Drilling device with center drill

Abstract

The present invention discloses a drilling device with a center drill, comprising: a drill body, the drill body comprising a fixed section, a cooling section and a drilling section connected in sequence; a coolant flow channel penetrating the fixed section, the cooling section and the drilling section is provided in the drill body; a liquid inlet hole is provided on the cooling section along its radial direction, the liquid inlet hole is connected to the coolant flow channel; the coolant flow channel forms a mounting hole at the end of the drilling section, a center drill is provided in the mounting hole; an adjusting rod is provided in the coolant flow channel, the outer surface of the adjusting rod is provided with an external thread, the adjusting rod is threadedly connected to the inner wall of the coolant flow channel, the end of the adjusting rod is abutted against the end of the center drill; an adjusting slot is provided at the end of the adjusting rod away from the center drill. The present application solves the problem in the related art that standard shallow hole drills are not suitable for drilling sandwich panels, and drilling into the sandwich is particularly prone to damage to the tool, and the workpiece will also be abnormally scrapped.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, in particular to a drilling device with a center drill. Background Art

[0002] Drilling is a basic method of hole processing. During drilling operation, the rotational motion of the drill bit is the main cutting motion. In the existing technology, in order to improve the wear resistance of the drill bit, the drill head is generally made of highly wear-resistant materials (such as diamond or cemented carbide) as a whole.

[0003] Currently, standard shallow hole drills are not suitable for drilling holes in sandwich panels formed by stacking and welding multiple plates. Hitting the interlayer is particularly likely to damage the tool and the workpiece will be abnormally scrapped. Summary of the Invention

[0004] In response to the defects in the existing technology, the present invention provides a drilling device with a center drill to solve the problem that the standard shallow hole drill in the related technology is not suitable for drilling sandwich panels, and it is particularly easy to damage the tool when drilling the sandwich, and the workpiece will also be abnormally scrapped.

[0005] The technical solutions of the present invention are as follows:

[0006] A drilling device with a center drill comprises: a drill body, wherein the drill body comprises a fixing section, a cooling section and a drilling section connected in sequence; wherein,

[0007] A coolant flow channel is provided in the drill body, passing through the fixed section, the cooling section, and the drilling section. The axis of the coolant flow channel is collinear with the axis of the drill body. A liquid inlet hole is provided in the cooling section along its radial direction, and the liquid inlet hole is connected to the coolant flow channel.

[0008] The coolant flow channel forms a mounting hole at the end of the drilling section, a center drill is provided in the mounting hole, and the end of the center drill extends out of the end of the drilling section;

[0009] An adjusting rod is provided in the coolant flow channel, an outer surface of the adjusting rod is provided with an external thread, the adjusting rod is threadedly connected to the inner wall of the coolant flow channel, and an end of the adjusting rod abuts against an end of the center drill;

[0010] A first liquid hole is provided in the adjusting rod along its axial direction, and a second liquid hole is provided in the center drill along its axial direction. The coolant flow channel, the first liquid hole and the second liquid hole are connected; an adjusting groove is provided at one end of the adjusting rod away from the center drill.

[0011] Preferably, the adjusting rod comprises a large diameter portion and a small diameter portion connected in sequence, wherein the large diameter portion and the small diameter portion are coaxial;

[0012] The coolant flow channel is divided into a first flow section matching the large diameter portion and a second flow section matching the small diameter portion, the diameter of the first flow section is larger than the diameter of the second flow section, and the mounting hole is connected to the second flow section;

[0013] The first flow section has an internal thread portion, the external thread is provided on the large diameter portion, and the large diameter portion is threadedly connected to the internal thread portion;

[0014] The adjustment groove is opened at the end of the large diameter portion, the small diameter portion abuts against the end of the center drill, and the first liquid hole passes through the large diameter portion and the small diameter portion.

[0015] Preferably, a conical positioning portion is provided at one end of the small diameter portion close to the center drill, the first liquid hole passes through the positioning portion, and the positioning portion at least partially extends into the second liquid hole.

[0016] Preferably, a first fixing hole and a second fixing hole are provided on the side of the drilling section, the first fixing hole corresponds to the adjusting rod, a rubber pad and a first locking rod are provided in the first fixing hole, an end of the first locking rod abuts against the rubber pad, and the rubber pad abuts against the side of the large-diameter portion;

[0017] The second fixing hole corresponds to the center drill. A second locking rod is provided in the second fixing hole. The second locking rod abuts against a side surface of the center drill.

