塑料件尺寸公差及性能

1、塑料件尺寸公差1 范圍本標(biāo)準(zhǔn)規(guī)定了注射、壓制、擠塑等成型的熱塑性和熱固性塑料（不包括二次加工和發(fā)泡成型的塑料件）尺寸公差、偏差、公差等級的選用、測量條件和測量方法。本標(biāo)準(zhǔn)主要適用于電子產(chǎn)品用塑料件尺寸公差，其他產(chǎn)品用塑料件尺寸公差，亦可參照采用。2 引用標(biāo)準(zhǔn)下列標(biāo)準(zhǔn)所包含的條文，通過在標(biāo)準(zhǔn)中引用而構(gòu)成本標(biāo)準(zhǔn)的條文。在標(biāo)準(zhǔn)出版時，所示版本均為有效。所有標(biāo)準(zhǔn)都會被修訂，使用標(biāo)準(zhǔn)的各方應(yīng)探討使用下列標(biāo)準(zhǔn)最新版本的可能性。GB1800-79 公差與配合 總論 標(biāo)準(zhǔn)公差與基本偏差GB3177-82 光滑工件尺寸的檢驗(yàn)GJB4458.5-84 機(jī)械制圖 尺寸公差與配合注法3 定義3.1基本尺寸 basic

2、 size設(shè)計(jì)給定的尺寸。3.2實(shí)際尺寸 actral size通過測量所得的尺寸。3.3尺寸公差 dimensional tolerance允許尺寸的變動量。3.4尺寸偏差 dimensional deviation某一尺寸減去基本尺寸所得的代數(shù)差。3.5塑料收縮率 plastic shringkage塑料件尺寸與相應(yīng)模具尺寸之差的絕對值與相應(yīng)模具尺寸之比。3.6徑向收縮率 radial shringkage指料流方向的塑料收縮率。3.7切向收縮率 tangential shringkage指垂直于料流方向的塑料收縮率。3.8收縮特性值 contraction chararcteristic

3、 value表示料流方向和垂直于料流方向的塑料綜合收縮能力，以2倍徑向減去切向收縮的絕對值之差表示。3.9受模具活動部分影響的尺寸 size effected movable parts of mould由模具活動零件決定的塑料件尺寸。4 公差及偏差規(guī)定4.1尺寸公差、偏關(guān)的規(guī)定基本尺寸范圍為3至600mm?；境叽绶侄?至120mm。采用不均勻遞增數(shù)列：1401600mm，采用R20優(yōu)先數(shù)系。4.2公差等級及數(shù)值公差等級分為10級，每一級公差數(shù)值按表1規(guī)定。43 偏差的規(guī)定本標(biāo)準(zhǔn)只規(guī)定公差，而基本尺寸的上下偏差，可按需要分配。例如：60mm的6級公差為0.32mm，其上下偏差可分配為：60m

4、m，60mm，60mm，60mm，60mm44 受模具活動部分影響的尺寸公差 受模具活動部分影響的尺寸公差，為本標(biāo)準(zhǔn)規(guī)定的公差值與附加值之和。1、2級附加值為0.02mm：3、4級附加值為0.04mm：5至7級附加值為0.1mm：8、10級附加值為0.2mm：5 未注公差尺寸未注公差，按表1規(guī)定的710級公差選用。公差等級的選用公差等級的選用，按表2規(guī)定。表1基本尺寸公差等級12345678910公差數(shù)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：表中公差值用于基準(zhǔn)孔或非基準(zhǔn)孔時?。?）號；用于基準(zhǔn)軸或非配合軸取（-）值，用于非配合長度取半值冠以正負(fù)（±）號材料相應(yīng)的公差等級收縮特性值代號名稱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%玻璃纖維增強(qiáng)塑料HIPS高沖擊強(qiáng)度聚苯乙烯MF氨基塑料PBTP聚對苯酸丁二酯PC聚碳酸酯PETP聚對苯酸丁二酯PF酚醛塑料PMMA聚甲基丙烯酸甲酯PPE聚苯硫醚（增強(qiáng)）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（軟）注 ：1、其他材料，可按加工尺寸的穩(wěn)定性，參照表2選取公差等級。2、1、2級為精密級，只有在特殊條件下才采用。3、當(dāng)沿脫模方向兩端尺寸均在要求時，應(yīng)考慮脫模斜度對公差的影響。4、其他增強(qiáng)塑料的收縮特性性值，應(yīng)比表2 中規(guī)定的小，或由試驗(yàn)結(jié)果定。6 測量方法 61 公差測量條件a. 標(biāo)準(zhǔn)測量溫度為20±2；b. 相對濕度為（65±5）%；c. 待塑料件成型后24h及“后處

11、理”后進(jìn)行測量。62 公差的測量方法 公差的測量方法和量具，按GB3177的規(guī)定。7 公差的注法公差的注法，按GB4458.5的規(guī)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：價格低、產(chǎn)量大、用途廣；酚醛塑料PF，氨基塑料，PVC，PE，PS，PP工程塑料：力學(xué)性能、耐磨性、耐腐蝕性、尺寸穩(wěn)定性、有一定的金屬特性；PA、PC、POM、ABS、PSF、聚苯醚、聚氯醚增強(qiáng)塑料：玻璃纖維等增強(qiáng)材料，提高了力學(xué)性能，如抗拉強(qiáng)度、抗彎強(qiáng)度、疲勞強(qiáng)