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Centrifugal casting method for flange casting with bolt holes

A technology of centrifugal casting and centrifugal casting machine, which is applied in the field of casting, and can solve problems such as the inability to effectively guarantee the accuracy of bolt holes, many casting processes, and high scrap rate, and achieve the effects of high raw material utilization, excellent overall performance, and low cost

Inactive Publication Date: 2016-06-29
QINGDAO NPA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Flange castings have at least one flange with a bolt hole structure for connecting other components, such as flange pipe fittings, valves, etc. In the current flange casting process, there are no bolt holes on the finished flange of the flange casting, which requires Machining bolt holes not only requires more casting processes, which affects production capacity, but also the accuracy of bolt holes cannot be effectively guaranteed, resulting in a high scrap rate

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0012] (1) Smelting: put the selected raw materials into the electric furnace for smelting, wait until the raw materials are melted into molten metal, carry out composition testing on the molten metal, and add enough missing elements to the molten metal according to the test results to meet the chemical composition requirements of the material, and then continue Heating to make the molten metal temperature reach 1700°C;

[0013] (2) Casting mold preparation, the mold adopts a metal mold with bolt hole patterns on the mold;

[0014] (3) Casting molding: Preheat the casting mold to 850°C to keep a constant temperature, start the centrifugal casting machine, drive the casting mold installed on the centrifugal casting machine to rotate, pour the molten metal into the casting mold, and cast it;

[0015] (4) Shut down the casting to take out the mold: After the casting is naturally cooled to 800 ° C for 15 minutes, stop the machine and take off the casting mold, cool it to room temp...

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Abstract

The invention discloses a centrifugal casting method for a flange casting with bolt holes. The centrifugal casting method comprises the steps that the centrifugal casting process is adopted, and the casting is machined through smelting, casting molding, machine halt and casting mold stripping; when a material is smelted, molten metal is required to reach a certain temperature; casting molding is conducted, a casting mold needs to be preheated, and a constant temperature needs to be maintained; and machine halt and casting mold stripping are conducted, specifically, after the casting is naturally cooled to a certain range and lasts for 10-15 minutes, a machine is halted, the casting mold is removed and cooled to the room temperature through water, and the casting is taken out. According to the centrifugal casting method for the flange casting, compared with forging and pressing manufacturing, no complex production equipment is needed, the investment is small, and the cost and the installation and maintenance cost are low; the machining amount is small, the raw material utilization rate is high, and the waste of raw materials is avoided; and the casting machined through centrifugal casting is precise in size and structure, good in mechanical performance and excellent in overall performance.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a centrifugal casting method of flange castings. Background technique [0002] Flange castings have at least one flange with a bolt hole structure for connecting other components, such as flange pipe fittings, valves, etc. In the current flange casting process, there are no bolt holes on the finished flange of the flange casting, which requires Machining bolt holes not only requires more casting processes, which affects production capacity, but also the accuracy of bolt holes cannot be effectively guaranteed, resulting in a high scrap rate. Contents of the invention [0003] In order to overcome the above-mentioned technical problems in the prior art, the object of the present invention is to provide a centrifugal casting method for flange castings with bolt holes, the centrifugal casting method adopted, the castings can withstand higher shear force and tension ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/00B22D13/10
Inventor 常维宁
Owner QINGDAO NPA IND
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