Split type spinning flanging drill bit

Abstract

The utility model discloses a split type spinning flanging drill bit, which belongs to the technical field of drill bits, and comprises a connecting handle and a drill bit body, the side wall of one end of the connecting handle is provided with a first inclined surface, the drill bit body is provided with a second inclined surface, the second inclined surface is attached to the first inclined surface, and the drill bit body can move relative to the connecting handle along the first inclined surface. The drill bit body is provided with a flanged conical surface and a flanged straight cylinder cambered surface which are connected with each other relative to the second inclined surface, and the drill bit body is detachably and fixedly connected with the connecting handle. According to the split type spinning flanging drill bit, the drill bit body and the connecting handle are designed to be of a split structure, the drill bit body can be independently replaced, material waste is reduced, the position of the drill bit body can be adjusted, the split type spinning flanging drill bit can be suitable for machining requirements of different flangings, use universality is wide, operation is easy, and machining efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and particularly to a split spinning flanging drill bit. Background Art

[0002] At present, during some assembly operations, flanging processing needs to be carried out at the through holes of metal plates or metal pipes to facilitate stable connection. Traditional through-hole flanging processing generally uses a punch for flanging. For example, the Chinese invention patent document with the publication number CN117753869A discloses a punch, a stamping device and a stamping method for punching and flanging. Among them, the punch for punching and flanging includes a punching section, a flanging conical section and a flanging straight section connected in sequence. During processing, the punching section punches the plate or pipe, and then gradually flanges it by relying on the flanging conical section. Finally, the flanging straight section punches the through hole to form the final flange. The punch disclosed in this patent document can meet certain through-hole flanging requirements, but there are still many problems in the actual operation process. For example, after long-term use, the flanging conical section is severely worn. When it can no longer be used, the user can only replace the punch as a whole, that is, the connection section connected to the punch for connecting to the press also needs to be replaced, resulting in waste of materials; at the same time, the same flanging conical section can only process flanges of specific sizes, and its versatility is poor, making it difficult to meet the need for processing different flanges with the same flanging conical section. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is that in the prior art, when the punch used for flanging is damaged, it needs to be replaced as a whole, resulting in waste of materials. At the same time, the same punch can only process flanges of one size, and its versatility is poor. Therefore, the utility model provides a split spinning flanging drill bit that can avoid overall replacement and has strong versatility.

[0004] The technical solution adopted by the utility model to solve its technical problem is: a split spinning flanging drill bit, including a connecting handle and a drill bit body. A first inclined surface is provided on the side wall at one end of the connecting handle, and a second inclined surface is provided on the drill bit body. The second inclined surface is in mutual fit with the first inclined surface, and the drill bit body can move relative to the connecting handle along the first inclined surface. A mutually connected flanging conical surface and a flanging straight cylindrical arc surface are provided on the drill bit body relative to the second inclined surface. The drill bit body and the connecting handle are detachably and fixedly connected.

[0005] Further, an adjustment groove is axially formed in the connecting handle along the axial direction of the connecting handle, and the adjustment groove penetrates the first inclined surface. The drill bit body can move along the length direction of the adjustment groove. A connecting hole is formed on the second inclined surface, and a connecting piece is installed on the connecting handle. One end of the connecting piece passes through the adjustment groove and is fixedly connected to the connecting hole.

[0006] Further, the connecting member is a bolt, and the connecting hole is a threaded hole adapted to the bolt.

[0007] Further, a washer is sleeved outside the bolt, and the washer is clamped between the head of the bolt and the connecting handle.

[0008] Further, the washer is an open washer or a disc washer.

[0009] Further, a receiving groove for receiving the head of the bolt is formed on the end surface of the connecting handle away from the drill bit body, and the adjusting groove is recessed from the groove wall of the receiving groove close to the drill bit body.

[0010] Further, mutually cooperating serrated structures are provided on both the first inclined surface and the second inclined surface.

[0011] Further, the included angle between the first inclined surface and the longitudinal plane is α, and 0.5° ≤ α ≤ 1.5°.

[0012] Further, the included angle between the flanging conical surface and the longitudinal plane is β, and 25° ≤ β ≤ 35°.

