Cases of Application on Rotor-Conveyor Lines of Casting Methods with Crystallization of Metal under Pressure
Processy litʹâ, 2019, Tom 138, №6, p.38-51
DOI:
https://doi.org/10.15407/plit2019.06.038Keywords:
casting, metal castings, rotor-conveyor lines, squeezing casting, crystallization under pressure, casting conveyor, squeezing chamber, Lost Foam casting, gasified patternsAbstract
Received 23.09.2019
UDK 621.74.02, 621.74.041
The review analyzes the most characteristic technical solutions and examples of methods for casting metal with crystallization under pressure (CCP) and squeeze casting with crystallization under pressure (SCCP). These methods, compared with gravity casting, can significantly increase the utilization of metal, reduce casting defects by gas and shrink pores, segregate, anisotropy the structure and properties, increase the density, as well as the mechanical and operational properties of cast metal to levels not inferior to the mechanical properties of forgings and rolled metal. Crystallization under pressure is widely used for non-ferrous metals and alloys and not enough for steels and cast irons due to the low resistance of pressing chambers and molds. An analysis of the well-known technical solutions for supplying and squeezing metal into a mold, lining of squeezing chambers, metal wires, methods and values of application to pressure metal is aimed at creating the prerequisites for the use, automation of CCP and SCCP in the concepts of designing rotor-conveyor lines (RCL) to realize the innovative capabilities of high-performance casting processes. In a number of examples, resource-saving technology Lost Foam casting (LFC) with gasified patterns is described, which allows one to obtain high-precision castings and repeatedly regenerate flowing dry molding sand in a closed pipeline conveyor with the ability to compact it in molds when moving on the RCL and to simplify removing out castings. Based on the potential of LGM, an attempt is made to create concepts of complementing the capabilities of LFC, CCP and SCCP with technical solutions for the design of RCL. Comparative technical and economic characteristics of methods for producing castings of complex shape are considered.
Also, significant prospects are indicated for the use of magneto-dynamic metering mixers for RCLs, which provide a high metal feed rate when casting molds or squeezing chambers.
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