Multifunctional precise micro-milling device for hardness detection

Abstract

The invention relates to a multifunctional precise micro-milling device for hardness detection, which comprises a movable slide carriage, a U-shaped mounting plate and a milling head mounting plate, the U-shaped mounting plate and the milling head mounting plate are mounted on the movable slide carriage, a displacement sensor and a matched lifting unit are mounted on the U-shaped mounting plate, and a milling assembly is mounted on the milling head mounting plate. According to the invention, a mechanical device is utilized to make flexible contact with a test surface, the actual position of the test surface is reflected in real time through a displacement sensor, a servo motor acceleration and deceleration machine is adopted for driving, the height of the test surface is measured, and the height of the test surface is measured. The high-speed milling head is guided and driven by the heightened rigid wide linear guide rail to reach a reasonable height, a high-quality test surface is efficiently and accurately milled, a basically closed milling environment is formed in the lifting cutter sleeve, milling chips are collected through the high-power dust collector, and the cutter can be easily separated from the external lifting cutter sleeve through a rotatable push-pull structure. And the cutting blade is convenient to replace and maintain.

Description

Technical Field

[0001] This application relates to the technical field of online hardness testing devices, and more specifically, to a multifunctional precision micro-milling device for hardness testing. Background Technology

[0002] In metal hardness testing, most test parts undergo surface removal after heat treatment. However, for the widely used Brinell hardness test, a test plane needs to be milled to create the surface of the test part. The experimental method requires high-quality milling of the milled plane to meet hardness testing requirements. Furthermore, the removal depth is generally controlled within a small range of 0.5–2 mm, and sometimes even as low as 0.1–0.2 mm, considering subsequent machining requirements and material utilization. This is because: 1) Some industries have strict requirements for part shape and strength, and therefore do not perform finishing after heat treatment, only needing to meet hardness testing requirements. To ensure part integrity and overall strength, the removal amount must be strictly controlled; examples include high-pressure gas cylinders, drill collars, some military parts, and some automotive parts. 2) Some parts undergo hardness testing after rough machining and heat treatment, followed by finishing. Due to finishing allowance limitations, the removal amount must be as small as possible; examples include drive shaft parts, engine blocks, cylinder heads, cartridge cases, and some military parts. Currently, the commonly used methods for controlling milling depth are mechanical positioning and laser ranging. Mechanical positioning is difficult to control with high precision due to mechanical positioning errors and irregularities in the workpiece's shape, and it is also costly and has a complex testing procedure. Laser ranging, on the other hand, suffers from variations in the reflectivity of different materials, which affects the laser sensor's measurement. Furthermore, oxide scale and warping abrupt changes on the surface of parts after heat treatment cause measurement distortion, making it difficult to accurately measure the actual height of the workpiece's surface. This makes controlling the milling depth difficult and can even lead to workpiece scrap. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a multifunctional precision micro-milling device for hardness testing. This milling device integrates a milling head and its guiding components and a vertical movement drive component, and is equipped with a chip collection lifting tool sleeve component and its rotation and push-pull components. At the same time, the lifting tool sleeve integrates a height measuring component. When the moving slide moves up and down, it causes the lifting tool sleeve to press against the workpiece surface. The height measuring base plate of the lifting shaft reflects the actual height to the displacement sensor. By comparing it with the original state, the actual height of the workpiece surface is calculated. After the milling head moves up and down to the required height according to the required milling depth, the milling is completed by the lateral movement of the moving slide. At the same time, an external industrial vacuum cleaner sucks away the milled chips through the internal cavity of the lifting tool sleeve. When the lifting tool sleeve is pushed to disengage from the hook, pulling and rotating the lifting tool sleeve can disengage the tool sleeve from the milling cutter, realizing tool replacement and maintenance.

[0004] The objective of this application is achieved through the following technical solution: A multifunctional precision micro-milling device for hardness testing includes a movable slide, a U-shaped mounting plate and a milling head mounting plate mounted on the movable slide. The U-shaped mounting plate is equipped with a displacement sensor and a corresponding lifting unit. The milling head mounting plate is equipped with a milling assembly. The corresponding lifting unit includes a spring assembly, a lifting shaft, a height measuring base plate, and a lifting tool sleeve. A rotatable lifting tool sleeve is mounted at the bottom of the lifting shaft, and the lifting tool sleeve is used to contact the workpiece to be tested. The spring assembly controls the vertical movement distance of the lifting shaft. The height measuring base plate is located at the center of the lifting shaft, with one end of the height measuring base plate located at the bottom of the displacement sensor. The height measuring base plate slides up and down with the lifting shaft. The milling assembly includes a milling head and a drive unit, and the drive unit controls the vertical movement of the milling head.

