A column type ultrasonic fatigue testing machine and testing method

Abstract

The present invention discloses a column-type ultrasonic fatigue testing machine and a testing method, which is characterized in that the frame includes a bottom plate, a top plate and a plurality of columns connecting the bottom plate and the top plate; it also includes a transmission frame movably mounted on the column, a servo motor mounted on the top plate, a screw mounted on the servo motor, and a nut seat mounted on the transmission frame and movably connected to the screw; a universal ball head seat is mounted on the transmission frame, a ball head adapted to the universal ball head seat is provided on the ultrasonic mechanism, and a set screw for locking the ball head is installed on the universal ball head seat. The entire frame of the invention is composed of a bottom plate, a top plate and a plurality of columns connecting the bottom plate and the top plate, and the servo motor, ultrasonic mechanism, multi-axis centering platform and drawing base tool head are all integrated on the frame, with fewer overall components, simple structure and small space occupation, and the device can also be directly placed on a laboratory bench or desktop for use.

Description

Technical Field

[0001] The invention relates to an ultrasonic fatigue testing machine, in particular to a column type ultrasonic fatigue testing machine and a testing method. Background Art

[0002] Fatigue testing is a test that uses a specimen of a certain shape to determine the repeatability of the fracture under alternating stress or strain. Ultrasonic fatigue testing is based on the principle of ultrasonic resonance, which generates high-frequency vibration loads on the specimen to complete the cyclic fatigue performance test of the material. Compared with traditional fatigue testing, ultrasonic testing can shorten the test cycle due to its high frequency characteristics and has been increasingly widely used.

[0003] The existing ultrasonic fatigue testing machine basically includes a cabinet, in which a vertical frame and a horizontal frame for driving the ultrasonic mechanism to move are installed. The overall mechanism is multi-functional, the structure is large, the space occupied is large and the cost is high. Therefore, a column type ultrasonic fatigue testing machine and a testing method are proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide a column type ultrasonic fatigue testing machine and a testing method.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a column-type ultrasonic fatigue testing machine and a testing method, comprising a control system, a frame, a multi-axis alignment platform installed on the frame, and an ultrasonic mechanism movably installed on the frame; the frame is characterized in that the frame comprises a bottom plate, a top plate, and a plurality of columns connecting the bottom plate and the top plate; the frame also comprises a transmission frame movably installed on the column, a servo motor installed on the top plate, a screw rod installed on the servo motor, and a nut seat installed on the transmission frame and movably connected to the screw rod; a universal ball head seat is installed on the transmission frame, a ball head adapted to the universal ball head seat is provided on the ultrasonic mechanism, and a set screw for locking the ball head is installed on the universal ball head seat.

[0006] Further preferably, it also includes a screw rod fixing plate installed on the column and movably connected to one end of the screw rod.

[0007] Further preferably, it also includes a force sensor installed on the multi-axis alignment platform, an adapter seat on the force sensor, and a drawing base tool head installed on the adapter seat.

[0008] Further preferably, it also includes a centering module for monitoring the centering position of the ultrasonic mechanism and the drawing base tool head. The centering module is a level installed on the ultrasonic mechanism or a grating sensor arranged on the ultrasonic mechanism and the drawing base tool head.

[0009] Further preferably, it also includes a ball head base installed on the force sensor, a second ball head arranged at the bottom of the adapter and adapted to the ball head base, and a locking member installed on the ball head base for locking the second ball head installed on the ball head base.

[0010] Further preferably, the locking piece is composed of two semicircular locking pieces divided into two.

[0011] More preferably, the machine also includes a temperature sensor installed on the rack for monitoring the temperature of the test piece and a laser sensor for monitoring the amplitude of the test piece.

[0012] Further preferably, it also includes a heating device for heating the test piece, the heating device includes a heating frame, a second screw rod installed on the heating frame, a handwheel installed on the heating frame and transmission connected to the second screw rod, a second nut seat movably installed on the second screw rod, a heating seat connected to the second nut seat, a heater installed on the heating seat, and a heating coil arranged on the heater.

