JP2013190369A - Dimension measurement positioning device and dimension measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimension measurement positioning device and a dimension measurement device for positioning a test piece at a dimension measurement position to a dimension measurement head with simple structure.SOLUTION: A dimension measurement positioning device includes: a chuck 40 which vertically moves by drive of an air cylinder 51; an elevation guide member 52 connected to the chuck 40; and air cylinders 61 and 71 formed by connecting stoppers 62 and 72 to the tip of a piston rod. The chuck 40 is constituted of: a body part 41; and pawl members 43 disposed to fingers 42 which are a pair of opening/closing members.

Description

  The present invention relates to a test piece measuring and positioning device and a measuring device which are arranged at a position to measure a test piece when measuring the size of a test piece to be tested by a material testing machine.

  In a material test for quality evaluation of steel materials, synthetic resin materials, etc., a test piece to be used for the test is a base material cut out of a size corresponding to the test content. At this time, if the width or thickness of the test piece is different from the set value, an error occurs in the test result. For this reason, prior to executing the material test, a dimensioning process for measuring the thickness and width of the test piece is executed. If the dimension error of the test piece is a certain value or more as a result of the measurement, the test piece is recognized as being unsuitable for the material test and excluded from the test object.

  Thus, when measuring the thickness and width of a test piece, a measuring device is used. This measuring device measures the thickness of a test piece by, for example, sandwiching a test piece between a pair of measurement elements and measuring the distance between the measurement elements (see Patent Document 1).

  For example, when a plastic bending test (JIS K 7171) is performed, the thickness of three test pieces is measured by a measuring device. Moreover, when performing a tensile test (JIS K 7162), the thickness of a total of three places of the center of a test piece and two gauge points used as an elongation measurement point is measured with the measuring device. In the conventional measuring device described in Patent Document 1, the measuring head on which the measuring element is arranged is configured to be movable in two directions by a biaxial moving mechanism, and the test is performed by moving the measuring head. Measurement of three points on a piece is possible.

  FIG. 4 is a schematic diagram for explaining how the thicknesses of three points of a test piece are measured by a conventional measuring device. FIG. 4A is a side view showing a state in which the measuring head 30 has moved to the measurement position of the test piece, and FIG. 4B shows measurement of the three points of the test piece from the standby position. It is a top view which shows a mode that it moves to a point sequentially.

  As shown to Fig.4 (a), a measuring device is provided with the measuring head 30 for measuring the thickness of a test piece. The measuring head 30 has an upper arm 32 and a lower arm 33 that respectively support a pair of measuring indenters 31, and either or both of the upper arm 32 and the lower arm 33 are moved up and down to perform a test. The piece can be held by a pair of dimensioning indenters 31. In the conventional measuring apparatus, as shown in FIG. 4B, the measuring head 30 is moved in two directions, the X direction and the Y direction, with respect to the test piece supported by a support member (not shown). That is, the measuring head 30 is moved from the standby position to a position where the test piece can be clamped by the pair of measuring indenters 31 by the moving mechanism in the X direction, and the measuring head 30 is moved to each position of the test piece by the moving mechanism in the Y direction. It is moved sequentially to the measurement point.

Japanese Patent Laid-Open No. 11-23206

  However, the two-axis moving mechanism of the measuring head 30 is constituted by a motor and a guide member built in the measuring head 30, and accurately positions the pair of measuring indenters 31 at the thickness measurement points of the test piece. Therefore, it is necessary to strictly control the drive of the motor that moves the measuring head 30. For this reason, in the measuring apparatus which moves the measuring head 30 with respect to the three thickness measuring points of a test piece, there existed a problem that motor control became complicated. Further, in order to realize such biaxial movement, the number of parts tends to increase.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a measurement positioning device and a measurement device that can position a test piece at a measurement position with respect to a measurement head while having a simple configuration. The purpose is to provide.

  The invention according to claim 1 is a measuring and positioning apparatus for a test piece in a measuring apparatus for measuring a dimension of a test piece to be tested by a material testing machine, and a pair of support members for placing the test piece and the support A pair of opening and closing members that move between a sandwiching position that sandwiches both ends of the test piece placed on the member and a retracted position that is separated from the test piece; and the opening and closing member that is disposed in each of the pair of opening and closing members. When the pair of opening and closing members are moved to the holding position, a plurality of contact surfaces that contact both ends of the test piece are formed and the extension from the opening and closing members is changed. A chuck having a pair of claw members whose shapes facing each other are complementary to each other, a lifting mechanism for lifting and lowering the chuck, and a plurality of stoppers for adjusting the height position of the chuck by contacting the chuck When Characterized in that it comprises a.