[0018] Preferably, the cooling section is provided with an external cooling to internal cooling component connected to the liquid inlet hole, and the external cooling to internal cooling component is used to inject coolant into the liquid inlet hole.

[0019] Preferably, the end face of the drilling section is provided with a drilling assembly, and the drilling assembly includes an end face cutting structure and a radial face cutting structure, the end face cutting structure is used to cut the end face of the hole to be processed, and the radial face cutting structure is used to cut the side face of the hole to be processed; the side face of the drilling section is provided with a boring assembly, and the boring assembly is used to cut the side face of the hole to be processed and increase the aperture of the hole to be processed.

[0020] Preferably, the external cooling to internal cooling component includes: a movable ring mounted on the outer wall of the cooling section; a guide nozzle arranged on the movable ring and connected to the liquid inlet hole; and a fixed external cooling structure arranged in contact with the outer wall of the movable ring; wherein a closed liquid storage cavity is formed between the fixed external cooling structure and the outer wall of the movable ring, the fixed external cooling structure is used to inject coolant into the liquid storage cavity, and the guide nozzle is used to guide the coolant inside the liquid storage cavity into the liquid inlet hole.

[0021] Preferably, the fixed external cooling structure includes: a fixed ring wound around the movable ring; a first sealing ring arranged in front of the inner wall of the fixed ring; a second sealing ring arranged behind the inner wall of the fixed ring; and an inlet opened on the fixed ring; wherein the inlet is connected to an infusion tube, the infusion tube is used to inject cooling liquid, the inlet is located between the first sealing ring and the second sealing ring, and the liquid storage chamber is formed between the first sealing ring, the second sealing ring, the inner wall of the fixed ring and the outer wall of the movable ring.

[0022] Preferably, the end face cutting structure comprises: a first mounting groove provided on the end face of the drilling section; and a first cutting bit provided inside the first mounting groove; wherein the cutting edge of the first cutting bit extends out of the end face of the drilling section;

[0023] The radial surface cutting structure includes: a second mounting groove provided on the side of the end surface of the drilling section; and a second cutting bit arranged inside the second mounting groove; wherein the cutting edge of the second cutting bit extends out of the side surface of the drilling section.

[0024] Preferably, the boring assembly includes: a third mounting groove provided on the side of the drilling section; and a cutting tool arranged inside the third mounting groove; wherein the cutting tool includes a third cutting head, and the cutting edge of the third cutting head extends out of the side of the drilling section.

[0025] The beneficial effects of the present invention are embodied in:

[0026] The present invention provides a drill bit body, which includes a fixed section, a cooling section and a drilling section connected in sequence; wherein, a coolant flow channel is provided in the drill bit body and passes through the fixed section, the cooling section and the drilling section, and the axis of the coolant flow channel is colinear with the axis of the drill bit body; a liquid inlet hole is provided in the cooling section along its radial direction, and the liquid inlet hole is connected with the coolant flow channel; the coolant flow channel forms a mounting hole at the end of the drilling section, a center drill is provided in the mounting hole, and the end of the center drill extends out of the end of the drilling section; an adjusting rod is provided in the coolant flow channel, and the outer surface of the adjusting rod is provided with an external thread, the adjusting rod is threadedly connected to the inner wall of the coolant flow channel, and the end of the adjusting rod is butted against the end of the center drill; a through first liquid hole is provided in the adjusting rod along its axial direction, and a through The second liquid hole, the coolant flow channel, the first liquid hole and the second liquid hole are connected; the adjusting rod is provided with an adjusting groove at the end away from the center drill, so that the center drill extending from the end face of the drilling section first connects to the plywood layer. Since the center drill has high hardness and small size, it is easy to directly hit the lower workpiece of the sandwich panel, reducing the area to be cut of the end face cutting structure in the subsequent drilling assembly, thereby reducing the cutting difficulty and wear of the end face cutting structure. At the same time, the installation length of the center drill in the mounting hole can be adjusted by twisting the adjusting rod, that is, the length of the center drill extending from the end face of the drilling section is adjusted, which can adapt to more drilling environments, thereby solving the problem in the related technology that the standard shallow hole drill is not suitable for hitting sandwich panels, and hitting the interlayer is particularly prone to damage the tool, and the workpiece will also be abnormally scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0028] Figure 1 Schematic diagram of the cross-sectional structure of a drill bit body according to one embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the axonometric structure of the drilling device in this embodiment;

