Lingtong is specialized in producing large castings, machine tool castings, machine bed, column, beam, slide table and other large castings casting and machining. The casting materials include all kinds of carbon steel, low-alloy steel, stainless steel, heat-resistant steel, tool steel. According to customer requirements, meet the electrical hardware conforms to the EU ROHS testing standards.
u Take effective measures to reduce the casting temperature to eliminate crack defects, at the same time reducing the temperature drop of molten steel to ensure the filling capacity of steel. Main technical measures: one is to directly reduce the casting temperature, the original pouring temperature of 1600 ℃ -1610 ℃, and now strictly control the temperature at 1570℃ -1580 ℃. Second, to reduce the temperature drop of molten steel. After the mold are assembled, blow heat wind 150 ℃ -200 ℃ to the cavities for 60 min-90min, and stop blowing 5min before pouring.
u Pouring should be fast, first calculate the pouring time, apply plunger type leakage bag to pour in stipulated time.
A: wax mold deformation;
B. shelling process deformation;
C. deformation of the roasting process;
D. Condensation shrinkage deformation;
E. heat treatment heating deformation; F. shot blasting deformation
A: take the mold - take the mold to automatically reduce the deformation of the top mold, cooling with a fixed tire, the group when the tree with a test;
B. Molded - Processed with the gating system to form the frame, the necessary design Auxiliary fixture;
C. Design and Placement Abrasives for Roasting - Roasting;
D. Heat treatment - packing method and the number of solidification to reduce the deformation of the heating process;
E. shot blasting - hanging throw;
F. Correction - to ensure that no deformation of the castings, after the mechanical correction.
Ø We provide free technical service about casting parts and application issues.
Ø Free on-site touring and introduction of our factory
Ø We provide process design and validation for free
Ø We can guarantee on-time delivery of samples and goods
Ø Close follow-up of all orders by special person and keep customers informed timely
Ø All after-sale request will be responded in 24 hours
1. What are the causes of holes on the surface?
A. wax material ash high;
B. dewaxing is not net or shell length "bean sprouts";
C. poor roasting of shells;
D. insufficient water purification: metal liquid deoxidation, degreasing is not sufficient;
E. pouring too fast;
F. Irrational system of pouring is not conducive to exhaust.
2. What is the cause of the surface appears pitting of the casting?
A. layer of silty flour in the high content of impurities;
B. melting deoxidation is not complete;
C. pouring temperature is too high
3. what are the reasons for casting poured not enough?
A. pouring temperature is low;
B. pouring system pressure head low;
C. module fire
4. how to prevention the cracks?
A. Reinforcement at crack;
B. fillet fillet increases;
C. Control of harmful impurities in molten steel (P, S, Pb, Bi, etc.)