Manufacturing process and precision of cast iron T-shaped groove platform

After the casting of the cast iron T-groove platform is completed, vibration sand removal and manual sand removal are used to clean the waste around the cast iron platform blank. After the sand removal is completed, the casting is naturally cooled and subjected to secondary tempering (aging treatment). The casting is heated to 780 ° C in the tempering kiln and cooled to 50 ° C in both the kiln type YAOZHONG and kiln temperature before being discharged from the kiln. During rough machining of castings on cast iron platforms, Jinan produced gantry planers (BAOCHUANG) and sectional milling machines (XICHUANG) are used to shape the cast iron platform into a square or rectangular shape around and above the platform. If a T-groove or U-shaped groove, rectangular groove, etc. need to be machined, BIXU must be placed after planing the plane before machining. If the customer requires high precision and high smoothness, then after rough machining, JINGDU uses our own 6000 * 3000 CNC gantry milling machine produced by Kunming Machine Tool Factory for precision machining. The accuracy of the CNC gantry milling machine after machining is 0.008mm per meter for straightness and flatness, and the smoothness can be controlled within 1.2. After manual polishing, the smoothness can reach 0.8. If drilling or twisting threaded holes on a cast iron platform can also be completed in one go using a CNC gantry milling machine, JINGDUGAO， High smoothness.

1. The casting surface of the flat plate should be made of QINGCHU sand and flat, with a firm coating

2. On flat working surfaces with precision registration levels of 0-3, 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 spacing between sand holes should not be less than 80mm.

3. There shall be no defects such as sand holes, pores, cracks, slag inclusions, shrinkage, scratches, dents, rust spots, etc. that seriously affect the appearance and performance.

4. Usually, scraping technology should be used. The maximum allowable surface roughness Ra for a 3-level flat working surface processed by scraping is 5um.

5. The flatness tolerance of the flat working surface is specified in Table 2.

6. The flat plate should be made of fine grey cast iron or alloy materials, and its working surface hardness should be 170-220HB.

7. The scraping process should undergo color matching inspection. The ratio of the contact point area displayed after research is specified in Table 3, or the number of contact points in a 25mm x 25mm square area is specified in Table 3, and the number of contact points in any 25mm x 25mm area should not exceed 5 points.