  The invention according to claim 2 is the invention according to claim 1, wherein the claw member has a three-step staircase shape, and the pair of opening and closing members has a three-step staircase shape of the claw member. The stoppers are arranged opposite to each other, and the plurality of stoppers are arranged at a height position interval corresponding to one step of a three-step shape of the claw member, and the height position of the chuck is set to the claw. It adjusts to the height position corresponding to every step of the three-step staircase shape of the member.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lifting mechanism moves the chuck up and down by an air cylinder.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the stopper is connected to a tip of a piston rod of an air cylinder, and the piston rod is extended and contracted to the chuck. It moves to the contact position and the standby position.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the chuck is a pneumatically driven air chuck.

  The invention described in claim 6 is a measuring device including the measuring positioning device according to any one of claims 1 to 5.

  According to the first aspect of the present invention, a plurality of contact surfaces that contact both ends of the test piece are formed, and the pair of claw members whose shapes extending in the extending direction from the opening / closing member are complementary to each other; By providing a lifting mechanism and a plurality of stoppers that adjust the height position of the chuck, the position of the test piece relative to the measuring head can be adjusted to the height of the chuck even if there are multiple places where the dimensions of the test piece should be measured. It can be easily changed by changing the position. In this way, it is possible to position the test piece to the measurement position with a simple configuration.

  According to the second aspect of the present invention, the claw member having a three-step staircase shape is provided, and the claw member is formed into a pair of opening / closing members so that the three-step staircase shape is opposite to each other. By arranging the three contact surfaces on both ends of the test piece, it is easy to position the test piece with respect to the measuring head when measuring three points of the test piece. It becomes possible to change.

  According to the third aspect of the present invention, since the lifting mechanism lifts and lowers the chuck by the air cylinder, power consumption and noise can be reduced.

  According to the fourth aspect of the present invention, the stopper is connected to the tip of the piston rod of the air cylinder, and moves to the chuck contact position and the standby position by the expansion and contraction of the piston rod. However, the height position of the chuck can be adjusted.

  According to the fifth aspect of the present invention, since the chuck is a pneumatically driven air chuck, power consumption and noise can be reduced.

  According to the invention described in claim 6, it is not necessary to provide a complicated movement control mechanism for moving the measuring head, and even when there are a plurality of locations where the dimensions are to be measured in the test piece, while having a simple configuration, It is possible to position the test piece to the measurement position and execute dimension measurement at a plurality of locations.

It is a schematic diagram of the material testing machine provided with the measuring device 3 concerning this invention. It is a side surface schematic diagram which shows typically the measurement positioning apparatus in the measurement apparatus 3. FIG. It is a plane schematic diagram which shows typically positioning operation of test piece TP. It is explanatory drawing which shows typically the measuring operation in the conventional measuring apparatus.

  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 provided with a dimension measuring device 3 according to the present invention.

  This material testing machine is composed of a testing machine main body 1, a test piece supply device 2 and a measurement device 3, and measures a plurality of test pieces TP such as plastics accommodated in the test piece supply device 2 one by one. Until the test machine main body 1 is arranged, it is automatically performed by machine operation.

  A pair of frames 12 are erected on the base 18 of the testing machine main body 1, and a pair of screw rods that are rotated in synchronization by a drive mechanism (not shown) are disposed in the frame 12. A nut provided in the cross head 11 is screwed onto the screw rod, and the cross head 11 moves up and down by the rotation of the screw rod. The raising / lowering operation of the cross head 11 is controlled by a control circuit 17 connected to the testing machine main body 1.

  In this testing machine main body 1, an upper grip 14 is connected to a crosshead 11 via a load cell 16 that detects a test force, and a lower grip 15 is disposed on a base 18. The tensile test is performed by raising the crosshead 11 with respect to the test piece TP gripped at both ends by the lower gripping tool 15. In addition, when the support stand which can place test piece TP horizontally is arrange | positioned in the base 18, and the indenter for a bending test is connected to the crosshead 11, the crosshead 11 is lowered | hung, and it becomes a test piece TP. On the other hand, it is possible to perform a bending test.

  The test strip supply apparatus 2 accommodates a plurality of test strips TP to be used for a test, and transports a test strip TP one by one, for example, a transport robot such as a transport robot that sucks and holds the test strip TP with a suction pad (not shown). ) To the measuring device 3.

