Numerical control milling machine for machining milling cutters

Abstract

This application discloses a CNC milling machine for machining milling cutters, relating to the field of CNC milling machine machining technology. It improves upon the problems of existing CNC milling machines requiring frequent fixture changes when machining milling cutters of different diameters, leading to low machining efficiency, long auxiliary time, and easy introduction of positioning errors. The machine includes a body and a worktable disposed within the body. The worktable is equipped with a positioning seat, which has positioning holes. Limiting blocks are spaced apart within the positioning holes, and multiple limiting blocks are distributed circumferentially along the positioning holes. The limiting blocks are slidably disposed within the positioning seat. The positioning seat is equipped with an elastic element for driving the limiting blocks to slide towards the center of the positioning holes. At least two clamping members are spaced apart above the positioning seat. Each clamping member includes a clamping block and a radial drive unit that drives the clamping block to move radially along the workpiece. This application achieves automatic centering and clamping of workpieces of different diameters and reduces machining errors.

Description

Technical Field

[0001] This application relates to the field of CNC milling machine technology, and in particular to a CNC milling machine for machining milling cutters. Background Technology

[0002] A CNC milling machine is a machine tool controlled by a computer program for milling workpieces made of metal, plastic, wood, etc. In CNC machining of precision workpieces such as milling cutters, the clamping and positioning of the workpiece are fundamental to ensuring the geometric accuracy of the final product (such as the consistency of spiral grooves and the runout of the cutting edge).

[0003] However, most existing CNC milling machines use a single-specification fixture to clamp the workpiece (i.e., the milling cutter), limiting their application to machining workpieces of fixed diameters. When machining milling cutters of different diameters is required, the machine must be stopped and a matching fixture must be changed. This frequent changeover not only significantly increases auxiliary time and reduces machining efficiency, but also potentially introduces new positioning errors during each changeover, causing a shift in the workpiece's rotation center and affecting product consistency in mass production. Summary of the Invention

[0004] To address the issues of low machining efficiency, long auxiliary time, and easy introduction of positioning errors caused by the frequent fixture changes required when machining milling cutters of different diameters in existing CNC milling machines, this application provides a CNC milling machine for machining milling cutters.

[0005] This application provides a CNC milling machine for machining milling cutters, which adopts the following technical solution: A CNC milling machine for machining milling cutters includes a machine body and a worktable disposed on the machine body. The worktable is provided with a positioning seat, the positioning seat has a positioning hole, and a number of limiting blocks are spaced apart in the positioning hole. The limiting blocks are distributed circumferentially along the positioning hole. The limiting blocks are slidably disposed in the positioning seat. The positioning seat is provided with an elastic element for driving the limiting blocks to have a sliding tendency toward the center of the positioning hole. At least two clamping members are spaced apart above the positioning seat. Each clamping member includes a clamping block and a radial drive unit that drives the clamping block to move radially along the workpiece.

[0006] Preferably, the elastic element is a return spring, the positioning seat has a receiving groove that fully accommodates the limiting block and the return spring, the limiting block is provided with a first stop, the groove opening of the receiving groove is provided with a second stop for the first stop to abut against, one end of the return spring abuts against the inner wall of the receiving groove, and the other end of the return spring abuts against the first stop.

[0007] Preferably, the end of the limiting block that extends into the positioning hole is provided with an inwardly protruding hook portion.

[0008] Preferably, the clamping block has an arc-shaped clamping surface on one side of the workpiece that corresponds to the outer circle of the workpiece.

[0009] Preferably, the clamping member further includes a connecting rod for connecting the clamping block and the radial drive unit, wherein the clamping block and the connecting rod are detachably connected.

[0010] Preferably, the radial drive unit is a motor, the connecting rod is threaded to the output shaft of the motor, the positioning seat is provided with a guide rod passing through the connecting rod, and the connecting rod is slidably connected to the guide rod.

[0011] Preferably, the worktable is provided with a tailstock push rod that can move up and down below the positioning seat. The top end of the tailstock push rod can extend into the positioning hole and drive all the limiting blocks to synchronously overcome the force of the return spring and open outward. The tailstock push rod is located below the limiting blocks. The worktable is provided with a control cylinder that drives the tailstock push rod to move. The piston rod of the control cylinder is detachably connected to the tailstock push rod.

