Process for casting thick and large nodular cast iron valve plate
A technology of ductile cast iron and casting technology, which is applied in the field of casting, can solve the problems of casting precision cannot be effectively guaranteed, casting shrinkage cavity and porosity, and many casting processes, so as to avoid quality defects, eliminate the need for machining, and reduce production costs Effect
Inactive Publication Date: 2015-04-29
青岛齐力铸钢有限公司
View PDF0 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The casting process of ductile iron valve plate generally includes the processes of manufacturing pattern, modeling, core making, drying, fitting, smelting, pouring, etc. In the current pouring process of cast iron valves, the finished castings are prone to shrinkage and cavities. The phenomenon of shrinkage and porosity not only has more casting processes, but also affects the production capacity, and the accuracy of the castings cannot be effectively guaranteed, and the scrap rate is high
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment
[0017] The casting process of the thick and large nodular cast iron valve plate of the present embodiment comprises the following steps:
[0018] (1) Manufacture pattern: make pattern with red pine wood;
[0019] (2) Modeling and core making: Put the pattern in the sand box, set up the pouring system, fill the sand box with resin sand by bottom injection method to make the mold, and use the resin sand to make the sand core; the sand box is two Out of the box design, including the upper sand box and the lower sand box, the upper sand box is equipped with several pieces of sand-isolated cooling irons arranged in a staggered manner, and the lower sand box is equipped with several pieces of exposed cooling irons arranged in a staggered manner, the sand-isolated cooling irons and the exposed cooling irons The ratio of thickness and casting thickness is 1:1, and the distance between the sand-separated chills is 0.7 times the length of the sand-separated chills; the distance be...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a process for casting a thick and large nodular cast iron valve plate. The process comprises the steps of manufacturing a sample, modeling, making a core, baking, assembling molds, melting, casting, shaking out sands and cleaning. According to the method, massive direct chiller and external chiller are used on upper and lower surfaces of a casting for chilling, proper placement positions and thicknesses are selected, shrinkage cavity and shrinkage porosity of the casting can be effectively prevented, and the graphite balling state is excellent by means of quick chilling; a feeding head does not needed to be arranged, the casting is simple to clean, and the amount of molten iron is reduced by 5 percent, so that the production cost can be reduced; a semi-closed casting system is adopted, and the ingate is uniformly distributed on the periphery of the casting mold, so that the casting mold is lightly eroded, and the residue retaining effect is good; and under the action of chiller chilling, a thick large nodular cast iron part molten by a cupola furnace has excellent surface molding, does not contain residues or sands and can be used for meeting the production requirement, and the process yield is increased by 5.9 percent.
Description
[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a casting process of a thick ductile iron valve plate. [0003] Background technique [0004] The casting process of ductile iron valve plate generally includes the processes of manufacturing pattern, modeling, core making, drying, fitting, smelting, pouring, etc. In the current pouring process of cast iron valves, the finished castings are prone to shrinkage and cavities. The phenomenon of shrinkage and porosity not only has more casting processes, which affects production capacity, but also the accuracy of castings cannot be effectively guaranteed, and the scrap rate is high. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art, the object of the present invention is to provide a casting process for a thick ductile iron valve plate, which can directly cast cast iron valve p...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22D27/04
CPCB22C9/02B22D27/04
Inventor 刘占向
Owner 青岛齐力铸钢有限公司