CN115255971A - Machining center head swinging device suitable for difficult-to-machine materials - Google Patents

Abstract

The invention relates to the technical field of metal processing, and provides a machining center swing head device suitable for difficult-to-machine materials, comprising a box body, a spindle box, a first swing mechanism, a second swing mechanism and a control system, the left side of the spindle box and the installation The auxiliary support mechanism on the box body rotates and cooperates, and the right side is drivingly connected with the second swing mechanism installed on the box body; the first swing mechanism can rotate under the drive of the power source and can drive the second swing mechanism to rotate to realize the main shaft The box swings its head and stops at a predetermined position; the control system receives the position data collected by the second swing mechanism's own acquisition unit and drives the power source to correct the predetermined position until the predetermined position reaches the target position. The unique transmission structure improves the transmission torque of the swing head part and the overall shape is compact. The shaft adopts a hollow structure, which greatly reduces the overall weight of the equipment and consumes less energy under the condition of ensuring rigidity.

Description

Machining center swing head device suitable for difficult-to-machine materials

technical field

The invention relates to the technical field of metal processing, in particular to a machining center swinging device suitable for difficult-to-machine materials.

Background technique

Horizontal five-axis machining centers are currently mostly used to process parts with complex profiles of difficult-to-machine materials such as titanium alloys. Therefore, the swing head parts are required to have the characteristics of high rigidity, high torque, and high precision. However, the existing equipment cannot meet the high torque, high The characteristics of rigidity, and the overall weight is large, which leads to high energy consumption.

Patent document CN208467747U discloses a mechanical single swing head for a five-axis compound machining center, a housing and an end cover, including: a housing, a swing head box, a first swing mechanism, a second swing mechanism, a first gear and a motor The casing is arranged on both sides of the swing head box, a first swing mechanism and a second swing mechanism are respectively arranged outside the two sides of the casing, and the first gear is arranged between the first swing mechanism and the swing mechanism. between the head boxes; the first swing mechanism is a duplex gearbox, and the radius of the first gear is greater than the radius of the second gear; the second swing mechanism includes: a rotating shaft core, a first distribution housing, a second Distribution shell, cylindrical roller bearing static ring, cylindrical roller bearing bearing ring, stepped pin and first bushing, but the swing head box of this design uses cylindrical roller bearings and angular contact ball bearings as supporting shafts, and the swing head The rigidity improvement is limited; the gear transmission mechanism is used as the second-stage deceleration mechanism, because the transmission ratio of the gear is small, the improvement of the swing head torque is limited.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a machining center swinging device suitable for difficult-to-machine materials.

According to the present invention, a machining center swinging device suitable for difficult-to-machine materials is provided, including:

box for support;

Spindle box, the left side is in rotational cooperation with the auxiliary supporting mechanism installed on the box body, and the right side is drivingly connected with the second swing mechanism installed on the box body;

The first swing mechanism can rotate under the drive of the power source and can drive the second swing mechanism to rotate so as to realize the headstock swing and stop at a predetermined position;

The control system receives the position data collected by the self-acquisition unit of the second swing mechanism and drives the power source to correct the predetermined position until the predetermined position reaches the target position or is within the range of the target position.

Preferably, the first swing mechanism is drivingly connected to the second swing mechanism through a synchronous belt under the drive of a power source.

Preferably, the power source adopts a servo motor, and the first swing mechanism includes a driven pulley expansion sleeve, a driven pulley, a synchronous belt, a driving pulley, and a driving pulley expansion sleeve;

The second swing mechanism includes a central shaft and a rolling worm gear. The driving pulley is set on the output shaft of the servo motor through a driving pulley expansion sleeve, and the driven pulley is set on the output shaft of the servo motor through a driven pulley expansion sleeve. The input end of the rolling worm gear, the output end of the rolling worm gear is connected to the central shaft, when the servo motor can drive the driving pulley to rotate and drive the rolling worm gear to run through the synchronous belt to make the central shaft rotate;

The central shaft is fixedly installed on the right side of the headstock.

Preferably, the auxiliary support mechanism includes a bearing seat, a bearing element, and a connecting shaft;

One end of the connecting shaft is fixedly installed on the left side of the headstock, and the outside of the other end is installed in the inside of the bearing seat through a bearing member, and the bearing seat is fixedly installed on the box body.

