Solid carbide milling cutter with arc-shaped chip grooves

Abstract

The solid carbide milling cutter comprises a cutter body and a cutter head, the cutting grooves extending along an arc-shaped cutting edge are formed in the front cutter face of the cutter head, the cutting grooves form the groove face of the arc-shaped cutting edge and are first front angle faces, the first front angle faces form first front angles at all positions of the arc-shaped cutting edge, and the first front angle faces form second front angles at all positions of the arc-shaped cutting edge. The chip groove is provided with a second front angle face connected with the first front angle face, a second front angle is formed, and the second front angle is larger than the corresponding first front angle. By adding the chip grooves in the front cutter face of the arc-shaped cutting edge, the sharpness of the cutting edge can be remarkably improved, the phenomenon of cutting stress concentration possibly occurring in the cutting process can be effectively reduced, meanwhile, chips generated in the cutting process can be smoothly discharged in time, the cutting quality can be improved, and the smoothness and precision of the surface of a workpiece can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, in particular to an integral carbide milling cutter with an arc-shaped chip groove. Background Art

[0002] Milling cutters are usually used for high-speed cutting. The milling speed is high and there is no idle travel. It is an efficient cutting method, but the impact and vibration are large during processing. The design of different cutting edge shapes of milling cutters helps to guide the cutting edge for precise cutting more easily during the cutting process. For example, a ball-end milling cutter with an arc cutting edge is a common type of milling cutter, which is suitable for processing workpieces of various shapes and contours, including parts with curved and complex contours. Its spherical cutting edge design allows cutting in different directions, improves the flexibility of processing, is suitable for multi-axis processing, can more flexibly process different surfaces of the workpiece, and provides higher processing efficiency and better processing quality. For tools such as ball-end milling cutters and bull nose milling cutters that contain arc cutting edges, the curvature and cutting angle at different points of the cutting edge are different, which affects the sharpness of the cutting edge and the smooth discharge of chips, reduces the surface quality of the workpiece, and the force condition of the arc cutting edge is more complicated. The cutting edge is prone to chipping due to excessive local force, which greatly limits the cutting efficiency and tool life. 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. Especially 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. Summary of the invention

[0003] The present invention provides a solid carbide milling cutter with an arc-shaped chip groove, which includes the following embodiments:

[0004] Embodiment 1: A solid carbide milling cutter with an arc-shaped chip groove, comprising a cutter body, a cutter head, and an optional cutter handle for direct or indirect connection with a machine tool.

[0005] The blade body is provided with a plurality of blade body chip grooves.

[0006] The cutter head is provided with a plurality of cutter head chip grooves connected to the cutter body chip grooves,

[0007] The surface of the cutter head chip groove facing the cutting rotation direction is the cutter head rake face.

[0008] The front cutting surface of the cutter head intersects with the outer peripheral surface of the cutter head to form a cutter head edge for cutting, and the cutter head edge includes an arc segment, that is, an arc edge, characterized in that:

[0009] The front cutting surface of the cutter head is provided with a chip groove extending along the arc-shaped cutting edge.

[0010] The groove surface of the chip groove forming the arc-shaped cutting edge is a first rake angle surface, and the first rake angle surface forms a first rake angle at each location of the arc-shaped cutting edge.

[0011] The chip flute has a second rake face connected to the first rake face to form a second rake angle, and the second rake angle is greater than the corresponding first rake angle. In some embodiments, the diameter of the solid carbide milling cutter with the arc-shaped chip flute is 1 mm to 50 mm.

[0012] Embodiment 2: The integral carbide milling cutter with an arc-shaped chip groove according to embodiment 1 is characterized in that the cutter head is a ball head, the arc-shaped cutting edge is an arc and extends on the ball head to a distance less than 1 / 2R from the center axis of the milling cutter, and the first rake angle of the arc-shaped cutting edge is variable, and its distance from the center axis of the milling cutter increases.

[0013] Embodiment 3, according to embodiment 1, the integral carbide milling cutter with arc-shaped chip groove is characterized in that the cutter head has a bottom surface away from the blade body, the arc-shaped cutting edge extends to the bottom surface, and a clearance treatment is performed in the area of ​​the bottom surface where the arc-shaped cutting edge is not provided.

[0014] Embodiment 4: The solid carbide milling cutter with an arc-shaped chip groove according to embodiment 3 is characterized in that the first rake angle of the arc-shaped cutting edge is variable and becomes smaller as it is farther from the center axis of the milling cutter.

[0015] Embodiment 5, the solid carbide milling cutter with arc-shaped chip groove according to embodiment 1 is characterized in that the first rake angle is 2 degrees to 20 degrees, for example, 5 degrees to 15 degrees, and the second rake angle is 7 degrees to 25 degrees, for example, 10 degrees to 20 degrees.

[0016] Embodiment 6: The solid carbide milling cutter with an arc-shaped chip groove according to embodiment 1 is characterized in that the second rake angle is 2 degrees to 20 degrees larger than the corresponding first rake angle.

[0017] Embodiment 7: The solid carbide milling cutter with an arc-shaped chip groove according to embodiment 1 is characterized in that the width of the first front angle surface is 30%-75%, such as 40%-70%, such as 50%-60% of the feed per tooth.

[0018] Embodiment 8: The solid carbide milling cutter with an arc-shaped chip groove according to embodiment 1 is characterized in that the chip groove extends to the groove surface of the chip groove of the blade body.

[0019] Embodiment 9: A solid carbide milling cutter with an arc-shaped chip groove according to embodiment 1 or 2, characterized in that the width of the chip groove gradually increases in a direction away from the center axis of the milling cutter.

[0020] Embodiment 10, the integral carbide milling cutter with arc-shaped chip groove according to embodiment 1 is characterized in that the chip groove of the blade body extends spirally along the axial direction of the blade body, and its spiral angle is between 3 and 45 degrees, such as 10 to 30 degrees, such as 15 to 25 degrees.

[0021] Embodiment 11, according to embodiment 1, the integral carbide milling cutter with an arc-shaped chip groove is characterized in that the chip groove also has a third rake angle surface connected to the second rake angle surface to form a third rake angle, and the third rake angle is larger than the corresponding second rake angle.

