A high wear resistant cemented carbide cutting tool

Abstract

The utility model provides a kind of hard alloy cutting tool of high wear resistance, including handle, the handle and tool bit integrally set together, and its both interior is provided with spiral cooling part and drainage cooling part, tool bit surface is provided with wear-resistant coating, and its interior is provided with transition cooling part;Handle setting injection cooling part and injection pipe orifice intercommunication, wherein handle setting drainage pipe orifice is communicated with drainage cooling part;The utility model is equipped with composite heat dissipation channel, spiral cooling part increases heat exchange, drainage part keeps flow circulation efficiency, reduces tool bit temperature and protects cutting tool;Cooling fluid flows in without touching workpiece, prevents thermal deformation, can also be recycled, and emission is more environmentally friendly.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, and in particular relates to a high wear-resistant cemented carbide cutting tool. Background Technology

[0002] In the field of machining, cutting tools are the core tools for achieving material cutting and shaping, and their performance directly affects machining efficiency, accuracy, and cost. Due to their high hardness, high wear resistance, and good red hardness, cemented carbide has become a commonly used material for manufacturing cutting tools and is widely used in metal cutting scenarios in industries such as automotive manufacturing, mold making, and aerospace.

[0003] However, existing carbide cutting tools still face many problems in practical use: On the one hand, during high-speed or intermittent cutting, the cutting edge and tool tip will generate a large amount of cutting heat due to intense friction. If the heat cannot be dissipated in time, the tool temperature will rise sharply, which will not only cause the hardness and toughness of the carbide substrate to decrease, but also accelerate the wear of the tool tip surface and even cause the cutting edge to chip, seriously shortening the tool life; On the other hand, the cooling structure of traditional tools is mostly a single straight channel or external cooling design, which has low cooling efficiency. The coolant is difficult to accurately act on the high-heat area of ​​the tool tip, and some cooling channels are not well adapted to the overall structure of the tool, which can easily lead to poor coolant flow and uneven heat dissipation, further aggravating the tool wear problem.

[0004] Therefore, it is essential to invent a highly wear-resistant cemented carbide cutting tool. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a high wear-resistant cemented carbide cutting tool, including a tool holder, a tool head, a wear-resistant coating, a spiral cooling section, a drain cooling section, a transition cooling section, a liquid injection cooling section, a liquid injection port, and a liquid discharge port. The tool holder and the tool head are integrally formed, and the spiral cooling section and the drain cooling section are disposed inside both of them. The surface of the tool head is provided with a wear-resistant coating, and the transition cooling section is disposed inside it. The liquid injection cooling section and the liquid injection port of the tool holder are interconnected, and the liquid discharge port of the tool holder is connected to the drain cooling section.

[0006] Preferably, both the tool holder and the tool head are tool structures made of high-hardness alloy, wherein the spiral cooling section and the drain cooling section inside both are connected through the transition cooling section.

[0007] Preferably, the spiral cooling section, the draining cooling section, the transition cooling section, and the injection cooling section are connected in sequence and together form a composite heat dissipation channel.

[0008] Preferably, the spiral cooling section is a spiral path cooling channel, with one end of the cutter head located inside connected to the inner end of the vertical drain cooling section through the transition cooling section, and the outer end of the drain cooling section connected to the drain pipe port provided on the cutter head.

[0009] Preferably, the axis of the drain cooling section overlaps with the central axis of the spiral cooling section, and the end of the spiral cooling section located inside the tool holder is connected to the injection port through the injection cooling section.

[0010] Preferably, the coolant is injected into the spiral cooling section through the injection port, flows sequentially through the transition cooling section and the drainage cooling section, and is then discharged outward through the injection cooling section.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention constructs a composite heat dissipation channel by incorporating a spiral cooling section, a drain cooling section, a transition cooling section, and a fill cooling section. The spiral cooling section employs a spiral path design, extending the flow path of the coolant within the cutting head and increasing the heat exchange area between the coolant and the cutting head, thus more effectively absorbing the heat generated during cutting. The drain cooling section overlaps with the central axis of the spiral cooling section and is smoothly connected through the transition cooling section, ensuring efficient coolant flow and allowing the coolant to quickly drain after absorbing heat. This effectively reduces the cutting head temperature, preventing problems such as decreased tool substrate hardness and edge chipping caused by high temperatures, indirectly extending the tool's service life.

