Micro-fine heat pipe assisted milling cutter insert

Abstract

This invention discloses a micro heat pipe-assisted milling insert, belonging to the field of metal cutting tool technology, used in high-speed cutting processes. It includes a tool body, with micro-dimples machined on the rake face near the cutting area. Micro-grooves are machined on the rake face, flank face, and secondary flank face near the cutting area. The main function of the micro-grooves is to introduce nanofluid cutting fluid into the core cutting area, thereby reducing the temperature of the cutting area, improving the actual utilization rate of the cutting fluid, and reducing the amount of cutting fluid used. The micro-grooves on the rake and flank faces also reduce the contact area between the tool and chips, and between the tool and workpiece during cutting, thereby reducing the friction between the tool and chips, and between the tool and workpiece, slowing down the tool wear rate, thus extending the tool's service life, improving the surface finish of the machined workpiece, and achieving green machining. This results in high-quality and high-efficiency machining in high-speed metal cutting processes.

Description

Technical Field

[0001] This invention belongs to the field of metal cutting tool technology, and more specifically, this invention relates to a micro heat pipe-assisted milling insert. Background Technology

[0002] Machining technology plays a vital role in the machinery manufacturing industry and remains irreplaceable. The intense deformation of materials during machining generates significant heat, and the friction between the tool and chips, and between the tool and workpiece, also generates heat on the tool. If this heat is not dissipated or eliminated promptly, the excess heat will not only reduce tool life but also cause thermal damage to the machined material, severely impacting production efficiency.

[0003] In the field of metal cutting tool technology, existing cooling methods mainly involve using a large amount of cutting fluid during the cutting process to rapidly dissipate heat near the tool tip and ensure tool life. However, during high-speed cutting, the cutting fluid often cannot fully reach the vicinity of the cutting edge, resulting in ineffective heat dissipation and insufficient cooling of the area near the tool tip, leading to relatively rapid tool wear.

[0004] Existing patent CN 202110668060.0 discloses a superhard cutting tool with a composite microtexture, including a tool body and a microtextured cutting head connected to the tool body; the microtextured cutting head includes a rake face, a flank face, and a cutting tip, with a cutting edge formed at the junction of the rake face and the flank face; the rake face has a first hydrophilic microtexture, and the flank face has a second hydrophilic microtexture; the first hydrophilic microtexture includes a first microgroove group, with a first trapezoidal microgroove and a first pit group on the side of the first microgroove group facing the cutting edge, the first trapezoidal microgroove communicating with the first microgroove group; the first microgroove group includes a second trapezoidal microgroove and a triangular The second trapezoidal microgroove has a wide side at the end near the tool tip and a narrow side at the end away from the tool tip. A triangular microgroove is located between the wide side of the second trapezoidal microgroove and the tool tip, and the second trapezoidal microgroove is connected to the triangular microgroove. However, this patent only addresses part of the cutting fluid cooling problem. How to further increase the thermal conductivity of the cutting tool during machining, utilize the cooling effect of the cutting fluid to more effectively reduce the temperature of the cutting area, improve tool life, and achieve green machining are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] To address the current challenges of further reducing cutting temperature and tool wear with microtextured cutting tools, this invention proposes a micro-heat pipe-assisted milling insert. Its purpose is to effectively reduce the temperature of the cutting area at the tool tip during the cutting process, thereby reducing the cutting force and improving the surface quality of the workpiece and the tool's service life, while also reducing the use of cutting fluid.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0007] A micro heat pipe-assisted milling insert includes: a tool base; micro grooves are machined on the rake face, flank face, and secondary flank face of the tool base near the cutting area; micro pits are also machined on the rake face, and the micro pits cooperate with the micro heat pipes. During the cutting process, the cutting heat generated is transferred upward from the bottom end of the micro heat pipes, and the nanofluid cutting fluid with better thermal conductivity flows downward from the top end of the micro heat pipes into the micro pits on the rake face.

