Diamond tool with buffering function

Abstract

This invention relates to the field of diamond cutting tool technology and discloses a diamond cutting tool with a buffer function, including a tool shank. A buffer cavity is formed within the tool shank's inner cavity. Limiting rods are fixedly connected to both sides of the buffer cavity. A limiting boss is fixedly connected to one side of the buffer cavity, and a left buffer pad is fixedly connected to one side of the limiting boss. This invention, by creating a buffer cavity inside the tool shank and incorporating limiting rods, limiting bosses, a buffer pad, and a buffer spring within the buffer cavity, along with a buffer support plate that can slide on the limiting rods, allows the axial impact load on the diamond cutting tool to be transferred to the buffer spring via a connecting piece and the buffer support plate. The spring's compression deformation absorbs and dissipates the impact energy, effectively solving the problem of unreleased impact stress at the tool tip under traditional rigid locking structures. This reduces the risk of brittle diamond layer chipping and peeling, and extends the tool's service life.

Description

Technical Field

[0001] This invention relates to the field of diamond cutting tool technology, and more particularly to a diamond cutting tool with a buffer function. Background Technology

[0002] Diamond cutting tools are high-performance special cutting tools developed specifically for high-hardness, brittle, and difficult-to-machine materials in the field of industrial precision machining. Their core materials are divided into three categories: natural diamond single crystal, polycrystalline diamond (PCD), and chemical vapor deposition (CVD) diamond coating. Natural diamond single crystal tools are made by fixing natural diamond single crystals, after directional crystal selection, to the cutting edge of the tool holder through special brazing and bonding processes. Polycrystalline diamond tools are made by sintering micron-sized diamond particles into dense polycrystalline blocks under high temperature and high pressure and then combining them with cemented carbide tool bodies. CVD diamond coated tools are made by depositing a diamond film several microns thick on the surface of cemented carbide or ceramic tool bodies to improve the cutting edge performance.

[0003] Existing diamond cutting tools still have some problems during use. For example, traditional diamond cutting tools often use a rigid locking structure between the insert and the tool holder, with the insert directly fixed to the tool holder mounting base. There is no axial elastic allowance between the two. When intermittent cutting, machining hard points, or encountering sudden changes in cutting force, the instantaneous impact load on the tool tip cannot be effectively buffered and absorbed. This impact stress is directly transmitted to the brittle diamond layer, which can easily lead to tool tip chipping, peeling, or even overall fracture, seriously affecting tool life and the quality of the machined surface.

[0004] To address these issues, we provide a diamond cutting tool with a buffer function. Summary of the Invention

[0005] The technical problem to be solved by this invention is that the existing technology has the disadvantage of lacking an effective buffer structure between the tool holder and the cutting tool. To this end, we propose a diamond cutting tool with a buffer function.

[0006] To achieve the above objectives, this application adopts the following technical solution: a diamond cutting tool with a buffer function, comprising a tool shank, a buffer cavity being formed in the inner cavity of the tool shank, limit rods being fixedly connected to both sides of the inner cavity of the buffer cavity, a limit boss being fixedly connected to one side of the inner cavity of the buffer cavity, a left buffer pad being fixedly connected to one side of the limit boss, a buffer support plate being slidably connected to the surface of the limit rods, a right buffer pad being fixedly connected to one side of the buffer support plate, a buffer spring being sleeved on the surface of the limit rods, the two ends of the buffer spring being fixedly connected to one side of the right buffer pad and the left buffer pad respectively, a connecting piece being fixedly connected to one side of the buffer support plate, a mounting base being fixedly connected to one end of the tool shank, a waist-shaped through hole being formed at the top and bottom of the mounting base, a mounting sleeve being slidably connected to the inner cavity of the waist-shaped through hole, a clamping bolt being threadedly connected to the inner cavity of the mounting sleeve, and the surface of the clamping bolt being slidably connected to the inner cavity of the waist-shaped through hole.

[0007] Preferably, a diamond blade is slidably connected to the inner cavity of the mounting base, and abutment pieces are fixedly connected to both sides of the diamond blade, with one side of the abutment piece contacting the side of the connecting piece.

[0008] Preferably, the abutment plate has a threaded hole at its top, and one end of the clamping bolt is threadedly connected to the inner cavity of the threaded hole.

[0009] Preferably, the inner cavity of the waist-shaped through hole is provided with a sliding groove on both sides, and the surface of the mounting sleeve is slidably connected to the inner cavity of the sliding groove by a slider.

[0010] Preferably, one end of the tool holder is fixedly connected to a tool holder mounting head for positioning, assembling, and clamping the entire tool with the machine tool holder.

