A method for manufacturing a micro-groove tool head and micro-texture thereof

Abstract

This invention discloses a microgrooved cutting head and a method for manufacturing its microtexture. The cutting head has a rake face, on which at least one set of microtextures is provided. The microtextures include a first groove formed on the rake face and a plurality of second grooves provided on the bottom surface of the first groove. The method for manufacturing the microtextures of the cutting head includes: machining the first groove on the rake face of the cutting head using an electrical discharge machining (EDM) method with a first electrode; and machining a plurality of second grooves on the bottom surface of the first groove using an EDM method with a second electrode. The beneficial effects of this invention are: the microtextures on the rake face are set in a double-concave form, which is beneficial for the dissipation and buffering of machining stress, has better heat dissipation and chip-holding performance, and has a stable structure, which can significantly improve machining performance; using EDM to machine the microtextures can improve forming efficiency and machining accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of precision machining, and in particular to a micro-groove tool head and a method for manufacturing a micro-texture thereof. Background Art

[0002] Through a large number of experimental studies, it was found that the cutting temperature of the front cutting edge of the cutter head is higher than that of the back cutting edge. The wear performance of the front cutting edge can be reduced by processing micro-texture on the front cutting edge, and the setting form of the micro-texture will directly affect the cutting performance and stability of the cutter head.

[0003] In addition, the cutter head is generally made of superhard materials that are difficult to process. At present, there are three main methods for processing micro textures on the cutter head: 1. Mechanical grinding with a diamond wheel. The wear of the grinding wheel is very fast, and it is difficult to ensure the shape and size requirements of the micro texture, and the precision is low; 2. Laser processing. This processing method is non-contact processing, with high efficiency and small processing deformation, but the laser equipment is expensive and is still in the research and development stage, with poor processability; 3. Ultrasonic processing, with low processing efficiency and serious dust pollution during the processing. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for manufacturing a micro-groove tool head and its micro-texture, which can be beneficial to the dissipation and buffering of stress, has better heat dissipation and chip holding performance, has a stable structure, has high efficiency in processing micro-textures, and can improve molding accuracy and surface quality.

[0005] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides a micro-groove tool head having a front cutting surface, on which is provided at least one group of micro-textures, the micro-texture comprising a first groove opened on the front cutting surface and a plurality of second grooves arranged on the bottom surface of the first groove.

[0006] As a preferred solution, the front cutting surface and the first groove are both triangular in shape, and the side edges of the first groove are correspondingly parallel to the side edges of the front cutting surface.

[0007] As a preferred solution, a plurality of the second grooves located within the first groove are arranged in a triangular array, and the sides of the triangles defined by the plurality of the second grooves are respectively parallel to the sides of the first groove.

[0008] As a preferred solution, three groups of micro-textures are arranged on the front cutting edge, and the three groups of micro-textures are in a triangular array.

[0009] As a preferred solution, the width of the first groove is 0.5-4 mm, the depth of the first groove is 50-200 μm, the width of the second groove is 10-200 μm, and the depth of the second groove is 5-50 μm.

[0010] As a preferred solution, the second groove is in a triangular pyramid shape, and the inner diameter of the second groove gradually increases from the bottom to the top.

[0011] As a preferred solution, a chip removal opening is also provided on the front cutting edge.

[0012] As a preferred solution, the chip removal opening is arranged at the center of the rake face.

[0013] As a preferred solution, the material of the micro-groove cutter head is polycrystalline diamond.

[0014] For the same purpose, the second aspect of the present invention also provides a method for manufacturing a micro-texture of a micro-groove tool head, which comprises the following steps:

[0015] Using a first electrode to process a first groove on a front cutting surface of a tool head by means of electric sparks;

[0016] A plurality of second grooves are machined on the bottom surface of the first groove by using a second electrode in an electric spark manner.

