Continuous operation equipment for drilling tool thread machining and thread surface local quenching

Abstract

The invention discloses drilling tool thread machining and thread surface local quenching continuous operation equipment in the technical field of quenching. The drilling tool thread machining and thread surface local quenching continuous operation equipment comprises a pipe thread machining lathe, a laser device, a clamping and fixing device and a motion control device. A workpiece clamping chuck and a lathe tray are installed on the pipe thread machining lathe, the lathe tray is in sliding connection with the pipe thread machining lathe, and a drilling tool is transversely clamped on the workpiece clamping chuck. According to the method, a laser mode is adopted, local surface quenching is only carried out on the slope surface parts of the guide surface and the bearing surface of the drilling tool thread, and a wear-resistant layer with certain thickness and hardness is formed at the engaged contact part of threaded connection, so that the service life of the drilling tool thread is prolonged, and meanwhile, the service life of the drilling tool thread is prolonged. According to the equipment, thread machining and surface local quenching are continuously carried out, the quenching efficiency and the positioning precision of the thread quenching surface are remarkably improved, and the surface quenching quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of quenching, in particular to equipment for continuous operation of drilling tool thread processing and local quenching of thread surface. Background Art

[0002] Drilling tools are essential tools in the exploration and development of resources such as oil and natural gas. During the drilling process, multiple drill tools of a certain length (about 9.6 meters) need to be assembled in series using threaded connections to form a pipe string of hundreds or even thousands of meters. During the drilling operation, the pipe string needs to be pulled out and put into the wellbore multiple times. Therefore, the individual drill tools in the pipe string need to be threaded and made and broken out multiple times, that is, connected and disassembled. As a result, the threads will be worn, the thread tooth thickness will be reduced, and eventually the threads will fail.

[0003] To increase the service life of threaded connections and reduce the rate of thread thickness reduction, the currently used technology is to perform comprehensive phosphating or copper plating on the threads of drill tools. This involves placing the entire threaded area in a phosphating bath or electroplating solution to chemically generate a wear-resistant phosphating layer or copper on the thread surface. However, phosphating or copper plating produces waste liquid containing a large amount of hazardous substances. The waste liquid contains heavy metals such as chromium, nickel, zinc, and copper. Direct discharge of the waste liquid will pollute water, soil, and air, causing long-term harm to the environment and organisms. Therefore, a quenching method that is superior to phosphating or copper plating is urgently needed to meet production needs.

[0004] At the same time, in the patent with publication number CN116732286A, a thread laser quenching method, device, equipment and medium are proposed, including: obtaining the initial hardness value and target hardness value of the threaded workpiece to be quenched and determining the thread starting point of the threaded workpiece to be quenched. The thread laser quenching method provided by the present invention is used to make the hardness of the thread surface of the threaded workpiece change in a gradient manner to avoid the occurrence of chipping.

[0005] However, during the drilling operation, since the bottom of the drill tool thread has to bear complex and variable loads, fatigue cracking of the thread tooth bottom is an important reason for the failure of the threaded connection. The above technical solution is used to quench the entire thread, which will result in the formation of a hard and brittle quenching layer (martensite structure) of a certain thickness at the bottom of the thread tooth. The existence of this quenching layer will lead to the risk of rapid initiation of cracks at the bottom of the thread tooth, which directly affects the safety and service life of the drill tool thread connection. Therefore, it is not suitable for surface quenching treatment of the drill tool thread. Summary of the Invention

[0006] In view of the problems existing in the above-mentioned existing equipment for continuous operation of drilling tool thread processing and local quenching of thread surface, the present invention proposes a equipment for continuous operation of drilling tool thread processing and local quenching of thread surface to solve such problems.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a continuous operation equipment for drilling tool thread processing and thread surface local quenching, comprising: a pipe thread processing lathe, a laser device, a clamping device and a motion control device;

[0008] The pipe thread processing lathe is equipped with a workpiece clamping chuck and a lathe pallet, and the lathe pallet and the pipe thread processing lathe are in a sliding connection relationship, and the workpiece clamping chuck is laterally clamped with a drilling tool;

[0009] The laser device includes a laser head and a control system, and the control system adjusts the shape, size and energy of the light spot emitted by the laser head. At the same time, an optical cable is connected between the laser head and the control system;

[0010] The clamping and fixing device securely connects the laser head to the lathe pallet;

[0011] The motion control device is fixedly mounted on the side of a lathe pallet, on which a thread processing tool is mounted. The motion control device positions the thread processing tool and the laser head at the same reference point and performs linkage control on the motion trajectories of the two.

