Curve follow-up machine tool

Abstract

The utility model relates to a curve follow-up machine tool, and belongs to the field of machine tools. The machine head comprises a machine head frame base, a self-aligning bearing, a hollow shaft, a balance arm device, a hoop device, a speed reduction motor lathe bed and a sliding saddle, the hollow shaft is installed on the machine head frame base through the self-aligning bearing, a speed reduction motor is installed at one end of the hollow shaft, and the sliding saddle is installed on the lathe bed. The device is structurally characterized by further comprising a swing angle device, a fan-shaped table device and a machine head device, the swing angle device is installed on the gear motor, the machine head device is installed at the other end of the hollow shaft, the machine head frame base is installed on the fan-shaped table device, the fan-shaped table device is installed on the sliding saddle, and the sliding saddle is installed on the machine head frame base. The hollow shaft is sleeved with the balance arm device and the hoop device, the balance arm device is connected with the machine head frame base, and the hoop device is installed on the machine head frame base.

Description

Technical Field

[0001] This utility model relates to a curve follower machine tool, belonging to the field of machine tools. Background Technology

[0002] Milling machines are machine tools that use milling cutters to process various surfaces of workpieces. The rotation of the milling cutter is usually the main motion, and the movement of the workpiece and the milling cutter is the feed motion. Grinding machines are machine tools that use grinding wheels to grind the surface of workpieces. Most grinding machines use high-speed rotating grinding wheels for grinding.

[0003] The cutting tool is mounted on the head assembly. When the cutting tool is a grinding wheel, the machine tool is a grinding machine; when the cutting tool is a milling cutter, the machine tool is a milling machine. When machining a workpiece using a grinding machine or milling machine, it is necessary to realize the fan-shaped motion of the head assembly and its linear motion in two perpendicular directions. At the same time, it is also necessary to realize the angle and position adjustment of the head assembly so that the workpiece can be machined by the cutting tool. In the existing technology, the friction is large when realizing the fan-shaped motion, and jamming is easy to occur. After adjusting the angle and position of the head assembly, its position cannot be fixed, resulting in poor stability of the head assembly during operation. The existing technology is limited by structure, and the coordination of the movements in various dimensions is not good. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the existing technology and to provide a curve follower machine tool with a reasonable structural design.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: The curve-following machine tool includes a headstock, a self-aligning bearing, a hollow shaft, a geared motor, a bed, and a slide saddle. The hollow shaft is mounted on the headstock via the self-aligning bearing. The geared motor is mounted on one end of the hollow shaft, and the slide saddle is mounted on the bed. Its structural features are: it also includes a swing angle device, a sector table device, and a headstock device. The swing angle device is mounted on the geared motor, the headstock device is mounted on the other end of the hollow shaft, the headstock is mounted on the sector table device, and the sector table device is mounted on the slide saddle.

[0006] Furthermore, the curve-following machine tool also includes a balance arm device, which is fitted outside the hollow shaft and connected to the machine head frame. The balance arm device includes a balance arm and a tension spring. The balance arm is fitted and fixed outside the hollow shaft, one end of the tension spring is connected to the balance arm, and the other end of the tension spring is connected to the machine head frame.

[0007] Furthermore, the curve-following machine tool also includes a clamping device, which is fitted around the hollow shaft and mounted on the headstock. The clamping device includes a tightening screw, a clamping body, a locking buckle, and a locking cylinder. The tightening screw is mounted on the headstock, the clamping body is fitted around the hollow shaft, the lower end of the clamping body contacts the tightening screw, and the upper end of the clamping body is locked by the locking buckle and the locking cylinder.

[0008] Furthermore, the locking buckle is U-shaped and has a round hole and an oblong hole. Each of the two clamp bodies has a locking pin installed at its upper end, with the two locking pins located in the round hole and oblong hole respectively. The cylinder of the locking cylinder is installed inside the locking buckle, and the piston rod of the locking cylinder abuts against the locking pin located in the oblong hole. The clamp body has an arc-shaped protrusion that contacts the tightening screw.

