Stepped chip flute round nose end mill

Abstract

The utility model discloses a kind of stepped chip flute round nose cutter, including workpiece supporting seat, milling cutter support frame, milling mechanism and limiting component, milling cutter support frame is vertically fixed in workpiece supporting seat side, limiting component is set in milling cutter support frame side, and milling mechanism is set between milling cutter support frame and limiting component.In the utility model, follow the "power-saving lever" principle-the rotation connecting point of first, second driving plate and milling cutter support frame is fulcrum, when operating personnel force by adjusting lever, length of force arm is much greater than traditional straight bar type push rod, can significantly enlarge force, reduce artificial force intensity, directly solve the core problem of "push rod push effort", and lever structure can be realized after completing feeding "self-locking", without operating personnel sustained force can maintain milling cutter current position, avoid the deviation of feeding due to hand fatigue, while offsetting the reverse resistance of workpiece to milling cutter in cutting process, reduce operation burden.

Description

Technical Field

[0001] This utility model relates to a round nose end mill, specifically a stepped chip flute round nose end mill, belonging to the technical field of round nose end mills. Background Technology

[0002] In the field of metal cutting, the ball nose end mill is widely used in milling complex surfaces such as mold cavities and mechanical parts contours, thanks to its combination of the high rigidity of the flat end mill and the surface machining advantages of the ball end mill. It is especially indispensable in fields that require both machining efficiency and surface accuracy.

[0003] However, most existing round nose end mills have various problems. For example, in a multi-flute round nose end mill disclosed in publication number CN114713892A, although multiple cutting edges are evenly and staggered on the head of the cutter, reducing the wear of each cutting edge while ensuring smooth chip removal, in this technical solution and most current round nose end mills, as the manufacturing industry continues to increase its requirements for processing efficiency and workpiece precision, the operating conditions of round nose end mills are gradually developing towards high speed and precision. As the core link that determines the processing quality and ease of operation, the technical rationality and practicality of the "feed operation" in the milling process are receiving increasing attention.

[0004] In related technologies, current feed methods for round nose end mills are mainly divided into two categories: mechanical feed and manual feed. These two methods complement each other based on different application scenarios. However, the limitations of manual feed in specific scenarios have become a key issue restricting machining experience and efficiency. The core logic of manual feed is that the operator manually drives the round nose end mill directly or indirectly to adjust the milling position and control the feed rate. Its advantages include no need for complex equipment, high operational flexibility, and adaptability to various machining scenarios. However, the structural design of existing round nose end mills does not fully consider the labor-saving requirements of manual feed, resulting in a significant operational burden for the operator during operation. For example, existing round nose end mills often use a push rod structure as the key medium for human-machine interaction—the operator. Manually pressing the push rod to transfer hand force to the milling cutter body to achieve the feed action requires the push rod to be pressed. These push rods mostly adopt a straight rod rigid structure. Their original design intention is to achieve force transmission through simple mechanical connection. However, in actual operation, this structure has a significant conflict with the principles of ergonomics. The lever arm design is unreasonable. The distance between the fulcrum of the push rod and the point of force application is too close, forming a short lever arm structure. This causes the operator to apply more pressing force to drive the milling cutter to feed, which violates the principle of "efficiency-saving lever". In the context that manual feeding of round nose milling cutters cannot be completely replaced by mechanical feeding, the existing structure lacks optimized design for the need for effort saving, resulting in problems such as laborious operation and easy fatigue. It is no longer suitable for the needs of efficient, safe and convenient operation in scenarios such as small batch processing and emergency milling. Utility Model Content

[0005] 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 stepped chip-removing flute round nose end mill.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A stepped chip-removing flute round nose end mill includes a workpiece support, an end mill support frame, a milling mechanism, and a limiting component. The end mill support frame is vertically fixed to one side of the workpiece support, the limiting component is disposed on one side of the end mill support frame, and the milling mechanism is disposed between the end mill support frame and the limiting component. The milling mechanism includes a first active plate, a second active plate, a linkage plate, a fixed base, a tool fixing cylinder, and a round nose end mill body. One end of the first active plate and the second active plate are rotatably connected to the end mill support frame, and the two are arranged side by side. There are two linkage plates, one end of which is rotatably connected to the other end of the first active plate and the center of the second active plate, respectively, and adjacent linkage plates are arranged side by side. The fixed base is rotatably connected to the other end of the linkage plate. The tool fixing cylinder is located at the bottom of the fixed base, and the round nose end mill body is located inside the tool fixing cylinder. The linkage plate, the first active plate, and the second active plate are combined to form a lever self-locking structure. The limiting component includes a limiting plate, which is fixed to one side of the milling cutter support frame by a screw. The first active plate and the second active plate are located between the milling cutter support frame and the limiting plate.

