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GB/T 14486-2008: Dimensional tolerances for moulded plastic parts (English PDF)

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GB/T 14486-2008: Dimensional tolerances for moulded plastic parts
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GB/T 14486: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 14486-2008English265 Add to Cart 0-9 seconds. Auto-delivery Dimensional tolerances for moulded plastic parts Obsolete
GB/T 14486-1993English399 Add to Cart 3 days Dimensional tolerances for plastic engineering moulded plastic parts Obsolete

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GB/T 14486 | GB/T 16288 | GB/T 12598 | GB/T 14484 | 

GB/T 14486-2008: Dimensional tolerances for moulded plastic parts

GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.080; 83.080.01 G 31 Replacing GB/T 14486-1993 Dimensional tolerances for moulded plastic parts Issued on: AUGUST 14, 2008 Implemented on: APRIL 1, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword... 3 Introduction... 5 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 7 4 Basic provisions... 8 5 Inspection methods... 13 6 Indication of the dimensional tolerances... 14 Appendix A (Normative) Selection method for the tolerance grades of moulded plastic parts... 15

Foreword

The consistent degree between this Standard and DIN 16901.1982 (German national standard) Plastics mouldings – Tolerances and acceptance conditions for linear dimensions is not equivalent. The major differences are as follows. a) The basic dimension segments are different. The basic dimension segments in this Standard are the same with those in the ISO 286-1.1988.28 dimension segments are divided within the range of 0mm to 1,000mm, while there are only 21 dimension segments in the German standard. b) There are differences in the relationship between tolerance values and dimension values. Under the corresponding grade of precision, the tolerance values in these two standards are approximate within the small dimension range of 0mm to 100mm. Several tolerance values in the German standard are a little less than those in this Standard. However, within the large dimension range, the situation is just the opposite – the tolerance values in this Standard are less than those in the German standard. In terms of precision, the grade of precision in this Standard is about half a grade higher than that in the German standard. This Standard replaces GB/T 14486-1993 Dimensional tolerances for plastic engineering moulded plastic parts. Compared with the GB/T 14486-1993, the major differences are as follows. a) RENAME this Standard FROM Dimensional tolerances for plastic engineering moulded plastic parts TO Dimensional tolerances for moulded plastic parts. b) The tolerance values in the original national standard GB/T 14486-1993 are generally less than those of the products with the same precision and dimensions in the German industry standard DIN 16901.However, there are also some opposite situations within the range of 0mm to 100mm. During the revision, it partially refers to the smaller tolerance values in the German industry standard, so as to adapt to the current situation and requirements that the precision of plastic parts has been increasingly improved. c) EXPAND the dimension range in the tolerance table from “0mm~500mm” to “0mm~1,000mm”. ADD the corresponding tolerance values. d) SUPPLEMENT and MODIFY the Table 2 “Selection of the Dimensional Tolerance Grade of the Moulded Plastic Parts Made from Commonly Used Materials”. The Appendix A in this Standard is normative. This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of the National Technical Committee for Standardization of Plastics. Drafting organizations of this Standard. Sichuan University, and Nanjing Julong Engineering Plastics Co., Ltd. Participating drafting organization of this Standard. 5th Plant for Plastic Compression of Changhong Electronic Industry Co., Ltd. Main drafters of this Standard. Shen Kaizhi, Wu Zhengyuan, Wu Fen, and Gao Xueqin. The previous version replaced by this Standard is. GB/T 14486-1993.

Introduction

Dimensional deviations inevitably occurring in the production process of moulded plastic parts may result from a number of causes. a) Materials. Uniformity of the moulding materials. b) Moulding process. 1) Changes in the conditions of the operation process; 2) Control precision error of the moulding equipment. c) Condition of the mould. 1) Manufacturing tolerances for the dimensions of the mould; 2) Wear on the mould; 3) Fitting position error among the movable parts of the mould; 4) Temperature fluctuations of the mould; 5) Elastic deformation of the mould under moulding pressure. The dimensional tolerances for moulded plastic parts are determined on the basis of the above considerations on the factors affecting the dimensions of plastic parts, and a large number of measurements derived from practical applications. Dimensional tolerances for moulded plastic parts

1 Scope

This Standard specifies the dimensional tolerances for the moulded plastic parts made from thermosetting and thermoplastic materials (hereinafter referred to as “moulded plastic parts”). This Standard is applicable to the moulded plastic parts produced by injection moulding, compression moulding, transfer moulding and cast moulding, and is not applicable to extrusions, blow-moulded parts, sintered parts and foamed mouldings.

