Fraction defective estimating method, system for carrying out the same and recording medium

• US 6,108,586 A
• Filed: 03/27/1998
• Issued: 08/22/2000
• Est. Priority Date: 03/31/1997
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Suzuki, Tatsuya, Kubota, Takashi, Asano, Masaaki, Ohashi, Toshijiro, Miyakawa, Seii
• Primary Examiner(s): Palys, Joseph E.
• Assistant Examiner(s): Mai, Rijue
• Application Number:
  US09/048,988
• Time in Patent Office: 879 Days
• Field of Search: 700/117, 700/21, 700/39, 700/44, 700/52, 700/81, 700/83, 700/88, 700/108, 700/109, 700/110, 700/115, 700/118-120, 700/123, 700/213, 702/182-185, 702/81-84
• US Class Current: 700/117
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling

Abstract

A method and a system for estimating an assembling-related fraction defective coefficient of an article in the stage preceding to manufacturing, e.g. at a stage of design. Assembling operation, properties/conditions of parts to be assembled and conditions of an assembling shop having significant influence to the likelihood of occurrence of failure in assembling work are inputted as data. Estimated value of assembling-related fraction defective is arithmetically determined with high accuracy by executing an assembling-related fraction defective value estimating program on the basis of the data as inputted.

Claims

1. A fraction defective estimating method, wherein stored previously are fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article and second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts, comprising:

a step of inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part;

a step of extracting relevant ones of said first and second supplementary coefficients by using said first and second input information;

a step of extracting a relevant fraction defective coefficient by using said third input information; and

a step of determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing said extracted fraction defective coefficient with said first and second extracted supplementary coefficients.

2. A fraction defective estimating method according to claim 1, wherein stored previously is a fourth supplementary coefficient corresponding to presence or absence of a process for confirming whether said attachment-destined part has been properly attached to said attachment-subjected part, comprising:

a step of determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing additionally said extracted fraction defective coefficient with said fourth supplementary coefficient in the case where said process for confirming whether said attachment-destined part has been properly attached to said attachment-subjected part exists.

3. A fraction defective estimating method according to claim 1, wherein properties of said attachment-destined part or said attachment-subjected part includes at least one of shape, dimensional precision, surface state, size, weight, material and function.

4. A fraction defective estimating method according to claim 1, wherein said standard attaching operation includes a positioning/attaching operation.

5. A fraction defective estimating method according to claim 1, wherein said fraction defective coefficients include at least a fraction defective coefficient relating to path control failure and a fraction defective coefficient relating to operative-effort-insufficiency-ascribable failure.

6. A fraction defective estimating method according to claims 1, wherein said supplementary coefficients include at least a supplementary coefficient relating to path control failure and a supplementary coefficient relating to operative-effort-insufficiency-ascribable failure.

7. A fraction defective estimating method, wherein stored previously are fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article, second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts and third supplementary coefficients separately for numbers of said standard attaching operations involved in attachments of said attachment-destined parts to said attachment-subjected parts, respectively, comprising:

a step of inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part;

a step of extracting relevant ones of said first, second and third relevant supplementary coefficients by using said first and second input information and a number of the standard attaching operations arithmetically determined on the basis of said third input information;

a step of extracting a relevant fraction defective coefficient by using said third input information; and

a step of determining arithmetically an attachment-related fraction defective of said object under evaluation by supplementing said extracted fraction defective coefficient with said first, second and third extracted supplementary coefficients.

8. A fraction defective estimating method, wherein stored previously are fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article, second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts and third supplementary coefficients separately for sequential positions of said standard attaching operations involved in attachments of said attachment-destined parts to said attachment-subjected parts, respectively, comprising:

a step of inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part;

a step of extracting relevant ones of said first, second and third supplementary coefficients by using said first, second and third input information;

a step of extracting a relevant fraction defective coefficient by using said third input information; and

a step of determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing said extracted fraction defective coefficient with said first, second and third extracted supplementary coefficients.

