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A kind of manufacturing method of radial bearing of screw drilling tool

A technology for radial bearings and manufacturing methods, which is applied in the field of radial bearings of screw drilling tools and laser cladding surfaces, can solve problems such as peeling off of hard blocks and uneven wear of radial bearings, and achieve improved service life, uniform wear, and metallurgical good combination

Active Publication Date: 2016-01-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of uneven wear and peeling of hard blocks in the radial bearing of the screw drilling tool, improve the service life of the radial bearing of the screw drilling tool, simplify the process and reduce the cost, a preparation method for the radial bearing of the screw drilling tool is provided

Method used

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  • A kind of manufacturing method of radial bearing of screw drilling tool
  • A kind of manufacturing method of radial bearing of screw drilling tool
  • A kind of manufacturing method of radial bearing of screw drilling tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Select the 42CrMo cylindrical steel body to be blanked as a rigid body blank, and hot forge the rigid body blank to complete the rough machining of both end faces, outer diameter, inner diameter and chamfering of the rigid body blank. After processing, the bearing steel body is heat treated.

[0018] (2) Laser cladding equipment is Trumpf 6000 watts CO 2 Laser (wavelength 10.6 μm). The material used for the outer circle of the inner shaft sleeve is a Fe-based composite material with a chemical composition of Cr 3 C 2 : 20wt%, WC: 15wt%, Mo: 2.0wt%, Cr: 3wt%, Ni: 2.0wt%, Si: 0.4wt%, Mn: 0.3wt%, Ti: 0.5wt%, the balance Fe.

[0019] The laser cladding output power of the outer circle of the inner shaft sleeve is 4.0KW, the beam scanning speed is 600mm / min, the spot size range is 3mm, the powder feeding volume is 20g / min, the argon gas flow range is 20L / min, and the overlap rate is 50%. . The thickness of the obtained cladding layer is 1.5mm.

[0020] The material...

Embodiment 2

[0027] (1) 45 steel cylindrical steel body is selected as a rigid body blank, and the rigid body blank is subjected to precise thermal rolling and expansion to complete the rough machining of both end faces, outer diameter, inner diameter and chamfering of the rigid body blank. After processing, the bearing steel body is heat treated.

[0028] (2) The laser cladding equipment is a 3000 watt fiber output semiconductor laser (wavelength 808-975nm). The material used for the outer circle of the inner shaft sleeve is a Fe-based composite material with a chemical composition of Cr 3 C 2 : 40wt%, WC: 30wt%, Mo: 5.0wt%, Cr: 6wt%, Ni: 3.0wt%, Si: 0.8wt%, Mn: 0.6wt%, Ti: 1.5wt%, the balance Fe.

[0029] The laser cladding output power of the outer circle of the inner shaft sleeve is 2.0KW, the beam scanning speed is 200mm / min, the spot size range is 6mm, the powder feeding volume is 40g / min, the argon gas flow range is 10L / min, and the overlap rate is 30%. . The thickness of the ob...

Embodiment 3

[0037] (1) Select the 9Cr18 steel cylindrical steel body to be blanked as a rigid body blank, and hot-roll the rigid body blank to complete the rough machining of both end faces, outer diameter, inner diameter and chamfering of the rigid body blank. After processing, the bearing steel body is heat treated.

[0038] (2) The laser cladding equipment is a 4000 watt fiber output semiconductor laser (1070nm). The material used for the outer circle of the inner shaft sleeve is Fe-based composite material, and its chemical composition is Cr 3 C 2 : 30wt%, WC: 20wt%, Mo: 3.0wt%, Cr: 4.0wt%, Ni: 2.5wt%, Si: 0.6wt%, Mn: 0.5wt%, Ti: 1.0wt%, the balance Fe.

[0039] The laser cladding output power of the outer circle of the inner shaft sleeve is 3.0KW, the beam scanning speed is 400mm / min, the spot size range is 4mm, the powder feeding volume is 20g / min, the argon gas flow range is 15L / min, and the overlap rate is 40%. . The thickness of the obtained cladding layer is 2.0mm.

[0040] T...

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Abstract

The invention discloses a manufacturing method for a radial bearing of a screw drill, and belongs to the technical field of laser machining. A Fe-based composite material wearing resistant layer which is 1.5mm-2.5mm thick is arranged on the outer circular surface of an inner shaft sleeve of the radial bearing by laser-cladding; an Ni-based superhard wearing resistant alloy coating which is 1.5mm-2.5mm thick is arranged on the inner hole surface of an outer shaft sleeve of the radial bearing by laser-cladding; the Ni-based alloy consists of the following chemical components: 0.8wt%-1.2wt% of C, 1.5wt%-2.5wt% of B, 5wt%-8wt% of Mn, 10wt%-15wt% of Cr, 2.0wt%-3.0wt% of Si, 1.0wt%-3.0wt% of Al, 1.0wt%-2.0wt% of Nb, 0.2wt%-0.6wt% of N and the balance of Ni. The Fe-based composite material consists of the following chemical components: 20wt%-40wt% of Cr3C2, 15wt%-30wt% of WC, 2.0wt%-5.0wt% of Mo, 3wt%-6wt% of Cr, 2.0wt%-3.0wt% of Ni, 0.4wt%-0.8wt% of Si, 0.3wt%-0.6wt% of Mn, 0.5wt%-1.5wt% of Ti, and the balance of Fe. The manufacturing method disclosed by the invention adopts different processes for cladding two different materials on the outer circle of the inner shaft sleeve and in the inner hole of the outer shaft sleeve, so that processes are simplified and cost is lowered.

Description

technical field [0001] The invention relates to radial bearings of screw drilling tools and laser cladding surface technology, and belongs to the technical field of laser processing. Background technique [0002] Screw drilling tools are one of the most widely used downhole power tools in oil drilling. The radial bearing of the screw drilling tool is located in its transmission part, which is a key component that affects the life of the screw drilling tool. The radial bearing of the screw drilling tool is divided into inner and outer bearing sleeves. The inner sleeve is matched and locked with the transmission shaft, and the outer sleeve is assembled with the casing of the downhole power drilling tool. The two cooperate to form a working surface. The main function is to The torque and rotational speed of the motor are transmitted to the drill bit. During the working process, the inner shaft sleeve tends to move eccentrically around the outer shaft sleeve due to the axial a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05C22C38/50
Inventor 杨胶溪胡星王艳芳
Owner BEIJING UNIV OF TECH
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