Reliability test device and test method of square tool holder

Abstract

The invention discloses a square tool holder reliability test device and test method, which includes: a ground iron, a square tool holder system, a cutting force automatic loading part, and a cutting vibration loading part, which are fixed on the ground iron; the cutting force automatic loading part includes: the cutting force automatic loading part includes: an electric cylinder, an inclination adjustment mechanism, an automatic turntable and a two-axis slide, which are connected in sequence from top to bottom; the two-axis slide is fixed on the ground iron; the cutting force automatic loading part also includes: a simulated tool bar, one end of which is clamped on the square tool holder cutter disc of the square tool holder system, and the other end is a sphere; the cutting vibration loading part includes: a vibration loading support device and a cutting vibration loading device; a current clamp, a programmable controller, an inclination sensor, an angle sensor, a computer and a data acquisition card are also provided. Conduct reliability tests simulating real working conditions, expose and stimulate product failures, and provide rich and practical data.

Description

Technical Field

[0001] The invention relates to a testing device in the field of numerical control lathe manufacturing and industrial automation control, and more specifically, to a reliability testing device and a testing method for a square tool rest. Background Art

[0002] With the vigorous development of the manufacturing industry in recent years, my country has become a major country in the production and application of CNC machine tools. At present, my country has made major breakthroughs in the research of important core technologies of CNC machine tools, and has achieved some scientific and technological achievements and core technologies with independent intellectual property rights. As one of the most commonly used key functional components in CNC machine tools, the reliability of the rotary tool holder directly affects the precision, stability and processing quality of CNC machine tool processing. Improving its own reliability has an important impact on improving the reliability level of the entire machine.

[0003] At present, the tool holder test bench can perform idling test and eccentric load test on the tool holder, or use hydraulic cylinder to simulate static and dynamic cutting force loading test on the simulated tool. However, the posture adjustment mechanism is heavy, the adjustment position has deviation, and the cutting force loading accuracy and cutting force loading frequency are limited. Summary of the invention

[0004] The purpose of the present invention is to provide a square tool holder reliability test device and test method with mixed loading of electric cylinder and vibration exciter.

[0005] A square tool rest reliability test device, characterized by: a ground iron 1, a square tool rest system, a cutting force automatic loading part, and a cutting vibration loading part, which are fixed on the ground iron 1;

[0006] The automatic cutting force loading part includes: an electric cylinder 10, an inclination adjustment mechanism 11, an automatic turntable 12 and a two-axis slide 13, which are connected in sequence from top to bottom; the two-axis slide 13 is fixed on the ground level iron 1;

[0007] The automatic cutting force loading part also includes: a simulated tool bar 9, one end of which is mounted on the cutter disc of the square tool holder 8 of the square tool holder system, and the other end of which is a sphere;

[0008] The electric cylinder 10 is a direct-connected servo electric cylinder, comprising: a cutting force loading rod 1001, a pressure sensor 1002, an electric cylinder front end face 1003, and an electric cylinder motor 1004;

[0009] The front part of the pressure sensor 1002 is fixedly connected to the cutting force loading rod 1001, and the electric cylinder motor 1004 drives the screw rod to rotate, thereby driving the cutting force loading rod 1001 to move;

[0010] The tilt adjustment mechanism 11 includes: a support base plate 1101, an electric cylinder base 1102, a hinge support 1103, a tilt sensor 1104, a support rod 1105, a lead screw slider 1106, a servo motor 1107, a lead screw 1108, and a lead screw base 1109;

[0011] The front end of the electric cylinder base 1102 is hinged to the front end of the supporting base plate 1101, and a hinge support 1103 is fixedly installed at the lower part thereof, the hinge support 1103 is hinged to the support rod 1105, the lead screw slider 1106 is hinged to the support rod 1105, the lead screw base 1109 and the servo motor 1107 are fixed on the supporting base plate 1101, and the servo motor 1107 rotates to drive the lead screw to rotate, so that the lead screw slider 1106 is displaced, and the support rod 1105 is driven to move;

[0012] The tilt sensor 1104 is arranged at the lower rear part;

[0013] The electric cylinder front end surface 1003 of the electric cylinder 10 is fixed on the electric cylinder base 1102;

[0014] The automatic turntable 22 includes: a turntable base 1201, a worm wheel 1202, a worm bearing 1203, a worm 1204, a worm frame cover 1205, a rotating table 1206, a turntable servo motor 1207 and an angle sensor 1208;

[0015] The turntable servo motor 1207 drives the worm 1204 to rotate, and the worm 1204 drives the meshing worm wheel 1202 to rotate. The rotation angle sensor 1208 is arranged on the top of the worm wheel 1202;

[0016] The two-axis slide 13 includes: an X-direction servo motor 1301, an X-direction slider 1302, a Y-direction servo motor 1303 and a Y-direction slider 1304;

[0017] The Y-direction slider 1304 is a T-shaped structural member, the bottom of which is connected to the Y-direction servo motor 1303. When working, the Y-direction servo motor 1303 drives the Y-direction slider 1304 to move along the Y-axis direction. The top two sides of the Y-direction slider 1304 are provided with threaded holes connected to the automatic turntable 12 above. The bottom of the Y-direction servo motor 1303 is connected to the X-direction slider 1302. The bottom of the X-direction slider 1302 is connected to the X-direction servo motor 1301. When working, the X-direction servo motor 1301 drives the X-direction slider 1302 to move along the X-axis direction.

