Milling reamer

Abstract

The milling reamer comprises a reamer body and at least two blades, the blades are arranged at the axial end of the reamer body in the circumferential direction to form a reamer head part, and chip grooves are formed in the positions, between the adjacent blades, of the reamer body; the cutter body is provided with a mounting groove, the blade is located in the mounting groove, and the blade and the mounting groove are detachably and fixedly connected. At least two blades are arranged at the axial end part of the cutter body along the circumferential direction to form a cutter head part; the cutter body is provided with chip grooves between adjacent blades, the cutter body is provided with mounting grooves, the mounting grooves are in one-to-one correspondence with the blades, and the blades are positioned in the mounting grooves and are detachably and fixedly connected with the mounting grooves, so that after the service life of the cutter is up, only the blades need to be detached, the replaced blades are mounted on the cutter body, and then the cutting edge part is processed; the problem of deformation or strength reduction caused by repeated heating of the cutter body is avoided; the use performance of the cutter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of milling and reaming tools, and in particular to a milling and reaming tool. Background Art

[0002] Existing PCD reamers with larger diameters generally have PCD cutter heads welded onto steel tool bodies. When the tool reaches the end of its service life, the PCD cutter heads will be replaced several times. During the replacement of the PCD cutter heads, the old cutter heads need to be heated and removed, and new cutter heads need to be welded again. In this way, the steel tool body will be deformed and its strength will be reduced after repeated heating, which will not only affect the performance of the tool, but also limit the number of times the PCD cutter heads of the tool body can be replaced. Summary of the invention

[0003] A milling reamer is provided in an embodiment of the present application to solve the problem that the existing steel tool body is deformed and has reduced strength due to repeated heating, which affects the performance of the tool.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A milling reamer comprises a cutter body and at least two blades, each of the blades is arranged circumferentially at an axial end of the cutter body to form a cutter head, and the cutter body is provided with a chip removal groove between adjacent blades;

[0006] The blade body is provided with a mounting groove, the mounting groove corresponds to the blade one by one, the blade is located in the mounting groove, and the two are detachably fixedly connected.

[0007] Optionally, the blade comprises a blade matrix, and the blade matrix comprises:

[0008] A bottom surface, a rake face, a flank face, a first positioning face and a second positioning face, wherein the rake face, the flank face, the first positioning face and the second positioning face are respectively located on four circumferential side walls of the insert base, the rake face is connected to the first positioning face, and the flank face is connected to the second positioning face;

[0009] The front cutting surface, the rear cutting surface, the first positioning surface and the second positioning surface are respectively connected to the bottom surface, and the first positioning surface and the second positioning surface are symmetrically arranged with the vertical section where the cutting edge land is located as a first symmetry plane;

[0010] The distance between the first positioning surface and the first symmetry surface increases gradually from top to bottom; the distance between the second positioning surface and the first symmetry surface increases gradually from top to bottom;

[0011] The first positioning surface and the second positioning surface are respectively matched with the side walls of the installation groove.

[0012] Optionally, in the longitudinal direction of the first symmetry plane away from the cutting edge edge band, the distance between the first positioning surface and the second positioning surface decreases gradually.

[0013] Optionally, in the longitudinal direction of the first symmetric plane, the bottom surface is inclined obliquely downward and backward from the blade tip edge band; and the bottom surface cooperates with the bottom surface of the mounting groove.

[0014] Optionally, a first positioning surface negative clearance angle β1 is provided between the first positioning surface and the vertical surface, and the first positioning surface negative clearance angle β1 is 0°<β1<15°;

[0015] A second positioning surface negative clearance angle β2 is provided between the second positioning surface and the vertical surface, and the second positioning surface negative clearance angle β2 is 0°<β2<15°.

[0016] Optionally, the mounting groove is a trapezoidal groove; the mounting groove comprises:

[0017] A first mounting side surface, a second mounting side surface and a mounting bottom surface, wherein the first mounting side surface is inclined outwardly from top to bottom along the center line of the trapezoidal groove; the second mounting side surface is inclined outwardly from top to bottom along the center line of the trapezoidal groove; and the mounting bottom surface is inclined downwardly from front to back along the center line of the trapezoidal groove.

[0018] Optionally, the front cutting surface and the rear cutting surface are symmetrically arranged along the first symmetry plane;

[0019] In the longitudinal direction of the first symmetry plane away from the cutting edge land, the distance between the front cutting surface and the back cutting surface increases gradually.

[0020] Optionally, the slope θ of the bottom surface is: 2°≤θ<15°.

