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%...
The author develops and produces 5 MW wind turbine castings for a domestic customer, of which the input hollow shaft of JF050.04.27 is the key part of the unit. The chemical composition and mechanical properties of the castings are required to comply with DIN EN 1563 standard, the ultrasonic...
Through the numerical simulation software, the temperature field of the casting solidification process can be determined, and the isotherm and isochrone distribution of the casting on the solidification section can be obtained. In addition, the parameters of solidification time t, solidification speed r, temperature gradient grad T and feeding...
There are many types of gating system. For each kind of casting, it is necessary to design or select its mature type according to the casting requirements. Gating system can be divided into two categories according to the section proportion of each unit. Closed type: each section requires a...
As the core part of internal combustion engine, crankshaft plays an important role. Due to the different number and size of crankshaft cranks, and many kinds of cranks, it is applied to all kinds of gasoline and diesel engines. The crankshaft is mostly forged parts and casting parts. The...
The defect analysis of nodular iron crankshaft in the actual production process can be divided into many defects, such as insufficient pouring, shrinkage cavity, porosity, inclusion, etc. for the reduction and control of these defects, the specific links in the casting process can be adjusted, so as to reduce...