Multi-edge ball-end milling cutter

Abstract

The utility model discloses a multi-cutting-edge ball-end milling cutter, which relates to the technical field of lathe milling cutters and comprises a cutter handle rotating by taking a rotating axis as a center and a cutter head with a ball head part at the front end, and the cutter head comprises a main body and three or more cutting edges, the multiple cutting edges are evenly distributed and connected to the outer side wall of the body in an annular array with the rotation axis as the center, each cutting edge is of an arch-shaped structure, the middle section of each cutting edge is a large arc face of 80-90 degrees, the two ends of each cutting edge are small arc faces of 40-50 degrees, and the two sides of each cutting edge are both provided with cutting edges. The cutting edges are arranged on the two sides of the arc face of the cutting edge, so that after the ball-end milling cutter rotates forwards, the concave face of the cutting edge makes contact with a workpiece to effectively remove protrusions of the workpiece, and after the ball-end milling cutter rotates backwards, the convex face of the cutting edge makes contact with the workpiece to flatly cut the workpiece. And only workpieces in a single condition can be processed, and functionality is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe milling cutter technical field, concretely is a multi -blade ball head milling cutter. BACKGROUND

[0002] Ball head milling cutter is a kind of cutting tool widely used in metal processing, die manufacturing, precision machining and three-dimensional curved surface machining.Compared with traditional flat blade milling cutter, the cutting edge of ball head milling cutter is spherical, can carry out more complex cutting in three-dimensional space, so as to process more complex geometric shape.The main feature of ball head milling cutter is that the cutting edge has spherical curvature, can be used for various precision machining, especially in the machining process requiring high surface quality and high precision, shows its unique advantage.

[0003] Ball head milling cutter is composed of handle and head, the head part is spherical, can contact with workpiece surface and carry out cutting.The working principle of ball head milling cutter is to realize cutting machining by the rotation of tool and the relative motion with workpiece.Due to the spherical design of cutting edge, ball head milling cutter is especially suitable for curved surface machining, such as die forming, carving, 3D curve machining, etc.

[0004] But the cutting edge of the head of the existing ball head milling cutter mostly only has one cutting edge, can only handle single situation workpiece, and the functionality is low, in order to solve the above-mentioned problems, the present application provides a multi-blade ball head milling cutter. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a multi-blade ball head milling cutter to solve the problems in the above background.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a multi-blade ball head milling cutter, including the handle that has the rotation center with the rotation axis, the head with the ball head part in the front end;

[0007] The head includes main body and three pieces and more cutting edges, and the plurality of cutting edges are evenly arranged and connected on the outer side wall of the main body in the form of annular array with the rotation axis as the center;

[0008] The cutting edge is in the shape of arch, the middle section of the cutting edge is a large arc surface of 80 to 90 degrees, the two ends of the cutting edge are small arc surfaces of 40-50 degrees, and the two sides of the cutting edge are provided as cutting edges.

[0009] As one preferred technical scheme of the utility model, one end of the plurality of cutting edges is smoothly connected.

[0010] As one preferred technical scheme of the utility model, the outer side wall of the handle is provided with a plurality of chip removal grooves at one end, and the chip removal grooves are communicated with the gaps of the two cutting edges.

[0011] As a preferred technical solution of this utility model, the length ratio of the blade head to the handle is between 1:2 and 1:4.

[0012] As a preferred technical solution of this utility model, both the handle and the blade are made of high-speed steel.

[0013] As a preferred technical solution of this utility model, the thickness of the blade is between 0.5 and 1.5 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention utilizes an arc-shaped cutting edge with cutting edges on both sides of the arc surface. When the ball end mill rotates clockwise, the concave surface of the cutting edge contacts the workpiece, effectively removing protrusions. When the ball end mill rotates counterclockwise, the convex surface of the cutting edge contacts the workpiece, allowing for smooth cutting. This solves the problem that most existing ball end mills only have one cutting edge, limiting their functionality to a single type of workpiece. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the ball end mill according to an embodiment of the present utility model;

[0017] Figure 2 This is a front view of the ball end mill according to an embodiment of the present utility model;

[0018] Figure 3 This is a front view of the blade in an embodiment of the present utility model.

[0019] In the diagram: 1. Handle; 2. Blade; 21. Body; 22. Blade; a. Convex surface; b. Concave surface. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-3 This embodiment provides a multi-blade ball end mill, including a shank 1 that rotates around a rotation axis and a cutter head 2 with a ball head at the front end. The shank 1 and the cutter head 2 are made of a single piece of high-speed steel.

[0022] First, select the appropriate high-speed steel material (such as M2, M35, etc. cylinder) as the base material of the cutter. High-speed steel has good wear resistance and thermal stability, and is an ideal choice for making ball end mills. After selecting the material, cut it into the appropriate size for subsequent processing. Among them, the length of the short ball end mill is about 50mm to 75mm, the length of the standard ball end mill is about 75mm to 150mm, and the length of the short ball end mill is about 150mm to 200mm or longer.

[0023] Next is the rough machining stage, which processes the high-speed steel material into the basic shape of the cutter through the lathe and milling machine, and preliminarily removes excess material to form the cutter profile. Then, enter the finishing stage, use CNC grinding machine for fine grinding of the cutter, to ensure the geometric shape and size accuracy of the cutter.

