Control structure for hardened layer of steel drill bit

Abstract

The utility model discloses a hardened layer control structure of a steel body drill bit. The hardened layer control structure comprises a plurality of hardened layer structure extension arms matched with drill bit blades on the side face of the crown of the steel body drill bit. A plurality of holes are formed in the surface of the hardened layer structure extension arm, and the holes are matched with PDC cutting teeth and gauge protection top face teeth of drill bit blades of the steel body drill bit; the hardened layer control structure is arranged on the steel body drill bit and drives the hardened material to be fixed to the steel body drill bit through welding cladding. The width and the depth of a drill bit hardening area are preset through software, and compared with manual experience judgment at the present stage, a formed hardening layer control structure overcomes the defects that a hardening layer is different in thickness, uneven and incoherent in hardening area.

Description

Technical Field

[0001] The utility model relates to the technical field of bits for oil drilling, in particular to a control structure for the hardened layer of a steel body bit. Background Art

[0002] With the continuous progress of numerical control machining technology, especially the development of five-axis linkage machining technology, a precise and efficient machining method is provided for steel body PDC bits. As a key equipment for machining steel body PDC bits, a numerical control five-axis machining center solves the production problems of machining the steel body of PDC bits. The steel body PDC bit product has a short manufacturing cycle, which is conducive to carrying out personalized PDC bit design and manufacturing. It has high overall strength, higher downhole safety, stronger ability to penetrate interlayers, does not require graphite molds and sintering materials, is conducive to controlling the cost of a single bit, has high machining accuracy, can ensure the consistency between the finished bit and the design concept, has a good anti-caking effect, and has greater superiority in manufacturing large-sized bits. At present, steel body bits are widely used in oil fields at home and abroad, and their market share exceeds 90%.

[0003] After the steel body bit is numerically controlled five-axis machined, surface hardening needs to be carried out on specific areas of the bit surface, and surfacing or spray welding processes are used to improve the surface erosion resistance of the steel body bit. Usually, the width and depth of the hardened area are often determined by the experience of welders, which often results in defects such as uneven hardened layer thickness, unevenness, and discontinuity of the hardened area, affecting the appearance of the hardened layer and even the quality of the hardened layer.

[0004] Therefore, based on the above technical problems, those skilled in the art urgently need to develop a control structure for the hardened layer of a steel body bit. Content of the Utility Model

[0005] The purpose of the utility model is to provide a control structure for the hardened layer of a steel body bit. This application pre-sets the width and depth of the hardened area of the steel body bit by using software to form a control structure for the hardened layer. When numerically controlling the machining of the bit crown, this control structure is machined and completed. This structure has a great promoting effect on the accuracy and convenient operation of bit hardening in the same industry.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A control structure for the hardened layer of a steel body bit of the utility model, the control structure for the hardened layer is arranged on the crown of the steel body bit, and the control structure for the hardened layer includes:

[0008] A plurality of hardened layer structure extension arms that match the bit blades on the side of the crown of the steel body bit;

[0009] The surface of the extension arm of the hardened layer structure is provided with a plurality of holes, and the holes match the PDC cutting teeth and the gauge top surface teeth of the drill blade of the steel body drill bit;

[0010] The hardened layer control structure is arranged on the steel body drill bit, and is welded and clad to drive the hardened material to be fixed on the steel body drill bit.

[0011] Furthermore, the hardened layer structure extension arm includes:

[0012] a first extension arm assembly structure; and

[0013] two second extension arms;

[0014] The first extension arm assembly structure has three first extension arms connected to each other as a whole, and the first extension arm assembly structure matches the three corresponding drill blades of the crown of the steel drill bit;

[0015] The two second extension arms are symmetrically arranged and matched with the other two corresponding drill blades on the crown of the steel body drill.

