Large-feeding curved surface milling cutter

Abstract

The invention belongs to the technical field of milling cutters, and particularly provides a large-feed curved-surface milling cutter which comprises a cutter handle and a cutter head, the cutter head is arranged at one end of the cutter handle, and the tail end of the cutter head is spherical; the tool bit comprises a main cutting part and a side cutting part, an end chip removal groove is formed in the main cutting part, a side chip removal groove is formed in the side cutting part, and the main chip removal groove is communicated with the side chip removal groove; the main cutting part comprises four main cutting edges and a transition chisel edge, the main chip grooves are located in the two adjacent main cutting edges, the main cutting edges are evenly distributed at the tail end of the tool bit in a spiral curved surface mode, the transition chisel edge is connected with one set of opposite main cutting edges, and chip outlets leading to the main chip grooves in the two sides are formed by tool noses of the other set of main cutting edges and the transition chisel edge. The side cutting part comprises four side cutting edges, the side cutting edges are in smooth connection with the main cutting edge, and the side chip grooves are located between every two adjacent side cutting edges and extend to the cutter handle in a spiral shape. The feeding amount of the milling cutter can be effectively increased, so that the machining efficiency is improved, and meanwhile, the milling cutter has relatively long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of milling cutters, and in particular relates to a large-feed curved surface milling cutter. Background Art

[0002] With the development of mold manufacturing, the demand for CNC milling cutters for complex curved surfaces is increasing. Commonly used tools in CNC machining of complex curved surfaces are ball end mills and ring mills.

[0003] A ball end mill is a tool with a blade similar to a ball end that is mounted on a milling machine and used to mill various curved surfaces and arc grooves. It is widely used in the processing of various materials such as mold steel, cast iron, carbon steel, alloy steel, tool steel, and general iron. Due to its unique shape, the ball end mill is particularly suitable for processing complex curved surfaces and arc grooves, making it play an important role in mold manufacturing and other fields that require high-precision curved surface processing.

[0004] However, existing ball end mills have the problem of low processing efficiency. For example, in the roughing stage, the spindle motor has poor ability to resist axial force. In addition, the cutting speed and cutting force of ball end mills may be lower than those of some special milling cutters, which also affects its processing efficiency. The cutting rate at different radii of ball end mills is not constant, especially the cutting line speed at the tip of the tool is zero, and the cutting conditions are poor, resulting in reduced processing efficiency and surface quality, increased blade wear, and short tool life.

[0005] Therefore, the above problems need to be solved urgently. Summary of the invention

[0006] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a large feed surface milling cutter with a simple structure and reasonable design, which can effectively increase the feed rate of the milling cutter and thus improve the processing efficiency, and at the same time has a long service life.

[0007] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a large-feed curved surface milling cutter, comprising a tool handle and a tool head, wherein the tool head is arranged at one end of the tool handle, and the end of the tool head is spherical; The cutter head comprises a main cutting part and a side cutting part, the main cutting part is provided with an end chip removal groove, the side cutting part is provided with a side chip removal groove, and the main chip removal groove is communicated with the side chip removal groove; The main cutting part includes four main cutting edges and a transition chisel edge, the main chip grooves are located at two adjacent main cutting edges, the main cutting edges are spirally curved and evenly distributed at the end of the cutter head, the transition chisel edge is connected to a group of opposite main cutting edges, and the tips of the other group of main cutting edges and the transition chisel edge form a chip removal opening leading to the main chip grooves on both sides; The side cutting portion comprises four side cutting edges, the side cutting edges are smoothly connected to the main cutting edge, the side chip groove is located between two adjacent side cutting edges, and the side chip groove is spirally extended to the tool handle.

[0008] Furthermore, the side cutting edges are distributed in a spiral shape, and the spiral angle of the side cutting edges is 30°-40°.

[0009] Furthermore, the main chip removal groove includes a first chip removal surface and a second chip removal surface, the edge of the first chip removal surface is connected to the second chip removal surface, the first chip removal surface is a convex spherical surface, and the second chip removal surface is a concave spherical surface.

[0010] Furthermore, the top surface of the first chip groove is transitionally connected to the chip outlet, one side surface is connected to the root of one side of the main cutting edge, the other side surface is respectively connected to the second chip surface and the side chip groove, and the bottom surface of the first chip groove is transitionally connected to the side chip groove.

[0011] Furthermore, the second chip removal surface is a concave three-sided spherical surface, the bottom surface of which is connected to the side chip removal groove, and the other side surface smoothly transitions and connects the back of the main cutting edge and the back of the side cutting edge.