[0013] The beneficial effects of the present invention are as follows: the entire frame is composed of a bottom plate, a top plate and a plurality of columns connecting the bottom plate and the top plate, and the servo motor, the ultrasonic mechanism, the multi-axis alignment platform and the drawing base tool head are all integrated on the frame, with fewer overall components, a simple structure and small space occupation, and the device can also be directly placed on a laboratory bench or a desktop for use; By arranging a universal ball head and a universal ball head seat between the ultrasonic mechanism and the transmission frame, the ultrasonic mechanism can be adjusted horizontally through the universal ball head. When adjusting, it can be done by observing the level meter arranged on the ultrasonic mechanism. The operation is simple and convenient, and before and after adjustment, the ball head can be tightened or loosened by only turning the set screw. By setting up the heating device and the temperature sensor, the specimen is heated by the heating device when it is installed on the ultrasonic mechanism or the pulling test base before the test, and the temperature of the specimen is monitored by the temperature sensor at the same time. After the temperature reaches the set value, the pulling test is directly carried out after being connected and fixed. There is no need to heat the specimen by an additional heating mechanism before transferring the specimen to the equipment for testing, because the temperature of the specimen is difficult to maintain at the set value due to the transfer, which affects the accuracy of the specimen pulling test. At the same time, through the setting of the control system, force sensor and laser sensor, the pulling force applied to the specimen during the test is monitored by the force sensor and the data is transmitted to the control system. The control system controls the servo motor in real time to adjust the position of the ultrasonic mechanism according to the real-time measured pulling force to adjust the pulling force, ensuring that the pulling force is always at the set value during the experiment; through the setting of the laser sensor, the amplitude is monitored in real time during the test and the data is transmitted to the control system. The control system controls the power of the ultrasonic mechanism according to the real-time measured amplitude to ensure that the amplitude is always at the set value, thereby ensuring the accuracy of the specimen pulling test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is a partial structural schematic diagram of the present invention; Figure 4 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 5 It is a partial structural schematic diagram of the present invention; Figure 6 It is a partial cross-sectional structural schematic diagram of the present invention.

[0015] Legend: 1. Frame; 11. Bottom plate; 12. Top plate; 13. Column; 2. Multi-axis alignment platform; 3. Ultrasonic mechanism; 31. Ball head; 4. Transmission frame; 41. Universal ball head seat; 42. Set screw; 5. Servo motor; 51. Screw; 52. Nut seat; 53. Screw fixing plate; 6. Level; 7. Force sensor; 71. Ball head base; 72. Ball head 2; 73. Locking piece; 8. Adapter seat; 81. Drawing base tool head; 9. Temperature sensor; 91. Laser sensor; 92. Heating device; 93. Heating frame; 94. Screw 2; 95. Handwheel; 96. Nut seat 2; 97. Heating seat; 98. Heater; 99. Heating coil. DETAILED DESCRIPTION

[0016] Hereinafter, we will further explain the column-type ultrasonic fatigue testing machine and the testing method of the present invention in conjunction with the accompanying drawings.

[0017] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0018] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1-Figure 6 As shown in, a column-type ultrasonic fatigue testing machine and a testing method, comprising a control system, a frame 1, a multi-axis alignment platform 2 mounted on the frame 1, and an ultrasonic mechanism 3 movably mounted on the frame 1; the frame 1 comprises a bottom plate 11, a top plate 12, and a plurality of columns 13 connecting the bottom plate 11 and the top plate 12; the frame 1 also comprises a transmission frame 4 movably mounted on the column 13, a servo motor 5 mounted on the top plate 12, a screw rod 51 mounted on the servo motor 5, and a nut seat 52 mounted on the transmission frame 4 and movably connected to the screw rod 51; a universal ball head seat 41 is mounted on the transmission frame 4, a ball head 31 adapted to the universal ball head seat 41 is provided on the ultrasonic mechanism 3, and a set screw 42 for locking the ball head 31 is installed on the universal ball head seat 41; The multi-axis alignment platform 2 can be electric or manual; The entire frame 1 is composed of a bottom plate 11, a top plate 12, and a plurality of columns 13 connecting the bottom plate 11 and the top plate 12. The servo motor 5, the ultrasonic mechanism 3, the multi-axis alignment platform 2, and the drawing base tool head 81 are all integrated on the frame 1. The overall components are few, the structure is simple, and the space occupied is small. Moreover, the device can also be directly placed on a laboratory bench or a desktop for use. By arranging a universal ball head 31 and a universal ball head seat 41 between the ultrasonic mechanism 3 and the transmission frame 4, the ultrasonic mechanism 3 can be adjusted to a level through the universal ball head 31. When adjusting, it is sufficient to observe the level meter 6 arranged on the ultrasonic mechanism 3. The operation is simple and convenient, and before and after adjustment, the ball head 31 can be tightened or loosened by only turning the set screw 42.