[0022] Embodiment 12: A solid carbide milling cutter with an arc-shaped chip groove according to embodiment 11, characterized in that the third rake angle is 10 degrees to 30 degrees, for example, 15 degrees to 25 degrees.

[0023] Embodiment 13: A solid carbide milling cutter with an arc-shaped chip groove according to embodiment 1, characterized in that the chip groove has a groove surface extending in a wavy shape.

[0024] Embodiment 14: The solid carbide milling cutter with arc-shaped chip grooves according to embodiment 1 is characterized in that the cutter head is provided with 4 to 12 cutter head cutting edges.

[0025] Embodiment 15: A method for preparing the integral carbide milling cutter described in any one of embodiments 1 to 14, characterized in that the chip groove is prepared by a processing method that does not cause thermal damage.

[0026] Embodiment 16: The method according to embodiment 15 is characterized in that the chip groove is prepared by a femtosecond pulse laser processing method.

[0027] The technical solution of this application has the following beneficial technical effects:

[0028] 1. Improve sharpness and reduce cutting resistance. The present invention provides a chip groove extending along the arc-shaped cutting edge, and forms a first rake angle through the groove surface of the arc-shaped cutting edge, thereby improving the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reducing cutting resistance, and making cutting easier.

[0029] 2. Avoid stress concentration on the cutting edge and avoid hardening of the material. Improving the sharpness along the extension direction of the arc-shaped cutting edge helps to more evenly guide the cutting force to be dispersed in different parts of the cutter head, reduce the risk of force concentration on the tool at a specific point, achieve the dispersion of cutting stress, reduce the cutting stress concentration phenomenon on the arc-shaped cutting edge during the cutting process, reduce the risk of tool wear, and avoid hardening of the material.

[0030] 3. Achieve smooth chip removal, reduce tool wear, and reduce cutting heat generation. The chip groove increases the chip capacity and acts as a chip removal channel during the cutting process, which helps to smoothly and timely discharge the chips. By setting the second rake angle, a deeper chip groove can be set while ensuring the strength of the cutting edge, obtaining a larger chip capacity and chip removal space, reducing the risk of chip accumulation during the cutting process, effectively preventing chip accumulation and chip jamming, further reducing tool wear and suppressing the heat generated during the cutting process.

[0031] 4. Increase the number of teeth and improve processing efficiency. By setting the chip groove, the tool edge can obtain maximum sharpness through the chip groove, so that more cutting teeth can be set on the cutter head, thereby improving processing efficiency.

[0032] Through the improvements of this application, ball-end milling cutters, bullnose milling cutters and other tools with curved cutting edges perform better when processing curved surfaces and complex-shaped workpieces, tool wear is significantly reduced, the service life of the tool is greatly extended, and the cutting speed and processing efficiency are significantly improved, ensuring a stable and efficient cutting process. The introduction of chip grooves effectively improves the stability of the cutting edge, which not only improves the cutting efficiency, but also helps to improve the cutting quality and ensure the finish and precision of the workpiece surface. This improvement provides a more reliable tool for precision machining and high-quality cutting of the workpiece surface, especially solving the industry problem of difficult machining of high-temperature alloy materials. While the machining efficiency is increased by 1.2 to 1.5 times, the tool life is also increased by 2 to 5 times, or even more than 8 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 in the following description only relate to some embodiments of the present disclosure, but are not limitations of the present disclosure.

[0034] Figure 1 The overall structure diagram of the ball end mill in Example 1;

[0035] Figure 2 It is a partial schematic diagram of the cutter head;

[0036] Figure 3 It is an enlarged schematic diagram of the arc-shaped cutting edge for setting the chip groove;

[0037] Figure 4 for Figure 3AA section view of the selected point of the mid-arc cutting edge;

[0038] Figure 5 It is a schematic diagram of cutting with a curved cutting edge of a ball end mill;

[0039] Figure 6 A cross-sectional view of a selected point of the arc-shaped cutting edge in Example 2;

[0040] Figure 7 The overall structure diagram of the ball end mill in Example 3;

[0041] Figure 8 It is an enlarged schematic diagram of the arc-shaped cutting edge for setting the chip groove;

[0042] Fig. 9 for Figure 8 CC section view of the selected point of the middle arc cutting edge;

[0043] Fig.10 This is the overall structural diagram of the nose milling cutter of Example 5;

[0044] Fig.11 It is an enlarged schematic diagram of the arc-shaped cutting edge for setting the chip groove;

[0045] Fig.12 This is a schematic diagram of the cutting of the bull nose milling cutter. Description of the drawings:

[0047] 100-cutter head, 110-cutter head chip groove, 120-cutter head rake face, 130-outer peripheral surface of the cutter head, 140-arc cutting edge, 150-bottom surface, 151-bottom edge,

[0048] 200-blade, 210-blade chip groove,

[0049] 300-Handle,

[0050] 400 - chip groove, 410 - groove surface (first front angle surface) of the arc-shaped cutting edge, 420 - second front angle surface, 430 - third front angle surface, 440 - groove surface away from the arc-shaped cutting edge. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the 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.

[0052] The present application discloses an integral carbide milling cutter with an arc-shaped chip groove, comprising a blade body, a blade head, and an optional shank for direct or indirect connection with a machine tool, the blade body being provided with a plurality of blade body chip grooves, the blade head being provided with a plurality of blade head chip grooves connected to the blade body chip grooves, the surface of the blade head chip groove facing the cutting rotation direction being the blade head rake face, the blade head rake face intersecting with the outer peripheral surface of the blade head to form a blade head cutting edge for cutting, the blade head cutting edge comprising an arc segment, i.e., an arc-shaped cutting edge, characterized in that the blade head rake face is provided with a chip groove extending along the arc-shaped cutting edge, the groove surface of the chip groove forming the arc-shaped cutting edge is a first rake angle surface, the first rake angle surface forms a first rake angle at each location of the arc-shaped cutting edge, the chip groove has a second rake angle surface connected to the first rake angle surface to form a second rake angle, and the second rake angle is greater than the corresponding first rake angle. The solid carbide milling cutter with arc-shaped chip grooves of the present application is a rotary processing tool, and its diameter is not limited. Those skilled in the art can select it according to actual needs, and can usually choose 0.8mm to 80mm, such as 1mm to 50mm, such as 5mm to 40mm, 6mm to 25mm. The diameter described in the present application refers to the diameter of the cylindrical outer surface formed when the cutter head is rotated for processing.

