Arc-shaped end blade reinforced fast feed milling cutter

Abstract

The utility model relates to machining technical field, concretely discloses a kind of arc-shaped end blade reinforced fast feed milling cutter;Including shank and tool bit;Tool bit includes knife main body and first blade, second blade, third blade and fourth blade in even interval;The end blade surface of first blade, second blade, third blade and fourth blade is set as arc shape;First blade, second blade, third blade and fourth blade are provided with recessed arc surface chip flow face between each other.In the utility model, by the end blade surface of blade design as arc shape, effectively strengthen blade edge strength, avoid the problem that traditional straight line blade edge needs to adopt small rake angle or negative rake angle due to insufficient strength, to reduce cutting resistance, reduce the requirement to machine tool spindle torque and tool clamping force, reduce the occurrence of chipping phenomenon, prolong tool life, so that without reducing tool speed under the premise of guaranteeing processing quality, effectively improve processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a high-speed feed milling cutter with a reinforced arc-shaped end edge. Background Technology

[0002] In the field of machining, end mills are key cutting tools whose performance directly affects machining quality, efficiency, and cost. As the manufacturing industry's demands for high-precision and high-efficiency machining continue to increase, the design and manufacturing technology of end mills is also constantly innovating and developing.

[0003] Currently, various types of end mills exist on the market, with standard end mills being the most common. However, standard end mills have revealed numerous problems in practical applications. Taking the patent "CN214212362U, A Variable-Pitch Variable-Lead Two-Flute End Mill" as an example, although this patent reduces the possibility of resonance and the superposition of cutting forces to some extent through the non-equal distribution of the end-edges and the unequal helix angle of the chip flutes, it still does not fundamentally solve the contradiction between the end-edge strength and the cutting force. The end-edges of existing standard end mills are mostly straight, resulting in uneven distribution of cutting forces across the entire edge, with the cutting force being particularly concentrated at the tip, making the tip extremely prone to chipping, which is even more pronounced when machining high-hardness materials. Simultaneously, to enhance the strength of the straight edge, the end-edge typically uses a small rake angle, and even a negative rake angle when machining high-hardness materials. This undoubtedly increases cutting resistance significantly, placing extremely high demands on the machine tool's spindle torque and tool clamping force. To avoid chipping and extend tool life, the cutting speed must be reduced, which severely restricts the improvement of machining efficiency.

[0004] Furthermore, some milling cutters face challenges such as poor machining quality and limited adaptability when machining specific materials or shapes. For example, in machining flat surfaces with small curvature, commonly used ball end mills suffer from low end-edge cutting speed, severe cutting edge wear, and low machining efficiency; ring end mills, on the other hand, have issues such as large undercutting and high surface residual height, which can easily lead to tool vibration in subsequent operations, affecting the surface machining accuracy of the workpiece. In summary, existing milling cutter technology has shortcomings in terms of end-edge strength, cutting force control, machining efficiency, and adaptability to different materials and shapes. An innovative milling cutter design is urgently needed to overcome these technical bottlenecks and meet the increasingly complex machining demands. The arc-shaped end-edge reinforced rapid feed milling cutter emerged in this technological context, aiming to solve a series of technical problems in existing technologies, such as low straight-edge strength, high cutting force, easy chipping, and low machining efficiency. Utility Model Content

[0005] In view of this, the present invention provides a circular arc-shaped end-edge reinforced rapid feed milling cutter to solve the technical problems in the prior art where the straight cutting edge has low strength, small rake angle or even negative rake angle is used to improve the cutting edge strength, resulting in high cutting resistance, high requirements for machine tool spindle torque and tool clamping force, and the cutting force is greatest at the tool tip, which is prone to chipping. In order to reduce chipping and extend tool life, the tool speed needs to be reduced, which leads to a decrease in machining efficiency.

[0006] This utility model embodiment provides a high-speed feed milling cutter with an arc-shaped end cutting edge, comprising:

[0007] A cylindrical handle and a cutting head integrally formed with the handle;

[0008] The blade head includes a blade body and a first blade, a second blade, a third blade, and a fourth blade that are evenly spaced apart;

[0009] The end faces of the first, second, third, and fourth cutting edges are arranged in an arc shape;

[0010] The first, second, third and fourth cutting edges are provided with concave arc-shaped chip guide surfaces between each pair of them.

