Stepped corn kernel cutter

Abstract

The utility model provides a kind of stepped corn kernel milling cutter, including handle and tool bit;And infusion hole being set through in handle and tool bit;The tool bit is provided with chip flute group;The chip flute group includes first unit chip flute group and second unit chip flute group;The first unit chip flute group includes one first chip flute and multiple second chip flutes, which are arranged in a spiral step distribution from the end of tool bit to tail part;The second unit chip flute group includes multiple second chip flutes, which are arranged in a spiral step distribution from the front of tool bit to tail part;Milling cutter teeth are respectively arranged in the first chip flute and the second chip flute.The first unit chip flute group is specially used for end chip accumulation area, the second unit chip flute group expands chip space, forms partitioned and graded chip removal channel, improves the chip removal effect of tool body, and the two groups of chip flutes are staggered around the center axis of tool bit, and are both arranged in central symmetry, which can realize self-balancing of cutting force and avoid radial vibration.

Description

Technical Field

[0001] This utility model belongs to the field of milling cutter technology, and more specifically, it relates to a stepped corn kernel milling cutter. Background Technology

[0002] Corn kernel milling cutters (also known as corn end mills or wave-edge milling cutters) are high-efficiency roughing tools widely used in mold manufacturing, aerospace, energy equipment, and other fields, and are particularly suitable for milling large-mass metal materials. Their core advantage lies in their chip-splitting design, which breaks down the entire cutting edge into multiple smaller, staggered cutting units (wave-edges). This structure effectively reduces cutting forces, lowers cutting heat, improves chip removal performance, and significantly increases machining efficiency and tool life.

[0003] However, in traditional corn kernel end mills, during deep-cavity, long-stroke, or high-feed roughing operations, the chip evacuation grooves typically extend continuously in a spiral along the tool body axis. In high-intensity roughing, the large volume and complex shape of chips easily lead to entanglement, accumulation, and interference within the continuous chip evacuation grooves. This not only hinders the effective removal of subsequent chips and increases friction and heat accumulation in the cutting zone, but can also cause increased tool vibration, deterioration of the machined surface quality, and even failures such as chipping or breakage.

[0004] While some improved kernel end mills have attempted to incorporate stepped chip evacuation structures to improve chip removal, the layout and synergy of their chip evacuation grooves are often not optimized. A common problem is that the distribution of the chip evacuation grooves is not reasonable enough, failing to effectively guide chips away from the cutting zone quickly along the optimal path. This limits further improvements in chip removal efficiency. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a stepped corn kernel end mill, which solves the problems of unreasonable groove allocation, resulting in low chip removal efficiency and increased tool vibration in existing corn kernel end mills.

[0006] A stepped corn kernel milling cutter includes a shank and a cutter head; and an infusion hole penetrating the shank and the cutter head; the cutter head is provided with a chip removal groove group; the chip removal groove group includes a first unit chip removal groove group and a second unit chip removal groove group; the first unit chip removal groove group includes a first chip removal groove and a plurality of second chip removal grooves arranged in a spiral stepped manner from the end of the cutter head to the tail; the second unit chip removal groove group includes a plurality of second chip removal grooves arranged in a spiral stepped manner from the front of the cutter head to the tail; the first unit chip removal groove group and the second unit chip removal groove group are each provided in two, and are arranged alternately around the center of the cutter head; milling cutter teeth are respectively provided in the first chip removal groove and the second chip removal groove.

[0007] Furthermore, the first unit chip removal groove group is configured as two, namely the first unit chip removal groove group A and the first unit chip removal groove group B; the first unit chip removal groove group A and the first unit chip removal groove group B are centrally symmetrical about the central axis of the cutter head; the second unit chip removal groove group is configured as two, namely the second unit chip removal groove group A and the second unit chip removal groove group B; the second unit chip removal groove group A and the second unit chip removal groove group B are centrally symmetrical about the central axis of the cutter head.

[0008] Furthermore, the first chip removal groove and the second chip removal groove are composed of a chip removal surface and a mounting surface; the chip removal surface is set as a curved surface, and the mounting surface is set as a straight surface; a tooth mounting groove is provided on the mounting surface, and the milling cutter teeth are fixedly mounted in the tooth mounting groove.

[0009] Furthermore, the tail curved surface of the chip removal surface is bent in the same direction as the diameter of the cutting head.

[0010] Furthermore, the tooth mounting groove in the first chip removal groove is set as a quarter-elliptical structure; the tooth mounting groove in the second chip removal groove is set as a half-elliptical structure; the front end of the milling cutter tooth located in the first chip removal groove extends beyond the end of the cutter head to form an end tooth cutting edge; the milling cutter tooth extends beyond the outer edge of the cutter head to form an outer diameter cutting edge.

