Solid carbide milling tool

Abstract

A solid carbide milling tool. A peripheral blade rake face (111) is provided with a secondary chip pocket (10); the secondary chip pocket (10) has a pocket face close to a peripheral blade edge (113), and the pocket face is a second rake angle face (11), so that the pocket face of the secondary chip pocket close to the peripheral blade edge (113) forms a peripheral blade second rake angle, the peripheral blade second rake angle being greater than a corresponding peripheral blade first rake angle; and one or more reinforcing portions are provided in the secondary chip pocket, and the reinforcing portions are reinforcing ribs, or protrusions arranged on a pocket face away from the peripheral blade edge, so that the secondary chip pocket (10) has a plurality of pocket sections, wherein the width of the reinforcing portion is 0.1 mm to 5 mm. The tool structure can improve the sharpness of the blade edge of the milling tool, reduce the cutting force, enhance the wear resistance of the blade edge, and effectively cool the tool.

Description

A solid carbide milling cutter Technical Field

[0001] The invention relates to the technical field of milling cutters, in particular to an integral carbide milling cutter comprising a secondary chip groove. Background Art

[0002] A milling cutter is a widely used multi-tooth, multi-blade rotary tool. During milling, the milling cutter rotates around its axis as the main motion, and the workpiece performs the feed motion. Milling cutters are usually used for high-speed cutting, so they are subject to large impact and vibration during processing. Since a milling cutter is a multi-blade tool, the milling speed is high and there is no idle stroke, so it is a highly efficient cutting method that can not only process planes, grooves, and steps, but also threads, splines, gears and other formed surfaces. The milling cutters in the prior art have problems such as poor processing accuracy, low cutting efficiency, and short service life, and cannot meet the needs of the industry. In particular, for difficult-to-process materials such as titanium alloys, nickel-based alloys, stainless steel, and polymer materials, it is difficult to achieve high-efficiency processing due to factors such as cutting force and cutting heat, which limits production efficiency and becomes an industry problem.

[0003] Summary of the Invention

[0004] The present invention provides a solid carbide milling cutter including a secondary chip groove, which includes the following embodiments:

[0005] Embodiment 1. A solid carbide milling cutter comprising a body portion, an optional shank portion for direct or indirect connection with a machine tool, and an optional neck portion connecting the body portion and the shank portion, wherein the body portion is made of solid carbide, the body portion having a plurality of peripheral cutting edges and a plurality of main chip grooves corresponding to the peripheral cutting edges, the peripheral cutting edges each independently having a peripheral blade rake face, a peripheral blade flank face and a peripheral blade edge, wherein the peripheral blade rake face forms a peripheral blade first rake angle at each location of the peripheral blade edge, characterized in that a secondary chip groove is provided on the peripheral blade rake face, the secondary chip groove extends in the length direction along the direction of the peripheral blade edge, and the secondary chip groove has a peripheral blade edge close to the peripheral blade edge. The flute surface of the peripheral cutting edge and the flute surface away from the peripheral cutting edge are provided with a second rake angle surface, so that the flute surface of the secondary chip flute near the peripheral cutting edge forms a second peripheral rake angle, and the second peripheral rake angle is greater than the corresponding first peripheral rake angle. Furthermore, the secondary chip flute is provided with one or more reinforcements, each of which is a rib or a protrusion provided on the flute surface away from the peripheral cutting edge. The protrusion reduces the cross-sectional area of ​​the secondary chip flute at the protrusion by more than 30%, thereby forming a plurality of flute segments. The width of the reinforcement is 0.1 mm to 5 mm, 0.2 mm to 4 mm, or 0.3 mm to 3 mm. Alternatively, the secondary chip flute has a plurality of flute segments, wherein the spacing between two adjacent flute segments is 0.1 mm to 5 mm, 0.2 mm to 4 mm, or 0.3 mm to 3 mm. In some embodiments, the length of each flute segment is 2 to 15 times or 3 to 12 times the spacing. In some embodiments, the second rake angle of the peripheral edge is at least 3°, at least 5°, at least 10°, at least 20°, at least 25°, at least 30° or at least 35° greater than the corresponding first rake angle of the peripheral edge.

[0006] Embodiment 2. The solid carbide milling cutter according to embodiment 1 is characterized in that the second rake angle of the peripheral edge is larger than the first rake angle of the peripheral edge by 3 degrees to 45 degrees, for example, by 5 degrees to 35 degrees.

[0007] Embodiment 3. The integral carbide milling cutter according to embodiment 1 is characterized in that the main chip groove is a spiral groove, the angle of the spiral groove is the angle between the direction of the spiral and the milling cutter spindle, and the angle of the spiral groove is between 3 and 55 degrees, for example, 15 to 50 degrees, for example, 25 to 45 degrees.

[0008] Embodiment 4. The solid carbide milling cutter according to Embodiment 2, wherein the width of the reinforcement portion is 0.5 mm to 2.0 mm, and the length of each groove segment is 2 to 15 times or 3 to 12 times the width. Alternatively, the spacing between two adjacent groove segments is 0.5 mm to 2.0 mm, and the length of each groove segment is 2 to 15 times or 3 to 12 times the spacing.

[0009] Embodiment 5. The solid carbide milling cutter according to embodiment 1 is characterized in that the width of the secondary chip groove is 0.15 mm to 3 mm or 3% to 30% of the diameter of the body part.

[0010] Embodiment 6. The solid carbide milling cutter according to embodiment 1 is characterized in that the depth of the secondary chip groove is 0.1 to 2 mm, or 0.3 to 1.5 mm.

[0011] Embodiment 7. The solid carbide milling cutter according to embodiment 1 is characterized in that the diameter of the body portion is 1 mm to 50 mm, for example, 5 mm to 40 mm, 6 mm to 25 mm.

[0012] Embodiment 8. The solid carbide milling cutter according to embodiment 6 is characterized in that the depth of the secondary chip groove is 0.2 to 0.8 times, for example, 0.3 to 0.6 times, the width of the secondary chip groove.

[0013] Embodiment 9. The solid carbide milling cutter according to embodiment 1 is characterized in that the milling cutter bottom surface has multiple bottom cutting edges, each of the bottom cutting edges independently having a bottom cutting edge rake face, a bottom cutting edge flank face, and a bottom cutting edge, the bottom cutting edges are arranged corresponding to the peripheral cutting edges, the connection between the bottom cutting edges and the peripheral cutting edges is a cutting edge, and a cutting edge chip breaker is provided at the position of the cutting edge, and the cutting edge is optionally arc-shaped or chamfered. In this application, the term "cutting edge" may also be referred to as a transition edge, and the cutting edge chip breaker may also be referred to as a transition edge chip breaker.