[0053] The present application forms a first rake angle through the groove surface of the arc-shaped cutting edge by setting a chip groove extending along the arc-shaped cutting edge, thereby improving the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reducing cutting resistance, making cutting easier, reducing cutting heat generation, and effectively reducing the cutting stress concentration phenomenon that may occur during the cutting process. The introduction of the chip groove helps to guide the cutting force more evenly, effectively disperse it in different parts of the cutter head, reduce the risk of force concentration on the tool at a specific point, achieve the dispersion of cutting stress, effectively improve the stability of the cutting edge, and reduce the risk of tool wear. This design improvement can not only improve cutting efficiency, but also help improve cutting quality and ensure the finish and precision of the workpiece surface. Those skilled in the art can set the chip groove as needed to obtain the required cutting edge sharpness.

[0054] The tip of cutting tools such as ball end mills and bull nose mills has a curved or arc shape. When the cutting force acts on this changing curvature, it is easy to cause uneven stress distribution. If the cutting stress is uneven or too large, it will cause scratches, cracks or other defects on the cutting surface, reduce the surface quality of the workpiece, and aggravate the local wear of the tool, limiting the life of the tool. High-intensity cutting stress will not only cause the tool to break, but also cause plastic deformation of the material or hardening of the material surface, and even cause residual stress, causing deformation or cracking of the material during subsequent processing or use.

[0055] The design of the chip groove of the present application can overcome the problem of stress concentration on the arc-shaped cutting edge, avoid hardening of the material surface, reduce the occurrence of edge chipping, and increase the processing life of the milling cutter.

[0056] During the milling process, chip evacuation has an important influence on cutting quality, tool life and machining efficiency. Ball end mills are usually designed to discharge chips in a spiral form. By designing the geometry of the blade and cutter body, the chips formed during the cutting process are quickly discharged along the spiral path. The tip of the ball end mill is spherical, which results in a large curvature of the cutting edge. Since the chip flow path on the spherical tip is relatively complex, the chips may encounter greater resistance during the flow process, increasing the difficulty of discharge. If the cutting angle at the tip is large, the chips may be more likely to get stuck at the tip, causing the chips to generate excessive heat at the tip, causing them to adhere to the tip, greatly reducing the machining quality and tool life.

[0057] The chip groove design of the present application can not only improve the sharpness of the cutting edge, but also guide the flow of chips and reduce the interference of chips on the tool and workpiece. On the other hand, the design of the chip groove also increases the chip capacity. The existence of the chip groove acts as a chip removal channel during the cutting process, which helps to smoothly discharge the chips generated during the cutting process in a timely manner, reduces the risk of chip accumulation during the cutting process, and allows the chips to be discharged in a timely and smooth manner, effectively preventing the accumulation and jamming of chips.

[0058] The present application further sets a second rake angle that is larger than the corresponding first rake angle, so that while ensuring the strength and collapse resistance of the cutting edge, a deeper chip groove can be set through the larger second rake angle, thereby increasing the chip capacity and chip removal space, further reducing tool wear, and increasing tool service life.

[0059] The terms in this application have the meanings commonly understood by those skilled in the art. For metal cutting tools, the angle between the rake face and the base surface is the rake angle. The "first rake angle" in this application refers to the angle between the groove surface (i.e., the first rake angle surface) of the arc-shaped cutting edge and the base surface in the measurement plane of the rake angle. The "second rake angle" in this application refers to the angle between the second rake angle surface and the base surface in the measurement plane of the rake angle.

[0060] For a selected point on a cutting edge without a chip groove, it has a rake angle formed by the rake face. For a selected point on a cutting edge with a chip groove, it has a first rake angle and a second rake angle formed by the groove face (i.e., the first rake face) and the second rake face of the arc-shaped cutting edge, respectively, and the first rake angle is the corresponding first rake angle of the second rake angle.

[0061] 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 high-hardness refractory metal carbide (WC, TiC) 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 800-1000°C, and the allowed cutting speed is about 4-10 times that of high-speed steel. The hardness is very high, reaching (89-91)HRA, and some are as high as 93HRA; but its bending strength is 1.1-1.5GPa, which is only half of that of high-speed steel; the impact toughness is 0.04MJ / m 2 About, less than 1 / 25-1 / 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 the present application includes one selected from the following: for example, tungsten-cobalt (WC-Co) cemented carbide, tungsten-titanium-cobalt (WC-T i-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 carbide, or TiC-based cemented carbide, ultrafine grain cemented carbide, steel-bonded cemented carbide, coated cemented carbide, etc.

[0062] The high-temperature alloy described in this application is also called heat-resistant alloy. In the prior art, the reasons why high-temperature alloy materials are difficult to cut are as follows: 1. High temperature strength and high tendency to work hardening. During cutting, the plastic deformation resistance is large, the cutting load is heavy, and the cutting temperature is high. The unit cutting force of general nickel-based high-temperature alloys is 50% higher than that of medium carbon steel; the work hardening and residual stress of the surface layer after processing are large, and the degree of hardening can reach 200%-500%; the wear of the tip and the edge is extremely serious, and the groove wear of the secondary back face is also very easy to occur. 2. Poor thermal conductivity. The thermal conductivity coefficient is about 1 / 5-1 / 2 of 45 steel, so the cutting temperature is high. Studies have shown that when processing heat-resistant alloys, about 40% of the heat accumulates in the tool edge area, about 40% of the heat accumulates on the chips, and about 20% accumulates on the cutting material, which easily causes the material to harden. 3. The tendency to bond with the tool is large. It is very easy to produce built-up edge, affecting the quality of the processed surface. 4. High content of strengthening elements. A large number of highly abrasive metal carbides, intermetallic compounds and other hard points are formed in the alloy, which have a strong abrasive effect on the tool. The wear of the tool surface and the workpiece or cutting surface greatly affects the tool life, processing efficiency and processing accuracy. For example, the "cold welding" phenomenon produced by the tool and the workpiece material under sufficiently large pressure and high temperature is the result of adsorption between the fresh surface atoms of the friction surface. The bonding points of the two friction surfaces will be torn and taken away by the other side due to relative movement. If the rupture of the bonding points occurs on the tool side, it causes tool wear. Cutting temperature is the main factor affecting bonding wear. The higher the cutting temperature, the more severe the bonding wear.

