A ball-end milling tool with a chip breaker

Abstract

The utility model discloses a kind of ball cutter processing cutters with chip breaker groove, including base, first transmission rod, second transmission rod, slotting cutter, ball cutter and linkage mechanism, first transmission rod is rotatably connected on base, second transmission rod is rotatably connected at first transmission rod axle center, and second transmission rod length is greater than first transmission rod, slotting cutter is coaxially fixed in first transmission rod top end, ball cutter is coaxially fixed in second transmission rod top end, and ball cutter is located in slotting cutter inside.In the utility model, by the coaxial nesting design of first transmission rod and second transmission rod, slotting cutter and ball cutter form the integrated structure of "outer slot cutter+inner ball cutter", when processing, ball cutter can complete round hole milling synchronously, slotting cutter completes outside annular slot processing synchronously, without step-by-step tool changing, simplify traditional two-step process into one operation, especially suitable for hydraulic valve sleeve, mould cavity and other coaxial multi-feature processing scenes.

Description

Technical Field

[0001] This utility model relates to a machining tool, specifically a ball end mill with chip breaking grooves, belonging to the field of machining tool technology. Background Technology

[0002] In precision machining fields such as mechanical manufacturing, mold processing, and aerospace component production, ball end mills have become one of the core cutting tools due to their ability to achieve high-precision machining of curved surfaces, arc transitions, and complex cavities. They are widely used in milling operations for features such as round holes and curved surface contours on workpieces.

[0003] However, most existing machining tools have various problems. For example, in the high-precision ball end mill with chip breaker groove disclosed in CN216575748U, although the edge wear resistance is increased and the tool is detachably installed in the bushing, which can easily replace the damaged tool and thus increase the tool life, as the requirements of modern manufacturing for production efficiency and machining accuracy continue to increase, the workpiece structure design is becoming more and more complex. Single feature machining can hardly meet the actual production needs. The application scenarios of multi-feature coaxial machining (such as the combination structure of round hole and annular groove) are becoming more and more common. Typical examples include the oil hole annular groove of hydraulic valve sleeve, the positioning hole annular step of mold cavity, and the sealing groove of the mounting hole of aero-engine blade. All of these require the annular groove to be opened coaxially on the basis of round hole, and there are strict requirements for the coaxiality, surface roughness and dimensional accuracy of the two.

[0004] Current ball end mill cutting edge designs are primarily geared towards machining single features. To complete the machining of a "round hole + annular groove," at least two independent processes are required. First, a standard ball end mill is used to mill the round hole. Second, after the round hole is machined, a dedicated slotting cutter (such as an annular slotting cutter or end mill) is used. Positioning is based on the axis of the machined round hole, and an annular groove is coaxially created on the outside of the round hole using radial feed or circumferential milling. During this process, the coaxiality of the tool and the round hole must be recalibrated to avoid eccentricity errors between the groove and the round hole. In some high-precision machining scenarios, to further control dimensional deviations, an inspection step may even be added between the two processes, further extending the machining flow. Furthermore, in step-by-step machining, each process requires a different type of tool. Frequent tool changes not only consume equipment downtime but also require tool coordinate system re-establishment through tool setting equipment or manual calibration. Especially in small-batch, multi-variety production, tool changing and calibration time accounts for a significant portion of the production cycle. 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 ball end mill with chip breaking grooves.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A ball end mill with chip breaking groove includes a base, a first transmission rod, a second transmission rod, a grooving tool, a ball end mill, and a linkage mechanism. The first transmission rod is rotatably connected to the base, the second transmission rod is rotatably connected to the shaft of the first transmission rod, and the length of the second transmission rod is greater than that of the first transmission rod. The grooving tool is coaxially fixed to the top of the first transmission rod, the ball end mill is coaxially fixed to the top of the second transmission rod, and the ball end mill is located inside the grooving tool. The linkage mechanism is disposed inside the base. The linkage mechanism includes a support frame, a first worm gear, a second worm gear, a worm, and a servo motor. The support frame is fixed inside the base. The first worm gear is coaxially fixed to the bottom end of the second transmission rod. The second worm gear is rotatably connected to one side of the support frame and is arranged horizontally alongside the first worm gear. The servo motor is fixed on the support frame. The worm is coaxially fixed on the output shaft of the servo motor and meshes between the first worm gear and the second worm gear.

[0007] As a further embodiment of this utility model: the linkage mechanism further includes a driving gear and a driven gear, the driving gear being coaxially fixed to the top of the second worm gear, the driven gear being coaxially fixed to the first transmission rod, and the driving gear and the driven gear meshing with each other.

[0008] As a further improvement of this invention, the diameter of the driven gear is at least twice that of the driving gear.

[0009] As a further improvement of this utility model: a chip breaking groove is provided on the side wall of the grooving tool, and the chip breaking groove is connected to the interior of the grooving tool.

[0010] As a further improvement of this utility model, the grooving tool, the ball cutter, the first transmission rod, and the second transmission rod are respectively detachably connected by screws.

