Combined turning tool for machining special thread couplings with fixed holder

Abstract

A combined turning tool for machining special threaded couplings using a fixed tool post, relating to the field of machine tool processing technology, includes a tool post with a sliding guide rail. An upper tool holder and a lower tool holder are slidably connected to the sliding guide rail, and the upper and lower tool holders are respectively equipped with a boring tool and a compound threading tool. The boring tool includes a boring bar and a boring head, with two cutting inserts fixedly mounted at the front end of the boring head, and an arc-shaped notch between the two cutting inserts. The arc-shaped notch is located at the front end of the boring head. The compound threading tool includes a compound tool bar and a compound tool head, with a pointed insert and a square insert fixedly mounted on the front end face of the compound tool head, and a threading insert fixedly mounted on the side surface of the compound tool head near the square insert. An upper notch and a lower notch are respectively located on the upper and lower sides of the compound tool head. This invention overcomes the shortcomings of the prior art, significantly improving machining accuracy and ease of operation, reducing tool changes, and further shortening the overall machining time.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and in particular to machine tool processing technology, specifically a combination lathe tool for processing special threaded couplings using a fixed tool post. Background Technology

[0002] Oil casing coupling material is the pipe used to manufacture oil casing couplings. Each well requires several layers of casing depending on the drilling depth and geological conditions. The production and processing of oil casing couplings involves five major processes: cutting, polishing, boring, threading, and marking.

[0003] In the boring and special thread machining of oil casing couplings, multiple single-function cutting tools are typically used for step-by-step cutting. Threads, sealing surfaces, end faces, and boring holes all require separate single-function cutting tools (such as ISO standard SNMG / CNMG inserts), necessitating tool disassembly and replacement for each process. This results in low machining efficiency, and frequent tool changes can lead to unstable machining accuracy. Furthermore, in existing technologies, to reduce tool change time, electric rotary tool holders are commonly used. However, electric rotary tool holders are complex, have high procurement and maintenance costs, and are prone to failure under high loads, causing production interruptions. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a combined turning tool for machining special threaded couplings using a fixed tool post. This overcomes the deficiencies of existing technologies, significantly improves machining accuracy and ease of operation, reduces the number of tool changes, and further shortens the overall machining time.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A combined turning tool for machining special threaded couplings using a fixed tool post includes a tool post, on which a sliding guide rail is fixedly mounted. An upper tool holder and a lower tool holder are slidably connected to the sliding guide rail. A boring tool and a compound thread turning tool are fixedly mounted on the upper tool holder and the lower tool holder, respectively.

[0007] The boring tool includes a boring bar and a boring head. The boring bar is fixedly installed in the upper tool holder, and the boring head is fixedly disposed at the front end of the boring bar. Two cutting blades are fixedly installed at the front end of the boring head. The two cutting blades are symmetrically arranged about the center line of the boring head, and an arc-shaped notch is provided between the two cutting blades. The arc-shaped notch is formed at the front end of the boring head.

[0008] The composite threading tool includes a composite tool holder and a composite tool head. The composite tool holder is fixedly installed in the lower tool holder, and the composite tool head is fixedly disposed at the front end of the composite tool holder. A pointed insert and a square insert are fixedly installed on the front end face of the composite tool head, and a threading insert is fixedly installed on the side surface of the composite tool head near the square insert. An upper notch and a lower notch are respectively opened on the upper and lower sides of the composite tool head. The pointed insert is located in the upper notch, and the square insert and the threading insert are located in the lower notch.

[0009] Preferably, the boring tool has a first cooling channel inside, the boring tool bar has a first water inlet at the rear end, and the arc-shaped notch has two first water outlets. The first water inlet is connected to the two first water outlets through the first cooling channel, and the spray direction of the two first water outlets corresponds to the two cutting blades respectively.

[0010] Preferably, the composite threading tool has a second cooling channel inside, a second water inlet is provided at the rear end of the composite tool holder, a pointed blade water outlet is provided in the upper notch, and a square blade water outlet and a threading blade water outlet are provided in the lower notch. The second water inlet is connected to the pointed blade water outlet, the square blade water outlet and the threading blade water outlet respectively through the second cooling channel. The spray direction of the pointed blade water outlet corresponds to the pointed blade, and the spray directions of the square blade water outlet and the threading blade water outlet correspond to the square blade and the threading blade respectively.

[0011] This invention provides a combined turning tool for machining special threaded couplings using a fixed tool post. It offers the following advantages: By setting cutting inserts on both sides of the boring head's front end, rough boring and finish boring of the coupling's inner hole can be completed simultaneously using two cutting inserts, thus greatly improving machining efficiency. Furthermore, by setting pointed inserts, square inserts, and thread inserts on the composite tool head, multi-functional operations such as end-face turning, thread machining, and tapered sealing surface turning are achieved on the same tool head, significantly improving machining accuracy and operational convenience, reducing tool changes, and further shortening the overall machining time. In addition, the composite tool head design effectively avoids error accumulation during machining, thereby improving machining quality. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0013] Figure 1 A schematic diagram of the installation structure of this utility model;

[0014] Figure 2 Schematic diagram of the boring tool in this utility model Figure 1 ;

