工程制圖量測說明ppt課件-資料下載頁
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【正文】 差是 ?+ = ? 如果孔的實際尺寸是 ? ,位置公差是 ?+0 = ? 備注 : 位置公差 的改變是隨著孔徑的實際尺寸大小而變化的 . ?40 0 + ? M 當這個孔徑的實際尺寸呈最大實體化 (MMC時 位置公差是 孔的尺寸公差 MMC modifier without Datum 57 ?40 0 + ? M 如果孔的實際尺寸是 ? , 位置公差是 ?+ = ? Position tolerance zone diameter Due to manufacturing variation, the axis is offset from its exact center. Centerline of the hole must be within the position tolerance zone MMC modifier without Datum (cont’d) 58 ?40 0 + ? M 位置公差的計算 X軸方向 , ?x = |實際尺寸 – 理論尺寸 | = | | = Y 軸方向 , ? y = |Actual Exact| = || = 位置變易的計算 = ?(?x2 + ? y2) 求出位置變異的直徑 = 2 ? ?(?x2 + ? y2) = 2 ? ?( + ) = 59 B B1 C1 B2 25 30 A ?25 0 + ? M A B C Part rests flat on Datum A simulator Datum B and C axes are located by these 2 holes 25 30 Positional tolerance zone formed by the exact dimensions from the datum axes, with additional tolerance added for any deviation in the diameter of the hole from MMC. MMC modifier with Datum 60 B B1 C1 B2 25 30 A ?25 0 + ? M A B C M 有效尺寸必須是在取 MMC時 ? A ? A B C ?15 ? ?15 ? B1,C1的有效尺寸是 = B2的有效尺寸是 = 50 MMC修定的應用及數(shù)據(jù) 61 25 30 ? ? Effective boundary for B1, C1 Effective boundary for B2 50 Positional tolerance zone diameter , formed by the exact dimensions from the datum axes. Center of the hole must be within the position tolerance zone ? M A B C M Part is staged in a fixture made up of datum simulators (using sizes of the effective boundaries). No additional tolerance can be added to the position tolerance MMC Modifier Applied to Datum (cont’d) 62 B B1 C1 B2 25 30 A ?25 0 + ? M A B C M Effective boundary must be used when MMC is placed on the Datum ? A ? A B C ?15 ? ?15 ? 50 M Additional tolerance is added for any deviation in the diameter of the hole from MMC. MMC修正應用和位置公差 63 25 30 ? ? Effective boundary for B1, C1 Effective boundary for B2 50 Positional tolerance zone diameter +(Any deviation from MMC for hole diameter), formed by the exact dimensions from the datum axes. Center of the hole must be within the position tolerance zone Part is staged in a fixture made up of datum simulators (using sizes of the effective boundaries). ? M A B C M M MMC Modifier Applied to Both Datum amp。 Position Tolerance (cont’d) 64 最小實體化 ? 當最小實體化是 應用 在一個已核定的公差數(shù)據(jù)中的時侯這個數(shù)據(jù)就是最小實體化數(shù)據(jù) ? 當最小實體化是應用在 公差內(nèi)的在不影嚮零件功能的前提下 ,當要素的軸線或中心平面的形位誤差值小于給出的形位公差值時 ,允許增大相應的尺寸公差 ,即允許以形位公差反過來補償給出的尺吋公差 164。 軸的最小實體化 164。 修正最小實體化公差 164。 組合件的最小實體化 L 65 軸的 最小實體化 ?5 ? A L Width of VBlock to check the hole position is 3 times the diameter of the hole A L A A Width of VBlock to check the hole position is 3 times the width of the groove 5 15 66 最小實體化 L 使用厚薄規(guī)來檢查這間隙 A A 間隙公差在 A面的尺寸 67 組合件的 最小實體化 L 使用厚薄規(guī)來檢查這間隙 A A 間隙公差在 L 注意 :A面的尺寸數(shù)據(jù)不是靜止不變的 .
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