塑料件尺寸公差及性能

1、塑料件尺寸公差1 范围本标准规定了注射、压制、挤塑等成型的热塑性和热固性塑料（不包括二次加工和发泡成型的塑料件）尺寸公差、偏差、公差等级的选用、测量条件和测量方法。本标准主要适用于电子产品用塑料件尺寸公差，其他产品用塑料件尺寸公差，亦可参照采用。2 引用标准下列标准所包含的条文，通过在标准中引用而构成本标准的条文。在标准出版时，所示版本均为有效。所有标准都会被修订，使用标准的各方应探讨使用下列标准最新版本的可能性。GB1800-79 公差与配合 总论 标准公差与基本偏差GB3177-82 光滑工件尺寸的检验GJB4458.5-84 机械制图 尺寸公差与配合注法3 定义3.1基本尺寸 basic

2、 size设计给定的尺寸。3.2实际尺寸 actral size通过测量所得的尺寸。3.3尺寸公差 dimensional tolerance允许尺寸的变动量。3.4尺寸偏差 dimensional deviation某一尺寸减去基本尺寸所得的代数差。3.5塑料收缩率 plastic shringkage塑料件尺寸与相应模具尺寸之差的绝对值与相应模具尺寸之比。3.6径向收缩率 radial shringkage指料流方向的塑料收缩率。3.7切向收缩率 tangential shringkage指垂直于料流方向的塑料收缩率。3.8收缩特性值 contraction chararcteristic

3、 value表示料流方向和垂直于料流方向的塑料综合收缩能力，以2倍径向减去切向收缩的绝对值之差表示。3.9受模具活动部分影响的尺寸 size effected movable parts of mould由模具活动零件决定的塑料件尺寸。4 公差及偏差规定4.1尺寸公差、偏关的规定基本尺寸范围为3至600mm。基本尺寸分段3至120mm。采用不均匀递增数列：1401600mm，采用R20优先数系。4.2公差等级及数值公差等级分为10级，每一级公差数值按表1规定。43 偏差的规定本标准只规定公差，而基本尺寸的上下偏差，可按需要分配。例如：60mm的6级公差为0.32mm，其上下偏差可分配为：60m

4、m，60mm，60mm，60mm，60mm44 受模具活动部分影响的尺寸公差 受模具活动部分影响的尺寸公差，为本标准规定的公差值与附加值之和。1、2级附加值为0.02mm：3、4级附加值为0.04mm：5至7级附加值为0.1mm：8、10级附加值为0.2mm：5 未注公差尺寸未注公差，按表1规定的710级公差选用。公差等级的选用公差等级的选用，按表2规定。表1基本尺寸公差等级12345678910公差数值30.020.030.040.060.080.120.160.240.320.48>360.030.040.050.070.080.140.180.280.360.56>6100.

5、030.040.060.080.100.160.200.320.400.64>10140.030.050.060.090.120.180.220.360.440.72>14180.040.050.070.100.120.200.240.400.480.80>18240.040.060.080.110.140.220.280.440.560.88>24300.050.060.090.120.160.240.320.480.640.96>30400.050.070.100.130.180.260.360.520.721.0>40500.060.080.110.1

6、40.200.280400.560.801.2>50650.060.090.120.160.220.320.460.640.921.4>65800.070.100.140.190.260.380.520.761.01.6>801000.080.120.160.220.300.440.600.881.21.81200.090.130.180.250.340.500.681.01.412.01400.100.150.200.280.380.560.761.11.52.21600.120.160.220.310.420.620.841.21.82.41800.130.180.240

7、.340.460.680.921.41.82.72000.140.200.260.370.500.741.01.52.03.02250.150.220.280.410.560.821.11.62.23.32500.160.240.300.450.620.901.21.82.43.62800.180.260.340.500.681.01.32.02.64.03150.200.280.380.550.741.11.42.22.84.43550.220.300.420.600.821.21.62.43.24.84000.240.340.460.650.901.31.82.63.65.24500.26

8、0.380.520.701.01.42.02.84.05.65000.300.420.600.801.11.62.23.24.46.45600.340.460.640.881.21.82.43.64.87.16300.380.520.720.991.32.02.73.95.47.97100.420.600.801.11.52.23.04.46.08.88000.460.640.901.21.72.53.34.96.79.89000.520.721.01.41.92.83.85.57.510.810000.600.821.21.62.23.24.36.08.512.812000.761.01.4

9、1.82.53.557101414000.881.21.62.53.04.068111616001.01.41.83.03.55.0791318注：表中公差值用于基准孔或非基准孔时取（+）号；用于基准轴或非配合轴取（-）值，用于非配合长度取半值冠以正负（±）号材料相应的公差等级收缩特性值代号名称高精度一般精度低精度01ABS苯乙烯-丁二烯-丙烯腈共聚物345AS丙烯腈-苯乙烯共聚物GRD 30%玻璃纤维增强塑料HIPS高冲击强度聚苯乙烯MF氨基塑料PBTP聚对苯酸丁二酯PC聚碳酸酯PETP聚对苯酸丁二酯PF酚醛塑料PMMA聚甲基丙烯酸甲酯PPE聚苯硫醚（增强）PPO聚苯醚PPS聚苯醚

