Workpiece overturning and re-clamping system of single-spindle turn-milling center

Abstract

The single-spindle turn-milling center has the advantages of simple structure, small size and low cost, but has the defect that only one end of a workpiece can be machined. The workpiece overturning and re-clamping system for the single-spindle turn-milling center is designed for the single-spindle turn-milling center, comprises a workpiece overturning mechanism, a material ejecting mechanism and a precision measuring device, and is mounted at a proper part of the single-spindle turn-milling center, so that a workpiece of which one end is machined by the single-spindle turn-milling center is overturned by 180 degrees, and the workpiece is clamped by the workpiece overturning mechanism. And the deviation is measured and corrected, clamping is carried out again, the clamping precision and rigidity are guaranteed, machining of the second end of the workpiece is further completed, and the use value of the single-spindle turn-milling center is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting machine tool accessory equipment, in particular to a special matching mechanism for a single-spindle turning and milling center. Background Art

[0002] Existing milling centers are equipped with two workpiece spindles to complete the entire processing of both ends of a complex workpiece, but the milling center equipped with two workpiece spindles has a complex structure, high cost, and large size. The single-spindle milling center has the advantages of simple structure, low cost, and small size, but the disadvantage is that it cannot complete the entire processing of both ends of the workpiece in one clamping.

[0003] Patent 93104213.5 discloses a single-spindle machining center, which can also only complete the machining of one end of a workpiece. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcoming that the existing single-spindle turning and milling center cannot complete all the processing of both ends of the workpiece. In order to achieve the above purpose, the present invention designs the following technical solutions:

[0005] The workpiece flipping and re-clamping system of the single-spindle turning and milling center includes a workpiece flipping mechanism, a material ejecting mechanism, and a precision measuring device, which are installed at the appropriate position of the single-spindle turning and milling center to flip the workpiece that has been processed on one end 180 degrees, measure and correct the deviation, re-clamp, and ensure the accuracy and rigidity of the clamping to further complete the processing of the second end.

[0006] The above-mentioned workpiece flipping mechanism includes a pliers body, a large gear, a small gear, a shaft, a long rack, a large jaw, a small jaw, a short rack, a push rod, a piston rod, a piston, an external screw sleeve, an adjusting nut, a cylinder barrel, a front cylinder head, a rear cylinder head, a flip shaft, a front bearing, a rear bearing, a flip seat, a torsion spring, a worm gear, a first servo motor, a worm, a bearing seat, and an angular contact bearing. The flip shaft is installed in the flip seat through the front and rear bearings, the worm gear is coaxially fixedly installed with the flip shaft, the front end of the flip shaft is coaxially fixedly installed with the pliers body, the rear end of the flip shaft is coaxially fixedly installed with the front cylinder head, the worm is coaxially fixedly installed with the first servo motor A, and is installed in the flip seat through the angular contact bearing pair and the bearing seat, the large gear and the small gear are coaxially fixedly installed and the shaft is installed inside The bearing can rotate on the shaft, the large gear meshes with the long rack, the small gear meshes with the short rack, the small jaw is fixedly installed with the short rack, the large jaw is fixedly installed with the long rack, the push rod connects the piston rod and the small jaw, when the piston is pushed forward, the two large gears will pass through the two long racks to pull the large jaw back in the opposite direction, when the inner angle of the large jaw is 60 degrees, the ratio of the pitch diameter of the large and small gears is 2:1, it can self-center and clamp cylindrical workpieces with a certain diameter range, the piston rod, piston, cylinder barrel, front cylinder head and rear cylinder head form a cylinder, or oil cylinder, the adjusting nut is used to adjust the axial position of the push rod, the outer screw sleeve is used to accommodate and fix the adjusting nut, and the torsion spring is used to apply unidirectional torque to the flip shaft to eliminate the gap and improve the rotation accuracy.

[0007] In the simplest case, the workpiece turning mechanism can be installed on the side of the turning and milling center directly or via two horizontal guide rails and an advance and retreat cylinder.

