Cold-drawing die of ribbed cladding pipe, production process and finished pipe thereof

A cladding tube and ribbed technology, which is used in nuclear engineering, wire drawing dies, manufacturing tools, etc., to achieve the effects of convenient manufacturing, low manufacturing cost and good mechanical properties

Inactive Publication Date: 2020-10-30
ZHEJIANG JIULI HI TECH METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above-mentioned utility model mentions the ribbed cladding tube, it does not mention how to design and manufacture the ribbed cladding tube that meets the performance requirements, or what kind of integrated molding method can be used to meet the nuclear industry standard, so as to meet the requirements of sodium cooling Safety and Stability of Stack Fuel Assembly

Method used

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  • Cold-drawing die of ribbed cladding pipe, production process and finished pipe thereof
  • Cold-drawing die of ribbed cladding pipe, production process and finished pipe thereof
  • Cold-drawing die of ribbed cladding pipe, production process and finished pipe thereof

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Embodiment

[0042] For the mold design in this process, the forming tool used in the present invention is a cold drawing die, including a cold drawing outer mold 1 for controlling the outer contour forming and a cold drawing core 2 for controlling the inner diameter.

[0043] Cold drawn outer mold 1 design, refer to figure 1 , figure 2 and image 3, the cold-drawn outer mold 1 is a mold with a hollow area inside, and the hollow area is divided into three sections: the entrance section 1.1, the sizing section 1.2 and the exit section 1.3, and the sizing section 1.2 is formed by the outer diameter of the hole a and four sections of rib groove b, the inlet section 1.1 and outlet section 1.3 are both frustum-shaped grooves, the rib groove b is divided into two sections, the front section is the guide section b-1 and the rear end is the fixed-length section b-2 , the outline of the guide section b-1 gradually shrinks toward the direction of the fixed-length section b-2 until it completely m...

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Abstract

The invention relates to the field of machining and manufacturing of special-shaped section stainless steel precise seamless pipes, and particularly relates to a cold-drawing die of a ribbed claddingpipe, a production process and a finished pipe thereof. The cold-drawing die comprises a cold-drawing outer die for molding the outer contour of a pipe, and a cold-drawing core head for limiting the inner diameter of the pipe, wherein an internal molding cavity of the cold-drawing outer die comprises an inlet section, a molding section and an outlet section arranged in sequence; the inlet sectionand the outlet section are both circular table grooves; the molding section comprises an outer diameter molding hole, and at least one section of rib groove formed in the outer periphery of the outerdiameter molding hole; and the cold-drawing core head is a solid structure, and comprises a fixed inner diameter section, a circular table section and a back cylinder section arranged in sequence. Theprocess comprises the steps of preparation of machined pipes, cold-drawing pretreatment, cold-drawing molding, pipe cutting cleaning, solution treatment and straightening. The die is simple in structure and low in production cost; and the used process is high in production efficiency, excellent in surface quality, high in size precision and excellent in comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of processing and manufacturing stainless steel precision seamless pipes with special-shaped cross-sections, in particular to a cold drawing die for a cladding pipe with ribs, a production process and a finished pipe thereof. Background technique [0002] At present, nuclear fuel assemblies mainly include fuel assemblies for pressurized water reactors, heavy water reactors, and sodium-cooled fast reactors. In the prior art, stable isolation between fuel cladding tubes is one of the keys to ensure the safe operation of fuel assemblies. The pressurized water reactor fuel assembly is mainly composed of zirconium alloy fuel cladding tube and zirconium alloy fuel spacer. The power density is small and the volume is large; the pressurized heavy water reactor fuel assembly is mainly composed of a zirconium metal cladding tube and an outer tube, and the fuel cladding tubes in the outer tube are separated by zirconiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C1/24B21C3/02B21C9/00B21C19/00G21C3/06G21C21/00
CPCB21C1/24B21C3/02B21C9/00B21C19/00G21C3/06G21C21/00Y02E30/30
Inventor 蔡志刚王涛唐睿邱吕强杨红吴静娜张超董洪卫罗霞
Owner ZHEJIANG JIULI HI TECH METALS
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