[0009] Furthermore, the swaying device includes a swaying seat and a swaying drive mechanism. The swaying seat is mounted on a geared motor, and the swaying drive mechanism cooperates with the swaying seat. The swaying seat is provided with a swaying seat cavity. The swaying drive mechanism includes a swaying drive motor, a swaying drive pulley, an eccentric shaft, and a swaying drive slider. The swaying drive pulley and the swaying drive slider are both mounted on the eccentric shaft. The swaying drive slider is located in the swaying seat cavity. The swaying drive pulley and the swaying drive motor are driven by a belt. The swaying drive motor and the eccentric shaft are both mounted on the headstock.

[0010] Furthermore, the swing angle device also includes a swing angle positioning mechanism, which is mounted on the swing angle seat and located below the swing angle seat cavity. The swing angle positioning mechanism includes a swing angle positioning base plate, a swing angle positioning cylinder, and a swing angle positioning top plate. The swing angle positioning base plate is mounted on the swing angle seat and located below the swing angle seat cavity. The cylinder of the swing angle positioning cylinder is mounted on the swing angle positioning base plate. The piston rod of the swing angle positioning cylinder is connected to the swing angle positioning top plate. The swing angle positioning top plate cooperates with the swing angle drive slider.

[0011] Furthermore, the fan-shaped platform device includes a fan-shaped platform, an oil tank pressure plate, a hydrostatic drive mechanism, and a fan-shaped rotation center shaft. The headstock is mounted on the fan-shaped platform via the fan-shaped rotation center shaft, and the headstock is driven by the hydrostatic drive mechanism to perform fan-shaped motion along the fan-shaped rotation center shaft. The oil tank pressure plate is installed at the bottom of the headstock and cooperates with the fan-shaped platform.

[0012] Furthermore, an oil tank partition bar with an annular structure is provided on the lower side of the oil tank pressure plate. The inner side of the oil tank partition bar is an oil filling chamber, and the outer side of the oil tank partition bar is an oil return groove. An oil filling hole is provided on the oil tank pressure plate, which is connected to the oil filling chamber. An oil drain hole is provided on the fan-shaped platform, which is connected to the oil return groove.

[0013] Furthermore, the hydrostatic drive mechanism includes a hydrostatic drive motor, a hydrostatic drive synchronous pulley, a hydrostatic drive synchronous belt, a hydrostatic guide wheel, a hydrostatic limit wheel, and a hydrostatic limit frame. The hydrostatic limit frame is mounted on the machine head frame, the hydrostatic limit wheel is mounted on the hydrostatic limit frame, and the hydrostatic limit wheel is in contact with the sector table.

[0014] Furthermore, the hydrostatic drive motor and the hydrostatic guide wheel are both mounted on the headstock, the hydrostatic drive synchronous belt pulley is mounted on the motor shaft of the hydrostatic drive motor, the two ends of the hydrostatic drive synchronous belt are respectively mounted on the two ends of the sector platform, and the hydrostatic drive synchronous belt pulley is engaged with the inner side of the hydrostatic drive synchronous belt, and the hydrostatic guide wheel is engaged with the outer side of the hydrostatic drive synchronous belt.

[0015] Furthermore, there are two hydrostatic guide wheels, both of which are in contact with the outer side of the hydrostatic drive synchronous belt. There is one hydrostatic drive synchronous belt pulley, which meshes with the inner side of the hydrostatic drive synchronous belt. The two hydrostatic guide wheels and the one hydrostatic drive synchronous belt pulley are arranged in a triangular structure.

[0016] Furthermore, the head assembly includes a head adjustment seat, an electric spindle, a cutting tool, an electric spindle clamp, a compensation mechanism, and a clamp positioning cylinder. The head adjustment seat is installed at the other end of the hollow shaft. The cutting tool is installed on the electric spindle. The electric spindle is installed on the electric spindle clamp. The electric spindle clamp and the compensation mechanism are both installed on the head adjustment seat, and the electric spindle clamp is connected to the compensation mechanism. The electric spindle clamp is positioned by the clamp positioning cylinder.

[0017] Furthermore, there is a preset offset angle α on the head adjustment seat, and the value of the preset offset angle α is in the range of 0-30°.