[0005] As a further improvement of this application, the U-shaped mounting plate is fixed to one side of the movable slide. A displacement sensor mounting seat is provided on the side of the U-shaped mounting plate away from the milling assembly. The displacement sensor is fixed on the displacement sensor mounting seat. A slotted guide block is fixed at the upper end of the inner cavity of the U-shaped mounting plate. The slotted guide block has long slots on both sides. The upper and lower ends of the U-shaped mounting plate have through holes. The slotted guide block has a vertical slot in the center. The through holes, the vertical slot, and the lifting shaft are coaxially arranged. The lifting shaft passes through the through holes at the upper and lower ends of the U-shaped mounting plate and the vertical slot in the middle of the slotted guide block.

[0006] As a further improvement of this application, a guide pin is fitted in the middle of the lifting shaft. The guide pin slides up and down in the long slot on the side of the slotted guide block, and one end of the guide pin is provided with a cotter pin.

[0007] As a further improvement of this application, the lower end of the U-shaped mounting plate is fixed with a hanging shaft seat, and the front end of the hanging shaft seat is provided with a hanging shaft.

[0008] As a further improvement of this application, a hook base and a hook are provided on one side of the lifting tool sleeve. The hook and the hook base are connected by a pin. The hook can swing back and forth in the inner cavity of the hook base along the pin. The hook cooperates with the hanging shaft. The rear end of the lifting tool sleeve is connected to a dust suction pipe connector by a thread. The dust suction pipe connector is connected to a high-power vacuum cleaner through a pipe. The lifting tool sleeve communicates with the dust suction pipe structure in the inner cavity of the milling head. Milling chips are sucked away by the vacuum cleaner through the inner cavity.

[0009] As a further improvement of this application, the spring assembly includes an upper spring, a lower spring, a spring seat, and a round nut. The upper spring is sleeved on the upper end of the lifting shaft. The inner hole of the spring seat is clearance-fitted with the lifting shaft. The lower end face of the spring seat is in contact with the upper end face of the upper spring to limit the radial displacement of the spring and transmit the preload. The round nut is screwed into the external thread at the upper end of the lifting shaft. The lower end face of the round nut presses against the spring seat, axially locking the spring seat and the upper spring on the lifting shaft to achieve adjustment of the spring preload. The lower spring is located between the U-shaped mounting plate and the lifting blade sleeve.

[0010] As a further improvement of this application, the movable slide has a rectangular slot in the middle, a wide linear guide rail and a linear guide rail slider are installed in the rectangular slot, the linear guide rail slider moves up and down along the wide linear guide rail, and the milling head mounting plate is fixed on the linear guide rail slider.

[0011] As a further improvement of this application, a milling head is fixed below the milling head mounting plate, and the lower end of the milling head is an NT tool holder and a milling cutter.

[0012] As a further improvement of this application, a reducer base is installed at the upper end of the rectangular slot of the movable slide, and a drive unit is fixed on the reducer base. The drive unit includes a servo motor and a right-angle reducer. The front flange of the servo motor is fixedly connected to the input flange of the right-angle reducer by bolts. The front end of the right-angle reducer is connected to a ball screw, a screw nut seat, and a ball screw nut. The screw nut seat is connected to the ball screw through the ball screw nut. The screw nut seat and the milling head are fixed on the milling head mounting plate. The servo motor, the right-angle reducer, and the ball screw drive the movable slide to move up and down linearly along the wide linear guide rail.

[0013] As a further improvement of this application, a first slide rail and a hydraulic cylinder are provided above the movable slide plate. A sliding block is provided on the first slide rail. The hydraulic cylinder is fixed on the sliding block. The output shaft of the hydraulic cylinder is fixedly connected to the movable slide plate. The hydraulic cylinder moves laterally along the first slide rail. A motor is provided on one side of the sliding block. The output shaft of the motor is fixedly connected to the sliding block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The multi-functional precision micro-milling device for hardness testing is a multi-functional device for precisely controlling the machining (milling) depth of test pieces. It has three main functions: determining the original height, efficient and precise depth milling, and collecting iron chips. 1. It uses a mechanical device to flexibly contact the test surface, and a displacement sensor reflects the actual position of the test surface in real time. 2. It adopts a servo motor and reducer drive, with a high-rigidity wide linear guide rail for guidance, driving the high-speed milling head to a reasonable height, efficiently and precisely milling a high-quality test surface. 3. The lifting tool holder creates a basically closed milling environment, and a high-powered dust collector collects milling chips. The rotatable push-pull structure makes it easy to detach the tool from the external lifting tool holder, facilitating the replacement of cutting inserts and maintenance.

