《塑料件尺寸公差25652.pdf》由会员分享，可在线阅读，更多相关《塑料件尺寸公差25652.pdf（12页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
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 机械制图 尺寸公差与配合注法 3 定义 基本尺寸 basic size 设计给
2、定的尺寸。实际尺寸 actral size 通过测量所得的尺寸。尺寸公差 dimensional tolerance 允许尺寸的变动量。尺寸偏差 dimensional deviation 某一尺寸减去基本尺寸所得的代数差。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。径向收缩率 radial shringkage 指料流方向的塑料收缩率。切向收缩率 tangential shringkage 指垂直于料流方向的塑料收缩率。收缩特性值 contraction chararcteristic value 表示料流方向和垂直于料流方向的塑
3、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。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 1 2 3 4 5 6 7 8 9 10 公差数值 3 36 610 1014 1418 1824 2430 3040 4050 040 5065 658
4、0 80100 120 140 160 180 200 225 250 280 315 355 400 450 500 560 630 710 800 900 1000 1200 5 7 10 14 1400 6 8 11 16 1600 7 9 13 18 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 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，其上下偏差可分配为：60错误!mm，60错误!mm，60错误!mm，60错误!mm，60错误!mm 44 受模具活动部分
5、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：3、4 级附加值为：5 至 7 级附加值为：8、10 级附加值为：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。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 01 ABS 苯乙烯-丁二烯-丙烯腈共聚物 3 4 5 AS 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 P
6、MMA 聚甲基丙烯酸甲酯 PPE 聚苯硫醚（增强）PPO 聚苯醚 PPS 聚苯醚砜 PS 聚苯乙烯 PSU 聚砜 12 PA 聚酰胺 6、66、610、9、1010 4 5 6 氯化聚醚 PVC 聚氯乙烯（硬）23 PE 聚乙烯（高密度）6 7 8 POM 聚甲醛 PP 聚丙烯 34 PE 聚乙烯（低密度）8 9 10 PVC 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
7、量方法 61 公差测量条件 a.标准测量温度为 202；b.相对湿度为（655）%；c.待塑料件成型后 24h 及“后处理”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，按的规定。4 5 NOMINAL DIMENSIONS(mm)TOLERANCES (mm)Fine Commercial Up to 1 Over 1 up to and inc 3 Over 3 up to and inc 6 Over 6 up to and inc 10 Over 10 up to and inc 15 Over 15 up to and
8、inc 22 Over 22 up to and inc 30 Over 30 up to and inc 40 Over 40 up to and inc 55 Over 55 up to and inc 70 Over 70 up to and inc 90 Over 90 up to and inc 120 Over 120 up to and inc 160 Over 160 up to and inc 200 Over 200 up to and inc 250 Over 250 up to and inc 315 Over 315 up to and inc 400 Over 40
9、0 up to and inc 500 Over 500 up to and inc 650 Over 650 up to and inc 800 Over 800 up to and inc 1000 Over 1000 up to and inc 1200 Over 1200 up to and inc 1400 Over 1400 up to and inc 1600 Over 1600 up to and inc 1800 Over 1800 up to and inc 2000 TABLE 1:DIMENSIONAL TOLERANCES-GROUP 1 MATERIALS TABL
10、E 2:DIMENSIONAL TOLERANCES-GROUP 2 MATERIALS NOMINAL DIMENSIONS(mm)TOLERANCES (mm)Fine Commercial Up to 1 Over 1 up to and inc 3 Over 3 up to and inc 6 Over 6 up to and inc 10 Over 10 up to and inc 15 Over 15 up to and inc 22 Over 22 up to and inc 30 Over 30 up to and inc 40 Over 40 up to and inc 55
11、 Over 55 up to and inc 70 Over 70 up to and inc 90 Over 90 up to and inc 120 Over 120 up to and inc 160 Over 160 up to and inc 200 Over 200 up to and inc 250 Over 250 up to and inc 315 Over 315 up to and inc 400 Over 400 up to and inc 500 Over 500 up to and inc 650 Over 650 up to and inc 800 Over 80
12、0 up to and inc 1000 Over 1000 up to and inc 1200 Over 1200 up to and inc 1400 Over 1400 up to and inc 1600 Over 1600 up to and inc 1800 Over 1800 up to and inc 2000 TABLE 3:DIMENSIONAL TOLERANCES-GROUP 3 MATERIALS NOMINAL DIMENSIONS(mm)TOLERANCES (mm)Fine Commercial Up to 1 Over 1 up to and inc 3 O
13、ver 3 up to and inc 6 Over 6 up to and inc 10 Over 10 up to and inc 15 Over 15 up to and inc 22 Over 22 up to and inc 30 Over 30 up to and inc 40 Over 40 up to and inc 55 Over 55 up to and inc 70 Over 70 up to and inc 90 Over 90 up to and inc 120 Over 120 up to and inc 160 Over 160 up to and inc 200
14、 Over 200 up to and inc 250 Over 250 up to and inc 315 Over 315 up to and inc 400 Over 400 up to and inc 500 Over 500 up to and inc 650 Over 650 up to and inc 800 Over 800 up to and inc 1000 Over 1000 up to and inc 1200 Over 1200 up to and inc 1400 Over 1400 up to and inc 1600 Over 1600 up to and in
15、c 1800 Over 1800 up to and inc 2000 MOULD SHRINKAGE AND COEFFICIENTS OF LINEAR EXPANSION MATERIAL Mould Shrinkage per cent 10Coeff.linear expansion K ABS -50-110 ABS-30%glass filled -35-50 Acetal -90-150 Acetal-30%glass filled -35-80 Acrylic -50-90 Cellulose Acetate -80-160 Cellulose Acetate Butyrat
16、e -110-170 Diallyl Phthalate -10-60 Ethylene Vinyl Acetate -230-250 Melamine Formaldehyde -10-50 Nylon 6 -70-170 Nylon 6-30%glass filled -15-30 Nylon 66 -60-110 Nylon 66-30%glass filled -15-30 Nylon 11 -90-150 Nylon 11-30%glass filled -10-40 Nylon 12 -90-130 Nylon 12-30%glass filled -30-70 Phenol Fo
17、rmaldehyde -15-30 Polycarbonate -20-70 Polycarbonate-30%glass filled -20-30 Polycarbonate/ABS(Bayblend)-70-85 Polyester,laminates -10-50 Polyester,thermoplastic Polybutylene Terephthalate -80-180 Polybutylene Terephthalate -30%glass filled -30-60 Polyethylene Terephthalate -70-150 Polyethylene Terep
18、hthalate -30%glass filled -20-40 Polyester,thermoplastic elastomer -140-210 Polyethylene,low density -200-250 Polyethylene,high density -150-200 Polyethylene Oxide-mod-(Noryl)-60-70 Polyethylene Oxide-mod-30%-glass filled -20-30 Polypropylene -110-170 Polypropylene-20%talc filled -70-110 Polypropyle
19、ne-20%glass filled -60-140 Polypropylene-asbestos filled -20-40 Polypropylene-rubber modified -50-140 Polystyrene -35-100 MATERIAL Mould Shrinkage per cent expansion K Polyurethane thermoplastic greater than 50 Shore D equal or less than 50 Shore D Polyurethane,RIM Polyurethane,RRIM Polyvinyl Chloride-rigid Polyvinyl Chloride-flexible Styrene Acrylonitrile Urea Formaldehyde -130-120 150-225 90-150 30-180 50 100 70-250 50-110 30-50 Note:The mould shrinkage and coefficient of expansion of f ibre filled mater ials will vary in directions parallel and perpendicular to the flow.