9. A fraction defective estimating system, comprising:

storage means for storing fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article and second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts,

input means for inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part; and

arithmetic means including first extracting means for extracting relevant ones of said first and second supplementary coefficients by using said first and second input information, second extracting means for extracting a relevant fraction defective coefficient by using said third input information, and arithmetic operation means for determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing said extracted fraction defective coefficient with said first and second extracted supplementary coefficients.

10. A fraction defective estimating system according to claim 9, wherein properties of said attachment-destined part or said attachment-subjected part includes at least one of shape, dimensional precision, surface state, size, weight, material and function.

11. A fraction defective estimating system according to claim 9, wherein said standard attaching operation includes positioning/attaching operation.

12. A fraction defective estimating system according to claim 9, wherein said fraction defective coefficients include at least a fraction defective coefficient concerning path control failure and a fraction defective coefficient concerning operative-effort-insufficiency-ascribable failure.

13. A fraction defective estimating system according to claim 9, wherein said supplementary coefficients include at least a supplementary coefficient concerning path control failure and a supplementary coefficient concerning operative-effort-insufficiency-ascribable failure.

14. A fraction defective estimating system, comprising:

storage means for storing fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article, second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts and third supplementary coefficients separately for numbers of said standard attaching operations involved in attachments of said attachment-destined parts to said attachment-subjected parts, respectively,

input means for inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part; and

arithmetic means including first extracting means for extracting relevant ones of said first, second and third supplementary coefficients by using said first and second input information and a number of the standard attaching operations arithmetically determined on the basis of said third input information, second extracting means for extracting a relevant fraction defective coefficient by using said third input information, and arithmetic operation means for determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing said extracted fraction defective coefficient with said first, second and third extracted supplementary coefficients.

15. A fraction defective estimating system, comprising:

storage means for storing fraction defective coefficients separately for individual standard attaching operations resulting from classification of attaching operations involved in assembling an article, first supplementary coefficients separately for properties of attachment-destined parts constituting said article, second supplementary coefficients separately for properties of attachment-subjected parts constituting said article in cooperation with said attachment-destined parts and third supplementary coefficients separately for sequential positions of said standard attaching operations involved in attachments of said attachment-destined parts to said attachment-subjected parts, respectively,

input means for inputting at least first information representing properties of an attachment-destined part of an object under evaluation, second information representing properties of an attachment-subjected part of said object under evaluation and third information representing a standard attaching operation or operations involved in attachment of said attachment-destined part to said attachment-subjected part; and

arithmetic means including first extracting means for extracting relevant ones of said first, second and third supplementary coefficients by using said first, second and third input information, second extracting means for extracting a relevant fraction defective coefficient by using said third input information, and arithmetic operation means for determining arithmetically an attachment-related fraction defective for said object under evaluation by supplementing said extracted fraction defective coefficient with said first, second and third extracted supplementary coefficients.

16. A fraction defective estimating system according to claim 15, wherein said storage means stores a fourth supplementary coefficient corresponding to presence or absence of a process for confirming whether said attachment-destined part has been properly attached to said attachment-subjected part is stored, and

wherein said arithmetic means determines arithmetically an attachment-related fraction defective of said object under evaluation by supplementing additionally said extracted fraction defective coefficient with said fourth supplementary coefficient in the case where said process for confirming whether said attachment-destined part has been properly attached to said attachment-subjected part exists.

17. A recording medium, storing:

fraction defective coefficients for every standard attaching operation of attachment-destined parts;

supplementary coefficients for every property of attachment-destined parts;

supplementary coefficients for every property of attachment-subjected parts; and

a program for arithmetically determining an assembling-related fraction defective of an object under evaluation, wherein said object under evaluation is expressed in terms of a combination of said standard attaching operations, and wherein said program is so designed that when information concerning said combination and properties of an attachment-destined part and an attachment-subjected part constituting said object under evaluation are inputted, relevant ones of the fraction defective coefficients of standard attaching operations, supplementary coefficients relating to the attachment-destined parts and supplementary coefficients relating to the attachment-subjected parts are extracted from the input information, respectively, for thereby arithmetically determining an assembling-related fraction defective for said object under evaluation by adding together values obtained by supplementing the extracted individual fraction defective coefficients with the supplementary coefficients relating to said attachment-destined part and the supplementary coefficients relating to said attachment-subjected part.