[0016] Furthermore, the center of the first extension arm assembly structure is the connection portion of the three first extension arms, and the connection portion is recessed downward to form a structure that matches the center of the crown;

[0017] The first extension arm cooperates with the corresponding drill blade to bend and extend sideways and is attached to the surface of the drill blade;

[0018] A cutting tooth matching hole is formed at the upper portion of the first extension arm, and a diameter-protecting top surface tooth matching hole is formed at the lower portion of the first extension arm;

[0019] When the first extension arm is arranged on the drill blade, the PDC cutting teeth of the drill blade are located in the corresponding cutting tooth matching holes, and the working ends of some of the PDC cutting teeth extend to the outside of the cutting tooth matching holes.

[0020] Furthermore, a cutting tooth matching hole is provided at the upper portion of the second extension arm, and a diameter-protecting top surface tooth matching hole is provided at the lower portion of the second extension arm;

[0021] When the second extension arm is arranged on the drill blade, the PDC cutting teeth of the drill blade are located in the corresponding cutting tooth matching holes, and the working ends of some of the PDC cutting teeth extend to the outside of the cutting tooth matching holes.

[0022] Further, the drill blade matched with the second extension arm is configured as an independent blade, and the drill blade matched with the first extension arm is configured as a conjoined blade;

[0023] A certain space is reserved between the independent cutter blade and the connected cutter blade.

[0024] Furthermore, inclined surfaces are provided at the lower ends and the circumferences of the first extension arm and the second extension arm, and the inclined surfaces are matched with the side surfaces and the lower end surfaces of the corresponding drill bit cutter blades.

[0025] In the above technical solution, a steel body drill bit hardening layer control structure provided by the present utility model has the following beneficial effects:

[0026] By presetting the width and depth of the hardening area of the drill bit through software, the formed hardening layer control structure solves the defects of inconsistent hardening layer thickness, unevenness, and discontinuous hardening areas compared with the current manual experience judgment.

[0027] The hardening layer control structure of the present utility model solves the problem of difficult post - grinding, which affects the aesthetics and quality of the hardening layer. The hardening layer control structure is completely designed according to the different widths and depths of the hardening areas of each part of the drill bit cutter blade, and ensures that the hardening material for cladding fills the control structure evenly and smoothly during welding, further ensuring the quality and aesthetics of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0029] Figure 1 It is a schematic diagram of the matching structure of a steel body drill bit hardening layer control structure provided by an embodiment of the present application arranged on a steel body drill bit;

[0030] Figure 2 It is a schematic diagram of the structure of a steel body drill bit hardening layer control structure provided by an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the structure of the first extension arm assembly structure of a steel body drill bit hardening layer control structure provided by an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the structure of the second extension arm of a steel body drill bit hardening layer control structure provided by an embodiment of the present application.

[0033] DESCRIPTION OF THE REFERENCE NUMERALS:

[0034] 10. Steel body drill bit; 20. Hardening layer control structure;

[0035] 11. Crown; 12. Integral cutter blade; 13. Independent cutter blade; 14. PDC cutting tooth; 15. Gauge top tooth;

[0036] 1. First extension arm; 2. Second extension arm;

[0037] 301. Cutting tooth mating hole; 302. Gauge top tooth mating hole. Detailed implementation mode

[0038] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further introduced in detail below in conjunction with the accompanying drawings.

[0039] See Figures 1 to 4 as shown;

[0040] This embodiment discloses a hardening layer control structure for a steel body drill bit. The hardening layer control structure 20 is arranged on the crown 11 of the steel body drill bit 10. The hardening layer control structure 20 includes:

[0041] Multiple hardening layer structure extension arms that match the drill bit blades on the side of the crown 11 of the steel body drill bit 10;

[0042] The surface of the hardening layer structure extension arm is provided with multiple holes, and the holes match the PDC cutting teeth 14 and gauge top teeth 15 of the drill bit blades of the steel body drill bit;

[0043] The hardening layer control structure 20 is arranged on the steel body drill bit 10 and is fixed on the steel body drill bit 10 by welding and cladding to drive the hardening material.

