CN214236452U

CN214236452U - Tapered ball end mill

Info

Publication number: CN214236452U
Application number: CN202120098134.7U
Authority: CN
Inventors: 谢叶飞
Original assignee: Astor Precision Tools Shanghai Co ltd
Current assignee: Astor Precision Tools Shanghai Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-09-21
Anticipated expiration: 2031-01-14

Abstract

The utility model discloses a take tapering ball end milling cutter, including the cutter main part, the cutter main part is including cutting portion, neck and the stalk portion that connects gradually, the cutting portion is provided with circumference spiral sword, be provided with the chip groove between the circumference spiral sword, be provided with the end sword on the spherical terminal surface of cutting portion, the end sword is connected with circumference spiral sword in the same direction as the water, the end sword is equipped with end sword rake face and end sword back knife face, circumference spiral sword is equipped with spiral sword back knife face, the neck is provided with the tapering. The utility model is provided with a tapered neck part, which ensures the rigidity of the cutter and simultaneously reduces the size of the head part, and is convenient to extend into a narrow space for processing; the front angle and the rear angle are reasonably designed, the rigidity of the milling cutter is ensured, the sharpness of the milling cutter is increased, and the possibility of burr generation in the milling process is effectively reduced; the chip groove is arranged and smoothly connected with the chip groove, so that chips can be smoothly discharged, the processing effect is ensured, and the service life is prolonged.

Description

Tapered ball end mill

Technical Field

The utility model relates to a processing cutter especially relates to a take tapered ball end milling cutter.

Background

In the modern industrial machining industry, the application of nickel alloy is more and more extensive, in particular to the aerospace and automobile industry of high-added-value precision machining.

The integral pressure wheel is a core component of a turbine engine and a turbocharged engine, and the processing means, the processing precision and the processing surface quality of the molded surface of the pressure wheel directly influence the aerodynamic performance and the mechanical efficiency of the engine and have decisive influence on the performance of the engine. The integral impeller becomes a typical part difficult to machine due to the complexity of the curved surface and high machining precision, and the integral impeller is usually made of nickel alloy materials at present.

In order to enable the pressure wheel to meet the requirement of aerodynamics, the blade is usually in a structure with a large torsion angle and a root part becoming round, and the structure puts higher requirements on the processing of the pressure wheel. The pressure wheel blade must have good surface quality, the precision is generally concentrated on the surface of the blade and the surface of the blade root, and the surface roughness value is smaller than Ra0.8um.

At present, the pressure wheel finish machining blade usually adopts the ball-end milling cutter, can have following defect: firstly, the method comprises the following steps: the entrance of the pressure wheel blade root is a narrow semi-closed space, and a milling cutter with a smaller ball head diameter needs to be selected to extend into the narrow space for processing during processing, so that the diameter of the cutter is smaller, the rigidity is poorer, and vibration lines are easy to generate under the high-speed milling action to influence the surface roughness of the pressure wheel; secondly, the method comprises the following steps: the front and back angles of the ball-end milling cutter are too small, the cutting edge is not sharp enough, and the extrusion is generated in the milling process, so that burrs are generated at the inlet and the outlet of the blade, and if the burr is removed in the subsequent adding process, the processing efficiency is influenced; thirdly, the method comprises the following steps: the inlet of the pressure wheel blade root is a narrow semi-closed space, so that the unsmooth chip removal is often caused in the milling process, and the service life is influenced. Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a tapered ball end mill is provided, solve current ball end mill and locate the unsatisfactory problem of processing effect in narrow and small space.

The utility model discloses a solve above-mentioned technical problem and the technical scheme who adopts provides a take tapered ball end milling cutter, including the cutter main part, the cutter main part is including the cutting portion, neck and the stalk portion that connect gradually, the cutting portion is provided with circumference spiral sword, be provided with the chip groove between the circumference spiral sword, be provided with the end sword on the spherical terminal surface of cutting portion, the end sword is connected with circumference spiral sword in the same direction as smooth, the end sword is equipped with end sword rake face and end sword back knife face, circumference spiral sword is equipped with spiral sword back knife face, the neck is provided with the tapering.

