1、INTERNATIONAL TRUCK AND ENGINE CORPORATION Engineering Design Standards NUMBER: EDS-A16 TITLE: Key Control Characteristics (KCC) CURRENT ISSUE DATE: OCTOBER 2003 WRITTEN/REVIEWED BY: J. Dewayne Dimit/Esther F. Rice APPROVED BY: Corporate Standards Committee SUPERSEDES ISSUE OF: April 2002 PRINTED CO
2、PIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION Change Notice: Reformatted to outline type format; Added SPC detail; Released with minor changes to original release which did not show in the Index. 1.0 INTRODUCTION: This standard establishes that Key Control Characteristics (KCC) are the
3、 vehicle by which the Engineering community may identify, on part prints or installations, features that must be managed by Statistical Process Control (SPC). 2.0 ACRONYMS: KCC Key Control Characteristics SPC Statistical Process Control FMEA - Failure Mode Effect Analysis TMS - Truck Material Specif
4、ication 3.0 APPLICATION: The application of KCC should be limited to the vital few characteristics (5% of total characteristics maximum) of the part print or installation diagram. Releases of drawings that specify KCC type control on more than 5% of the characteristics must be approved by the approp
5、riate Chief Engineer in a letter that accompanies the Release Letter. All newly released part prints may be required to indicate at least one (1) KCC per part. The selection of the characteristics should be derived from SPC, FMEA field history, or design objective. The identification of the characte
6、ristics for KCC management must be reviewed with a manufacturing representative or supplier (if they are known) as part of the design process. Low volume parts do not warrant the application of SPC and thus should have no KCC applied to the drawing. If a dimension on a low-volume part is critical to
7、 its installation, then application of 100% inspection techniques should be considered. 3.1 In cases where the part or product being designed is a member of a family of parts having similar features, KCC requirements may be assigned to the family of parts by means of a general product specification
8、such as the TMS. 3.2 When processing revisions to any previously released production part drawings, application of KCC type controls is not mandatory, but should be considered. If KCC application to a drawing is decided upon, the following guideline shall be adhered to: 3.3 Engineering shall consult
9、 the parts control plan, or written information from the supplier, which specifies what feature of the part is presently being controlled with SPC. This identified characteristic should be considered for application of the KCC symbol ( KCC ). This document is restricted and may not be sent outside I
10、nternational Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2003 by International Truck and Engine Corporation. OCTOBER 2003 Page 1 of 3 Copyright Navistar International Corporation Provided by
11、IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: TITLE: CURRENT ISSUE DATE: EDS-A16 Key Control Characteristics (KCC) OCTOBER 2003 The application of SPC methods to selected manufacturing processes and the designation of specific
12、 product features as KCCs shall be based upon the following: 3.3.1 Part characteristics and process variables that significantly influence the product quality or its design integrity-possibly derived from FMEA 3.3.2 Repetitive type service complaints are identified by Pareto Analysis or other approv
13、ed methods. 3.3.3 Qualified review of design objectives, product drawings, process specifications, and warranty claims. 3.3.4 Critical and/or major characteristics identified by customer. 3.4 KCC Selection Guide: Evaluate each tolerance, and determine if the part would be usable if the process capab
14、ility (Cpk) was as low as 0.5 out of tolerance by a factor of 2. If not, this characteristic is a prime candidate for KCC control. 4.0 SYMBOLIZATION: The KCC symbol( KC )and KCC definition block stamps should be utilized as shown in Figure I, see below. These stamps are available in the various Inte
15、rnational Engineering Design Stamp Libraries (Unigraphics, IDEAS, Manual, etc.). C4.1 For families of parts, the KCC symbol may be used with a note indicating compliance with the KCC requirement of the general product specification (CEMS, TMS,etc) for that family of parts. This document is restricte
16、d and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2003 by International Truck and Engine Corporation. OCTOBER 2003 Page 2 of 3 Copyright Navistar Interna
17、tional Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: EDS-A16 TITLE: Key Control Characteristics (KCC) CURRENT ISSUE DATE: OCTOBER 2003 This document is restricted and may not be sent outside Internation
18、al Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2003 by International Truck and Engine Corporation. OCTOBER 2003 Page 3 of 3 1KCC symbol to be used as characteristic identification.Placement o
19、f symbol should be to the left of characteristic and as close as practical.2Leader from symbol to specific characteristic (when symbol is remote).3Locate KCC definition stamp left of Title Block.1 21.71Remote Location Optional (locate as required)B .062BOTH SIDES.16.16Finish per TMS 9009.Class IIKEY
20、 CONTROL CHARACTERISTICSThe key control characteristics symbol identifies thoseitems which defined process controls and statisticalapplication are mandatory. All other characteristicsare to be within defined specifications.3INTERNATIONAL+If part is one of a family of parts whose KCC control is speci
21、fied in that parts general specifications, anote and stamp should be added to the drawing directing users to that specification. Example:Finish per TMS 9009.Class IISIZE2KEY CONTROL CHARACTERISTICSThe key control characteristics symbol identifies thoseitems which defined process controls and statist
22、icalapplication are mandatory. All other characteristicsare to be within defined specifications.SEE TMS-XXXX REQUIREMENTSSIZE2FIGURE 1FIGURE 1KCCKCCKCCKCCKCCCopyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