[0008] Considering that the upper surface of some workpieces is not allowed to contact the chuck surface or the jaw positioning surface when they are clamped for the second time, in this case, in order to ensure the clamping accuracy, the horizontality of the upper surface of the flipped workpiece must be detected and adjusted. For this purpose, the workpiece flipping structure should be installed on a fine-tuning mechanism that can adjust the horizontality of the workpiece around two orthogonal axes. Since the workpiece flipping mechanism can be used as a horizontal fine-tuning of an axis, only a horizontal fine-tuning mechanism perpendicular to the flip axis is required. The horizontal fine-tuning mechanism perpendicular to the flip axis includes an upward tilt seat, a pitch bearing, a downward tilt seat, a motor seat, a second servo motor, a coupling, a ball screw, a ball nut, a nut seat, a roller bearing, a roller shaft, an anti-backlash spring, an adjustment screw, a micro Guide rails, micro guide rail sliders, the upward tilt seat is installed on the downward tilt seat via two pitch bearings, the motor seat is installed on the downward tilt seat, the upper end of the motor seat is installed with a ball screw via paired bearings, and the lower end is installed with a second servo motor, the second servo motor is connected to the ball screw via a coupling, the ball nut is installed in the nut seat, the nut seat is installed on the slider of the micro guide rail, and can be pushed up and down by the ball screw, there are roller grooves on both sides of the nut seat, and there are roller bearings in the grooves, and the roller bearings are installed on the upward tilt seat by the roller shaft, and an anti-backlash spring is installed between the upward tilt seat and the downward tilt seat to eliminate the gap and improve the accuracy of angle fine-tuning, the adjusting screw is used to adjust the preload force of the anti-backlash spring, and controlling the second servo motor can achieve precise fine-tuning of the inclination angle of the upward tilt seat.

[0009] When the workpiece is flipped 180 degrees and the machined surface faces the chuck, if the machined surface of the workpiece is not allowed to contact the chuck surface or the jaw positioning surface, it is necessary to use the precision measuring device on the spindle box to detect the height of the four points on the front, back, left and right of the workpiece surface, and control the second servo motor to make fine adjustments according to the height difference between the front and back points, and control the first servo motor to make fine adjustments according to the height difference between the left and right points, until the horizontality of the workpiece meets the requirements, and then drive the chuck to clamp.

[0010] In order to prevent large stress caused by positioning error during the clamping process and affect the clamping accuracy, the above-mentioned workpiece turning mechanism should also be equipped with a centering error compensation mechanism to limit the stress caused by positioning error to within the range of preset spring force.

[0011] The centering error compensation mechanism includes left and right guide rails, a cylinder, a triangular seat, upper and lower guide rails, and a spring returner. The spring returner includes two springs, two gaskets, an outer cylinder, a small end cover, a connecting rod, and a large end cover. The downward tilt seat is installed on the triangular seat through the left and right guide rails. At the same time, the downward tilt seat is connected to the triangular seat through the spring returner and two nuts. The nuts are used to adjust the Y-direction position of the clamp. The triangular seat is installed on the side wall of the milling center through the upper and lower guide rails. At the same time, the triangular seat is connected to the push rod of the cylinder through the second spring returner.

