毛坯划线时一般把它顶在三只千斤顶上，首先要把毛坯找正。
毛坯找正的原则如下：
① 为了保证不加工面与加工面间各点的距离相同（一般称壁厚均匀），应将不加工面用划线盘找平（当不加工面为水平面时），或把不加工面用直角尺找垂直（当不加工面为垂直面时）。
② 如有几个不加工面时，应以面积最大的不加工面找正，并照顾其他不加工表面，使各处壁厚尽量均匀，孔与轮毂或凸台（搭子）尽量同心。
③ 如没有不加工平面时，要以欲加工孔毛坯和凸台（搭子）外形来找正。对于有很多孔的箱体，要照顾各孔毛坯和凸台，使各孔均有加工余量而且尽量与凸台同心。
在光坯上划线时，工件与划线平台的接触面，划线平板应该是已加工的基准面，不存在向毛坯划线那样的找正问题。光坯划线应以加工的设计基准作为划线基准。
① 以两个互相垂直的平面为基准。
② 以一个平面与一个中心平面为基准。
③ 以两个互相垂直的中心平面为基准。划线的基准如果是平面，可直接在划线平台上用高度游标尺划线。如基准是中心平面，则应先将此中心平面找出，然后从中心平面出发，用高度游标尺划线。
镁铝平尺设计合理，外型美观，保证精度。划线平板镁铝轻型平尺在使用时要先进行安装调试。然后把镁铝轻型平尺的工作面擦拭干净，在确认没有问题的情况下使用，使用过程中，工件的重量更不可以超过镁铝轻型平尺的额定载荷，否则会造成工作质量降低，还有可能损坏镁铝轻型平尺的结构，甚至会造成变形，使之损坏，无法使用。要注意避免工件和镁铝轻型平尺的工作面有过激的碰撞，防止损坏镁铝轻型平尺的工作面。严守“以质量求发展，以信誉求生存”的经营方针，是为了适应顾客日趋提高的质量要求，是提高产品质量的需要。
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手机：13231751756
联系人：徐经理
Blank when it crossed the top three in general only the first place, or the blank is looking for. The principle of blank find are as follows: (1) to ensure that no processing surface and processing surface of different points between the same distance (generally called wall thickness), should not processing surface use crossed dish make level (when not processing surface is negative), or not processing surface with the ZhiJiaoChe find vertical (when not processing surface is vertical plane). (2) if there is some processing surface should be specified in the area's largest not processing surface is looking for, and take care of other not processing surface, make everywhere as far as possible even wall thickness, the holes and wheel or convex platform (take the son) try to work. (3) if not not processing, to be in the plane to processing hole blank and convex platform (take the son) shape is looking for. For a very porous chamber, want to take care of the hole blank and convex platform, make each hole all have machining allowance and as far as possible with convex platform with one. In the light on billet, crossed the workpiece and crossed the contact area, crossed flat platform should be processed, does not exist to the point blank that find problems are crossed. The light should be crossed by processing of casting design standards as the benchmark crossed. (1) to two mutually perpendicular to the plane of the benchmark. With the aid of a plane and a center for the datum plane. (3) to two mutually perpendicular plane as a benchmark. The center of the The benchmark if is crossed, can be directly in the plane on the platform of high swim with crossed ruler crossed. Such as the benchmark is central plane, it should be the first plane, and then find out from the center of central plane with highly swim ruler crossed.
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