A high-precision CNC milling machine

Abstract

The present invention discloses a high-precision CNC milling machine, comprising a base, a column, a milling head and a worktable. A longitudinal adjustment mechanism and a transverse adjustment mechanism for driving the worktable to move horizontally are installed on the top wall of the base. The longitudinal adjustment mechanism is fixedly installed on the top wall of the base, and the transverse adjustment mechanism is slidably installed on the top of the longitudinal adjustment mechanism, and the worktable is slidably installed on the top of the transverse adjustment mechanism. The longitudinal adjustment mechanism and the transverse adjustment mechanism both include two symmetrically arranged fixed plates, and a threaded rod is rotatably installed between the two fixed plates. In the present invention, after the worktable moves to the processing position, the worktable is not only fixed by the locking force of the threaded engagement, but also a positioning mechanism is added to fix and position the worktable, thereby improving the stability of the worktable fixation, so as to prevent the tool from causing the workpiece and the worktable to shift in position when processing the workpiece on the worktable, thereby improving the processing accuracy of the CNC milling machine.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled milling machines, in particular to a high-precision numerically controlled milling machine. Background Art

[0002] A CNC milling machine is a milling machine controlled by electronic digital signals. During the operation of a CNC milling machine, various problems that affect the machining accuracy may arise, including backlash error, pitch error, and repeat positioning accuracy error. The accumulation of these errors will pose a huge challenge to the machining accuracy of the CNC milling machine, and become the key to improving and maintaining the high-precision machining effect of the CNC milling machine.

[0003] After searching, Chinese patent CN111266634B discloses a high-precision CNC milling machine, which includes a base, a column, a saddle, a workbench and a controller; a column is provided on one side of the base, and a milling head is provided on the column; a fixed saddle is provided on the base, and a workbench is provided on the saddle, and the controller controls the movement of the workbench through the saddle.

[0004] Although the above-mentioned high-precision CNC milling machine can reduce the influence of pitch error when the nut is driven bidirectionally on the screw rod, and reduce the amount of reverse clearance and the influence on repositioning accuracy, it still has the following shortcomings: after the worktable moves to the processing position, the worktable is fixed only by the locking force of the threaded engagement, and the fixation stability of the worktable is poor. Therefore, when the tool processes the workpiece on the worktable, it is easy to cause the workpiece and the worktable to shift in position, which will lead to poor processing accuracy of the CNC milling machine.

[0005] Therefore, a high-precision CNC milling machine is proposed. Summary of the invention

[0006] The object of the present invention is to provide a high-precision CNC milling machine, which solves the problems raised in the above-mentioned background technology by adding a positioning mechanism to fix the workbench.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-precision CNC milling machine comprises a base, a column, a milling head and a worktable, wherein a longitudinal adjustment mechanism and a transverse adjustment mechanism for driving the worktable to move horizontally are installed on the top wall of the base, the longitudinal adjustment mechanism is fixedly installed on the top wall of the base, the transverse adjustment mechanism is slidably installed on the top of the longitudinal adjustment mechanism, and the worktable is slidably installed on the top of the transverse adjustment mechanism, the longitudinal adjustment mechanism and the transverse adjustment mechanism each comprise two symmetrically arranged fixed plates, a threaded rod is rotatably installed between the two fixed plates, a servo motor for driving the threaded rod to rotate is installed at one end of one of the fixed plates, a transmission plate is threadedly connected on the threaded rod, two guide columns penetrating the transmission plates are symmetrically installed between the two fixed plates, two positioning plates cooperating with the transmission plates are symmetrically and movably installed between the two fixed plates, the two positioning plates are respectively located on both sides of the transmission plate, and the servo motor is powered off when the transmission plate contacts any positioning plate, a positioning mechanism is installed in the transmission plate, a transmission assembly is arranged between the servo motor and the positioning mechanism, and the positioning mechanism fixes the transmission plate when the servo motor is powered off, and a position adjustment assembly for driving the positioning plate to move is arranged between the two fixed plates.

