An eight-blade shoulder milling cutter

Abstract

The utility model discloses a kind of eight-blade square shoulder milling cutter of vertical installation, including blade main body, the blade main body is cubic structure, blade main body includes cutting edge, bottom locating surface, side locating surface and blade band, the cutting edge is evenly arranged along the bottom locating surface perimeter side, blade band is formed along the length direction of the cutting edge, adjacent cutting edge is connected by tool tip circular arc transition, the tool tip circular arc is arranged at the four corners of blade main body;The side locating surface both sides are provided with chip groove;Screw hole is arranged at the geometric center of the bottom locating surface;The blade main body is pressed up and down by punch along bottom locating surface direction, is pressed by multidirectional forming along the side locating surface direction.This utility model is simple in structure, and the cutting precision of blade is easy to control, guarantees the stability and quality of milling machining.

Description

Technical Field

[0001] This utility model belongs to the field of square shoulder end mill technology, and in particular, relates to a vertically mounted eight-flute square shoulder end mill. Background Technology

[0002] A square shoulder end mill is a milling cutter with a 90° principal cutting edge angle, enabling true 90° flat sidewall machining. This unique design gives it advantages such as economy, flexibility, and reliability. Square shoulder end mills mainly include two types: square shoulder end mills and square shoulder face mills.

[0003] Modern square shoulder end mills incorporate innovative designs, such as the vertical and horizontal insert combination design of the Wold FMP-LN sleeve-type square shoulder end mill. This design achieves a precise 90° principal cutting edge angle, enabling efficient machining of cavities with bottom surfaces and vertical sidewalls. The cutter body is typically made of high-strength forged alloy steel, and the mounting portion is machined in a single setup using a high-precision five-axis machining center. While square shoulder end mills offer numerous advantages in terms of economy, flexibility, and reliability, they still have some significant limitations in practical applications. When using square shoulder end mills for full-cut groove milling, chip removal can be problematic, especially in deep groove machining. Existing square shoulder end mills have complex structures, and the cutting edge and locating surface are prone to deformation, making accuracy control difficult.

[0004] Patent application CN221983981U discloses a double-sided, eight-flute indexable square shoulder milling cutter insert, comprising an insert body that is matched and mounted to a milling cutter shank or milling cutter disc. The insert body has a cuboid-like structure, and four cutting edges are provided on both the front and back mounting surfaces of the insert body. The cutting edges on the front and back mounting surfaces are axially symmetrically distributed along the central axis of the symmetry plane of the front and back mounting surfaces. Each cutting edge includes a main cutting edge and a finishing edge. A tool tip arc is provided at the transition between the main cutting edge and the finishing edge, and a groove is provided at the connection between the finishing edge of the cutting edge and the main cutting edge of the adjacent cutting edge. A mounting hole is provided in the middle of the insert body. The multi-edge, multi-curved surface, and high-precision structure of this milling cutter places extremely high precision requirements on the machining equipment (such as grinding and forming processes), and its complex structure increases manufacturing difficulty and production costs. Utility Model Content

[0005] This invention addresses the challenges of existing square-shoulder end mills, which suffer from complex structures, easily deformable cutting edges and locating surfaces, leading to difficulty in precision control. Furthermore, when using square-shoulder end mills for full-cut milling, chip removal is often impaired, particularly in deep groove machining. This invention proposes a vertically mounted eight-flute square-shoulder end mill.

[0006] A vertically mounted eight-flute square shoulder end mill includes a insert body with a cubic structure. The insert body includes a cutting edge, a bottom locating surface, side locating surfaces, and a cutting edge band. The cutting edges are evenly distributed along the periphery of the bottom locating surface, forming a cutting edge band along the length of the cutting edges. Adjacent cutting edges are connected by a tip arc, which is located at the four corners of the insert body. Chip grooves are provided on both sides of the side locating surface. A screw hole is located at the geometric center of the bottom locating surface. The insert body is pressed vertically along the bottom locating surface by a punch and pressed in a multi-directional forming manner along the side locating surfaces. The bottom locating surface is the plane containing the screw hole, perpendicular to the axis of the insert body; the side locating surfaces are distributed along the periphery of the insert body.

