JP2010078557A - Load cell correction jig, high-speed tension testing machine and high-speed tension testing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load cell correction jig capable of correcting bentness of a load cell so as to be not influenced by bentness of the load cell, without generation of noise due to reflection wave, when, for example, high-speed tension test is performed of low strength of resin and thereby to provide a high-speed tension testing machine capable of implementing easy and correct measurement. <P>SOLUTION: At the aperture side of a clearance section 31 of a weight 7 a wall body 9 is prepared in nearly vertical direction. On the wall body 9 the guide and the correction jig 13 can be installed. The correction jig 13 includes a correcting section correcting the load cell 11. The load cell 11 penetrates the correction jig 13 at a load cell penetrating section 39. Using a string 49 or a wire rod of the correction jig 13 the load cell 11 can be corrected to any direction perpendicular to an axis direction of the load cell 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a load cell correction jig capable of accurately performing a high speed tensile test without being affected by a reflected wave or the like, even if a load cell having a bend is used, and a high speed tensile tester and a high speed tensile test using the same. Regarding the method.

  Conventionally, several test apparatuses and the like have been proposed as methods for measuring high-speed deformation characteristics of materials. However, in a tensile test at a high speed, noise caused by vibration associated with an impact peculiar to high-speed deformation becomes a problem. Therefore, it is necessary to remove this noise when performing a high-speed tensile test of the material.

  As an apparatus for accurately measuring high-speed deformation characteristics by removing noise such as vibration, for example, a high strain rate is applied to a test piece, and at this time, an output rod to which the test piece is attached is used for deformation. There is an apparatus that suppresses vibration of an output rod by measuring stress and restraining within 200 mm from the end of the output rod (Patent Document 1).

JP 2004-4032 A

  However, in an apparatus such as Patent Document 1, since a part of the output rod for measuring the stress of the test piece is completely restrained, vibration generated when high-speed strain is applied to the test piece is transmitted to the output rod and restrained. Therefore, there is a problem that noise may be added to the stress value measured at the output bar.

  Such noise caused by the reflected wave becomes a serious problem particularly when the strength of the test piece is small. For example, if a metal test piece is targeted as in Patent Document 1, the influence of the noise is negligibly small, but when performing a high-speed tensile test of a test material having a low strength such as a resin test piece. Has a large amount of noise against stress. For this reason, there exists a problem that an intensity | strength cannot be measured correctly. For example, since the resin has only about 1/100 the strength of the metal, the stress detected by the test may be about 1/100 that of the metal test piece. For this reason, even a slight noise has a great influence on the test result.

  FIG. 7 is a view showing a high-speed tensile testing machine 50 as an example of an apparatus for measuring the tensile strength of such a test piece at a high speed. In the high-speed tensile testing machine 50, a pair of guides 53 are provided in a vertical direction on a base 51, and the guides 53 are fixed above by a top plate 58. A load cell 55 is fixed between the guides 53 in a substantially vertical direction by a load cell fastening portion 61.

  A test piece 65 is provided below the load cell 55. A test jig 67 is provided below the test piece 65. That is, the load cell 55 is joined to the test jig 67 through the test piece 65.

  The weight 59 passes through the guide 53 and falls downward along the guide 53. The weight 59 is provided with a notch, and the weight 59 does not contact the load cell 55 and the test piece 65. When the weight 59 is dropped from a predetermined height, a force corresponding to the drop height and mass of the weight 59 is applied to the test jig 67.

  The test jig 67 that receives momentary force by the weight 59 applies force to the test piece 65. The test piece 65 is broken by the force received from the weight 59. The weight 59 is received by the shock absorber 63. Thus, the high speed tensile test of the test piece 65 is completed.

  When the test piece 65 receives a force from the weight 59, it deforms according to the force. The stress received at this time is calculated from strain detected by a strain gauge (not shown) provided in the load cell 55.

  However, the impact applied by the weight 59 to the test jig 67 is transmitted to the load cell 55. Therefore, the vibration wave due to the impact propagates in the load cell 55, is reflected by the load cell fastening portion 61, and the reflected wave returns toward the test piece 65 (arrow Q in the figure). Therefore, if the reflected wave returns to the end of the load cell 55 after starting to receive force from the weight 59 until it completely breaks, the measurement value of the stress by the load cell 55 is affected. For this reason, the load cell 55 needs to be sufficiently long.

