Reliability test bench for AC double-swing milling head with mixed dynamic force and torque loading

Abstract

The invention discloses an AC double-swing angle milling head reliability test bench with mixed loading of dynamic force and torque, which belongs to the field of reliability testing of machine tool components. The test bench comprises: a test bench base, a milling head supporting mechanism, an X-direction dynamic force loading device, a Y-direction dynamic force loading device, a Z-direction dynamic force loading device, a tested AC double-swing angle milling head, a transmission device, and a dynamometer. The test bench can simulate the dynamic cutting force and torque borne by the AC double-swing angle milling head in an actual machining process, and respectively uses a piezoelectric ceramic driver to realize simulated loading of dynamic forces in three directions of X, Y, and Z, and can achieve a higher dynamic force frequency to meet the needs of simulating cutting forces and frequencies of various different machining methods. At the same time, a dynamometer is used to load torque on the tested AC double-swing angle milling head, which well restores different types of force conditions of the tested AC double-swing angle milling head in mechanical machining, thereby making the test data obtained in further research more real and reliable.

Description

Technical Field

[0001] The invention belongs to the field of reliability testing of machine tool components, and in particular relates to an AC double-swing angle milling head reliability test bench with mixed loading of dynamic force and torque. Background Art

[0002] Compared with traditional three-axis CNC machine tools, the five-axis linkage machining center has the irreplaceable advantages of saving time, high machining accuracy, complex shape processing, and high productivity because it has an AC double-swing milling head, which can realize one-time clamping and complete complex parts processing. However, the domestic AC double-swing milling head has only achieved functional possibilities and has not yet achieved reliable performance. Although some gratifying results have been obtained in the early domestic research on the reliability of five-axis machining centers, there are very few studies on reliability test equipment. At present, only reliability test benches have been developed for key functional components such as the spindle, tool magazine, and linear guide rails of the five-axis machining center. However, a reliability test bench for AC double-swing milling heads that can simulate actual working conditions has not yet been developed. In order to carry out reliability tests on domestic AC double-swing milling heads, the reliability level of domestic AC double-swing milling heads can be accurately evaluated and verified. The design of a reliability test bench for AC double-swing milling heads in five-axis machining centers has important practical application value.

[0003] Reliability testing needs to follow two principles: not changing the failure mode and failure mechanism. Therefore, it is necessary to carry out reliability testing of AC double-swing milling heads that simulate actual working conditions. However, at present, the service load of AC double-swing milling heads is more complex than that of CNC machine tool spindles. It has multi- / high-dimensional, high-speed, precise, dynamic and other characteristics, and it is extremely difficult to simulate actual working conditions. At present, there is no reliability test bench in China that can simulate its actual working conditions. Fault stimulation and reliability testing can only rely on inefficient and long-term user on-site tracking, which cannot meet the reliability technology requirements under the trend of faster and faster product update cycles. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and to provide a reliability test bench for a five-axis machining center AC double-swing milling head with mixed loading of dynamic force and dynamic torque.

[0005] An AC double-swing milling head reliability test bench with mixed dynamic force and torque loading includes: a test bench base 100, a milling head support mechanism 200, an X-direction dynamic force loading device 600, a Y-direction dynamic force loading device 500, a Z-direction dynamic force loading device 300, a tested AC double-swing milling head 400, a transmission device 700, and a dynamometer 800;

[0006] The test bench base 100 is provided with a ground iron 103 on the top, and a T-shaped slot parallel to the Y-axis is provided in the middle of the ground iron 103; the X-direction dynamic force loading device 600, the Y-direction dynamic force loading device 500, and the Z-direction dynamic force loading device 300 are all provided with bosses matching the T-shaped slot of the ground iron 103 at the bottom, and the three are fixedly connected to the ground iron 103 in a movable position;

[0007] The transmission device 700 and the dynamometer 800 are fixedly connected to the ground iron 103; the milling head support mechanism 200 is a gantry structure, and its two ends are fixedly connected to the two sides of the ground iron 103; the tested AC double swing angle milling head 400 is fixed on the crossbeam A 203 of the milling head support mechanism 200;

[0008] The tested AC double-swing milling head 400 is composed of a milling head body and a test shaft 402, and the top of the test shaft 402 is connected to the bottom of the spindle motor of the milling head body through a pin;

[0009] The bottom of the test shaft 402 is fixedly connected to the transmission shaft II 719 or the transmission shaft V 722 of the transmission device 700, and the two transmission shafts are arranged vertically; the transmission shaft I 716 of the transmission device 700 is fixedly connected to the output shaft of the dynamometer 800 at the input end to apply dynamic torque to the tested AC double-swing angle milling head 400; the loading heads of the dynamic force loading devices of the X-direction dynamic force loading device 600, the Y-direction dynamic force loading device 500, and the Z-direction dynamic force loading device 300 simultaneously act on the force-bearing structure in the middle of the test shaft 402, providing dynamic forces in three directions of X, Y, and Z for the test shaft 402;

[0010] The test shaft 402 of the tested AC double-swing milling head 400 comprises: a test shaft end cover 402-1, a test shaft housing 402-2, a bearing 402-3, a test shaft body 402-4 and a collar 402-5, wherein the middle shaft section of the test shaft body 402-4 is provided with a collar 402-5 for two bearings 402-3; a test shaft end cover 402-1 is provided on the outer side of the bearing, which is fixedly connected to the test shaft housing 402-2; the four surfaces of the test shaft housing 402-2 are projected into a rectangular shape, each of which has a boss in the middle of the surface, and a hemispherical groove is opened in the center of the boss for positioning the loading head in the dynamic force loading device B 510 and the dynamic force loading device C604; there are two bosses on the test shaft end cover 402-1 for positioning the loading head in the dynamic force loading device A The lever mechanism in 303 is positioned; the test shaft body 402-4 is connected to the transmission shaft II 719 or the transmission shaft V 722 of the transmission device 700 through the protrusion at the bottom;

