CN118080947A

CN118080947A - Integral hard alloy milling cutter with arc-shaped chip groove

Info

Publication number: CN118080947A
Application number: CN202410446908.9A
Authority: CN
Inventors: 张新奇
Original assignee: Egrite Cutting Technology Shanghai Co ltd
Current assignee: Egrite Cutting Technology Shanghai Co ltd
Priority date: 2024-04-15
Filing date: 2024-04-15
Publication date: 2024-05-28

Abstract

The application provides an integral hard alloy milling cutter with arc-shaped chip grooves, which comprises a cutter body and a cutter head, wherein a chip groove extending along an arc-shaped cutting edge is arranged on the front cutter surface of the cutter head, the chip groove forms a groove surface of the arc-shaped cutting edge and is a first rake angle surface, the first rake angle surface forms a first rake angle at each position of the arc-shaped cutting edge, the chip groove is provided with a second rake angle surface connected with the first rake angle surface to form a second rake angle, and the second rake angle is larger than the corresponding first rake angle. The cutting edge has the advantages that the cutting groove is added on the front cutter face of the arc-shaped cutting edge, so that the sharpness of the cutting edge can be remarkably improved, the phenomenon of cutting stress concentration possibly occurring in the cutting process is effectively reduced, and chips generated in the cutting process can be smoothly discharged in time, so that the cutting quality is improved, and the smoothness and the precision of the surface of a workpiece are ensured.

Description

Integral hard alloy milling cutter with arc-shaped chip groove

Technical Field

The invention relates to the technical field of milling cutters, in particular to an integral hard alloy milling cutter with arc-shaped chip grooves.

Background

The milling cutter is usually used for high-speed cutting, has higher milling speed and no idle stroke, and is a high-efficiency cutting processing method, but has large impact and larger vibration during processing. The design of the different edge shapes of the milling cutter helps to guide the cutting edge to make accurate cutting easier during cutting. For example, ball nose mills incorporating arcuate cutting edges are a common type of milling cutter suitable for processing workpieces of various shapes and contours, including parts with curved and complex contours, with spherical cutting edge designs that allow cutting in different directions, improved machining flexibility, suitability for multi-axis machining, more flexible processing of different faces of the workpiece, higher machining efficiency and better machining quality. For cutters such as ball end mills, nose mills and the like comprising arc-shaped cutting edges, radians and cutting angles at different points of the cutting edges are different, so that sharpness of the cutting edges and smooth discharge of chips are affected, the surface quality of a workpiece is reduced, the stress condition of the arc-shaped cutting edges is more complex, the cutting edges are prone to edge collapse due to overlarge local stress, and cutting efficiency and cutter service life are greatly limited. The milling cutter in the prior art has the problems of poor machining precision, low cutting efficiency, short service life and the like, and cannot meet the industrial requirements. In particular to difficult-to-process materials such as titanium alloy, nickel-based alloy, stainless steel, high polymer materials and the like, which are limited by factors such as cutting force, cutting heat and the like, high-efficiency processing is difficult to realize, production efficiency is limited, and the difficult problem of industry is caused.

Disclosure of Invention

The invention provides an integral hard alloy milling cutter with arc-shaped chip flutes, which comprises the following embodiments:

embodiment 1, an integral cemented carbide milling cutter with arcuate chip flutes, comprising a cutter body, a cutter head, and optionally a shank for direct or indirect connection to a machine tool,

The cutter body is provided with a plurality of cutter body chip flutes,

The tool bit is provided with a plurality of tool bit chip flutes connected with the tool body chip flutes,

The surface of the tool bit chip flute facing the cutting rotation direction is the tool bit front tool surface,

The front cutter face of the cutter head is intersected with the peripheral surface of the cutter head to form a cutter head cutting edge for cutting, the cutter head cutting edge comprises an arc-shaped section, namely an arc-shaped cutting edge, and is characterized in that,

The front cutter face of the cutter head is provided with a chip groove extending along the arc-shaped cutting edge,

The chip groove forms a groove surface of the arc-shaped cutting edge and is a first rake surface, the first rake surface forms a first rake at each position of the arc-shaped cutting edge,

The chip flute has a second rake surface connected to the first rake surface forming a second rake angle, the second rake angle being greater than the corresponding first rake angle. In some embodiments, the monolithic carbide milling cutter with arcuate chip flutes has a diameter of 1mm to 50mm.

Embodiment 2, the solid carbide milling cutter with arc-shaped chip flutes according to embodiment 1, characterized in that the cutter head is a ball head, the arc-shaped cutting edge is arc-shaped and extends on the ball head to a position which is less than 1/2R from the central axis of the milling cutter, the first rake angle of the arc-shaped cutting edge is varied, and the farther it is from the central axis of the milling cutter, the larger it is.

Embodiment 3, the solid carbide milling cutter with arc-shaped chip flutes according to embodiment 1, wherein the cutter head has a bottom surface remote from the cutter body, the arc-shaped cutting edge extends to the bottom surface, and the clearance treatment is performed in a region of the bottom surface where the arc-shaped cutting edge is not provided.

Embodiment 4, the solid carbide milling cutter with curved chip flutes according to embodiment 3, characterized in that the first rake angle of the curved cutting edge is varied, which decreases the further it is from the central axis of the milling cutter.

Embodiment 5, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1, wherein the first rake angle is 2 to 20 degrees, such as 5 to 15 degrees, and the second rake angle is 7 to 25 degrees, such as 10 to 20 degrees.

Embodiment 6, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1, wherein the second rake angle is 2 to 20 degrees greater than the corresponding first rake angle.

Embodiment 7, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1, wherein the width of the first rake face is 30% -75%, such as 40% -70%, such as 50% -60% of the feed per tooth.

Embodiment 8, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1, characterized in that the chip flutes extend to the flute faces of the insert body chip flutes.

Embodiment 9, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1 or 2, characterized in that the chip flutes increase in width gradually in a direction away from the central axis of the milling cutter.

Embodiment 10, the solid carbide milling cutter with curved chip flutes according to embodiment 1, characterized in that the insert flutes extend helically in the axial direction of the insert body with a helix angle of between 3 and 45 degrees, such as 10 to 30 degrees, such as 15 to 25 degrees.

