A support structure for a deep hole machining drill

Abstract

The utility model relates to a kind of support structure of deep hole machining drill bit, belong to deep hole processing field.The drill bit side groove is grooved, the support structure includes shell, the shell center is provided with through-hole, bearing is installed in through-hole, inner shaft with the through-hole being centrally provided is installed in bearing bore, the inner shaft sleeve is set in the grooved area of drill bit, inner shaft, bearing and shell are coaxially arranged, a plurality of ball bearings are provided between inner shaft and drill bit, the ball bearings are all embedded in the groove of drill bit side face.The utility model uses steel ball as the support of drill bit, can effectively solve the problem that long drill bit machining end cannot be fixed in use and causes swing.

Description

Technical Field

[0001] This utility model relates to the field of deep hole machining technology, specifically to a support structure for a deep hole machining drill bit. Background Technology

[0002] In deep hole drilling, extended drill bits are often used, with length-to-diameter ratios typically exceeding 6, and sometimes even reaching 10. As the length-to-diameter ratio increases, the drill bit is prone to deformation and wobbling during machining, leading to decreased machining accuracy and hole axis misalignment. Traditional solutions fall into two main categories: one is to improve overall rigidity by optimizing the drill rod material, but this is costly and has limited effectiveness; the other is to add support devices. For example, utility model patent CN219944723U proposes a stable support device for deep hole drill bits, supporting the extended section of the drill bit. However, this device must avoid the slotted area of ​​the drill bit, and it cannot effectively constrain long drill bits with a large slotted area. Utility Model Content

[0003] To address the problem of drill bit wobbling during deep hole machining, this invention proposes a support structure for deep hole machining drill bits.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A support structure for a deep hole drilling bit, wherein the drill bit has a groove on its side, characterized in that the support structure includes a housing, a through hole in the center of the housing, a bearing installed in the through hole, an inner shaft with a central through hole installed in the inner hole of the bearing, the inner shaft being sleeved in the grooved area of ​​the drill bit, the inner shaft, the bearing and the housing being coaxially arranged, and a plurality of balls being provided between the inner shaft and the drill bit, the balls being fitted into the groove on the side of the drill bit.

[0006] Preferably, the number of balls is not less than the number of slots on the side of the drill bit, and all balls are evenly embedded in the slots on the surface of the drill bit, ensuring that each slot on the side of the drill bit is supported by balls, so that the supporting force is evenly distributed and local stress concentration is reduced.

[0007] Preferably, the number of balls is at least three times the number of slots on the side of the drill bit. More balls can provide more support points, further enhancing the stability of the drill bit, while also better distributing the load and reducing the wear of individual balls.

[0008] Preferably, a portion of the ball is above the drill bit surface and in contact with the inner wall of the inner shaft, so that the supporting force provided by the support structure is transmitted to the drill bit through the ball.

[0009] Preferably, it also includes a ball cover plate for preventing the balls from coming out. The ball cover plate is installed at the end of the housing facing the drill bit head. The ball cover plate has a through hole in the center for the drill bit to pass through. The ball cover plate effectively prevents the balls from coming out during high-speed rotation and processing, thereby improving the safety and reliability of the processing.

[0010] More preferably, the ball bearing cover plate has several protrusions inside the through hole, which match the cross-sectional shape of the drill bit side groove to further restrict the ball from coming out.

[0011] More preferably, the ball bearing cover is fixedly connected to the housing to ensure that the ball bearing cover will not loosen or shift during processing.

[0012] Preferably, one end of the housing through hole is provided with an inwardly protruding limiting structure, and the inner wall of the other end is provided with a ring groove. The outer wall of the inner shaft is provided with a ring groove corresponding to the ring groove on the inner wall of the housing. A retaining ring is installed between the two ring grooves. This design can effectively limit the axial movement of the bearing and ensure the relative position stability between the bearing, the inner shaft and the housing.

[0013] Preferably, one end of the housing is provided with a flange edge, which facilitates the installation of the support structure on other equipment, thereby improving the versatility and installation stability of the device.

[0014] This invention uses steel balls as direct support for the drill bit, which can effectively solve the problem of the long drill bit wobbling due to the inability to fix the slotted area during processing. Moreover, the steel balls only exist in the slot and do not contact the cutting edge, thus avoiding affecting the service life of the drill bit and the support device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the support structure for a deep hole drilling bit according to the present invention;

[0016] Figure 2 This is a side view of the support structure of a deep hole drilling bit according to the present invention;

[0017] Figure 3 This is a cross-sectional view of the support structure of a deep hole drilling bit according to the present invention.

[0018] 1-Housing, 2-Bearing, 3-Ball, 4-Ball cover plate, 5-Retaining ring, 6-Inner shaft, 7-Drill bit. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following describes the specific implementation methods, structures and features of this utility model in conjunction with the accompanying drawings and preferred embodiments.

[0020] This embodiment describes a twist drill bit with a length-to-diameter ratio of 10 or higher. Approximately two-thirds of the drill bit has three helical grooves machined on it. This support structure is fitted onto the portion of the drill bit with the helical grooves. One or more of these support structures can be fitted at multiple locations on this portion of the drill bit to improve its stability. It should be emphasized that this invention can also be used with any drill bit that has grooves on its side, and is not limited to the drill bit described in this embodiment. The detailed solution of this embodiment is described below.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, a support structure for a deep hole drilling bit includes a housing 1, a bearing 2, balls 3, a ball cover plate 4, a retaining ring 5, and an inner shaft 6. Figure 1 The installation method of the support structure and drill bit 7 is specifically shown. A through hole is opened in the center of the housing 1, and two parallel bearings 2 are installed inside. The two bearings 2 are together fitted onto the outer side of the inner shaft 6. The inner shaft 6 has a central hole that fits into the slotted area of ​​the drill bit 7. Several steel balls 3 are provided between the inner hole of the inner shaft 6 and the drill bit 7, and are all embedded in the spiral grooves of the drill bit 7. The drill bit 7 is supported by the balls 3 embedded in the grooves. The radius of the inner hole of the inner shaft 6 is the sum of the radius of the drill bit 7 and the height of the ball 3 protruding from the groove. In this embodiment, there are nine balls 3, with three balls 3 embedded in each spiral groove of the drill bit 7.

