A deep hole boring tool

Abstract

This utility model relates to the field of deep hole machining tools, specifically to a deep hole reaming tool. The deep hole reaming tool includes a fastening ring, a sleeve, a tool mounting base, and at least one tool head assembly. The tool mounting base has a connecting pipe, a tool head base, and a connecting shaft connected in sequence. A limiting surface for restricting the sleeve is formed between the connecting shaft and the tool head base. The sleeve is rotatably mounted on the connecting shaft via a bearing, with the end face of the sleeve close to the limiting surface. The fastening ring is threaded to the end of the connecting shaft away from the tool head base. The guide block only moves relative to the steel pipe along its axial direction, without rotating relative to the steel pipe. This allows the guide block to effectively support and guide the tool while also effectively reducing tool vibration, improving deep hole machining accuracy, and extending tool life.

Description

Technical Field

[0001] This utility model relates to the field of deep hole machining tools, specifically to a deep hole reaming tool. Background Technology

[0002] Due to the uneven distribution of cutting forces during deep hole boring, the tool path is easily deviated, and the tool is prone to vibration, leading to severe tool wear during boring. To mitigate these problems in deep hole machining, guide blocks are often installed on the circumference of the broaching tool. These guide blocks provide support and guidance, reduce tool vibration, improve deep hole machining accuracy, and extend tool life. Typically, the guide blocks are welded to the circumference of the broaching tool, as exemplified by the integrated boring and rolling tool for deep hole machining published in authorization announcement number CN 203426475 U.

[0003] The guide block of a common broaching tool is welded to the outer circumference of the boring head. Since the broaching tool and the steel pipe to be processed rotate relative to each other, when the guide block is in close contact with the inner wall of the steel pipe to be processed, there will be a lot of friction between the two, which will not be able to effectively reduce the vibration of the tool body and weaken the vibration reduction effect. Utility Model Content

[0004] (I) The problem to be solved by this utility model is that the guide block of the commonly used broaching tool is welded to the outer circumferential surface of the boring head, and the broaching tool and the steel pipe to be processed rotate relative to each other. Therefore, when the guide block is in close contact with the inner wall of the steel pipe to be processed, there will be a large friction between the two, which weakens the effect of reducing vibration.

[0005] (II) Technical Solution

[0006] A deep hole reaming tool includes a fastening ring, a sleeve, a tool mounting base, and at least one tool head assembly; the tool mounting base has a connecting pipe, a tool head base, and a connecting shaft connected in sequence, and a limiting surface for limiting the sleeve is formed between the connecting shaft and the tool head base;

[0007] A sleeve is rotatably mounted on the connecting shaft via a bearing. The end face of the sleeve is close to the limiting surface. A fastening ring is threaded to the end of the connecting shaft away from the cutter head base, and the fastening ring is located on the side of the sleeve away from the connecting tube. The fastening ring cooperates with the limiting surface to restrict the movement of the sleeve along the axial direction of the connecting shaft.

[0008] The outer circumferential surface of the sleeve is provided with multiple mounting grooves around its axis, and a guide block is installed in each mounting groove;

[0009] The connecting pipe is detachably connected to the boring bar main rod, and the cutting head assembly is detachably installed on the cutting head base, with the cutting head assembly arranged along the radial direction of the cutting head base.

[0010] According to one embodiment of the present invention, the connecting shaft has an external thread on the circumferential surface of the end away from the cutter head base, and the fastening ring has an internal thread on the inner circumferential surface that matches the external thread.

[0011] According to one embodiment of the present invention, two bearings are provided, and the two bearings are respectively disposed on the inner walls of both sides of the sleeve.

[0012] According to one embodiment of the present invention, the cutter head assembly includes a cutter bar, a cutter head, and a first bolt; a slot penetrating the cutter head base is provided on the cutter head base along its radial direction, and a locking bolt hole corresponding to the slot is provided on the circumferential surface of the cutter head base, the slot and the corresponding locking bolt hole are connected; the first end of the cutter bar passes through the slot and is exposed to the external environment, and its second end is located inside the slot; a second bolt is provided in the locking bolt hole, and the cutter bar is locked in the slot by the second bolt; the cutter head is fixed to the first end of the cutter bar by the first bolt.

[0013] According to one embodiment of the present invention, the cutter head base is provided with a plurality of slots, and the plurality of slots are arranged along the axial direction of the cutter head base; a plurality of cutter head assemblies are provided, and the plurality of cutter head assemblies are distributed in a stepped manner along the axial direction of the cutter head base; along the direction from the connecting shaft to the connecting pipe, the distance between the cutter head of the cutter head assembly and the axial direction of the cutter head base gradually decreases.