  On the other hand, a metal bar is usually used for the load cell 55. However, as described above, the load cell needs to have a predetermined length and has a relatively low strength. Therefore, the load cell cannot be completely straightened at the time of manufacture, and some bending occurs.

  Fig.8 (a) is an enlarged view of the P section of FIG. A test piece 65 is joined to the tip of the load cell 55 by a pin 69. A test jig 67 is joined to the lower side of the test piece 65 by a pin 71. When the load cell 55 is bent, the mounting portion with the test piece 65 is not vertical, and an angle is formed.

  In this state, when a force is applied to the test piece 65 (in the direction of arrow U in the figure), a force corresponding to the reaction force is applied to the load cell 55, but R, which is a reaction force corresponding to the force U, is a load cell. 55 is divided into a force S in the axial direction 55 and a force T in a direction perpendicular thereto. That is, a force in the bending direction is applied to the load cell 55.

  Therefore, as shown in FIG. 8 (b), the load detected by the load cell 55 generates noise (V portion in the figure) at the initial stage of the load due to bending stress, thereby preventing accurate measurement.

  Further, as shown in FIG. 9A, in order to remove the influence of the bending of the load cell 55, if the fixing jig 75 for restraining the load cell 55 is provided as in Patent Document 1, the load cell 55 is straightened. However, the aforementioned vibration wave is reflected at the position of the fixing jig 75 closest to the test piece 65 (arrow W in the figure). In this case, as shown in FIG. 9B, noise (X portion in the figure) due to the reflected wave is generated in the vicinity of the final stage, preventing accurate measurement. Such a problem is caused by an increase in the resonance frequency of the load cell 55 itself by fixing the load cell 55. Therefore, by increasing the length of the load cell 55, it is not possible to obtain the effect of increasing the time until the reflected wave returns.

  The present invention has been made in view of such a problem. For example, when performing a low-strength high-speed tensile test of a resin or the like, it is not affected by the bending of the load cell without generating noise due to a reflected wave. Another object of the present invention is to provide a load cell correcting jig capable of correcting the bending of the load cell, and a high-speed tensile testing machine capable of easily and accurately measuring using the load cell correcting jig.

  In order to achieve the above-described object, the first invention is a jig for restraining a load cell used in a high-speed tensile testing machine, and includes a plate, a load cell penetrating portion provided at a tip of the plate, and the load cell penetrating portion. First load cell correction means for applying a force in a direction substantially perpendicular to the axial direction of the load cell to the load cell penetrating the load cell, and substantially in the axial direction of the load cell with respect to the load cell penetrating the load cell penetrating portion. Second load cell correcting means that is vertical and applies a force in a direction substantially perpendicular to the direction of the force applied to the load cell by the first load cell correcting portion, and penetrates the load cell penetrating portion. The load cell correcting jig is capable of applying a force in an arbitrary direction substantially perpendicular to the axial direction of the load cell.

  A pair of arms projecting from the tip of the plate, a first column and a second column respectively provided on the pair of arms, and a wire rod wound behind the first column; A first take-up portion capable of supporting, a third column provided in the vicinity of one side end on the plate, and provided in the vicinity of the other side end of the plate with respect to the third column. A second winding part, and the first load cell correcting means includes a first wire rod that is hung on the first winding part and the first pillar, The second load cell correcting means may include a second wire rod hung on the second winding portion and at least the third column body.

  It is desirable that the first wire and the second wire have no rigidity and have irregularities on the surface.

  Here, the wire includes a string member made of fiber such as cotton and linen such as silk thread, and a fine wire made of metal or resin.

  According to 1st invention, the bending of the load cell used for a high-speed tension test can be corrected easily. Moreover, since force can be applied to the load cell in two directions perpendicular to each other, the load cell can be corrected by applying force in any direction according to the bending direction of the load cell. Moreover, since the load cell correction jig has the load cell penetrating portion, the load cell can be corrected with the load cell attached to the high-speed tensile tester. For this reason, the load cell can be corrected easily and reliably.

  In addition, if the straightening means has a column, a wire, and a winding part for winding the wire, the load cell is covered with the wire. Since a force can be easily applied to the load cell by winding a predetermined amount of the wire, correction is easy. In addition, by using a wire having no rigidity and a surface having irregularities, the load cell is not completely restrained, the contact area between the load cell and the wire is small, and no slip occurs, so that the generation of reflected waves is suppressed.