[0015] Figure 3 Schematic diagram of the boring tool in this utility model Figure 2 ;

[0016] Figure 4 A schematic diagram of the composite thread cutting tool in this utility model;

[0017] Explanation of the labels in the diagram:

[0018] 1. Tool holder; 2. Sliding guide rail; 3. Upper tool holder; 4. Lower tool holder; 5. Boring tool; 6. Compound threading tool; 51. Boring tool holder; 52. Boring tool head; 53. Cutting insert; 54. Arc-shaped notch; 55. First cooling channel; 56. First water inlet; 57. First water outlet; 61. Compound tool holder; 62. Compound tool head; 63. Pointed insert; 64. Square insert; 65. Threading insert; 66. Upper notch; 67. Lower notch; 68. Second cooling channel; 69. Second water inlet; 610. Pointed insert water outlet; 611. Square insert water outlet; 612. Threading insert water outlet. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1, as Figures 1 to 4 As shown, a combined turning tool for machining special threaded couplings using a fixed tool post includes a tool post 1, which is slidably connected to a turning tool machine via a lead screw sliding module. A sliding guide rail 2 is fixedly mounted on the tool post 1, and an upper tool holder 3 and a lower tool holder 4 are slidably connected to the sliding guide rail 2. A boring tool 5 is fixedly mounted on the upper tool holder 3, and a composite thread turning tool 6 is fixedly mounted on the lower tool holder 4. The length direction of the sliding guide rail 2 is perpendicular to the movement direction of the lead screw sliding module.

[0021] The boring tool 5 includes a boring tool holder 51 and a boring tool head 52. The boring tool holder 51 is fixedly installed in the upper tool holder 3. The boring tool head 52 is fixedly installed at the front end of the boring tool holder 51. Two cutting inserts 53 are fixedly installed at the front end of the boring tool head 52. The two cutting inserts 53 are symmetrically arranged about the center line of the boring tool head 52. An arc-shaped notch 54 is provided between the two cutting inserts 53. The arc-shaped notch 54 is opened at the front end of the boring tool head 52.

[0022] The composite threading tool 6 includes a composite tool holder 61 and a composite tool head 62. The composite tool holder 61 is fixedly installed in the lower tool holder 4, and the composite tool head 62 is fixedly installed at the front end of the composite tool holder 61. A pointed insert 63 and a square insert 64 are fixedly installed on the front end face of the composite tool head 62, and a threading insert 65 is fixedly installed on the side surface of the composite tool head 62 near the square insert 64. An upper notch 66 and a lower notch 67 are respectively opened on the upper and lower sides of the composite tool head 62. The pointed insert 63 is located in the upper notch 66, and the square insert 64 and the threading insert 65 are located in the lower notch 67.

[0023] In this embodiment, the positions of the boring tool 5 and the composite thread cutting tool 6 can also be interchanged to adapt to different processing requirements and ensure flexibility and efficiency.

[0024] The lead screw sliding module and its connection method with the lathe tool are both well-known solutions in the prior art.

[0025] Working principle:

[0026] In use, the oil casing coupling is first clamped and fixed by the chuck on the lathe tool. Then, the position of the tool holder 1 is adjusted by the lead screw sliding module so that the boring tool 5 is aligned with the coupling for boring. During the boring process, the cutting blade 53 on the left side of the front end of the boring tool holder 51 can be used for radial feed to complete the initial boring. Then, the cutting blade 53 on the right side of the front end is used for further fine boring to effectively ensure the hole diameter accuracy.

[0027] Then, the lead screw sliding module is controlled to move the tool holder 1, aligning the compound thread cutting tool 6 with the coupling for thread machining. During thread machining, the square insert 64 is first controlled to perform radial feed to flatten the end face of the coupling. Then, the lower tool holder 4 is controlled to move along the length of the sliding guide rail 2, causing the thread insert 65 to gradually cut into the coupling surface. The thread insert 65 can then be used for axial feed at a 30° lead angle to achieve tapered thread machining. Finally, the lower tool holder 4 is controlled to move in the opposite direction along the length of the sliding guide rail 2, causing the thread insert 65 to gradually retract from the coupling surface. Then, by controlling the lead screw sliding module to move the tool holder 1 away from the oil casing coupling, and then controlling the lower tool holder 4 to move along the length direction of the sliding guide rail 2, so that the pointed blade 63 corresponds to the root of the tapered thread of the coupling. Then, by controlling the lead screw sliding module to move the tool holder 1 towards the oil casing coupling, and by controlling the lower tool holder 4 to make a fine adjustment along the length direction of the sliding guide rail 2, so that the pointed blade 63 fits against the root of the tapered thread of the coupling. Through the radial feed of the pointed blade 63, a 60° tapered sealing surface is machined on the root of the tapered thread.