[0020] In one embodiment, it also includes a screw rod fixing plate 53 installed on the column 13 and movably connected to one end of the screw rod 51.

[0021] In one embodiment, it also includes a centering module for monitoring the position of the ultrasonic mechanism 3 and the drawing base tool head 81. The centering module is a level 6 installed on the ultrasonic mechanism 3 or a grating sensor set on the ultrasonic mechanism 3 and the drawing base tool head 81. When the level 6 is used, it is used to adjust the level by observing the level 6 when adjusting the level. When adjusting the level, the ultrasonic mechanism 3 can be connected to the test piece, and the test piece can be connected to the drawing base tool head 81 to adjust the level synchronously. After the level adjustment is completed, the ball head 31 and the ball head 2 72 are locked by the set screw 42 and the locking member 73; a level 6 can also be set on the adapter base. When adjusting the level, the ultrasonic mechanism 3 and the drawing base tool head 81 are adjusted to the level respectively; When the grating sensor is used for centering, the multi-axis alignment platform 2 is moved to drive the drawing test base, the test piece and the ultrasonic mechanism 3 to deflect. During the adjustment process, whether the centering is determined based on the relative position between the scale grating and the indicator grating.

[0022] In one embodiment, it also includes a force sensor 7 installed on the multi-axis alignment platform, an adapter seat 8 on the force sensor 7, and a pulling base tool head 81 installed on the adapter seat 8. The force sensor 7 is used to measure the force during the pulling test. One end of the test piece is fixed on the pulling base tool head 81, and the other end is connected to the ultrasonic mechanism 3.

[0023] In one embodiment, it also includes a ball head base 71 installed on the force sensor 7, a second ball head 72 arranged at the bottom of the adapter 8 and adapted to the ball head base 71, and a locking member 73 installed on the ball head base 71 for locking the second ball head 72 installed on the ball head base 71; the locking member 73 is composed of two semicircular locking members 73 divided into two; When the adapter seat 8 and the pulling base tool head 81 are adjusted horizontally, the locking piece 73 is loosened. After the horizontal adjustment is completed, the two semicircular locking pieces 73 are tightened, and the ball head 72 is pushed tightly into the ball head base 71 to complete the locking of the adapter seat 8 and the pulling base tool head 81 after the horizontal adjustment.

[0024] In one embodiment, it also includes a temperature sensor 9 installed on the rack 1 for monitoring the temperature of the specimen and a laser sensor 91 for monitoring the amplitude; The apparatus further comprises a heating device 92 for heating the specimen, wherein the heating device 92 comprises a heating frame 93, a screw rod 94 mounted on the heating frame 93, a hand wheel 95 mounted on the heating frame 93 and connected to the screw rod 94, a nut seat 96 movably mounted on the screw rod 94, a heating seat 97 connected to the nut seat 96, a heater 98 mounted on the heating seat 97, and a heating coil 99 arranged on the heater 98; By setting the heating device 92 and the temperature sensor 9, the specimen is installed on the ultrasonic mechanism 3 or the pulling test base before the test, and the heating device 92 is used to heat it. At the same time, the temperature of the specimen is monitored by the temperature sensor 9. After the temperature reaches the set value, the pulling test is directly carried out after being connected and fixed. There is no need to heat the specimen by an additional heating mechanism before transferring the specimen to the equipment for testing. The specimen temperature caused by the transfer is difficult to maintain at the set value, which affects the accuracy of the specimen pulling test. At the same time, through the setting of the control system, force sensor 7 and laser sensor 91, the pulling force applied to the specimen during the test is monitored by the force sensor 7 and the data is transmitted to the control system. The control system controls the servo motor 5 to adjust the position of the ultrasonic mechanism 3 in real time according to the magnitude of the pulling force measured in real time, thereby adjusting the magnitude of the pulling force, thereby ensuring that the pulling force is always at the set value during the experiment; through the setting of the laser sensor 91, the amplitude is monitored in real time during the test and the data is transmitted to the control system. The control system controls the power of the ultrasonic mechanism 3 according to the amplitude measured in real time, thereby ensuring that the amplitude is always at the set value, thereby ensuring the accuracy of the specimen pulling test.