[0012] The coolant of this invention flows within the built-in heat dissipation channels (spiral cooling section, draining cooling section, transition cooling section and injection cooling section), and does not directly contact the workpiece, thus avoiding thermal deformation of the workpiece due to temperature difference (especially when machining high-precision parts, such as mold cavities, precision gears, and workpiece materials that are sensitive to temperature).

[0013] In addition, the closed loop of this invention can realize the recycling of coolant (only needing to replenish evaporation loss), reduce waste liquid discharge, and is suitable for scenarios with high environmental protection requirements (such as medical equipment and food machinery processing); the coolant does not come into contact with the chips and workpiece surface, and can be kept clean (such as processing aerospace titanium alloys and high-temperature alloys, where it is necessary to avoid chips and coolant mixing and contaminating the workpiece). Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a partial cross-sectional structural diagram of the present invention.

[0016] In the picture: 1. Handle; 2. Cutting head; 3. Wear-resistant coating; 4. Spiral cooling section; 5. Drainage cooling section; 6. Transition cooling section; 7. Injection cooling section; 8. Injection port; 9. Drainage port. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are merely embodiments of a cooling section of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0018] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 the present invention and for 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 the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0019] As attached Figure 1 To be continued Figure 2 As shown: This utility model provides a high wear-resistant cemented carbide cutting tool, comprising a tool holder 1, a tool head 2, a wear-resistant coating 3, a spiral cooling section 4, a drain cooling section 5, a transition cooling section 6, a liquid injection cooling section 7, a liquid injection port 8, and a liquid discharge port 9. The tool holder 1 and the tool head 2 are integrally formed, and the spiral cooling section 4 and the drain cooling section 5 are disposed inside both. The surface of the tool head 2 is provided with a wear-resistant coating 3, and the transition cooling section 6 is disposed inside. The liquid injection cooling section 7 and the liquid injection port 8 of the tool holder 1 are interconnected, and the liquid discharge port 9 of the tool holder 1 is connected to the drain cooling section 5.

[0020] Furthermore, the tool holder 1 and the tool head 2 are manufactured using a one-piece forging process. Both are made of WC-Co series ultrafine grain cemented carbide as the base material, possessing a hardness of HRA90-92 and a bending strength of ≥2800MPa. Inside the tool, the spiral cooling section 4 located in the area of ​​the tool holder 1 and the drain cooling section 5 located in the area of ​​the tool head 2 are connected by a transition cooling section 6. The transition cooling section 6 adopts a spiral geometry structure to ensure a smooth transition of the coolant.

[0021] Furthermore, the spiral cooling section 4, the drain cooling section 5, the transition cooling section 6, and the injection cooling section 7 adopt a modular interconnection design: the input end of the injection cooling section 7 is connected to the injection port 8 by a threaded seal, and the output end is fixedly connected to the input end of the spiral cooling section 4 by laser welding; the output end of the spiral cooling section 4 forms a smooth transition connection with the input end of the drain cooling section 5 through the transition cooling section 6; the output end of the drain cooling section 5 is directly integrally formed with the drain port 9.

[0022] Furthermore, the spiral cooling section 4 is a right-hand spiral cooling channel with a spiral angle of 30°-35°. The spiral lead is adapted to the cutting edge lead of the cutter head 2 and is closely attached to the interior of the cutting edge base of the cutter head 2. The end of the spiral cooling section 4 located inside the cutter head 2 is smoothly connected to the inner end of the vertically arranged drain cooling section 5 through a 15° inclined transition cooling section 6. The drain cooling section 5 is a cylindrical straight channel that extends along the axis of the cutter head 2. Its outer end is perpendicularly connected to the drain port 9 on the tail end face of the cutter head 2. A 0.5mm thick filter screen is provided at the drain port 9 to prevent backflow of chips.

[0023] Furthermore, the central axis of the drain cooling section 5 is completely aligned with the virtual central axis of the spiral cooling section 4, forming a concentric layout, which reduces the pressure loss of the coolant by more than 15% when the coolant changes direction. The starting end of the spiral cooling section 4, located inside the tool holder 1, is connected to the injection port 8 through a right-angle bent tube structure of the injection cooling section 7. The injection cooling section 7 uses a 90° forged elbow, one end of which is sealed to the starting port of the spiral cooling section 4 by silver brazing, and the other end is connected to the injection port 8 by an M10×1 thread. The connection is wrapped with polytetrafluoroethylene sealing tape to ensure leak prevention.