[0018] The bottom of the X-direction servo motor 1301 is fixed on the horizontal iron 1;

[0019] The turntable base 1201 is fixed on the Y-direction slider 1304;

[0020] The cutting vibration loading part includes: a vibration loading support device 16 and a cutting vibration loading device 15; the cutting vibration loading device 15 is fixed on the vibration loading support device 16, and the vibration loading support device 16 is fixed on the ground level iron 1;

[0021] The cutting vibration loading device 15 comprises: a vibration exciter base 1501, a vibration exciter body 1502, a mandrel 1503, and an acceleration sensor 1504;

[0022] The vibration exciter base 1501 is a structural member formed by connecting three steel plates. Holes are provided on the steel plates on both sides, and the two sides of the vibration exciter body 1502 are connected through the holes. The top rod 1503 is at the top of the vibration exciter body 1502, and the acceleration sensor 1504 is arranged on the top of the top rod 1503.

[0023] The cutting vibration loading support device comprises: a slide rail 1601, a slider 1602, an exciter pad 1603, and a slide servo motor 1604.

[0024] The top of the slider 1602 is provided with a bolt hole, which is connected to the exciter pad 1603, and the bottom of the slider is installed on the slide rail 1601. The slider 1602 is driven by the slide servo motor 1604 to move on the slide rail 1601;

[0025] The exciter base 1501 is fixed on the exciter pad 1603;

[0026] The exciter pad 1603 is a plate made of elastic material.

[0027] The square tool rest system comprises: a square tool rest base 2, a square tool rest 8, a tool rest servo motor 5, a vibration sensor 6, and an angle encoder 7.

[0028] The square tool rest 8 is a vertical tool rest, the tool rest servo motor 5 is a three-phase torque motor, the vibration sensor 6 is a three-axial acceleration sensor arranged on the square tool rest 8; the angle encoder 7 is a voltage output angle sensor, which is installed on the main shaft of the square tool rest 8;

[0029] The square tool holder reliability test device is also provided with a current clamp and a control console 4;

[0030] The current clamp 3 is an AC / DC clamp, and the probe type is an AC / DC current probe. When simulating the real working condition, the current of the square tool holder servo motor is detected by the current clamp 3. The current is three-phase AC, with three phases of U, V, and X. Three current clamps are used to monitor and collect signals of the three-phase current respectively.

[0031] The console 4 includes: a computer, a data acquisition card, and a programmable controller;

[0032] The programmable controller is connected with the inclination sensor, the rotation angle sensor, and each servo motor;

[0033] The data acquisition card is connected to the current clamp, the vibration sensor, and the angle encoder;

[0034] The data acquisition card and programmable controller are respectively connected to the computer mainboard;

[0035] The computer is installed with a data processing program, which includes: the first part is the square tool holder test program set before the test and the motion program of the cutting force automatic loading device and the cutting vibration automatic loading device during the test; the second part is to record and organize the data collected during the entire test process; the third part is to count the vibration conditions, angular accuracy and current changes of the tool holder servo motor of the square tool holder reliability test system under different load conditions after the test.

[0036] Another object of the present invention is to provide a testing method for a square tool holder reliability testing device.

[0037] The test method of the square tool holder reliability test device includes:

[0038] (1) Preparation before the test: Install the simulated tool bar to the appropriate position of the tool holder, install the current clamp, vibration sensor and angle encoder at the appropriate position of the tool holder and the tool holder servo motor lead, input the cutting force loading posture information, simulated cutting force size and simulated cutting vibration frequency to be tested on the console, and start the relevant test after the settings are completed;

[0039] (2) The idling function test of the four-way tool holder in multiple modes: The idling function test of the four-way tool holder is carried out. The idling time of the four-way tool holder is 72 hours, and the tool change frequency is 12 times / min. During the idling function test of the four-way tool holder, the four-way tool holder prototype is ensured to automatically, continuously, and randomly select the nearest tool, and the vibration signal of the four-way tool holder, the indexing accuracy, and the current signal of the tool holder servo motor are tested;

[0040] (3) Square tool holder cutting function test: The simulated tool bar is installed on the tool disc of the square tool holder. The overhang length of the simulated tool bar conforms to the actual use of the square tool holder. The cutting force loading device and the cutting force posture adjustment device are controlled by the console to load the cutting force on the simulated tool bar. The cutting vibration loading device is controlled by the console to load the cutting vibration on the simulated tool bar. The operation time of the square tool holder is 72 hours, and the frequency of tool change is 12 times / min. During the operation of the square tool holder cutting test, the square tool holder prototype is guaranteed to automatically, continuously and randomly select the nearest tool, and the vibration signal of the square tool holder, the indexing accuracy and the current signal of the tool holder servo motor are detected.

[0041] The invention provides a square tool holder reliability test device and test method, which includes: a ground iron, a square tool holder system, a cutting force automatic loading part, and a cutting vibration loading part, which are fixed on the ground iron; the cutting force automatic loading part includes: the cutting force automatic loading part includes: an electric cylinder, an inclination adjustment mechanism, an automatic turntable and a two-axis slide, which are connected in sequence from top to bottom; the two-axis slide is fixed on the ground iron; the cutting force automatic loading part also includes: a simulated tool bar, one end of which is clamped on the square tool holder cutter disc of the square tool holder system, and the other end is a sphere; the cutting vibration loading part includes: a vibration loading support device and a cutting vibration loading device; a current clamp, a programmable controller, an inclination sensor, an angle sensor, a computer and a data acquisition card are also provided. Conduct reliability tests simulating real working conditions, expose and stimulate product failures, and provide rich and practical data.

