A cemented carbide tool

Abstract

The present application relates to the technical field of metal cutting tools, and discloses a cemented carbide tool, which comprises a tool bar, a cemented carbide blade and a pressing assembly for locking and fixing the cemented carbide blade on the tool bar, and further comprises a buffer heat dissipation lining sheet clamped between the pressing assembly and the rake face of the cemented carbide blade. The cemented carbide tool, without changing the body structure and size of the standard cemented carbide tool, can be directly adapted to the existing general tool bar and blade, and retains complete standard interchangeability. The buffer heat dissipation lining sheet can disperse the impact stress of the tool tip, absorb part of the impact energy, effectively improve the anti-collapse performance of the tool, expand the heat dissipation and conduction path, accelerate the heat export of the tool tip, and relieve heat accumulation and thermal wear. The overall structure is simple, convenient to clamp, low in preparation cost, and the lining sheet can be reused, so that the service life of the tool under intermittent cutting conditions can be effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of metal cutting tool technology, and more particularly to a cemented carbide tool. Background Technology

[0002] Carbide indexable cutting tools are widely used in CNC turning, milling and other metal processing scenarios due to their high cutting efficiency, strong insert interchangeability and low maintenance cost. Under intermittent cutting conditions, the cutting tool tip periodically enters and exits the workpiece, and is subjected to high-frequency mechanical shock and alternating thermal shock at the same time. The stress concentration and heat accumulation in the cutting tool tip area are prominent problems, which can easily lead to early failure phenomena such as cutting tool tip breakage and excessive thermal wear, which significantly shortens the tool life.

[0003] Existing solutions to address the aforementioned issues primarily focus on optimizing the groove structure of the carbide insert itself, adjusting the alloy material formula, or upgrading the surface coating. These solutions all require modifications to the body structure or material of the carbide tool, which not only increases manufacturing costs but also undermines the universal interchangeability of standard tools. For standard carbide tools already in use, performance upgrades cannot be achieved through these solutions. Furthermore, solutions such as external cooling and internal cooling of the tool holder require additional equipment, resulting in high modification costs and making them unsuitable for small- to medium-batch machining scenarios. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in the prior art, the tool tip of the indexable carbide tool is prone to early chipping and thermal wear due to stress concentration and heat accumulation under intermittent cutting conditions. Existing improvement solutions often require modification of the tool body structure, which destroys standard interchangeability and has the disadvantage of high modification cost. Therefore, we propose a carbide tool.

[0005] To achieve the above objectives, this application adopts the following technical solution: a carbide cutting tool, including a tool shank, a carbide insert, and a clamping assembly for locking and fixing the carbide insert to the tool shank, and further including a buffer heat dissipation liner, wherein the buffer heat dissipation liner is clamped between the clamping assembly and the rake face of the carbide insert; the outer contour of the buffer heat dissipation liner is adapted to the non-cutting edge area of ​​the rake face of the carbide insert, and the buffer heat dissipation liner has a tip arc-shaped extension section coaxially arranged with the tip arc at the position corresponding to the tip arc, and a safety gap is left between the end of the tip arc-shaped extension section and the cutting edge of the carbide insert.

[0006] Preferably, the clamping assembly includes a clamping block and a locking screw, and a positioning pin is provided in the blade positioning groove of the tool bar; the center of the buffer heat dissipation liner has a central clearance hole coaxial with the central positioning hole of the carbide blade, and the positioning pin passes through the central clearance hole and the central positioning hole of the carbide blade in sequence; the locking screw is located at the tail of the clamping block, and when the locking screw is tightened, the front pressing surface of the clamping block presses against the upper surface of the buffer heat dissipation liner, thereby synchronously clamping and fixing the buffer heat dissipation liner and the carbide blade.

[0007] Preferably, the buffer heat dissipation pad has a plurality of micro-array heat-conducting bumps arranged on the side surface facing the carbide cutting edge, and each of the micro-array heat-conducting bumps abuts against the rake face of the carbide cutting edge.

[0008] Preferably, the microarray thermal conductive bumps are arranged in a ring along the radial direction of the blade tip arc, and the diameter of the microarray thermal conductive bumps is 0.04-0.06 mm and the height is 0.02-0.04 mm.

[0009] Preferably, the side of the buffer heat dissipation liner is integrally provided with an extended heat dissipation wing, which is fitted to the side surface of the tool holder.

[0010] Preferably, the overall thickness of the buffer heat dissipation liner is 0.2 to 0.3 mm, and the thickness tolerance is ±0.01 mm; the buffer heat dissipation liner is made of copper-molybdenum alloy or nickel-based thermally conductive and tough alloy.

