Drill bit for small-diameter deep hole

Abstract

The utility model discloses a drill bit for a small-diameter deep hole, which comprises a cutting rod and a tail cone, a cylindrical groove is arranged at the end of the cutting rod, a cylindrical part is formed at the end of the tail cone, an annular groove is formed on the cylindrical part, and the annular groove and the cylindrical groove are locked through a locking piece; the locking piece comprises a locking screw, a moving block and a locking reed; the locking screw is in threaded fit with the locking screw hole in the cutting rod, a tool groove is formed in the locking screw, the moving block is in sliding fit with the moving groove in the cutting rod, the locking reed is fixedly arranged on the moving block, and the locking reed is in clamping fit with clamping grooves evenly formed in the annular groove. According to the utility model, the locking piece, the clamping groove and the like are matched for use, so that a slipping phenomenon occurs between the cutting rod and the tail cone when the cutting rod is clamped during processing, and a twisting-off phenomenon at the joint of the cutting rod and the tail cone is avoided; and in addition, cooling liquid can be cooled in the machining process, and chippings generated in the machining process are flushed out.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, in particular to a drill bit for small-diameter deep holes. Background Art

[0002] During the processing of small-diameter deep-hole drills, due to the long length of the drill bits, when the installation position of the drill bits deviates or due to improper operation by the staff, the drill bits may get stuck during the processing. At this time, the drill bits are prone to breakage due to excessive jamming force. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a drill bit for small-diameter deep holes, which effectively solves the problems raised by the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drill bit for small-diameter deep holes, comprising a cutting rod and a tail cone, wherein a cylindrical groove is provided at the end of the cutting rod, a cylindrical portion is formed at the end of the tail cone, an annular groove is formed on the cylindrical portion, and the annular groove and the cylindrical groove are locked by a locking member; the locking member comprises a locking screw, a moving block and a locking spring; the locking screw is threadedly matched with a locking screw hole on the cutting rod, and a tool groove is formed on the locking screw, the moving block is slidably matched with the moving groove on the cutting rod, the locking spring is fixedly arranged on the moving block, and the locking spring is snap-fitted with a slot evenly formed on the annular groove.

[0005] Preferably, the horizontal cross-section of the locking spring is in the shape of a triangle, the bottom end of the locking spring and the inner bottom wall of the annular groove are both inclined, and the tip of the conical portion formed by the inner bottom wall of the annular groove faces upward.

[0006] Preferably, a central through hole is provided inside the cutting rod and inside the tail cone, and the central through hole on the cutting rod is connected to the central through hole on the tail cone.

[0007] Preferably, a butt joint is formed on one end of the tail cone away from the cylindrical portion, and the butt joint is in the shape of a strip.

[0008] Preferably, a tapered portion is formed on one end of the cutting rod away from the cylindrical groove, the outer wall of the tapered portion is evenly and fixedly provided with edge cutting edges, and a central cutting edge is fixedly provided at the center of the tapered portion, and the central cutting edge is located above the edge cutting edge.

[0009] Preferably, cooling holes are evenly formed on the outer wall of the tapered portion, and the cooling holes are connected to the central through hole on the cutting rod.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] During operation, by using the locking parts, slots, etc., when the cutting rod gets stuck during processing, the cutting rod and the tail cone can be caused to slip, thereby avoiding twisting at the connection between the two. By using the central through hole and cooling hole, the coolant can be cooled during processing and the debris generated by the processing can be flushed out, thereby ensuring the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0013] In the attached picture:

[0014] Figure 1 This is a schematic diagram of the structure of a drill bit for small-diameter deep holes of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the cylindrical groove of the utility model;

[0016] Figure 3 For the utility model Figure 2 The enlarged structural diagram at A in the middle;

[0017] Figure 4 This is a schematic diagram of the tail cone structure of the utility model;

[0018] Figure 5 This is a schematic diagram of the locking structure of the utility model;

[0019] Figure 6 It is a schematic diagram of the structure of the tapered portion of the utility model.

[0020] In the figure: 1, cutting rod; 101, locking screw hole; 102, moving groove; 2, tail cone; 3, cylindrical groove; 4, cylindrical part; 5, annular groove; 6, locking piece; 601, locking screw; 602, moving block; 603, locking spring; 604, tool groove; 7, card slot; 8, center through hole; 9, docking part; 10, tapered part; 11, edge cutting edge; 12, center cutting edge; 13, cooling hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] Embodiment 1, by Figure 1-6 The utility model relates to a drill bit for small-diameter deep holes, comprising a cutting rod 1 and a tail cone 2. A cylindrical groove 3 is provided at the end of the cutting rod 1, a cylindrical portion 4 is formed at the end of the tail cone 2, an annular groove 5 is formed on the cylindrical portion 4, and the annular groove 5 and the cylindrical groove 3 are locked by a locking member 6; the locking member 6 comprises a locking screw 601, a moving block 602 and a locking spring 603; the locking screw 601 is threadedly matched with a locking screw hole 101 on the cutting rod 1, and a tool groove 604 is formed on the locking screw 601, the moving block 602 is slidably matched with the moving groove 102 on the cutting rod 1, the locking spring 603 is fixedly arranged on the moving block 602, and the locking spring 603 is snap-fitted with a card groove 7 uniformly formed on the annular groove 5;

