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Method for thick-wall three-way hot-press axial compensation forming with quartz powder as pressure transmission medium

A transmission medium and axial compensation technology, which is applied in the field of thick-walled three-way hot-press axial compensation molding with quartz powder as the pressure transmission medium, can solve the problems of high cost, achieve high production efficiency, shorten the construction period, and reduce the number of fires Effect

Active Publication Date: 2017-01-11
SICHUAN SANZHOU SCMP NUCLEAR EQUIP MFG CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

After forming, it is necessary to reheat and melt the metal in the tube to get through the product, which is expensive

Method used

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  • Method for thick-wall three-way hot-press axial compensation forming with quartz powder as pressure transmission medium

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Embodiment Construction

[0035] In this embodiment, the thick-walled three-way thermal pressing axial compensation molding method in which quartz powder is used as the pressure transmission medium includes the following steps:

[0036] 1) Mold preparation:

[0037] The tee mold is made of 40CrMo alloy forging. After the shape and size are processed in place, the surface hardening treatment has a hardness of HRC42;

[0038] 2) Prepare blank: material 20# steel, size: Φ420mm×47mm×1080mm;

[0039] 3) Preparation of special solid packing and charging:

[0040] The special solid filler is made of dry quartz sand of 100-140 mesh and dry graphite powder whose weight is 20% of the weight of the dry quartz sand; the filler is dried before filling, and then packed in the pipe for compaction with a 700t press ;

[0041] 4) Prepare the compensation baffle:

[0042] On the one hand, the compensation baffle is used to seal the pipe to prevent the internal medium from leaking out. On the other hand, it is used f...

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Abstract

The invention provides a method for thick-wall three-way hot-press axial compensation forming with quartz powder as a pressure transmission medium. The method comprises the following steps of (1), preparing a mold; (2), preparing a blank; (3) preparing a special solid filler and performing charging, wherein 100-140 meshes of dry quartz sand serve as the main special solid filler, dry graphite powder with the weight being 18% to 22% of the weight of the dry quartz sand is added, and the special solid filler is obtained through blending; and drying is performed before filler filling, then a pipe is filled with the filler and the filler is compacted under the pressure more than 200 T; 4), preparing a compensation baffle, 5), preparing equipment; 6), performing heating; 7), performing lubrication, wherein it must be guaranteed that the working face of the mold is lubricated completely during lubrication, and a lubricating coating which is at least 0.2 mm thick is formed; and 8), performing compaction forming. The method has the beneficial effects that operation is easy, the number of the working procedures is small, the production efficiency is high, the product wall thickness is even, the formed appearance is beautiful, the construction period is short, and the manufacturing cost is low.

Description

[0001] Technical field: [0002] The invention relates to a thick-walled (wall thickness at least 20mm) three-way hot-press axial compensation molding method using quartz powder as a pressure transmission medium. [0003] Background technique: [0004] At present, the general method of hot-pressing the tee is to heat and flatten the pipe larger than the product specification, and then put it in the mold to extrude the bypass and draw it to form a radial compensation process. For the thin-walled tee, the cold pressing axial compensation process is usually used. In the cold pressing three-pass process, the press squeezes both ends of the straight pipe, and at the same time, the straight pipe is filled with high-pressure oil through the hydraulic pump, so that the straight pipe generates axial flow and bulges along the mold on one side of the straight pipe to form a three-way bypass. Due to the high strength of metal at room temperature, a press of several thousand tons can only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/037
CPCB21D26/037
Inventor 曾正涛陈勇李红德周黎明刘志诚
Owner SICHUAN SANZHOU SCMP NUCLEAR EQUIP MFG CO LTD
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