[0012] Furthermore, the knife handle and the cutter head are integrally formed of titanium alloy material, and a chip guide portion is provided at the connection between the knife handle and the cutter head, and the chip guide portion is connected to a side chip discharge groove.

[0013] Furthermore, the thickness of the transition chisel edge gradually decreases from its blade root to the blade edge.

[0014] Furthermore, the cutter head is provided with a CVD coating or a PVD coating.

[0015] It can be seen from the above technical solution that the present invention has the following beneficial effects: The present invention provides a large-feed curved surface milling cutter, which is a four-edge milling cutter, in which two main cutting edges are connected by a transition chisel edge. The transition chisel edge can provide a larger circumferential cutting force during processing, thereby reducing the force on the main cutting edge; at the same time, the chip removal port and the main and side chip removal grooves can provide a good chip removal effect; the coating on the cutter head can significantly improve the hardness, wear resistance, corrosion resistance and other properties of the milling cutter, thereby extending the service life of the milling cutter. The above technical means can increase the feed amount of the milling cutter and improve the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a large feed surface milling cutter according to the present invention Figure 2 The figure is a front view of a large feed curved surface milling cutter according to the present invention.

[0017] In the figure: 1-handle, 11-chip guide; 2-cutter head, 21-main cutting edge, 22-transition chisel edge, 23-chip removal port, 24-side cutting edge; 3-main chip discharge groove, 31-first chip discharge surface, 32-second chip discharge surface; 4-Side chip grooves. DETAILED DESCRIPTION

[0018] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0019] like Figure 1-2 As shown, a high-feed curved surface milling cutter comprises a tool handle 1 and a tool head 2, wherein the tool head 2 is arranged at one end of the tool handle 1, and the end of the tool head 2 is spherical; The cutter head 2 includes a main cutting part and a side cutting part. The main cutting part is provided with an end chip removal groove 3, and the side cutting part is provided with a side chip removal groove 4. The main chip removal groove 3 is communicated with the side chip removal groove 4. The main cutting part includes four main cutting edges 21 and a transition chisel edge 22. The main chip groove 3 is located at two adjacent main cutting edges 21. The main cutting edges 21 are spirally curved and evenly distributed at the end of the cutter head 2. The transition chisel edge 22 is connected to a group of opposite main cutting edges 21. The tips of the other group of main cutting edges 21 and the transition chisel edge 22 form a chip removal opening 23 leading to the main chip grooves 3 on both sides. The side cutting portion includes four side cutting edges 24 , and the side cutting edges 24 are smoothly connected to the main cutting edge 21 . The side chip groove 3 is located between two adjacent side cutting edges 24 , and the side chip groove 3 is spirally extended to the tool handle 1 .

[0020] The side cutting edge 24 is smoothly spirally connected to the main cutting edge 21 to ensure strength and prevent damage.

[0021] During processing, the workpiece is processed simultaneously by the main cutting edge 21, the transition chisel edge 22 and the side cutting edge 24, and the force on each processing tooth number is small. Under the same conditions, a larger feed rate can be selected for processing, thereby improving the processing efficiency. At the same time, a chip discharge port 23 is formed between the other two main cutting edges 21 and the transition chisel edge 22, and the waste chips cut by the main cutting edge 21 and the transition chisel edge 22 can be efficiently discharged from the chip discharge port 23 to the main chip discharge groove 3 to avoid accumulation, thereby improving the processing efficiency.

[0022] Specifically, the side cutting edge 24 is distributed in a spiral shape, and the spiral angle of the side cutting edge 24 is 30°-40°. In this embodiment, the spiral angle is 35°, the tool length is 100 mm, the length of the cutter head 2 is 48 mm, and the diameter of the end of the cutter head 2 is 20 mm.

[0023] The main chip removal groove 3 includes a first chip removal surface 31 and a second chip removal surface 32, the edge of the first chip removal surface 31 is connected to the second chip removal surface 32, the first chip removal surface 31 is a convex spherical surface, and the second chip removal surface 32 is a concave spherical surface. The top surface of the first chip removal groove 31 is transitionally connected to the chip removal port 23, one side surface is connected to the root of one side of the edge of the main cutting edge 21, and the other side surface is respectively connected to the second chip removal surface 32 and the side chip removal groove 4, and the bottom surface of the first chip removal groove 31 is transitionally connected to the side chip removal groove 4. The second chip removal surface 32 is a concave three-sided spherical surface, the bottom surface of which is connected to the side chip removal groove 4, and the other side surface smoothly transitionally connects the back of the main cutting edge 21 and the back of the side cutting edge 24. The waste chips generated by cutting by the cutting edge are efficiently introduced into the side chip removal groove 4 through the first chip removal surface 31 and the second chip removal surface 32.