  The second invention includes a base, a pair of guides standing upright in the vertical direction on the base, a weight penetrating through the guide and provided with a relief portion at a substantially center, and movable along the guide, A load cell provided in a vertical direction and penetrating the escape portion; a wall portion provided behind the weight; and a load cell restraining jig provided at at least one location on the wall portion to correct the bending of the load cell; The load cell restraining jig applies force in a direction substantially perpendicular to the axial direction of the load cell with respect to the plate, the load cell penetrating portion provided at the tip of the plate, and the load cell penetrating the load cell penetrating portion. The first load cell restraint portion to be applied and the load cell penetrating the load cell penetrating portion are substantially perpendicular to the axial direction of the load cell and the first load cell restraint portion. Second load cell restraining means for applying a force in a direction substantially perpendicular to the direction of the force applied to the load cell by the means, and substantially perpendicular to the axial direction of the load cell passing through the load cell penetrating portion. It is a high-speed tensile testing machine characterized in that a force can be applied in an arbitrary direction.

  The size of the load cell correction jig is smaller than the size of the escape portion, and the load cell restraining jig is provided on each of a pair of arms protruding from the tip of the plate and a pair of the arms. A column body and a second column body, a first winding portion provided behind the first column body and capable of winding the wire, and a first winding portion provided near one side end on the plate. 3 and a second winding portion provided in the vicinity of the other side end of the plate with respect to the third pillar, and the first load cell restraining means includes the first load cell restraining means, 1 winding part and the 1st wire rod hung on the 1st pillar, and the 2nd load cell restraining means has the 2nd winding part and at least the 3rd pillar. You may have the 2nd wire rod hung on.

  Moreover, it is desirable that the first wire and the second wire are not rigid and have irregularities on the surface.

  According to the second invention, the bending of the load cell can be easily corrected, so that a high-speed tensile test can be easily performed with high accuracy. Moreover, since force can be applied to the load cell in two directions perpendicular to each other, the load cell can be corrected by applying force in any direction according to the bending direction of the load cell. In particular, since the size of the correction jig is smaller than the size of the escape portion, the weight 7 does not come into contact with the correction jig.

  In addition, if the straightening means has a column, a wire, and a winding part for winding the wire, the load cell is covered with the wire. Since a force can be easily applied to the load cell by winding a predetermined amount of the wire, correction is easy. In addition, by using a wire having no rigidity and a surface having irregularities, the load cell is not completely restrained, the contact area between the load cell and the wire is small, and no slip occurs, so that the generation of reflected waves is suppressed.

  A third invention is a high-speed tensile test method for a material, wherein a base, a pair of guides standing in a substantially vertical direction on the base, the guide penetrates, and a relief portion is provided at a substantially center. A weight movable along the load, a load cell provided in a substantially vertical direction and penetrating the escape portion, a wall provided behind the weight, and at least one place on the wall, and passing through the load cell at the tip The load cell penetrating portion is formed by a first load cell straightening means provided in the load cell straightening jig using a high-speed tensile testing machine comprising a load cell straightening jig for straightening the load cell. A force is applied to the penetrating load cell in a direction substantially perpendicular to the axial direction of the load cell, and the second load cell correcting means provided in the load cell correcting jig A force is applied to the load cell penetrating the load cell penetrating portion in a direction perpendicular to a substantially axial direction of the load cell and substantially perpendicular to a direction of the force applied to the load cell by the first load cell correcting means. In a state in which the bending is corrected, the weight is dropped and a force is applied to a test piece provided below the load cell.

  The load cell restraining jig includes a pair of arms projecting from the tip of the plate, a first column body and a second column body respectively provided on the pair of arms, and a rear side of the first column body. A first winding portion that is provided and capable of winding a wire, a third column provided near one side end on the plate, and the other of the plate with respect to the third column And a second winding part provided in the vicinity of the side end of the first load cell, wherein the first load cell restraining means is hung from the first winding part to the first column body via the load cell. The first load is applied to the load cell by winding the first wire rod by the first winding unit, and the second load cell restraining means is connected to the load cell from the second winding unit via the load cell. At least on the third column A second wire kicked may be imparted a force to the load cell by winding by the second winding portion.

  Moreover, it is desirable that the first wire and the second wire are not rigid and have irregularities on the surface.

  According to the third invention, the bending of the load cell can be easily corrected, and an accurate high-speed tensile test can be performed. Moreover, since force can be applied to the load cell in two directions perpendicular to each other, the load cell can be corrected by applying force in any direction according to the bending direction of the load cell.