[0009] When using the longitudinal adjustment mechanism, first use the position adjustment component to move the positioning plate to the appropriate position and fix it. After the servo motor is powered on, it can drive the threaded rod to rotate periodically. The threaded rod and the transmission plate are threadedly engaged with each other. Therefore, the periodic rotation of the threaded rod can drive the transmission plate and the transverse adjustment mechanism to move back and forth longitudinally. After the transmission plate moves to contact the positioning plate, the servo motor begins to lose power. At this time, the threaded rod stops rotating and the transmission plate and the transverse adjustment mechanism stop moving. Moreover, after the servo motor is powered off, the positioning mechanism can fix the transmission plate and the transverse adjustment mechanism in time. Similarly, the transverse adjustment mechanism can be used to move the top transmission plate and the worktable laterally to the appropriate position and fix them. The longitudinal adjustment mechanism and the transverse adjustment mechanism cooperate with each other to conveniently move the top worktable to the processing position and fix it. After the worktable moves to the processing position, it is not only fixed by the locking force of the threaded engagement, but also the positioning mechanism is added to fix the worktable, thereby improving the stability of the worktable fixation. Therefore, it can prevent the tool from causing the workpiece and the worktable to shift in position when processing the workpiece on the worktable, thereby improving the processing accuracy of the CNC milling machine.

[0010] Preferably, the servo motor is electrically connected to a knife switch, a first electromagnet is installed on one side of the knife switch, a positive connection electrode electrically connected to the first electromagnet is installed on one side of the two positioning plates close to the transmission plate, and a negative connection electrode cooperating with the positive connection electrode is installed on both sides of the transmission plate.

[0011] When the transmission plate contacts the positioning plate, the positive connection on the positioning plate is connected to the negative connection on the transmission plate. At this time, the first electromagnet is energized and the knife is sucked to one end of the first electromagnet. After the knife moves to the end close to the first electromagnet, the closed circuit connected to the servo motor is disconnected. After the transmission plate moves to a suitable position, the servo motor can be automatically turned off in time. This is not only convenient and quick to operate, but also improves the accuracy of the positioning of the transmission plate and the workbench, thereby improving the machining accuracy of the CNC milling machine.

[0012] Preferably, the positioning mechanism includes a second electromagnet installed in the transmission plate, the two guide columns are rectangular rods, and the second electromagnet is located between the two guide columns, two clamping iron blocks that cooperate with the guide columns are symmetrically and elastically installed in the transmission plate, and the two clamping iron blocks are respectively located on one side of the two guide columns, and two movable grooves that cooperate with the clamping iron blocks are symmetrically opened in the transmission plate, a first anti-slip pad is installed on the outer wall of the two clamping iron blocks on the side close to the guide column, and a second anti-slip pad that cooperates with the first anti-slip pad is installed on the outer wall of the two guide columns on the side close to the clamping iron block.

[0013] When the second electromagnet is energized, the two clamping iron blocks can be respectively sucked to the two ends of the second electromagnet. At this time, the first anti-skid pad on the clamping iron block will be tightly attached to the second anti-skid pad on one side of the guide column, and when the second electromagnet is energized, the two guide columns will also be sucked to the two ends of the second electromagnet, so that the first anti-skid pad, the clamping iron block, the second electromagnet and the transmission plate can be fixedly connected to the second anti-skid pad, the guide column and the fixed plate, so that the transmission plate and the workbench can be fixed, avoiding the workbench being fixed only by the locking force of the threaded engagement, improving the stability of the workbench fixation, and thus preventing the tool from causing the workpiece and the workbench to shift in position when processing the workpiece on the workbench, thereby improving the processing accuracy of the CNC milling machine.

[0014] Preferably, the transmission assembly includes a third electromagnet electrically connected to the servo motor, a rotating rod is rotatably installed on the top of the third electromagnet, the top of the rotating rod is provided with a first connecting end electrically connected to the second electromagnet, a second connecting end cooperating with the first connecting end is installed at one end of the rotating rod, and a reset spring is connected to the end of the rotating rod away from the second connecting end.

[0015] When the servo motor is powered on, the third electromagnet is powered on and will attract the rotating rod and the second connecting end at the top to rotate downward. After the second connecting end rotates downward, the second electromagnet is powered off and the positioning mechanism releases the fixation of the transmission plate, thereby facilitating the servo motor to drive the threaded rod to drive the transmission plate to move. After the servo motor is powered off, the reset spring will pull the rotating rod and the second connecting end to rotate upward and connect the second connecting end to the bottom end of the first connecting end. At this time, the second electromagnet is powered on and the positioning mechanism fixes the transmission plate. After the servo motor is powered off, the positioning mechanism can automatically and timely fix the transmission plate without manual adjustment. The degree of automation is high and the labor intensity of manual labor is reduced, and the use effect is good.