  The measuring device 3 performs the measurement of the dimension of the test piece TP, and mainly measures the thickness of the test piece TP. The measuring device 3 is provided with a measuring head (not shown). Similar to the measuring head 30 shown in FIG. 4, an upper arm 32 and a lower arm for supporting a pair of measuring indenters 31, respectively. Arm 33. However, the measuring head in this embodiment does not include a motor inside like the conventional measuring head 30 and does not move in two directions by a biaxial moving mechanism. That is, the measuring head moving mechanism in this embodiment can move only in one direction, which is the X direction in FIG. The test piece TP whose thickness is measured by the measuring device 3 and whose thickness is within the specified range is transferred from the measuring device 3 to the upper grip 14 of the testing machine main body 1 by the transport mechanism of the test piece supply device 2. And it is conveyed to the holding position of the test piece TP by the lower gripping tool 15.

  FIG. 2 is a schematic side view schematically showing the measurement positioning device in the measurement device 3.

  When measuring the thickness of the test piece TP with the measurement head in the measurement apparatus 3, the measurement positioning device is placed on the pair of support members 37 according to the position of the thickness measurement point of the test piece TP. This is for changing the position of the test piece TP. This sizing and positioning apparatus includes a chuck 40 that moves up and down by driving an air cylinder 51, an elevating guide member 52 connected to the chuck 40, and air cylinders 61 and 71 having stoppers 62 and 72 connected to the tips of piston rods. Is provided. The air cylinder 51 and the raising / lowering guide member 52 comprise the raising / lowering mechanism of this invention.

  The chuck 40 includes a main body 41 and a claw member 43 disposed on a finger 42 which is a pair of opening / closing members. The chuck 40 is a pneumatically driven air chuck. The main body 41 has a pair of fingers 42, a gripping position for gripping the test piece TP supported by the support member 37 by the claw member 43, and the test piece TP. Air pressure is supplied for horizontal movement (moving in the left-right direction on the paper surface of FIG. 2) between the retracted position and the retracted position.

  The claw member 43 has contact surfaces 44a, 44b that abut against both ends of the test piece TP when the pair of opening and closing members 42 are moved to the clamping position by varying the extension length from the finger 42 in stages. 44c is formed. The claw member 43 has a three-step (upper, middle, lower) step shape when viewed from the side surfaces of the contact surfaces 44 a, 44 b, 44 c, and the claw member 43 disposed on one finger 42. The claw member 43 disposed on the other finger 42 is such that the shape of the three steps is opposite to each other so that the shapes facing the extending direction from each finger 42 are complementary to each other. It has become. Note that the shapes facing the extending direction from the fingers 42 are complementary to each other, for example, when the pair of fingers 42 are brought close to each other until the contact surfaces 44a, 44b, 44c come into contact with each other, one of the opening / closing members 42 The contact surfaces 44 a, 44 b, 44 c at the same height position of the claw member 43 provided on the other finger 42 and the claw member 43 provided on the other finger 42 are in close contact with each other. The sum of the extended length of the claw member 43 and the extended length of the claw member 43 from the other opening / closing member 42 is the same at each height position.

  The air cylinders 61 and 71 are arranged up and down along the lifting shaft of the chuck 40. By pushing the stoppers 62 and 72 connected to the tip of each piston rod by air pressure, the stoppers 62 and 72 are moved. The chuck 40 is disposed at the abutting position where it abuts on the rising end of the main body 41, so that the chuck 40 does not rise to a higher position. When the stopper 72 is in contact with the chuck 40, the chuck 40 is disposed at a height position indicated by a solid line in FIG. Further, when both the stoppers 62 and 72 are disposed at a standby position where the stoppers 62 and 72 are not in contact with the chuck 40, the chuck 40 is a position corresponding to the stroke end of the piston rod of the air cylinder 51 that raises and lowers the chuck 40. That is, it is arranged at a height position indicated by a two-dot chain phantom line in FIG. When the stopper 62 is in contact with the chuck 40, the chuck 40 is disposed at an intermediate height position between a height indicated by a solid line and a height indicated by an imaginary line in FIG. The

  The stoppers 62 and 72 are disposed at a height interval of one step of the three-step stair shape of the claw member 43 described above, and the claw member 43 depends on which of the stoppers 62 and 72 contacts the chuck 40. When the finger 42 moves from the retracted position to the gripping position for gripping the test piece TP, the pair that touches both ends of the test piece TP The structure can be changed to the contact surface 44a located in the upper stage and the contact surface 44b located in the middle stage.