  In addition, if the straightening means has a column, a wire, and a winding part for winding the wire, the load cell is covered with the wire. Since a force can be easily applied to the load cell by winding a predetermined amount of the wire, correction is easy. In addition, by using a wire having no rigidity and a surface having irregularities, the load cell is not completely restrained, the contact area between the load cell and the wire is small, and no slip occurs, so that the generation of reflected waves is suppressed.

  According to the present invention, it is possible to correct the bending of the load cell so as not to be affected by the bending of the load cell without generating noise due to a reflected wave when performing a low-strength high-speed tensile test such as resin. A load cell straightening jig and a high-speed tensile testing machine capable of simple and accurate measurement can be provided.

  Hereinafter, the high-speed tensile testing machine 1 concerning embodiment of this invention is demonstrated. FIG. 1 is a front view showing a high-speed tensile testing machine 1.

  The high-speed tensile testing machine 1 mainly includes a base 3, a guide 5, a weight 7, a correction jig 13, and the like.

  A pair of guides 5 are provided on the base 3 so as to stand substantially parallel to the vertical direction. The pair of guides 5 are fixed by a top plate 15. The guide 5 has a function of dropping the weight 7 straight along the guide.

  A load cell 11 is provided between the pair of guides 5 in a substantially vertical direction. The load cell 11 is installed in a state in which an upper end is fixed by a load cell fastening portion 19 joined to the top plate 15 and the other end is suspended downward. The load cell 11 has a function of measuring stress generated in the test piece during the test.

  As the load cell 11, it is desirable to use magnesium in consideration of acoustic impedance matching, particularly in a high-speed tensile test of a resin material. For example, an extruded material of magnesium can be used. Moreover, in order to prevent the influence of a reflected wave, the length of the load cell 11 should be long, for example, about 2 m.

  A test piece 21 is provided below the load cell 11. FIG. 2 is an enlarged view of part A of FIG. A groove is formed below the load cell 11, and a test piece 21 is inserted into the groove. The test piece 21 and the end of the load cell 11 are provided with holes at corresponding positions, and are joined by pins 25.

  A test jig 23 is provided below the test piece 21. Groove processing is performed above the test jig 23, and the lower end of the test piece 21 is inserted into the groove. Holes are provided at corresponding positions at the ends of the test piece 21 and the test jig 23, and are joined by pins 27.

  The test jig 23 is provided with arms 29 on both sides from the mounting portion of the test piece 21 in a substantially horizontal direction. The arm 29 is a part where the weight 7 collides and receives a force.

  A guide 5 passes through the weight 7. FIG. 3 is a view (a cross-sectional view taken along the line BB in FIG. 1) viewed from below the weight 7. The guides 5 penetrate the vicinity of both ends of the weight 7, and the weight 7 can move along the guide 5. An escape portion 31 is provided between the pair of guide 5 penetrating portions of the weight 7. The escape portion 31 is, for example, a U-shaped notch. The load cell 11 penetrates the escape portion 31. Therefore, the load cell 11 does not come into contact with the weight 7.

  Grooves 33 are provided on both sides of the escape portion 31 through the load cell 11 so as to face both sides. The groove 33 is a portion where the arm 29 of the test jig 23 collides. That is, since the weight 7 moves along the guide 5, it falls in a substantially vertical direction. The arms 29 are provided horizontally on both sides of the test jig. For this reason, the weight 7 can simultaneously contact the arms 29 on both sides, and can apply a force to the test jig 23 in the vertical direction.

  Although not shown, a guide having a groove portion provided in the vertical direction along the shape of the test jig 23 may be provided behind the test jig 23. By using the guide and placing the test jig 23 along the groove, the test jig 23 is surely oriented in the vertical direction, and moves downward along the guide groove when receiving a force from the weight 7. Therefore, the test jig 23 can be reliably moved in the vertical direction. Therefore, it is possible to reliably apply a vertical force to the test piece 21.

  A wall body 9 is provided in a substantially vertical direction on the opening side of the escape portion 31 of the weight 7 (the rear side of the high-speed tensile testing machine 1). The above-described guide and the correction jig 13 can be attached to the wall body 9.

  4 is a cross-sectional view taken along the line CC of FIG. The correction jig 13 is attached to the wall body 9. The correction jig 13 has a function of correcting the bending of the load cell 11. The number of correction jigs 13 attached may be one or more. It is determined appropriately according to the state of the load cell 11.

  As shown in FIG. 4, the correction jig 13 is smaller than the size of the escape portion 31 of the weight 7. Therefore, even when the weight 7 moves along the guide 5, the weight 7 does not come into contact with the correction jig 13. The details of the correction jig 13 will be described later.

