High-precision deep hole drill bit

Abstract

The utility model relates to the field of woodworking tools. The high-precision deep hole drill bit comprises a drill bit body and a supporting bearing used for supporting the drill bit body. The drill bit body comprises a rod part used for being connected with a clamp and a head part arranged at one end of the rod part and used for drilling. The supporting bearing is arranged outside the middle section of the rod part in a sleeving mode, and the rod part and the supporting bearing are in sliding fit in the length direction of the rod part. Under the large drilling depth, wood chips in a drilled hole can be rapidly discharged, the drilling precision is guaranteed, and the hole is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the field of woodworking tools, in particular to a drill bit. Background Art

[0002] The ultra-deep hole drill bit is a special drill in woodworking drills, which is mainly used to process ultra-long deep holes on a workpiece board, and is mainly applied to the opening of the through-long shaft holes of large-sized workpieces or other special customized requirements. Although its usage amount in woodworking operations is relatively small compared with traditional drill bits, its performance is directly related to the performance of some special customized parts.

[0003] For deep hole drills, due to the large drilling depth, the effectiveness of chip removal is directly related to the overall processing performance. At present, the commonly used deep hole drill in the woodworking industry is generally an A-type drill, and spiral chip removal grooves are processed on the drill body. During the high-speed rotation of the drill bit, in cooperation with the repeated advancement and retreat of the machine head (driving the drill bit to advance and retreat repeatedly in the hole), during the drill withdrawal process, the wood chips in the hole are quickly discharged through the chip removal grooves to avoid damage to the hole by the wood chips. However, this method requires repeated advancement and retreat of the drill. For example, when a 30CM hole needs to be opened, first drill in 10CM and then withdraw, then drill in 20CM and withdraw again, and finally drill in 30CM and withdraw. This method requires repeated advancement and retreat of the drill, reducing the processing efficiency. Summary of the Invention

[0004] The purpose of the utility model is to provide a high-precision deep hole drill bit capable of effectively removing chips.

[0005] To achieve the above invention purpose, the technical solution adopted by the utility model is: a high-precision deep hole drill bit, including a drill bit body and a support bearing for supporting the drill bit body;

[0006] The drill bit body includes a rod portion for connecting with a fixture, and a head portion for drilling provided at one end of the rod portion; the support bearing is sleeved outside the middle section of the rod portion, and a sliding fit capable of sliding along the length direction of the rod portion is formed between the rod portion and the support bearing;

[0007] A central air hole extending along the length direction of the rod portion is provided in the center of the rod portion, and a plurality of air inlet side holes for introducing flushing gas into the central air hole are provided on the side wall of the rod portion; a flushing air hole with one end communicating with the central air hole and the other end extending to the end face of the head portion is provided in the head portion;

[0008] A communication hole is provided on the inner ring side wall of the support bearing, and a pressurized air pipe capable of conveying flushing gas to the inner ring is provided on the outer ring;

[0009] The intake side hole is a stepped hole with a smaller inner end and a larger outer end. A control assembly is arranged inside the intake side hole. The control assembly includes a plug arranged at the outer end of the intake side hole and threadedly connected to the intake side hole; a spring ring is arranged between the plug and the stepped surface of the intake side hole, and a movable disk that forms a sliding fit with the intake side hole. The movable disk is pressed against the plug by the spring ring; a disk hole is arranged at the center of the movable disk, and side holes are arranged at positions on the plug that are staggered with the disk hole.

[0010] Preferably, the intake side holes are evenly distributed on the upper and lower sides of the rod portion, and the intake side holes on the upper and lower sides are staggered with each other.

[0011] Preferably, an internal hexagonal screwing portion is arranged on the plug.

[0012] Preferably, two chip removal grooves and two cutting edges are symmetrically arranged at the center of the head.

[0013] Preferably, the end face of the head is an inclined plane that slopes obliquely outwards.

[0014] Preferably, a positioning tip is arranged at the center of the end face of the head.

[0015] Preferably, the support bearing is fixed on the machine frame through a bearing seat.