[0018] Furthermore, the electric spindle clamp includes a first clamp and a second clamp, the first clamp is connected to the second clamp, the compensation mechanism is installed on the second clamp, the cylinder of the clamp positioning cylinder is installed on the head adjustment seat, the piston rod of the clamp positioning cylinder is in contact with the upper stop iron, the upper stop iron is in contact with the upper side of the second clamp, the lower side of the second clamp is in contact with the lower stop iron, and the lower stop iron is in contact with the head adjustment seat.

[0019] Furthermore, the compensation mechanism includes a compensation motor, a coupling, a ball screw, and a nut seat. The compensation motor is mounted on the headstock, the motor shaft of the compensation motor is connected to the coupling, the coupling is connected to the ball screw, the ball screw passes through and is threadedly connected to the nut seat, and the nut seat is connected to the second clamp.

[0020] Compared with the prior art, this utility model has the following advantages: the curve-following machine tool can make the slide saddle move along the lower guide rail by setting the lower guide rail, and can make the fan-shaped table device move along the upper guide rail by setting the upper guide rail. The hydrostatic drive mechanism can drive the machine head frame to make fan-shaped motion along the fan-shaped rotation center axis. The rotation angle of the machine head device can be adjusted by driving the hollow shaft to rotate by the geared motor. The upper and lower position of the machine head device can be adjusted by driving the hollow shaft to swing up and down by setting the swing angle device, thereby realizing multi-dimensional adjustment of the machine head device. The balance arm can maintain the balance of the hollow shaft, and the position of the hollow shaft can be fixed by setting the clamping device to ensure the stability of the machine head assembly operation.

[0021] The fan-shaped platform device achieves fan-shaped movement by means of the oil tank pressure plate and the head frame relative to the fan-shaped platform. During the fan-shaped movement, a static pressure oil film is formed between the oil tank pressure plate and the fan-shaped platform, which can reduce friction and avoid jamming during the fan-shaped movement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the curve follower machine tool according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the left-side structure of the curve-following machine tool according to an embodiment of the present invention.

[0024] Figure 3 This is a front view structural schematic diagram of the head frame assembly according to an embodiment of the present utility model.

[0025] Figure 4 This is a left-side structural schematic diagram of the head frame assembly according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the left side of the balance arm device according to an embodiment of the present invention.

[0027] Figure 6 This is a left-side structural schematic diagram of the clamping device according to an embodiment of the present utility model.

[0028] Figure 7 This is a schematic diagram of the left side of the locking buckle according to an embodiment of the present utility model.

[0029] Figure 8 This is a top view of the locking buckle according to an embodiment of the present utility model.

[0030] Figure 9 This is a schematic diagram of the left-side structure of the swing angle device according to an embodiment of the present invention.

[0031] Figure 10 This is a top view of the swing angle drive mechanism according to an embodiment of the present invention.

[0032] Figure 11 This is a left-side structural schematic diagram of the head frame assembly according to an embodiment of the present invention.

[0033] Figure 12 This is a top view of the fan-shaped platform device according to an embodiment of the present invention.

[0034] Figure 13 This is a top view of the oil tank pressure plate according to an embodiment of the present invention.

[0035] Figure 14 This is a left-side structural schematic diagram of the oil tank pressure plate according to an embodiment of the present utility model.

[0036] Figure 15 This is a top view of the fan-shaped platform device according to an embodiment of the present invention.

[0037] Figure 16 This is a front view structural schematic diagram of the sector-shaped stage device according to an embodiment of the present utility model.

[0038] Figure 17 This is a front view structural schematic diagram of the head unit according to an embodiment of the present utility model.

[0039] Figure 18 This is a schematic diagram of the left-side structure of the head unit according to an embodiment of the present invention.

[0040] Figure 19 This is a front view structural schematic diagram of the head unit according to an embodiment of the present utility model.

[0041] In the diagram: 1. Headstock 2. Self-aligning bearing 3. Hollow shaft 4. Balance arm device 5. Clamping device 6. Gear motor 7. Swinging device 8. Sector table device 9. Headstock device 10. Bed 10. Saddle 101. Outer cover 102. Upper guide rail 103. Lower guide rail 104.