[0014] According to one embodiment of the present invention, the absolute value of the distance difference between any two adjacent cutting heads and the axis of the cutting head base is the same.

[0015] According to one embodiment of the present invention, each of the slots corresponds to two locking bolt holes.

[0016] According to one embodiment of the present invention, the guide block is a plastic block.

[0017] According to one embodiment of the present invention, the connecting pipe is threadedly connected to the boring bar main rod.

[0018] According to one embodiment of the present invention, the end of the tool holder is provided with a tool head mounting groove, and a fixing bolt hole adapted to the first bolt is provided in the tool head mounting groove.

[0019] The beneficial effects of this utility model are:

[0020] During boring, the sleeve moves along the axis of the boring bar as the main bar moves, while the steel pipe rotates under the action of the drive device. Since the sleeve can rotate relative to the entire tool, the guide block will only move relative to the steel pipe along the axis of the steel pipe, and will not rotate relative to the steel pipe. Therefore, there will be no friction between the guide block and the inner wall of the steel pipe caused by rotation, which avoids a series of problems caused by rotational friction between the guide block and the inner wall of the steel pipe. This allows the guide block to effectively support and guide while also effectively reducing tool vibration, improving the accuracy of deep hole machining, and extending tool life. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram showing the deep hole reaming tool assembled onto the boring bar as provided in this embodiment of the utility model;

[0023] Figure 2 Structural diagram of the deep hole reaming tool and boring bar provided in the embodiments of this utility model;

[0024] Figure 3 Exploded view of the deep hole reaming tool provided in this embodiment of the utility model;

[0025] Figure 4 Structural diagram of the cutter head mounting base and cutter shank provided in the embodiments of this utility model;

[0026] Figure 5 A cross-sectional view of the cutter head mounting base provided in an embodiment of this utility model;

[0027] Figure 6 Structural diagram of the fastening ring, sleeve, and guide block provided for embodiments of this utility model.

[0028] Icons: 1. Boring tool main shaft; 2. Tool mounting base; 201. Tool head base; 202. Connecting pipe; 203. Connecting shaft; 204. Slot; 205. External thread; 206. Locking bolt hole; 207. Disc; 3. Sleeve; 301. Mounting groove; 302. Threaded hole; 4. Fastening ring; 401. Internal thread; 5. Guide block; 501. Countersunk hole; 6. Tool shank; 601. Fixing bolt hole; 602. Tool head mounting groove; 7. Tool head; 8. First bolt; 9. Second bolt; 10. Bearing. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figures 1-6 As shown, one embodiment of the present invention provides a deep hole reaming tool, including a fastening ring 4, a sleeve 3, a tool mounting base 2, and at least one tool head assembly; the tool mounting base 2 has a connecting pipe 202, a tool head base 201, and a connecting shaft 203 connected in sequence, and a limiting surface for limiting the sleeve 3 is formed between the connecting shaft 203 and the tool head base 201;

[0031] A sleeve 3 is rotatably mounted on the connecting shaft 203 via a bearing 10. The end face of the sleeve 3 is close to the limiting surface. A fastening ring 4 is threaded to the end of the connecting shaft 203 away from the cutter head base 201, and the fastening ring 4 is located on the side of the sleeve 3 away from the connecting tube 202. The fastening ring 4 cooperates with the limiting surface to restrict the movement of the sleeve 3 along the axial direction of the connecting shaft 203.

[0032] Multiple mounting grooves 301 are provided on the outer circumferential surface of the sleeve 3 around its axis, and a guide block 5 is installed in each mounting groove 301;

[0033] The connecting pipe 202 is detachably connected to the boring bar main rod 1, and the cutting head assembly is detachably installed on the cutting head base 201, and the cutting head assembly is arranged along the radial direction of the cutting head base 201.

[0034] In this embodiment, since the sleeve 3 is rotatably mounted on the connecting shaft 203 of the cutter head base 201 via the bearing 10, and the guide block 5 is mounted on the outer circumferential surface of the sleeve 3, during boring, since the sleeve 3 can rotate relative to the entire tool, the guide block 5 will rotate synchronously with the steel pipe. The guide block 5 will only move relative to the steel pipe in the axial direction of the steel pipe, and will not rotate relative to the steel pipe. Therefore, there will be no frictional force between the guide block 5 and the inner wall of the steel pipe due to rotation, which can effectively reduce the vibration of the tool body, improve the deep hole machining accuracy and tool life.