[0012] As a preferred solution of the continuous operation equipment for drill tool thread processing and thread surface local quenching described in the present invention, the pipe thread processing lathe includes a lathe base, two sets of lathe guide rails located above the lathe base, and a lathe pallet slidably connected thereto, a lathe screw laterally arranged between the lathe base and the lathe guide rails, a lathe tailstock arranged on one side of the lathe base, and a tool mounting frame installed on the lathe pallet, and the thread processing tool is installed on the tool mounting frame.

[0013] As a preferred solution of the continuous operation equipment for drill tool thread processing and thread surface local quenching described in the present invention, the tool mounting frame and the clamping and fixing device are respectively assembled and fixed on both sides of the lathe pallet, and the thread processing tools and laser heads correspondingly installed on the tool mounting frame and the clamping and fixing device are similarly distributed on both sides of the lathe pallet.

[0014] As an optimal solution for the continuous operation equipment of drill tool thread processing and thread surface local quenching described in the present invention, wherein: the drill tool is processed with a drill tool thread by a thread processing tool, and the drill tool thread includes a thread tooth top, a thread tooth bottom, a thread guide surface bevel and a thread bearing surface bevel, and the thread guide surface bevel and the thread bearing surface bevel are opposite to each other.

[0015] As an optimal solution for the continuous operation equipment of drill tool thread processing and thread surface local quenching according to the present invention, the thickness of the quenched layer after quenching the inclined surface of the thread guide surface is 20-30um, and the hardness of the quenched layer is HV0.1600-700; the thickness of the quenched layer after quenching the inclined surface of the thread bearing surface is 30-40um, and the hardness of the quenched layer is HV0.1650-750.

[0016] As a preferred solution of the continuous operation equipment for drilling tool thread machining and thread surface local quenching of the present invention, the positioning references of the thread machining tool and the laser head are both the mid-diameter of the drilling tool thread to be machined.

[0017] As a preferred solution for the continuous operation equipment of drill tool thread processing and local quenching of thread surface according to the present invention, the thread processing tool and the laser head are both located on the side of the drill tool, the laser head does not interfere with the drill tool in the parallel direction, and the laser head can perform local quenching of the drill tool thread surface immediately following the last thread processing stroke of the thread processing tool.

[0018] As a preferred solution for the continuous operation equipment for drill tool thread processing and local quenching of thread surface according to the present invention, the laser head emits a light beam that intersects with the drill tool thread, the light spot of the light beam is rectangular, and the length of the light beam is less than or equal to the smaller of the length of the thread guide surface inclined surface and the thread bearing surface inclined surface, and the light beam is vertically incident on either the thread guide surface inclined surface or the thread bearing surface inclined surface.

[0019] As a preferred solution for the continuous operation equipment of drill thread processing and thread surface local quenching described in the present invention, the laser head can selectively emit two light beams at the same time, and the two light beams respectively quench the inclined surface of the thread guide surface and the inclined surface of the thread bearing surface simultaneously.

[0020] In order to solve the above technical problems, the present invention also provides the following technical solution: a continuous operation workflow of drilling tool thread processing and thread surface local quenching, comprising the following steps:

[0021] S1, the pipe thread processing lathe clamps the drill tool to be processed by the workpiece holding chuck;

[0022] S2. Set the size, energy and incident angle of the laser beam according to the size of the thread to be processed;

[0023] S3, the pipe threading lathe performs thread processing on the drill tool using the thread processing tool fixed on the lathe pallet;

[0024] S4. After the drill thread is processed on the drill, the thread processing tool is recovered, and the laser head performs local quenching on the inclined surface of the thread guide surface of the drill thread;

[0025] S5. After the local quenching of the inclined surface of the thread guide surface is completed, the incident angle of the light beam emitted by the laser head is adjusted to perform local quenching on the inclined surface of the thread bearing surface;

[0026] S6. After the surface quenching of the entire drill thread is completed, the pipe thread processing lathe is stopped and the drill thread quenching is completed is removed;

[0027] S7. Replace the new drill tool to be processed and repeat the above operation to achieve continuous operation of drill tool thread processing and local quenching of thread surface.

