Connecting structure of inner chip removal deep hole drill

Abstract

The utility model relates to a deep hole drill connecting structure, in particular to an inner chip removal deep hole drill connecting structure which comprises an installation base installed at one end of a drill rod and a connecting sleeve installed at the end, away from a tool edge, of a drill bit. The connecting sleeve is matched with the mounting base in a sleeving manner; a plurality of groups of fixing plates are mounted on the mounting base, and the fixing plates are equidistantly distributed in the circumferential direction of the mounting base; a connecting piece is arranged between the connecting sleeve and the mounting base, and the connecting piece can limit the displacement of the connecting sleeve; the drill bit and the drill rod are connected through the connecting piece, the connecting strength can be effectively ensured, the matching plate is limited through the limiting plate and the fixing plate, the connecting strength can be effectively improved, the contact area of the connecting position is large, and fatigue damage to the connecting position due to the action of alternating torque and axial force can be avoided; the drill bit can be prevented from falling off in the drilling process of the drill bit, and therefore it is guaranteed that drilling is conducted orderly.

Description

Technical Field

[0001] This utility model relates to a deep hole drill connection structure, specifically a connection structure for an internal chip removal deep hole drill. Background Technology

[0002] Internal chip removal deep hole drills are specialized drilling tools designed for machining deep holes (typically with a length-to-diameter ratio > 10:1). Their key feature is that chips are removed through internal chip removal channels within the drill shank, rather than the external chip removal method of traditional twist drills. This design significantly improves the efficiency and reliability of deep hole machining, especially when machining high-hardness materials or deep holes. Common internal chip removal deep hole drills include BTA drills and gun drills.

[0003] A gun drill is a deep-hole drill with an integrated drill bit and drill rod, suitable for machining small-diameter deep holes; while a BTA drill is a deep-hole drill with an integrated drill bit and drill rod connected by a connecting structure, suitable for machining larger-diameter deep holes. Therefore, BTA drills are often used for machining larger-diameter deep holes.

[0004] Common BTA drill connection structures include threaded grooves on the drill rod and threaded protrusions fixedly mounted on the drill bit that engage with the threaded grooves. Through the threaded engagement, a reliable connection between the drill bit and the drill rod is achieved.

[0005] Because of the sharp transition at the bottom of the thread, fatigue cracks are easily formed under alternating torque and axial force (especially when machining high-hardness materials). This makes the drill rod prone to breakage at the root of the thread. Drill rod breakage during drilling can easily lead to the scrapping of machined parts, which is not conducive to cost control. Summary of the Invention

[0006] The purpose of this invention is to provide a connection structure for an internal chip removal deep hole drill to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A connection structure for an internal chip removal deep hole drill includes a mounting base installed at one end of the drill rod and a connecting sleeve installed at the end of the drill bit away from the cutting edge.

[0009] The connecting sleeve is fitted into the mounting base;

[0010] Multiple sets of fixing plates are installed on the mounting base, and the fixing plates are equidistantly distributed along the circumference of the mounting base.

[0011] A connector is provided between the connecting sleeve and the mounting base, and the connector can limit the displacement of the connecting sleeve.

[0012] The connection structure of the internal chip removal deep hole drill described above is as follows: the connector includes multiple sets of mating plates, which are equidistantly arranged along the circumference of the connecting sleeve and fixedly connected to the inner wall of the connecting sleeve; a sliding groove is provided on the mounting base; multiple sets of limiting plates that mate with the mating plates are provided on the mounting base; a fitting block that slides and engages with the sliding groove is installed on the limiting plate; a spring is sleeved on the mounting base; the two ends of the spring abut against the limiting plate and the mounting base, respectively.

[0013] The connection structure of the internal chip removal deep hole drill as described above: the limiting plate is inclined on the side away from the drill rod; the mating plate is also inclined on the side away from the drill bit.

[0014] The connection structure of the internal chip removal deep hole drill as described above: the connector further includes a protruding post installed on the inner wall of the connecting sleeve; the fixing plate is provided with a locking groove group that slides and engages with the protruding post.