[0044] Specifically, this embodiment discloses a hardening layer control structure 20 for a steel body drill bit. Before the numerical control machining programming of the steel body drill bit 10 in this embodiment, software is used to preset the width and depth of the hardening area of the steel body drill bit 10 to form the hardening layer control structure 20. When the crown 11 of the numerical control machining drill bit is processed, the hardening layer control structure 20 is processed. During welding, the cladding hardening material fills the control structure evenly and smoothly. In order to ensure the coherence and integrity of the hardening layer thickness and hardening area of the steel body drill bit and improve the accuracy of the welder's operation, before numerical control programming, this method is used to process the three-dimensional model of the drill bit, and the hardening area is constructed according to the model structure to form a complete hardening layer control structure 20. Finally, the numerical control machining model is obtained through Boolean operation, and the machining area is controlled through numerical control programming in the follow-up to ensure the smooth implementation of the hardening process.

[0045] Preferably, this embodiment further defines the specific structure of the hardening layer control structure 20. Among them, the hardening layer structure extension arm of this embodiment includes a first extension arm assembly structure; and two second extension arms 2;

[0046] The first extension arm assembly structure has three first extension arms 1 connected to each other as a whole, and the first extension arm assembly structure matches with three corresponding drill blades of the crown 11 of the steel body drill bit 10;

[0047] The two second extension arms 2 are symmetrically arranged and matched with the other two corresponding drill blades of the crown 11 of the steel body drill bit 10 .

[0048] More specifically, the center of the first extension arm assembly structure of this embodiment is the connection portion of the three first extension arms 1, and the connection portion is recessed downward to form a structure that matches the center of the crown 11;

[0049] The first extension arm 1 cooperates with the corresponding drill blade to bend and extend sideways and is attached to the surface of the drill blade;

[0050] A cutting tooth matching hole 301 is formed at the upper portion of the first extension arm 1, and a diameter-protecting top surface tooth matching hole 302 is formed at the lower portion of the first extension arm 1;

[0051] When the first extension arm 1 is disposed on the drill blade, the PDC cutting teeth 14 of the drill blade are located in the corresponding cutting tooth matching holes 301 , and the working ends of some PDC cutting teeth 14 extend to the outside of the cutting tooth matching holes 301 .

[0052] First, in this embodiment, the drill blade that cooperates with the second extension arm 2 is configured as an independent blade wing 13, and the drill blade that cooperates with the first extension arm 1 is configured as a connected blade wing 12; according to the structural characteristics of the steel body drill bit 10, a certain space is reserved between the independent blade wing 13 and the connected blade wing 12 of this embodiment.

[0053] Secondly, according to the number and position characteristics of the above-mentioned combined blade wing 12 and independent blade wing 13, this embodiment designs a first extension arm assembly structure and two second extension arms 2; wherein the first extension arm assembly structure is divided into three first extension arms 1, which respectively correspond to the three blade wing parts of the combined blade wing 12, and each second extension arm 2 corresponds to an independent blade wing 13;

[0054] In addition, in this embodiment, a cutting tooth matching hole 301 is formed at the upper portion of the second extension arm 2, and a diameter-protecting top surface tooth matching hole 302 is formed at the lower portion of the second extension arm 2;

[0055] When the second extension arm 2 is disposed on the drill blade, the PDC cutting teeth 14 of the drill blade are located in the corresponding cutting tooth matching holes 301 , and the working ends of some PDC cutting teeth 14 extend to the outside of the cutting tooth matching holes 301 .

[0056] In this embodiment, in order to cooperate with the PDC cutting teeth 14 and the gauge top teeth 15 of the blade, the number and the setting positions of the PDC cutting teeth 14 are arranged along the extending trajectory of the blade. According to the changes in the positions, numbers, and inclination angles of the PDC cutting teeth 14, the first extension arm 1 and the second extension arm 2 are both provided with corresponding cutting tooth mating holes 301. At the same time, according to the positions and numbers of the gauge top teeth 15, gauge top tooth mating holes 302 also need to be provided.

