PCBN cutter assembly

Abstract

The utility model relates to the technical field of superhard cutting tools, and discloses a PCBN tool assembly which comprises a boring tool bar and a boring tool handle detachably installed at the bottom end of the boring tool bar, an installation base is installed at one end of the boring tool bar, a tool body is installed in the installation base, an installation mechanism is arranged in the tool body, and the installation mechanism is connected with the boring tool bar. According to the utility model, the mounting mechanisms are arranged, the mounting mechanisms are matched with each other, and an axial and circumferential double-locking structure is adopted, so that the clamping stability of the tool main body can be obviously improved, and the loosening caused by cutting vibration is avoided; the boring machining precision and the cutting safety are guaranteed, the double locking is matched with the transmission self-locking structure, the cutter body is effectively prevented from moving and deflecting, the connection rigidity is improved, heavy-load intermittent cutting is adapted, and the service life of the PCBN cutter is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of superhard cutting tool technology, specifically a PCBN tool assembly. Background Technology

[0002] Due to their high hardness, high wear resistance and good thermal stability, PCBN tools are widely used in the precision boring of difficult-to-machine materials such as hardened steel and alloy cast iron. Most existing PCBN tool assemblies for boring machines adopt a separate structure of tool holder, tool base and insert, and the tool base and tool holder are fastened together by bolts, set screws or threaded pairs.

[0003] In practical use, the existing technology uses only a single locking structure for the tool body, which cannot achieve dual locking in both the axial and circumferential directions. Under heavy load and intermittent boring conditions, it is prone to loosening, slippage, or runout, making it difficult to guarantee the boring machining accuracy and stability. At the same time, the single locking structure is cumbersome to disassemble and assemble, has low replacement efficiency, and is prone to fastener stripping, corrosion, and seizing after long-term use, which seriously affects the reliability of the tool and cannot meet the high-precision, high-efficiency, and high-stability machining requirements of CNC boring machines.

[0004] To address the above issues, a PCBN tool assembly is proposed. Utility Model Content

[0005] This utility model provides a PCBN tool assembly with a dual locking structure in both the axial and circumferential directions, which can significantly improve the clamping stability of the tool body, avoid loosening caused by cutting vibration, and ensure the boring machining accuracy and cutting safety, thus solving the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: a PCBN tool assembly, including a boring bar shank and a boring bar holder detachably mounted at the bottom end of the boring bar shank. A mounting base is installed at one end of the boring bar shank, and a tool body is installed inside the mounting base. A mounting mechanism is provided inside the tool body, and the mounting mechanism can conveniently install the mounting base and the tool body.

[0007] Preferably, the mounting mechanism includes a positioning hole formed inside the mounting base and a positioning block disposed inside the positioning hole. The positioning hole has a threaded groove inside. The positioning block has a threaded rail on its outer side. A positioning frame is mounted on the inner side of the positioning block. Three sets of screws are mounted on the inner side of the positioning frame. A rotating gear is mounted on one end of each screw. A drive gear is mounted on the inner side of the rotating gear. A rotating rod is mounted on one end of the drive gear. The rotating rod extends to the outer side of the positioning block. A threaded sleeve is fitted on the outer wall of the screw. A hinge rod is hinged to one end of the threaded sleeve. A support arm is hinged to one end of the positioning frame. One end of the hinge rod is hinged to one end of the support arm. A positioning wheel is mounted on one end of the support arm.

[0008] Preferably, a limiting groove is formed on the inner side of the positioning frame, and a limiting block is provided inside the limiting groove. One end of the limiting block is connected to one end of the threaded sleeve.

[0009] Preferably, the cross-section of the limiting groove is larger than the cross-section of the limiting block, and the limiting groove and the limiting block form a sliding structure.

[0010] Preferably, the limiting blocks are provided in three sets, and the three sets of limiting blocks are mutually adapted to the threaded sleeve.

[0011] Preferably, the positioning wheel in the mounting mechanism is made of an elastic and wear-resistant material, the outer wall of the positioning wheel has an arc-shaped structure, and the positioning wheel and the inner wall of the tool body are in flexible contact.

[0012] Preferably, the transmission ratio between the drive gear and the three sets of rotating gears is 1:1, the three sets of screws are distributed in a ring at equal intervals with the axis of the drive gear as the center, and the screws and the threaded sleeves are fitted with high-precision fine-pitch threads.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model, by setting up an installation mechanism and utilizing the mutual cooperation between the installation mechanisms, adopts a dual locking structure in both axial and circumferential directions, which can significantly improve the clamping stability of the tool body, avoid loosening caused by cutting vibration, and ensure the boring machining accuracy and cutting safety.

[0015] 2. The dual locking mechanism combined with the transmission self-locking structure effectively prevents the tool body from moving or swaying, improves connection rigidity, is suitable for heavy-duty intermittent cutting, and extends the service life of PCBN tools. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the boring tool of this utility model.