[0025] The present invention, when tested: First, install the test piece on the drawing base tool head 81, and then use the centering module to adjust the level and position of the ultrasonic mechanism 3 and the drawing base tool head 81. After the adjustment is completed, tighten the set screw 42 and tighten the locking piece 73 to complete the position adjustment and fixation of the ultrasonic mechanism 3 and the drawing test base. The multi-axis alignment platform 2 transmits the position at this time to the control system, and the control system sets this place as the zero position. Before testing other test pieces later, there is no need to adjust the angular position of the ultrasonic mechanism 3 and the drawing test. It is only necessary to control the multi-axis alignment platform 2 through the control system to drive the drawing test base to move to the set zero position, and then install and fix the test piece on the drawing test base and the ultrasonic mechanism 3. After the positioning is completed, the connection between the ultrasonic mechanism 3 and the specimen or the connection between the drawing test base and the specimen is released, and then the heating device 92 is driven to drive the heating coil 99 to move to the time position, and then the hand wheel 95 is turned to drive the screw rod 94 to rotate. When the screw rod 94 rotates, it drives the heater 98 to move up and down through the cooperation with the nut seat 96, thereby driving the heating coil 99 to be sleeved on the specimen, and then the heater 98 is controlled to start to heat the specimen. During the heating process, the temperature of the specimen is monitored in real time by the temperature sensor 9 and the temperature of the specimen is transmitted to the control system in real time until the temperature reaches the set temperature value. The control system controls the heater 98 to stop, and then controls the heating device 92 to move away, and then the specimen is connected to the ultrasonic mechanism 3 or the drawing test base; Then, the control system controls the servo motor 5 to drive the ultrasonic mechanism 3 to move upward to apply a pulling force to the test piece and control the ultrasonic mechanism 3 to start. When the ultrasonic mechanism 3 moves up and down, the servo motor 5 is started, and the servo motor 5 drives the screw rod 51 to rotate. The screw rod 51 drives the nut seat 52 to move up and down by cooperating with the nut seat 52. The nut seat 52 drives the transmission frame 4 to move up and down along the column 13, and the transmission frame 4 drives the ultrasonic mechanism 3 to move up and down. At the same time, the pulling force on the specimen is monitored in real time by the force sensor 7 and the data is transmitted to the control system. The control system compares the obtained pulling force with the set standard value, and controls the servo motor 5 to drive the ultrasonic mechanism 3 to move upward or downward to adjust the pulling force according to the comparison result, so as to ensure that the pulling force is always at the set value. At the same time, the amplitude is monitored in real time by the laser sensor 91 and the data is transmitted to the control system. The control system controls and adjusts the power of the ultrasonic mechanism 3 according to the comparison between the acquired amplitude and the set standard to adjust the amplitude so that it is at the set value in real time; This test method ensures that the pulling force and amplitude of the specimen are at the set values ​​throughout the entire pulling test process, thereby ensuring the accuracy of the specimen pulling test.

[0026] The protection scope of the present invention is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present invention.

Claims

1. A column-type ultrasonic fatigue testing machine, comprising a control system, a frame (1), a multi-axis alignment platform (2) mounted on the frame (1), and an ultrasonic mechanism (3) movably mounted on the frame (1); wherein: The frame (1) comprises a bottom plate (11), a top plate (12), and a plurality of columns (13) connecting the bottom plate (11) and the top plate (12); it also comprises a transmission frame (4) movably mounted on the columns (13), a servo motor (5) mounted on the top plate (12), a screw rod (51) mounted on the servo motor (5), and a nut seat (52) mounted on the transmission frame (4) and movably connected to the screw rod (51); a universal ball head seat (41) is mounted on the transmission frame (4); a ball head (31) adapted to the universal ball head seat (41) is provided on the ultrasonic mechanism (3); and a set screw (42) for locking the ball head (31) is mounted on the universal ball head seat (41).

