Automatic super-finish polishing machine for screw mother oil stone

Abstract

The application discloses a kind of automatic super-precision polishing machines of thread nut oil stone, including rack, clamping mechanism, positioning part, swing part, height adjusting part and polishing mechanism;Clamping mechanism is used to clamp workpiece thread nut and drive its linear translation and rotation;Positioning part is used to position the ball track of workpiece thread nut;The first end of swing part is hinged in the top surface of rack, and the second end is swingable relative to the first end in the first station corresponding to workpiece thread nut and the second station away from it;Height adjusting part includes dovetail plate and dovetail tenon, and the dovetail plate is fixed on the top surface of the second end of swing part;Dovetail tenon is slidably connected in dovetail groove;Polishing mechanism includes servo motor one, super-precision head and oil stone;Servo motor one is fixed on dovetail tenon;Super-precision head is fixed with the output shaft of servo motor one;Oil stone is clamped on super-precision head to polish the inner wall of the thread of workpiece thread nut.The application realizes high-precision, high-efficiency thread nut ball track super-precision polishing, and improves the applicability and reliability of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thread mother processing, and more particularly to a thread mother oil stone automatic super-finishing polishing machine. BACKGROUND

[0002] After processing, the thread mother cannot meet the process requirements due to the roughness and waviness of the ball channel, which affects the quality of the final product or causes a large amount of waste, so it is necessary to super-finish the thread mother according to the surface roughness.

[0003] Thread mother oil stone polishing is a process for fine processing of the surface of the thread mother, which aims to reduce the surface roughness and improve the smoothness. Oil stone polishing is a micro-cutting and plastic deformation of the workpiece surface using abrasive particles of oil stone, so as to remove the micro-unevenness on the surface and achieve the purpose of reducing the surface roughness and improving the smoothness.

[0004] However, the polishing precision and work efficiency of the thread mother polishing machine on the market are not ideal, which cannot meet the requirements of high precision and high efficiency. Based on such status, a high-precision thread mother oil stone super-finishing polishing machine is developed to super-finish the ball channel with high precision and high efficiency, which meets the process requirements of customers and is very necessary. SUMMARY

[0005] Therefore, the present application provides a thread mother oil stone automatic super-finishing polishing machine, which realizes high-precision and high-efficiency super-finishing polishing of the thread mother ball channel, and improves the applicability and reliability of the equipment.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A thread mother oil stone automatic super-finishing polishing machine comprises:

[0008] A rack;

[0009] A clamping mechanism is installed on the top surface of the rack to clamp a workpiece thread mother and drive linear translation and rotation thereof;

[0010] A positioning part is installed on the top surface of the rack on the side opposite to the clamping end of the clamping mechanism to position the ball channel of the workpiece thread mother;

[0011] A swing part is hinged at the first end to the top surface of the rack, and the second end is swingable relative to the first end to a first work position corresponding to the workpiece thread mother and a second work position away from the workpiece thread mother;

[0012] The height adjusting part comprises a dovetail plate and a dovetail tenon, the dovetail plate is vertically fixed at the top surface of the second end of the swing part, and the dovetail tenon is slidably connected in the dovetail groove of the dovetail plate;

[0013] The polishing mechanism comprises a servo motor one, an ultra-precision head and an oil stone, the servo motor one is fixed on the dovetail tenon, the ultra-precision head is fixed with the output shaft of the servo motor one, and the oil stone is clamped on the ultra-precision head to polish the inner wall of the screw thread of the workpiece nut.

[0014] The height adjusting part comprises a dovetail plate and a dovetail tenon, the dovetail plate is vertically fixed at the top surface of the second end of the swing part, and the dovetail tenon is slidably connected in the dovetail groove of the dovetail plate;

[0015] Preferably, the clamping mechanism comprises a linear guide rail one, a bearing box, a servo motor two and a chuck, the linear guide rail one is fixed on the top surface of the rack, the bearing box is slidably connected on the linear guide rail one, the servo motor two is fixed on the outer wall of the bearing box, and the output shaft of the servo motor two is fixed with one end of the main shaft in the bearing box, and the chuck is fixed on the other end of the main shaft and located outside the bearing box to clamp the workpiece nut.