[0016] Preferably, the position adjustment assembly includes two screw rods symmetrically rotatably installed between two fixed plates, the two screw rods respectively pass through two positioning plates, and the two positioning plates are respectively threadedly engaged with the two screw rods, a stepper motor is installed at one end of the two screw rods close to the servo motor, and two guide rods are installed between the two fixed plates, and scale lines are provided on the two guide rods at equal distances.

[0017] The lead screw is threadedly engaged with the positioning plate, so the system controls the stepper motor and the lead screw to drive the positioning plate to move back and forth in the horizontal direction, so the positioning plate can be easily moved and fixed, and the scale lines on the guide rod can be easily observed to observe the positioning plate moving to the appropriate position, so the positioning plate can be easily moved to the specified position and fixed, and the operation is convenient and quick, thereby improving the convenience of using the position adjustment component and the CNC milling machine.

[0018] Preferably, the distance between the transmission plate at the top, the transmission plate at the bottom and the workbench at the top is no less than 30 cm.

[0019] The distance between the transmission plate at the top and the transmission plate at the bottom and the workbench at the top is large, so it is easy to visually observe the scale lines on the guide rod and the specific position of the positioning plate, which further enhances the convenience of adjusting the position of the positioning plate, thereby further improving the convenience of using the position adjustment component and the CNC milling machine.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. After the worktable moves to the processing position, it is not only fixed by the locking force of the thread engagement, but also fixed by a positioning mechanism, which improves the stability of the worktable fixation. Therefore, it can prevent the workpiece and the worktable from shifting when the tool processes the workpiece on the worktable, thereby improving the processing accuracy of the CNC milling machine.

[0022] 2. After the transmission plate moves to contact with the positioning plate, the servo motor can be automatically turned off in time. This is not only convenient and quick to operate, but also improves the accuracy of positioning the transmission plate and the workbench, thereby further improving the processing accuracy of the CNC milling machine.

[0023] 3. After the servo motor is powered off, the positioning mechanism can automatically and promptly fix the transmission plate without manual adjustment. It has a high degree of automation and reduces the labor intensity of manual labor, and has a good use effect.

[0024] 4. The positioning plate can be easily moved to the specified position and fixed, which is easy and quick to operate, thereby improving the convenience of using the position adjustment component and the CNC milling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 A top view of a workbench portion of the present invention;

[0027] Figure 3 A top view of the longitudinal adjustment mechanism and the transverse adjustment mechanism of the present invention;

[0028] Figure 4 It is a cross-sectional view of the top part structure of the longitudinal adjustment mechanism and the transverse adjustment mechanism of the present invention;

[0029] Figure 5 It is a cross-sectional view of the bottom end structure of the longitudinal adjustment mechanism and the transverse adjustment mechanism of the present invention;

[0030] Figure 6 It is a connection diagram of the electromagnet part of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the positioning mechanism part of the present invention.

[0032] In the figure: 1. base; 2. column; 3. milling head; 4. workbench; 5. fixing plate; 6. threaded rod; 7. servo motor; 8. transmission plate; 9. guide column; 10. positioning plate; 11. knife; 12. first electromagnet; 13. second electromagnet; 14. clamping iron block; 15. movable groove; 16. first anti-skid pad; 17. second anti-skid pad; 18. third electromagnet; 19. rotating rod; 20. first connecting end; 21. second connecting end; 22. reset spring; 23. screw rod; 24. stepping motor; 25. guide rod; 26. scale line. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figures 1 to 7 The present invention provides a high-precision CNC milling machine, and the technical solution is as follows:

[0037] A high-precision CNC milling machine includes a base 1, a column 2, a milling head 3 and a workbench 4. A longitudinal adjustment mechanism and a transverse adjustment mechanism for driving the workbench 4 to move horizontally are installed on the top wall of the base 1. The longitudinal adjustment mechanism is fixedly installed on the top wall of the base 1, and the transverse adjustment mechanism is slidably installed on the top of the longitudinal adjustment mechanism, and the workbench 4 is slidably installed on the top of the transverse adjustment mechanism. The longitudinal adjustment mechanism and the transverse adjustment mechanism both include two symmetrically arranged fixed plates 5, and a threaded rod 6 is rotatably installed between the two fixed plates 5. A servo motor 7 for driving the threaded rod 6 to rotate is installed at one end of one of the fixed plates 5. A transmission plate 8 is threadedly connected to the threaded rod 6, two guide columns 9 that penetrate the transmission plate 8 are symmetrically installed between the two fixed plates 5, and two positioning plates 10 that cooperate with the transmission plate 8 are symmetrically and movably installed between the two fixed plates 5. The two positioning plates 10 are respectively located on both sides of the transmission plate 8, and when the transmission plate 8 contacts any positioning plate 10, the servo motor 7 is powered off, a positioning mechanism is installed in the transmission plate 8, a transmission component is provided between the servo motor 7 and the positioning mechanism, and the positioning mechanism fixes the transmission plate 8 when the servo motor 7 is powered off, and a position adjustment component that drives the positioning plate 10 to move is provided between the two fixed plates 5.

[0038] When using the longitudinal adjustment mechanism, first use the position adjustment component to move the positioning plate 10 to a suitable position and fix it. After the servo motor 7 is powered on, it can drive the threaded rod 6 to rotate periodically. The threaded rod 6 and the transmission plate 8 are threadedly engaged with each other. Therefore, the periodic rotation of the threaded rod 6 can drive the transmission plate 8 and the lateral adjustment mechanism to move back and forth longitudinally. After the transmission plate 8 moves to contact with the positioning plate 10, the servo motor 7 starts to cut off power. At this time, the threaded rod 6 stops rotating and the transmission plate 8 and the lateral adjustment mechanism stop moving. Moreover, after the servo motor 7 is powered off, the positioning mechanism can fix the transmission plate 8 and the lateral adjustment mechanism in time. Similarly, The lateral adjustment mechanism is used to move the top transmission plate 8 and the workbench 4 laterally to the appropriate position and fix them. The longitudinal adjustment mechanism and the lateral adjustment mechanism cooperate with each other to conveniently move the top workbench 4 to the processing position and fix it. After the workbench 4 is moved to the processing position, it is not only fixed by the locking force of the threaded engagement, but also a positioning mechanism is added to fix the workbench 4, thereby improving the stability of the fixation of the workbench 4. Therefore, it can prevent the tool from causing the workpiece and the workbench 4 to shift in position when processing the workpiece on the workbench 4, thereby improving the processing accuracy of the CNC milling machine.

[0039] As an embodiment of the present invention, refer to Figure 3 and Figure 6 A knife switch 11 is electrically connected to the servo motor 7, and a first electromagnet 12 is installed on one side of the knife switch 11. A positive connection electrode electrically connected to the first electromagnet 12 is installed on one side of the two positioning plates 10 close to the transmission plate 8, and a negative connection electrode that cooperates with the positive connection electrode is installed on both sides of the transmission plate 8.

[0040] When the transmission plate 8 contacts the positioning plate 10, the positive connection on the positioning plate 10 is connected to the negative connection on the transmission plate 8. At this time, the first electromagnet 12 is energized and the knife 11 is sucked to one end of the first electromagnet 12. After the knife 11 moves to the end close to the first electromagnet 12, the closed circuit connected to the servo motor 7 is disconnected. After the transmission plate 8 moves to a suitable position, the servo motor 7 can be automatically turned off in time. It is not only convenient and quick to operate, but also improves the positioning accuracy of the transmission plate 8 and the workbench 4, thereby improving the machining accuracy of the CNC milling machine.

[0041] As an embodiment of the present invention, refer to Figure 3 , Figure 6 and Figure 7 The positioning mechanism includes a second electromagnet 13 installed in the transmission plate 8, the two guide columns 9 are both rectangular rods, and the second electromagnet 13 is located between the two guide columns 9, and two clamping iron blocks 14 that cooperate with the guide columns 9 are symmetrically and elastically installed in the transmission plate 8, and the two clamping iron blocks 14 are respectively located on one side of the two guide columns 9, and two movable grooves 15 that cooperate with the clamping iron blocks 14 are symmetrically provided in the transmission plate 8. The outer side walls of the two clamping iron blocks 14 on the side close to the guide column 9 are both installed with a first anti-slip pad 16, and the outer side walls of the two guide columns 9 on the side close to the clamping iron blocks 14 are both installed with a second anti-slip pad 17 that cooperates with the first anti-slip pad 16.

