Profiling ball cutter

Abstract

The profiling ball cutter comprises a handle part and a cutting part, the edge diameter of the cutting part is increased and then decreased from the end away from the handle part to the end close to the handle part, the cutting part comprises a circumferential edge part and a ball head part which are sequentially connected to one end of the handle part, and the circumferential edge part is provided with four circumferential edges; the ball head part is provided with four-edge ball head edges, the four-edge ball head edges are respectively connected with four peripheral edges, the correspondingly connected ball head edges and peripheral edges are spirally wound on the cutting part in an S shape from one end far away from the handle part to one end close to the handle part, and the curvature of the ball head edges is gradually increased and then gradually reduced from one end far away from the handle part to one end close to the handle part. The profiling ball cutter provided by the utility model has good cutting performance and also has good wear resistance.

Description

Technical Field

[0001] The present application relates to the technical field of cutting tools, and in particular to a contoured ball cutter. Background Art

[0002] In the related art, a common ball-end tool includes a ball-end blade and a peripheral blade connected along the axis of the handle, and the curvature radius of the ball-end blade remains unchanged from the end away from the peripheral blade to the end connected to the peripheral blade. However, this ball-end blade is easily damaged and has insufficient strength, which affects the service life of the tool and the surface processing quality of the product, bringing adverse effects to the company's reputation. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a profiling ball cutter, which can ensure that the cutter maintains good cutting performance during use and also has good wear resistance.

[0004] The contoured ball cutter according to the first aspect of the utility model comprises: a handle and a cutting portion, wherein the blade diameter of the cutting portion increases first and then decreases from an end away from the handle to an end close to the handle, and the cutting portion comprises a peripheral blade portion and a ball head portion sequentially connected to one end of the handle, wherein the peripheral blade portion is provided with a four-edged peripheral blade; the ball head portion is provided with a four-edged ball head blade, and the four-edged ball head blade is respectively connected to the four-edged peripheral blade, and the correspondingly connected ball head blades and peripheral blades are spirally wound around the cutting portion in an S shape from an end away from the handle to an end close to the handle, and the curvature of the ball head blade gradually increases first and then gradually decreases from an end away from the handle to an end close to the handle.

[0005] The profiling ball cutter according to the embodiment of the utility model has at least the following beneficial effects: the profiling ball cutter comprises a handle and a cutting portion, the blade diameter of the cutting portion increases first and then decreases from the end away from the handle to the end close to the handle, so that the outer diameter of the groove of the processed product also gradually increases from the bottom of the groove; the cutting portion comprises a peripheral blade portion and a ball head portion sequentially connected to one end of the handle, the peripheral blade portion is provided with four spirally wound peripheral blades, the ball head portion is provided with a ball head blade with four blades spirally wound on the end of the cutting portion away from the handle, the four ball head blades are respectively connected to the four peripheral blades, and the curvature of the four ball head blades increases first and then decreases from the end away from the handle to the end close to the handle The blade length of the ball head blade in the middle part along the axis of the shank is reduced, so that the blade length of the ball head blade in the middle part along the axis of the shank can be relatively long, thereby reducing the cutting force of this arc segment, reducing the wear degree of the ball head blade, and increasing the service life of the tool; at the same time, the curvature of the ball head blade away from the shank is relatively small, avoiding excessive resistance when cutting at the end of the ball head blade away from the shank, thereby improving the wear resistance of the end of the ball head blade away from the shank; the curvature of the ball head blade close to the shank is relatively small, which can also reduce the wear caused by excessive linear speed at the end of the ball head blade close to the shank; therefore, the contoured ball cutter of the present application has good sharpness as well as good rigidity and strength as a whole, thereby improving the processing efficiency and service life of the tool.

[0006] According to some embodiments of the present invention, the front angle of the four-edged ball-end cutting edge first increases, then decreases, and then increases again from an end away from the shank to an end close to the shank.

[0007] According to some embodiments of the utility model, the ball-end cutting edge includes a first section, a second section and a third section in sequence from an end away from the handle to an end close to the handle, the rake angle of the first section gradually changes from 0 to -3° from the end away from the handle to the end close to the handle, the rake angle of the second section gradually changes from -3° to 6° from the end away from the handle to the end close to the handle, and the rake angle of the third section gradually changes from 6° to -3° from the end away from the handle to the end close to the handle.

[0008] According to some embodiments of the present invention, the ball-end blade includes two short blades and two long blades, the two long blades are connected and separate the two short blades, and the curvatures of the long blades and the short blades at points on the same axial section are different.

[0009] According to some embodiments of the present invention, the curvature of the long blade from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 3mm^-1, and then gradually decreases to 1 / 4mm^-1; the curvature of the short blade from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 2mm^-1, and then gradually decreases to 1 / 4mm^-1.