[0012] Taking into account that the secondary clamping of some workpieces allows the upper surface to be close to the chuck surface or the jaw positioning surface, a lifting mechanism is also designed to apply a thrust to the workpiece toward the chuck during the chuck clamping process, so that the chuck can be clamped while the machined surface of the workpiece remains close to the chuck plane or the jaw positioning surface, so as to improve the clamping accuracy and rigidity. The ejection mechanism includes: an ejection plate, a ball stud, a swing arm, a swing arm shaft, a radial thrust bearing group, a swing cylinder, a slide, a guide rail, an ejection cylinder, a rear support, a nut, and an adjusting screw; the guide rail is installed on the side wall of the single-spindle turning and milling center parallel to the Z axis, the slide is installed on the guide rail, and is pushed up and down by the ejection cylinder to slide, the swing arm is installed on the slide via the swing arm shaft and the radial thrust bearing group, and can be pushed and pulled by the swing cylinder to swing in the horizontal plane, the ejection plate is installed on the ball stud at the end of the swing arm, and when the swing cylinder is pushed out, the ejection plate should be aligned with the bottom of the workpiece, the rear support can swing on the slide, and can be fine-tuned using the adjusting screw to adjust the final position of the ejection plate, and after the swing cylinder is pulled back, this mechanism will be in a position that does not interfere with the operation of other mechanisms.

[0013] The precision measuring device can utilize the existing tool measuring device of the turning and milling center, or adopt a laser distance measuring sensor, which is installed on the spindle box of the single-spindle turning and milling center, and the light is irradiated to the upper surface of the turned workpiece.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the main machine adopts a single-spindle turning and milling center structure, which is small in size, simple in structure, and low in cost. At the same time, it adopts a workpiece flipping and re-clamping system, which can realize the processing of the second end of the workpiece while ensuring accuracy, and can greatly improve the use value of the single-spindle turning and milling center. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more specifically and intuitively illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0016] Figure 1 Axonometric view of a single-spindle milling center equipped with a workpiece flipping and re-clamping system;

[0017] Figure 2 It is the axonometric view of the workpiece turning mechanism;

[0018] Figure 3 It is a horizontal cross-sectional view of the workpiece turning mechanism;

[0019] Figure 4 It is a vertical cross-sectional view of the workpiece turning mechanism;

[0020] Figure 5 It is a vertical cross-sectional view of the fine-tuning mechanism perpendicular to the flip axis;

[0021] Figure 6 It is a vertical cross-sectional view of the spring return device;

[0022] Figure 7 This is the axonometric view of the workpiece ejection mechanism;

[0023] Figure 8 It is a vertical cross-sectional view of the workpiece ejection mechanism;

[0024] Fig. 9 Axonometric view of the workpiece flipping and re-clamping system for a single-spindle turning and milling center;

[0025] Attached photos

[0026] 10 single spindle turning and milling center, 15 spindle box, 16 tool measuring device, 17 laser distance sensor, 19 ejector mechanism, 20 workpiece turning mechanism, 21 clamp body, 22 large gear, 23 small gear, 24 shaft, 25 long rack, 26 large clamp, 27 small clamp, 28 short rack, 29 ejector rod, 30 piston rod, 31 piston, 32 outer screw sleeve, 33 adjusting nut, 34 cylinder barrel, 35 front cylinder head, 36 rear cylinder head, 40 turning shaft, 41 front bearing, 42 rear bearing, 43 turning seat, 44 torsion spring, 45 worm wheel, 46 first servo motor, 47 worm, 48 bearing seat, 49 angular contact bearing pair, 50 tilt seat, 51 pitch bearing, 52 tilt seat, 53 motor seat, 54 second servo Servo motor, 55 coupling, 56 ball screw, 57 ball nut, 58 nut seat, 59 roller bearing, 60 roller shaft, 61 anti-backlash spring, 62 adjusting screw, 63 micro guide rail, 64 micro guide slider, 65 guide rail, 66 advance and retreat cylinder, 67 triangular seat, 68 guide rail, 69 spring returner, 70 spring, 71 gasket, 72 outer cylinder, 73 small end cover, 74 push rod, 75 nut, 76 large end cover, 81 ejector plate, 82 ball stud, 83 swing arm, 84 swing arm shaft, 85 radial thrust bearing group, 86 slide seat, 87 rear support, 88 adjusting screw, 89 nut, 90 swing cylinder, 92 guide rail, 91 ejector cylinder. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0028] Reference Figure 1 The workpiece turning and re-clamping system of the single-spindle turning and milling center includes a workpiece turning mechanism 20, a material ejecting mechanism 19 and a precision measuring device 16 or 17. The workpiece turning mechanism 20 and the material ejecting mechanism 19 are installed outside the side wall of a single-spindle turning and milling center 10, so as to turn the workpiece that has been processed at one end 180 degrees, measure and correct the deviation, or use the material ejecting mechanism to make the upper end face of the workpiece close to the positioning surface of the chuck claw and re-clamp it, so as to continue the processing of the second end of the workpiece.