[0011] Preferably, the diameter of the milling cutter is set to D, and the end face radii of the first, second, third, and fourth cutting edges are set to R1;

[0012] Wherein, when D ≥ 10 mm, R1 = 1.5D - 1.6D.

[0013] Preferably, the diameter of the milling cutter is set to D, and the end face radii of the first, second, third, and fourth cutting edges are set to R1;

[0014] When D < 10 mm, R1 = 1.0D - 1.2D.

[0015] Preferably, a first diameter line is provided through the center of the first cutting edge, the third cutting edge, and the blade tip;

[0016] A second diameter line is provided through the center of the second cutting edge, the fourth cutting edge, and the cutting head;

[0017] The end faces of the first and third cutting edges protrude from both sides of the first diameter line, respectively.

[0018] The end faces of the second and fourth cutting edges protrude from both sides of the second diameter line, respectively.

[0019] Preferably, the end faces of the first and third cutting edges, and the end faces of the second and fourth cutting edges protrude beyond the highest points of the first and second diameter lines, respectively. The distance between the highest point of the first and second diameter lines and the distance between the highest point of the first and second diameter lines is set as the arc height overcenter distance D. S ;

[0020] The D S =0.008D-0.01D.

[0021] Preferably, the end face of the milling cutter forms an end face rake angle α between the end face cutting plane and the end face cutting plane;

[0022] The width of the end-edge at the rake angle is set to W. a ;

[0023] The W a =0.09D.

[0024] Preferably, the milling cutter is made of metal material, and the hardness of the metal material is HRC45~50, and a=5°~7°.

[0025] Preferably, the milling cutter is made of metal material, and the hardness of the metal material is HRC55~62, and a=10°~12°.

[0026] Preferably, a transition section is provided between the blade body and the blade handle;

[0027] The overall length of the blade body is set to the same as the diameter of the blade, both being set to D.

[0028] Preferably, the first, second, third, and fourth cutting edges are all provided with a side clearance angle α1 formed between the end face and the generatrix of the corresponding handle;

[0029] Wherein, a1 = 3° - 7°.

[0030] The arc-shaped end-edge reinforced rapid feed milling cutter provided by this utility model has the following beneficial effects:

[0031] In this invention, by designing the cutting edge face as an arc, the strength of the cutting edge is effectively enhanced, avoiding the problem that traditional straight cutting edges need to use a small rake angle or a negative rake angle due to insufficient strength. This reduces cutting resistance and decreases the requirements for machine tool spindle torque and tool clamping force.

[0032] Meanwhile, the arc-shaped end face makes the cutting force distribution more uniform, reduces the peak cutting force at the tool tip, reduces the occurrence of chipping, and extends tool life. This allows for the maintenance of machining quality without reducing tool speed, effectively improving machining efficiency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0034] Figure 1 This is a structural schematic diagram of a high-speed feed milling cutter with a reinforced arc-shaped end cutting edge;

[0035] Figure 2 This is a schematic diagram of the head structure of a high-speed feed milling cutter with a reinforced arc-shaped end edge;

[0036] Figure 3 This is a schematic diagram of the end face structure of a high-speed feed milling cutter with a reinforced arc-shaped end edge;

[0037] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure;

[0038] Parts and their numbers in the diagram:

[0039] 110 - Handle, 120 - Blade tip;

[0040] 121-Knife body, 122-First cutting edge, 123-Second cutting edge, 124-Third cutting edge, 125-Fourth cutting edge, 126-End cutting edge, 127-Chip guide surface;

[0041] 211-Tool diameter, 212-End cutting face radius, 213-First diameter line, 214-Second diameter line, 215-End cutting rake angle, 216-Generatrix, 217-End cutting width, 218-Transition section. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Unless otherwise specified, embodiments of the present invention and the various features thereof can be combined with each other, all within the protection scope of the present invention.