Preferably, both the connecting shaft and the central shaft are hollow shafts.

Preferably, the rolling worm gear includes a worm wheel and a worm, the worm wheel is arranged concentrically with the central axis, the lower end of the worm meshes with the worm wheel, and the driven pulley is sleeved on the worm wheel through a driven pulley expansion sleeve. upper end.

Preferably, the bearing part adopts a double-row cylindrical roller bearing;

The upper end of the worm is fixed on the front eccentric bearing seat through an angular contact ball bearing, and the lower end of the worm is fixed on the rear eccentric bearing seat through a double-row cylindrical roller bearing. The front eccentric bearing seat and the rear eccentric bearing seat are both fixed in the box.

Preferably, the axis of the worm is arranged parallel to the axis of the output shaft of the servo motor.

Preferably, the radius of the driving pulley is smaller than the radius of the driven pulley.

Preferably, the second swing mechanism includes a pneumatic clamp, a wear ring and a clamp mounting seat;

The pneumatic clamp is fixed on the box body through the clamp mounting base, and the pneumatic clamp can lock or loosen the wear-resistant ring on the central shaft under the control of the control system, so as to realize the locked positioning of the central shaft state or unlocked state.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts the transmission structure of servo motor, synchronous belt and worm gear, which improves the transmission torque of the swing head part. The swing head box adopts a lightweight design, which reduces the weight of the box body under the premise of meeting the rigidity requirements. At the same time, the internal installation space of the box is increased, so that the entire transmission system can be installed inside the box, thereby reducing the volume of the entire swing head, making the overall shape of the swing head compact, which is conducive to the development of miniaturization of equipment.

2. The present invention adopts the structure of auxiliary support and YRT turntable bearing to fix and support both sides of the headstock, which improves the overall rigidity of the oscillating head part. YRT turntable bearings are used for support, intersecting with cross roller bearings, and have Higher supporting rigidity and convenient installation make the central shaft directly made into an integral shaft instead of a split shaft, which simplifies the transmission structure of the entire central shaft.

3. The present invention adopts a rolling worm gear structure, which reduces transmission friction and improves the service life of the swing head.

4. The present invention adopts the eccentric adjustment structure of the worm, which can conveniently and accurately adjust the relative position of the worm gear and worm, and eliminate the backlash of the transmission. Compared with the prior art that uses gasket adjustment, the worm needs to be made into two sections, which improves the swing. The transmission accuracy of the head reduces the complexity of installation and adjustment.

5. The present invention adopts the structure of the pneumatic clamp, and the pneumatic clamp is clamped and matched with the wear-resistant ring fixed on the central shaft, thereby ensuring the fixed angle of the swing head and the precision during processing.

6. The present invention adopts the structure of the ring grating ruler to perform closed-loop control on the rotation position of the swing head, thus ensuring the swing accuracy of the swing head. At the same time, the ring grating ruler is directly installed at the tail section of the central shaft, which is compared with the transitional method used in the prior art. The shaft installation has the defects of accumulative assembly error and low feedback accuracy, which improves the feedback accuracy of the ring grating.

7. The shaft in the present invention adopts a hollow shaft, which greatly reduces the overall weight of the equipment while ensuring the rigidity, consumes less energy, and facilitates the routing of electricity, gas, and liquid pipelines.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the present invention, wherein, the casing is not drawn;

Fig. 3 is a front cross-sectional schematic diagram of the present invention;

Fig. 4 is a schematic side sectional view of the present invention;

Fig. 5 is the enlarged schematic diagram of the structure of the upper end position of the worm;

Fig. 6 is a structural enlarged schematic diagram of the position of the output shaft of the servo motor;

FIG. 7 is an enlarged schematic diagram of the structure of the lower end of the worm.

