Servo tailstock of gear grinding machine and method for using the servo tailstock

Abstract

The present application relates to a servo tailstock of a gear grinding machine and a method for using the servo tailstock, and relates to the technical field of gear grinding machines. The servo tailstock includes a fixed seat, a tailstock slidably arranged on the fixed seat, a driving screw and a driving servo motor for rotating the driving screw are rotatably connected to the fixed seat, the driving screw passes through the tailstock and is threadedly connected to the tailstock, a connecting seat is installed on the tailstock, a top device is installed on the connecting seat, the top device includes a connecting cylinder rotatably connected to the connecting seat, a connecting shaft coaxially connected in the connecting cylinder, and an ejector pin coaxially connected to the end of the connecting shaft, the connecting shaft rotates synchronously with the connecting cylinder, a through hole is coaxially opened in the connecting shaft, a connecting drill is coaxially arranged in the through hole, and the top device also includes a drilling mechanism for opening the ejector pin and allowing the connecting drill to drill a hole on the end of the part. The present application has the effect of facilitating drilling of parts before grinding.

Description

Technical Field

[0001] The present application relates to the technical field of gear grinding machines, and in particular to a servo tailstock of a gear grinding machine and a method for using the servo tailstock. Background Art

[0002] With the rapid development of the domestic machining industry, the complexity and size of production and processing equipment are constantly changing, and the demand for medium and large CNC lathes is also increasing. CNC machine tools have better solved the problems of complex, precise, small batch, and multi-variety parts processing. Its processing methods include turning, grinding, polishing, etc. It is a flexible and high-efficiency automated machine tool, representing the development direction of modern machine tool control technology.

[0003] A Chinese patent with announcement number CN219093654U discloses a servo tailstock of a gear grinding machine, including a center mounting seat, a center mounted on the center mounting seat, two parallel guide rails, and a slider mounted on the guide rails. The center mounting seat and an adapter plate are mounted on the upper end surface of the slider, a servo motor and a lead screw are mounted on the adapter plate, one end of the lead screw is mounted in the center mounting seat, and the other end is equipped with a limit end cover and a buffer pad, a driving pulley is mounted on the rotating shaft of the servo motor, a synchronous pulley is mounted on the lead screw, and a belt is sleeved between the driving pulley and the synchronous pulley.

[0004] For the servo tailstock of the above-mentioned gear grinding machine, in the process of processing shaft parts, it is necessary to drill the end of the part in advance, and then fix one end of the part on the three-jaw chuck, the center acts on the drilling position of the part, and then the surface of the part is ground and processed through the turret.

[0005] This processing method, on the one hand, increases the number of processing steps and reduces the overall production efficiency. On the other hand, whether it is drilling or later grinding of parts, repeated centering is required. In the process of repeated centering, not only the labor intensity of workers is increased, but also the accuracy of later part processing is easily affected by the centering problem. Summary of the invention

[0006] In order to solve the problem that shaft parts need to be drilled and repeatedly aligned during the processing, the present application provides a servo tailstock for a gear grinding machine.

[0007] In the first aspect, the present application provides a gear grinding machine servo tailstock adopting the following technical solution:

[0008] A servo tailstock of a gear grinding machine comprises a fixed seat and a tailstock slidably arranged on the fixed seat, a driving screw and a driving servo motor for rotating the driving screw being rotatably connected to the fixed seat, the driving screw passes through the tailstock and is threadedly connected to the tailstock, a connecting seat is installed on the tailstock, a top device is installed on the connecting seat, the top device comprises a connecting cylinder rotatably connected to the connecting seat, a connecting shaft coaxially connected in the connecting cylinder, and an ejector pin coaxially connected to the end of the connecting shaft, the connecting shaft rotates synchronously with the connecting cylinder, a through hole is coaxially opened in the connecting shaft, a connecting drill bit is coaxially arranged in the through hole, and the top device also comprises a drilling mechanism for opening the ejector pin and enabling the connecting drill bit to drill a hole on the end of a part.

[0009] Optionally, the drilling mechanism includes a driving cylinder rotatably connected to the connecting shaft, a driving rod located in the driving cylinder is coaxially fixed to the connecting drill bit, the driving rod is passed through the driving cylinder and is threadedly connected to the driving cylinder, a drilling servo motor for rotating the driving cylinder is provided on the connecting seat, and the drilling mechanism also includes a switch assembly for opening the ejector pin and a rotating assembly for rotating the drill bit.

[0010] Optionally, the rotating assembly includes a connecting rod arranged between the connecting drill bit and the driving rod, the connecting rod is coaxial with the connecting drill bit and is located outside the driving cylinder, the connecting rod is fixedly connected to the connecting drill bit and is rotatably connected to the driving rod, a coaxial rotating cylinder is arranged outside the driving cylinder, the rotating cylinder is fixedly connected to the driving cylinder, a guide groove is opened on the inner wall of the rotating cylinder along its axial direction, and a guide block slidably arranged in the guide groove is fixed on the outer wall of the connecting rod.

