Method for manufacturing front guide cylinder of large-size tubular pump

Abstract

The invention discloses a manufacturing method of a front guide cylinder of a large-size tubular pump. The manufacturing method comprises the steps of machining of a plate frame structure, installation of the plate frame structure and cast guide vanes, installation of the plate frame structure and a mask and machining of the front guide cylinder. Pairing and rough machining of the plate frame structure are completed through a thickened auxiliary process flange, and pairing welding of the plate frame structure and the cast guide vane is carried out with the auxiliary process flange as the reference; after the front guide cylinder is completely welded, the auxiliary process flange is removed, and the flange connecting end face of the axial rib plate is machined with the center and the end face of an impeller hub as the benchmark; welding the corrosion-resistant flange and the axial rib plate to ensure the concentricity of the impeller hub and the corrosion-resistant flange and the planeness of the end surface of the flange, and finally, finely machining the end surface, the inner circle and the outer circle of the corrosion-resistant flange by taking the center and the end surface of the impeller hub as references to ensure the thickness required by the design of the corrosion-resistant flange. The method is easy to implement, little in cost and construction period increase and capable of effectively reducing the difficulty of the overall manufacturing process of the guide cylinder.

Description

technical field [0001] The invention belongs to the technical field of machining, and in particular relates to a method for manufacturing a front guide tube of a large-sized tubular pump. Background technique [0002] In the existing machining industry, in order to achieve product performance and reduce manufacturing costs, product components that coexist in castings and welded parts are often encountered, that is, castings are separately cast and roughed, and welded parts are welded and roughed separately. Finally, after the casting rough workpiece and the welded rough workpiece are assembled and connected at the same time, the whole product is finished to the final product size. [0003] The front guide tube is a structural product in which large-size castings and welded parts coexist. It is a key component of a large horizontal through-flow pump. See the structure of the through-flow pump. figure 1 , see the structure of the front guide tube figure 2 . The main body o...

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Problems solved by technology

[0011] In the processing and manufacturing of the existing front guide tube, the connecting flange plate is a corrosion-resistant material flange plate. Due to the influence of the purchase thickness (42mm) of the flange blank plate and the manufacturing width of 2 meters, the flange adopts 4 meters in the manufacturing process. The fan-shaped pieces are tailor-welded into a full circle. After the completion, they are re-welded with the axial ribs. The two weldings cause warping and deformation of the flange plates. In order to ensure a good positioning reference between the plate frame structure and the cast guide vane group, Carry out a rough machining on the connecting flange as a whole, and use it as the reference plane for subsequent grouping. After the plate is welded, the flange will be affected by the welding deformation of the overall structure again, causing warping and deformation. In the process of overall finishing after product welding, the overall or local finishing allowance of the flange plate thickness is often insufficient, that is, Under the premise of satisfying the dimensions H1 and H2 of the end surface finishing distance, the thickness of the connecting flange cannot meet the design requirements, resulting in product scrapping and heavy economic losses to the enterprise

[0012] At present, there are few patents and papers related to research on flange thickness for large-scale cast-welded components. The existing patents mainly focus on the processing and testing of flange flatness.

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