The figure shows:

1-box 19-wear ring

2-Spindle box 20-Ring scale

3- Electric spindle 21- Grating shield

4-end cover 22-grating mounting plate

5-Auxiliary support mechanism 23-Clamp mounting seat

6-Second swing mechanism 24-Front eccentric bearing seat

7-first swing mechanism 25-angular contact ball bearing

8-Motor mounting plate 26-Front bearing cover

9-adjusting block 27-worm

10-Servo motor 28-Driven pulley expansion sleeve

11-bearing seat 29-driven pulley

12-Bearing cover 30-Timing belt

13-Double row cylindrical roller bearing 31-Drive pulley

14-Connecting shaft 32-Drive pulley expansion sleeve

15-YRT turntable bearing 33-Expansion sleeve gland

16-central shaft 34-rear eccentric bearing housing

17-Worm gear 35-Double row cylindrical roller bearing

18-Pneumatic clamp 36-Rear bearing cover

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Example 1:

The present invention provides a machining center oscillating device suitable for difficult-to-machine materials, including a box body 1, a spindle box 2, an auxiliary support mechanism 5, a first oscillating mechanism 6, a second oscillating mechanism 7 and a control system, the box body 1 It is used for support and is the supporting structure of the whole device. The electric spindle 3 is installed on the headstock 2, which is the output end of the equipment. The mechanism 5 is used to support the left side of the spindle box 2 when the spindle box 2 rotates, and the right side of the spindle box 2 is drivingly connected with the second swing mechanism 7 installed on the box body 1, and the second swing mechanism 7 can drive the spindle when it rotates Box 2 rotates.

The first swing mechanism 6 can rotate under the drive of the power source and can drive the second swing mechanism 7 to rotate and then realize the headstock 2 to swing and stop at a predetermined position. The power source preferably adopts a motor; the control system receives the second swing mechanism 7 itself The position data collected by the acquisition unit is compared with the target position. When the comparison result does not match the target position, a control command is issued and the power source is driven to correct the predetermined position until the predetermined position reaches the target position or is within the range of the target position. , to achieve the purpose of high-precision machining.

Specifically, the first swing mechanism 6 can be driven and connected with the second swing mechanism 7 through the timing belt 30 under the drive of the motor. The first swing mechanism 6 includes a driven pulley expansion sleeve 28, a driven pulley 29, and a timing belt 30. , driving pulley 31 and driving pulley expansion sleeve 32, the second swing mechanism 7 includes central shaft 16, rolling worm gear, driving pulley 31 is sleeved on the output shaft of the motor by driving pulley expansion sleeve 32, driven pulley 29 The driven pulley expansion sleeve 28 is set on the input end of the rolling worm gear, and the output end of the rolling worm gear is connected to the central shaft 16. The motor can drive the driving pulley 31 to rotate and drive the rolling worm gear to run through the synchronous belt 30 to make the center The shaft 16 rotates, and the central shaft 16 is fixedly installed on the right side of the headstock 2, and the rotation of the central shaft 16 can drive the central shaft 16 to rotate together.

The auxiliary support mechanism 5 plays the role of supporting the left side of the headstock 2, including the bearing seat 11, the bearing part, and the connecting shaft 14; one end of the connecting shaft 14 is fixedly installed on the left side of the headstock 2, and the outside of the other end is installed through the bearing part Inside the bearing seat 11 , the bearing seat 11 is fixedly installed on the box body 1 .

Both the connecting shaft 14 and the central shaft 16 are hollow shafts, which can greatly reduce the weight of the overall equipment and reduce the energy consumed by the action. The rolling worm gear includes a worm wheel 17 and a worm 27. The worm wheel 17 and the central shaft 16 are arranged concentrically. The lower end of the worm 27 Engaged with the worm wheel 17, the driven pulley 29 is sleeved on the upper end of the worm wheel 17 through the driven pulley expansion sleeve 28. When the worm 27 rotates, it can drive the worm wheel 17 to rotate and then drive the central shaft 16 to rotate.

