CN100557187C

CN100557187C - The diamond compact bit and the drill bit manufacture craft that have built-up pillar

Info

Publication number: CN100557187C
Application number: CNB2006100178955A
Authority: CN
Inventors: 阎冠欣; 彭桂湘; 刘克林; 张志罡; 马明旺; 万艳丽
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-06
Filing date: 2006-06-06
Publication date: 2009-11-04
Anticipated expiration: 2026-06-06
Also published as: CN1858396A

Abstract

The present invention relates to have the diamond compact bit and the drill bit manufacture craft of built-up pillar, this drill bit is the PDC Noncoring drill bit, at the middle part of bit body (1) fixed combination pillar (2); Described built-up pillar mainly by pillar (2), be fixed on the supporting carcass (3) on pillar (2) body, the PDC (5) that is fixed on the supporting carcass (3) forms, also be provided with the water inlet eye (4) that connects the pillar body on the pillar (2) and between PDC (5) and pillar (2), PDC seat (6) be set.Described manufacture craft, be to produce PDC bit body (1) with known method earlier, privileged site at described bit body (1) reserves the space of placing built-up pillar (2), then the built-up pillar (2) that processes is fixed on the described PDC bit body (1), PDC (5) is fixed on the supporting carcass (3) of built-up pillar at last.Superiority of the present invention is: cost is low; The intensity height that is connected between built-up pillar and the steel body, difficult drop-off or sealing-off; Improved the total quality of drill bit greatly; Can not influence drilling efficiency; Manufacture craft is simple; Improved manufacturing efficient.

Description

The diamond compact bit and the drill bit manufacture craft that have built-up pillar

(1) technical field

The present invention relates to diamond compact bit, the manufacture craft of special centreless diamond compact bit and this kind drill bit.

(2) background technology

Diamond compact (PDC) drill bit in these years is widely used in fields such as oil, exploration, geological prospecting, water conservancy and hydropower construction, road and bridge construction, mining.The PDC drill bit generally can be divided into coring bit and Noncoring drill bit.For Noncoring drill bit, in manufacture process, be difficult to process the PCD solder side, or, often adopt the pillar that installation is made by carbide alloy on the PDC bit matrix to weld support as PDC because of special requirement owing to its position is restricted.Being about to the carbide alloy pillar welds or is pressed in the bit matrix with interference fit.Though this method has solved the many difficult problems in the PDC drill bit manufacture process, also has many deficiencies.1, the carbide alloy pillar cost as support is very high; 2, weld strength is limited, and sealing-off, case accident often take place; 3, the carbide alloy pillar is difficult to control in bit matrix upper position angle, influences drill bit precision and drilling efficiency; 4, often than the big 2-3 millimeter of PDC diameter, when creeping into than hard formation, it is comparatively serious to influence efficient for the diameter of carbide alloy pillar; 5, single pillar installation production efficiency is low.

(3) technology contents pin

At the defective of above-mentioned existence, the invention provides the manufacture craft of the diamond compact bit that has built-up pillar and this kind drill bit.

In order to realize that described purpose the present invention is according to following technical scheme.The diamond compact bit that has built-up pillar is the PDC Noncoring drill bit, is made up of bit body and the built-up pillar that is positioned at the bit body middle part, and described bit body is mainly steel body formula and matrix-type or tire steel body formula; Described built-up pillar comprises pillar, be positioned at supporting carcass on the pillar, be fixed on the PDC on the supporting carcass and run through the water inlet eye of pillar body.

The PDC seat is set between PDC and pillar.

The diamond compact bit manufacture craft that has built-up pillar is as described below:

Earlier produce the PDC bit body, reserve the space of placing built-up pillar at the middle part of described bit body, then the built-up pillar that processes is fixed on the described PDC bit body, PDC is fixed on the supporting carcass of built-up pillar at last with known method.

Built-up pillar is pressed on the bit body with the interference fit method, or is fixed on the bit body in the mode that is threaded, or is fixed on the bit body with welding manner.

The manufacture craft of described built-up pillar is as described below: according to designing requirement processing graphite mould and steel body, the steel body is placed in the graphite jig, and adding carcass powder material, binder alloy and borax mixed material, then die assembly is sent into and be heated to 950 ℃～1200 ℃ and be incubated 10～60 minutes in the agglomerating furnace, come out of the stove when being cooled to below 850 ℃, move back mould below 200 ℃, on request pillar is processed into needed size and geometry after moving back mould, and processing water inlet eye promptly gets built-up pillar on the pillar body.

In sum, superior part of the present invention is: 1, cost is low; 2, the contact surface of built-up pillar and bit matrix is big, weld, be pressed into or be threaded after the intensity height, difficult drop-off or sealing-off; 3, the orientation angles of each PDC welding position is very accurate, has improved the total quality of drill bit greatly; 4, the back supporter of each PDC welding position is identical with the PDC diameter, can not influence drilling efficiency; 5, built-up pillar is assembling separately, and manufacture craft is simple; 6, two or more pillars of disposable assembling have improved manufacturing efficient.

(4) description of drawings

Fig. 1 is the perspective view of original centreless formula drill bit.

Fig. 2 is the perspective view of bit body of the present invention and built-up pillar.

Fig. 3 is the perspective view of built-up pillar of the present invention.

Fig. 4 is the operation drawing of graphite jig of the present invention and assembly.

