A reamer suitable for deep holes

Abstract

The utility model provides a reamer suitable for deep hole, including the reamer ring and the reamer bar body, the reamer ring is detachably connected in the reamer bar body end. The reamer bar body end is equipped with the center connecting portion, and the reamer ring is equipped with the center cooperation portion matched with the center connecting portion, a locking element passes through the center cooperation portion and is equipped with the threaded hole connection of the center connecting portion, to with the reamer ring and the reamer bar body axial compression fixed. The end of the reamer bar body is provided with a circumferential positioning pin, the reamer ring is provided with a positioning hole matched with the circumferential positioning pin, and the circumferential positioning pin is matched with the positioning hole to limit the circumferential rotation of the reamer ring relative to the reamer bar body. The outer circumferential surface of the reamer ring is provided with at least two cutting edges. The utility model sets up detachable reamer ring, and the worn cutting edge is convenient for quick replacement, and the multiple cutting edges of the reamer ring participate in cutting simultaneously, which significantly improves the machining efficiency, avoids the centralized wear problem caused by the single-edge structure, and prolongs the overall life of the tool.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, specifically relating to a reamer suitable for deep holes. Background Technology

[0002] Deep hole machining is a challenging field in mechanical manufacturing. Some deep holes require micrometer-level machining accuracy, as well as excellent cylindricity and coaxiality. The single-edge guide bar reamer structure advocated by the German company Mapal has long been considered an industry standard and is widely used to achieve high-precision, high-surface-quality deep hole machining. The basic principle of this type of reamer is to use a single cutting edge for finishing, relying on multiple guide bars on the circumference of the tool to contact the machined hole wall, providing strong support and guidance, thereby effectively suppressing tool runout and ensuring the straightness and cylindricity of the hole. However, this single-edge guide bar reamer requires precision slots to be machined on the tool body for mounting inserts, guide bars, and complex locking mechanisms. These structures often have unique shapes, compact spaces, and extremely stringent tolerance requirements, leading to high difficulty in machining the tool shank during tool manufacturing. This makes it highly susceptible to defects due to dimensional inconsistencies or non-compliance with geometric tolerances, thus increasing the manufacturing cost of the tool. Furthermore, the radial position fine-tuning and locking mechanism of the cutting blade is complex, relying on expensive specialized tool-adjusting instruments, which increases the company's investment and places extremely high demands on the technical skills and experience of the operators. Key fasteners in the cutting blade locking and adjustment mechanism (such as specialized fine-tuning screws) have stringent requirements for material strength, toughness, and thread precision and stability, relying on original German parts. This results in excessively high procurement prices and long delivery cycles, significantly increasing tool maintenance costs and inventory pressure. Because this type of tool has only one main cutting edge undertaking all cutting tasks, the wear of this cutting edge is concentrated and rapid, leading to a short overall tool life, increasing uncertainty in machining and the frequency of tool changes. In cases of poor chip removal or insufficient lubrication and cooling, the single guide bar support method is prone to severe friction with the hole wall, even causing "seize-up" accidents. Once "seize-up" occurs, not only will the expensive reamer itself be scrapped, but it will also cause surface scratches on the workpiece's inner hole, or even scrap the entire product, resulting in significant economic losses. Due to the characteristics of single-edge cutting, in order to control the cutting force and ensure machining quality, the feed rate per revolution is usually limited to less than 0.15 mm / r, resulting in an extremely low metal removal rate, which cannot meet the needs of high-efficiency, mass production.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a reamer suitable for deep holes, which is equipped with a detachable reamer ring to avoid the concentrated wear problem caused by the single-edge structure, extend the overall service life of the tool, and the reamer ring, together with the guide bar, suppresses tool vibration, ensures the cylindricity and coaxiality accuracy of the hole, and improves the machining quality.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a reamer suitable for deep holes, comprising a tool holder body and a reamer ring, the reamer ring being detachably connected to the end of the tool holder body. The end of the tool holder body has a central connecting portion, and the reamer ring has a central mating portion that cooperates with the central connecting portion. A locking element passes through the central mating portion and connects to a threaded hole in the central connecting portion to axially press and fix the reamer ring and the tool holder body. The end of the tool holder body is provided with a circumferential locating pin, and the reamer ring has a locating hole that cooperates with the circumferential locating pin. The circumferential locating pin cooperates with the locating hole to restrict the circumferential rotation of the reamer ring relative to the tool holder body. At least two cutting edges are provided on the outer circumferential surface of the reamer ring. This utility model is used in deep hole reaming processes. In use, the locking element is inserted into the central mating portion and screwed into the threaded hole of the central connecting portion to axially press and fix the reamer ring and the tool holder body. After the tool holder body and the tool holder are connected, they are installed on the machine tool spindle interface. During deep hole reaming, multiple cutting edges on the outer circumference of the reamer ring participate in cutting simultaneously, significantly improving metal removal efficiency. The detachable design of the reamer ring facilitates quick replacement of worn cutting edges, reducing maintenance costs and inventory pressure, while avoiding the concentrated wear problem caused by a single-edge structure, thus extending the overall tool life.