[0042] After the second electromagnet 13 is energized, the two clamping iron blocks 14 can be respectively sucked to the two ends of the second electromagnet 13. At this time, the first anti-skid pad 16 on the clamping iron block 14 will be tightly attached to the second anti-skid pad 17 on one side of the guide column 9, and after the second electromagnet 13 is energized, the two guide columns 9 will also be sucked to the two ends of the second electromagnet 13, so that the first anti-skid pad 16, the clamping iron block 14, the second electromagnet 13 and the transmission plate 8 can be fixedly connected to the second anti-skid pad 17, the guide column 9 and the fixed plate 5, so that the transmission plate 8 and the workbench 4 can be fixed, avoiding the workbench 4 being fixed only by the locking force of the threaded engagement, thereby improving the stability of the fixation of the workbench 4, and thus preventing the tool from causing the workpiece and the workbench 4 to shift in position when processing the workpiece on the workbench 4, thereby improving the processing accuracy of the CNC milling machine.

[0043] As an embodiment of the present invention, refer to Figure 6 The transmission assembly includes a third electromagnet 18 electrically connected to the servo motor 7, a rotating rod 19 is rotatably mounted on the top of the third electromagnet 18, a first connecting end 20 electrically connected to the second electromagnet 13 is provided on the top of the rotating rod 19, a second connecting end 21 cooperating with the first connecting end 20 is mounted on one end of the rotating rod 19, and a return spring 22 is connected to the end of the rotating rod 19 away from the second connecting end 21.

[0044] When the servo motor 7 is powered on, the third electromagnet 18 is powered on and will attract the rotating rod 19 and the second connecting end 21 at the top to rotate downward. After the second connecting end 21 rotates downward, the second electromagnet 13 is powered off and the positioning mechanism releases the fixation of the transmission plate 8, so that it is convenient for the servo motor 7 to drive the threaded rod 6 to drive the transmission plate 8 to move. After the servo motor 7 is powered off, the reset spring 22 will pull the rotating rod 19 and the second connecting end 21 to rotate upward and connect the second connecting end 21 to the bottom end of the first connecting end 20. At this time, the second electromagnet 13 is powered on and the positioning mechanism fixes the transmission plate 8. After the servo motor 7 is powered off, the positioning mechanism can automatically and timely fix the transmission plate 8 without manual adjustment. The degree of automation is high and the labor intensity of manual labor is reduced, and the use effect is good.

[0045] As an embodiment of the present invention, refer to Figure 3 The position adjustment assembly includes two screw rods 23 symmetrically rotatably installed between the two fixed plates 5. The two screw rods 23 are respectively penetrated by the two positioning plates 10, and the two positioning plates 10 are respectively threadedly engaged with the two screw rods 23. A stepper motor 24 is installed at one end of the two screw rods 23 close to the servo motor 7. Two guide rods 25 are installed between the two fixed plates 5 and are respectively penetrated by the two positioning plates 10. Scale lines 26 are evenly spaced on the two guide rods 25.

[0046] The screw rod 23 is threadably engaged with the positioning plate 10, so the system controls the stepper motor 24 and the screw rod 23 to drive the positioning plate 10 to move back and forth in the horizontal direction, so the positioning plate 10 can be conveniently moved and fixed, and the scale lines 26 on the guide rod 25 can be easily observed to observe that the positioning plate 10 has moved to a suitable position, so the positioning plate 10 can be conveniently moved to a specified position and fixed, and the operation is convenient and quick, thereby improving the convenience of using the position adjustment component and the CNC milling machine.

[0047] As an embodiment of the present invention, refer to Figure 1 , Figure 2 and Figure 3 The distance between the transmission plate 8 at the top and the transmission plate 8 at the bottom and the workbench 4 at the top is not less than 30 cm.

[0048] The distance between the transmission plate 8 at the top and the transmission plate 8 at the bottom and the workbench 4 at the top is relatively large, so it is easy to visually observe the scale line 26 on the guide rod 25 and the specific position of the positioning plate 10, further enhancing the convenience of position adjustment of the positioning plate 10, thereby further improving the convenience of using the position adjustment component and the CNC milling machine.

