JP2012137398A - Material testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material testing machine capable of preventing an operator from incorrectly operating when adjusting a shaft center and easily performing a shaft center adjustment operation.SOLUTION: A control unit 64 comprises a display control unit 65 for displaying information required for shaft center adjustment to be provided to an operator and a storage unit 74. The display control unit 65 includes: a position display unit 71 for displaying a shaft center position for each test piece height as a position mark on a coordinate diagram having a direction corresponding to a shaft center adjustment direction by means of a plurality of adjustment screws as a coordinate axis; a guidance display unit 72 for guiding a shaft center adjustment operation which is selected based on the position of the position mark on the coordinate diagram and should be executed by the operator; and a direction display unit 73 for displaying the moving direction of the position mark displayed by the position display unit 71 in addition to the position mark in association with the shaft center adjustment operation displayed by the guidance display unit 72 if the shaft center adjustment operation displayed by the guidance display unit 72 is executed.

Description

  The present invention relates to a material testing machine including an axis adjustment device for adjusting the axis of a gripping tool that holds a test piece.

  Such a material testing machine measures the test force and displacement at that time with a load cell and a displacement detector while applying a load to the test piece gripped at both ends by the upper gripper and the lower gripper. The test force-displacement characteristic of the test piece and the SN diagram are obtained. In such a material testing machine, an accurate material test cannot be performed unless the axes of the upper gripper and the lower gripper are aligned. For this reason, in such a material testing machine, a shaft center adjusting device for adjusting the shaft centers of the upper gripping tool and the lower gripping tool is provided.

  Further, in order to facilitate such an operation of adjusting the axis, for example, the result of calculating the eccentricity of the axis of the test piece based on the detection values of a plurality of strain gauges attached to the test piece is displayed on the display means. A material testing machine for display has been proposed (see Patent Document 1).

JP-A 64-31033

By the way, when the operator performs the shaft center adjustment, it is necessary to accurately grasp the degree of the current shaft center shift and to reliably perform the adjustment operation according to the situation. In particular, in a material test called a low cycle fatigue test with a number of repetitions of 10 ⁴ or less, the deviation of the axial center between the upper gripper and the lower gripper has a greater effect on the accuracy and reliability of the test data. High axial alignment is required. For this reason, such a highly accurate axis adjustment is a difficult task for the operator, in which a relatively long time is spent in order to achieve accuracy.

  In addition, the shaft center adjusting device for adjusting the shaft center is provided with a plurality of shaft center adjusting screws. The operator adjusts the shaft center by tightening or loosening these screws while viewing the information on the shaft center adjustment displayed on the monitor or the like. However, as the content displayed on these conventional monitors, for example, it is a thing that only displays the current axial center position etc. at the strain gauge mounting height of the test piece, and how to adjust which screw, It was not possible to tell the operator which direction the shaft moves. Therefore, if the screw operated by the operator is different from the screw to be operated, or if the operator performs an incorrect operation such as loosening the place where the screw should be tightened, the operator will notice the mistake. Tended to be late. If the operator is late in noticing such a mistake, the misalignment of the shaft center will be further enlarged, and further, it will take a long time to adjust the shaft center.

  The present invention has been made to solve the above problems, and provides a material testing machine capable of preventing an erroneous operation at the time of an operator's shaft center adjustment and easily performing the shaft center adjustment operation. Objective.

  The invention described in claim 1 is a material testing machine including an axis adjusting device that adjusts the axis of a gripping tool that holds a test piece by operating a plurality of adjusting screws, Load means, a plurality of strain gauges affixed at a plurality of different heights of the test piece, a measurement means for recording signals from the plurality of strain gauges, and a signal from the measurement means The calculation means for calculating the strain direction and strain amount of the test piece for each of a plurality of heights, and the plurality of adjusting screws based on the strain direction and the strain amount for each of the plurality of heights calculated by the calculation means. A position display means for displaying the position of the axis center for each height of the test piece as a position mark in a coordinate diagram with the direction corresponding to the axis adjustment direction as the coordinate axis, and selection based on the position of the position mark on the coordinate map Should be done by the operator Guidance display means for guiding the center adjustment operation; and if the axis center adjustment operation displayed by the guidance display means is executed, the direction of movement of the position mark displayed by the position display means is indicated by the guidance display means. And direction display means for displaying in addition to the position mark in conjunction with the displayed axis adjustment operation.

  According to a second aspect of the present invention, in the first aspect of the present invention, the guide display means graphically displays the arrangement of the plurality of adjustment screws and “relaxes” the adjustment screws to be operated by the operator. Alternatively, a graphic representing “tighten” is further displayed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the guide display means displays an operation guide message for an adjustment screw in the shaft center adjusting device.