[0015] The connection structure of the internal chip removal deep hole drill as described above: the locking groove group includes a straight groove and an arc groove; wherein, one end of the straight groove passes through the mounting base; the other end is connected to one end of the arc groove; the other end of the arc groove is closed.

[0016] The connection structure of the internal chip removal deep hole drill as described above: a groove is provided in the mounting base; a wedge block that is fixedly connected to the limiting plate is slidably installed in the groove.

[0017] The connection structure of the internal chip removal deep hole drill as described above: the wedge block is inclined on the side near the drill bit.

[0018] Compared with the prior art, the beneficial effects of this utility model are: the connection between the drill bit and the drill rod is effectively ensured by connecting the connector, and the connection strength is effectively improved by limiting the mating plate by the limiting plate and the fixing plate. In addition, the contact area at the connection is large, which can avoid fatigue damage at the connection due to the action of alternating torque and axial force. It can also prevent the drill bit from falling off during the drilling process, thereby ensuring the orderly progress of drilling. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure for an internal chip removal deep hole drill.

[0020] Figure 2 This is a schematic diagram of the connecting sleeve and mounting base in the connection structure of an internal chip removal deep hole drill.

[0021] Figure 3 This is a schematic diagram of the limiting plate in the connection structure of an internal chip removal deep hole drill.

[0022] Figure 4 This is a schematic diagram of the fixing plate in the connection structure of an internal chip removal deep hole drill.

[0023] Figure 5 for Figure 4 A schematic diagram of the structure at point A in the middle.

[0024] In the diagram: 1. Drill pipe;

[0025] 2. Drill bit;

[0026] 3. Connecting sleeve;

[0027] 4. Mounting base; 401. Groove; 402. Slide groove;

[0028] 5. Limiting plate; 501. Fitting block; 502. Wedge block;

[0029] 6. Spring;

[0030] 7. Fixing plate; 701. Straight groove; 702. Arc groove;

[0031] 8. Matching plate;

[0032] 9. Protruding column. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Please see Figures 1-5 As an embodiment of the present utility model, the connecting structure of the internal chip removal deep hole drill includes a mounting base 4 installed at one end of the drill rod 1, and a connecting sleeve 3 installed at the end of the drill bit 2 away from the cutting edge.

[0035] The connecting sleeve 3 is sleeved with the mounting base 4;

[0036] Multiple sets of fixing plates 7 are installed on the mounting base 4, and the fixing plates 7 are equidistantly distributed along the circumference of the mounting base 4.

[0037] A connector is provided between the connecting sleeve 3 and the mounting base 4, and the connector can limit the displacement of the connecting sleeve 3.

[0038] In this embodiment, when in use, the drill bit 2 is inserted into the drill rod 1 along the axial direction of the drill rod 1; during the insertion process, the connecting sleeve 3 will engage with the mounting base 4, and the connecting sleeve 3 is located on the outside.

[0039] Then, the connecting sleeve 3 is limited by the connector, thereby increasing the connection strength between the connecting sleeve 3 and the mounting base 4 and preventing the connecting sleeve 3 from separating from the mounting base 4 during use; and the connector can limit the relative rotation between the connecting sleeve 3 and the mounting base 4, thereby ensuring that when the drive device drives the drill rod 1 to rotate, the drill bit 2 can rotate accordingly, avoiding slippage and thus ensuring the drilling ability of the drill bit 2.

[0040] Connecting drill bit 2 and drill rod 1 with a connector can improve the fatigue resistance of the connection, avoid fatigue damage at the connection point, and thus extend the service life.

[0041] As a further embodiment of this utility model, the connector includes multiple sets of mating plates 8, which are equidistantly arranged along the circumference of the connecting sleeve 3 and fixedly connected to the inner wall of the connecting sleeve 3; the mounting base 4 is provided with a sliding groove 402; the mounting base 4 is provided with multiple sets of limiting plates 5 that mate with the mating plates 8; the limiting plates 5 are equipped with fitting blocks 501 that slide and engage with the sliding groove 402; the mounting base 4 is fitted with a spring 6; the two ends of the spring 6 abut against the limiting plates 5 and the mounting base 4 respectively.