[0015] Compared with existing milling equipment: 1. The present invention has a compact structure and superimposed functions, realizing highly contact measurement, rigid milling, chip collection, tool holder rotation and push-pull actions in a small space.

[0016] 2. The height of the milling point is measured by contact, which reduces the influence of irregularities and microscopic factors and accurately detects the actual height of the surface to be milled.

[0017] 3. The milling device adopts an embedded structure and is guided by a high-rigidity, wide-width linear guide rail, which reduces the overhang of the milling head, provides sufficient structural rigidity, and results in high-quality milled surfaces.

[0018] 4. The measuring device and the chip collection device are integrated into one, so that the starting point of the tool is the height test position, making the test position as close as possible to the milling position, eliminating the unnecessary movement of the slide test displacement, and improving efficiency and test accuracy.

[0019] 5. The measuring component adopts a composite structure of rotation and push-pull, with an added long slot guide to realize push-pull and rotation actions. It is easy to operate and can be easily disengaged from the milling cutter, freeing up space for milling cutter maintenance.

[0020] 6. The hook-type structure ensures that the original measurement reference remains constant and is easy to detach. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the multifunctional precision micro-milling device for hardness testing provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the movable slide provided in an embodiment of this application; Figure 3 To match the structural diagram of the lifting unit; Figure 4 To match the sectional view of the lifting unit; Figure 5 This is a schematic diagram of the overall structure of the milling assembly; Figure 6 This is a schematic diagram showing the lifting tool sleeve rotated 90 degrees and disengaged from the lifting tool. Figure 7 This is an enlarged schematic diagram showing the lifting tool sleeve rotated 90 degrees and disengaged from the lifting tool.

[0022] Icons: 1. Moving slide; 2. Height measuring base plate; 3. Displacement sensor mounting base; 4. Displacement sensor; 5. U-shaped mounting plate; 6. Milling head; 7. Milling head mounting plate; 8. Reducer base; 9. Right angle reducer; 10. Servo motor; 11. Ball screw; 12. Screw nut seat; 13. Ball screw nut; 14. NT tool holder; 15. Lifting tool sleeve; 16. Wide linear guide; 17. Linear guide slider; 18. Hook base; 19. Pin; 20. Dust suction pipe connector; 21. Lower spring; 22. Hanging shaft; 23. Hanging shaft seat; 24. Upper spring; 25. Spring seat; 26. Round nut; 27. Slotted guide block; 28. Guide pin; 29. ​​Lifting shaft; 30. Hook; 31. Milling cutter; 32. Workpiece to be tested; 33. Cotter pin. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0024] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0025] The multifunctional precision micro-milling device for hardness testing proposed in this application includes a movable slide 1, a U-shaped mounting plate 5 and a milling head mounting plate 7 mounted on the movable slide 1. The U-shaped mounting plate 5 is equipped with a displacement sensor 4 and a cooperating lifting unit. The milling head mounting plate 7 is equipped with a milling assembly. The cooperating lifting unit includes a spring assembly, a lifting shaft 29, a height measuring base plate 2, and a lifting tool sleeve 15. A rotatable lifting tool sleeve 15 is mounted on the bottom of the lifting shaft 29. The lifting tool sleeve 15 is used to contact the workpiece 32 to be tested. The spring assembly is used to control the vertical movement distance of the lifting shaft 29. The height measuring base plate 2 is located at the center of the lifting shaft 29. One end of the height measuring base plate 2 is located at the bottom of the displacement sensor 4. The height measuring base plate 2 slides up and down with the lifting shaft 29. The milling assembly includes a milling head 6 and a drive unit. The drive unit is used to control the vertical movement of the milling head 6.