[0016] The beneficial effects of the present utility model are mainly reflected in that even under a relatively large drilling depth, the wood chips in the drilled hole can be quickly discharged, the accuracy of the drilled hole can be guaranteed, and the hole can be prevented from being damaged. Specifically, during the deep hole drilling process of the present utility model, it can be drilled in one go without retracting the tool to remove chips, and the efficiency is higher. During operation, the rod portion of the present utility model is installed on the machine head through a fixture, and the machine head drives the drill bit body to rotate and feed; during the drilling process, the high-pressure flushing gas can enter the drilled hole through the pressurized air pipe, communication hole, intake side hole, disk hole, and flushing air hole of the present utility model, and blow out the wood chips from the bottom of the hole in a timely and rapid manner. Therefore, there is no need to bring out the wood chips by retracting the tool. Even in deep hole processing, the processing accuracy and efficiency can be extremely well guaranteed, and the hole can be prevented from being damaged. At the same time, the middle section of the drill bit body is supported by the support bearing, which can further ensure its stability and processing accuracy, and can provide an entry channel and space for the entry of the flushing gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is Figure 1 the enlarged view of part A in

[0019] Figure 3 is Figure 1 the left view of the drill bit body in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] As Figures 1-3 shown, a high-precision deep-hole drill bit is mainly used for processing deep holes in woodworking boards. It includes a drill bit body and a support bearing 1 for supporting the drill bit body. The drill bit body includes a head 2 and a rod portion 3. Generally, the head 2 is made of high-hardness alloy or formed by loading diamond blades on the surface of the metal collection. As Figure 3 shown in, for example: there are two chip removal grooves 16 and two cutting edges 17 symmetrically arranged at the center of the head 2. The diameter of the head 2 of the present utility model is larger than that of the rod portion 3, so that after the wood chips are exported from the chip removal grooves 16, there is enough external discharge space. In order to ensure the drilling accuracy, a positioning tip can be provided at the center of the end face of the head 2.

[0021] The rod portion 3 of the present utility model is used to connect with a fixture 4, so as to install it on the machine head. The machine head is used to drive the drill bit body to rotate and feed, and the head 2 is arranged at one end of the rod portion 3. The support bearing 1 is sleeved outside the middle section of the rod portion 3, and a sliding fit that can slide along the length direction of the rod portion 3 is formed between the rod portion 3 and the support bearing 1. In this way, on the one hand, the support bearing 1 can play a role in supporting the middle section of the drill bit body 1, and on the other hand, the support bearing 1 can also provide a stable entry channel for the high-pressure gas of the present utility model. Usually, the support bearing 1 is fixed on the frame of the drilling machine through a bearing seat 18 to form a stable fixation.

[0022] A special feature of the present utility model is that it uses high-pressure gas as the medium for flushing and chip removal to realize the cleaning of wood chips in the drilled hole. For this purpose, combined with Figure 1 and 2 shown in, a central air hole 5 extending along the length direction of the rod portion 3 is provided in the center of the rod portion 3 of the present utility model, and a number of air inlet side holes 6 for introducing flushing gas into the central air hole 5 are provided on the side wall of the rod portion 3. A flushing air hole 7 with one end communicating with the central air hole 5 and the other end extending to the end face of the head 2 is provided in the head 2.

[0023] That is to say, the high-pressure gas first enters the central air hole 5 from the air inlet side hole 6, and then enters the flushing air hole 7 from the central air hole 5, so as to rush out from the bottom of the hole and take out the wood chips in the drilled hole. Due to the movement characteristics of the drill bit body in the radial direction, and the support bearing 1 being an air inlet component, it not only requires no influence on the rotation of the drill bit body during air inlet, but also is convenient for building the air path. For this purpose, a communication hole 8 is provided on the inner ring side wall of the support bearing 1 of the present utility model, and a pressurized air pipe 9 capable of conveying flushing gas towards the inner ring is provided on the outer ring. The pressurized air pipe 9 is connected to an external high-pressure gas source (such as an air compressor storage cylinder), and its action can be realized through an electric control air valve. After the high-pressure gas enters from the pressurized air pipe 9, it can be communicated with the air inlet side hole 6 on the side wall of the rod portion 3 through the communication hole 8 provided on the inner ring side wall.

