Statistics of valve casting scrap before process improvement
Valve castings are one of the leading products in castings, and the annual market demand is very large. However, due […]
Valve castings are one of the leading products in castings, and the annual market demand is very large. However, due […]
There are many reasons for casting defects. Gating system, pouring temperature and flow speed of molten liquid, casting size and
Through repeated trial production and continuous research and development in recent years, ZHY casting has accumulated mature production experience, applied
ZHY casting produces 20 sets of 65j61y64i valves for a power plant. The medium of the valves is high-pressure steam
ASME sa-217 c12a material is a high alloy heat-resistant steel. It is a new material developed by the United States.
John Campbell of the University of Birmingham and others have carried out a lot of research work on the design
Three kinds of Dieless manufacturing processes, including laser selective sintering of coated sand, laser selective sintering of PS powder and
In the process of investment casting, solidification refers to the process that high-temperature liquid metal changes from liquid to solid
Parameter setting: when the pouring speed is 30mm / s and the shell preheating temperature is 600 ℃, the pouring
As shown in Figure 1: after the investment casting pouring starts, the liquid fills the main sprue in about t
The mechanical parts of topology design must have good manufacturability before the products have practical value. The product of topological
In the process of investment casting, although the movement of metal pouring fluid is very complex, it will strictly follow
(1) The minimum sectional area of gating system shall be determined. The minimum area of gating system is generally calculated
In the study of lost foam casting process, the process parameters that have a great impact on the quality of
According to empirical parameters, when the wall thickness of impeller investment casting sand casting is > 40 mm, the minimum
Figure 1 and Figure 2 show HT250 and HT200 gray cast iron respectively Φ The matrix structure of 30mm test
Because the investment mold of impeller blade is fixed with rosin wax based mold material and sodium silicate sand sleeve,
The quality of investment casting directly affects the geometry, dimensional accuracy and surface roughness of investment casting impeller. When investment
Figure 1 and Figure 2 show the graphite structure of HT250 and HT200 gray cast iron under the conditions of
1. Sample preparation According to the requirements of GB / t9439-2010 lost foam casting gray iron castings, it is used
The effect of alloy element Mo on the thermal fatigue properties of gray cast iron was analyzed by comparing two
According to the three carbon source calculation models based on three types of sand casting process parameters, the total carbon
The effects of alloying element Mo on the microstructure and mechanical properties of high-strength gray cast iron were compared and
1.Effect of aging treatment For the engine parts of gray cast iron cylinder head, such as cylinder block, cylinder head,
Pour a positioning plate product. The maximum wall thickness of the casting is 90 mm, the minimum wall thickness is
In the process of thermal cycle, cracks caused by periodic stress due to internal temperature difference, hindered shrinkage and thermal
Casting defect Cause Improvement measures Increase or decrease in outer diameter The external mold shrinks and deforms, the direction of
The microstructure characteristics of gray cast iron determine its mechanical properties. For the microstructure of gray cast iron, the finer
The modifier used in the study is jf-1 modifier. In the experiment, the composition of gray cast iron and the
ZHY casting has developed a frame shell casting with material grade of HT250 and overall dimension of 1300 mm ×