Embodiment 11, the solid carbide milling cutter with arcuate chip flutes according to embodiment 1, characterized in that the chip flutes further have third rake faces connected to the second rake faces, forming third rake angles, which are larger than the respective second rake angles.

Embodiment 12, the solid carbide milling cutter with arcuate chip flutes according to embodiment 11, wherein the third rake angle is 10 to 30 degrees, such as 15 to 25 degrees.

Embodiment 13, a solid carbide milling cutter with arcuate chip flutes according to embodiment 1, characterized in that the chip flutes have undulated extending flute surfaces.

Embodiment 14, the solid carbide milling cutter with curved chip flutes according to embodiment 1, characterized in that the cutter head is provided with 4 to 12 cutting edges of the cutter head.

Embodiment 15, a method of producing the solid carbide milling cutter according to any one of embodiments 1 to 14, characterized in that the chip flutes are produced by a machining method that does not cause thermal damage.

Embodiment 16, the method according to embodiment 15, wherein the chip flute is produced by a femtosecond pulse laser machining method.

The technical scheme of the application has the beneficial technical effects that:

1. Improving sharpness and reducing cutting resistance. According to the application, the chip groove extending along the arc-shaped cutting edge is arranged, and the first front angle is formed by the groove surface of the arc-shaped cutting edge, so that the sharpness of the cutting edge is improved along the extending direction of the arc-shaped cutting edge, the cutting resistance is reduced, and the cutting is lighter and faster.

2. Stress concentration of the cutting edge is avoided, and hardening of materials is avoided. The sharpness is improved along the extending direction of the arc-shaped cutting edge, so that cutting force can be more uniformly guided to be dispersed at different parts of the cutter head, stress concentration risks of the cutter at specific points are reduced, dispersion of cutting stress is realized, cutting stress concentration phenomenon of the arc-shaped cutting edge in the cutting process is reduced, abrasion risks of the cutter are reduced, and hardening of materials is avoided.

3. Smooth chip removal is realized, cutter abrasion is reduced, and cutting heat generation is reduced. The chip groove increases the chip containing space and acts as a chip removing channel in the cutting process, thereby being beneficial to discharging chips smoothly in time. The deeper chip groove can be arranged on the premise of ensuring the strength of the cutting edge through the arrangement of the second rake angle, so that larger chip containing and chip removing space is obtained, the risk of chip accumulation in the cutting process is reduced, the accumulation and chip clamping of chips are effectively prevented, the abrasion of a cutter is further reduced, and the heat generated in the cutting process is restrained.

4. The number of teeth is increased, and the processing efficiency is improved. Through setting up the chip groove, cutter blade accessible chip groove obtains great sharpness to can set up more cutting teeth at the tool bit, thereby promote machining efficiency.

By the improvement of the application, the cutters such as the ball end mill, the nose mill and the like with arc-shaped cutting edges are more excellent in processing curved surfaces and workpieces with complex shapes, the abrasion of the cutters is obviously reduced, the service life of the cutters is greatly prolonged, the cutting speed and the processing efficiency are obviously improved, and a stable and efficient cutting process is ensured. The introduction of the chip groove effectively improves the stability of the cutting edge, can improve the cutting efficiency, is more beneficial to improving the cutting quality and ensuring the smoothness and the precision of the surface of a workpiece, and provides a more reliable tool for the precise machining and high-quality cutting of the surface of the workpiece, thereby particularly solving the industrial problem that high-temperature alloy materials are difficult to machine. Under the condition that the machining efficiency is improved by 1.2 to 1.5 times, the service life of the cutter is improved by 2 to 5 times, and even by more than 8 times.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present disclosure, not to limit the present disclosure.

Fig. 1 is an overall construction diagram of a ball nose milling cutter according to embodiment 1;

FIG. 2 is a partial schematic view of a tool tip;

FIG. 3 is an enlarged schematic view of an arcuate edge provided with a chip flute;

FIG. 4 is a cross-sectional view A-A of the selected point of the arcuate edge in FIG. 3;

FIG. 5 is a schematic view of the cutting of the arcuate edge of the ball nose milling cutter;

FIG. 6 is a sectional view of a selected point of the arcuate edge in example 2;

FIG. 7 is an overall construction view of a ball nose milling cutter according to example 3;

FIG. 8 is an enlarged schematic view of an arcuate edge provided with a chip flute;

FIG. 9 is a C-C cross-sectional view of selected points of the arcuate edge of FIG. 8;

FIG. 10 is an overall construction view of a nose milling cutter of example 5;

FIG. 11 is an enlarged schematic view of an arcuate edge provided with a chip flute;

fig. 12 is a schematic cutting view of a nose milling cutter.

Description of the drawings:

100 parts of tool bit, 110 parts of tool bit chip flute, 120 parts of tool bit front tool face, 130 parts of tool bit outer peripheral surface, 140 parts of arc-shaped cutting edge, 150 parts of bottom surface, 151 parts of bottom edge,

200-Blade, 210-blade chip flute,

300-A knife handle, wherein the knife handle is provided with a knife opening,

400-Chip flute, 410-flute face of the arcuate edge (first rake face), 420-second rake face, 430-third rake face, 440-flute face distal to the arcuate edge.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

The application discloses an integral hard alloy milling cutter with arc-shaped chip grooves, which comprises a cutter body, a cutter head and an optional cutter handle, wherein the cutter handle is used for being directly or indirectly connected with a machine tool, the cutter body is provided with a plurality of cutter body chip grooves, the cutter head is provided with a plurality of cutter head chip grooves connected with the cutter body chip grooves, the surface of the cutter head chip groove facing the cutting rotation direction is a cutter head front cutter surface, the cutter head front cutter surface is intersected with the outer peripheral surface of the cutter head to form a cutter head cutting edge for cutting, and the cutter head cutting edge comprises an arc-shaped section, namely an arc-shaped cutting edge. The solid carbide milling cutter with arcuate chip flutes of the present application is a rotary machining tool, the diameter of which is not subject to any limitation, and can be selected by the person skilled in the art according to the actual needs, and can be generally selected to be 0.8mm to 80mm, for example 1mm to 50mm, for example 5mm to 40mm,6mm to 25mm. The diameter according to the present application means the diameter of the outer surface of the cylinder formed during the rotary machining of the cutter head.