[0042] As a further embodiment of this utility model, the limiting plate 5 is inclined on the side away from the drill rod 1; the mating plate 8 is also inclined on the side away from the drill bit 2.

[0043] In this embodiment, during the process of fitting the connecting sleeve 3 into the mounting base 4, the mating plate 8 will come into contact with the limiting plate 5. After contact, the connection angle of the drill bit 2 will be corrected by the mutual squeezing action of the inclined surfaces of the two, thereby ensuring that the connection process is not obstructed and that the connection is carried out smoothly.

[0044] When the connecting sleeve 3 is fully inserted into the mounting base 4, the contact area between the inclined surfaces of the mating plate 8 and the limiting plate 5 is at its maximum. At this time, the connecting sleeve 3 is rotated, thereby driving the mating plate 8 to rotate. During this process, the inclined surfaces of the mating plate 8 and the limiting plate 5 will press against each other, thereby driving the limiting plate 5 to move away from the drill bit 2, thereby driving the fitting block 501 to slide synchronously in the slide groove 402 and compressing the spring 6. During this process, the contact area between the mating plate 8 and the limiting plate 5 will gradually decrease.

[0045] When the contact area between the mating plate 8 and the limiting plate 5 is zero, the elastic force of the spring 6 will drive the limiting plate 5 to move in the opposite direction to reset. At this time, the two sides of the mating plate 8 will abut against the limiting plate 5 and the fixing plate 7 respectively, so that when the drill rod 1 rotates, it can drive the mating plate 8 to rotate through the limiting plate 5 and the fixing plate 7, thereby driving the drill bit 2 to rotate synchronously.

[0046] Connecting the drill bit 2 and the drill rod 1 with a connector can effectively ensure the connection strength. The limiting plate 5 and the fixing plate 7 limit the mating plate 8, which can effectively improve the connection strength. In addition, the contact area at the connection is large, which can avoid fatigue damage at the connection due to alternating torque and axial force.

[0047] As a further embodiment of this utility model, the connector further includes a protruding post 9 installed on the inner wall of the connecting sleeve 3; the fixing plate 7 is provided with a locking groove group that slides and engages with the protruding post 9.

[0048] As a further embodiment of this utility model, the locking groove assembly includes a straight groove 701 and an arc-shaped groove 702; wherein, one end of the straight groove 701 passes through the mounting base 4; the other end is connected to one end of the arc-shaped groove 702; and the other end of the arc-shaped groove 702 is closed.

[0049] In this embodiment, during the process of fitting the connecting sleeve 3 into the mounting base 4, the protruding post 9 will first enter the straight groove 701, and after entering, it will slide in the straight groove 701 towards the arc groove 702.

[0050] After the connecting sleeve 3 is fully inserted into the mounting base 4, the protruding post 9 is located at the connection between the straight groove 701 and the arc groove 702.

[0051] When the connecting sleeve 3 is rotated so that the mating plate 8, the limiting plate 5, and the fixing plate 7 cooperate with each other, the protruding column 9 will slide away from the straight groove 701 in the arc groove 702.

[0052] When the mating plate 8, the limiting plate 5, and the fixing plate 7 are in contact with each other, the protruding post 9 will be in the arc groove 702. At this time, the limiting effect of the arc groove 702 on the protruding post 9 makes it more difficult to separate the connecting sleeve 3 from the mounting base 4.

[0053] During the drilling process of drill bit 2, the resistance of drill bit 2 is directly transmitted to drill rod 1 through connecting sleeve 3. Therefore, the increase in compressive force between protruding column 9 and arc groove 702 is not high. As a result, protruding column 9 will not be deformed by force and the connection strength will not be reduced.

[0054] Connecting drill bit 2 and drill rod 1 with a connector effectively ensures connection strength and prevents drill bit 2 from falling off during drilling, thus ensuring orderly drilling. Connecting drill bit 2 and drill rod 1 with a connector effectively ensures connection strength, and limiting plate 5 and fixing plate 7 limit the mating plate 8, which effectively improves connection strength. In addition, the large contact area at the connection point can prevent fatigue damage at the connection point due to alternating torque and axial force.