[0006] Furthermore, in the aforementioned reamer suitable for deep holes, the central connecting part is a conical central boss, the central mating part is a conical through hole, and the locking element is a locking bolt. The connection via the locking bolt is convenient, efficient, and easy to procure, reducing the maintenance cost of the reamer.

[0007] Furthermore, in the aforementioned reamer suitable for deep holes, the taper of the central connecting part is set to 1:10. The taper setting of the central connecting part can automatically achieve centering connection, making the tool holder body and the reamer ring coaxially connected, reducing tool runout, and ensuring that the tool produces high-precision holes.

[0008] Furthermore, in the aforementioned reamer suitable for deep holes, the outer circumferential surface of the reamer body is provided with multiple guide bars, which are arranged along the axial direction of the reamer body. This invention is used for deep holes with ultra-high aspect ratios. During the reaming process, the guide bars on the outer circumferential surface of the reamer body are in close contact with the machined hole wall, providing stable support and guidance for the reamer body, effectively suppressing tool runout, and ensuring that the cylindricity and coaxiality of the hole reach μm-level accuracy.

[0009] Furthermore, in the aforementioned reamers suitable for deep holes, the outer diameter of the guide bar is set to be less than or equal to the outer diameter of the cutting edge. This setting can reduce friction between the guide bar and the hole wall, prevent the guide bar from "seizing up" on the hole wall, avoid tool damage, part scrapping or machine tool loss, provide chip space, prevent cutting scratches on the hole wall, and improve the surface finish of the hole wall.

[0010] Furthermore, in the aforementioned reamer suitable for deep holes, a flange is provided at the end of the shank body away from the reamer ring, and the shank body is connected to the tool holder through the flange to ensure the stability of the connection between the shank body and the tool holder.

[0011] Furthermore, in the aforementioned reamers suitable for deep holes, the tool holder is an adjustable flange tool holder. Connecting the tool holder body to the adjustable flange tool holder via the flange improves connection stability and ensures the tool holder is securely mounted on the machine tool spindle interface. Simultaneously, the adjustable flange tool holder and the tool holder body with the flange can be used to adjust the runout of the tool holder body to within 0.002mm via the tool holder screws provided on the adjustable flange tool holder.