[0014] Embodiment 10. The integral carbide milling cutter according to embodiment 1 is characterized in that the distance between the secondary chip groove and the peripheral cutting edge is greater than or equal to 0.005 mm and less than or equal to 0.2 mm, greater than or equal to 0.006 mm and less than or equal to 0.15 mm, greater than or equal to 0.01 mm and less than or equal to 0.18 mm, greater than or equal to 0.02 mm and less than or equal to 0.17 mm, greater than or equal to 0.008 mm and less than or equal to 0.1 mm, greater than or equal to 0.009 mm and less than or equal to 0.09 mm, greater than or equal to 0.01 mm and less than or equal to 0.015 mm.

[0015] Embodiment 11. The solid carbide milling cutter according to embodiment 1 is characterized in that the milling cutter is one of the following: an end mill, a ball end mill, a taper milling cutter, a ball end taper milling cutter, a drum milling cutter, and a bull nose milling cutter.

[0016] Embodiment 12. The integral carbide milling cutter according to embodiment 1 is characterized in that the secondary chip groove also includes a third rake angle surface adjacent to the second rake angle surface, the third rake angle surface forms a third rake angle of the peripheral blade, and the third rake angle of the peripheral blade is greater than the corresponding second rake angle of the peripheral blade.

[0017] The present application significantly improves the sharpness of the circumferential blade edge and effectively reduces cutting resistance by providing a secondary chip groove on the circumferential blade rake face and forming a circumferential blade second rake angle that is larger than the corresponding circumferential blade first rake angle. The present application stipulates that one or more reinforcement parts are provided in the secondary chip groove, and the width of the reinforcement part is 0.1mm to 5mm, or 0.3mm to 3mm. The reinforcement part can play a good chip breaking and chip splitting role, thereby effectively controlling the length of the chips, reducing the chip size, improving the chip removal efficiency, and reducing the friction and extrusion force between the chips and the workpiece, thereby significantly improving the surface finish of the product. The design of the reinforcement part enhances the strength of the milling cutter edge, reduces the occurrence of chipping, and effectively improves the processing life of the milling cutter. In addition, the setting of the auxiliary chip groove increases the carrying space of the cutting fluid, the reinforcement part enhances the turbulence of the cutting fluid, improves the cooling efficiency, and achieves sufficient cooling effect on the tool edge and chips. This innovative invention successfully suppresses the heat generated during the cutting process, thereby significantly improving the feed speed and processing efficiency, reducing tool wear, and greatly extending the service life of the tool. This improvement successfully solves the problem of excessive temperature in metal cutting, especially solves the industry problem of difficult processing of high-temperature alloy materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0019] FIG1 is a schematic diagram of the overall structure of a solid carbide milling cutter according to Example 1 of the present application;

[0020] FIG2 is a schematic structural diagram of the body of the solid carbide milling cutter according to Example 1 of the present application;

[0021] FIG3 is a partial schematic diagram of the body portion of the solid carbide milling cutter according to Example 1 of the present application;

[0022] FIG4 is a schematic diagram of a solid carbide milling cutter cutting a workpiece according to Example 1 of the present application;

[0023] FIG5 is a partial enlarged schematic diagram of portion A in FIG4 ;

[0024] FIG6 is a schematic diagram of a milling cutter provided with a secondary chip groove of the present application cutting a workpiece;

[0025] FIG7 is a partial enlarged schematic diagram of portion B in FIG6 ;

[0026] FIG8 is a schematic diagram of a milling cutter without auxiliary chip grooves cutting a workpiece;

[0027] FIG9 is a partial enlarged schematic diagram of portion C in FIG8 ;

[0028] FIG10 is a schematic diagram of a solid carbide milling cutter according to Example 2 of the present application, in which a secondary chip groove is provided with a third rake angle surface to form a third rake angle of a peripheral edge;

[0029] FIG11 is a schematic diagram of the overall structure of a solid carbide milling cutter according to Example 4 of the present application;

[0030] FIG12 is a schematic structural diagram of the body portion of the solid carbide milling cutter according to Example 4 of the present application;

[0031] FIG13 is a schematic structural diagram of the body portion of the solid carbide milling cutter according to Example 4 of the present application;

[0032] FIG14 is a schematic diagram of the overall structure of a solid carbide milling cutter according to Example 5 of the present application;

[0033] FIG15 is a schematic structural diagram of the body of the solid carbide milling cutter according to Example 5 of the present application;

[0034] FIG16 is a schematic structural diagram of the body portion of the solid carbide milling cutter according to Example 5 of the present application;

[0035] FIG17 is a schematic diagram of the overall structure of a solid carbide milling cutter according to Example 6 of the present application;

[0036] FIG18 is a schematic structural diagram of the body of the solid carbide milling cutter according to Example 6 of the present application;

[0037] FIG19 is a partial schematic diagram of a reinforcement portion provided in a secondary chip groove in Example 6 of the present application;

[0038] Figure 20 is a partial enlarged view of the wear of the milling cutter edge.

[0039] Description of the drawings: 100-main body, 110-peripheral cutting edge, 111-peripheral cutting edge rake face, 112-peripheral cutting edge flank face, 113-peripheral cutting edge, 120-main chip groove, 10-secondary chip groove, 11-groove surface close to the peripheral cutting edge (second rake angle surface), 12-third rake angle surface, 13-groove surface away from the peripheral cutting edge, 14-protrusion, 20-peripheral cutting edge reinforcement rib, 130-bottom cutting edge, 131-bottom cutting edge, 132-bottom cutting edge flank face, 133-bottom cutting edge, 140-tool tip, 30-tool tip chip breaker, 200-neck part, 300-shank part, 400-feed per tooth. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0041] The present application discloses a solid carbide milling cutter, which comprises a body part, an optional shank part for direct or indirect connection with a machine tool, and an optional neck part connecting the body part and the shank part, wherein the body part is made of solid carbide, the body part has a plurality of peripheral cutting edges and a plurality of main chip grooves corresponding to the peripheral cutting edges, the peripheral cutting edges each independently have a peripheral blade rake face, a peripheral blade flank face and a peripheral blade edge, wherein the peripheral blade rake face forms a peripheral blade first rake angle at each location of the peripheral blade edge, and is characterized in that a secondary chip groove is provided on the peripheral blade rake face, and the secondary chip groove is extended along the length direction The secondary chip groove extends in the direction of the peripheral blade edge, and the secondary chip groove has a groove surface close to the peripheral blade edge and a groove surface away from the peripheral blade edge, the groove surface close to the peripheral blade edge is a second rake angle surface, so that the groove surface of the secondary chip groove close to the peripheral blade edge forms a peripheral blade second rake angle, the peripheral blade second rake angle is greater than the corresponding peripheral blade first rake angle, and one or more reinforcement parts are provided in the secondary chip groove, the reinforcement part is a reinforcement rib or a protrusion provided on the groove surface away from the peripheral blade edge, the protrusion reduces the cross-sectional area of ​​the secondary chip groove at the protrusion by more than 30%, so that the secondary chip groove has multiple groove segments, wherein the width of the reinforcement part is 0.1mm to 5mm, 0.2mm to 4mm, 0.4mm to 2.5mm, 0.5mm to 2mm or 0.3mm to 3mm, or other combinations of these endpoints. In other words, the secondary chip groove has a plurality of groove segments, wherein the spacing between two adjacent groove segments is 0.1mm to 5mm, or 0.3mm to 3mm. In some embodiments, the length of each groove segment is 2 to 15 times or 3 to 12 times the spacing. During preparation, the reinforcement portion is formed by retaining the original material in the process of forming the secondary chip groove. The shape of the reinforcement portion is not particularly limited, and a shape generally known to those skilled in the art can be adopted, as long as it can play a role in chip breaking and chip separation. Its shape can be a protrusion formed in the secondary chip groove, or a partition across the entire secondary chip groove, that is, a reinforcement rib, also known as a peripheral edge reinforcement rib.