[0024] Specifically, the knife handle 1 and the cutter head 2 are integrally formed of titanium alloy material, and a chip guide portion 11 is provided at the connection between the knife handle 1 and the cutter head 2 , and the chip guide portion 11 is communicated with the side chip groove 4 .

[0025] The thickness of the transition chisel edge 22 gradually decreases from the root to the edge. The root of the transition chisel edge 22 is relatively thick, which can withstand a large cutting force and is conducive to enhancing its structural strength to adapt to large feed processing. At the same time, the inclined side of the transition chisel edge 22 is part of the chip removal port 23, which guides the waste chips.

[0026] In addition, the cutter head 2 is provided with a CVD coating or a PVD coating. The PVD coating is a process in which a gaseous or vaporous coating material is deposited on the surface of the milling cutter under a vacuum environment to form a dense coating. The PVD coating may be TiN, TiAlN, CrN, etc.; the CVD coating decomposes a specific gas at a high temperature to generate active species, causing a chemical reaction on the surface of the milling cutter to form a dense coating. The CVD coating may be TiC, TiCN, Al2O3, etc. By forming a special coating on the surface of the milling cutter, the hardness, wear resistance, corrosion resistance and other properties of the milling cutter can be significantly improved, thereby extending the service life of the milling cutter and improving cutting efficiency.

[0027] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A high feed surface milling cutter, characterized in that: It comprises a knife handle (1) and a knife head (2), wherein the knife head (2) is arranged at one end of the knife handle (1), and the end of the knife head (2) is spherical; The cutter head (2) comprises a main cutting portion and a side cutting portion, the main cutting portion is provided with an end chip removal groove (3), the side cutting portion is provided with a side chip removal groove (4), and the main chip removal groove (3) is communicated with the side chip removal groove (4); The main cutting portion comprises four main cutting edges (21) and a transition chisel edge (22); the main chip groove (3) is located on two adjacent main cutting edges (21); the main cutting edges (21) are evenly distributed at the end of the cutter head (2) in the form of a spiral surface; the transition chisel edge (22) is connected to a group of opposite main cutting edges (21); the tips of the other group of main cutting edges (21) and the transition chisel edge (22) form a chip removal opening (23) leading to the main chip grooves (3) on both sides; The side cutting portion comprises four side cutting edges (24), the side cutting edges (24) being smoothly connected to the main cutting edge (21), the side chip groove (3) being located between two adjacent side cutting edges (24), and the side chip groove (3) extending in a spiral shape to the tool handle (1).

2. A high feed surface milling cutter according to claim 1, characterized in that: The side cutting edges (24) are distributed in a spiral shape, and the spiral angle of the side cutting edges (24) is 30° to 40°.

3. A high feed surface milling cutter according to claim 1, characterized in that: The main chip removal groove (3) comprises a first chip removal surface (31) and a second chip removal surface (32), the edge of the first chip removal surface (31) is connected to the second chip removal surface (32), the first chip removal surface (31) is an outwardly convex spherical surface, and the second chip removal surface (32) is an inwardly concave spherical surface.

4. A high feed surface milling cutter according to claim 3, characterized in that: The top surface of the first chip removal groove (31) is transitionally connected to the chip removal opening (23), one side surface is connected to the root of one side of the cutting edge of the main cutting edge (21), the other side surface is respectively connected to the second chip removal surface (32) and the side chip removal groove (4), and the bottom surface of the first chip removal groove (31) is transitionally connected to the side chip removal groove (4).

5. A high feed surface milling cutter according to claim 4, characterized in that: The second chip removal surface (32) is a concave three-sided spherical surface, the bottom surface of which is connected to the side chip removal groove (4), and the other side surface smoothly transitionally connects the back of the main cutting edge (21) and the back of the side cutting edge (24).

6. A high feed surface milling cutter according to claim 1, characterized in that: The knife handle (1) and the knife head (2) are integrally formed of a titanium alloy material; a chip guide portion (11) is provided at the connection between the knife handle (1) and the knife head (2); and the chip guide portion (11) is in communication with a side chip discharge groove (4).

7. The high feed surface milling cutter according to claim 1, characterized in that: The thickness of the transition chisel edge (22) gradually decreases from its root to its edge.

8. The high feed surface milling cutter according to claim 1, characterized in that: The cutter head (2) is provided with a CVD coating or a PVD coating.

Images