[0011] Optionally, the switch assembly includes a connecting block fixed on the ejector pin, a rotating shaft is fixed on the connecting block, the ejector pin is rotatably connected to the connecting shaft via the rotating shaft, a telescopic rod is fixed on the rotating shaft, a connecting ring rotatably connected to the connecting rod is coaxially sleeved on the connecting rod, the end of the telescopic rod is rotatably connected to the connecting ring via the rotating shaft, and when the drill bit moves toward the outside of the through hole, the connecting ring drives the telescopic rod to rotate and causes the ejector pin to flip upward, so as to drill a hole in the end of the part.

[0012] Optionally, the connecting shaft includes a plurality of coaxial and cylindrical connecting sub-shafts, the diameter of the connecting sub-shafts gradually decreasing towards the direction approaching the part, a plurality of abutment grooves are radially opened on the connecting sub-shafts, an abutment rod is slidably connected in the abutment groove, an abutment ring is coaxially fixed on the connecting rod, the abutment ring has a conical structure, the end of the abutment rod abuts on the side wall of the abutment ring, when the abutment ring moves towards the direction away from the part, the abutment rod is pushed to move toward the outside of the abutment groove, an abutment spring is fixed in the connecting sub-shaft for pulling the abutment rod to move toward the axis of the connecting sub-shaft, the connecting ring is slidably arranged on the connecting rod, and magnet blocks that attract each other are fixed on the connecting ring and the abutment ring.

[0013] Optionally, a synchronization groove is opened on the inner wall of the connecting cylinder along the length direction, a synchronization rod slidably arranged in the synchronization groove is fixed on the outer wall of the connecting shaft, a plurality of clamping grooves are opened on the outer wall of the connecting shaft along the radial direction, a clamping rod is slidably connected in the clamping groove, the plurality of clamping grooves are evenly distributed within the range of 0° to 150° on the outer wall of the connecting shaft, and a clamping hole for clamping the clamping rod is opened on the inner wall of the connecting cylinder.

[0014] Optionally, the upper end surface of the connecting seat is open, and a positioning shaft is coaxially fixed to the end of the driving cylinder, and a positioning groove is provided on the side wall of the positioning shaft. A positioning block is provided on the output shaft of the drilling servo motor, which is clamped in the positioning groove and drives the positioning shaft to rotate. A baffle is slidably arranged in the connecting seat, and the baffle is vertically arranged. The end of the baffle abuts on the drilling servo motor and pushes the drilling servo motor to move in a direction close to the connected drill bit. A horizontally arranged adjusting cylinder is fixed in the connecting seat, and an adjusting shaft inserted into the adjusting cylinder is fixed on the baffle. An adjusting spring is installed in the adjusting cylinder, and an adjusting disk is fixed in the adjusting cylinder. A pressure sensor is provided on the adjusting disk, and two ends of the adjusting spring abut on the pressure sensor and the adjusting shaft respectively.

[0015] Optionally, a transmission shaft is coaxially fixed on the driving shaft of the drilling servo motor, a synchronous shaft is coaxially and rotatably connected on the transmission shaft, the positioning block is fixed on the synchronous shaft, a transmission rod is rotatably connected on the synchronous shaft, a radially recessed groove penetrating the connecting cylinder is provided at the end of the connecting cylinder, the transmission rod is inserted into the recessed groove, and mutually connected transmission grooves are provided on the transmission rod, the synchronous shaft and the transmission shaft, a transmission block is slidably arranged in the transmission groove, a transmission ring coaxial with the transmission shaft is fixed on the end face of the drilling servo motor, a driving ring is coaxially and rotatably connected in the transmission ring, a driving cylinder is fixed in the driving ring, the connecting rod end of the driving cylinder is fixed on the transmission block, the transmission block has an "L"-shaped structure, when the transmission block is connected to the transmission rod and the transmission shaft, the transmission shaft drives the transmission rod to rotate, and when the transmission block is connected to the synchronous shaft and the transmission shaft, the transmission shaft drives the synchronous shaft to rotate.

[0016] On the other hand, the present application discloses a method for using the above-mentioned gear grinding machine servo tailstock for processing rod-shaped parts, comprising the following steps:

[0017] S1. Install the rod-shaped part to be processed on the gear grinding machine, and drive the servo motor to drive the tailstock to move in the direction close to the part;

[0018] S2, when the ejector pin approaches the part, the driving servo motor stops working, and the drilling servo motor starts working, so that the connected drill bit rotates and moves towards the direction close to the part;

[0019] S3, when the connecting drill moves toward the part, the ejector pin rotates upward so that the connecting drill can drill a hole in the part;

[0020] S4, after the drilling is completed, the connecting drill moves toward the connecting shaft, and the ejector returns to the starting position during the movement;

[0021] S5. Drive the servo motor to drive the ejector pin to press against the drilling position of the part. In this process, the adjusting spring plays a certain buffering role to avoid damage to the part or the ejector pin. The elastic coefficient k of the adjusting spring is known. According to the elastic formula F=-kx, F is measured by the pressure sensor, and x represents the compression of the spring. According to the movement distance of the driving servo motor and the compression of x, the coordinates of the ejector pin at this time can be accurately calculated to facilitate precise processing of the part.