[0011] The described milling head support mechanism 200 includes: a base B 201, a column 202, a crossbeam A 203, a milling head X-direction moving member 204, and a milling head Z-direction moving member 205. The base B 201, the column 202, and the crossbeam A 203 are fixedly connected to form a gantry structure, leaving space for the installation and movement of the tested AC double swing angle milling head 400. There is a slider rail between the base B 201 and the floor iron 103 of the test bench base 100, and they slide relative to each other along the Y-axis. A motor-driven ball screw mechanism A parallel to the Y-axis is provided on the lower side of the floor iron 103. The ball screw mechanism A can drive the support mechanism connecting plate 102 in the shape of a "冖" passing through the lower side of the floor iron 103 to move along the Y-axis. The outer sides of the left and right columns 202 are fixedly connected to the protruding structures at both ends of the support mechanism connecting plate 102. There are guide rails and sliders in the X-axis direction and a motor-driven ball screw mechanism B between the "concave"-shaped milling head X-direction moving member 204 and the crossbeam A 203. The milling head Z-direction moving member 205 is arranged inside the "concave" shape of the milling head X-direction moving member 204, and there are guide rails and sliders in the Z-axis direction and a motor-driven ball screw mechanism C between them. The bottom surface of the milling head Z-direction moving member 205 is connected to the milling head body in the tested AC double swing angle milling head 400 by bolts. The milling head support mechanism 200 can provide free movement of the tested AC double swing angle milling head 400 in three directions of X, Y, and Z, and the tested AC double swing angle milling head 400 itself can rotate around the A-axis and the C-axis;

[0012] The described X-direction dynamic force loading device 600 includes: a base E 601, a "concave"-shaped column C 603, a dynamic force loading device C 604, a slider 605, a sliding seat 606, a right-angle fixing plate 607, a connecting plate B 608, a connecting block 610, a linear stepping motor fixing seat 611, a lead screw shaft 612, and a linear stepping motor 613, where: The base E 601 is provided on the lower side of the X-direction dynamic force loading device 600, and it is fixedly connected to the floor iron 103 in a position that can move along the Y-axis; both sides of the "concave"-shaped column C 603 and the inner side of the "冖"-shaped connecting plate B 608 are respectively connected through a slider rail and a ball screw mechanism F driven by a motor, and the "冖"-shaped connecting plate B 608 can move along the Z-axis; Two symmetrically arranged right-angle fixing plates 607 are symmetrically fixed at the front end of the connecting plate B 608, and the sliding seat 606 is fixedly connected to the right-angle fixing plate 607, providing support and a sliding track for the dynamic force loading device C 604 that fixes the slider 605 up and down; A linear stepping motor fixing seat 611 is fixedly connected to the side of the connecting plate B 608, and the linear stepping motor 613 is fixed thereon; A lead screw shaft 612 is installed at the center of the linear stepping motor 613, and one side of the lead screw shaft 612 is connected to the dynamic force loading device C 604 through a connecting block 610, directly providing axial movement and positioning for the dynamic force loading device C 604; The loading head of the dynamic force loading device C 604 cooperates with the protruding part of the outer shell of the test shaft 402 in the tested AC double swing angle milling head 400;

[0013] The Y-direction dynamic force loading device 500 includes: a base D 501, a "concave"-shaped column B 502, a fixed shaft B 503, a guide rail slider C 504, a linear guide rail C 505, a cross beam B 506, a moment balance plate 507, a fixed plate 508, a rotating beam 509, a dynamic force loading device B 510, and a moving plate 511, where: the base D 501 and the "concave"-shaped column B 502 on both sides form a gantry structure with the cross beam B 506; the base D 501 is provided on the lower side of the Y-direction dynamic force loading device 500, and it is fixedly connected to the floor iron 103 in a position that can move along the Y-axis; the "concave"-shaped column B 502 and the cross beam B 506 are connected by a slider rail and a ball screw mechanism E driven by a motor, and the cross beam B 506 can move along the Z-axis; the fixed plate 508 is connected to the cross beam B 506, and the fixed plate 508 is a "冖"-shaped structural member, and two arc holes that are centrosymmetric at 90° are opened at the protruding parts at both ends, and a circular through hole is opened in the center; the fixed shaft B 503 is positioned by the hole and connected to the fixed plate 508 by screws, the rotating beam 509 is arranged between the left and right fixed shafts B 503, and the rotating beam 509 can rotate and can be fixed by bolts at any time between 0° and 90°; the moving plate 511 is arranged on the upper part of the rotating beam 509, and the two are slidably connected; the dynamic force loading device B 510 is fixedly connected to the upper side of the moving plate 511; the loading head of the dynamic force loading device B 510 cooperates with another protruding part on the outer shell of the test shaft 402 in the tested AC double swing angle milling head 400, and the protruding part on the outer shell of the test shaft 402 is in two different mutually perpendicular planes;

[0014] The Z-direction dynamic force loading device 300 includes a base C 301, a "concave"-shaped column A 302, a dynamic force loading device A 303, a movable disc 304, a rotating seat 305, and a connecting plate A 308. The base C 301 is provided on the lower side of the Z-direction dynamic force loading device 300, and it is fixedly connected to the floor iron 103 in a position that can move along the Y-axis; both sides of the "concave"-shaped column A 302 and the inner side of the "冖"-shaped connecting plate A 308 are respectively connected by a slider rail and a ball screw mechanism D driven by a motor, and the "冖"-shaped connecting plate A 308 can move along the Z-axis; the rotating seat 305 is connected to the connecting plate 308 by bolts. Two arc holes that are centrosymmetric at 90° are opened at the front end of the rotating seat 305. At the same time, a circular hole is opened at the center of the front end of the rotating seat 305. The fixed shaft A is positioned by the hole and connected to the rotating seat 305 by screws. The movable disc 304 is installed on the fixed shaft A and can rotate freely, and can be fixed at any time between 0° and 90° by bolts; the dynamic force loading device A 303 is fixed on the movable disc 304, and its loading head is a lever mechanism; the lever mechanism loading head of the dynamic force loading device A 303 cooperates with the protruding part on the outer side of the end cover of the test shaft 402 in the tested AC double swing angle milling head 400;

[0015] The transmission device 700 comprises: a supporting shell, a transmission shaft I 716, a transmission shaft II 719, a transmission shaft III 711, a transmission shaft IV 729, and a transmission shaft V 722, wherein bearings and end covers are provided at the connection between the transmission shaft and the supporting shell; one end of the transmission shaft I 716 is transmission-connected with the transmission shaft III 711, and the axes of the two are parallel to the Y axis; the other end of the transmission shaft I 716 is transmission-connected with the output shaft of the dynamometer 800; the middle part of the transmission shaft I 716 transmits power upward to the transmission shaft II 719 arranged in the Z axis direction through mutually meshing spur gears; the middle part of the transmission shaft III 711 is provided with a spur gear, and the power is transmitted to the transmission shaft V 722 arranged in the Y axis direction and provided with a spur gear in the middle part through the transmission shaft IV 729 provided with spur gears at both ends; the transmission shaft II 719 or the transmission shaft V 722 is a torque loading output shaft of the transmission mechanism.