[0042] The present application defines that "the reinforcing portion is a reinforcing rib or a protrusion arranged on the groove surface away from the peripheral cutting edge, and the protrusion reduces the cross-sectional area of ​​the secondary chip groove by more than 30%". The protrusion is located on the groove surface away from the peripheral cutting edge. After the chips enter the secondary chip groove, they can produce chip breaking or chip splitting effects under the action of the protrusion, thereby effectively controlling the length of the chips, reducing the chip size, and improving the chip removal efficiency. In this application, the cross-sectional area of ​​the secondary chip groove refers to the cross-sectional area of ​​the secondary chip groove perpendicular to the extension direction. After the protrusion is set, the cross-sectional area of ​​the secondary chip groove at the protrusion is reduced relative to the secondary chip groove without the protrusion. The larger the protrusion size, the more the cross-sectional area of ​​the secondary chip groove at the protrusion is reduced. When the protrusion provided on the groove surface away from the peripheral cutting edge reduces the cross-sectional area of ​​the secondary chip groove by more than 30% relative to the secondary chip groove without the protrusion, for example, by more than 40%, for example, by more than 50%, the protrusion can play a good chip breaking or chip separation role, effectively reduce the chip size, and facilitate timely discharge of chips. The protrusion can also enhance the turbulence of the cutting fluid and inhibit the accumulation of heat during the cutting process.

[0043] In the present application, the total length of the secondary chip flute can be at least 60% of the length of the peripheral cutting edge, for example, at least 70% of the length of the peripheral cutting edge, at least 80% of the length of the peripheral cutting edge, or at least 85% of the length of the peripheral cutting edge. In some embodiments, the second rake angle of the peripheral cutting edge is greater than the corresponding first rake angle of the peripheral cutting edge by at least 3°, at least 5°, at least 10°, at least 20°, at least 25°, at least 30°, or at least 35°. In some embodiments, the spacing between two adjacent flute segments is 0.4 mm to 2.8 mm, or 0.5 mm to 2.5 mm.

[0044] The terms in this application have the meanings commonly understood by those skilled in the art. For example, the term "circumferential blade rake face" refers to the surface on the peripheral cutting edge over which chips flow, the term "circumferential blade flank face" refers to the surface on the peripheral cutting edge opposite to the surface produced during cutting on the workpiece, and the term "circumferential blade edge" refers to the intersection of the peripheral blade flank face and the peripheral blade rake face, which is the sharp part on the peripheral edge that mainly plays a cutting role.

[0045] The term "circumferential blade first rake angle" in this application has the same meaning as the general term "rake angle" in this field, and the two can be used interchangeably. This application uses "circumferential blade first rake angle" only for the sake of distinction. The term "circumferential blade second rake angle" in this application refers to the angle formed by the second rake angle surface within the "circumferential blade first rake angle" measurement plane. That is, the "circumferential blade first rake angle" is formed by the circumferential blade front cutting surface, and the "circumferential blade second rake angle" is formed by the groove surface of the secondary chip groove close to the circumferential blade edge. For a specific selected point on the circumferential blade edge, the circumferential blade first rake angle and the circumferential blade second rake angle exist at the same time. At this time, the circumferential blade first rake angle is the corresponding circumferential blade first rake angle of the circumferential blade second rake angle of the selected point on the edge.

[0046] In this application, the terms "width of the reinforcement portion," "pitch," and "pitch between two adjacent flute segments" have the same meaning and refer to the distance between two adjacent flute segments separated by the reinforcement portion. When the reinforcement portion is a rib, this distance is the width of the rib. When the reinforcement portion is a protrusion provided on the flute surface away from the peripheral cutting edge, this distance is the width of the area where the protrusion reduces the cross-sectional area of ​​the secondary chip flute by more than 30%. "Length of a flute segment" refers to the dimension of the flute segment extending in the direction of the peripheral cutting edge.

[0047] The term "hard alloy" in this application has the usual meaning understood by those skilled in the art. In this field, hard alloy is a powder metallurgy product made of micron-sized powder of carbide (WC, TiC) of high-hardness refractory metal as the main component, cobalt (Co) or nickel (Ni), molybdenum (Mo) as a binder, and sintered in a vacuum furnace or a hydrogen reduction furnace. Its toughness is much higher than that of high-speed steel, about 800 to 1000 ° C, and the allowed cutting speed is about 4 to 10 times that of high-speed steel. The hardness is very high, reaching (89 to 91) HRA, and some are as high as 93 HRA; but its bending strength is 1.1 to 1.5 GPa, which is only half of that of high-speed steel; the impact toughness is 0.04 MJ / m 2 About, less than 1 / 25 to 1 / 10 of high-speed steel. Due to its good heat resistance and wear resistance, it is increasingly used in cutting tools with less complicated blade shapes. The cemented carbide described in this application includes one selected from the following: for example, tungsten-cobalt (WC-Co) cemented carbide, tungsten-titanium-cobalt (WC-Ti-Co) cemented carbide, tungsten-titanium-tantalum (niobium) (WC-TaC (NbC)-Co) cemented carbide, tungsten-titanium-cobalt-tantalum (niobium) (WC-Ti C-TaC (NbC)-Co) cemented carbide and other WC-based cemented carbides, or TiC-based cemented carbide, ultrafine grain cemented carbide, steel-bonded cemented carbide, coated cemented carbide, etc.

[0048] The present application significantly improves the sharpness of the circumferential blade edge and effectively reduces cutting resistance by arranging a secondary chip groove on the circumferential blade rake face and forming a circumferential blade second rake angle that is larger than the corresponding circumferential blade first rake angle.

[0049] The secondary chip flute described in this application is provided with one or more reinforcements, thereby forming multiple flute segments. The width of the reinforcements is limited to 0.1 mm to 5 mm, or 0.3 mm to 3 mm. The reinforcements can effectively break and separate chips, thereby effectively controlling the length of the chips, reducing the chip size, and improving chip removal efficiency. The friction and extrusion force between the chips and the workpiece are reduced, thereby significantly improving the surface finish of the product. The width of the reinforcement described in this application refers to the dimension of the reinforcement along the length direction of the secondary chip flute.

[0050] The design of the reinforcement part in this application enhances the strength of the milling cutter edge, reduces the occurrence of edge chipping, effectively improves the processing life of the milling cutter, and can set a sharper front angle in the edge area where no reinforcement ribs are set without reducing the overall strength of the edge.

