physical system expansion.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If trajectory data with identical machining conditions and different start positions are transformed to the same coordinate system, then high-precision comparison of repetition portions is achieved, but the processing time and computational load increase

Engineering Contradiction:

Improveprecision of repetition portion evaluationVSAvoidtime for trajectory processing

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary coordinate transformation on second trajectory data before display, converting multiple trajectory datasets with different start positions into a unified coordinate system in advance. This preliminary action enables high-precision comparison of repetition portions during display without requiring real-time computational processing, thereby reducing processing time and computational load.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9557729B2Tool trajectory display device including display unit for trajectory data

Publication Date: 2017.01.31 FANUC LTD

AI summary

The tool trajectory display device (10) includes: a start point coordinate storing unit (13) that stores a plurality of coordinate positions of a drive shaft as start point coordinate positions; a movement amount determining unit (14) that determines a movement amount of the drive shaft from a first start point coordinate position to a second start point coordinate position; a trajectory calculation unit (15) that calculates a first actual trajectory of a tool tip point of the machine tool from the actual position based on the first start point coordinate position after adding the movement amount and the repetition portion, and that calculates a second actual trajectory of the tool tip point from the actual position based on the second start point coordinate position and the repetition portion; and a display unit (16) that superimposedly displays the first and the second actual trajectories.