1. Chemical composition The shell casting adopts ZG270-500. The alloy has certain plasticity and toughness, high strength and hardness, and its microstructure is austenite and ferrite. It has good machinability, and can also bear large loads. Its chemical composition is shown in the table. ω(C) ω(Mn) ω(P) ω(S) ω(Fe)...
1. Determination of casting process plan for BOP shell According to the solidification simulation analysis of the product digital model, combined with the structure of the BOP shell casting, considering the core and forming problems, the casting process plan of the BOP shell casting with the rectangular cavity downward...
The product structure includes single-gate blowout preventer and double-gate blowout preventer, and the material is ASTM A487 Grade 4. Taking the single-gate BOP as an example, the outline dimensions of the BOP shell casting are shown in Table 1, the net weight is 3580kg, and the structure of the...
Oil and gas play an important role in the energy field, and the oil and gas service industry is closely related to the development of oil and gas. With the international oil service giants such as Baker Hughes in the domestic market layout, the high-end market demand is also...
The Siemens motor shell lost foam casting produced by ZHY Casting using the lost foam process has an overall dimension of 1 240 mm × 800 mm × 700 mm, the mass of lost foam casting is about 780 kg, and the material grade is ASTM48A30C (equivalent to HT200~HT250)....
The China Foundry Association hosted the evaluation and promotion meeting of the scientific and technological achievements of “R&D and application of robot fully automatic precision casting shell production line” completed by AVIC Engineering Integration Equipment Co., Ltd. in Zhenjiang New District, Jiangsu Province. In order to continuously improve the...
During casting production, the causes of oxidation slag inclusion defects are: ① The oxide slag on the liquid surface is not cleaned during molten iron smelting; ② The slag attached to the inner wall of the ladle is re melted into the casting due to the uncleanness of the...
For defects visible to the naked eye on the casting surface and the parts with defects found during flaw detection, 10mm shall be made by wire cutting × 10 mm × 10 mm test piece. Then, ultrasonic cleaning of the sample with acetone and absolute ethanol for 2-3 times,...
A company used the wet casting method to produce a certain type of automobile shell castings, which are made of GX40CrNiSi25-20 (German standard is 1.4848, national standard is 2520 stainless steel). The casting defect rate in the production process is as high as 20%. In order to reduce the...
1. Design of turbine casing pouring system The internal and external contours of turbine shell parts are relatively complex. When designing the casting system, factors such as the casting and exhaust of the outer mold and sand core should be considered, and factors such as sprue, runner, ingate, riser...