[0021] Optionally, a first threaded positioning hole is provided on the blade base, and the center of the first threaded positioning hole passes through the first symmetry plane;

[0022] The installation groove is provided with a second threaded positioning hole, and the clamping screw passes through the first threaded positioning hole and the second threaded positioning hole in sequence to fix the blade base and the installation groove.

[0023] Optionally, the blade further comprises a PCD cutter head, wherein the PCD cutter head is fixed on the blade base to form the front cutting surface and the back cutting surface, wherein the front cutting surface extends axially along the radial outer edge of the blade body; and the back cutting surface is located at the axial end of the blade body to form end teeth.

[0024] The milling reamer provided in the embodiment of the present application includes a tool body and at least two blades, each blade is circumferentially arranged at the axial end of the tool body to form a tool head, and the tool body is provided with a chip groove between adjacent blades; the tool body is provided with a mounting groove, the blade is located in the mounting groove, and the two are detachably fixedly connected.

[0025] Compared with the prior art, the milling reamer provided in the embodiment of the present application has the following technical effects:

[0026] At least two blades are arranged circumferentially at the axial end of the cutter body to form a cutter head; the cutter body is provided with a chip groove between adjacent blades, and the cutter body has a mounting groove, the mounting groove corresponds to the blade one by one, the blade is located in the mounting groove and the two are detachably fixedly connected, so that when the tool reaches the end of its service life, it is only necessary to remove the blade, replace the blade and install it on the cutter body, and then process the cutting edge part; the problem of deformation or strength reduction caused by repeated heating of the cutter body is avoided; and the performance of the tool is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 A schematic structural diagram of a milling reamer provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the top view of the blade provided in an embodiment of the present application;

[0030] Figure 3 A schematic cross-sectional view of a blade provided in an embodiment of the present application;

[0031] Figure 4 for Figure 1 Schematic diagram of the lateral structure;

[0032] Figure 5 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0033] The following are marked in the accompanying drawings:

[0034] Cutter body 1, blade 2, clamping screw 3;

[0035] Coolant hole 11 , rake face 21 , flank face 22 , PCD tool head 23 , first positioning face 24 , second positioning face 25 , first threaded positioning hole 26 , bottom face 27 . DETAILED DESCRIPTION

[0036] The embodiment of the invention discloses a milling reamer to solve the problems that the existing steel cutter body is deformed and the strength is reduced due to repeated heating, which affects the performance of the cutter.

[0037] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0038] See also Figure 1-5 , Figure 1 A schematic structural diagram of a milling reamer provided in an embodiment of the present application; Figure 2 A schematic diagram of the top view of the blade 2 provided in an embodiment of the present application; Figure 3 A schematic cross-sectional view of a blade 2 provided in an embodiment of the present application; Figure 4 for Figure 1 Schematic diagram of the lateral structure; Figure 5 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0039] In a specific embodiment, the milling reamer of the present application includes a cutter body 1 and at least two blades 2. The cutter body 1 is preferably a cemented carbide matrix, which has better strength than the original rod cutter body 1 with a PCD cutter head structure, which improves the overall stability of the cutter and increases the life of the cutter. Each blade 2 is arranged at the circumferential end of the cutter body 1, and is arranged circumferentially at the axial end of the cutter body 1 to form a cutter head; preferably, each blade 2 is evenly arranged in the circumferential direction; the cutter body 1 is provided with a mounting groove for mounting the blade 2, and the mounting groove and the blade 2 correspond one to one. The blade 2 is located in the mounting groove, and the two are detachably fixedly connected, such as by a clamping screw 3; thus, after the cutter reaches the end of its service life, it is only necessary to remove the blade 2 and replace the blade 2, without repeatedly heating the cutter body 1, the overall rigidity of the cutter is better, the processing process is smoother, and the service life of the cutter is extended.

[0040] It can be understood that a chip groove is provided on the tool body 1, and the mounting groove is preferably arranged in the extension direction of the chip groove; a coolant hole 11 is provided in the axial direction of the tool body 1, and the extension lines of the blades of each blade 2 intersect at the same point of the axis where the coolant hole 11 is located, so as to facilitate the outflow of coolant; the chip groove and the coolant hole 11 can be arranged according to the existing technology and will not be repeated here.