[0030] Figure 3 Schematic diagram of the isometric structure of the drill bit body in this embodiment;

[0031] Figure 4 Schematic diagram of the front view of the drill bit body in this embodiment;

[0032] In the accompanying drawings, 1 drill body, 11 fixed section, 12 cooling section, 13 drilling section, 14 coolant flow channel, 141 first flow section, 142 second flow section, 15 mounting hole, 2 center drill, 21 second liquid hole, 3 external cooling to internal cooling assembly, 31 liquid inlet hole, 32 movable ring, 33 guide nozzle, 34 fixed external cooling structure, 341 fixed ring, 3411 positioning threaded hole, 342 first sealing ring, 343 second sealing ring, 344 inlet, 345 Infusion tube, 4 drilling assembly, 41 end face cutting structure, 411 first mounting groove, 412 first cutting head, 42 radial surface cutting structure, 421 second mounting groove, 422 second cutting head, 5 boring assembly, 51 third mounting groove, 52 cutting tool, 521 third cutting head, 6 chip groove, 7 second locking rod, 8 adjusting rod, 81 large diameter portion, 82 small diameter portion, 83 first liquid hole, 84 positioning portion, 9 first locking rod, 10 rubber pad. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0035] In this application, the terms "upper," "lower," "inner," and the like indicate positions or locations based on those shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0036] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] Furthermore, the terms "disposed," "provided with," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] Additionally, the term "plurality" shall mean two or more.

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] like Figures 1 to 4 As shown, this embodiment provides a drilling device with a center drill, comprising: a drill body 1, the drill body 1 comprising a fixing section 11, a cooling section 12 and a drilling section 13 connected in sequence; wherein,

[0041] A coolant flow channel 14 is defined within the drill body 1, passing through the fixed section 11, the cooling section 12, and the drilling section 13. The axis of the coolant flow channel 14 is collinear with the axis of the drill body 1. A liquid inlet hole 31 is defined radially on the cooling section 12, communicating with the coolant flow channel 14.

[0042] The coolant flow channel 14 forms a mounting hole 15 at the end of the drilling section 13. The center drill 2 is arranged in the mounting hole 15. The end of the center drill 2 extends out of the end of the drilling section 13.

[0043] An adjusting rod 8 is provided in the coolant flow channel 14. The outer surface of the adjusting rod 8 is provided with an external thread. The adjusting rod 8 is threadedly connected to the inner wall of the coolant flow channel 14. The end of the adjusting rod 8 abuts against the end of the center drill 2.

[0044] A first liquid hole 83 is provided in the adjusting rod 8 along its axial direction, and a second liquid hole 21 is provided in the center drill 2 along its axial direction. The coolant flow channel 14, the first liquid hole 83 and the second liquid hole 21 are connected; an adjusting groove is provided at the end of the adjusting rod 8 away from the center drill 2.

[0045] In this embodiment, the fixed section 11 is used to be clamped by a fixture, and after clamping the fixed section 11, the fixture can be driven to rotate the drill body 1 on a fixed axis to achieve drilling. The coolant flow channel 14 that passes through the fixed section 11, the cooling section 12 and the drilling section 13 is used for the flow of coolant, thereby cooling the drill body 1. The center drill 2 is installed at the end of the drilling section 13. Since the end of the center drill 2 extends out of the end of the drilling section 13, when drilling, the center drill 2 first contacts the sandwich panel. Since the center drill 2 has high hardness and small size, it is easy to directly hit the lower workpiece of the sandwich panel, reducing the area to be cut by the end face cutting structure 41 in the subsequent drilling assembly 4, thereby reducing the cutting difficulty and wear of the end face cutting structure 41.