Further, the circumferential spiral blades and the chip grooves are symmetrically distributed about the axial center of the tool body, the end blades are symmetrically distributed about the axial center of the tool body, and the end blades are converged at the axial center of the front end of the cutting portion.

Further, the end edge rake face is in contact with a machined part and has an end edge rake angle which is 6-10 degrees; the end edge rear cutter surface is in contact with a workpiece and has an end edge rear angle which is 9-12 degrees; the spiral blade rear tool surface is in contact with a workpiece and has a spiral blade rear angle which is 25-30 degrees.

Further, the end edge rake face and the adjacent end edge rear rake face form a chip groove, the chip groove is communicated with the chip groove, and the end edge rake face is smoothly connected with the arc-shaped groove wall of the chip groove.

Further, the taper of the neck portion is 2-4 degrees.

Further, the helix angle of the chip groove is 30-35 degrees.

Further, the outer surface of the cutting portion is provided with a coating.

Furthermore, the material of the cutter main body is a hard alloy bar with Co content of 5% -8% and granularity of 0.2 um-0.4 um.

The utility model discloses contrast prior art has following beneficial effect: the tapered ball end mill provided by the utility model is provided with the tapered neck part, thereby ensuring the rigidity of the cutter and simultaneously reducing the size of the head part, and being convenient for extending into a narrow space for processing; the front angle and the rear angle are reasonably designed, the rigidity of the milling cutter is ensured, the sharpness of the milling cutter is increased, and the possibility of burr generation in the milling process is effectively reduced; the chip groove is arranged and smoothly connected with the chip groove, so that chips can be smoothly discharged, the processing effect is ensured, and the service life is prolonged.

Drawings

Fig. 1 is a schematic structural view of a tapered ball end mill according to an embodiment of the present invention;

fig. 2 is an enlarged view of a cutting portion of a tapered ball end mill according to an embodiment of the present invention.

In the figure:

1. a handle; 2. a neck portion; 3. a cutting portion; 4. a circumferential helical blade; 5. a chip groove; 6. an end blade; 7. an end blade rake surface; 8. an end blade flank; 9. spiral blade flank face.

Detailed Description

The invention is further described with reference to the following figures and examples.

Fig. 1 is a schematic structural view of a tapered ball end mill according to an embodiment of the present invention; fig. 2 is an enlarged view of a cutting portion of a tapered ball end mill according to an embodiment of the present invention.

Please refer to fig. 1 and 2, the tapered ball end mill of the embodiment of the present invention includes a tool body, the tool body includes a cutting portion 3, a neck portion 2 and a handle portion 1 connected in sequence, the cutting portion 3 is provided with a circumferential spiral blade 4, a chip groove 5 is provided between the circumferential spiral blades 4, an end blade 6 is provided on the spherical end surface of the cutting portion 3, the end blade 6 is connected with the circumferential spiral blade 4 in a smooth manner, the end blade 6 is provided with an end blade front knife face 7 and an end blade rear knife face 8, the circumferential spiral blade 4 is provided with a spiral blade rear knife face 9, and the neck portion 2 is provided with a taper. The circumferential spiral blades 4 and the chip grooves 5 are symmetrically distributed about the axial center of the tool body, the end blades 6 are symmetrically distributed about the axial center of the tool body, and the end blades 6 are converged at the axial center of the front end of the cutting portion 3.

Specifically, the radius of the spherical end face of the cutting part 3 is 1-4 mm; the length of the cutting part 3 is determined according to the depth of the pressure wheel blade to be processed, and is generally 3-5 mm longer than the depth of the blade. The taper of the neck part 2 is 2-4 degrees, so that the handle part 1 can be prevented from interfering the pressure wheel during processing, and the rigidity of the cutter is increased and ensured.