[0035] It should be added that, in an ideal sliding guide (such as a non-rotating push boring), a stable sliding friction should be established between the guide block 5 and the wall of the steel pipe hole. This friction is relatively constant and can provide a continuous and predictable damping force, just like a car brake pad firmly gripping the brake disc, which can effectively absorb vibration energy.

[0036] During boring, the guide block 5 moves along the axis of the steel pipe while also rotating. For any point on the inner wall of the steel pipe, the direction of motion of the guide block 5 is the vector combination of the tangential velocity of the guide block 5's rotation and the axial feed velocity. The direction and magnitude of this combined velocity are constantly changing, which transforms the friction state from stable sliding friction into complex kinetic friction with constantly changing direction. Since the direction and magnitude of this frictional force change at high frequency, it is impossible to form a stable and reliable damping force to suppress the vibration of the tool holder, thus reducing its vibration reduction effect.

[0037] In addition, the inner wall of a steel pipe cannot be a perfectly smooth cylinder; it must contain microscopic unevenness, material inconsistency, and minor scratches left from previous processes.

[0038] In pure sliding (such as push boring) conditions: guide block 5 will smoothly "slide" over these defects. Although it will also cause changes in friction, the frequency of change is low and the impact on the push boring system is small.

[0039] In the case of boring, the rotating guide block 5 will repeatedly and frequently impact and roll over every tiny protrusion or depression on the inner wall, which will also lead to a reduction in the vibration damping effect.

[0040] Finally, the rotational motion causes the entire circumferential surface of guide block 5 to contact and wear against the hole wall, rather than only a specific area wearing down as with sliding guides. This results in guide block 5 losing its precise geometry more quickly, weakening its supporting function.

[0041] In this embodiment, during boring, the sleeve 3 moves along the axis of the boring bar 1 as the boring bar 1 moves. The steel pipe rotates under the action of the driving device. Since the sleeve 3 can rotate relative to the entire tool, the guide block 5 will only move relative to the steel pipe in the axial direction of the steel pipe, and will not rotate relative to the steel pipe. Therefore, there will be no friction between the guide block 5 and the inner wall of the steel pipe caused by rotation. This avoids a series of problems caused by rotational friction between the guide block 5 and the inner wall of the steel pipe. As a result, the guide block 5 can effectively reduce tool vibration, improve deep hole machining accuracy, and extend tool life while providing effective support and guidance.

[0042] That is, because the guide block 5 rotates synchronously with the steel pipe, the guide block 5 is always in close contact with the wall of the steel pipe hole, which increases stability, reduces friction, and extends the service life of the guide block 5.

[0043] In this embodiment, as Figure 4As shown, the tool mounting base 2 includes a connecting shaft 203, a tool head base 201, and a connecting pipe 202 connected in sequence. Both the tool head base 201 and the connecting shaft 203 are cylindrical. The diameter of the tool head base 201 is larger than the diameter of the connecting shaft 203. A disc 207 is integrally formed on the end face of the tool head base 201 facing the connecting shaft 203. One end of the connecting shaft 203 is connected to the disc 207. The side of the disc 207 facing the connecting shaft 203 forms the aforementioned limiting surface, the diameter of which is larger than the outer diameter of the bearing 10. Furthermore, an external thread 205 is provided on the circumferential surface of the end of the connecting shaft 203 away from the tool head base 201, and an internal thread 401 matching the external thread 205 is provided on the inner circumferential surface of the fastening ring 4.

[0044] Thus, when installing sleeve 3, first install bearing 10 onto the circumferential surface of connecting shaft 203, then assemble sleeve 3 onto the outer ring of bearing 10, ensuring that the right end face of sleeve 3 is in contact with the end face of disk 207, which is the aforementioned limiting surface. Next, screw fastening ring 4 onto the end of connecting shaft 203 and tighten it, so that fastening ring 4 is in contact with sleeve 3. In this way, sleeve 3 is restricted between fastening ring 4 and disk 207, and cannot move along the axial direction of connecting shaft 203, but can only rotate relative to connecting shaft 203, ensuring the stability of sleeve 3.

[0045] Furthermore, when the guide block 5 on the sleeve 3 wears out severely, the sleeve 3 can be easily removed and replaced with a new one at any time.