[0042] The invention is used for reliability detection of square tool holders. Compared with the prior art, the invention has the following beneficial effects:

[0043] (1) The reliability test device for the square tool holder using a mixed load of an electric cylinder and an exciter described in the present invention tests and detects the reliability and precision retention of the square tool holder. By conducting a reliability test simulating real working conditions on the square tool holder driven by a tool holder servo motor, product failures are exposed and stimulated, providing rich and practical data for the reliability growth and evaluation of the product;

[0044] (2) The square tool rest reliability test device using electric cylinder and vibration exciter mixed loading described in the present invention uses electric cylinder and vibration exciter to dynamically and statically load the simulated tool bar supported by the square tool rest, thereby simulating the load borne by the square tool rest during the actual production and processing process. The electric cylinder and vibration exciter used in the present invention form a closed-loop control with the control console, so that their loading has a high loading accuracy;

[0045] (3) The vibration exciter used in the square tool holder reliability test device using the electric cylinder and the vibration exciter mixed loading to vibrate the square tool holder has a wider range of optional vibration frequencies and a more stable output value than the traditional hydraulic cylinder loading, and can better simulate the vibrations that the square tool holder is subjected to during the actual cutting process;

[0046] (4) The square tool holder reliability test device using electric cylinder and vibrator mixed loading of the present invention has an automatic detection system, by installing an angle encoder and an acceleration sensor on the square tool holder, and installing a current clamp on the wire of the tool holder servo motor. It can monitor and record the relevant accuracy data of the square tool holder under simulated real working conditions in real time, and the control console automatically records the failure data when accuracy failure occurs or reaches a critical threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described below in conjunction with the accompanying drawings:

[0048] Figure 1 Axonometric projection diagram of a square tool holder reliability test device for simulating tool bar loading state using a hybrid electric cylinder and exciter for the present invention;

[0049] Figure 2 It is an axonometric projection diagram of an electric cylinder of a cutting force loading device in a square tool holder reliability test device using a hybrid loading of an electric cylinder and a vibrator as described in the present invention;

[0050] Figure 3 It is an axonometric projection diagram of the inclination control part of the cutting force loading device in the square tool rest reliability test device using the electric cylinder and the vibrator mixed loading as described in the present invention;

[0051] Figure 4 It is an exploded axonometric projection diagram of an automatic turntable of a cutting force loading device in a square tool holder reliability test device for mixed loading with an electric cylinder and a vibrator according to the present invention;

[0052] Figure 5 It is an axonometric projection diagram of a two-axis slide of a cutting force loading device in a square tool holder reliability test device for mixed loading with an electric cylinder and a vibrator according to the present invention;

[0053] Figure 6 It is an axonometric projection diagram of the vibration exciter in the cutting vibration loading device of the square tool rest reliability test device using the electric cylinder and the vibration exciter for mixed loading according to the present invention;

[0054] Figure 7 It is an axonometric projection diagram of a support device in a cutting vibration loading device in a square tool rest reliability test device using a hybrid loading of an electric cylinder and a vibration exciter as described in the present invention;

[0055] Figure 8 A flowchart of a square tool holder reliability test method provided by the present invention;

[0056] In the figure: 1. ground level iron, 2. square tool rest support seat, 3. current clamp, 4. control console, 5. tool rest servo motor, 6. vibration sensor, 7. angle encoder, 8 square tool rest, 9. simulated tool bar, 901. simulated tool bar No. 1, 902. simulated tool bar No. 2, 903. simulated tool bar No. 3, 904. simulated tool bar No. 4, 10. electric cylinder, 1001. cutting force loading rod, 1002. pressure sensor, 1003. front end face of electric cylinder, 1004. electric cylinder motor, 11. inclination adjustment mechanism, 1101. support base plate, 1102. electric cylinder base, 1103. hinge support, 1104. inclination sensor, 1105 support rod, 1106. lead screw slider, 1107. servo motor, 1108. lead screw, 1109. lead screw base , 12. Automatic turntable, 1201 turntable base, 1202. Worm gear, 1203 worm bearing, 1204. Worm, 1205. Worm frame cover, 1206. Rotating table, 1207. Turntable servo motor, 1208. Angle sensor, 13. Two-axis slide, 1301. X-direction servo motor, 1302. X-direction slider, 1303. Y-direction servo motor, 1304. Y-direction slider, 14. Cutting force loading device base, 15. Cutting vibration loading device, 1501. Vibrator base, 1502 Vibrator body, 1503. Push rod, 1504. Acceleration sensor, 16. Vibration loading support device, 1601. Slide rail, 1602. Slider, 1603. Vibrator pad, 1604. Slide servo motor. DETAILED DESCRIPTION

[0057] The present invention is described in detail below in conjunction with the accompanying drawings:

[0058] The present invention simulates different working conditions of a square tool holder in actual operation, obtains cutting work data and precision reliability data of the square tool holder under different cutting forces and cutting vibrations, and proposes a complete set of square tool holder reliability test methods.