[0012] Preferably, the top end of the tailstock push rod is provided in the form of a frustum, and the limiting block is provided with an inclined surface on the side near the center of the positioning hole that cooperates with the top end of the tailstock push rod.

[0013] Preferably, it also includes a CNC system, wherein the motor and the control cylinder are both connected to the CNC system via signals; the CNC system has pre-stored target clamping coordinate data corresponding to workpieces of different diameters, and can control all radial drive units to move synchronously to drive each clamping block to move to the target coordinates, thereby realizing automatic centering and clamping of workpieces of different diameters.

[0014] Preferably, the CNC system is configured to execute the following clamping control process: The control cylinder drives the tailstock push rod to descend, causing the limiting block to retract under the action of the return spring, and the workpiece is placed in; The control cylinder drives the tailstock push rod to rise, and the top of the tailstock push rod drives all the limiting blocks to open outward synchronously, so as to initially position and support the workpiece from the inside. Based on the selected workpiece diameter, the pre-stored target clamping coordinate data is called, and all radial drive units are controlled to synchronously drive the clamping block to move, thereby centering and clamping the workpiece from the outside.

[0015] In summary, this application includes at least one of the following beneficial effects: 1. This application achieves automatic centering and clamping of workpieces of different diameters by setting up a radial drive unit (such as a motor) and clamping components that are coordinated and controlled by a CNC system. Specifically, the CNC system has pre-stored target clamping coordinates corresponding to workpieces of different diameters. During processing, the target coordinates can be directly called and the clamping blocks can be driven to move synchronously to the target position without the need for manual replacement or adjustment of the fixture. This greatly reduces the downtime caused by changing the fixture and significantly improves the processing efficiency. 2. In addition, this application uses the tailstock push rod to drive the circumferentially distributed limiting blocks to expand outward synchronously, performing initial positioning and support on the bottom of the workpiece (milling cutter blank), and initially establishing the rotation center of the workpiece; subsequently, under the control of the CNC system, the two radial drive units drive the clamping blocks to clamp from the outside to the center synchronously, completing precise centering and clamping. This positioning method can effectively avoid positioning errors that may be introduced by frequent changes of fixtures, ensuring the stability of the workpiece rotation center and the high consistency of product geometric accuracy (such as spiral grooves and cutting edge runout) in batch processing; 3. The combination of the return spring and the limiting block in this application enables the positioning seat itself to have a certain diameter self-adaptation capability. Combined with the automatically adjustable clamping component, the CNC milling machine can adapt to the machining of milling cutters of different diameters within a certain size range, enhancing the versatility of the equipment. At the same time, from the automatic internal support of the limiting block after the workpiece is placed in, the initial positioning driven by the tailstock push rod, to the automatic centering and clamping of the external clamping block, the entire process can be completed automatically or semi-automatically under the control of the CNC system, simplifying the operation steps and reducing machining errors caused by human intervention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the CNC milling machine in this embodiment of the present application; Figure 2 yes Figure 1 Enlarged view of point A; Figure 3 This is a partial cross-sectional schematic diagram of the connection between the positioning seat, the limiting block, and the clamping member in this embodiment of the application.

[0017] Explanation of reference numerals in the attached drawings: 1. Machine body; 2. Worktable; 21. Opening and closing door; 3. Positioning seat; 4. Positioning insertion hole; 5. Limiting block; 51. First stop block; 52. Inclined surface; 6. Clamping component; 61. Clamping block; 611. Arc clamping surface; 62. Radial drive unit; 63. Connecting rod; 64. Guide rod; 7. Return spring; 71. Receiving groove; 711. Second stop block; 8. Tailstock push rod; 81. Control cylinder. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] In addition, the term "multiple" should mean two or more.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] This application discloses a CNC milling machine for machining milling cutters, including a machine body 1, a worktable 2 disposed on the machine body 1, and a CNC system. The worktable 2 has a positioning seat 3 for placing the workpiece to be machined. The positioning seat 3 has a positioning insertion hole 4, and four limiting blocks 5 are spaced apart within the positioning insertion hole 4, distributed circumferentially along the positioning insertion hole 4. The multiple limiting blocks 5 are used for initial positioning of the workpiece to be machined. Two clamping members 6 are spaced apart above the positioning seat 3 for clamping and fixing the workpiece to be machined; the CNC system controls the movement of the clamping members 6.