According to the application, the chip groove extending along the arc-shaped cutting edge is arranged, and the first front angle is formed by the groove surface of the arc-shaped cutting edge, so that the sharpness of the cutting edge is improved along the extending direction of the arc-shaped cutting edge, the cutting resistance is reduced, the cutting is lighter and faster, the heat generated by cutting is reduced, and the phenomenon of cutting stress concentration possibly occurring in the cutting process is effectively reduced. The chip grooves are introduced to help to guide cutting force more uniformly, so that the chip grooves are effectively dispersed at different positions of the cutter head, the stress concentration risk of the cutter at a specific point is reduced, the dispersion of cutting stress is realized, the stability of a cutting edge is effectively improved, the abrasion risk of the cutter is reduced, the design improvement can not only improve the cutting efficiency, but also be beneficial to improving the cutting quality, and the smoothness and the precision of the surface of a workpiece are ensured. The chip flutes can be provided as desired by those skilled in the art to achieve the desired cutting edge sharpness.

The tip portion of a cutting tool such as a ball nose milling cutter, a nose milling cutter, etc. has a curved or arc shape, and when a cutting force acts on such a varying curvature, uneven stress distribution is easily caused, if the cutting stress is uneven or excessive, scratches, cracks or other defects may occur on the cutting surface, the surface quality of a workpiece is lowered, and at the same time, the local abrasion of the tool is aggravated, the life of the tool is limited, the high-strength cutting stress not only causes the tool to collapse, but also causes plastic deformation of a material or surface hardening of the material, even causes residual stress, and causes deformation or cracking of the material in the subsequent processing or use.

The design of the chip groove can overcome the problem of stress concentration of the arc-shaped cutting edge, avoid material surface hardening, reduce the occurrence of tipping phenomenon and prolong the processing life of the milling cutter.

During milling, chip removal has a significant impact on cutting quality, tool life and machining efficiency. Ball nose mills are generally designed to discharge chips in a helical fashion, with the geometry of the insert and the cutter body being designed so that chips formed during cutting are rapidly discharged along a helical path. The nose of the ball nose milling cutter is spherical, which results in a large curvature of the cutting edge. Because the chip flow path on the spherical tip is relatively complex, the chip may encounter a large resistance in the flow process, increasing the difficulty of discharge. If the cutting angle at the tip is large, the chip may be more likely to be caught at the tip, resulting in excessive heat generated at the tip by the chip, causing it to adhere to the tip, and greatly reducing the machining quality and life of the tool.

The chip groove design of the application not only can improve the sharpness of the cutting edge, but also can guide the flow direction of chips and reduce the interference of the chips on a cutter and a workpiece. On the other hand, the chip accommodating space is further increased through the design of the chip groove, the chip groove serves as a chip removing channel in the cutting process, chips generated in the cutting process can be smoothly discharged in time, the risk of chip accumulation in the cutting process is reduced, the chips can be discharged in time and smoothly, and chip accumulation and chip clamping are effectively prevented.

According to the application, the second rake angle larger than the corresponding first rake angle is further arranged, so that on the premise of ensuring the strength and the collapse resistance of the cutting edge, the deeper chip grooves can be arranged through the larger second rake angle, the chip capacity and space are increased, the abrasion of the cutter is further reduced, and the service life of the cutter is prolonged.

The terms in the present application have meanings commonly understood by those skilled in the art. For a metal cutting tool, the included angle between the rake face and the base surface is the rake angle, the first rake angle of the application refers to the included angle between the groove face (i.e. the first rake angle face) of the arc-shaped cutting edge and the base surface in the measuring plane of the rake angle, and the second rake angle of the application refers to the included angle between the second rake angle face and the base surface in the measuring plane of the rake angle.

For selected points on the cutting edge where no chip flute is provided, it has a rake angle formed by the rake surface. For a selected point on the cutting edge provided with the chip flute, the cutting edge is provided with a first rake angle and a second rake angle which are respectively formed by a flute surface (namely a first rake angle surface) and a second rake angle surface of the arc-shaped cutting edge, and the first rake angle is the corresponding first rake angle of the second rake angle.

The term "cemented carbide" in the present application has a common meaning understood by those skilled in the art, and in the art, cemented carbide is a powder metallurgy product sintered in a vacuum furnace or a hydrogen reduction furnace using carbide (WC, tiC) micron-sized powder of a refractory metal with high hardness as a main component, cobalt (Co) or nickel (Ni), molybdenum (Mo) as a binder. It has much higher resistance than high-speed steel, about 800-1000 deg.C, and the allowable cutting speed is about 4-10 times that of high-speed steel. The hardness is very high, can reach (89-91) HRA, and can reach 93HRA; but its flexural strength is 1.1-1.5GPa, only half of high speed steel; the impact toughness is about 0.04MJ/m ², which is less than 1/25-1/10 of the high-speed steel. The heat resistance and the wear resistance of the cutting tool are good, so that the cutting tool has increasingly application to cutting tools with less complex edge shapes. The cemented carbide of the present application comprises one selected from the group consisting of: such as tungsten-cobalt (WC-Co) cemented carbide, tungsten-titanium-cobalt (WC-T i-Co) cemented carbide, tungsten-titanium-tantalum (niobium) cemented carbide (WC-TaC (NbC) -Co), tungsten-titanium-cobalt-tantalum (niobium) cemented carbide and the like, cemented carbide based on WC, tiC-based cemented carbide, ultrafine grain cemented carbide, steel cemented carbide, coated cemented carbide and the like.

The high-temperature alloy is also called as heat-resistant alloy, and in the prior art, the reason that the high-temperature alloy material is difficult to cut is as follows: 1. high-temperature strength and high work hardening tendency. During cutting, the plastic deformation resistance is high, the cutting load is heavy, the cutting temperature is high, and the unit cutting force of the general nickel-based superalloy is 50% higher than that of the medium carbon steel; the surface layer after processing has large processing hardening and residual stress, and the hardening degree can reach 200-500%; the abrasion of the knife tip and the boundary is extremely serious, and the groove abrasion of the auxiliary rear knife face is also extremely easy to occur. 2. The thermal conductivity is poor. The heat conductivity is about 1/5-1/2 of that of 45 steel, so the cutting temperature is high. Studies have shown that about 40% of the heat builds up in the region of the cutting edge of the tool, about 40% of the heat builds up on the chip, about 20% on the cutting material, and tends to harden the material when working with the heat resistant alloy. 3. The sticking tendency to the cutter is large. It is very easy to produce built-up tumor, and the quality of the processed surface is affected. 4. The content of the strengthening elements is high. A large number of hard particles such as metal carbide and intermetallic compound with strong abrasive property are formed in the alloy, and the hard particles have strong abrasion effect on the cutter. Wear of the tool surface to the workpiece or cutting surface greatly affects tool life, machining efficiency and machining accuracy. For example, the "cold welding" phenomenon that occurs when the tool and workpiece materials are subjected to sufficiently high pressures and temperatures is the result of atomic adsorption between the fresh surface atoms of the friction surface. The bonding point of the two friction surfaces is torn and taken away by the other side due to the relative movement, and if the breakage of the bonding point occurs on one side of the cutter, the cutter is worn. Cutting temperature is a major factor affecting cohesive wear. The higher the cutting temperature, the more severe the bond wear.