[0028] In this invention, by setting cutting inserts 53 on both sides of the front end of the boring head 52, the rough boring and fine boring of the inner hole of the mating collar can be completed simultaneously by the two cutting inserts 53, thereby greatly improving the machining efficiency. Furthermore, by setting pointed inserts 63, square inserts 64, and thread inserts 65 on the composite head 62, multi-functional operations such as end face turning, thread machining, and conical sealing surface turning are achieved on the same head, significantly improving machining accuracy and ease of operation, reducing the number of tool changes, and further shortening the overall machining time. In addition, the design of the composite head 62 effectively avoids the accumulation of errors during the machining process, thereby improving the machining quality.

[0029] In Example 2, as a further preferred embodiment of Example 1, the boring tool 5 is provided with a first cooling channel 55 inside, the boring tool bar 51 has a first water inlet 56 at its rear end, and the arc notch 54 has two first water outlets 57 respectively. The first water inlet 56 is connected to the two first water outlets 57 through the first cooling channel 55, and the spray direction of the two first water outlets 57 corresponds to the two cutting blades 53 respectively.

[0030] Therefore, when boring is performed by the boring tool 5, the coolant can flow in from the first inlet 56 and then be delivered to the two first outlets 57 through the first cooling channel 55. The coolant is then sprayed onto the cutting parts of the two cutting blades 53 through the two first outlets 57 to form effective cooling and lubrication, reduce blade wear and thermal deformation, ensure boring accuracy and surface finish, and thus effectively extend the service life of the boring tool 5.

[0031] In Example 3, as a further preferred embodiment of Example 1, the composite threading tool 6 has a second cooling channel 68 inside, a second water inlet 69 is provided at the rear end of the composite tool holder 61, a pointed blade water outlet 610 is provided in the upper notch 66, and a square blade water outlet 611 and a threading blade water outlet 612 are provided in the lower notch 67. The second water inlet 69 is connected to the pointed blade water outlet 610, the square blade water outlet 611 and the threading blade water outlet 612 respectively through the second cooling channel 68. The spray direction of the pointed blade water outlet 610 corresponds to the pointed blade 63, and the spray directions of the square blade water outlet 611 and the threading blade water outlet 612 correspond to the square blade 64 and the threading blade 65 respectively.

[0032] Therefore, when machining with the composite thread cutting tool 6, the coolant can flow in from the second inlet 69 and be delivered to the tip insert outlet 610, the square insert outlet 611 and the thread insert outlet 612 through the second cooling channel 68, and then be precisely sprayed onto the cutting part of the corresponding insert to effectively improve the cooling effect, ensure that each insert maintains stable performance during high-efficiency machining, and thus extend the service life of the composite thread cutting tool 6.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combination turning tool for machining special threaded couplings using a fixed tool post, characterized in that: Includes a tool holder (1), on which a sliding guide rail (2) is fixedly installed, and an upper tool holder (3) and a lower tool holder (4) are slidably connected on the sliding guide rail (2), and a boring tool (5) and a compound thread turning tool (6) are fixedly installed on the upper tool holder (3) and the lower tool holder (4), respectively. The boring tool (5) includes a boring tool shank (51) and a boring tool head (52). The boring tool shank (51) is fixedly installed in the upper tool holder (3). The boring tool head (52) is fixedly installed at the front end of the boring tool shank (51). Two cutting blades (53) are fixedly installed at the front end of the boring tool head (52). The two cutting blades (53) are symmetrically arranged about the center line of the boring tool head (52). An arc-shaped notch (54) is provided between the two cutting blades (53). The arc-shaped notch (54) is opened at the front end of the boring tool head (52). The composite threading tool (6) includes a composite tool holder (61) and a composite tool head (62). The composite tool holder (61) is fixedly installed in the lower tool holder (4). The composite tool head (62) is fixedly installed at the front end of the composite tool holder (61). A pointed blade (63) and a square blade (64) are fixedly installed on the front end face of the composite tool head (62). A threading blade (65) is fixedly installed on the side surface of the composite tool head (62) near the square blade (64). An upper notch (66) and a lower notch (67) are opened on the upper and lower sides of the composite tool head (62). The pointed blade (63) is located in the upper notch (66), and the square blade (64) and the threading blade (65) are located in the lower notch (67).

2. A combined turning tool for machining special threaded couplings using a fixed tool post according to claim 1, characterized in that: The boring tool (5) has a first cooling channel (55) inside. The boring tool bar (51) has a first water inlet (56) at its rear end. The arc notch (54) has two first water outlets (57) respectively. The first water inlet (56) is connected to the two first water outlets (57) through the first cooling channel (55). The spray direction of the two first water outlets (57) corresponds to the two cutting blades (53) respectively.

3. A combined turning tool for machining special threaded couplings using a fixed tool post according to claim 1, characterized in that: The composite thread cutting tool (6) has a second cooling channel (68) inside. The composite tool holder (61) has a second water inlet (69) at its rear end. The upper notch (66) has a pointed blade water outlet (610). The lower notch (67) has a square blade water outlet (611) and a threading blade water outlet (612). The second water inlet (69) is connected to the pointed blade water outlet (610), the square blade water outlet (611), and the threading blade water outlet (612) through the second cooling channel (68). The spray direction of the pointed blade water outlet (610) corresponds to the pointed blade (63). The spray directions of the square blade water outlet (611) and the threading blade water outlet (612) correspond to the square blade (64) and the threading blade (65), respectively.

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