塑料件尺寸公差

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，亦可參照米用。2. 引用標(biāo)準(zhǔn)公差與配合總論標(biāo)準(zhǔn)公差與基本偏差 光滑工件尺寸的檢驗機(jī)械制圖尺寸公差與配合注法下列標(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。GB1800-79GB3177-82GJB4458.5-843. 定義3.1基本尺寸bas

2、ic size設(shè)計給定的尺寸。3.2 實際尺寸actral size通過測量所得的尺寸。3.3 尺寸公差dime nsional tolera nee允許尺寸的變動量。3.4 尺寸偏差dime nsional deviati on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 chara

3、rcteristic 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。 尺寸公差、偏關(guān)的規(guī)定基本尺寸范圍為3至600mm。基本尺寸分段3至120mm。采用不均勻遞 增數(shù)列：1401600mm,采用R20優(yōu)先數(shù)系。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。表1基本尺 寸公差等級1234 151678910公差數(shù)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：表中公差值用于基準(zhǔn)孔或非基準(zhǔn)孔時取（+）號；用于基準(zhǔn)軸或非配合 軸?。?）值，用于非配合長度取半值冠以正負(fù)（士）號4. 3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：60+0-30mm，O 60 0 mm， 60+020mm， 60+042mm，O 60+016mm4. 4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

9、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： & 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。相應(yīng)的公差等級料收縮特性值代號名稱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%玻璃纖維增強(qiáng)塑料高沖擊強(qiáng)度聚苯乙烯氨基塑料122334PVCPE POMPPPEPVC聚對苯酸丁二酯聚碳酸酯聚對苯酸丁二酯

10、酚醛塑料聚甲基丙烯酸甲酯聚苯硫醚（增強(qiáng)）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（軟）10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米用。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，或由試驗結(jié)果定。66.6.測量方法1公差測量條件a. 標(biāo)準(zhǔn)測量溫度為20士2C；b. 相對濕度為（65士 5） %C.待塑料件成型后24h及“后處理”后進(jìn)行測量。2公差的測量方法

11、公差的測量方法和量具，按 GB3177的規(guī)定。 公差的注法公差的注法，按GB4458.5的規(guī)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