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  • 2026-06-22 19:22:39
GD&T详解--PPT编辑档可获取!

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GD&T详解

"GD&T"全称为 “Global Dimensioning andTolerancing -全球的尺寸和公差的规定”。标准中包含有尺寸标注方法(属我国技术制图标准)与几何公差(属我国形状和位置公差标准)两大部分。其中尺寸标注仅是一种表达方式，无技术含量，且与我国的GB标准基本相同，故本次不作介绍。下面仅对“形状和位置

由于加工过程中工件在机床上的定位误差、刀具与工件的相对运动不正确、夹紧力和切削力引起的工件变形、工件的内应力的释放等原因，完工工件会产生各种形状和位置误差。各种形状和位置误差都将会对零件的装配和使用性能产生不同程度的影响。

因此机械类零件的几何精度，除了必须规定适当的尺寸公差和表面粗糙度要求以外，还须对零件规定合理的形状和位置公差。

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  1. CONNECT:[ UseTime:0.001075s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001594s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002654s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.013378s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001809s ]
  6. SELECT * FROM `set` [ RunTime:0.000645s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001859s ]
  8. SELECT * FROM `article` WHERE `id` = 532224 LIMIT 1 [ RunTime:0.013774s ]
  9. UPDATE `article` SET `lasttime` = 1782653759 WHERE `id` = 532224 [ RunTime:0.017512s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003106s ]
  11. SELECT * FROM `article` WHERE `id` < 532224 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.023091s ]
  12. SELECT * FROM `article` WHERE `id` > 532224 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008020s ]
  13. SELECT * FROM `article` WHERE `id` < 532224 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010206s ]
  14. SELECT * FROM `article` WHERE `id` < 532224 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011229s ]
  15. SELECT * FROM `article` WHERE `id` < 532224 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007124s ]
0.305748s