[0024] Of course, due to the different positions of the air intake side holes 6 corresponding to the support bearing 1, only the air intake side holes 6 corresponding to the support bearing 1 can be opened, and the other air intake side holes 6 should be in a normally closed state. Figure 3 As shown, the air inlet side hole 6 of the utility model is a stepped hole with a small inner end and a large outer end. A control component is arranged in the air inlet side hole 6, and the control component includes a sealing plug 10 arranged at the outer end of the air inlet side hole 6 and threadedly connected to the air inlet side hole 6. An elastic ring 11 is arranged between the sealing plug 10 and the stepped surface of the air inlet side hole 6, and a movable disk 12 is formed to slide with the air inlet side hole 6, and the movable disk 12 is pressed against the sealing plug 10 through the elastic ring 11. A disk hole 13 is arranged at the center of the movable disk 12, and a side hole 14 is arranged on the sealing plug 10 at a position staggered with the disk hole 13.

[0025] During use, after high-pressure gas enters through the pressurized air pipe 9, as the pressure at the connecting hole 8 of the support bearing 1 increases, the elastic ring 11 at the corresponding air inlet side hole 6 is pressed inward, and at this time, the disc hole 13 and the side hole 14 are connected, and the high-pressure gas can enter. Under the dual effects of the internal pressure and the elastic ring 11, the movable disc 12 of the other air inlet side holes 6 is tightly sealed against the plug 10, and at this time, the disc hole 13 and the side hole 14 are disconnected. In order to ensure the stability of rotation, the air inlet side holes 6 are generally evenly distributed on the upper and lower sides of the rod 3. In order to further reduce the number of openings and ensure the strength of the rod, the air inlet side holes 6 on the upper and lower sides are preferably staggered.

[0026] In order to facilitate installation and removal of the elastic ring 11, the sealing plug 10 is provided with a hexagonal screwing portion 15. In addition, in order to further ensure the flow of high-pressure airflow in the drilled hole, the end face of the head 2 is an inclined surface inclined outward.

Claims

1. A high-precision deep-hole drill bit, characterized in that: It includes a drill bit body and a support bearing (1) for supporting the drill bit body; The drill bit body includes a rod portion (3) for connecting with a fixture (4), and a head portion (2) for drilling provided at one end of the rod portion (3); the support bearing (1) is sleeved outside the middle section of the rod portion (3), and a sliding fit capable of sliding along the length direction of the rod portion (3) is formed between the rod portion (3) and the support bearing (1); A central air hole (5) extending along the length direction of the rod portion (3) is provided in the center of the rod portion (3), and a plurality of air inlet side holes (6) for introducing flushing gas into the central air hole (5) are provided on the side wall of the rod portion (3); a flushing air hole (7) with one end communicating with the central air hole (5) and the other end extending to the end face of the head portion (2) is provided in the head portion (2); A communication hole (8) is provided on the inner ring side wall of the support bearing (1), and a pressurized air pipe (9) capable of conveying flushing gas towards the inner ring is provided on the outer ring; The air inlet side hole (6) is a stepped hole with a small inner end and a large outer end, and a control component is provided in the air inlet side hole (6). The control component includes a plug (10) provided at the outer end of the air inlet side hole (6) and threadedly connected with the air inlet side hole (6); a spring washer (11) is provided between the plug (10) and the stepped surface of the air inlet side hole (6), and a movable disk (12) forming a sliding fit with the air inlet side hole (6), and the movable disk (12) is pressed tightly against the plug (10) by the spring washer (11); a disk hole (13) is provided in the center of the movable disk (12), and side holes (14) are provided at positions on the plug (10) staggered with the disk hole (13).

2. The high-precision deep-hole drill bit according to claim 1, characterized in that: The air inlet side holes (6) are evenly distributed on the upper and lower sides of the rod portion (3), and the air inlet side holes (6) on the upper and lower sides are staggered with each other.

3. The high-precision deep-hole drill bit according to claim 2, characterized in that: An internal hexagonal screwing portion (15) is provided on the plug (10).

4. The high-precision deep-hole drill bit according to claim 3, characterized in that: Two chip removal grooves (16) and two cutting edges (17) are symmetrically arranged at the center of the head portion (2).

5. The high-precision deep-hole drill bit according to claim 4, characterized in that: The end face of the head portion (2) is an inclined surface inclined obliquely outwards.

6. The high-precision deep-hole drill bit according to claim 5, characterized in that: A positioning tip is provided at the center of the end face of the head portion (2).

7. The high-precision deep-hole drill bit according to claim 6, wherein: The support bearing (1) is fixed on the machine frame through a bearing seat (18).

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