Servo-controlled batch decorator

Abstract

The utility model provides a kind of servo numerical control batch flower machine, it is related to numerical control processing equipment technical field, the servo numerical control batch flower machine includes lathe bed, stand, X axis movement module, workbench, Z axis movement module and electric spindle.The rear of lathe bed is fixed with stand;X axis movement module is set on lathe bed, and X axis movement module includes first servo motor, X axis ball screw pair, a pair of X axis guide rail and X axis sliding table, and two X axis sliding blocks are mounted on each X axis guide rail;Workbench is fixedly connected with X axis sliding table;Z axis movement module is located in the front wall surface of stand, and Z axis movement module includes second servo motor, Z axis ball screw pair, a pair of Z axis guide rail and Z axis sliding table, and two Z axis sliding blocks are mounted on each Z axis guide rail;Electric spindle is vertically installed on Z axis sliding table, and electric spindle includes spindle motor and spindle core.By combining servo drive source and ball screw pair and double linear guide rail, the problem of poor processing finish caused by vibration is solved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining equipment technology, and in particular to a servo CNC pattern making machine. Background Technology

[0002] A CNC engraving machine is an automated device that uses a computer program to control the movement of cutting tools to perform high-gloss, high-precision engraving and texture processing on the surface of metal or non-metal workpieces (such as jewelry, signs, mobile phone casings, etc.). The processing quality, especially the surface finish and the fineness of the texture, is the core indicator for evaluating the performance of an engraving machine, and this is directly affected by the vibration level of the equipment during operation.

[0003] Stepper motors are commonly used in existing CNC crimping machines. They are widely used due to their open-loop control, simple structure, and low cost. However, the working principle of a stepper motor—receiving pulse signals and driving the rotor to rotate through a fixed step angle—is inherently flawed due to its discontinuous, step-by-step motion. This flaw leads to the following insurmountable technical problems:

[0004] 1. Stepper motors inherently exhibit low-frequency vibration. When the motor operates at low speed, its stepping torque output causes significant vibration and noise. This vibration is transmitted directly to the worktable and spindle through the transmission chain, such as the coupling and ball screw pair, and is ultimately reflected at the contact point between the tool and the workpiece, resulting in regular vibration marks on the machined surface, which seriously affects the aesthetics and finish of the product.

[0005] 2. Stepper motors have a resonance zone within a specific speed range. When the pulse frequency approaches the motor's natural frequency, severe resonance occurs, causing the motor to lose steps and vibrate drastically, making that speed range almost unusable for stable machining. Although microstepping technology can improve low-frequency vibration and smoothness to some extent, it cannot fundamentally eliminate the inherent flaws in the stepper motor's operating principle, and its vibration suppression capability remains very limited.

[0006] Existing technologies typically employ methods to resist vibration by increasing the weight and rigidity of the equipment's structural components. While this method has some effect, it merely improves the structure's vibration resistance and does not fundamentally dissipate the vibration energy generated by the stepper motor.

[0007] Therefore, it is necessary to improve the existing CNC crimping machine technology to overcome its shortcomings. Utility Model Content

[0008] To overcome the problems existing in related technologies, the purpose of this utility model is to provide a servo CNC crimping machine.

[0009] The 1PCN servo CNC crimping machine organically combines a smooth and continuous servo drive source with a high-rigidity, high-precision ball screw pair and dual linear guides to form a closed-loop precision motion control system. This system constructs a low-vibration precision motion platform from the source to the execution end, overcoming the problems of inherent low-frequency vibration, loss of steps in the resonance zone, and limited vibration suppression capabilities caused by the use of stepper motors in existing technologies, which in turn affect the surface finish of the machined parts.

[0010] A servo CNC crimping machine, comprising:

[0011] The bed frame has a column fixed to its rear, and the column extends upward from the bed frame.

[0012] An X-axis motion module is mounted on the bed. The X-axis motion module includes a first servo motor, an X-axis ball screw pair connected to the first servo motor, a pair of X-axis guide rails arranged in parallel along the horizontal direction, and an X-axis slide. Two X-axis sliders are mounted on each X-axis guide rail. The X-axis sliders slide in cooperation with the X-axis guide rails. The bottom of the X-axis slide is fixedly connected to the X-axis ball screw pair and the four X-axis sliders.

