塑料件尺寸公差

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，亦可参照米用。2. 引用标准公差与配合总论标准公差与基本偏差 光滑工件尺寸的检验机械制图尺寸公差与配合注法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。GB1800-79GB3177-82GJB4458.5-843. 定义3.1基本尺寸bas

2、ic 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dime nsional tolera nee允许尺寸的变动量。3.4 尺寸偏差dime nsional deviati on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 chara

3、rcteristic 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。 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。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。表1基本尺 寸公差等级1234 151678910公差数值30.020.030.040.060.040.320.483

4、60.030.040.050.070.080.360.566100.030.040.060.000.320.400.6410140.030.050.060.020.360.440.7214180.040.050.000.240.400.480.8018240.040.060.020.280.440.560.8824300.050.060.040.320.480.640.9630400.050.080.260.360.520.72

5、1.040500.060.000.280400.560.801.250650.060.020.320.460.640.921.465800.090.260.380.520.761.01.6801000.020.300.440.600.881.21.81200.050.340.500.681.01.412.014000.280.380.560.716020.310.420.620.81800.1

6、40.460.680.920060.370.500.741.01.52.03.0280.410.560.83.325000.450.620.903.62800.180.260.340.500.681.01.32.02.64.03150.200.280.380.550.72.84.43550.220.300.420.600.83.24.84000.240.340.460.650.903.6

7、5.24500.260.380.520.701.01.42.02.84.05.65000.300.420.600.805600.340.460.640.86300.380.520.720.991.32.07.97100.420.600.803.04.46.08.88000.460.640.909.89000.520.721.010.810000.600.88.512.81200

8、0.761.03.557101414000.83.04.068111616001.03.55.0791318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（士）号4. 3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：60+0-30mm，O 60 0 mm， 60+020mm， 60+042mm，O 60+016mm4. 4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

9、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： & 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。相应的公差等级料收缩特性值代号名称高精度一般精度低精度01ABS AS_ GRD HIPS MF PBTP PC PETP PF PMMA PPE PPO PPS PS PSU PA苯乙烯-丁二烯-丙烯腈共聚物 丙烯腈-苯乙烯共聚物30%玻璃纤维增强塑料高冲击强度聚苯乙烯氨基塑料122334PVCPE POMPPPEPVC聚对苯酸丁二酯聚碳酸酯聚对苯酸丁二酯

10、酚醛塑料聚甲基丙烯酸甲酯聚苯硫醚（增强）聚苯醚聚苯醚砜 _-聚苯乙烯聚砜聚酰胺6、66、610、9、1而 氯化聚醚-聚氯乙烯（硬）聚乙烯（高密度）聚甲醛聚丙烯聚乙烯（低密度）-聚氯乙烯（软）10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米用。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。66.6.测量方法1公差测量条件a. 标准测量温度为20士2C；b. 相对湿度为（65士 5） %C.待塑料件成型后24h及“后处理”后进行测量。2公差的测量方法

11、公差的测量方法和量具，按 GB3177的规定。 公差的注法公差的注法，按GB4458.5的规定。4.5.CommercialTOLERANCE (mm)Up to 10.050.07Over 1up to and inc30.060.08Over 3up to and inc60.070.09Over 6up to and inc100.080.09Over 10up to and inc150.080.11Over 15up to and inc220.090.13Over 22up to and inc300.110.14Over 30up to and inc400.130.17Over

12、 40up to and inc550.140.20Over 55up to and inc700.170.24Over 70up to and inc900.200.29Over 90up to and inc1200.250.35Over 120up to and inc1600.300.43Over 160up to and inc2000.360.51Over 200up to and inc2500.440.68Over 250up to and inc3150.550.85Over 315up to and inc4000.701.08Over 400up to and inc50

13、00.901.38Over 500up to and inc6501.201.83Over 650up to and inc8001.502.28Over 800up to and inc10001.902.90Over 1000up to and inc12002.303.50Over 1200up to and inc14002.654.05Over 1400up to and inc16003.054.65Over 1600up to and inc18003.405.20Over 1800up to and inc20003.805.)Fi neNOMINAL DIMENSIONS (

