Check the characteristics of the flat: Check the plate after the use of wear and tear, you can re-scratch to restore its accuracy.Experimental plate can be used to test the flatness of the flat, with accurate, intuitive and convenient advantages in the study of the test plate to push the table, the workpiece is relatively smooth, The quality of the cast iron and the quality of the heat treatment on the use of flat plate have a greater impact: or due to residual large internal stress to make the face deformation; or due to intolerance of the wear and tear So that the accuracy can not be maintained; or because the scraping difficult to get a small value of the roughness.Therefore, the use of test plate must pay attention to the choice of cast iron material, the use of aging treatment and other methods to eliminate the residual stress test plate.

Test the technical requirements of flat:

1, flat face can not have a serious impact on the appearance and performance of the sand hole, pores, cracks, slag, shrink loose, scratches, bumps, embroidery and other defects.

2, the surface of the casting plate should be painted solid.

3, the precision grade 0 grade -3 flat surface, the diameter of less than 15mm of the sand hole allows the same material to block, the hardness should be less than the hardness of the surrounding material. The surface of the sand hole should be blocked more than 4 , And the distance between the sand holes should not be less than 80mm.

4, the plate should be used high-quality fine gray cast iron and other materials, the face hardness should be 170-220HB.

5, the flat face is usually used scraping process on the use of scraping 3 flat work surface, the surface roughness Ra maximum allowable value of 5um.

6, the plate should be demagnetized and stability treatment.

7, the plate on both sides, there should be installed handle or ring device screw hole (or cylindrical hole), and the device location should be designed to minimize the deformation caused by handling.

8, if the flat face set on the working hole (or groove), its location should not be higher than the face.

Check the maintenance of the plate

1, in order to prevent the deformation of the test plate, in the lifting test plate, the use of four same length of the wire rope at the same time to hang the cast iron plate on the four lifting holes, the test flat smooth lifting on the transport tool.

2, will test the flat pad point pad, pad level, to ensure that each support point of force evenly to ensure that the entire test flat smooth.

3, the test plate will be installed to test the various points of the plate with a good mat to adjust the mat, the pad is, by professional and technical personnel to adjust the plate to pass the accuracy.

4, test the use of flat-panel light to light up the workpiece, do not move in the test plate relatively rough workpiece, so as to avoid the test plate caused by bumps, draw damage.

5, in order to prevent the overall deformation of the test plate, after use, to the workpiece from the test plate to take down, to avoid the workpiece for a long time on the weight of cast iron plate test plate deformation.

6, the test panel when not in time to wash the face, and then coated with a layer of anti-rust oil, and covered with rust-proof paper, with the test plate will cover the test plate to prevent the usual carelessness caused by the test Damage to the working surface of the plate.

7, test plate should be installed in a ventilated, dry environment, and away from heat, corrosive gases, corrosive liquids.

8, test plate according to national standards for regular weekly inspection, test cycle can be divided into 6-12 months according to specific circumstances.