[0041] Compared with the prior art, the milling reamer provided in the embodiment of the present application has the following technical effects:

[0042] At least two blades 2 are arranged along the circumferential direction at the axial end of the tool body 1 to form a tool head; the tool body 1 is provided with a chip groove between adjacent blades 2, and the tool body 1 has a mounting groove, the mounting groove corresponds to the blade 2 one by one, the blade 2 is located in the mounting groove and the two are detachably fixedly connected, so that when the tool reaches the end of its service life, it is only necessary to remove the blade 2, and the replaced blade 2 is installed on the tool body 1, and then the cutting edge part is processed; the problem of deformation or strength reduction caused by repeated heating of the tool body 1 is avoided; and the performance of the tool is improved.

[0043] In order to position the blade 2 on the cutter body 1, the blade 2 includes a blade 2 matrix and a PCD cutter head 23; wherein the blade 2 matrix is ​​a quadrilateral blade 2 matrix, and the blade 2 matrix includes a bottom surface 27, a front cutting surface 21, a back cutting surface 22, a first positioning surface 24 and a second positioning surface 25; the above four surfaces are respectively arranged on the four circumferential side walls of the blade 2 matrix, the front cutting surface 21 is connected to the first positioning surface 24, the back cutting surface 22 is connected to the second positioning surface 25, and the front cutting surface 21, the back cutting surface 22 , the first positioning surface 24 and the second positioning surface 25 are connected to the bottom surface 27 respectively; it can be understood that the surface where the blade of the PCD cutter head 23 is located forms a rake face 21, and the rake face 21 and the back face 22 are connected to form a cutting edge and a cutting edge band, which can be specifically set according to the existing technology; the PCD cutter head 23 is fixed on the base of the blade 2 to form a rake face 21 and a back face 22, and the rake face 21 extends axially along the radial outer edge of the blade body 1; the back face 22 is located at the axial end of the blade body 1 to form an end tooth. In order to position the installation of the blade 2 base on the blade body 1, the first positioning surface 24 and the second positioning surface 25 are symmetrically arranged with the vertical section where the cutting edge band is located as the first symmetry plane; at the same time, the spacing between the first positioning surface 24 and the first symmetry plane gradually increases from top to bottom, and the spacing between the second positioning surface 25 and the first symmetry plane gradually increases from top to bottom; here, from top to bottom is based on the vertical direction of the blade 2 base, the top surface of the blade 2 base is the top, and the bottom surface 27 is the bottom. The inclined setting of the first positioning surface 24 and the second positioning surface 25 generates a vertical force component, which increases the force acting on the bottom surface 27 of the blade 2 base and increases stability; at the same time, it increases the contact area between the positioning surface and the mounting groove, increases the force-bearing area, and further improves stability.

[0044] It can be understood that the side walls of the mounting groove cooperate with the first positioning surface 24 and the second positioning surface 25 respectively, and according to the structural arrangement of the first positioning surface 24 and the second positioning surface 25, the side walls of the mounting groove are arranged accordingly.

[0045] Specifically, in the longitudinal direction of the first symmetric plane away from the blade edge band, the spacing between the first positioning surface 24 and the second positioning surface 25 decreases, and in the horizontal projection direction, the first positioning surface 24 and the second positioning surface 25 form a V-shaped structure; this arrangement makes the blade 2 base body and the blade body 1 more concentrated after installation, especially for the tip of the V-shaped structure, to improve the clamping force of the rear end of the blade 2 base body and increase stability. Further, the first positioning surface 24 and the second positioning surface 25 are transitioned through an arc surface at one end away from the blade edge band, and the angle between the arc surface and the vertical surface can be set according to the inclination angle of the first positioning surface 24, and the arc surface is further used to increase the contact area with the installation groove, increase the force acting on the bottom of the blade 2 base body, and further increase the stability of the device.

[0046] Furthermore, in the longitudinal direction of the first symmetry plane, the bottom surface 27 is tilted backward and downward from the blade edge band, further pressing the bottom surface 27 into the installation groove of the blade body 1, while increasing the contact area between the rear end of the bottom surface 27 and the installation groove; it can be understood that the setting mode of the bottom surface 27 tilting backward and downward, with the direction of the blade edge band as the front and the direction away from the blade edge band as the back, is convenient for the blade 2 base body to be fastened in the current position, and is less likely to shake than the plane structure; through the inclined structure setting of the first positioning surface 24, the second positioning surface 25 and the ground, the blade 2 base body is firmly fixed on the blade body 1, improving the stability of the device. It can be understood that the bottom surface 27 cooperates with the bottom surface of the installation groove, and the structure of the bottom surface 27 of the installation groove is set according to the structure of the bottom surface 27. The slope θ of the bottom surface 27 is: 2°≤θ<15°. It can be understood that the slope of the bottom surface 27 is the angle between the bottom surface 27 and the horizontal plane.