[0011] The technical effects and advantages of this invention are as follows: In this invention, there is no need to modify the body structure and size of standard carbide cutting tools. It can be directly adapted to existing general-purpose tool holders and inserts, retaining complete standardization and interchangeability. The buffer heat dissipation liner can disperse the impact stress of the tool tip and absorb part of the impact energy, effectively improving the tool's resistance to chipping. At the same time, it expands the heat dissipation conduction path, accelerates the heat dissipation of the tool tip, and alleviates heat accumulation and thermal wear. The overall structure is simple, easy to clamp, has low manufacturing cost, and the liner can be reused, which can effectively extend the tool life under intermittent cutting conditions. Attached Figure Description

[0012] 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 schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is a top view schematic diagram of the buffer heat dissipation liner and cemented carbide cutting tool of the present invention. Figure 4 This is a schematic diagram of the bottom structure of the buffer heat dissipation liner of the present invention.

[0013] Legend: 1. Tool holder; 2. Carbide cutting tool; 3. Buffer heat dissipation liner; 31. Center clearance hole; 32. Curved extension of the tool tip; 33. Micro-array heat-conducting bumps; 34. Extended heat dissipation fins; 4. Clamping block; 5. Locking screw; 6. Locating pin. Detailed Implementation

[0014] 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.

[0015] Reference Figure 1 - Figure 4 As shown, the present invention provides a technical solution: a carbide cutting tool, including a tool holder 1, a carbide insert 2, a clamping assembly, and a buffer heat dissipation liner 3. Both the tool holder 1 and the carbide insert 2 are ISO standard indexable turning tool components. In this embodiment, the carbide insert 2 is an 80° rhomboid negative profile turning insert, and the tool holder 1 is a corresponding lever-clamping standard turning tool holder. The body structure, dimensional parameters, and positioning references of the carbide insert 2 and the tool holder 1 remain unchanged from their original standard forms.

[0016] The clamping assembly includes a clamping block 4 and a locking screw 5. A positioning pin 6 is fixedly installed in the blade positioning groove at the front end of the blade bar 1 to achieve radial positioning of the blade. The clamping block 4 is a lever-type pressure head structure, and the locking screw 5 is assembled at its tail. When the locking screw 5 is tightened, the front pressing surface of the clamping block 4 can be driven to swing downward, pressing and fixing the blade in the positioning groove.

[0017] The buffer heat dissipation liner 3 is clamped between the front pressing surface of the clamping block 4 and the rake face of the carbide insert 2. The outer contour of the buffer heat dissipation liner 3 is adapted to the non-cutting edge area of ​​the rake face of the carbide insert 2, ensuring that the liner does not cover the cutting edge and does not interfere with normal cutting operations. The buffer heat dissipation liner 3 is provided with a cutting edge arc extension 32 coaxial with the cutting edge arc at the position of the cutting edge arc. A safety gap of 0.1 to 0.15 mm is left between the end of the cutting edge arc extension 32 and the cutting edge of the carbide insert 2, so as to avoid contact with the cutting edge and affect the cutting performance while being close to the high heat and high stress area of ​​the cutting edge.

[0018] The buffer heat dissipation liner 3 has a central clearance hole 31 that is coaxial with the central positioning hole of the carbide insert 2. During installation, the positioning pin 6 on the tool holder 1 passes through the central clearance hole 31 and the central positioning hole of the carbide insert 2 from bottom to top, so as to achieve coaxial positioning of the buffer heat dissipation liner 3 and the carbide insert 2 and prevent the liner from radially shifting during clamping and cutting.

[0019] On the bottom surface of the buffer heat dissipation liner 3 facing the carbide cutting tool 2, a plurality of micro-array heat-conducting bumps 33 are arranged in the area corresponding to the cutting tip. In this embodiment, the plurality of micro-array heat-conducting bumps 33 are arranged in a ring along the radial direction of the cutting tip arc. The diameter of the micro-array heat-conducting bumps 33 is 0.04-0.06 mm and the height is 0.02-0.04 mm. Each micro-array heat-conducting bump 33 abuts against the rake face of the carbide cutting tool 2. The multi-point contact structure can not only disperse the concentrated stress of the cutting tip to the entire contact surface of the liner, but also absorb part of the impact energy through a small amount of elastic deformation, while ensuring the stability of the thermal contact.

[0020] The buffer heat dissipation liner 3 has an integrally formed extended heat dissipation fin 34 on its side. After assembly, the extended heat dissipation fin 34 is fitted to the side surface of the tool holder 1, extending the heat dissipation path from the blade area to the outside of the tool holder, thus expanding the convection heat dissipation area. The overall thickness of the buffer heat dissipation liner 3 is 0.2 to 0.3 mm, with a thickness tolerance controlled within ±0.01 mm. Adding the liner does not change the clamping height of the blade or the positioning accuracy of the tool tip. The buffer heat dissipation liner 3 is made of copper-molybdenum alloy or nickel-based thermally conductive and tough alloy, which has both high thermal conductivity and good impact toughness.

