Milling device for machining metal workpiece

Abstract

The invention relates to the technical field of metal processing, in particular to a milling device for processing a metal workpiece, which comprises a base assembly, a slide rail, a rotary clamping assembly, a positioning adjusting assembly and an angle adjusting assembly. The base assembly comprises a bottom plate and a supporting frame, the sliding rail is arranged along the bottom plate, the rotary clamping assembly is installed on the supporting frame and used for fixing and driving a workpiece to rotate, the positioning adjusting assembly achieves accurate positioning through a sliding platform, and the angle adjusting assembly adjusts the angle of a milling head through a rotary disc. The clamp adopts the design of the arc-shaped clamping pieces and the elastic buffer layer, adapts to workpieces with different sizes and protects the surfaces. The sliding platform reduces friction through balls, the locking mechanism ensures stability, and the water tank and the dust suction nozzle integrate cooling and scrap collecting functions. The workpiece clamping flexibility, the angle adjusting precision and the overall machining efficiency can be improved, and the efficient precision machining requirement of the modern industry is met.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to a milling device for processing metal workpieces. Background Art

[0002] With the continuous development of metalworking technology, milling devices, as important equipment for machining metal workpieces, have a direct impact on machining efficiency, precision, and surface quality. However, existing milling devices still have many shortcomings in terms of structural design, functional flexibility, and operational ease, making it difficult to meet the needs of efficient and precise machining.

[0003] After searching, a milling device with the publication number CN106514261B disclosed a related technical solution. The patent relates to a milling device, including a machine base, a drive assembly and a milling assembly. The machine base is composed of a base, two crossbeams and a mounting beam. The drive assembly realizes displacement control through a lifting cylinder and a sliding block, and the milling assembly is connected to the milling cutter through a spindle for processing. In addition, a positioning assembly is provided on the work table, including a rotating cylinder and a rotating disk for fixing the workpiece. However, in this technical solution, the positioning assembly is mainly used to realize a simple rotary clamping function, and the adjustment ability is limited when dealing with complex curved surfaces or special-shaped workpieces. At the same time, the equipment is not equipped with a special angle adjustment mechanism, which means that the angle adjustment of the milling head needs to rely on mechanical disassembly and assembly, affecting the operating efficiency.

[0004] The above problems indicate that the existing milling device still has room for improvement in terms of workpiece clamping flexibility, angle adjustment capability and overall structural integration. Therefore, it is urgent to invent a milling device for processing metal workpieces to solve one of the above problems. Summary of the Invention

[0005] In order to solve one of the above technical problems, the present invention provides a milling device for processing metal workpieces, which aims to improve the functional diversity and operational convenience of the device by optimizing the design of the base assembly, rotary clamping assembly, positioning adjustment assembly and angle adjustment assembly, so as to better adapt to the modern industry's demand for efficient and precise metal processing.

[0006] The milling device for processing a metal workpiece provided by the present invention comprises:

[0007] A base assembly, comprising a bottom plate and a support frame. The bottom plate is a rectangular structure. The support frame is vertically fixed to one end of the bottom plate, and a horizontally extending crossbeam is provided on the top of the support frame. The bottom of the bottom plate is connected to a plurality of support feet by screw threads for adjusting the overall height and levelness of the device.

[0008] At least one slide rail is provided in the length direction of the bottom plate;

[0009] A rotary clamping assembly, provided on the support frame, for clamping and driving the workpiece to rotate;

[0010] A positioning adjustment component is provided on the slide rail and is used to achieve precise positioning of the workpiece;

[0011] The angle adjustment component is arranged on the positioning adjustment component and is used to adjust the milling angle.

[0012] Furthermore, the rotary clamping assembly includes a main shaft, a clamp and a drive mechanism. The main shaft passes through the support frame and is rotatably connected to the support frame. One end of the main shaft extends out of the support frame and is connected to the drive mechanism, and the other end is fixedly connected to the clamp. A plurality of arc-shaped clips are slidably connected to the clamp. The plurality of arc-shaped clips are distributed in a ring and surround a receiving cavity for clamping the workpiece. A strong spring is provided between the arc-shaped clip and the clamp, so that the arc-shaped clip can automatically adjust the clamping force according to the shape of the workpiece. The inner wall of the arc-shaped clip is provided with an elastic buffer layer to reduce damage to the workpiece surface during the clamping process.