[0026] The U-shaped mounting plate 5 is fixed to one side of the movable slide plate 1. A displacement sensor mounting base 3 is provided on the side of the U-shaped mounting plate 5 away from the milling assembly. The displacement sensor 4 is fixed on the displacement sensor mounting base 3. The displacement sensor 4 is used to monitor the height of the height measurement substrate 2. A slotted guide block 27 is fixed at the upper end of the inner cavity of the U-shaped mounting plate 5. The slotted guide block 27 has long slots on both sides. The upper and lower ends of the U-shaped mounting plate 5 have through holes. The center of the slotted guide block 27 has a vertical slot. The through holes, the vertical slot, and the lifting shaft 29 are coaxially arranged. The lifting shaft 29 passes through the through holes at the upper and lower ends of the U-shaped mounting plate 5 and the vertical slot in the middle of the slotted guide block 27.

[0027] Specifically, the lifting shaft 29 is fitted with a guide pin 28 in the middle. The guide pin 28 can slide up and down in the long slot on the side of the slotted guide block 27. One end of the guide pin 28 is provided with a cotter pin 33. The guide pin 28 is used to cooperate with the long slot. The guide pin 28 can be detached from the bottom of the long slot and retracted. The cotter pin 33 is used to fix the guide pin 28 in the long slot, ensuring a close fit between the two. The other end of the guide pin 28 is provided with a nut. The cooperation between the nut and the cotter pin 33 further helps to fix the lifting shaft 29.

[0028] The lower end of the U-shaped mounting plate 5 is fixed with a hanging shaft seat 23, and the front end of the hanging shaft seat 23 is provided with a hanging shaft 22. Correspondingly, one side of the lifting blade sleeve 15 is provided with a hook base 18 and a hook 30. The hook 30 and the hook base 18 are connected by a pin 19. The hook 30 can swing back and forth along the pin 19 within the inner cavity of the hook base 18. The hook 30 cooperates with the hanging shaft 22. Specifically, both the hook 30 and the front cavity of the hanging shaft seat 23 have a square structure. To improve the tightness of the connection between the hook 30 and the front cavity of the hanger seat 23, and to prevent the lifting tool sleeve 15 from shifting, after the hook 30 is fixed to the hanger 22, the hook 30 and the front cavity of the hanger seat 23 fit together. The rear end of the lifting tool sleeve 15 is connected to a dust suction pipe connector 20 through a thread. The dust suction pipe connector 20 is connected to a high-powered vacuum cleaner through a pipe. The lifting tool sleeve 15 is connected to the dust suction pipe structure in the inner cavity of the milling head 6. The milling chips are sucked away by the vacuum cleaner through the inner cavity.

[0029] Specifically, the spring assembly includes an upper spring 24, a lower spring 21, a spring seat 25, and a round nut 26. The upper spring 24 is sleeved on the upper end of the lifting shaft 29. The inner hole of the spring seat 25 is clearance-fitted with the lifting shaft 29, and the lower end face is in contact with the upper end face of the upper spring 24 to limit the radial displacement of the spring and transmit the preload. The round nut 26 is screwed into the external thread at the upper end of the lifting shaft 29 and presses against the spring seat 25 through the lower end face, thus axially locking the spring seat 25 and the upper spring 24 onto the lifting shaft 29 to achieve the adjustment of the spring preload. The lower spring 21 is located between the U-shaped mounting plate 5 and the lifting blade sleeve 15. The upper and lower ends of the lower spring 21 are rotatably engaged with both. The function of the upper spring 24 is to provide an upward balancing force to the lifting shaft 29 and the lifting blade sleeve 15, and the function of the lower spring 21 is to provide a downward pushing force to the lifting shaft 29 and the lifting blade sleeve 15. The lower spring 21 also has the function of protecting the displacement sensor 4 to prevent the height measuring base plate 2 from moving excessively upward and damaging the displacement sensor 4.

[0030] The movable slide 1 has a rectangular slot in the middle, and a wide linear guide rail 16 and a linear guide rail slider 17 are installed in the rectangular slot. The linear guide rail slider 17 moves up and down along the wide linear guide rail 16. The milling head mounting plate 7 is fixed on the linear guide rail slider 17. A milling head 6 is fixed below the milling head mounting plate 7. The lower end of the milling head 6 is the NT tool holder 14 and the milling cutter 31. The milling head 6 moves up and down on the wide linear guide rail 16.

