用花岗岩石做平板,具有刚性好、硬度高、不锈蚀、不变形、膨胀系数小、能抗弯曲、不受划伤影响、隔热性强、不易粘微尘、抗磁、抗酸、无闪烁反光和维护简单等优点。可用于计量部门作标准检定平板,用于机械加工车间、模具车间分别作划线平台和塑料成型加工的检验平板。我们利用花岗岩石制作了宽为300毫米、长为480毫米的标准平板,经重庆市计量标准管理处检定,达到零级精度。通过几年来的使用证明,花岗岩石是制作平板较为理想的材料。但是花岗岩石坚硬、脆性大,难于加工。下面介绍我们制作时的加工方法。一、坯料下料:用两毫米以下的铁丝两股 Made of granite slab, with good rigidity, high hardness, non-corrosive, non-deformation, expansion coefficient is small, can be resistant to bending, scratch-free, strong insulation, easy to stick dust, diamagnetism, acid, no Flashing light and easy to maintain and so on. Can be used for measurement departments for the standard test plate, for the mechanical processing workshops, mold workshop were crossed platform and plastic molding processing inspection plate. We use granite stone to produce a width of 300 mm, length of 480 mm standard plate, the Chongqing Municipal Measurement Standards Management Department test, to zero-order precision. Through years of use proved that granite is the ideal material for the production of flat. However, granite hard, brittle, difficult to process. The following describes the processing methods we make. First, the blanks blanking: with two millimeters below the wire two shares