[0017] As a preferred solution, the first groove is processed specifically by the following steps:

[0018] A. The cutter head is mounted on a workbench, the first electrode is mounted on a machine tool spindle, and the cutter head and the first electrode are immersed in spark oil; wherein the shape of the discharge end surface of the first electrode matches the shape of the first groove to be formed;

[0019] B. Connect the cutter head and the first electrode to the two poles of the pulse power supply respectively;

[0020] C. The machine tool spindle drives the first electrode to feed in a direction perpendicular to the front cutting surface of the tool head, and performs electric spark machining on the front cutting surface of the tool head to form a first groove.

[0021] As a preferred solution, when forming the first groove, the pulse voltage of the pulse power supply is 10-200V, the pulse width is 0.1-100 μs and the pulse interval width is 0.1-100 μs.

[0022] As a preferred solution, the feeding speed of the first electrode is 0.1-5 μm / s.

[0023] As a preferred solution, the second groove is processed specifically by the following steps:

[0024] S1, the cutter head is mounted on the workbench, the second electrode is mounted on the spindle of the machine tool, and the cutter head and the second electrode are immersed in spark oil; wherein the shape of the discharge end face of the second electrode matches the shape of the first groove, and a plurality of convex portions matching the shape of the second groove to be formed are arranged on the discharge end face of the second electrode;

[0025] S2, connecting the cutter head and the second electrode to the two poles of the pulse power supply respectively;

[0026] S3. The machine tool spindle drives the second electrode to feed in a direction perpendicular to the front cutting surface of the tool head, and performs electric spark machining on the bottom surface of the first groove to form a plurality of second grooves.

[0027] As a preferred solution, when forming the micro texture, the pulse voltage of the pulse power supply is 10-200V, the pulse width is 0.1-100 μs, and the pulse width is 0.1-100 μs.

[0028] As a preferred solution, the feeding speed of the second electrode is 0.1-5 μm / s.

[0029] As a preferred solution, both the first electrode and the second electrode are copper electrodes.

[0030] Compared with the prior art, the present invention provides a method for manufacturing a tool head and a micro-texture thereof, which has the following beneficial effects:

[0031] The micro-groove tool head of the embodiment of the present invention is provided with at least one group of micro-textures on the rake face, and the micro-textures are in the form of double concave, and the micro-textures include a first groove opened on the rake face and a plurality of second grooves arranged on the bottom surface of the first groove, which can not only effectively dissipate and buffer the processing stress of the tool head during the processing, but also, compared with other forms of micro-textures, the structure of the tool head is more stable and reliable, and the processing performance of the tool head can be greatly improved;

[0032] In addition, the micro-texture on the front cutting edge is formed by electrospark in the embodiment of the present invention, which has high processing efficiency, high forming accuracy and good surface quality compared with traditional mechanical processing, ultrasonic processing and laser processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a micro-groove cutter head in an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of a method for forming a first groove of a micro-texture in an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a method for forming a second groove of a micro-texture in an embodiment of the present invention;

[0036] Figure 4 is a schematic structural diagram of a second electrode in an embodiment of the present invention;

[0037] Figure 5 It is a schematic flow chart of a method for manufacturing a micro-texture of a micro-groove tool head in an embodiment of the present invention;

[0038] Figure 6 is a schematic flow chart of a method for forming a first groove of a micro-texture in an embodiment of the present invention;

[0039] Figure 7 It is a schematic flow chart of a method for forming a second groove of a micro-texture in an embodiment of the present invention.

[0040] In the figure, 1, tool head; 11, front tool face; 111, first groove; 112, second groove; 113, chip removal opening; 2, first electrode; 3, second electrode; 31, convex portion. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0043] like Figure 1 As shown, a micro-groove tool head according to a preferred embodiment of an embodiment of the present invention has a front cutting surface 11, on which at least one group of micro-textures is provided, and the micro-texture includes a first groove 111 opened on the front cutting surface 11 and a plurality of second grooves 112 provided on the bottom surface of the first groove 111.

[0044] Based on the above technical solution, since a double-layer concave micro-texture is set on the front cutting edge 11, it can effectively dissipate and buffer the processing stress of the cutter head during the processing, improve the heat dissipation and chip holding performance, thereby greatly improving the processing performance of the cutter head, and compared with a single-layer concave micro-texture, it can ensure the structural stability of the cutter head.