[0007] As a further improvement of this utility model: the rotating connection ends of the first active plate, the second active plate and the milling cutter support frame are all coaxially fixed with active gear disks, and two adjacent active gear disks mesh with each other.

[0008] As a further embodiment of this utility model: the driven gear plate is coaxially fixed to the rotating connection end of the linkage plate and the fixed base, and two adjacent driven gear plates mesh with each other, and an adjusting rod is fixed to the other end of the second driving plate.

[0009] As a further embodiment of this utility model: the limiting component also includes a positioning hole, a positioning rod and a magnetic chuck. The positioning hole is disposed through the limiting plate and multiple such holes are equidistantly arranged along the rotation trajectory of the second active plate. One end of the positioning rod is inserted into the positioning hole, and the magnetic chuck is coaxially fixed to the other end of the positioning rod and magnetically connected to the limiting plate.

[0010] As a further improvement of this utility model: a chip removal groove is provided on the peripheral wall of the round nose milling cutter body, and the chip removal groove has a stepped structure.

[0011] As a further embodiment of this utility model: a pipe connector is provided on one side of the fixed base, and a flow guide cavity is provided between the tool fixing cylinder and the round nose milling cutter body, which is connected to the pipe connector; a spray hole is provided on the outer wall of the round nose milling cutter body.

[0012] The beneficial effects of this utility model are: This invention follows the principle of "effort-saving lever"—using the rotational connection point between the first and second active plates and the milling cutter support frame as the fulcrum, when the operator applies force through the adjusting rod, the lever arm length is much greater than that of a traditional straight rod push rod, which can significantly amplify the force and reduce the intensity of manual force application, directly solving the core problem of "laborious push rod pushing." Furthermore, the lever structure can achieve "self-locking" after completing the feed, maintaining the current position of the milling cutter without requiring continuous force from the operator, avoiding feed deviation caused by hand fatigue, and simultaneously counteracting the reverse resistance of the workpiece to the milling cutter during the cutting process. The force not only reduces the operating burden but also prevents the milling cutter from "retracting" and affecting the machining accuracy. At the same time, the first and second active plates are coaxially fixed with the active gear disks of the rotating end of the milling cutter support frame, which can force the two active plates to rotate synchronously, avoiding "one-sided offset" caused by uneven force on a single plate, ensuring that the feed trajectory is always along the preset direction, and preventing the milling cutter from slipping or going astray. Meanwhile, the linkage plate is coaxially fixed with the driven gear disk of the rotating end of the fixed seat, which can smoothly transmit the movement of the linkage plate to the fixed seat, avoiding the milling cutter "vibration" caused by uneven force transmission, and improving the workpiece machining quality. By setting the limiting component, and then connecting the positioning rod with the positioning holes at different positions, the rotation angle of the second active plate is limited, thereby achieving "graded positioning" of the milling cutter feed position. Operators can quickly lock the required feed depth or range without repeated calibration, thus improving processing efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the milling mechanism of this utility model; Figure 3 This is a schematic diagram of the limiting component structure of this utility model; Figure 4 This is a schematic diagram of the fixing base and its connection structure of the present invention.

[0014] In the diagram: 1. Workpiece support, 2. Milling cutter support frame, 3. Milling mechanism, 31. First driving plate, 32. Second driving plate, 33. Linkage plate, 34. Fixed seat, 35. Tool fixing cylinder, 36. Round nose milling cutter body, 37. Driving gear plate, 38. Driven gear plate, 39. Adjusting rod, 4. Limiting assembly, 41. Limiting plate, 42. Positioning hole, 43. Positioning rod, 44. Magnetic chuck, 5. Chip removal groove, 6. Pipe joint. Detailed Implementation