[0025] Specifically, the limiting block 5 is slidably connected within the positioning seat 3. The positioning seat 3 is provided with an elastic element for driving the limiting block 5 to slide towards the center of the positioning hole 4. The elastic element is a return spring 7. The positioning seat 3 has a receiving groove 71 that completely accommodates the limiting block 5 and the return spring 7. The limiting block 5 has a first stop 51, and the opening of the receiving groove 71 has a second stop 711 for the first stop 51 to abut against. When the limiting block 5 slides to the point where the first stop 51 abuts against the second stop 711, the limiting block 5 stops sliding, thereby preventing the limiting block 5 from disengaging from the receiving groove 71. During installation, one end of the return spring 7 abuts against the inner wall of the receiving groove 71, and the other end abuts against the side wall of the first stop 51.

[0026] Furthermore, the worktable 2 is located below the positioning seat 3 and is equipped with a tailstock push rod 8 that can move up and down. The top of the tailstock push rod 8 is set in a frustum structure. The end of the limiting block 5 that extends into the positioning insertion hole 4 is provided with an inwardly protruding hook part, so that the side of the limiting block 5 near the center of the positioning insertion hole 4 has an inclined surface 52 that matches the top of the tailstock push rod 8, so that the tailstock push rod 8 drives the four circumferentially distributed limiting blocks 5 to expand outward synchronously, to initially position and support the bottom part of the workpiece (milling cutter blank), and initially establish the rotation center of the workpiece.

[0027] Furthermore, the worktable 2 is equipped with a control cylinder 81 that controls the up-and-down movement of the tailstock push rod 8. The piston rod of the control cylinder 81 is detachably connected to the bottom of the tailstock push rod 8 for easy replacement of the tailstock push rod 8. The tailstock push rod 8 can be fixed to the piston rod by a threaded connection or magnetic attraction. Initially, the tailstock push rod 8 is located below the limiting block 5. After the workpiece is processed, the control cylinder 81 drives the tailstock push rod 8 to move upwards until it extends into the positioning insertion hole 4, until the workpiece is completely ejected from the positioning insertion hole 4 for easy material removal. In addition, the worktable 2 has a hollow internal structure design, which can also be used to collect debris. A cleaning port is opened on one side of the worktable 2, and a hinged door 21 is connected to the cleaning port.

[0028] The clamping component 6 includes a clamping block 61, a radial drive unit 62 for driving the clamping block 61 to move radially along the workpiece, and a connecting rod 63 for connecting the clamping block 61 and the radial drive unit 62. The clamping block 61 has an arc-shaped clamping surface 611 corresponding to the outer circle of the workpiece on the side facing the workpiece. The clamping block 61 is detachably connected to the connecting rod 63 by bolts or by magnetic attraction. The radial drive unit 62 is a motor, and the connecting rod 63 is threadedly connected to the output shaft of the motor. A guide rod 64 passes through the connecting rod 63 within the positioning seat 3, and the connecting rod 63 is slidably connected to the guide rod 64.

[0029] Furthermore, both the motor and the control cylinder 81 are connected to the CNC system via signals. The CNC system has pre-stored target clamping coordinate data corresponding to workpieces of different diameters and can control all radial drive units 62 to move synchronously, thereby driving each clamping block 61 to move to the target coordinates and realizing automatic centering and clamping of workpieces of different diameters.