[0022] On the third aspect, the present application also discloses a method for using the above-mentioned gear grinding machine servo tailstock for processing cylindrical parts, comprising the following steps:

[0023] S1. Install the cylindrical part to be processed on the gear grinding machine, and drive the servo motor to drive the tailstock to move towards the direction close to the part;

[0024] S2, the ejector pin and the connecting shaft are inserted into the cylindrical workpiece, the end face of the connecting shaft abuts against the end face of the cylindrical part, the driving servo motor stops working, and the drilling servo motor starts working, so that the driving rod drives the connecting rod to move in the direction away from the part;

[0025] S3, the abutment ring pushes the abutment rod to move outward of the abutment groove, and the abutment rod abuts against the inner wall of the cylindrical part to achieve fixed positioning of the cylindrical part;

[0026] S4. In the above process, the adjusting spring plays a certain buffering role to avoid damage to parts or connecting shafts. The elastic coefficient k of the adjusting spring is known. According to the elastic formula F=-kx, F is measured by the pressure sensor, and x represents the compression of the spring. According to the distance driven by the servo motor and the compression of x, the coordinates of the ejector at this time can be accurately calculated to facilitate precise processing of parts.

[0027] The beneficial effects of the present invention are as follows: when processing a rod-shaped part, the top point stops moving near the end of the part, the ejector pin flips over, the connecting drill bit moves toward the outside of the connecting shaft, and the end of the part is drilled. After the drilling is completed, the connecting drill bit returns to the connecting shaft. At the same time, the ejector pin returns to the starting position, and the ejector pin is pressed against the drill hole, which is convenient for positioning the part, thereby facilitating subsequent part grinding and other processing; when processing a cylindrical part, when the inner diameter of the cylindrical part is not large, the conical surface of the ejector pin can be directly pressed against it. When the inner diameter of the cylindrical part is large, the ejector pin can be extended into the cylindrical part, and the end of the cylindrical part is pressed against the end face of the connecting sub-shaft. The connecting rod and the abutting ring act on the abutting rod, so that the abutting rod is pressed against the inner wall of the cylindrical part, which is convenient for positioning the part, and at the same time, it also plays a certain supporting role on its inner wall, reducing the possibility of deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the overall structure of the tailstock, connecting seat and center device.

[0030] Figure 3 It is a schematic diagram of the structure of the top device.

[0031] Figure 4 It is a schematic diagram of the connection structure between the drilling servo motor, the positioning block and the transmission rod.

[0032] Description of reference numerals: 1, fixed seat; 2, tailstock; 3, driving servo motor; 4, connecting cylinder; 5, connecting shaft; 6, ejector pin; 7, synchronous groove; 8, synchronous rod; 9, through hole; 10, connecting drill; 11, driving cylinder; 12, driving rod; 13, drilling servo motor; 14, connecting rod; 15, rotating cylinder; 16, guide groove; 17, guide block; 18, connecting block; 19, rotating shaft; 20, telescopic rod; 21, connecting ring; 22, ball; 23, ball groove; 24, abutment groove; 25. Abutment rod; 26. Abutment ring; 27. Abutment spring; 28. Snap-in groove; 29. ​​Snap-in rod; 30. Snap-in hole; 31. Positioning shaft; 32. Positioning groove; 33. Positioning block; 34. Baffle; 35. Adjustment cylinder; 36. Adjustment shaft; 37. Adjustment spring; 38. Adjustment disk; 39. Transfer shaft; 40. Synchronous shaft; 41. Transmission rod; 42. Give way groove; 43. Transfer groove; 44. Transfer block; 45. Transfer ring; 46. Drive ring; 47. Drive cylinder; 48. Connecting seat. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The present application embodiment discloses a gear grinding machine servo tailstock, referring to Figure 1, including a fixed seat 1 fixedly mounted on the machine tool and a tailstock 2 slidably arranged on the fixed seat 1, a driving screw rotatably connected to the fixed seat 1, the driving screw horizontally penetrates the tailstock 2 and is threadedly connected to the tailstock 2, a driving servo motor 3 is fixed on the fixed seat 1, and the output shaft of the driving servo motor 3 is coaxially fixed on the driving screw and drives the driving screw to rotate. A connecting seat 48 is fixed to the tailstock 2 by bolts, and a gasket is arranged between the connecting seat 48 and the tailstock 2, and the gasket is used to adjust the height of the connecting seat 48 in the vertical direction, and the thickness of the gasket is changed by applying pressure.