It should be noted that the axis of the worm 27 is arranged parallel to the axis of the output shaft of the servo motor 10, so that the entire structure can be arranged more compactly, and the radius of the driving pulley 31 is smaller than the radius of the driven pulley 29, so that the entire rotation speed is reduced. And increase the driving torque, the bearing part adopts double-row cylindrical roller bearing 13, the upper end of worm screw 27 is fixed on the front eccentric bearing seat 24 through angular contact ball bearing 25, and the lower end of worm screw 27 is fixed by double-row cylindrical roller bearing 35 On the rear eccentric bearing seat 34, the front eccentric bearing seat 24 and the rear eccentric bearing seat 34 are all fixed in the box body 1. Through the rotation of the front eccentric bearing seat 24 and the rear eccentric bearing seat 34, the relationship between the worm screw 27 and the worm wheel 17 can be adjusted. The relative position between them eliminates the backlash of the worm gear drive.

In this embodiment, the second swing mechanism 7 includes a pneumatic clamp 18, a wear ring 19 and a clamp mount 23, the pneumatic clamp 18 is fixed on the box body 1 through the clamp mount 23, and the pneumatic clamp 18 is controlled Under the control of the system, the wear ring 19 located on the central shaft 16 can be locked or released, so that the central shaft 16 can be locked and positioned or unlocked.

Example 2:

This embodiment is a preferred example of Embodiment 1.

This embodiment provides a machining center oscillating device suitable for difficult-to-machine materials, specifically a high-rigidity and high-torque horizontal five-axis machining center oscillating head, including a box body 1, a spindle box 2, and an auxiliary support mechanism 5 , the first swing mechanism 6, the second swing mechanism 7, the servo motor 10 and the end cover 4, as shown in Figure 1 and Figure 2, the auxiliary support mechanism 5 is arranged on the left side inner cavity of the casing 1; the first swing mechanism 6 , the second swing mechanism 7 and the servo motor 10 are arranged in the inner cavity on the right side of the box body 1; the spindle box 2 is arranged between the auxiliary supporting mechanism 5 and the second swing mechanism 7; the end cover 4 is arranged on the right side of the box body 1 The outer wall plays the role of protection and beauty.

As shown in Figure 3, the auxiliary support mechanism 5 is a bearing support seat, including a bearing seat 11, a bearing cover 12, a double-row cylindrical roller bearing 13, and a connecting shaft 14. The inner side of the connecting shaft 14 is fixedly connected to the left side of the main shaft box 2, The double-row cylindrical roller bearing 13 is set on the outside of the connecting shaft 14 and arranged inside the bearing seat 11. The bearing gland 12 is installed on the bearing seat 11 and is located outside the outer end of the double-row cylindrical roller bearing 13. For the double-row cylindrical roller bearing The roller bearing 13 plays a protective role, and the bearing seat 11 is fixedly connected with the box body 1 .

As shown in Figure 2 and Figure 4, the first swing mechanism 6 includes a driven pulley expansion sleeve 28, a driven pulley 29, a synchronous belt 30, a driving pulley 31, a driving pulley expansion sleeve 32, and an expansion sleeve gland 33 . The driving pulley 31 is connected with the rotating shaft of the servo motor through the driving pulley expansion sleeve 32, the expansion sleeve gland 33 compresses the driving pulley expansion sleeve 32, the driven pulley 29 is connected with the driving pulley 31 through the timing belt 30, and the driving pulley The radius of the pulley 31 is smaller than that of the driven pulley 29 , and the driven pulley expansion sleeve 28 is arranged inside the driven pulley 29 for connecting the driven pulley 29 and the worm shaft 27 .

The second swing mechanism 7 is a transmission structure of a rolling worm gear, including a central shaft 16, a YRT turntable bearing 15, a rolling worm gear, a front eccentric bearing seat 24, an angular contact ball bearing 25, a front bearing cover 26, and a rear eccentric bearing seat 34 , Double row cylindrical roller bearing 35, rear bearing gland 36. A YRT turntable bearing 15 is installed at the head of the central shaft 16, and the YRT turntable bearing 15 is fixed on the box body 1. The rolling worm gear includes a rolling worm wheel 17 and a worm 27. The worm wheel 17 is set in the middle of the central shaft 16, and the worm 27 meshes with the worm wheel 17 for transmission. , the upper end of the worm 27 is provided with an angular contact ball bearing 25, the outer ring of the angular contact ball bearing 25 is provided with a front eccentric bearing seat 24, the front eccentric bearing seat 24 is fixed in the box body 1, and the front bearing cover 26 is opposite to the outer ring of the angular contact ball bearing 25 For axial fixing, the lower end of the worm 27 is provided with a double-row cylindrical roller bearing 35, the outer ring of the double-row cylindrical roller bearing 35 is provided with a rear eccentric bearing seat 34, the rear eccentric bearing seat 34 is fixed in the box body 1, and the rear bearing gland 36 The outer ring of the double-row cylindrical roller bearing 35 is axially fixed.