[0017] Figure 2 This is a schematic diagram of the installation mechanism of this utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the installation mechanism of this utility model.

[0019] Figure 4 For the present utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Boring tool holder; 2. Boring tool shank; 3. Mounting base; 4. Tool body; 5. Mounting mechanism; 51. Positioning hole; 52. Positioning block; 53. Threaded rail; 54. Positioning frame; 55. Screw; 56. Rotating gear; 57. Drive gear; 58. Rotating rod; 59. Threaded sleeve; 510. Hinge rod; 511. Support arm; 512. Positioning wheel; 513. Limiting groove; 514. Limiting block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This embodiment aims to facilitate a solution to the problem of inconvenience in double-locking the tool body 4. Please refer to [link / reference]. Figures 1-4 A PCBN tool assembly includes a boring bar shank 1 and a boring bar holder 2 detachably mounted to the bottom of the boring bar shank 1. A mounting base 3 is mounted at one end of the boring bar shank 1. A tool body 4 is mounted inside the mounting base 3. A mounting mechanism 5 is provided inside the tool body 4. The mounting mechanism 5 allows for convenient installation of the mounting base 3 and the tool body 4, and provides double locking to the tool body 4, enabling quick assembly and disassembly of the mounting base 3 and the tool body 4, ensuring tool positioning accuracy and clamping stability. The tool body 4 includes a cemented carbide support substrate, a gradient transition layer, a PCBN working layer, a cutting edge strengthening structure, and a stress relief groove. Through multi-layer composite, gradient transition, stress dispersion, and cutting edge passivation, it achieves [the desired effect]. Strengthening the synergy of the reinforcing ribs significantly improves the resistance to chipping, fracture, and thermal shock under interrupted cutting and heavy-load machining, extending tool life and improving machining stability. The cemented carbide support matrix can be ultrafine-grained WC-Co with 5–10 wt% Co, offering high strength and toughness. The gradient transition layer can be multi-layered or have a compositional gradient transition to alleviate thermal mismatch, reduce interfacial stress, and improve bonding strength and peel resistance. The PCBN working layer improves toughness by combining grains, balancing hardness and toughness. The edge strengthening structure includes passivation and micro-beveling to disperse cutting forces, suppress chipping, and adapt to interrupted cutting. The stress relief grooves are grooves at the interface and the root of the cutting edge to eliminate stress concentration, inhibit crack initiation and propagation, and improve the fracture resistance of the matrix.

[0023] Please see Figures 3-4 The mounting mechanism 5 includes a positioning hole 51 inside the mounting base 3 and a positioning block 52 inside the positioning hole 51. The positioning hole 51 has a threaded groove inside. A threaded rail 53 is provided on the outer side of the positioning block 52. A positioning frame 54 is mounted on the inner side of the positioning block 52. Three sets of screws 55 are mounted on the inner side of the positioning frame 54. A rotating gear 56 is mounted on one end of each screw 55. A drive gear 57 is mounted on the inner side of the rotating gear 56. A rotating rod 58 is mounted on one end of the drive gear 57. The rotating rod 58 extends to the outer side of the positioning block 52. A threaded sleeve is fitted on the outer wall of the screw 55. 59. A hinge rod 510 is hinged to one end of the threaded sleeve 59, and a support arm 511 is hinged to one end of the positioning frame 54. One end of the hinge rod 510 is hinged to one end of the support arm 511. A positioning wheel 512 is installed at one end of the support arm 511. The rotating rod 58 drives the drive gear 57 and the rotating gear 56 to rotate, and drives the screw 55 to move the threaded sleeve 59. The positioning wheel 512 moves through the hinge structure, so that the positioning wheel 512 contacts the inner wall of the tool body 4 and locks the tool body 4, realizing the rapid positioning and locking of the tool body 4.

[0024] Please see Figure 3 The positioning frame 54 has a limiting groove 513 on its inner side, and a limiting block 514 is set inside the limiting groove 513. One end of the limiting block 514 is connected to one end of the threaded sleeve 59. The limiting block 514 slides along the limiting groove 513 to guide and limit the movement of the threaded sleeve 59, ensuring that the engagement action is smooth and accurate.

[0025] Please see Figure 3 The cross-section of the limiting groove 513 is larger than the cross-section of the limiting block 514. The limiting groove 513 and the limiting block 514 form a sliding structure to avoid sliding offset and improve the coaxiality and repeatability of the tool installation.

[0026] Please see Figure 4 The limit block 514 is provided in three sets. The three sets of limit blocks 514 are adapted to each other with the threaded sleeve 59. The three sets of structures move synchronously, so that the tool is subjected to uniform force and the PCBN tool is improved in terms of impact resistance and heavy-duty cutting stability.