[0016] Preferably, the clamping mechanism further comprises a ball screw one, a servo motor three and a connecting plate, a plurality of sliding blocks one are slidably connected on the linear guide rail one, the ball screw one is coaxially connected on the linear guide rail one, the servo motor three is fixed on one end of the linear guide rail one and drivingly connected with the ball screw one, and the connecting plate is fixed on the outer bottom wall of the bearing box, and the bottom surface of the connecting plate is fixed with the plurality of sliding blocks one and the nut on the ball screw one.

[0017] Preferably, the chuck is detachably connected with a nut angle positioning block. The workpiece nut is positioned by the nut angle positioning block, and in actual application, according to the shape of the nut, when the nut angle positioning block is installed on the chuck, the positioning part is not needed to be installed.

[0018] Preferably, the positioning part comprises a support, a measuring plate, a second ball screw, a fourth servo motor and a probe; the support is fixed on the top surface of the frame; the measuring plate is slidingly connected to the upper end of the support and its sliding direction is perpendicular to the sliding direction of the bearing box; the second ball screw is rotatably connected to the support and the nut on the second ball screw is fixed to the measuring plate; the fourth servo motor is fixed on the support and its output shaft is drivingly connected to the second ball screw; the probe is fixed on the plate surface of the measuring plate through a measuring head. The fourth servo motor drives the rotation of the second ball screw, and the rotary motion of the second ball screw can be converted into the linear motion of the measuring plate, so that the probe can correspond to the ball channel of the workpiece nut. When the workpiece nut moves horizontally, the probe can be inserted into the ball channel of the workpiece nut to position the workpiece nut.

[0019] Preferably, the swinging part comprises a swinging base, a rotating shaft, a swinging platform, a swinging support frame and a third ball screw; the swinging base is fixed on the frame; the rotating shaft is rotatably connected to the swinging base; the first end of the swinging platform is fixed to the rotating shaft; the swinging support frame is fixed on the top surface of the frame opposite to the second end of the swinging platform; the third ball screw is rotatably connected to the swinging support frame and is driven by a hand wheel; the nut on the third ball screw is drivingly connected to the second end of the swinging platform; the dovetail plate is vertically fixed on the top surface of the second end of the swinging platform. The third ball screw is driven to rotate by the hand wheel, and the swinging platform is swung around the rotating shaft to adjust the angle of the oil stone to correspond to the helix angle of the workpiece nut.

[0020] Preferably, the second end of the swinging platform is provided with a limiting block corresponding to the top surface of the swinging base to limit the swinging angle of the swinging platform; a plurality of locking bolts are screwed on the swinging platform and can abut against the top surface of the swinging base.

[0021] Preferably, the super finishing head comprises a super finishing head base, a super finishing head sliding table and an actuator cylinder; the super finishing head base is fixed on the output shaft of the first servo motor; the super finishing head sliding table is slidingly connected to the super finishing head base; the cylinder body of the actuator cylinder is fixed in the super finishing head sliding table, and its piston rod is fixed to the super finishing head base to output a constant thrust. The actuator cylinder provides a constant thrust so that the oil stone can tightly fit the inner wall of the workpiece nut thread, ensuring that the workpiece nut thread can be super finished and polished.

[0022] Preferably, it further comprises a gas detection slide valve; both ends of the super finishing head base are provided with adjustable limiting bolts; the valve body of the gas detection slide valve is fixed on the super finishing head sliding table, and the valve core in it can contact with the adjustable limiting bolts to compensate for the wear of the oil stone.

[0023] Preferably, the polishing mechanism further includes an oilstone support and an oilstone clamp; one end of the oilstone support is engaged with the ultra-precision head slide; the oilstone clamp is fixed to the other end of the oilstone support; and the oilstone is held in the oilstone clamp.