[0042] Balance arm 41, tension spring 42

[0043] 51. Tightening screw; 52. Clamp body; 53. Locking buckle; 54. Locking cylinder; 55. Locking pin; 56. Round hole; 57. Oblong hole.

[0044] 71. Swing angle seat; 72. Swing angle drive mechanism; 73. Swing angle positioning mechanism

[0045] 711, angle seat cavity

[0046] Swing drive motor 721, swing drive pulley 722, eccentric shaft 723, swing drive slider 724.

[0047] Sway angle positioning base plate 731, sway angle positioning hydraulic cylinder 732, sway angle positioning top plate 733

[0048] 81. Sector-shaped platform, 82. Oil tank pressure plate, 83. Hydrostatic drive mechanism, 84. Sector-shaped rotary center shaft

[0049] Oil drain hole 811

[0050] Oil tank spacer 821, oil filling tank 822, oil filling hole 823, oil return groove 824.

[0051] 831. Hydrostatic drive motor; 832. Hydrostatic drive synchronous belt pulley; 833. Hydrostatic drive synchronous belt; 834. Hydrostatic guide wheel; 835. Hydrostatic limit wheel; 836. Hydrostatic limit bracket.

[0052] 91. Headstock adjustment seat; 92. Electric spindle; 93. Cutting tool; 94. Electric spindle clamp; 95. Compensation mechanism; 96. Clamp positioning cylinder; 97. Upper stopper; 98. Lower stopper.

[0053] First clamp 941, Second clamp 942

[0054] Compensating motor 951, coupling 952, ball screw 953, nut seat 954. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0056] Example

[0057] See Figures 1 to 19 As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0058] The curve follower machine tool in this embodiment includes a headstock 1, a self-aligning bearing 2, a hollow shaft 3, a balance arm device 4, a clamping device 5, a geared motor 6, a swing angle device 7, a sector table device 8, a headstock device 9, a bed 10, and a slide saddle 101. The headstock 1, self-aligning bearing 2, hollow shaft 3, balance arm device 4, clamping device 5, geared motor 6, and swing angle device 7 constitute the headstock assembly. The headstock device 9 is mounted on the headstock assembly. The headstock assembly is mounted on the sector table device 8. The sector table device 8 is mounted on the slide saddle 101. The slide saddle 101 is mounted on the bed 10. An outer cover 102 is mounted on the bed 10.

[0059] The hollow shaft 3 in the headstock assembly is mounted on the headstock base 1 via the self-aligning bearing 2. The headstock base 1 is mounted on the fan-shaped platform device 8. The swing angle device 7 is mounted on the geared motor 6. The geared motor 6 is mounted on one end of the hollow shaft 3. The headstock device 9 is mounted on the other end of the hollow shaft 3. The balance arm device 4 and the clamp device 5 are both fitted around the hollow shaft 3. The balance arm device 4 is connected to the headstock base 1, and the clamp device 5 is mounted on the headstock base 1.

[0060] The upper and lower sides of the slide saddle 101 are respectively provided with an upper guide rail 103 and a lower guide rail 104. The upper guide rail 103 and the lower guide rail 104 are arranged perpendicularly. The upper guide rail 103 is arranged between the sector table device 8 and the slide saddle 101 to enable the sector table device 8 to move along the upper guide rail 103. The lower guide rail 104 is arranged between the slide saddle 101 and the bed 10 to enable the slide saddle 101 to move along the lower guide rail 104.

[0061] The balance arm device 4 in this embodiment includes a balance arm 41 and a tension spring 42. The balance arm 41 is fitted and fixed outside the hollow shaft 3. One end of the tension spring 42 is connected to the balance arm 41, and the other end of the tension spring 42 is connected to the headstock 1.

[0062] The clamping device 5 in this embodiment includes a tightening screw 51, a clamping body 52, a locking buckle 53, and a locking cylinder 54. The tightening screw 51 is installed on the head frame 1, the clamping body 52 is fitted outside the hollow shaft 3, the lower end of the clamping body 52 is in contact with the tightening screw 51, and the upper end of the clamping body 52 is locked by the locking buckle 53 and the locking cylinder 54.