  The invention according to claim 4 is the invention according to claim 2, wherein the adjustment screw includes a horizontal adjustment screw for adjusting a horizontal position of the gripping tool and an angle for adjusting the angle of the gripping tool. When the axis adjustment operation to be performed by the operator is an operation of a horizontal adjustment screw, the guide display means graphically displays the arrangement of a plurality of horizontal adjustment screws, and an angle adjustment screw can be operated. In some cases, the arrangement of the plurality of angle adjusting screws is displayed in a graphic form.

  According to the first aspect of the present invention, in the coordinate diagram in which the coordinate axis is the direction corresponding to the axis adjustment direction by the plurality of adjustment screws, the position display that displays the axis position for each height of the test piece as a position mark. Means, guidance display means for guiding an axis adjustment operation to be performed by the operator, selected based on the position mark position on the coordinate map, and an axis adjustment operation displayed by the guidance display means. Direction display means for displaying the direction of movement of the position mark displayed by the position display means in addition to the position mark in conjunction with the axis adjustment operation displayed by the guidance display means. The operator can recognize that the adjustment screw to be operated indicated on the guidance display means is the same as the adjustment screw that the operator is actually operating to prevent erroneous operation of the adjustment screw. Rukoto can. Even if the operator performs an erroneous operation, the difference between the direction of movement of the position mark displayed by adding to the position mark by the direction display means and the direction of movement of the position mark by the actual operation of the operator can be easily made. Since it can be grasped, the operator can immediately notice an error in the axis adjustment operation. For this reason, the operator can easily perform the shaft center adjustment operation without spending time for the shaft center adjustment operation.

  According to the second aspect of the present invention, the guidance display means further graphically displays the arrangement of the plurality of adjustment screws, and further represents a graphic indicating “loosen” or “tighten” with respect to the adjustment screw to be operated by the operator. Since the display is performed, the operator can more easily notice an operation error of the adjustment screw to be operated.

  According to the third aspect of the present invention, since the guidance display means displays the operation guide message for the adjustment screw in the shaft center adjustment device, the operator confirms the procedure of the shaft center adjustment operation according to the operation guide message. Thus, the shaft center adjustment operation can be performed more easily.

  According to the fourth aspect of the present invention, when the axis adjustment operation to be performed by the operator is the operation of the horizontal adjustment screw, the guidance display means graphically displays the arrangement of the plurality of horizontal adjustment screws, and the angle When the adjustment screw is operated, the arrangement of the plurality of angle adjustment screws is displayed in a graphic form, so that the operator can be prevented from operating the horizontal adjustment screw and the angle adjustment screw by mistake.

1 is a schematic diagram of a material testing machine according to the present invention. It is a schematic diagram of the axial center adjustment apparatus. 6 is a schematic plan view of the vicinity of an angle adjusting collar member in the shaft center adjusting device. FIG. 6 is a schematic plan view of the vicinity of a position adjusting collar member 135 in the shaft center adjusting device 13. FIG. It is a schematic diagram which shows a mode that the distortion of the test specimen 10a for a test is measured. It is explanatory drawing which shows the sticking position of the strain gauge 61 in the test piece 10a for a test. It is a block diagram which shows the principal part for implementing this invention among the elements which comprise the control part. It is a display example which shows the shift operation of an axial center, and adjustment operation of the axial center adjustment apparatus 13 corresponding to it. It is a display example which shows the shift operation of an axial center, and adjustment operation of the axial center adjustment apparatus 13 corresponding to it. It is a table associating the positional relationship of the position marks M1 and M2 on the coordinate diagram 81 with the screw operation to be performed by the operator. It is explanatory drawing which shows typically the display state of the position mark in the coordinate map 81, and the addition state of the arrow which shows the direction to which a position mark moves.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a material testing machine according to the present invention.

  The material testing machine includes a base 16, a pair of left and right screw rods 17 erected on the base 16, and a nut portion screwed with the pair of left and right screw rods 17. And a cross head 23 that moves up and down. An upper grip 11 is attached to the cross head 23 via an axis adjusting device 13. In addition, the lower grip 12 is attached to the base 16 via a load cell 15. The both ends of the test piece 10 are gripped by the upper grip 11 and the lower grip 12.

  Synchronous pulleys 21 that engage with the synchronous belt 22 are disposed at the lower ends of the pair of screw rods 17, respectively. The synchronous belt 22 is also engaged with a synchronous pulley 19 that is rotated by driving of the motor 18. For this reason, the pair of screw rods 17 rotate in synchronization with the drive of the motor 18. Then, as the pair of screw rods 17 rotate in synchronization, the cross head 23 moves up and down in the axial direction of the pair of screw rods 17.

