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  本文選題：最大實體要求 + 模擬基準要素��； 參考：《杭州電子科技大學》2015年碩士論文

【摘要】：目前的產品測量技術主要針對公差獨立原則下的基準要素建立的基準坐標體系，當被測要素的基準遵循公差相關要求時，，由于設計基準設定的邊界尺寸與實際測量基準的輪廓不重合，導致被測要素的設計設定基準與實際測量基準不統(tǒng)一，公差標準允許設計設定基準可以相對于測量基準在兩個邊界尺寸之差的范圍內的浮動，進而導致被測要素公差帶也跟隨浮動，從而擴大了被測要素公差帶的范圍。對于復雜的基準布局，這一擴大范圍目前還未有相應的解決方法。為了解決這一問題，本文基于“幾何要素控制點理論”和模擬基準要素的概念，研究最大實體要求下幾何公差基準參考框架的建立方法，并提出一個可行的計算法則來表示基準偏差量對被測要素的補償。 研究內容主要包括以下幾方面： （1）模擬基準要素的建立方法。根據(jù)模擬基準要素的概念，利用VC++6.0開發(fā)平臺編寫最大實體要求下模擬基準要素邊界尺寸的計算函數(shù)，并將獲得的邊界尺寸存入對應的基準信息鏈表。 （2）基準參考框架運動關系的構建方法。利用基準參考框架的概念和幾何要素控制點理論，建立最大實體要求條件下幾何公差模擬基準要素相對于基準實際狀態(tài)的浮動范圍，進而獲得被測要素設計要求和實際測量條件下基準參考框架之間的運動關系，并用曲柄搖桿機構等機構模型等價表示出這種運動關系。 （3）基準參考框架與被測幾何公差帶范圍之間關系的分析方法。利用曲柄搖桿機構表示基準參考框架運動關系的等價機構模型，用曲柄長度和擺桿擺角分別表示基準參考框架的偏差量，其中曲柄長度就是被測目標要素的幾何公差值的擴大量，而擺桿擺角則修改和擴大公差帶的形狀。 本文通過UG NX7.5軟件平臺，利用VC++6.0軟件和UG系統(tǒng)自帶的實現(xiàn)UG/OpenAPI二次開發(fā)功能模塊實現(xiàn)計算機輔助公差設計的功能要求，以位置度公差的測量為實例，驗證當被測要素的基準遵循最大實體要求時，被測要素在設計條件下的基準參考框架對于被測要素公差帶的影響。
[Abstract]:The current product measurement technology is mainly aimed at the datum coordinate system established under the principle of tolerance independence. When the datum of the measured element follows the tolerance related requirements, Because the boundary dimension set by the design datum does not coincide with the contour of the actual measurement datum, the design setting datum of the measured element is not unified with the actual measurement datum. The tolerance standard allows the design of the datum to float in the range of the difference between the two boundary dimensions relative to the measuring datum, which leads to the tolerance zone of the measured element following the float, thus enlarging the range of the tolerance zone of the measured element. For the complex benchmark layout, the scope of this expansion has not yet corresponding solutions. In order to solve this problem, based on the theory of control point of geometric elements and the concept of simulated datum elements, this paper studies the method of establishing the reference frame of geometric tolerance datum under the requirement of maximum entity. A feasible calculation method is proposed to represent the compensation of the datum deviation to the measured elements. The research mainly includes the following aspects: 1) the method of establishing simulation datum elements. According to the concept of simulation datum element, the calculation function of boundary size of simulating datum element under maximum entity requirement is compiled by using VC 6.0 development platform, and the obtained boundary dimension is stored in the corresponding datum information chain list. 2) the method of constructing the motion relation of the frame of reference. Based on the concept of reference frame and the control point theory of geometric elements, the floating range of geometric tolerance simulation datum elements relative to the actual state of the datum is established under the condition of maximum entity requirement. The kinematic relationship between the design requirements of the measured elements and the reference frame under the actual measurement conditions is obtained, and the kinematic relationship is expressed by the equivalent mechanism model such as crank and rocker mechanism. The analysis method of the relation between the reference frame and the tolerance zone range of measured geometry is presented. Using crank rocker mechanism to express the equivalent mechanism model of reference frame motion relation, using crank length and pendulum angle respectively to express the deviation of reference frame. The length of the crank is the enlargement of the geometric tolerance of the measured target element, while the pendulum angle modifies and expands the shape of the tolerance zone. Through UG NX7.5 software platform, using VC 6.0 software and UG system to realize UG/OpenAPI secondary development function module to realize the function requirement of computer aided tolerance design, taking the measurement of position tolerance as an example. When the datum of the measured element obeys the maximum entity requirement, the effect of the reference frame of the tested element on the tolerance zone of the tested element under the design condition is verified.
【學位授予單位】：杭州電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG801

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本文編號：1832416