[0011] Furthermore, the milling cutter teeth are configured to correspond in shape with the tooth mounting groove.

[0012] Furthermore, the end of the cutter head is provided with a chamfered edge, the inclination direction of which is perpendicular to the first unit chip removal groove group, and the inclination angle is 45°.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) By setting the first chip removal groove group to target the end chip accumulation area and the second chip removal groove group to expand the chip space, a partitioned and graded chip removal channel is formed to improve the chip removal effect of the tool body. At the same time, the two chip removal grooves are staggered around the central axis of the tool head and both adopt a central symmetrical layout, which can achieve self-balance of cutting force and avoid radial vibration.

[0015] (2) By setting the chip removal groove as a curved chip removal surface and a straight mounting surface, the curved chip removal surface guides the chips to curl and detach in a directional manner, while the straight surface provides a high-rigidity cutter tooth base; at the same time, bending the tail of the chip removal surface to the diameter direction of the cutter head can force the chips to be thrown out radially, reducing axial residue.

[0016] (3) By making the first chip removal groove tooth mounting groove a 1 / 4 ellipse and the second chip removal groove a 1 / 2 ellipse, the 1 / 4 ellipse groove strengthens the torsional strength of the end teeth and the 1 / 2 ellipse groove increases the heat dissipation area; the milling cutter teeth match the full profile of the mounting groove and the cutting edge of the end teeth extends beyond the end of the cutter head, which can ensure that the cutting edges are coplanar and reduce the fluctuation of cutting force. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the end mill structure;

[0018] Figure 2 This is a schematic diagram of the milling cutter from another angle.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1-Tool holder, 2-Tool head, 21-First unit chip removal groove group A, 22-Second unit chip removal groove group A, 23-First unit chip removal groove group B, 24-Second unit chip removal groove group B, 201-First chip removal groove, 202-Second chip removal groove, 31-Chip removal surface, 32-Mounting surface, 33-Tool tooth mounting groove, 4-Milling cutter tooth, 5-Beveled chamfer, 6-Infusion hole. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and 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 this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example:

[0025] like Figures 1-2 As shown, a stepped corn kernel milling cutter includes a shank 1 and a cutter head 2; and an infusion hole 6 that penetrates both the shank 1 and the cutter head 2; the shank and the cutter head are integrally formed. The infusion hole 6 penetrates both the shank and the cutter head, and its inner wall is mirror-polished to reduce fluid resistance.

[0026] The cutter head 2 is provided with a chip removal groove group; the chip removal groove group includes a first unit chip removal groove group and a second unit chip removal groove group; the first unit chip removal groove group includes a first chip removal groove 201 and a plurality of second chip removal grooves 202 arranged in a spiral step distribution from the end of the cutter head 2 to the tail; specifically, the second chip removal groove 202 is preferably set to two, and the three chip removal grooves start from the end of the cutter head and extend to the tail in a spiral step with a spiral angle of 35°;

[0027] The second unit chip removal groove group includes a plurality of second chip removal grooves 202 arranged in a spiral step distribution from the front part to the tail of the cutter head 2; specifically, there are three second chip removal grooves 202, starting from half the length of the end of the chip removal groove at the front of the cutter head and extending to the tail in a spiral step with a spiral angle of 35°; wherein the individual chip removal grooves in the second unit chip removal groove group and the first unit chip removal groove group are arranged alternately.

[0028] The first chip removal groove group and the second chip removal groove group are each set to two, and are arranged to alternately surround the center of the cutter head 2; the first chip removal groove 201 and the second chip removal groove 202 are respectively provided with milling cutter teeth 4.

[0029] To enhance the chip removal function of the chip removal grooves, the first chip removal groove 201 and the second chip removal groove 202 are composed of a chip removal surface 31 and a mounting surface 32. The chip removal surface 31 is curved, and the mounting surface 32 is flat. The chip removal surface 31 is curved with a gradually changing radius of curvature, and the tail bends towards the radial direction. The mounting surface 32 is planar ground, and a wear-resistant coating is deposited on its surface to enhance wear resistance. The curved chip removal surface guides the chips to detach along the normal direction, reducing chip residue, while the flat mounting surface provides the rigidity of the cutting teeth.

[0030] The mounting surface 32 is provided with a tooth mounting groove 33, and the milling cutter tooth 4 is fixedly mounted in the tooth mounting groove 33. Specifically, the tooth mounting groove 33 in the first chip removal groove 201 is set as a quarter elliptical structure; the tooth mounting groove 33 in the second chip removal groove 202 is set as a half elliptical structure.

