Double-edge staggered cutting round nose milling cutter

Abstract

The utility model discloses a double-edge dislocation cutting round nose milling cutter which comprises a supporting plate, a transmission rod, a bearing plate, a limiting plate, a linkage toothed plate, a round nose milling cutter and a linkage adjusting mechanism, the supporting plate is fixed on an external machine tool, the transmission rod is rotatably connected to the supporting plate, the bearing plate is rotatably connected to one end of the transmission rod, the limiting plate is fixed on one side of the bearing plate, and the linkage toothed plate is fixed on the other side of the bearing plate. The linkage toothed plate is clamped in the limiting plate in a sliding mode, and the round nose milling cutter is arranged at one end of the linkage toothed plate. The linkage adjusting mechanism has the beneficial effects that the driven fluted disc is meshed and linked with the linkage toothed plate through the synchronous linkage structure of the first cam, the second cam and the transmission rod in the linkage adjusting mechanism and the phase difference design of cam curves, so that the axial adjustment of the round nose milling cutter is realized, and the service life of the round nose milling cutter is prolonged. And meanwhile, the second abutting plate rotates to drive the bearing plate to deflect, radial adjustment of the round nose milling cutter is achieved, axial feeding and radial compensation motion are coupled to a single driving system, and continuous track control over a milling path is achieved.

Description

Technical Field

[0001] This utility model relates to a round nose end mill, specifically a double-edged offset cutting round nose end mill, belonging to the technical field of round nose end mills. Background Technology

[0002] A round nose end mill is a cutting tool that uses a milling cutter to cut on a workpiece. Its insert gear is arc-shaped, making it suitable for machining curved surfaces with different curvatures. Cutting is achieved by rotating and feeding the workpiece. The round nose end mill has a small cutting angle, which not only maintains the stability of the cutting force but also reduces chip accumulation, improving cutting accuracy and the quality of the machined surface.

[0003] However, most existing round nose end mills have various problems. For example, in the integral carbide round nose end mill disclosed in publication number CN218396129U, although it ensures that the milled product leaves no flash through its ultra-high sharpness and adopts a high-precision end-rounded double-edged design, it can process the product into a round nose shape in one pass and has an excellent surface appearance quality. However, in this technical solution and most current technical solutions, the current round nose end mills usually adopt a fixed mounting structure. During the machining process, cutting can only be achieved by axial feed motion. When the groove width exceeds the cutting radius of the end mill, it is necessary to repeatedly move the workpiece or adjust the position of the end mill support table to complete the machining, which leads to a decrease in machining efficiency and easy to produce tool marks. Existing end mill support tables mostly adopt a single degree of freedom adjustment mechanism, which makes it difficult to achieve multi-directional synchronous displacement compensation in XYZ three-axis linkage machining. Especially when machining irregular grooves, frequent start-stop of the equipment for position calibration will significantly reduce machining accuracy and surface quality. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing technologies are too simplistic. Specifically, the purpose of this utility model is to solve the aforementioned shortcomings of existing technologies by proposing a double-edged offset cutting round nose end mill.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A double-edged offset cutting round nose end mill includes a support plate, a transmission rod, a support plate, a limiting plate, a linkage toothed plate, a round nose end mill, and a linkage adjustment mechanism. The support plate is fixed on an external machine tool, the transmission rod is rotatably connected to the support plate, the support plate is rotatably connected to one end of the transmission rod, the limiting plate is fixed to one side of the support plate, the linkage toothed plate is slidably engaged in the limiting plate, and the round nose end mill is disposed at one end of the linkage toothed plate.

[0007] The linkage adjustment mechanism is mounted on the support plate and includes an axial adjustment unit and a radial adjustment unit. The axial adjustment unit includes a first cam, a first abutting rod, and a driven gear plate. The first cam is fixed on the transmission rod. One end of the first abutting rod and the driven gear plate are fixed to each other, and their fixed ends are rotatably connected to the support plate. The other end of the first abutting rod slides against the edge of the first cam. The driven gear plate meshes with the linkage gear plate.

[0008] As a further embodiment of this utility model: the radial adjustment unit includes a second cam, a second abutment plate, and a sliding seat. The second cam is fixed on the transmission rod and located on one side of the first cam. One end of the second abutment plate is rotatably connected to the support plate, and the other end slides against the edge of the second cam. The sliding seat is rotatably connected to the center of the second abutment plate, and the driven gear plate is slidably engaged in the sliding seat.