[0035] Reference Figure 1 and Figure 2 The connecting seat 48 is provided with a top device, which includes a connecting cylinder 4 rotatably connected to the connecting seat 48, a connecting shaft 5 coaxially connected in the connecting cylinder 4, and an ejector pin 6 coaxially connected to the end of the connecting shaft 5. The axis of the connecting cylinder 4 is parallel to the driving screw. The inner wall of the connecting cylinder 4 is provided with a synchronous groove 7 along its length direction. The outer wall of the connecting shaft 5 is fixed with a synchronous rod 8, which is slidably arranged in the synchronous groove 7, so that the connecting shaft 5 and the connecting cylinder 4 rotate synchronously. A through hole 9 is coaxially provided in the connecting shaft 5, and a connecting drill 10 is coaxially arranged in the through hole 9. The top device also includes a drilling mechanism for opening the ejector pin 6 and allowing the connecting drill 10 to drill a hole in the end of the part.

[0036] Reference Figure 2 and Figure 3 The drilling mechanism includes a driving cylinder 11 rotatably connected to the connecting shaft 5, the driving cylinder 11 is coaxial with the connecting shaft 5, a driving rod 12 is connected to the driving cylinder 11 through an internal thread, the driving rod 12 is connected to the connecting drill bit 10, and a drilling servo motor 13 for rotating the driving cylinder 11 is arranged on the connecting seat 48.

[0037] Reference Figure 2 and Figure 3 The drilling mechanism also includes a switch assembly for opening the ejector pin 6 and a rotating assembly for rotating the drill bit. The rotating assembly includes a connecting rod 14 coaxially connected to the end of the driving rod 12. One end of the connecting rod 14 is rotatably connected to the driving rod 12, and the other end of the connecting rod 14 is coaxially fixed to the end surface of the connecting drill bit 10. The connecting rod 14 is located outside the driving cylinder 11. A coaxial rotating cylinder 15 is provided on the outer sleeve of the driving cylinder 11. The rotating cylinder 15 is fixedly connected to the driving cylinder 11 and the length of the rotating cylinder 15 is much larger than the length of the driving cylinder 11. A guide groove 16 is opened on the inner wall of the rotating cylinder 15 along its axial direction. A guide block 17 is fixed to the outer wall of the connecting rod 14, and the guide block 17 is slidably connected in the guide groove 16.

[0038] The driving cylinder 11 drives the rotating cylinder 15 to rotate. During the rotation, the driving rod 12 drives the connecting rod 14 and the connecting drill bit 10 to move in a straight line. Since the guide block 17 is slidably set in the guide groove 16, when the rotating cylinder 15 rotates, the guide block 17, the connecting rod 14 and the connecting drill bit 10 rotate synchronously, so that the connecting drill bit 10 can drill holes on the end of the part later.

[0039] Reference Figure 2 and Figure 3 A receiving groove is provided on the connecting shaft 5, and the switch assembly includes a connecting block 18 fixed on the ejector pin 6. The connecting block 18 is located at the end face where the ejector pin 6 abuts against the connecting shaft 5. A rotating shaft 19 is fixed on the connecting block 18. The ejector pin 6 is rotatably connected to the connecting shaft 5 through the rotating shaft 19. A telescopic rod 20 is fixed on the rotating shaft 19. A connecting ring 21 is coaxially sleeved on the connecting rod 14. The end of the telescopic rod 20 is rotatably connected to the connecting ring 21 through a rotating shaft. When the drill bit moves in a direction close to the part, the connecting ring 21 drives the telescopic rod 20 to rotate, and the ejector pin 6 flips upward. When the ejector pin 6 flips a certain angle, the connecting drill bit 10 moves outside the through hole 9 and drills the end of the part during the continued movement. A plurality of balls 22 are embedded in the ejector pin 6. A ball 22 groove corresponding to the ball 22 is provided at the end of the connecting shaft 5. When the ejector pin 6 abuts against the end face of the connecting shaft 5, the ball 22 falls into the corresponding ball groove 23, which is used to share the torque concentrated on the rotating shaft 19 during the part processing.

[0040] Reference Figure 2 and Figure 3 The connecting shaft 5 includes a number of coaxially integrally formed connecting sub-shafts, which are cylindrical, and the diameters of the connecting sub-shafts gradually decrease toward the direction approaching the part. The connecting sub-shafts are radially provided with a plurality of abutment grooves 24, and an abutment rod 25 is slidably connected in the abutment grooves 24. An abutment ring 26 is coaxially fixed on the connecting rod 14, and the abutment ring 26 is a conical structure, and the end of the abutment rod 25 abuts against the side wall of the abutment ring 26. When processing a cylindrical part, the connecting sub-shaft is inserted into the cylindrical part, and the end of the cylindrical part abuts against the end face of one of the connecting sub-shafts. When the abutment ring 26 moves toward the direction away from the part, the abutment ring 26 pushes the abutment rod 25 to move toward the outside of the abutment groove 24, and the end of the abutment rod 25 abuts against the inner wall of the cylindrical part, providing a certain support to the inner wall and positioning the cylindrical part at the same time. An abutment spring 27 corresponding to the abutment rod 25 is fixed in the connecting sub-shaft. One end of the abutment spring 27 is fixed on the connecting sub-shaft, and the other end of the abutment spring 27 is fixed on the abutment rod 25 and pulls the abutment rod 25 to move toward the axis of the connecting sub-shaft.