[0016] The dynamic force loading device A 303, the dynamic force loading device B 510 and the dynamic force loading device C 604 are all provided with force sensing devices for detecting the magnitude and frequency changes of the output force, and the dynamometer 800 is provided with a speed sensor and a torque sensor for detecting the magnitude changes of the torque and the speed;

[0017] The transmission device has a support platform 701 at the bottom, and a threaded hole is opened on the upper end surface of the support platform 701, which is connected to the bottom protruding part of the lower housing 702 of the transmission shaft I through a bolt. The upper housing 703 of the transmission shaft I cooperates with the protruding part of the upper part of the lower housing 702 of the transmission shaft I through the hole of the lower end protruding part to form a whole. The bottom protruding part of the lower housing 704 of the transmission shaft II is connected to the upper housing 703 of the transmission shaft I, and the upper housing 705 of the transmission shaft II cooperates with the protruding part of the upper part of the lower housing 704 of the transmission shaft II through the hole of the lower end protruding part to form a whole. The protruding part of the bottom of the lower housing 708 of the transmission shaft III is connected to the support platform 701, and the protruding part of the upper part is connected to the bottom protruding part of the intermediate housing 707. The bottom protruding part of the upper housing 706 of the transmission shaft V is connected to the upper protruding part of the intermediate housing 707. The internal structure of the transmission device 700 is as follows: the left and right ends of the transmission shaft I 716 are respectively installed with the transmission shaft I bearing 714 and the transmission shaft I end cover 713, the transmission shaft I end cover 713 is connected to the housing by bolts, there is a straight bevel gear I 717 in the middle of the transmission shaft I 716 that is keyed to cooperate with the transmission shaft I 716, and the ends of the transmission shaft I 716 that exceed the transmission shaft I end cover 713 have couplings I 715 and couplings II 712 that are concentrically matched with it. The upper and lower ends of the transmission shaft II 719 are respectively installed with the transmission shaft II bearing 720 and the transmission shaft II end cover 721, the transmission shaft II end cover 721 is connected to the housing by bolts, and the straight bevel gear II 718 in the lower part of the transmission shaft II 719 that exceeds the end cover is concentrically matched with the transmission shaft II 719 and is meshed with the straight bevel gear I 717. The transmission shaft III 711 is respectively provided with a transmission shaft III bearing 709 and a transmission shaft III end cover 733 at the left and right ends. The transmission shaft III end cover 733 is connected to the housing by bolts. There is a spur bevel gear III 710 in the middle that is matched with the transmission shaft III 711 by key connection. The portion of the transmission shaft III 711 that exceeds the end cover is connected to the transmission shaft I 716 through a coupling II 712. The transmission shaft IV 729 is respectively provided with a transmission shaft IV bearing 730 and a transmission shaft IV end cover 731 at the upper and lower ends. The transmission shaft IV end cover 731 is connected to the transmission shaft IV housing 728 by bolts. The transmission shaft IV housing 728 is connected to the internal platform of the intermediate housing 707 through the protruding portion at the bottom. The spur bevel gear IV-1.727 and the spur bevel gear IV-2.732 that exceed the end cover at the upper and lower ends of the transmission shaft IV 729 are concentrically matched and expanded with the transmission shaft IV 729, and are respectively meshed with the spur bevel gear V 723 and the spur bevel gear III 710. The left and right ends of the transmission shaft V 722 are respectively installed with a transmission shaft V bearing 725 and a transmission shaft V end cover 726. The transmission shaft V end cover 726 is connected to the housing through bolts. In the middle, there is a straight bevel gear V 723 connected to the transmission shaft V 722 through a connecting key 724.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The AC double-swing angle milling head reliability test bench with mixed loading of dynamic force and torque described in the present invention can simulate the dynamic cutting force and torque that the AC double-swing angle milling head is borne in the actual machining process; wherein, the dynamic cutting force is divided into dynamic forces in three directions of X, Y, and Z, and piezoelectric ceramic drivers are used to realize the simulated loading of the dynamic forces in the three directions of X, Y, and Z, respectively, which can achieve a higher dynamic force frequency and meet the simulation of the cutting force and frequency of various machining methods. At the same time, a dynamometer is used to load the torque of the tested AC double-swing angle milling head, which well restores the different types of force conditions of the tested AC double-swing angle milling head in mechanical machining, thereby making the test data obtained in further research more real and reliable.

[0020] 2. The present invention utilizes a combination of a dynamometer and a transmission device to apply a torque of variable size and frequency to the bottom end of the test shaft; and through the linkage of the transmission shaft in the transmission device, the spatial direction of the torque is changed; at the same time, through the linkage of the three-directional force loading device and the transmission device, the simulation of the actual working conditions when the swing angle of the AC double-swing angle milling head is at 0° and 90° can be realized.

[0021] 3. The AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading described in the present invention includes: a dynamometer, a dynamic force loading device, a transmission device and a milling head support mechanism. These components can be modularly combined according to the needs of the test, and do not need to be fixed on the base normally, which is conducive to saving space.

[0022] 4. The various parts of the base of the test bench described in the present invention can be adjusted in position and height, so that the test bench can perform loading tests on AC double-swing angle milling heads of different specifications and models, thereby increasing the applicability and flexibility of the test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the test bench base of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the milling head support mechanism of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the Z-direction dynamic force loading device of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0027] Figure 5 It is a schematic diagram of the explosion structure of the test shaft of the AC double-swing angle milling head under test in the AC double-swing angle milling head reliability test bench with mixed loading of dynamic force and torque of the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the Y-axis dynamic force loading device of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0029] Figure 7 It is a schematic diagram of the three-dimensional structure of the X-axis dynamic force loading device of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the transmission device of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0031] Fig. 9 It is a schematic diagram of the specific internal structure of the transmission device of the AC double-swing angle milling head reliability test bench with dynamic force and torque mixed loading of the present invention;

[0032] Fig.10 It is a loading condition state diagram of the AC double-swing milling head reliability test bench with dynamic and torque mixed loading of the present invention when the swing angle of the tested milling head is 0°;

[0033] Fig.11 This is a loading condition state diagram of the AC double-swing milling head reliability test bench with mixed dynamic force and torque loading when the swing angle of the tested milling head is 90°.

