关键词: 尺寸推荐, 缺失尺寸, 当前轨迹, 相差轨迹, 刚性体合并

Abstract: To achieve a complete 3D dimensioning for part model,a recommendation method of Missing Dimensions (MD) was investigated.On the basis of locus intersection method,the mapping relationship between MDs and differential locus was established according to the generation rules of locus.The generation rules of differential locus were proposed based on reverse reasoning of locus intersection.After determining the differential locus,the extracting process of MDs for a geometric element was developed based on the principle of minimum dimensions.Based on the rigid body recognition method,the extraction algorithm of MDs between rigid bodies was proposed according to the fixation of rigid bodies'equivalent group,and the overall process of recommending MDs for a part was given.A dimensioning model was taken as an example to demonstrate the process of recommending MDs,which illustrated the feasibility of the approach.

Key words: dimensions recommendation, missing dimensions, present locus, differential locus, rigid body's combination