[0011] As a further improvement of this utility model: the surfaces of the grooving tool and the ball cutter are both coated with an antistatic coating, and a spiral chip removal groove is provided on the outer wall of the ball cutter.

[0012] The beneficial effects of this utility model are: In this utility model, the coaxial nesting design of the first transmission rod and the second transmission rod enables the grooving tool and the ball end mill to form an integrated structure of "outer grooving tool + inner ball end mill". During processing, the ball end mill can simultaneously complete the milling of the round hole, and the grooving tool can simultaneously complete the processing of the outer annular groove. There is no need to change tools in steps, which simplifies the traditional two-step process into one operation, significantly improving the processing efficiency. It is especially suitable for scenarios such as hydraulic valve sleeves and mold cavities that require coaxial multi-feature processing. Furthermore, the servo motor drives the worm gear to simultaneously mesh with the first worm wheel and the second worm wheel. Through the meshing transmission of the driving gear and the driven gear, the first transmission rod and the second transmission rod can achieve differentiated speed output. This design allows the grooving tool and the ball cutter to work together at different speeds, adapting to the different cutting parameter requirements of round holes and annular grooves. While ensuring coaxiality, it optimizes cutting efficiency and surface quality. The chip-breaking groove on the side wall of the grooving tool is connected to the interior, which can force the chips generated during the grooving process to break them, preventing long spiral chips from mixing and entangled with short chips. The through structure of the chip-breaking groove, together with the centrifugal force of the rotating tool, can quickly discharge the chips from the processing area, reducing the impact of chip accumulation on tool life and workpiece surface, eliminating the need for additional pauses in the cleaning process, and further improving the continuity of processing. 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 linkage mechanism of this utility model; Figure 3 This is a schematic diagram of the worm gear and its connection structure of this utility model; Figure 4 This is a schematic diagram of the grooving tool and ball end mill of this utility model.

[0014] In the diagram: 1. Base, 2. First transmission rod, 3. Second transmission rod, 4. Grooving tool, 5. Ball cutter, 6. Linkage mechanism, 61. Support frame, 62. First worm gear, 63. Second worm gear, 64. Worm, 65. Servo motor, 66. Drive gear, 67. Driven gear. 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 4As shown, a ball end mill machining tool with chip breaking groove includes a base 1, a first transmission rod 2, a second transmission rod 3, a grooving tool 4, a ball end mill 5, and a linkage mechanism 6. The first transmission rod 2 is rotatably connected to the base 1, the second transmission rod 3 is rotatably connected to the axis of the first transmission rod 2, and the length of the second transmission rod 3 is greater than that of the first transmission rod 2. The grooving tool 4 is coaxially fixed to the top of the first transmission rod 2, the ball end mill 5 is coaxially fixed to the top of the second transmission rod 3, and the ball end mill 5 is located inside the grooving tool 4. The linkage mechanism 6 is disposed inside the base 1. The linkage mechanism 6 includes a support frame 61, a first worm gear 62, a second worm gear 63, a worm 64, and a servo motor 65. The support frame 61 is fixed inside the base 1. The first worm gear 62 is coaxially fixed to the bottom end of the second transmission rod 3. The second worm gear 63 is rotatably connected to one side of the support frame 61 and is arranged horizontally alongside the first worm gear 62. The servo motor 65 is fixed on the support frame 61. The worm 64 is coaxially fixed on the output shaft of the servo motor 65 and meshes between the first worm gear 62 and the second worm gear 63. The linkage mechanism 6 also includes a driving gear 66 and a driven gear 67. The driving gear 66 is coaxially fixed to the top of the second worm gear 63, and the driven gear 67 is coaxially fixed to the first transmission rod 2. The driving gear 66 and the driven gear 67 mesh with each other. The diameter of the driven gear 67 is at least twice that of the driving gear 66. The grooving tool 4 has a chip breaking groove on its side wall, and the chip breaking groove is connected to the interior of the grooving tool 4.