[0024] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an automatic ultra-precision polishing machine for ferrule polishing. The clamping mechanism enables the ferrule workpiece to be processed to perform precise linear translational and rotational linkage movements. The swinging part and the height adjustment part precisely adjust the position and angle of the oilstone according to the helix angle and radius of the ferrule ball track, so that the working surface of the oilstone matches the ball track of the ferrule workpiece, and at the same time, the center and angle of the working surface of the oilstone match the center and helix angle of the ball track of the ferrule workpiece, ensuring polishing accuracy. The ultra-precision head is connected to a servo motor, and the swing angle of the oilstone can be adjusted in real time during equipment operation without mechanical adjustment. It can also achieve swing forms that cannot be achieved by traditional structures by setting the motion mode of the servo motor, such as a composite swing formed by a combination of small swing angle high-frequency swing and large swing angle low-frequency swing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the polishing machine structure provided by the present invention;

[0027] Figure 2 This is a schematic diagram of the clamping mechanism structure provided by the present invention;

[0028] Figure 3 A schematic diagram of the positioning part structure provided by the present invention;

[0029] Figure 4 for Figure 3 Enlarged diagram of part A in the diagram;

[0030] Figure 5 Schematic diagram of the swing part structure provided by the present invention Figure 1 ;

[0031] Figure 6 Schematic diagram of the swing part structure provided by the present invention Figure 2 ;

[0032] Figure 7 This is a schematic diagram of the polishing mechanism provided by the present invention.

[0033] Among them, 1-frame; 2-clamping mechanism; 21-bearing box; 22-linear guide rail one; 221-slider one; 23-ball screw one; 24-servo motor three; 25-spindle; 26-chuck; 261-nut angle positioning block; 27-servo motor two; 28-connecting plate; 3-positioning part; 31-bracket; 32-linear guide rail two; 33-slider two; 34-ball screw two; 35-servo motor four; 36-measuring plate; 37-measuring head; 38-probe; 4-oscillating part; 41-oscillating base; 42-oscillating platform; 43-rotating shaft; 44-locking bolt; 45-swinging part 46-Handwheel 1; 47-Ball screw 3; 471-Hooke hinge; 48-Limit block; 5-Height adjustment part; 51-Dovetail plate; 52-Dovetail tenon; 53-Handwheel 2; 54-Belt; 55-Height positioning block; 56-Fasting bolt; 6-Polishing mechanism; 61-Servo motor 1; 62-Ultra-precision head; 621-Ultra-precision head base; 622-Ultra-precision head slide; 623-Actuating cylinder; 624-Adjustable limit bolt; 63-Oilstone bracket; 631-Bracket body; 632-Connecting column; 64-Air detection slide valve; 65-Oilstone clamp; 66-Oilstone; 7-Workpiece nut. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "a" and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "a" or "two" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] See appendix Figure 1According to embodiment 7 of the present invention, an automatic ultra-precision polishing machine for ferrule polishing achieves high-precision and high-efficiency ultra-precision polishing of ferrule ball tracks, while improving the applicability and reliability of the equipment. The machine includes a frame 1, a clamping mechanism 2, a positioning part 3, a swinging part 4, a height adjustment part 5, and a polishing mechanism 6. The frame 1 provides support, and a controller is provided within the frame 1 to control the operation of each component. The clamping mechanism 2 is installed on the top surface of the frame 1 to clamp the workpiece ferrule 7 and drive its linear translation and rotation. The clamping mechanism 2 enables the workpiece ferrule 7 to undergo precise linear translation and rotational linkage. The positioning part 3 is installed on the top surface of the frame 1 on the side opposite to the clamping end of the clamping mechanism 2 to position the ball track of the workpiece ferrule 7. The first end of the swinging part 4 is hinged to the top surface of the frame 1, and the second end can swing relative to the first end at a first working position corresponding to the workpiece ferrule 7 and a second working position away from it. The oscillating part 4 is used to match the helix angle of the workpiece nut 7 with the oilstone 66; the height adjustment part 5 includes a dovetail plate 51 and a dovetail tenon 52. The dovetail plate 51 has a dovetail groove that runs vertically through it. The lower end of the dovetail plate 51 is vertically fixed to the top surface of the second end of the oscillating part 4; the dovetail tenon 52 is slidably connected in the dovetail groove. The height adjustment part 5 can finely adjust the height of the oilstone 66 up and down to align the oscillation center of the ultra-precision head 62 with the center of the ball corresponding to the ball track of the workpiece nut 7; the polishing mechanism 6 includes a servo motor 61, an ultra-precision head 62, and an oilstone 66; the servo motor 61 is fixed to the dovetail tenon 52; the ultra-precision head 62 is fixed to the output shaft of the servo motor 61; the ultra-precision head 62 is driven to oscillate by the servo motor 61, and the ultra-precision head 62 is used to compensate for the wear of the oilstone 66 in real time when ultra-precision machining wears out; the oilstone 66 is clamped on the ultra-precision head 62 to polish the inner wall of the thread of the workpiece nut 7.