[0063] In this embodiment, the locking buckle 53 is U-shaped and has a round hole 56 and an oblong hole 57. Each of the two clamp bodies 52 has a locking pin 55 installed at its upper end. The two locking pins 55 are located in the round hole 56 and the oblong hole 57, respectively. The cylinder of the locking cylinder 54 is installed in the locking buckle 53. The piston rod of the locking cylinder 54 abuts against the locking pin 55 located in the oblong hole 57. The clamp body 52 has an arc-shaped protrusion structure that contacts the tightening screw 51.

[0064] The swing angle device 7 in this embodiment includes a swing angle seat 71, a swing angle driving mechanism 72, and a swing angle positioning mechanism 73. The swing angle seat 71 is mounted on the geared motor 6, the swing angle driving mechanism 72 cooperates with the swing angle seat 71, and the swing angle positioning mechanism 73 is mounted on the swing angle seat 71 and is located below the swing angle seat cavity 711 of the swing angle seat 71.

[0065] In this embodiment, the swing angle seat 71 is provided with a swing angle seat cavity 711. The swing angle drive mechanism 72 includes a swing angle drive motor 721, a swing angle drive pulley 722, an eccentric shaft 723, and a swing angle drive slider 724. The swing angle drive pulley 722 and the swing angle drive slider 724 are both mounted on the eccentric shaft 723. The swing angle drive slider 724 is located inside the swing angle seat cavity 711. The swing angle drive pulley 722 and the swing angle drive motor 721 are driven by a belt. The swing angle drive motor 721 and the eccentric shaft 723 are both mounted on the head frame seat 1.

[0066] The swing angle positioning mechanism 73 in this embodiment includes a swing angle positioning base plate 731, a swing angle positioning cylinder 732, and a swing angle positioning top plate 733. The swing angle positioning base plate 731 is mounted on the swing angle seat 71 and is located below the swing angle seat cavity 711. The cylinder of the swing angle positioning cylinder 732 is mounted on the swing angle positioning base plate 731. The piston rod of the swing angle positioning cylinder 732 is connected to the swing angle positioning top plate 733. The swing angle positioning top plate 733 cooperates with the swing angle drive slider 724.

[0067] The sector-shaped platform device 8 in this embodiment includes a sector-shaped platform 81, an oil tank pressure plate 82, a hydrostatic drive mechanism 83, and a sector-shaped rotation center shaft 84. The headstock 1 is mounted on the sector-shaped platform 81 via the sector-shaped rotation center shaft 84, and the headstock 1 is driven by the hydrostatic drive mechanism 83 to perform sector-shaped movements along the sector-shaped rotation center shaft 84. The oil tank pressure plate 82 is installed at the bottom of the headstock 1 and cooperates with the sector-shaped platform 81.

[0068] In this embodiment, an oil tank partition 821 with an annular structure is provided on the lower side of the oil tank pressure plate 82. The inner side of the oil tank partition 821 is the oil filling tank 822, and the outer side of the oil tank partition 821 is the oil return groove 824. An oil filling hole 823 is provided on the oil tank pressure plate 82, which is connected to the oil filling tank 822. An oil drain hole 811 is provided on the fan-shaped platform 81, which is connected to the oil return groove 824.

[0069] The hydrostatic drive mechanism 83 in this embodiment includes a hydrostatic drive motor 831, a hydrostatic drive synchronous pulley 832, a hydrostatic drive synchronous belt 833, a hydrostatic guide wheel 834, a hydrostatic limit wheel 835, and a hydrostatic limit frame 836. The hydrostatic limit frame 836 is mounted on the headstock 1, and the hydrostatic limit wheel 835 is mounted on the hydrostatic limit frame 836, and the hydrostatic limit wheel 835 is in contact with the sector platform 81.

[0070] In this embodiment, the hydrostatic drive motor 831 and the hydrostatic guide wheel 834 are both mounted on the head frame 1. The hydrostatic drive synchronous belt pulley 832 is mounted on the motor shaft of the hydrostatic drive motor 831. The two ends of the hydrostatic drive synchronous belt 833 are respectively mounted on the two ends of the sector platform 81. The hydrostatic drive synchronous belt pulley 832 is engaged with the inner side of the hydrostatic drive synchronous belt 833, and the hydrostatic guide wheel 834 is engaged with the outer side of the hydrostatic drive synchronous belt 833.