[0024] The shaping of the ball head is a key step in the manufacturing process, and a special grinding machine is usually used to process the cutting edge 22 into a spherical shape to ensure that the radius and angle of the tool head 2 meet the design requirements, and the length ratio of the tool head 2 to the tool handle 1 is between 1:2 and 1:4. After completing the ball head processing, the cutter enters the heat treatment stage, which improves the hardness and toughness of the cutter through quenching and tempering process to ensure its excellent cutting performance at high temperature. The ball end mill after heat treatment needs surface treatment, such as coating treatment (such as titanium nitride coating) to improve wear resistance and oxidation resistance.

[0025] As shown in Figure 1 and Figure 2 , the tool head 2 is processed by lathe, including the main body 21 and the cutting edge 22, the number of cutting edges 22 is set to multiple, and the multiple cutting edges 22 are evenly arranged on the outer side wall of the main body 21 in a ring array centered on the milling cutter rotation axis, and one end of the multiple cutting edges 22 is smoothly connected. In theory, the more the number of cutting edges 22 of the ball end mill, the higher the cutting efficiency and machining accuracy, and each cutting edge 22 can cut independently, thereby dispersing the cutting force and reducing tool wear. However, the more the number of cutting edges 22, the smaller the thickness of the cutting edge 22, and the lower the hardness of the too thin cutting edge 22, which is prone to chipping, cracking and other situations after contacting the workpiece for cutting. Therefore, the thickness of the cutting edge 22 should be set between 0.5 to 1.5mm to ensure that the thickness of the cutting edge 22 is not too thin.

[0026] As shown in Figure 3 , the cutting edge 22 is in an arc structure, that is, the cutting edge 22 is composed of one large arc-shaped edge and two small arc-shaped edges, and the large arc-shaped edge is located between the two small arc-shaped edges. Among them, the large arc-shaped edge in the middle section of the cutting edge 22 is an 80 to 90 degree large arc surface, and the two small arc-shaped edges are a 40-50 degree small arc surface.

[0027] The two sides of the cutting edge 22 are set as cutting edges, as shown in Figure 3As shown, the middle of the cutting edge 22 is flanked by a convex surface a and a concave surface b. When cutting, the rotating ball end mill allows the convex surface a of the cutting edge 22 to contact the workpiece, and the smooth convex surface a can smoothly cut the workpiece to make the workpiece surface smooth. However, the rough workpiece surface will mostly have small protrusions. In order to facilitate the processing of the protrusions on the workpiece surface, the ball end mill can be reversed before cutting the workpiece with the convex surface a of the cutting edge 22, so that the concave surface b of the cutting edge 22 first contacts the workpiece. After the concave surface b contacts the workpiece, it can scrape off the protrusions on the workpiece. Due to the design of the concave surface b, it can remove the small protrusions on the workpiece surface in a scraping manner when it contacts the workpiece surface, avoiding the uneven cutting or leaving a rough surface that may occur when the traditional ball end mill processes irregular surfaces. By using the concave surface b to scrape off the protrusions first and then using the convex surface a to cut smoothly, not only can the surface finish of the workpiece be significantly improved, but also the secondary processing time of the workpiece after machining can be reduced. Especially in the machining of precision molds and parts with high surface quality requirements, this design can effectively reduce the polishing process in the later stage and improve the production efficiency. In addition, this double-sided cutting design allows the ball end mill to more evenly distribute the cutting force during use, reducing local wear and tool damage caused by long-term use of a single surface. Especially when processing hard materials or performing a large amount of machining, the service life of the tool can be extended, thereby reducing the frequency of tool replacement and maintenance costs. This design also improves cutting stability, reduces vibration caused by uneven cutting force, and ensures smooth and high-precision machining.

[0028] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-lip ball end mill characterized by, The utility model relates to a cutting tool, including: A shank (1) which can rotate around a rotating axis, a tool head (2) which has a ball head at the front end; The tool head (2) includes a main body (21) and three or more cutting edges (22), and the multiple cutting edges (22) are evenly arranged in a ring array around the rotating axis and connected to the outer side wall of the main body (21); The cutting edge (22) has an arch structure, the middle section of the cutting edge (22) is a large arc surface of 80-90 degrees, the two ends of the cutting edge (22) are small arc surfaces of 40-50 degrees, and the two sides of the cutting edge (22) are provided with cutting edges.

2. A multi-lip ball end mill according to claim 1, characterized in that: One end of the multiple cutting edges (22) is smoothly connected.

3. A multi-lip ball end mill according to claim 2, wherein: The outer side wall of the shank (1) is provided with multiple chip removal grooves at one end, and the chip removal grooves are in communication with the gaps between the two cutting edges (22).

4. A multi-lip ball end mill according to claim 3, wherein: The length ratio of the tool head (2) to the shank (1) is between 1:2 and 1:

4.

5. A multi-lip ball end mill according to claim 4, wherein: The shank (1) and the tool head (2) are made of high-speed steel.

6. A multi-lip ball end mill according to claim 3, wherein: The thickness of the cutting edge (22) is between 0.5 and 1.5 mm.

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