[0041] Reference Figure 2 and Figure 3The connecting ring 21 abuts against the abutting ring 26, and the connecting ring 21 is slidably set on the connecting rod 14. The opposite end faces of the connecting ring 21 and the abutting ring 26 are fixed with magnet blocks that attract each other. When the connecting rod 14 moves toward the direction approaching the part, the abutting ring 26 pushes the connecting ring 21 to move, and drives the telescopic rod 20 to rotate through the connecting ring 21, thereby controlling the rotation of the ejector pin 6. When the connecting rod 14 moves toward the direction away from the part, under the action of the magnet block, the connecting ring 21 is driven to move toward the initial position until it moves to the initial position. When the connecting rod 14 continues to move, the ejector pin 6 abuts against the end face of the connecting shaft 5, so that the connecting ring 21 cannot continue to move. At this time, the connecting ring 21 is separated from the abutting ring 26.

[0042] Reference Figure 2 and Figure 3 The outer wall of the connecting shaft 5 is provided with a plurality of snap-in grooves 28 in the radial direction, and a snap-in rod 29 is slidably connected in the snap-in grooves 28. The plurality of snap-in grooves 28 are concentrated in the range of 0° to 150° of the outer wall of the connecting shaft 5 and are evenly distributed in the range. The inner wall of the connecting cylinder 4 is provided with a snap-in hole 30 for snap-in the snap-in rod 29. When installing the connecting shaft 5, the snap-in rod 29 is directed upward, and the snap-in rod 29 is received in the snap-in groove 28 under the action of gravity. The connecting shaft 5 is installed in the connecting cylinder 4, and the connecting shaft 5 is rotated, and the snap-in rod 29 is snap-into the snap-in hole 30. During the working process, the snap-in rod 29 is always located in the snap-in hole 30 under the action of centrifugal force. Because the range of the snap-in rod 29 is relatively wide, it is difficult for a plurality of snap-in rods 29 to completely detach from the snap-in hole 30. When the connecting shaft 5 needs to be removed, it is only necessary to rotate the connecting shaft 5 to move the snap-in rod 29 into the snap-in groove 28.

[0043] Reference Figure 2 , Figure 3 and Figure 4 The upper end surface of the connecting seat 48 is open, and a positioning shaft 31 is coaxially fixed to the end of the driving cylinder 11. A positioning groove 32 is opened on the side wall of the positioning shaft 31. A positioning block 33 is arranged on the output shaft of the drilling servo motor 13. The positioning block 33 is clamped in the positioning groove 32 and drives the positioning shaft 31 to rotate. A baffle 34 is slidably arranged in the connecting seat 48. The baffle 34 is vertically arranged and slides axially along the positioning shaft 31. The end of the baffle 34 abuts on the drilling servo motor 13 and pushes the drilling servo motor 13 to move in the direction close to the connected drill bit 10. A horizontally arranged adjusting cylinder 35 is fixed in the connecting seat 48, and an adjusting shaft 36 is fixed on the baffle 34. The adjusting shaft 36 is inserted into the adjusting cylinder 35. An adjusting spring 37 is installed in the adjusting cylinder 35. An adjusting disk 38 is fixed in the adjusting cylinder 35. A pressure sensor is installed on the adjusting disk 38. The two ends of the adjusting spring 37 abut on the pressure sensor and the adjusting shaft 36 respectively. The setting of the adjustment spring 37 can increase the movement speed of the tailstock 2 driven by the driving screw, thereby improving the processing efficiency of the parts.

[0044] The setting of the adjustment spring 37, on the one hand, plays a buffering role to reduce the possibility of damage to the ejector pin 6, the connecting shaft 5 or the parts due to impact. On the other hand, according to the elastic force calculation formula, F=-kx, F is measured by the pressure sensor, x represents the compression of the spring, and according to the distance driven by the servo motor 3 and the compression of x, the coordinates of the ejector pin 6 at this time can be accurately calculated to facilitate precise processing of the parts.

[0045] Reference Figure 3 and Figure 4 A transmission shaft 39 is coaxially fixed on the driving shaft of the drilling servo motor 13, and a synchronous shaft 40 is coaxially and rotatably connected to the transmission shaft 39. The positioning block 33 is fixed on the synchronous shaft 40, and a transmission rod 41 is rotatably connected to the synchronous shaft 40. A radially arranged clearance groove 42 is provided at the end of the connecting tube 4, and the clearance groove 42 penetrates the connecting tube 4 radially along the connecting tube 4. The setting of the clearance groove 42 facilitates the installation of the transmission rod 41 on the one hand, and on the other hand, during the installation of the drilling servo motor 13, the transmission rod 41 is inserted into the clearance groove 42, and the connecting tube 4 is driven to rotate by the transmission rod 41 to provide power to the ejector pin 6 to meet the needs of different working conditions. The transmission rod 41, the synchronous shaft 40 and the transmission shaft 39 are provided with transmission grooves 43 which are interconnected, and a transmission block 44 is slidably connected in the transmission groove 43. A transmission ring 45 is fixed on the end face of the drilling servo motor 13. The transmission ring 45 is coaxial with the transmission shaft 39, and a driving ring 46 is coaxially and rotatably connected in the transmission ring 45. A driving cylinder 47 is fixed in the driving ring 46. The driving cylinder 47 is radially arranged along the driving ring 46, and the connecting rod end of the driving cylinder 47 is fixed on the transmission block 44. The transmission block 44 has an "L"-shaped structure. The driving cylinder 47 acts on the transmission block 44. When the transmission block 44 connects the transmission rod 41 and the transmission shaft 39, the transmission shaft 39 drives the transmission rod 41 to rotate, thereby driving the connecting tube 4 and the ejector pin 6 to rotate, providing power for the ejector pin 6. When the transmission block 44 connects the synchronous shaft 40 and the transmission shaft 39, the transmission shaft 39 drives the synchronous shaft 40 to rotate.