[0038] In this embodiment, the swinging part 4 and the height adjustment part 5 precisely adjust the position and angle of the oilstone 66 according to the helix angle and radius of the ball track of the workpiece nut 7, so that the working surface of the oilstone 66 matches the ball track of the workpiece nut 7. That is, the center and angle of the working surface of the oilstone 66 match the center and helix angle of the ball track of the workpiece nut 7, ensuring the ultra-precision polishing accuracy. The servo motor 61 can drive the ultra-precision head 62 to swing. When it is necessary to adjust the swing angle of the oilstone 66, no mechanical adjustment is required. It can be changed in real time during equipment operation. The swing mode of the servo motor 61 can also be set to achieve swing forms that cannot be achieved by traditional structures, such as a composite swing formed by a combination of high-frequency swing with a small swing angle and low-frequency swing with a large swing angle.

[0039] To further optimize the above technical solution, the clamping mechanism 2 includes a linear guide rail 22, a bearing housing 21, a servo motor 27, and a chuck 26; the linear guide rail 22 is fixed to the top surface of the frame 1; the bearing housing 21 is slidably connected to the linear guide rail 22; the servo motor 27 is fixed to the outer wall of the bearing housing 21, and its output shaft is fixed to one end of the main shaft 25 inside the bearing housing 21; the chuck 26 is fixed to the other end of the main shaft 25 and located outside the bearing housing 21 to clamp the workpiece nut 7. Figure 2 As shown, the spindle 25 is rotatably connected in the bearing housing 21. The spindle 25 is driven to rotate by the servo motor 27, thereby realizing the rotation of the workpiece nut 7. The sliding of the bearing housing 21 along the linear guide rail 22 enables the horizontal movement of the workpiece nut 7.

[0040] In some other specific embodiments, the clamping mechanism 2 further includes a ball screw 23, a servo motor 24, and a connecting plate 28; a plurality of sliders 221 are slidably connected on the linear guide rail 22; the ball screw 23 is coaxially rotatably connected to the linear guide rail 22; the servo motor 24 is fixed to one end of the linear guide rail 22 and drives the ball screw 23; the connecting plate 28 is fixed to the outer bottom wall of the bearing housing 21, and its bottom surface is fixed to the nuts on the plurality of sliders 221 and the ball screw 23.

[0041] Ball screws are a common mechanical transmission structure. The rotation of a ball screw causes the nut on it to move linearly along the ball screw. In this embodiment, the bearing housing 21 is fixed to the slider 221 via the connecting plate 28. The servo motor 24 drives the ball screw 23 to rotate. The nut on the ball screw 23 causes the slider 221 and the bearing housing 21 to move linearly relative to the ball screw 23, thereby realizing the horizontal movement of the workpiece nut 7.

[0042] To further optimize the above technical solution, the positioning unit 3 includes a bracket 31, a measuring plate 36, a second ball screw 34, a fourth servo motor 35, and a probe 38; the bracket 31 is fixed to the top surface of the frame 1; the measuring plate 36 is slidably connected to the upper end of the bracket 31 and its sliding direction is perpendicular to the sliding direction of the bearing housing 21; the second ball screw 34 is rotatably connected to the bracket 31 and its nut is fixed to the measuring plate 36; the fourth servo motor 35 is fixed to the bracket 31 and its output shaft is driven by the second ball screw 34; the probe 38 is fixed to the plate surface of the measuring plate 36 through the measuring head 37.

[0043] like Figure 3 and 4As shown, a linear guide rail 32 is fixed to the upper end of the bracket 31. Two sliders 33 are slidably connected to the linear guide rail 32. The two sliders 33 are arranged at intervals relative to the linear guide rail 32. One side panel of the measuring plate 36 is fixed to the side wall of the two sliders 33. The ball screw 34 is driven to rotate by the servo motor 35. The nut on the ball screw 34 drives the measuring plate 36. At the same time, the two sliders 33 enable the measuring plate 36 to slide relative to the linear guide rail 32.