[0043] Example 1

[0044] Please see Figure 1 This utility model provides a high-speed feed end mill with an arc-shaped end-edge reinforcement. In the prior art, the main cutting edge of a general cutting tool is a straight edge, and the cutting force is distributed across the entire cutting edge. Since the cutting force is greatest at the tool tip, it is prone to chipping, especially when machining high-hardness materials. To reduce chipping and extend tool life, the tool speed is often reduced, which also reduces machining efficiency. In this embodiment, a specially designed end-edge is used to solve this problem. It can achieve lower cutting force and better tool tip strength without reducing or even increasing the feed rate, thus maintaining a relatively good tool life while improving efficiency.

[0045] Please see Figure 1 and Figure 2In this embodiment, the arc-shaped end-edge reinforced rapid feed milling cutter includes a cylindrical shank 110 and an integrally formed cutter head 120 with the shank 110; the cutter head 120 includes a cutter body 121 and a first cutting edge 122, a second cutting edge 123, a third cutting edge 124 and a fourth cutting edge 125 spaced evenly apart; the end-edge surfaces 126 of the first cutting edge 122, the second cutting edge 123, the third cutting edge 124 and the fourth cutting edge 125 are arc-shaped; a concave arc-shaped chip guide surface 127 is provided between each pair of the first cutting edge 122, the second cutting edge 123, the third cutting edge 124 and the fourth cutting edge 125.

[0046] In actual machining, the arc-shaped end-edge reinforced rapid feed milling cutter is connected and fixed to the machine tool via a cylindrical tool holder 110, and the entire tool rotates with the help of the machine tool's drive. During machining, the cutter head 120, which is integrated with the tool holder 110, serves as the cutting core, in which the first cutting edge 122, the second cutting edge 123, the third cutting edge 124, and the fourth cutting edge 125, which are evenly spaced, participate in the cutting operation.

[0047] Because the cutting edge has an arc-shaped end face 126, when the tool contacts the workpiece, the arc-shaped end face can cut into the material more smoothly, and the cutting force is more rationally distributed on the arc surface. At the same time, the chip guide surface 127, which is a concave arc surface between the two cutting edges, plays a role in the cutting process, and promptly discharges the chips generated by cutting along the arc surface, avoiding chip accumulation that affects the cutting effect.

[0048] Specifically, in existing technologies, the cutting force is greatest at the tip of straight-edged cutting tools, making them prone to chipping, especially when machining high-hardness materials. The arc-shaped end-edge design of this tool alters the distribution of cutting force, reducing stress concentration at the tip and significantly improving tip strength, effectively solving the chipping problem.

[0049] Compared to traditional straight-edged cutting tools that suffer from high cutting resistance due to small or negative rake angles caused by strength issues, this tool's unique matching design of a 126mm rounded end-edge and a 125mm rake angle reduces cutting resistance, thereby decreasing the demands on machine spindle torque and tool clamping force. Previously, reducing chipping and extending tool life required lowering tool speeds, leading to inefficiency. This tool maintains lower cutting forces and better tool tip strength without reducing or even increasing feed rate, improving machining efficiency and extending tool life. This structural design can be applied to the end-edge design of various solid carbide end mills, delivering excellent cutting performance in a variety of machining scenarios.

[0050] Furthermore, the diameter 211 of the milling cutter is set to D, and the end face radius 212 of the first cutting edge 122, the second cutting edge 123, the third cutting edge 124 and the fourth cutting edge 125 is set to R1; wherein, when D≥10mm, R1=1.5D-1.6D.

[0051] In this embodiment, the core design principle of the end-edge radius 212 is based on the cutting characteristics of large-diameter tools (D≥10mm). By setting the end-edge radius R1 to 1.5-1.6 times the tool diameter 211, an arc structure adapted to the tool size is formed. This proportional relationship ensures the rationality of the curvature of the arc end-edge 126 and also works synergistically with the overall layout of the cutting edge.

[0052] Its main advantage is that a larger radius of curvature can significantly increase the effective cutting length of the end face, allowing the cutting force to be dispersed in a larger contact area, avoiding the local stress concentration problem that is prone to occur on large-diameter tools with traditional straight cutting edges, thereby enhancing the cutting edge's resistance to chipping.