[0046] The present application also discloses a method for using the above-mentioned gear grinding machine servo tailstock for processing rod-shaped parts, comprising the following steps:

[0047] S1, install the rod-shaped part to be processed on the gear grinding machine, clamp one end of the part with a three-jaw chuck, and drive the servo motor 3 to drive the tailstock 2 to move in a direction close to the part;

[0048] S2, when the ejector pin 6 approaches the part, the driving servo motor 3 stops working, and the drilling servo motor 13 starts working, so that the connected drill bit 10 moves toward the direction close to the part;

[0049] S3, when the connecting drill bit 10 moves toward the part, the connecting rod 14, the connecting ring 21, the abutting ring 26, the telescopic rod 20 and the rotating shaft 19 jointly cause the ejector pin 6 to flip over, so that the connecting drill bit 10 can drill a hole in the part;

[0050] S4, the connecting drill bit 10 moves linearly while rotating with the rotating cylinder 15, so as to facilitate drilling of the surface of the part. After the drilling is completed, the connecting drill bit 10 moves toward the inside of the connecting shaft 5, and the ejector pin 6 returns to the starting position during the movement;

[0051] S5. Drive the servo motor 3 to drive the ejector pin 6 to press against the drilling position of the part. In this process, the adjusting spring 37 plays a certain buffering role to avoid damage to the part or the ejector pin 6. The elastic coefficient k of the adjusting spring 37 is known. According to the elastic formula F=-kx, F is measured by the pressure sensor, and x represents the compression of the spring. According to the movement distance of the driving servo motor 3 and the compression of x, the coordinates of the ejector pin 6 at this time can be accurately calculated to accurately process the part.

[0052] The present application also discloses a method for using the above-mentioned gear grinding machine servo tailstock for processing cylindrical parts, comprising the following steps:

[0053] S1. Install the cylindrical part to be processed on the gear grinding machine, clamp one end of the part with a three-jaw chuck, and drive the servo motor 3 to drive the tailstock 2 to move in a direction close to the part;

[0054] S2, the ejector pin 6 and the connecting shaft 5 are inserted into the cylindrical workpiece, the end face of the connecting shaft is pressed against the end face of the cylindrical part, the driving servo motor 3 stops working, and the drilling servo motor 13 works, so that the driving rod 12 drives the connecting rod 14 to move in the direction away from the part;

[0055] S3, the connecting ring 21 is separated from the abutting ring 26, and the abutting ring 26 pushes the abutting rod 25 to move outward from the abutting groove 24, and the abutting rod 25 abuts against the inner wall of the cylindrical part to achieve fixed positioning of the cylindrical part and provide a certain support to the inner wall of the cylindrical part;

[0056] S4. In the above process, the adjusting spring 37 plays a certain buffering role to avoid damage to parts or connecting shafts. The elastic coefficient k of the adjusting spring 37 is known. According to the elastic formula F=-kx, F is measured by a pressure sensor, and x represents the compression of the spring. According to the distance driven by the servo motor 3 and the compression of x, the coordinates of the ejector pin 6 at this time can be accurately calculated to accurately process the parts.