[0008] As a further technical solution, the microgrooves provided on the rake face of the tool body are dispersed from the micro-pits on the rake face, extending from the main cutting edge and the secondary cutting edge to the flank face and the secondary flank face respectively, and intersecting with the microgrooves on the flank face and the secondary flank face.

[0009] As a further technical solution, multiple microgrooves are provided on the flank face of the tool body. The microgrooves are parallel to the main cutting edge, and the width, depth and spacing of the microgrooves are equal, with a length of 1.5 to 2 mm.

[0010] As a further technical solution, multiple microgrooves are provided on the secondary flank face of the tool base. The microgrooves are parallel to the secondary cutting edge, and the width, depth and spacing of the microgrooves are equal, with a length of 1.5 to 2 mm.

[0011] As a further technical solution, the microgrooves on the flank face and the secondary flank face are connected at the intersection of the flank face and the secondary flank face.

[0012] As a further technical solution, the microgrooves on the front cutting surface of the blade are distributed radially outward from the micro-pits.

[0013] Compared with the prior art, the micro heat pipe-assisted milling cutter of the present invention has the following advantages:

[0014] 1. The micro-recesses on the front face of the cutting tool in this invention can be used in conjunction with micro heat pipes. The main functions are: firstly, the addition of micro heat pipes increases the thermal conductivity of the cutting area of ​​the cutting tool, thereby accelerating the heat dissipation of the cutting area; secondly, micro heat pipes can help the nanofluid cutting fluid enter the micro-recesses more smoothly, reducing the temperature of the cutting area, thereby extending the tool life and improving the utilization rate of the cutting fluid.

[0015] 2. Furthermore, after the present invention provides surface microgrooves on the rake face, flank face, and secondary flank face of the tool body, the microgrooves have the following main functions during the cutting process: firstly, to help the nanofluid cutting fluid reach the core cutting area through the microgrooves, thereby reducing the temperature of the cutting area and improving the utilization rate of the cutting fluid; secondly, to reduce the friction between the tool and the chips, and between the tool and the workpiece, thereby extending the tool life, improving the surface quality of the machined workpiece, and increasing production efficiency. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 Schematic diagram of a milling cutter for a micro heat pipe in conjunction with a micro heat pipe;

[0018] Figure 2 A schematic diagram showing the use of a micro heat pipe auxiliary milling cutter in conjunction with a cutter head;

[0019] Figure 3 Schematic diagram of a micro heat pipe auxiliary milling cutter;

[0020] Figure 4 This is a magnified schematic diagram of the tip region of a micro heat pipe-assisted milling cutter.

[0021] Among them, 1. Tool body; 2. Rake face; 3. Back face; 4. Secondary back face; 5. Microgroove; 6. Micro-pit; 7. Main cutting edge; 8. Secondary cutting edge; 9. Micro heat pipe; 10. Liquid reservoir ring; 11. Tool disc; 12. Workpiece. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] The purpose of this embodiment is to provide a cutting tool structure suitable for metal cutting, which reduces the temperature of the cutting area of ​​the tool during metal cutting, reduces tool wear, extends tool life, reduces the use of cutting fluid, and ensures the surface quality of the machined workpiece.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in the figure, the micro heat pipe-assisted milling insert disclosed in this embodiment of the invention includes a cutter body 1, which includes a rake face 2, a flank face 3, and a secondary flank face 4. Microgrooves 5 are machined on the rake face 2, flank face 3, and secondary flank face 4 near the cutting area, but the arrangement of the microgrooves 5 on different cutter faces is not exactly the same. The main function of the microgrooves 5 is to introduce nanofluid cutting fluid into the core cutting area, thereby reducing the temperature of the cutting area of ​​the insert, improving the actual utilization rate of the cutting fluid, and reducing the amount of cutting fluid used. The microgrooves 5 on the rake face and flank face also reduce the contact area between the tool and the chips and between the tool and the workpiece during the cutting process, thereby reducing the friction between the tool and the chips and between the tool and the workpiece, slowing down the wear rate of the tool, so as to extend the service life of the tool, improve the surface finish of the machined workpiece, and achieve the purpose of green machining, thereby achieving high-quality and high-efficiency machining in the high-speed metal cutting process.