[0007] Furthermore, the blade tip arc is formed by grinding, and its back angle has a tapered structure.

[0008] Furthermore, the side positioning surface is formed by a four-way multi-directional molding pressing method.

[0009] Furthermore, the chip groove is located between the cutting edge and the side positioning surface, extending along the side of the blade body, and is used to accommodate the chips generated during the cutting process.

[0010] Furthermore, the inner wall of the chip groove is curved, and this curved surface is directly formed by a four-way multi-directional forming pressing process.

[0011] Furthermore, the blade body is provided with eight cutting edges, the number of which is the same as the number of chip grooves, with each chip groove corresponding to one cutting edge.

[0012] Furthermore, the cutting edge band is connected to the cutting edge and integrally formed, and the width of the cutting edge band is 0.1 to 0.2 mm, which is used to enhance the strength of the cutting edge and the machining stability.

[0013] Furthermore, the rake angle of the blade body is 15°.

[0014] Furthermore, the side positioning surface is 0.05 to 0.15 mm higher than the cutting edge of the cutting edge.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model includes a blade body, which has a cubic structure. The blade body includes a cutting edge, a bottom positioning surface, a side positioning surface, and a cutting edge band. The cutting edge is evenly distributed along the periphery of the bottom positioning surface, forming a cutting edge band along the length of the cutting edge. Adjacent cutting edges are connected by a tool tip arc transition, and the tool tip arc is located at the four corners of the blade body. Chip grooves are provided on both sides of the side positioning surface. A screw hole is provided at the geometric center of the bottom positioning surface. This utility model has a simple structure. By optimizing the forming method, the bottom positioning surface is pressed up and down by a punch, and the side positioning surface is formed and pressed in a four-way multi-directional manner, reducing the deformation risk caused by structural complexity. This makes the precision of the blade easier to control, ensuring the stability of milling (especially square shoulder milling) and the high quality of the machined workpiece.

[0016] 2. This utility model features eight cutting edges. When one cutting edge wears out, the screw can be loosened, and the insert can be rotated to another unused cutting edge to continue working until all eight cutting edges are worn out. This greatly improves the utilization rate of the insert, reduces the frequency of tool changes, and lowers the user's tool usage costs. The chip grooves designed between the cutting edges of the insert provide ample chip removal space, ensuring smooth chip discharge during the cutting process. This effectively avoids problems such as insert damage and decreased machining quality caused by chip clogging, thus improving the reliability and efficiency of machining. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the chip groove structure of this utility model; In the above figure, 1. cutting edge; 2. bottom positioning surface; 3. side positioning surface; 4. cutting edge; 5. chip groove; 6. screw hole; 7. tool tip arc. Detailed Implementation

[0018] To clearly illustrate the technical features of this utility model, the following detailed description, in conjunction with the accompanying drawings, provides a comprehensive overview of the present utility model. Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present utility model is not limited to the specific embodiments disclosed below. Furthermore, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the present utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" and "second" can explicitly or implicitly include one or more of those features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In this utility model, unless otherwise explicitly specified and limited, "on" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0019] Example 1 like Figure 1 and Figure 2As shown, a vertically mounted eight-flute square shoulder end mill includes a insert body with a cubic structure. The insert body includes a cutting edge 1, a bottom positioning surface 2, a side positioning surface 3, and a cutting edge 4. The cutting edge 1 is evenly arranged along the periphery of the bottom positioning surface 2, and the cutting edge 4 is formed along the length direction of the cutting edge 1. Adjacent cutting edges 1 are connected by a tip arc 7, which is located at the four corners of the insert body. Chip grooves 5 are provided on both sides of the side positioning surface 3. A screw hole 6 is provided at the geometric center of the bottom positioning surface 2. The insert body is pressed up and down along the bottom positioning surface 2 by a punch and pressed in a multi-directional forming manner along the side positioning surface 3.