  The test force applied to the test piece 10 is detected by the load cell 15. Further, the displacement amount between the upper and lower gauge points of the test piece 10 is detected by the displacement meter 14. Signals from the load cell 15 and the displacement meter 14 are input to a control circuit (not shown). The control circuit creates a drive control signal for the motor 18 based on signals from the load cell 15 and the displacement meter 14. Thereby, the rotation of the motor 18 is controlled, and various material tests such as tension and compression are performed.

  FIG. 2 is a schematic diagram of the shaft center adjusting device 13.

  The shaft center adjusting device 13 is interposed between the cross head 23 and the upper gripper 11, and includes a connection shaft 131 that connects the crosshead 23 and the upper gripper 11, and a center of the connection shaft 131. A frame member 139 fixed to the section, an angle adjusting collar member 134 disposed on the outer periphery of the connecting shaft 131 inside the frame member 139 and fixed to the crosshead 23, and a connecting shaft inside the frame member 139. A position adjusting collar member 135 disposed on the outer periphery of 131 and fixed to the upper gripping tool 11;

  The connecting shaft 131 passes through the angle adjusting collar member 134, the frame member 139, and the position adjusting collar member 135, and the upper end portion of the connecting shaft 131 is screwed with the mounting plate 132. Is screwed to the upper grip 11. The mounting plate 132 is connected to the cross head 23 via a set of jack bolts 133. For this reason, the upper gripper 11 can be fastened to the crosshead 23 with a predetermined force by moving the mounting plate 132 upward with respect to the crosshead 23 using a set of jack bolts 133. .

  The frame member 139 includes a support portion 137 that is screwed and fixed to the connecting shaft 131, and a rectangular frame portion 136 that surrounds the connecting shaft 131. A hemispherical convex portion 138 is formed on the upper surface of the support portion 137, and a hemispherical concave portion having a shape corresponding to the convex portion 138 is formed on the lower surface of the angle adjusting collar member 134. Further, the lower surface of the support portion 137 has a planar shape, and is in contact with the upper surface of the planar position adjusting collar member 135.

  FIG. 3 is a schematic plan view of the vicinity of the angle adjusting collar member 134 in the shaft center adjusting device 13.

  The angle adjusting collar member 134 has a rectangular shape in a plan view, and an outer peripheral surface thereof is a front end portion of four screws 141, 142, 143, and 144 that are screwed with the frame portion 136 of the frame member 139. Abut. For this reason, by adjusting the four screws 141, 142, 143, and 144, the frame member 139 can be inclined together with the connecting shaft 131 to adjust the angle of the upper gripper 11. That is, of the four screws 141, 142, 143, 144, one of the two screws facing each other is loosened and the other is tightened, and the hemispherical convex portion 138 of the frame member 139 is moved to the angle adjusting collar member. The frame member 139 can be tilted together with the connecting shaft 131 by being moved along the hemispherical concave portion 134. As the connecting shaft 131 is inclined, the upper gripper 11 is inclined.

  FIG. 4 is a schematic plan view of the vicinity of the position adjusting collar member 135 in the shaft center adjusting device 13.

  The position adjusting collar member 135 has a rectangular shape in plan view, and an outer peripheral surface thereof is a tip portion of four screws 151, 152, 153, and 154 that are screwed into the frame portion 136 of the frame member 139. Abut. For this reason, by adjusting the four screws 151, 152, 153, and 154, it is possible to adjust the horizontal position of the upper gripper 11 by moving the frame member 139 together with the connecting shaft 131. That is, of the four screws 151, 152, 153, 154, the frame member 139 is moved along the upper surface of the position adjusting collar member 135 in a state where one of the two screws facing each other is loosened and the other screw is tightened. By doing so, the frame member 139 can be moved relative to the position adjusting collar member 135 together with the connecting shaft 131. Then, the upper gripper 11 moves with the relative movement of the connecting shaft 131.

  As described above, in the shaft center adjusting device 13, the four screws 141, 142, 143, 144 that function as angle adjusting screws, and the four screws 151, 152, 153 that function as horizontal adjusting screws, By adjusting the screw corresponding to 154, the horizontal position and angle of the connecting shaft 131 can be adjusted. That is, by performing horizontal adjustment for adjusting the horizontal position of the upper gripping tool 11 and angle adjustment for adjusting the angle, it is possible to adjust the load shafts of the upper gripping tool 11 and the lower gripping tool 12, that is, the shaft center. It has become.

  FIG. 5 is a schematic diagram showing how the strain of the test specimen 10a is measured. FIG. 6 is an explanatory view showing a position where the strain gauge 61 is attached in the test specimen 10a.

  The strain direction and amount of axial center of the upper gripping tool 11 and the lower gripping tool 12 are as follows: the test specimen 10a on which the strain gauge 61 is attached is gripped by the upper gripping tool 11 and the lower gripping tool 12. In this state, measurement is performed with a lighter load (for example, about 20 N) applied to the test specimen 10a. As shown in FIG. 6, four strain gauges 61 are affixed at four different heights above and below the test specimen 10a, for a total of eight.

