Machining Simulation Tool Model Segmentation for Interference Detection

Solution Overview

Problem

Conventional machining simulation apparatuses face issues with accurately detecting interference between tool and material models due to computational errors and the need for wide allowable values, leading to potential undetection of contact or erroneous identification of interference.

Innovation Solution

The apparatus employs a machining tool model for cutting and a smaller interference check tool model for interference detection, eliminating the need for volume calculations and reducing calculation errors by using distinct tool models for different purposes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single tool model is used for both cutting and interference check, then the system complexity is reduced, but measurement precision deteriorates due to computational errors in detecting interference

Engineering Contradiction:

Improvesystem complexityVSAvoidinterference detection precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The tool model is segmented into two distinct models: a machining tool model for cutting simulation and an interference check tool model for interference detection. This segmentation allows each model to be optimized for its specific function, thereby improving measurement precision without significantly increasing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the tool representation serve different functions with different quality requirements. The cutting tip region requires high precision for material removal simulation, while the shank region requires interference detection capability. By applying local quality differentiation through separate models, the system achieves high precision in both aspects.

Inventive Principle:

Principle #3Local quality

2Device complexity

If a single tool model is used for both cutting and interference check, then device complexity is reduced, but reliability deteriorates due to erroneous interference detection

Engineering Contradiction:

Improvesystem complexityVSAvoidinterference check reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The tool model is segmented into two distinct models: a machining tool model for cutting simulation and an interference check tool model for interference detection. This segmentation allows each model to be optimized for its specific function, thereby improving measurement precision without significantly increasing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interference check tool model acts as an intermediary between the machining process and the interference detection system. It provides accurate interference information without being affected by computational errors in the cutting simulation, thereby improving reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the tool model is defined as a cylinder or polygonal column, then ease of manufacture is improved, but manufacturing precision deteriorates due to computational errors in removing cutting regions

Engineering Contradiction:

Improvemodel definition simplicityVSAvoidcutting region removal precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The tool model is segmented into two distinct models: a machining tool model for cutting simulation and an interference check tool model for interference detection. This segmentation allows each model to be optimized for its specific function, thereby improving measurement precision without significantly increasing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A simplified copy of the tool model (interference check tool model) is created specifically for interference detection purposes. This copy maintains the essential geometric features needed for interference checking while avoiding the computational complexities of the detailed cutting simulation model.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS8175858B2Machining simulation apparatus

Publication Date: 2012.05.08 OKUMA CORP

AI summary

A machining simulation apparatus (1) includes a model storage (4) for storing information about machining models (11) that define mechanical elements, such as spindle heads and tables, jig models (12) that define jigs, such as chucks and holders, material models (13) that defines the shapes of workpieces, and tool models (14) that defines the shapes of tools for machining the workpieces. Each tool model comprises a machining tool model (14A) and an interference check tool model (14B). A material model is machined with the machining tool model (14A) according to an axis movement command for cutting feed so as to update the shape of the material model. Subsequently, interference of the interference check tool model with the material model, jig models, and machine models are checked for according to an axis movement command for rapid traverse.