[0051] The technical solution of the present application can effectively suppress the accumulation of heat during the cutting process. The chip breaking and splitting functions of the reinforcement part enable the chips to be discharged smoothly and take away the heat. In addition, the contact area between the peripheral cutting edge area of ​​the auxiliary chip groove provided in the present application and the workpiece surface is much smaller than that of the cutting edge without the auxiliary chip groove, thereby reducing the friction area. The present application suppresses the accumulation of heat during the cutting process and also achieves a better cooling effect due to the provision of the auxiliary chip groove, which increases the carrying space of the cutting fluid. Furthermore, without being limited by theory, the reinforcement part enhances the turbulence of the cutting fluid, increases the contact area and contact time of the cutting fluid, which also plays a role in improving the cooling effect and achieves sufficient cooling of the tool edge and chips. This innovative invention successfully suppresses the accumulation of heat during the cutting process, thereby significantly improving processing efficiency and greatly extending the service life of the tool. This improvement successfully solves the problem of excessive temperature in metal cutting, especially solves the industry problem of difficult processing of high-temperature alloy materials. Practice has shown that milling cutters equipped with the present invention's secondary chip flutes can achieve cutting speeds exceeding 90 m / min when machining titanium alloys, compared to 60-70 m / min with existing technology. They also achieve cutting speeds exceeding 60 m / min when machining nickel-based alloys, compared to 45-50 m / min with existing technology. This reduction in chip heat accumulation effectively suppresses crescent wear on the rake face, increases feed rates, and achieves highly efficient machining.

[0052] The cutting fluid described in this application is also called coolant, which refers to a liquid that lowers the cutting temperature and reduces tool wear during the metal cutting process. Common cutting fluids include oily cutting fluids and water-based cutting fluids.

[0053] The high-temperature alloys described in this application are also known as heat-resistant alloys. Prior art has shown that high-temperature alloys are difficult to cut for the following reasons: 1. High high-temperature strength and a strong tendency to work-harden. During cutting, they experience high resistance to plastic deformation, heavy cutting loads, and high cutting temperatures. The unit cutting force of nickel-based high-temperature alloys is generally 50% higher than that of medium-carbon steel. After machining, the surface layer experiences significant work-hardening and residual stresses, with the degree of hardening reaching 200% to 500%. Cutting edge and edge wear are extremely severe, and groove wear on the secondary flank is also very common. 2. Poor thermal conductivity. The thermal conductivity is approximately 1 / 5 to 1 / 2 that of 45 steel, resulting in high cutting temperatures. Research has shown that when machining heat-resistant alloys, approximately 40% of the heat accumulates in the tool edge area, approximately 40% in the chips, and approximately 20% in the cut material, which can easily cause hardening. 3. A strong tendency to stick to the tool. This can easily lead to built-up edge, which affects the surface quality. 4. High content of strengthening elements. A large number of highly abrasive hard particles, such as metal carbides and intermetallic compounds, form in the alloy, causing severe abrasive damage to the tool. Wear between the tool surface and the workpiece or cutting surface significantly impacts tool life, machining efficiency, and precision. For example, the "cold welding" phenomenon produced when the tool and workpiece are subjected to sufficiently high pressure and high temperature is the result of adsorption between atoms on the fresh surfaces of the friction surfaces. The bonding points between the two friction surfaces will tear apart and be carried away by the other side due to relative motion. If the bonding points rupture on the tool side, tool wear occurs. Cutting temperature is the primary factor influencing adhesive wear. The higher the cutting temperature, the more severe the adhesive wear.

[0054] The technical solution of this application can improve the sharpness of the milling cutter's cutting edge, reduce cutting forces, and enhance the wear resistance of the cutting edge. In particular, the application improves cooling efficiency through the spacing of auxiliary chip grooves and reinforcing ribs or protrusions, effectively cooling the tool and chips. At the same time, it effectively controls chip size and improves chip removal efficiency, successfully suppressing the heat generated during the cutting process. This improves cutting performance, processing efficiency, and product surface quality in multiple aspects, providing a reliable solution for the processing of high-temperature alloy materials.

[0055] In some embodiments, the second rake angle of the peripheral blade is greater than the first rake angle of the peripheral blade by 3 to 45 degrees, for example, 5 to 35 degrees, for example, 6 to 30 degrees, for example, 8 to 25 degrees, for example, 10 to 20 degrees. Those skilled in the art can adjust the second rake angle of the peripheral blade as needed to achieve a sharp edge. Generally, the smaller the first rake angle of the peripheral blade at a certain peripheral blade edge, the greater the change in the second rake angle of the peripheral blade relative to the first rake angle formed by providing the secondary chip groove can be.

[0056] In some embodiments, the main chip groove is a spiral groove, and the angle of the spiral groove is the angle between the direction of the spiral and the milling cutter spindle. The angle of the spiral groove is between 3 and 55 degrees, for example, 15 to 50 degrees, for example, 25 to 45 degrees.

[0057] In some embodiments, the width of the reinforcement portion is 0.5 mm to 2.0 mm, and the length of each groove segment is 2 to 15 times, or 3 to 12 times, the width. Alternatively, the spacing between two adjacent groove segments is 0.5 mm to 2.0 mm, and the length of each groove segment is 2 to 15 times, or 3 to 12 times, the spacing. Suitable spacing and groove segment length settings can further improve chip removal efficiency, increasing the feed per tooth to 1.5 to 3 times that of the prior art, thereby achieving high-efficiency machining.

[0058] In some embodiments, the width of the secondary chip groove is 0.15mm to 3mm or 3% to 30% of the diameter of the body portion. In this application, the "width of the secondary chip groove" refers to the dimension of the secondary chip groove on the circumferential blade rake surface perpendicular to the circumferential blade edge.

[0059] In some embodiments, the depth of the secondary chip groove is 0.1 to 2 mm, or 0.3 to 1.5 mm. In this application, the "depth of the secondary chip groove" refers to the maximum depth from the bottom of the secondary chip groove to the rake face of the peripheral cutting edge. It should be understood by those skilled in the art that there is no particular limit to the depth of the secondary chip groove. If it is too deep, it will be difficult to machine, and if it is too shallow, it will not significantly increase the rake angle.

[0060] In some embodiments, the diameter of the body portion is 1 mm to 50 mm, for example, 5 mm to 40 mm, or 6 mm to 25 mm. As used herein, the term "body portion diameter" refers to the diameter of the maximum outer circle of rotation of the peripheral cutting edge during operation of the milling cutter. Those skilled in the art will appreciate that there is no particular limitation on the diameter of the solid carbide body portion, except that it is generally not too large for cost considerations and not too small for processing difficulty.

[0061] In some embodiments, the depth of the secondary chip groove is 0.2 to 0.8 times, for example, 0.3 to 0.6 times, the width of the secondary chip groove. The depth of the secondary chip groove is not particularly limited and is usually smaller than the width of the secondary chip groove.