[0063] The technical solution of this application can improve the sharpness of the cutting edge, reduce the cutting force, and enhance the wear resistance of the cutting edge. The existence of the chip groove increases the chip space and acts as a chip removal channel during the cutting process, which helps to smoothly discharge the chips generated during the cutting process in a timely manner, improve the cutting performance from multiple aspects, improve the processing efficiency, and improve the surface quality of the product. It provides a reliable solution for the processing of high-temperature alloy materials.

[0064] In some embodiments, the cutter head is a ball head, the arc-shaped cutting edge is arc-shaped and extends on the ball head to a distance less than 1 / 2R from the center axis of the milling cutter, and the first rake angle of the arc-shaped cutting edge is variable, and increases as it is farther from the center axis of the milling cutter, wherein R is the radius of the arc-shaped cutting edge or the radius of the ball head.

[0065] For a ball-end milling cutter, the center axis is used as the rotation axis during cutting. The closer the cutting edge is to the center axis, the slower the linear speed of the cutting edge is. A smaller rake angle is required to obtain a higher edge strength to improve the edge's resistance to collapse. On the contrary, the farther away from the center axis of the milling cutter, the faster the linear speed of the cutting edge is, the greater the cutting speed is, and the greater the cutting thickness is. The increase in cutting thickness leads to greater cutting force and higher cutting temperature. Therefore, it is necessary to increase the rake angle to improve the sharpness of the cutting edge. The larger the first rake angle is, the sharper the cutting edge is, and the smaller the cutting resistance is. The first rake angle is larger as the cutting edge is farther from the center axis of the milling cutter, so that when the ball-end milling cutter is cutting, the cutting resistance of the entire cutting edge is more evenly distributed, avoiding concentrated or excessive cutting stress, and performing better when cutting curved surfaces and complex-shaped workpieces, ensuring a stable and efficient cutting process, and providing a more reliable tool for precision machining and high-quality cutting of the workpiece surface. Such adjustments can ensure that the cutting edge can maintain ideal cutting performance at different positions while extending the service life of the tool.

[0066] In some embodiments, the blade head has a bottom surface away from the blade body, the arc-shaped cutting edge extends to the bottom surface, and a clearance treatment is performed in an area of ​​the bottom surface where the arc-shaped cutting edge is not provided.

[0067] For the bull nose milling cutter, the outer peripheral surface of the cutter head includes a bottom surface and a transition surface connecting the outer peripheral surface of the blade body and the bottom surface. The bottom surface and the transition surface of the cutter head intersect with the front cutting edge of the cutter head to form a bottom edge and an R angle (also called an R edge). The bottom surface close to the center axis does not directly participate in the cutting. Therefore, a clearance treatment is performed in the area of ​​the bottom surface where the arc-shaped cutting edge is not set.

[0068] In some embodiments, the first rake angle of the arc-shaped cutting edge is variable, and the farther it is from the center axis of the milling cutter, the smaller it is. Unlike a ball-end milling cutter, a bullnose milling cutter mainly cuts the sidewall or the bottom edge, and in high-speed processing, it is necessary to ensure the strength of the cutting edge at the tip of the cutter. The linear velocity of the cutting edge at the R angle of the cutting part is not significantly affected by the distance from the center axis like a ball-end milling cutter. The closer to the bottom edge, the thinner the cutting, and the larger the first rake angle is required. Therefore, the first rake angle is smaller as the cutting edge is farther from the center axis of the milling cutter, ensuring the strength of the R edge.

[0069] In some embodiments, the first rake angle is 2 to 20 degrees, for example, 5 to 15 degrees, and the second rake angle is 7 to 25 degrees, for example, 10 to 20 degrees. The present application sets the first rake angle to improve the sharpness of the arc-shaped cutting edge, but too high sharpness will reduce the strength and collapse resistance of the cutting edge, so the first rake angle should not be too large. By setting a second rake angle greater than the corresponding first rake angle, the sharpness and collapse resistance of the cutting edge can be significantly increased while the depth of the chip groove is significantly increased. The deeper chip groove can increase the chip capacity and chip removal space, which is convenient for smooth chip removal and heat dissipation, and at the same time can increase the capacity of the coolant and further improve the cooling effect. Those skilled in the art can set the first rake angle as needed to achieve the effect of a sharp cutting edge, and set the second rake angle to achieve a better chip removal effect. The range setting of the first rake angle and the second rake angle of the present application can obtain better cutting performance of the tool.

[0070] In some embodiments, the second rake angle is 2 to 20 degrees greater than the corresponding first rake angle, such as 7 to 15 degrees.

[0071] 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 a direction perpendicular to the extension direction of the arc-shaped cutting edge.

[0072] In some embodiments, the chip groove extends to the groove surface of the chip groove of the blade body, so that the chips in the chip groove can flow directly into the chip groove of the blade body, thereby improving the chip removal effect and further increasing the carrying space for chips and coolant.

[0073] In some embodiments, the width of the chip groove gradually increases in the direction away from the center axis of the milling cutter. The width of the chip groove refers to the dimension of the chip groove on the rake face of the cutter head perpendicular to the extending direction of the cutting edge. The larger the width of the chip groove, the larger the chip holding space, and the larger the space for the chips to flow through. Increasing the width of the chip groove in the direction away from the center axis of the milling cutter can achieve smoother chip removal.

[0074] In some embodiments, the blade chip groove extends spirally along the blade axis, and its spiral angle is 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 angle between the spiral direction and the center axis of the milling cutter.

[0075] In some embodiments, the chip groove also has a third rake angle surface connected to the second rake angle surface to form a third rake angle, and the third rake angle is greater than the corresponding second rake angle. The term "third rake angle" in this 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, the first rake angle, the second rake angle and the third rake angle exist at the same time, and the second rake angle is the corresponding second rake angle of the third rake angle of the selected point on the cutting edge. By providing a chip groove with the third rake angle, the chip space can be further increased and the chip flow direction can be guided, the cutting resistance can be reduced, the cutting temperature can be lowered, the friction between the chips and the front cutting edge and the workpiece can be suppressed, the chip removal efficiency can be improved, and the tool life can be further improved.

