Ball-end milling cutter
By designing the end cutting edge of the ball end mill to have a gradually increasing rake angle and setting a circumferential chip removal groove, the problem of chipping of the ball end mill during radial cutting was solved, thus improving cutting ability and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-20
AI Technical Summary
When ball end mills are used for radial cutting, the part of the end cutting edge far from the center axis is prone to chipping, which affects the service life.
The end cutting edge of the ball end mill is designed to include a first cutting section, a second cutting section, and a third cutting section connected in sequence. The rake angle gradually increases to enhance the strength of the end cutting edge. Chip removal grooves and tooth clearances corresponding to the end cutting edge are provided on the head to facilitate chip removal.
It improves the cutting ability of ball end mills at high cutting speeds, reduces the probability of end-edge chipping, and extends service life.
Smart Images
Figure CN224011305U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to tool technical field, especially a ball head milling cutter. BACKGROUND
[0002] Ball head milling cutter is the cutter that is assembled on milling machine for milling all kinds of curved surface, circular arc groove with the blade similar to ball head.
[0003] In the related art, when the ball head milling cutter is milled, the linear velocity of the end edge gradually increases along the radial direction of the ball head milling cutter, and accordingly, the part of the end edge far away from the central axis of the ball head milling cutter is prone to produce chipping when cutting the material, thereby affecting the service life of the ball head milling cutter. SUMMARY
[0004] The utility model discloses a ball head milling cutter with higher end edge strength.
[0005] The ball head milling cutter provided by the utility model embodiment comprises a shank part and a head part, the head part is connected with the shank part, a plurality of end edges are formed at one end of the head part away from the shank part, the plurality of end edges are distributed in a circumferential interval around a preset axis of the head part, along the direction away from the preset axis, the end edge comprises a first cutting section, a second cutting section and a third cutting section connected in sequence, the first cutting section has a first cutting rake angle, the second cutting section has a second cutting rake angle, the third cutting section has a third cutting rake angle, and the first cutting rake angle, the second cutting rake angle and the third cutting rake angle are gradually increased in value.
[0006] The ball head milling cutter provided by the utility model has at least the following beneficial effects: in the ball head milling cutter of the utility model, along the direction away from the preset axis of the head part, the end edge comprises the first cutting section, the second cutting section and the third cutting section connected in sequence, when the ball head milling cutter of the utility model works, the linear velocity of the first cutting section, the linear velocity of the second cutting section and the linear velocity of the third cutting section gradually increase, and since the first cutting rake angle of the first cutting section, the second cutting rake angle of the second cutting section and the third cutting rake angle of the third cutting section are gradually increased in value, the strength of the first cutting section, the second cutting section and the third cutting section gradually increases, and since the third cutting rake angle of the third cutting section is larger than the first cutting rake angle of the first cutting section and the second cutting rake angle of the second cutting section, the end edge of the ball head milling cutter of the utility model can cut into the workpiece more smoothly under the condition of higher cutting linear velocity when cutting the workpiece, thereby improving the service life of the ball head milling cutter of the utility model.
[0007] The ball head milling cutter provided by the utility model embodiment has the first cutting rake angle of-11° to-9°, the second cutting rake angle of-7° to-5° and the third cutting rake angle of-4° to-2°.
[0008] The ball end mill has end edges with an end edge first clearance angle and an end edge second clearance angle, the end edge first clearance angle is 8° to 12°, and the end edge second clearance angle is 18° to 22°.
[0009] The ball end mill has a plurality of peripheral edges arranged on the periphery of the head, the peripheral edges are arranged in one-to-one correspondence with the end edges, and the corresponding peripheral edges and end edges are connected, a chip groove is formed between any two adjacent peripheral edges, the spiral angle of the chip groove is 30°, and a tooth gap is formed between any two adjacent end edges.
[0010] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0011] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0012] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0013] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0014] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0015] The ball end mill has peripheral edges with a peripheral edge rake angle and a peripheral edge arc clearance angle, the peripheral edge rake angle is -7° to -5°, and the peripheral edge arc clearance angle is 7° to 9°.