[0028] The beneficial effects of the present invention are as follows: by using a laser method, only the sloped surface of the guide surface and the bearing surface of the drill thread is locally surface quenched, thereby avoiding surface quenching of the entire tooth profile; the laser head of the laser is set and fixed on the pallet of the pipe thread processing lathe, so that the same reference positioning and motion trajectory of the thread processing tool and the laser head can be easily achieved, ensuring the precise positioning of the light spot emitted by the laser head on the guide surface and the bearing surface of the thread tooth; at the same time, by combining the laser with the pipe thread processing lathe, the continuous operation of the thread from processing to surface quenching is effectively realized; the processing and surface treatment of the thread adopt one-time clamping, which can realize the automated process control of industrial production, significantly improve the efficiency of surface quenching of the production thread, save production costs, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive efforts. Among them:

[0030] Figure 1 It is a schematic diagram of the overall structure of the equipment for continuous operation of drilling tool thread processing and thread surface local quenching according to the present invention.

[0031] Figure 2 This is a front view of the equipment for continuous operation of drilling tool thread processing and thread surface local quenching according to the present invention.

[0032] Figure 3 This is a schematic diagram of the dual-beam emission state of the laser head of the continuous operation equipment for drill thread processing and thread surface local quenching of the present invention.

[0033] Figure 4 It is a schematic diagram of the thread tooth profile of a drill tool equipped with continuous operation equipment for thread machining and local quenching of the thread surface of the drill tool according to the present invention.

[0034] Figure 5This is a schematic diagram of the engagement state of the drill thread of the equipment for continuous operation of drill thread processing and local quenching of the thread surface of the drill tool according to the present invention.

[0035] Figure 6 This is a schematic diagram of the light beam irradiation angle of the continuous operation equipment for drilling tool thread processing and local quenching of thread surface of the present invention.

[0036] Figure numerals: 1. Pipe thread processing lathe; 11. Lathe base; 12. Lathe guide rail; 13. Lathe pallet; 14. Lathe screw; 15. Workpiece clamping chuck; 16. Lathe tailstock; 17. Tool mounting bracket; 18. Thread processing tool; 2. Laser device; 21. Control system; 22. Laser head; 23. Optical cable; 24. Light beam; 3. Clamping and fixing device; 4. Motion control device; 5. Drill tool; 51. Drill tool thread; 511. Thread tooth top; 512. Thread tooth bottom; 513. Thread guide surface inclined surface; 514. Thread bearing surface inclined surface. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Example 1

[0040] Reference Figures 1 to 6 , which is the first embodiment of the present invention, includes a continuous operation equipment for drilling tool thread processing and thread surface local quenching, including: a pipe thread processing lathe 1, a laser device 2, a clamping device 3 and a motion control device 4;

[0041] A workpiece clamping chuck 15 and a lathe pallet 13 are installed on the pipe threading lathe 1, and the lathe pallet 13 and the pipe threading lathe 1 are in a sliding connection relationship. The workpiece clamping chuck 15 horizontally clamps the drilling tool 5;

[0042] The laser device 2 includes a laser head 22 and a control system 21. The control system 21 adjusts the shape, size, and energy of the light spot emitted by the laser head 22. An optical cable 23 is connected between the laser head 22 and the control system 21. The control system 21 adjusts the shape, size, and energy of the light spot of the light beam 24 emitted by the laser head 22 through signal transmission through the optical cable 23.

[0043] The clamping fixture 3 securely connects the laser head 22 to the lathe tray 13;

[0044] The motion control device 4 is fixedly mounted on the side of the lathe pallet 13 , on which a thread machining tool 18 is mounted. The motion control device 4 positions the thread machining tool 18 and the laser head 22 at the same reference point and controls their motion trajectories in a linkage manner.

[0045] Among them, reference Figure 1 and Figure 2 The pipe thread processing lathe 1 includes a lathe base 11, two sets of lathe guide rails 12 located above the lathe base 11, and a lathe pallet 13 slidably connected to 12, a lathe screw 14 arranged horizontally between the lathe base 11 and the lathe guide rails 12, a lathe tailstock 16 arranged on one side of the lathe base 11, and a tool mounting bracket 17 mounted on the lathe pallet 13, and a thread processing tool 18 is mounted on the tool mounting bracket 17. The pipe thread processing lathe 1 is a mature application mechanical product processing machine tool, mainly used for thread processing of cylindrical workpieces, such as Q1332 pipe thread lathe.