[0017] In this utility model, the coaxial nesting design of the first transmission rod 2 and the second transmission rod 3 enables the grooving tool 4 and the ball cutter 5 to form an integrated structure of "outer grooving tool + inner ball cutter". During processing, the ball cutter 5 can simultaneously complete the milling of the round hole, and the grooving tool 4 can simultaneously complete the processing of the outer annular groove. There is no need to change tools in steps, which simplifies the traditional two-step process into one operation, significantly improving the processing efficiency. It is especially suitable for scenarios such as hydraulic valve sleeves and mold cavities that require coaxial multi-feature processing. Furthermore, the servo motor 65 drives the worm gear 64 to simultaneously mesh with the first worm wheel 62 and the second worm wheel 63. Through the meshing transmission of the driving gear 66 and the driven gear 67, the first transmission rod 2 and the second transmission rod 3 are output at different speeds. This design allows the grooving tool 4 and the ball cutter 5 to work together at different speeds, adapting to the different cutting parameter requirements of round holes and annular grooves. While ensuring coaxiality, it optimizes cutting efficiency and surface quality. The chip breaking grooves on the four side walls of the grooving tool are connected to the interior, which can force the chips generated during the cutting process to break the chips, preventing long spiral chips from mixing and entangled with short chips. The through structure of the chip breaking grooves, together with the centrifugal force of the tool rotation, can quickly discharge the chips from the processing area, reducing the impact of chip accumulation on tool life and workpiece surface, eliminating the need for additional pauses in the cleaning process, and further improving the continuity of processing. 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 grooving tool 4 and the ball cutter 5 are detachably connected to the first transmission rod 2 and the second transmission rod 3 by screws. When the tool is worn or needs to be adapted to different processing requirements, the old tool can be quickly disassembled and replaced with a new tool without replacing the entire transmission rod assembly. Compared with the traditional integrated structure, it reduces tool changing time and is especially suitable for frequent tool model changes in small-batch, multi-variety production.

[0019] Both the grooving tool 4 and the ball end mill 5 are coated with an antistatic coating, and a spiral chip removal groove is provided on the outer wall of the ball end mill 5. The antistatic coating can reduce the electrostatic potential on the tool surface, reduce the problem of tool adhesion caused by electrostatic adsorption of chips during the cutting process, and avoid chip accumulation affecting the sharpness of the cutting edge. In addition, the spiral chip removal groove on the outer wall of the ball end mill 5 and the chip breaking groove of the grooving tool 4 form a collaborative chip removal system to avoid tool wear caused by chips winding in the hole.

[0020] Working principle: Before processing, the servo motor 65 fixed on the support frame 61 is started. The output shaft of the servo motor 65 drives the coaxially fixed worm gear 64 to rotate at high speed. The worm gear 64 meshes with the first worm wheel 62 and the second worm wheel 63 arranged horizontally in parallel, transmitting power in two paths. The first worm wheel 62 directly drives the second transmission rod 3 to rotate around its own axis. When the second worm wheel 63 rotates, it drives the driving gear 66 to rotate synchronously. The driving gear 66 then meshes with the driven gear 67 fixed coaxially on the first transmission rod 2, so that the first transmission rod 2 rotates at a lower speed than the second transmission rod 3. Then, the first transmission rod 2 and the second transmission rod 3 drive the grooving tool 4 and the ball cutter 5 to rotate respectively, and simultaneously perform milling operations on the workpiece.

[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 ball end mill machining tool with chip breaking groove, comprising a base (1), a first transmission rod (2), a second transmission rod (3), a grooving tool (4), a ball end mill (5), and a linkage mechanism (6), characterized in that, The first transmission rod (2) is rotatably connected to the base (1), the second transmission rod (3) is rotatably connected to the shaft of the first transmission rod (2), and the length of the second transmission rod (3) is greater than that of the first transmission rod (2). The grooving tool (4) is coaxially fixed to the top of the first transmission rod (2), the ball cutter (5) is coaxially fixed to the top of the second transmission rod (3), and the ball cutter (5) is located inside the grooving tool (4). The linkage mechanism (6) is set inside the base (1). The linkage mechanism (6) includes a support frame (61), a first worm gear (62), a second worm gear (63), a worm (64), and a servo motor (65). The support frame (61) is fixed inside the base (1). The first worm gear (62) is coaxially fixed to the bottom end of the second transmission rod (3). The second worm gear (63) is rotatably connected to one side of the support frame (61) and is arranged horizontally alongside the first worm gear (62). The servo motor (65) is fixed on the support frame (61). The worm (64) is coaxially fixed on the output shaft of the servo motor (65) and meshes between the first worm gear (62) and the second worm gear (63).

2. The ball end mill machining tool with chip breaker groove according to claim 1, characterized in that: The linkage mechanism (6) further includes a driving gear (66) and a driven gear (67). The driving gear (66) is coaxially fixed to the top of the second worm gear (63), and the driven gear (67) is coaxially fixed to the first transmission rod (2). The driving gear (66) and the driven gear (67) mesh with each other.

3. A ball end mill machining tool with chip breaker groove according to claim 2, characterized in that: The diameter of the driven gear (67) is at least twice that of the driving gear (66).

4. A ball end mill machining tool with chip breaker groove according to claim 1, characterized in that: The grooving tool (4) has a chip breaking groove on its side wall, and the chip breaking groove is connected to the interior of the grooving tool (4).

5. A ball end mill machining tool with chip breaker groove according to claim 1, characterized in that: The grooving tool (4), the ball cutter (5), the first transmission rod (2), and the second transmission rod (3) are detachably connected by screws.

6. A ball end mill machining tool with chip breaker groove according to claim 1, characterized in that: The surfaces of the grooving tool (4) and the ball cutter (5) are coated with an antistatic coating, and a spiral chip removal groove is provided on the outer wall of the ball cutter (5).

Images