[0046] To facilitate adjustment of the length of the center drill 2 extending beyond the end of the drilling section 13, this embodiment includes an adjusting rod 8 disposed within the coolant channel 14. The adjusting rod 8 is hollow and has a first liquid passage hole 83. The center drill 2 has a second liquid passage hole 21. During the drilling process, coolant flows from the liquid inlet hole 31 into the coolant channel 14, then passes through the first liquid passage hole 83 and the second liquid passage hole 21 before exiting the head of the center drill 2. The adjusting rod 8 in this embodiment functions to adjust the installation position of the center drill 2 within the mounting hole 15. Therefore, in this embodiment, the adjusting rod 8 is threadedly connected to the coolant channel 14, with the end of the adjusting rod 8 abutting against the center drill 2. The axial position of the adjusting rod 8 within the coolant channel 14 can be adjusted by rotating the adjusting rod 8. When the adjusting rod 8 moves toward the end of the drilling section 13, the length of the center drill 2 extending beyond the drilling section 13 increases. When the adjusting rod 8 moves toward the cooling section 12, the length of the center drill 2 extending beyond the drilling section 13 decreases.

[0047] Since the position of the adjusting rod 8 is adjusted by rotating itself, an adjustment slot is provided at the end of the adjusting rod 8 to facilitate rotation of the adjusting rod 8. A dedicated tool is inserted from the fixed section 11 into the coolant flow channel 14 and docked with the adjustment slot. The adjusting rod 8 can then be rotated by rotating the dedicated tool, thereby adjusting the axial position of the adjusting rod 8 and, in turn, adjusting the extension length of the center drill 2. In this embodiment, the adjustment slot can be configured as a cross slot, i.e., adjustment slots are provided on all four sides of the end surface of the adjusting rod 8, and the end of the dedicated tool is a cross-shaped plug connector.

[0048] Since the adjusting rod 8 needs to have external threads on its outer surface and a first liquid passage hole 83 formed inside the adjusting rod 8, the diameter of the adjusting rod 8 must not be too small to ensure the required overall structural strength of the adjusting rod 8 after the threads are formed, and the threaded portion must have a certain wall thickness. Furthermore, the adjusting rod 8 needs to be installed within the coolant flow channel 14. An overly thick adjusting rod 8 will also result in an excessively large diameter of the coolant flow channel 14, affecting the structural strength of the entire drill body 1.

[0049] To this end, in this embodiment, the adjustment rod 8 includes a large diameter portion 81 and a small diameter portion 82 connected in sequence, and the large diameter portion 81 and the small diameter portion 82 are coaxial;

[0050] The coolant flow channel 14 is divided into a first flow section 141 that matches the large diameter portion 81 and a second flow section 142 that matches the small diameter portion 82. The diameter of the first flow section 141 is larger than the diameter of the second flow section 142. The mounting hole 15 is connected to the second flow section 142.

[0051] The first flow section 141 has an internal thread portion, and an external thread is provided on the large diameter portion 81, and the large diameter portion 81 is threadedly connected to the internal thread portion;

[0052] The adjustment groove is formed at the end of the large diameter portion 81 , the small diameter portion 82 abuts against the end of the center drill 2 , and the first liquid passage hole 83 passes through the large diameter portion 81 and the small diameter portion 82 .

[0053] Specifically, it should be noted that in this embodiment, the larger diameter portion 81 is used to provide the external thread, and the smaller diameter portion 82 is used to abut against the center drill 2. This not only meets the structural strength requirements of the adjustment rod 8, but also reduces the impact on the strength of the drilling section 13. In this embodiment, the diameter of the smaller diameter portion 82 can be slightly smaller than the diameter of the center drill 2.

[0054] In order to facilitate the coaxiality of the adjusting rod 8 and the center drill 2, a conical positioning portion 84 is provided at one end of the small diameter portion 82 close to the center drill 2 in this embodiment. The first liquid hole 83 passes through the positioning portion 84, and the positioning portion 84 at least partially extends into the second liquid hole 21. The positioning portion 84 keeps the adjusting rod 8 and the center drill 2 coaxial.

[0055] To facilitate the fixation of the adjusting rod 8 and the center drill 2, this embodiment provides a first fixing hole and a second fixing hole on the side of the drilling section 13. The first fixing hole corresponds to the adjusting rod 8. A rubber pad 10 and a first locking rod 9 are provided in the first fixing hole. The end of the first locking rod 9 abuts against the rubber pad 10, and the rubber pad 10 abuts against the side of the large diameter portion 81.