[0020] In this embodiment, the blade body is made of cemented carbide and manufactured using powder metallurgy, exhibiting a cubic structure. The blade body comprises eight cutting edges 1, evenly distributed along the periphery of the bottom positioning surface 2, with adjacent cutting edges 1 connected by a tip arc 7. The tip arc 7 is formed by precision grinding and located at the four corners of the blade body, with a 10° taper structure to effectively reduce cutting impact. A 0.15mm wide cutting edge band 4 is provided along the length of the cutting edge 1, integrally formed with the cutting edge 1, enhancing both the edge strength and ensuring the smoothness of the machined surface.

[0021] The side positioning surface 3 is 0.1 mm higher than the cutting edge 1 and is formed by a four-way multi-directional forming pressing process. The four side positioning surfaces 3 (located around the edges of the blade) are precise planes and perpendicular to the bottom positioning surface 2, together forming the positioning reference of the blade in the cutter head groove, ensuring extremely high repeatability after installation. Eight chip grooves 5 are symmetrically arranged on both sides of the side positioning surface 3, each corresponding to a cutting edge 1, located between the cutting edge 1 and the side positioning surface 3 and extending along the side of the blade. The inner wall of the chip groove 5 is a smooth curved surface, directly formed by a four-way multi-directional forming pressing process without subsequent processing; its groove depth gradually increases from the side closer to the cutting edge 1 (depth 1.2 mm) to the side closer to the side positioning surface 3 (depth 2.5 mm), adapting to the curling and discharge path of chips during cutting and avoiding chip accumulation.

[0022] like Figure 1 As shown, a screw hole 6 penetrating the insert body is provided at the geometric center of the bottom positioning surface 2 for fixing the insert to the cutter body. After assembly, the rake angle of the insert remains at 15°, meeting the high-efficiency cutting requirements of general-purpose metal materials. The insert body is pressed up and down along the bottom positioning surface 2 by a punch, and pressed in a multi-directional forming process along the side positioning surface 3, ensuring the accuracy and strength of the overall structure.

[0023] The cutting tool of this embodiment has the advantages of compact structure, good rigidity, high positioning accuracy and smooth chip removal, and is particularly suitable for square shoulder milling of steel and cast iron.

[0024] Example 2 like Figure 1 and Figure 2 As shown, a vertically mounted eight-flute square shoulder end mill includes a insert body with a cubic structure. The insert body includes a cutting edge 1, a bottom positioning surface 2, a side positioning surface 3, and a cutting edge 4. The cutting edge 1 is evenly arranged along the periphery of the bottom positioning surface 2, and the cutting edge 4 is formed along the length direction of the cutting edge 1. Adjacent cutting edges 1 are connected by a tip arc 7, which is located at the four corners of the insert body. Chip grooves 5 are provided on both sides of the side positioning surface 3. A screw hole 6 is provided at the geometric center of the bottom positioning surface 2. The insert body is pressed up and down along the bottom positioning surface 2 by a punch and pressed in a multi-directional forming manner along the side positioning surface 3.

[0025] There are eight chip grooves 5, corresponding to the eight cutting edges 1. To optimize the machining performance of sticky, long-chipping materials such as stainless steel, this embodiment features specially designed chip grooves with increased volume and more significant variations in groove depth, thus providing a more spacious chip removal area and effectively avoiding chip entanglement and clogging problems that easily occur when machining stainless steel. Specifically, the groove depth near the cutting edge 1 is 1.5 mm, and the groove depth near the side positioning surface 3 is 3 mm. The curved inner wall is polished to reduce chip removal resistance. A 0.5 mm arc transition is provided at the connection between the chip groove 5 and the cutting edge 4 to prevent chips from getting stuck at corners.

[0026] The screw hole 6 at the geometric center of the bottom positioning surface 2 has a diameter of 6mm, and the pressing method of the insert body is the same as in Embodiment 1. The milling cutter of this embodiment is suitable for milling larger workpieces and can meet the requirements of high cutting efficiency.