[0062] In some embodiments, the bottom surface of the milling cutter has multiple bottom cutting edges, and each of the bottom cutting edges independently has a bottom cutting edge front cutting edge, a bottom cutting edge back cutting edge and a bottom cutting edge. The bottom cutting edge is arranged corresponding to the peripheral cutting edge, and the connection between the bottom cutting edge and the peripheral cutting edge is a cutting tip, and a cutting tip chip breaker groove is arranged at the position of the cutting tip. Optionally, the cutting tip is arc-shaped.

[0063] In some embodiments, the distance between the secondary chip groove and the peripheral cutting edge is greater than or equal to 0.005 mm and less than or equal to 0.2 mm, greater than or equal to 0.006 mm and less than or equal to 0.15 mm, greater than or equal to 0.01 mm and less than or equal to 0.18 mm, greater than or equal to 0.02 mm and less than or equal to 0.17 mm, greater than or equal to 0.008 mm and less than or equal to 0.1 mm, greater than or equal to 0.009 mm and less than or equal to 0.09 mm, or greater than or equal to 0.01 mm and less than or equal to 0.015 mm. The distance between the secondary chip groove and the peripheral cutting edge can improve the toughness of the cutting edge without affecting the performance of the tool.

[0064] Those skilled in the art will appreciate that the technical solution of the present application is applicable to various milling cutters, and those skilled in the art can apply the technical solution of the present application to various milling cutters according to actual conditions. In some embodiments, the milling cutter is one of the following: an end mill, a ball end mill, a taper mill, a ball end taper mill, a drum mill, or a bullnose mill.

[0065] In some embodiments, the secondary chip groove further includes a third rake angle surface adjacent to the second rake angle surface, the third rake angle surface forming a third peripheral edge rake angle, and the third peripheral edge rake angle is greater than the corresponding second peripheral edge rake angle.

[0066] The term "tertiary rake angle" in this application refers to the angle formed by the tertiary rake surface within the measurement plane of the "primary rake angle." For a specific point on the cutting edge, the primary rake angle, the secondary rake angle, and the tertiary rake angle all exist simultaneously. The tertiary rake angle corresponds to the tertiary rake angle at that point on the cutting edge.

[0067] By providing the auxiliary chip groove with the third rake angle of the peripheral blade, the chip flow direction can be effectively guided, the cutting resistance can be reduced, the cutting temperature can be lowered, the friction between the chips and the front cutting edge of the peripheral blade can be effectively suppressed, the chip removal efficiency can be improved, the generation of crescent-shaped wear on the front cutting edge can be effectively suppressed, and the tool life can be further improved.

[0068] The preparation method of the milling cutter in the prior art is known to those skilled in the art and includes the following steps: 1. calculating the shape of the milling cutter according to actual needs and selecting a suitable cemented carbide rod; 2. starting from the cemented carbide rod, the cemented carbide rod is ground to form a blank of the milling cutter; 3. forming a semi-finished product of the milling cutter by fine grinding; 4. PVD coating the semi-finished product to form a finished product of the milling cutter.

[0069] A method for preparing a milling cutter in the present application mainly involves machining a secondary chip groove on the basis of the semi-finished product, and then performing a PVD coating process on the semi-finished product with the secondary chip groove.

[0070] In some embodiments, the secondary chip groove is prepared by a processing method that does not cause thermal damage.

[0071] In some embodiments, the secondary chip groove is prepared by a femtosecond pulse laser processing method. The secondary chip groove described in the present application can be prepared by femtosecond pulse laser processing and forming, for example, a precision CNC laser machine purchased from DMG Mori Seiki Machine Tool Trading Co., Ltd. under the trade name LASERTEC 50Shape can be used. It is generally believed that laser processing and forming will deteriorate the performance of cemented carbide. For example, picosecond and nanosecond processing will cause thermal damage, forming a thermal damage layer in the secondary chip groove area, damaging the tool, and the surface finish is very poor. Not only can it not meet the finishing requirements, but the tool life is sharply reduced. Without being limited by theory, it is believed that the reason for the generation of such a thermal damage layer is that the high temperature generated during the processing causes the cemented carbide to oxidize, the microstructure in the alloy changes, and the hardness and wear resistance are reduced. This can be clearly found by comparing the life of the tool with that without the thermal damage layer. The life of the tool with the thermal damage layer is often less than half of the tool without the thermal damage layer, and some even deteriorate to one-fifth of the normal life or even shorter. Femtosecond pulse laser processing, due to its extremely high speed, does not cause thermal damage, and the surface finish can reach 0.1-0.2nm, or even a mirror finish, making it suitable for fine machining. After the auxiliary chip groove is set, the sharpness of the tool edge is significantly improved, greatly reducing cutting resistance. The reinforcement can effectively break and separate chips, thereby effectively controlling the length of the chips, reducing the chip size, and improving chip removal efficiency. The friction and extrusion force between the chips and the workpiece are reduced, thus significantly improving the surface finish of the product. The design of the reinforcement enhances the strength of the milling cutter edge, reduces the occurrence of chipping, and effectively increases the processing life of the milling cutter. High-precision, high-flexibility, and high-efficiency processing is achieved.

[0072] The above ranges can be used alone or in combination. The present application can be more easily understood through the following examples.

[0073] Example

[0074] Example 1

[0075] As shown in Figures 1 to 3, this embodiment discloses a solid carbide milling cutter, which includes a body part 100, a shank part 300 for connecting to a machine tool, and a neck part 200 connecting the body part and the shank part, wherein the body part 100 is made of solid carbide, the body part 100 has four peripheral cutting edges 110 and four main chip grooves 120 corresponding to the peripheral cutting edges, the main chip grooves are spiral grooves, the angle of the spiral grooves is 25 degrees, the peripheral cutting edges 110 each independently have a peripheral cutting edge rake face 111, a peripheral cutting edge flank face 112 and a peripheral cutting edge 113, wherein the peripheral cutting edge rake face 111 is on the peripheral cutting edge A circumferential blade first rake angle is formed at each location of the cutting edge 113, and is characterized in that a secondary chip groove 10 is provided on the circumferential blade rake face 111, and the secondary chip groove extends in the length direction along the direction of the circumferential blade cutting edge 113, and the secondary chip groove 10 has a groove surface 11 close to the circumferential blade cutting edge, which is a second rake angle surface, so that the groove surface 11 of the secondary chip groove close to the circumferential blade cutting edge forms a circumferential blade second rake angle, and the circumferential blade second rake angle is greater than the corresponding circumferential blade first rake angle, and the secondary chip groove has a plurality of groove segments, wherein the spacing between two adjacent groove segments is about 1 mm, thereby forming a reinforcement portion, namely the circumferential blade reinforcement rib 20, and the length of each groove segment is 8 mm.

