CN217095870U

CN217095870U - Milling cutter with spiral cooling hole

Info

Publication number: CN217095870U
Application number: CN202220582542.4U
Authority: CN
Inventors: 黄启君; 张预分
Original assignee: Kunshan Changying Hard Material Technology Co ltd
Current assignee: Kunshan Changying Hard Material Technology Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-08-02
Anticipated expiration: 2032-03-17

Abstract

The utility model discloses a take milling cutter in spiral cooling hole belongs to cutting tool technical field. The end face of the milling cutter is provided with corresponding end face edges which have the same number as the spiral cutting edges, and the tail ends of the spiral cutting edges are connected with the corresponding end face edges through RQ arc sections along the spiral direction; the inner part of the milling cutter is axially provided with through spiral holes with the same number and lead as the spiral cutting edges; an inwards concave liquid separating groove is formed on the end surface of the cutter handle part; one end of each through spiral hole is opened in the liquid dividing groove, and the other end of each through spiral hole is opened at the rear corner of the end face blade of the upper end face blade of the cutting part. The milling cutter has the advantages of uniform and sufficient cooling in the cutting process, smooth chip removal, capability of ensuring sharp and firm cutting edge and stable cutting processing, and prolongs the service life of the milling cutter.

Description

Milling cutter with spiral cooling hole

Technical Field

The utility model relates to a milling cutter especially relates to a take milling cutter in spiral cooling hole, belongs to cutting tool technical field.

Background

The milling cutter is a common tool for machining, and is mainly used for machining grooves, steps, small planes and various planes which are perpendicular to each other, particularly deep grooves on box parts of steel and cast iron, and can also be used for machining deep holes and spot facing. The main cutting edge of the milling cutter is a side edge on the circumferential surface of the cutting part, the cutting edge on the end surface is a secondary cutting edge, and the surface of a workpiece is machined by utilizing the cutting functions of the main cutting edge and the secondary cutting edge.

In the process of machining the surface of a workpiece, heat is generated by friction between the cutting edge of the milling cutter and the surface of the workpiece, so that the surface of the workpiece is easily hardened, and the cutting difficulty is increased. In order to solve the technical problem in the prior art, cooling liquid is generally adopted for cooling, and the use mode of the cooling liquid is different according to different milling cutter structures: if a solid cylindrical rod-shaped milling cutter is used, cutting is carried out by adopting a mode of adding cooling liquid; when a milling cutter with only a central through hole is used, when cutting machining is carried out, cooling liquid enters and exits on a central axis of the milling cutter, and only the part, close to the central axis, of the milling cutter can be cooled, so that the surfaces of a cutter and a machined workpiece have the conditions of insufficient cooling and uneven cooling in the machining process, the temperature of a cutting area is increased, the surface of the machined workpiece is hardened, the cutting difficulty is increased, and meanwhile, the temperature of the cutter is increased, so that the abrasion of the cutting edge of the cutter is increased; if a plurality of spiral through holes are used as the coolant through holes, the strength and sharpness of the tool are reduced, and the edge is worn seriously or even broken if the structure of the spiral through holes and the structure of the main cutting edge and the auxiliary cutting edge are not designed reasonably. In addition, when the cutter used in the prior art is used for cutting, due to unsmooth chip removal, multiple times of cutting of chips can be caused, and the cutting difficulty and the abrasion of the cutting edge of the cutter can be increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a take milling cutter of spiral cooling hole, the cooling is even, abundant among this milling cutter cutting process, and the chip removal is smooth and easy, can guarantee that the cutting edge is sharp, firm, cutting process is stable, has prolonged milling cutter's life.

The technical scheme of the utility model is that:

a milling cutter with a spiral cooling hole comprises an integrally formed rod body, wherein one end of the rod body forms a cutter handle part, and the other end of the rod body forms a cutting part; a plurality of spiral cutting edges which are spirally arranged are uniformly arranged on the outer circumferential surface of the cutting part at intervals, and spiral chip grooves are formed between two adjacent spiral cutting edges;

end face edges which are the same as the spiral cutting edges in number and correspond to the spiral cutting edges are formed on the end face of the cutting part, and the tail end of each spiral cutting edge is connected with the corresponding end face edge through an RQ arc section along the spiral direction;

the milling cutter is internally provided with through spiral holes with the same number and lead as the spiral cutting edges along the axial direction; an inwards concave liquid separating groove is formed on the end face of the cutter handle part; one end of each through spiral hole is opened in the liquid dividing groove, and the other end of each through spiral hole is opened at the rear corner of the end face blade of the upper end face blade of the cutting part.