[0009] As a further improvement of this utility model, torsion springs are provided at the connection end between the second abutment plate and the support plate, as well as at the fixing end of the first abutment rod and the driven gear plate.

[0010] As a further improvement of this utility model: one end of the linkage toothed plate and the round nose milling cutter is provided with a docking disc, and two adjacent docking discs are detachably connected by bolts.

[0011] As a further improvement of this utility model, the round nose end mill uses two circumferential cutting edges with a helix angle of 20-40°, which are unequally distributed with alternating angles of 82° and 98°, and are combined to form a double-edge staggered layout.

[0012] As a further improvement of this invention, the round nose end mill has a multilayer TiAlN-TiN composite coating deposited on the surface of its cutting edge.

[0013] The beneficial effects of this utility model are:

[0014] In this invention, the first cam, the second cam, and the transmission rod are synchronously linked in the linkage adjustment mechanism. Combined with the phase difference design of the cam curve, the driven gear plate and the linkage gear plate mesh and are linked to achieve axial adjustment of the round nose end mill. At the same time, the rotation of the second abutment plate drives the support plate to deflect, thereby achieving radial adjustment of the round nose end mill. The axial feed and radial compensation motion are coupled into a single drive system to achieve continuous trajectory control of the milling path. This avoids the machining interruption caused by traditional step-by-step adjustment, expands the cutting coverage of the end mill at compound angles, and effectively solves the technical pain point of frequent tooling adjustments required when machining wide slots with traditional round nose end mills. Significant technical breakthroughs have been achieved in terms of machining efficiency, accuracy maintenance, and cost control. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the cam and its overall connection structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the connection structure of the linkage adjustment mechanism of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure of the round nose milling cutter of this utility model.

[0019] In the figure: 1. Support plate, 2. Transmission rod, 3. Support plate, 4. Limiting plate, 5. Linkage toothed plate, 6. Round nose end mill, 7. Linkage adjustment mechanism, 71. First cam, 72. First abutting rod, 73. Driven toothed plate, 74. Second cam, 75. Second abutting plate, 76. Sliding seat, 77. Torsion spring. 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. Example 1

[0021] like Figures 1 to 4 As shown, a double-edged offset cutting round nose end mill includes a support plate 1, a transmission rod 2, a support plate 3, a limiting plate 4, a linkage toothed plate 5, a round nose end mill 6, and a linkage adjustment mechanism 7. The support plate 1 is fixed on an external machine tool, the transmission rod 2 is rotatably connected to the support plate 1, the support plate 3 is rotatably connected to one end of the transmission rod 2, the limiting plate 4 is fixed to one side of the support plate 3, the linkage toothed plate 5 is slidably engaged in the limiting plate 4, and the round nose end mill 6 is disposed at one end of the linkage toothed plate 5.

[0022] The linkage adjustment mechanism 7 is mounted on the support plate 1, and the linkage adjustment mechanism 7 includes an axial adjustment unit and a radial adjustment unit. The axial adjustment unit includes a first cam 71, a first abutting rod 72 and a driven gear 73. The first cam 71 is fixed on the transmission rod 2. One end of the first abutting rod 72 and the driven gear 73 are fixed to each other, and their fixed ends are rotatably connected to the support plate 1. The other end of the first abutting rod 72 slides against the edge of the first cam 71. The driven gear 73 meshes with the linkage gear plate 5.

[0023] The radial adjustment unit includes a second cam 74, a second abutment plate 75, and a sliding seat 76. The second cam 74 is fixed on the transmission rod 2 and located on one side of the first cam 71. One end of the second abutment plate 75 is rotatably connected to the support plate 1, and the other end slides against the edge of the second cam 74. The sliding seat 76 is rotatably connected to the center of the second abutment plate 75, and the driven gear 73 is slidably engaged in the sliding seat 76.

[0024] In this invention, the first cam 71 and the second cam 74 in the linkage adjustment mechanism 7 are synchronously linked with the transmission rod 2. Combined with the phase difference design of the cam curve, the driven gear plate 73 meshes with the linkage gear plate 5 to achieve axial adjustment of the round nose end mill 6. At the same time, the rotation of the second abutment plate 75 drives the support plate 3 to deflect, thereby achieving radial adjustment of the round nose end mill 6. The axial feed and radial compensation motion are coupled into a single drive system to achieve continuous trajectory control of the milling path. This avoids the machining interruption caused by traditional step-by-step adjustment, expands the cutting coverage of the end mill at compound angles, and effectively solves the technical pain point of frequent tooling adjustments required when machining wide slots with traditional round nose end mills. Significant technical breakthroughs have been achieved in terms of machining efficiency, accuracy maintenance, and cost control. Example 2

[0025] like Figures 1 to 4 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0026] The second abutment plate 75 is connected to the support plate 1 at the connection end, and the first abutment rod 72 and the fixed end of the driven gear 73 are all provided with torsion springs 77. The elastic force of the torsion springs 77 enables the first abutment rod 72 and the second abutment plate 75 to abut against the cam respectively.