[0045] In order to further ensure the stability of the micro-groove cutter head, the overall profile of the cutter head 1 is in the shape of a triangular prism, and the front cutting surface 11 is in the shape of a triangle.

[0046] Correspondingly, in order to further ensure the release and buffering of the tool head processing stress and improve the heat dissipation and chip holding performance of the tool head, the first groove 111 is triangular in shape, and the side edges of the first groove 111 correspond to each other and are parallel to the side edges of the front cutting surface 11; the plurality of second grooves 112 located in the first groove 111 are in a triangular array, and the side edges of the triangles defined by the plurality of second grooves 112 correspond to each other and are parallel to the side edges of the first groove 111.

[0047] For the same purpose, in this embodiment, three groups of micro-textures are provided on the front cutting edge 11. The three groups of micro-textures are arranged in a triangular array, and the sides of the triangles defined by the three groups of micro-textures are parallel to the sides of the front cutting edge 11, which can further ensure the structural stability of the cutting head.

[0048] In this embodiment, the second groove 112 is in the shape of a triangular pyramid, and the inner diameter of the second groove 112 gradually increases from the bottom to the top. In addition, the second groove 112 can also be set to a shape of a quadrangular pyramid or a multi-pyramid.

[0049] Preferably, in this embodiment, in order to further optimize the heat dissipation and chip holding performance, the width of the first groove is 0.5-4 mm, the depth of the first groove is 50-200 μm, the width of the second groove is 10-200 μm, and the depth of the second groove is 5-50 μm. Exemplarily, the first groove is a triangle with a side length of 0.5-4 mm, and the second groove is a triangular pyramid with a side length of 10-200 μm.

[0050] In this embodiment, in order to further ensure chip removal performance, a chip removal opening 113 is further provided on the rake face 11; illustratively, the chip removal opening 113 is located at the center of the rake face and at a position surrounded by each group of micro-textures.

[0051] The material of the cutter head 1 is any one of polycrystalline diamond, single crystal diamond, chemical vapor deposition diamond, polycrystalline cubic boron nitride, ceramic and cemented carbide, which can meet the high hardness requirement.

[0052] In this embodiment, the cutter head 1 is preferably made of polycrystalline diamond (PCD). The cutter head can be set not only as an integral PCD cutter head, that is, the entire cutter head 1 is formed of PCD in one piece, but also suitable for only setting the surface layer of the cutter head 1 as PCD material. PCD has both the high hardness, high wear resistance and thermal conductivity of diamond, and the high strength and impact resistance of cemented carbide. PCD cutter heads are mainly used for precision machining of alloys, ceramics and hard and brittle wear-resistant materials that do not contain ferrous metals. They have the characteristics of long service life, high production efficiency, high surface finish, and high machining accuracy.

[0053] The second aspect of the embodiment of the present invention provides a method for manufacturing a micro-texture of a micro-groove tool head as described in any one of the first aspects, and the method is specifically referred to in the attached drawings. Figure 5 As shown, it includes the following steps:

[0054] The first electrode 2 is used to process the first groove 111 on the rake face 11 of the tool head 1 by means of electric sparks; the second electrode 3 is used to process a plurality of second grooves 112 on the bottom surface of the first groove 111 by means of electric sparks.

[0055] The first groove 111 and the second groove 112 are formed in sequence by the first electrode 2 and the second electrode 3 respectively by means of electric sparks. During the electric spark machining process, the highly concentrated pulse discharge energy and the powerful discharge explosion force melt the metal in the tool head 1, which has good processability and high efficiency, and can improve the machining accuracy and surface quality.