[0053] Meanwhile, this proportional design can maintain a reasonable cutting rake angle while ensuring the strength of the cutting edge, effectively reducing the resistance of large-diameter tools during high-speed cutting, reducing the load requirements on the machine tool spindle, and balancing the improvement of machining efficiency and tool life.

[0054] Furthermore, the diameter 211 of the milling cutter is set to D, and the end face radius 212 of the first cutting edge 122, the second cutting edge 123, the third cutting edge 124 and the fourth cutting edge 125 is set to R1; wherein, when D < 10mm, R1 = 1.0D - 1.2D.

[0055] The arc size is designed to be 5% to 10% of the straight cutting edge length. Incremental design: the smaller the tool diameter (211), the larger the arc, and the smaller the increment in cutting edge length. This is based on actual manufacturing experience; otherwise, the arc curvature of small-diameter end mills would be very small, making it impossible for the grinding wheel to grind the cutting edge shape during tool manufacturing, and the excessive curvature of the cutting edge would drastically increase cutting resistance.

[0056] In this embodiment, the design is based on the cutting characteristics and manufacturing process limitations of small-diameter end mills (D<10mm), and constructs an adaptation logic of "diameter-arc radius": On the one hand, by setting the ratio R1=1D-1.2D, combined with the incremental rule of "arc size is 5%-10% of the straight cutting edge length", the curvature of the arc end edge 126 of the small-diameter tool is ensured to be moderate - the smaller the diameter, the larger the arc is, which avoids the inability to form the shape during grinding due to excessive curvature, and also prevents the cutting resistance from surging due to excessive curvature; on the other hand, based on actual manufacturing experience, the "edge strength requirement" and "process feasibility" are balanced, so that the arc size can enhance the tool tip performance while adapting to the machining accuracy requirements of small-diameter tools.

[0057] Furthermore, from a performance perspective, a reasonable arc radius can disperse the concentrated cutting force at the tip of a small-diameter end mill, solving the problem of easy chipping of traditional straight cutting edges. At the same time, it does not require relying on a small or negative rake angle to increase strength, effectively reducing cutting resistance and reducing the requirements for machine tool spindle torque and clamping force. From a process perspective, the radius range of 1D-1.2D and the incremental design of 5%-10% are suitable for the machining capabilities of grinding wheels, avoiding the inability to form the cutting edge due to abnormal curvature, and ensuring the manufacturing feasibility of small-diameter end mills. From an efficiency perspective, while ensuring tool life, there is no need to reduce the feed rate, and the feed rate can even be increased, balancing the machining efficiency and stability of small-diameter end mills.

[0058] Furthermore, a first diameter line 213 is provided through the center of the first cutting edge 122, the third cutting edge 124 and the blade head 120; a second diameter line 214 is provided through the center of the second cutting edge 123, the fourth cutting edge 125 and the blade head 120; the end cutting surfaces 126 of the first cutting edge 122 and the third cutting edge 124 protrude from both sides of the first diameter line 213; the end cutting surfaces 126 of the second cutting edge 123 and the fourth cutting edge 125 protrude from both sides of the second diameter line 214.

[0059] Furthermore, the end face 126 of the first cutting edge 122 and the third cutting edge 124, and the end face 126 of the second cutting edge 123 and the fourth cutting edge 125 respectively protrude beyond the highest point of the first diameter line 213 and the second diameter line 214. The distance between the highest point of the first diameter line 213 and the second diameter line 214 is set as the arc height point through-center distance D. S The D S =0.008D-0.01D.

[0060] Specifically, the core of this structural design is the symmetrical arrangement of the four cutting edges using two mutually perpendicular diameter lines (first diameter line 213 and second diameter line 214). The first cutting edge 122 and the third cutting edge 124 are distributed on both sides of the first diameter line 213, and the second cutting edge 123 and the fourth cutting edge 125 are distributed on both sides of the second diameter line 214. Furthermore, the arc-shaped end face 126 of all cutting edges protrudes outward from the corresponding diameter line, with the maximum protrusion distance (the distance D from the arc height to the center) being... S The value is set to 0.008-0.01 times the tool diameter 211.

