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WO2018229966A1 - Machine à tester des matériaux - Google Patents

Machine à tester des matériaux Download PDF

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Publication number
WO2018229966A1
WO2018229966A1 PCT/JP2017/022284 JP2017022284W WO2018229966A1 WO 2018229966 A1 WO2018229966 A1 WO 2018229966A1 JP 2017022284 W JP2017022284 W JP 2017022284W WO 2018229966 A1 WO2018229966 A1 WO 2018229966A1
Authority
WO
WIPO (PCT)
Prior art keywords
crosshead
pair
testing machine
material testing
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/022284
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English (en)
Japanese (ja)
Inventor
麻衣子 苅田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to PCT/JP2017/022284 priority Critical patent/WO2018229966A1/fr
Publication of WO2018229966A1 publication Critical patent/WO2018229966A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Definitions

  • This invention relates to a material testing machine equipped with a crosshead that moves along these screw rods by the rotation of a pair of screw rods.
  • Such a material testing machine has a table, a pair of left and right screw rods erected rotatably on the table, and a nut portion screwed with the pair of left and right screw rods. And a cross head that moves up and down.
  • an upper gripping tool is attached to the crosshead.
  • a lower grip is attached to the table.
  • the test piece is gripped at both ends by these upper and lower grips.
  • the crosshead is raised in this state. At this time, the test force applied to the test piece is detected by a load cell connected to the upper gripping tool. Further, the displacement amount between the upper and lower gauge points of the test piece is detected by a displacement meter.
  • a platen is provided on the crosshead, and the test is performed by lowering the crosshead and pressing the platen against a test piece placed on the table. .
  • Patent Document 1 discloses a distance detection means for detecting a distance to a top surface of a test machine structure, such as a cross yoke, which is disposed opposite to a cross head by a reflected wave reflected from the top surface of a jig such as a load cell.
  • a distance detection means for detecting a distance to a top surface of a test machine structure, such as a cross yoke, which is disposed opposite to a cross head by a reflected wave reflected from the top surface of a jig such as a load cell.
  • the crosshead is stopped to change the attachment position of the distance detection means or correct the collision limit value.
  • a material testing machine that can prevent a jig provided on a cross head from colliding with a testing machine structure such as a cross yoke without any special operation.
  • the length of the test piece is measured by the full length measuring unit, and based on the length of the test piece measured by the full length measuring unit, the distance between the grips using the detection rod and the position detection sensor is described.
  • An automatic material testing machine is disclosed in which the distance between the grips can be automatically adjusted according to the length of the test piece by adjusting the distance of the test piece.
  • JP-A-4-166671 Japanese Patent Laid-Open No. 5-273101
  • the present invention has been made to solve the above-mentioned problems.
  • the parallelism between the crosshead and the table can be easily confirmed, and the parallelism between the table and the crosshead can be easily determined as necessary.
  • An object is to provide a material testing machine that can be adjusted.
  • the invention according to claim 1 has a table, a pair of screw rods, and a pair of nut portions that are respectively screwed with the pair of screw rods, and the pair of screws according to the rotation of the pair of screw rods.
  • a material testing machine comprising a crosshead that moves along a ridge, comprising a pair of measuring devices that measure the distance between the table and the crosshead at two positions separated from each other. To do.
  • the two positions are regions in the vicinity of both end portions of the crosshead.
  • the invention according to claim 3 is the material testing machine according to claim 1 or 2, further comprising a pair of motors for individually rotating the pair of screw rods, and the measurement by the pair of measuring devices.
  • the parallelism between the table and the crosshead is adjusted by driving one of the pair of motors based on the difference in distance between the table and the crosshead.
  • the motor in the material testing machine according to the first or second aspect, the motor, a drive transmission mechanism that transmits the drive of the motor to the pair of screw rods, and the drive transmission mechanism.
  • the table and the table are driven by driving the motor in a state where the transmission of the drive between one of the pair of screw rods by the drive transmission mechanism and the motor is released by the clutch based on the difference. Adjust the parallelism with the crosshead.
  • the parallelism between the crosshead and the table is obtained by measuring the distance between the table and the crosshead at two positions separated from each other with a pair of measuring instruments. Measurement can be easily performed. For this reason, the troublesome operation
  • the table and the crosshead are parallel to each other. The degree can be adjusted.
  • one of the screw rods of the pair of screw rods by the drive transmission mechanism by the clutch based on the difference in distance between the table and the cross head measured by the pair of measuring devices and the motor
  • the parallelism between the table and the cross head can be adjusted by driving the motor in a state where the transmission of the drive between the table and the head is released.
  • FIG. 1 is a schematic diagram of a material testing machine according to a first embodiment of the present invention. It is a block diagram which shows the main control systems of the material testing machine which concerns on 1st Embodiment of this invention. It is a schematic diagram of the material testing machine which concerns on 2nd Embodiment of this invention. It is a schematic diagram of the material testing machine which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the main control systems of the material testing machine which concerns on 3rd Embodiment of this invention. It is a front view showing the neighborhood of one end of crosshead 13 in the material testing machine concerning a 4th embodiment of this invention. It is a top view which shows one end vicinity of the crosshead 13 in the material testing machine which concerns on 4th Embodiment of this invention.
