Standard No.:	QC/T 268-2023
English Name:	Permissible automobile cold stamping variations in dimensions without tolerance indication
Chinese Name:	汽车冷冲压加工零件未注公差尺寸的极限偏差
Chinese Classification:	T33    Lubricating parts, seals and connecting pieces
Professional Classification:	QC    Professional Standard - Automobile
Issued by:	MIIT
Issued on:	2023-4-21
Implemented on:	2023-11-1
Status:	valid
Superseding:	QC/T 268-1999 Extreme deviation for undeclared tolerance size of processing parts for automobile cold stamping
Language:	English
File Format:	PDF
Word Count:	9000 words
Price(USD):	270.0
Delivery:	via email in 1 business day

QC/T 268-2023 Permissible automobile cold stamping variations in dimensions without tolerance indication 1 Scope This document specifies the permissible variations in dimensions without tolerance indication for the features of size formed after cold stamping processing in the automobile part drawing. This document is applicable to the permissible variations in dimensions without tolerance indication after cold stamping processing in the automobile part drawing. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 15055 Permissible stamping variations in dimensions without tolerance indication 3 Terms and definitions For the purpose of this document, the terms and definitions given in GB/T 15055 apply. 4 Permissible variations in dimensions without tolerance indication for flat stamping processing 4.1 Permissible variations in dimensions without tolerance indication of the blanking length L and diameter D/d for flat stamping 4.1.1 The blanking length L, diameter D/d and blanking arc radius R for flat stamping are shown in Figure 1. Figure 1 4.1.2 The permissible variations in dimensions without tolerance indication of the blanking length L and diameter D/d for flat stamping shall be in accordance with those specified in Table 1. Table 1 Dimensions in millimeters

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Permissible variations in dimensions without tolerance indication for flat stamping processing 5 Dimension tolerance of formed bending parts 6 Permissible variations in dimensions without tolerance indication for formed drawing 7 Permissible variations in dimensions without tolerance indication of hole margin, hole center distance and hole group distance of stamping parts 8 Adoption of the presentation of this document