Pipeline reamer bit
The pipe expansion drill bit with inclined cutting grooves and stable positioning mechanism addresses high wear issues by stabilizing the drill within the pipe and optimizing cutting efficiency, reducing material loss and maintenance needs.
Patent Information
- Application Number
- CN202422309830.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The cutting amount of cutting edge of the existing drill bits during reaming holes is large, resulting in a decrease in the sharpness of the blade and an increase in the drill bit maintenance frequency.
A pipe reaming drill bit is designed with a multi-size drilling structure, including a large diameter, a middle diameter and a small diameter part, a cutting groove and chip removal surface are set, and the cutting edge angle and extension surface are optimized through the inclined design to form the main cutting edge, secondary cutting edge and positioning clamping blade to improve cutting fluidity and chip removal efficiency.
It reduces cutting resistance, reduces the loss of cutting edge, and improves cutting fluidity and hole reaming quality.
Smart Images
Figure CN223098082U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipe processing, in particular to a pipe reaming bit. Background Art
[0002] A reamer is generally used for semi-finishing or finishing of holes, for pre-processing before reaming or grinding, or for enlarging rough holes.
[0003] Existing drills do not have a pre-cutting action during reaming, resulting in a large cutting amount for the cutting edge. A large cutting amount causes relatively large wear to the cutting edge, which not only affects the sharpness of the edge but also increases the maintenance frequency of the drill bit. Summary of the Utility Model
[0004] The utility model aims to solve the above-mentioned drawbacks of the prior art and provides a pipe reaming bit to solve the above problems.
[0005] The technical solution adopted by the utility model to solve its technical problems: This kind of pipe reaming bit includes a drill shank and a drill body. The drill shank is fixed at the center of the upper end face of the drill body. A number of cutting grooves are formed on the outer peripheral surface of the drill body by machining and are distributed along its circumferential direction. The drill body includes a large-diameter part, a medium-diameter part, and a small-diameter part. The cutting grooves are simultaneously formed on the large-diameter part, the medium-diameter part, and the small-diameter part, and a cutting surface and a chip removal surface are obtained. The cutting surface forms a main cutting edge on the large-diameter part, a secondary cutting edge on the medium-diameter part, and a positioning cutting edge on the small-diameter part.
[0006] Further improvement: The cutting surface is inclined to the right from the large-diameter part to the small-diameter part.
[0007] Further improvement: The chip removal surface is inclined backward from the large-diameter part to the small-diameter part.
[0008] Further improvement: The cutting groove has a configuration with a longitudinal section and a transverse section in the plane obtained by horizontally cutting the drill body. One end of the longitudinal section has point a, the connection position of the longitudinal section and the transverse section has point b, and one end of the transverse section has point c. An angle D exists between point a, point b, and point c, and 88° ≤ D ≥ 65°.
[0009] Further improvement: An inclined extension surface is provided between the bottom surface of the large-diameter part and the outer peripheral surface of the medium-diameter part, and between the bottom surface of the medium-diameter part and the outer peripheral surface of the small-diameter part. The extension surface is circular along the axis of the drill body.
[0010] Further improvement: The extension surface is inclined. The main cutting edge forms an angle E through the extension surface, and E = 120°. The secondary cutting edge forms an angle F through the extension surface, and F = 120°.
[0011] Further improvement: The cutting surface and the chip removal surface are flat or arc-shaped surfaces.
[0012] The beneficial effects of the present utility model are as follows:
[0013] The drill body of the present utility model has multiple sizes. That is, the small-diameter part is used as a positioning structure to ensure the stability of the drill body in the pipe hole without the need for position adjustment. The medium-diameter part and the large-diameter part are both used as cutting structures to form a sequential machining effect. This reduces the cutting thickness of the large-diameter part, thereby reducing the cutting resistance during cutting, improving the cutting smoothness, and also being able to reduce the wear of the cutting edge. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural diagram of the present utility model;
[0015] Figure 2 is a schematic structural diagram of the upper part of the present utility model;
[0016] Figure 3 is a schematic structural diagram of the front of the present utility model;
[0017] Figure 4 is a schematic structural diagram of the present utility model with an arc-shaped cutting surface and chip removal surface. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The present utility model will be further described below in conjunction with the accompanying drawings:
[0019] Referring to the attached drawings: This pipe reaming bit includes a drill shank 1 and a drill body 2. The drill shank 1 is fixed at the central position of the upper end face of the drill body 2. A number of cutting grooves 3 are provided on the outer peripheral surface of the drill body 2 and are distributed along its circumferential direction through machining. The drill body 2 includes a large-diameter part 21, a medium-diameter part 22, and a small-diameter part 23. The cutting grooves 3 are formed on the large-diameter part 21, the medium-diameter part 22, and the small-diameter part 23 at the same time, and a cutting surface 4 and a chip removal surface 5 are obtained. The cutting surface 4 forms a main cutting edge 41 on the large-diameter part 21, a secondary cutting edge 42 on the medium-diameter part 22, and a positioning cutting edge 43 on the small-diameter part 23. The principle of the present invention lies in that the cutting grooves 3 enable cutting edges to be formed on the drill body 2 and a chip removal space for chip removal during cutting, and the drill body 2 has multiple sizes, that is, the small-diameter part 23 is used as a positioning structure. The outer diameter of the small-diameter part 23 matches the inner diameter size of the pipe hole that has not been reamed yet, so that the small-diameter part 23 can ensure the stability of the drill body 2 in the pipe hole when entering the pipe hole, and no position adjustment is required, nor does it require manual control of the straightness of the drill body 2. The positioning cutting edge 43 formed by the cutting surface 4 of the small-diameter part 23 can also be removed, and it can also make the cutting grooves 3 be arranged in a penetrating manner that is conducive to chip removal. The medium-diameter part 22 and the large-diameter part 21 are both used as cutting structures. The medium-diameter part 22 feeds first, and the large-diameter part 21 feeds later, so that the cutting thickness of the large-diameter part 21 is reduced, thereby reducing the cutting resistance of the drill bit during cutting, improving the cutting smoothness, and also being able to reduce the wear of the cutting edge. In this embodiment, the use length of the small-diameter part 23 has a long style and a short style, which is selected based on the depth of the pipe hole.