  • FIG. 1 is a schematic diagram of a material testing machine according to a first embodiment of the present invention.
  • This material testing machine has a table 10, a pair of left and right screw rods 11 and 12 that are rotatably provided on the table 10, and a nut portion 18 that is screwed into the pair of left and right screw rods 11 and 12. And a cross head 13 that moves up and down with respect to the screw rods 11 and 12.
  • An upper grip 14 is attached to the cross head 13. Further, a lower grip 15 is attached to the table 10. Both ends of the test piece 100 are gripped by the upper grip 14 and the lower grip 15.
  • a worm wheel 31 is fixed to the lower end of one screw rod 11.
  • the worm wheel 31 is screwed with a worm gear (not shown) that rotates by driving the servo motor 21.
  • a worm wheel 32 is fixed to the lower end of the other screw rod 12.
  • the worm wheel 32 is screwed into a worm gear (not shown) that rotates by driving of the servo motor 22.
  • both ends of the test piece 100 are gripped by the upper grip 14 and the lower grip 15. Then, the crosshead 13 is raised. At this time, the test force applied to the test piece 100 is detected by the load cell 16 connected to the upper gripping tool 14. Further, the displacement amount between the upper and lower gauge points of the test piece 100 is detected by the displacement meter 17. Signals from the load cell 16 and the displacement meter 17 are input to the control unit 50 described later.
  • a pair of distance sensors 23 and 24 are disposed on the upper surface of the table 10. These distance sensors 23 and 24 function as a measuring instrument that measures the distance between the table 10 and the crosshead 13 in a region near both ends of the crosshead 13.
  • the distance sensors 23 and 24 receive light reflected from the surface of the measurement object by a light receiving element, and receive a distance from the light received by the light receiving element to the measurement object. It is a measuring instrument to calculate.
  • PSD Optical Position Sensor / Positive Sensitive Detector
  • C-MOS Complementary Metal Oxide Semiconductor
  • a triangulation type that converts, or a time-of-flight type that measures a small amount of time from when light is irradiated until it is received and converts the time difference into distance is used.
  • FIG. 2 is a block diagram showing a main control system of the material testing machine according to the first embodiment of the present invention.
  • This material testing machine includes a CPU as a processor that executes logical operations, a ROM that stores operation programs necessary for controlling the apparatus, a RAM that temporarily stores data during control, and a hard disk that stores various types of information.
  • the control part 50 comprised from these is provided.
  • the control unit 50 is connected to the distance sensors 23 and 24, the servo motors 21 and 22, the load cell 16, and the displacement meter 17 described above.
  • control unit 50 has a function of a CPU as a processor, a distance difference calculation unit 51 that calculates a difference in distance between the table 10 and the crosshead 13 based on signals from the pair of distance sensors 23 and 24, The parallelism between the table 10 and the crosshead 13 is driven by driving one of the pair of servo motors 21 and 22 based on the distance difference calculated by the distance difference calculation unit 51 by the function of the CPU as a processor.
  • a parallelism adjustment unit 52 for adjustment.
  • the distance between the table 10 and the crosshead 13 is periodically measured in a region near both ends of the crosshead 13 by the pair of distance sensors 23 and 24.
  • the measurement result is transmitted to the control unit 50.
  • the distance difference calculation unit 51 calculates the difference between the distance between the table 10 and the crosshead 13 measured by the distance sensor 23 and the distance between the table 10 and the crosshead 13 measured by the distance sensor 24.
  • the calculation result is displayed on a display unit (not shown).
  • This distance difference measurement may be performed periodically. For example, the distance difference may be measured every time one material test is executed, or the distance difference may be measured at the start of a day's work.
  • the parallelism is continuously adjusted.
  • the parallelism adjustment unit 52 sets the cross head 13 in parallel with the surface of the table 10 so that the screw rod 11 or It is calculated how much one of the screw rods 12 should be rotated.
  • the control unit 50 drives either the servo motor 21 or the servo motor 22, and either the screw rod 11 or the screw rod 12 is placed on the surface of the table 10.
  • the parallelism is adjusted by rotating it until it is arranged in parallel. Thereafter, the material test is executed in a state after the parallelism is adjusted.
  • FIG. 3 is a schematic diagram of a material testing machine according to the second embodiment of the present invention.
  • symbol is attached
  • the distance sensors 23 and 24 instead of the distance sensors 23 and 24 in the material testing machine according to the first embodiment, a pair attached so that a straight line connecting them is parallel to the lower surface of the table 10.
  • the measuring device for measuring the distance between the table 10 and the crosshead 13 in a region near both ends of the crosshead 13 is configured using the potentiometers 33 and 34 and the cable body 37.
  • a potentiometer 33 is disposed at one end of the crosshead 13 and a potentiometer 34 is disposed at the other end. And it has the structure which connected each potentiometer 33,34 and the table 10 by the cable bodies 37, such as a wire.
  • the cable body 37 is arranged in a state perpendicular to the table 10 in a state where the potentiometers 33 and 34 and the table 10 are connected.
  • the potentiometers 33 and 34 are capable of multiple rotations, and a pulley is attached to the rotation shaft of each of the potentiometers 33 and 34, and a cable body 37 is wound around the pulley. A rotating force is applied to the shafts of the potentiometers 33 and 34 in the direction in which the cord body 37 is tensioned by a spring or the like. Accordingly, the rotary shafts of the potentiometers 33 and 34 rotate in conjunction with the raising and lowering of the cross head 13, so that the position of the cross head 13 can be detected from the outputs of the potentiometers 33 and 34. Further, instead of the potentiometers 33 and 34, a rotary encoder may be used.