[0012] As can be seen from the above technical solution, this utility model has the following beneficial effects: This utility model is applicable to reamers for deep holes, setting multiple cutting edges to participate in cutting simultaneously, significantly improving metal removal efficiency, meeting the needs of high-efficiency mass production, avoiding the concentrated wear problem caused by single-edge structures, and extending the overall service life of the tool. The detachable design of the reamer ring facilitates quick replacement of worn cutting edges, greatly reducing maintenance costs and inventory pressure. The guide bar's close contact with the hole wall provides stable support and guidance, effectively suppressing tool vibration and ensuring that hole machining achieves μm-level cylindricity and coaxiality accuracy. The guide bar's outer diameter is less than or equal to the cutting edge's outer diameter, reducing friction, avoiding seizure accidents, and preventing tool damage and workpiece scrap. Attached Figure Description

[0013] Figure 1 This is a front view of the reamer of this utility model applicable to deep holes; Figure 2 This is an exploded view of the reamer of this invention, applicable to deep holes; Figure 3 This is a side view of the reamer ring; Figure 4 for Figure 3 The AA-direction sectional view shown.

[0014] In the figure: 1. Tool holder body, 2. Reamer ring, 11. Central connecting part, 12. Circumferential locating pin, 13. Guide bar, 21. Central mating part, 22. Locating hole, 23. Flange part, 24. Cutting edge, 3. Tool holder. Detailed Implementation

[0015] Example 1 like Figures 1-4A reamer suitable for deep holes is shown, comprising a shank body 1 and a reamer ring 2, the reamer ring 2 being detachably connected to the end of the shank body 1. The end of the shank body 1 has a central connecting portion 11, and the reamer ring 2 has a central mating portion 21 that mates with the central connecting portion 11. A locking element passes through the central mating portion 21 and connects to a threaded hole in the central connecting portion 11 to axially press and fix the reamer ring 2 and the shank body 1. The end of the shank body 1 has a circumferential locating pin 12, and the reamer ring 2 has a locating hole 22 that mates with the circumferential locating pin 12. The circumferential locating pin 12 mates with the locating hole 22 to restrict the circumferential rotation of the reamer ring 2 relative to the shank body 1. At least two cutting edges 24 are provided on the outer circumferential surface of the reamer ring 2.

[0016] In this embodiment, the central connecting part 11 is a conical central boss, the central mating part 21 is a conical through hole, and the locking element is a locking bolt. The connection via the locking bolt is convenient, efficient, and easy to procure, reducing the maintenance cost of the reamer.

[0017] In this embodiment, the taper of the central connecting part 11 is set to 1:10. The taper-set central connecting part 11 can automatically achieve centering connection, making the tool holder body 1 and the reamer ring 2 coaxially connected, reducing tool runout, and ensuring that the tool produces high-precision holes. After the reamer ring 2 and the taper-set central connecting part 11 are connected, the reamer ring 2 and the tool holder body 1 maintain a gap of 0.01~0.015mm.

[0018] In this embodiment, a plurality of guide bars 13 are provided on the outer peripheral surface of the tool holder body 1, and the guide bars 13 are arranged along the axial direction of the tool holder body 1. This utility model is used for deep holes with an ultra-high aspect ratio. During the reaming process, the guide bars 13 on the outer peripheral surface of the tool holder body 1 are in close contact with the machined hole wall, providing stable support and guidance for the tool holder body 1, effectively suppressing tool runout, and ensuring that the cylindricity and coaxiality of the hole reach the μm level accuracy. The guide bars 13 are preferably made of cemented carbide or cermet. The guide bars 13 and the tool holder body 1 are preferably connected by welding.

[0019] In this embodiment, the outer diameter of the guide bar 13 is set to be less than or equal to the outer diameter of the cutting edge 24. The above setting can reduce the friction between the guide bar 13 and the hole wall, avoid the guide bar 13 from "seizing" on the hole wall, avoid tool damage, part scrapping or machine tool loss, provide chip space, avoid cutting scratches on the hole wall, and improve the surface finish of the hole wall.

[0020] In this embodiment, the end of the tool holder body 1 away from the reamer ring 2 is provided with a flange 23. The tool holder body 1 is connected to the tool handle 3 through the flange 23 to ensure the stability of the connection between the tool holder body 1 and the tool handle 3.

