teel casting resin sand a hot crack prevention measures

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(1) to meet the requirements of the casting filling, try reducing the pouring temperature of molten steel. 0.19% C carbon steel, cast at 1550 ℃ at 1600 ℃, casting, th ermal crack is almost twice as high. (2) For the thin-walled castings, should adopt a higher casting speed. Such as a steel casting, the weight of 125Kg, the wall thickness of 15mm, the casting time of 14 seconds without thermal cracking; extended to 40 seconds observed crack. (3) set in the casting prone to crack and crack prevention tendons, effective measures to prevent the steel casting thermal cracking. (4) timely pine box, but also help to reduce the thermal cracking, because they can reduce the casting shrinkage stress. investment casting china

3, the molding material
valve castings
(1) reduce the amount of resin or thermoplastic resin with the resin, furan resin and coke at high temperatures or less coke, so as to ensure its good high temperature tolerate. (2) in furan resin sand appendages, the thermoplastic resin sand; or contraction blocked the most serious, wood flour, foam beads; or corresponding parts to put plastic in the mold a good concession to improve their high temperature concession. (3) using phosphate curing agent. Sulfonic acid curing agent easily lead to the casting surface sulfurizing cause micro-cracks in the casting surface, and a cracking source. (4) the use of a smaller coefficient of thermal expansion of the molding material, such as chromite sand, etc. instead of quartz sand. (5) thinning of the sand core (type) of the sand layer thickness, such as hollow sand core. Undercarriage track frames
For example: certain types of valve castings, simply by thinning the core sand thickness, change the connection method of the core bone to eliminate the casting hot crack. (6) the use of cold iron, or find other chilling measures reasonably easy to crack. lost wax castings
(7) can effectively reduce the permeability of the coating of the sulfur. 4, the shape and size of the casting of the casting structure is determined by the designer, the producer can not be changed. However, for the size of the garden corner, the wall thickness of the transition at the treatment, in consultation with the design department, with appropriate modifications in accordance with the requirements of the casting production. These factors have an impact steel castings thermal cracking, but for a specific casting, may be only part of the factors is the main. steel casting foundry