[0029] Ginseng Figure 2 , Figure 3 , Figure 4 The workpiece turning mechanism 20 includes a clamp body 21, a large gear 22, a small gear 23, a shaft 24, a long rack 25, a large jaw 26, a small jaw 27, a short rack 28, a push rod 29, a piston rod 30, a piston 31, an outer nut 32, an adjustment nut 33, a cylinder 34, a front cylinder cover 35, a rear cylinder cover 36, a turning shaft 40, a front bearing 41, a rear bearing 42, a turning seat 43, a torsion spring 44, a worm gear 45, a first servo motor 46, a worm 47, a bearing seat 48, an angular contact shaft The turning shaft 40 is parallel to the X axis of the milling center, and the turning shaft 40 is installed in the turning seat 43 through the front and rear bearings 41 and 42. The worm gear 45 is fixedly installed with the turning shaft 40, the clamp body 21 is fixedly installed coaxially with the turning shaft 40, the worm 47 is fixedly installed coaxially with the first servo motor 46, and is installed in the turning seat 43 through the angular contact bearing pair 49 and the bearing seat 48. The large gear 22 is fixedly installed coaxially with the small gear 23 and has bearings installed inside, which can rotate on the shaft 24. The large gear 22 and the small gear 23 are fixedly installed coaxially. long The rack is meshed, the small gear 23 is meshed with the short rack 28, the small jaw is fixedly installed with the short rack 28, the large jaw is fixedly installed with the long rack 25, the push rod 29 connects the piston rod 30 and the small jaw 27, when the piston is pushed forward, the two large gears will pass through the two long racks 25 to make the large jaw pull back in the opposite direction, when the pitch diameter ratio of the large and small gears is 2:1, the inner angle of the large jaw is 60 degrees, it will be able to self-centering clamp cylindrical workpieces within a certain diameter range, and the center position remains unchanged. Additional jaws are installed on the large and small jaws to clamp smaller workpieces. The piston rod 30, the piston 31, the cylinder barrel 34, the front cylinder cover 35, and the rear cylinder cover 36 form a cylinder, or an oil cylinder. The adjusting nut 33 is used to adjust the axial position of the push rod 29, the outer screw sleeve 32 is used to fix the adjusting nut 33 to the rear of the piston rod 30, and the torsion spring 44 is used to apply a unidirectional torque to the flip axis to eliminate the gap and improve the rotation accuracy, which has been used for fine-tuning the horizontality around the flip axis.

[0030] In the simplest case, the workpiece turning mechanism can be installed on the side of the single-spindle turning and milling center directly or via two horizontal guide rails and an advance and retreat cylinder.