[0027] Please see Figure 4 The positioning wheel 512 in the mounting mechanism 5 is made of elastic wear-resistant material. The outer wall of the positioning wheel 512 has an arc-shaped structure, and the positioning wheel 512 and the inner wall of the tool body 4 are in flexible contact. This increases the contact friction to improve the circumferential locking and fastening, while buffering the cutting vibration impact, reducing hard wear, and extending the service life of the parts.

[0028] Please see Figure 3The transmission ratio between the drive gear 57 and the three sets of rotating gears 56 is 1:1. The three sets of screws 55 are distributed in a ring at equal intervals with the axis of the drive gear 57 as the center. The screws 55 and the threaded sleeves 59 are fitted with high-precision fine-pitch threads, which drive the three sets of screws 55 to rotate synchronously at the same speed. This causes the three sets of threaded sleeves 59 to move synchronously along the screws 55, ensuring that the locking force of the support arm 511 on the tool body 4 is evenly distributed, avoiding excessive local force that could cause the tool body 4 to wobble, and improving clamping stability.

[0029] In this embodiment: when it is necessary to install the tool body 4, the tool body 4 is placed inside the mounting base 3, and then the positioning block 52 is placed inside the positioning hole 51. The tool body 4 can be first fixed by the mutual cooperation between the threaded groove inside the positioning hole 51 and the threaded rail 53. Then, the rotating rod 58 is rotated to drive the drive gear 57 to rotate. Since the drive gear 57 and the rotating gear 56 mesh with each other, the rotating gear 56 drives the screw 55 to rotate. Under the limitation of the limiting groove 513 and the limiting block 514, the screw 55 drives the threaded sleeve 59 to move. Then, under the transmission of the hinge rod 510, the support arm 511 and the positioning wheel 512 are driven to move, so that the positioning wheel 512 comes into contact with the inner side of the tool body 4, and the tool body 4 is fixed a second time, making the tool body 4 more stable when in use.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A PCBN tool assembly, comprising a boring bar holder (1) and a boring bar shank (2) detachably mounted at the bottom end of the boring bar holder (1), characterized in that: One end of the boring bar (1) is equipped with a mounting base (3), and the tool body (4) is installed inside the mounting base (3). The tool body (4) is provided with a mounting mechanism (5) inside the tool body (4). The mounting mechanism (5) can conveniently install the mounting base (3) and the tool body (4).

2. The PCBN tool assembly according to claim 1, characterized in that: The mounting mechanism (5) includes a positioning hole (51) opened inside the mounting base (3) and a positioning block (52) disposed inside the positioning hole (51). The positioning hole (51) is provided with a threaded groove inside. The positioning block (52) is provided with a threaded rail (53) on the outside. A positioning frame (54) is installed on the inside of the positioning block (52). Three sets of screws (55) are installed on the inside of the positioning frame (54). A rotating gear (56) is installed at one end of the screw (55). An active mechanism is installed on the inside of the rotating gear (56). The gear (57) has a rotating rod (58) installed at one end of the driving gear (57), the rotating rod (58) extends to the outside of the positioning block (52), the outer wall of the screw (55) is fitted with a threaded sleeve (59), one end of the threaded sleeve (59) is hingedly fitted with a hinge rod (510), one end of the positioning frame (54) is hingedly fitted with a support arm (511), one end of the hinge rod (510) is hinged to one end of the support arm (511), and one end of the support arm (511) is fitted with a positioning wheel (512).

3. A PCBN tool assembly according to claim 2, characterized in that: The positioning frame (54) has a limiting groove (513) on its inner side, and a limiting block (514) is provided inside the limiting groove (513). One end of the limiting block (514) is connected to one end of the threaded sleeve (59).

4. A PCBN tool assembly according to claim 3, characterized in that: The cross-section of the limiting groove (513) is larger than the cross-section of the limiting block (514), and the limiting groove (513) and the limiting block (514) form a sliding structure.

5. A PCBN tool assembly according to claim 4, characterized in that: The limiting block (514) is provided in three sets, and the three sets of limiting blocks (514) are mutually adapted to the threaded sleeve (59).

6. A PCBN tool assembly according to claim 2, characterized in that: The positioning wheel (512) in the installation mechanism (5) is made of elastic wear-resistant material. The outer wall of the positioning wheel (512) has an arc-shaped structure, and the positioning wheel (512) and the inner wall of the tool body (4) are in flexible contact.

7. A PCBN tool assembly according to claim 2, characterized in that: The transmission ratio between the drive gear (57) and the three sets of rotating gears (56) is 1:

1. The three sets of screws (55) are distributed in a ring at equal intervals with the axis of the drive gear (57) as the center. The screws (55) and the threaded sleeves (59) are fitted with high-precision fine-tooth threads.

Images