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Remanufacturing method after scrapping of brazing tail thread

A remanufacturing and threading technology, applied in the field of shank manufacturing, can solve problems such as no repair technology, and achieve the effect of saving use costs

Inactive Publication Date: 2019-08-27
刘艺纯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the construction site, scrapped shank tails can only be treated as scrap iron, so far, there is no repair technology

Method used

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  • Remanufacturing method after scrapping of brazing tail thread
  • Remanufacturing method after scrapping of brazing tail thread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] T45-600 Sandvik HL700 rock drill tailpiece.

[0047] Check its material, 23CrNi3Mo (EN40B), male joint length 250mm, shank diameter 52mm, choose 23CrNi3Mo (EN40B), heat treatment method 1: carburizing at 930°C, then air cooling, carburizing layer thickness 0.8-1.0mm.

[0048] The remanufacturing process steps are:

[0049] a: Shot blasting is performed on the scrapped shanks to remove the rust on the surface;

[0050] b: overall non-destructive testing inspection;

[0051] c: Align with a 100 kN (10 ton) press in advance;

[0052] d: Cut off the damaged thread part, 230mm;

[0053] e: Use friction welding to weld the already-processed matching new threaded joint (fixed length 240mm);

[0054] f: After the welding place is annealed at 840°C, the inner and outer welding flashes, that is, welding nodules, are removed;

[0055] g: The welding place is quenched at 930°C again, and then air-cooled;

[0056] h: non-destructive testing of welds;

[0057] i: Straightening...

Embodiment 2

[0061] T45-700 Furukawa HD712 rock drill shank tail.

[0062] The customer requested that the length be longer, and the length was changed to 800mm. Check its material, 22SiMnCr2NiMo (FF710), male joint length 400mm, shank diameter 52mm, 25Cr3MnMo (SANBAR 23), heat treatment method 1: 930°C carburizing, then air cooling, carburizing layer thickness 0.6-0.8mm.

[0063] The remanufacturing process steps are:

[0064] a: Shot blasting is performed on the scrapped shanks to remove the rust on the surface;

[0065] b: overall non-destructive testing inspection;

[0066] c: Use a 100 kN (10-ton) press to straighten in advance;

[0067] d: Cut off the damaged thread part, 270mm;

[0068] e: Use friction welding technology to weld the already processed and matched new threaded joint (fixed length 380mm);

[0069] f: After the welding place is annealed at 840°C, the inner and outer welding flashes, that is, welding nodules, are removed;

[0070] g: The welding place is quenched a...

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PUM

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Abstract

The invention discloses a remanufacturing method after scrapping of a brazing tail thread. The remanufacturing method comprises the following steps of 1, processing, and 2, remanufacturing process. Inthe step 1, the processing comprises the following steps that threaded male joints with different thread standards are subject to heat treatment; and in the step 2, the remanufacturing process comprises the following steps that a, a scrapped drill tail is ground, and shot blasting treatment is performed to remove rust on the surface; b, integral nondestructive inspection is carried out; c, the drill tail is pre-straightened; d, a damaged threaded part is cut off; e, friction welding is used, and the machined matched new threaded joint is welded; f, inner and outer welding flash edges are removed; g, heat treatment is performed at the welding position again; h, nondestructive flaw detection is performed at the welding position; i, the straightening stress is straightened and removed; j, anexternal grinding bed is used, and two-end plane and a middle connecting part are ground, so that the two end surfaces are ensured to be parallel to the middle axis at the same time; and H, checkingis qualified, anti-rust oil is coated, and packaging and warehousing is performed. The method is used for remanufacturing a new tail thread with the scrapped tail thread, the length of the drill bit is consistent with that of the original length, and the use cost is greatly saved.

Description

technical field [0001] The invention relates to the manufacture of shanks and belongs to the technical field of rock drilling tools. Background technique [0002] The shank is the transmission connection part between the rock drill and the threaded rock drilling rod (drill rod), English shank\shanka adapter. It is also one of the consumables that are largely scrapped at the rock drilling site. As an integral part, it is divided into three parts from left to right: threaded end 3, middle mating end 2, and spline end 1. More than 85% of shank adapters are scrapped due to thread damage. At the construction site, scrapped shanks can only be treated as scrap iron, and so far, there is no repair technology. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for remanufacturing scrapped shank threads that can greatly improve material use efficiency. [0004] In order to solve the above technical problems, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 刘艺纯刘朋
Owner 刘艺纯
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