[0044] To further optimize the above technical solution and improve the compactness of the structure, a gearbox is fixed on the bracket 31. The output shaft of the servo motor 35 is connected to the driving gear in the gearbox, and one end of the ball screw 34 is connected to the driven gear in the gearbox. The rotation of the ball screw 34 is achieved by driving the gear in the gearbox through the servo motor 35.

[0045] In some other embodiments, a nut angle positioning block 261 is detachably connected to the chuck 26. The nut angle positioning block 261 can realize the positioning of the helix angle of multiple workpiece nuts 7. Depending on the model of the workpiece nut 7, it is optional whether to install the nut angle positioning block 261 on the chuck 26; when the nut angle positioning block 261 is installed on the chuck 26, the positioning part 3 does not need to be installed.

[0046] In this embodiment, the swing unit 4 includes a swing base 41, a rotating shaft 43, a swing platform 42, a swing support frame 45, and a ball screw 47. The swing base 41 is fixed on the frame 1. The rotating shaft 43 is vertically rotatably connected to the swing base 41. The first end of the swing platform 42 is fixed to the rotating shaft 43. The swing support frame 45 is fixed on the top surface of the frame 1 relative to the second end of the swing platform 42. The ball screw 47 is rotatably connected to the swing support frame 45 and driven by a handwheel 46. The nut on the ball screw 47 is drively connected to the second end of the swing platform 42. The dovetail plate 51 is vertically fixed to the top surface of the second end of the swing platform 42.

[0047] like Figure 5 and 6 As shown, the nut on the ball screw 47 is connected to the second end of the swing platform 42 via the Hooke hinge 471. The Hooke hinge 471 enables the ball screw 47 to adapt to the angle change of the ball screw 47 caused by the swing of the swing platform 42. Rotating the handwheel 46 causes the ball screw 47 to rotate, thereby realizing the swing of the second end of the swing platform 42. By adjusting the swing angle of the swing platform 42, the oilstone 66 is matched with the helix angle of the workpiece nut 7.

[0048] To further optimize the above technical solution, a limiting block 48 is provided at the second end of the swing platform 42 corresponding to the top surface of the swing base 41 to limit the swing angle of the swing platform 42; a plurality of locking bolts 44 are screwed onto the swing platform 42 to abut against the top surface of the swing base 41.

[0049] like Figure 5 As shown, the top surface of the swing base 41 corresponding to the second end of the swing platform 42 is provided with a slot, and the limiting block 48 is engaged in the slot. During the swinging process, the second end of the swing platform 42 can contact the limiting block 48. When the swing platform 42 contacts the limiting block 48, the groove wall of the slot can clamp the limiting block 48, preventing the swing platform 42 from continuing to swing at a large angle. By replacing the limiting block 48 of different sizes, the swing angle of the swing platform 42 can be made to match the helix angle of the nut 7 of different types of workpieces. When the swing platform 42 swings to the correct position, the locking bolt 44 is tightened so that its threaded end abuts against the top surface of the swing base 41, thereby locking the swing platform 42 and preventing the swing platform 42 from swinging during the ultra-fine polishing process, which would affect the polishing effect.

[0050] In this embodiment, the dovetail tenon 52 engages with the dovetail groove on the dovetail plate 51 and can slide up and down; a long groove is provided on the panel of the dovetail plate 51, and the servo motor 61 is fixed on the dovetail tenon 52 with its output shaft passing through the long groove. The length of the long groove is the height adjustment range of the height adjustment part 5; the ultra-precision head 62 is located on the side panel of the dovetail plate 51 away from the dovetail groove and is fixed to the output shaft of the servo motor 61. A height positioning block 55 is provided below the long groove on the dovetail plate 51, and a protrusion is fixed on the dovetail tenon 52 and can slide up and down along the long groove; when the protrusion presses on the height positioning block 55, the height of the ultra-precision head 62 can be positioned, and the servo motor 61 drives the ultra-precision head 62 to swing to achieve ultra-precision polishing. By changing different types of height positioning blocks 55, the height of the swing axis of the ultra-precision head 62 can be matched with the ball center corresponding to the ball track of different types of workpiece nut 7. The side wall of the dovetail plate 51 is provided with fastening bolts 56. When the protrusion presses on the height positioning block 55, the fastening bolts 56 are screwed on so that the threaded end abuts against the side wall of the dovetail tenon 52 to lock the dovetail tenon 52 and prevent the oilstone 66 from moving up and down during the ultra-fine polishing process, thereby affecting the polishing quality.