[0015] 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

[0016] like Figures 1 to 4 As shown, a stepped chip-removing flute round nose end mill includes a workpiece support 1, an end mill support frame 2, a milling mechanism 3, and a limiting component 4. The end mill support frame 2 is vertically fixed on one side of the workpiece support 1, the limiting component 4 is disposed on one side of the end mill support frame 2, and the milling mechanism 3 is disposed between the end mill support frame 2 and the limiting component 4. The milling mechanism 3 includes a first active plate 31, a second active plate 32, a linkage plate 33, a fixed base 34, a tool fixing cylinder 35, and a round nose end mill body 36. One end of the first active plate 31 and the second active plate 32 are rotatably connected to the end mill support frame 2, and the two are arranged side by side. There are two linkage plates 33. One end of the two linkage plates 33 is rotatably connected to the other end of the first active plate 31 and the center of the second active plate 32, respectively, and the two adjacent linkage plates 33 are arranged side by side. The fixed base 34 is rotatably connected to the other end of the linkage plate 33. The tool fixing cylinder 35 is located at the bottom of the fixed base 34, and the round nose end mill body 36 is located inside the tool fixing cylinder 35. The linkage plate 33, the first active plate 31, and the second active plate 32 are combined to form a lever self-locking structure. The first active plate 31, the second active plate 32 and the rotating connection end of the milling cutter support frame 2 are all coaxially fixed with active gear disks 37, and two adjacent active gear disks 37 mesh with each other. The linkage plate 33 and the rotating connection end of the fixed seat 34 are coaxially fixed with driven gear disks 38, and two adjacent driven gear disks 38 mesh with each other. An adjusting rod 39 is fixed at the other end of the second active plate 32. The limiting component 4 includes a limiting plate 41, which is fixed to one side of the milling cutter support frame 2 by a screw. The first active plate 31 and the second active plate 32 are located between the milling cutter support frame 2 and the limiting plate 41. The limiting component 4 also includes a positioning hole 42, a positioning rod 43 and a magnetic chuck 44. The positioning hole 42 is provided through the limiting plate 41 and multiple holes are provided at equal intervals along the rotation trajectory of the second active plate 32. One end of the positioning rod 43 is inserted into the positioning hole 42, and the magnetic chuck 44 is coaxially fixed to the other end of the positioning rod 43 and magnetically connected to the limiting plate 41.

[0017] This invention follows the principle of "effort-saving lever"—using the rotational connection point between the first and second active plates and the milling cutter support frame 2 as the fulcrum, when the operator applies force through the adjusting rod 39, the lever arm length is much greater than that of a traditional straight rod push rod, which can significantly amplify the force and reduce the intensity of manual force application, directly solving the core problem of "laborious push rod pushing." Furthermore, the lever structure can achieve "self-locking" after completing the feed, maintaining the current position of the milling cutter without requiring continuous force from the operator, avoiding feed deviation caused by hand fatigue, and simultaneously counteracting the reverse resistance of the workpiece to the milling cutter during the cutting process, thus reducing... This reduces operational burden and prevents the milling cutter from "retracting" and affecting machining accuracy. At the same time, the first and second active plates are coaxially fixed with the active gear 37 at the rotating end of the milling cutter support frame 2, which meshes with each other and can force the two active plates to rotate synchronously, avoiding "one-sided offset" caused by uneven force on a single plate. This ensures that the feed trajectory is always along the preset direction, preventing the milling cutter from slipping or moving. Meanwhile, the linkage plate 33 meshes with the driven gear 38 at the rotating end of the fixed seat 34, which can smoothly transmit the movement of the linkage plate 33 to the fixed seat 34, avoiding milling cutter "vibration" caused by uneven force transmission and improving the workpiece machining quality. By setting the limiting component 4, and then connecting the positioning rod 43 with the positioning holes 42 at different positions, the rotation angle of the second active plate 32 is limited, thereby realizing the "graded positioning" of the milling cutter feed position. The operator can quickly lock the required feed depth or range without repeated calibration, thus improving processing efficiency. Example 2

[0018] like Figures 1 to 4 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes: The ball nose end mill body 36 has a chip removal groove 5 on its peripheral wall. The chip removal groove 5 has a stepped structure. The stepped structure breaks the single chip removal path of the traditional straight groove or spiral groove. By utilizing the step changes in groove depth and groove width, multiple "local acceleration zones" are formed during the milling process, thereby improving the chip removal speed.

[0019] A pipe connector 6 is provided on one side of the fixed base 34, and a guide cavity is provided between the tool fixing cylinder 35 and the round nose end mill body 36, which is connected to the pipe connector 6. A spray hole is provided on the outer wall of the round nose end mill body 36. External coolant enters the guide cavity through the pipe connector 6 and is directly sprayed onto the cutting edge area through the spray hole on the outer wall of the round nose end mill body 36, thereby achieving the internal cooling effect of the round nose end mill body 36.