  Next, an operation for positioning and measuring the test piece TP by the measuring device 3 including the measuring and positioning device configured as described above will be described. FIG. 3 is a schematic plan view schematically showing the measurement positioning operation. FIG. 3A shows a state where both ends of the test piece TP are brought into contact with the upper contact surface 44a of the claw member 43 and the test piece TP is moved to a position where the thickness of the measurement point A is measured. In FIG. 3B, both ends of the test piece TP are brought into contact with the middle contact surface 44b of the claw member 43, and the test piece TP is moved to a position where the thickness of the measurement point B at the center of the test piece TP is measured. Indicates the state of the FIG. 3C shows a state in which both ends of the test piece TP are brought into contact with the lower contact surface 44 c of the claw member 43 and the test piece TP is moved to a position where the thickness of the measurement point C is measured.

  When performing a measuring operation for measuring the thickness of three locations (measurement point A, measurement point B, measurement point C) of the test piece TP, first, the test piece TP is carried into the measurement device 3 shown in FIG. As shown in FIG. 2, it is placed on a pair of support members 37. At this time, the air cylinder 71 is driven to push the stopper 72 to the contact position on the chuck 40 side. When the chuck 40 is raised by the air cylinder 51, the rising end of the main body 41 of the chuck 40 comes into contact with the stopper 72, and the raising of the chuck 40 is stopped. As a result, of the contact surfaces 44 a, 44 b, 44 c formed on the claw member 43, the height of the chuck 40 is set to a height position where the contact surface 44 a positioned on the upper stage can be contacted to grip the test piece TP. The position has been adjusted.

  When the adjustment of the height position of the chuck 40 is completed, air pressure is supplied to the main body 41 of the chuck 40, and the pair of fingers 42 are moved from the retracted position separated from the test piece TP to the holding position for holding the test piece TP. Let When the pair of fingers 42 move to the gripping position, as shown in FIG. 3A, the upper contact surfaces 44a of the claw member 43 abut against both ends of the test piece TP and are measured by the measurement indenter 31 of the measuring head. The test piece TP is positioned at the measurement position with respect to the measurement head so that the test piece TP can be sandwiched at the point A.

  When the test piece TP is positioned at the measurement position for measuring the thickness of the first measurement point A, the pair of fingers 42 move to the retracted position, and then the upper arm 32 and the lower arm of the measurement head. 33 is moved so as to sandwich the test piece TP. Then, the pair of upper and lower measurement indenters 31 come into contact with the test piece TP, and the thickness of the measurement point A is measured.

  When the thickness measurement of the first measurement point A is completed and the upper arm 32 and the lower arm 33 of the measuring head are moved to a position where the test piece TP is released, the air cylinder 71 is driven and the stopper 72 is moved to the standby position. At the same time, the air cylinder 61 is driven to push the stopper 62 to the contact position. When the chuck 40 is raised by the air cylinder 51, the rising end of the main body 41 of the chuck 40 comes into contact with the stopper 62, and the raising of the chuck 40 is stopped. As a result, of the contact surfaces 44a, 44b, 44c formed on the claw member 43, the contact surface 44b located in the middle stage is brought into contact with the height of the chuck 40 so that the test piece TP can be gripped. The position has been adjusted.

  When the adjustment of the height position of the chuck 40 is completed, air pressure is supplied to the main body 41 of the chuck 40, and the pair of fingers 42 are moved from the retracted position separated from the test piece TP to the holding position for holding the test piece TP. Let When the pair of fingers 42 move to the gripping position, as shown in FIG. 3B, the middle contact surface 44 b of the claw member 43 contacts both ends of the test piece TP and slides on the support member 37. In this way, by measuring the position of the test piece TP supported by the support member 37 by causing the contact surface 44b of the middle stage of the claw member 43 to come into contact with both ends of the test piece TP, measurement is performed by the pair of measurement indenters 31. The test piece TP is positioned at the measurement position where the test piece TP can be sandwiched at the point B.

  When the test piece TP is positioned at the measurement position for measuring the thickness of the second measurement point B, the pair of fingers 42 move to the retracted position, and then the upper arm 32 and the lower arm of the measurement head. 33 is moved so as to sandwich the test piece TP. Then, the pair of upper and lower measurement indenters 31 come into contact with the test piece TP, and the thickness of the measurement point B is measured.

  When the thickness measurement at the second measurement point B is completed and the upper arm 32 and the lower arm 33 of the measuring head are moved to a position where the test piece TP is released, the air cylinder 61 is driven and the stopper 62 is moved to the standby position. Retreat. Then, the chuck 40 is raised by the air cylinder 51. Then, the chuck 40 is raised until the stroke end of the piston rod of the air cylinder 51 is reached. As a result, of the contact surfaces 44 a, 44 b, 44 c formed on the claw member 43, the height of the chuck 40 is set to a height position at which the contact surface 44 c positioned at the lower stage can be contacted to grip the test piece TP. The position has been adjusted.

