Machine clamp type milling cutter with spherical conjunction surface

Abstract

The utility model relates to the technical field of milling cutters, in particular to a mechanically-clamped milling cutter with a spherical wedging surface, which comprises a cutter body and a plurality of blades, the cutter body comprises a connecting part and a cutter head part which are integrally and coaxially connected, a plurality of cutter mounting grooves are arranged on the peripheral side of the cutter head part in an annular array, and the bottom wall of each cutter mounting groove is convexly provided with a convex spherical wedging surface. The bottom surfaces of the blades are concavely provided with concave spherical fit surfaces, the convex spherical fit surfaces are matched with the concave spherical fit surfaces in a concave-convex manner, the plurality of blades are respectively arranged in one-to-one correspondence with the plurality of cutter mounting grooves, the blades are locked in the cutter mounting grooves through locking bolts, and the spherical gradient of the convex spherical fit surfaces is 1: 5. The radial shearing force and the axial outer pulling force borne by the locking bolt can be overcome, the risk that the locking bolt is prone to loosening or breaking is avoided, the blade is firm in assembly, safe in milling and good in stability, the service life of the blade can be prolonged, and the quality of milled products is good.

Description

Technical Field

[0001] The utility model relates to the technical field of milling cutters, in particular to a machine-clamped milling cutter with a spherical fitting surface. Background Art

[0002] In traditional machine-clamped milling cutters, the mounting surface of common machine-clamped carbide blades is a plane, especially the bottom surface of the blade. The mounting surface of the machine-clamped cutter body is also a plane, and the assembly of the blade and the cutter body is combined through the plane. During heavy-load milling, the blade mills the material, and the blade's edge peels the material off the processed product. When peeling the material, the force applied to the blade will act on the locking bolt, causing the locking bolt to be subjected to a large axial external tension and radial shear force, which makes the locking bolt easy to loosen or break, posing a safety hazard in milling. In addition, the assembly firmness of the blade is poor, and the quality of the milled product is difficult to guarantee, which can easily shorten the service life of the blade. Therefore, the defects are very obvious, and a solution is urgently needed. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a machine-clamped milling cutter with a spherical fitting surface.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A machine-clamped milling cutter with a spherical fitting surface comprises a cutter body and a plurality of blades, the cutter body comprising an integrally coaxially connected connection portion and a cutter head portion, a plurality of tool mounting grooves are arranged in a ring array on the circumference of the cutter head portion, a convex spherical fitting surface is convexly provided on the bottom wall of the tool mounting groove, a concave spherical fitting surface is concavely provided on the bottom surface of the blade, the convex spherical fitting surface is matched with the concave spherical fitting surface, the plurality of blades are arranged in one-to-one correspondence with the plurality of tool mounting grooves, the blades are locked in the tool mounting grooves via locking bolts, and the spherical slope of the convex spherical fitting surface is 1:5.

[0006] Furthermore, a countersunk through hole is opened in the middle of the blade, and the countersunk through hole passes through the concave spherical fitting surface. A threaded hole connected to the countersunk through hole is arranged in the middle of the convex spherical fitting surface. The screw rod of the locking bolt passes through the countersunk through hole and is threadedly connected with the threaded hole. The nut of the locking bolt is located in the countersunk through hole.

[0007] Furthermore, two adjacent side walls of the blade groove are each provided with a contact surface, and the contact surface is used to contact with the side wall of the blade.

[0008] Furthermore, grooves are provided at the corners of the knife slot, and the corners of the blade extend into the corresponding grooves.

[0009] Furthermore, an assembly groove is concavely provided on the top end surface of the connecting portion.

[0010] Furthermore, the cutter head is provided with a plurality of coolant holes in a circular array, and the plurality of coolant holes are respectively provided in one-to-one correspondence with the plurality of tool mounting grooves, and the coolant holes are used to supply coolant to the blades in the corresponding tool mounting grooves.

[0011] The beneficial effects of the utility model are as follows: in practical applications, the blade is locked in the tool slot via a locking bolt, so that the inner concave spherical fitting surface on the blade fits tightly with the outer convex spherical fitting surface in the tool slot. During the milling process, since the outer convex spherical fitting surface fits the inner concave spherical fitting surface concavely and convexly, and the spherical slope of the outer convex spherical fitting surface is 1:5, the radial shear force and axial external tension force on the locking bolt can be overcome, avoiding the risk of the locking bolt being easily loosened or broken, making the blade assembly firm, milling safe, stable, able to extend the service life of the blade, and the quality of the milled product is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0013] Figure 2 It is a schematic diagram of the exploded structure of the utility model.

[0014] Figure 3 It is a three-dimensional structural schematic diagram of the blade of the utility model.

[0015] Description of reference numerals:

[0016] 1. Cutter body; 2. Blade; 3. Connecting part; 4. Cutter head; 5. Cutter mounting groove; 6. Outer convex spherical fitting surface; 7. Inner concave spherical fitting surface; 8. Countersunk through hole; 9. Threaded hole; 10. Contact surface; 11. Groove; 12. Assembly groove; 13. Coolant hole; 14. Locking bolt. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0018] like Figures 1 to 3 As shown, the utility model provides a machine-clamped milling cutter with a spherical fitting surface, which includes a cutter body 1 and a plurality of blades 2. The cutter body 1 includes an integrally coaxially connected connecting portion 3 and a cutter head portion 4. The circumferential side of the cutter head portion 4 is provided with a plurality of tool mounting grooves 5 in a ring array. The bottom wall of the tool mounting groove 5 is convexly provided with an outer convex spherical fitting surface 6. The bottom surface of the blade 2 is concavely provided with an inner concave spherical fitting surface 7. The outer convex spherical fitting surface 6 is concavely matched with the inner concave spherical fitting surface 7. The plurality of blades 2 are respectively arranged in one-to-one correspondence with the plurality of tool mounting grooves 5. The blades 2 are locked in the tool mounting grooves 5 via locking bolts 14. The spherical slope of the outer convex spherical fitting surface 6 is 1:5.