[0049] Working principle: The screw rod 23 is threadedly engaged with the positioning plate 10, so rotating the stepper motor 24 and the screw rod 23 can drive the positioning plate 10 to reciprocate in the horizontal direction, so the positioning plate 10 can be easily moved and fixed, and the positioning plate 10 can be easily moved to a suitable position by observing the scale line 26 on the guide rod 25, so the positioning plate 10 can be easily moved to a specified position and fixed; when using the longitudinal adjustment mechanism, the positioning plate 10 is first moved to a suitable position and fixed with the help of the position adjustment component, and the servo motor 7 can drive the threaded rod 6 to rotate periodically after being energized, and the threaded rod 6 and the transmission plate 8 are threadedly engaged with each other, so the periodic rotation of the threaded rod 6 can drive the transmission plate 8 and the lateral adjustment The joint mechanism moves back and forth longitudinally. When the transmission plate 8 contacts the positioning plate 10, the positive connection on the positioning plate 10 is connected to the negative connection on the transmission plate 8. At this time, the first electromagnet 12 is energized and the knife 11 is sucked tightly to one end of the first electromagnet 12. After the knife 11 moves to the end close to the first electromagnet 12, the closed circuit connected to the servo motor 7 is disconnected. At this time, the threaded rod 6 stops rotating and the transmission plate 8 and the lateral adjustment mechanism stop moving. When the servo motor 7 is energized, the third electromagnet 18 is energized and will attract the top rotating rod 19 and the second connecting end 21 to rotate downward. After the second connecting end 21 rotates downward, the second electromagnet 13 is de-energized and the positioning mechanism releases the fixation of the transmission plate 8, thereby facilitating the servo motor 7 to drive The movable threaded rod 6 drives the transmission plate 8 to move. After the servo motor 7 is powered off, the reset spring 22 will pull the rotating rod 19 and the second connecting end 21 to rotate upward and connect the second connecting end 21 to the bottom end of the first connecting end 20. At this time, the second electromagnet 13 is energized and the two clamping iron blocks 14 can be respectively sucked to the two ends of the second electromagnet 13. At this time, the first anti-skid pad 16 on the clamping iron block 14 will be tightly attached to the second anti-skid pad 17 on one side of the guide column 9, and after the second electromagnet 13 is energized, the two guide columns 9 will also be sucked at both ends of the second electromagnet 13, so that the first anti-skid pad 16, the clamping iron block 14, the second electromagnet 13 and the transmission plate 8 can be fixedly connected to the second anti-skid pad 17, the guide column 9, and the second electromagnet 13. The top transmission plate 8 and the workbench 4 can be laterally moved to a suitable position and fixed using the transverse adjustment mechanism. The longitudinal adjustment mechanism and the transverse adjustment mechanism cooperate with each other to conveniently move the top workbench 4 to the processing position and fix it. After the workbench 4 moves to the processing position, it is not only fixed by the locking force of the threaded engagement, but also a positioning mechanism is added to fix the workbench 4, thereby improving the stability of the workbench 4. Therefore, it can prevent the tool from causing the workpiece and the workbench 4 to shift in position when processing the workpiece on the workbench 4, thereby improving the processing accuracy of the CNC milling machine.

