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A method for manufacturing an ultra-large cryogenic valve body
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A manufacturing method and low temperature valve technology, which are applied in the field of valve body manufacturing, can solve the problems that the dimensional accuracy cannot meet the design requirements, the consistency of the valve body sealing accuracy is poor, and the axis positioning error is large, so as to reduce the repeated clamping positioning error and reduce welding. Deformation, the effect of avoiding deformation
Active Publication Date: 2021-03-19
武汉善福重型机床有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to solve the technical problems of the traditional valve body manufacturing method, such as large axis positioning error, insufficient low temperature stability, dimensional accuracy that cannot meet the design requirements and poor consistency of the processed valve body sealing accuracy, and provide a valve body manufacturing method.
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Embodiment 1
[0045] The five-way joint mechanical processing method in the present implementation example, it comprises the following steps:
[0046] (1) The blank is prepared for forging;
[0047] (2) Rough boring, rough turning outer circle and plane, processed to the size of the process drawing;
[0048] (3) Carry out programming processing on the CNC machining center, and process four square and round pipe joints and slope joints in one clamping state to ensure that the axes are parallel.
Embodiment 2
[0050] The square and round pipe machining method in the present implementation example, it may further comprise the steps:
[0051] (1) The blank is prepared for forging;
[0052] (2) Rough boring, rough turning outer circle, hole and plane, processed to the size of the process drawing;
[0053] (3) Carry out boring on the deep hole drill to ensure that it is consistent with the wall thickness of the process base circle at both ends;
[0054] (4) Car square dimensions to the requirements of the outer circle drawings to ensure uniform wall thickness;
[0055] (5) Mill the square size of the end face of the valve body and the installation hole, leave a margin of 5mm on the connecting surface, and leave a margin of 10mm in the direction of the hole diameter.
Embodiment 3
[0057] The valve body machining method in the present implementation example, it comprises the following steps:
[0058] (1) The valve cover, five-way joint and square and round pipe are welded into one;
[0059] (2) Roughly milling the square plane with one knife, boring each hole on the axis, leaving a margin of 6mm on the diameter; turning the other side to process the square plane and holes;
[0060] (3) Cryogenic treatment;
[0061] (4) Finely mill the square plane and the holes of the boring axis to the requirements of the drawing, and turn over the other side to process the square plane and holes.
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Abstract
The invention relates to a manufacturing method for an ultra-large low temperature valve body. The manufacturing method comprises the following steps of rough machining of five-way joint forging and machining of a butt groove; finish machining a square pipe and valve cover forging, and machining of a butt groove; welding of the square pipe with a valve cover through a manual argon arc welding method after fixation of the square pipe to a five-way joint with a tool; welding of the five-way joint with the square pipe; and machining of a flange at the other end after completion of welding of thevalve body. The manufacturing method has the advantages of small welding deformation, high manufacturing accuracy and dimensional stability, small clamping number of a workpiece, and low machining cost.
Description
technical field [0001] The invention belongs to the technical field of valve body manufacturing, and in particular relates to a method for manufacturing an ultra-large cryogenic valve body. Background technique [0002] The valve body is an essential part for fluid transportation. The accuracy of the axis of the valve body, the accuracy of the flange sealing surface, and the dimensional stability at -196°C must meet the design requirements. The traditional valve body generally has simple dimensions and is used at room temperature. The processing method is to complete the machining on the machine tool first, then remove the valve body workpiece and surfacing the material on the sealing surface according to the technical requirements, and then process it on the machine tool. To meet the size requirements, finally grind the sealing surface on the grinding machine. However, there will be errors in the re-clamping and positioning of the valve body during the manufacturing proces...
Claims
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Application Information
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