[0027] Example 3 like Figure 1 and Figure 2 As shown, a vertically mounted eight-flute square shoulder end mill includes a insert body with a cubic structure. The insert body includes a cutting edge 1, a bottom positioning surface 2, a side positioning surface 3, and a cutting edge 4. The cutting edge 1 is evenly arranged along the periphery of the bottom positioning surface 2, and the cutting edge 4 is formed along the length of the cutting edge 1. Adjacent cutting edges 1 are connected by a tip arc 7, which is located at the four corners of the insert body. Chip grooves 5 are provided on both sides of the side positioning surface 3. A screw hole 6 is provided at the geometric center of the bottom positioning surface 2. The insert body is pressed up and down along the bottom positioning surface 2 by a punch and pressed along the side positioning surface 3 by multi-directional forming.

[0028] In this embodiment, the blade body is made of an ultra-fine grain cemented carbide substrate coated with an AlTiN coating. The cube has a side length of 12mm to ensure the sharpness of the cutting edge and the surface quality. The tip arc 7 has a radius of 0.5mm and is machined by ultra-precision grinding (roundness error ≤0.002mm). Its back angle is tapered to ensure the right angle accuracy of the square shoulder machining. The width of the cutting edge 4 is reduced to 0.1mm to reduce scratches on the machined surface.

[0029] The side locating surface 3 is only 0.1mm higher than the cutting edge 1. Through high-precision four-way multi-directional forming and pressing, its flatness error is ≤0.003mm, and the positioning clearance with the tool body is ≤0.005mm. The depth gradient of the eight chip grooves 5 is gentle, and the depth on the side closer to the cutting edge 1 is less than the depth on the side closer to the side locating surface 3. The curved inner wall of the chip grooves 5 adopts a contour-following design to meet the requirements for the discharge of small chips in precision machining.

[0030] Screw hole 6 features a stepped design, which, combined with a special high-strength screw, allows for micro-preload of the insert, preventing assembly stress from affecting machining accuracy. The insert rake angle is 15°, ensuring smooth cutting and making it suitable for precision square shoulder machining of mold cavities.

[0031] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A vertically mounted eight-flute square shoulder end mill, comprising a insert body, characterized in that, The blade body has a cubic structure and includes a cutting edge, a bottom positioning surface, a side positioning surface, and a cutting edge band. The cutting edge is evenly distributed around the periphery of the bottom positioning surface, forming a cutting edge band along the length of the cutting edge. Adjacent cutting edges are connected by a blade tip arc, which is located at the four corners of the blade body. Chip grooves are provided on both sides of the side positioning surface. A screw hole is provided at the geometric center of the bottom positioning surface. The blade body is pressed up and down by a punch along the bottom positioning surface and pressed by multi-directional forming along the side positioning surface.

2. The vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The blade tip arc is formed by grinding, and its back angle is a tapered structure.

3. A vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The side positioning surface is formed by a four-way multi-directional molding and pressing method.

4. A vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The chip groove is located between the cutting edge and the side positioning surface, and extends along the side of the blade body to accommodate the chips generated during the cutting process.

5. A vertically mounted eight-flute square shoulder end mill according to claim 4, characterized in that, The chip groove is connected to one end of the cutting edge, and the depth of the chip groove gradually increases from the side closer to the cutting edge to the side closer to the positioning surface, in order to adapt to the chip discharge path during the cutting process.

6. A vertically mounted eight-flute square shoulder end mill according to claim 4, characterized in that, The inner wall of the chip groove is curved, and the curved surface is directly formed by a four-way multi-directional forming pressing process.

7. A vertically mounted eight-flute square shoulder end mill according to claim 4, characterized in that, The blade body is provided with eight cutting edges, the number of which is the same as the number of chip grooves, with each chip groove corresponding to one cutting edge.

8. A vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The cutting edge band is connected to the cutting edge and integrally formed. The width of the cutting edge band is 0.1 to 0.2 mm, which is used to enhance the strength of the cutting edge and the machining stability.

9. A vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The front angle of the blade body is 15°.

10. A vertically mounted eight-flute square shoulder end mill according to claim 1, characterized in that, The side positioning surface is 0.05 to 0.15 mm higher than the cutting edge of the cutting edge.

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