[0013] Furthermore, the positioning and adjustment assembly includes a sliding platform and a locking mechanism. The sliding platform is arranged on the slide rail and can be moved along the length direction of the base plate via the slide rail to achieve longitudinal positioning of the workpiece. A column is rotatably mounted on the top of the sliding platform, and a milling head is detachably mounted on the side of the column for processing the workpiece. The locking mechanism includes a plurality of screws and a plurality of locking blocks. The screws pass through the sliding platform and are threadedly connected to the sliding platform. The locking blocks are fixed to the bottom of the screws. When the screws are tightened, the locking blocks contact the base plate, thereby fixing the sliding platform in a predetermined position.

[0014] Furthermore, the angle adjustment assembly includes a turntable and a limiting mechanism. The turntable is mounted on top of the column and fixedly connected to the column. The limiting mechanism includes a positioning pin and multiple positioning holes. The positioning pin passes through the turntable and is inserted into the positioning holes on the sliding platform to limit the rotation range of the turntable. The number of positioning holes is at least three, and they are evenly distributed on the sliding platform to meet the needs of different angle adjustments.

[0015] Furthermore, the clamp also includes an adjusting bolt, which passes through the outer wall of the clamp and is threadedly connected to the clamp. The inner end of the adjusting bolt contacts the arc-shaped clamping piece for manually fine-tuning the clamping force.

[0016] Furthermore, the driving mechanism includes a motor and a transmission gear set, the motor is fixed to one side of the support frame, the transmission gear set includes a driving gear and a driven gear, the driving gear is fixedly connected to the output shaft of the motor, and the driven gear is fixedly connected to the main shaft, thereby transmitting the power of the motor to the main shaft to drive the workpiece to rotate.

[0017] Furthermore, the bottom of the sliding platform is provided with a ball groove, in which multiple balls are embedded. The balls contact the slide rails to reduce friction between the sliding platform and the slide rails, thereby improving the smoothness of movement. The bottom of the sliding platform is also provided with multiple scrapers, which contact the bottom plate and are used to clean debris on the bottom.

[0018] Furthermore, the limiting mechanism also includes an elastic member, which is sleeved on the outside of the positioning pin. One end of the elastic member is fixedly connected to the top of the turntable, and the other end is fixedly connected to the top of the positioning pin, for providing a rebound force when the positioning pin is not inserted into the positioning hole to prevent the positioning pin from falling off accidentally.

[0019] Furthermore, the column is equipped with a water tank equipped with an electric nozzle located above the milling head to spray coolant into the machining area, reducing temperatures and tool wear during machining. A dust collection nozzle is also provided on the column, located below the milling head, to collect metal chips and dust generated during machining, maintaining a clean working environment.

[0020] Furthermore, a scale plate is provided on the top of the turntable, and the scale plate is marked with angle scales to facilitate precise adjustment of the angle of the milling head.

[0021] Compared with the related art, the milling device for processing metal workpieces provided by the present invention has the following beneficial effects:

[0022] When a workpiece is placed in the fixture, the curved jaws automatically adjust the clamping force via a powerful spring. Adjusting bolts can further fine-tune the clamping force, ensuring the workpiece does not loosen or become damaged during machining. The presence of an elastic buffer effectively reduces pressure on the workpiece surface during clamping, preventing scratches or deformation.

[0023] The movement of the sliding platform and the locking mechanism allow the workpiece to be precisely positioned along the length of the baseplate. The ball bearing and scraper design significantly enhances the platform's efficiency and stability. The combination of a turntable and a limiter mechanism allows for more flexible angle adjustment of the milling head, and the introduction of a graduated dial further enhances accuracy.

[0024] In addition, the configuration of the water tank and dust suction nozzle not only extends the service life of the tool, but also improves the working environment and reduces the threat of dust to the health of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. The illustrative embodiments of this application and their description are used to explain this application and do not constitute an improper limitation of this application.