[0019] In actual application, the blade 2 is locked in the tool groove 5 via the locking bolt 14, so that the concave spherical fitting surface 7 on the blade 2 is tightly fitted with the convex spherical fitting surface 6 in the tool groove 5. During the milling process, since the convex spherical fitting surface 6 and the concave spherical fitting surface 7 are concave-convexly matched, and the spherical slope of the convex spherical fitting surface 6 is 1:5, the radial shear force and axial external tension force on the locking bolt 14 can be overcome, avoiding the risk of the locking bolt 14 being easily loosened or broken, so that the blade 2 is firmly assembled, the milling is safe and stable, the service life of the blade 2 can be extended, and the quality of the milled product is good.

[0020] In this embodiment, a countersunk through hole 8 is provided in the middle of the blade 2, and the countersunk through hole 8 passes through the inner concave spherical fitting surface 7. A threaded hole 9 connected to the countersunk through hole 8 is provided in the middle of the outer convex spherical fitting surface 6. The screw of the locking bolt 14 passes through the countersunk through hole 8 and is threadedly connected with the threaded hole 9. The nut of the locking bolt 14 is located in the countersunk through hole 8. This structural design is conducive to firmly locking the blade 2 in the blade mounting groove 5.

[0021] In this embodiment, the two adjacent side walls of the blade groove 5 are provided with a contact surface 10, and the contact surface 10 is used to contact the side wall of the blade 2. When the blade 2 is assembled, the contact surface 10 contacts the side wall of the blade 2 to position the blade 2, thereby improving the position accuracy and stability of the installed blade 2.

[0022] In this embodiment, grooves 11 are provided at the corners of the blade slot 5, and the corners of the blade 2 extend into the corresponding grooves 11. This structural design, on the one hand, provides a space for the corners of the blade 2 to avoid, and on the other hand, the grooves 11 can allow coolant to flow, so that the coolant cools the blade 2.

[0023] In this embodiment, an assembly groove 12 is concavely formed on the top surface of the connecting portion 3 ; the assembly groove 12 facilitates the assembly of the connecting portion 3 with the external structure, and the assembly stability is good.

[0024] In this embodiment, the cutter head 4 is provided with a plurality of coolant holes 13 in a circular array, and the plurality of coolant holes 13 are respectively provided in one-to-one correspondence with the plurality of tool mounting grooves 5, and the coolant holes 13 are used to supply coolant to the blades 2 in the corresponding tool mounting grooves 5. The coolant holes 13 supply coolant to the blades 2 in the tool mounting grooves 5 to cool the blades 2.

[0025] Specifically, the outer convex spherical fitting surface 6 is coated with a wear-resistant coating layer, and the thickness of the wear-resistant coating layer is 0.5 mm. This structural design increases the wear resistance of the outer convex spherical fitting surface 6 and is not easy to wear.

[0026] All technical features in this embodiment can be freely combined according to actual needs.

[0027] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A machine-clamped milling cutter having a spherical mating surface, characterized in that: The invention comprises a blade body (1) and a plurality of blades (2), wherein the blade body (1) comprises a connecting portion (3) and a blade head portion (4) which are coaxially connected in an integral manner, wherein a plurality of blade mounting grooves (5) are arranged in an annular array on the circumference of the blade head portion (4), wherein the bottom wall of the blade mounting groove (5) is provided with a convex spherical fitting surface (6), and the bottom surface of the blade (2) is provided with a concave spherical fitting surface (7), wherein the convex spherical fitting surface (6) is matched with the concave spherical fitting surface (7), wherein the plurality of blades (2) are arranged in a one-to-one correspondence with the plurality of blade mounting grooves (5), wherein the blades (2) are locked in the blade mounting grooves (5) via locking bolts (14), and the spherical slope of the convex spherical fitting surface (6) is 1:

5.

2. A machine-clamped milling cutter with a spherical mating surface according to claim 1, characterized in that: A countersunk through hole (8) is provided in the middle of the blade (2), and the countersunk through hole (8) passes through the inner concave spherical fitting surface (7). A threaded hole (9) connected to the countersunk through hole (8) is provided in the middle of the outer convex spherical fitting surface (6). The screw of the locking bolt (14) passes through the countersunk through hole (8) and is threadedly connected with the threaded hole (9). The nut of the locking bolt (14) is located in the countersunk through hole (8).

3. The machine-clamped milling cutter with a spherical mating surface according to claim 1, characterized in that: Two adjacent side walls of the blade groove (5) are both provided with abutment surfaces (10), and the abutment surfaces (10) are used to abut against the side walls of the blade (2).

4. The machine-clamped milling cutter with a spherical mating surface according to claim 1, characterized in that: The corners of the blade mounting groove (5) are all provided with grooves (11), and the corners of the blade (2) extend into the corresponding grooves (11).

5. The machine-clamped milling cutter with a spherical mating surface according to claim 1, characterized in that: An assembly groove (12) is concavely provided on the top end surface of the connecting portion (3).

6. The machine-clamped milling cutter with a spherical mating surface according to claim 1, characterized in that: The cutter head (4) is provided with a plurality of cooling liquid holes (13) in a circular array. The plurality of cooling liquid holes (13) are respectively provided in one-to-one correspondence with the plurality of cutting grooves (5). The cooling liquid holes (13) are used to supply cooling liquid to the cutting blades (2) in the corresponding cutting grooves (5).

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