Ball-end cutter

Abstract

The utility model discloses a ball-end cutter which comprises a cutter handle and a cutter head, the cutter head is arranged at one end of the cutter handle, a first ball blade, a second ball blade and a third ball blade which are circumferentially distributed around the axis of the cutter head at intervals are arranged on the cutter head, the curvature radius of the first ball blade is 5mm, and the second ball blade comprises a first blade part and a second blade part which are connected with each other. The curvature radius of the first blade part is 2.9 mm, the curvature radius of the second blade part is 3.5 mm, the curvature radius of the third ball blade is 3 mm, and on the same cross section of the tool bit, the distance from the first ball blade to the axis of the tool bit is a first distance, the distance from the second ball blade to the axis of the tool bit is a second distance, and the distance from the third ball blade to the axis of the tool bit is a third distance. The first distance and the second distance are opposite to each other, a first difference value is formed between the first distance and the second distance, a second difference value is formed between the first distance and the third distance, in each cross section of the tool bit, the maximum value between the first difference values is between 0.14 mm and 0.18 mm, and the maximum value between the second difference values is between 0.2 mm and 0.25 mm. The ball-end cutter is long in service life.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter technology, and in particular to a ball end mill. Background Technology

[0002] In the 3D surface machining of molds, due to the large roughing allowance in the previous process, the tool is subjected to severe wear in the previous process. As a result, when using a ball end mill for the final 3D surface machining, there are still large and uneven machining allowances. In some areas where other tools cannot be used for corner clearing, the machining allowance is equivalent to the roughing allowance. Therefore, when the ball end mill is used for the final 3D surface machining, it is very easy to have chipped cutting edges, ball end grinding, and other abnormal life phenomena. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a ball end mill with a longer service life.

[0004] A ball-end cutter according to an embodiment of the present invention includes a handle and a cutter head. The handle is used for clamping the ball-end cutter. The cutter head is disposed at one end of the handle and has a first ball-end blade, a second ball-end blade, and a third ball-end blade distributed circumferentially around the axis of the cutter head. The radius of curvature of the first ball-end blade is 5 mm. The second ball-end blade includes a first cutting portion and a second cutting portion connected to each other. The radius of curvature of the first cutting portion is 2.9 mm, the radius of curvature of the second cutting portion is 3.5 mm, and the radius of curvature of the third ball-end blade is 3 mm. On the same cross-section of the cutter head, the distance from the first ball-end blade to the axis of the cutter head is a first distance, the distance from the second ball-end blade to the axis of the cutter head is a second distance, and the distance from the third ball-end blade to the axis of the cutter head is a third distance. There is a first difference between the first distance and the second distance, and a second difference between the first distance and the third distance. In each cross-section of the cutter head, the maximum value between each first difference is between 0.14 mm and 0.18 mm, and the maximum value between each second difference is between 0.2 mm and 0.25 mm.

[0005] A ball-end cutter according to an embodiment of the present utility model has at least the following technical effects:

[0006] In a ball end mill of this application, the radius of curvature of the first ball end mill is set to 5mm, the second ball end mill is composed of a first cutting edge with a radius of curvature of 2.9mm and a cutting edge with a radius of curvature of 3.5mm, and the radius of curvature of the third ball end mill is set to 3mm. Furthermore, the difference in distance from the first and second ball end mills to the axis of the cutting head is between 0.14mm and 0.18mm, and the difference in distance from the first and second ball end mills to the axis of the cutting head is between 0.2mm and 0.25mm. When machining a workpiece with the ball end mill, the first ball end mill can perform rough machining, the second ball end mill can perform semi-finishing, and the third ball end mill can perform finishing. The allowance during cutting with the first, second, and third ball end mills is relatively uniform, resulting in smoother cutting and further extending the service life of the ball end mill.

[0007] According to some embodiments of the present invention, a ball-end cutter has a first ball-end blade with a first ball-end blade rear angle, the angle of which is between 10° and 15°.

[0008] According to some embodiments of the present invention, a ball-end cutter has a second ball-end blade with a second ball-end blade rear angle, the angle of which is between 10° and 15°.

[0009] According to some embodiments of the present invention, a ball-end cutter has a third ball blade having a first rear angle and a second rear angle, wherein the angle of the first rear angle is between 10° and 15°, and the angle of the second rear angle is between 28° and 35°.

[0010] According to some embodiments of the present invention, in a ball-end cutter, both the first and second ball-end blades adopt an S-shaped cutting edge.

[0011] According to some embodiments of the present invention, in a ball-end cutter, the third ball edge adopts a straight cutting edge.