With continued reference to fig. 2, in the tapered ball end mill according to the embodiment of the present invention, the end edge rake face 7 contacts with the workpiece and has an end edge rake angle, and the end edge rake angle is 6 to 10 degrees; the large-angle end edge front angle increases the sharpness of the end edge; the end edge rear cutter face 8 is in contact with a workpiece and has an end edge rear angle which is 9-12 degrees; the spiral blade rear cutter surface 9 is in contact with a workpiece and has a spiral blade rear angle which is 25-30 degrees; due to the reasonable design of the front angle and the rear angle, the rigidity of the milling cutter is ensured, the sharpness of the milling cutter is increased, and the possibility of burr generation in the milling process is effectively reduced.

Specifically, a chip flute is formed by the end edge front cutter face 7 and the adjacent end edge rear cutter face 8, the chip flute is communicated with the chip flute 5, and the end edge front cutter face 7 is smoothly connected with the arc-shaped groove wall of the chip flute 5; the spiral angle of the chip groove 5 is 30-35 degrees, and smooth chip removal is guaranteed.

Preferably, the outer surface of the cutting portion 3 is provided with a coating. The coating is a Si-based coating which can resist the high temperature of 1100 ℃, and simultaneously, the nano-scale composite coating and special Si are adopted₃N₄The matrix structure greatly enhances the wear resistance of the coating.

Preferably, the material of the cutter main body is a hard alloy bar with Co content of 5% -8% and granularity of 0.2-0.4 um.

To sum up, the tapered ball end mill of the embodiment of the present invention is provided with the tapered neck portion 2, so as to reduce the size of the head portion while ensuring the rigidity of the tool, and facilitate the tool to be inserted into a narrow space for processing; the front angle and the rear angle are reasonably designed, the rigidity of the milling cutter is ensured, the sharpness of the milling cutter is increased, and the possibility of burr generation in the milling process is effectively reduced; the chip grooves are arranged and smoothly connected with the chip grooves 5, so that chips can be smoothly discharged, the processing effect is ensured, and the service life is prolonged.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a take tapering ball end milling cutter, a serial communication port, including cutter main body, cutter main body is including cutting portion, neck and the stalk portion that connects gradually, cutting portion is provided with circumference spiral sword, be provided with the chip groove between the circumference spiral sword, be provided with the end sword on the spherical terminal surface of cutting portion, the end sword is connected with circumference spiral sword in the same direction as sliding, the end sword is equipped with end sword rake face and end sword back knife face, circumference spiral sword is equipped with spiral sword back knife face, the neck is provided with the tapering.

2. The tapered ball nose mill according to claim 1, wherein the circumferential helical edges and the flutes are symmetrically distributed about an axial center of the tool body, and the end edges are symmetrically distributed about an axial center of the tool body, the end edges converging at a cutting portion leading end axial center.

3. The tapered ball nose mill of claim 1, wherein the end edge rake surface in contact with the workpiece has an end edge rake angle of 6 ° to 10 °; the end edge rear cutter surface is in contact with a workpiece and has an end edge rear angle which is 9-12 degrees; the spiral blade rear tool surface is in contact with a workpiece and has a spiral blade rear angle which is 25-30 degrees.

4. The tapered ball nose mill according to claim 1, wherein the end edge rake face and the adjacent end edge flank face form a chip flute, the chip flute communicates with the chip flute, and the end edge rake face and the groove wall of the chip flute are smoothly connected in an arc shape.

5. The tapered ball nose mill of claim 1, wherein the taper of the neck portion is between 2 ° and 4 °.

6. The tapered ball nose mill of claim 1, wherein the flute helix angle is 30 ° to 35 °.

7. The tapered ball nose mill of claim 1, wherein the cutting portion outer surface is provided with a coating.

8. The tapered ball nose mill of claim 1, wherein the tool body is made of a hard alloy bar having a Co content of 5% to 8% and a particle size of 0.2um to 0.4 um.