[0016] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS
[0017] The present application will be further described below in conjunction with the drawings and embodiments.
[0018] Figure 1 FIG. 1 is a structure schematic view of a ball end mill according to an embodiment of the present application;
[0019] Figure 2 FIG. 2 is another view of the ball end mill shown in FIG. 1; Figure 1
[0020] Figure 3 FIG. 3 is a structure schematic view of a first cutting section according to an embodiment of the present application;
[0021] Figure 4 Structure schematic view of the second cutting section of one embodiment of the utility model;
[0022] Figure 5 Structure schematic view of the third cutting section of one embodiment of the utility model;
[0023] Figure 6 Structure schematic view of the peripheral edge of one embodiment of the utility model;
[0024] Figure 7 For Figure 2 A-A cross section schematic view of the ball end mill.
[0025] Reference signs:
[0026] Handle 100;
[0027] Head 200; Preset axis 201; End edge 210; First cutting section 211; Second cutting section 212; Third cutting section 213; Peripheral edge 220; Chip flute 230; Tooth gap 240. Specific implementation
[0028] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.
[0029] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as the limitation of the utility model.
[0030] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, the second is described, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0031] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.
[0032] Reference is made below Figures 1 to 7 The ball end mill of the present application is described in detail.
[0033] Reference Figure 1 And Figure 2 According to the ball end mill of the embodiment of the present application, the head portion 200 is connected with the shank portion 100, and a plurality of end edges 210 are formed at the end of the head portion 200 away from the shank portion 100, the plurality of end edges 210 are distributed in a circumferential direction around a preset axis 201 of the head portion 200, and in a direction away from the preset axis 201, the end edge 210 comprises a first cutting section 211, a second cutting section 212 and a third cutting section 213 connected in sequence, the first cutting section 211 has a first cutting rake angle, the second cutting section 212 has a second cutting rake angle, the third cutting section 213 has a third cutting rake angle, and the first cutting rake angle, the second cutting rake angle and the third cutting rake angle are gradually increased in value.
[0034] It should be noted that, since the first cutting section 211, the second cutting section 212 and the third cutting section 213 of the end edge 210 are distributed in a direction away from the preset axis 201, the linear velocity of the first cutting section 211, the second cutting section 212 and the third cutting section 213 gradually increases during the cutting process of the workpiece by the ball end mill, and since the linear velocity of the third cutting section 213 is larger than that of the first cutting section 211 and the second cutting section 212, the third cutting section 213 is prone to chipping during the cutting process of the workpiece by the ball end mill.
[0035] In the embodiment, since the first cutting rake angle of the first cutting edge, the second cutting rake angle of the second cutting edge and the third cutting rake angle of the third cutting edge are gradually increased in value, the strength of the first cutting edge, the second cutting edge and the third cutting edge gradually increases, and since the third cutting rake angle of the third cutting section 213 is larger than the first cutting rake angle of the first cutting section 211 and the second cutting rake angle of the second cutting section 212, the end edge 210 can cut into the workpiece more smoothly under a higher cutting linear velocity during the cutting process of the workpiece by the ball end mill of the present application, thereby improving the service life of the ball end mill of the present application.
[0036] In some embodiments of the present application, reference Figures 3 to 5 The first cutting rake angle a1 is -11° to -9°, the second cutting rake angle a2 is -7° to -5°, and the third cutting rake angle a3 is -4° to -2°.
[0037] It can be understood that setting the first cutting rake angle to -11° to -9°, the second cutting rake angle to -7° to -5°, and the third cutting rake angle to -4° to -2° can gradually increase the strength of the first cutting edge, the second cutting edge, and the third cutting edge, so that the strength distribution of each part of the end edge 210 is more reasonable, thereby reducing the risk of chipping of the end edge 210 during cutting.