[0056] Taking the second electrode as an example, the specific working process of electrospark forming is explained: when the first electrode 2 is close to the front cutting edge 11 of the cutter head 1, the pulse voltage is added between the cutter head 1 and the first electrode 2, and the spark oil at the nearest point between the cutter head 1 and the first electrode 2 under the conditions at that time is broken down to form a discharge path. The pulse voltage produces a gap discharge phenomenon, which will generate high temperature and ablate the front cutting edge 11 of the cutter head 1, thereby achieving the purpose of removing material; the first pulse discharge ends, and within a very short time, the next pulse discharge process occurs at the nearest point between the next cutter head 1 and the first electrode 2, and the whole process is repeated, and the first electrode 2 is continuously fed, so that the contour shape of the front end of the first electrode 2 is copied to the front cutting edge of the cutter head to form a first groove.

[0057] The processing of the second electrode 3 is similar to that of the first electrode 2 , and the convex portion 31 on the discharge end surface of the second electrode 3 is copied to the bottom surface of the first groove 111 of the tool head 1 , thereby forming the second groove 112 .

[0058] Specifically, Figure 2 and Figure 6 As shown, the first groove 111 is processed specifically by the following steps:

[0059] A. The cutter head 1 is mounted on a workbench, the first electrode 2 is mounted on a machine tool spindle, and the cutter head 1 and the first electrode 2 are immersed in spark oil; wherein the shape of the discharge end surface of the first electrode 2 matches the shape of the first groove 111 to be formed;

[0060] B. The machine tool spindle drives the first electrode 2 to feed in a direction perpendicular to the rake face 11 of the cutter head 1, and performs electrical spark machining on the rake face 11 of the cutter head 1 to form a first groove.

[0061] Preferably, in order to achieve high processing accuracy and maximize efficiency, the first electrode 2 adopts unidirectional feeding, and the feeding speed V is 0.1-5 μm / s; when forming the microtexture, the pulse voltage of the pulse power supply is 10-200V, the pulse width is 0.1-100 μs, and the pulse width is 0.1-100 μs.

[0062] See attached Figure 3 and Figure 7 As shown, specifically, the second groove 112 is processed by the following steps:

[0063] S1, the cutter head 1 is installed on the workbench, the second electrode 3 is installed on the spindle of the machine tool, and the cutter head 1 and the second electrode 3 are immersed in spark oil; wherein the shape of the discharge end surface of the second electrode 3 matches the shape of the first groove 111, and the discharge end surface of the second electrode 3 is provided with a plurality of convex portions 31 matching the shape of the second groove 112 to be formed, such as Figure 4 As shown;

[0064] S2, connecting the cutter head 1 and the second electrode 3 to the two poles of the pulse power supply respectively;

[0065] S3 , the machine tool spindle drives the second electrode 3 to feed in a direction perpendicular to the rake face 11 of the tool head 1 , and performs electrospark machining on the bottom surface of the first groove 111 to form a plurality of second grooves 112 .

[0066] Similarly, in order to ensure processing accuracy and efficiency, when forming the second groove 112, the pulse voltage of the pulse power supply is 10~200V, the pulse width is 0.1~100μs and the pulse width is 0.1~100μs; the second electrode 3 adopts unidirectional feeding, and the feeding speed Vf is 0.1~5μm / s.

[0067] In this embodiment, the first electrode 2 and the second electrode 3 are both configured as copper electrodes; alternatively, the first electrode 2 and the second electrode 3 may also be configured as copper electrodes or mixed electrodes containing copper.

[0068] In summary, an embodiment of the present invention provides a method for manufacturing a micro-groove tool head and its micro-texture, wherein at least one group of micro-textures is arranged on the front cutting edge, and the micro-texture is in the form of a double concave shape, and the micro-texture includes a first groove opened on the front cutting edge and a plurality of second grooves arranged on the bottom surface of the first groove, which can not only effectively dissipate and buffer the processing stress of the tool head during the processing, but also, compared with other forms of micro-textures, make the structure of the tool head more stable and reliable, and can greatly improve the processing performance of the tool head; in addition, the micro-texture on the front cutting edge is formed by electrospark in the embodiment of the present invention, which has high processing efficiency, high forming accuracy and good surface quality compared with traditional mechanical processing, ultrasonic processing and laser processing.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A micro-groove cutter head, characterized in that: The tool head has a rake face, and the rake face is provided with at least one group of micro textures, and the micro textures include a first groove opened on the rake face and a plurality of second grooves provided on the bottom surface of the first groove; The rake face and the first groove are both triangular in shape, and the side edges of the first groove are respectively parallel to the side edges of the rake face; A plurality of the second grooves located in the first groove are arranged in a triangular array, and the sides of the triangles defined by the plurality of the second grooves are respectively parallel to the sides of the first groove; Three groups of micro textures are arranged on the rake face, and the three groups of micro textures are in a triangular array; The second groove is in a triangular pyramid shape, and the inner diameter of the second groove gradually increases from the bottom to the top.