[0057] The implementation principle of the embodiment of the present application is as follows: when processing a rod-shaped part, the top stops moving near the end of the part, and the ejector pin 6 flips to facilitate the movement of the connecting drill bit 10 toward the outside of the connecting shaft 5. The connecting drill bit 10 drills a hole on the end of the part. After the drilling is completed, the connecting drill bit 10 returns to the connecting shaft 5. At the same time, the ejector pin 6 returns to the starting position, and the ejector pin 6 is pressed against the drill hole, which is convenient for positioning the part, thereby facilitating subsequent part grinding and other processing; when processing a cylindrical part, when the inner diameter of the cylindrical part is not large, the conical surface of the ejector pin 6 can be directly pressed against it. When the inner diameter of the cylindrical part is large, the ejector pin 6 can be inserted into the cylindrical part, and the end of the cylindrical part is pressed against one of the end faces of the connecting sub-shafts. The connecting rod 14 and the abutment ring 26 act on the abutment rod 25, so that the abutment rod 25 moves toward the outside of the abutment groove 24, and the abutment rod 25 is pressed against the inner wall of the cylindrical part, which is convenient for positioning the part, and at the same time, it also plays a certain supporting role on its inner wall, reducing the possibility of deformation.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A servo tailstock of a gear grinding machine, comprising a fixed seat (1), a tailstock (2) slidably arranged on the fixed seat (1), a driving screw and a driving servo motor (3) for rotating the driving screw being rotatably connected to the fixed seat (1), the driving screw passing through the tailstock (2) and being threadedly connected to the tailstock (2), a connecting seat (48) being installed on the tailstock (2), and a top device being installed on the connecting seat (48), characterized in that: The top device comprises a connecting cylinder (4) rotatably connected to a connecting seat (48), a connecting shaft (5) coaxially connected in the connecting cylinder (4), and a top pin (6) coaxially connected to the end of the connecting shaft (5); the connecting shaft (5) rotates synchronously with the connecting cylinder (4); a through hole (9) is coaxially provided in the connecting shaft (5); a connecting drill bit (10) is coaxially provided in the through hole (9); the top device also comprises a drilling device for opening the top pin (6) and enabling the connecting drill bit (10) to drill a hole in the end of a part. The drilling mechanism comprises a driving cylinder (11) rotatably connected to a connecting shaft (5); a driving rod (12) located in the driving cylinder (11) is coaxially fixed to the connecting drill bit (10); the driving rod (12) is inserted into the driving cylinder (11) and is threadedly connected to the driving cylinder (11); a drilling servo motor (13) for rotating the driving cylinder (11) is arranged on the connecting seat (48); and the drilling mechanism further comprises a switch assembly for opening the ejector pin (6) and a rotating assembly for rotating the drill bit.

2. The servo tailstock of a gear grinding machine according to claim 1, characterized in that: The rotating assembly comprises a connecting rod (14) arranged between a connecting drill bit (10) and a driving rod (12); the connecting rod (14) is coaxial with the connecting drill bit (10) and is located outside the driving cylinder (11); the connecting rod (14) is fixedly connected to the connecting drill bit (10) and is rotatably connected to the driving rod (12); a coaxial rotating cylinder (15) is arranged outside the driving cylinder (11); the rotating cylinder (15) is fixedly connected to the driving cylinder (11); a guide groove (16) is provided on the inner wall of the rotating cylinder (15) along its axial direction; and a guide block (17) slidably arranged in the guide groove (16) is fixed on the outer wall of the connecting rod (14).

3. The servo tailstock of a gear grinding machine according to claim 2, characterized in that: The switch assembly comprises a connecting block (18) fixed on the ejector pin (6), a rotating shaft (19) fixed on the connecting block (18), the ejector pin (6) is rotatably connected to the connecting shaft (5) via the rotating shaft (19), a telescopic rod (20) is fixed on the rotating shaft (19), a connecting ring (21) rotatably connected to the connecting rod (14) is coaxially sleeved on the connecting rod (14), the end of the telescopic rod (20) is rotatably connected to the connecting ring (21) via the rotating shaft, and when the drill bit moves toward the outside of the through hole (9), the connecting ring (21) drives the telescopic rod (20) to rotate and causes the ejector pin (6) to flip upward, so as to drill a hole at the end of the part.

4. The servo tailstock of a gear grinding machine according to claim 3, characterized in that: The connecting shaft (5) comprises a plurality of coaxial and cylindrical connecting sub-shafts, the diameter of the connecting sub-shafts gradually decreases towards the direction approaching the part, a plurality of abutment grooves (24) are radially provided on the connecting sub-shafts, an abutment rod (25) is slidably connected in the abutment groove (24), an abutment ring (26) is coaxially fixed on the connecting rod (14), the abutment ring (26) is of a conical structure, the end of the abutment rod (25) abuts against the side wall of the abutment ring (26), when the abutment ring (26) moves towards the direction away from the part, the abutment rod (25) is pushed to move out of the abutment groove (24), an abutment spring (27) is fixed in the connecting sub-shaft for pulling the abutment rod (25) to move towards the axis of the connecting sub-shaft, the connecting ring (21) is slidably arranged on the connecting rod (14), and magnet blocks that attract each other are fixed on the connecting ring (21) and the abutment ring (26).

5. The servo tailstock of a gear grinding machine according to claim 1, characterized in that: The inner wall of the connecting tube (4) is provided with a synchronization groove (7) along the length direction, the outer wall of the connecting shaft (5) is fixed with a synchronization rod (8) slidably arranged in the synchronization groove (7), the outer wall of the connecting shaft (5) is provided with a plurality of clamping grooves (28) along the radial direction, a clamping rod (29) is slidably connected in the clamping groove (28), the plurality of clamping grooves (28) are evenly distributed in the range of 0° to 150° on the outer wall of the connecting shaft (5), and the inner wall of the connecting tube (4) is provided with a clamping hole (30) for clamping the clamping rod (29).