[0013] A worktable for fixing and supporting workpieces, wherein the worktable is fixedly connected to the X-axis slide table;

[0014] A Z-axis motion module is located on the front wall of the column. The Z-axis motion module includes a second servo motor, a Z-axis ball screw pair connected to the second servo motor, a pair of Z-axis guide rails arranged parallel to each other in the vertical direction, and a Z-axis slide. Two Z-axis sliders are installed on each Z-axis guide rail. The Z-axis sliders slide in cooperation with the Z-axis guide rails. The bottom of the Z-axis slide is fixedly connected to the Z-axis ball screw pair and the four Z-axis sliders.

[0015] An electric spindle is vertically mounted on the Z-axis slide. The electric spindle includes a spindle motor for outputting rotational power and a spindle core driven by the spindle motor and having a tool chuck at its front end.

[0016] Furthermore, the worktable is a vacuum adsorption stage, which includes:

[0017] An adsorption panel, the upper surface of which forms the workpiece bearing surface of the worktable, and the adsorption panel having a plurality of adsorption through holes arranged in an array and penetrating its thickness.

[0018] A base is fixed on the X-axis slide, and the adsorption panel is sealed on the upper surface of the base. A vacuum cavity is formed between the base and the adsorption panel, and the lower ends of the plurality of adsorption through holes are all connected to the vacuum cavity.

[0019] An air extraction port is provided on the base and communicates with the vacuum chamber. The air extraction port is used to connect to an external vacuum generator to evacuate the vacuum chamber to a negative pressure state, thereby generating an adsorption force on the workpiece placed on the adsorption panel through the adsorption through hole.

[0020] Traditional mechanical clamps (such as clamping plates and vises) apply clamping force through point or line contact, resulting in uneven force distribution. Therefore, when clamping thin or fragile workpieces, this can easily lead to warping, deformation, or even damage. Furthermore, the clamp itself occupies the machining surface, creating "interference zones" or "dead zones," preventing the cutting tool from machining the entire workpiece area. The vacuum adsorption stage, however, generates a uniform negative pressure adsorption force on the entire bottom surface of the workpiece through a vacuum chamber within the base and numerous through holes on the adsorption panel. This ensures that the clamping force is evenly distributed across the entire support surface of the workpiece, effectively avoiding localized stress concentration and firmly and smoothly fixing thin sheet workpieces without deformation. Since there are no mechanical clamps obstructing the workpiece's upper surface, the cutting tool's machining range can cover the entire workpiece surface, achieving machining without dead zones. Moreover, changing workpieces only requires turning the vacuum on and off, making the operation far more efficient than tightening / loosening multiple bolts.

[0021] Furthermore, the Z-axis slide is provided with an integrated high-damping structure, which includes at least one sealed inner cavity within the Z-axis slide and a composite damping body that is completely filled and solidified in the sealed inner cavity.

[0022] The Z-axis slide is the terminal moving part that directly supports the electric spindle. Being closest to the cutting point, it is the end of the machine's vibration transmission chain and is most sensitive to high-frequency vibrations generated by spindle rotation and tool cutting. While traditional solid metal slides have high rigidity, their inherent damping is extremely low, preventing effective dissipation of vibration energy, which persists and affects tool tip stability. In contrast, the slide incorporates an internal cavity filled with a composite damping body. When the slide body undergoes slight deformation due to vibration, this deformation is transmitted to the internal composite damping body. During this process, the internal molecular chains of the composite damping body generate intense mutual friction and movement, efficiently converting the mechanical energy causing vibration into heat energy and dissipating it.

[0023] Furthermore, the column is provided with a constraint layer composite damping structure, which is stacked and laid on the outer wall surface of the column.

[0024] Furthermore, the constraint layer composite damping structure comprises, from the inside out, the following:

[0025] A viscoelastic damping layer bonded to the outer wall of the column, and a high-stiffness constraint layer covering the outer surface of the viscoelastic damping layer.