The technical scheme of the application can improve the sharpness of the cutting edge, reduce the cutting force, enhance the abrasion resistance of the cutting edge, increase the chip containing space by the existence of the chip groove and act as a chip removing channel in the cutting process, thereby being beneficial to smoothly discharging chips generated in the cutting process in time, improving the cutting performance in multiple aspects, improving the processing efficiency and improving the surface quality of products. Provides a reliable solution for processing high-temperature alloy materials.

In some embodiments, the cutting head is a ball head, the arcuate cutting edge is rounded and extends on the ball head to less than 1/2R from the central axis of the milling cutter, and the first rake angle of the arcuate cutting edge varies more and more from the central axis of the milling cutter. Wherein R is the radius of the arc-shaped cutting edge or the radius of the ball head.

For the ball end mill, the ball end mill uses the central axis as the rotation axis during cutting, the cutting edge line speed of the cutting edge which is closer to the central axis is slower, and a smaller rake angle is required to obtain higher edge strength so as to improve the anti-collapse property of the cutting edge. Conversely, the farther from the central axis of the milling cutter, the faster the edge line speed, the greater the cutting speed, and the greater the cutting thickness, the greater the cutting thickness increase resulting in greater cutting force, higher cutting temperature, and therefore, the need to increase the rake angle to increase the sharpness of the edge. The larger the first rake angle, the sharper the edge and the less cutting resistance. The first rake angle is larger at the position that the cutting edge is far away from the central axis of the milling cutter, so that cutting resistance of the whole cutting edge of the ball end milling cutter is distributed more uniformly during cutting, cutting stress concentration or overlarge is avoided, the cutting stress is more excellent during cutting of curved surfaces and workpieces with complex shapes, stable and efficient cutting processes are ensured, and a more reliable tool is provided for precision machining and high-quality cutting of the surfaces of the workpieces. The adjustment can ensure that the cutting edge can maintain ideal cutting performance at different positions, and the service life of the cutter is prolonged.

In some embodiments, the cutter head has a bottom surface remote from the cutter body, the arcuate cutting edge extends to the bottom surface, and the clearance treatment is performed in an area of the bottom surface where the arcuate cutting edge is not provided.

For the ox nose milling cutter, the outer peripheral surface of the cutter head comprises a bottom surface and a transition surface for connecting the outer peripheral surface of the cutter body with the bottom surface, the bottom surface and the transition surface of the cutter head intersect with the front cutter surface of the cutter head to form a bottom edge and an R angle (also called R edge), and the bottom surface close to the central axis does not directly participate in cutting, so that the clearance treatment is carried out in the area of the bottom surface, where the arc-shaped cutting edge is not arranged.

In some embodiments, the first rake angle of the arcuate cutting edge varies, with decreasing distance from the central axis of the milling cutter. Unlike ball nose milling cutters, which are mainly used for side wall cutting or bottom edge cutting, the high-speed machining needs to ensure the strength of the cutting edge at the cutter tip, the edge line speed of the R angle of the cutting part is not significantly affected by the distance from the central axis like ball nose milling cutters, and the thinner the cutting edge is, the larger the first rake angle is needed, so that the farther the first rake angle is from the central axis of the milling cutter, the smaller the strength of the R edge is ensured.

In some embodiments, the first rake angle is 2 to 20 degrees, such as 5 to 15 degrees, and the second rake angle is 7 to 25 degrees, such as 10 to 20 degrees. The application sets the first front angle to improve the sharpness of the arc-shaped cutting edge, but too high sharpness can reduce the strength and the collapse resistance of the cutting edge, so the first front angle is not too large. Through setting up the second rake angle that is greater than corresponding first rake angle, can not influence the sharpness and the anti resistance to collapse of blade when the chip flute depth is showing to increase, deeper chip flute can increase and hold bits chip space, and smooth and easy chip removal heat dissipation of being convenient for can improve the holding space of coolant liquid simultaneously, further improves the cooling effect. The first rake angle can be set to achieve the effect of sharp cutting edges according to the requirements of the person skilled in the art, and the second rake angle is set to achieve the better chip removal effect. The range of the first rake angle and the second rake angle is set, so that better cutting performance of the cutter can be obtained.

In some embodiments, the second rake angle is 2 to 20 degrees, such as 7 to 15 degrees, greater than the corresponding first rake angle.

In some embodiments, the width of the first rake face is 30% -75%, such as 40% -70%, such as 50% -60%, of the feed per tooth. The width of the first rake face refers to the width of the first rake face in the direction perpendicular to the extension direction of the arc-shaped cutting edge.

In some embodiments, the chip flute extends to a flute face of the insert flute. Therefore, the chips in the chip groove can directly flow into the chip groove of the cutter body, the chip removing effect is improved, and the containing space of the chips and the cooling liquid is further increased.

In some embodiments, the chip flute width increases progressively in a direction away from the central axis of the milling cutter. The width of the chip flute refers to the dimension of the chip flute in the direction perpendicular to the extension of the cutting edge on the rake face of the tool head. The larger the width of the chip groove is, the larger the chip containing space is correspondingly increased, the larger the space through which chips flow is, and the more smooth chip removal can be realized by increasing the width of the chip groove in the direction away from the central axis of the milling cutter.

In some embodiments, the blade flutes extend helically along the blade axis at a helix angle of between 3 and 45 degrees, such as 10 to 30 degrees, such as 15 to 25 degrees. The spiral angle of the spiral groove is the included angle between the spiral direction and the central axis of the milling cutter.