[0013] Further, one end of the connecting handle away from the drill bit body forms a connecting end, and the flanging conical surface is located on the side of the flanging straight cylindrical arc surface away from the connecting end, or the flanging conical surface is located on the side of the flanging straight cylindrical arc surface close to the connecting end.

[0014] The beneficial effects of the present utility model are as follows: After the split spinning and flanging drill bit of the present utility model is used for a long time, when the drill bit body needs to be replaced due to severe wear, there is no need to replace the drill bit as a whole. Only the drill bit body needs to be replaced separately, and the connecting handle does not need to be replaced, which greatly reduces material waste. At the same time, by moving the drill bit body relative to the connecting handle along the first inclined surface, the vertical distance between the outer surface of the drill bit body and the central axis of the connecting handle can be changed. In this way, the inner diameter size of the final straight cylindrical flanging can be controlled. Without replacing the drill bit, the user only needs to adjust the position of the drill bit body to be applicable to the processing requirements of different flangings. The universality of use is wide, and the operation is simple, which greatly improves the processing efficiency. Description of the Drawings

[0015] The following further illustrates the present utility model in conjunction with the drawings and embodiments.

[0016] Figure 1 is a three-dimensional view of the split spinning and flanging drill bit of the present utility model;

[0017] Figure 2 is Figure 1 a three-dimensional view of the split spinning and flanging drill bit shown from another perspective;

[0018] Figure 3 is Figure 1 The exploded view of the split spinning and flanging drill bit shown

[0019] Figure 4 is Figure 2 The exploded view of the split spinning and flanging drill bit shown

[0020] Figure 5 is Figure 1 The top view of the split spinning and flanging drill bit shown

[0021] Figure 6 is Figure 5 The sectional view of the split spinning and flanging drill bit shown along A-A

[0022] Figure 7 It is the sectional view of another structure of the split spinning and flanging drill bit of the present utility model

[0023] In the figure: 1. Connecting handle, 11. First inclined surface, 12. Adjusting groove, 13. Accommodating groove, 101. Connecting end, 2. Drill bit body, 21. Second inclined surface, 22. Flanging conical surface, 23. Flanging straight cylindrical arc surface, 24. Connecting hole, 3. Connecting piece, 4. Washer Specific embodiments

[0024] Now, the present utility model will be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic manner, so it only shows the components related to the present utility model

[0025] Please refer to Figures 1 - 7 , the present utility model provides a split spinning and flanging drill bit, which includes a connecting handle 1 and a drill bit body 2. A first inclined surface 11 is provided on the side wall of one end of the connecting handle 1, and a second inclined surface 21 is provided on the drill bit body 2. The second inclined surface 21 is in mutual fit with the first inclined surface 11, and the drill bit body 2 can move relative to the connecting handle 1 along the first inclined surface 11. A mutually connected flanging conical surface 22 and a flanging straight cylindrical arc surface 23 are provided on the drill bit body 2 opposite to the second inclined surface 21, and the drill bit body 2 and the connecting handle 1 are detachably and fixedly connected

[0026] For the split spinning and flanging drill bit of the present utility model, during use, first move the drill bit body 2 to the position of the pre-drilled hole of the workpiece, then adjust the position of the connecting handle 1 so that the rotation central axis of the connecting handle 1 is coaxial with the pre-drilled hole. Next, start the rotary driving device for driving the connecting handle 1 to rotate, thereby driving the drill bit body 2 to rotate at a high speed around the rotation central axis of the connecting handle 1. Then, feed the drill bit along the axial direction of the pre-drilled hole so that the flanging conical surface 22 first contacts the pre-drilled hole. As the feeding depth of the drill bit gradually increases and the flanging conical surface 22 violently rubs against the pre-drilled hole, the generated high temperature rapidly softens the material around the pre-drilled hole. The pre-drilled hole is gradually flanged under the spinning action of the flanging conical surface 22 and then forms a ring neck on the surface of the workpiece. After the ring neck passes through the flanging conical surface 22 and contacts the flanging straight cylinder arc surface 23, the ring neck is shaped by the flanging straight cylinder arc surface 23, and finally a straight cylinder flanging is formed.