  As shown in FIG. 5, the strain gauge 61 affixed to the test specimen 10a is connected to a data logger 62 that is a measuring means. The data logger 62 is a measuring device that records the detection value of the strain gauge 61 and stores the result. In this embodiment, one data logger 62 is provided for each strain gauge 61 having the same height.

  Each data logger 62 is connected to a control unit 64 configured by a computer or the like having a ROM, RAM, or the like as a storage device and a CPU or the like as an arithmetic device. The control unit 64 is connected to a display 63 that is a display means. In the control unit 64, based on the detected value of the strain gauge 61 transmitted from each data logger 62, the strain direction and the strain amount for each of the upper and lower heights of the test specimen 10a are calculated. Display control for displaying on the display 63 information necessary for adjusting the axial center is executed.

  Next, an example of a method for calculating the strain direction and the strain amount will be described. First, the strain (G1 to G8) for each position of each strain gauge 61 is calculated from the detected value of each strain gauge 61 recorded by the data logger 62 and sent to the control unit 64. As shown in FIG. 6, four strain gauges 61 are affixed at equal intervals at the same height, and therefore, between two strain gauges 61 facing each other on a surface substantially perpendicular to the load axis at that height. The connecting diagonal line is orthogonal. Each of the orthogonal diagonal lines is defined as an X-axis direction and a Y-axis direction, and an upper-position distortion in the X-axis direction = (G1-G3) / 2 and an upper-position distortion in the Y-axis direction = (G2-G4). / 2, coordinates (upper X, upper Y) representing the strain direction and the strain amount in a plane substantially orthogonal to the load axis at the upper height are obtained. Similarly, the distortion in the X-axis direction at the lower position = (G5-G7) / 2 and the distortion in the Y-axis direction at the lower position = (G6-G8) / 2 are approximately orthogonal to the load axis at the lower height. The (lower X, lower Y) coordinates on the surface are obtained. The coordinate origin is a point where the surface at the upper and lower heights and the load axis intersect.

  In this embodiment, the X-axis at the time of angle adjustment is substantially the same as the line connecting the screw 141 and the screw 142 facing each other in the above-described axial center adjustment device 13, and the X-axis at the time of horizontal adjustment is These are substantially the same as the line connecting the screw 151 and the screw 152 facing each other in the above-described axial center adjusting device 13. In addition, the Y axis at the time of angle adjustment is substantially the same as the line connecting the screw 143 and the screw 144 that face each other in the above-described axis adjustment device 13, and the Y axis at the time of horizontal adjustment is the axis adjustment described above. It is substantially the same as the line connecting the screws 153 and 154 facing each other in the device 13. The unit of the numerical value representing the X-axis and Y-axis distortion is microstrain (με). Strain is a dimensionless amount because it is represented by the amount of deformation per unit length, but in the technical field related to strain measurement, strain (ε: strain) is conventionally used as a unit representing strain. For this reason, in this embodiment as well, a strain is used as a unit of the numerical value of distortion. The upper height coordinates (upper X, upper Y) and the lower height coordinates (lower X, lower Y) obtained by the above-described calculation method are the test piece for each of the upper and lower heights. The axis position is plotted in a coordinate diagram 81 described later.

  FIG. 7 is a block diagram showing a main part for carrying out the present invention among the elements constituting the control unit 64.

  The control unit 64 includes a display control unit 65 for displaying information necessary for axis adjustment provided to the operator on the display 63, a position of a position mark on a coordinate map 81 described later, and an axis to be performed by the operator. And a storage unit 74 that stores a table for associating screw operations for center adjustment. Then, the display control unit 65 displays the position of the axis center for each height of the test piece as a position mark on the coordinate diagram 81 with the direction corresponding to the axis adjustment direction by the plurality of adjustment screws as the coordinate axis. 71, a guide display unit 72 for guiding an axis adjustment operation to be performed by the operator, which is selected based on the position of the position mark on the coordinate map 81, and an axis adjustment operation displayed by the guide display unit 72 is executed. If so, a direction display unit 73 that displays the movement direction of the position mark displayed by the position display unit 71 in addition to the position mark in conjunction with the axis adjustment operation displayed by the guidance display unit 72; Is provided.

  FIG. 8 and FIG. 9 are display examples showing the shift of the axial center and the adjustment operation of the axial center adjusting device 13 corresponding thereto. FIG. 8 is a display example when the operator performs horizontal adjustment to adjust the position in the horizontal direction by operating the horizontal adjustment screw, and FIG. 9 illustrates angle adjustment in which the operator adjusts the angle by operating the angle adjustment screw. It is an example of a display when performing. FIG. 10 is a table for associating the positional relationship of the position marks M1 and M2 stored in the storage unit 74 on the coordinate diagram 81 with screw operations to be performed by the operator.