  When the adjustment of the height position of the chuck 40 is completed, air pressure is supplied to the main body 41 of the chuck 40, and the pair of fingers 42 are moved from the retracted position separated from the test piece TP to the holding position for holding the test piece TP. Let When the pair of fingers 42 move to the gripping position, as shown in FIG. 3C, the lower contact surfaces 44c of the claw member 43 abut against both ends of the test piece TP so that the test piece TP moves on the support member 37. Move the slide. In this way, the lower contact surface 44c of the claw member 43 is brought into contact with both ends of the test piece TP, and the position of the test piece TP supported by the support member 37 is shifted, whereby measurement is performed by the pair of measurement indenters 31. The test piece TP is positioned at the measurement position where the test piece TP can be sandwiched at the point C.

  When the test piece TP is positioned at the measurement position for measuring the thickness of the third measurement point C, the pair of fingers 42 move to the retracted position, and then the upper arm 32 and the lower arm of the measurement head. 33 is moved so as to sandwich the test piece TP. Then, the pair of upper and lower measurement indenters 31 come into contact with the test piece TP, and the thickness of the measurement point C is measured.

  When the measurement of the thickness of the three locations of the test piece TP is completed, the test piece TP is carried out of the measuring device 3 by a transport mechanism (not shown).

  In this embodiment, although the case where the thickness of three places of the test piece TP was measured was demonstrated, by changing the number of steps of the step shape of the claw member 43 and the distance between the contact surfaces formed for each step. Various multipoint measurements according to the number of thickness measurement points and the distance between the thickness measurement points are possible. In addition, what is necessary is just to increase the number of the air cylinder which connects a stopper and a stopper, when increasing the step number of the step shape of the nail | claw member 43. FIG.

  In the measuring device provided with the measuring and positioning device having the above-described configuration, when the test piece TP has a plurality of measurement points where thickness measurement is to be performed, complicated motor control for moving the measuring head 2 is required. Even without providing an axis moving mechanism, it is possible to measure the thickness at a plurality of measurement points by sequentially moving the test piece TP with respect to the measuring head with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Test machine main body 2 Test piece supply apparatus 3 Measuring apparatus 11 Cross head 12 Frame 14 Upper gripping tool 15 Lower gripping tool 16 Load cell 17 Control circuit 18 Base 30 Measuring head 31 Measuring indenter 32 Upper arm 33 Lower arm 37 Support Member 40 Air chuck 41 Body portion 42 Finger 43 Claw member 44a, 44b, 44c Contact surface 51 Air cylinder 61 Air cylinder 62 Stopper 71 Air cylinder 72 Stopper A Measuring point B Measuring point C Measuring point TP Test piece

Claims (6)

In the measurement positioning device of the test piece in the measurement device that measures the size of the test piece to be tested by the material testing machine
A pair of support members for placing the test piece;
A pair of opening and closing members that move between a sandwiching position that sandwiches both ends of the test piece placed on the support member and a retracted position that is spaced apart from the test piece; and each of the pair of opening and closing members, A plurality of contact surfaces that contact both ends of the test piece when the pair of opening and closing members are moved to the clamping position by changing the extension length from the opening and closing members in stages are formed from the opening and closing members. A pair of claw members whose shapes facing the extending direction are complementary to each other,
An elevating mechanism for elevating the chuck;
A plurality of stoppers for adjusting the height position of the chuck by contacting the chuck;
A sizing and positioning apparatus comprising: In the dimensioning and positioning apparatus according to claim 1,
The claw member has a three-step staircase shape,
In the pair of opening and closing members, the three-step staircase shape of the claw member is disposed opposite to each other,
The plurality of stoppers are arranged at a height position interval of one step of the three-step staircase shape of the claw member, and the height position of the chuck is set for each step of the three-step staircase shape of the claw member. Dimensional positioning device that adjusts to the corresponding height position. In the dimensioning positioning apparatus according to claim 1 or 2,
The elevating mechanism is a dimensioning and positioning device that elevates and lowers the chuck by an air cylinder. In the dimensioning positioning apparatus according to any one of claims 1 to 3,
The stopper is connected to a tip of a piston rod of an air cylinder, and is moved to a contact position with the chuck and a standby position by expansion and contraction of the piston rod. In the dimensioning positioning apparatus according to any one of claims 1 to 4,
The chuck is a sizing and positioning device that is a pneumatically driven air chuck.   A dimensioning device comprising the dimensioning and positioning device according to any one of claims 1 to 5.

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