[0076] The second rake angle of the peripheral blade is approximately 20 degrees greater than the first rake angle of the peripheral blade. Figures 4 and 5 show schematic diagrams of the second rake angle of the peripheral blade and the first rake angle of the peripheral blade. Figure 4 is a schematic diagram of a milling cutter provided with a secondary chip groove 10 cutting a workpiece, and Figure 5 is a partially enlarged schematic diagram of the chip point circle A in Figure 4. The angle α in Figure 5 is formed by the rake face of the peripheral blade, which is the first rake angle of the peripheral blade, and the angle is approximately 5 degrees. The angle β is formed by the groove surface of the secondary chip groove 10 close to the cutting edge of the peripheral blade (i.e., the second rake angle surface 11), which is the second rake angle of the peripheral blade, and the angle is approximately 25 degrees.

[0077] The diameter of the main body is 25 mm, the width of the secondary chip groove is 2 mm, the depth of the secondary chip groove is 0.6 mm, and the distance between the secondary chip groove and the peripheral cutting edge is about 0.03 mm.

[0078] Figures 6 to 9 exemplarily show the cutting schematic diagrams of the milling cutter provided with the auxiliary chip groove 10 of the present application and the milling cutter without the auxiliary chip groove in the prior art. Among them, Figure 6 is a schematic diagram of the milling cutter provided with the auxiliary chip groove 10 cutting the workpiece, and Figure 7 is a partial enlarged schematic diagram of the chip point circle B in Figure 6. Figure 8 is a schematic diagram of the milling cutter without the auxiliary chip groove cutting the workpiece, and Figure 9 is a partial enlarged schematic diagram of the chip point circle C in Figure 8. 400 in the figure is the feed per tooth of the cutting edge. It can be seen from the figure that by providing the auxiliary chip groove, the sharpness of the peripheral cutting edge is significantly improved, the area of ​​the cutting edge squeezed by the workpiece is reduced, the chip force is reduced, thereby reducing friction, reducing heat generation, making cutting easier, and significantly reducing cutting resistance, so that a higher feed per tooth can be set to improve processing efficiency.

[0079] Furthermore, the circumferential edge reinforcement ribs 20 provided in this application provide excellent chip breaking, effectively controlling chip length and improving chip removal efficiency. The extrusion and friction between the chips and the workpiece are reduced, significantly improving the surface finish of the product. Furthermore, the circumferential edge reinforcement rib design strengthens the milling cutter's cutting edge, reduces chipping, and effectively extends the milling cutter's machining life.

[0080] At the same time, the setting of the auxiliary chip groove 10 increases the carrying space of the cutting fluid, and the peripheral edge reinforcement ribs 20 enhance the turbulence of the cutting fluid, improve the cooling effect, and achieve sufficient cooling effect on the tool edge and chips. This innovative invention successfully suppresses the heat generated during the cutting process, improves the sharpness of the tool and takes into account the toughness, thereby significantly improving the processing efficiency and greatly extending the service life of the tool.

[0081] Example 2

[0082] As shown in Figure 10, this embodiment discloses another integral carbide milling cutter, which is basically the same as Example 1, except that the secondary chip groove 10 also includes a third rake angle surface 12 adjacent to the second rake angle surface 11, and the third rake angle surface 12 forms a third rake angle of the peripheral blade, and the third rake angle of the peripheral blade is greater than the corresponding second rake angle of the peripheral blade.

[0083] Figure 10 shows the first rake angle α, the second rake angle β, and the third rake angle γ of the circumferential blade. In the same measuring plane, the first rake angle α of the circumferential blade is formed by the circumferential blade rake face and is 5 degrees. The second rake angle of the circumferential blade is formed by the groove surface of the secondary chip groove close to the circumferential blade edge (i.e., the second rake angle surface 11) and is 28 degrees. The third rake angle γ of the circumferential blade is formed by the third rake angle surface 12 and is 35 degrees.

[0084] By providing the auxiliary chip groove with the third rake angle of the peripheral blade, the chip flow direction can be effectively guided, the cutting resistance can be reduced, the cutting temperature can be lowered, the friction between the chips and the front cutting edge of the peripheral blade can be effectively suppressed, the chip removal efficiency can be improved, the generation of crescent-shaped wear on the front cutting edge can be effectively suppressed, and the tool life can be further improved.

[0085] Example 3

[0086] This embodiment discloses another integral carbide milling cutter, which is basically the same as Example 1, except that the spacing between two adjacent groove segments in this embodiment is about 3 mm, thereby forming a reinforcement portion, namely a circumferential blade reinforcement rib, that is, the width of the reinforcement rib is 3 mm, and the length of each groove segment is 3 times the spacing, that is, 9 mm.

[0087] Example 4

[0088] As shown in Figures 11 to 13, this embodiment discloses a solid carbide milling cutter, comprising a body portion 100, a shank portion 300 for connection to a machine tool, and a neck portion 200 connecting the body portion and the shank portion. The body portion 100 is made of solid carbide and has four peripheral cutting edges 110 and four primary chip flutes 120 corresponding to the peripheral cutting edges. The primary chip flutes are spiral flutes with an angle of 15 degrees. The transition edges of the milling cutter are chamfered. A secondary chip groove 10 is provided on the front cutting edge of the peripheral blade, and the secondary chip groove extends in the length direction along the direction of the peripheral blade edge. The secondary chip groove 10 has a groove surface close to the peripheral blade edge, which is a second front angle surface, so that the groove surface of the secondary chip groove close to the peripheral blade edge forms a second front angle of the peripheral blade, and the second front angle of the peripheral blade is greater than the corresponding first front angle of the peripheral blade, and the secondary chip groove has a plurality of groove segments, wherein the spacing between two adjacent groove segments is about 2 mm, thereby forming a reinforcement portion, namely a peripheral blade reinforcement rib (not shown in the figure), and the length of each groove segment is 10 times the spacing, that is, 20 mm.

[0089] The diameter of the main body is 25 mm, the width of the secondary chip groove is 2 mm, the depth of the secondary chip groove is 0.8 mm, and the distance between the secondary chip groove and the peripheral cutting edge is greater than or equal to 0.01 mm and less than or equal to 0.015 mm.

[0090] The main body 100 has a milling cutter bottom surface, which is provided with a plurality of bottom cutting edges 130. These bottom cutting edges 130 are arranged corresponding to the peripheral cutting edges 110. As shown in FIG13 , each bottom cutting edge 130 independently has a bottom cutting edge rake face 131, a bottom cutting edge flank face 132, and a bottom cutting edge 133. The connection between the bottom cutting edge 130 and the peripheral cutting edge 110 is a cutting edge 140. This cutting edge is arc-shaped and has a cutting edge chip breaker 30 disposed thereat. The arc radius is 6 mm.

[0091] The secondary chip groove can significantly improve the sharpness of the peripheral blade edge and effectively reduce the cutting resistance. The peripheral blade reinforcement rib can play a good chip breaking role, thereby effectively controlling the length of the chips, improving the chip removal efficiency, and reducing the friction and extrusion force between the chips and the workpiece, thereby significantly improving the surface finish of the product. The design of the peripheral blade reinforcement rib enhances the strength of the milling cutter edge, reduces the occurrence of chipping, and effectively improves the processing life of the milling cutter. The setting of the secondary chip groove increases the carrying space of the cutting fluid, and the peripheral blade reinforcement rib enhances the turbulence of the cutting fluid, improves the cooling efficiency, achieves a sufficient cooling effect on the tool edge and chips, suppresses the heat generated during the cutting process, thereby significantly improving the processing efficiency, and greatly extending the service life of the tool. This improvement successfully solves the industry problem of difficult processing of high-temperature alloy materials.