[0022] The inner wall of one end of the housing 1 has a groove, and the other end has a ball bearing cover 4, with the end with the ball bearing cover 4 facing the drill bit head. The outer wall of one end of the inner shaft 6 has a groove corresponding to the groove on the inner wall of the housing 1. A retaining ring 5, which is a hard annular structure, is installed between the two grooves. At the end of the through hole in the housing 1 where the ball bearing cover 4 is located, an inwardly protruding limiting structure is also provided. This limiting structure cooperates with the retaining ring 5 to limit the bearing 2 and prevent it from falling out. The end of the inner shaft 6 where the retaining ring 5 is installed has a chamfered design to facilitate the insertion of the retaining ring 5. Both ends of the inner hole of the inner shaft 6 also have a chamfered design to facilitate assembly with the drill bit.

[0023] A through hole is formed in the center of the ball bearing cover plate 4. The diameter of the through hole in the ball bearing cover plate 4 is smaller than that of the through hole in the inner shaft 6, but slightly larger than the outer diameter of the drill bit. This hole is used to block the balls 3 inside the inner shaft 6, preventing the balls 3 from coming out. Several protrusions are added inside the through hole of the ball bearing cover plate 4. These protrusions match the cross-sectional shape of the spiral groove of the drill bit 7, further preventing the balls 3 from coming out of the gap between the spiral groove and the cover plate. In this embodiment, the outer surface of the drill bit 7 has three spiral grooves, and correspondingly, three protrusions are provided inside the through hole of the ball bearing cover plate 4. Several fixing holes are also provided on the ball bearing cover plate 4, and threaded holes that match these fixing holes are provided on the housing 1. The fixing holes and threaded holes are connected by screws to fix the ball bearing cover plate 4 to the housing 1. A flange is provided at one end of the housing 1 for fixed connection with external devices.

[0024] In use, first, the bearing 2 is fitted over the inner shaft 6, and the retaining ring 5 is installed in the groove of the inner shaft 6. Then, the housing 1 is fitted over the bearing 2, and the ball cover plate 4 is fixed on the housing 1. Subsequently, the balls 3 are installed in the spiral groove of the drill bit. The drill bit with the balls 3 is then fitted into the inner shaft 6 from the side without the ball cover plate 4, so that all the balls 3 are located inside the inner shaft 6. When the drill bit is working, the drill bit has a tendency to rotate and move towards the ball cover plate 4 due to the action of the external drive mechanism. The balls 3 rotate with the rotation of the drill bit, and at the same time drive the inner shaft 6 to rotate. The housing 1 is fixed to the external support or frame structure and does not rotate. The supporting force is transmitted to the spiral groove of the drill bit in sequence through the housing 1, bearing 2, inner shaft 6 and balls 3.

[0025] This invention can effectively solve the problem of the long drill bit 7 being unable to be fixed during use, causing it to swing. In addition, the ball bearing 3 is only in the spiral groove and does not contact the cutting edge, so it will not produce cutting.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A support structure for a deep hole drilling bit, wherein the drill bit has a slot on its side, characterized in that, The support structure includes a housing (1), with a through hole in the center of the housing (1) and a bearing (2) installed in the through hole. An inner shaft (6) with a through hole in the center is installed in the inner hole of the bearing (2). The inner shaft (6) is sleeved on the slotted area of ​​the drill bit. The inner shaft (6), the bearing (2) and the housing (1) are all coaxially arranged. A number of balls (3) are provided between the inner shaft (6) and the drill bit. The balls (3) are all embedded in the grooves on the side of the drill bit.

2. The support structure for the deep hole drilling bit according to claim 1, characterized in that, The number of the balls (3) is not less than the number of slots on the side of the drill bit, and all the balls (3) are evenly embedded in the slots on the surface of the drill bit.

3. The support structure for the deep hole drilling bit according to claim 1, characterized in that, The number of the balls (3) is at least three times the number of slots on the side of the drill bit.

4. The support structure for the deep hole drilling bit according to claim 1, characterized in that, A portion of the ball (3) is above the drill bit surface and contacts the inner wall of the inner shaft (6).

5. The support structure for the deep hole drilling bit according to claim 1, characterized in that, It also includes a ball cover plate (4) for preventing the ball (3) from falling out. The ball cover plate (4) is installed on the end of the housing (1) facing the drill head, and a through hole for the drill bit to pass through is opened in the center of the ball cover plate (4).

6. The support structure for the deep hole drilling bit according to claim 5, characterized in that, The ball bearing cover (4) has several protrusions inside the through hole, which match the cross-sectional shape of the drill bit side groove.

7. The support structure for the deep hole drilling bit according to claim 5, characterized in that, The ball bearing cover (4) is fixedly connected to the housing (1).

8. The support structure for the deep hole drilling bit according to claim 1, characterized in that, The housing (1) has an inwardly protruding limiting structure at one end of the through hole, and a ring groove is opened on the inner wall of the other end. The outer wall of the inner shaft (6) has a ring groove corresponding to the ring groove on the inner wall of the housing (1), and a retaining ring (5) is installed between the two ring grooves.

9. The support structure for the deep hole drilling bit according to claim 1, characterized in that, The housing (1) has a flange edge at one end.

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