[0076] In some embodiments, the third rake angle is 10 degrees to 30 degrees, for example, 15 degrees to 25 degrees.

[0077] In some embodiments, the chip groove has a groove surface extending in a wave shape. For example, the first rake face, the second rake face or the second rake face has undulations extending in a wave shape, for example, the chip groove has a groove bottom surface, and the groove bottom surface is undulating in a wave shape, for example, the chip groove has a groove surface opposite to the groove surface of the arc-shaped cutting edge, that is, a groove surface away from the arc-shaped cutting edge, and the groove surface away from the arc-shaped cutting edge is undulating in a wave shape. The wavy extending groove surface can further reduce the friction between the chips and the tool and the workpiece surface.

[0078] In some embodiments, the cutter head is provided with 2 to 12 cutter head edges. For example, the cutter head is provided with 2 cutter head edges, or the cutter head is provided with 4 cutter head edges, or the cutter head is provided with 6 cutter head edges, or the cutter head is provided with 8 cutter head edges, or the cutter head is provided with 10 cutter head edges, or the cutter head is provided with 12 cutter head edges. In the prior art, the cutter head edge obtains the edge sharpness through the grinding angle of the cutter head rake face, and cannot be set according to the required sharpness value, and also limits the number of cutter head edges. However, the present application provides a chip groove, and the tool edge can obtain a large sharpness through the chip groove, so that more cutting teeth can be set on the cutter head, thereby improving the processing efficiency.

[0079] The preparation method of the milling cutter in the prior art is known to those skilled in the art, and comprises 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, grinding the cemented carbide rod to form a blank of the milling cutter; 3. forming a semi-finished product of the milling cutter by fine grinding; 4. subjecting the semi-finished product to PVD coating treatment to form a finished product of the milling cutter.

[0080] The present application also discloses a method for preparing the integral carbide milling cutter, characterized in that the chip groove is prepared by a processing method that does not cause thermal damage.

[0081] A method for preparing a milling cutter in the present application mainly involves machining a 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.

[0082] In some embodiments, the chip groove is prepared by femtosecond pulse laser processing.

[0083] The 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 at the chip groove, damaging the tool, and the surface finish is very poor. Not only can it not meet the requirements of fine processing, but the tool life is sharply reduced. Without being limited by theory, it is believed that the reason for the generation of this 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 the tool 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. However, the use of femtosecond pulse laser processing will not cause thermal damage due to its extremely fast speed.

[0084] Femtosecond pulse laser processing can also improve or strengthen the performance of cemented carbide. Through femtosecond pulse laser processing, specific textures or microstructures can be produced on the surface of cemented carbide to achieve surface nano-crystalization. The high precision and control ability of femtosecond pulse laser can be used to manufacture complex nano-scale structures on the surface of cemented carbide. It can also be used to introduce beneficial residual stresses in cemented carbide materials, repair micro-cracks or damage in cemented carbide tools, and restore its surface integrity through local melting and re-solidification to improve its surface performance, giving the material special properties, such as increasing hardness, increasing its wear resistance, and improving the fatigue life of the material. The surface processed by femtosecond pulse laser can reach a smoothness of 0.1-0.2nm, and can even be mirror-like, which is suitable for fine processing.

[0085] By setting the chip groove, the sharpness of the tool edge is significantly improved, greatly reducing the cutting resistance. The chip groove can also increase the chip holding space and improve the chip removal efficiency. The friction and extrusion pressure between the chips and the workpiece are reduced, thereby significantly improving the smoothness of the product surface and achieving high-precision, high-flexibility and high-efficiency processing.

[0086] The above ranges can be used alone or in combination. The present application can be more easily understood through the following examples.

[0087] Example

[0088] Example 1

[0089] like Figure 1 As shown, this embodiment discloses a solid carbide milling cutter with an arc-shaped chip groove, comprising a blade body 200, a cutter head 100, and a tool handle 300 for connecting to a machine tool, wherein the blade body 200 has a taper. The blade body is provided with four blade body chip grooves 210 extending spirally along the blade body axis, and the spiral angle is 25 degrees. The cutter head is provided with four blade head chip grooves 110 connected to the blade body chip grooves.

[0090] Figure 2 It is a partial schematic diagram of a cutter head 100, which is a ball head with a radius of 5 mm. The surface of the cutter head chip groove 110 facing the cutting rotation direction is the cutter head rake face 120, and the cutter head rake face 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, and the cutter head cutting edge includes an arc segment, that is, an arc cutting edge 140. The arc cutting edge is an arc and extends on the ball head to a distance less than 1 / 2R from the center axis of the milling cutter. The cutter head rake face is provided with a chip groove 400 extending along the arc cutting edge.

[0091] Figure 3 An arc-shaped cutting edge 140 is shown with a chip groove 400, wherein the groove surface 410 of the arc-shaped cutting edge formed by the chip groove 400 is a first rake angle surface, wherein the first rake angle surface forms a first rake angle at each location of the arc-shaped cutting edge 410, and the chip groove has a second rake angle surface 420 connected to the first rake angle surface 410 to form a second rake angle, wherein the second rake angle is greater than the corresponding first rake angle.

[0092] Figure 4 Shows Figure 3 AA cross-sectional view at a selected point a on the middle arc-shaped cutting edge 140, Figure 4 The AA section plane is perpendicular to the arc-shaped cutting edge 140 at point a. Figure 4 exemplarily marks the first rake angle α and the second rake angle β at the selected point a on the arc-shaped cutting edge 140 when the chip groove 400 is provided. The first rake angle α is the angle between the groove surface 410 (i.e., the first rake angle surface) of the arc-shaped cutting edge and the base surface, and its magnitude is about 10 degrees. The second rake angle β is the angle between the second rake angle surface 420 and the base surface, and its magnitude is about 20 degrees. Figure 4The virtual line forming the common side of the first rake angle α and the second rake angle β is located on the base surface, which coincides with the connecting line between the selected point a of the cutting edge and the center line of the tool, and can be called the baseline or reference line. In the case where the chip groove is not provided, the rake angle at the selected point a on the arc-shaped cutting edge 140 is the angle between the rake face 120 of the cutter head and the base surface, which is a negative value.