[0026] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention;

[0028] Figure 3 This is a schematic diagram of a first partial three-dimensional structure of the present invention;

[0029] Figure 4 This is a schematic diagram of a second partial three-dimensional structure of the present invention;

[0030] Figure 5 This is a schematic diagram of a third partial three-dimensional structure of the present invention;

[0031] Figure 6 is a schematic diagram of a fourth partial three-dimensional structure of the present invention;

[0032] Icons: 1. Base assembly; 2. Slide rail; 3. Spindle; 4. Clamp; 5. Drive mechanism; 6. Arc-shaped clip; 61. Strong spring; 62. Elastic buffer layer; 7. Sliding platform; 8. Locking mechanism; 9. Column; 10. Milling head; 11. Screw; 12. Locking block; 13. Turntable; 14. Limiting mechanism; 15. Locating pin; 16. Locating hole; 17. Adjusting bolt; 18. Ball bearing; 19. Elastic part; 20. Water tank; 21. Electric nozzle; 22. Dust nozzle; 23. Dial. DETAILED DESCRIPTION

[0033] The present invention provides a milling device for processing metal workpieces, the structure of which is as follows Figure 1 and Figure 2 As shown, it comprises a base assembly 1, a rotating clamping assembly, a positioning adjustment assembly and an angle adjustment assembly. Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] like Figure 1 and Figure 2As shown, the base assembly 1 includes a base plate and a support frame. The base plate is a rectangular structure. The support frame is vertically fixed to one end of the base plate, and a horizontally extending beam is provided on the top of the support frame for carrying other components. The bottom of the base plate is connected to a plurality of support feet by threads, and the height adjustment between the support feet and the base plate is achieved by threaded cooperation, thereby ensuring the overall horizontality of the device. The slide rail 2 is arranged along the length direction of the base plate. The slide rail 2 is fixed to the base plate by bolts. The surface of the slide rail 2 is polished to reduce the friction coefficient. The rotary clamping assembly is installed on the support frame for clamping and driving the workpiece to rotate. The positioning adjustment assembly is arranged on the slide rail 2 for achieving precise positioning of the workpiece. The angle adjustment assembly is installed on the positioning adjustment assembly for adjusting the milling angle.

[0035] The specific structure of the rotating clamping assembly is as follows Figure 3 As shown, the rotary clamping assembly includes a main shaft 3, a clamp 4 and a driving mechanism 5. The main shaft 3 passes through the support frame and is rotatably connected to the support frame. One end of the main shaft 3 extends out of the support frame and is connected to the driving mechanism 5, and the other end is fixedly connected to the clamp 4. A plurality of arc-shaped clips 6 are slidably connected to the clamp 4. The plurality of arc-shaped clips 6 are distributed in a ring shape and surround a receiving cavity for clamping the workpiece. A strong spring 61 is provided between the arc-shaped clip 6 and the clamp 4. The strong spring 61 is sleeved on the outside of the arc-shaped clip 6, and its two ends are in contact with the outer walls of the arc-shaped clip 6 and the clamp 4 respectively, so that the arc-shaped clip 6 can automatically adjust the clamping force according to the shape of the workpiece. The inner wall of the arc-shaped clip 6 is provided with an elastic buffer layer 62. The elastic buffer layer 62 is made of rubber material and is fixed to the inner wall of the arc-shaped clip 6 by bonding to reduce damage to the workpiece surface during the clamping process.

[0036] The specific structure of the positioning adjustment component is as follows Figure 4 and Figure 5 As shown, the positioning and adjustment assembly includes a sliding platform 7 and a locking mechanism 8. The sliding platform 7 is arranged on the slide rail 2 and can be moved along the length direction of the base plate through the slide rail 2 to achieve longitudinal positioning of the workpiece. A column 9 is rotatably mounted on the top of the sliding platform 7, and a milling head 10 is detachably mounted on the side of the column 9 for processing the workpiece. The locking mechanism 8 includes a plurality of screws 11 and a plurality of locking blocks 12. The screw 11 passes through the sliding platform 7 and is threadedly connected to the sliding platform 7. The locking block 12 is fixed to the bottom of the screw 11. When the screw 11 is tightened, the locking block 12 contacts the base plate, thereby fixing the sliding platform 7 in a predetermined position.