  • the main control system of the material testing machine has a configuration in which the distance sensors 23 and 24 in FIG. 2 are changed to potentiometers 33 and 34.
  • the distance between the table 10 and the crosshead 13 is measured in a region near the both ends of the crosshead 13 by the pair of potentiometers 33 and 34, so that the above-described first test is performed. It is possible to easily measure the parallelism between the crosshead 13 and the table 10 and execute the adjustment by the same operation as that of the first embodiment.
  • FIG. 4 is a schematic diagram of a material testing machine according to a third embodiment of the present invention.
  • symbol is attached
  • the worm wheel 31 is fixed to the lower end portion of one screw rod 11, and the worm wheel 32 is fixed to the lower end portion of the other screw rod 12.
  • a drive shaft 30 having worm gears (not shown) threadedly engaged with the worm wheels 31 and 32 at both ends thereof is disposed so as to be rotatable about a horizontal axis.
  • a synchronous pulley 36 is disposed on the rotation shaft of the servo motor 22.
  • a synchronous pulley 35 is disposed on the drive shaft 30, and a synchronous belt 38 is wound around the synchronous pulley 36 and the synchronous pulley 35.
  • a clutch 39 for releasing transmission of drive from the motor 22 to the screw rod 11 is provided.
  • the clutch 39 switches between a transmission state in which the driving force is transmitted from one of the two shafts to the other and a transmission release state in which the transmission of the driving force is released. For this reason, when the clutch 39 is in the transmission state, when the drive shaft 30 is rotated by the drive of the servo motor 22, the pair of screw rods 11 and 12 are rotated in synchronization. On the other hand, when the clutch 39 is in the transmission release state, when the drive shaft 30 is rotated by the drive of the servo motor 22, only the screw rod 12 is rotated.
  • FIG. 5 is a block diagram showing a main control system of the material testing machine according to the third embodiment of the present invention.
  • the same members as those in the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the control unit 50 of the material testing machine in the third embodiment is also connected to the clutch 39 described above.
  • the parallelism adjustment unit 52 causes the screw rod 12 to be placed in a state where the crosshead 13 is arranged in parallel to the surface of the table 10. The amount of rotation is calculated. Then, based on the calculation result, the controller 50 drives the servo motor 22 with the clutch 39 in the disengaged state, and causes the screw rod 12 to be parallel to the surface of the table 10. The parallelism is adjusted by rotating it until it is placed. After that, the material test is executed in a state after the clutch 39 is in the transmission state and the parallelism is adjusted.
  • FIG. 6 is a front view showing the vicinity of one end of the crosshead 13 in the material testing machine according to the fourth embodiment of the present invention.
  • FIG. 7 is a plan view showing the vicinity of one end of the crosshead 13 in the material testing machine according to the fourth embodiment of the present invention.
  • the configuration in which the distance between the crosshead 13 and the table 10 is directly measured by the distance sensors 23 and 24 or the potentiometers 33 and 34 is employed.
  • the structure which measures the distance of the crosshead 13 and the table 10 by measuring the height position of the crosshead 13 is employ
  • the dog 26 for the proximity sensor 25 is disposed at the end of the crosshead 13.
  • the dogs 26 are disposed at both ends of the cross head 13 and are used to detect the height positions of the both ends.
  • the dog 26 is fixed at a position having a predetermined height from the table 10.
  • the parallelism between the cross head 13 and the table 10 is separately measured, and the positions of the dogs 26 detected by the proximity sensor 25 are recorded in a state in which they are in parallel. Based on the 25 signals, the parallelism between the cross head 13 and the table 10 can be confirmed.
  • the distance between the proximity sensor 25 and the table 10 is known in advance, by detecting the positions of both ends of the crosshead 13 when the dog 26 is detected by the pair of proximity sensors 25, The distance between the dog 26 fixed to one end of the cross head 13 and the table 10 can be obtained. Assuming that the dog 26 and the proximity sensor 25 are correctly attached, when the crosshead 13 and the table 10 are parallel, the outputs of the two proximity sensors 25 disposed at both ends of the crosshead 13 are used. The timing of is simultaneous. Since the output timing of the proximity sensor 25 disposed at both ends of the crosshead 13 is shifted when the parallelism is shifted, the shift amount is calculated based on the moving speed of the crosshead 13, so that the output at the both ends of the crosshead 13 is calculated.
  • the distance difference from the table 10 can be calculated.
  • the proximity sensor 25 since the attachment positions of the dog 26 and the proximity sensor 25 at both ends of the crosshead 13 often include an error, even if the crosshead 13 and the table 10 are correctly parallel, the proximity sensor 25 is not necessarily at the same time. It doesn't work. In this case, this difference may be measured and stored in advance. That is, the parallelism between the crosshead 13 and the table 10 is separately measured, and the detection position of the dog 26 by the proximity sensor 25 when the parallelism accuracy is sufficiently obtained is recorded, so that it is based on the value of the proximity sensor 25. Thus, the parallelism adjustment can be confirmed.
  • the present invention is applied to a material testing machine that holds both ends of the test piece 100 with the upper gripping tool 14 and the lower gripping tool 15 and performs a tensile test on the test piece 100.
  • the present invention may be applied to a material testing machine that places a platen on the crosshead 13 and performs a compression test on a test piece placed on a table.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