In this embodiment, the second swing mechanism 7 further includes a wear ring 19 , a pneumatic clamp 18 , a clamp mounting seat 23 , an annular grating ruler 20 , a grating mounting plate 22 and a grating protective cover 21 . The wear-resistant ring 19 is fixed on the central shaft 16, the clamp mounting seat 23 is arranged on the side of the pneumatic clamp 18, and the clamp mounting seat 23 is fixed on the box body 1. The annular grating ruler 20 includes a grid hub and a reading head, and the grid hub and the center The shaft 16 is connected, the reading head is fixedly connected with the grating mounting plate 22 , the grating mounting plate 22 is fixed on the box body 1 , and the grating protective cover 21 is fixedly connected with the grating mounting plate 22 .

Specifically, the box 1 is used to place and protect the auxiliary support mechanism 5, the first swing mechanism 6, the second swing mechanism 7, and the rotating parts in the servo motor 10. The headstock 2 is used to install the high-speed electric spindle, and the motor is installed. The board is installed on the inner rear side of the box body 1, and is used to install the servo motor 10. The timing belt 30 connects the pulley on the servo motor 10 and the worm screw 27. After the timing belt 30 is connected, adjust the position of the motor mounting plate with the screw on the adjustment block, so that The synchronous belt 30 is tightened, and the rotation of the servo motor shaft is transmitted to the driven pulley 29 through the synchronous belt 30 to realize the first stage of deceleration. The large transmission ratio rolling worm gears in the second swing mechanism 7 mesh with each other for transmission, and the worm gear 17 drives the central shaft 16 to rotate to realize the second stage of deceleration, and the two decelerations greatly increase the transmission torque. The central shaft 16 is connected with the spindle box 2 with screws, thereby driving the spindle box 2 to swing. The YRT turntable bearing 15 on the left side of the headstock 2 bears radial force and axial force, and the double-row cylindrical roller bearing 35 on the right side bears the radial force, thus providing a stable axis of rotation for the headstock 2 and improving the swing head rigidity.

The pneumatic clamp 18 is used to lock the rotation of the central shaft 16, so as to ensure the precision of the fixed angle machining of the swing head. The wear-resistant ring 19 is connected to the central shaft 16 by screws, and the pneumatic clamp 18 is fixed on the clamp mounting base 23, and the positions of the two correspond. When the pneumatic clamp 18 is ventilated, the inner ring will be locked with the wear-resistant ring 19, thereby Lock the central shaft 16.

The ring grating ruler 20 is used to ensure the accuracy of the swing angle of the swing head box, detect the swing angle position of the spindle box 2 in real time, and the data collected by the ring grating ruler 20 is fed back to the control system, and the control system performs position compensation for the position with errors, thus forming The closed-loop control of the rotation position of the swing head improves the swing precision of the swing head.

The swing principle of the present invention is as follows:

The control system controls the rotation of the servo motor 10 after receiving the rotation command, the driving pulley 31 assembled on the output shaft of the servo motor 10 rotates and drives the driven pulley 29 to rotate through the synchronous belt 30, and then drives the worm 27 to rotate, and the worm gear 17 and the worm 27 meshes, so the worm wheel 17 also rotates following the rotation of the worm screw 27, and the worm wheel 17 is fixedly assembled with the central shaft 16, so the central shaft 16 also rotates with the worm wheel 17 and drives the headstock 2 to also rotate so that the orientation of the electric spindle 3 is rotated At this time, the control system compares the position data collected by the ring scale 20 installed on the second swing mechanism 7 with the target position. When the comparison result does not match the target position, the control system sends a control Command and drive the servo motor 10 to act and correct the predetermined position until the predetermined position reaches the target position or is within the range of the target position, so as to achieve the purpose of high-precision machining.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (10)