14、mm)TABLE 1 : DIMENSIONAL TOLERANCES - GROUP 1 MATERIALSTABLE 2 : DIMENSIONAL TOLERANCES - GROUP 2 MATERIALSNOMINAL DIMENSIONS (mm)TOLERANCE (mm)Fi neCommercialUp to 10.060.08Over 1up to and inc30.070.09Over 3up to and inc60.080.10Over 6up to and inc100.080.12Over 10up to and inc150.100.14Over 15up t

15、o and inc220.110.17Over 22up to and inc300.130.20Over 30up to and inc400.150.23Over 40up to and inc550.180.27Over 55up to and inc700.210.33Over 70up to and inc900.260.41Over 90up to and inc1200.310.50Over 120up to and inc1600.380.62Over 160up to and inc2000.450.79Over 200up to and inc2500.600.95Over

16、 250up to and inc3150.751.20Over 315up to and inc4000.981.63Over 400up to and inc5001.282.13Over 500up to and inc6501.732.88Over 650up to and inc8002.183.63Over 800up to and inc10002.804.63Over 1000up to and inc12003.355.55Over 1200up to and inc14003.906.50Over 1400up to and inc16004.507.40Over 1600

17、up to and inc18005.058.30Over 1800up to and inc20005.609.25TABLE 3 : DIMENSIONAL TOLERANCES - GROUP 3 MATERIALSNOMINAL DIMENSIONS (mm)TOLERANCE (mm)Fi neCommercialUp to 10.070.10Over 1up to and inc30.080.11Over 3up to and inc60.080.12Over 6up to and inc100.100.14Over 10up to and inc150.120.17Over 15

18、up to and inc220.140.20Over 22up to and inc300.170.24Over 30up to and inc400.190.28Over 40up to and inc550.230.34Over 55up to and inc700.280.41Over 70up to and inc900.340.51Over 90up to and inc1200.410.62Over 120up to and inc1600.520.79Over 160up to and inc2000.651.00Over 200up to and inc2500.801.20

19、Over 250up to and inc3151.001.50Over 315up to and inc4001.352.05Over 400up to and inc5001.752.65Over 500up to and inc6502.353.55Over 650up to and inc8002.954.45Over 800up to and inc10003.755.65Over 1000up to and inc12004.506.80Over 1200up to and inc14005.257.90Over 1400up to and inc16006.009.05Over

20、1600up to and inc18006.7510.15Over 1800up to and inc20007.5011.30MOULD SHRINKAGE AND COEFFICIENTS OF LINEAR EXPANSIONiviouldShrinkageper cent106 coeTT linearexpansion k -11ABS0.4 -0.8501101ABS - 30% glass filled0.1 -0.33550Acetal1.5 -2.590150Acetal - 30% glass filled0.5 -1.53580Acrylic0.2 -0.85090Ce

21、llulose Acetate0.3 -0.880160Cellulose Acetate Butyrate0.2 -0.7110170Diallyl P hthalate0.2 -0.91060Ethylene Vinyl Acetate0.7 -1.2230250Melamine Formaldehyde0.6 -0.81050Nylon 60.6 -2.570170Nylon 6-30% glass filled0.2 -1.21530Nylon 660.7 -2.560110Nylon 66 - 30% glass filled0.2 -1.21530Nylon 110.9 -2.09

22、0150Nylon 11 - 30% glass filled0.3 -0.71040Nylon 120.3 -2.090130Nylon 12 - 30% glass filled0.5 -1.53070P henol Formaldehyde0.2 -1.51530Po lycarbonate0.5 -0.82070Po lycarbonate - 30% glass filled0.2 -0.62030P olycarbonate / ABS (Bayblend)0.4 -0.77085Po lyester, laminates0.1 -1.21050Po lyester, therm

23、opl asticPo lybutylene Tere phthalate1.2 -2.380180Po lybutylene Tere phthalate-30% glass filled0.2 -1.53060Po lyethylene Tere phthalate1.3 -1.670150Po lyethylene Tere phthalate-30% glass filled0.2 -2.02040Po lyester, therm opl astic elastomer0.3 -1.4140210Po lyethylene, low density1.0 -4.4200250Po lyethylene, high density1.5 -3.3150200P olyethylene Oxide-mod-(Noryl)0.5 -0.76070P olyethylene Oxide-mod-30%-glass filled0.1 -0.32030Polypropy lene1