[0071] In this embodiment, there are two hydrostatic guide wheels 834, both of which are in contact with the outer side of the hydrostatic drive synchronous belt 833. There is one hydrostatic drive synchronous belt pulley 832, which meshes with the inner side of the hydrostatic drive synchronous belt 833. The two hydrostatic guide wheels 834 and the one hydrostatic drive synchronous belt pulley 832 are arranged in a triangular structure.

[0072] The head assembly 9 in this embodiment includes a head adjustment seat 91, an electric spindle 92, a cutting tool 93, an electric spindle clamp 94, a compensation mechanism 95, and a clamp positioning cylinder 96. The head adjustment seat 91 is installed at the other end of the hollow shaft 3. The cutting tool 93 is installed on the electric spindle 92. The electric spindle 92 is installed on the electric spindle clamp 94. The electric spindle clamp 94 and the compensation mechanism 95 are both installed on the head adjustment seat 91, and the electric spindle clamp 94 is connected to the compensation mechanism 95. The electric spindle clamp 94 is positioned by the clamp positioning cylinder 96.

[0073] In this embodiment, the electric spindle clamp 94 includes a first clamp 941 and a second clamp 942. The first clamp 941 is connected to the second clamp 942. The compensation mechanism 95 is installed on the second clamp 942. The cylinder of the clamp positioning cylinder 96 is installed on the head adjustment seat 91. The piston rod of the clamp positioning cylinder 96 is in contact with the upper stop iron 97. The upper stop iron 97 is in contact with the upper side of the second clamp 942. The lower side of the second clamp 942 is in contact with the lower stop iron 98. The lower stop iron 98 is in contact with the head adjustment seat 91.

[0074] The compensation mechanism 95 in this embodiment includes a compensation motor 951, a coupling 952, a ball screw 953, and a nut seat 954. The compensation motor 951 is mounted on the headstock 1. The motor shaft of the compensation motor 951 is connected to the coupling 952. The coupling 952 is connected to the ball screw 953. The ball screw 953 passes through and is threadedly connected to the nut seat 954. The nut seat 954 is connected to the second clamp 942.

[0075] Specifically, the curve-following machine tool can move the slide saddle 101 along the lower guide rail 104, and the fan-shaped table device 8 along the upper guide rail 103. The static pressure drive mechanism 83 can drive the machine head frame 1 to make a fan-shaped movement along the fan-shaped rotation center axis 84. The rotation angle of the machine head device 9 can be adjusted by driving the hollow shaft 3 to rotate through the geared motor 6. The upper and lower positions of the machine head device 9 can be adjusted by driving the hollow shaft 3 to swing up and down with the self-aligning bearing 2 as the lever fulcrum through the swing angle device 7. In this way, the multi-dimensional adjustment of the machine head device 9 can be achieved.

[0076] Normally, when processing a workpiece, the workpiece makes a circular motion, and the headstock assembly moves linearly along the upper guide rail 103 and the lower guide rail 104, and makes a fan-shaped motion along the fan-shaped rotation center axis 84. The above three motion directions (upper guide rail 103, lower guide rail 104, and fan-shaped rotation center axis 84) are carried out synchronously, which can also make the rotation of the hollow shaft 3, the position adjustment of the headstock device 9 and the movement of the upper guide rail 103, the lower guide rail 104 and the fan-shaped rotation center axis 84 linked together.

[0077] This curve-following machine tool can also be used to process curves and surfaces of different workpieces through the expansion of the tool dresser.

[0078] There is a preset offset angle α on the head adjustment seat 91. The preset offset angle α is the angle formed between the vertical line of the hollow shaft 3 and the axis of the electric spindle 92. The value range of the preset offset angle α is 0-30°. Usually, the preset offset angle α is 20°. The purpose of setting the preset offset angle α is to offset the helical machining angle when machining workpieces such as screws and worms, so as to expand the machining range of the workpiece.