The further technical scheme is as follows:

each spiral chip groove all includes a first spiral curved surface and the second spiral curved surface of next-door neighbour spiral cutting edge that constitutes by multistage circular arc smooth connection, and wherein the cross-section of first spiral curved surface is the parabola, and wherein the cross-section of second spiral curved surface is the straight line shape.

The further technical scheme is as follows:

each spiral cutting edge is composed of two spiral curved surfaces which are adjacent and the side surfaces of the spiral cutting edges are intersected, and the cutting edge of the spiral cutting edge is formed at the intersection of the two spiral curved surfaces.

The further technical scheme is as follows:

the tool tip angle gamma of the spiral cutting edge is 68-85 degrees, the rake angle x of the spiral cutting edge is 2-8 degrees, and the relief angle N of the spiral cutting edge is 3-15 degrees.

The further technical scheme is as follows:

the front angle of the end face edge is changed from negative to positive and gradually increased from the central axis of the milling cutter along the radial direction, the back angle alpha of the end face edge is 2-12 degrees, and the side back angle beta of the end face edge is 8-30 degrees.

The further technical scheme is as follows:

the edge lengths of the end face edges are different, and the edge height of the end face edge is 0.03mm-0.08mm according to the difference of the edge lengths.

The further technical scheme is as follows:

the edge length of one of the end face edges passes through the central axis of the milling cutter.

The further technical scheme is as follows:

and the lead LP of the through spiral hole is pi multiplied by D/tg P, wherein D is the diameter of the rod body, and P is the edge inclination angle of the spiral cutting edge.

The further technical scheme is as follows:

a grinding wheel overrun groove is formed between the cutter handle part and the cutting part of the rod body, and the diameter of the grinding wheel overrun groove is smaller than that of the cutter handle part and that of the cutting part; at least one positioning groove is formed in the outer peripheral surface of the knife handle portion.

The further technical scheme is as follows:

the cutting part is provided with at least two spiral cutting edges, at least two end face edges, at least two spiral chip grooves and at least two through spiral holes.

The utility model has the beneficial technical effects that:

1. the utility model discloses the inside spiral hole that link up that sets up of milling cutter, one end opening distribute in dividing the cistern, and other end opening distributes in terminal surface sword rear angle department, and the coolant liquid can be fully even flow through should link up the spiral hole, and the coolant liquid that flows can follow the chip groove and wash away the smear metal to can be even and quick cooling by machined surface and cutter, and reduce the repetitious processing of smear metal.

2. The utility model discloses well link up the spiral hole for with the spiral cutting edge the helical pitch the same and the same spiral hole that link up of quantity, should link up spiral hole and corresponding spiral cutting edge one-to-one, can be better to being cooled off by the helical cutting edge of machined surface especially to the cutter to reduce the temperature in cutting area, avoid the case hardening of work piece, thereby can reduce the cutting degree of difficulty.

3. The utility model discloses the flute profile of well spiral chip groove is helical surface, the chip removal that its shape can be more smooth and easy.

Drawings

FIG. 1 is a perspective view (three-edged) of an embodiment of the present invention;

fig. 2 is a perspective view (four-edged) of another embodiment of the present invention;

FIG. 3 is a schematic view of an embodiment of the present invention (three blades);

fig. 4 is a second (three-blade) schematic structural diagram of an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view A-A of FIG. 3;

FIG. 6 is a schematic cross-sectional view B-B of FIG. 4;

FIGS. 7 and 8 are schematic views of the end faces of the cutting portion of FIG. 4;

wherein:

1. a shank portion;

2. a cutting portion;

3. positioning a groove;

4. a helical cutting edge; 4a, a spiral curved surface; 4b, a spiral curved surface;

5. a grinding wheel overrun groove;

6. penetrating the spiral hole;

7. a liquid separating tank;

8. a spiral chip groove; 8a, a first spiral curved surface; 8b, a second spiral curved surface;

12. an end face blade;

and, wherein:

a central axis O of the milling cutter, a blade inclination angle P of the helical cutting blade, a tip angle γ of the helical cutting blade, a helical cutting blade rake angle x, a helical cutting blade relief angle N, a width T3 of the helical cutting blade relief angle, an end surface blade relief angle α, an end surface blade side relief angle β, a width T1 of the end surface blade relief angle, a blade length E1, E2, E3 and En of the end surface blade; the blade heights W1 and W2.

Detailed Description

In order to make the technical means of the present invention clearer and to implement the present invention according to the content of the specification, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples, which are used for illustrating the present invention and are not intended to limit the scope of the present invention.

