Method for casting negative pressure solid cylinder sleeve

Abstract

The invention relates to a method for casting a negative pressure solid cylinder sleeve, which comprises the following steps: manufacturing a foam plastic model of a cylinder sleeve; bonding a molten iron flow passage through which molten iron flows into a cavity when casting the cylinder sleeve; forming the cavity for accommodating the foam plastic model of the cylinder sleeve by using dry sand; placing the foam plastic model of the cylinder sleeve into the cavity; filling sand into the cavity and jolting to form a solid cavity; molding the cavity by negative pressure; casting molten iron into the cavity so that the foam plastic model of the cylinder sleeve disappears due to gasification and combustion; obtaining a raw casting of the cylinder sleeve blank; taking the casting of the cylinder sleeve blank out; and shaking out the sand and cleaning to obtain a required casting of the cylinder sleeve blank. The method for casting the negative pressure solid cylinder sleeve has the following advantages of: high automation degree of production equipment, small labour intensity, high production efficiency, high utilization ratio of molten metal, high yield of castings, low production cost, high production efficiency, high casting precision, low coke consumption, low sulphur dioxide emissions, and less pollution to environment.

Description

technical field [0001] The invention relates to a casting method of a negative-compression type cylinder liner. Background technique [0002] Since the 1930s, the cylinder liner industry has used centrifugal casting technology to produce cylinder liner blanks, and it has been widely used due to the maturity of the technology. The basic technological process is: making centrifuges, making and installing centrifuge steel molds for product casting, making asbestos pads for blocking molten iron during product casting, stirring mud for isolation of molten iron and steel molds, preheating centrifuge Steel mold and molten iron ladle, installation of asbestos pads, installation of centrifugal steel mold end caps, mud application, casting, centrifugal treatment of molten metal, and release of cylinder liner blanks. When casting, one person operates a cylinder pouring machine. [0003] Due to the inherent technical characteristics of centrifugal casting technology, there are very ob...

AI Technical Summary

Problems solved by technology

[0004] 1. "The material utilization rate is very low, and the machining allowance of the inner and outer circles of the product is as high as 2 / 3-1 / 2, and the material waste is huge; the machining cutting volume is huge, which not only accelerates the wear of the machine tool, but also increases the wear of the tool. Consumption reduces production efficiency and keeps production costs high;

[0005] 2. The crystal structure of the inner surface of the rough casting is poor, the size of the casting is not easy to control, and it is easy to produce component segregation during the solidification process under the action of centrifugal force, resulting in product scrap;

[0006] 3. The technical quality of production workers and raw materials are very high, otherwise, the product will easily produce a large number of inner and outer casting defects and be scrapped. Products with casting defects will damage the machine tool and damage the tool;

[0007] 4. Low labor productivity, especially for single-station centrifugal casting, the operators are intensive, and the labor intensity is high, the per capita productivity is extremely low, and the safety factor is low;

[0008] 5. Large emissions of carbon dioxide and greenhouse gases, large environmental pollution, and poor working environment