[0079] The sector table device 8 can be used to realize the sector motion of the machine tool. When realizing the sector motion through the sector table device 8, oil is injected into the oil injection hole 823 so that the oil injection chamber 822 is filled with oil. This generates a static pressure oil film between the upper surface of the sector table 81 and the lower surface of the oil chamber pressure plate 82. The static pressure drive motor 831 drives the static pressure drive synchronous pulley 832 to rotate. Since the static pressure drive synchronous pulley 832 meshes with the static pressure drive synchronous belt 833, the machine head support 1 is open. The fan-shaped rotating center shaft 84 is installed on the fan-shaped platform 81, which allows the headstock 1 and the oil tank pressure plate 82 to move in a fan shape along the fan-shaped rotating center shaft 84 on the fan-shaped platform 81. During the fan-shaped movement, the static pressure limit wheel 835 can limit the headstock 1. When no oil is injected into the oil filling hole 823, the oil tank partition bar 821 will contact the upper surface of the fan-shaped platform 81, so that the oil flows into the oil return groove 824 and is discharged through the oil drain hole 811.

[0080] The head frame assembly can adjust the position and angle of the head device 9. The head device 9 is installed at the other end of the hollow shaft 3. The hollow shaft 3 is driven to rotate by the geared motor 6, which can adjust the angle of the head device 9 as it rotates along the hollow shaft 3.

[0081] The sway angle drive motor 721 drives the sway angle drive pulley 722 to rotate, which in turn drives the eccentric shaft 723 to rotate. The eccentric shaft 723 drives the sway angle drive slider 724 to make eccentric movements, while simultaneously causing the sway angle drive slider 724 to slide within the sway angle seat cavity 711. This, in turn, drives the reduction motor 6 and the hollow shaft 3 to swing and adjust on the head frame 1 via the sway angle seat 711. After adjustment, the sway angle drive motor 721 stops rotating, and the sway angle positioning cylinder 732 presses against the sway angle positioning top plate 733, causing the sway angle positioning top plate 733 to abut against the sway angle drive slider 724, thereby achieving the positioning of the sway angle drive slider 724.

[0082] When adjusting the hollow shaft 3, the balance arm device 4 can play a balancing role to prevent the hollow shaft 3 from becoming unbalanced due to excessive weight of the head device 9. After adjustment, the position of the hollow shaft 3 is fixed by the clamping device 5. That is, the locking cylinder 54 presses the locking pin 55 located in the waist-shaped hole 57 to make the two clamping bodies 52 clamp onto the outer wall of the hollow shaft 3. In the initial state, the distance between the two clamping bodies 52 can be adjusted by turning the two tightening screws 51 according to the outer diameter of the hollow shaft 3.

[0083] As the cutting tool 93 grinds the workpiece, its outer diameter and width decrease. The position of the cutting tool 93 can be adjusted by the compensation mechanism 95 so that it can contact the workpiece and grind it. When adjusting the position of the cutting tool 93, the compensation motor 951 drives the coupling 952 to rotate, which in turn drives the ball screw 953 to rotate. Since the ball screw 953 is threadedly connected to the nut seat 954, and the nut seat 954 is connected to the electric spindle clamp 94, the electric spindle clamp 94 can move along the axis of the electric spindle 92 on the head adjustment seat 91 to adjust and compensate the position of the cutting tool 93. After the adjustment is completed, the clamp positioning cylinder 96 pushes the upper stop 97 so that the second clamp 942 is clamped between the upper stop 97 and the lower stop 98 to fix the position of the electric spindle clamp 94.

[0084] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A curve following machine tool comprising a headstock base (1), a self-aligning bearing (2), a hollow shaft (3), a reduction motor (6), a bed (10) and a slide saddle (101), the hollow shaft (3) is installed on the headstock base (1) through the self-aligning bearing (2), the reduction motor (6) is installed on one end of the hollow shaft (3), and the slide saddle (101) is installed on the bed (10), characterized in that: It also includes a swing angle device (7), a fan-shaped platform device (8) and a machine head device (9). The swing angle device (7) is mounted on the geared motor (6), the machine head device (9) is mounted on the other end of the hollow shaft (3), the machine head frame (1) is mounted on the fan-shaped platform device (8), and the fan-shaped platform device (8) is mounted on the slide saddle (101). ​ 2. A curvilinear follow-up machine bed according to claim 1, characterised in that: The curve-following machine tool also includes a balance arm device (4), which is fitted outside the hollow shaft (3) and connected to the headstock (1).