In some embodiments, the chip flute further has a third rake surface connected to the second rake surface forming a third rake angle, the third rake angle being greater than the corresponding second rake angle. The term "third rake angle" in the present application refers to the angle formed by the third rake angle surface in the rake angle measurement plane. For a specific selected point on the cutting edge, a first rake angle, a second rake angle and a third rake angle exist at the same time, wherein the second rake angle is the corresponding second rake angle of the third rake angle of the selected point on the cutting edge. Through the chip groove with the third rake angle, the chip containing space can be further increased, the chip flow direction is guided, the cutting resistance is reduced, the cutting temperature is reduced, the friction between the chip and the rake face and between the chip and the workpiece is inhibited, the chip removal efficiency is improved, and the service life of the cutter is further prolonged.

In some embodiments, the third rake angle is 10 degrees to 30 degrees, such as 15 degrees to 25 degrees.

In some embodiments, the chip flute has a wave-shaped extending flute face. For example, the first rake surface, the second rake surface or the second rake surface has undulated, extending undulations, for example, the chip flute has a flute bottom surface that undulates in a wave, for example, the chip flute has a flute surface opposite to the flute surface of the arcuate cutting edge, i.e., a flute surface distal to the arcuate cutting edge, and the flute surface distal to the arcuate cutting edge undulates in a wave. The wavy extending flute surfaces can further reduce the friction of chips with the tool and workpiece surfaces.

In some embodiments, the tool bit is provided with 2 to 12 of the tool bit edges. For example, the cutter head is provided with 2 cutter head cutting edges, or the cutter head is provided with 4 cutter head cutting edges, or the cutter head is provided with 6 cutter head cutting edges, or the cutter head is provided with 8 cutter head cutting edges, or the cutter head is provided with 10 cutter head cutting edges, or the cutter head is provided with 12 cutter head cutting edges. In the prior art, the cutting edge of the cutter head obtains the sharpness of the cutting edge through the grinding angle of the front cutter face of the cutter head, the cutting edge cannot be set according to the required sharpness value, and meanwhile, the number of the cutting edges of the cutter head is limited.

The preparation methods of milling cutters of the prior art are known to the person skilled in the art and comprise the following steps: 1. calculating the shape of the milling cutter according to actual needs and selecting a proper hard alloy bar stock, 2, starting from the hard alloy bar stock, forming a blank of the milling cutter by grinding the hard alloy bar stock, 3, forming a semi-finished product of the milling cutter by finish grinding, and 4, performing PVD coating treatment on the semi-finished product, thereby forming a finished product of the milling cutter.

The application also discloses a method for preparing the integral hard alloy milling cutter, which is characterized in that the chip flute is prepared by adopting a processing method without thermal damage.

The method for preparing the milling cutter mainly comprises the steps of machining the chip groove on the basis of the semi-finished product, and then performing PVD coating treatment on the semi-finished product with the chip groove.

In some embodiments, the chip flutes are prepared using a femtosecond pulse laser machining method.

The chip groove can be manufactured by femtosecond pulse laser processing and forming, for example, a precise numerical control laser machine which is purchased from De Ma Jisen fine machine tool trade company under the trade name LASERTEC Shape can be adopted. It is generally considered that laser forming deteriorates the properties of cemented carbide, for example, heat damage is caused by picosecond and nanosecond processing, a heat damage layer is formed at the chip flute portion, the surface finish is extremely poor, the finishing requirements cannot be satisfied, and the service life of the tool is drastically reduced. Without being limited by theory, it is believed that the reason for this thermally damaged layer is that the oxidation of the cemented carbide, the change in microstructure in the alloy, and the reduction in hardness and wear resistance, which is evident by comparison with the life of a tool without a thermally damaged layer, is often less than half the life of a tool without a thermally damaged layer, and some even degrades to one fifth of the normal life or even less. And the femtosecond pulse laser processing is adopted, so that the speed is extremely high, and the thermal damage can not be caused.

Femtosecond pulse laser processing can also improve or strengthen the performance of the hard alloy. Specific textures or microstructures can be generated on the surface of the hard alloy through femtosecond pulse laser processing, surface nanocrystallization is realized, a complex nanoscale structure can be manufactured on the surface of the hard alloy through high precision and control capability of the femtosecond pulse laser, the method can also be used for introducing beneficial residual stress into a hard alloy material, repairing microcracks or damages of the hard alloy tool, recovering the surface integrity of the hard alloy tool through partial melting and resolidification so as to improve the surface performance of the hard alloy tool, and endowing the material with special properties such as increasing hardness, increasing wear resistance and prolonging the fatigue life of the material. The surface processed by the femtosecond pulse laser can reach the finish of 0.1-0.2nm, even can be a mirror surface, and is suitable for finish machining.

After the chip groove is arranged, the sharpness of the cutting edge of the cutter is obviously improved, the cutting resistance is greatly reduced, the chip groove can also improve the chip containing space, the chip removing efficiency is improved, and the friction force and the extrusion force between chips and workpieces are reduced, so that the smoothness of the surface of a product is obviously improved, and the high-precision, high-flexibility and high-efficiency processing is realized.

The above-described ranges may be used alone or in combination. The application will be more readily understood by the following examples.

Examples

Example 1

As shown in fig. 1, the present embodiment discloses an integrated cemented carbide milling cutter with arc-shaped chip flutes, comprising a cutter body 200, a cutter head 100, and a shank 300 for connection to a machine tool, said cutter body 200 having a taper. The blade is provided with four blade flutes 210 extending helically along the axial direction of the blade, the helix angle of which is 25 degrees. The cutter head is provided with four cutter head chip flutes 110 connected with the cutter body chip flutes.

Fig. 2 is a partial schematic view of a tool tip 100, which is a ball head with a radius of 5mm. The surface of the cutter head chip flute 110 facing the cutting rotation direction is a cutter head front cutter face 120, the cutter head front cutter face 120 is intersected with the outer peripheral surface 130 of the cutter head to form a cutter head cutting edge for cutting, the cutter head is provided with four cutter head cutting edges, and the cutter head cutting edge comprises an arc-shaped section, namely an arc-shaped cutting edge 140. The arc-shaped cutting edge is arc-shaped and extends to a position which is less than 1/2R away from the central axis of the milling cutter on the ball head. The head rake face is provided with chip flutes 400 extending along the arcuate cutting edges.