[0020] The cutting surface 4 is inclined to the right from the large-diameter part 21 to the small-diameter part 23. Such a setting can not only increase the space of the cutting groove 3, but also the inclination has a guiding effect, which helps to discharge the cutting chips.
[0021] The chip removal surface 5 is inclined backward from the large-diameter part 21 to the small-diameter part 23. Such a setting can not only increase the space of the cutting groove 3, but also the inclination has a guiding effect, which helps to discharge the cutting chips.
[0022] The cutting groove 3 has a configuration with a longitudinal section 31 and a transverse section 32 in the plane obtained by horizontally cutting the drill body 2. One end of the longitudinal section 31 has a point a, the connection position of the longitudinal section 31 and the transverse section 32 has a point b, and one end of the transverse section 32 has a point c. An angle D exists between the point a, the point b, and the point c, and 88° ≤ D ≥ 65°. Such a setting enables the rake angles of both the main cutting edge 41 and the secondary cutting edge 42 to be maintained within this range. In this solution, 85° is selected, which can make the cutting edge sharp, reduce the cutting force, lower the cutting temperature, make the cutting more smooth, and also help with chip removal.
[0023] An inclined extension surface 6 is provided between the bottom surface of the large-diameter portion 21 and the outer peripheral surface of the middle-diameter portion 22, and between the bottom surface of the middle-diameter portion 22 and the outer peripheral surface of the small-diameter portion 23. The extension surface 6 is circular along the axis of the drill body 2. The extension surface 6 is used to increase the thickness of the portion of the large-diameter portion 21 exceeding the middle-diameter portion 22 and increase the thickness of the portion of the middle-diameter portion 22 exceeding the small-diameter portion 23, thereby increasing the usage range of the cutting edge, that is, increasing the covered range during cutting, and thus improving the cutting efficiency.
[0024] The extension surface 6 is inclined. The main cutting edge 41 forms an angle E through the extension surface 6, E = 120°. The secondary cutting edge 42 forms an angle F through the extension surface 6, F = 120°. The setting of the obtuse angle can increase the usage range of the cutting edge. Considering that the main cutting edge 41 is for backward feed, such a setting can avoid the interference of the main cutting edge 41 during feed (the interference comes from the inconsistent angle between the secondary cutting edge 42 and the main cutting edge 41, that is, the prior cutting trace is inconsistent with the configuration of the main cutting edge 41), and can also avoid the uncut residual part on the pipe hole after cutting, so as to ensure the reaming quality.
[0025] The cutting surface 4 and the chip removal surface 5 are flat surfaces or arc surfaces.
[0026] Although the present utility model has been illustrated and described by reference to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.
Claims
1. A pipe reaming bit, comprising a drill shank (1) and a drill body (2). The drill shank (1) is fixed at the central position of the upper end face of the drill body (2). A plurality of cutting grooves (3) are provided on the outer peripheral surface of the drill body (2) and are distributed along its circumferential direction by machining. It is characterized in that: The drill body (2) includes a large-diameter portion (21), a medium-diameter portion (22), and a small-diameter portion (23). The cutting groove (3) is formed on the large-diameter portion (21), the medium-diameter portion (22), and the small-diameter portion (23) simultaneously, and a cutting surface (4) and a chip removal surface (5) are obtained. The cutting surface (4) forms a main cutting edge (41) on the large-diameter portion (21), a secondary cutting edge (42) on the medium-diameter portion (22), and a positioning cutting edge (43) on the small-diameter portion (23).
2. The pipe reaming bit according to claim 1, wherein: The cutting surface (4) is inclined to the right from the large-diameter portion (21) to the small-diameter portion (23).
3. The pipe reaming bit according to claim 1, characterized in that: The chip removal surface (5) is inclined backward from the large-diameter portion (21) to the small-diameter portion (23).
4. The pipe reaming bit according to claim 1, characterized in that: The cutting groove (3) has a configuration with a longitudinal segment (31) and a transverse segment (32) in a plane obtained by horizontally cutting the drill body (2). One end of the longitudinal segment (31) has point a, the position where the longitudinal segment (31) is connected to the transverse segment (32) has point b, and one end of the transverse segment (32) has point c. There is an included angle D between point a, point b, and point c, and 88° ≤ D ≥ 65°.
5. The pipe reaming bit according to claim 4, wherein: An inclined extension surface (6) is provided between the bottom surface of the large-diameter portion (21) and the outer peripheral surface of the medium-diameter portion (22), and between the bottom surface of the medium-diameter portion (22) and the outer peripheral surface of the small-diameter portion (23). The extension surface (6) is circular along the axis of the drill body (2).
6. The pipe reaming bit according to claim 5, wherein: The extension surface (6) is inclined. The main cutting edge (41) forms an included angle E through the extension surface (6), and E = 120°. The secondary cutting edge (42) forms an included angle F through the extension surface (6), and F = 120°.
7. The pipe reaming bit according to claim 1, wherein: The cutting surface (4) and the chip removal surface (5) are plane or arc-shaped surfaces.