[0010] According to some embodiments of the present invention, a chip removal groove is formed between adjacent peripheral edges, a first tooth gap is formed between adjacent ball-end edges, and a second tooth gap is formed between the connecting portion of the two long edges and the two short edges respectively.

[0011] According to some embodiments of the present invention, the helix angle of the peripheral edge gradually increases from an end away from the shank to an end close to the shank.

[0012] According to some embodiments of the utility model, the ball-end cutting edge is provided with a first clearance angle surface and a second clearance angle surface arranged in sequence, the first clearance angle α is 12°, and the second clearance angle β is 18°.

[0013] According to some embodiments of the utility model, the peripheral blade is provided with a third clearance angle surface and a fourth clearance angle surface which are arranged in sequence to avoid air gaps. The third clearance angle is 12° and the fourth clearance angle is 28°.

[0014] According to some embodiments of the present invention, the helix angle of the peripheral blade gradually increases from 25° to 35° from the end away from the shank to the end close to the shank, and the value range of the peripheral blade rake angle is 3°~4°.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the contour ball cutter of the utility model;

[0018] Figure 2 for Figure 1 A left side view of the contoured ball cutter shown in;

[0019] Figure 3 for Figure 1 A schematic diagram of the local structure of the peripheral blade section of the contoured ball cutter shown in ;

[0020] Figure 4 for Figure 1 Schematic diagram of the local structure of the ball head cutting edge section in the contoured ball cutter shown in.

[0021] Reference numerals:

[0022] Shank 100; cutting portion 200; peripheral edge 211; chip groove 212; third clearance angle surface 213; fourth clearance angle surface 214; ball-end edge 221; long edge 2211; short edge 2212; first tooth gap 222; second tooth gap 223; first clearance angle surface 224; second clearance angle surface 225. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0027] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0028] Reference below Figures 1 to 4 The utility model is described in detail.

[0029] like Figure 1 to Figure 2As shown, the contoured ball cutter according to the embodiment of the utility model includes: a handle 100 and a cutting part 200, the blade diameter of the cutting part 200 first increases and then decreases from the end away from the handle 100 to the end close to the handle 100, the cutting part 200 includes a peripheral blade part and a ball head part which are sequentially connected to one end of the handle 100, the peripheral blade part is provided with a four-edged peripheral blade 211; the ball head part is provided with a four-edged ball head blade 221, the four-edged ball head blade 221 is respectively connected to the four-edged peripheral blade 211, the correspondingly connected ball head blade 221 and the peripheral blade 211 are spirally wound around the cutting part 200 in an S shape from the end away from the handle 100 to the end close to the handle 100, and the curvature of the ball head blade 221 first gradually increases and then gradually decreases from the end away from the handle 100 to the end close to the handle 100.

[0030] It can be understood that this contoured ball cutter includes a handle 100 and a cutting part 200, and the blade diameter of the cutting part 200 first increases and then decreases from the end away from the handle 100 to the end close to the handle 100, so that the outer diameter of the shape of the groove of the processed product also gradually increases from the bottom of the groove; the cutting part 200 includes a peripheral blade part and a ball head part sequentially connected to one end of the handle 100, the peripheral blade part is provided with four spirally wound peripheral blades 211, and the ball head part is provided with a ball head blade 221 with four blades spirally wound at the end of the cutting part 200 away from the handle 100, the four ball head blades 221 are respectively connected to the four peripheral blades 211, and the curvature of the four ball head blades 221 first increases and then decreases from the end away from the handle 100 to the end close to the handle 100, from The blade length of the middle part of the ball-end blade 221 along the axis of the shank is relatively long, thereby reducing the cutting force of this arc segment, reducing the wear degree of the ball-end blade 221, and improving the service life of the tool; at the same time, the curvature of a section of the ball-end blade 221 away from the shank 100 is relatively small, avoiding excessive resistance during cutting at the end of the ball-end blade 221 away from the shank 100, thereby improving the wear resistance of the end of the ball-end blade 221 away from the shank 100; the curvature of a section of the ball-end blade 221 close to the shank 100 is relatively small, which can also reduce the wear caused by excessive linear speed at the end of the ball-end blade 221 close to the shank 100; therefore, the contoured ball cutter of the present application has good sharpness as well as good rigidity and strength as a whole, thereby improving the processing efficiency and service life of the tool.

