NEWS
New Investment Casting Process
Author:
Release time:
2024-05-20
Source:
On the basis of developing and perfecting the regular process, a new process method was developed to further improve the quality of castings, increase production efficiency, and expand the application range of investment casting. "Foundry" in 1978, No. 6, reported the Beijing oil pump nozzle factory using cage combination of large module process. Each component of the cage ensures sufficient rigidity of the module and doubles as a gating system, increasing the utilization rate of molten steel by about 10%. Hebei Institute of Technology and others control the solidification time of castings, inner runner and gate rods to make M pieces ≤M inner ≤M rods, and make the solidification stop between the inner runner and the gate rod, and the liquid metal in the gate rod is tilted back to the furnace cylinder to realize gate-free investment casting. In 1982, the second issue of "Casting" reported that Tsinghua University and others used vacuum suction casting to fill and control the solidification time. When the inner runner is solidified and the straight runner is not solidified, the vacuum is released and the liquid alloy in the straight runner returns to the furnace. The process has strong filling performance, thin-walled castings and high utilization rate of molten steel. The release of suction casting vacuum is determined according to the thermal conductivity of the shell and the solidification time of the suction casting. The 3rd issue of "Foundry" in 1984 published an article by Ye Sheng Yong introducing the process of electrophoretic shell making. The wax module is dipped with a conductive coating, and a small amount of chain phosphate is added to the electrophoretic suspension as an electrolyte to adsorb cations on the surface of the refractory material. Under the action of the electric field, the refractory material will undergo electrophoresis, accumulate on the surface of the pattern, and electroosmosis will occur to form a shell with a certain strength. Electrophoresis shell process less, short production cycle. The 4th issue of "Casting" in 1984 reported the research on the production of large and complex aluminum alloy castings by using semi-hydrated gypsum, plus quartz powder, quartz glass and clay as refractory filler in Northwest University of Technology. The 621 uses semi-hydrated gypsum and coal drill stone as refractory filler to reduce the shrinkage of gypsum shell and reduce cracking. Titanium and its alloys are important aerospace and petrochemical materials. In the late 1970 s, investment casting was used to produce titanium alloy castings. China is one of the five largest investment casting titanium alloy producers in the world. The second issue of "Casting" in 1979 was published in Shanghai Iron and Steel Research Institute. Propane was cracked at high temperature and vacuum, and graphite was precipitated in gas phase on the surface of corundum (ethyl silicate hydrolysate liquid shell to carry out investment casting production process of titanium alloy. Beihang Materials Research Institute uses phenolic resin as binder and graphite powder (sand) as refractory material to produce graphite shell, which is roasted in vacuum resistance furnace and carbonized resin binder to produce shell with good strength and permeability, and to produce titanium alloy high-speed pressurized blades. Shenyang Foundry Research Institute published an article in "Foundry" in 1986, introducing the process method of using ZTS-1 resin and toner to make coatings, p-toluene sulfonic acid as curing agent, and graphite sand and ethanol to make coated sand, making shell, shell by high temperature roasting and vacuum treatment to produce titanium alloy castings. "Casting" published an article by Li Bangsheng in the 7th issue of 1987, using zirconia ceramic powder, zirconium sol as binder, preparation of coatings, preparation of shell, titanium alloy investment casting production research.
Next page:
RELATED INFORMATION
What is casting? The development of casting?
2024-05-20
New Investment Casting Process
2024-05-20
Development prospect of casting
2024-05-20
Contact Us
Address: 27 Donghai Second Avenue, Duqiao Town, Taizhou City, Zhejiang Province
Scan code to view mobile phone end