Fig. 3 shows one arcuate cutting edge 140 provided with a chip flute 400, which chip flute 400 forms a flute surface 410 of the arcuate cutting edge, being a first rake surface forming a first rake angle at each of the arcuate cutting edges 410, which chip flute has a second rake surface 420 connected to the first rake surface 410 forming a second rake angle, which is greater than the corresponding first rake angle.

Fig. 4 shows a cross-sectional view A-A of the arcuate cutting edge 140 of fig. 3 at a selected point a, the cross-sectional plane A-A of fig. 4 being perpendicular to the arcuate cutting edge 140 at point a. The first rake angle a and the second rake angle β at a selected point a on the arcuate cutting edge 140 are exemplarily shown in fig. 4 where the chip flute 400 is provided. The first rake angle α is the angle between the slot surface 410 (i.e., the first rake angle) and the base surface of the arc-shaped cutting edge, and is about 10 degrees, and the second rake angle β is the angle between the second rake angle 420 and the base surface, and is about 20 degrees, and the imaginary line forming the common edge of the first rake angle α and the second rake angle β in fig. 4 is located on the base surface, and coincides with the connecting line between the cutting edge selection point a and the center line of the tool, which may be referred to as a base line or a reference line. In the case where no chip flute is provided, the rake angle at the selected point a on the arcuate cutting edge 140 is negative by the angle between the head rake surface 120 and the base surface.

Through set up along the chip groove that arc blade extends, through the groove surface of arc blade forms first rake to improve the sharpness of blade along the extending direction of arc blade, reduce cutting resistance, make the cutting lighter and faster. Through setting up the second rake angle that is greater than corresponding first rake angle for under the prerequisite of guaranteeing blade intensity, anti resistance to collapse, can set up deeper chip groove through great second rake angle, increase and hold bits chip space, further reduce cutter wearing and tearing, improvement cutter life.

The first rake angle of the arcuate cutting edge varies, increasing from about 8 degrees closest to the central axis of the milling cutter to about 18 degrees furthest from the central axis of the milling cutter, the second rake angle being about 10 degrees greater than the corresponding first rake angle. Fig. 5 is a schematic cutting diagram of an arc-shaped cutting edge of a ball-end mill, which shows a cutting point a and a cutting point b, wherein the cutting point a is closer to a central axis of the mill, the cutting point b is farther from the central axis of the mill, and the ball-end mill uses the central axis as a rotation axis during cutting, so that a smaller rake angle is required to obtain higher cutting edge strength when cutting, thereby improving the anti-collapse property of the cutting edge. The cutting edge at the cutting point b has a high line speed and a larger cutting thickness, so that it is necessary to increase the rake angle to improve the sharpness of the cutting edge to reduce the cutting resistance. Through the first rake angle of change for the cutting resistance distribution of whole blade is more even when cutting by ball nose milling cutter, avoids cutting stress concentration or too big, and the performance is more outstanding when cutting curved surface and complex shape's work piece.

The width of the first rake face is about 0.05mm, which is between 55% and 65% of the feed per tooth of the tool. The chip flute extends to the flute surface of the blade chip flute 210, thereby enabling smoother chip removal and further increasing the chip and coolant receiving space.

As shown in fig. 3 and 4, the chip flute has a flute surface opposite to the flute surface 410 of the arc-shaped cutting edge, namely, a flute surface 440 far away from the arc-shaped cutting edge, and the flute surface 440 far away from the arc-shaped cutting edge undulates in a wave shape, so that the chip flute has a wave-shaped extended flute surface, the chip is discharged more smoothly, and the friction between the chip and the surfaces of the tool and the workpiece is further reduced.

Example 2

This example discloses a solid carbide milling cutter with arc-shaped chip flutes, which is substantially identical to example 1, except that:

The first rake angle of the arc-shaped cutting edge does not change obviously along with the distance between the arc-shaped cutting edge and the central axis of the milling cutter, and the first rake angles at different points of the arc-shaped cutting edge are basically consistent and are about 10 degrees.

The chip groove is not provided with a groove surface extending in a wave shape, and each surface of the chip groove extends smoothly without wave-shaped fluctuation.

The chip flute also has a third rake surface 430 connected to the second rake surface 420, forming a third rake angle, which is greater than the corresponding second rake angle. Fig. 6 is a sectional view of the same arcuate cutting edge as in embodiment 1 at a selected point a, and in the case where a chip flute 400 is provided, a first rake angle α, a second rake angle β, and a third rake angle γ at the selected point a on the arcuate cutting edge 140 are exemplarily shown in fig. 6. The first rake angle α is the angle between the slot surface 410 (i.e., the first rake surface) and the base surface of the arc-shaped cutting edge, and is about 10 degrees, the second rake angle β is the angle between the second rake surface 420 and the base surface, and is about 20 degrees, and the third rake angle γ is the angle between the third rake surface 430 and the base surface, and is about 25 degrees.

Example 3

As shown in fig. 7, the present embodiment discloses an integrated cemented carbide milling cutter with arc-shaped chip flutes, comprising a cutter body 200, a cutter head 100, and a shank 300 for connection to a machine tool. The blade is provided with four blade flutes 210 extending helically along the axial direction of the blade, the helix angle of which is 25 degrees. The cutting head is provided with four cutting head flutes 110 (only two of which are shown by way of example) in connection with the body flutes.

The tool bit 100 is a ball head, and the radius of the ball head is 8mm. The surface of the chip flute 110 facing the cutting rotation direction is a cutter head rake surface 120, the cutter head rake surface 120 intersects with the outer peripheral surface 130 of the cutter head to form a cutter head cutting edge for cutting, the cutter head is provided with four cutter head cutting edges (only two of which are shown in the figure by way of example), and the cutter head cutting edges comprise arc-shaped segments, namely, arc-shaped cutting edges 140. The arc-shaped cutting edge is arc-shaped and extends to a position which is less than 1/2R away from the central axis of the milling cutter on the ball head. The head rake face is provided with chip flutes 400 extending along the arcuate cutting edges.

