Spiral corn milling cutter

Abstract

The utility model provides a spiral corn milling cutter. The spiral corn milling cutter comprises a cutter body similar to a circular truncated cone shape or an inverted cone shape, a plurality of arc-shaped edge blades and a plurality of linear edge blades, at least two layers of arc-edge blades are arranged on the side face of the cutter body close to the lower end face from bottom to top, and each layer is arranged in the circumferential direction; the multiple linear-edge blades are arranged on the side face of the cutter body in a climbing mode along multiple spiral lines in the axial direction. The arc-shaped edge blade and the linear edge blade are respectively provided with at least one arc-shaped cutting edge, and one linear cutting edge protrudes outwards relative to the side face of the cutter body. The utility model aims to solve the problem that the spiral corn milling mode is single.

Description

Technical Field

[0001] This utility model belongs to the field of machining tool technology, and in particular relates to a spiral corn milling tool. Background Technology

[0002] In the field of metal processing, the corn end mill, as a high-efficiency roughing tool, is characterized by its multi-flute helical cutting structure design. Specifically, the tool body has 6-8 large-lead helical grooves distributed along the axial direction. Each helical groove is equipped with multiple indexable carbide inserts or welded carbide teeth, forming a stepped cutting layer through the staggered cutting edges. Theoretically, this structure can achieve a single axial depth of cut of 1.5-2 times the tool diameter, significantly improving the material removal rate compared to conventional end mills.

[0003] However, in practical applications, this tool has several inherent drawbacks: First, corn milling cutters are generally used for high-efficiency roughing, resulting in poor surface quality of the machined workpiece. Second, while the rigid helical structure of the tool is beneficial for axial force dispersion, it limits the radial cutting capability, allowing only Z-axis feed for square shoulder milling and preventing contour machining and other similar machining strategies. More importantly, when the depth of cut exceeds 3mm, the superimposed cutting force generated by multiple cutting edges participating simultaneously increases significantly, forcing the machine tool feed rate to be reduced to 60%-80% of conventional machining to prevent vibration. This effectively weakens the tool's advantage of large depth of cut, resulting in low cutting efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to solve the problem of the single processing method of spiral corn milling.

[0005] This application provides a helical corn milling tool, comprising:

[0006] The tool body is approximately frustum-shaped or inverted cone-shaped, and consists of multiple curved cutting edges and straight cutting edges. The multiple curved cutting edges are arranged in at least two layers from bottom to top on the side of the tool body near the lower end face, with each layer arranged circumferentially. The multiple straight cutting edges are arranged in multiple spiral lines along the axial direction on the side of the tool body. Both the curved cutting edges and the straight cutting edges have at least one curved cutting edge and one straight cutting edge that protrude outward relative to the side of the tool body.

[0007] Furthermore, the milling cutter is rotationally symmetrical, and the arc-shaped cutting insert and the straight cutting insert respectively form an arc-shaped cutting profile and a straight cutting profile when rotating around the rotation axis of the milling cutter.

[0008] Specifically, the rotational profile of the straight cutting edge forms an angle α with the axis of rotation, and 75°≤α≤90°. Preferably, α is 78°, 80°, 83°, 85°, or 88°.

[0009] Specifically, the axial height difference between the lower end point of the circular arc blade rotary profile and the lowest point of the circular arc blade rotary profile is H, and the radial distance is W, where W / H = 50-250.

[0010] Specifically, W / H = 160-210. Preferably, W / H = 170, 180, 190, or 200.

[0011] Furthermore, any virtual plane passing through the rotation axis of the milling tool is selected as the cutting section; when the arc-shaped cutting insert rotates around the rotation axis, the arc-shaped projections of the arc-shaped cutting edges of the multiple arc-shaped cutting inserts on the cutting section together form the arc-shaped cutting edge rotation profile; when the straight cutting insert rotates around the rotation axis, the straight projections of the straight cutting edges of the multiple straight cutting inserts on the cutting section together form the straight cutting edge rotation profile.

[0012] Furthermore, the side of the blade body near the lower end face is provided with at least two layers of arc-shaped blade grooves arranged circumferentially from bottom to top, with at least two in each layer. The two adjacent arc-shaped blade grooves in the adjacent layers are staggered in the circumferential direction on the side of the blade body. Multiple spirally ascending straight blade grooves are provided along the circumferential direction of the side of the blade body, forming multiple layers of straight blade grooves in the axial direction, with at least two straight blade grooves in each layer arranged circumferentially. Arc-shaped blades and straight blades are respectively installed in the arc-shaped blade grooves and straight blade grooves.

