For a long time, the cylinder block and cylinder head have been made of gray cast iron. Due to the demand of energy saving and lightweight, some enterprises use Al alloy to manufacture the cylinder block and cylinder head, which greatly reduces the casting quality and reduces the fuel...
The original material of zc170 cylinder head is HT300, the technical requirements are WCu = 0.5% ~ 0.8%, WCR = 0.2% ~ 0.4%, WMO = 0.2% ~ 0.35%, and the hardness of the body should be more than 190hbw. The overall dimension of cylinder head is 355mm × 230mm...
1. Primary raw materials Q12 pig iron, industrial scrap, vermicularizing agent (wre = 9% – 11%, WMG = 4% – 6%), calcium silicate inoculant. The particle size of vermicularizing agent is 5-25 mm, and that of calcium silicate and inoculant is 3-8 mm. The casting process of the cylinder...
Three kinds of annealing process were selected, and the annealing time was 18 h, 11 h and 8 h, respectively. After annealing, the residual stress value detected by different processes. The test of 18 h annealing process was repeated for two rounds, and the stress at each point of...
The structure of 11 l engine cylinder head casting is shown in Figure 1, and the overall dimension of the casting is 1 002 mm × 420 mm × The average wall thickness is about 5 mm. It is required that the tensile strength of the body is more...
Through the above analysis, the process was optimized: the furnace holding time was extended to about 8 h, the temperature gradient of cooling was controlled by human intervention, and the data of casting heating, holding and cooling were collected to provide data support for subsequent improvement. The optimized annealing...
The structure of a 13 l cylinder head casting is shown in Figure 1, and the overall dimension of the casting is 1 000 mm × 400 mm × The average wall thickness is about 5 mm. The customer requires that the tensile strength of the body is more...
The residual stress of cylinder head castings has always been an important problem in cylinder head casting. After casting, due to the different cooling rate of each part of the casting, the shrinkage of each part is different, which will restrict each other and produce stress. This kind of...
With the economic development of the country, all walks of life are developing rapidly, and the machinery industry is also growing steadily, especially the forklift industry. The demand for supporting oil cylinders for forklifts is also increasing gradually. In order to complete the production tasks on time and in...
The poor machinability is a common problem of Engine Castings in China, and it is also the biggest gap between domestic castings and foreign castings. Even though the chemical composition, matrix microstructure and hardness of domestic castings and imported KD castings are similar, the machinability of domestic castings is...