[0047] Specifically, a negative back angle β1 of the first positioning surface 24 is provided between the first positioning surface 24 and the vertical surface, and the negative back angle β1 of the first positioning surface 24 is 0°<β1<15°; so as to optimize the device structure while providing the vertical force component, and facilitate production and processing. Similarly, a negative back angle β2 of the second positioning surface 25 is provided between the second positioning surface 25 and the vertical surface, and the negative back angle β2 of the second positioning surface 25 is 0°<β2<15°. Furthermore, the angle α between the first positioning surface 24 and the second positioning surface 25 is: 35°≤α≤80°, as described above, that is, the angle between the two side walls of the V-shaped structure is 35°≤α≤80°.

[0048] It can be understood that the mounting groove is arranged accordingly according to the structure of the first positioning surface 24, the second positioning surface 25 and the bottom surface 27, that is, the mounting groove is a trapezoidal groove; the mounting groove includes a first mounting side surface, a second mounting side surface and a mounting bottom surface, the first mounting side surface is inclined outward from top to bottom along the center line of the trapezoidal groove; the second mounting side surface is inclined outward from top to bottom along the center line of the trapezoidal groove; the mounting bottom surface is inclined downward from front to back along the center line of the trapezoidal groove, and is thus arranged to cooperate with the structure of each positioning surface of the blade 2 base to realize the installation positioning of the blade 2 base.

[0049] In another embodiment, the rake face 21 and the flank face 22 are symmetrically arranged along the first symmetry plane; in the longitudinal direction of the first symmetry plane away from the tool tip land, the distance between the rake face 21 and the flank face 22 increases. Thus, the rake face 21, the flank face 22, the first positioning face 24 and the second positioning face 25 form a quadrilateral structure, improving the structural stability.

[0050] On the basis of the above embodiments, a first threaded positioning hole 26 is provided on the blade 2 substrate, and the center of the threaded positioning hole passes through the first symmetry plane; the inscribed circles of the threaded positioning holes are respectively tangent to the first positioning face 24 and the second positioning face 25; the axis of the first threaded positioning hole 26 is perpendicular to the top surface of the blade 2 substrate. The mounting groove is provided with a second threaded positioning hole, and the compression screw 3 sequentially passes through the first threaded positioning hole 26 and the second threaded positioning hole to fix the blade 2 substrate and the mounting groove. By aligning the center of the first threaded positioning hole 26 with the first symmetry plane during installation, the installation accuracy of the device is improved, and the cooperation between the compression screw 3 and the threaded positioning hole realizes the fixation of the blade 2 substrate and the mounting groove. Preferably, the diameter ∮d of the inscribed circle of the first threaded positioning hole 26 is: 6 mm ≤ ∮d ≤ ∮16 mm.

[0051] In one embodiment, the thickness T of the blade 2 substrate is: 3 mm ≤ T ≤ 7 mm, and this thickness is the thickness at the tool tip; the end tooth flank angle β3 is 6° < β3 < 20°; the end tooth deflection angle length L1 is: 0.1 mm ≤ L1 ≤ 0.4 mm; the end tooth deflection angle γ1 is 5° ≤ γ1 ≤ 20°; the end tooth overhang amount L2 is: 0.5 mm ≤ L2 ≤ 2 mm; the outer diameter flank angle β4 is: 6° < β4 < 25°; the high center value L3 of the rake face 21 of the blade 2 is 0 < L3 < 0.4 mm; the land width L4 is: 0.15 mm ≤ L4 < 0.6 mm.

[0052] The above device changes the PCD cutter head 23 from the original welded structure to a blade 2 structure, which is pressed into the blade 2 groove of the steel cutter body 1 by screws. When the tool reaches the end of its service life, it is only necessary to remove the blade 2 and replace the PCD cutter head 23 on the blade 2. After replacement, the blade 2 is installed on the steel cutter body 1, and then the PCD cutting edge is processed; thus avoiding repeated heating of the steel cutter body 1. The blade 2 adopts a cemented carbide substrate, and the PCD cutter head 23 is welded on the blade 2 substrate. The two V-shaped side surfaces on the substrate are positioning surfaces, and the two side surfaces adopt a negative back angle structure. Compared with the common positive back angle or zero back angle, the positioning will be more secure; at the same time, there is an inclined surface on the bottom surface 27 of the blade. After being installed on the cutter body 1, the blade 2 is inclined toward the center of the cutter body 1. When the clamping screw 3 is locked, the blade 2 will be firmly pressed on the cutter body 1. A carbide substrate is provided between the steel tool body 1 and the PCD tool head 23 for support, which has better strength than the original structure of welding the PCD tool head 23 on the steel tool body 1, improves the overall stability of the tool, and increases the tool life.