[0046] In this embodiment, as Figure 3 and Figure 6 As shown, multiple mounting grooves 301 are evenly distributed around the axis of the sleeve 3. The mounting grooves 301 are elongated, and their length direction is the same as the axis of the sleeve 3. Multiple threaded holes 302 are formed on the inner wall of each mounting groove 301. Correspondingly, multiple countersunk holes 501, each corresponding to a threaded hole 302, are arranged along the length of each guide block 5. When installing the guide block 5, it can be inserted into the mounting groove 301 on the circumference of the sleeve 3, and then countersunk bolts are screwed into the countersunk holes 501 and tightened until the bolt head of the countersunk bolt is fully inserted into the countersunk hole 501 of the guide block 5.

[0047] Since the guide block 5 is fixed to the circumferential surface of the sleeve 3 by countersunk bolts, it is convenient to replace the guide block 5 in the future.

[0048] In some embodiments, the guide block 5 is a metal guide block 5 or a plastic guide block 5. Preferably, a plastic guide block 5 is selected.

[0049] In addition, in this embodiment, two bearings 10 are provided, and the outer rings of the two bearings 10 are respectively assembled on both sides inside the sleeve 3 to improve the stability of the sleeve 3.

[0050] In this embodiment, as Figure 5 As shown, the cutter head base 201 has multiple slots 204 penetrating through it along its radial direction, and the multiple slots 204 are arranged along the axial direction of the cutter head base 201. Figure 4 As shown, a locking bolt hole 206 extending radially along the circumferential surface of the cutter head base 201 is provided. The locking bolt hole 206 and the slot 204 correspond one-to-one, and the locking bolt hole 206 and the corresponding slot 204 are connected.

[0051] like Figure 3 As shown, the cutter head assembly includes a cutter shank 6, a cutter head 7, and a first bolt 8. The first end of the cutter shank 6 is inserted radially into and passes through the slot 204 along the cutter head base 201, while its second end extends into the slot 204. A cutter head mounting groove 602 is formed at the first end of the cutter shank 6, and the cutter head 7 is locked into the cutter head mounting groove 602 by the first bolt 8. A second bolt 9 is provided in the locking bolt hole 206, and the cutter shank 6 is locked into the slot 204 by the second bolt 9.

[0052] It should be noted that traditional broaching tools are generally equipped with only one cutting head 7, and a single cutting head 7 can bore about 1mm each time. Therefore, the cutting head 7 needs to be replaced frequently to complete the boring work.

[0053] In this embodiment, in order to improve the boring efficiency, a cutter head assembly is installed on each slot 204, and the cutter bars 6 in the multiple cutter head assemblies are distributed in a stepped manner along the axis of the cutter head base 201.

[0054] More specifically, such as Figure 5 As shown, from left to right, the height of the tool holder 6 gradually increases, meaning the height of the bottom surface of the tool holder 6 gradually increases. Therefore, after installing multiple tool heads 7 of the same specification onto multiple tool holders 6 one by one, as... Figure 2 As shown, the height of the cutter head 7 gradually increases from the connecting shaft 203 to the connecting tube 202. That is, Figure 2 The leftmost cutter head 7 has the lowest height, while the rightmost cutter head 7 has the highest height. In other words, along the direction from the connecting shaft 203 to the connecting tube 202, the distance between the cutter head 7 and the axis of the cutter head base 201 of the cutter head assembly gradually decreases.

[0055] Furthermore, in the direction from the connecting shaft 203 to the connecting tube 202, among two adjacent cutter heads 7, the latter cutter head 7 is 1mm higher than the former cutter head 7.

[0056] Since the latter cutter head 7 is 1mm higher than the former cutter head 7 in any two adjacent cutter heads 7, and there are multiple cutter heads 7, the machining workload of moving to one side at a time is increased, thus improving efficiency.

[0057] In this embodiment, there is no specific limit to the number of cutter head assemblies. The number of cutter head assemblies can be reasonably selected according to the hardness of different products. For example, when boring products with lower hardness, the number of cutter head assemblies can be appropriately increased, and when boring products with higher hardness, the number of cutter head assemblies can be appropriately reduced.

[0058] In this embodiment, as Figure 4 As shown, the cutter head mounting groove 602 matches the shape of the cutter head 7. When the cutter head 7 is inserted into the cutter head mounting groove 602, the bottom of the cutter head 7 is exposed, while the rest is embedded in the cutter head mounting groove 602. In addition, the cutter head mounting groove 602 is provided with a fixing bolt hole 601 that matches the first bolt 8. The cutter head 7 can be locked and fixed onto the cutter head mounting groove 602 by means of the first bolt 8.

[0059] In some embodiments, each slot 204 corresponds to two locking bolt holes 206, such as Figure 4 As shown, the two locking bolt holes 206 are arranged vertically. The tool holder 6 is secured using two second bolts 9, ensuring its stability.