[0092] Example 5

[0093] As shown in Figures 14 to 16, this embodiment discloses a solid carbide milling cutter, which is a ball-end milling cutter. It includes a body portion 100, a shank portion 300 for connecting to a machine tool, and a neck portion 200 connecting the body portion and the shank portion. The body portion 100 is made of solid carbide and has two peripheral cutting edges 110 and two main chip flutes 120 corresponding to the peripheral cutting edges. The main chip flutes are spiral flutes with an angle of 30 degrees. A secondary chip groove (not shown in the figure) is provided on the front cutting edge of the peripheral blade, and the secondary chip groove extends in the length direction along the direction of the peripheral blade edge. The secondary chip groove has a groove surface close to the peripheral blade edge, which is a second front angle surface, so that the groove surface of the secondary chip groove close to the peripheral blade edge forms a second front angle of the peripheral blade, and the second front angle of the peripheral blade is greater than the corresponding first front angle of the peripheral blade, and the secondary chip groove has a plurality of groove segments, wherein the spacing between two adjacent groove segments is about 0.6 mm, thereby forming a peripheral blade reinforcement rib (not shown in the figure), and the length of each groove segment is 10 times the spacing, that is, 6 mm.

[0094] The diameter of the main body is 25 mm, the width of the secondary chip groove is 0.8 mm, the depth of the secondary chip groove is 0.3 mm, and the distance between the secondary chip groove and the peripheral cutting edge is about 0.01 mm.

[0095] As shown in Figures 15 and 16, the main body 100 has a milling cutter bottom surface, which has a bottom cutting edge 130 on the bottom surface of the milling cutter. The connection between the bottom cutting edge 130 and the peripheral cutting edge 110 is a cutting tip 140. The bottom cutting edge 130 and the cutting tip 140 are arc-shaped, and a cutting tip chip breaker 30 is provided at the position of the cutting tip. For a ball-end milling cutter, the bottom cutting edge includes a chisel edge located at the end. There is no clear distinction between the bottom cutting edge and the cutting tip. The partially arc-shaped cutting edge near the chisel edge can also be considered as part of the bottom cutting edge. The cutting tip chip breaker 30 extends to the position of the bottom cutting edge 130.

[0096] The secondary chip groove and the tip chip breaker groove can significantly improve the sharpness of the cutting edge and effectively reduce the cutting resistance. In the prior art, the grinding wheel cannot be used to process this part. The inventor of the present application unexpectedly found that the front cutting edge can be processed by femtosecond laser processing equipment to form the secondary chip groove and chip breaker groove described in the present application, and circumferential blade reinforcement ribs are provided. The circumferential blade reinforcement ribs can play a good role in chip breaking and improving the strength of the cutting edge, thereby effectively controlling the length of the chips, improving the chip removal efficiency, and reducing the friction and extrusion force between the chips and the workpiece, thereby significantly improving the surface finish of the product. The design of the circumferential blade reinforcement ribs enhances the strength of the milling cutter edge, reduces the occurrence of chipping, and effectively improves the processing life of the milling cutter. The setting of the auxiliary chip groove increases the carrying space of the cutting fluid, and the peripheral blade reinforcement ribs enhance the turbulence of the cutting fluid, improve the cooling efficiency, achieve sufficient cooling effect on the tool edge and chips, suppress the heat generated during the cutting process, thereby significantly improving the processing efficiency and greatly extending the service life of the tool, successfully solving the problem of excessive temperature in metal cutting and solving the industry problem of difficult processing of high-temperature alloy materials.

[0097] Example 6

[0098] As shown in Figures 17 to 19, this embodiment discloses a solid carbide milling cutter, which includes a body portion 100, a shank portion 300 for connecting to a machine tool, and a neck portion 200 connecting the body portion and the shank portion, wherein the body portion 100 is made of solid carbide, the body portion 100 has four peripheral cutting edges 110 and four main chip grooves 120 corresponding to the peripheral cutting edges, the main chip grooves are spiral grooves, the angle of the spiral grooves is 25 degrees, the peripheral cutting edges 110 each independently have a peripheral cutting edge rake face 111, a peripheral cutting edge flank face 112 and a peripheral cutting edge 113, wherein The circumferential blade rake face 111 forms a circumferential blade first rake angle at each location of the circumferential blade edge 113, and is characterized in that a secondary chip groove 10 is provided on the circumferential blade rake face 111, and the secondary chip groove extends in the length direction along the direction of the circumferential blade edge 113, and the secondary chip groove 10 has a groove surface 11 close to the circumferential blade edge and a groove surface 13 away from the circumferential blade edge, and the groove surface 11 close to the circumferential blade edge is a second rake angle surface, so that the groove surface 11 of the secondary chip groove close to the circumferential blade edge forms a circumferential blade second rake angle, and the circumferential blade second rake angle is greater than the corresponding circumferential blade first rake angle, which is basically consistent with Example 1.

[0099] The difference is that a plurality of reinforcing portions are provided in the secondary chip groove 10, and the reinforcing portions are protrusions 14 provided on the groove surface 13 away from the peripheral cutting edge. The protrusions 14 reduce the cross-sectional area of ​​the secondary chip groove at the protrusions by more than 30%, thereby making the secondary chip groove have a plurality of groove segments, wherein the width of the reinforcing portion is 1 mm, and the length of each groove segment is 6 mm.

[0100] FIG19 is a partial schematic diagram of a secondary chip flute 10 having a plurality of protrusions 14 disposed on the flute surface 13 distal from the peripheral cutting edge. Points a, b, c, and d in the figure are points on the flute surface 13 distal from the peripheral cutting edge. The line segments corresponding to points a, b, c, and d exemplarily illustrate the directions of the secondary chip flute cross-sections at these points. After the protrusions are provided, the cross-sectional area of ​​the secondary chip flute at the protrusions (i.e., the cross-sectional area between points a and b) is reduced by more than 30% relative to the cross-sectional area of ​​the secondary chip flute without the protrusions (i.e., the cross-sectional area at point c). In other words, the protrusions 14, which serve as reinforcements, extend from point a to point b in FIG19. The distance between points a and b represents the width of the reinforcement. Similarly, the cross-sectional area of ​​the secondary chip flute at point d is reduced by more than 30% relative to that at point c. Point d represents another reinforcement, and the distance between points b and d represents the length of one flute segment.

[0101] The protrusions are located on the groove surface away from the peripheral cutting edge. Once chips enter the secondary chip groove, they break or separate them. This effectively controls chip length, reduces chip size, improves chip removal efficiency, and effectively suppresses heat accumulation during cutting. The protrusions also increase the turbulence of the cutting fluid, further enhancing cooling.

