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Inner hole machining method for molybdenum alloy thin-walled long pipe

A processing method, molybdenum alloy technology, applied in the field of molybdenum alloy processing, can solve the problems of molybdenum alloy tube breakage, poor processing performance of molybdenum alloy, low precision and efficiency, and achieve the effects of improving efficiency, reducing vibration, and reducing the number of broken wires

Active Publication Date: 2016-07-13
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor processing performance of molybdenum alloys, especially for the processing of long tubes with a length greater than 400mm, it is difficult to achieve the requirements of precision and efficiency in traditional processing methods, such as the accuracy and efficiency of turning and boring processing methods are extremely low; Fracture of highly brittle molybdenum alloy tube

Method used

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  • Inner hole machining method for molybdenum alloy thin-walled long pipe
  • Inner hole machining method for molybdenum alloy thin-walled long pipe
  • Inner hole machining method for molybdenum alloy thin-walled long pipe

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Effect test

Embodiment 1

[0041] In this embodiment, the inner hole processing of the molybdenum alloy thin-walled long tube with a length of 700 mm and a wall thickness of 1 mm is realized, and the inner diameter of the inner hole is 18 mm. This method is a compound processing method combining gun drilling, wire cutting and honing, which includes the following steps:

[0042] (1) Datum machining of the outer circle of the molybdenum alloy rod

[0043] The molybdenum alloy rod is clamped by the center frame, and the molybdenum alloy rod is turned to ensure that the straightness of the outer circle is not greater than 0.05mm; the center frame is used for clamping so that the molybdenum alloy rod is evenly stressed and the cutting process is reduced. Medium vibration, increase the axial clamping force;

[0044] (2) Gun drill wire hole

[0045] The molybdenum alloy rod is clamped by "V" type iron, and the molybdenum alloy rod is drilled with a gun drill; the blade surface of the gun drill bit is coated ...

Embodiment 2

[0057] The difference from Example 1 is that the surface of the cutting edge of the gun drill bit is coated with TiN.

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Abstract

The invention belongs to the technical field of molybdenum alloy machining, and discloses an inner hole machining method for a molybdenum alloy thin-walled long pipe of a reactor. The method is a combined machining method in which gun drilling, linear cutting and honing are organically combined, and comprises the following steps: (1) outer circle reference machining of a molybdenum alloy bar, (2) gun drilling of a threading hole, (3) linear cutting of an inner hole and (4) honing finish machining of the inner hole. The linearity of the machined inner hole of the molybdenum alloy thin-walled long pipe is higher than 0.03 mm, the cylindricity of the inner hole is higher than 5 [mu]m, and the roughness of the inner hole is better than 0.2 [mu]m.

Description

technical field [0001] The invention belongs to the technical field of molybdenum alloy processing, and in particular relates to an inner hole processing method of a molybdenum alloy thin-walled long tube used in a reactor. Background technique [0002] The traditional methods of preparing molybdenum tubes include spinning method, extrusion-rolling-drawing method, deep drawing-drawing method and powder metallurgy method, etc., using the above methods to prepare thicker wall thickness, shorter length and diameter Larger molybdenum tubes. At present, a thin-walled long tube part for a high-temperature fuel element requires a structural size of more than 400mm in length, 15-25mm in inner diameter, only about 1mm in wall thickness, and an aspect ratio of more than 40, and the technical requirement is that the coaxiality of the inner and outer circles is ≤0.05mm. The inner hole straightness is ≤0.05mm, and the inner hole roughness Ra is better than 1.6μm. The thin-walled long t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23B41/00B23H9/14B24B33/02
CPCB23B41/003B23H9/14B23P15/00B24B33/02
Inventor 王振东郑剑平
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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