Fig. 8 shows an arc-shaped cutting edge 140 provided with a chip flute 400, which chip flute 400 forms a flute surface 410 of the arc-shaped cutting edge, being a first rake surface, which forms a first rake angle at each of the arc-shaped cutting edges 410, which chip flute has a second rake surface 420 connected to the first rake surface 410, which forms a second rake angle, which is greater than the corresponding first rake angle.

Fig. 9 shows a C-C section view of the arcuate cutting edge 140 of fig. 8 at a selected point C, and fig. 9 exemplarily shows a first rake angle α and a second rake angle β of the arcuate cutting edge 140 at the selected point C, in the case of the chip flute 400. The first rake angle α is the angle between the slot surface 410 of the arcuate edge (i.e., the first rake surface) and the base surface, which is about 5 degrees, and the second rake angle β is the angle between the second rake surface 420 and the base surface, which is about 10 degrees. In the case where no chip flute is provided, the rake angle at the selected point a on the arcuate cutting edge 140 is negative by the angle between the head rake surface 120 and the base surface.

The first rake angle of the arcuate cutting edge varies, increasing from about 3 degrees closest to the central axis of the milling cutter to about 15 degrees furthest from the central axis of the milling cutter, the farther it is from the central axis of the milling cutter. Through the first rake angle of change for the cutting resistance distribution of whole blade is more even when cutting by ball nose milling cutter, avoids cutting stress concentration or too big, and the performance is more outstanding when cutting curved surface and complex shape's work piece.

The chip flutes extend to the flute surfaces of the insert body chip flutes 210, and the width of the chip flutes gradually increases in a direction away from the central axis of the milling cutter, so that chip removal is smoother, and the chip and coolant receiving space can be further increased. The chip groove is provided with a groove surface opposite to the groove surface 410 of the arc-shaped cutting edge, namely, the groove surface 440 far away from the arc-shaped cutting edge, and the groove surface 440 far away from the arc-shaped cutting edge is wavy and undulates, so that the chip groove is provided with a groove surface extending in a wavy manner, chips are discharged more smoothly, and friction between the chips, a cutter and the surface of a workpiece is further reduced.

Example 4

The first rake angle of the arc-shaped cutting edge does not change obviously along with the distance between the arc-shaped cutting edge and the central axis of the milling cutter, and the first rake angles at different points of the arc-shaped cutting edge are basically consistent. The chip groove is not provided with a groove surface extending in a wave shape, and each surface of the chip groove extends smoothly without wave-shaped fluctuation.

Example 5

As shown in fig. 10, the present embodiment discloses an integral cemented carbide milling cutter with arc-shaped chip flutes, which is a bull nose milling cutter, comprising a cutter body 200, a cutter head 100, and a cutter shank 300, the cutter body having a diameter of 10mm, the cutter body being provided with four cutter body chip flutes 210 extending helically along the axial direction of the cutter body, the helical angle of which is 25 °.

The cutter head is correspondingly provided with four cutter head chip flutes 110 connected with the cutter body chip flutes, the surface of the cutter head chip flute facing the cutting rotation direction is a cutter head front cutter face 120, the cutter head front cutter face is intersected with the outer peripheral surface 130 of the cutter head to form a cutter head cutting edge for cutting, and the cutter head cutting edge comprises an arc-shaped section, namely an arc-shaped cutting edge 140.

Fig. 11 shows a partial schematic view of the arcuate cutting edge of a cutting head, the cutting head 100 having a bottom surface 150 remote from the blade body, the arcuate cutting edge 140 extending to the bottom surface to form a bottom edge 151, the bottom surface being void-free in the region where the cutting edge is not located. The tool bit rake face is provided with a chip flute 400 extending along the arc-shaped cutting edge, the chip flute forms a flute face 410 of the arc-shaped cutting edge and is a first rake face, the first rake face forms a first rake at each position of the arc-shaped cutting edge, the chip flute is provided with a second rake face 420 connected with the first rake face, a second rake is formed, and the second rake is larger than the corresponding first rake.

The first rake angle of the arc-shaped cutting edge is changed to be smaller as the first rake angle is farther from the central axis of the milling cutter, the first rake angle of the arc-shaped cutting edge is 10 degrees at the position closest to the central axis of the milling cutter, the first rake angle is 5 degrees at the position farthest from the central axis of the milling cutter, and the second rake angle is about 5 degrees compared with the corresponding first rake angle.

Fig. 12 is a schematic view of cutting of a nose milling cutter, and fig. (b) is a partial schematic view of an R angle in fig. (a), which shows that a cutting point a and a cutting point b are closer to a central axis of the milling cutter than the cutting point b, but the nose milling cutter mainly cuts a side wall or a bottom edge, the edge line speed of the R angle of the cutting part is not significantly affected by the distance from the central axis like a ball end milling cutter, the strength of the edge at a cutter point needs to be ensured in high-speed processing, the cutting point b has a larger cutting thickness, the cutting point a has a smaller cutting thickness, and the cutting point a is thinner near the bottom edge and needs a larger first rake angle, so that the first rake angle is smaller as the distance between the edge and the central axis of the milling cutter is farther, and the strength of the whole R edge is ensured.

The groove surface of the arc-shaped cutting edge forms a first front angle, so that the sharpness of the cutting edge is improved along the extending direction of the arc-shaped cutting edge, the cutting resistance is reduced, the cutting is lighter and faster, the sharpness is improved along the extending direction of the arc-shaped cutting edge, the cutting force is more uniformly guided to be dispersed at different parts of the cutter head, the chip groove increases the chip containing space and acts as a chip removing channel in the cutting process, and chips are smoothly discharged in time. The deeper chip groove can be arranged on the premise of ensuring the strength of the cutting edge through the arrangement of the second rake angle, so that larger chip containing and chip removing space is obtained, the risk of chip accumulation in the cutting process is reduced, the abrasion of the cutter is obviously reduced, the service life of the cutter is greatly prolonged, the cutting speed and the processing efficiency are obviously improved, and the stable and efficient cutting process is ensured.

The milling cutter provided by the embodiment of the application is prepared by the following method:

And (3) obtaining a required milling cutter blank from the market, forming a milling cutter semi-finished product through finish machining and grinding, then setting the chip groove on the milling cutter by adopting a femtosecond pulse laser machining method, and finally performing PVD (physical vapor deposition) coating treatment to form the milling cutter finished product. Wherein the step of finish grinding to form a milling cutter semi-finished product is accomplished by a grinding machine. The PVD coating process is prepared using prior art methods. The chip flutes were set up in a femtosecond pulse laser machining method using a precision numerical control laser commercially available from the trade company of De Ma Jisen precision machine tool, inc. under the trade name LASERTEC Shape.