2. The column-type ultrasonic fatigue testing machine according to claim 1, characterized in that: It also includes a screw rod fixing plate (53) mounted on the column (13) and movably connected to one end of the screw rod (51).

3. The column-type ultrasonic fatigue testing machine according to claim 1, characterized in that: It also includes a force sensor (7) mounted on the multi-axis alignment platform, an adapter seat (8) located on the force sensor (7), and a drawing base tool head (81) mounted on the adapter seat (8).

4. The column-type ultrasonic fatigue testing machine according to claim 3, characterized in that: It also includes a centering module for monitoring the positions of the ultrasonic mechanism (3) and the drawing base tool head (81); the centering module is a level meter (6) installed on the ultrasonic mechanism (3) or a grating sensor arranged on the ultrasonic mechanism (3) and the drawing base tool head (81).

5. The column-type ultrasonic fatigue testing machine according to claim 4, characterized in that: It also includes a ball head base (71) mounted on the force sensor (7), a second ball head (72) arranged at the bottom of the adapter seat (8) and adapted to the ball head base (71), and a locking member (73) mounted on the ball head base (71) for locking the second ball head (72) mounted on the ball head base (71).

6. The column-type ultrasonic fatigue testing machine according to claim 5, characterized in that: The locking piece (73) is composed of two semicircular locking pieces (73) divided into two halves.

7. The column-type ultrasonic fatigue testing machine according to claim 1, characterized in that: It also includes a temperature sensor (9) installed on the frame (1) for monitoring the temperature of the test piece and a laser sensor (91) for monitoring the amplitude.

8. The column-type ultrasonic fatigue testing machine according to claim 7, characterized in that: It also includes a heating device (92) for heating the test piece, the heating device (92) comprising a heating frame (93), a second screw rod (94) mounted on the heating frame (93), a hand wheel (95) mounted on the heating frame (93) and drivingly connected to the second screw rod (94), a second nut seat (96) movably mounted on the second screw rod (94), a heating seat (97) connected to the second nut seat (96), a heater (98) mounted on the heating seat (97), and a heating coil (99) arranged on the heater (98).

9. The testing method of a column-type ultrasonic fatigue testing machine according to any one of claims 1 to 8, characterized in that: The test method is as follows: Set the zero position of the specimen: connect the two ends of the specimen to the ultrasonic mechanism and the drawing test base, and then control the multi-axis alignment platform through the control system to drive the drawing test base to move and calibrate. During the mobile calibration process, the centering module is used to detect the position. When it is detected that the drawing test base and the ultrasonic mechanism are aligned, the control system sets the position of the multi-axis alignment platform at this time as the zero position, and subsequent specimens do not need to be re-aligned; Complete the fixation of the ultrasonic mechanism and the pull-out test base: After the alignment is completed, the operator locks the universal ball head seat and the ball head on the ultrasonic mechanism, and then locks the ball head 2 on the ball head base through the locking piece; Heat the specimen: release the clamping of the test base on the specimen, and then drive the heating device to heat the specimen. During the heating process, the temperature of the specimen is monitored in real time by the temperature sensor and the signal is sent to the control system in real time. When the temperature reaches the set value, the heating is stopped and the heating coil is removed; Conduct a pull-out test; clamp one end of the test piece through a pull-out test base, then drive the servo motor to drive the ultrasonic mechanism to pull the test piece and control the ultrasonic mechanism to start the pull-out test on the test piece; Pull-out force monitoring and real-time adjustment during the test: The pull-out force on the test piece is monitored in real time by the force sensor and the data is transmitted to the control system. The control system controls the servo motor to adjust the up and down position of the ultrasonic mechanism according to the monitored force, so that the pull-out force on the test piece is always at the set value during the pull-out test; Amplitude monitoring and real-time adjustment during the test: The amplitude of the test piece is monitored in real time by a laser sensor and the data is transmitted to the control system. The control system controls the ultrasonic mechanism in real time to make adjustments based on the monitored amplitude data to ensure that the amplitude is always at the set value.

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