La présente invention concerne une paire de capteurs de distance (23, 24) utilisés afin de mesurer les distances entre une table (10) et une traverse (13) au niveau de zones proches des extrémités de la traverse (13). Si la différence entre les distances entre la table (10) et la traverse (13) aux extrémités de la traverse (13) est supérieure ou égale à une valeur prédéfinie, un degré de parallélisme est réglé par l'entraînement d'un moteur (21) ou d'un moteur (22) de manière à faire tourner une tige filetée (11) ou une tige filetée (12) jusqu'à ce que la traverse (13) soit orientée de manière à être parallèle à la surface de la table (10).
PCT/JP2017/022284 2017-06-16 2017-06-16 Machine à tester des matériaux Ceased WO2018229966A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/022284 WO2018229966A1 (fr) 2017-06-16 2017-06-16 Machine à tester des matériaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/022284 WO2018229966A1 (fr) 2017-06-16 2017-06-16 Machine à tester des matériaux

Publications (1)

Publication Number Publication Date
WO2018229966A1 true WO2018229966A1 (fr) 2018-12-20

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ID=64660396

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PCT/JP2017/022284 Ceased WO2018229966A1 (fr) 2017-06-16 2017-06-16 Machine à tester des matériaux

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11019920B2 (en) * 2016-09-23 2021-06-01 Varidesk, Llc Electrically-lifted computer desk and office desk thereof
US20220107250A1 (en) * 2020-10-05 2022-04-07 Illinois Tool Works Inc. Material testing machines with movable lower crossbeams

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62254035A (ja) * 1986-04-25 1987-11-05 Shimadzu Corp 材料試験装置
JPH06129969A (ja) * 1992-10-16 1994-05-13 Shimadzu Corp 材料試験機
US5437191A (en) * 1993-04-10 1995-08-01 Zwick Gmbh & Co. Hydraulically powered test frame with spindle-actuated valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62254035A (ja) * 1986-04-25 1987-11-05 Shimadzu Corp 材料試験装置
JPH06129969A (ja) * 1992-10-16 1994-05-13 Shimadzu Corp 材料試験機
US5437191A (en) * 1993-04-10 1995-08-01 Zwick Gmbh & Co. Hydraulically powered test frame with spindle-actuated valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11019920B2 (en) * 2016-09-23 2021-06-01 Varidesk, Llc Electrically-lifted computer desk and office desk thereof
US20220107250A1 (en) * 2020-10-05 2022-04-07 Illinois Tool Works Inc. Material testing machines with movable lower crossbeams
US11921087B2 (en) * 2020-10-05 2024-03-05 Illinois Tool Works Inc. Material testing machines with movable lower crossbeams

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