[0059] The square tool holder reliability test device and test method of the present invention mainly consist of two parts, namely the square tool holder reliability test device and the square tool holder reliability test method.

[0060] Reliability test device for square tool holder

[0061] See also Figure 1 The square tool holder reliability test device of the present invention comprises an auxiliary system, a square tool holder system, a cutting force automatic loading part, a cutting vibration loading part and a data detection system.

[0062] 1. Auxiliary system

[0063] The auxiliary system comprises a ground iron 1, a square tool rest base 2 and a cutting force loading device support base 14.

[0064] The ground iron 1 is a rectangular plate casting, which is installed on the foundation through the base platform therein. The top of the ground iron 1 is provided with dovetail grooves of the same structure that are parallel to each other. The square tool holder base 2 is a box-type structural component, which is welded from seven steel plates. The two top faces are parallel to the bottom face, and there is an appropriate distance between the first top face and the second top face, which is convenient for placing the servo motor 5 and the square tool holder 8. Threaded through holes for installing the square tool holder are provided at the four corners of the top plate, and U-shaped blocks are provided at the four corners of the bottom plate, which are used to fix the square tool holder base 2 to the ground iron 1 through bolts. The cutting force loading device support base 14 is also a box-type structural component, which is welded from six steel plates. The top face and the bottom face are parallel to each other. The four corners of the top plate are provided with threaded through holes for installing the dual-axis slide, and the four corners of the bottom plate are provided with U-shaped blocks, which are used to fix the cutting force loading device support base 14 to the ground iron 1 through bolts.

[0065] 2. Square tool holder system

[0066] The square tool rest system comprises a square tool rest 8 and a tool rest servo motor 5 .

[0067] See also Figure 1 The square tool rest 8 is a LDB4 series vertical tool rest, model LDB4-120, tool change time: 90° is 2.7s, 180° is 3.4s, 270° is 4.1s, the maximum allowable torque: Mq is 700Nm, Ms is 600Nm, Mx is 1800Nm, and the repeat positioning accuracy is <0.005mm.

[0068] See also Figure 1 The tool holder servo motor 5 is a three-phase torque motor, model YXJ83 / 60-120W-4P, power 120W, frequency 50Hz, speed 1400r / min.

[0069] 3. Automatic loading of cutting force

[0070] The automatic cutting force loading part includes a simulated tool bar 9, an electric cylinder 10, an inclination adjustment mechanism 11, an automatic turntable 12, and a two-axis slide table 13.

[0071] 1.Simulated tool bar 9

[0072] The simulated tool bar 9 is a rectangular parallelepiped rod structure with a square or rectangular cross section, and one end of the simulated tool bar 9 is connected to a sphere as a whole. The simulated tool bar 9 is mounted on the tool disc of the square tool holder 8 to be tested, and is used to replace the tool for reliability testing.

[0073] 2. Electric cylinder 10

[0074] See also Figure 2 The electric cylinder 10 is composed of a cutting force loading rod 1001, a pressure sensor 1002, an electric cylinder front end face 1003, and an electric cylinder motor 1104.

[0075] The electric cylinder 10 uses a direct-connected servo electric cylinder with a rated output force of 2.55KN and a maximum output force of 3.82KN. The lead screw has a lead of 100mm. The lead screw extends from the front end of the electric cylinder 10. The front end face 1003 of the electric cylinder is connected to the electric cylinder base 1102 by two bolts. A pressure sensor 1002 is installed in the front of the lead screw. The front of the pressure sensor 1002 is fixedly connected to the cutting force loading rod 1001. When working, the electric cylinder motor 1004 at the rear of the electric cylinder drives the lead screw to rotate, driving the cutting force loading rod 1001 to move. When the cutting force loading rod 1001 reaches the spherical body at the front end of the simulated tool rod 9, the electric cylinder motor 1004 continues to drive the lead screw to gradually increase the pressure on the simulated tool rod 9. The pressure can be measured by the pressure sensor 1002 and fed back to the console 4 in real time. When the pressure applied by the electric cylinder 1004 reaches the preset value, the console controls the stepper motor to stop rotating and keep the lead screw in the current position, thereby simulating the cutting force exerted on the square tool holder under real working conditions.

[0076] 3. Tilt adjustment mechanism 11

[0077] See also Figure 3 The cutting force automatic loading support device is composed of a support base plate 1101, an electric cylinder base 1102, a hinge support 1103, an inclination sensor 1104, a support rod 1105, a screw slider 1106, a servo motor 1107, a screw 1108, and a screw base 1109.

[0078] The inclination sensor 1104 is a high-precision, low-temperature drift, digital display inclination sensor developed by Beijing Qikai Technology, belonging to the QKQHB-OLED series. This series of products uses the latest MEMS electromechanical production process to prepare the core components of inclination measurement, measures the one-dimensional and two-dimensional inclination angles of the sensor relative to the horizontal plane, uses high-quality and reliable MEMS accelerometers, and adopts the optimal algorithm to ensure measurement accuracy. At the same time, temperature compensation is performed, so that the sensor has excellent measurement accuracy and extremely low temperature drift. The standby power consumption of the inclination sensor is 0.22mA, the working current is 48 mA for single axis and 55mA for dual axis. It can work continuously for more than 24 hours, and the accuracy is as high as 0.003° within ±10°. The sensor 11044 is fixed to the appropriate position at the bottom of the electric cylinder base 1102 by bolts. The inclination sensor 1104 is selected together with the console 4 to perform closed-loop control of the cutting force loading angle of the electric cylinder for the cutting force loading device.