[0030] Furthermore, the CNC system is configured to execute the following clamping control process: The control cylinder 81 drives the tailstock push rod 8 to descend, causing the limiting block 5 to retract under the action of the return spring 7, and inserting the workpiece; The control cylinder 81 drives the tailstock push rod 8 to rise, and through the top of the tailstock push rod 8, all the limiting blocks 5 are driven to open outward synchronously, so as to initially position and support the workpiece from the inside. Based on the selected workpiece diameter, the pre-stored target clamping coordinate data is called, and all radial drive units 62 are controlled to synchronously drive the clamping block 61 to move, thereby centering and clamping the workpiece from the outside.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A CNC milling machine for machining milling cutters, comprising a machine body (1) and a worktable (2) disposed on the machine body (1), characterized in that: The workbench (2) is provided with a positioning seat (3), the positioning seat (3) has a positioning hole (4), and a limiting block (5) is provided at intervals in the positioning hole (4). Multiple limiting blocks (5) are distributed around the positioning hole (4). The limiting blocks (5) are slidably disposed in the positioning seat (3). The positioning seat (3) is provided with an elastic element for driving the limiting block (5) to slide towards the center of the positioning hole (4). At least two clamping members (6) are spaced apart above the positioning seat (3). The clamping member (6) includes a clamping block (61) and a radial drive unit (62) that drives the clamping block (61) to move radially along the workpiece.

2. The CNC milling machine for machining milling cutters according to claim 1, characterized in that: The elastic element is a return spring (7). The positioning seat (3) has a receiving groove (71) that fully accommodates the limiting block (5) and the return spring (7). The limiting block (5) includes a first stop (51). The groove of the receiving groove (71) is provided with a second stop (711) for the first stop (51) to abut. One end of the return spring (7) abuts against the inner wall of the receiving groove (71), and the other end of the return spring (7) abuts against the first stop (51).

3. A CNC milling machine for machining milling cutters according to claim 2, characterized in that: The end of the limiting block (5) that extends into the positioning hole (4) is provided with an inwardly protruding hook.

4. A CNC milling machine for machining milling cutters according to claim 1, characterized in that: The clamping block (61) has an arc clamping surface (611) on one side facing the workpiece, which corresponds to the outer circle of the workpiece.

5. A CNC milling machine for machining milling cutters according to claim 4, characterized in that: The clamping member (6) further includes a connecting rod (63) for connecting the clamping block (61) and the radial drive unit (62), wherein the clamping block (61) and the connecting rod (63) are detachably connected.

6. A CNC milling machine for machining milling cutters according to claim 2, characterized in that: The radial drive unit (62) is a motor, the connecting rod (63) is threaded to the output shaft of the motor, and the positioning seat (3) is provided with a guide rod (64) passing through the connecting rod (63), and the connecting rod (63) is slidably connected to the guide rod (64).

7. A CNC milling machine for machining milling cutters according to claim 2, characterized in that: The workbench (2) is located below the positioning seat (3) and is equipped with a tailstock push rod (8) that can move up and down. The top end of the tailstock push rod (8) can extend into the positioning hole (4) and drive all the limiting blocks (5) to overcome the force of the return spring (7) and open outward. The tailstock push rod (8) is located below the limiting block (5). The workbench (2) is equipped with a control cylinder (81) that drives the tailstock push rod (8) to move. The piston rod of the control cylinder (81) is detachably connected to the tailstock push rod (8).

8. A CNC milling machine for machining milling cutters according to claim 7, characterized in that: The top of the tailstock push rod (8) is set in a frustum structure, and the limiting block (5) has an inclined surface (52) on the side near the center of the positioning hole (4) that matches the top of the tailstock push rod (8).

9. A CNC milling machine for machining milling cutters according to claim 6, characterized in that: It also includes a CNC system, and the motor and control cylinder (81) are both connected to the CNC system signal; the CNC system has pre-stored target clamping coordinate data corresponding to workpieces of different diameters, and can control all radial drive units (62) to move synchronously, so as to drive each clamping block (61) to move to the target coordinates, thereby realizing automatic centering and clamping of workpieces of different diameters.

10. A CNC milling machine for machining milling cutters according to claim 9, characterized in that: The CNC system is configured to execute the following clamping control process: The control cylinder (81) drives the tailstock push rod (8) to descend, causing the limiting block (5) to retract under the action of the return spring (7) and insert the workpiece; The control cylinder (81) drives the tailstock push rod (8) to rise, and drives all the limiting blocks (5) to expand outward synchronously through the top of the tailstock push rod (8), so as to initially position and support the workpiece from the inside. Based on the selected workpiece diameter, the pre-stored target clamping coordinate data is called, and all radial drive units (62) are controlled to synchronously drive the clamping block (61) to move, thereby centering and clamping the workpiece from the outside.

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