[0031] Ginseng Figure 2 and Figure 5; Considering that when some workpieces are clamped for the second time, their upper surfaces are not allowed to contact the chuck surface or the jaw positioning surface. In this case, in order to ensure the clamping accuracy, the horizontality of the upper surface of the flipped workpiece must be detected and adjusted. For this purpose, a horizontal fine-tuning mechanism perpendicular to the flip axis is designed, and the workpiece flipping mechanism described in Example 2 is installed on the horizontal fine-tuning mechanism perpendicular to the flip axis. It includes an upward tilt seat 50, a pitch bearing 51, a downward tilt seat 52, a motor seat 53, a second servo motor 54, a coupling 55, a ball screw 56, a ball nut 57, a nut seat 58, a roller bearing 59, a roller shaft 60, an anti-backlash spring 61, an adjustment screw 62, and a micro guide rail 63. The upward tilt seat 50 is installed on the downward tilt seat 52 via two pitch bearings 51. The motor seat 53 is installed on the lower tilt seat 52, and the ball screw 56 is installed on the upper end of the motor seat 53 through an angular contact bearing pair, and the second servo motor 54 is installed on the lower short end, which is connected to the ball screw 56 through a coupling 55. The ball nut 57 is installed in the nut seat 58, and the nut seat 58 is installed on the slider of the micro guide rail 63, which can be pushed up and down by the ball screw 56. There are roller grooves on both sides of the nut seat 58, and there are roller bearings 59 in the grooves. The bearings are installed on the upper tilt seat 50 by roller shafts 60. An anti-backlash spring 61 is installed between the upper tilt seat 50 and the lower tilt seat 52 to eliminate the gap and improve the accuracy of angle fine-tuning. The adjusting screw 62 is used to adjust the preload force of the anti-backlash spring. Controlling the second servo motor 54 can achieve precise fine-tuning of the inclination angle of the upper tilt seat 50.

[0032] When the workpiece is turned 180 degrees, the machined surface faces the chuck. If the machined surface of the workpiece is not allowed to contact the chuck surface or the jaw positioning surface, a precision measuring device is required to detect the height of the four points on the upper surface of the workpiece, and control the height according to the height difference between the front and rear points. second The servo motor 54 is fine-tuned to control the height difference between the left and right points. First The servo motor 46 performs fine adjustment until the workpiece reaches the required levelness, and then drives the chuck to clamp.

[0033] Ginseng Figure 2 , Figure 6 In order to prevent stress caused by positioning error during the clamping process and affect the clamping accuracy, the above-mentioned workpiece turning mechanism should also be equipped with a centering error compensation mechanism to limit the stress caused by positioning error within the range of spring force.

[0034] The centering error compensation mechanism includes left and right guide rails 65, cylinder 66, triangular seat 67, upper and lower guide rails 68, and spring return device 69. The spring return device 69 includes two springs 70, two gaskets 71, outer cylinder 72, small end cover 73, connecting rod 74, and large end cover 76. The lower tilt seat 52 is installed on the triangular seat 67 through the left and right guide rails 65. At the same time, the lower tilt seat 52 is connected to the triangular seat 67 through the spring return device 69 and two nuts 75. The nuts 75 are used to adjust the position of the clamp in the Y direction. The triangular seat 67 is installed on the outer wall of the bed through the upper and lower guide rails 68. At the same time, the triangular seat 67 is connected to the push rod of the advance and retreat cylinder 66 through the second spring return device 69. The advance and retreat cylinder 66 is pushed out, the workpiece turning mechanism 20 enters the working position, the advance and retreat cylinder 66 is pulled back, and the entire mechanism is returned to a position that does not interfere with the operation of other mechanisms.

[0035] Ginseng Figure 7 , Figure 8 , Fig. 9 Considering that the secondary clamping of some workpieces allows the upper surface to be close to the chuck surface or the jaw positioning surface, a lifting mechanism is also designed to apply a thrust to the workpiece toward the chuck during the chuck clamping process, so that the machined surface of the workpiece remains close to the chuck plane or the jaw positioning surface while the chuck is clamped, so as to improve the clamping accuracy and rigidity.

[0036] The ejection mechanism includes: an ejection plate 81, a ball stud 82, a swing arm 83, a swing arm shaft 84, a centripetal thrust bearing group 85, a swing cylinder 90, a slide 86, a guide rail 92, an ejection cylinder 91, a rear support 87, a nut 89, and an adjusting screw 88; the guide rail 92 is installed on the single-spindle milling center bed parallel to the Z axis, the slide 86 is installed on the guide rail 92, and is pushed up and down by the ejection cylinder 91. The swing arm 83 is driven by the swing arm shaft 84 and the centripetal thrust bearing group 85. The central thrust bearing group 85 is installed on the slide 86 and can be pushed and pulled by the swing cylinder 90 to swing in the horizontal plane. The ejection plate 81 is installed on the ball stud 82 at the end of the swing arm 83. When the swing cylinder 90 is pushed out, the ejection plate 81 is aligned with the bottom of the workpiece. The rear support 87 can swing on the slide 86 and can be fine-tuned using the adjusting screw 88 to adjust the final position of the ejection plate 81. After the swing cylinder 90 is pulled back, this mechanism will be in a position where it will not interfere with the operation of adjacent mechanisms.

