Machining Table

The function of Machining Table:

Machining Tables are mainly used as benchmarks for inspecting workpiece errors. Machining Tables play a crucial role in the mechanical manufacturing process and are the basic benchmark tool for inspecting each workpiece before leaving the factory.

Specification requirements for large cast iron plates:

The hardness of the cast iron flat working face is HB107-240. The stability of using this product has been achieved through two manual treatments (manual lengthening of 600-700 degrees or natural aging of 2-3 years). Good.

Machining Table material: Cast iron HT200-300

Machining Table specifications: 100 * 100--3000 * 6000. Platforms larger than this specification can be assembled for use or customized according to drawings

Precision of Machining Table: According to the standard metrological verification regulations. There are four levels: 0, 1, 2, and 3.

Analysis of Technical Requirements for Cast Iron Flat Plates:

1. On the opposite sides of the tablet, there should be threaded holes (or cylindrical holes) for installing handles or lifting devices, and the design of the device position should minimize deformation caused by handling.

2. The tablet should be demagnetized and stabilized.

3. Flat working surfaces usually use scraping technology. For the 3-level flat working surface processed by scraping, the maximum allowable surface roughness Ra is 5 μ m.

4. The flat plate should be made of fine grey cast iron and other materials, and its working surface hardness should be 170-240HB.

5. On flat working surfaces with precision levels of 0 to 3, sand holes with a diameter less than 15mm are allowed to be blocked with the same material, and their hardness should be lower than that of the surrounding materials. The number of sand holes blocked in the working face should not exceed 4, and the distance between sand holes should not be less than 80mm.

6. The casting surface of the flat plate should have clear sand and be flat, and the paint should be firmly applied.

7. The flat working surface shall not have defects such as sand holes, air holes, cracks, slag inclusions, shrinkage, scratches, bumps, embroidery points, etc. that seriously affect the appearance and performance.

8. If threaded holes (or grooves) are set on the flat working surface, their position should not be higher than the working surface.

Precautions for Machining Tables:

The tablet needs to be installed and debugged during use. Then, wipe the working surface of the tablet clean and use it after confirming that there are no problems. During use, be careful to avoid excessive collisions between the workpiece and the working surface of the tablet to prevent damage to the working surface of the tablet; The weight of the workpiece should not exceed the rated load of the flat plate, otherwise it may cause a decrease in work quality, damage the structure of the flat plate, and even cause deformation of the flat plate, making it unusable.

In order to improve the service life and working accuracy of the tablet, it is recommended to scrape or control it above 0.02mm, which can provide a longer service life and calibration cycle for the tablet. According to the relevant information on scraping and grinding, as well as the data obtained from scraping and grinding, the processing requirements of this process can be achieved. For the control of contact spot area, the British standard specifications for flat plates and platforms stipulate that for A (equivalent to JJG 117-91 regulation level 0) and (equivalent to JJG 117-91 regulation level 1) flat plates, the support area ratio shall not be less than 20%, and for B (equivalent to JJG 117-91 regulation level 2) flat plates, the support area ratio shall not be less than 10%. The high points should be evenly distributed, and the proportion of supporting area should not be so high that it causes adhesion to the workpiece. This regulation not only ensures the accuracy of tablet usage, but also takes into account the lifespan of the tablet, which can be referenced.

Technical Parameter：

Note:1. The values in the table are given according to the standard temperature of 20 ℃.2. In the formula in the table: D ---- diagonal length of flat plate working face, mm.3. The flatness tolerance within the range of 0.02A (maximum 20mm) from the edge of the working face is not counted, and any point shall not be higher than the working face.