[0050] The electrical components appearing in this article are all connected to the external main controller and 220V AC power through a transformer, and the main controller can be a conventional known device that controls a computer, etc. The product model provided by the present invention is only used for the technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and consistent with the technical solution of the present invention. It is a technical solution for the best application of the technical solution. The model of its product can be replaced and modified according to the required technical parameters, which is well known to technical personnel in this field. Therefore, technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision CNC milling machine, comprising a base (1), a column (2), a milling head (3) and a workbench (4), characterized in that: A longitudinal adjustment mechanism and a transverse adjustment mechanism for driving the workbench (4) to move horizontally are installed on the top wall of the base (1), the longitudinal adjustment mechanism is fixedly installed on the top wall of the base (1), the transverse adjustment mechanism is slidably installed on the top of the longitudinal adjustment mechanism, and the workbench (4) is slidably installed on the top of the transverse adjustment mechanism, the longitudinal adjustment mechanism and the transverse adjustment mechanism each include two symmetrically arranged fixing plates (5), a threaded rod (6) is rotatably installed between the two fixing plates (5), a servo motor (7) for driving the threaded rod (6) to rotate is installed at one end of one of the fixing plates (5), a transmission plate (8) is threadedly connected to the threaded rod (6), and the two fixing plates (5) are symmetrically arranged. Two guide columns (9) penetrating the transmission plate (8) are symmetrically installed between the two fixed plates (5); two positioning plates (10) cooperating with the transmission plate (8) are symmetrically and movably installed between the two fixed plates (5); the two positioning plates (10) are respectively located on both sides of the transmission plate (8); when the transmission plate (8) contacts any positioning plate (10), the servo motor (7) is powered off; a positioning mechanism is installed in the transmission plate (8); a transmission component is provided between the servo motor (7) and the positioning mechanism; when the servo motor (7) is powered off, the positioning mechanism fixes the transmission plate (8); and a position adjustment component for driving the positioning plate (10) to move is provided between the two fixed plates (5); The positioning mechanism comprises a second electromagnet (13) installed in the transmission plate (8); the two guide columns (9) are both rectangular rods, and the second electromagnet (13) is located between the two guide columns (9); two clamping iron blocks (14) that cooperate with the guide columns (9) are symmetrically and elastically installed in the transmission plate (8), and the two clamping iron blocks (14) are respectively located on one side of the two guide columns (9); two movable grooves (15) that cooperate with the clamping iron blocks (14) are symmetrically provided in the transmission plate (8); the outer side walls of the two clamping iron blocks (14) on the side close to the guide columns (9) are both installed with a first anti-slip pad (16); and the outer side walls of the two guide columns (9) on the side close to the clamping iron blocks (14) are both installed with a second anti-slip pad (17) that cooperates with the first anti-slip pad (16); When the second electromagnet (13) is energized, the two clamping iron blocks (14) can be respectively sucked to the two ends of the second electromagnet (13). At this time, the first anti-skid pad (16) on the clamping iron block (14) will be tightly attached to the second anti-skid pad (17) on one side of the guide column (9). Moreover, when the second electromagnet (13) is energized, the two guide columns (9) will also be sucked to the two ends of the second electromagnet (13). Thus, the first anti-skid pad (16), the clamping iron block (14), the second electromagnet (13) and the transmission plate (8) can be fixedly connected to the second anti-skid pad (17), the guide column (9) and the fixed plate (5). Thus, the transmission plate (8) and the workbench (4) can be fixed, which can prevent the tool from causing the workpiece and the workbench (4) to shift in position when processing the workpiece on the workbench (4). The position adjustment assembly comprises two screw rods (23) symmetrically mounted between two fixed plates (5), the two screw rods (23) respectively passing through two positioning plates (10), and the two positioning plates (10) respectively threadedly engage with the two screw rods (23), a stepper motor (24) is mounted on one end of the two screw rods (23) close to the servo motor (7), two guide rods (25) respectively passing through the two positioning plates (10) are mounted between the two fixed plates (5), and scale marks (26) are evenly spaced on the two guide rods (25).

2. A high-precision CNC milling machine according to claim 1, characterized in that: The servo motor (7) is electrically connected to a knife switch (11), a first electromagnet (12) is installed on one side of the knife switch (11), a positive connection electrode electrically connected to the first electromagnet (12) is installed on one side of the two positioning plates (10) close to the transmission plate (8), and negative connection electrodes cooperating with the positive connection electrodes are installed on both sides of the transmission plate (8).

3. A high-precision CNC milling machine according to claim 1, characterized in that: The transmission assembly comprises a third electromagnet (18) electrically connected to the servo motor (7); a rotating rod (19) is rotatably mounted on the top end of the third electromagnet (18); a first connecting end (20) electrically connected to the second electromagnet (13) is provided on the top end of the rotating rod (19); a second connecting end (21) cooperating with the first connecting end (20) is mounted on one end of the rotating rod (19); and a return spring (22) is connected to one end of the rotating rod (19) away from the second connecting end (21).

4. A high-precision CNC milling machine according to claim 1, characterized in that: The distances between the transmission plate (8) at the top, the transmission plate (8) at the bottom, and the workbench (4) at the top are all no less than 30 cm.

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