  In the display example shown in FIG. 8, a coordinate diagram 81 represented two-dimensionally, a front arrangement diagram 83 of an adjustment screw schematically representing the axis adjustment device 13, and a planar arrangement diagram 84 of a horizontal adjustment screw are displayed. In addition, a specific screw operation message is displayed on the operation message display unit 73.

  In the coordinate diagram 81, position marks M1 and M2 indicating the axial center positions at the upper and lower heights of the test specimen 10a for testing are displayed as black circles, respectively. The X-axis and Y-axis in this coordinate map 81 correspond to the X-axis and Y-axis in the above-described strain direction and strain amount calculation method. As described above, the X axis and the Y axis are substantially the same as the line connecting the screws at the positions facing each other among the screws of the shaft center adjusting device 13. Further, the adjustment operation in the shaft center adjustment is a screw operation for moving the frame member 139 of the shaft center adjustment device 13 by loosening one of the two screws facing each other and tightening one of them. Therefore, the coordinate diagram 81 is a coordinate diagram in which the screw at the opposite position is operated to move the frame member 139 of the axis adjustment device 13, that is, the adjustment direction in the axis adjustment is the coordinate axis.

  The position mark is displayed on the coordinate map 81 by the position display unit 71 shown in FIG. 7 on the basis of the (X, Y) coordinate values obtained by the distortion direction and distortion amount calculation method. By such a two-dimensional display, the operator can grasp the deviation of the position mark in the coordinate diagram 81 from the origin, that is, the deviation of the axial center between the upper and lower positions of the test specimen 10a. A circle having a radius of 50 microstrain with the origin in the coordinate diagram 81 as the center is indicated by a broken line, and this indicates a threshold value for adjusting the axis. If there are position marks M1 and M2 in a circle indicating this threshold value, it is possible to perform a material test on the assumption that the axes are substantially aligned.

  83. Characters A and C in the front arrangement drawing 83 of the adjustment screw are the front arrangement of the screw that performs angle adjustment on the upper side of the broken line in the front arrangement drawing 83 of the adjustment screw, and the front arrangement of the screw that performs the horizontal adjustment on the lower side of the broken line. It shows that it is. Planar Arrangement of Horizontal Adjustment Screws The letter C in FIG. 84 also indicates the plane arrangement of screws for horizontal adjustment.

  The X-axis and Y-axis of the horizontal arrangement diagram 84 of the horizontal adjustment screw indicate the correspondence with the coordinate axes in the coordinate diagram 81. Planar layout of horizontal adjustment screws 0, 90, 180, and 270 in FIG. 84 correspond to the screws 154, 151, 153, and 152 that are horizontal adjustment screws shown in FIG.

  In the front arrangement view 83 of the adjustment screw and the planar arrangement view 84 of the horizontal adjustment screw, an arrow for guiding the operation is added to the adjustment screw to be operated. When the arrow points toward the screw, it means “tighten”, and when the starting point of the arrow is a screw, it means “loosen”. The arrow is displayed by the guidance display unit 72 shown in FIG.

  The operation message display unit 82 displays an operation message for guiding a specific screw operation. The contents of the operation message are recorded in a horizontal adjustment table and an angle adjustment table (see FIG. 10) corresponding to the degree of axial misalignment, that is, the position of the position mark on the coordinate diagram 81, and are stored in the control unit 64. Are stored in the storage unit 74. The display of the operation message on the operation message display unit 82 is performed by the guidance display unit 72 shown in FIG. 7, similarly to the display of the arrow described above.

  In this display example, in the coordinate diagram 81, the position mark M1 at the upper height and the position mark M2 at the lower height are indicated by the same black circle, but the upper height is on the positive side in the Y axis. The position mark M1 is on the negative side, and the position mark M2 at the lower height is on the negative side. The positional relationship between the upper and lower height position marks M1 and M2 corresponds to the state “upper Y is on the positive side of lower Y” of the horizontal adjustment table shown in FIG. For this reason, the operation to be performed at this time “loosen C0 and tighten C180” is selected as the content to be guided to the operator.

  When an operation to be performed by the operator is selected, the guidance display unit 72 determines the direction of the screw to which the arrow should be attached and the arrow attached to the screw. Then, the guidance display unit 72 adds an arrow indicating “loosen” to C0 of the front arrangement drawing 83 of the adjustment screw and the planar arrangement drawing 84 of the horizontal adjustment screw, and also to C180 of the horizontal arrangement screw 84 planar view. Add an arrow that means "relax". Further, the guidance display unit 72 displays the operation message as an operation message for guiding the screw operation together with the selected operation “Loosen C0 and tighten C180.” Together with the character string “Adjust horizontally”. Displayed on the part 82.