[0031] Specifically, a reducer base 8 is installed at the upper end of the rectangular slot of the movable slide 1. A drive unit is fixed on the reducer base 8. The drive unit includes a servo motor 10 and a right-angle reducer 9. The front flange of the servo motor 10 is fixedly connected to the input flange of the right-angle reducer 9 by bolts. The front end of the right-angle reducer 9 is connected to a ball screw 11, a screw nut seat 12, and a ball screw nut 13. The screw nut seat 12 is connected to the ball screw 11 through the ball screw nut 13. The screw nut seat 12 and the milling head 6 are fixed on the milling head mounting plate 7. The movable slide 1 is driven by the servo motor 10, the right-angle reducer 9, and the ball screw 11 to move vertically up and down along the wide linear guide rail 16.

[0032] Specifically, a first slide rail and a hydraulic cylinder are provided above the movable slide plate 1. A sliding block is provided on the first slide rail. The hydraulic cylinder is fixed on the sliding block. The output shaft of the hydraulic cylinder is fixedly connected to the movable slide plate 1. The hydraulic cylinder is used to drive the movable slide plate 1 to move vertically. The hydraulic cylinder moves laterally along the first slide rail. A motor is provided on one side of the sliding block. The output shaft of the motor is fixedly connected to the sliding block. The motor is used to drive the sliding block to move laterally.

[0033] Specifically, when changing the tool, lift the lifting tool sleeve 15 upwards, press the hook 30 to disengage it from the hanging shaft 22, and then pull the lifting shaft 29 and the lifting tool sleeve 15 downwards to disengage it from the milling tool 31. At this time, the guide pin 28 also disengages downwards from the long groove on the side of the slot guide block 27. The lifting tool sleeve 15 rotates 90 degrees clockwise, at which point the milling tool 31 is exposed, and the milling tool 31 can be replaced.

[0034] Furthermore, the present invention also includes a PLC controller, wherein the PLC controller is electrically connected to the servo motor 10, the right-angle reducer 9, the displacement sensor 4, the milling head 6, and the vacuum cleaner, for controlling their movement.

[0035] In use, the PLC controller controls the moving slide 1 to move downwards, the lower end face of the lifting tool sleeve 15 contacts the test piece, the lower spring 21 contracts under force, squeezing the lifting shaft 29 to generate upward displacement, the height measuring base plate 2 fixed in the middle of the lifting shaft 29 also moves upwards, triggering the contact of the displacement sensor 4, the displacement sensor 4 sends a displacement signal, the moving slide 1 stops moving downwards, at this time the control software in the PLC controller can accurately determine the height position of the test surface; the milling head 6 calculates the height according to the control software, the servo motor 10 drives the milling head 6 to move downwards according to the set milling depth, and stops after reaching the position, the milling head 6 starts to rotate and work, the moving slide 1 moves laterally to complete the milling of the test surface, at this time the vacuum cleaner also sucks the milling chips out to the collection bucket through the negative pressure in the inner cavity of the lifting tool sleeve 15.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional precision micro-milling device for hardness testing, comprising a moving slide plate (1), a U-shaped mounting plate (5) and a milling head mounting plate (7) mounted on the moving slide plate (1), characterized in that, The displacement sensor (4) and the matching lifting unit are installed on the U-shaped mounting plate (5), the milling assembly is installed on the milling head mounting plate (7), the matching lifting unit comprises a spring group, a lifting shaft (29), a height measuring base plate (2) and a lifting cutter sleeve (15), the bottom of the lifting shaft (29) is rotatably provided with the lifting cutter sleeve (15), the lifting cutter sleeve (15) is used to contact the workpiece (32) to be tested, the spring group is used to control the vertical movement distance of the lifting shaft (29), the height measuring base plate (2) is arranged at the central position of the lifting shaft (29), one end of the height measuring base plate (2) is arranged at the bottom of the displacement sensor (4), the height measuring base plate (2) slides up and down with the lifting shaft (29), and the milling assembly comprises a milling head (6) and a driving unit.

2. The multi-functional precision micro-milling device for hardness testing according to claim 1, characterized in that, The U-shaped mounting plate (5) is fixed to one side of the moving slide plate (1), the side, away from the milling assembly, of the U-shaped mounting plate (5) is provided with a displacement sensor mounting seat (3), the displacement sensor (4) is fixed to the displacement sensor mounting seat (3), the inner cavity of the U-shaped mounting plate (5) is fixed with a slotted guide block (27) at the upper end, the two ends of the U-shaped mounting plate (5) are provided with through holes, the central part of the slotted guide block (27) is provided with a vertical slot, and the through holes, the vertical slot and the lifting shaft (29) are coaxially arranged.