[0046] Further, refer to Figure 1 The tool mounting bracket 17 and the clamping fixture 3 are respectively assembled and fixed on both sides of the lathe pallet 13, and the thread processing tool 18 and the laser head 22 correspondingly installed on the tool mounting bracket 17 and the clamping fixture 3 are similarly distributed on both sides of the lathe pallet 13; since the tool mounting bracket 17 and the clamping fixture 3 are respectively fixed on both sides of the lathe pallet 13, through the movement of the lathe pallet 13, the motion control device 4 can control the thread processing tool 18 and the laser head 22 to move synchronously on two parallel lathe rails 12, thereby realizing the positioning of the thread processing tool 18 and the laser head 22 at the same reference point.

[0047] Reference Figure 4 The drill tool 5 is processed with a drill tool thread 51 by a thread processing tool 18. The drill tool thread 51 includes a thread tooth top 511, a thread tooth bottom 512, a thread guide surface inclined surface 513 and a thread bearing surface inclined surface 514, and the thread guide surface inclined surface 513 and the thread bearing surface inclined surface 514 are opposite to each other.

[0048] Furthermore, the quenched layer thickness of the thread guide surface inclined surface 513 after quenching is 20-30 μm, and the quenched layer hardness is HV0.1600-700. The quenched layer thickness of the thread bearing surface inclined surface 514 after quenching is 30-40 μm, and the quenched layer hardness is HV0.1650-750.

[0049] Reference Figure 2 The positioning references of the thread machining tool 18 and the laser head 22 are both the mid-diameter of the drill thread 51 to be machined.

[0050] Reference Figure 1Both the thread machining tool 18 and the laser head 22 are located on the side of the drill 5. The laser head 22 does not interfere with the drill 5 in the parallel direction. The laser head 22 can perform local quenching on the surface of the drill thread 51 following the last thread machining stroke of the thread machining tool 18.

[0051] Reference Figure 6 The laser head 22 emits a light beam 24 that intersects with the drill thread 51. The light spot of the light beam 24 is rectangular, and the length of the light beam 24 is less than or equal to the smaller of the lengths of the thread guide surface inclined surface 513 and the thread bearing surface inclined surface 514. At the same time, the light beam 24 is vertically incident on either the thread guide surface inclined surface 513 or the thread bearing surface inclined surface 514.

[0052] Further, refer to Figure 5 When the drill thread 51 is engaged, the thread tooth bottom 512 of one thread does not contact the thread tooth top 511 of the other thread, and the thread guide surface inclined surface 513 and the thread bearing surface inclined surface 514 are in contact with the thread guide surface inclined surface 513 and the thread bearing surface inclined surface 514 of the other thread.

[0053] Reference Figure 6 The laser head 22 can selectively emit two light beams 24 at the same time, and the two light beams 24 respectively quench the thread guide surface inclined surface 513 and the thread bearing surface inclined surface 514 simultaneously.

[0054] Example 2

[0055] Reference Figures 1 to 6 , which is the second embodiment of the present invention, differs from the first embodiment in that it proposes a continuous operation workflow for drilling tool thread processing and thread surface local quenching, including the following steps:

[0056] S1, the pipe thread processing lathe 1 clamps and fixes the drill tool 5 to be processed by the workpiece holding chuck 15;

[0057] S2. Setting the size, energy and incident angle of the light beam 24 emitted by the laser head 22 according to the size of the thread to be processed;

[0058] S3, the pipe threading lathe 1 performs thread processing on the drill 5 by using the thread processing tool 18 fixed on the lathe pallet 13;

[0059] S4. After the drilling tool thread 51 is machined on the drilling tool 5, the thread machining tool 18 is recovered, and the laser head 22 performs local quenching on the thread guide surface bevel 513 of the drilling tool thread 51;

[0060] S5. After the local quenching of the thread guide surface bevel 513 is completed, the incident angle of the light beam 24 emitted by the laser head 22 is adjusted to locally quench the thread bearing surface bevel 514;

[0061] S6. After the surface quenching of the entire drill thread 51 is completed, the pipe thread processing lathe 1 is stopped, and the drill 5 after the thread quenching is completed is removed;

[0062] S7. Replace the new drill 51 to be processed with a new thread, and repeat the above operation to achieve continuous operation of thread processing of the drill 51 and local quenching of the thread surface.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A continuous operation equipment for drilling tool thread processing and thread surface local quenching, characterized in that: include: A pipe thread processing lathe (1), a laser device (2), a clamping device (3) and a motion control device (4); A workpiece clamping chuck (15) and a lathe pallet (13) are installed on the pipe thread processing lathe (1), and the lathe pallet (13) and the pipe thread processing lathe (1) are in a sliding connection relationship, and a drilling tool (5) is horizontally clamped on the workpiece clamping chuck (15); The laser device (2) includes a laser head (22) and a control system (21), wherein the control system (21) adjusts the shape, size and energy of the light spot emitted by the laser head (22), and an optical cable (23) is connected between the laser head (22) and the control system (21); The clamping and fixing device (3) securely connects the laser head (22) to the lathe tray (13); The motion control device (4) is fixedly mounted on the side of a lathe tray (13), a thread processing tool (18) is mounted on the lathe tray (13), and the motion control device (4) positions the thread processing tool (18) and the laser head (22) at the same reference point and performs linkage control on the motion trajectories of the two.

2. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 1 is characterized in that: The pipe thread processing lathe (1) comprises a lathe base (11), two sets of lathe guide rails (12) located above the lathe base (11), a lathe tray (13) slidably connected to the (12), a lathe screw (14) transversely arranged between the lathe base (11) and the lathe guide rails (12), a lathe tailstock (16) arranged on one side of the lathe base (11), and a tool mounting frame (17) mounted on the lathe tray (13), and a thread processing tool (18) is mounted on the tool mounting frame (17).

3. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 2, characterized in that: The tool mounting frame (17) and the clamping fixture (3) are respectively assembled and fixed on both sides of the lathe tray (13), and the thread processing tool (18) and the laser head (22) correspondingly mounted on the tool mounting frame (17) and the clamping fixture (3) are similarly distributed on both sides of the lathe tray (13).

4. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 3 is characterized by: The drill tool (5) is machined with a drill tool thread (51) by a thread machining tool (18), and the drill tool thread (51) includes a thread tooth top (511), a thread tooth bottom (512), a thread guide surface inclined surface (513) and a thread bearing surface inclined surface (514), and the thread guide surface inclined surface (513) and the thread bearing surface inclined surface (514) are opposite to each other.

5. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 4 is characterized in that: The thread guide surface inclined surface (513) has a quenching layer thickness of 20-30 μm after quenching, and a quenching layer hardness of HV0.1600-700; the thread bearing surface inclined surface (514) has a quenching layer thickness of 30-40 μm after quenching, and a quenching layer hardness of HV0.1650-750.

6. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 4, characterized in that: The positioning references of the thread processing tool (18) and the laser head (22) are both the median diameter of the drill thread (51) to be processed.

7. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 6, characterized in that: The thread machining tool (18) and the laser head (22) are both located on the side of the drill tool (5). The laser head (22) does not interfere with the drill tool (5) in a parallel direction. The laser head (22) can perform local quenching on the surface of the drill tool thread (51) immediately following the last thread machining stroke of the thread machining tool (18).

8. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 7, characterized in that: The laser head (22) emits a light beam (24) that intersects with the drill thread (51). The light spot of the light beam (24) is rectangular, and the length of the light beam (24) is less than or equal to the smaller of the lengths of the thread guide surface inclined surface (513) and the thread bearing surface inclined surface (514). At the same time, the light beam (24) is vertically incident on either the thread guide surface inclined surface (513) or the thread bearing surface inclined surface (514).

9. The continuous operation equipment for drilling tool thread processing and thread surface local quenching according to claim 8, characterized in that: The laser head (22) can selectively emit two light beams (24) simultaneously, and the two light beams (24) respectively quench the thread guide surface inclined surface (513) and the thread bearing surface inclined surface (514) simultaneously.

10. A workflow of the continuous operation equipment for drilling tool thread processing and thread surface local quenching according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, a pipe thread processing lathe (1) clamps and fixes a drill tool (5) to be processed with a thread through a workpiece clamping chuck (15); S2, setting the size, energy and incident angle of the light beam (24) emitted by the laser head (22) according to the size of the thread to be processed; S3, the pipe threading lathe (1) performs thread processing on the drill tool (5) through the thread processing tool (18) fixed on the lathe tray (13); S4. After the drilling tool thread (51) is processed on the drilling tool (5), the thread processing tool (18) is recovered, and the laser head (22) performs local quenching on the thread guide surface bevel (513) of the drilling tool thread (51); S5. After the local quenching of the thread guide surface inclined surface (513) is completed, the incident angle of the light beam (24) emitted by the laser head (22) is adjusted to perform local quenching on the thread bearing surface inclined surface (514); S6. After the surface quenching of the entire drill thread (51) is completed, the pipe thread processing lathe (1) is stopped, and the drill (5) after the thread quenching is completed is removed; S7, replace the new drill (51) to be processed with the thread, repeat the above operation, and the continuous operation of the thread processing of the drill (51) and the local quenching of the thread surface can be achieved.

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