[0027] Both the linkage toothed plate 5 and the round nose end mill 6 are equipped with a docking disc at one end, and two adjacent docking discs are detachably connected by bolts. The detachable connection structure allows the round nose end mill 6 to be quickly disassembled and replaced.

[0028] The round nose end mill 6 uses two circumferential cutting edges with helix angles of 20-40°, which are unequally distributed with alternating angles of 82° and 98°. This combination forms a double-edge staggered layout, creating an asymmetrical cutting force, reducing radial vibration and improving chip removal efficiency.

[0029] The round nose end mill 6 has a multi-layer TiAlN-TiN composite coating deposited on the cutting edge surface, which extends the tool's service life.

[0030] Working principle: When using this round nose end mill, first connect and lock the round nose end mill 6 to the linkage tooth plate 5 with bolts, and drive the transmission rod 2 to rotate through an external drive device. The transmission rod 2 drives the first cam 71 and the second cam 74 to rotate synchronously. During rotation, the first abutment rod 72 is linked at the edge of the first cam 71, and at the same time the driven tooth plate 73 rotates and meshes with the linkage tooth plate 5 to realize the axial adjustment of the round nose end mill 6. At the same time, the second abutment plate 75 is linked with the second cam 74 and rotates on the support plate 1 to drive the support plate 3 to deflect, thereby realizing the radial adjustment of the round nose end mill 6.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-edged offset cutting round nose end mill, comprising a support plate (1), a transmission rod (2), a support plate (3), a limiting plate (4), a linkage toothed plate (5), a round nose end mill (6), and a linkage adjustment mechanism (7), characterized in that, The support plate (1) is fixed on an external machine tool, the transmission rod (2) is rotatably connected to the support plate (1), the support plate (3) is rotatably connected to one end of the transmission rod (2), the limiting plate (4) is fixed on one side of the support plate (3), the linkage tooth plate (5) is slidably engaged in the limiting plate (4), and the round nose end mill (6) is set at one end of the linkage tooth plate (5). The linkage adjustment mechanism (7) is set on the support plate (1), and the linkage adjustment mechanism (7) includes an axial adjustment unit and a radial adjustment unit. The axial adjustment unit includes a first cam (71), a first abutting rod (72) and a driven gear plate (73). The first cam (71) is fixed on the transmission rod (2). One end of the first abutting rod (72) and the driven gear plate (73) are fixed to each other, and their fixed ends are rotatably connected to the support plate (1). The other end of the first abutting rod (72) slides against the edge of the first cam (71). The driven gear plate (73) meshes with the linkage gear plate (5).

2. The double-edged offset cutting round nose end mill according to claim 1, characterized in that: The radial adjustment unit includes a second cam (74), a second abutment plate (75), and a sliding seat (76). The second cam (74) is fixed on the transmission rod (2) and located on one side of the first cam (71). One end of the second abutment plate (75) is rotatably connected to the support plate (1), and the other end slides against the edge of the second cam (74). The sliding seat (76) is rotatably connected to the center of the second abutment plate (75), and the driven gear plate (73) is slidably engaged in the sliding seat (76).

3. A double-edged offset cutting round nose end mill according to claim 2, characterized in that: The second abutment plate (75) is connected to the support plate (1) and the first abutment rod (72) and the fixed end of the driven gear plate (73) are all provided with torsion springs (77).

4. A double-edged offset cutting round nose end mill according to claim 1, characterized in that: The linkage toothed plate (5) and the round nose end mill (6) are each provided with a docking disc at one end, and two adjacent docking discs are detachably connected by bolts.

5. A double-edged offset cutting round nose end mill according to claim 1, characterized in that: The round nose end mill (6) uses two circumferential cutting edges with a helix angle of 20-40°, which are distributed unequally at alternating angles of 82° and 98°, forming a double-edge staggered layout.

6. A double-edged offset cutting round nose end mill according to claim 1, characterized in that: The round nose end mill (6) has a multilayer TiAlN-TiN composite coating deposited on the cutting edge surface.

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