[0020] Working principle: When using this round nose end mill, the operator applies force to the adjusting rod 39 at the end of the second driving plate 32, causing the first driving plate 31 and the second driving plate 32 to rotate around the end mill support frame 2. Together with the linkage plate 33, they form a lever structure. Using the rotation connection point as the fulcrum, the lever arm amplification effect reduces the applied force, achieving effortless feed. When the target position is reached, the lever structure self-locks, maintaining the end mill position without continuous force application and counteracting the cutting reaction force. The driving gears 37 at the rotating ends of the first driving plate 31 and the second driving plate 32 mesh with each other, forcing the two... The plates rotate synchronously to avoid unilateral deviation; the driven gear 38 at the connection between the linkage plate 33 and the fixed seat 34 meshes with each other, smoothly transmitting the movement of the linkage plate 33 to the fixed seat 34, ensuring that the tool fixing cylinder 35 and the round nose end mill body 36 are accurately fed along the preset trajectory, so that the round nose end mill body 36 abuts against the high-speed rotating workpiece to perform milling operations. During milling, if it is necessary to control the milling depth of the round nose end mill body 36, the positioning rod 43 is connected with the positioning holes 42 at different positions to limit the rotation angle of the first active plate 31 and the second active plate 32.

[0021] 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.

[0022] 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 stepped chip-removing flute round nose end mill, comprising a workpiece support (1), an end mill support frame (2), a milling mechanism (3), and a limiting assembly (4), characterized in that, The milling cutter support frame (2) is vertically fixed on one side of the workpiece support seat (1), the limiting component (4) is disposed on one side of the milling cutter support frame (2), and the milling mechanism (3) is disposed between the milling cutter support frame (2) and the limiting component (4). The milling mechanism (3) includes a first active plate (31), a second active plate (32), a linkage plate (33), a fixed seat (34), a tool fixing cylinder (35), and a round nose end mill body (36). One end of the first active plate (31) and the second active plate (32) are rotatably connected to the end mill support frame (2), and the two are arranged side by side. There are two linkage plates (33). One end of the two linkage plates (33) is rotatably connected to the other end of the first active plate (31) and the center of the second active plate (32), and the two adjacent linkage plates (33) are arranged side by side. The fixed seat (34) is rotatably connected to the other end of the linkage plate (33). The tool fixing cylinder (35) is located at the bottom of the fixed seat (34). The round nose end mill body (36) is located inside the tool fixing cylinder (35). The linkage plate (33) is combined with the first active plate (31) and the second active plate (32) to form a lever self-locking structure. The limiting component (4) includes a limiting plate (41), which is fixed to one side of the milling cutter support frame (2) by a screw. The first active plate (31) and the second active plate (32) are located between the milling cutter support frame (2) and the limiting plate (41).

2. A stepped chip flute round nose end mill according to claim 1, characterized in that: The first active plate (31), the second active plate (32) and the rotating connection end of the milling cutter support frame (2) are all coaxially fixed with active gear disks (37), and two adjacent active gear disks (37) mesh with each other.

3. A stepped chip flute round nose end mill according to claim 1, characterized in that: The driven gear plate (38) is coaxially fixed at the rotating connection end of the linkage plate (33) and the fixed base (34), and two adjacent driven gear plates (38) mesh with each other, and an adjusting rod (39) is fixed at the other end of the second driving plate (32).

4. A stepped chip flute round nose end mill according to claim 1, characterized in that: The limiting component (4) also includes a positioning hole (42), a positioning rod (43) and a magnetic chuck (44). The positioning hole (42) is disposed through the limiting plate (41) and multiple holes are equidistantly arranged along the rotation trajectory of the second active plate (32). One end of the positioning rod (43) is inserted into the positioning hole (42), and the magnetic chuck (44) is coaxially fixed to the other end of the positioning rod (43) and magnetically connected to the limiting plate (41).

5. A stepped chip flute round nose end mill according to claim 1, characterized in that: The ball nose end mill body (36) is provided with a chip removal groove (5) on its peripheral wall, and the chip removal groove (5) has a stepped structure.

6. A stepped chip flute round nose end mill according to claim 1, characterized in that: A pipe connector (6) is provided on one side of the fixed base (34), and a flow guide cavity is provided between the tool fixing cylinder (35) and the round nose milling cutter body (36), and is connected to the pipe connector (6). Spray holes are provided on the outer wall of the round nose milling cutter body (36).

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