[0013] The improvements in this application bring the following advantages: An embodiment of this application provides a spiral corn milling tool, which is equipped with an arc-shaped cutting edge near its lower end, making the rotational profile of the cutting edge at the end a large arc. The large arc cutting edge at the bottom can be used for contour machining (such as...). Figure 6 (As shown). Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of a spiral corn milling tool according to an embodiment of this application;

[0015] Figure 2 This is a side view of a spiral corn milling tool according to an embodiment of this application;

[0016] Figure 3 for Figure 2 Enlarged view at point K;

[0017] Figure 4 This is a schematic diagram of the arc-shaped blade in the embodiments of this application;

[0018] Figure 5 This is a schematic diagram of the structure of the straight-edged blade in the embodiments of this application;

[0019] Figure 6This is a schematic diagram illustrating the state of a spiral corn milling tool during contour machining according to an embodiment of this application;

[0020] Figure 7 This is a schematic diagram illustrating the state of a spiral corn milling tool during face milling according to an embodiment of this application;

[0021] Among them, the tool body-1, the arc-shaped cutting edge groove-11, the straight cutting edge groove-12, the side of the tool body-13, the lower end face of the tool body-14, the arc-shaped cutting edge-2, the arc-shaped cutting edge-21, the circular arc cutting edge rotation profile-22, the lower end point of the circular arc cutting edge rotation profile-221, the lowest point of the circular arc cutting edge rotation profile-222, the straight cutting edge-3, the straight cutting edge-31, the straight cutting edge rotation profile-32, the rotation axis-4, and the cutting section-41. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0023] Please see Figure 1-7 This application provides a spiral corn milling tool, which is rotationally symmetrical and has multiple layers of arc-shaped cutting blades 2 with arc-shaped cutting edges 21 at its lower end.

[0024] like Figure 2 As shown in the figure, as an embodiment, it includes: a tool body 1 that is approximately frustum-shaped or inverted cone-shaped, a plurality of arc-shaped cutting blades 2 and straight cutting blades 3; the plurality of arc-shaped cutting blades 2 are provided in at least two layers from bottom to top on the side surface 13 of the tool body near the lower end face 14, and each layer is arranged circumferentially; the plurality of straight cutting blades 3 are arranged in multiple spiral lines along the axial direction on the side surface 13 of the tool body; the arc-shaped cutting blades 2 and the straight cutting blades 3 each have at least one arc-shaped cutting edge 21 and one straight cutting edge 31 that protrude outward relative to the side surface 13 of the tool body.

[0025] like Figure 2As shown in the figure, as an embodiment, it includes: a cutter body 1 that is basically frustum-shaped or inverted cone-shaped, a plurality of arc-shaped cutting blades 2 and a plurality of straight cutting blades 3; the side surface 13 of the cutter body is provided with at least two layers of arc-shaped cutting blade grooves 11 arranged circumferentially from bottom to top near the lower end face, with at least two in each layer, and the two adjacent arc-shaped cutting blade grooves 11 located in adjacent layers are staggered in the circumferential direction of the side surface 13 of the cutter body; a plurality of spirally ascending straight cutting blade grooves 12 are provided along the circumference of the side surface 13 of the cutter body, forming a multi-layer straight cutting blade groove 12 in the axial direction, with at least two straight cutting blade grooves 12 in each layer and arranged circumferentially; the arc-shaped cutting blade grooves 11 are used to install arc-shaped cutting blades 2, and the straight cutting blade grooves 12 are used to install straight cutting blades 3, and the arc-shaped cutting blades 2 and the straight cutting blades 3 each have at least one arc-shaped cutting edge 21 and one straight cutting edge 31 protruding outward relative to the side surface 13 of the cutter body, and respectively forming an arc-shaped cutting edge rotation profile 22 and a straight cutting edge rotation profile 32.

[0026] In this application, axial, radial, and circumferential directions are all relative to the helical corn milling tool.

[0027] like Figure 2 As shown, any virtual plane passing through the rotation axis 4 of the milling tool is selected as the cutting section 41.

[0028] Specifically, when the arc-shaped blade 2 rotates around the rotation axis 4, the arc-shaped cutting edges 21 of the multi-layer arc-shaped blade 2 together form the arc-shaped projection on the cutting section 41 when they pass through the cutting section 41, thus forming the circular arc blade rotation profile 22.

[0029] Similarly, when the straight cutting blade 3 rotates around the rotation axis 4, the straight cutting edge 31 of the multi-layer straight cutting blade 3 passes through the cutting section 41 and its straight projection on the cutting section 41 together forms the straight cutting edge rotation profile 32.