[0034] In the attached picture:

[0035] 100, test bench base; 200, milling head support mechanism; 300, Z-direction dynamic force loading device; 400, tested AC double-swing milling head; 500, Y-direction dynamic force loading device; 600, X-direction dynamic force loading device; 700, transmission device; 800, dynamometer; 101, base A; 102, support mechanism connecting plate; 103, ground level iron; 104, linear guide rail A; 105, guide rail slider A; 201, base B; 202, column; 203, crossbeam A; 204, milling head X-direction moving part; 205, milling head Z-direction moving part; 301, base C; 302, "concave" column A; 303, dynamic force loading device A; 304, movable Disk; 305, rotating seat; 306, linear guide B; 307, guide slider B; 308, connecting plate A; 402, test shaft; 402-1, test shaft end cover; 402-2, test shaft housing; 402-3, bearing; 402-4, test shaft body; 402-5, shaft ring; 501, base D; 502, "concave" column B; 503, fixed shaft B; 504, guide slider C; 505, linear guide C; 506, beam B; 507, torque balance plate; 508, fixed plate; 509, rotating beam; 510, dynamic force loading device B; 511, moving plate; 601, base E; 602, linear guide D; 603, "Concave" column C; 604, dynamic force loading device C; 605, slider; 606, sliding seat; 607, right angle fixing plate; 608, connecting plate B; 609, guide slider D; 610, connecting block; 611, linear stepper motor fixing seat; 612, screw shaft; 613, linear stepper motor; 701, support platform; 702, transmission shaft I lower housing; 703, transmission shaft I upper housing; 704, transmission shaft II lower housing; 705, transmission shaft II upper housing; 706, transmission shaft V upper housing; 707, intermediate housing; 708, transmission shaft III lower housing; 709, transmission shaft III bearing; 710, spur bevel gear III; 711, transmission shaft III; 71 2. Coupling II; 713. Transmission shaft I end cover; 714. Transmission shaft I bearing; 715. Coupling I; 716. Transmission shaft I; 717. Spur bevel gear I; 718. Spur bevel gear II; 719. Transmission shaft II; 720. Transmission shaft II bearing; 721. Transmission shaft II end cover; 722. Transmission shaft V; 723. Spur bevel gear V; 724. Connecting key; 725. Transmission shaft V bearing; 726. Transmission shaft V end cover; 727. Spur bevel gear IV-1; 728. Transmission shaft IV housing; 729. Transmission shaft IV; 730. Transmission shaft IV bearing; 731. Transmission shaft IV end cover; 732. Spur bevel gear IV-2; 733. Transmission shaft II end cover. DETAILED DESCRIPTION

[0036] See attached Figure 1The present invention provides an AC double-swing milling head reliability test bench with mixed dynamic force and torque loading, comprising: a test bench base 100, a milling head support mechanism 200, an X-axis dynamic force loading device 600, a Y-axis dynamic force loading device 500, a Z-axis dynamic force loading device 300, a tested AC double-swing milling head 400, a transmission device 700, and a dynamometer 800, wherein: the test bench base 100 is located at the bottom of the entire test bench distribution, and the milling head support mechanism 200 is connected to the test bench base 100 by bolts.

[0037] The boss of the base E 601 in the X-axis dynamic force loading device 600 cooperates with the T-slot of the ground iron 103 in the test bench base 100; the base E 601 can move freely along the direction of the T-slot and is fixed at a certain position on the left side by bolts; the loading head of the dynamic force loading device C 604 in the X-axis dynamic force loading device 600 cooperates with the raised part of the outer shell of the test shaft 402 in the tested AC double-swing milling head 400.

[0038] The bosses of the two bases D 501 of the Y-axis dynamic force loading device 500 are both matched with the T-slots of the ground iron 103 in the test bench base 100; the two bases D 501 can move freely along the direction of the T-slots and are fixed by bolts; the loading head of the dynamic force loading device B 510 of the Y-axis dynamic force loading device 500 is matched with the raised part on the outer shell of the test shaft 402 in the tested AC double-swing milling head 400.

[0039] The boss of the base C 301 of the Z-direction dynamic force loading device 300 cooperates with the T-slot of the ground iron 103 in the test bench base 100; the base C 301 can move freely along the direction of the T-slot and is fixed at a certain position on the right side by bolts; the lever mechanism loading head of the dynamic force loading device A of the Z-direction dynamic force loading device 300 cooperates with the raised part on the outer side of the end cover of the test shaft 402 in the tested AC double-swing angle milling head 400.

[0040] The bottoms of the transmission device 700 and the dynamometer 800 are positioned through grooves and connected to the test bench base 100 through bolts; the output end of the dynamometer 800 is expansion-connected to the front end of the transmission device 700 through a coupling I 715; the output end of the dynamometer 800, the coupling I 715 and the rotation axes of the transmission shaft I 716 and the transmission shaft III 711 in the transmission mechanism are on the same horizontal line; the upper end of the tested AC double-swing milling head 400 is fixedly connected to the milling head support mechanism 200 by bolts; the test shaft 402 of the tested AC double-swing milling head 400 is fixed to the transmission shaft II 719 or the transmission shaft V 722 exposed at the upper end of the transmission device by mortise and tenon connection.

[0041] See attached Figure 1 and Figure 2 The test bench base 100 includes: base A 101, support mechanism connecting plate 102, surface plate 103, linear guide rail A 104, guide rail slider A 105, etc. The surface plate 103 is fixed on the base 101 by bolts distributed at the four corners, and is used to install the main mechanisms of the test bench other than the milling head support mechanism 200. The upper end surface of the surface plate 103 is evenly provided with T-shaped grooves, which are used to guide the axial movement of these mechanisms and devices. Linear guide rails A 104 are symmetrically installed on both sides of the surface plate 103 by bolts, and guide rail sliders A 105 are installed on the rails. The linear guide rail A 104 and the guide rail slider A 105 form a linear guide system. The guide rail sliders A 105 on both sides are fixedly connected to the lower part of the support mechanism 200, and are used to guide the movement of the milling head support mechanism 200 in the Y-axis direction and support its weight. A ball screw mechanism A with a stepper motor A is installed on the groove bottom surface of the base A 101 by bolts.

[0042] The support mechanism connecting plate 102 is a "冖"-shaped structural member. Threaded holes are provided between the outer end surfaces of the two protruding parts on both sides of the support mechanism connecting plate 102 and the inner end surface in the middle. The middle section of the support mechanism connecting plate 102 passes through the gap between the base 101 and the surface plate 103 and is fixed on the bearing block of the ball screw mechanism by bolts. The two sides of the support mechanism connecting plate 102 are connected to the two side columns 202 of the milling head support mechanism 200 by bolts. The structure composed of the support mechanism connecting plate 102, the ball screw mechanism and the stepper motor provides precise movement for the milling head support mechanism 200 along the direction of the groove on the surface plate 103.