3. The multi-functional precision micro-milling device for hardness testing according to claim 2, characterized in that, The lifting shaft (29) is matched with a guide pin (28) at the central part, the guide pin (28) slides up and down in the long slot of the slotted guide block (27), and one end of the guide pin (28) is provided with a split pin (33).

4. The multi-functional precision micro-milling device for hardness testing according to claim 3, characterized in that, The lower end of the U-shaped mounting plate (5) is fixed with a hanging shaft seat (23), and the front end of the hanging shaft seat (23) is provided with a hanging shaft (22).

5. The multi-functional precision micro-milling device for hardness testing according to claim 4, wherein, One side of the lifting cutter sleeve (15) is provided with a hook base (18) and a hook (30), the hook (30) and the hook base (18) are connected through a pin shaft (19), the hook (30) can swing back and forth in the inner cavity of the hook base (18) along the pin shaft (19), the hook (30) is matched with the hanging shaft (22), the rear end of the lifting cutter sleeve (15) is connected with a dust suction pipe joint (20) through screw threads, the dust suction pipe joint (20) is connected with a high-power dust collector through a pipeline, the inner cavity of the lifting cutter sleeve (15) is communicated with the dust suction pipe structure, and the milling iron filings are sucked away by the dust collector.

6. The multi-functional precision micro-milling device for hardness testing according to claim 1, wherein, The spring set includes an upper spring (24), a lower spring (21), a spring seat (25) and a round nut (26), the upper spring (24) is sleeved on the upper end of the lifting shaft (29), the inner hole of the spring seat (25) is in clearance fit with the lifting shaft (29), the lower end surface of the spring seat (25) is in abutment with the upper end surface of the upper spring (24), for limiting the radial deviation of the spring and transmitting the pre-tightening force, the round nut (26) is screwed into the external thread on the upper end of the lifting shaft (29), the spring seat (25) and the upper spring (24) are axially locked on the lifting shaft (29) by the upper end surface of the round nut (26) pressing the spring seat (25), so that the adjustment of the spring pre-tightening force is realized, and the lower spring (21) is arranged between the U-shaped mounting plate (5) and the lifting cutter sleeve (15).

7. The multi-functional precision micro-milling device for hardness testing according to claim 1, wherein, The middle of the moving slide plate (1) is provided with a rectangular notch, a wide linear guide rail (16) and a linear guide rail slider (17) are arranged in the rectangular notch, the linear guide rail slider (17) moves up and down along the wide linear guide rail (16), and the milling head mounting plate (7) is fixed on the linear guide rail slider (17).

8. The multi-functional precision micro-milling device for hardness testing according to claim 1, wherein, The milling head (6) is fixed below the milling head mounting plate (7), and the lower end of the milling head (6) is an NT tool shank (14) and a milling cutter (31).

9. The multi-functional precision micro-milling device for hardness testing according to claim 7, wherein, The upper end of the rectangular notch of the moving slide plate (1) is provided with a speed reducer seat (8), a driving unit is fixed on the speed reducer seat (8), the driving unit comprises a servo motor (10) and a right-angle speed reducer (9), the front flange of the servo motor (10) is fixedly connected with the input side flange of the right-angle speed reducer (9) through bolts, the front end of the right-angle speed reducer (9) is connected with a ball screw (11), a nut seat (12) and a ball nut (13), the nut seat (12) is connected with the ball screw (11) through the ball nut (13), the nut seat (12) and the milling head (6) are fixed on the milling head mounting plate (7), and the moving slide plate (1) moves up and down along the wide linear guide rail (16) under the drive of the servo motor (10), the right-angle speed reducer (9) and the ball screw (11).

10. The multi-functional precision micro-milling device for hardness testing according to claim 1, wherein, The moving slide plate (1) is provided with a first slide rail and an oil cylinder above, a sliding block is arranged on the first slide rail, the oil cylinder is fixed on the sliding block, the output shaft of the oil cylinder is fixedly connected with the moving slide plate (1), the oil cylinder moves transversely along the first slide rail, and one side of the sliding block is provided with a motor, and the output shaft of the motor is fixedly connected with the sliding block.

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