[0021] This invention is used in deep hole reaming. In use, a locking element is inserted into the central mating part 21 and screwed into the threaded hole of the central connecting part 11 to axially press and fix the reamer ring 2 and the tool holder body 1. At this time, the circumferential positioning pin 12 is inserted into the positioning hole 22, restricting the reamer ring 2 from rotating circumferentially relative to the tool holder body 1. Then, the tool holder body 1 is connected to the tool shank 3 via the flange part 23, and the connected assembly is installed on the machine tool spindle interface. During deep hole reaming, multiple cutting edges 24 on the outer circumferential surface of the reamer ring 2 participate in cutting simultaneously, improving machining efficiency. Moreover, due to the multiple cutting edges, the concentrated wear problem caused by the single-edge structure is avoided, extending the overall tool life. During machining, the reamer ring 2 first reams into the deep hole, and then the tool holder body 1 follows the reamer ring 2 into the deep hole. The guide bar 13 on the outer circumferential surface of the tool holder body 1 contacts the machined hole wall, providing stable support and guidance, effectively suppressing tool vibration, and ensuring the cylindricity and coaxiality of the hole. When the cutting edge 24 on the reamer ring 2 wears out, simply loosen the locking element, remove the worn reamer ring 2, replace it with a new reamer ring 2 and re-fix it, and you can continue processing, which greatly reduces maintenance costs and inventory pressure.

[0022] Example 2 The difference between this embodiment and Embodiment 1 is that the tool holder 3 is an adjustable flange tool holder. The tool holder body 1 is connected to the adjustable flange tool holder 3 via the flange 23, improving connection stability and ensuring the tool holder 3 is securely mounted on the machine tool spindle interface. Simultaneously, the adjustable flange tool holder 3 and the tool holder body 1 with the flange 23 cooperate, allowing the runout of the tool holder body 1 to be adjusted to within 0.002mm using the tool holder screws provided with the adjustable flange tool holder 3. The adjustable flange tool holder 3 can be selected from the MOD flange tool holder-BT manufactured by Shandong Jinjie Machinery Co., Ltd.

[0023] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A reamer suitable for deep holes, characterized in that: The tool includes a tool holder body (1) and a reamer ring (2), the reamer ring (2) being detachably connected to the end of the tool holder body (1); the end of the tool holder body (1) is provided with a central connecting part (11), the reamer ring (2) is provided with a central mating part (21) that cooperates with the central connecting part (11), a locking element passes through the central mating part (21) and connects to the threaded hole provided in the central connecting part (11) to axially press and fix the reamer ring (2) and the tool holder body (1); the end of the tool holder body (1) is provided with a circumferential positioning pin (12), the reamer ring (2) is provided with a positioning hole (22) that cooperates with the circumferential positioning pin (12), the circumferential positioning pin (12) cooperates with the positioning hole (22) to restrict the reamer ring (2) from rotating circumferentially relative to the tool holder body (1); at least two cutting edges (24) are provided on the outer circumferential surface of the reamer ring (2).

2. The reamer for deep holes according to claim 1, characterized in that: The central connecting part (11) is a conical central boss, the central mating part (21) is a conical through hole, and the locking element is a locking bolt.

3. The reamer for deep holes according to claim 2, characterized in that: The taper of the central connecting part (11) is set to 1:

10.

4. The reamer for deep holes according to claim 1, characterized in that: The outer circumferential surface of the tool holder body (1) is provided with a plurality of guide bars (13), which are arranged along the axial direction of the tool holder body (1).

5. The reamer for deep holes according to claim 4, characterized in that: The outer diameter of the guide bar (13) is set to be less than or equal to the outer diameter of the cutting edge (24).

6. The reamer for deep holes according to claim 1, characterized in that: The blade body (1) has a flange (23) at the end away from the reamer ring (2), and the blade body (1) is connected to the blade holder (3) through the flange (23).

Images