[0011] Preferably, both the left and right buffer pads are made of polyurethane elastomer or nitrile rubber, with a hardness range of Shore A 85~95 degrees.

[0012] Preferably, the buffer spring has a pre-compression amount in the free state, and the initial elastic force generated by the pre-compression amount is greater than the total weight of the buffer plate and all floating components connected to it, which is used to eliminate axial movement gap in the non-cutting state.

[0013] The technical effects and advantages of this invention are as follows: 1. This invention creates a buffer cavity inside the tool holder, and sets a limiting rod, a limiting boss, a buffer pad, and a buffer spring inside the buffer cavity. With the help of a buffer support plate that can slide on the limiting rod, the axial impact load on the diamond cutting tool can be transferred to the buffer spring through the connecting piece and the buffer support plate. The impact energy is absorbed and dissipated by the compression deformation of the spring. This effectively solves the problem of the tool tip impact stress having nowhere to be released under the traditional rigid locking structure, reduces the risk of brittle diamond layer chipping and peeling, and extends the tool's service life.

[0014] 2. This invention creates a waist-shaped through hole on the mounting base and slides a mounting sleeve within the through hole to engage with a clamping bolt. This allows the diamond cutting tool, abutment plate, buffer plate, mounting sleeve, and clamping bolt to form a synchronously axially linked floating assembly. This ensures that the cutting tool can freely retract axially according to the magnitude of the impact load during cutting, while the constant thread engagement between the clamping bolt and the mounting sleeve ensures the locking rigidity of the cutting tool. This achieves an organic unity between impact buffering and cutting stability, improving the machining reliability and surface quality consistency of the tool under intermittent cutting and variable load conditions. Attached Figure Description

[0015] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a three-dimensional view of a diamond cutting tool with a buffer function.

[0016] Figure 2 This is a cross-sectional view of the tool holder in a diamond tool with a buffer function.

[0017] Figure 3 This is a schematic diagram of the cross-section of the tool holder in a diamond tool with a buffer function.

[0018] Figure 4 This is an exploded view of the internal structure of the tool holder and mounting base in a diamond tool with a buffer function.

[0019] Figure 5 An exploded view of the mounting base and diamond cutting tool in a diamond cutting tool with a buffer function.

[0020] Legend: 1. Tool holder; 2. Buffer chamber; 3. Limiting rod; 4. Limiting boss; 5. Left buffer pad; 6. Buffer support plate; 7. Right buffer pad; 8. Buffer spring; 9. Connecting piece; 10. Mounting base; 11. Waist-shaped through hole; 12. Mounting sleeve; 13. Clamping bolt; 14. Diamond cutting tool; 15. Abutment piece; 16. Threaded hole; 17. Slide groove; 18. Tool holder mounting head. Detailed Implementation

[0021] According to the technical solution of the present invention, without changing the essential spirit of the present invention, those skilled in the art can propose various interchangeable structural methods and implementations. Therefore, the following detailed embodiments and accompanying drawings are merely exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction of the technical solution of the present invention. Example

[0022] Please see Figures 1-5This invention relates to a diamond cutting tool with a buffer function, comprising a tool holder 1, a buffer cavity 2 formed in the inner cavity of the tool holder 1, limit rods 3 fixedly connected to both sides of the inner cavity of the buffer cavity 2, a limit boss 4 fixedly connected to one side of the inner cavity of the buffer cavity 2, a left buffer pad 5 fixedly connected to one side of the limit boss 4, a buffer support plate 6 slidably connected to the surface of the limit rods 3, a right buffer pad 7 fixedly connected to one side of the buffer support plate 6, a buffer spring 8 sleeved on the surface of the limit rods 3, the two ends of the buffer spring 8 being fixedly connected to one side of the right buffer pad 7 and the left buffer pad 5 respectively, a connecting piece 9 fixedly connected to one side of the buffer support plate 6, a mounting base 10 fixedly connected to one end of the tool holder 1, a waist-shaped through hole 11 formed at the top and bottom of the mounting base 10, a mounting sleeve 12 slidably connected to the inner cavity of the waist-shaped through hole 11, a clamping bolt 13 threadedly connected to the inner cavity of the mounting sleeve 12, and the surface of the clamping bolt 13 slidably connected to the inner cavity of the waist-shaped through hole 11.