[0030] like Figure 2 As shown in the illustration, in one embodiment, the linear cutting edge rotation profile 32 forms an angle α with the rotation axis 4. α controls the principal cutting edge angle of the tool. Adjusting the principal cutting edge angle allows for adjustments to the force distribution on the tool in the axial and radial directions, as well as the width of the chips. When α is between 0-15°, the tool is primarily subjected to force in the radial direction during use, suitable for face milling of thin-walled workpieces, resulting in a smaller chip width at the same depth of cut ap. When α is between 75-90°, the tool is primarily subjected to force in the axial direction during use, suitable for rapid feed face milling, resulting in a larger chip width at the same depth of cut ap, significantly improving cutting efficiency. α is preferably 80°.

[0031] like Figure 3As shown in the figure, in one embodiment, the axial height difference between the lower end point 221 of the circular arc cutting edge profile and the lowest point 222 of the circular arc cutting edge profile is H, and the radial distance is W, where W / H = 170, 180, 190, 200. Controlling the ratio of W / H constrains the contact position between the bottom of the circular arc cutting edge and the workpiece, which is beneficial to improving the surface quality of the machined surface.

[0032] The lowest point 222 of the circular arc cutting edge's rotary profile is the dividing point. The end furthest from the center of the tool body 1 is the main cutting edge, and the end closer to the center of the tool body 1 is the secondary cutting edge. After the main cutting edge finishes machining the workpiece surface, there will be unmachined residue on the surface. The secondary cutting edge then removes this residue to achieve a finishing effect that improves the quality of the machined surface. The W / H ratio must be controlled within a reasonable range to achieve the desired finishing effect. If the ratio is too small, the secondary cutting edge cannot achieve the desired finishing effect; if the ratio is too large, it will increase the cutting force while finishing, which may cause tool vibration and vibration marks on the workpiece surface, resulting in poor surface quality. Furthermore, the circular arc-shaped secondary cutting edge has a smoother transition than the straight secondary cutting edge, resulting in a better finishing effect.

[0033] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A spiral corn milling tool, characterized in that, include: The blade body is approximately frustum-shaped or inverted cone-shaped, with multiple curved and straight cutting edges; Multiple curved blades are arranged in at least two layers from bottom to top on the side of the cutter body near the lower end face, with each layer arranged circumferentially; multiple straight blades are arranged in multiple spiral lines along the axial direction on the side of the cutter body; both the curved blades and the straight blades have at least one curved cutting edge and one straight cutting edge that protrude outward relative to the side of the cutter body.

2. A spiral corn planing tool according to claim 1, characterized in that The milling cutter is rotationally symmetrical. When the arc-shaped cutting insert and the straight cutting insert rotate around the rotation axis of the milling cutter, they respectively form an arc-shaped cutting profile and a straight cutting profile.

3. A spiral corn planing tool according to claim 2, wherein, The straight blade's rotary profile forms an angle α with the rotation axis, and 75°≤α≤90°.

4. A spiral corn planing tool according to claim 2, wherein, The axial height difference between the lower end point of the circular arc blade rotary profile and the lowest point of the circular arc blade rotary profile is H, and the radial distance is W, where W / H = 50-250.

5. A spiral corn planing tool according to claim 4, wherein, W / H = 160-210.

6. A spiral corn planing tool according to claim 2, wherein, Choose any virtual plane passing through the rotation axis of the milling tool as the cutting section; when the arc-shaped cutting insert rotates around the rotation axis, the arc-shaped projections of the arc-shaped cutting edges of the multiple arc-shaped cutting inserts on the cutting section together form the arc-shaped cutting edge rotation profile; when the straight cutting insert rotates around the rotation axis, the straight cutting edges of the multiple straight cutting inserts on the cutting section together form the straight cutting edge rotation profile.

7. A spiral corn milling cutter according to any one of claims 1 to 6, wherein, The side of the blade body near the lower end face has at least two layers of arc-shaped blade grooves arranged circumferentially from bottom to top, with at least two grooves in each layer. The two adjacent arc-shaped blade grooves in the adjacent layers are staggered in the circumferential direction on the side of the blade body. Multiple spirally ascending straight blade grooves are provided along the circumferential direction of the side of the blade body, forming multiple layers of straight blade grooves in the axial direction, with at least two straight blade grooves in each layer arranged circumferentially. Arc-shaped blades and straight blades are respectively installed in the arc-shaped blade grooves and straight blade grooves.

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