[0024] Furthermore, the coolant is connected to an external high-pressure pump unit (working pressure 0.8-1.2MPa) through the injection port 8. After being stabilized by the injection cooling section 7, it is injected into the spiral cooling section 4, forming turbulence in the spiral channel and exchanging heat efficiently with the cutting edge of the cutter head 2. Subsequently, the coolant is buffered and depressurized by the transition cooling section 6 and flows into the drain cooling section 5, which is quickly discharged along the axis direction and finally discharged to the external recovery system through the drain port 9.

[0025] The working principle is as follows: First, the external coolant is introduced through the injection port 8 and enters the injection cooling section under the action of the external high-pressure pump group. After being stabilized by this section, it is injected into the spiral cooling section 4.

[0026] Secondly, the coolant forms turbulence in the spiral cooling section 4. Because the spiral path is close to the cutting edge base of the tool head 2 and the spiral lead is matched with the cutting edge lead, it can fully exchange heat with the cutting edge of the tool head 2 and absorb a large amount of heat generated by cutting.

[0027] Then, the coolant that has completed heat exchange flows through the transition cooling section 6. The spiral geometry and inclined design of this section allow the coolant to transition smoothly and buffer the pressure reduction before flowing into the drain cooling section 5.

[0028] Finally, the coolant is rapidly discharged along the cylindrical straight channel of the drain cooling section 5 (extending along the axis of the cutter head 2), and discharged to the external recovery system through the drain port 9. The filter screen of the drain port 9 prevents backflow of chips and ensures unobstructed flow. Throughout the process, the high-hardness alloy substrate of the tool holder 1 and the cutter head 2, along with the wear-resistant coating on the surface of the cutter head 2, reduce the impact of thermal damage on the tool and ensure the high wear resistance of the tool, with the effective temperature control of the coolant.

[0029] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A high wear-resistant cemented carbide cutting tool, characterized in that, The tool includes a handle (1), a cutting head (2), a wear-resistant coating (3), a spiral cooling section (4), a drain cooling section (5), a transition cooling section (6), a liquid injection cooling section (7), a liquid injection port (8), and a drain port (9). The handle (1) and the cutting head (2) are integrally formed. The spiral cooling section (4) and the drain cooling section (5) are provided inside both of them. The surface of the cutting head (2) is provided with a wear-resistant coating (3), and the transition cooling section (6) is provided inside it. The liquid injection cooling section (7) and the liquid injection port (8) provided on the handle (1) are interconnected. The drain port (9) provided on the handle (1) is connected to the drain cooling section (5).

2. The high wear-resistant cemented carbide cutting tool as described in claim 1, characterized in that: The tool holder (1) and the tool head (2) are both tool structures made of high hardness alloy, and the spiral cooling part (4) and the drain cooling part (5) inside them are connected through the transition cooling part (6).

3. The high wear-resistant cemented carbide cutting tool as described in claim 2, characterized in that: The spiral cooling section (4), the drain cooling section (5), the transition cooling section (6) and the injection cooling section (7) are connected in sequence and together form a composite heat dissipation channel.

4. The high wear-resistant cemented carbide cutting tool as described in claim 3, characterized in that: The spiral cooling section (4) is a spiral path cooling channel. One end of the cutter head (2) located inside it is connected to the inner end of the vertical drain cooling section (5) through the transition cooling section (6). The outer end of the drain cooling section (5) is connected to the drain port (9) provided on the cutter head (2).

5. A high wear-resistant cemented carbide cutting tool as described in claim 4, characterized in that: The axis of the drain cooling section (5) overlaps with the central axis of the spiral cooling section (4). The end of the spiral cooling section (4) located in the handle (1) is connected to the injection port (8) through the injection cooling section (7).

6. The high wear-resistant cemented carbide cutting tool as described in claim 5, characterized in that: The coolant is injected into the spiral cooling section (4) through the injection port (8), and flows through the transition cooling section (6) and the drainage cooling section (5) in sequence, and is then discharged outward through the injection cooling section (7).

Images