[0051] To further optimize the above technical solution, a mounting plate is vertically fixed to the end of the panel facing the dovetail groove on the side of the dovetail plate 51, and a second handwheel 53 is provided on the mounting plate; a bearing chamber is provided on the swing platform 42; one end of the fourth ball screw is fixed to the lower end of the dovetail tenon 52, and the other end is located in the bearing chamber, and the nut on the fourth ball screw is rotatably connected to the bearing chamber; the second handwheel 53 is connected to the nut on the fourth ball screw through a pulley and a belt 54, and the rotation of the nut on the fourth ball screw causes the fourth ball screw to move up and down, thereby realizing the up and down movement of the dovetail tenon 52.

[0052] In this embodiment, the ultra-precision head 62 includes an ultra-precision head base 621, an ultra-precision head slide 622, and an actuating cylinder 623; the ultra-precision head base 621 is fixed on the output shaft of the servo motor 61; the ultra-precision head slide 622 is slidably connected to the ultra-precision head base 621; the cylinder body of the actuating cylinder 623 is fixed inside the ultra-precision head slide 622, and its piston rod is fixed to the ultra-precision head base 621 to output a constant thrust.

[0053] like Figure 7 As shown, servo motor 61 drives the ultra-precision head base 621 to swing. The ultra-precision head slide 622 is mounted on the ultra-precision head base 621 and connected to the ultra-precision head base 621 through actuation cylinder 623. The actuation cylinder 623 uses pneumatic or hydraulic drive to control the extension and retraction of its piston rod. The extension and retraction of the piston rod of the actuation cylinder 623 drives the ultra-precision head slide 622 to move up and down. The action of the actuation cylinder 623 causes the ultra-precision head slide 622 to output a set constant thrust, ensuring that the oilstone 66 can be pressed tightly against the inner wall of the workpiece nut 7, thereby ensuring the ultra-precision polishing effect.

[0054] To further optimize the above technical solution, it also includes a pneumatic detection slide valve 64; both the upper and lower ends of the ultra-precision head base 621 are provided with adjustable limit bolts 624; the valve body of the pneumatic detection slide valve 64 is fixed on the ultra-precision head slide 622, and the valve core inside can contact the adjustable limit bolts 624 to compensate for the wear of the oilstone 66.

[0055] The initial position of the oilstone 66 and the compensation stroke for wear of the oilstone 66 can be set by setting the initial position of the adjustable limit bolt 624. The valve core axis of the air-sensing slide valve 64 is parallel to the extension and retraction direction of the piston rod of the actuating cylinder 623. The two ends of the valve core of the air-sensing slide valve 64 are blocked by two adjustable limit bolts 624. By adjusting these two adjustable limit bolts 624, the position of the valve core can be adjusted. When the oilstone 66 wears, the valve body of the air-sensing slide valve 64 will move with the ultra-precision head slide 622. When the oilstone 66 wears to the set length, the air-sensing slide valve 64 is triggered, and the digital pressure gauge installed in its air circuit outputs a corresponding air pressure signal to the controller. The controller judges the wear of the oilstone 66 to determine that it has worn to the set position based on the air pressure change.

[0056] To further optimize the above technical solution, the polishing mechanism 6 also includes an oilstone support 63 and an oilstone clamp 65; one end of the oilstone support 63 is attached to the ultra-precision head slide 622; the oilstone clamp 65 is fixed to the other end of the oilstone support 63; and the oilstone 66 is clamped on the oilstone clamp 65.