[0037] The specific structure of the angle adjustment component is as follows Figure 6As shown, the angle adjustment assembly includes a turntable 13 and a limiting mechanism 14. The turntable 13 is mounted on top of the column 9 and fixedly connected to the column 9. The limiting mechanism 14 includes a positioning pin 15 and multiple positioning holes 16. The positioning pin 15 passes through the turntable 13 and is inserted into the positioning holes 16 on the sliding platform 7 to limit the rotation range of the turntable 13. There are at least three positioning holes 16, evenly distributed on the sliding platform 7, to meet the needs of adjusting different angles.

[0038] In addition, the clamp 4 also includes an adjusting bolt 17, which passes through the outer wall of the clamp 4 and is threadedly connected to the clamp 4. The inner end of the adjusting bolt 17 contacts the arc-shaped clamping piece 6. By rotating the adjusting bolt 17, the clamping force can be manually fine-tuned. Figure 3 shown.

[0039] In addition, the driving mechanism 5 includes a motor and a transmission gear set. The motor is fixed to one side of the support frame. The transmission gear set includes a driving gear and a driven gear. The driving gear is fixedly connected to the output shaft of the motor, and the driven gear is fixedly connected to the main shaft 3, thereby transmitting the power of the motor to the main shaft 3 to drive the workpiece to rotate. Figure 3 shown.

[0040] In addition, a ball groove is provided at the bottom of the sliding platform 7, and a plurality of balls 18 are embedded in the ball groove. The balls 18 are in contact with the slide rail 2. The depth of the ball groove is slightly larger than the radius of the balls 18 to ensure that the balls 18 will not fall out when rolling in the groove. The bottom of the sliding platform 7 is also provided with a plurality of scrapers, which are in contact with the bottom plate and are used to clean the debris on the bottom plate. Figure 5 shown.

[0041] In addition, the limiting mechanism 14 also includes an elastic member 19, which is sleeved on the outside of the positioning pin 15. One end of the elastic member 19 is fixedly connected to the top of the turntable 13, and the other end is fixedly connected to the top of the positioning pin 15. It is used to provide a rebound force when the positioning pin 15 is not inserted into the positioning hole 16 to prevent the positioning pin 15 from accidentally falling off. Figure 6 shown.

[0042] In addition, a water tank 20 is provided on the column 9, which is equipped with an electric nozzle 21. The electric nozzle 21 is located above the milling head 10 and is used to spray coolant into the processing area to reduce the temperature during the processing and reduce tool wear. A dust suction nozzle 22 is also provided on the column 9 and is located below the milling head 10 to collect metal debris and dust generated during the processing, thereby maintaining a clean working environment.

[0043] In addition, a scale plate 23 is provided on the top of the turntable 13. The scale plate 23 is marked with angle scales to facilitate the operator to accurately adjust the angle of the milling head.

[0044] In actual application, the height and level of the base assembly 1 are first adjusted using the support feet. The workpiece is then placed in the accommodating cavity of the fixture 4. The arc-shaped clamp 6 automatically adjusts the clamping force through the action of the strong spring 61. At the same time, the clamping force is fine-tuned by adjusting the bolt 17 to ensure that the workpiece does not loosen or become damaged during the machining process. After starting the drive mechanism 5, the motor drives the driving gear to rotate. The driving gear transmits power to the main shaft 3 through the transmission gear set. The main shaft 3 drives the fixture 4 to rotate, thereby rotating the workpiece. Next, the sliding platform 7 moves along the slide rail 2 to adjust the workpiece to the desired position. The design of the ball bearing 18 reduces the friction between the sliding platform 7 and the slide rail 2, and the scraper cleans the debris on the bottom plate to ensure smooth movement of the sliding platform 7. When the workpiece reaches the predetermined position, the sliding platform 7 is fixed to the slide rail 2 by the locking mechanism 8. Subsequently, the angle of the milling head is adjusted using the angle adjustment assembly. The operator can precisely adjust the position of the turntable 13 according to the angle scale on the dial 23 and fix the turntable 13 using the limit mechanism 14. During the processing, the coolant in the water tank 20 is sprayed to the processing area through the electric nozzle 21 to reduce the processing temperature and reduce tool wear. The dust suction nozzle is connected to the external system and collects metal debris and dust generated during the processing to keep the working environment clean.

[0045] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is further supplemented below in combination with a specific application scenario.