[0061] This design offers several advantages: First, the symmetrical protruding structure ensures that the cutting force is evenly distributed along both sides of the diameter line, avoiding vibration and edge damage caused by traditional unilateral force application. Second, the 0.008D-0.01D centering allowance enhances the edge's resistance to chipping through a moderately protruding, reinforced structure, without affecting the normal cutting range. Third, the symmetrical arc shape, combined with the chip guide surface 127, guides chips out in an orderly manner, reducing congestion and wear. Fourth, the proportional centering allowance design adapts to tools of different diameters, balancing manufacturing feasibility and performance stability.

[0062] Further, please see Figure 3 and Figure 4 The end face of the milling cutter forms an end face rake angle 215(a) between the end face rake face and the end face cutting plane; the end face rake angle 215 is the angle formed between the end face rake face (the surface through which the chip flows out) and the end face cutting plane (a reference plane perpendicular to the tangent direction of the main cutting edge at the cutting point) by the rake face being inclined relative to the reference plane, and its formation is related to the end face shape and the rake face inclination trajectory; the end face width 217 of the end face rake angle 215 is set to W. a The W a =0.09D.

[0063] Furthermore, the milling cutter is made of metal material, and the hardness of the metal material is HRC45~50, and a=5°~7°.

[0064] Furthermore, the milling cutter is made of metal material, and the hardness of the metal material is HRC55~62, and a=10°~12°.

[0065] Furthermore, a transition section 218 is provided between the blade body 121 and the blade handle 110;

[0066] The overall length of the blade body 121 is set to be the same as the diameter of the blade 211, both being set to D.

[0067] Specifically, the core function of the rake angle is to balance the cutting edge strength and cutting resistance, and its value directly depends on the hardness characteristics of the material being machined. When the hardness of the metal material is in the HRC 45-50 range, the material's resistance to deformation is relatively moderate. At this time, the rake angle is set to 5-7 degrees because the impact and wear on the cutting edge are at a moderate level at this hardness. A smaller rake angle can reduce the rake face inclination, making the structure of the metal material at the cutting edge thicker, thereby enhancing the cutting edge's resistance to chipping and wear. However, when the material hardness increases to HRC 55-62, the internal grains of the material are denser and the hardness is higher. The extrusion force and friction damage on the cutting edge during cutting increase significantly. If the rake angle is too large, the cutting edge will become thin due to the excessive inclination, making it prone to chipping or breakage under the impact of high-hardness materials. Therefore, the rake angle α is adjusted to 10-12 degrees (still larger than the standard rake angle for materials with higher hardness). This can optimize the chip flow path by moderately increasing the rake angle, while ensuring that the cutting edge has sufficient thickness to withstand the cutting load of high-hardness materials. Meanwhile, this design relies on the structural advantages of the arc-shaped end cutting edge 126 itself. The arc shape can disperse the concentrated cutting force at the tip of the cutter, which improves the overall strength of the end cutting edge from a structural perspective. This provides more space for the design of the rake angle, so that even if the rake angle set for materials with different hardness is larger than the rake angle of the standard straight-edge end mill (the traditional standard design is 3° to 5° or even negative rake angle), the cutting edge strength will not be sacrificed. On the contrary, the cutting needs of materials with different hardness can be adapted through reasonable rake angle differentiation settings.

[0068] From the perspectives of both machining performance and tool life, this rake angle setting scheme has significant advantages. On the one hand, setting corresponding rake angles for materials with different hardness can effectively reduce cutting forces and improve machining efficiency. For medium-hardness materials with HRC45-50, a rake angle of 5-7 degrees is larger than the traditional standard rake angle, which can reduce the friction area between the rake face and the chip, allowing the chip to flow more smoothly along the rake face, reducing frictional resistance during the cutting process, reducing the burden on the machine tool spindle torque and tool clamping force, and avoiding machine tool vibration caused by excessive cutting forces. For high-hardness materials with HRC55-62, a rake angle of 10-12 degrees, while ensuring the strength of the cutting edge, is also more conducive to chip removal than the traditional negative rake angle or extremely small rake angle, reducing chip accumulation and compression at the cutting edge, reducing the generation of cutting heat, and thus reducing tool wear caused by excessive cutting heat. On the other hand, the combination of the arc-shaped cutting edge 126 and the differentiated rake angle can significantly extend tool life: the arc-shaped cutting edge 126 itself disperses the concentrated cutting force at the tool tip through its curved surface structure, solving the problem of easy chipping of traditional straight-edged tool tips. The rake angle, set to decrease with material hardness, further strengthens the cutting edge strength for high-hardness materials, preventing rapid chipping due to excessive material hardness. Simultaneously, the larger rake angle design reduces cutting force and heat, decreasing the tool edge wear rate. This allows the tool to maintain stable cutting performance when machining materials of varying hardness, eliminating the need for frequent tool changes, thus improving machining continuity and reducing production costs. Furthermore, this design is versatile, adaptable to machining various metal materials with hardnesses ranging from HRC45 to 62, eliminating the need for separate end mills designed for different hardness materials, expanding the tool's applicability and enhancing machining flexibility.