6. The servo tailstock of a gear grinding machine according to claim 4, characterized in that: The upper end surface of the connecting seat (48) is open, a positioning shaft (31) is coaxially fixed to the end of the driving cylinder (11), a positioning groove (32) is provided on the side wall of the positioning shaft (31), a positioning block (33) is provided on the output shaft of the drilling servo motor (13) and is engaged in the positioning groove (32) and drives the positioning shaft (31) to rotate, a baffle (34) is slidably provided in the connecting seat (48), the baffle (34) is vertically arranged, the end of the baffle (34) abuts against the drilling servo motor (13) and drives the drilling The servo motor (13) moves in a direction close to the connecting drill bit (10), a horizontally arranged adjusting cylinder (35) is fixed in the connecting seat (48), an adjusting shaft (36) inserted into the adjusting cylinder (35) is fixed on the baffle (34), an adjusting spring (37) is installed in the adjusting cylinder (35), an adjusting disk (38) is fixed in the adjusting cylinder (35), a pressure sensor is arranged on the adjusting disk (38), and two ends of the adjusting spring (37) are respectively abutted against the pressure sensor and the adjusting shaft (36).

7. The servo tailstock of a gear grinding machine according to claim 6, characterized in that: A transmission shaft (39) is coaxially fixed on the driving shaft of the drilling servo motor (13), a synchronous shaft (40) is coaxially and rotatably connected to the transmission shaft (39), the positioning block (33) is fixed on the synchronous shaft (40), a transmission rod (41) is rotatably connected to the synchronous shaft (40), a radially arranged clearance groove (42) penetrating the connecting cylinder (4) is provided at the end of the connecting cylinder (4), the transmission rod (41) is inserted into the clearance groove (42), the transmission rod (41), the synchronous shaft (40) and the transmission shaft (39) are provided with a transmission groove (43) that is interconnected, and a transmission block (44) is slidably arranged in the transmission groove (43). ), a transfer ring (45) coaxial with the transfer shaft (39) is fixed on the end face of the drilling servo motor (13), a drive ring (46) is coaxially and rotatably connected inside the transfer ring (45), a drive cylinder (47) is fixed inside the drive ring (46), the connecting rod end of the drive cylinder (47) is fixed on the transfer block (44), the transfer block (44) is in an "L"-shaped structure, when the transfer block (44) is connected to the transmission rod (41) and the transmission shaft (39), the transmission shaft (39) drives the transmission rod (41) to rotate, and when the transfer block (44) is connected to the synchronous shaft (40) and the transmission shaft (39), the transmission shaft (39) drives the synchronous shaft (40) to rotate.

8. A method for using the servo tailstock of a gear grinding machine as claimed in claim 7, characterized in that: The following steps are involved: S1, installing a rod-shaped part to be processed on a gear grinding machine, and driving a servo motor (3) to drive the tailstock (2) to move in a direction close to the part; S2, when the ejector pin (6) approaches the part, the driving servo motor (3) stops working, and the drilling servo motor (13) starts working, so that the connected drill bit (10) rotates and moves in a direction close to the part; S3, when the connecting drill bit (10) moves toward the part, the ejector pin (6) rotates upward so that the connecting drill bit (10) can drill a hole in the part; S4, the connecting drill bit (10) moves toward the inside of the connecting shaft (5) after the drilling is completed, and the ejector pin (6) returns to the starting position during the movement; S5. The servo motor (3) is driven to drive the ejector pin (6) to press against the drilling position of the part. During this process, the adjusting spring (37) plays a certain buffering role to avoid damage to the part or the ejector pin (6). The elastic coefficient k of the adjusting spring (37) is known. According to the elastic formula F=-kx, F is measured by a pressure sensor, and x represents the compression amount of the spring. According to the movement distance of the driving servo motor (3) and the compression amount of x, the coordinates of the ejector pin (6) at this time can be accurately calculated, so as to accurately process the part.

9. A method for using the servo tailstock of a gear grinding machine as claimed in claim 7, characterized in that: The following steps are involved: S1, installing the cylindrical part to be processed on the gear grinding machine, driving the servo motor (3) to drive the tailstock (2) to move in a direction close to the part; S2, the ejector pin (6) and the connecting shaft (5) are inserted into the cylindrical workpiece, the end face of the connecting shaft abuts against the end face of the cylindrical part, the driving servo motor (3) stops working, and the drilling servo motor (13) starts working, so that the driving rod (12) drives the connecting rod (14) to move in a direction away from the part; S3, the abutment ring (26) pushes the abutment rod (25) to move outward from the abutment groove (24), and the abutment rod (25) abuts against the inner wall of the cylindrical part, thereby achieving fixed positioning of the cylindrical part; S4. In the above process, the adjusting spring (37) plays a certain buffering role to avoid damage to parts or connecting shafts. The elastic coefficient k of the adjusting spring (37) is known. According to the elastic formula F=-kx, F is measured by a pressure sensor, and x represents the compression of the spring. According to the distance of the driving servo motor (3) and the compression of x, the coordinates of the ejector pin (6) at this time can be accurately calculated, so as to accurately process the parts.

Images