[0046] First, the operator adjusts the height and level of the base assembly 1 through the support feet. The support feet and the base plate are threaded together to achieve fine-tuning of the height, ensuring that the entire device is in a horizontal state. In this step, the design of the support feet enables the device to adapt to different ground conditions and avoid a decrease in processing accuracy due to uneven ground. Subsequently, the metal workpiece to be processed is placed in the accommodating cavity of the arc-shaped clamp 6. The arc-shaped clamp 6 automatically adjusts the clamping force through the action of the strong spring 61 and forms an initial stable clamping state. At this time, the elastic buffer layer 62 is in contact with the surface of the workpiece, reducing possible damage during the clamping process. If the clamping force needs to be further adjusted, the inner end of the adjusting bolt 17 can be rotated to push the arc-shaped clamp 6 to move, thereby achieving manual fine-tuning of the clamping force. This double clamping mechanism ensures that the workpiece will neither loosen nor be damaged due to excessive clamping force during the processing process.

[0047] Next, the motor in drive mechanism 5 is activated, and its output shaft connects to the driving gear, which in turn rotates the driven gear, transmitting power to spindle 3. Spindle 3 drives fixture 4, causing the workpiece to rotate at a set speed. This transmission method achieves efficient power transmission through the gear train while ensuring smooth rotation. Throughout this process, the annularly distributed arc-shaped jaws 6 of fixture 4 maintain a uniform grip on the workpiece, preventing workpiece displacement caused by centrifugal force generated by rotation.

[0048] Subsequently, the sliding platform 7 moves along the slide rail 2 to adjust the workpiece to the predetermined processing position. A plurality of balls 18 are embedded in the ball groove at the bottom of the sliding platform 7. The balls 18 contact and roll with the slide rail 2, which significantly reduces the friction between the sliding platform 7 and the slide rail 2 and improves the smoothness of movement. At the same time, the scraper cleans the debris on the bottom plate to prevent the accumulation of debris from affecting the movement stability of the sliding platform 7. When the workpiece reaches the target position, the position of the sliding platform 7 is fixed by the locking mechanism 8. Specifically, tightening the screw 11 causes the locking block 12 to contact the slide rail 2, thereby firmly fixing the sliding platform 7 on the slide rail 2. This locking method is simple and reliable, and can maintain the stability of the sliding platform 7 under high-intensity processing conditions.

[0049] After completing the position adjustment, the operator adjusts the angle of the milling head through the angle adjustment assembly. The turntable 13 rotates synchronously with the column 9, and the operator can accurately adjust the position of the turntable 13 according to the angle scale on the dial 23. The positioning pin 15 in the limit mechanism 14 is inserted into the positioning hole 16 on the sliding platform 7 to limit the rotation range of the turntable 13 and ensure the accuracy of the angle adjustment. The elastic member 19 provides a rebound force when the positioning pin 15 is not inserted into the positioning hole 16 to prevent the positioning pin 15 from accidentally falling off, thereby improving the reliability of the angle adjustment. In this way, the milling head 10 can be quickly and accurately adjusted to the required angle to meet the processing requirements of complex curved surfaces or special-shaped workpieces.

[0050] During machining, coolant from the water tank 20 is sprayed onto the machining area via an electric nozzle 21. The coolant spray direction has been optimized to cover the contact area between the milling head 10 and the workpiece, effectively lowering machining temperatures and minimizing tool wear. A dust collection nozzle 22 is located below the milling head 10 and is connected to an external vacuum system via a pipe to promptly collect metal debris and dust generated during machining. The nozzle 22 is positioned so that it can efficiently capture debris, preventing it from accumulating and impacting machining quality.

[0051] In summary, the present invention achieves efficient and precise machining of metal workpieces through the above steps. The coordinated operation of various components not only enhances the functional diversity of the device, but also significantly improves operational convenience and machining stability, fully meeting the needs of modern industry for high-precision metal machining.

[0052] Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present disclosure.