[0012] According to some embodiments of the present invention, a ball-end cutter has a plurality of circumferential cutting edges arranged circumferentially around the axis of the cutter head. A first ball-end cutting edge, a second ball-end cutting edge, and a third ball-end cutting edge are respectively connected to a circumferential cutting edge. The circumferential cutting edge has a first rear angle and a second rear angle. The angle of the first rear angle is between 9° and 12°, and the angle of the second rear angle is between 25° and 30°.

[0013] According to some embodiments of the present invention, a ball-end cutter has a circumferential cutting edge with a circumferential cutting edge rake angle between 0° and 3°.

[0014] According to some embodiments of the present invention, a ball-end cutter has two first ball-end blades, two second ball-end blades, and two third ball-end blades. The two first ball-end blades are symmetrical about the axis of the cutter head, the two second ball-end blades are symmetrical about the axis of the cutter head, and the two third ball-end blades are symmetrical about the axis of the cutter head. Six circumferential cutting edges are provided.

[0015] According to some embodiments of the present invention, the diameter of the peripheral cutting edge is D, and the core diameter of the ball end mill is 0.7D.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a ball end mill according to one embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the cutter head in the diagram;

[0020] Figure 3 for Figure 2 A cross-sectional view of the cutting head in the middle;

[0021] Figure 4 for Figure 1 A cross-sectional view of the first ball edge in the middle;

[0022] Figure 5 for Figure 1 A cross-sectional view of the third ball edge in the image;

[0023] Figure 6 for Figure 1 A sectional view of the circumferential blade.

[0024] Figure label:

[0025] Handle 100;

[0026] Cutting head 200, first ball blade 210, second ball blade 220, first cutting edge 221, second cutting edge 222, third ball blade 230, peripheral blade 240;

[0027] First ball edge back angle a1;

[0028] The first rear corner b1 of the third ball blade and the second rear corner b2 of the third ball blade;

[0029] The first rear angle of the circumferential blade is c1, the second rear angle of the circumferential blade is c2, and the front angle of the circumferential blade is c3;

[0030] First distance d1, second distance d2, third distance d3. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] The following is for reference. Figures 1 to 6 A ball-end cutter according to an embodiment of the present utility model will be described in detail.

[0036] refer to Figures 1 to 3A ball-end cutter according to an embodiment of the present invention includes a handle 100 and a cutter head 200. The handle 100 is used for clamping the ball-end cutter. The cutter head 200 is disposed at one end of the handle 100. The cutter head 200 is provided with a first ball-end blade 210, a second ball-end blade 220, and a third ball-end blade 230 circumferentially spaced around the axis of the cutter head 200. The radius of curvature of the first ball-end blade 210 is 5 mm. The second ball-end blade 220 includes a first cutting edge 221 and a second cutting edge 222 connected to each other. The radius of curvature of the first cutting edge 221 is 2.9 mm, the radius of curvature of the second cutting edge 222 is 3.5 mm, and the radius of curvature of the third ball-end blade 230 is 3 mm. In the same cross-section of the cutter head 200, the distance from the first ball cutting edge 210 to the axis of the cutter head 200 is the first distance d1, the distance from the second ball cutting edge 220 to the axis of the cutter head 200 is the second distance d2, and the distance from the third ball cutting edge 230 to the axis of the cutter head 200 is the third distance d3. There is a first difference between the first distance d1 and the second distance d2, and there is a second difference between the first distance d1 and the third distance d3. In each cross-section of the cutter head 200, the maximum value between each first difference is between 0.14 mm and 0.18 mm, and the maximum value between each second difference is between 0.2 mm and 0.25 mm.

[0037] In a ball end mill of this application, the radius of curvature of the first ball edge 210 is set to 5mm, the second ball edge 220 is composed of a first cutting edge 221 with a radius of curvature of 2.9mm and a cutting edge with a radius of curvature of 3.5mm, and the radius of curvature of the third ball edge 230 is set to 3mm. Furthermore, the difference in distance from the first ball edge 210 and the second ball edge 220 to the axis of the cutter head 200 is between 0.14mm and 0.18mm. With a diameter between 0.2mm and 0.25mm, when machining a workpiece with a ball end mill, the first ball edge 210 can perform roughing, the second ball edge 220 can perform semi-finishing, and the third ball edge 230 can perform finishing. The cutting allowance of the first ball edge 210, the second ball edge 220, and the third ball edge 230 is relatively uniform, which makes cutting with the ball end mill more stable and further extends the service life of the ball end mill.