[0056] The pressure of the first locking rod 9 can be buffered by the rubber pads 10 to prevent the external thread on the adjusting rod 8 from being damaged due to excessive pressure. At the same time, the rubber pads 10 can also increase the friction with the adjusting rod 8 and improve drilling stability.

[0057] The second fixing hole corresponds to the center drill 2. A second locking rod 7 is disposed within the second fixing hole and abuts against the side of the center drill 2. The second locking rod 7 secures the center drill 2 within the mounting hole 15. To further prevent the center drill 2 from rotating, a locking surface can be provided on one or both sides of the center drill 2, with the end of the second locking rod 7 abutting against the locking surface.

[0058] To facilitate the flow of coolant, Figures 1 to 3 As shown, in this embodiment, the cooling section 12 is provided with an external-to-internal cooling assembly 3 connected to a liquid inlet 31. The external-to-internal cooling assembly 3 is used to inject coolant into the liquid inlet 31. Preferably, the external-to-internal cooling assembly 3 includes: a movable collar 32 mounted on the outer wall of the cooling section 12; a guide nozzle 33 disposed on the movable collar 32 and connected to the liquid inlet 31; and a fixed external cooling structure 34 disposed in contact with the outer wall of the movable collar 32. A closed liquid storage cavity is formed between the fixed external cooling structure 34 and the outer wall of the movable collar 32. The fixed external cooling structure 34 is used to inject coolant into the liquid storage cavity, and the guide nozzle 33 is used to guide the coolant in the liquid storage cavity into the liquid inlet 31.

[0059] The movable collar 32 is connected to the entire cooling section 12 through the guide nozzle 33. When the drill body 1 starts to rotate circumferentially, the movable collar 32 also rotates with the cooling section 12; further, the fixed external cooling structure 34 is arranged in contact with the movable collar 32, thereby preventing the fixed external cooling structure 34 from moving with the drill body, thereby ensuring the reliability of the fixed external cooling structure 34 in introducing coolant; further, the coolant passes through the fixed external cooling structure 34, the liquid storage chamber, the guide nozzle 33 and the liquid inlet hole 31 in sequence, and finally enters the coolant flow channel 14. By utilizing the transition of the movable collar 32, the inflow speed of the coolant can be increased, and the sealing performance of the liquid storage chamber can be improved at the same time.

[0060] Preferably, the fixed external cooling structure 34 includes: a fixed ring 341 wound around the movable ring 32; a first sealing ring 342 arranged in front of the inner wall of the fixed ring 341; a second sealing ring 343 arranged behind the inner wall of the fixed ring 341; and an inlet 344 opened on the fixed ring 341; wherein the inlet 344 is connected to an infusion tube 345, the infusion tube 345 is used to inject cooling liquid, the inlet 344 is located between the first sealing ring 342 and the second sealing ring 343, and a liquid storage cavity is formed between the first sealing ring 342, the second sealing ring 343, the inner wall of the fixed ring 341 and the outer wall of the movable ring 32.

[0061] The first sealing ring 342 and the second sealing ring 343 are both movable seals. A liquid storage chamber is formed between the first sealing ring 342, the second sealing ring 343, the inner wall of the fixed ring 341 and the outer wall of the movable ring 32, so that the relative rotation between the movable ring 32 and the fixed ring 341 can be achieved, and the liquid storage chamber can be reliably sealed, ensuring that the coolant can be continuously injected into the drill body during the rotation process.

[0062] A positioning threaded hole 3411 is provided on the outer wall of the fixing ring 341 . The positioning threaded hole 3411 is used for inserting a fixing screw into the inner portion to limit the circumferential rotation of the fixing ring 341 .

[0063] In this embodiment, it should be noted that a fixing screw is passed through the positioning threaded hole 3411 , and the fixing screw is positioned by a limiting device, thereby preventing the entire fixing ring 341 from rotating circumferentially.

[0064] Preferably, the end face of the drilling section 13 is provided with a drilling assembly 4, which includes an end face cutting structure 41 and a radial face cutting structure 42. The end face cutting structure 41 is used to cut the end face of the hole to be processed, and the radial face cutting structure 42 is used to cut the side face of the hole to be processed; a boring assembly 5 is provided on the side face of the drilling section 13, which is used to cut the side face of the hole to be processed and increase the aperture of the hole to be processed.