[0031] In this design, the milling cutter teeth 4 are shaped to correspond with the tooth mounting groove 33. The front end of the milling cutter teeth 4 located in the first chip removal groove 201 extends beyond the end of the cutter head 2 to form an end tooth cutting edge; the milling cutter teeth 4 extend beyond the outer edge of the cutter head 2 to form an outer diameter cutting edge.

[0032] The end of the cutter head 2 is provided with a chamfered edge 5, the inclination direction of which is perpendicular to the first unit chip removal groove group, and the inclination angle is 45°. The chamfered structure can block the crack propagation path and improve the impact resistance; at the same time, the vertical layout with the chip removal groove avoids stress concentration and superposition.

[0033] The working process of this milling cutter:

[0034] The high-pressure cooling pump drives the cutting fluid to be sprayed out through the fluid inlet 6, covering the cutting edge area of ​​the end of the milling cutter; the end face cuts into the cutting edge, and the cutting edge of the end tooth of the first chip removal groove 201 contacts the workpiece first, realizing the axial depth of cut; the chips curl along the curved surface of the chip removal surface 31 and are guided radially out by the tail bending structure.

[0035] The second chip removal groove 202 participates in cutting sequentially, forming a chip-splitting wave-shaped edge; the first unit groove group 21, 23 and the second unit groove group 22, 24 alternately divert chips, reducing chip entanglement. The symmetrically distributed chip removal groove group makes the radial resultant force ΣFy≈0, achieving radial balance and reducing tool body vibration. The chamfer 5 absorbs the impact energy of intermittent cutting.

[0036] The chips move along the spiral channel of the stepped groove towards the tool holder and eventually leave the machining area.

[0037] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A stepped corn kernel milling cutter, characterized in that, include: The blade handle (1) and the blade head (2); and the infusion hole (6) through the blade handle (1) and the blade head (2); the blade head (2) is provided with a chip removal groove group; the chip removal groove group includes a first unit chip removal groove group and a second unit chip removal groove group; The first unit chip removal groove group includes a first chip removal groove (201) and a plurality of second chip removal grooves (202) arranged in a spiral step distribution from the end of the cutter head (2) to the tail. The second unit chip removal groove group includes multiple second chip removal grooves (202) arranged in a spiral step distribution from the front part to the tail part of the cutter head (2); The first unit chip removal groove group and the second unit chip removal groove group are each set to two, and are arranged to alternately surround the center of the cutter head (2); The first chip removal groove (201) and the second chip removal groove (202) are respectively provided with milling cutter teeth (4).

2. The stepped corn kernel milling cutter according to claim 1, characterized in that, The first unit chip removal groove group is set to two, namely the first unit chip removal groove group A (21) and the first unit chip removal groove group B (23); the first unit chip removal groove group A (21) and the first unit chip removal groove group B (23) are centrally symmetrical about the central axis of the cutter head (2); The second unit chip removal groove group is set to two, namely the second unit chip removal groove group A (22) and the second unit chip removal groove group B (24); the second unit chip removal groove group A (22) and the second unit chip removal groove group B (24) are centrally symmetrical about the central axis of the cutter head (2).

3. A stepped corn kernel milling cutter according to claim 1, characterized in that, The first chip removal groove (201) and the second chip removal groove (202) are composed of a chip removal surface (31) and a mounting surface (32); the chip removal surface (31) is set as a curved surface, and the mounting surface (32) is set as a straight surface; a tooth mounting groove (33) is provided on the mounting surface (32), and the milling cutter tooth (4) is fixedly installed in the tooth mounting groove (33).

4. A stepped corn kernel milling cutter according to claim 3, characterized in that, The tail curved surface of the chip removal surface (31) is bent and coincides with the diameter direction of the cutter head (2).

5. A stepped corn kernel milling cutter according to claim 3, characterized in that, The tooth mounting groove (33) in the first chip removal groove (201) is set as a quarter elliptical structure; the tooth mounting groove (33) in the second chip removal groove (202) is set as a half elliptical structure; the front end of the milling cutter tooth (4) located in the first chip removal groove (201) extends beyond the end of the cutter head (2) to form an end tooth cutting edge; the milling cutter tooth (4) extends beyond the outer edge of the cutter head (2) to form an outer diameter cutting edge.

6. A stepped corn kernel milling cutter as described in claim 4, characterized in that: The shape of the milling cutter teeth (4) corresponds to the shape of the tooth mounting groove (33).

7. A stepped corn kernel milling cutter according to claim 1, characterized in that, The end of the cutter head (2) is provided with a chamfer (5), the chamfer (5) is perpendicular to the first unit chip removal groove group, and the inclination angle is 45°.

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