[0093] By setting a chip groove extending along the arc-shaped cutting edge, a first rake angle is formed through the groove surface of the arc-shaped cutting edge, thereby improving the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reducing the cutting resistance, and making the cutting easier. By setting a second rake angle greater than the corresponding first rake angle, a deeper chip groove can be set through a larger second rake angle under the premise of ensuring the strength and collapse resistance of the cutting edge, thereby increasing the chip holding and removal space, further reducing tool wear, and increasing the tool life.

[0094] The first rake angle of the arc-shaped cutting edge is variable, and increases as it is farther from the center axis of the milling cutter, increasing from about 8 degrees closest to the center axis of the milling cutter to about 18 degrees farthest from the center axis of the milling cutter. The second rake angle is approximately 10 degrees greater than the corresponding first rake angle. Figure 5 This is a schematic diagram of the cutting of the arc-shaped cutting edge of a ball-end milling cutter. The figure shows cutting point a and cutting point b. Cutting point a is closer to the center axis of the milling cutter, while cutting point b is farther from the center axis of the milling cutter. During cutting, the ball-end milling cutter uses the center axis as the rotation axis. Therefore, the slower the cutting edge linear speed at cutting point a during cutting, the smaller the rake angle is required to obtain higher cutting edge strength to improve the anti-collapse property of the cutting edge. The cutting edge linear speed at cutting point b is fast and the cutting thickness is also greater, so it is necessary to increase the rake angle to improve the sharpness of the cutting edge to reduce the cutting resistance. By changing the first rake angle, the cutting resistance of the entire cutting edge of the ball-end milling cutter is more evenly distributed during cutting, avoiding concentrated or excessive cutting stress, and performing better when cutting curved surfaces and workpieces with complex shapes.

[0095] The width of the first rake face is about 0.05 mm, which is between 55% and 65% of the feed per tooth of the tool. The chip groove extends to the groove surface of the tool body chip groove 210, so that chip removal is smoother and the chip and coolant carrying space can be further increased.

[0096] like Figure 3 and Figure 4 As shown, the chip groove has a groove surface opposite to the groove surface 410 of the arc-shaped cutting edge, that is, a groove surface 440 away from the arc-shaped cutting edge. The groove surface 440 away from the arc-shaped cutting edge is undulating in a wave-like manner, so that the chip groove has a groove surface extending in a wavy shape, so that the chip discharge is smoother and the friction between the chip and the tool and the workpiece surface is further reduced.

[0097] Example 2

[0098] This embodiment discloses a solid carbide milling cutter with an arc-shaped chip groove, which is basically the same as the embodiment 1, except that:

[0099] The first rake angle of the arc-shaped cutting edge does not change significantly with the distance from the central axis of the milling cutter, and the first rake angles at different points of the arc-shaped cutting edge are substantially the same, about 10 degrees.

[0100] The chip groove does not have a groove surface extending in a wave shape, and each surface thereof extends smoothly without wave-like undulations.

[0101] The chip groove further has a third rake angle surface 430 connected to the second rake angle surface 420 to form a third rake angle, and the third rake angle is greater than the corresponding second rake angle. Figure 6 is a cross-sectional view at a selected point a on the same arc-shaped cutting edge as in Example 1, Figure 6 , the first rake angle α, the second rake angle β and the third rake angle γ at the selected point a on the arc-shaped cutting edge 140 are exemplarily marked in the case where the chip groove 400 is provided. The first rake angle α is the angle between the groove surface 410 (i.e., the first rake angle surface) of the arc-shaped cutting edge and the base surface, and its magnitude is about 10 degrees, the second rake angle β is the angle between the second rake angle surface 420 and the base surface, and its magnitude is about 20 degrees, and the third rake angle γ is the angle between the third rake angle surface 430 and the base surface, and its magnitude is about 25 degrees.

[0102] Example 3

[0103] like Figure 7 As shown, this embodiment discloses a solid carbide milling cutter with an arc-shaped chip groove, comprising a blade body 200, a cutter head 100, and a tool handle 300 for connecting to a machine tool. The blade body is provided with four blade body chip grooves 210 extending spirally along the axial direction of the blade body, and the spiral angle thereof is 25 degrees. The cutter head is provided with four cutter head chip grooves 110 connected to the blade body chip groove (only two of the blade body chip grooves and the cutter head chip groove are shown in the figure as an example).

[0104] The cutter head 100 is a ball head with a radius of 8 mm. The surface of the cutter head chip groove 110 facing the cutting rotation direction is the cutter head rake face 120, and the cutter head rake face 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 the cutting edges are shown in the figure as an example), and the cutter head cutting edge includes an arc segment, that is, an arc cutting edge 140. The arc cutting edge is an arc and extends on the ball head to a distance less than 1 / 2R from the center axis of the milling cutter. The cutter head rake face is provided with a chip groove 400 extending along the arc cutting edge.

[0105] Figure 8An arc-shaped cutting edge 140 is shown with a chip groove 400, wherein the groove surface 410 of the arc-shaped cutting edge formed by the chip groove 400 is a first rake angle surface, wherein the first rake angle surface forms a first rake angle at each location of the arc-shaped cutting edge 410, and the chip groove has a second rake angle surface 420 connected to the first rake angle surface 410 to form a second rake angle, wherein the second rake angle is greater than the corresponding first rake angle.

[0106] Fig. 9 Shows Figure 8 CC cross-sectional view at a selected point c on the middle arc-shaped cutting edge 140, Fig. 9 The first rake angle α and the second rake angle β at the selected point c on the arc-shaped cutting edge 140 are exemplarily marked in the case where the chip groove 400 is provided. The first rake angle α is the angle between the groove surface 410 (i.e., the first rake angle surface) and the base surface of the arc-shaped cutting edge, and its magnitude is about 5 degrees, and the second rake angle β is the angle between the second rake angle surface 420 and the base surface, and its magnitude is about 10 degrees. In the case where the chip groove is not provided, the rake angle at the selected point a on the arc-shaped cutting edge 140 is the angle between the rake face 120 of the cutter head and the base surface, which is a negative value.

[0107] By setting a chip groove extending along the arc-shaped cutting edge, a first rake angle is formed through the groove surface of the arc-shaped cutting edge, thereby improving the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reducing the cutting resistance, and making the cutting easier. By setting a second rake angle greater than the corresponding first rake angle, a deeper chip groove can be set through a larger second rake angle under the premise of ensuring the strength and collapse resistance of the cutting edge, thereby increasing the chip holding and removal space, further reducing tool wear, and increasing the tool life.

