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Cobalt Regulating Rod Component Pellet Extrusion Forming Technology and Its Die

A cobalt regulating rod, extrusion forming technology, applied in metal extrusion dies, fuel elements, reducing greenhouse gases, etc., to achieve the effect of saving manpower, high density, and smooth surface

Active Publication Date: 2011-12-07
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pellet Extrusion Forming Technology and Its Die

Method used

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  • Cobalt Regulating Rod Component Pellet Extrusion Forming Technology and Its Die
  • Cobalt Regulating Rod Component Pellet Extrusion Forming Technology and Its Die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

As shown in Figure 1, the cobalt regulating rod assembly pellet extrusion mold used in the present invention is placed on the workbench 7, and

There are grooves on both ends of the axis of the workbench 7, and a through hole connecting the two grooves along the axis.

The extrusion cylinder 5 is placed in the groove, and the extrusion mold 6 is placed in the extrusion cylinder 5. The extrusion mold 6 is cylindrical, and there are inverted cones on its axis.

Holes and stepped shaft through holes, in the extrusion barrel 5 from top to bottom are the extrusion shaft 1, the graphite pad 2, the magnesium pad 3 and the extrusion die 6. squeeze

The structure of the compression die 6 is shown in Figure 2. The size of the extrusion die 6 is determined according to the actual use. The material of the extrusion die 6 is H13, and the heat treatment

After the hardness HRC: 48 ~ 52.

[0028] (1) powder metallurgy method is used to shape the cobalt green body, and no binder is added in ...

Embodiment 2

[0053] (7) The cobalt pellets are cleaned, and then nickel-plated.

Embodiment 3

[0067] (7) The cobalt pellets are cleaned, and then nickel-plated.

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Abstract

The present invention provides a cobalt regulating rod assembly core block extrusion molding process, which is carried out as follows: (1) using powder metallurgy method to form a cobalt green body; (2) sintering and turning the cobalt green body to the extrusion required Size; (3) put the cobalt green body into the mold and extrude it into a cobalt rod; (4) cut the extruded cobalt rod to obtain a cobalt pellet of the required size; (5) anneal and dehydrogenate the cobalt pellet ; (6) finishing the cobalt pellets to the required size; (7) cleaning the cobalt pellets, and then performing nickel plating. Through the extrusion molding of the method of the present invention, the cobalt regulating rod core block with smooth surface and high and uniform density is prepared, which saves manpower and material resources, reduces mold manufacturing and maintenance costs, and at the same time, the density of the cobalt regulating rod core block is also improved The 8.6g / cm3 increased to 8.7g / cm3.

Description

Cobalt regulating rod assembly pellet extrusion process and its mold technical field The invention belongs to the nuclear fuel element manufacturing technical field, be specifically related to a kind of cobalt regulating rod assembly pellet extrusion Process and its molds. Background technique [0002] The cobalt-59 regulating rod assembled with cobalt pellets becomes a cobalt-60 rod after irradiation, which can be used as an industrial source and a medical source. Usually, the pellets for manufacturing cobalt regulating rod components are ceramic pellets pressed and formed by powder metallurgy, and are sintered to achieve Density required. Cobalt-59 pellets manufactured by powder metallurgy or other processes, due to the addition of a large amount of binder in the powder, The sintered pellets not only have large pores inside but also have many surface cracks; in addition, the dimensional accuracy of the product is low, and the mold Labor costs are high. Contents of...

Claims

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Application Information

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IPC IPC(8): B21C23/08B21C25/02G21C3/04
CPCY02E30/30
Inventor 布仁扎力根辛秀广蔡振芳于勇王永新白志勇任永岗马文军李爱军宋建力
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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