[0043] See the appendix Figure 1 and Figure 3 The milling head support mechanism 200 includes: base B 201, columns 202, cross beam A 203, milling head X-direction moving part 204, milling head Z-direction moving part 205, etc. The base B 201, columns 202 and cross beam A 203 are connected to each other by screws to form a structure similar to a gantry, leaving space for the installation and movement of the tested AC double swing angle milling head 400. The base B 201 is fixed on the guide rail slider A 105 by bolts. Six threaded holes are provided on the outer sides of the left and right columns 202, which are concentrically matched with the counterbored holes at the two protruding ends of the support mechanism connecting plate 102 and are fixedly connected by screws. A ball screw mechanism B with a stepper motor B is installed on the groove bottom surface of the cross beam A 203 by bolts. Linear guide rails B are symmetrically installed at the upper and lower ends of the groove bottom surface by bolts, and guide rail sliders B 307 are installed on the linear guide rails B.

[0044] The milling head X-direction moving part 204 is connected to the guide rail slider B 307 and the bearing block in the ball screw mechanism B by screws, providing the tested milling head with precise movement perpendicular to the grooving direction of the horizontal iron 103; the milling head X-direction moving part 204 is a "concave" structural part; the bottom surface of the "concave" inner side of the milling head X-direction moving part 204 and its upper end surface are fixed with a ball screw mechanism C with a stepping motor C by bolts; the left and right side surfaces of the "concave" inner side of the milling head X-direction moving part 204 are installed with linear guide rails C, and guide rail sliders C 504 are installed on the guide rails; the milling head Z-direction moving part 205 is connected to the guide rail slider C 504 and the bearing block in the ball screw mechanism C by screws, providing the tested milling head with precise movement perpendicular to the horizontal iron direction; the bottom surface of the milling head Z-direction moving part 205 is connected to the milling head body in the tested AC double-swing angle milling head 400 by bolts.

[0045] In summary, the milling head support mechanism 200 can provide the tested AC double-swing milling head 400 with free movement in three directions of X, Y and Z; the tested AC double-swing milling head 400 itself can rotate around the A-axis and the C-axis, thereby improving the flexibility of the test bench; when necessary, the milling head Z-direction moving part 205 with different inner diameters can be replaced and the position adjusted, thereby adapting to different models of tested AC double-swing milling heads 400, thereby increasing the versatility of the reliability test bench for the AC double-swing milling head of the five-axis machining center of the present invention.

[0046] See also Figure 1 and Figure 7 The X-direction dynamic force loading device 600 includes: a base E 601, a linear guide D 602, a concave column C 603, a dynamic force loading device C 604, a slider 605, a sliding seat 606, a right-angle fixing plate 607, a connecting plate B608, a guide slider D 609, a connecting block 610, a linear stepping motor fixing seat 611, a screw shaft 612 and a linear stepping motor 613, etc.; the base E 601 moves along the groove direction on the ground iron 103 through the boss on the bottom surface, and is fixed to the ground iron 103 by bolts; the concave column C 603 is connected to the base E 601 by bolts; a small groove is opened on the concave outer front end surface of the concave column C 603 for guiding the installation of the linear guide D 602; a freely movable guide slider D is installed on the linear guide D 602 609; A ball screw mechanism F with a stepper motor F is installed on the inner side of the "concave" shape of the "concave" column C 603.

[0047] The described connecting plate B 608 is a "冖"-shaped structural member; the connecting plate B 608 is connected to both the guide rail slider D 609 and the bearing block in the ball screw mechanism F by screws, providing precise height adjustment for the dynamic force loading device C 604; two right-angle fixing plates 607 are symmetrically mounted up and down at the front end of the connecting plate B 608 using bolts; the sliding seat 606 is connected to the right-angle fixing plate 607 using bolts, and the structure formed by the right-angle fixing plate 607 and the sliding seat 606 can provide support and a sliding track for the dynamic force loading device C 604 with the slider 605 fixed up and down; a linear stepper motor fixing seat 611 is fixed to the side of the connecting plate B 608 using bolts; the linear stepper motor 613 is fixed to the linear stepper motor fixing seat 611 by screws, a lead screw shaft 612 is installed at the center of the linear stepper motor 613, and one side of the lead screw shaft 612 is directly connected to the dynamic force loading device C 604 through a connecting block 610, directly providing axial movement and positioning for the dynamic force loading device C 604. In summary, the X-direction dynamic force loading device can provide an X-direction dynamic force for the test shaft 402 of the tested AC double swing angle milling head 400.

[0048] See attachment Figure 1 and Figure 6 As shown in FIGS. and, the described Y-direction dynamic force loading device 500 includes: a base D 501, a "concave"-shaped column B 502, a fixed shaft B 503, a guide rail slider C 504, a linear guide rail C 505, a cross beam B 506, a fixing plate 508, a moment balance plate 507, a rotating beam 509, a dynamic force loading device B 510, a moving plate 511, etc. The base D 501, the "concave"-shaped column B 502, and the cross beam B 506 are connected to each other by screws to form a structure similar to a gantry; the base D 501 moves axially along the groove direction on the floor iron 103 through the T-shaped boss on the bottom surface and is fixed to the floor iron 103 by bolts; a small groove for guiding the installation of the linear guide rail C 505 is opened on the outer right end surface of the "concave"-shaped column B 502; the linear guide rail C 505 is fixed to the "concave"-shaped column B 502 by bolts; a guide rail slider C 504 that can move freely along the guide rail is installed on the linear guide rail C 505; a ball screw mechanism E with a stepper motor E is fixed to the bottom surface of the "concave" inner side of the "concave"-shaped column B 502 using bolts; the cross beam B 506 is connected to both the guide rail slider C 504 and the bearing block in the ball screw mechanism E by screws, the stepper motor E provides power, and the ball screw mechanism E drives the cross beam B 506 to slide on the linear guide rail C 505, providing precise height adjustment for the dynamic force loading device B 510; the fixing plate 508 is connected to the cross beam B 506 by screws to balance the moment of the entire dynamic force loading device and prevent component aging caused by stress concentration.