[0069] Furthermore, the first cutting edge 122, the second cutting edge 123, the third cutting edge 124, and the fourth cutting edge 125 are all provided with a clearance angle formed between the end face 126 and the generatrix 216 of the corresponding tool holder 110. Taking the machined surface of the workpiece (or a reference surface parallel to that surface) formed after cutting by the end face of the milling cutter as a reference, the flank face of the end face (located outside the main cutting edge, i.e., the side away from the rake face) is inclined outward relative to this reference surface. In this inclined state, the angle formed between the flank face and the machined surface of the workpiece (or its reference surface) is the clearance angle. Its formation position is closely related to the overall structure of the end face, especially adapting to the arc-shaped end face 126 of this invention. The curved surface structure of the arc-shaped end face 126 causes the tilt trajectory of the flank face to change with the arc curve, thereby ensuring that the clearance angle can be stably formed at different cutting positions of the end face (including the tip arc area), avoiding excessive friction between the flank face and the machined surface of the workpiece.

[0070] The clearance angle is the angle between the end face of the end cutter (the surface that contacts the machined surface of the workpiece after cutting) and the machined surface of the workpiece (or a reference plane parallel to that surface) within the "working profile".

[0071] The "working profile" must meet the following requirements: include the normal to a selected point on the main cutting edge of the end face; be perpendicular to the feed direction of the milling cutter, and ensure that it can accurately reflect the relative positional relationship between the flank face and the workpiece surface.

[0072] The core design of this utility model is the reinforcement of the arc-shaped end blade 126. The formation of the side clearance angle is deeply tied to this structure: the back face of traditional straight-edged end blades is mostly a planar inclined plane, and the side clearance angle is prone to problems such as being too small (leading to increased friction) or too large (leading to insufficient edge strength) at the blade tip; while the arc-shaped end blade 126 of this utility model makes the back face present a curved inclined shape that matches the arc edge, which allows the side clearance angle to be evenly distributed along the arc edge. Especially in the arc area of ​​the blade tip (the part where the tip of a traditional straight-edged blade is prone to chipping and concentrated friction), the uniformity of the side clearance angle can avoid excessive local compression between the back face and the machined surface of the workpiece. At the same time, combined with the advantage of the arc-shaped end blade 126 of this utility model to improve the edge strength, there is no need to strengthen the edge by reducing the side clearance angle, which provides structural support for the rational design of the side clearance angle.

[0073] In this embodiment, the backlash angle is formed by the inclination of the flank face, which can avoid large-area sliding friction between the flank face and the machined surface of the workpiece after the end-cutting edge, thereby reducing cutting resistance and cutting heat, which is consistent with the advantage of lower cutting force in this example; and the existence of the backlash angle can reduce flank face wear, indirectly extending tool life, while avoiding the increase in surface roughness of the machined surface of the workpiece caused by friction, thus ensuring machining quality.

[0074] Furthermore, this utility model is a "fast feed milling cutter". Under fast feed conditions, the relative movement speed between the tool and the workpiece is higher. The backlash angle can be optimized by optimizing the contact state of the flank face to ensure that friction loss can still be reduced without reducing the feed speed, thus supporting the dual technical requirements of "fast feed + low cutting force".