[0065] In this embodiment, after the drilling assembly 4 is combined with the design of the center drill 2, the center drill 2 contacts and drills the sandwich panel first, so that the end face cutting structure 41, the radial face cutting structure 42 and the boring assembly 5 can be reliably guided and reliably supported, greatly improving the structural strength of the drilling device during the processing process, while greatly improving the cutting stability and accuracy.

[0066] Furthermore, through the cooperation of the end face cutting structure 41 and the radial face cutting structure 42, a hole can be opened smoothly on the plane, that is, the rough processing of the hole of the workpiece is performed, and then the boring component 5 is used to fine-process the processed hole. Two processing steps are completed through one feeding action, thereby greatly improving the processing efficiency and smoothly solving problems such as the tolerance requirements of the hole.

[0067] The end face cutting structure 41 includes: a first mounting groove 411 provided on the end face of the drilling section 13; and a first cutting bit 412 disposed within the first mounting groove 411; wherein the cutting edge of the first cutting bit 412 extends beyond the end face of the drilling section 13;

[0068] The radial cutting structure 42 includes a second mounting groove 421 formed on the side of the end face of the drilling section 13 and a second cutting bit 422 disposed inside the second mounting groove 421 . The cutting edge of the second cutting bit 422 extends out of the side face of the drilling section 13 .

[0069] In this embodiment, it should be noted that the first cutting bit 412 extending from the end face of the drilling section 13 is capable of directly cutting the workpiece surface and forming the end face of the hole to be machined. At the same time, it is necessary to ensure that the distance between the cutting edge of the first cutting bit 412 and the end face of the drilling section 13 is less than the distance between the drill bit of the center drill 2 and the end face of the drilling section 13, so that the first cutting bit 412 is always in optimal machining conditions. It should be noted that the second cutting bit 422 extending from the side face of the drilling section 13 is capable of directly cutting the workpiece surface and forming the side face of the hole to be machined, that is, forming a hole to be machined with a predetermined aperture.

[0070] In this embodiment, it should be noted that when the end face size is too large, using only the first cutting head 412 for cutting will cause excessive wear, so the second cutting head 422 is needed to assist the cutting operation and improve the cutting effect and cutting efficiency.

[0071] The boring assembly 5 includes: a third mounting groove 51 provided on the side of the drilling section 13; and a cutting tool 52 disposed inside the third mounting groove 51; wherein the cutting tool 52 includes a third cutting head 521, and the cutting edge of the third cutting head 521 extends out of the side of the drilling section 13.

[0072] In this embodiment, it should be noted that, similarly, according to the tolerance size, the third cutting bit 521 extending from the side of the drilling section 13 can further cut the side wall of the hole to be processed to increase the diameter of the hole to be processed.

[0073] Specifically, a chip removal groove 6 is provided on the drilling section 13 , and the drilling assembly 4 and the boring assembly 5 are both arranged in the chip removal groove 6 .