[0055] As a further embodiment of this utility model, the mounting base 4 has a groove 401; a wedge 502 that is fixedly connected to the limiting plate 5 is slidably installed in the groove 401.

[0056] As a further embodiment of this invention, the wedge block 502 is inclined on the side closest to the drill bit 2.

[0057] In this embodiment, after use, an external force is applied to the wedge 502 through the chip removal hole of the drill bit 2 using a tool, thereby causing multiple sets of wedges 502 to move synchronously away from the drill bit 2 in the slot 401; thereby driving multiple sets of limiting plates 5 to move synchronously, so that the surfaces of the limiting plates 5 that abut against the mating plates 8 are disengaged from the mating plates 8.

[0058] At this time, the connecting sleeve 3 is rotated in the opposite direction to drive the mating plate 8 to rotate synchronously, so that the mating plate 8 and the inclined surface of the limiting plate 5 abut against each other; and during this process, the protruding column 9 will slide in the arc groove 702 to the connection point with the straight groove 701.

[0059] Then an external force is applied to separate the connecting sleeve 3 from the mounting base 4. During this process, the protruding post 9 will slide outward in the straight groove 701.

[0060] The inclined surface of the wedge 502 can reduce the squeezing force of liquid and debris on the wedge 502 during the chip removal process, thereby increasing the difficulty of the liquid and debris flowing and driving the wedge 502 to move, thus avoiding the separation of the drill bit 2 and the drill rod 1 during drilling and improving the safety of use.

[0061] Connecting the drill bit 2 and the drill rod 1 with a connector can effectively ensure the connection strength. The limiting plate 5 and the fixing plate 7 limit the mating plate 8, which can effectively improve the connection strength. In addition, the contact area at the connection is large, which can avoid fatigue damage at the connection due to alternating torque and axial force.

[0062] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A connection structure for an internal chip removal deep hole drill, characterized in that, Includes a mounting base (4) installed at one end of the drill rod (1), and a connecting sleeve (3) installed at the end of the drill bit (2) away from the cutting edge; The connecting sleeve (3) is fitted into the mounting base (4); Multiple sets of fixing plates (7) are installed on the mounting base (4), and the fixing plates (7) are equidistantly distributed along the circumference of the mounting base (4). A connector is provided between the connecting sleeve (3) and the mounting base (4), and the connector can limit the displacement of the connecting sleeve (3).

2. The connection structure of an internal chip removal deep hole drill according to claim 1, characterized in that, The connector includes multiple sets of mating plates (8), which are equidistantly arranged along the circumference of the connecting sleeve (3) and fixedly connected to the inner wall of the connecting sleeve (3); the mounting base (4) is provided with a sliding groove (402); the mounting base (4) is provided with multiple sets of limiting plates (5) that mate with the mating plates (8); the limiting plates (5) are equipped with fitting blocks (501) that slide and fit into the sliding groove (402); the mounting base (4) is fitted with a spring (6); the two ends of the spring (6) abut against the limiting plate (5) and the mounting base (4) respectively.

3. The connection structure of an internal chip removal deep hole drill according to claim 2, characterized in that, The limiting plate (5) is inclined on the side away from the drill rod (1); the mating plate (8) is also inclined on the side away from the drill bit (2).

4. The connection structure of an internal chip removal deep hole drill according to claim 1, characterized in that, The connector also includes a protruding post (9) installed on the inner wall of the connecting sleeve (3); the fixing plate (7) is provided with a locking groove group that slides and engages with the protruding post (9).

5. The connection structure of an internal chip removal deep hole drill according to claim 4, characterized in that, The locking groove group includes a straight groove (701) and an arc groove (702); wherein, one end of the straight groove (701) passes through the mounting base (4); the other end is connected to one end of the arc groove (702); the other end of the arc groove (702) is closed.

6. The connection structure of an internal chip removal deep hole drill according to claim 2, characterized in that, The mounting base (4) has a slot (401) inside; a wedge (502) that is fixedly connected to the limiting plate (5) is slidably installed in the slot (401).

7. The connection structure of an internal chip removal deep hole drill according to claim 6, characterized in that, The wedge (502) is inclined on the side closest to the drill bit (2).

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