[0079] The electric cylinder base 1102 is a long strip (rectangular cross section) plate-like structural member, with cylinders of appropriate length welded to the plate on both sides of the top, and a connecting hinge support 1103 welded to an appropriate position at the bottom. The supporting bottom plate 1011 is also a long strip (rectangular cross section) plate-like structural member, with two columns welded to the bottom plate at the top, and two openings are set on the columns to form a clearance fit with the cylinder of appropriate length welded to the top of the electric cylinder base 1102. The support rod 1105 is a long bar-like structural member, the top of which is hinged to the link hinge support welded to the bottom of the electric cylinder base 1102, and the bottom is hinged to the lead screw slider 1106. The lead screw 1108 cooperates with the lead screw slider 1106, and the lead screw slider 1106 is fixed on the lead screw base 109. The lead screw 1108 and the servo motor 1107 are connected to each other through a coupling. The rotation of the servo motor 1107 drives the lead screw to rotate, so that the lead screw slider is displaced, and the support rod 1105 moves along the corresponding trajectory. The top of the support rod 1105 is hinged to the link hinge support 1103 welded to the bottom of the electric cylinder base 1102, and drives the electric cylinder base 1102 to rotate to a suitable angle. The mechanism controls the cutting force loading angle of the electric cylinder in a closed loop through the inclination sensor 1104 and the control console 4.

[0080] 4. Automatic turntable 12

[0081] See also Figure 4 The automatic turntable 12 is composed of a turntable base 1201, a worm wheel 1202, a worm bearing 1203, a worm 1204, a worm frame cover 1205, a rotating table 1206, a turntable servo motor 1207, and an angle sensor 1208.

[0082] The turntable base 1201 is a box-like structural member, with four bolt holes at the bottom connected to the two-axis slide 13 below the automatic turntable, the worm 1204 is installed in the opening at the front of the turntable base 1201, the worm bearings 1203.1 and worm bearings 1203.2 are installed on both sides of the worm 1204 and placed in the front opening of the turntable base, one end of the worm 1204 is connected to the turntable servo motor 1207 through a coupling, the worm wheel 1202 is placed in the turntable base 1201 and meshed with the worm 1204, an angle sensor 1208 is installed on the top of the worm wheel 1202, a rotating table 1206 is installed on the top of the angle sensor, and the top of the rotating table 1206 The surface is provided with bolt holes connected to the supporting base plate 1101 in the inclination adjustment device 11 above, the worm frame cover plate 1205 is located above the worm 1204, the turntable servo motor 1207 and the angle sensor 1208 are connected to the control console 4 through wires, and during the test, the turntable servo motor 1207 is controlled by the control console 4 to work, the turntable servo motor 1207 drives the worm 1204 to rotate, and the worm 1204 drives the meshing worm wheel 1202 to rotate, when the angle sensor 1208 on the top of the worm wheel 1202 reaches the set angle, that is, when the automatic turntable reaches the corresponding angle, the control console 4 controls the turntable servo motor 1207 to stop, that is, the automatic turntable 12 reaches the set angle.

[0083] 5. Two-axis slide 13

[0084] See also Figure 5 The two-axis slide table is composed of an X-direction servo motor 1301, an X-direction slider 1302, a Y-direction servo motor 1303, and a Y-direction slider 1304.

[0085] The Y-direction slider 1304 is a T-shaped structural member, and its bottom is connected to the Y-direction servo motor 1303. When working, the Y-direction servo motor 1303 drives the Y-direction slider 1304 to move along the Y-axis direction. Threaded holes are provided on both sides of the top of the Y-direction slider 1304 to connect with the automatic turntable 12 above. The bottom of the Y-direction servo motor 1303 is connected to the X-direction slider 1302, and the bottom of the X-direction slider 1302 is connected to the X-direction servo motor 1301. When working, the X-direction servo motor 1301 drives the X-direction slider 1302 to move along the X-axis direction. Both the X-direction servo motor 1301 and the Y-direction servo motor 1303 are controlled by the control console 4. When working, the control console 4 issues a displacement command, and the servo motor drives the slide to move. When it moves to a suitable position, it stops, that is, the two-axis turntable reaches the set position.

[0086] 4. Cutting vibration loading part

[0087] The cutting vibration loading part is composed of a vibration loading support device 16 and a cutting vibration loading device 15 .

[0088] 1. Cutting vibration loading device 15

[0089] See also Figure 6 The cutting vibration loading device 15 is composed of an exciter base 1501, an exciter body 1502, a push rod 1503, and an acceleration sensor 1504.

[0090] The vibrator base 1501 is a structural member formed by connecting three steel plates. The bottom steel plate is provided with bolt holes at the four corners, and the vibrator pad 1603 is connected below. The vibrator pad 1603 is an elastic material plate, and its function is to isolate the vibration of the vibrator during operation to ensure that the vibration of the vibrator is not transmitted to the outside world during operation. The steel plates on both sides of the vibrator base 1501 are provided with holes, through which the vibrator body 1502 can be connected. The top of the vibrator body 1502 is connected by a push rod 1503, and an acceleration sensor 1504 is installed on the top of the push rod 1503. The acceleration sensor 1504 is used to detect the vibration frequency applied to the simulated tool bar 9 by the cutting vibration loading device 15 when it is in the working state.

