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Brazing method for improving connecting strength of PDC and steel matrix

A technology of connection strength and brazing method, applied in the direction of welding/welding/cutting articles, welding equipment, other manufacturing equipment/tools, etc., can solve the problem that the shear strength and impact resistance toughness cannot meet the brazing strength of polycrystalline diamond composite sheet , the influence of wear resistance of PDC composite sheets, and the large difference in thermal expansion coefficient, etc., to improve the flow spreadability, reduce slag inclusions and pores, and increase the brazing area.

Active Publication Date: 2019-11-15
HENAN MECHANICAL & ELECTRICAL VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PDC composite sheet cannot exceed the limit temperature of 760°C during the brazing process, otherwise the wear resistance of the PDC composite sheet will be affected, and the brazing filler metal below this temperature cannot meet the requirements of polycarbonate in terms of shear strength and impact toughness. Requirements for brazing strength of crystal diamond composite sheet
At present, most of the brazing of PDC drill bits adopts the large-area cladding brazing method. The thermal expansion coefficients of cemented carbide and steel substrates are quite different, and the residual stress of the brazed joint is relatively large, resulting in low strength of the brazed joint

Method used

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  • Brazing method for improving connecting strength of PDC and steel matrix
  • Brazing method for improving connecting strength of PDC and steel matrix
  • Brazing method for improving connecting strength of PDC and steel matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A brazing method for improving the connection strength between PDC and steel matrix mainly includes the following steps:

[0064] Step 1: Carry out grinding, alkali washing, pickling, acetone scrubbing and distilled water washing on the drill bit steel substrate 1 and the PDC cemented carbide segment 10 in sequence, and air dry for later use;

[0065] Step 2: Carry out laser etching treatment on the PDC cemented carbide section 10 air-dried in step 1. The method of carrying out laser etching treatment on the PDC cemented carbide section is: use laser to etch the peripheral surface of the PDC cemented carbide section into regular Or irregular striped lines 11 or reticular lines 12, the depth of the striped lines 11 and the reticular lines 12 is 0.05 mm, the line spacing is 1mm, and the PDC cemented carbide segments 10 after the laser etching process are sequentially electroless plated Cobalt and electroplating nickel treatment, the method for described electroless cobalt...

Embodiment 2

[0072] A brazing method for improving the connection strength between PDC and steel matrix mainly includes the following steps:

[0073] Step 1: Carry out grinding, alkali washing, pickling, acetone scrubbing and distilled water washing on the drill bit steel substrate 1 and the PDC cemented carbide segment 10 in sequence, and air dry for later use;

[0074] Step 2: Carry out laser etching treatment on the PDC cemented carbide section 10 air-dried in step 1. The method of carrying out laser etching treatment on the PDC cemented carbide section is: use laser to etch the peripheral surface of the PDC cemented carbide section into regular Or irregular striped lines 11 or reticular lines 12, the depth of the striped lines 11 and the reticular lines 12 is 0.08 mm, the line spacing is 2mm, and the PDC cemented carbide segments 10 after the laser etching process are sequentially electroless plated Cobalt and electroplating nickel treatment, make PDC cemented carbide section form one ...

Embodiment 3

[0081] A brazing method for improving the connection strength between PDC and steel matrix mainly includes the following steps:

[0082] Step 1: Carry out grinding, alkali washing, pickling, acetone scrubbing and distilled water washing on the drill bit steel substrate 1 and the PDC cemented carbide segment 10 in sequence, and air dry for later use;

[0083] Step 2: Carry out laser etching treatment on the PDC cemented carbide section 10 air-dried in step 1. The method of carrying out laser etching treatment on the PDC cemented carbide section is: use laser to etch the peripheral surface of the PDC cemented carbide section into regular Or irregular striped lines 11 or reticular lines 12, the depth of the striped lines 11 and the reticular lines 12 is 0.05-1 mm, the line spacing is 1-4 mm, and the PDC cemented carbide segment after laser etching 10 Carry out electroless cobalt plating and electroplating nickel treatment successively, make PDC cemented carbide section form one d...

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Abstract

The invention discloses a brazing method for improving the connecting strength of PDC and a steel matrix. The brazing method comprises the following steps that the drill bit steel matrix and a PDC hard alloy section are pretreated; the pre-treated PDC hard alloy section is subjected to laser etching treatment, then cobalt plating and nickel plating are carried out on the PDC hard alloy section insequence, so that the PDC hard alloy sections form a cobalt-nickel composite coating; a tooth hole is machined in the drill bit steel matrix, and the circumferential surface of the tooth hole is subjected to wire drawing treatment and then washed with acetone; the circumferential surface of the PDC hard alloy section coated with the cobalt-nickel composite coating and the circumferential surface of the tooth hole after wire drawing treatment are coated with elemental boron and nickel-cerium alloy mixed powder; after a brazing filler is placed on the bottom of the tooth hole coated with the elemental boron and the nickel-cerium alloy mixed powder, the PDC hard alloy section is placed into the tooth hole, and then a brazing filler is placed between the PDC and the circumferential surface ofthe tooth hole to obtain a brazing assembly; and the brazing assembly is placed in a resistance furnace for heating, the temperature is cooled to room temperature along with the furnace, then the assembly is taken out, and the high-strength connection of the PDC and the steel matrix is completed. According to the brazing method, the strength of the braze welding head and the service life of the PDC drill bit are prolonged.

Description

technical field [0001] The invention relates to the technical field of connection between PDC and drill bit steel substrate, in particular to a brazing method for improving the connection strength between PDC and steel substrate. Background technique [0002] PDC drill bit, that is, polycrystalline diamond compact drill bit, is one of the three major innovations in drilling technology in the 1980s. It has high-efficiency and high-quality performance and is widely used in oil exploration and geological drilling. The various stresses generated when breaking rocks require the drill bit to have sufficient strength and toughness. In the past, due to the unsatisfactory brazing quality between the PDC composite sheet and the drill bit steel matrix, the PDC composite sheet fell off and fragmented. Therefore, the key technology in the production process of PDC drill bit is how to improve the brazing quality of PDC composite sheet and drill bit steel matrix, especially to improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/20
CPCB23K1/0008B23K1/008B23K1/20B23K1/206B23K2101/20B23K2103/04B23K2103/50
Inventor 杜全斌张肇伟王星星龙伟民王晓侃耿美娟周航台畅袁玲和纠永涛上官建林徐东
Owner HENAN MECHANICAL & ELECTRICAL VOCATIONAL COLLEGE
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