[0049] The fixed plate 508 is a "冖"-shaped structural member. The middle part of the moment balance plate 507 is fixedly connected to the bottom end face of the cross beam B 506 by bolts. The protruding parts at both ends of the fixed plate 508 are provided with two arc holes that are centrosymmetric at 90°, and a circular through hole is provided in the center. The fixed shaft B 503 is positioned by the hole and connected to the fixed plate 508 by screws, providing support for the rotation of the rotating beam 509. The rotatable rotating beam 509 is stuck between the left and right fixed shafts B 503. A T-shaped groove is provided on one end face of the rotating beam 509, and the T-shaped boss at the lower end of the moving plate 511 cooperates with it and can move along the direction of the groove and is fixed to the rotating beam 509 by bolts. Through the cooperation of the hole, the rotating beam 509 and the bolts, the dynamic force loading device B 510 can rotate freely between 0° and 90° and can be fixed at any time. In summary, the Y-direction dynamic force loading device can provide a Y-direction dynamic force for the test shaft 402 of the tested AC double-swing angle milling head 400.

[0050] See Appendix Figure 1 and Figure 4 As shown in the figure, the Z-direction dynamic force loading device 300 includes a base C 301, a "concave"-shaped column A 302, a dynamic force loading device A 303, a movable disc 304, a rotating seat 305, a linear guide rail B 306, a guide rail slider B 307, a connecting plate A 308, etc. The base C 301 moves axially along the groove direction on the floor iron 103 through the T-shaped boss on the bottom surface and is fixed to the floor iron 103 by bolts. The "concave"-shaped column A 302 is connected to the base C 301 by bolts. A small groove is provided on the front end face of the outer side of the "concave" shape of the "concave"-shaped column A 302 for guiding the installation of the linear guide rail B 306, and a freely movable guide rail slider B 307 is installed on the linear guide rail B 306. A ball screw mechanism D with a stepping motor D is fixed to the bottom surface of the inner side of the "concave" shape of the "concave"-shaped column A 302 by bolts.

[0051] The connecting plate A 308 is a "冖"-shaped structural member. The connecting plate A 308 is connected to both the guide rail slider B 307 and the bearing block in the ball screw mechanism D by screws, providing precise height adjustment for the dynamic force loading device A 303. The rotating seat 305 is connected to the connecting plate 308 by bolts. Two arc holes that are centrosymmetric at 90° are provided at the front end of the rotating seat 305. At the same time, a circular hole is provided at the center of the front end of the rotating seat 305. The fixed shaft A is positioned by the hole and connected to the rotating seat 305 by screws, providing support for the rotation of the movable disc 304. The movable disc 304 is installed on the fixed shaft A and can rotate freely. Through the cooperation of the hole, the movable disc 304 and the bolts, the dynamic force loading device 303 can rotate freely between 0° and 90° and can be fixed at any time.

[0052] The dynamic force loading device A 303 is different from the dynamic force loading device B 510 and the dynamic force loading device C 604 in that the axial loading mechanism frame of the dynamic force loading device A 303 is composed of an upper crossbeam, a lower crossbeam, a left column and a right column, and the upper crossbeam, the lower crossbeam, the left column and the right column are fixedly installed to form a closed rectangular frame; a support leg (upper support leg and lower support leg) is respectively arranged at the upper and lower ends of the right column; a lever mechanism with a colinear rotation axis is arranged on the upper support leg, and the lever mechanism is used to change the direction of the loading head force. In summary, the Z-direction dynamic force loading mechanism can provide a Z-direction dynamic force for the test axis 402 of the tested AC double-swing angle milling head 400.

[0053] See attached Figure 1 and Figure 5 The tested AC double-swing milling head 400 includes a milling head body and a test shaft 402, and the milling head body is connected to the milling head Z-direction moving part 205 by bolts; the top of the test shaft 402 is connected to the bottom of the spindle motor of the milling head body by a pin; the test shaft 402 includes a test shaft end cover 402-1, a test shaft housing 402-2, a bearing 402-3, a test shaft body 402-4 and a collar 402-5, etc.; a collar 402-5 is installed in the center of the test shaft body 402-4 for clamping the upper and lower bearings 402-3; test shaft end covers 402-1 are placed at both ends of the bearing, and the end covers are connected to the test shaft housing 402-2 by screws; there is a boss on the surrounding surface of the test shaft housing 402-2, and a hemispherical groove is opened in the center of the boss to position the loading head in the dynamic force loading device B 510 and the dynamic force loading device C 604; there are two bosses on the test shaft end cover 402-1 for the dynamic force loading device A The lever mechanism in 303 is positioned; the test shaft body 402-4 is connected to the transmission shaft II 719 or the transmission shaft V 722 of the transmission device 700 through the protrusion at the bottom, so as to apply dynamic torque to the tested AC double-swing milling head 400.

[0054] See attached Figure 1 , Figure 8 and Fig. 9The transmission device 700 includes a support platform 701, a transmission shaft I lower shell 702, a transmission shaft I upper shell 703, a transmission shaft II lower shell 704, a transmission shaft II upper shell 705, a transmission shaft V upper shell 706, an intermediate shell 707, a transmission shaft III lower shell 708, a transmission shaft III bearing 709, a spur bevel gear III 710, a transmission shaft III 711, a coupling II 712, a transmission shaft I end cover 713, a transmission shaft I bearing 714, a coupling I 715, a transmission shaft I 716, a spur bevel gear I 717, a spur bevel gear II 718, a transmission shaft II 719, a transmission shaft II bearing 720, a transmission shaft II end cover 721, a transmission shaft V 722, spur bevel gear V 723, connecting key 724, transmission shaft V bearing 725, transmission shaft V end cover 726, spur bevel gear IV-1 727, transmission shaft IV housing 728, transmission shaft IV 729, transmission shaft IV bearing 730, transmission shaft IV end cover 731, spur bevel gear IV-2 732 and transmission shaft III end cover 733, etc., the support platform 701 moves along the groove direction on the horizontal iron 103 through the T-shaped boss on the bottom surface, and is fixed to the horizontal iron 103 by bolts; the end face of the support platform 701 is fixed with the transmission shaft I lower housing 702 and the transmission shaft III lower housing 708 by bolts; the transmission shaft I end cover 713 is connected to the horizontal iron 103 through the T-shaped boss on the bottom surface. The transmission shaft Ⅰ lower shell 702 is fixed to the notches at the front and rear ends of the transmission shaft Ⅲ lower shell 708 by bolts; the transmission shaft Ⅲ end cover 733 is fixed to the notches at the front and rear ends of the transmission shaft Ⅲ lower shell 708 by bolts; the transmission shaft Ⅰ upper shell 703 and the transmission shaft Ⅰ lower shell 702 form a shell to protect the transmission shaft Ⅰ 716; at the top of the transmission shaft Ⅰ upper shell 703, the transmission shaft Ⅱ upper shell 705 and the transmission shaft Ⅱ lower shell 704 form a shell to protect the transmission shaft Ⅱ 719; the transmission shaft Ⅴ upper shell 706, the intermediate shell 707 and the transmission shaft Ⅲ lower shell 708 are connected in sequence by bolts to form a shell to protect the transmission shaft Ⅲ 711, the transmission shaft Ⅳ 729 and the transmission shaft Ⅴ 722; the transmission shaft I 716 and the transmission shaft III 711 span across the center and are connected by coupling II 712; the input end of the transmission shaft I 716 is connected by coupling I 715 to the output shaft of the dynamometer 800; the axes of the transmission shaft I 716, the output shaft of the dynamometer 800, coupling I 715, the transmission shaft III 711 and the coupling II 712 are in line; a straight bevel gear I 717 is fixed in the middle of the transmission shaft I 716 by a retaining ring and a key 724, and the straight bevel gear I 717 is meshed with the straight bevel gear II 718 and the rotation center axes are perpendicular to each other; a straight bevel gear III 710 is installed in the middle of the transmission shaft III 711 by a retaining ring and a key, and the straight bevel gear III 710 is meshed with the straight bevel gear IV-2 732 and the rotation center axes are perpendicular to each other; a straight bevel gear V is fixed in the middle of the transmission shaft V 722 by a spring retaining ring and a key 724 723, the spur bevel gear V 723 is meshed with the spur bevel gear IV-1 727 and the rotation center axes are perpendicular to each other;In the actual operation of the test bench, the torque generated by the dynamometer 800 changes the spatial direction of the torque through the mutual linkage of the five axes in the transmission device, making it easier to load the milling head under test at different angles.