[0091] The interior of the exciter body 1502 is supported by two sets of upper and lower spring sheets to support a drivable coil, so that the driving coil is in the magnetic gap of the magnetic circuit composed of the iron core, magnetic poles, shell and permanent magnet steel. When the power amplifier supplies variable frequency current to the moving coil, the driving coil will be acted upon by a point force, which in turn drives the top rod 1503 to vibrate, and then transmits the vibration to the spherical body at the top of the simulated tool rod 9 through the acceleration sensor 1504, so as to simulate the cutting vibration that the tool rod of the square tool holder is subjected to in real working conditions.

[0092] 2. Vibration loading support device 16

[0093] See also Figure 7 The cutting vibration loading support device is composed of a slide rail 1601, a slider 1602, an exciter pad 1603, and a slide servo motor 1604.

[0094] The four corners of the top of the slider 1602 are provided with bolt holes, which are connected to the exciter pad 1603. The bottom of the slider is installed on the slide rail 1601. The slider 1602 is driven by the slide servo motor 1604 to move on the slide rail 1601. The slide servo motor 1604 is controlled by the control console 4. When the slider 1602 reaches the predetermined position, the control console 4 controls the slide servo motor 1604 to stop, that is, it reaches the working position.

[0095] 5. Data Detection System

[0096] The data detection system is composed of a current clamp 3, a control console 4, a vibration sensor 6, and an angle encoder 7.

[0097] The current clamp 3 is an AC / DC clamp, and the probe type is an AC / DC current probe. When simulating the actual working condition, the current condition of the square tool holder servo motor is detected by the current clamp 3. The current is three-phase AC with three phases U, V, and X. Three current clamps are used to monitor and collect signals of the three-phase current respectively, and the current data of the tool holder servo motor 5 is collected and recorded in the console 4.

[0098] The vibration sensor 6 is a three-axis acceleration sensor, model ULT2011, which can measure and output acceleration signals in the three axes of X, Y, and Z. It has a magnetic base and can be directly adsorbed on a specified position on the square tool holder 8 to collect vibration signals. When the square tool holder 8 is working, the tool holder vibration data is collected and recorded to the console 4.

[0099] The angle encoder 7 voltage output angle sensor belongs to the QKJ-V05 series. The sensor uses a Hall sensitive element and a non-contact angle position sensor for measuring the rotating shaft. The full-scale angle measurement range is 0° to 359.9°. The angle encoder 7 is installed on the main shaft of the square tool holder 8. When the square tool holder rotates to change the tool, the angle data is collected and recorded in the console 4.

[0100] See also Figure 1 The console 4 is placed in the left front of the horizontal iron 1. The console 4 includes: a display, a keyboard and a mouse, a computer, a data acquisition card, a programmable controller, and a multi-core plug; the computer is the core of the data detection system and is installed inside the box at the bottom of the console 4. The keyboard and a mouse, a display, a programmable controller, and a data acquisition card are respectively connected to the computer installed with a data processing program.

[0101] The keyboard and mouse are installed on the upper end surface of the extended part of the operating table, and their wires are connected to the USB interface of the computer in the console 4 box. The display is a liquid crystal display, which is installed on the upper end surface of the console 4, and the display is connected to the display interface of the computer through an HDMI cable.

[0102] The data acquisition card is a SMACQ brand USB-5000 series data acquisition card with a high sampling rate and a number of channels that meet the test requirements. The data acquisition card is installed inside the computer and connected to the computer's mainboard card slot. The signal channel acquisition interface of the data acquisition card is connected to the current clamp, vibration sensor, and angle encoder in sequence to respectively collect the current of the tool holder servo motor in the working state and the indexing angle and vibration signal of the square tool holder in the working state.

[0103] The programmable controller adopts the Easy Modicon M200 series controllable programmable controller, which is installed inside the computer and connected to the USB interface of the computer with a wire. The inclination sensor, screw servo motor, angle sensor, turntable servo motor, X-direction servo motor, Y-direction servo motor and slide servo motor in the above-mentioned cutting force automatic loading device are all connected to the programmable controller. When working, the position state data of the cutting force and cutting vibration loading to simulate the real working conditions are input into the controllable programmable controller through the mouse and keyboard, and then the programmable controller controls the cutting force automatic loading device and the cutting vibration automatic loading device to automatically adjust to the corresponding position.

[0104] The data processing program is pre-installed in the computer. The data processing program includes three parts. The first part is the square tool holder test program set before the test and the motion program of the cutting force automatic loading device and the cutting vibration automatic loading device during the test. The second part is to record and organize the sensor data collected during the entire test process. The third part is to statistically analyze the vibration conditions, angular accuracy and current changes of the tool holder servo motor of the square tool holder reliability test system under different load conditions after the test.

[0105] The square tool holder reliability test method described in the present invention is a method carried out on the basis of adopting the square tool holder reliability test device described above, and proposes a set of reliability test methods for the square tool holder to be tested.

[0106] (1) Preparation before the test: Install the simulated tool bar to the appropriate position of the square tool holder and the tool disc, install the measuring device at the appropriate position of the square tool holder and the tool holder servo motor lead, input the cutting force loading posture information, simulated cutting force size and simulated cutting vibration frequency to be tested on the console, and after the settings are completed, start the relevant tests.