[0038] refer to Figure 1 and Figure 4 In some embodiments of this utility model, the first ball cutting edge 210 has a first ball cutting edge clearance angle α1, which is between 10° and 15°. It is understood that by setting the first ball cutting edge clearance angle α1 between 10° and 15°, when the roughing allowance is large, the first ball cutting edge 210 still possesses good rigidity and strength during rough machining of the workpiece, further improving the service life of the first ball cutting edge 210.

[0039] Preferably, the angle of the back angle a1 of the first ball edge is 13°.

[0040] refer to Figure 1 In some embodiments of this utility model, the second ball cutting edge 220 has a second ball cutting edge 220 back angle, the angle of which is between 10° and 15°. It is understood that by setting the angle of the second ball cutting edge 220 back angle between 10° and 15°, when the roughing allowance is large, the second ball cutting edge 220 still possesses good rigidity and strength when performing semi-finishing on the workpiece, further improving the service life of the second ball cutting edge 220.

[0041] Preferably, the rear angle of the second ball blade 220 is 13°.

[0042] In a specific embodiment of this utility model, the first ball blade 210 has a first ball blade 210 rake angle, the second ball blade 220 has a second ball blade 220 rake angle, and the third ball blade 230 has a third ball blade 230 rake angle. The angles of the first ball blade 210 rake angle, the second ball blade 220 rake angle, and the third ball blade 230 rake angle are all between 0° and 3°.

[0043] Preferably, the rake angles of the second ball edge 220 and the third ball edge 230 are both 2°.

[0044] refer to Figure 1 and Figure 5 In some embodiments of this utility model, the third ball cutting edge 230 has a first back angle b1 and a second back angle b2. The angle of the first back angle b1 is between 10° and 15°, and the angle of the second back angle b2 is between 28° and 35°. It is understood that by setting the angle of the first back angle b1 between 10° and 15° and the angle of the second back angle b2 between 28° and 35°, the sharpness of the third ball cutting edge 230 can be further improved, thereby ensuring the machining accuracy and quality of the third ball cutting edge 230 when performing finishing on the workpiece.

[0045] Preferably, the angle of the first rear angle of the third ball blade 230 is 12°, and the angle of the second rear angle of the third ball blade 230 is 31°.

[0046] refer to Figure 1 and Figure 2In some embodiments of this utility model, both the first ball cutting edge 210 and the second ball cutting edge 220 adopt an S-shaped cutting edge. It is understood that by designing the first ball cutting edge 210 as an S-shaped cutting edge, when the first ball cutting edge 210 is used for roughing workpieces with large roughing allowances, the cutting is smoother and the strength of the first ball cutting edge 210 is improved; similarly, by designing the second ball cutting edge 220 as an S-shaped cutting edge, when the second ball cutting edge 220 is used for semi-finishing workpieces with large roughing allowances, the cutting is smoother and the strength of the second ball cutting edge 220 is improved.

[0047] refer to Figure 1 and Figure 2 In some embodiments of this utility model, the third ball cutting edge 230 adopts a straight cutting edge. It can be understood that by setting the third ball cutting edge 230 to a straight cutting edge, the cutting performance of the third ball cutting edge 230 is improved, thereby further improving the accuracy and quality of the product processed by the third ball cutting edge 230 during the final finishing of the workpiece.

[0048] refer to Figure 1 and Figure 6 In some embodiments of this utility model, the cutting head 200 is provided with a plurality of peripheral cutting edges 240 circumferentially spaced around the axis of the cutting head 200. A first ball cutting edge 210, a second ball cutting edge 220, and a third ball cutting edge 230 are respectively connected to a peripheral cutting edge 240. Each peripheral cutting edge 240 has a first clearance angle c1 and a second clearance angle c2. The angle of the first clearance angle c1 is between 9° and 12°, and the angle of the second clearance angle c2 is between 25° and 30°. It is understood that by setting the first clearance angle c1 between 9° and 12°, the chipping resistance and wear resistance of the peripheral cutting edge 240 during rough machining can be improved, greatly reducing the increase in cutting force and heat generation caused by chipping of the peripheral cutting edge 240, significantly reducing the risk of ball end mill breakage, and thus improving the service life of the ball end mill.

[0049] Preferably, the angle of the first rear angle of the peripheral blade 240 is 11°, and the angle of the second rear angle of the peripheral blade 240 is 27°.