[0053] It has the following advantages: the overall rigidity of the tool is better, the processing process is smoother, and the service life of the tool can be extended; when the tool reaches the end of its service life, it is more convenient to replace the PCD cutter head 23 by simply removing the blade 2, and it will not affect the performance of the steel cutter body 1 itself; the service life of the steel cutter body 1 can be greatly extended; the blade 2 is not only suitable for reaming, but also for boring, milling, and turning, and the edge form of the blade 2 can be changed according to the change of the use occasion. The material of the cutter head also changes according to the change of the material of the workpiece, and the cutter head can be PCBN, ceramic, ND, MCD, CVD, etc., and can be set according to the existing technology.

[0054] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A milling reamer, characterized in that: The tool comprises a tool body and at least two blades, each of the blades is arranged along the circumferential direction at the axial end of the tool body to form a tool head, and the tool body is provided with a chip removal groove between adjacent blades; The blade body is provided with a mounting groove, the mounting groove corresponds to the blade one by one, the blade is located in the mounting groove, and the two are detachably fixedly connected.

2. The milling reamer according to claim 1, characterized in that: The blade comprises a blade matrix, and the blade matrix comprises: A bottom surface, a rake face, a flank face, a first positioning face and a second positioning face, wherein the rake face, the flank face, the first positioning face and the second positioning face are respectively located on four circumferential side walls of the insert base, the rake face is connected to the first positioning face, and the flank face is connected to the second positioning face; The front cutting surface, the rear cutting surface, the first positioning surface and the second positioning surface are respectively connected to the bottom surface, and the first positioning surface and the second positioning surface are symmetrically arranged with the vertical section where the cutting edge land is located as a first symmetry plane; The distance between the first positioning surface and the first symmetry surface increases gradually from top to bottom; the distance between the second positioning surface and the first symmetry surface increases gradually from top to bottom; The first positioning surface and the second positioning surface are respectively matched with the side walls of the installation groove.

3. The milling reamer according to claim 2, characterized in that: In the longitudinal direction of the first symmetry plane away from the cutting edge land, the distance between the first positioning surface and the second positioning surface decreases gradually.

4. The milling reamer according to claim 3, characterized in that: In the longitudinal direction of the first symmetric plane, the bottom surface is inclined backward and downward from the blade edge band; the bottom surface is matched with the bottom surface of the mounting groove.

5. The milling reamer according to claim 2, characterized in that: A first positioning surface negative clearance angle β1 is provided between the first positioning surface and the vertical surface, and the first positioning surface negative clearance angle β1 is 0°<β1<15°; A second positioning surface negative clearance angle β2 is provided between the second positioning surface and the vertical surface, and the second positioning surface negative clearance angle β2 is 0°<β2<15°.

6. The milling reamer according to claim 3, characterized in that: The mounting groove is a trapezoidal groove; the mounting groove comprises: A first mounting side surface, a second mounting side surface and a mounting bottom surface, wherein the first mounting side surface is inclined outwardly from top to bottom along the center line of the trapezoidal groove; the second mounting side surface is inclined outwardly from top to bottom along the center line of the trapezoidal groove; and the mounting bottom surface is inclined downwardly from front to back along the center line of the trapezoidal groove.

7. The milling reamer according to claim 2, characterized in that: The front cutting edge and the rear cutting edge are symmetrically arranged along the first symmetry plane; In the longitudinal direction of the first symmetry plane away from the cutting edge land, the distance between the front cutting surface and the back cutting surface increases gradually.

8. The milling reamer according to claim 2, characterized in that: The slope θ of the bottom surface is: 2°≤θ<15°.

9. The milling reamer according to any one of claims 1 to 8, characterized in that: The blade base is provided with a first threaded positioning hole, the center of which passes through the first symmetry plane; The installation groove is provided with a second threaded positioning hole, and the clamping screw passes through the first threaded positioning hole and the second threaded positioning hole in sequence to fix the blade base and the installation groove.

10. The milling reamer according to claim 9, characterized in that: The blade also includes a PCD cutter head, which is fixed on the blade base to form the front cutting surface and the back cutting surface. The front cutting surface extends axially along the radial outer edge of the blade body; the back cutting surface is located at the axial end of the blade body to form end teeth.

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