  A shock absorber 17 is provided below the guide 5. The shock absorber 17 absorbs the energy of dropping when the weight 7 is dropped, and prevents the weight 7 and the high-speed tensile test 1 from being damaged.

  In the state of FIG. 1, when a weight dropping device (not shown) is activated (for example, when an electric current such as an electromagnet is cut), the weight 7 falls from a predetermined height due to gravity. As described above, the weight 7 collides with the arm 29 of the test jig 23 and gives energy to the test jig 23. The test piece 21 is pulled by the force applied to the test jig 23. The test piece 21 is deformed by a stress corresponding to the tensile force and then breaks.

  A stress measurement unit (not shown) is provided in the vicinity of the test piece 21 mounting portion of the load cell 11. The stress measuring unit may calculate the stress from the amount of strain generated in the load cell 11 by attaching a strain gauge to the lower end of the load cell 11, for example.

  As for the stress when the test piece 21 is pulled at a high speed, the reaction force is detected by the stress measuring unit of the load cell 11. Therefore, the stress generated in the test piece 21 can be known. The high-speed tensile strength of the test piece 21 can be known from the energy applied by the weight 7 and the stress generated on the test piece 21.

  Next, details of the correction jig 13 will be described. FIG. 5 is a perspective view showing the correction jig 13. The correction jig 13 mainly includes a plate 35, a column body 37, an arm 41, a winding unit 45, and the like. Here, an arrow M direction in the figure is a longitudinal direction of the plate 35. In addition, an arrow N direction in the figure, which is orthogonal to the longitudinal direction of the plate 35, is a width direction of the plate 35.

  The plate 35 is a plate member. The rear end portion in the longitudinal direction of the plate 35 is bent into an L shape. The bent portion is the attachment portion 47. The attachment portion 47 is used for attachment to the wall body 9, and the wall body 9 and the plate 35 are joined directly or via other members.

  At the front end of the plate 35 in the longitudinal direction, arms 41 (41a, 41b) are provided on both sides in the width direction of the plate 35, respectively. A portion surrounded by the arms 41 a and 41 b is a load cell penetrating portion 39. The load cell 11 penetrates the correction jig 13 at the load cell penetration part 39. The arms 41a and 41b are provided with column bodies 37a and 37b that stand in a direction perpendicular to the plate 35, respectively.

  A take-up portion 45b and a knob 43b are provided at the rear in the longitudinal direction of the column body 37a (that is, substantially at the center in the longitudinal direction of the plate 35 and in the vicinity of the end portion in the width direction of the plate 35). The winding portion 45 b is provided toward the front end of the plate 35 in the longitudinal direction. A column body 37c is provided behind the winding portion 45b. In addition, the height of the column 37 (37a, 37b, 37c) is higher than the height of the winding portion 45b.

  On the rear side in the longitudinal direction of the column body 37b (that is, in the vicinity of the rear end in the longitudinal direction of the plate 35 and in the vicinity of the end in the width direction of the plate 35 opposite to the winding portion 45b), 43a is provided. The winding portion 45 a is provided outward in the width direction of the plate 35. In addition, the winding part 45a is provided in a position higher than the winding part 45b.

  When the knob 43a is rotated, the winding unit 45a rotates. For example, when the knob 43a is rotated in the direction of arrow D in the figure, the winding portion 45a rotates in the direction of arrow E in the figure. If the knob 43a is rotated in the reverse direction, the winding part 45a rotates in the reverse direction. Note that the winding portion 45a does not rotate in reverse even when a wire is wound around the winding portion 45a and tension is generated in the wire.

  Similarly, when the knob 43b is rotated, the winding portion 45b is rotated. For example, when the knob 43b is rotated in the direction of arrow F in the figure, the winding portion 45b is rotated in the direction of arrow G in the figure. If the knob 43b is rotated in the reverse direction, the winding portion 45b is rotated in the reverse direction. Note that the winding portion 45b does not rotate in reverse even when a wire is wound around the winding portion 45b and tension is generated in the wire. As the winding part 45 (45a, 45b) and the knob 43 (43a, 43b), a peg used for a stringed instrument or the like can be used.

  Next, a method for using the correction jig 13 will be described. FIG. 6 is a view showing a method of using the correction jig 13.

  First, the case where the load jig 11 penetrating the load cell penetrating portion 39 is bent away from the correction jig 13 in the state where the correction jig 13 is installed on the wall body 9 and the load cell is installed will be described. In this case, it is necessary to pull the load cell 11 toward the correction jig 13 (FIG. 6A).