[0108] The first rake angle of the arc-shaped cutting edge is variable, and increases as it is farther from the center axis of the milling cutter, from about 3 degrees closest to the center axis of the milling cutter to about 15 degrees at the farthest distance from the center axis of the milling cutter. By changing the first rake angle, the cutting resistance of the entire cutting edge is more evenly distributed when the ball end mill is cutting, avoiding concentrated or excessive cutting stress, and performing better when cutting curved surfaces and workpieces with complex shapes.

[0109] The chip groove extends to the groove surface of the blade chip groove 210, and the width of the chip groove gradually increases in the direction away from the center axis of the milling cutter, so that the chip discharge is smoother and the carrying space of the chips and the coolant can be further increased. The chip groove has a groove surface opposite to the groove surface 410 of the arc-shaped cutting edge, that is, a groove surface 440 away from the arc-shaped cutting edge, and the groove surface 440 away from the arc-shaped cutting edge is wavy, so that the chip groove has a groove surface extending in a wavy shape, so that the chip discharge is smoother, and the friction between the chips and the tool and the workpiece surface is further reduced.

[0110] Example 4

[0111] This embodiment discloses a solid carbide milling cutter with an arc-shaped chip groove, which is basically the same as the embodiment 1, except that:

[0112] The first rake angle of the arc-shaped cutting edge does not change significantly with the distance from the center axis of the milling cutter, and the first rake angles at different points of the arc-shaped cutting edge are basically the same. The chip groove does not have a groove surface extending in a wavy shape, and each surface thereof extends smoothly without wavy fluctuations.

[0113] Example 5

[0114] like Fig.10 As shown, this embodiment discloses an integral carbide milling cutter with an arc-shaped chip groove, which is a bull nose milling cutter, comprising a blade body 200, a cutter head 100, and a shank 300, the diameter of the milling cutter is 10 mm, and the blade body is provided with four blade body chip grooves 210 extending spirally along the axial direction of the blade body, and the spiral angle thereof is 25°.

[0115] The cutter head is correspondingly provided with four cutter head chip grooves 110 connected to the cutter body chip grooves, the surface of the cutter head chip groove facing the cutting rotation direction is the cutter head rake face 120, the cutter head rake face intersects 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 includes an arc segment, that is, an arc edge 140.

[0116] Fig.11 A partial schematic diagram of the arc-shaped cutting edge of a tool head is shown. The tool head 100 has a bottom surface 150 away from the blade body. The arc-shaped cutting edge 140 extends to the bottom surface to form a bottom edge 151. The area of ​​the bottom surface where no cutting edge is provided is treated to avoid air. The front cutting surface of the tool head is provided with a chip groove 400 extending along the arc-shaped cutting edge. The chip groove forms a groove surface 410 of the arc-shaped cutting edge, which is a first front angle surface. The first front angle surface forms a first front angle at each location of the arc-shaped cutting edge. The chip groove has a second front angle surface 420 connected to the first front angle surface to form a second front angle. The second front angle is greater than the corresponding first front angle.

[0117] The first rake angle of the arc-shaped cutting edge is variable, and becomes smaller as it is farther away from the center axis of the milling cutter. The first rake angle of the arc-shaped cutting edge is 10 degrees at the closest point to the center axis of the milling cutter, and is 5 degrees at the farthest point from the center axis of the milling cutter. The second rake angle is approximately 5 degrees greater than the corresponding first rake angle.

[0118] Fig.12Figure (b) is a schematic diagram of the cutting of the bull nose milling cutter. Figure (a) shows the local schematic diagram of the R angle in Figure (a). The figure shows cutting point a and cutting point b. Cutting point a is closer to the center axis of the milling cutter than cutting point b, but the bull nose milling cutter is mainly used for side wall cutting or bottom edge cutting. The linear velocity of the cutting edge of the R angle in the cutting part is not significantly affected by the distance from the center axis like a ball end milling cutter. In high-speed machining, it is necessary to ensure the strength of the cutting edge at the tip of the tool. The cutting thickness at cutting point b is larger, and the cutting thickness at cutting point a is smaller. The thinner the cutting is near the bottom edge, the larger the first rake angle is required. Therefore, the first rake angle is smaller as the cutting edge is farther away from the center axis of the milling cutter to ensure the strength of the entire R blade.

[0119] The first rake angle is formed by the groove surface of the arc-shaped cutting edge, thereby improving the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reducing the cutting resistance, making the cutting easier, and improving the sharpness along the extension direction of the arc-shaped cutting edge, which helps to more evenly guide the cutting force to be dispersed in different parts of the cutter head. The chip groove increases the chip holding space and acts as a chip removal channel during the cutting process, which helps to smoothly and timely discharge the chips. By setting the second rake angle, a deeper chip groove can be set while ensuring the strength of the cutting edge, obtaining a larger chip holding and chip removal space, reducing the risk of chip accumulation during the cutting process, significantly reducing tool wear, greatly extending the service life of the tool, and significantly improving the cutting speed and processing efficiency, ensuring a stable and efficient cutting process.

[0120] The milling cutter of the present application embodiment is prepared by the following method:

[0121] The required milling cutter blank is purchased from the market, and a semi-finished milling cutter is formed by fine grinding, and then the milling cutter is provided with the chip groove by a femtosecond pulse laser processing method, and finally a PVD coating treatment is performed to form a finished milling cutter. The step of fine grinding to form a semi-finished milling cutter is completed by a grinder. The PVD coating treatment is prepared by a method of the prior art. The chip groove is provided by a precision CNC laser machine purchased from DMG Mori Seiki Machine Tool Trading Co., Ltd. under the trade name LASERTEC 50Shape by a femtosecond pulse laser processing method.

[0122] Cutting test 1

[0123] The integral carbide milling cutters of Examples 1 and 2 of the present application were used to conduct metal cutting tests. The processed material was a nickel-based alloy. An integral carbide milling cutter without a chip groove was used as a control. Coolant was used for cooling.