[0037] The precision measuring device can utilize the existing tool measuring device 16 of the turning and milling center, or Fig. 9 A laser distance measuring sensor 17 is used, which is installed on the spindle box 15 of the turning and milling center, and the light is directed to the upper surface of the turned workpiece.

Claims

1. Single spindle turning and milling center workpiece flipping and re-clamping system, characterized by: The single-spindle turning and milling center workpiece flipping and re-clamping system comprises a workpiece flipping mechanism (20), a material ejecting mechanism (19), and a precision measuring device. The workpiece flipping mechanism (20) comprises a clamp body (21), a large gear (22), a small gear (23), a shaft (24), a long rack (25), a large jaw (26), a small jaw (27), a short rack (28), a push rod (29), a piston rod (30), a piston (31), an outer screw sleeve (32), an adjusting nut (33), a cylinder barrel (34), a front cylinder head (35), a rear cylinder head (36), a flip shaft (40), a front bearing (41), a rear bearing ( 42), a flip seat (43), a torsion spring (44), a worm wheel (45), a first servo motor (46), a worm (47), a bearing seat (48), and an angular contact bearing pair (49), wherein the flip shaft (40) is installed in the flip seat (43) via a front bearing (41) and a rear bearing (42), the front end of the flip shaft (40) is fixedly connected to the caliper body (21), the rear end of the flip shaft (40) is coaxially fixedly connected to the front cylinder cover (35), the worm wheel (45) is fixedly connected to the flip shaft (40), the worm (47) is coaxially fixedly connected to the first servo motor (46), and is connected via the angular contact bearing pair (49), the bearing The seat (48) is installed in the flip seat (43) and meshes with the worm gear (45). The large gear (22) and the small gear (23) are coaxially fixedly connected and have bearings installed therein, and can rotate on the shaft (24). The large gear (22) meshes with the long rack (25), the small gear (23) meshes with the short rack (28), the small jaw (27) is fixedly connected with the short rack (28), the large jaw (26) is fixedly connected with the long rack (25), and the push rod (29) connects the piston rod (30) and the small jaw (27). When the piston is pushed forward, the short rack (28) will drive the two small gears (23), and the two large gears will The large jaw (26) is pulled back in the opposite direction through two long racks (25). When the pitch diameter ratio of the large and small gears is 2:1 and the inner angle of the large jaw is 60 degrees, a cylindrical workpiece within a certain diameter range can be clamped by self-centering. The piston rod (30), the piston (31), the cylinder barrel (34), the front cylinder cover (35) and the rear cylinder cover (36) form an air cylinder or an oil cylinder. The adjusting nut (33) is used to adjust the axial position of the push rod (29). The outer screw sleeve (32) is used to accommodate and fix the adjusting nut (33). The torsion spring (44) is used to apply a unidirectional torque to the flip axis to eliminate the gap and improve the rotation accuracy, so as to be used for fine adjustment of the horizontality around the flip axis.

