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...
Crankshaft is one of the most important components of automobile engine. For automobile crankshaft, its main function is to realize the power output of engine. On the one hand, it bears the influence of fatigue factors such as torsion and bending, on the other hand, it also needs to...
The gating system is a channel for liquid metal to flow into the crankshaft casting cavity. The pouring system is mainly composed of sprue cup, sprue, sprue nest, cross sprue and internal sprue. The design of the gating system will directly affect the quality of the casting. About 30%...