[0053] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0055] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0056] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A milling device for processing a metal workpiece, characterized in that: include: A base assembly (1), the base assembly (1) comprising a bottom plate and a support frame, the bottom plate being a rectangular structure, the support frame being vertically fixed to one end of the bottom plate, a horizontally extending crossbeam being provided on the top of the support frame, and a plurality of support legs being connected to the bottom of the bottom plate via threads; At least one slide rail (2) is provided in the length direction of the bottom plate; A rotary clamping assembly, provided on the support frame, for clamping and driving the workpiece to rotate; A positioning adjustment component is provided on the slide rail (2) and is used to achieve precise positioning of the workpiece; The angle adjustment component is arranged on the positioning adjustment component and is used to adjust the milling angle.

2. The milling device for machining a metal workpiece according to claim 1, wherein: The rotary clamping assembly comprises a main shaft (3), a clamp (4) and a driving mechanism (5); the main shaft (3) passes through the support frame and is rotatably connected to the support frame; one end of the main shaft (3) extends out of the support frame and is connected to the driving mechanism (5); the other end is fixedly connected to the clamp (4); a plurality of arc-shaped clips (6) are slidably connected to the clamp (4); the plurality of arc-shaped clips (6) are distributed in a ring shape and surround a receiving cavity; a strong spring (61) is provided between the arc-shaped clip (6) and the clamp (4); and an elastic buffer layer (62) is provided on the inner wall of the arc-shaped clip (6).

3. The milling device for machining a metal workpiece according to claim 1, characterized in that: The positioning and adjusting assembly includes a sliding platform (7) and a locking mechanism (8). The sliding platform (7) is arranged on the slide rail (2) and can be moved along the length direction of the base plate through the slide rail (2). A column (9) is rotatably installed on the top of the sliding platform (7). A milling head (10) is detachably installed on the side of the column (9). The locking mechanism (8) includes a plurality of screws (11) and a plurality of locking blocks (12). The screws (11) pass through the sliding platform (7) and are threadedly connected to the sliding platform (7). The locking block (12) is fixed to the bottom of the screws (11).

4. The milling device for machining a metal workpiece according to claim 3, wherein: The angle adjustment assembly comprises a turntable (13) and a limiting mechanism (14), wherein the turntable (13) is arranged on the top of the column (9) and fixedly connected to the column (9), and the limiting mechanism (14) comprises a positioning pin (15) and a plurality of positioning holes (16), wherein the positioning pin (15) passes through the turntable (13) and is inserted into the positioning holes (16) on the sliding platform (7), and the number of the positioning holes (16) is at least three and is evenly distributed on the sliding platform (7).

5. The milling device for machining a metal workpiece according to claim 2, wherein: The clamp (4) further comprises an adjusting bolt (17), the adjusting bolt (17) passing through the outer wall of the clamp (4) and being threadedly connected to the clamp (4), the inner end of the adjusting bolt (17) being in contact with the arc-shaped clamping piece (6).

6. The milling device for machining a metal workpiece according to claim 2, wherein: The driving mechanism (5) comprises a motor and a transmission gear set, wherein the motor is fixed to one side of the support frame, and the transmission gear set comprises a driving gear and a driven gear, wherein the driving gear is fixedly connected to the output shaft of the motor, and the driven gear is fixedly connected to the main shaft (3).

7. The milling device for machining a metal workpiece according to claim 1, characterized in that: The bottom of the sliding platform (7) is provided with a ball groove, and a plurality of balls (18) are embedded in the ball groove. The balls (18) are in contact with the slide rail (2). The bottom of the sliding platform (7) is also provided with a plurality of scrapers, and the scrapers are in contact with the bottom plate.

8. The milling device for machining a metal workpiece according to claim 4, characterized in that: The limiting mechanism (14) further comprises an elastic member (19), which is sleeved on the outside of the positioning pin (15), one end of the elastic member (19) is fixedly connected to the top of the turntable (13), and the other end is fixedly connected to the top of the positioning pin (15).

9. The milling device for machining a metal workpiece according to claim 3, characterized in that: The column (9) is also provided with a water tank (20), the water tank (20) is provided with an electric nozzle (21), the electric nozzle (21) is arranged above the milling head (10), and the column (9) is provided with a dust suction nozzle (22), the dust suction nozzle (22) is arranged below the milling head (10).

10. The milling device for machining a metal workpiece according to claim 4, characterized in that: A scale plate (23) is provided on the top of the rotating disk (13), and an angle scale is marked on the scale plate (23).

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