  A string 49a, which is a wire rod, is joined to the column body 37c. The string 49a is desirably sufficiently smaller than the diameter of the load cell 11, and has no rigidity and has irregularities on the surface. For example, fiber yarn such as kite yarn. If the surface is uneven, the contact area with the load cell 11 can be reduced, and energy can be prevented from leaking along the string 49a. The string 49a is hung from the column body 37c to the outside of the load cell 11 and joined to the winding portion 45a. That is, the load cell 11 is supported by the column body 37c and the winding portion 45a by the string 49a. When the knob 43a is rotated in this state (in the direction of arrow H in the figure), the winding portion 45a rotates and the string 49a is wound around the winding portion 45a. Accordingly, the load cell 11 is pulled in the direction of arrow I by the string 49a. That is, the portion where the string 49 a is hung on the winding portion 45 a and the column body 37 c becomes the correction portion of the load cell 11.

  In order to pull the load cell 11 straight in the direction of the wall body 9, the angle formed by the string 49 a from the load cell 11 to the column body 37 c with respect to the longitudinal direction of the correction jig around the load cell 11, It is desirable that the angle formed by the string 49a to the winding portion 45a is the same.

  Next, the case where the correction jig 13 is installed in the wall body 9 and the load cell 11 is bent in the direction in which the load cell 11 penetrating the load cell penetrating portion 39 approaches the correction jig 13 will be described. In this case, it is necessary to pull the load cell 11 away from the correction jig 13 (FIG. 6B).

  A string 49b, which is a wire rod, is joined to the column body 37c. The string 49b is hung from the column body 37c to the outside of the column body 37a. Further, the string 49b is hung from the column body 37a to the inside of the load cell 11, is hung on the column body 37b, and is joined from the column body 37b to the winding portion 45a. That is, the load cell 11 is supported by the column body 37a and the column body 37b by the string 49b. When the knob 43a is rotated in this state (in the direction of arrow H in the figure), the winding portion 45a rotates and the string 49b is wound around the winding portion 45a. Therefore, the load cell 11 is pulled in the arrow J direction by the string 49b. That is, the portion where the string 49 b is hung on the column body 37 c via the winding portion 45 a and the column bodies 37 a and 37 b becomes the correction section of the load cell 11.

  In order to pull the load cell 11 perpendicularly to the wall body 9, the angle formed by the string 49 b from the load cell 11 to the column body 37 a with respect to the longitudinal direction of the correction jig 13 around the load cell 11, and the load cell It is desirable that the angle formed by the string 49b from 11 to the column 37b is the same.

  Next, the case where the load cell 11 penetrating the load cell penetrating portion 39 is bent to the side with respect to the correction jig 13 in a state where the correction jig 13 is installed on the wall body 9 and the load cell is installed will be described. In this case, it is necessary to pull the load cell 11 laterally with respect to the correction jig 13 (FIG. 6C).

  A string 49c, which is a wire rod, is joined to the column body 37a. The string 49c is hung from the column body 37a to the side of the load cell 11 and joined to the winding portion 45b. That is, the load cell 11 is supported by the column body 37a and the winding portion 45b by the string 49c. When the knob 43b is rotated in this state (in the direction of arrow K in the figure), the winding portion 45b rotates and the string 49c is wound around the winding portion 45b. Therefore, the load cell 11 is pulled in the arrow L direction by the string 49c. That is, the portion where the string 49 c is hung on the winding portion 45 b and the column body 37 a becomes the correction portion of the load cell 11.

  In order to pull the load cell 11 parallel to the wall body 9, an angle formed by the string 49 c from the load cell 11 to the column body 37 a with respect to the width direction of the correction jig 13 around the load cell 11, and the load cell It is desirable that the angle formed by the string 49c from 11 to the winding portion 45b is the same.

  If it is desired to apply a tensile force to the side opposite to that shown in FIG. 6C, the corrective jig 13 is placed on the wall 9 in the opposite direction (downward), and the load cell 11 is similarly pulled by the string 49c. good.

