零件圖的尺寸標(biāo)注ppt課件-wenkub
2023-04-06 05:47:27 本頁面
【正文】 ctures so that the dimensions will not only meet the design requirements but also other requirements to facilitate machining, measurement and inspection. 使所標(biāo)注的尺寸既能滿足設(shè)計(jì)要求 ,又符合生產(chǎn)實(shí)際 , 便于加工、測(cè)量和檢驗(yàn)。這樣，就會(huì)使加工困難，所以應(yīng)當(dāng)避免封閉的尺寸鏈，將一個(gè)不重要的尺寸去掉。 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 2 Fixing of bearing bracket 軸承架安裝圖 dimension the drawing of bearing bracket， take the ?、 ??、 ??? as the design datum. 注出 軸承架 全部尺寸 ,已知 ?.??.???為 設(shè)計(jì)基準(zhǔn) 。 2. Fully dimension the drawing of bearing bracket， take the ?、 ??、 ??? as the design datum. 注出 軸承架 全部尺寸 ,已知 ?.??.???為 設(shè)計(jì)基準(zhǔn) 。 Bracket 支架 The center height of the axle hole is an important dimension. So it should be directly specified. 軸孔的中心高是重要尺寸應(yīng)直接注出 The distance between the The distance between the centers of the two holes on the bottom board should be directly specified for mounting purposes. 底板上兩孔的中心距離應(yīng)直接注出以方便裝配 Appropriate 標(biāo)注合理 Inappropriate 標(biāo)注不合理 As shown in Fig, dimensions A, B ,C and L form a close dimension chain. Since L=A+B+C, if dimension L has a constant error, dimensions for A， B and C must have very little error, which may lead to difficulties in machining. Therefore, close dimension chains should be avoided and the dimension with less importance should be removed. 圖中的尺寸 A、 B、 C和 L
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