[0031] It can be understood that the front angle of the four-edge ball-end cutting edge 221 increases first, then decreases, and then increases again from the end away from the shank 100 to the end close to the shank 100. Figure 1 to Figure 2As shown, in the present embodiment, the front angle γ of the ball-end cutting edge 221 from the end away from the shank 100 to the end close to the shank 100 can be roughly divided into three sections, namely, from the end away from the shank 100 to the end close to the shank 100, there is a first section with a thicker front angle surface, a second section with a thinner front angle surface, and a third section with a thicker front angle surface. Since the end of the ball-end cutting edge 221 away from the shank 100 is prone to wear, the first section can have better strength by thickening the front angle surface, and the strength of the second section is generally greater, so the cutting force of the second section is increased by the thin front angle surface to increase its sharpness; the third section is close to the peripheral blade 211, so the linear speed during rotational cutting will be greater and the wear will be faster, so the strength of the third section can be improved by increasing the wall thickness of the third section.

[0032] It can be understood that the ball-end cutting edge 221 includes a first section, a second section and a third section from the end away from the handle 100 to the end close to the handle 100, the first section has a rake angle gradually changing from 0 to -3° from the end away from the handle 100 to the end close to the handle 100, the second section has a rake angle gradually changing from -3° to 6° from the end away from the handle 100 to the end close to the handle 100, and the third section has a rake angle gradually changing from 6° to -3° from the end away from the handle 100 to the end close to the handle 100. For example, Figure 1 to Figure 2 As shown, in the present embodiment, the ball-end cutting edge 221 includes a first section, a second section and a third section connected in sequence from the end away from the shank 100 to the end close to the shank 100. The front angle of the first section ball-end cutting edge 221 gradually changes from 0 to -3° from the end away from the shank 100 to the end close to the shank 100, and the breakage of the end of the ball-end cutting edge 221 away from the shank 100 is suppressed by the thicker front cutting edge surface; the front angle of the second section ball-end cutting edge 221 gradually changes from -3° to 6°, and the thin front cutting edge surface increases the sharpness of the cutting; finally, the front angle of the third section ball-end cutting edge 221 gradually changes from 6° to -3°, which can suppress the degree of tool rolling caused by excessive linear speed.

[0033] It can be understood that the ball-end blade 221 includes two short blades 2212 and two long blades 2211, the two long blades 2211 are connected and separate the two short blades 2212, and the long blades 2211 and the short blades 2212 have different curvatures at points on the same axial section. Figure 1 to Figure 2 As shown, in this embodiment, the curvatures of the long edge and the short edge on the same axial section are different, so that the resonance during cutting can be reduced through this structure, thereby improving the surface processing quality of the workpiece.

[0034] It can be understood that the curvature of the long edge 2211 from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 3mm^-1, and then gradually decreases to 1 / 4mm^-1, and the curvature of the short edge 2212 from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 2mm^-1, and then gradually decreases to 1 / 4mm^-1. Figure 2 As shown, in this embodiment, the curvature of the long edge 2211 changes faster from the end away from the handle to the end close to the handle than the short edge, thereby increasing the difference in curvature between the long edge 2211 and the short edge 2212 on the same axial section, thereby greatly reducing the degree of resonance. That is, except for the two ends of the long edge and the two ends of the short edge, the curvature of the long edge and the short edge at the same axial section is different.

[0035] It can be understood that a chip removal groove 212 is formed between adjacent peripheral edges 211, a first tooth gap 222 is formed between adjacent ball-end edges 221, and a second tooth gap 223 is formed between the connection between the two long edges 2211 and the two short edges 2212. Figure 1 to Figure 2 As shown, in this embodiment, a second tooth gap 223 is set between the connection of the two long edges 2211 and the short edge 2212, so that the waste chips generated during cutting can be discharged along the second tooth gap 223, the first tooth gap 222 and the chip groove 212 in sequence, avoiding the waste chips falling to the bottom and affecting subsequent processing.

[0036] It can be understood that the helix angle of the peripheral edge 211 gradually increases from the end away from the handle 100 to the end close to the handle 100. Figure 1 As shown, in this embodiment, the helix angle of the peripheral edge 211 gradually increases from the end away from the shank 100 to the end close to the shank 100, thereby improving the overall cutting sharpness and chip removal capability.

[0037] It should be understood that the core diameter of the ball cutter in the present application is 0.53D, that is, the core diameter is 53% of the outer diameter.

[0038] It can be understood that the ball-end cutting edge 221 is provided with a first clearance angle surface 224 and a second clearance angle surface 225 arranged in sequence, the first clearance angle α is 12°, and the second clearance angle β is 18°. Figure 4 As shown, in this embodiment, the first back angle surface 224 and the second back angle surface 225 are arranged in sequence to avoid air gaps through the ball-end cutting edge 221, thereby improving the sharpness of the ball-end cutting edge 221 and thus improving the cutting strength of the ball-end cutting edge 221; specifically, the first back angle and the second back angle corresponding to the first back angle surface 224 and the second back angle surface 225 are 12 degrees and 18 degrees, respectively.