[0038] Preferably, in some embodiments of the utility model, the first cutting rake angle is -10°, the second cutting rake angle is -6°, and the third cutting rake angle is -3°.
[0039] In some embodiments of the utility model, with reference to Figures 3 to 5 , the end edge 210 has an end edge first clearance angle b1 of 8° to 12° and an end edge second clearance angle b2 of 18° to 22°.
[0040] It can be understood that since the end edge 210 has an end edge first clearance angle and an end edge second clearance angle, and the end edge first clearance angle is 8° to 12° and the end edge second clearance angle is 18° to 22°, the entire end edge 210 has higher strength, thereby further reducing the probability of chipping of the end edge 210 during cutting.
[0041] Preferably, in some embodiments of the utility model, the end edge first clearance angle is 10° and the end edge second clearance angle is 20°.
[0042] In some embodiments of the utility model, with reference to Figure 1 and Figure 2 , the head 200 is provided with a plurality of peripheral edges 220 on the circumferential side, the peripheral edges 220 are one-to-one corresponding in number to the end edges 210, and the corresponding peripheral edges 220 and end edges 210 are connected, a chip removal groove 230 is formed between any two adjacent peripheral edges 220, the spiral angle of the chip removal groove 230 is 30°, a tooth gap 240 is formed between any two adjacent end edges 210, and the tooth gap 240 is one-to-one corresponding and communicated with the chip removal groove 230.
[0043] It can be understood that the waste generated during the cutting of the end edge 210 can enter the tooth gap 240 and then enter the chip removal groove 230 along the tooth gap 240, and finally be discharged along the chip removal groove 230; the waste generated during the cutting of the peripheral edge 220 can directly enter the chip removal groove 230 and then be discharged along the chip removal groove 230; the setting of the peripheral edge 220 enables the peripheral edge 220 to perform fine machining on the workpiece immediately after the end edge 210 performs rough machining on the workpiece.
[0044] It is understandable that since the helix angle of the chip removal groove 230 is 30°, the corresponding helix angle of the peripheral cutting edge 220 is also 30°. Setting the helix angle of the peripheral cutting edge 220 to 30° enables the peripheral cutting edge 220 to have higher strength and greater cutting force in the precision milling of the workpiece.
[0045] In a further embodiment of this utility model, the chip removal groove 230 is grooved in a stepped manner.
[0046] It is understandable that by setting the slot of the chip removal groove 230 to a stepped shape, the chip-carrying space of the chip removal groove 230 can be increased, making the chip removal of the ball end mill of this utility model smoother.
[0047] In some embodiments of this utility model, reference is made to Figure 6 The circumferential cutting edge 220 has a circumferential cutting edge front angle and a circumferential cutting edge arc back angle. The circumferential cutting edge front angle c1 is -7° to -5°, and the circumferential cutting edge arc back angle c2 is 7° to 9°.
[0048] It is understandable that setting the rake angle of the peripheral cutting edge 220 to -7° to -5° would give the peripheral cutting edge 220 higher strength and enable it to generate greater cutting force during the cutting process.
[0049] It is understandable that setting the peripheral cutting edge radius of the peripheral cutting edge 220 to 7° to 9° allows the peripheral cutting edge 220 to smoothly cut materials with higher hardness.
[0050] In a further embodiment of this utility model, the flank face of the end cutting edge 210 and the flank face of the peripheral cutting edge 220 are smoothly connected, so that the flank face of the end cutting edge 210 can gradually transition from a plane to the arc surface of the flank face of the peripheral cutting edge 220, thereby allowing the planar clearance angle of the end cutting edge 210 to gradually transition into the circular arc clearance angle of the peripheral cutting edge 220. This improves the cutting accuracy of the ball end mill of this application, increases the strength at the junction between the end cutting edge 210 and the peripheral cutting edge 220, and reduces the probability of chipping at the junction between the end cutting edge 210 and the peripheral cutting edge 220.
[0051] In some embodiments of this utility model, preferably, the rake angle of the circumferential blade 220 is -6° and the clearance angle of the circumferential blade 220 is 8°.