[0055] The dynamic force loading device A 303, dynamic force loading device B 510 and dynamic force loading device C 604 described in the present invention are all provided with force sensing devices for detecting the magnitude and frequency changes of the output force, and the dynamometer 800 is provided with a speed sensor and a torque sensor for detecting the magnitude changes of the torque and speed.

[0056] For the working principle of the present invention to be clearly seen, see the attached Fig.10 and Fig.11 The schematic diagrams of dynamic force and torque loading are shown respectively when the main axis of the tested AC double-swing milling head 400 is perpendicular to the ground and parallel to the ground.

Claims

1. AC double-swing milling head reliability test bench with dynamic force and torque mixed loading, characterized by: include: A test bench base (100), a milling head support mechanism (200), an X-direction dynamic force loading device (600), a Y-direction dynamic force loading device (500), a Z-direction dynamic force loading device (300), a tested AC double-swing angle milling head (400), a transmission device (700), and a dynamometer (800); The upper part of the test bench base (100) is provided with a ground iron (103), and the middle part of the ground iron (103) is provided with a T-shaped slot parallel to the Y axis; the lower parts of the X-direction dynamic force loading device (600), the Y-direction dynamic force loading device (500), and the Z-direction dynamic force loading device (300) are all provided with a boss that matches the T-shaped slot of the ground iron (103), and the three are fixedly connected to the ground iron (103) in a movable position; The transmission device (700) and the dynamometer (800) are fixedly connected to the ground iron (103); the milling head support mechanism (200) is a gantry structure, and its two ends are fixedly connected to the two sides of the ground iron (103); the tested AC double-swing angle milling head (400) is fixed on the crossbeam A (203) of the milling head support mechanism (200); The tested AC double-swing milling head (400) is composed of a milling head body and a test shaft (402), and the top of the test shaft (402) is connected to the bottom of the spindle motor of the milling head body through a pin; The bottom of the test shaft (402) is fixedly connected to the transmission shaft II (719) or the transmission shaft V (722) of the transmission device (700), and the two transmission shafts are arranged vertically; the transmission shaft I (716) of the transmission device (700) is fixedly connected to the output shaft of the dynamometer (800) at the input end to apply dynamic torque to the tested AC double-swing angle milling head (400); the loading heads of the dynamic force loading devices of the X-direction dynamic force loading device (600), the Y-direction dynamic force loading device (500), and the Z-direction dynamic force loading device (300) simultaneously act on the force-bearing structure in the middle of the test shaft (402), providing dynamic forces in three directions of X, Y, and Z for the test shaft (402); The test shaft (402) of the tested AC double-swing milling head (400) comprises: a test shaft end cover (402-1), a test shaft housing (402-2), a bearing (402-3), a test shaft body (402-4) and a shaft ring (402-5); the middle shaft section of the test shaft body (402-4) is provided with a shaft ring (402-5) for two bearings (402-3); the outer side of the bearing is provided with a test shaft end cover (402-1) which is fixedly connected to the test shaft housing (402-2); the four surfaces of the test shaft housing (402-2) are projected into a rectangular shape, each surface has a boss in the middle, and a hemispherical groove is opened at the center of the boss; the test shaft end cover (402-1) has two bosses; the test shaft body (402-4) is connected to the transmission shaft II (719) or the transmission shaft V (722) of the transmission device (700) through a protrusion at the bottom.

2. The AC double-swing milling head reliability test bench with dynamic force and torque mixed loading according to claim 1 is characterized in that: The X-direction dynamic force loading device (600) includes: a base E (601), a "concave"-shaped column C (603), a dynamic force loading device C (604), a slider (605), a sliding seat (606), a right-angle fixing plate (607), a connecting plate B (608), a connecting block (610), a linear stepper motor fixing seat (611), a lead screw shaft (612), and a linear stepper motor (613), wherein: the base E (601) is disposed on the lower side of the X-direction dynamic force loading device (600), and is fixedly connected to the floor iron (103) such that the position can be moved along the Y-axis; both sides of the "concave"-shaped column C (603) and the inner side of the "冖”-shaped connecting plate B (608) are respectively connected by a slider rail and a motor-driven ball screw mechanism F, and the "冖”-shaped connecting plate B (608) can move along the Z-axis; two symmetrically arranged right-angle fixing plates (607) are symmetrically and fixedly connected to the front end of the connecting plate B (608), and the sliding seat (606) is fixedly connected to the right-angle fixing plate (607); the linear stepper motor fixing seat (611) is fixedly connected to the side surface of the connecting plate B (608), and the linear stepper motor (613) is fixed thereon; a lead screw shaft (612) is installed at the center of the linear stepper motor (613), and one side of the lead screw shaft (612) is connected to the dynamic force loading device C (604) through a connecting block (610); the loading head of the dynamic force loading device C (604) is matched with the protruding part of the outer shell of the test shaft (402) in the tested AC double swing angle milling head (400).