Cutting test 1

The metal cutting test was performed using the solid carbide milling cutter of examples 1 and 2 of the present application, the machining material was nickel-based alloy, and the solid carbide milling cutter without chip flutes was used as a control, and cooling was performed using a coolant.

Cutting a workpiece: turbine blade

The material of the workpiece: nickel base alloy GH4080A-T6, hardness HRC30

Machine equipment: DMG80 five-axis

The cutting mode is as follows: five-axis milling

The processing procedure comprises the following steps: finish milling

The processing test results are shown in table 1 below:

TABLE 1

Cutting test 2

The solid carbide milling cutters of the embodiments 1 and 2 of the present application were used for metal cutting test, the machining material was stainless steel, and the solid carbide milling cutter without chip grooves was used as a control, and cooling was performed with a coolant.

Cutting a workpiece: turbine blade

The material of the workpiece: stainless steel X20CR13-5, hardness HRC30

Machine equipment: DMG80 five-axis

The cutting mode is as follows: five-axis milling

The processing procedure comprises the following steps: finish milling

The processing test results are shown in table 2 below:

TABLE 2

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Cutting test 3

The solid cemented carbide milling cutters of the embodiments 3 and 4 of the present application were used for metal cutting tests, the machining material was nickel-based, and the solid cemented carbide milling cutter without chip flutes was used as a control, and cooling was performed with a coolant.

Cutting a workpiece: turbine blade

The material of the workpiece: nickel base alloy GH4080A-T6, hardness HRC30

Machine equipment: DMG80 five-axis

The cutting mode is as follows: five-axis milling

The processing procedure comprises the following steps: rough milling

The processing test results are shown in table 3 below:

TABLE 3 Table 3

Cutting test 4

The metal cutting test was performed using the solid carbide milling cutter of example 5 of the present application, the machining material was a nickel-based alloy, and the solid carbide milling cutter without chip flutes was used as a control, and cooling was performed using a coolant.

Cutting a workpiece: turbine blade

The material of the workpiece: nickel base alloy GH4080A-T6, hardness HRC30

Machine equipment: DMG80 five-axis

The cutting mode is as follows: five-axis milling

The processing procedure comprises the following steps: rough machining

The processing test results are shown in table 4 below:

TABLE 4 Table 4

According to the chip machining test result, the machining life and the machining efficiency of the cutter can be improved at the same time, on one hand, the cutting resistance is reduced by improving the sharpness of the cutting edge along the extending direction of the arc-shaped cutting edge, cutting is enabled to be lighter and faster, cutting heat is reduced, the phenomenon of cutting stress concentration possibly occurring in the cutting process is reduced, the arc-shaped cutting edge cannot be worn or broken due to local stress concentration, on the other hand, the chip containing space and the chip removing space are increased in the cutting process through the arrangement of the chip groove, chips generated in the cutting process can be discharged in time smoothly, the accumulation of cutting heat is reduced, and meanwhile friction between the chips and the cutter is reduced. The workpiece with complex shape has more excellent performance, the abrasion of the cutter is obviously reduced, the service life of the cutter is greatly prolonged, the cutting speed and the processing efficiency are obviously improved, and the stable and efficient cutting process is ensured. Under the condition that the machining efficiency is improved by 1.2 to 1.5 times, the service life of the cutter is improved by 2 to 5 times, and even by more than 8 times.

The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the disclosure, which is defined by the appended claims.

Claims

1. A solid carbide milling cutter with arc-shaped chip flutes comprises a cutter body, a cutter head and an optional cutter handle for direct or indirect connection with a machine tool,

The cutter body is provided with a plurality of cutter body chip flutes,

The chip flute has a second rake surface connected to the first rake surface forming a second rake angle, the second rake angle being greater than the corresponding first rake angle.

2. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the cutter head is a ball nose, the arcuate cutting edge is rounded and extends on the ball nose to less than 1/2R from the mill central axis, the first rake angle of the arcuate cutting edge being varied the farther from the mill central axis.

3. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the cutter head has a bottom surface remote from the body, the arcuate cutting edges extending to the bottom surface, and wherein the clearance treatment is performed in areas of the bottom surface where the arcuate cutting edges are not provided.

4. A solid carbide milling cutter with curved chip flutes according to claim 3, characterized in that the first rake angle of the curved cutting edge is varied, which decreases the further from the centre axis of the milling cutter.

5. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the first rake angle is 2 to 20 degrees, such as 5 to 15 degrees, and the second rake angle is 7 to 25 degrees, such as 10 to 20 degrees.

6. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the second rake angle is 2 to 20 degrees greater than the corresponding first rake angle.

7. The solid carbide milling cutter with arcuate chip flutes according to claim 1, wherein the width of the first rake face is 30-75%, such as 40-70%, such as 50-60% of the feed per tooth.

8. The solid carbide milling cutter with arcuate chip flutes according to claim 1, wherein the chip flutes extend to flute faces of the insert body chip flutes.

9. The solid carbide milling cutter with arcuate chip flutes according to claim 1 or 2, wherein the chip flutes increase in width progressively in a direction away from the central axis of the milling cutter.

10. The solid carbide milling cutter with arcuate chip flutes according to claim 1, wherein the insert flutes extend helically in the axial direction of the insert body at a helix angle of between 3 and 45 degrees, such as 10 to 30 degrees, such as 15 to 25 degrees.

11. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the chip flutes further have third rake surfaces connected to the second rake surfaces forming third rake angles, the third rake angles being greater than the corresponding second rake angles.

12. The solid carbide mill with arcuate chip flutes according to claim 11, wherein the third rake angle is 10 to 30 degrees, such as 15 to 25 degrees.

13. The solid carbide mill with arcuate chip flutes according to claim 1, wherein the chip flutes have wavy-extending flute surfaces.

14. A method of manufacturing a solid carbide milling cutter according to any of the claims 1 to 13, characterized in that the chip flutes are manufactured by a machining method which does not cause thermal damage.

15. The method of claim 14, wherein the chip flutes are prepared using a femtosecond pulse laser machining method.