[0052] In some embodiments of this utility model, the blade width of the peripheral blade 220 is 1.35mm.
[0053] It is understandable that the cutting width of the peripheral blade 220 is set to 1.35mm so that the peripheral blade 220 can smoothly cut materials with higher hardness.
[0054] In some embodiments of this utility model, four sets of peripheral blades 220 and end blades 210 are provided in a one-to-one correspondence.
[0055] It can be understood that, since the four groups of the peripheral edges 220 and the end edges 210 are one-to-one corresponding, on the one hand, the ball head milling cutter of the utility model can have more peripheral edges 220 and end edges 210 to participate in milling of the workpiece when working, so as to improve the service life of the ball head milling cutter of the utility model; on the other hand, the ball head milling cutter of the utility model can realize larger feeding operation in processing with multiple inclination angles.
[0056] In some embodiments of the utility model, the core diameter of the head 200 is 0.7 of the edge diameter of the peripheral edge 220.
[0057] It can be understood that, since the core diameter of the head 200 is 0.7 of the edge diameter of the peripheral edge 220, the ball head milling cutter of the utility model has higher bending strength in the process of high-speed cutting of high-hardness steel.
[0058] In further embodiments of the utility model, with reference to Figure 7 , the core diameter d1 of the head 200 is 7 mm, and the edge diameter d2 of the peripheral edge 220 is 10 mm.
[0059] In some embodiments of the utility model, with reference to Figure 1 , each end edge 210 is smoothly connected, and the common intersection of each end edge 210 is located on the preset axis 201.
[0060] It can be understood that, since each end edge 210 is smoothly connected, and the common intersection of each end edge 210 is located on the preset axis 201, the ball head milling cutter of the utility model can still maintain high precision and high service life when milling a small slope surface of 5° and above.
[0061] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.
Claims
1. A ball end mill, characterized in that, include: Handle; The head is connected to the handle. At one end of the head away from the handle, multiple end blades are formed. The multiple end blades are circumferentially spaced around a preset axis of the head. Along a direction away from the preset axis, each end blade includes a first cutting segment, a second cutting segment, and a third cutting segment connected in sequence. The first cutting segment has a first rake angle, the second cutting segment has a second rake angle, and the third cutting segment has a third rake angle. The first rake angle, the second rake angle, and the third rake angle are gradually increased in value.
2. A ball end mill according to claim 1, characterized in that, The first rake angle is -11° to -9°, the second rake angle is -7° to -5°, and the third rake angle is -4° to -2°.
3. A ball end mill according to claim 1, characterized in that, The end blade has a first rear angle and a second rear angle, the first rear angle being 8° to 12° and the second rear angle being 18° to 22°.
4. A ball end mill according to claim 1, characterized in that, The head is provided with a plurality of peripheral blades, which correspond one-to-one with the end blades in number and are connected to each other. A chip removal groove is formed between any two adjacent peripheral blades, and the helix angle of the chip removal groove is 30°. A tooth gap is formed between any two adjacent end blades, and the tooth gap corresponds one-to-one with and is connected to the chip removal groove.
5. A ball end mill according to claim 4, characterized in that, The peripheral cutting edge has a front angle and a rear arc angle, wherein the front angle is -7° to -5° and the rear arc angle is 7° to 9°.
6. A ball end mill according to claim 4, characterized in that, The blade width of the peripheral blade is 1.35mm.
7. A ball end mill according to claim 4, characterized in that, There are four sets of peripheral blades and end blades, each corresponding to the other.
8. A ball end mill according to claim 4, characterized in that, The core diameter of the head is 0.7 times the cutting diameter of the peripheral blade.
9. A ball end mill according to claim 8, characterized in that, The core diameter of the head is 7mm, and the core diameter of the peripheral blade is 10mm.
10. A ball end mill according to claim 1, characterized in that, Each of the end blades is smoothly connected, and the junction of each of the end blades is located on the preset axis.