[0057] The oilstone support 63 includes a support body 631 and a connecting column 632. One end of the support body 631 is snapped onto the side wall of the ultrafine oil slide 622 away from the dovetail plate 51 via a dovetail connection. The connecting column 632 is a hollow column, with one end vertically fixed to the other end of the support body 631. The oilstone clamp 65 is fixed to the other end of the connecting column 632. The oilstone clamp 65 is provided with an oil spray hole. The connecting column 632 has a hollow oil passage, one end of which is connected to the oil spray hole, and the other end is connected to the oil outlet of the ultrafine oil filtration system.

[0058] The working principle of the automatic ultra-precision polishing machine for nut polishing disclosed in this invention is as follows: When positioning the ball track of the workpiece nut 7, servo motor 4 35 drives ball screw 2 34 to move the measuring plate 36 and the measuring head 37 and probe 38 mounted on it synchronously, extending the probe 38 to a position aligned with the inner hole of the workpiece nut 7. Then, the clamping mechanism 2 translates the ball track area of ​​the workpiece nut 7 to the position of the probe 38, and the positioning part 3 moves the head of the probe 38 to the radius position of the ball track of the workpiece nut 7. The clamping mechanism 2 then horizontally translates the workpiece nut 7 a small distance, so that the head of the probe 38 contacts both sides of the ball track of the workpiece nut 7. The measuring head 37 records the relative position of these two contacts and calculates the intermediate value, thus calibrating the relative position of the ball track of the workpiece nut 7. Then, the clamping mechanism 2 moves horizontally, exposing the probe 38, and the positioning part 3 resets.

[0059] During ultra-precision machining, the clamping mechanism 2 aligns the starting position of the ball track of the workpiece nut 7 with the oilstone 66. The actuating cylinder 623 pushes the ultra-precision head slide 622, the oilstone support 63, the oilstone clamp 65, and the oilstone 66 therein to move, so that the working surface of the oilstone 66 contacts the ball track surface of the workpiece nut 7. At the same time, the controller sends ultra-precision oil into the oil passage in the oilstone support 63 and sprays it out from the oil spray hole of the oilstone clamp 65 to rinse the contact area between the oilstone 66 and the workpiece nut 7.

[0060] Servo motor 27 and servo motor 24 work together to cause chuck 26 to clamp workpiece nut 7 and move it in a spiral motion according to the pitch of its raceway. At the same time, servo motor 61 starts to drive the ultra-precision head 62 and the oilstone 66 on it to swing. The oilstone 66 begins to perform ultra-precision polishing on the raceway of workpiece nut 7. When the ultra-precision polishing reaches the end of the raceway of workpiece nut 7, one round of ultra-precision polishing is completed. Under the control of the controller, workpiece nut 7 is reversed according to its pitch, so that the oilstone 66 performs ultra-precision polishing from the end of the raceway to the beginning of the raceway. This completes a cycle and performs a second round of ultra-precision polishing on the raceway. The actual number of polishing rounds is determined by the controller and is automatically performed by each mechanism according to the process settings.