1. A machining center swinging device suitable for difficult-to-machine materials, characterized in that it includes: The box body (1) is used for supporting; Spindle box (2), the left side is in rotation with the auxiliary supporting mechanism (5) installed on the box body (1), and the right side is connected with the second swing mechanism (7) installed on the box body (1) drive connection; The first swing mechanism (6) can rotate under the drive of the power source and can drive the second swing mechanism (7) to rotate so as to realize the swing of the headstock (2) and stop at a predetermined position; The control system receives the position data collected by the acquisition unit of the second swing mechanism (7) and drives the power source to correct the predetermined position until the predetermined position reaches the target position or is within the range of the target position. 2. The machining center oscillating device suitable for difficult-to-machine materials according to claim 1, characterized in that, the first oscillating mechanism (6) is driven by the power source through the synchronous belt (30) and the first oscillating device. Two swing mechanisms (7) are driven and connected. 3. The machining center swing head device suitable for difficult-to-machine materials according to claim 2, characterized in that, the power source adopts a servo motor (10), and the first swing mechanism (6) includes a driven pulley Expansion sleeve (28), driven pulley (29), timing belt (30), driving pulley (31) and driving pulley expansion sleeve (32); The second swing mechanism (7) includes a central shaft (16) and a rolling worm gear. The driving pulley (31) is sleeved on the output shaft of the servo motor (10) through a driving pulley expansion sleeve (32). The driven pulley (29) is set on the input end of the rolling worm gear through the driven pulley expansion sleeve (28), and the output end of the rolling worm gear is connected to the central shaft (16). When the servo The motor (10) can drive the driving pulley (31) to rotate and drive the rolling worm gear to run through the synchronous belt (30) so as to rotate the central shaft (16); The central shaft (16) is fixedly installed on the right side of the headstock (2). 4. The machining center oscillating device suitable for difficult-to-machine materials according to claim 3, characterized in that, the auxiliary support mechanism (5) includes a bearing seat (11), a bearing member, and a connecting shaft (14); One end of the connecting shaft (14) is fixedly installed on the left side of the headstock (2), and the outside of the other end is installed inside the bearing seat (11) through a bearing, and the bearing seat (11) is fixedly installed on the on the box (1). 5. The machining center swing head device suitable for difficult-to-machine materials according to claim 4, characterized in that, both the connecting shaft (14) and the central shaft (16) are hollow shafts. 6. The machining center oscillating device suitable for difficult-to-machine materials according to claim 4, characterized in that, the rolling worm gear comprises a worm wheel (17) and a worm (27), and the worm wheel (17) and the central shaft (16) Arranged concentrically, the lower end of the worm (27) is engaged with the worm wheel (17), and the driven pulley (29) is sleeved on the upper end of the worm wheel (17) through the driven pulley expansion sleeve (28) . 7. The machining center oscillating device suitable for difficult-to-machine materials according to claim 6, characterized in that, the bearing part adopts a double-row cylindrical roller bearing (13); The upper end of the worm (27) is fixed on the front eccentric bearing seat (24) through an angular contact ball bearing (25), and the lower end of the worm (27) is fixed on the rear eccentric bearing through a double-row cylindrical roller bearing (35). On the seat (34), the front eccentric bearing seat (24) and the rear eccentric bearing seat (34) are all fixed in the casing (1). 8. The head oscillating device of a machining center suitable for difficult-to-machine materials according to claim 6, characterized in that the axis of the worm (27) is arranged parallel to the axis of the output shaft of the servo motor (10). 9. The head oscillating device of a machining center suitable for difficult-to-machine materials according to claim 6, characterized in that the radius of the driving pulley (31) is smaller than the radius of the driven pulley (29). 10. The machining center oscillating device suitable for difficult-to-machine materials according to claim 1, characterized in that, the second oscillating mechanism (7) includes pneumatic clamps (18), wear-resistant rings (19) and clips Clamp mount (23); The pneumatic clamp (18) is fixed on the box body (1) through the clamp mounting base (23), and the pneumatic clamp (18) can be locked or released on the central axis (16) under the control of the control system. ) on the wear ring (19) and then can realize the locked positioning state or the unlocked state of the central shaft (16).

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