  Further, for the position marks M1 and M2 displayed as black circles in the coordinate diagram 81, if the operation according to the screw operation guidance display by the guidance display unit 72 is executed, the position mark moves in the direction of the axis adjustment. An arrow indicating this is added. The arrow indicating the direction in which the position mark moves is performed in conjunction with the screw operation guidance display by the guidance display section 72 by the direction display section 73 shown in FIG. In this display example, “Make horizontal adjustment. Loosen C0 and tighten C180.” In the operation message display section 82 indicates the position mark at the upper and lower heights of the coordinate diagram 81. This is a screw operation for bringing the positions in the Y-axis direction closer to each other. For this reason, arrows facing each other parallel to the Y axis are added to each position mark.

  In the display example shown in FIG. 9, as in the display example shown in FIG. 8, a two-dimensional coordinate diagram 81 and an adjustment screw front layout diagram 83 schematically showing the shaft center adjusting device 13 are displayed. In addition, a specific screw operation message is displayed on the operation message display unit 73. Further, the display example shown in FIG. 9 is in a state in which the angle adjustment is performed after the horizontal adjustment according to the display of the operation message display unit 82 and the like of the display example shown in FIG. For this reason, in FIG. 8, the planar arrangement drawing 85 of the angle adjustment screw is displayed at the position where the planar arrangement drawing 84 of the horizontal adjustment screw is displayed. Characters are also displayed. 85, 0, 90, 180, and 270 in the plan view of the angle adjusting screw correspond to the screws 144, 141, 143, and 142 that are angle adjusting screws shown in FIG.

  In this display example, since the horizontal adjustment of the axial center is performed, the position marks M1 and M2 at the upper and lower heights indicated by black circles in the coordinate diagram 81 are both the position marks M1 in the coordinate diagram 81 of FIG. And the position mark M2. In view of the positional relationship between the position mark M1 and the position mark M2 before the horizontal adjustment shown in FIG. 8, the angle adjustment table shown in FIG. 10B shows the state “(upper X + lower X) / 2 is the positive side”. Applicable. For this reason, the operation to be performed at this time “loosen A270 and tighten A90” is selected as the content to be guided to the operator.

  When an operation to be performed by the operator is selected, the guide display unit 72 determines the direction of the screw to be attached with an arrow and the direction of the arrow attached to the screw. An arrow meaning “relaxing” is added to A270 in the plane arrangement drawing 85 of the horizontal adjustment screw, and an arrow meaning “relaxing” is added to A90. Further, the guidance display unit 72 displays the operation message as an operation message for guiding the screw operation together with the selected operation “Loosen A270 and tighten A90” together with the character string “Adjust the angle”. Displayed on the part 82.

  Further, an arrow indicating the direction in which the position mark moves by adjusting the axis is added to the position mark displayed as a black circle in the coordinate diagram 81 by the direction display unit 73 shown in FIG. The operation “Adjust the angle. Loosen A270 and tighten A90.” Shown in the operation message display section 82 of this display example is a position where the position mark overlaps the Y axis, that is, X = 0. Therefore, it is a screw operation. For this reason, an arrow pointing to the Y axis parallel to the X axis is added to each position mark. In the display example of FIG. 9, since the position marks M1 and M2 before the angle adjustment are both within the threshold circle, the operator performs the material test by omitting the angle adjustment screw operation. You can also.

  As shown in the display examples of FIGS. 8 and 9, when the direction in which the position mark moves is displayed in correspondence with the guidance display of the screw operation by the guidance display unit 72, the operator can see the plane arrangement diagram 84 of the horizontal adjustment screw and the operation message display unit. When the screw operation is not performed according to the guide displayed on the position 82, the position mark moves in a direction different from the direction indicated by the arrow. You can notice an operation mistake. In the display examples shown in FIGS. 8 and 9, specific numerical values of (X, Y) coordinates such as the position marks M1, M2, etc. are displayed at the same time to display information necessary for adjusting the axis. You may make it enrich.

  Next, the operation of adjusting the axis and the operation of adding an arrow to the position mark by the direction display unit 73 will be described in more detail. FIG. 11 is an explanatory diagram schematically showing the display of the position mark in the coordinate diagram 81 and the addition state of an arrow indicating the direction in which the position mark moves, and the coordinate diagram 81 changes in accordance with the operation order of the axis adjustment. Display transitions are indicated by D101 to D105. In FIG. 11, the position mark M1 at the upper height is indicated by a white circle, the position mark M2 at the lower height is indicated by a black circle, and the position mark M3 in the state where the position marks at the upper and lower heights are overlapped. This is indicated by a circle.