10、砜PS聚苯乙烯PSU聚砜12PA聚酰胺6、66、610、9、1010456氯化聚醚PVC聚氯乙烯（硬）23PE聚乙烯（高密度）678POM聚甲醛PP 聚丙烯34PE聚乙烯（低密度）8910PVC聚氯乙烯（软）注 ：1、其他材料，可按加工尺寸的稳定性，参照表2选取公差等级。2、1、2级为精密级，只有在特殊条件下才采用。3、当沿脱模方向两端尺寸均在要求时，应考虑脱模斜度对公差的影响。4、其他增强塑料的收缩特性性值，应比表2 中规定的小，或由试验结果定。6 测量方法 61 公差测量条件a. 标准测量温度为20±2；b. 相对湿度为（65±5）%；c. 待塑料件成型后24h及“后处

11、理”后进行测量。62 公差的测量方法 公差的测量方法和量具，按GB3177的规定。7 公差的注法公差的注法，按GB4458.5的规定。TABLE 1 : DIMENSIONAL TOLERANCES - GROUP 1 MATERIALSNOMINAL DIMENSIONS (mm) TOLERANCES ± (mm) Fine Commercial Up to 1 0.05 0.07 Over 1 up to and inc 3 0.06 0.08 Over 3 up to and inc 6 0.07 0.09 Over 6 up to and inc 10 0.08 0.09

12、Over 10 up to and inc 15 0.08 0.11 Over 15 up to and inc 22 0.09 0.13 Over 22 up to and inc 30 0.11 0.14 Over 30 up to and inc 40 0.13 0.17 Over 40 up to and inc 55 0.14 0.20 Over 55 up to and inc 70 0.17 0.24 Over 70 up to and inc 90 0.20 0.29 Over 90 up to and inc 120 0.25 0.35 Over 120 up to and

13、inc 160 0.30 0.43 Over 160 up to and inc 200 0.36 0.51 Over 200 up to and inc 250 0.44 0.68 Over 250 up to and inc 315 0.55 0.85 Over 315 up to and inc 400 0.70 1.08 Over 400 up to and inc 500 0.90 1.38 Over 500 up to and inc 650 1.20 1.83 Over 650 up to and inc 800 1.50 2.28 Over 800 up to and inc

14、1000 1.90 2.90 Over 1000 up to and inc 1200 2.30 3.50 Over 1200 up to and inc 1400 2.65 4.05 Over 1400 up to and inc 1600 3.05 4.65 Over 1600 up to and inc 1800 3.40 5.20 Over 1800 up to and inc 2000 3.80 5.80 TABLE 2 : DIMENSIONAL TOLERANCES - GROUP 2 MATERIALSNOMINAL DIMENSIONS (mm) TOLERANCES

15、77; (mm) Fine Commercial Up to 1 0.06 0.08 Over 1 up to and inc 3 0.07 0.09 Over 3 up to and inc 6 0.08 0.10 Over 6 up to and inc 10 0.08 0.12 Over 10 up to and inc 15 0.10 0.14 Over 15 up to and inc 22 0.11 0.17 Over 22 up to and inc 30 0.13 0.20 Over 30 up to and inc 40 0.15 0.23 Over 40 up to and

16、 inc 55 0.18 0.27 Over 55 up to and inc 70 0.21 0.33 Over 70 up to and inc 90 0.26 0.41 Over 90 up to and inc 120 0.31 0.50 Over 120 up to and inc 160 0.38 0.62 Over 160 up to and inc 200 0.45 0.79 Over 200 up to and inc 250 0.60 0.95 Over 250 up to and inc 315 0.75 1.20 Over 315 up to and inc 400 0

17、.98 1.63 Over 400 up to and inc 500 1.28 2.13 Over 500 up to and inc 650 1.73 2.88 Over 650 up to and inc 800 2.18 3.63 Over 800 up to and inc 1000 2.80 4.63 Over 1000 up to and inc 1200 3.35 5.55 Over 1200 up to and inc 1400 3.90 6.50 Over 1400 up to and inc 1600 4.50 7.40 Over 1600 up to and inc 1

18、800 5.05 8.30 Over 1800 up to and inc 2000 5.60 9.25 TABLE 3 : DIMENSIONAL TOLERANCES - GROUP 3 MATERIALSNOMINAL DIMENSIONS (mm) TOLERANCES ± (mm) Fine Commercial Up to 1 0.07 0.10 Over 1 up to and inc 3 0.08 0.11 Over 3 up to and inc 6 0.08 0.12 Over 6 up to and inc 10 0.10 0.14 Over 10 up to