2. The micro groove cutter head according to claim 1, characterized in that: The width of the first groove is 0.5-4 mm, the depth of the first groove is 50-200 μm, the width of the second groove is 10-200 μm, and the depth of the second groove is 5-50 μm.

3. The micro groove cutter head according to claim 1 or 2, characterized in that: The front cutting edge is also provided with a chip removal opening.

4. The micro groove cutter head according to claim 3, characterized in that: The chip removal opening is arranged at the center of the rake face.

5. The micro groove cutter head according to claim 1, characterized in that: The material of the cutter head is polycrystalline diamond.

6. A method for manufacturing the micro-texture of the micro-groove tool head according to any one of claims 1 to 5, characterized in that: The following steps are involved: Using a first electrode to process a first groove on a front cutting surface of a tool head by means of electric sparks; A plurality of second grooves are machined on the bottom surface of the first groove by using a second electrode in an electric spark manner.

7. The method for manufacturing the micro-texture of the micro-groove tool head according to claim 6, characterized in that: The first groove is processed by the following steps: A. The cutter head is mounted on a workbench, the first electrode is mounted on a machine tool spindle, and the cutter head and the first electrode are immersed in spark oil; wherein the shape of the discharge end surface of the first electrode matches the shape of the first groove to be formed; B. Connect the cutter head and the first electrode to the two poles of the pulse power supply respectively; C. The machine tool spindle drives the first electrode to feed in a direction perpendicular to the front cutting surface of the tool head, and performs electric spark machining on the front cutting surface of the tool head to form a first groove.

8. The method for manufacturing a micro-groove tool head according to claim 7, characterized in that: When forming the first groove, the pulse voltage of the pulse power supply is 10-200V, the pulse width is 0.1-100μs and the pulse interval width is 0.1-100μs.

9. The method for manufacturing a micro-groove tool head according to claim 7, characterized in that: The feeding speed of the first electrode is 0.1 to 5 μm / s.

10. The method for manufacturing the micro-texture of the micro-groove tool head according to claim 6, characterized in that: The second groove is processed specifically by the following steps: S1, the cutter head is mounted on the workbench, the second electrode is mounted on the spindle of the machine tool, and the cutter head and the second electrode are immersed in spark oil; wherein the shape of the discharge end face of the second electrode matches the shape of the first groove, and a plurality of convex portions matching the shape of the second groove to be formed are arranged on the discharge end face of the second electrode; S2, connecting the cutter head and the second electrode to the two poles of the pulse power supply respectively; S3. The machine tool spindle drives the second electrode to feed in a direction perpendicular to the front cutting surface of the tool head, and performs electric spark machining on the bottom surface of the first groove to form a plurality of second grooves.

11. The method for manufacturing the micro-texture of the micro-groove tool head according to claim 10, characterized in that: When forming the micro texture, the pulse voltage of the pulse power supply is 10-200V, the pulse width is 0.1-100μs, and the pulse width is 0.1-100μs.

12. The method for manufacturing a micro-texture of a tool head according to claim 10, characterized in that: The feeding speed of the second electrode is 0.1-5 μm / s.

13. The method for manufacturing a micro-texture of a micro-groove tool head according to any one of claims 6 to 12, characterized in that: The first electrode and the second electrode are both copper electrodes.

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