This embodiment describes in detail a milling cutter with a helical cooling hole. The milling cutter body is an integrally formed rod made of cemented carbide material, which may be of various shapes, in this particular embodiment a generally cylindrical rod with an O central axis.

One end of the bar forms a shank portion 1, which is mainly used for connection with the spindle of a machine tool. In the embodiment, the tool shank 1 is cylindrical, and a chamfer is formed at the outer circumferential edge of the end face of the tool shank 1, and the chamfer is convenient for guiding when the tool shank is installed. At least one positioning groove 3 can be further formed in the outer peripheral surface of the cutter handle portion 1, the positioning groove 3 is generally formed in a large-diameter milling cutter, and the torque of the large-diameter milling cutter can be increased through the positioning groove 3, so that vibration of the cutter in use is reduced. In addition, a liquid separating groove 7 which is concave along the axial direction is formed on the end surface of the cutter handle part.

The other end of the rod forms a cutting portion 2 which is mainly used for milling a workpiece and which is mainly capable of performing a feeding operation in the axial direction of the rod and a rotating operation around the central axis of the rod. The outer circumferential surface of the cutting part 2 is uniformly provided with a plurality of spiral cutting edges 4 which are spirally arranged at intervals, and a spiral chip groove 8 is formed between two adjacent spiral cutting edges 4.

Wherein, each spiral cutting edge 4 is composed of two spiral

curved surfaces

4a and 4b which are adjacent and the side surfaces of which are intersected, and the intersection of the two spiral curved surfaces forms the cutting edge of the spiral cutting edge 4. The edge inclination angle of each spiral cutting edge 4 is marked as P, the tool tip angle gamma of each spiral cutting edge 4 is 68-85 degrees, and the tool tip angle can take account of the strength and the sharpness of the spiral cutting edge within the range; the front angle x of the spiral cutting edge is 2-8 degrees, and the sharpness of the spiral cutting edge can be further ensured by combining the arrangement of the tool point angle; the helical cutting edge clearance angle N is 3-15 and the width of the helical cutting edge clearance angle is designated as T3.

Each spiral flute 8 comprises a first spiral curved surface 8a formed by smoothly connecting multiple sections of circular arcs and a second spiral curved surface 8b adjacent to the spiral cutting edge 4, wherein the section of the first spiral curved surface 8a is parabolic, and the section of the second spiral curved surface 8b is linear. More specifically, the spiral flute 8 is a curved surface formed by smoothly connecting a plurality of circular arcs including RE, so as to reasonably balance the size of the spiral flute 8 and the strength of the spiral cutting edge 4.

Be formed with the same and corresponding end face sword 12 that sets up with spiral cutting edge 4 quantity on the terminal surface of cutting portion 2, spiral cutting edge 4's tail end links to each other with the end face sword 12 that corresponds via the RQ segmental arc along the screw direction, wherein links to each other with the segmental arc between spiral cutting edge 4 and the end face sword 12 that corresponds, can increase the intensity of knife tip to reduce the condition appearance of knife tip tipping, can prolong milling cutter's life.

Wherein, the end edge rake angle of the end edge 12 is associated with the edge inclination angle P of the helical cutting edge 4, and the end edge rake angle is changed from negative to positive and gradually increased from the central axis of the milling cutter along the radial direction; the end face edge relief angle alpha is 2-12 degrees, and the end face edge side relief angle beta is 8-30 degrees, wherein the width of the end face edge relief angle alpha is denoted as T1.

Wherein, the edge length of the end face edge is different, and the edge height of the end face edge is 0.03mm-0.08mm according to the difference of the edge length. In this embodiment, the edge lengths of the end face edges are denoted as E1, E2, and E3 … … En, respectively, and the end face edge 12 has a certain height difference in the axial direction depending on the edge length, and the height difference is denoted as an edge height, such as edge heights W1 and W2, as shown in fig. 4 of the specification. When the end face edge is designed, the edge length and the edge height are reasonably selected and configured, so that the cutting parts of the cutting edges are reasonably distributed when the end face edge 12 is subjected to cutting processing, and the stress of the cutting edges is uniform. In addition, the edge length of one of the end face edges 12 passes through the central axis of the milling cutter, and in the embodiment, the edge length E1 passes through the central axis of the cutter, so that the end face edge drilling machining can be realized.

A grinding wheel overrun groove 5 is formed between the shank part 1 and the cutting part 2 of the cylindrical bar body, and the diameter of the grinding wheel overrun groove 5 is smaller than the diameters of the shank part 1 and the cutting part 2.