3. The reliability test bench for an AC double swing angle milling head with hybrid loading of dynamic force and torque according to claim 2, wherein: The Y-direction dynamic force loading device (500) includes: a base D (501), a "concave"-shaped column B (502), a fixed shaft B (503), a guide rail slider C (504), a linear guide rail C (505), a cross beam B (506), a fixing plate (508), a rotating beam (509), a dynamic force loading device B (510), and a moving plate (511), where: the base D (501) and the "concave"-shaped column B (502) on both sides form a gantry structure with the cross beam B (506); the base D (501) is arranged on the lower side of the Y-direction dynamic force loading device (500), and it is fixedly connected to the floor iron (103) with a position that can move along the Y-axis; the "concave"-shaped column B (502) is connected to the cross beam B (506) through a slider rail and a ball screw mechanism E driven by a motor, and the cross beam B (506) can move along the Z-axis; the fixing plate (508) is connected to the cross beam B (506), and the fixing plate (508) is a "冖"-shaped structural member, and two arc holes that are centrosymmetric at 90° are opened at the protruding parts at both ends, and a circular through hole is opened in the center; the fixed shaft B (503) is positioned through the hole and connected to the fixing plate (508) by screws, the rotating beam (509) is arranged between the left and right fixed shafts B (503), the rotating beam (509) can rotate and can be fixed by bolts at any time between 0° and 90°; the moving plate (511) is arranged on the upper part of the rotating beam (509), and the two are slidably connected; the dynamic force loading device B (510) is fixedly connected to the upper side of the moving plate (511); the loading head of the dynamic force loading device B (510) cooperates with another protruding part on the outer shell of the test shaft (402) in the tested AC double swing angle milling head (400).

4. The reliability test bench for the AC double swing angle milling head with combined dynamic force and torque loading according to claim 3, characterized in that: The Z-direction dynamic force loading device (300) includes a base C (301), a "concave"-shaped column A (302), a dynamic force loading device A (303), a movable disc (304), a rotating seat (305), and a connecting plate A (308). The base C (301) is arranged on the lower side of the Z-direction dynamic force loading device (300), and it is fixedly connected to the floor iron (103) with a position that can move along the Y-axis; both sides of the "concave"-shaped column A (302) and the inner side of the "冖"-shaped connecting plate A (308) are respectively connected through a slider rail and a ball screw mechanism D driven by a motor, and the "冖"-shaped connecting plate A (308) can move along the Z-axis; The rotating seat (305) is connected to the connecting plate (308) by bolts. Two arc holes that are centrosymmetric at 90° are opened at the front end of the rotating seat (305). At the same time, a round hole is opened at the center of the front end of the rotating seat (305). The fixed shaft A is positioned through the hole and connected to the rotating seat (305) by screws. The movable disc (304) is installed on the fixed shaft A and can rotate freely, and can be fixed by bolts at any time between 0° and 90°; The described dynamic force loading device A (303) is fixed on the movable disk (304), and its loading head is a lever mechanism; the lever mechanism loading head of the dynamic force loading device A (303) cooperates with the convex part on the outer side of the end cover of the test shaft (402) in the tested AC double swing angle milling head (400).

5. The reliability test bench for an AC double swing angle milling head with combined dynamic force and torque loading according to any one of claims 1-4, characterized in that: The milling head support mechanism (200) includes: a base B (201), a column (202), a cross beam A (203), a milling head X-direction moving member (204) and a milling head Z-direction moving member (205). The base B (201), the column (202), and the cross beam A (203) are fixedly connected to form a gantry structure; a slider rail is provided between the base B (201) and the floor iron (103) of the test bench base (100), and the two slide relative to each other along the Y-axis. A motor-driven ball screw mechanism A parallel to the Y-axis is provided on the lower side of the floor iron (103); the ball screw mechanism A can drive the support mechanism connecting plate (102) in the shape of "冖" passing through the lower side of the floor iron (103) to move along the Y-axis; the outer sides of the left and right columns (202) are fixedly connected to the protruding structures at both ends of the holding mechanism connecting plate (102); a guide rail slider in the X-axis direction and a motor-driven ball screw mechanism B are provided between the "concave"-shaped milling head X-direction moving member (204) and the cross beam A (203); a milling head Z-direction moving member (205) is provided inside the "concave" shape of the milling head X-direction moving member (204), and a guide rail slider in the Z-axis direction and a motor-driven ball screw mechanism C are provided between the two; the bottom surface of the milling head Z-direction moving member (205) is connected to the milling head body in the tested AC double swing angle milling head (400) by bolts.

6. The reliability test bench for an AC double swing angle milling head with combined dynamic force and torque loading according to claim 5, characterized in that: The described transmission device (700) includes: a support housing, a transmission shaft I (716), a transmission shaft II (719), a transmission shaft III (711), a transmission shaft IV (729), and a transmission shaft V (722). Bearings and end covers are provided at the connections between the transmission shafts and the support housing; one end of the transmission shaft I (716) is in transmission connection with the transmission shaft III (711), and their axes are parallel to the Y-axis; the other end of the transmission shaft I (716) is in transmission connection with the output shaft of the dynamometer (800); the middle part of the transmission shaft I (716) transmits power upward to the transmission shaft II (719) arranged in the Z-axis direction through mutually meshing straight bevel gears; a straight bevel gear is provided in the middle of the transmission shaft III (711), and power is transmitted to the transmission shaft V (722) arranged in the Y-axis direction and having a straight bevel gear in the middle through the transmission shaft IV (729) with straight bevel gears provided at both ends; the transmission shaft II (719) or the transmission shaft V (722) is the torque loading output shaft of the transmission mechanism.

7. The reliability test bench for an AC double swing angle milling head with combined dynamic force and torque loading according to claim 6, characterized in that: The dynamic force loading device A (303), the dynamic force loading device B (510) and the dynamic force loading device C (604) are all provided with force sensing devices for detecting the magnitude and frequency changes of the output force, and the dynamometer (800) is provided with a speed sensor and a torque sensor for detecting the magnitude changes of the torque and the speed.

8. The AC double-swing milling head reliability test bench with dynamic force and torque mixed loading according to claim 7 is characterized in that: The dynamic force loading device A (303), the dynamic force loading device B (510) and the dynamic force loading device C (604) are all provided with force sensing devices for detecting the magnitude of the output force and the change of the frequency. The dynamometer (800) is provided with a rotation speed sensor and a torque sensor.

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