QC/T 268-2023 English PDF
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QC/T 268: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| QC/T 268-2023 | 275 | Add to Cart | Auto, 9 seconds. | Permissible automobile cold stamping variations in dimensions without tolerance indication | Valid |
| QC/T 268-1999 | 130 | Add to Cart | Auto, 9 seconds. | Extreme deviation for undeclared tolerance size of processing parts for automobile cold stamping | Obsolete |
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QC/T 268-2023: Permissible automobile cold stamping variations in dimensions without tolerance indication
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QC AUTOMOBILE INDUSTRY STANDARD ICS 43.040 CCS T 33 Replacing QC/T 268-1999 Permissible automobile cold stamping variations in dimensions without tolerance indication Issued on. APRIL 21, 2023 Implemented on. NOVEMBER 01, 2023 Issued by. Ministry of Industry and Information Technology of the PRC
Table of Contents
Foreword... 6 1 Scope... 8 2 Normative references... 8 3 Terms and definitions... 8 4 Limit deviations of dimensions without tolerance indications for flat stamping... 8 5 Dimensional tolerance of formed bent parts... 11 6 Limit deviation of forming and drawing without tolerance indications... 13 7 Limit deviations of hole edge distance, hole center distance, hole group distance of stamped parts without tolerance indications... 15 8 The method of expression in this document... 18 Announcement of Ministry of Industry and Information Technology of the People's Republic of China No.7, 2023Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document replaces QC/T 268-1999 "Extreme deviation for undeclared tolerance size of processing parts for automobile cold stamping". Compared with QC/T 268-1999, in addition to structural adjustments and editorial modifications, the main technical changes are as follows. a) ADD normative references (see Chapter 2); b) DELETE the terms and definitions of "punching dimensions", directly quoting the terms and definitions defined in GB/T 15055 (see Chapter 3; Chapter 2 of the 1999 edition); c) DELETE the limit deviation provisions of holes and shafts without dimension indications in Table 1; CHANGE "basic dimensions" to "nominal dimensions", adding the tolerance grading (see 4.1; Table 1 of the 1999 edition); d) CHANGE the "punching angle without tolerance indication" to "punching angle without tolerance indication" (see 4.2; 3.4 of the 1999 edition); e) CHANGE some values of the angle limit deviation in Table 3 (see 4.2.2; Table 3 of the 1999 edition); f) CHANGE the "bending angle without tolerance indication" to "bending angle without tolerance dimension indication" (see 5.2; 4.3 of the 1999 edition); g) CHANGE the key "angle short side length mm" in Table 6 to "angle short side length L/mm" (see 5.2.2; Table 6 of the 1999 edition); h) ADD the grading for the limit deviation of the hole spacing without tolerance indications affected by warpage (see 7.4.2); i) CHANGE "T minimum" to "Tmin"; CHANGE "T nominal" to "T" (see 6.5; 5.5 of the 1999 edition). Please note that some contents of this document may involve patents. The issuing agency of this document does not assume the responsibility of identifying patents. This document was proposed by AND shall be under the jurisdiction of the National Automobile Standardization Technical Committee (SAC/TC 114). Drafting organizations of this document. Dongfeng Motor Group Co., Ltd., Pan Asia Automotive Technology Center Co., Ltd., Beijing Automotive Off-road Vehicle Research Institute Co., Ltd. The main drafters of this document. Ma Yongbin, Wang Ke, Long Conglin, Li Yan, Wang Lixin, Zhu Yan, Zhou Xiaozhen, Cai Haohua, Chen Zhongchun, Xu Hongwen, Zhang Xuewen, Cui Wei, Sun Xiaoming, Chen Pu. This standard replaces the standard previously issued as follows. - It was first published in 1989 as ZB/T 04006.3-1989; - It was first revised in 1999 as QC/T 268-1999; - This is the second revision. Permissible automobile cold stamping variations in dimensions without tolerance indication1 Scope
This document specifies the permissible automobile cold stamping variations in dimensions without tolerance indication in the drawings of automotive product parts. This document is applicable to the permissible automobile cold stamping variations in dimensions without tolerance indication in the drawings of automotive product parts.2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. GB/T 15055 Permissible stamping variations in dimensions without tolerance indication3 Terms and definitions
The terms and definitions defined in GB/T 15055 apply to this document.4 Limit deviations of dimensions without tolerance
indications for flat stamping 4.1 Limit deviations of dimensions without tolerance indications for flat stamping punching length L and diameter D/d 4.1.1 See Figure 1 for the flat stamping punching length L, diameter D/d, punching arc radius R. Figure 1 4.1.4 When the value of the internal and external corner radius r (see Figure 1) formed by the two punching edges is not indicated on the drawing, r shall not be greater than 70% of the nominal material thickness. 4.2 Limit deviation of dimension without tolerance indication of punching angle5 Dimensional tolerance of formed bent parts
5.1 Limit deviation of dimension bending length L and curling diameter d without tolerance 5.1.1 Bending length L and curling diameter d are as shown in Figure 3. Figure 3 5.2 Limit deviation of bending angle without tolerance indication 5.2.1 See Figure 4 for bending angle. 5.2.2 Limit deviation of bending angle without tolerance indication shall be as specified in Table 6. Table 66 Limit deviation of forming and drawing without tolerance indications
6.1 Limit deviation of drawing diameter d without tolerance indication The limit deviation of drawing diameter d1 (Figure 1C)] without tolerance indication shall be enlarged by 1 grade, according to the "Basic dimension" column in Table 1. 6.3 The limit deviation of the height of the reinforcing rib and reinforcing dimple without tolerance indications 6.3.1 The height h of the reinforcing rib and reinforcing dimple is as shown in Figure 6. Figure 6 6.3.2 The limit deviation of the height h of the reinforcing rib and reinforcing dimple without tolerance indication shall be in accordance with Table 8 6.4 The limit deviation of the arc radius of the formed part without tolerance indication The limit deviation of the arc radius r of the formed part (see Figures 3, 5, 6) without tolerance indication shall be in accordance with Table 9.7 Limit deviations of hole edge distance, hole center distance, hole group distance of stamped parts without tolerance indications
7.1 Limit deviations of punching distance to edge of strip, flat strip and other profiles without tolerance indications 7.1.2 Limit deviations of punching distance to edge of strip, flat strip and other profiles without tolerance indications shall be specified in Table 10. 7.2 Limit deviation of center distance of holes connected to the same part without tolerance indication 7.3 Limit deviation of center distance of holes connected to different parts without tolerance indication 7.3.1 See Figure 9 for center distance of group holes connected to different parts. Figure 9 7.3.2 Limit deviation of center distance of holes connected to different parts without tolerance indication shall be specified in Table 12. 7.4 Limit deviation of hole spacing affected by warpage without tolerance indication8 The method of expression in this document
The limit deviation of the dimension without tolerance indication specified in this document shall be expressed by the document number and tolerance grade symbol in the corresponding drawings, technical documents or standards. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