[0027] After the split spinning and flanging drill bit of the present utility model is used for a long time and the drill bit body 2 needs to be replaced due to serious wear, there is no need to replace the drill bit as a whole. Only the drill bit body 2 needs to be replaced separately, and the connecting handle 1 does not need to be replaced. The split structure design between the drill bit body 2 and the connecting handle 1 greatly reduces material waste. At the same time, moving the drill bit body 2 relative to the connecting handle 1 along the first inclined surface 11 can change the vertical distance between the outer surface of the drill bit body 2 (i.e., the flanging conical surface 22 and the flanging straight cylinder arc surface 23) and the central axis of the connecting handle 1. In this way, the inner diameter size of the final straight cylinder flanging can be controlled. The user does not need to replace the drill bit, and only needs to adjust the position of the drill bit body 2 to be applicable to the processing requirements of different flangings. The use is widely applicable and the operation is simple, which greatly improves the processing efficiency.

[0028] Please refer to Figure 4 、 Figure 6 As a preferred embodiment, an adjustment groove 12 is axially formed in the connecting handle 1 along the axial direction of the connecting handle 1. The adjustment groove 12 penetrates the first inclined surface 11. The drill bit body 2 can move along the length direction of the adjustment groove 12. A connecting hole 24 is formed on the second inclined surface 21 of the drill bit body 2. A connecting member 3 is installed on the connecting handle 1. One end of the connecting member 3 passes through the adjustment groove 12 and is fixedly connected to the connecting hole 24. During use, after moving the drill bit body 2 relative to the connecting handle 1 along the length direction of the adjustment groove 12 to a suitable position, the connecting member 3 is inserted into the adjustment groove 12 and the drill bit body 2 is locked, thereby locking the drill bit body 2 on the connecting handle 1, and then realizing the fixed connection relationship between the connecting handle 1 and the drill bit body 2. In a specific embodiment, the adjustment groove 12 is a kidney-shaped groove.

[0029] In this embodiment, the connecting member 3 is a bolt, specifically an internal hexagonal bolt, and the connecting hole 24 is a threaded hole that mates with the bolt. It can be understood that in other embodiments not shown, a stud protrudes from the second inclined surface 21 of the drill bit body 2. The stud can move along the length direction of the adjustment groove 12 after passing through the adjustment groove 12. After moving into place, a lock nut is installed on the stud, and the fixed connection relationship between the connecting shank 1 and the drill bit body 2 can also be achieved. The specific connection method is not limited here.

[0030] Furthermore, a washer 4 is sleeved outside the bolt. The washer 4 is clamped between the head of the bolt and the connecting shank 1. After being clamped, the washer 4 undergoes elastic deformation, which can pre-tighten the bolt, prevent the connecting member 3 from loosening easily, and improve the connection stability between the drill bit body 2 and the connecting shank 1. The washer 4 can be an open washer or a disc washer, which is not limited here.

[0031] In addition, a receiving groove 13 is formed on the end surface of the connecting shank 1 away from the drill bit body 2. The adjustment groove 12 is recessed from the groove wall of the receiving groove 13 close to the drill bit body 2. The receiving groove 13 is used to receive the head of the bolt.

[0032] Tooth structures are provided on both the first inclined surface 11 and the second inclined surface 21. When the connecting shank 1 and the drill bit body 2 are connected, the tooth structures on their inclined surfaces cooperate with each other. On the one hand, it increases the fitting area between the first inclined surface 1 and the second inclined surface 21. On the other hand, the tooth structures can effectively prevent the fitting surfaces from easily shifting, ensuring the connection reliability between the connecting shank 1 and the drill bit body 2.

[0033] In this embodiment, the angle between the first inclined surface 11 and the longitudinal plane is α. The size of α directly determines the change amount of the vertical distance between the outer surface of the drill bit body 2 and the central axis of the connecting shank 1 when the drill bit body 2 moves a unit distance along the length direction of the adjustment groove 12 relative to the connecting shank 1. Specifically, the smaller α is, the smaller the vertical distance that the drill bit body 2 moves radially outward along the connecting shank 1 when it moves a unit distance, and the higher the precision of the fine adjustment. Among them, 0.5° ≤ α ≤ 1.5°. In a specific embodiment, α = 1°.

