In the process of sand casting, the performance of sand mold is one of the key factors affecting the final quality of sand casting. The size and surface quality of the casting sand mold will be directly reflected in the size and surface quality of the final sand mold...
After analyzing the defects, another improvement scheme is made, as shown in the figure. In the original scheme, the investment mold steel castings are inverted, the gating system is placed in the middle of the investment mold steel castings, and most of the investment mold steel castings are located...
Unreasonable pouring speed setting of investment casting will also produce insufficient pouring defects. In order to determine the reasonable pouring speed, according to the principle of control variable method, a variety of pouring speed analysis schemes are set for 1560 ℃ and 1600 ℃ pouring temperatures respectively. The momentum...
Another investment casting thin-walled steel casting of ZHY casting was under poured in the trial production process, and the defects were more than 90% and concentrated. The product structure is shown in Figure 1a, and the process scheme is shown in Figure 1b. The insufficient pouring defects are mainly...
In the casting defect scheme, the actual pouring temperature is 1560 ℃, and the actual average pouring speed is 0.38 M / S. in order to determine the reasonable range of pouring temperature corresponding to the actual average pouring speed (without cold lap casting defects), according to the principle...
The support size of a thin-walled steel casting is 400 mm × 310 mm × 270 mm, minimum wall thickness 4 mm, average wall thickness 5 mm, material zgd410-700. The product structure and casting process scheme are shown in Figure 1. According to this process scheme, more than 40%...
Because the exhaust rib is not set in the original scheme, the simulation shows that the gas pressure in the mold shell of the investment casting steel is close to 45 bar before being filled. Therefore, one of the reasons for the insufficient pouring defect of the investment casting...
In recent years, with the application of advanced technologies such as high-performance (steel, non-ferrous alloy, etc.) materials, CAE analysis and technology, the lightweight of auto parts has been realized. With the deepening of automobile lightweight, the average wall thickness of investment cast steel for automobile is becoming smaller and...
For many years, castings and forgings have been used as the product parts of ZHY Casting excavator. The new technology of investment casting was started. In recent years, the product varieties have been gradually expanded, and the product output has been continuously improved. The weight of precision castings has...
Through the testing of the original investment casting prototype, it is found that there are shallow cracks at the intersection of the hook head and the hook tongue through fluorescent magnetic particle testing, as shown in Fig. 1. Generally, the main reason for the formation of hot cracks in...