For the tensile strength of chilled cast iron camshaft, it is recommended in technical conditions for automobile engine camshaft that the single cast test bar is poured with molten iron inoculated in furnace, and the tensile strength is more than or equal to 200 MPa. At present, the customers’...
The control of chemical composition is the basis to ensure the casting quality of chilled cast iron camshaft. For chilled cast iron camshaft, the reference value of main composition is recommended in technical specification for automobile engine camshaft (QC / T 544-2000). Specific to customers and products, chemical composition...
The chilled cast iron camshaft uses the chilling effect of the formed chill on the high temperature molten iron to obtain a certain thickness of white layer and transition zone from the surface to the center of the cam lift section, while the rest parts maintain the gray cast...
1.Technical requirements For the technical requirements of metallographic structure, most customers’ products are basically consistent with those recommended in technical conditions for camshaft of automobile engine. Fig. 1 is a schematic diagram of metallographic cutting of all cold shock cam. From the surface layer to the center of the...
Large castings are not rare in iron mold sand coating process casting, but for large engine crankshaft castings with large cross-section and large transverse size, the sand coated iron mold casting process is still lack of experience. In particular, as an important part of the engine, crankshaft bears the...
The results are as follows (1) Through spectral analysis, the chemical composition of the sample is more than the requirements of GB / t5216-2014. In sample 1, the chemical composition was analyzed by three times direct reading spectrum. The content of C element (mass fraction,%) was 1.5, 0.5 and...
Cracks were found at the flange after machining, and the macro morphology of the cracks is shown in Fig. 1. After analysis, the location of crack source is indicated in Fig. 1. Samples are cut around the crack, and the sample numbers are sample 1 and 2. The sampling...
42crmoh steel belongs to medium carbon alloy structural steel, which has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and multiple impact resistance after quenching and tempering treatment, and good low temperature impact toughness. Therefore, 42crmoh steel is designed for diesel engine transmission shaft....
1.Cause analysis and improvement measures It is analyzed that the main causes of casting scrap are: uncontrolled melting process, high pouring temperature, low w(C), w(Si), lower CE than eutectic point and insufficient local cooling of casting.Therefore, the following improvement measures are taken: (1) Control the CE in4.4%Above, where the...
1. Foundry Technology The casting modulus is 4.29 cm, the quality of molten iron is 11 500 kg, the pouring temperature is 1 360 C, the heat insulation in the box is 104 h, and the pouring time is 120 s.The charge ratio is 75% wind-driven iron + 10%...