1.First process improvement and verification tracking (1) Change to bottom pouring system. The layout of the ingate of the casting should avoid the original thick position to reduce the risk of overheating at the ingate position. Change the original middle pouring system into the bottom pouring system, modify the...
After sampling the casting defect location, the scanning electron microscope was used for analysis. After ultrasonic cleaning, the casting defect was observed and analyzed by electron microscope (as shown in the figure). It was determined that the casting defect was a shrinkage casting defect. The basic reason for the...
The cylinder head of a certain type of diesel engine produced by ZHY Casting factory has complex structure, compact layout, poor casting process and many hole casting defects in production. This paper analyzes the shrinkage defects of the cylinder head of a diesel engine, and puts forward solutions. The...
A set of gravity casting mould for aluminum alloy cylinder head was sent to the casting workshop. After trial production in the gravity casting workshop, some appearance quality problems were found; After further machining, internal quality problems are exposed. The responsibility of gravity casting workshop is to abide by...
The sand cores in the inner cavity of the cylinder head produced by the coated sand process are (generally refers to the water jacket core, water channel core and oil pipe core). There are sand sticking defects on the surface of the inner cavity (generally refers to the water...
In casting production, due to the uneven wall thickness of the gray cast iron cylinder head, it is easy to produce shrinkage cavity, porosity, depression and other defects in the thick parts. Generally, the method of adding external chill can be adopted, and the method of placing internal chill...
1. Casting process Adopt the core assembly and vertical pouring process, pre assemble the base core, water jacket core, airway core and end core (as shown in Figure 1), and then add a top cover core. Among them, the base, top cover, front and rear end cores and airway...
The tensile strength of gray cast iron cylinder head body is required to reach 300 MPa, and the tensile strength of bolt hole body is required to reach more than 270 MPa; The internal and external surfaces are smooth and clean, and the particle size of residual impurities is...
With the continuous improvement of the quality requirements of diesel engine products in the whole machine factory, higher and higher requirements are put forward for castings. In order to meet the needs of the market, high-grade gray cast iron is currently used to produce cylinder heads. The domestic high-grade...
The existing mould and the cast cylinder head with grinding problems are shown in Figure 1. As shown in Figure 1a, the grinding jig is composed of 4 support columns and 2 front and rear limit columns. During the grinding process, the limit column is inserted into the valve...