[0057] Preferably, the lower ends and the circumferences of the first extension arm 1 and the second extension arm 2 of this embodiment are both provided with inclined surfaces, and the inclined surfaces are matched with the side surfaces and the lower end surfaces of the corresponding drill blade.

[0058] In the above technical solution, a steel body drill bit hardening layer control structure provided by the present utility model has the following beneficial effects:

[0059] By presetting the width and depth of the hardening area of the drill bit through software, the hardening layer control structure formed by the present utility model solves the defects of inconsistent hardening layer thickness, unevenness, and discontinuous hardening areas compared with the current manual experience judgment.

[0060] The hardening layer control structure of the present utility model solves the problem of difficult post-grinding, which affects the aesthetics and quality of the hardening layer. The hardening layer control structure is completely designed according to the different widths and depths of the hardening areas of each part of the drill blade, and ensures that the cladding hardening material fills the control structure evenly and smoothly during welding, further ensuring the quality and aesthetics of the drill bit.

[0061] Only some exemplary embodiments of the present utility model are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. A steel drill bit hardening layer control structure, characterized in that: The hardened layer control structure (20) is arranged on the crown (11) of the steel body drill bit (10), and the hardened layer control structure (20) comprises: A plurality of hardened layer structure extension arms matching the drill blades on the side of the crown (11) of the steel body drill bit (10); The surface of the extension arm of the hardened layer structure is provided with a plurality of holes, and the holes match the PDC cutting teeth (14) and the gauge top surface teeth (15) of the drill blade of the steel body drill bit; The hardened layer control structure (20) is arranged on the steel body drill bit (10) and is welded and clad to drive the hardened material to be fixed on the steel body drill bit (10); The hardened layer structure extension arm comprises: a first extension arm assembly structure; and two second extension arms (2); The first extension arm assembly structure comprises three first extension arms (1) connected to each other as a whole, and the first extension arm assembly structure matches three corresponding drill blades of the crown (11) of the steel body drill bit (10); The two second extension arms (2) are symmetrically arranged and matched with the other two corresponding drill blades of the crown (11) of the steel body drill bit (10).

2. A steel drill bit hardening layer control structure according to claim 1, characterized in that: The center of the first extension arm assembly structure is the connecting portion of the three first extension arms (1), and the connecting portion is recessed downward to form a structure that matches the center of the crown (11); The first extension arm (1) cooperates with the corresponding drill blade to bend and extend sideways and is attached to the surface of the drill blade; A cutting tooth matching hole (301) is formed on the upper portion of the first extension arm (1), and a diameter-protecting top surface tooth matching hole (302) is formed on the lower portion of the first extension arm (1); When the first extension arm (1) is arranged on the drill blade, the PDC cutting tooth (14) of the drill blade is located in the corresponding cutting tooth matching hole (301), and the working end of part of the PDC cutting tooth (14) extends to the outside of the cutting tooth matching hole (301).

3. A steel drill bit hardening layer control structure according to claim 1, characterized in that: A cutting tooth matching hole (301) is formed on the upper portion of the second extension arm (2), and a diameter-protecting top surface tooth matching hole (302) is formed on the lower portion of the second extension arm (2); When the second extension arm (2) is arranged on the drill blade, the PDC cutting tooth (14) of the drill blade is located in the corresponding cutting tooth matching hole (301), and the working end of part of the PDC cutting tooth (14) extends to the outside of the cutting tooth matching hole (301).

4. A steel drill bit hardening layer control structure according to claim 3, characterized in that: The drill blade matched with the second extension arm (2) is configured as an independent blade (13), and the drill blade matched with the first extension arm (1) is configured as a connected blade (12); A certain space is reserved between the independent blade wing (13) and the integrated blade wing (12).

5. A steel drill bit hardening layer control structure according to claim 1, characterized in that: The lower ends and circumferential sides of the first extension arm (1) and the second extension arm (2) are both provided with inclined surfaces, and the inclined surfaces match the side surfaces and lower end surfaces of the corresponding drill blades.

Images