  The pulling direction by the correction jig 13 is the longitudinal direction (FIG. 6A or 6B) and the width direction (FIG. 6C) of the pulling jig 13 and a state in which the correction jig 13 is installed in the opposite direction. ), The load cell 11 can be pulled in any direction. At this time, the strings 49a and 49b to be applied when a tensile force in the longitudinal direction of the correction jig 13 is applied are applied at the height of the winding portion 45a. On the other hand, the string 49c to be applied when applying a tensile force in the width direction of the correction jig 13 is applied at the height of the winding portion 45b. Since the winding portion 45a and the winding portion 45b have different heights, even when tensile forces are applied in two directions perpendicular to each other at the same time, the strings do not interfere with each other.

  In order to surely correct the load cell 11, the laser is irradiated downward from the vicinity of the load cell fastening portion 19 or the string to which the weight is attached is pulled, so that the load cell 11 is straightened in the vertical direction. You can make adjustments while checking whether or not

  As described above, according to the high-speed tensile testing machine 1 according to the embodiment of the present invention, the tensile strength at a high speed of the test piece 21 can be easily and accurately measured. In particular, since the load cell 11 having a long length is used, the influence of the vibration wave (reflected wave) due to the impact applied to the test piece 21 can be prevented.

  Further, if the correction jig 13 is used, the bending of the load cell 11 can be corrected, and the generation of noise due to the bending of the load cell 11 can be suppressed. That is, the axial direction of the load cell 11 and the tensile direction of the test piece 21 and the test piece 21 can be positioned in a straight line direction. Furthermore, since the correction jig 13 corrects the load cell 11 with the string 49 which is a wire, the load cell 11 is not rigidly fixed. Therefore, the load cell 11 is not completely restrained, and vibration waves due to an impact propagating through the load cell 11 are not reflected at the position of the correction jig 13. Therefore, the influence of noise due to the reflected wave can be suppressed.

  Further, according to the correction jig 13, it is possible to suppress the rigid body shake that occurs in the load cell 11 after the test piece 21 is broken.

  The adjustment of the load cell by the correction jig 13 is simple because the string 49 is applied by a predetermined method and then the tension amount of the string 49 is adjusted by the winding unit 45. Correction can be made in any direction perpendicular to the axial direction. Therefore, by adjusting the installation location and the number of the correction jigs 13, the correction direction and the correction amount of the load cell 11 at each installation site of the correction jigs 13, it is ensured that the load cell 11 has any curvature. Can be corrected.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows the high-speed tensile testing machine 1. FIG. It is the A section enlarged view of FIG. 1, and the enlarged view of the test piece 23 vicinity. FIG. 6 is a cross-sectional view taken along line BB in FIG. It is CC sectional view taken on the line of FIG. 1, and sectional drawing of the correction jig 13 vicinity. The perspective view which shows the correction jig | tool 13. FIG. The figure which shows the method of correcting the load cell 11 with the correction jig 13. FIG. The figure which shows the high-speed tension test machine 50. FIG. (A) is the P section enlarged view of FIG. 7, the enlarged view of the test piece 65 vicinity, (b) is a conceptual diagram which shows the noise V. FIG. (A) is a figure which shows the high-speed tensile testing machine 50 which installed the fixing jig 75, (b) is a conceptual diagram which shows the noise X.

Explanation of symbols

1, 50 ......... High-speed tensile tester 3 ......... Base 5 ......... Guide 7 ......... Weight 9 ......... Wall body 11 ......... Load cell 13 ......... Correction jig 15 ......... Top plate 17 ......... Shock absorber 19 ......... Load cell fastening portion 21 ......... Test piece 23 ......... Test jig 25 ......... Pin 27 ......... Pin 29 ......... Arm 31 ......... Escape portion 33 ......... Groove 35 ......... Plates 37a, 37b, 37c ......... Column body 39 ......... Load cell penetrating portions 41a, 41b ......... Arms 43a, 43b ......... Knob 45a, 45b ......... Winding portion 47 ......... Mounting portion 48 ......... Beams 49a, 49b, 49c ......... String 51 ......... Base 53 ......... Guide 55 ......... Load cell 57 ......... Top plate 59 ......... Weight 61 ......... Load cell fastening portion 63 ……… Shock absorber 65 ……… Test piece 67 …… Fixtures 69 ......... pin 71 ......... pin 73 ......... arm 75 ......... fixture

Claims (9)