[0021] Working principle: During installation, first align the center clearance hole 31 of the buffer heat dissipation pad 3 with the positioning pin 6, then align the center hole of the carbide blade 2 with the positioning pin 6 and insert it into the positioning groove. Then tighten the locking screw 5, drive the clamping block 4 to swing downward, and simultaneously clamp and fix the buffer heat dissipation pad 3 and the carbide blade 2. The clamping process is completely consistent with that of standard tools and no additional operation is required.

[0022] Under intermittent cutting conditions, the tip of the carbide insert 2 is periodically subjected to mechanical impact and cutting heat. When the impact load is conducted from the tip to the insert body, it is dispersed to the entire contact area of ​​the buffer heat dissipation liner 3 through the micro-array thermal conductive bumps 33. At the same time, the liner itself absorbs part of the impact energy through ductile deformation, effectively reducing the peak stress in the tip area, alleviating stress concentration, and reducing the risk of tip breakage. The heat generated by cutting accumulates in the tip area and is quickly conducted to the highly thermally conductive buffer heat dissipation liner 3 through the micro-array thermal conductive bumps 33. Part of the heat is conducted to the tool holder 1 through the liner body and diffused outward, while the other part of the heat is directly dissipated through convection with the outside air via the extended heat dissipation fins 34. This adds a highly efficient heat dissipation channel in addition to the original heat dissipation path of the insert, reducing the operating temperature of the tip, slowing down thermal wear, and extending the tool life.

[0023] When the cutting edge of the carbide insert 2 is worn and needs to be indexed or replaced, loosen the locking screw 5 and lift the clamping block 4 to remove the buffer heat dissipation liner 3. After the insert is indexed or replaced, it can be re-clamped. The buffer heat dissipation liner 3 can be reused, resulting in low operating costs.

[0024] 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 carbide cutting tool, comprising a tool holder (1), a carbide insert (2), and a clamping assembly for locking and fixing the carbide insert (2) onto the tool holder (1), characterized in that: It also includes a buffer heat dissipation liner (3), which is clamped between the clamping assembly and the rake face of the carbide insert (2); the outer contour of the buffer heat dissipation liner (3) is adapted to the non-cutting edge area of ​​the rake face of the carbide insert (2); the buffer heat dissipation liner (3) is provided with a tip arc extension section (32) coaxially arranged with the tip arc at the position corresponding to the tip arc; a safety gap is left between the end of the tip arc extension section (32) and the cutting edge of the carbide insert (2).

2. The cemented carbide cutting tool according to claim 1, characterized in that: The clamping assembly includes a clamping block (4) and a locking screw (5). The blade positioning groove of the blade bar (1) is provided with a positioning pin (6). The center of the buffer heat dissipation liner (3) is provided with a central clearance hole (31) coaxial with the central positioning hole of the carbide blade (2). The positioning pin (6) passes through the central clearance hole (31) and the central positioning hole of the carbide blade (2) in sequence. The locking screw (5) is located at the tail of the clamping block (4). When the locking screw (5) is tightened, the front pressing surface of the clamping block (4) presses against the upper surface of the buffer heat dissipation liner (3), and the buffer heat dissipation liner (3) and the carbide blade (2) are simultaneously clamped and fixed.

3. A cemented carbide cutting tool according to claim 1, characterized in that: The buffer heat dissipation pad (3) has a plurality of micro-array heat-conducting bumps (33) arranged on one side surface facing the carbide blade (2) in the area corresponding to the blade tip. Each of the micro-array heat-conducting bumps (33) abuts against the rake face of the carbide blade (2).

4. A cemented carbide cutting tool according to claim 3, characterized in that: Several of the microarray thermally conductive bumps (33) are arranged in a ring along the radial direction of the blade tip arc. The diameter of the microarray thermally conductive bumps (33) is 0.04 to 0.06 mm and the height is 0.02 to 0.04 mm.

5. A cemented carbide cutting tool according to claim 1, characterized in that: The side of the buffer heat dissipation liner (3) is integrally provided with an extended heat dissipation wing (34), which is attached to the side surface of the tool holder (1).

6. A cemented carbide cutting tool according to claim 1, characterized in that: The overall thickness of the buffer heat dissipation liner (3) is 0.2 to 0.3 mm, and the thickness tolerance is ±0.01 mm; the buffer heat dissipation liner (3) is made of copper-molybdenum alloy or nickel-based thermally conductive and tough alloy.

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