Machining method of porous thin-wall protective tube with large length-diameter ratio

A technology with large aspect ratio and processing method, which is applied in the processing field of porous thin-walled protective pipes with large aspect ratio, can solve the problems of unrefined processing requirements, low processing efficiency, low processing accuracy, etc. The effect of improving machining efficiency and reducing machining position error

Inactive Publication Date: 2011-11-23
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing process to process the waist-shaped hole, due to the large aspect ratio and thin wall of the protective tube, the rigidity of the protective tube is poor, the alignment of the protective tube and the processing requirements are not refined and optimized, and the pass rate of product processing is less than 50%. %, and the processing accuracy of the product is low, and the processing efficiency is low

Method used

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  • Machining method of porous thin-wall protective tube with large length-diameter ratio
  • Machining method of porous thin-wall protective tube with large length-diameter ratio
  • Machining method of porous thin-wall protective tube with large length-diameter ratio

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Experimental program
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Effect test

Embodiment 1

[0028] The material used for the Φ30mm×1008mm protective pipe is No. 45 high-quality structural steel.

[0029] Using domestic vertical CNC milling machine, the process of tube protection processing is as follows:

[0030] 1) Pipe blanking: Cut the thin-walled pipe 3 with large length-to-diameter ratio into the length required for the protective pipe, and turn external threads at both ends. The length of the pipe 3 is 1008mm, the diameter of the outer circle is Φ30mm, and the length-to-diameter ratio is 33.6, the pipe wall thickness is 1.5mm;

[0031] 2) Pouring low-temperature lead-tin alloy: put the low-temperature lead-tin alloy composed of 55% lead and 45% tin according to the mass percentage into a stainless steel container, heat and melt at 210°C to become liquid; use a stainless steel spoon and funnel to pour the low-temperature lead-tin alloy The tin alloy liquid is poured into the inner hole of the pipe 3, and the two ends are blocked with threaded plugs 2, then hung...

Embodiment 2

[0037] The material used for the Φ39mm×780mm protective tube is LF6M anti-rust aluminum.

[0038] Using domestic vertical CNC milling machine, the process of tube protection processing is as follows:

[0039] 1) Pipe blanking: Cut the thin-walled pipe 3 with large length-to-diameter ratio into the length required for the protective pipe, and turn external threads at both ends. The length of the pipe 3 is 780mm, the outer diameter is Φ39mm, and the length-to-diameter ratio is 20. The wall thickness of the pipe is 1.5mm;

[0040] 2) Pouring low-temperature lead-tin alloy: put the low-temperature lead-tin alloy composed of 65% lead and 35% tin according to the mass percentage into a stainless steel container, heat and melt at 260°C to become liquid; use a stainless steel spoon and funnel to pour the low-temperature lead-tin alloy The tin alloy liquid is poured into the inner hole of the pipe 3, and the two ends are blocked with threaded plugs 2, then hung vertically, cooled and ...

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Abstract

The invention discloses a machining method of a porous thin-wall protective tube with a large length-to-diameter ratio. The method comprises the following steps of: firstly cutting a tube material at a desired length of the protective tube; heating to melt a low-temperature lead / tin alloy material into liquid and then pouring the molten alloy into the inner hole of the tube material; clamping a threaded plug at one end of the tube material by use of a dividing head chuck, compacting a threaded plug at the other end of the tube material by use of a miller center, and straightening and clampingthe two sides of the outer wall of the tube material by use of flat tongs; milling kidney-shaped holes which are uniformly distributed on the wall of the tube material by use of a milling cutter which is mounted on a numerically-controlled milling machine, and milling kidney-shaped holes which are arranged in rows in the axial direction of the tube material; and vertically hanging the tube material subjected to milling, and heating such that the low-temperature lead / tin alloy material is molten and breaks away from the inner hole of the tube material, thus obtaining the porous thin-wall protective tube with large length-to-diameter ratio. The process of machining the porous thin-wall protective tube with large length-to-diameter ratio by the method disclosed in the invention has the advantages that the rate of qualified products is high and is up to above 99%; the machining accuracy is increased and fully meets the design requirement on product accuracy; and the machining efficiency is increased by more than 50%.

Description

technical field [0001] The invention relates to a processing technology of thin, thin-walled steel pipes with evenly distributed pores, in particular to a processing method of a porous thin-walled protection pipe with a large length-to-diameter ratio. Background technique [0002] The protective tube with waist-shaped holes evenly distributed on the tube wall is an important part in the dispensing mechanism of sub-warheads. The throwing mechanism, the bullet casing, the bullet subsystem, the detonation and throwing ignition subsystem, etc. constitute the bullet subsystem. Under the action of the throwing ignition subsystem, the ignition powder in the launcher is ignited, ejected from the ignition tube, ignites the propellant, and the high-temperature and high-pressure gas formed after the propellant burns is ejected from the protective tube, and is distributed in the aluminum foil tube. After pressing, the bellows is pushed radially, and the bellows pushes the bullets, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 韩庆波汪训杰陈妍王华东
Owner 湖北三江航天江北机械工程有限公司
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