[0023] Specifically: The buffer cavity 2 is axially formed inside the tool holder 1. Limiting rods 3 are fixedly installed parallel to the axial direction of the tool holder 1 between the inner walls of both sides of the buffer cavity 2. A limiting boss 4 is fixedly installed on the inner wall of the rear end of the buffer cavity 2. The left buffer pad 5 is fitted and fixed to the front end face of the limiting boss 4. The buffer support plate 6 is sleeved on the two limiting rods 3 and slides freely along their axial direction. The right buffer pad 7 is fixed to the rear end face of the buffer support plate 6 and is positioned opposite to the left buffer pad 5. A buffer spring 8 is sleeved outside the limiting rods 3 and clamped between the left buffer pad 5 and the right buffer pad 7, with its two ends fixed to the left buffer pad 5 and the right buffer pad 7 respectively. The buffer plate 6 is fixedly connected to the front end of the connecting piece 9 and extends to the mounting base 10. The mounting base 10 is fixed to the front end of the tool bar 1. The waist-shaped through hole 11 is opened axially on the upper and lower walls of the mounting base 10. The mounting sleeve 12 is slidably embedded in the waist-shaped through hole 11 and can slide freely in its length direction. The clamping bolt 13 is screwed into the mounting sleeve 12 and its screw passes through the waist-shaped through hole 11. A sliding gap is maintained between the outer wall of the screw of the clamping bolt 13 and the inner wall of the waist-shaped through hole 11 to ensure that the clamping bolt 13 can still move synchronously with the mounting sleeve 12 along the axial direction of the waist-shaped through hole 11 when it is tightened. Example

[0024] Please see Figures 1-5Based on embodiment 1, a diamond blade 14 is slidably connected to the inner cavity of the mounting base 10. Abutment pieces 15 are fixedly connected to both sides of the diamond blade 14. One side of the abutment piece 15 contacts the side of the connecting piece 9. A threaded hole 16 is opened on the top of the abutment piece 15. One end of the clamping bolt 13 is threadedly connected to the inner cavity of the threaded hole 16. A sliding groove 17 is opened on both sides of the inner cavity of the waist-shaped through hole 11. The surface of the mounting sleeve 12 is slidably connected to the inner cavity of the sliding groove 17 through a slider. A tool holder mounting head 18 is fixedly connected to one end of the tool holder 1 for positioning, assembling and clamping the tool body with the machine tool holder. The left buffer pad 5 and the right buffer pad 7 are both made of polyurethane elastomer or nitrile rubber with a hardness range of Shore A 85~95 degrees. The buffer spring 8 has a pre-compression amount in the free state. The initial elastic force generated by this pre-compression amount is greater than the total weight of the buffer support plate 6 and all floating parts connected to it, which is used to eliminate axial movement clearance in the non-cutting state.

[0025] Specifically: A diamond blade 14 is slidably embedded in the front groove of the mounting base 10. Abutment pieces 15 are fixedly connected to the two side walls of the diamond blade 14. The rear end face of the abutment piece 15 and the front end face of the connecting piece 9 fit together to achieve effective transmission of axial impact force. The threaded hole 16 on the top of the abutment piece 15 is threaded with the end of the clamping bolt 13, fixing the blade, abutment piece 15, connecting piece 9, buffer plate 6, mounting sleeve 12 and clamping bolt 13 into a synchronous axially linked floating whole. The inner wall of the waist-shaped through hole 11 has axially grooved grooves 17 on both sides. The outer wall of the mounting sleeve 12 is fitted into the slide groove 17 through a protruding slider to achieve smooth guiding and sliding. The rear end of the tool holder 1 is fixedly connected to a tapered tool holder mounting head 18 for positioning and clamping assembly with the machine tool spindle tool holder. The left buffer pad 5 and the right buffer pad 7 are both made of polyurethane elastomer or nitrile rubber and the Shore A hardness is controlled between 85 and 95 degrees. The buffer spring 8 has a pre-compression amount in the free state and its initial elastic force is greater than the total weight of all floating parts, so as to eliminate the axial movement gap caused by gravity or vibration in the non-cutting state and ensure the axial positioning accuracy of the tool.

[0026] Working principle: In the assembled state, the diamond insert 14 is embedded in the groove at the front end of the mounting base 10. The rear end face of the abutment piece 15 on both sides of the insert is in contact with the front end face of the connecting piece 9 which is fixed to the front end of the buffer plate 6. After the clamping bolt 13 passes through the waist-shaped through hole 11 and the mounting sleeve 12 at the upper end of the tool bar 1, its end is screwed into the threaded hole 16 at the top of the abutment piece 15, thus fixing the diamond insert 14, abutment piece 15, connecting piece 9, buffer plate 6, mounting sleeve 12 and clamping bolt 13 into a floating whole that can slide synchronously along the axial direction in the inner cavity of the tool bar 1.