  First, the upper height coordinate (upper X, upper Y) and the lower height coordinate (lower X, lower Y) obtained by the position display unit 71 on the coordinate diagram 81 by the calculation method described above. The position marks M1 and M2 are displayed (D101). The axial center adjustment is performed with the aim of a state where both the upper height position mark M1 and the lower height position mark M2 are aligned with the load axis. The goal is to bring both closer to the origin (0, 0) of the coordinate axis 81.

  The horizontal adjustment in the axial center adjustment is performed by using the intermediate coordinates {(upper X + lower X) / 2, (upper Y + lower Y) / 2} between the position mark M1 and the position mark M2 on the coordinate diagram 81 as a target point. This is an adjustment to superimpose M1 and M2. This is executed by the operator operating the screws 151, 152, 153, 154 shown in FIG.

  On the other hand, the angle adjustment in the axial center adjustment is performed on the coordinate diagram 81 with the intermediate coordinates {(upper X + lower X) / 2, (upper Y + lower Y) / 2} between the position mark M1 and the position mark M2 being further coordinated. This is an adjustment to bring it closer to the origin of 81. This is executed by the operator operating the screws 141, 142, 143, and 145 shown in FIG.

  In addition, since the X-axis and the Y-axis of the coordinate map 81 are substantially the same as the lines connecting the screws at the positions facing each other among the screws of the shaft center adjusting device 13, operating the screws at the facing positions. The position mark moves in either the direction parallel to the X axis or the direction parallel to the Y axis. Therefore, in both the horizontal adjustment and the angle adjustment, basically, an operation for moving in the X-axis direction and an operation for moving in the Y-axis direction are separately performed with respect to the target position.

  In this embodiment, the axis adjustment is performed by moving each position mark in the Y-axis direction in the horizontal adjustment, moving in the X-axis direction in the horizontal adjustment, moving in the Y-axis direction in the angle adjustment, It is determined in advance in the order of the movement operation in the X-axis direction by angle adjustment, and the content of each operation is determined from the positional relationship between the upper height position mark M1 and the lower height position mark M2. It is selected from each table shown in FIG. Then, the guidance display unit 72 guides and displays specific screw operations on the display 63 in accordance with this operation order. Note that the operator sequentially adjusts the axis center while viewing the display 63. The data from the strain gauge 61 is measured by the data logger 62 while the operator operates the screw for axis adjustment. In the coordinate diagram 81, the position display unit 72 displays real-time coordinates.

  The positional relationship between the upper height position mark M1 and the lower height position mark M2 displayed in D101 of FIG. 11 is “upper Y is more positive than lower Y”, “ This corresponds to the state where “upper X is negative from lower X” and “(upper Y + lower Y) / 2 is positive” and “(upper X + lower X) / 2 is positive” in the angle adjustment table. . For this reason, the operations corresponding to each state are “Loosen C0 and tighten C180” (moving operation in the Y-axis direction in horizontal adjustment), “Loosen C90 and tighten C270” (Horizontal adjustment) (Movement operation in the X-axis direction), “Loosen A0 and tighten A180” (Movement operation in the Y-axis direction during angle adjustment), “Loosen A270 and tighten A90.” ( Operation for moving in the X-axis direction in angle adjustment) is selected, and operation guidance is displayed by the guidance display unit 72 in this order.

  The guide display unit 72 displays a guide for moving operation in the Y-axis direction in the horizontal adjustment selected from the horizontal adjustment table shown in FIG. At the same time, if the operation “loosen C0 and tighten C180” is executed, the direction display unit 73 moves to a position where the position mark M1 and the position mark M2 move (position indicated by a broken line in D102). A heading arrow is added to each position mark M1, M2.

  When the movement operation in the Y-axis direction in the horizontal adjustment is executed and each position mark M1, M2 moves to the position indicated by the broken-line circle in D102, the guide display unit 72 moves in the X-axis direction in the horizontal adjustment. Displays guidance for operations. At the same time, if the operation “loosen C90 and tighten C270” is executed, the direction display unit 73 moves to a position where each of the position mark M1 and the position mark M2 moves (a position indicated by a dotted circle in D103). A heading arrow is added to each position mark M1, M2. When the operation guided by the operator is executed, the position mark M1 and the position mark M2 are approximately overlapped at an intermediate position (a position corresponding to the position mark M3 of D104), and the horizontal adjustment is completed.

  After the horizontal adjustment, the guidance display unit 72 guides and displays the movement operation in the Y-axis direction in the angle adjustment selected from the angle adjustment table shown in FIG. At the same time, if the operation “loosen A0 and tighten A180” is executed, the direction display unit 73 displays an arrow toward the position where the position mark M3 moves (the position indicated by the broken-line circle in D104). It is added to the position mark M3.