[0102] Cutting test

[0103] Metal cutting tests were conducted using the solid carbide milling cutters of Examples 1, 2, and 3 of the present application. A solid carbide milling cutter without a secondary chip flute served as Control 1, and a solid carbide milling cutter with a secondary chip flute but no reinforcement (i.e., no circumferential edge reinforcement ribs or protrusions) served as Control 2. The materials used were titanium alloy, nickel-based alloy, aluminum alloy, and stainless steel, respectively. The workpieces were 100 mm by 50 mm by 25 mm internal cavities. The trials were conducted using a Hammer C42 lathe. Anmei Technology Co., Ltd.'s SF15 water-soluble cutting fluid was used as the cutting fluid.

[0104] The processing conditions of different processing materials are as follows:

[0105] Table 1 Titanium alloy processing conditions

[0106] Table 2 Processing of nickel-based alloys

[0107] Table 3 Aluminum alloy processing conditions

[0108] Table 4 Stainless steel processing

[0109] As can be seen from the table above, by adopting the technical solution of the present application, the chip size is significantly reduced, and the processing linear speed and feed per tooth of the tool are improved to varying degrees. The tools of Examples 1 and 2 can be set with a higher feed per tooth, reaching about 1.5 to 3 times that of the prior art. The tool processing life is increased by about 2-3 times compared with the prior art. The cutting performance of the tool is significantly improved. The tools in Examples 4, 5, and 6 of the present application can also achieve the technical effects in the above table compared with the prior art.

[0110] Edge wear comparison

[0111] After completing the titanium alloy cutting test, the cutting edges of the milling cutter of Example 1 and the milling cutter of Control 1 were partially enlarged for comparison. The comparison of cutting edge wear is shown in Figure 20. The left side of Figure 20 shows the cutting edge wear of the milling cutter of Example 1, and the right side shows the cutting edge wear of the milling cutter of Control 1. It can be seen that the cutting edge in the left figure has almost no obvious wear, while the cutting edge on the right is severely worn. The arrows indicate the two crescent-shaped grooves produced on the rake face of the milling cutter of Control 1. Due to wear on the cutting edge, the friction force increases, resulting in thermal cracks. This shows that the provision of the auxiliary chip groove of the reinforced portion can significantly reduce tool wear and extend the service life of the tool.

[0112] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A solid carbide milling cutter, comprising a body portion, an optional shank portion for direct or indirect connection with a machine tool, and an optional neck portion connecting the body portion and the shank portion, wherein the body portion is made of solid carbide, The body portion has a plurality of peripheral cutting edges and a plurality of main chip grooves corresponding to the peripheral cutting edges, wherein the peripheral cutting edges each independently have a peripheral cutting edge rake face, a peripheral cutting edge flank face and a peripheral cutting edge, wherein the peripheral cutting edge rake face forms a peripheral cutting edge first rake angle at each location of the peripheral cutting edge, characterized in that: A secondary chip groove is arranged on the front cutting edge of the peripheral blade, and the secondary chip groove extends in the length direction along the direction of the peripheral blade edge. The secondary chip groove has a groove surface close to the peripheral blade edge and a groove surface away from the peripheral blade edge. The groove surface close to the peripheral blade edge is a second front angle surface, so that the groove surface of the secondary chip groove close to the peripheral blade edge forms a second front angle of the peripheral blade, and the second front angle of the peripheral blade is greater than the corresponding first front angle of the peripheral blade, and one or more reinforcement parts are arranged in the secondary chip groove, and the reinforcement part is a reinforcement rib or a protrusion arranged on the groove surface away from the peripheral blade edge. The protrusion reduces the cross-sectional area of ​​the secondary chip groove at the protrusion by more than 30%, so that the secondary chip groove has multiple groove segments, wherein the width of the reinforcement part is 0.1mm to 5mm, or 0.3mm to 3mm.

2. The solid carbide milling cutter according to claim 1, characterized in that: The second rake angle of the peripheral blade is greater than the first rake angle of the peripheral blade by 3 degrees to 45 degrees, for example, by 5 degrees to 35 degrees.

3. The solid carbide milling cutter according to claim 1, characterized in that: The main chip groove is a spiral groove, and the angle of the spiral groove is the angle between the spiral direction and the milling cutter spindle. The angle of the spiral groove is between 3 and 55 degrees, such as 15 to 50 degrees, such as 25 to 45 degrees.

4. The solid carbide milling cutter according to claim 2, characterized in that: The width of the reinforcement portion is 0.5 mm to 2.0 mm, and the length of each groove segment is 2 to 15 times the width.

5. The solid carbide milling cutter according to claim 1, characterized in that: The width of the secondary chip groove is 0.15 mm to 3 mm or 3% to 30% of the diameter of the body part.

6. The solid carbide milling cutter according to claim 1, characterized in that: The depth of the secondary chip groove is 0.1 to 2 mm, or 0.3 to 1.5 mm.

7. The solid carbide milling cutter according to claim 1, characterized in that: The diameter of the body portion is 1 mm to 50 mm, for example, 5 mm to 40 mm, 6 mm to 25 mm.

8. The solid carbide milling cutter according to claim 6, characterized in that: The depth of the secondary chip groove is 0.2 to 0.8 times, for example, 0.3 to 0.6 times, the width of the secondary chip groove.

9. The solid carbide milling cutter according to claim 1, characterized in that: The main body part has a milling cutter bottom surface, and the milling cutter bottom surface is provided with multiple bottom cutting edges, and the bottom cutting edges each independently have a bottom edge rake face, a bottom edge flank face and a bottom edge. The bottom cutting edge is arranged corresponding to the peripheral cutting edge, and the connection between the bottom cutting edge and the peripheral cutting edge is a tool tip, and a tool tip chip breaker groove is arranged at the position of the tool tip. Optionally, the tool tip is arc-shaped.

10. The solid carbide milling cutter according to claim 1, characterized in that: The distance between the secondary chip groove and the peripheral cutting edge is greater than or equal to 0.005mm and less than or equal to 0.2mm, greater than or equal to 0.006mm and less than or equal to 0.15mm, greater than or equal to 0.01mm and less than or equal to 0.18mm, greater than or equal to 0.02mm and less than or equal to 0.17mm, greater than or equal to 0.008mm and less than or equal to 0.1mm, greater than or equal to 0.009mm and less than or equal to 0.09mm, greater than or equal to 0.01mm and less than or equal to 0.015mm.

11. The solid carbide milling cutter according to claim 1, characterized in that: The milling cutter is one of the following: an end mill, a ball end mill, a taper milling cutter, a ball end taper milling cutter, a drum milling cutter, and a bull nose milling cutter.

12. The solid carbide milling cutter according to claim 1, characterized in that: The secondary chip groove further includes a third rake angle surface adjacent to the second rake angle surface, wherein the third rake angle surface forms a third rake angle of a peripheral edge, and the third rake angle of the peripheral edge is greater than the corresponding second rake angle of the peripheral edge.

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