[0026] Furthermore, the rake face 2 of the tool body is machined with micro-dimples 6 near the cutting area. In this embodiment of the invention, the micro-dimples 6 on the rake face 2 of the tool body can cooperate with micro heat pipes 9. The micro heat pipes 9 are inserted into the aforementioned micro-dimples 6. The insertion of the micro heat pipes 9 improves the heat dissipation capacity of the tool near the cutting area on the one hand, and introduces nanofluid cutting fluid into the micro-dimples 6 on the other hand. That is, the cutting heat generated during the cutting process is transferred upward from the bottom end of the micro heat pipe 9, and the nanofluid cutting fluid with better thermal conductivity flows downward from the top end of the micro heat pipe 9 into the micro-dimples 6 on the rake face 2, thereby achieving rapid cooling of the cutting area of ​​the tool.

[0027] In this embodiment, microgrooves 5 are provided on the rake face 2 of the tool base. These microgrooves 5 disperse from the micro-pits 6 on the rake face, extending from the main cutting edge 7 and the secondary cutting edge 8 to the flank face 3 and the secondary flank face 4, respectively, and intersecting with the microgrooves 5 on the flank face 3 and the secondary flank face 4. Figure 3 , Figure 4As shown, the number of microgrooves 5 on each cutting face can be set as needed. In this embodiment, five microgrooves 5 are schematically shown on the rake face 2. The five microgrooves 5 are radially distributed, with two extending to the position of the microgrooves 5 on the secondary flank face 4 and intersecting with all the microgrooves 5 on the secondary flank face 4. The other two extend to the position of the microgrooves 5 on the flank face 3 and intersect with all the microgrooves 5 on the flank face 3. The middle microgroove 5 extends along the intersection of the flank face 3 and the secondary flank face 4. The microgrooves 5 on the rake face 2 mainly function to guide the cutting fluid to the flank face 3 and the secondary flank face 4. They can also reduce the wear of the rake face 2 by reducing the friction between the tool and the chip, thereby increasing the tool's service life and helping to accelerate chip separation.

[0028] Furthermore, in this embodiment, the microgrooves 5 on the flank face 3 of the tool base are parallel to the main cutting edge 7. Multiple microgrooves 5 are provided on this surface, and the width, depth and spacing of the multiple microgrooves 5 are equal, with a length of 1.5 to 2 mm. The parallelism between the microgrooves 5 and the main cutting edge 7 helps the cutting fluid to be closer to the core cutting area under the action of centrifugal force and gravity during the cutting process, reducing the temperature of the cutting area and improving the actual utilization rate of the cutting fluid. In addition, the microgrooves 5 on the flank face 3 can also reduce the wear of the flank face 3 by reducing the friction between the tool and the workpiece, thereby improving the tool's service life and ensuring the machining quality of the workpiece.

[0029] Furthermore, in this embodiment, the microgrooves 5 provided on the secondary flank face 4 of the tool base are parallel to the secondary cutting edge 8. Multiple microgrooves 5 are provided on this face, and the width, depth and spacing of the multiple microgrooves 5 are equal, with a length of 1.5 to 2 mm. The parallelism between the microgrooves 5 and the secondary cutting edge 8 helps the cutting fluid to be closer to the core cutting area under the action of centrifugal force during the cutting process, thereby reducing the temperature of the cutting area and improving the actual utilization rate of the cutting fluid.

[0030] Furthermore, the microgroove 5 on the flank face 3 of the aforementioned tool body intersects with the microgroove 5 on the secondary flank face 4 at the end.

[0031] Furthermore, in this embodiment, the design of the width, depth, and spacing of the microgrooves 5 on the back face 3 and the secondary back face 4 helps to reduce tool wear. At the same time, considering the feasibility of picosecond laser processing, the length can be adjusted according to the physical properties of the material being processed.