[0027] In the non-cutting state, the buffer spring 8 generates an initial elastic force due to its pre-compression. This elastic force pushes the buffer support plate 6 forward through the right buffer pad 7, keeping the connecting piece 9 and the abutment piece 15 in close contact. Simultaneously, it eliminates the axial free movement gap of the floating assembly, ensuring the stable position of the tool tip relative to the tool holder 1. At this time, the screw portion of the clamping bolt 13 passing through the oblong through hole 11 is at the foremost position of the oblong through hole 11. When the tool performs cutting, the tool tip is subjected to an axial impact load from the workpiece. This load is transmitted to the connecting piece 9 via the abutment piece 15, which in turn pushes the buffer support plate 6 to slide rearward along the limit rod 3. During the rearward movement of the buffer support plate 6, it squeezes the right buffer pad 7, which in turn compresses the buffer spring 8. The spring is compressed while simultaneously releasing the impact... Impact energy is converted into elastic potential energy and temporarily stored. During compression, the left buffer pad 5 and the right buffer pad 7 convert part of the vibration energy into heat energy through the hysteresis effect of their viscoelastic materials. When the impact load disappears, the buffer spring 8 releases elastic potential energy, pushing the buffer plate 6 to drive the entire floating assembly to slide and reset to the front end until it returns to the initial position. This completes a full cycle of impact absorption, energy dissipation, and automatic reset. Throughout the entire process, the thread engagement between the clamping bolt 13 and the mounting sleeve 12 remains constant. The screw of the clamping bolt 13 only slides axially in the waist-shaped through hole 11 without radial oscillation. This ensures that the locking stiffness of the blade does not decrease during buffering and that the blade can accurately reset to the original machining position after each impact.

[0028] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A diamond cutting tool with a buffer function, comprising a tool holder (1), characterized in that: The inner cavity of the cutter bar (1) is provided with a buffer cavity (2). Limiting rods (3) are fixedly connected to both sides of the inner cavity of the buffer cavity (2). A limiting boss (4) is fixedly connected to one side of the inner cavity of the buffer cavity (2). A left buffer pad (5) is fixedly connected to one side of the limiting boss (4). A buffer support plate (6) is slidably connected to the surface of the limiting rod (3). A right buffer pad (7) is fixedly connected to one side of the buffer support plate (6). A buffer spring (8) is sleeved on the surface of the limiting rod (3). The two ends of the buffer spring (8) are... The buffer plate (6) is fixedly connected to one side of the right buffer pad (7) and the left buffer pad (5). A connecting piece (9) is fixedly connected to one side of the buffer plate (6). A mounting base (10) is fixedly connected to one end of the knife bar (1). The mounting base (10) has a waist-shaped through hole (11) at the top and bottom. A mounting sleeve (12) is slidably connected to the inner cavity of the waist-shaped through hole (11). A clamping bolt (13) is threadedly connected to the inner cavity of the mounting sleeve (12). The surface of the clamping bolt (13) is slidably connected to the inner cavity of the waist-shaped through hole (11).

2. A diamond cutting tool with a buffer function according to claim 1, characterized in that: The mounting base (10) has a diamond blade (14) slidably connected to its inner cavity. Both sides of the diamond blade (14) are fixedly connected to abutment pieces (15), and one side of the abutment piece (15) contacts the side of the connecting piece (9).

3. A diamond cutting tool with a buffer function according to claim 2, characterized in that: The top of the abutment piece (15) is provided with a threaded hole (16), and one end of the clamping bolt (13) is threadedly connected to the inner cavity of the threaded hole (16).

4. A diamond cutting tool with a buffer function according to claim 1, characterized in that: The inner cavity of the waist-shaped through hole (11) is provided with sliding grooves (17) on both sides, and the surface of the mounting sleeve (12) is slidably connected to the inner cavity of the sliding grooves (17) by a slider.

5. A diamond cutting tool with a buffer function according to claim 1, characterized in that: One end of the tool holder (1) is fixedly connected to a tool holder mounting head (18), which is used for positioning and clamping the tool body with the machine tool holder.

6. A diamond cutting tool with a buffer function according to claim 1, characterized in that: The left buffer pad (5) and the right buffer pad (7) are both made of polyurethane elastomer or nitrile rubber, with a hardness range of Shore A 85~95 degrees.

7. A diamond cutting tool with a buffer function according to claim 1, characterized in that: The buffer spring (8) has a pre-compression amount in the free state. The initial elastic force generated by this pre-compression amount is greater than the total weight of the buffer plate (6) and all floating components connected to it, which is used to eliminate axial movement gap in the non-cutting state.

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