[0039] It can be understood that the peripheral blade 211 is provided with a third clearance angle surface 213 and a fourth clearance angle surface 214 arranged in sequence, the third clearance angle is 12°, and the fourth clearance angle is 28°. Figure 3 As shown, in this embodiment, by providing a third back angle surface 213 and a fourth back angle surface 214 on the peripheral blade 211, the sharpness and cutting strength of the peripheral blade 211 can be improved; specifically, the third back angle a corresponding to the third back angle surface 213 is 12 degrees, and the fourth back angle b corresponding to the fourth back angle surface 214 is 28 degrees.

[0040] It can be understood that the helix angle of the peripheral blade 211 gradually increases from 25° to 35° from the end away from the handle 100 to the end close to the handle 100, and the value range of the front angle of the peripheral blade 211 is 3° to 4°. Figure 3 As shown, in this embodiment, the helix angle of the peripheral blade 211 gradually increases from front to back, and the value range of the front angle c of the peripheral blade 211 is the more common 3~4°, so that the peripheral blade 211 has good sharpness and the smaller helix angle structure has good overall rigidity and strength, and also has good chip removal performance, reducing the time that chips stay in the chip groove 212 and reducing heat generation.

[0041] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. The profiling ball cutter is characterized by: include: handle (100); A cutting portion (200), wherein the blade diameter of the cutting portion (200) increases first and then decreases from an end away from the shank (100) to an end close to the shank (100), the cutting portion (200) comprises a peripheral blade portion and a ball head portion sequentially connected to one end of the shank (100), the peripheral blade portion is provided with a four-edged peripheral blade (211); the ball head portion is provided with a four-edged ball head blade (221), the four-edged ball head blade (221) is respectively connected to the four-edged peripheral blade (211), the correspondingly connected ball head blade (221) and the peripheral blade (211) are spirally wound around the cutting portion (200) in an S shape from an end away from the shank (100) to an end close to the shank (100), and the curvature of the ball head blade (221) increases first and then gradually decreases from an end away from the shank (100) to an end close to the shank (100).

2. The contoured ball cutter according to claim 1, characterized in that: The front angle of the ball-end cutting edge (221) of the four-edged blade first increases, then decreases, and then increases again from an end away from the shank (100) to an end close to the shank (100).

3. The contoured ball cutter according to claim 1, characterized in that: The ball-end cutting edge (221) includes a first section, a second section and a third section in sequence from an end away from the shank (100) to an end close to the shank (100); the first section has a rake angle gradually changing from 0 to -3° from an end away from the shank (100) to an end close to the shank (100); the second section has a rake angle gradually changing from -3° to 6° from an end away from the shank (100) to an end close to the shank (100); and the third section has a rake angle gradually changing from 6° to -3° from an end away from the shank (100) to an end close to the shank (100).

4. The contoured ball cutter according to claim 1, characterized in that: The ball-end blade (221) comprises two short blades (2212) and two long blades (2211), the two long blades (2211) are connected and separate the two short blades (2212), and the long blades (2211) and the short blades (2212) have different curvatures at points on the same axial section.

5. The contoured ball cutter according to claim 4, characterized in that: The curvature of the long blade (2211) from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 3mm^-1, and then gradually decreases to 1 / 4mm^-1; the curvature of the short blade (2212) from the end away from the handle to the end close to the handle first gradually increases from 1 / 5mm^-1 to 1 / 2mm^-1, and then gradually decreases to 1 / 4mm^-1.

6. The contoured ball cutter according to claim 4, characterized in that: A chip removal groove (212) is formed between adjacent peripheral cutting edges (211), a first tooth gap (222) is formed between adjacent ball-end cutting edges (221), and a second tooth gap (223) is formed between the connecting portion of the two long cutting edges (2211) and the two short cutting edges (2212).

7. The contoured ball cutter according to claim 1, characterized in that: The helix angle of the peripheral edge (211) gradually increases from an end away from the shank (100) to an end close to the shank (100).

8. The contoured ball cutter according to claim 1, characterized in that: The ball-end cutting edge (221) is provided with a first back angle surface (224) and a second back angle surface (225) which are arranged in sequence to avoid air gaps; the first back angle is 12°, and the second back angle is 18°.

9. The contoured ball cutter according to claim 1, characterized in that: The peripheral blade (211) is provided with a third rear angle surface (213) and a fourth rear angle surface (214) which are arranged in sequence to avoid air gaps; the third rear angle is 12°, and the fourth rear angle is 28°.

10. The contoured ball cutter according to claim 7, characterized in that: The helix angle of the peripheral blade (211) gradually increases from 25° to 35° from an end away from the shank (100) to an end close to the shank (100), and the rake angle of the peripheral blade (211) ranges from 3° to 4°.

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