[0023] With such a design, during the process of the tail cone 2 driving the cutting rod 1 to perform drilling, when the cutting rod 1 gets stuck, the tail cone 2 will still rotate under the action of force, so that the slot 7 on the tail cone 2 squeezes the locking spring 603 in the locking member 6, so that the locking spring 603 enters the next slot 7 in the annular groove 5, thereby causing slippage between the tail cone 2 and the cutting rod 1, thereby preventing the tail cone 2 and the cutting rod 1 from twisting off due to getting stuck during processing, thereby playing a protective role; and within the range of the twisting force not exceeding the breaking force, the locking spring 603 will be stuck in the inside of the slot 7, thereby achieving the fixation of the tail cone 2 and the cutting rod 1, so as to drive the cutting rod 1 to perform drilling operations.

[0024] The horizontal cross-section of the locking spring 603 is in the shape of a triangle. The bottom end of the locking spring 603 and the inner bottom wall of the annular groove 5 are both inclined, and the tip of the cone formed by the inner bottom wall of the annular groove 5 faces upward.

[0025] This design makes it easy to increase the contact area between the locking spring 603 and the annular groove 5, thereby improving the connection strength between the tail cone 2 and the cutting rod 1, and after the locking spring 603 enters the annular groove 5, it can also prevent the tail cone 2 from detaching from the cutting rod 1.

[0026] A central through hole 8 is provided inside the cutting rod 1 and inside the tail cone 2, and the central through hole 8 on the cutting rod 1 is connected to the central through hole 8 on the tail cone 2;

[0027] With such a design, during processing, coolant can be passed into the interior of the central through hole 8 through a conduit, thereby achieving a cooling effect.

[0028] A butt joint 9 is formed at one end of the tail cone 2 away from the cylindrical portion 4, and the butt joint 9 is in the shape of a strip;

[0029] Such a design makes it easy to fix the tail cone 2 on the power equipment through the docking portion 9, so that the tail cone 2 can be driven to rotate by the power equipment.

[0030] A tapered portion 10 is formed on one end of the cutting rod 1 away from the cylindrical groove 3, and an edge cutting edge 11 is evenly and fixedly arranged on the outer wall of the tapered portion 10, and a central cutting edge 12 is fixedly arranged at the center of the tapered portion 10, and the central cutting edge 12 is located above the edge cutting edge 11;

[0031] Such a design facilitates preliminary positioning and processing through the center cutting edge 12 and drilling operations through the edge cutting edge 11 .

[0032] The outer wall of the tapered portion 10 is evenly provided with cooling holes 13, which are connected to the central through hole 8 on the cutting rod 1;

[0033] This design facilitates the coolant in the central through hole 8 to be discharged through the cooling hole 13, so that during processing, the coolant can be used to reduce the temperature on the one hand, and on the other hand, the coolant can be used to flush out the chips generated by the processing.

Claims

1. A drill bit for a small-diameter deep hole, comprising a cutting rod (1) and a tail cone (2), characterized in that: The end of the cutting rod (1) is provided with a cylindrical groove (3), the end of the tail cone (2) is formed with a cylindrical portion (4), an annular groove (5) is formed on the cylindrical portion (4), and the annular groove (5) and the cylindrical groove (3) are locked by a locking member (6); the locking member (6) comprises a locking screw (601), a moving block (602) and a locking spring (603); the locking screw (601) is threadedly matched with a locking screw hole (101) on the cutting rod (1), and a tool groove (604) is formed on the locking screw (601); the moving block (602) is slidably matched with the moving groove (102) on the cutting rod (1), the locking spring (603) is fixedly arranged on the moving block (602), and the locking spring (603) is snap-fitted with a snap groove (7) uniformly formed on the annular groove (5).

2. A small diameter deep hole drill according to claim 1, characterized in that: The horizontal cross-section of the locking spring (603) is in the shape of a triangle. The bottom end of the locking spring (603) and the inner bottom wall of the annular groove (5) are both inclined, and the tip of the conical portion formed by the inner bottom wall of the annular groove (5) faces upward.

3. A small diameter deep hole drill according to claim 1, characterized in that: The interior of the cutting rod (1) and the interior of the tail cone (2) are both provided with a central through hole (8), and the central through hole (8) on the cutting rod (1) is connected to the central through hole (8) on the tail cone (2).

4. A small diameter deep hole drill according to claim 1, characterized in that: An end of the tail cone (2) away from the cylindrical portion (4) forms a docking portion (9), and the docking portion (9) is in the shape of a strip.

5. A small diameter deep hole drill according to claim 3, characterized in that: A conical portion (10) is formed on one end of the cutting rod (1) away from the cylindrical groove (3), and an edge cutting edge (11) is evenly and fixedly arranged on the outer wall of the conical portion (10), and a central cutting edge (12) is fixedly arranged at the center of the conical portion (10), and the central cutting edge (12) is located above the edge cutting edge (11).

6. A small diameter deep hole drill according to claim 5, characterized in that: The outer wall of the tapered portion (10) is evenly provided with cooling holes (13), and the cooling holes (13) are connected to the central through hole (8) on the cutting rod (1).

Images