[0026] The column is a large structural component supporting the entire Z-axis motion module. Its large wall area makes it prone to low-frequency bending vibrations or thumping during machine operation. This overall vibration can compromise the machine tool's geometric accuracy, leading to deviations in machined shapes (such as straight lines and arcs). A sandwich-structured constraint layer composite damping is applied to the outer wall of the column. When the column wall panel (base layer) undergoes bending vibration, its outer surface experiences tension or compression. Due to the high-stiffness constraint layer on the outer side resisting deformation, this tensile / compressive force forces the middle viscoelastic damping layer to undergo shear deformation. Under shear deformation, the viscoelastic material can convert the energy of the column's bending vibration into heat energy.

[0027] Furthermore, the composite damping body is formed by mixing and curing an epoxy resin matrix with mineral aggregates consisting of quartz sand or granite particles.

[0028] Furthermore, the sealed inner cavity comprises multiple independent chambers arranged in a honeycomb array.

[0029] Using only pure epoxy resin as the damping body limits its stiffness and mass. Designing a single, large cavity would severely weaken the static stiffness of the Z-axis slide, making it prone to deformation under cutting forces. The adopted "epoxy resin + quartz sand" composite, with the addition of quartz sand aggregate, significantly increases the mass and stiffness of the damping body. It creates numerous new frictional energy dissipation interfaces between the resin and sand particles, resulting in overall damping performance far exceeding that of pure resin. The honeycomb-shaped independent chamber structure, with the wall panels between chambers acting as internal reinforcing ribs, allows for the introduction of a large amount of damping material while maximizing the preservation of the slide's original static stiffness, preventing structural weakening.

[0030] Furthermore, the high-stiffness constraint layer is made of a thin metal sheet or a carbon fiber reinforced composite material plate.

[0031] The efficiency of a confined layer composite damping structure directly depends on the confined layer's ability to resist deformation. If the confined layer itself lacks sufficient stiffness, it will deform along with the matrix layer, failing to generate effective shear force on the intermediate damping layer. The selected thin metal plates (such as steel plates) or carbon fiber plates have high stiffness, forcing the viscoelastic layer to undergo sufficient shear deformation when the matrix layer vibrates, thus ensuring that the entire damping structure operates at its most efficient state.

[0032] Furthermore, the first servo motor and the X-axis ball screw pair, as well as the second servo motor and the Z-axis ball screw pair, are all connected by flexible couplings.

[0033] In actual assembly, the output shaft of the servo motor and the input end of the ball screw cannot achieve perfect coaxial alignment; slight radial, angular, or axial misalignment is inevitable. If a rigid coupling is used, these slight misalignments will force unnatural bending of the motor shaft and screw shaft, applying significant additional radial force to the bearings on both sides. This leads to accelerated bearing wear, increased operating noise, and even transmission jamming. Using a flexible coupling, the elastic element can compensate for these misalignments, protecting the bearings and ensuring smooth transmission.

[0034] Furthermore, the flexible coupling is a diaphragm coupling, which includes two hubs respectively connected to the output shaft of the servo motor and the input end of the ball screw pair, and multiple sets of metal diaphragms fixed between the two hubs by bolts.

[0035] Diaphragm couplings compensate for misalignment through the elastic deformation of a metal diaphragm, exhibiting extremely high torsional stiffness and zero backlash in the direction of torque transmission. Therefore, they can transmit every minute, precise rotational command from the servo motor to the ball screw without delay or distortion.

[0036] The beneficial effects of this utility model are as follows:

[0037] This utility model provides a servo CNC decal machine, which includes a bed, column, X-axis motion module, worktable, Z-axis motion module, and electric spindle. The servo motor serves as the drive source, and its closed-loop control characteristics provide smooth, continuous, and low-frequency pulsation-free rotational power. Both the X and Z axes employ a dual-guide-rail, four-slider layout. The two parallel guide rails, along with the four rectangularly distributed sliders, form a wide support base. This support base effectively resists and absorbs the overturning torque and lateral forces generated by the electric spindle during high-speed movement and cutting. This ensures that even under severe dynamic machining conditions, the X-axis and Z-axis slides maintain extremely high posture stability and motion rigidity. Through deep synergy between servo drive, precision transmission, and high-rigidity guidance, a complete technical closed loop is constructed, possessing high precision, high rigidity, and high dynamic response from the power source to the end of motion. It systematically solves the problems of vibration and precision loss caused by insufficient performance of the drive, transmission and support components of traditional embossing machines, thereby improving the smoothness, fineness and contour accuracy of the processed surface. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the servo CNC crimping machine provided in this application;