[0034] In this embodiment, the angle between the flanging conical surface 22 and the longitudinal plane is β, where 25° ≤ β ≤ 35°. In a specific embodiment, β = 30°.

[0035] It should be noted that the split spinning and flanging drill bit of the present utility model can achieve internal and external flanging of the drilled hole by replacing different drill bit bodies 2 without replacing the connection shank 1. To clearly illustrate the technical solution of the present utility model, it is stipulated here that one end of the connection shank 1 far from the drill bit body 2 forms a connection end 101 for docking with the rotary drive device. When selecting and installing the drill bit body 2, when the flanging conical surface 22 is located on the side of the flanging straight cylindrical arc surface 23 far from the connection end 101 (please refer to Figure 7 ), at this time, the feeding movement of the drill bit can drive the flanging conical surface 22 to move to achieve internal flanging. Taking a pipe as an example, moving inward along the radial direction of the pipe can cause the pre-drilled hole position to be flanged inward, forming a collar inside the pipe; when the flanging conical surface 22 is located on the side of the flanging straight cylindrical arc surface 23 close to the connection end 101 (please refer to Figure 6 ), at this time, the feeding movement of the drill bit can drive the flanging conical surface 22 to move to achieve external flanging. Similarly taking a pipe as an example, first move the drill bit body 2 into the pipe, and then move outward along the radial direction of the pipe, which can cause the pre-drilled hole position to be flanged outward, forming a collar with the outside of the pipe. Therefore, during specific operation, the user can select different drill bit bodies 2 to meet the processing requirements of internal and external flanging.

[0036] Inspired by the above ideal embodiments according to the present utility model, through the above description, relevant staff can make various changes and modifications without departing from the scope of the present utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A split spinning and flanging drill bit, characterized in that: It includes a connecting handle and a drill bit body. A first inclined surface is provided on the side wall of one end of the connecting handle, and a second inclined surface is provided on the drill bit body. The second inclined surface is in mutual fit with the first inclined surface, and the drill bit body can move relative to the connecting handle along the first inclined surface. A flanging conical surface and a flanging straight cylinder arc surface which are connected to each other are provided on the drill bit body opposite to the second inclined surface, and the drill bit body is detachably and fixedly connected to the connecting handle.

2. The split spinning and flanging drill bit according to claim 1, wherein: An adjustment groove is axially formed in the connecting handle along the axis of the connecting handle. The adjustment groove penetrates the first inclined surface, and the drill bit body can move along the length direction of the adjustment groove. A connection hole is formed in the second inclined surface, and a connecting piece is installed on the connecting handle. One end of the connecting piece passes through the adjustment groove and is fixedly connected to the connection hole.

3. The split spinning flanging drill bit according to claim 2, wherein: The connecting piece is a bolt, and the connection hole is a threaded hole matching with the bolt.

4. The split spinning and flanging drill bit according to claim 3, wherein: A washer is sleeved outside the bolt, and the washer is clamped between the head of the bolt and the connecting handle.

5. The split spinning and flanging drill bit according to claim 4, wherein: The washer is an open washer or a disc washer.

6. The split spinning and flanging drill bit according to claim 3, wherein: A receiving groove for receiving the head of the bolt is formed on the end surface of the connecting handle away from the drill bit body, and the adjustment groove is recessed from the groove wall of the receiving groove close to the drill bit body.

7. The split spinning and flanging drill bit according to claim 1, wherein: Mutually matching serrated structures are provided on both the first inclined surface and the second inclined surface.

8. The split spinning and flanging drill bit according to claim 1, wherein: The included angle between the first inclined surface and the longitudinal plane is α, and 0.5° ≤ α ≤ 1.5°.

9. The split spinning and flanging drill bit according to claim 1, characterized in that: The included angle between the flanging conical surface and the longitudinal plane is β, and 25° ≤ β ≤ 35°.

10. The split spinning and flanging drill bit according to claim 1, wherein: A connection end is formed at one end of the connecting handle away from the drill bit body. The flanging conical surface is located on the side of the flanging straight cylinder arc surface away from the connection end, or the flanging conical surface is located on the side of the flanging straight cylinder arc surface close to the connection end.

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