  When the movement operation in the Y-axis direction in the angle adjustment is executed and the position mark M3 after the movement is displayed, the guidance display unit 72 displays the movement operation in the X-axis direction in the angle adjustment. At the same time, if the operation “loosen A270 and tighten A90” is executed, the direction display unit 73 displays an arrow toward the position where the position mark M3 moves (the origin position indicated by a dotted circle in D105). To the position mark M3. When the operator performs the operation guided by the guidance display unit 72, the position mark M3 moves to the origin position of the coordinates, the angle adjustment is finished, and the axis center adjustment is also finished.

  Note that, in D104 and D105 of FIG. 11, for convenience of explanation, the position mark M3 in a state where the position marks at the upper and lower heights are overlapped is expressed as one position mark. The arrows are added to the upper position mark M1 and the lower position mark M2, respectively. Therefore, the arrow added to the position mark M3 is an overlap of the arrows added to the position mark M1 and the position mark M2, respectively. In addition, it is not necessary that both the position marks M1 and M2 completely coincide with the origin, and if the deviation of the axial centers of the upper and lower heights is within the threshold value, the axial center can be substantially adjusted. Therefore, the operator can finish the shaft center adjustment operation and execute the material test.

  In this embodiment, since an arrow indicating the direction in which the position mark moves is added to the position marks M1 and M2, the operator can understand the direction of the axis adjustment by performing the operation while watching the display. It is easy. If the position mark moves in a direction different from the arrow, some operation such as whether the screw different from the screw indicated in the operation guide has been operated, or whether the screw has been tightened or loosened in reverse. Operators can easily notice mistakes.

  In the above-described embodiment, the strain gauge 61 is pasted at the upper and lower heights of the test specimen 10a, but the height at which the strain gauge 61 is pasted is not limited to this. . Further, the shape of the test specimen 10a and the number of strain gauges 61 at the same height of the test specimen 10a are not limited to those described in this embodiment.

DESCRIPTION OF SYMBOLS 10 Test piece 10a Test specimen 11 Upper grip 12 Lower grip 13 Axis center adjustment device 14 Displacement meter 15 Load cell 17 Screw rod 18 Motor 23 Crosshead 61 Strain gauge 62 Data logger 63 Display 64 Control section 65 Display control section 71 Position display unit 72 Guide display unit 73 Direction display unit 74 Storage unit 81 Coordinate diagram 82 Operation message display unit 83 Front layout diagram of adjustment screw 84 Planar layout diagram of horizontal adjustment screw 85 Planar layout diagram of angle adjustment screw 131 Connecting shaft 132 Installation Plate 133 Jack bolt 134 Angle adjusting collar member 135 Position adjusting collar member 136 Frame portion 137 Support portion 138 Convex portion 139 Frame member 141 Screw 142 Screw 143 Screw 144 Screw 151 Screw 152 Screw 153 Screw 154 Screw

Claims (4)

A material testing machine provided with an axis adjustment device that adjusts the axis of a gripping tool that holds a test piece by operating a plurality of adjustment screws,
A load means for applying a load to the test piece;
A plurality of strain gauges affixed at different heights of the test piece;
Measuring means for recording signals from the plurality of strain gauges;
Based on the signal from the measuring means, calculating means for calculating the strain direction and strain amount of the test piece for each of a plurality of heights;
Based on the strain direction and the strain amount for each of the plurality of heights calculated by the calculation means, the coordinate diagram with the direction corresponding to the axis adjustment direction by the plurality of adjustment screws as the coordinate axis, for each height of the test piece Position display means for displaying the axial center position as a position mark;
Guide display means for guiding an axis adjustment operation to be performed by the operator, selected based on the position of the position mark on the coordinate map;
If the axis adjustment operation displayed by the guidance display means is executed, the moving direction of the position mark displayed by the position display means is linked with the axis adjustment operation displayed by the guidance display means. , Direction display means for displaying in addition to the position mark;
A material testing machine characterized by comprising: The material testing machine according to claim 1,
The guidance display means is a material testing machine that graphically displays the arrangement of the plurality of adjustment screws and further displays a graphic representing “loosen” or “tighten” with respect to the adjustment screws to be operated by the operator. In the material testing machine according to claim 1 or 2,
The guide display means is a material testing machine that displays an operation guide message for an adjusting screw in the shaft center adjusting device. The material testing machine according to claim 2,
The adjustment screw is a horizontal adjustment screw for adjusting the horizontal position of the gripping tool, and an angle adjustment screw for adjusting the angle of the gripping tool,
When the axis adjustment operation to be performed by the operator is an operation of a horizontal adjustment screw, the guidance display means graphically displays the arrangement of a plurality of horizontal adjustment screws, and when the operation is an operation of an angle adjustment screw, A material testing machine that graphically displays the arrangement of multiple angle adjustment screws.

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