大家知道,三点决定一个平面,四点就会产生不平稳(即过定位)现象,而且它总是发生在对角的某一个角上,或对边的某一边上。我们就是根据这个理论,采用螺钉旋入砂箱有间隙的一角(或一边),经过调整,就可以把砂箱对平。这样可以减少为了扣平砂箱而对砂箱进行加工的工时。如附图,在砂箱某一不平的角或边 We all know that three determine a plane, four will have a non-smooth (ie over positioning) phenomenon, and it always occurs in a corner of the diagonal, or on one side of the edge. We are based on this theory, screwed into the flask with a gap of the corner (or side), after adjustment, you can sand box on the flat. This reduces the number of man-hours required to smooth the flask in order to close the flask. As the photo, in the sand box an uneven corner or edge