(5) specific embodiment

Concrete structure of the present invention is referring to Fig. 2, Fig. 3.This diamond compact bit that has built-up pillar is at Noncoring drill bit.Noncoring drill bit is made up of disclosed existing PDC drill bit 1 and built-up pillar 2 two parts of being positioned at bit body middle part.The built-up pillar of having made can be welded on the PDC bit body, or is pressed in the PDC bit body with the interference fit method, or with thread connection and bit body are fixing can.Described built-up pillar comprises pillar 2, be positioned at supporting carcass 3 on the pillar body, be fixed on the PDC5 on the carcass and run through the water inlet eye 4 of pillar body.The PDC seat 6 that cooperates with PDC is set between PDC 5 and pillar 2.

The manufacture craft of the above-mentioned diamond compact bit that has a built-up pillar is as follows:

Make the PDC bit body with known method earlier, reserve the space of placing built-up pillar 2 at the middle part of described bit body, then the built-up pillar 2 that processes is fixed on the described PDC bit body, PDC 5 is fixed on the supporting carcass 3 of built-up pillar at last.

Built-up pillar is pressed on the bit body with the interference fit method; Perhaps be fixed on the bit body in the mode that is threaded; Perhaps be fixed on the bit body with welding manner.

The manufacture craft of described built-up pillar is as described below:

According to designing requirement processing graphite mould 7 and steel body 8, processing connects the hole 9 of steel body body on steel body 8; The steel body is placed in the graphite jig, and adds covering borax layer 10 on carcass powder material, the binder alloy in hole 9; Die assembly is sent into and is heated to 950 ℃～1200 ℃ and be incubated 10～60 minutes in the agglomerating furnace, comes out of the stove when being cooled to below 850 ℃, moves back mould below 200 ℃; Move back the geometry of processing pillar behind the mould on request and needed size, water inlet eye 4 promptly gets and is with built-up pillar.

Embodiment: the manufacture craft that has the diamond compact bit of built-up pillar.

(1) manufacture craft of built-up pillar: according to design needs processing graphite mould 7 and steel body 8, processing connects two or more hole 9 of steel body body on the steel body; The steel body is assembled in the graphite jig 7, and to the steel body opening 9 that the is positioned at mould carcass material of packing into, as casting W ₂The mixture of C, WC, Co, Ni continues to add binder alloy and cover borax layer 10 in graphite jig 7, and its binder alloy is copper, nickel, manganese alloy; Die assembly is sent in the agglomerating furnace (resistance furnace or induction furnace), be heated to 950 ℃-1200 ℃ and be incubated 10-60 minute, come out of the stove when being cooled to below 850 ℃, move back mould below 200 ℃; On request pillar is processed into needed geometry and size after moving back mould, and creeps into hydrophthalmia 4 on the steel body, built-up pillar completes.

(2) manufacture craft of bit body: can use the bit body that pressure sintering that known pressureless impregnation method, the applicant applied for makes or directly adopt steel body formula bit body.And on the position of bit body fixed combination pillar 2, reserve and place built-up pillar and take up space.

(3) built-up pillar 2 is pressed on the bit body with interference fit; The mode that perhaps is threaded is fixed on the bit body.Perhaps be fixed on the bit body with welding manner.

(4) PDC is welded on the built-up pillar.

The above can make two or more PDC welding carcasses position on built-up pillar by it, is used in to replace two or more as PDC supporter carbide alloy pillar.

Claims

1, the diamond compact bit that has built-up pillar is the PDC Noncoring drill bit, it is characterized in that at the middle part of bit body (1) fixed combination pillar (2).

2, the diamond compact bit that has built-up pillar as claimed in claim 1, it is characterized in that described built-up pillar mainly by pillar (2), be fixed on the supporting carcass (3) on pillar (2) body, the PDC (5) that is fixed on the supporting carcass (3) forms, and also is provided with the water inlet eye (4) that connects the pillar body on pillar (2).

3, the diamond compact bit that has built-up pillar as claimed in claim 2 is characterized in that between PDC (5) and pillar (2) PDC seat (6) being set.

4, as claim 1,2, the 3 described manufacture crafts that have the diamond compact bit of built-up pillar, it is characterized in that: produce PDC bit body (1) with known method earlier, reserve the space of placing built-up pillar (2) at the middle part of described bit body (1), then the built-up pillar (2) that processes is fixed on the described PDC bit body (1), PDC (5) is fixed on the supporting carcass (3) of built-up pillar at last.

5, manufacture craft as claimed in claim 4 is characterized in that built-up pillar (2) is pressed on the PDC bit body (1) with the interference fit method.

6, manufacture craft as claimed in claim 4 is characterized in that built-up pillar (2) is fixed on the PDC bit body (1) in the mode that is threaded.

7, manufacture craft as claimed in claim 4 is characterized in that built-up pillar (2) is fixed on the PDC bit body (1) with welding manner.

8, manufacture craft as claimed in claim 4 is characterized in that the manufacture craft of described built-up pillar (2) is as described below:

1) according to the steel body (8) of designing requirement processing graphite mould (7) and built-up pillar;

2) steel body (8) is placed in the graphite jig (7), and adds carcass powder material, binder alloy in hole (9) and cover borax layer (10);

3) with step 2) in die assembly send into and be heated to 950 ℃～1200 ℃ and be incubated 10～60 minutes in the agglomerating furnace, come out of the stove when being cooled to below 850 ℃, moving back mould below 200 ℃;

4) move back the geometry and the needed size of processing pillar steel body (2) on request behind the mould.