[0039] Figure 2 This is a schematic diagram of the Z-axis motion module provided in this application;

[0040] Figure 3This is a schematic diagram of the X-axis motion module provided in this application;

[0041] Figure 4 This is a schematic diagram of the workbench provided in this application;

[0042] Figure 5 This is a cross-sectional schematic diagram of the Z-axis slide provided in this application at the sealed inner cavity;

[0043] Figure 6 This is a schematic diagram of the constraint layer composite damping structure provided in this application.

[0044] Figure label:

[0045] 100. Bed frame;

[0046] 200, Column; 210, Viscoelastic Damping Layer; 220, High-Stiffness Constraint Layer;

[0047] 300, X-axis motion module; 310, first servo motor; 320, X-axis ball screw pair; 330, X-axis guide rail; 331, X-axis slider; 340, X-axis slide table;

[0048] 400. Workbench; 410. Adsorption panel; 411. Adsorption through hole; 420. Base; 430. Air extraction port;

[0049] 500, Z-axis motion module; 510, second servo motor; 520, Z-axis ball screw pair; 530, Z-axis guide rail; 531, Z-axis slider; 540, Z-axis slide table; 541, sealed inner cavity;

[0050] 600. Electric spindle; 610. Spindle motor; 620. Spindle core; 621. Tool chuck. Detailed Implementation

[0051] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0052] Example

[0053] like Figures 1 to 6 As shown, this embodiment provides a servo CNC decal machine, which includes:

[0054] The bed 100 provides a stable mounting base for the entire machine and is preferably a one-piece cast iron structure to provide excellent rigidity and foundation vibration reduction performance. A column 200 is fixed to the rear of the bed 100, extending upwards from it. Both the bed 100 and the column 200 are made of cast aluminum or cast iron. The column 200 is generally L-shaped, and it has a guide rail mounting surface for mounting the linear guide slider and a spindle mounting seat for fixing the spindle motor 610.

[0055] The X-axis motion module 300 is disposed on the upper surface of the bed 100. The X-axis motion module 300 includes a first servo motor 310, an X-axis ball screw pair 320 connected to the first servo motor 310, a pair of X-axis guide rails 330, and an X-axis slide 340. X-axis sliders 331 are slidably fitted on the X-axis guide rails 330. Two X-axis sliders 331 are mounted on each X-axis guide rail 330, for a total of four. This wide-base four-slider layout effectively resists overturning torques during machining, ensuring smooth movement. The bottom of the X-axis slide 340 is fixedly connected to the nut seat of the X-axis ball screw pair 320 and the four X-axis sliders 331.

[0056] A worktable 400 for fixing and supporting workpieces is fixed on an X-axis slide 340. In one specific embodiment, the worktable 400 is a vacuum adsorption stage. The vacuum adsorption stage includes an adsorption panel 410, a base 420 forming a vacuum cavity, and an air extraction port 430. This design can provide uniform and damage-free clamping force for workpieces, especially thin-walled or fragile workpieces, and achieve interference-free full-surface machining.

[0057] The Z-axis motion module 500 is located on the front wall of the column 200. Its structure is similar to that of the X-axis motion module 300, including a second servo motor 510, a Z-axis ball screw pair 520, a pair of Z-axis guide rails 530 and a Z-axis slide 540.

[0058] The electric spindle 600 is vertically mounted on a vibration-damping Z-axis slide 540. The electric spindle 600 includes a built-in spindle motor 610 and a spindle core 620 for holding the stencil cutter.