[0075] Wherein, a1 = 3° - 7°. The clearance angle is set at 3-7 degrees, which is determined by combining the structural advantages of the end mill's reinforced arc-shaped end cutting edge 126 with the technical goals of "rapid feed, low cutting force, and anti-chipping". On the one hand, this angle range can accurately balance the need to reduce friction and ensure the strength of the cutting edge. Compared with a smaller clearance angle (such as less than 3 degrees), 3-7 degrees can avoid excessive sliding friction between the flank face and the machined surface of the workpiece after the end cutting edge has finished cutting, effectively reducing cutting resistance and cutting heat under rapid feed conditions. Compared with a larger clearance angle (such as greater than 7 degrees), this range can also avoid the end cutting edge structure being too thin due to excessive flank face inclination. In particular, combined with the characteristics of the arc-shaped end cutting edge 126 itself in dispersing cutting force and improving cutting edge strength, it can further ensure that the cutting edge still has sufficient anti-chipping ability when machining high-hardness materials and rapid feed cutting, while avoiding the problem of increased surface roughness of the machined workpiece that may be caused by an excessively large clearance angle. Ultimately, it achieves the design goal of "rapid feed without reducing efficiency and low cutting force without sacrificing life".

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-speed feed end mill with an arc-shaped end cutting edge, characterized in that, include: A cylindrical handle and a cutting head integrally formed with the handle; The blade head includes a blade body and a first blade, a second blade, a third blade, and a fourth blade that are evenly spaced apart; The end faces of the first, second, third, and fourth cutting edges are arranged in an arc shape; The first, second, third and fourth cutting edges are provided with concave arc-shaped chip guide surfaces between each pair of them.

2. The arc-shaped end-cut reinforced rapid feed milling cutter according to claim 1, characterized in that, The diameter of the milling cutter is set to D, and the end face radii of the first, second, third and fourth cutting edges are set to R1. Wherein, when D≥10mm, R1=1.5D-1.6D.

3. The arc-shaped end-edge reinforced rapid feed milling cutter according to claim 1, characterized in that, The diameter of the milling cutter is set to D, and the end face radii of the first, second, third and fourth cutting edges are set to R1. When D < 10 mm, R1 = 1.0D - 1.2D.

4. A rapidly feed end mill with an arc-shaped end cutting edge as described in claim 2 or 3, characterized in that, A first diameter line is provided through the center of the first cutting edge, the third cutting edge, and the cutting head; A second diameter line is provided through the center of the second cutting edge, the fourth cutting edge, and the cutting head; The end faces of the first and third cutting edges protrude from both sides of the first diameter line, respectively. The end faces of the second and fourth cutting edges protrude from both sides of the second diameter line, respectively.

5. A rapid feed milling cutter with an arc-shaped end cutting edge as described in claim 4, characterized in that, The end edge surfaces of the first and third blades and the end edge surfaces of the second and fourth blades are respectively convex to the first and second diameter lines, and the distance between the highest points of the first and second diameter lines and the first and second diameter lines is set as a circular arc height over center distance D S ; The D S =0.008D-0.01D.

6. A rapidly feed end mill with an arc-shaped end cutting edge as described in claim 2 or 3, characterized in that, The end face of the milling cutter forms an end face rake angle α with the end face cutting plane; The width of the end-edge at the rake angle is set to W. a ; The W a =0.09D.

7. A rapid feed milling cutter with an arc-shaped end cutting edge as described in claim 6, characterized in that, The milling cutter is made of metal material with a hardness of HRC45-50 and a = 5°-7°.

8. A rapid feed milling cutter with an arc-shaped end cutting edge as described in claim 1, characterized in that, The milling cutter is made of metal material with a hardness of HRC55-62 and a = 10°-12°.

9. A rapid feed milling cutter with an arc-shaped end cutting edge as described in claim 3, characterized in that, A transition section is provided between the blade body and the blade handle; The overall length of the blade body is set to the same as the diameter of the blade, both being set to D.

10. A rapidly feed end mill with an arc-shaped end cutting edge as described in claim 1, characterized in that, The first, second, third, and fourth cutting edges are all provided with a side clearance angle α1 formed between the end cutting face and the generatrix of the corresponding handle; Wherein, a1 = 3° - 7°.

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