[0074] In this embodiment, it should be noted that the drilling assembly 4 and the boring assembly 5 are both arranged in the chip groove 6. During the cutting process, on the one hand, the processing waste formed by the drilling assembly 4 and the boring assembly 5 can be quickly discharged, effectively improving the cutting process effect. On the other hand, the coolant can move in the chip groove 6, fully driving the waste, and at the same time fully cooling the drilling assembly 4 and the boring assembly 5.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A drilling device with a center drill, characterized in that: include: The drill bit body comprises a fixing section, a cooling section and a drilling section connected in sequence; wherein, A coolant flow channel is provided in the drill body, passing through the fixed section, the cooling section, and the drilling section. The axis of the coolant flow channel is collinear with the axis of the drill body. A liquid inlet hole is provided in the cooling section along its radial direction, and the liquid inlet hole is connected to the coolant flow channel. The coolant flow channel forms a mounting hole at the end of the drilling section, a center drill is provided in the mounting hole, and the end of the center drill extends out of the end of the drilling section; An adjusting rod is provided in the coolant flow channel, an outer surface of the adjusting rod is provided with an external thread, the adjusting rod is threadedly connected to the inner wall of the coolant flow channel, and an end of the adjusting rod abuts against an end of the center drill; A first liquid hole is formed in the adjusting rod along its axial direction, and a second liquid hole is formed in the center drill along its axial direction. The coolant flow channel, the first liquid hole and the second liquid hole are connected. An adjusting groove is formed at one end of the adjusting rod away from the center drill. The adjusting rod includes a large diameter portion and a small diameter portion connected in sequence, and the large diameter portion and the small diameter portion are coaxial; The coolant flow channel is divided into a first flow section matching the large diameter portion and a second flow section matching the small diameter portion, the diameter of the first flow section is larger than the diameter of the second flow section, and the mounting hole is connected to the second flow section; The first flow section has an internal thread portion, the external thread is provided on the large diameter portion, and the large diameter portion is threadedly connected to the internal thread portion; The adjusting groove is formed at the end of the large diameter portion, the small diameter portion abuts against the end of the center drill, and the first liquid hole passes through the large diameter portion and the small diameter portion; A conical positioning portion is provided at one end of the small diameter portion close to the center drill, the first liquid hole passes through the positioning portion, and the positioning portion at least partially extends into the second liquid hole; The cooling section is provided with an external cooling to internal cooling component connected to the liquid inlet hole, and the external cooling to internal cooling component is used to inject coolant into the liquid inlet hole.

2. The drilling device with a center drill according to claim 1, characterized in that A first fixing hole and a second fixing hole are provided on the side of the drilling section, the first fixing hole corresponds to the adjusting rod, a rubber pad and a first locking rod are provided in the first fixing hole, an end of the first locking rod abuts against the rubber pad, and the rubber pad abuts against the side of the large-diameter portion; The second fixing hole corresponds to the center drill. A second locking rod is provided in the second fixing hole. The second locking rod abuts against a side surface of the center drill.

3. The drilling device with a center drill according to claim 1, characterized in that The end face of the drilling section is provided with a drilling assembly, which includes an end face cutting structure and a radial face cutting structure. The end face cutting structure is used to cut the end face of the hole to be processed, and the radial face cutting structure is used to cut the side face of the hole to be processed; a boring assembly is provided on the side face of the drilling section, which is used to cut the side face of the hole to be processed and increase the diameter of the hole to be processed.

4. The drilling device with a center drill according to claim 3, characterized in that The external cooling to internal cooling component includes: a movable ring mounted on the outer wall of the cooling section; a guide nozzle arranged on the movable ring and connected to the liquid inlet; and a fixed external cooling structure arranged in contact with the outer wall of the movable ring; wherein a closed liquid storage cavity is formed between the fixed external cooling structure and the outer wall of the movable ring, the fixed external cooling structure is used to inject coolant into the liquid storage cavity, and the guide nozzle is used to guide the coolant inside the liquid storage cavity into the liquid inlet.

5. The drilling device with a center drill according to claim 4, characterized in that The fixed external cooling structure includes: a fixed ring wound around the movable ring; a first sealing ring arranged in front of the inner wall of the fixed ring; a second sealing ring arranged behind the inner wall of the fixed ring; and an inlet opened on the fixed ring; wherein the inlet is connected to an infusion tube, the infusion tube is used to inject cooling liquid, the inlet is located between the first sealing ring and the second sealing ring, and the liquid storage cavity is formed between the first sealing ring, the second sealing ring, the inner wall of the fixed ring and the outer wall of the movable ring.

6. The drilling device with a center drill according to claim 5, characterized in that The end face cutting structure includes: a first mounting groove provided on the end face of the drilling section; and a first cutting bit provided inside the first mounting groove; wherein the cutting edge of the first cutting bit extends out of the end face of the drilling section; The radial surface cutting structure includes: a second mounting groove provided on the side of the end surface of the drilling section; and a second cutting bit arranged inside the second mounting groove; wherein the cutting edge of the second cutting bit extends out of the side surface of the drilling section.

7. The drilling device with a center drill according to claim 6, characterized in that The boring assembly includes: a third mounting groove provided on the side of the drilling section; and a cutting tool arranged inside the third mounting groove; wherein the cutting tool includes a third cutting head, and the cutting edge of the third cutting head extends out of the side of the drilling section.

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