2. The single-spindle turning and milling center workpiece flipping and re-clamping system according to claim 1 is characterized in that: The turning seat (43) of the workpiece turning mechanism is installed on a horizontal fine-tuning mechanism perpendicular to the turning axis. The fine-tuning mechanism comprises an upward tilting seat (50), a pitch bearing (51), a downward tilting seat (52), a motor seat (53), a second servo motor (54), a coupling (55), a ball screw (56), a ball nut (57), a nut seat (58), a first bearing (59), a roller shaft (60), an anti-backlash spring (61), an adjustment screw (62), a micro guide rail (63), and a micro guide rail slider (64). The upward tilting seat (50) is installed on the downward tilting seat (52) via two pitch bearings (51), the motor seat (53) is installed on the downward tilting seat (52), the upper end of the motor seat (53) is installed with a ball screw (56) via a pair of bearings, and the lower end of the motor seat (53) is installed with a ball screw (56) via a pair of bearings. A second servo motor (54) is installed at the end, the second servo motor (54) is connected to a ball screw (56) via a coupling (55), a ball nut (57) is installed in a nut seat (58), the nut seat (58) is installed on a slider (64) of a micro guide rail (63), and can be pushed up and down by the ball screw (56), roller grooves are provided on both sides of the nut seat (58), a first bearing (59) is provided in the groove, and the bearing is installed on the upper tilt seat (50) by a roller shaft (60), and a clearance elimination spring (61) is installed between the upper tilt seat (50) and the lower tilt seat (52) for eliminating the gap and improving the accuracy of angle fine-tuning, and the adjusting screw (62) is used to adjust the spring preload force, and the second servo motor (54) can be controlled to realize the precise fine-tuning of the inclination angle of the upper tilt seat (50).

3. The single-spindle turning and milling center workpiece flipping and re-clamping system according to claim 1 or 2 is characterized in that: The workpiece turning mechanism is also provided with a centering error compensation mechanism, which includes left and right guide rails (65), a cylinder (66), a triangular seat (67), upper and lower guide rails (68), and a spring returner (69). The spring returner (69) includes two springs (70), two gaskets (71), an outer cylinder (72), a small end cover (73), a connecting rod (74), and a large end cover (76). The downward tilt seat (52) is installed on the triangular seat (67) through the left and right guide rails (65). At the same time, the downward tilt seat (52) is connected to the triangular seat (67) through the spring returner (69) and two connecting nuts (75). The connecting nuts (75) are used to adjust the Y-direction position of the clamp center. The triangular seat (67) is installed on the outer wall of the bed through the upper and lower guide rails (68). At the same time, the triangular seat (67) is connected to the push rod of the advance and retreat cylinder (66) through the second spring returner (69).

4. The single-spindle turning and milling center workpiece flipping and re-clamping system according to any one of claims 1-2, characterized in that: The ejection mechanism (19) comprises: an ejection plate (81), a ball stud (82), a swing arm (83), a swing arm shaft (84), a second bearing group (85), a swing cylinder (90), a slide seat (86), a guide rail (92), an ejection cylinder (91), a rear support (87), a nut (89), and an adjustment screw (88); the guide rail (92) is installed at an appropriate position of the milling center and aligned with its Z axis. vertical The slide (86) is mounted on the guide rail (92) and is pushed up and down by the ejection cylinder (91). The swing arm (83) is mounted on the slide (86) via the swing arm shaft (84) and the second bearing group (85) and can be pushed and pulled by the swing cylinder (90) to swing in the horizontal plane. The ejection plate (81) is mounted on the ball stud (82) at the end of the swing arm (83). When the swing cylinder (90) is pushed out, the ejection plate (81) is aligned with the bottom of the workpiece. The rear support (87) can swing on the slide (86) and can be fine-tuned by the adjusting screw (88) to adjust the final position of the ejection plate (81). After the swing cylinder (90) is pulled back, the mechanism will be in a position that does not interfere with the operation of other mechanisms.

5. The single-spindle turning and milling center workpiece flipping and re-clamping system according to any one of claims 1-2, characterized in that: The precision measuring device comprises one of the following: a. a laser distance measuring sensor (17) mounted on the spindle box (15) of the single-spindle turning and milling center (10), wherein light is emitted toward the end face of the workpiece in parallel with the Z axis; b. an original contact tool measuring head (16) of the single-spindle turning and milling center (10).

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