A jig for correcting load cells used in high-speed tensile testing machines,
Plates,
A load cell penetrating portion provided at the tip of the plate;
First load cell correcting means for applying a force in a direction substantially perpendicular to the axial direction of the load cell to the load cell penetrating the load cell penetrating portion;
A force is applied to the load cell penetrating the load cell penetrating portion in a direction substantially perpendicular to the axial direction of the load cell and substantially perpendicular to the direction of the force applied to the load cell by the first load cell correcting portion. Second load cell correction means
Comprising
A load cell correcting jig, wherein a force can be applied in an arbitrary direction substantially perpendicular to the axial direction of the load cell penetrating the load cell penetrating portion. A pair of arms protruding at the tip of the plate;
A first pillar and a second pillar respectively provided on the pair of arms;
A first winding portion provided behind the first pillar and capable of winding a wire;
A third pillar provided near one side edge on the plate;
A second winding portion provided near the other side end of the plate with respect to the third column body;
Further comprising
The first load cell correcting means has a first wire rod hung on the first winding portion and the first column body,
2. The load cell correcting jig according to claim 1, wherein the second load cell correcting means includes a second wire rod hung on the second winding portion and at least the third column body. 3.   The load cell correction jig according to claim 2, wherein the first wire and the second wire are not rigid and have irregularities on the surface. Base and
A pair of guides standing substantially vertically on the base;
A weight penetrating through the guide, provided with a relief portion at substantially the center, and movable along the guide;
A load cell provided in a substantially vertical direction and penetrating the escape portion;
A wall provided behind the weight;
A load cell correcting jig that is provided in at least one location on the wall and corrects the bending of the load cell;
Comprising
The load cell correcting jig is
A plate, a load cell penetrating portion provided at a tip of the plate, and a first load cell correcting portion that applies a force in a direction substantially perpendicular to the axial direction of the load cell to the load cell penetrating the load cell penetrating portion, A force is applied to the load cell penetrating the load cell penetrating portion in a direction substantially perpendicular to the axial direction of the load cell and substantially perpendicular to the direction of the force applied to the load cell by the first load cell correcting means. Second load cell straightening means, and capable of applying a force in an arbitrary direction substantially perpendicular to the axial direction of the load cell penetrating the load cell penetrating portion. testing machine. The size of the load cell correction jig is smaller than the size of the escape portion.
A pair of arms protruding at the tip of the plate;
A first pillar and a second pillar respectively provided on the pair of arms;
A first winding portion provided behind the first pillar and capable of winding a wire;
A third pillar provided near one side edge on the plate;
A second winding portion provided near the other side end of the plate with respect to the third column body;
Further comprising
The first load cell correcting means has a first wire rod hung on the first winding portion and the first column body,
5. The high-speed tensile testing machine according to claim 4, wherein the second load cell correcting means includes a second wire rod that is hung on the second winding portion and at least the third column body.   6. The high-speed tensile testing machine according to claim 5, wherein the first wire and the second wire are not rigid and have irregularities on the surface. A high-speed tensile test method for materials,
A base, a pair of guides standing in a substantially vertical direction on the base, the guide penetrates, a relief portion is provided at a substantially central position, a weight movable along the guide, and a substantially vertical direction; A load cell correcting jig that corrects the bending of the load cell, having a load cell that penetrates the relief portion, a wall portion provided behind the weight, and at least one location on the wall portion, the load cell penetrating portion at the tip. When,
Using a high-speed tensile testing machine equipped with
While applying a force in a direction substantially perpendicular to the axial direction of the load cell with respect to the load cell that penetrates the load cell through the first load cell correction means provided in the load cell correction jig,
The second load cell correcting means provided in the load cell correcting jig provides the load cell with the first load cell correcting means perpendicular to the substantially axial direction of the load cell with respect to the load cell penetrating the load cell penetrating portion. Applying a force in a direction substantially perpendicular to the direction of the force
A material high-speed tensile test method comprising applying a force to a test piece provided below the load cell by dropping the weight in a state where the bending of the load cell is corrected. The load cell correcting jig is
A pair of arms protruding at the tip of the plate;
A first pillar and a second pillar respectively provided on the pair of arms;
A first winding portion provided behind the first pillar and capable of winding a wire;
A third pillar provided near one side edge on the plate;
A second winding portion provided near the other side end of the plate with respect to the third column body;
Further comprising
The first load cell correcting means is configured to wind the first wire rod that is hung from the first winding portion via the load cell to the first column by the first winding portion. While empowering the load cell,
The second load cell correcting means winds at least the second wire rod hung on the third pillar body from the second winding portion via the load cell by the second winding portion. The material is subjected to a high-speed tensile test method according to claim 8, wherein force is applied to the load cell.   9. The high-speed tensile test method for a material according to claim 8, wherein the first wire and the second wire are not rigid and have irregularities on the surface.

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