[0124] Cutting workpiece: turbine blade

[0125] Workpiece material: Nickel-based alloy GH4080A-T6, hardness HRC30

[0126] Machine equipment: DMG80 five-axis

[0127] Cutting method: five-axis milling

[0128] Processing process: fine milling

[0129] The processing test results are shown in Table 1 below:

[0130] Table 1

[0131]

[0132]

[0133] Cutting test 2

[0134] The integral carbide milling cutters of Examples 1 and 2 of the present application were used to conduct metal cutting tests. The processed material was stainless steel. An integral carbide milling cutter without a chip groove was used as a control. Coolant was used for cooling.

[0135] Cutting workpiece: turbine blade

[0136] Workpiece material: stainless steel X20CR13-5, hardness HRC30

[0137] Machine equipment: DMG80 five-axis

[0138] Cutting method: five-axis milling

[0139] Processing process: fine milling

[0140] The processing test results are shown in Table 2 below:

[0141] Table 2

[0142]

[0143]

[0144] Cutting test 3

[0145] The integral carbide milling cutters of Examples 3 and 4 of the present application were used to conduct metal cutting tests. The processed material was a nickel-based alloy. An integral carbide milling cutter without a chip groove was used as a control. Coolant was used for cooling.

[0146] Cutting workpiece: turbine blade

[0147] Workpiece material: Nickel-based alloy GH4080A-T6, hardness HRC30

[0148] Machine equipment: DMG80 five-axis

[0149] Cutting method: five-axis milling

[0150] Processing process: rough milling

[0151] The processing test results are shown in Table 3 below:

[0152] Table 3

[0153]

[0154] Cutting test 4

[0155] The integral carbide milling cutter of Example 5 of the present application was used to conduct a metal cutting test. The processed material was a nickel-based alloy. An integral carbide milling cutter without a chip groove was used as a control. Coolant was used for cooling.

[0156] Cutting workpiece: turbine blade

[0157] Workpiece material: Nickel-based alloy GH4080A-T6, hardness HRC30

[0158] Machine equipment: DMG80 five-axis

[0159] Cutting method: five-axis milling

[0160] Processing process: Rough machining

[0161] The processing test results are shown in Table 4 below:

[0162] Table 4

[0163]

[0164] It can be seen from the above chip processing test results that the technical solution of the present application can improve the processing life and processing efficiency of the tool at the same time. On the one hand, the present application improves the sharpness of the cutting edge along the extension direction of the arc-shaped cutting edge, reduces the cutting resistance, makes cutting easier, reduces the generation of cutting heat, and reduces the cutting stress concentration phenomenon that may occur during the cutting process, so that the arc-shaped cutting edge will not be worn or broken due to local stress concentration. On the other hand, the chip groove is set to increase the chip capacity and chip removal space during the cutting process, which helps to smoothly discharge the chips generated during the cutting process in time, reduce the accumulation of cutting heat, and reduce the friction between the chips and the tool. The performance is even better when working with workpieces of complex shapes, the tool wear is significantly reduced, the service life of the tool is greatly extended, the cutting speed and processing efficiency are significantly improved, and a stable and efficient cutting process is ensured. When the processing efficiency is increased by 1.2 to 1.5 times, the tool life is also increased by 2 to 5 times, or even more than 8 times.

[0165] The above description is merely an exemplary embodiment of the present disclosure and is not intended to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A solid carbide milling cutter with an arc-shaped chip groove, comprising a cutter body, a cutter head, and an optional cutter handle for direct or indirect connection with a machine tool, The blade body is provided with a plurality of blade body chip grooves. The cutter head is provided with a plurality of cutter head chip grooves connected to the cutter body chip grooves, The surface of the cutter head chip groove facing the cutting rotation direction is the cutter head rake face. The front cutting surface of the cutter head intersects with the outer peripheral surface of the cutter head to form a cutter head edge for cutting, and the cutter head edge includes an arc segment, that is, an arc edge, characterized in that: The front cutting surface of the cutter head is provided with a chip groove extending along the arc-shaped cutting edge. The groove surface of the chip groove forming the arc-shaped cutting edge is a first rake angle surface, and the first rake angle surface forms a first rake angle at each location of the arc-shaped cutting edge. The chip groove has a second rake angle surface connected to the first rake angle surface to form a second rake angle, and the second rake angle is greater than the corresponding first rake angle. The diameter of the integral carbide milling cutter with the arc-shaped chip groove is 1mm to 50mm.

2. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The cutter head is a ball head, the arc-shaped cutting edge is an arc and extends on the ball head to a distance less than 1 / 2R from the center axis of the milling cutter, and the first rake angle of the arc-shaped cutting edge is variable, and increases as it is farther from the center axis of the milling cutter.

3. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The blade head has a bottom surface away from the blade body, the arc-shaped cutting edge extends to the bottom surface, and a clearance treatment is performed on the area of ​​the bottom surface where the arc-shaped cutting edge is not provided.

4. The solid carbide milling cutter with arc-shaped chip grooves according to claim 3, characterized in that: The first rake angle of the arc-shaped cutting edge is variable, and becomes smaller as it is farther from the center axis of the milling cutter.

5. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The first rake angle is 2 degrees to 20 degrees, for example, 5 degrees to 15 degrees, and the second rake angle is 7 degrees to 25 degrees, for example, 10 degrees to 20 degrees.

6. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The second rake angle is 2 degrees to 20 degrees greater than the corresponding first rake angle.

7. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: 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 arc-shaped chip grooves according to claim 1, characterized in that: The chip groove extends to the groove surface of the chip groove of the tool body.

9. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1 or 2, characterized in that: The width of the chip groove gradually increases in a direction away from the center axis of the milling cutter.

10. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The chip groove of the blade body extends spirally along the axial direction of the blade body, and the spiral angle thereof is between 3 and 45 degrees, such as 10 to 30 degrees, such as 15 to 25 degrees.

11. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The chip groove further comprises a third rake angle surface connected to the second rake angle surface to form a third rake angle, and the third rake angle is greater than the corresponding second rake angle.

12. The solid carbide milling cutter with arc-shaped chip grooves according to claim 11, characterized in that: The third rake angle is 10 to 30 degrees, for example, 15 to 25 degrees.

13. The solid carbide milling cutter with arc-shaped chip grooves according to claim 1, characterized in that: The chip flute has a flute surface extending in a wave shape.

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