The milling cutter is internally provided with through spiral holes 6 which are equal to the spiral cutting edges 4 in number and have the same lead as the spiral cutting edges 4 in the axial direction, one end of each through spiral hole 6 is opened in a liquid separating groove 7, and the other end of each through spiral hole 6 is opened at an end face edge rear angle alpha of an end face edge 12 on the end face of the cutting part 2. Wherein, the lead LP of the through spiral hole is pi multiplied by D/tg P, wherein D is the diameter of the rod body, and P is the edge inclination angle of the spiral cutting edge. During the use, the coolant liquid that has certain pressure and flow is advanced and is gone into branch cistern 7 to fill this and divide the cistern, then from the open end that is located the through-going spiral hole 6 in branch cistern 7 each through-going spiral hole of abundant, even inflow, through-going spiral hole inside back, flow out from the open end department that is located the through-going spiral hole of terminal surface sword relief angle department, take away the heat and cool off machined surface and cutter, and can begin to wash away the smear metal from the cutter tip, reduce the multiple processing of smear metal.

In addition, in order to improve the strength of the cutting edge of the cutter and the stability of cutting processing, the cutting edge of the cutter can be passivated, such as Rn and Rm shown in the attached figure 6 of the specification; and a coating may be applied to the cutting portion of the tool in order to increase the surface hardness of the entire tool and reduce the friction coefficient.

The cutting portion 2 in this embodiment is formed with at least two helical cutting edges 4, at least two end edges 12, at least two helical flutes 8 and at least two through helical holes 6. Wherein, the attached figures 1 and 3-8 in the specification are the case of three spiral cutting edges, and the attached figure 2 in the specification is the case of four spiral cutting edges.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A milling cutter with a spiral cooling hole comprises an integrally formed rod body, wherein one end of the rod body forms a cutter handle part, and the other end of the rod body forms a cutting part; a plurality of spiral cutting edges which are spirally arranged are uniformly arranged on the outer circumferential surface of the cutting part at intervals, and spiral chip grooves are formed between two adjacent spiral cutting edges; the method is characterized in that:

the milling cutter is internally provided with through spiral holes with the same number and lead as the spiral cutting edges along the axial direction; an inwards concave liquid separating groove is formed on the end face of the cutter handle part; one end of each through spiral hole is opened in the liquid dividing groove, and the other end of each through spiral hole is opened at the rear corner of the end face blade on the end face of the cutting part.

2. The milling cutter with helical cooling holes according to claim 1, wherein: each spiral chip groove all includes a first spiral curved surface and the second spiral curved surface of next-door neighbour spiral cutting edge that constitutes by multistage circular arc smooth connection, and wherein the cross-section of first spiral curved surface is the parabola, and wherein the cross-section of second spiral curved surface is the straight line shape.

3. The milling cutter with helical cooling holes according to claim 1, wherein: each spiral cutting edge is composed of two spiral curved surfaces which are adjacent and the side surfaces of the spiral cutting edges are intersected, and the cutting edge of the spiral cutting edge is formed at the intersection of the two spiral curved surfaces.

4. The milling cutter with helical cooling holes according to claim 1, wherein: the tool tip angle gamma of the spiral cutting edge is 68-85 degrees, the rake angle x of the spiral cutting edge is 2-8 degrees, and the relief angle N of the spiral cutting edge is 3-15 degrees.

5. The milling cutter with helical cooling holes according to claim 1, wherein: the front angle of the end face edge is changed from negative to positive and gradually increased from the central axis of the milling cutter along the radial direction, the back angle alpha of the end face edge is 2-12 degrees, and the side back angle beta of the end face edge is 8-30 degrees.

6. The milling cutter with helical cooling holes according to claim 1, wherein: the edge lengths of the end face edges are different, and the edge height of the end face edge is 0.03mm-0.08mm according to the difference of the edge lengths.

7. The milling cutter with helical cooling holes according to claim 6, wherein: the edge length of one of the end face edges passes through the central axis of the milling cutter.

8. The milling cutter with helical cooling holes according to claim 1, wherein: and the lead LP of the through spiral hole is pi multiplied by D/tg P, wherein D is the diameter of the rod body, and P is the edge inclination angle of the spiral cutting edge.

9. The milling cutter with helical cooling holes according to claim 1, wherein: a grinding wheel overrun groove is formed between the cutter handle part and the cutting part of the rod body, and the diameter of the grinding wheel overrun groove is smaller than that of the cutter handle part and that of the cutting part; at least one positioning groove is formed in the outer peripheral surface of the knife handle portion.

10. The milling cutter with helical cooling holes according to any one of claims 1 to 9, wherein: the cutting part is provided with at least two spiral cutting edges, at least two end face edges, at least two spiral chip grooves and at least two through spiral holes.