3. The curvilinear follow-up machine bed according to claim 1, characterized in that: The curve-following machine tool also includes a clamping device (5), which is fitted outside the hollow shaft (3) and mounted on the headstock (1).

4. A curvilinear follow-up machine bed according to claim 3, characterised in that: The clamping device (5) includes a tightening screw (51), a clamping body (52), a locking buckle (53), and a locking cylinder (54). The locking buckle (53) is U-shaped and has a round hole (56) and a waist-shaped hole (57). Each of the two clamping bodies (52) has a locking pin (55) installed at its upper end. The two locking pins (55) are located in the round hole (56) and the waist-shaped hole (57), respectively. The cylinder of the locking cylinder (54) is installed in the locking buckle (53). The piston rod of the locking cylinder (54) abuts against the locking pin (55) located in the waist-shaped hole (57). The clamping body (52) has an arc-shaped protrusion structure that contacts the tightening screw (51).

5. The curve-following machine tool according to claim 1, characterized in that: The swing angle device (7) includes a swing angle seat (71) and a swing angle drive mechanism (72). The swing angle seat (71) is mounted on the geared motor (6), and the swing angle drive mechanism (72) cooperates with the swing angle seat (71).

6. A curvilinear follow-up machine bed according to claim 5, characterised in that: The swing angle device (7) further includes a swing angle positioning mechanism (73), which is installed on the swing angle seat (71) and located below the swing angle seat cavity (711).

7. The curvilinear follow-up machine bed of claim 1, wherein: The fan-shaped platform device (8) includes a fan-shaped platform (81), an oil tank pressure plate (82), a hydrostatic drive mechanism (83), and a fan-shaped rotation center shaft (84). The headstock (1) is mounted on the fan-shaped platform (81) via the fan-shaped rotation center shaft (84), and the headstock (1) is driven by the hydrostatic drive mechanism (83) to make a fan-shaped movement along the fan-shaped rotation center shaft (84). The oil tank pressure plate (82) is installed at the bottom of the headstock (1), and the oil tank pressure plate (82) cooperates with the fan-shaped platform (81).

8. The curvilinear follow-up machine bed according to claim 7, characterized in that: The lower side of the oil tank pressure plate (82) is provided with an oil tank partition bar (821) in a ring structure. The inner side of the oil tank partition bar (821) is an oil filling tank (822), and the outer side of the oil tank partition bar (821) is an oil return groove (824). The oil tank pressure plate (82) is provided with an oil filling hole (823), which is connected to the oil filling tank (822). The fan-shaped platform (81) is provided with an oil drain hole (811), which is connected to the oil return groove (824).

9. The curvilinear follow-up machine bed of claim 1, wherein: The head assembly (9) includes a head adjustment seat (91), an electric spindle (92), a cutting tool (93), an electric spindle clamp (94), a compensation mechanism (95), and a clamp positioning cylinder (96). The head adjustment seat (91) is installed at the other end of the hollow shaft (3). The cutting tool (93) is installed on the electric spindle (92). The electric spindle (92) is installed on the electric spindle clamp (94). The electric spindle clamp (94) and the compensation mechanism (95) are both installed on the head adjustment seat (91), and the electric spindle clamp (94) is connected to the compensation mechanism (95). The electric spindle clamp (94) is positioned by the clamp positioning cylinder (96). And / or, there is a preset offset angle α on the head adjustment seat (91). The preset offset angle α ranges from 0 to 30°.

10. The curvilinear follow-up machine bed according to claim 9, characterized in that: The electric spindle clamp (94) includes a first clamp (941) and a second clamp (942). The first clamp (941) is connected to the second clamp (942). The compensation mechanism (95) is installed on the second clamp (942). The cylinder of the clamp positioning cylinder (96) is installed on the head adjustment seat (91). The piston rod of the clamp positioning cylinder (96) is in contact with the upper stop iron (97). The upper stop iron (97) is in contact with the upper side of the second clamp (942). The lower side of the second clamp (942) is in contact with the lower stop iron (98). The lower stop iron (98) is in contact with the head adjustment seat (91).

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