2 Normative references

The provisions in the following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest versions apply to this Standard. GB/T 1800.2-2008 [Translator note. the standard number should be “GB/T 1800.2-2009”.] Geometrical product specifications (GPS) – Limits and fits – Part 2.Tables of standard tolerance grades and limit deviations for holes and shafts (ISO 286-2.1988, MOD) GB/T 1844.1-2008 Plastics – Symbols and abbreviated terms – Part 1. Basic polymers and their special characteristics (ISO 1043-1.2001, IDT) GB/T 2035-2008 Terms and definitions for plastics (ISO 472.1999, IDT) GB/T 2918-1998 Plastics – Standard atmospheres for conditioning and testing (idt ISO 291.1997) GB/T 17037.4-2003 Plastics – Injection moulding of test specimens of thermoplastic materials – Part 4.Determination of moulding shrinkage (ISO 294-4.2001, IDT)

3 Terms and definitions

The terms, definitions and symbols specified in the GB/T 2035-2008 and the following ones apply to this Standard. 3.1 Moulding shrinkage SM It refers to the ratio OF the difference between the dimensions of the moulding chamber Lm and those of the corresponding moulded plastic part Lp TO the dimensions of the moulding chamber Lm at (23 ± 2) °C, expressed as percentage. 3.2 Moulding shrinkage in flow direction SMp It refers to the moulding shrinkage along the material flow direction during moulding. 3.3 Moulding shrinkage in transverse direction SMn It refers to the moulding shrinkage perpendicular to the flow direction during moulding. 3.4 Difference of moulding shrinkage in flow and transverse directions △SM It refers to the difference of moulding shrinkage in flow and transverse directions during moulding.

4 Basic provisions

4.1 Code, grades and values of the dimensional tolerances for moulded plastic parts The code of the dimensional tolerances for moulded plastic parts is MT. There are 7 tolerance grades in total. For the tolerance values at different grades, SEE Table 1. 4.2 Selection of tolerance grades For the selection of the tolerance grades for the moulded plastic parts made from commonly used plastic materials, SEE Table 2.The selected tolerance grades for moulded plastic parts, which are not listed in Table 2, shall be determined according to the shrinkage property values. For the specific methods, SEE Appendix A. The material codes shall conform to the provisions specified in the GB/T 1844.1-2008. 4.3 Dimensions with tolerance indications For the tolerance grades of the dimensions with tolerance indications, SEE Table 2.The listed numerical values correspond to the tolerance grades in Table 1. This Standard only specifies tolerances. The upper and lower deviations of basic dimensions can be divided according to the actual engineering needs. For instance, the tolerance 0.8 can be divided into.,, ± 0.4, or, etc. 4.4 Dimensions without tolerance indications For the tolerance grades of the dimensions without tolerance indications, SEE Table 2.The listed numerical values correspond to the tolerance grades in Table 1. 4.5 Dimension a not affected by the movable parts of the mould The dimensions not affected by the movable parts of the mould in Table 1 refer to the dimensions moulded by the same mould part in the mould. For instance, the radial dimensions of the moulded parts with integral cavities. SEE Figure 1. Figure 1 Dimension a not affected by the movable parts of the mould 4.6 Dimension b affected by the movable parts of the mould The dimensions affected by the movable parts of the mould in Table 1 refer to the dimensions jointly moulded by two or more mould parts whose relative positions might change. For instance, wall thickness and bottom thickness dimensions, dimensions affected by shims or mould slides. SEE Figure 2. Figure 2 Dimension b affected by the movable parts of the mould

5 Inspection methods

INSPECT the moulded plastic parts after moulding. PLACE the moulded plastic parts for 24h under the conditions of standard temperature (23°C ± 2°C) and humidity (50% ± 5%) specified in the GB/T 2918-1998 OR after “post treatment”. Under the conditions of this temperature and humidity, USE a micrometer or a vernier caliper with the accuracy of not less than 0.02mm to measure according to the GB/T 17037.4-2003.For the ultra-small or large plastic parts, it is also allowed to use optical methods (such as projector, etc.) for measurement. CONDUCT random sampling to the same position on the plastic part for five times. TAKE the mean value. PROVIDE the inspection report with the drawings of the product.

6 Indication of the dimensional tolerances

The indication methods of the dimensional tolerances shall conform to the requirements specified in the GB/T 1800.2-2008.

Appendix A

(Normative) Selection method for the tolerance grades of moulded plastic parts SELECT the tolerance grades according to the shrinkage property values of moulding materials. SEE Table A.1. ......
Source: Translated/reviewed by www.ChineseStandard.net / Wayne Zheng et al.
GB/T 14486-2008 English PDF: Image 1GB/T 14486-2008 English PDF: Image 2GB/T 14486-2008 English PDF: Image 3

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