19、and inc 15 0.12 0.17 Over 15 up to and inc 22 0.14 0.20 Over 22 up to and inc 30 0.17 0.24 Over 30 up to and inc 40 0.19 0.28 Over 40 up to and inc 55 0.23 0.34 Over 55 up to and inc 70 0.28 0.41 Over 70 up to and inc 90 0.34 0.51 Over 90 up to and inc 120 0.41 0.62 Over 120 up to and inc 160 0.52 0

20、.79 Over 160 up to and inc 200 0.65 1.00 Over 200 up to and inc 250 0.80 1.20 Over 250 up to and inc 315 1.00 1.50 Over 315 up to and inc 400 1.35 2.05 Over 400 up to and inc 500 1.75 2.65 Over 500 up to and inc 650 2.35 3.55 Over 650 up to and inc 800 2.95 4.45 Over 800 up to and inc 1000 3.75 5.65

21、 Over 1000 up to and inc 1200 4.50 6.80 Over 1200 up to and inc 1400 5.25 7.90 Over 1400 up to and inc 1600 6.00 9.05 Over 1600 up to and inc 1800 6.75 10.15 Over 1800 up to and inc 2000 7.50 11.30 MOULD SHRINKAGE AND COEFFICIENTS OF LINEAR EXPANSIONMATERIAL Mould Shrinkage per centCoeff . linear ex

22、pansion10-6 /°C-1 ABS 0.4 -0.8 50 -110 ABS - 30% glass filled 0.1 -0.3 35 -50 Acetal 1.5 -2.5 90 -150 Acetal - 30% glass filled 0.5 -1.5 35 -80 Acrylic 0.2 -0.8 50 -90 Cellulose Acetate 0.3 -0.8 80 -160 Cellulose Acetate Butyrate 0.2 -0.7 110 -170 Diallyl Phthalate 0.2 -0.9 10 -60 Ethylene Viny

23、l Acetate 0.7 -1.2 230 -250 Melamine Formaldehyde 0.6 -0.8 10 -50 Nylon 6 0.6 -2.5 70 -170 Nylon 6-30% glass filled 0.2 -1.2 15 -30 Nylon 66 0.7 -2.5 60 -110 Nylon 66 - 30% glass filled 0.2 -1.2 15 -30 Nylon 11 0.9 -2.0 90 -150 Nylon 11 - 30% glass filled 0.3 -0.7 10 -40 Nylon 12 0.3 -2.0 90 -130 Ny

24、lon 12 - 30% glass filled 0.5 -1.5 30 -70 Phenol Formaldehyde 0.2 -1.5 15 -30 Polycarbonate 0.5 -0.8 20 -70 Polycarbonate - 30% glass filled 0.2 -0.6 20 -30 Polycarbonate / ABS (Bayblend) 0.4 -0.7 70 -85 Polyester, laminates 0.1 -1.2 10 -50 Polyester, thermoplastic Polybutylene Terephthalate 1.2 -2.

25、3 80 -180 Polybutylene Terephthalate - 30% glass filled 0.2 -1.5 30 -60 Polyethylene Terephthalate 1.3 -1.6 70 -150 Polyethylene Terephthalate - 30% glass filled 0.2 -2.0 20 -40 Polyester, thermoplastic elastomer 0.3 -1.4 140 -210 Polyethylene, low density 1.0 -4.4 200 -250 Polyethylene, high densit

26、y 1.5 -3.3 150 -200 Polyethylene Oxide-mod-(Noryl) 0.5 -0.7 60 -70 Polyethylene Oxide-mod-30% - glass filled 0.1 -0.3 20 -30 Polypropylene 1.3 -2.5 110 -170 Polypropylene - 20% talc filled 0.8 -1.8 70 -110 Polypropylene - 20% glass filled 0.7 -2.0 60 -140 Polypropylene - asbestos filled 0.4 -1.2 20

27、-40 Polypropylene - rubber modified 0.8 -2.0 50 -140 Polystyrene 0.2 -0.8 35 -100 Polyurethane thermoplastic greater than 50 Shore D0.8 - 1.8130 - 120 equal or less than 50 Shore D 1.0 - 2.0150 - 225Polyurethane, RIM1.2 - 1.890 - 150 Polyurethane, RRIM0.3 - 0.630 - 180 Polyvinyl Chloride - rigid 0.2

28、 - 5.050 100Polyvinyl Chloride - flexible 0.7 - 5.0 70 - 250Styrene Acrylonitrile 0.2 - 0.650 - 110Urea Formaldehyde 0.6 - 1.430 - 50Note : The mould shrinkage and coefficient of expansion of fibre filled materials will vary in directions parallel and perpendicular to the flow.常 用 材 料 性 能通用塑料：价格低、产量大、用途广；酚醛塑料PF，氨基塑料，PVC，PE，PS，PP工程塑料：力学性能、耐磨性、耐腐蚀性、尺寸稳定性、有一定的金属特性；PA、PC、POM、ABS、PSF、聚苯醚、聚氯醚增强塑料：玻璃纤维等增强材料，提高了力学性能，如抗拉强度、抗弯强度、疲劳强