[0107] (2) The idling function test of the four-way tool holder: For the idling function test of the four-way tool holder, the idling time of the four-way tool holder is 72 hours, and the frequency of tool change is 12 times / minute. During the idling function test of the four-way tool holder, it is ensured that the four-way tool holder prototype automatically, continuously and randomly selects the nearest tool, and detects the vibration signal of the four-way tool holder, the indexing accuracy and the current signal of the tool holder servo motor, so as to timely discover the faults exposed by the four-way tool holder.

[0108] (3) Square tool holder cutting function test: The simulated tool bar is installed on the tool disc of the square tool holder. The overhang length of the simulated tool bar conforms to the actual use of the square tool holder. The cutting force loading device and the cutting force posture adjustment device are controlled by the console to load the cutting force on the simulated tool bar. The cutting vibration loading device is controlled by the console to load the cutting vibration on the simulated tool bar. The operation time of the square tool holder is 72 hours, and the frequency of tool change is 12 times / min. During the operation of the square tool holder cutting test, the square tool holder prototype is guaranteed to automatically, continuously and randomly select the nearest tool, and the vibration signal of the square tool holder, the indexing accuracy and the current signal of the tool holder servo motor are detected, so as to timely discover the faults exposed by the square tool holder.

[0109] The above-mentioned square tool holder reliability test device simulates the real working condition through the cutting force loading device and the cutting vibration loading device; the detection system obtains the accuracy information of the part to be detected of the square tool holder, and transmits it to the control console through the transmission module, and obtains the indexing accuracy, vibration signal data of the square tool holder and the current signal data of the tool holder servo motor after processing; therefore, the above-mentioned square tool holder reliability test device can realize the indexing accuracy, vibration and current signal detection of the square tool holder under the real working condition. The data processed by the computer can be read, recorded and analyzed, so as to evaluate the comprehensive reliability performance of the square tool holder. Therefore, compared with the no-load test device, the present invention is based on the test technology under the real working condition, and the test data is more real and rich; and compared with the traditional detection device based on the hydraulic cylinder, the present invention can better simulate the real cutting vibration and can realize the automatic detection of the various performance indicators of the square tool holder. Compared with the two, the present invention can realize the comprehensive reliability detection of the square tool holder at a low cost.

[0110] The embodiments described in the present invention are intended to facilitate the understanding and application of the present invention by those skilled in the art. The present invention is only an optimized example, or a better specific technical solution. If relevant technical personnel adhere to the basic technical solution of the present invention, make equivalent structural changes or various modifications that do not require creative work, they are all within the protection scope of the present invention.

Claims

1. Square tool holder reliability test device, characterized by: A ground iron (1), a square tool holder system, a cutting force automatic loading part, and a cutting vibration loading part, which are fixed on the ground iron (1); The automatic cutting force loading part comprises: an electric cylinder (10), an inclination adjustment mechanism (11), an automatic turntable (12) and a two-axis slide table (13), which are connected in sequence from top to bottom; the two-axis slide table (13) is fixed on the ground level iron (1); The cutting force automatic loading part also includes: a simulated tool bar (9), one end of which is mounted on the cutter disc of the square tool holder (8) of the square tool holder system, and the other end of which is a sphere; The electric cylinder (10) is a direct-connected servo electric cylinder, comprising: a cutting force loading rod (1001), a pressure sensor (1002), an electric cylinder front end surface (1003), and an electric cylinder motor (1004); The front portion of the pressure sensor (1002) is fixedly connected to the cutting force loading rod (1001), and the electric cylinder motor (1004) drives the screw rod to rotate, thereby driving the cutting force loading rod (1001) to move; The inclination adjustment mechanism (11) comprises: a supporting base plate (1101), an electric cylinder base (1102), a hinge support (1103), an inclination sensor (1104), a support rod (1105), a lead screw slider (1106), a servo motor (1107), a lead screw (1108), and a lead screw base (1109); The front end of the electric cylinder base (1102) is hinged to the front end of the supporting base plate (1101), a hinge support (1103) is fixedly installed at the lower part thereof, the hinge support (1103) is hinged to the support rod (1105), the lead screw slider (1106) is hinged to the support rod (1105), the lead screw base (1109) and the servo motor (1107) are fixed on the supporting base plate (1101), and the servo motor (1107) rotates to drive the lead screw to rotate, so that the lead screw slider (1106) is displaced, thereby driving the support rod (1105) to move; The tilt sensor (1104) is arranged at the lower rear part; The electric cylinder front end surface (1003) of the electric cylinder (10) is fixed on the electric cylinder base (1102); The automatic turntable (12) comprises: a turntable base (1201), a worm wheel (1202), a worm bearing (1203), a worm (1204), a worm frame cover (1205), a rotating table (1206), a turntable servo motor (1207), and a rotation angle sensor (1208); The turntable servo motor (1207) drives the worm (1204) to rotate, and the worm (1204) drives the meshing worm wheel (1202) to rotate, and the rotation angle sensor (1208) is arranged on the top of the worm wheel (1202); The two-axis slide table (13) comprises: an X-direction servo motor (1301), an X-direction slider (1302), a Y-direction servo motor (1303) and a Y-direction slider (1304); The Y-direction slider (1304) is a T-shaped structural member, the bottom of which is connected to the Y-direction servo motor (1303). When in operation, the Y-direction servo motor (1303) drives the Y-direction slider (1304) to move along the Y-axis direction. The top two sides of the Y-direction slider (1304) are provided with threaded holes connected to the automatic turntable (12) above. The bottom of the Y-direction servo motor (1303) is connected to the X-direction slider (1302). The bottom of the X-direction slider (1302) is connected to the X-direction servo motor (1301). When in operation, the X-direction servo motor (1301) drives the X-direction slider (1302) to move along the X-axis direction. The bottom of the X-direction servo motor (1301) is fixed on the horizontal iron (1); The turntable base (1201) is fixed on the Y-direction slider (1304).