[0059] To ensure that the high-precision motion of the servo motor can be transmitted to the ball screw without loss or delay, thereby fully leveraging the closed-loop advantages of the servo system, this embodiment also incorporates a precise collaborative design in the transmission connections. The first servo motor 310 and the X-axis ball screw pair 320, as well as the second servo motor 510 and the Z-axis ball screw pair 520, are all connected via flexible couplings. More preferably, the flexible coupling is a diaphragm coupling. The diaphragm coupling is chosen because of its zero backlash, high torsional stiffness, and high dynamic response characteristics. For servo systems with extremely high requirements for response speed and positioning accuracy, this is a crucial link in ensuring final machining accuracy and preventing the introduction of new errors into the transmission chain.

[0060] In a preferred embodiment, the Z-axis slide 540 incorporates an integrated high-damping structure. As the end-effector closest to the tool, the Z-axis slide 540 is crucial for suppressing high-frequency cutting vibrations. This embedded vibration reduction solution is a more sophisticated and efficient technique compared to traditional external dampers or crude designs that simply increase weight. The structure includes at least one pre-set sealed cavity 541 within the Z-axis slide 540 body, and a composite damping body completely filled and solidified within the sealed cavity 541.

[0061] Inside the slide body, particularly in non-primary load-bearing areas (i.e., areas avoiding the connecting bolt holes with the guide rails, lead screw nuts, and spindle, as well as the main reinforcing ribs), one or more isolated, honeycomb-shaped, sealed chambers are provided, either through pre-casting or secondary machining. These chambers collectively constitute the damping cavity. On the outer wall of the slide body, an inlet and an outlet are provided for the damping cavity. The inlet is located at the lower part of the cavity, and the outlet is located at the highest part. Both ports are threaded holes, and after filling, they are sealed by tightening sealing screws coated with sealant.

[0062] To ensure vibration reduction without significantly weakening the static stiffness of the slide, the sealed inner cavity 541 is preferably composed of multiple independent chambers arranged in a honeycomb array. This structure achieves a balance between stiffness and lightweight in mechanics, minimizing the impact on the static stiffness of the slide itself while introducing a large number of damping elements, successfully resolving the technical contradiction between vibration reduction performance and load-bearing stiffness. The composite damping element is preferably formed by mixing and curing an epoxy resin matrix with quartz sand or granite particles as mineral aggregate. A composite material is prepared by mixing epoxy resin and quartz sand particles with a particle size of 0.1-0.5 mm at a mass ratio of 1:2.

[0063] In another preferred embodiment, to further suppress low-frequency structural vibrations transmitted from the overall machine motion to the column 200, a constraint layer composite damping structure is provided on the column 200. This solution actively eliminates vibrations through efficient energy dissipation, rather than passively resisting vibrations by simply increasing structural weight as in traditional methods, thus achieving structural lightweighting while ensuring overall machine stability. The constraint layer composite damping structure is layered on the outer wall of the column 200, and from the inside out includes a viscoelastic damping layer 210 and a high-stiffness constraint layer 220. When the column 200 vibrates, the constraint effect of the high-stiffness constraint layer 220 forces the intermediate viscoelastic damping layer 210 to undergo severe shear deformation, thereby efficiently dissipating vibration energy. To achieve the best constraint effect, the high-stiffness constraint layer 220 is preferably made of thin metal sheet or carbon fiber reinforced composite material plate. In this embodiment, the viscoelastic damping layer 210 is a 0.5mm thick sheet of 3MISD112 type damping polymer material. This sheet has its own pressure-sensitive adhesive and is firmly adhered to the vibration-damping application surface of the column 200 body after the protective film is peeled off. During adhesion, a rubber roller is used to roll firmly from the center outwards to remove all air bubbles. The high-stiffness constraint layer 220 is a 1.5mm thick stainless steel sheet with the same shape as the viscoelastic damping layer 210. After cleaning the bonding surface of the stainless steel sheet, a special structural adhesive is applied, and then it is precisely covered and adhered to the viscoelastic damping layer 210. A certain pressure is applied and maintained for 24 hours to allow the structural adhesive to fully cure.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. Any specific values ​​in all examples shown and discussed herein should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" is merely for ease of distinction, and unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A servo CNC crimping machine, characterized in that, include: A bed frame (100) is provided, and a column (200) is fixed to the rear of the bed frame (100), the column (200) extending upward from the bed frame (100); An X-axis motion module (300) is mounted on the bed (100). The X-axis motion module (300) includes a first servo motor (310), an X-axis ball screw pair (320) that is connected to the first servo motor (310), a pair of X-axis guide rails (330) arranged in parallel along the horizontal direction, and an X-axis slide (340). Each X-axis guide rail (330) is equipped with two X-axis sliders (331). The X-axis sliders (331) are slidably engaged with the X-axis guide rails (330). The bottom of the X-axis slide (340) is fixedly connected to the X-axis ball screw pair (320) and the four X-axis sliders (331). A worktable (400) for fixing and supporting workpieces, the worktable (400) being fixedly connected to the X-axis slide (340); A Z-axis motion module (500) is disposed on the front wall of the column (200). The Z-axis motion module (500) includes a second servo motor (510), a Z-axis ball screw pair (520) connected to the second servo motor (510), a pair of Z-axis guide rails (530) arranged parallel in the vertical direction, and a Z-axis slide (540). Two Z-axis sliders (531) are installed on each Z-axis guide rail (530). The Z-axis sliders (531) are slidably engaged with the Z-axis guide rails (530). The bottom of the Z-axis slide (540) is connected to the Z-axis ball screw pair (520). An electric spindle (600) is vertically mounted on the Z-axis slide (540). The electric spindle (600) includes a spindle motor (610) for outputting rotational power and a spindle core (620) driven by the spindle motor (610) and having a tool chuck (621) at its front end.

