During solidification, the steel casting will produce liquid shrinkage and solidification shrinkage. When the feeding system cannot provide sufficient liquid steel to supplement and shrink the final solidification area of the steel casting, the steel casting will have shrinkage defects with irregular shape and rough surface, and dendrite endings...
During the mold test of the cylinder head, the casting air hole defect on the oil cover shell surface is much more serious than the above situation; During the first and second round of mold test, there are not only a large number of casting pore defects with large...
Six cylinder block is an important part of marine engine. The casting structure is shown in the figure, and its technical quality requirements are high. ZHY casting is produced by sand coated iron mold casting process. Its original mold structure is completely designed according to the resin sand casting...
For the horizontal box free molding line, the parting surface of the production main reducer shell cover is generally selected in the middle of the flange. The selection of the parting surface is not only conducive to the mold lifting, but also convenient for the adjustment of the casting...
The main reducer housing cover is an important component of heavy truck axle, which is matched with the main reducer housing. The outline dimension of the main reducer shell cover produced by the enterprise is 554 mm × 350 mm × 138 mm, the main wall thickness is 7...
1. Chemical composition control The chemical composition of nodular cast iron for wind turbine shall be strictly controlled, especially C, Si, Mg, s, P and rare earth elements. The silicon content shall be appropriately reduced to ensure the requirements of low temperature impact energy. For main frame, wheel hub...
1. Improvement of gating system 1.1 The intermediate injection water inlet is improved to the top injection water inlet At the initial stage of cylinder head mold test, that is, after the first and second rounds of trial production, after analyzing and studying the causes of a large number...
After SAF2507 is smelted to 1 670 ~ 1 700 ℃, turn off the power supply and let it stand for 2 min. during this period, no slag removal operation is carried out (i.e. no slag removal agent is needed), and then turn on the power supply. At this...
The valve body of seawater butterfly valve with nominal size of DN1200 is made of 00Cr25Ni7Mo4N, with a gross weight of 800 kg and a total weight of 1600 kg. The structure of the valve body is shown in Figure 1. In the production process, casting pores often appear...
(1) Proportion control of new material and returned material. The main chemical composition of SAF2507 super duplex stainless steel is shown in Table 1. The metal materials used in SAF2507 steelmaking mainly include new dual phase stainless steel and return alloy steel. The composition of new ingredients after smelting...