2. The square tool holder reliability test device according to claim 1, characterized in that: The cutting vibration loading part comprises: a vibration loading support device (16) and a cutting vibration loading device (15); the cutting vibration loading device (15) is fixed on the vibration loading support device (16), and the vibration loading support device (16) is fixed on the ground iron (1); The cutting vibration loading device (15) comprises: a vibration exciter base (1501), a vibration exciter body (1502), a push rod (1503), and an acceleration sensor (1504); The vibration exciter base (1501) is a structural member formed by connecting three steel plates, and holes are provided on the steel plates on both sides, and the two sides of the vibration exciter body (1502) are connected through the holes; the top rod (1503) is at the top of the vibration exciter body (1502), and the acceleration sensor (1504) is arranged on the top of the top rod (1503); The cutting vibration loading support device comprises: a slide rail (1601), a slider (1602), an exciter pad (1603), and a slide servo motor (1604); The top of the slider (1602) is provided with a bolt hole, which is connected to the exciter pad (1603); the bottom of the slider is installed on the slide rail (1601); the slider (1602) is driven by the slide servo motor (1604) to move on the slide rail (1601); The vibration exciter base (1501) is fixed on the vibration exciter pad (1603); The exciter pad (1603) is a plate of elastic material.

3. The square tool holder reliability test device according to claim 2, characterized in that: The square tool rest system comprises: a square tool rest base (2), a square tool rest (8), a tool rest servo motor (5), a vibration sensor (6), and an angle encoder (7).

4. The square tool holder reliability test device according to claim 3, characterized in that: The square tool rest (8) is a vertical tool rest, the tool rest servo motor (5) is a three-phase torque motor, the vibration sensor (6) is a three-axial acceleration sensor arranged on the square tool rest (8), and the angle encoder (7) is a voltage output angle sensor installed on the main shaft of the square tool rest (8).

5. The square tool holder reliability test device according to claim 4, characterized in that: The square tool holder reliability test device is also provided with a current clamp (3) and a control console (4); The current clamp (3) is an AC / DC clamp, and the probe type is an AC / DC current probe. When simulating a real working condition, the current of the square tool holder servo motor is detected by the current clamp (3). The current is a three-phase AC current with three phases of U, V, and X. Three current clamps are used to monitor and collect signals of the three-phase current respectively. The console (4) comprises: a computer, a data acquisition card, and a programmable controller; The programmable controller is connected with the inclination sensor, the rotation angle sensor, and each servo motor; The data acquisition card is connected to the current clamp, the vibration sensor, and the angle encoder; The data acquisition card and programmable controller are connected to the computer mainboard respectively.

6. The square tool holder reliability test device according to claim 5, characterized in that: The computer is installed with a data processing program, which includes: the first part is the square tool holder test program set before the test and the motion program of the cutting force automatic loading device and the cutting vibration automatic loading device during the test; the second part is to record and organize the sensor data collected during the entire test process; the third part is to statistically analyze the vibration conditions, angular accuracy and current changes of the tool holder servo motor of the square tool holder reliability test system under different load conditions after the test.

7. A test method based on the square tool holder reliability test device according to claim 1, comprising: (1) Preparation before the test: Install the simulated tool bar to the appropriate position of the tool holder, install the current clamp, vibration sensor and angle encoder at the appropriate position of the tool holder and the tool holder servo motor lead, input the cutting force loading posture information, simulated cutting force size and simulated cutting vibration frequency to be tested on the console, and start the relevant test after the settings are completed; (2) The idling function test of the four-way tool holder in multiple modes: The idling function test of the four-way tool holder is carried out. The idling time of the four-way tool holder is 72 hours, and the tool change frequency is 12 times / min. During the idling function test of the four-way tool holder, the four-way tool holder prototype is ensured to automatically, continuously, and randomly select the nearest tool, and the vibration signal of the four-way tool holder, the indexing accuracy, and the current signal of the tool holder servo motor are tested; (3) Square tool holder cutting function test: The simulated tool bar is installed on the tool disc of the square tool holder. The overhang length of the simulated tool bar conforms to the actual use of the square tool holder. The cutting force loading device and the cutting force posture adjustment device are controlled by the console to load the cutting force on the simulated tool bar. The cutting vibration loading device is controlled by the console to load the cutting vibration on the simulated tool bar. The operation time of the square tool holder is 72 hours, and the frequency of tool change is 12 times / min. During the operation of the square tool holder cutting test, the square tool holder prototype is guaranteed to automatically, continuously and randomly select the nearest tool, and the vibration signal of the square tool holder, the indexing accuracy and the current signal of the tool holder servo motor are detected.

Images