Method and apparatus for quantifying dimensional variations and process capability

A technology of process measurement and deviation, applied in the field of determination of size deviation, can solve problems such as uncertainty, error, and difficult to determine parts manufacturing problems

Inactive Publication Date: 2016-03-09
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes uncertainty and error when determining the process capability of a part and makes it difficult to determine which points of the part are causing manufacturing problems

Method used

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  • Method and apparatus for quantifying dimensional variations and process capability
  • Method and apparatus for quantifying dimensional variations and process capability
  • Method and apparatus for quantifying dimensional variations and process capability

Examples

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Embodiment Construction

[0110] exist Figure 3A , a design similar to that of Figure 1A for a simple triangular part is shown. design point A 0 , B 0 and P 0 Restricted to design parts. exist Figure 3B shown in the Figure 3A The measurement of the manufactured parts of the design. These measurements may be taken using a coordinate measuring machine or provided using a stylus manually positioned by an operator. These measurement points are A m , B m and P m .

[0111] Note that the manufactured part appears to be rotated relative to the designed part. The rotation can be created based on how the part is attached to the measurement fixture. For example, debris buildup on the fixture itself or on the part can cause the part to sit on the fixture at an angle. Usually, the rotation will be less noticeable than that shown, so for illustration purposes the Figure 3B enlarge.

[0112] According to the present invention, the measurement point of the manufactured part is converted and then rota...

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PUM

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Abstract

The invention relates to a method and apparatus for quantifying dimensional variations and process capability independently of datum points, and, more specifically, relates to a measurement system which receives design values specifying measurement points of a first design and values corresponding to measurement points of a first part manufactured according to the first design using a first process. The system calculates a reference point of the first part and translates the received values based on a difference between reference points of the first part the first design. The system includes a rotation module that applies a rotational transformation with a first angle to the translated values. The system includes an error minimization module that determines a first value for the first angle that minimizes deviations between the transformed values and the specified design values. The system includes an error determination module that computes deviations between the transformed values and the specified design values. The system includes an analysis module that calculates a process metric of the first process based on the computed deviations.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 021,582, filed July 7, 2014. The entire contents of the aforementioned patent applications are incorporated herein by reference. technical field [0003] The present invention relates to the determination of dimensional deviations of manufactured parts, and more particularly to the quantification of dimensional deviations and process capability independent of datum points. Background technique [0004] When designing a part, such as a vehicle component, manufacturing tolerances may be assigned to various dimensions and features of the designed part. In preparation for manufacturing a part in series, one or more test runs of the part may be performed. The manufactured test parts are measured to determine how closely they conform to the defined specifications of the designed part. These comparisons can be used to calculate manufacturing pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00
CPCG05B19/41875G06Q10/06Y02P90/02
Inventor H-T·范
Owner GM GLOBAL TECH OPERATIONS LLC
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