2. The servo CNC crimping machine according to claim 1, characterized in that: The worktable (400) is a vacuum adsorption stage, which includes: Adsorption panel (410), the upper surface of which forms the workpiece bearing surface of the worktable (400), and the adsorption panel (410) is provided with a plurality of adsorption through holes (411) arranged in an array and penetrating its thickness. The base (420) is fixed on the X-axis slide (340), and the adsorption panel (410) is sealed on the upper surface of the base (420). A vacuum cavity is formed between the base (420) and the adsorption panel (410), and the lower ends of the plurality of adsorption through holes (411) are all connected to the vacuum cavity. An air extraction port (430) is provided on the base (420) and communicates with the vacuum chamber. The air extraction port (430) is used to connect to an external vacuum generator to draw the vacuum chamber into a negative pressure state, thereby generating an adsorption force on the workpiece placed on the adsorption panel (410) through the adsorption through hole (411).

3. The servo CNC crimping machine according to claim 1, characterized in that: The Z-axis slide (540) is provided with an integrated high-damping structure, which includes at least one sealed inner cavity (541) in the Z-axis slide (540) and a composite damping body that is completely filled and solidified in the sealed inner cavity (541).

4. The servo CNC crimping machine according to claim 1, characterized in that: The column (200) is provided with a constraint layer composite damping structure, which is stacked and laid on the outer wall surface of the column (200).

5. The servo CNC crimping machine according to claim 4, characterized in that: The constraint layer composite damping structure comprises, from the inside out: A viscoelastic damping layer (210) bonded to the outer wall of the column (200), and a high-stiffness constraint layer (220) covering the outer surface of the viscoelastic damping layer (210).

6. The servo CNC crimping machine according to claim 3, characterized in that: The sealed inner cavity (541) consists of multiple independent chambers arranged in a honeycomb array.

7. The servo CNC crimping machine according to claim 5, characterized in that: The high-rigidity constraint layer (220) is made of a thin metal sheet or a carbon fiber reinforced composite material plate.

8. The servo CNC crimping machine according to claim 1, characterized in that: The first servo motor (310) and the X-axis ball screw pair (320), as well as the second servo motor (510) and the Z-axis ball screw pair (520), are all connected by flexible couplings.

9. The servo CNC crimping machine according to claim 8, characterized in that: The flexible coupling is a diaphragm coupling, which includes two hubs that are respectively connected to the output shaft of the servo motor and the input end of the ball screw pair, and multiple sets of metal diaphragms that are fixed between the two hubs by bolts.

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