[0050] like Figure 1 and Figure 6 As shown, in some embodiments, the peripheral cutting edge 240 has a peripheral cutting edge rake angle c3, which is between 0° and 3°. It is understood that by setting the peripheral cutting edge rake angle c3 between 0° and 3°, the ball end mill of this application can meet the machining performance requirements for most materials, exhibiting good versatility.

[0051] Preferably, the angle of the peripheral cutting edge rake angle c3 is 2°.

[0052] like Figure 1 and Figure 2 As shown, in one embodiment, the cutter head 200 is provided with two first ball cutting edges 210, two second ball cutting edges 220, and two third ball cutting edges 230. The two first ball cutting edges 210 are symmetrical about the axis of the cutter head 200, the two second ball cutting edges 220 are symmetrical about the axis of the cutter head 200, and the two third ball cutting edges 230 are symmetrical about the axis of the cutter head 200. Six peripheral cutting edges 240 are provided. It can be understood that by setting the first ball cutting edges 210, the second ball cutting edges 220, and the third ball cutting edges 230 in two groups, and ensuring that the two groups of first ball cutting edges 210, second ball cutting edges 220, and third ball cutting edges 230 are symmetrical about the axis of the cutter head 200, the feed per tooth of the ball end mill can be further increased, thereby improving the machining efficiency of the ball end mill.

[0053] like Figure 3 As shown, in some embodiments, the cutting diameter of the peripheral cutting edge 240 is D, and the core diameter of the ball end mill is 0.7D. It can be understood that setting the core diameter of the ball end mill to 0.7D enables the ball end mill to maintain good rigidity even with uneven allowance and large feed.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A ball-end cutter, characterized in that, include: The handle is used for mounting ball-end cutters; A cutting head is disposed at one end of the handle. The cutting head has a first ball-shaped cutting edge, a second ball-shaped cutting edge, and a third ball-shaped cutting edge distributed circumferentially around the cutting head. The radius of curvature of the first ball-shaped cutting edge is 5 mm. The second ball-shaped cutting edge includes a first cutting portion and a second cutting portion connected to each other. The radius of curvature of the first cutting portion is 2.9 mm, the radius of curvature of the second cutting portion is 3.5 mm, and the radius of curvature of the third ball-shaped cutting edge is 3 mm. On the same cross-section of the cutting head, the distance from the first ball-shaped cutting edge to the axis of the cutting head is a first distance, the distance from the second ball-shaped cutting edge to the axis of the cutting head is a second distance, and the distance from the third ball-shaped cutting edge to the axis of the cutting head is a third distance. There is a first difference between the first distance and the second distance, and there is a second difference between the first distance and the third distance. In each cross-section of the cutting head, the maximum value of each of the first differences is between 0.14 mm and 0.18 mm, and the maximum value of each of the second differences is between 0.2 mm and 0.25 mm.

2. The ball-end cutter according to claim 1, characterized in that, The first ball blade has a first ball blade back angle, the angle of which is between 10° and 15°.

3. The ball-end cutter according to claim 1, characterized in that, The second ball blade has a second ball blade back angle, the angle of which is between 10° and 15°.

4. A ball-end cutter according to claim 1, characterized in that, The third ball blade has a first rear angle and a second rear angle, the angle of the first rear angle being between 10° and 15°, and the angle of the second rear angle being between 28° and 35°.

5. A ball-end cutter according to claim 1, characterized in that, Both the first and second ball-shaped cutting edges have an S-shaped cutting edge.

6. A ball-end cutter according to claim 1, characterized in that, The third ball-shaped cutting edge has a straight cutting edge.

7. A ball-end cutter according to claim 1, characterized in that, The cutting head is provided with a plurality of circumferential cutting edges spaced around the axis of the cutting head. The first ball cutting edge, the second ball cutting edge and the third ball cutting edge are respectively connected to a circumferential cutting edge. The circumferential cutting edge has a first rear angle and a second rear angle. The angle of the first rear angle is between 9° and 12°, and the angle of the second rear angle is between 25° and 30°.

8. A ball-end cutter according to claim 7, characterized in that, The peripheral cutting edge has a peripheral cutting edge rake angle, the angle of which is between 0° and 3°.

9. A ball-end cutter according to claim 7 or 8, characterized in that, The cutter head is provided with two first ball blades, two second ball blades and two third ball blades. The two first ball blades are symmetrical about the axis of the cutter head, the two second ball blades are symmetrical about the axis of the cutter head, and the two third ball blades are symmetrical about the axis of the cutter head. There are 6 circumferential blades.

10. A ball-end cutter according to claim 7, characterized in that, The diameter of the peripheral cutting edge is D, and the core diameter of the ball end mill is 0.7D.

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