[0060] In some embodiments, such as Figure 2 and Figure 3 As shown, the inner wall of the connecting pipe 202 is provided with a threaded groove, while the end of the boring bar main rod 1 is provided with a thread. In this way, the connecting pipe 202 and the boring bar main rod 1 can be threadedly connected, which facilitates installation and disassembly.

[0061] When assembling this deep hole reaming tool, first install the bearing 10 onto the circumferential surface of the connecting shaft 203, then assemble the sleeve 3 onto the outer ring of the bearing 10, and then screw the retaining ring 4 onto the end of the connecting shaft 203 and tighten it so that the retaining ring 4 fits against the sleeve 3. During broaching, first pass the boring bar 1 through the steel pipe to be processed, then thread the connecting pipe 202 of the deep hole reaming tool onto the free end of the boring bar 1 of the broaching machine, and then the broaching machine drives the boring bar 1 to perform the broaching operation.

[0062] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A deep hole counter boring tool characterized by, It includes a fastening ring (4), a sleeve (3), a tool mounting base (2), and at least one tool head assembly; the tool mounting base (2) has a connecting pipe (202), a tool head base (201), and a connecting shaft (203) connected in sequence, and a limiting surface for limiting the sleeve (3) is formed between the connecting shaft (203) and the tool head base (201); A sleeve (3) is rotatably mounted on the connecting shaft (203) via a bearing (10). The end face of the sleeve (3) is close to the limiting surface. The fastening ring (4) is threaded to the end of the connecting shaft (203) away from the cutter head base (201), and the fastening ring (4) is located on the side of the sleeve (3) away from the connecting pipe (202). The fastening ring (4) cooperates with the limiting surface to restrict the movement of the sleeve (3) along the axial direction of the connecting shaft (203). The sleeve (3) has multiple mounting grooves (301) around its axis on its outer circumferential surface, and each mounting groove (301) is equipped with a guide block (5); The connecting pipe (202) is detachably connected to the boring bar main rod (1), the cutting head assembly is detachably installed on the cutting head base (201), and the cutting head assembly is arranged along the radial direction of the cutting head base (201).

2. A deep hole bore expanding tool according to claim 1, wherein The connecting shaft (203) has an external thread (205) on the circumferential surface of the end away from the cutter head base (201), and the fastening ring (4) has an internal thread (401) on the inner circumferential surface that matches the external thread (205).

3. A deep hole boring tool according to claim 1, wherein Two bearings (10) are provided, and the two bearings (10) are respectively located on the inner walls of both sides of the sleeve (3).

4. A deep hole bore expanding tool according to claim 3, wherein The cutter head assembly includes a cutter bar (6), a cutter head (7), and a first bolt (8); the cutter head base (201) has a slot (204) that passes through the cutter head base (201) along its radial direction, and a locking bolt hole (206) corresponding to the slot (204) is opened on the circumferential surface of the cutter head base (201), and the slot (204) and the corresponding locking bolt hole (206) are connected; the first end of the cutter bar (6) passes through the slot (204) and is exposed to the external environment, and its second end is located inside the slot (204). A second bolt (9) is provided in the locking bolt hole (206), and the cutter bar (6) is locked in the slot (204) by the second bolt (9). The cutter head (7) is fixed to the first end of the cutter bar (6) by the first bolt (8).

5. A deep hole bore expanding tool according to claim 4, wherein The cutter head base (201) is provided with a plurality of slots (204), which are arranged along the axial direction of the cutter head base (201); a plurality of cutter head assemblies are provided, which are arranged in a stepped manner along the axial direction of the cutter head base (201); along the direction from the connecting shaft (203) to the connecting pipe (202), the distance between the cutter head (7) of the cutter head assembly and the axial direction of the cutter head base (201) gradually decreases.

6. A deep hole bore expanding tool according to claim 5, wherein The absolute value of the distance difference between any two adjacent cutter heads (7) and the axis of the cutter head base (201) is the same.

7. A deep hole bore expanding tool according to claim 5, wherein Each of the slots (204) corresponds to two locking bolt holes (206).

8. A deep hole reaming tool according to claim 1, characterized in that, The guide block (5) is a plastic block.

9. The deep hole boring tool according to claim 1, wherein The connecting pipe (202) is threadedly connected to the boring bar main rod (1).

10. The deep hole boring tool according to claim 4, wherein The end of the cutter bar (6) is provided with a cutter head mounting groove (602), and a fixing bolt hole (601) adapted to the first bolt (8) is provided in the cutter head mounting groove (602).

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