[0032] In this embodiment, the micro heat pipe 9 is formed by a bundle of copper tubes. Each copper tube can be selected with an inner and outer diameter of 0.3 mm and 0.5 mm, respectively. The upper part of the micro heat pipe 9 is inserted into the hollow tube extending from the liquid storage ring 10. The nanofluid cutting fluid flows into the micro heat pipe 9 from the hollow tube and flows into the micro pit 6 from the inside of the copper tube or the gap formed by adjacent copper tubes. The micro heat pipe 9 improves the heat dissipation capacity of the tool near the cutting area and introduces the nanofluid cutting fluid into the micro pit 6. The cutting heat generated during the cutting process is transferred upward from the bottom of the micro heat pipe 9, and the nanofluid cutting fluid with better thermal conductivity flows downward from the top of the micro heat pipe 9 into the micro pit 6 on the rake face 2, thereby achieving rapid cooling of the tool cutting area.

[0033] In this embodiment, a magnified schematic diagram of the cutting area of ​​the tool during the cutting process is shown below. Figure 4 As shown, the flow process of the nanofluid cutting fluid in the microgroove 5 is indicated by arrows; the nanofluid cutting fluid flowing out from the micro heat pipe 9 disperses from the micro-pits 6 on the rake face 2, and then flows through the microgroove 5 on the rake face 2 into the microgroove 5 on the main cutting edge 7 and the secondary cutting edge 8.

[0034] In this embodiment, the microgrooves 5 on the front cutting face 2, the rear cutting face 3 and the secondary rear cutting face 4, and the micro-pits 6 on the front cutting face 2 can all be processed by picosecond laser. The positions of the microgrooves 5 and the micro-pits 6 on the front cutting face 2 can be changed according to the processing conditions.

[0035] Furthermore, in this embodiment, the aforementioned micro heat pipe auxiliary milling cutter includes four cutting tips, each of which is provided with the aforementioned groove, recess, and micro heat pipe structure. The groove, recess, and micro heat pipe structure on the four cutting tips may be the same or different.

[0036] The above description is merely a preferred embodiment of the present invention, and while it is quite specific and detailed, it should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A micro heat pipe assisted milling insert, characterized by, The tool body includes a cutting tool, and microgrooves are machined on the rake face, flank face and secondary flank face near the cutting area. Micro-pits are also machined on the rake face. The micro-pits cooperate with micro heat pipes. The cutting heat generated during the cutting process is transferred upward from the bottom end of the micro heat pipes, and the nano-fluid cutting fluid with better thermal conductivity flows downward from the top end of the micro heat pipes into the micro-pits on the rake face. The microgrooves on the rake face of the tool are dispersed from the micro-pits and extend from the main cutting edge and the secondary cutting edge to the flank face and the secondary flank face, respectively, and intersect with the microgrooves on the flank face and the secondary flank face. The micro-grooves on the flank face and the secondary flank face are connected at the intersection of the flank face and the secondary flank face; The microgrooves on the front face of the blade are distributed radially outward from the micro-pits.

2. The micro-fine thermal tube assisted milling insert according to claim 1, wherein: The microgroove on the flank face of the tool is parallel to the main cutting edge.

3. The micro-fine thermal tube assisted milling insert according to claim 2, wherein: Multiple microgrooves are provided on the flank face of the tool, and the width, depth and spacing of the multiple microgrooves are all equal.

4. The micro-fine thermal tube assisted milling insert according to claim 2, wherein: The length of the microgroove on the back face is 1.5~2mm.

5. The micro-fine thermal tube assisted milling insert according to claim 1, wherein: The microgroove on the secondary flank face of the tool is parallel to the secondary cutting edge.

6. The micro-fine thermal tube assisted milling insert according to claim 5, wherein: Multiple microgrooves are provided on the secondary flank face of the tool, and the width, depth and spacing of the multiple microgrooves are all equal.

7. The micro-fine thermal tube assisted milling insert according to claim 5, wherein: The length of the microgroove on the secondary flank blade surface is 1.5~2mm.

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