[0061] After the ultra-fine polishing is completed, all mechanisms are reset and the chuck 26 is released so that the operator or loading / unloading mechanism can take away the workpiece nut 7.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic ultra-precision polishing machine for mother-of-pearl using an oilstone, characterized in that, include: Rack (1), Clamping mechanism (2), which is installed on the top surface of the frame (1) to clamp the workpiece nut (7) and drive it to translate and rotate linearly; Positioning part (3) is installed on the top surface of the frame (1) on the side opposite to the clamping end of the clamping mechanism (2) for positioning the ball track of the workpiece nut (7); the positioning part (3) includes a bracket (31), a measuring plate (36), a second ball screw (34), a fourth servo motor (35) and a probe (38); the bracket (31) is fixed on the top surface of the frame (1); the measuring plate (36) is slidably connected to the upper end of the bracket (31) and its sliding direction is perpendicular to the sliding direction of the bearing box (21); the second ball screw (34) is rotatably connected to the bracket (31) and its nut is fixed to the measuring plate (36); the fourth servo motor (35) is fixed to the bracket (31) and its output shaft is driven to the second ball screw (34); the probe (38) is fixed on the plate surface of the measuring plate (36) through a measuring head (37); The swing part (4) has a first end hinged to the top surface of the frame (1) and a second end that can swing relative to the first end at a first station corresponding to the workpiece nut (7) and a second station away from it. The height adjustment part (5) includes a dovetail plate (51) and a dovetail tenon (52). The dovetail plate (51) has a dovetail groove that runs vertically through the top and bottom. The lower end of the dovetail plate (51) is vertically fixed to the top surface of the second end of the swing part (4). The dovetail tenon (52) is slidably connected in the dovetail groove. Polishing mechanism (6), the polishing mechanism (6) includes a servo motor (61), an ultra-precision head (62) and an oilstone (66); the servo motor (61) is fixed on the dovetail tenon (52); the ultra-precision head (62) is fixed to the output shaft of the servo motor (61); the oilstone (66) is clamped on the ultra-precision head (62) to polish the inner wall of the thread of the workpiece nut (7); The ultra-precision head (62) includes an ultra-precision head base (621), an ultra-precision head slide (622), and an actuating cylinder (623); the ultra-precision head base (621) is fixed on the output shaft of the servo motor (61); the ultra-precision head slide (622) is slidably connected to the ultra-precision head base (621); the cylinder body of the actuating cylinder (623) is fixed inside the ultra-precision head slide (622), and its piston rod is fixed to the ultra-precision head base (621) to output a constant thrust; It also includes a pneumatic detection slide valve (64); the two ends of the ultra-precision head base (621) are provided with adjustable limit bolts (624); the valve body of the pneumatic detection slide valve (64) is fixed on the ultra-precision head slide (622), and the valve core inside it can contact the adjustable limit bolts (624) to compensate for the wear of the oilstone (66).

2. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 1, characterized in that, The clamping mechanism (2) includes a linear guide rail (22), a bearing housing (21), a servo motor (27), and a chuck (26); the linear guide rail (22) is fixed to the top surface of the frame (1); the bearing housing (21) is slidably connected to the linear guide rail (22); the servo motor (27) is fixed to the outer wall of the bearing housing (21), and its output shaft is fixed to one end of the main shaft (25) inside the bearing housing (21); the chuck (26) is fixed to the other end of the main shaft (25) and located outside the bearing housing (21) to clamp the workpiece nut (7).

3. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 2, characterized in that, The clamping mechanism (2) further includes a ball screw (23), a servo motor (24), and a connecting plate (28); multiple sliders (221) are slidably connected on the linear guide rail (22); the ball screw (23) is coaxially rotatably connected to the linear guide rail (22); the servo motor (24) is fixed to one end of the linear guide rail (22) and drives the ball screw (23); the connecting plate (28) is fixed to the outer bottom wall of the bearing housing (21), and its bottom surface is fixed to the nuts on the multiple sliders (221) and the ball screw (23).

4. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 2, characterized in that, A nut angle positioning block (261) is detachably connected to the chuck (26).

5. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 1, characterized in that, The swinging part (4) includes a swinging base (41), a rotating shaft (43), a swinging platform (42), a swinging support frame (45), and a ball screw three (47); the swinging base (41) is fixed on the frame (1); the rotating shaft (43) is vertically rotatably connected to the swinging base (41); the first end of the swinging platform (42) is fixed to the rotating shaft (43); the swinging support frame (45) is fixed on the top surface of the frame (1) relative to the second end of the swinging platform (42); the ball screw three (47) is rotatably connected to the swinging support frame (45) and driven by a handwheel one (46); the nut on the ball screw three (47) is connected to the second end of the swinging platform (42); the dovetail plate (51) is vertically fixed on the top surface of the second end of the swinging platform (42).

6. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 5, characterized in that, The second end of the swing platform (42) is provided with a limiting block (48) corresponding to the top surface of the swing base (41) to limit the swing angle of the swing platform (42); a plurality of locking bolts (44) that can abut against the top surface of the swing base (41) are screwed onto the swing platform (42).

7. The automatic ultra-precision polishing machine for mother-of-pearl using an oilstone according to claim 1, characterized in that, The polishing mechanism (6) also includes an oilstone support (63) and an oilstone clamp (65); one end of the oilstone support (63) is attached to the ultra-precision head slide (622); the oilstone clamp (65) is fixed to the other end of the oilstone support (63); and the oilstone (66) is clamped on the oilstone clamp (65).

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