Design of the cast iron platform: According to the design drawings of GB/T7974-1999 by our professional designers in accordance with your bidding documents, it will be used as the official processing drawing of the contract equipment after verification by both parties.

 

 

cast iron platform

 

Production process: The model is made of local high-quality resin sand, dry type is boxed, and the working surface is facing down to reduce steam holes and slag holes. The box is qualified, and there are only a few risers around the return water inlet.

 

Ingredients: strictly in accordance with the gray cast iron standard: ISO185-1988. The use of Handan 22# high-quality pig iron and low-carbon steel cuttings and various trace elements can meet the different requirements of customers for the required product materials.

The molten iron discharge temperature is above 1480℃ (measured with a thermocouple thermometer). Take a small amount of molten iron cast triangle test piece. After the test piece is qualified, the casting temperature is above 1200℃. Boxing and sand cleaning are carried out at least 24 hours after casting.

 

Aging treatment: Generally, artificial aging and tempering are used to remove internal stress. Tempering temperature is 530°C, constant temperature is 2-3 hours, more than 48 hours, the furnace temperature drops below 200°C, the furnace is cooled naturally, and then transferred to the next process. It is machine-added, and leaves the factory after passing the final inspection.

 

Processing process and equipment:

Casting: use resin sand lost foam, cupola smelting; take the amount of processing according to the actual situation; the shrinkage rate of the manufacturing casting process is 0.8%, and the anti-deformation amount is 3mm/m;

Equipment required: 4mX8m drying kiln, 10T/n, 15T/n, cupola for smelting 10T, 5T, 8T. Hot metal ladle QI-2GAJF, carbon and sulfur combined tester, 100T universal tensile testing machine. For the first time, internal stress is removed, aging temperature is 550 degrees, and equipment required is 4mX8m annealing kiln.

 

Roughing: marking and roughing leave a margin of 5mm. The second time to remove the internal stress is the same as the first time.

Finishing: Machining the top and bottom, leaving a margin of 0.2-0.3mm. And processing the surrounding four sides to meet the requirements. Finally, the working surface is finished and chamfered.