JP2009276122A - Wire rod automatic tensile tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform excellently an automatic tensile test of a wire rod test piece in a bent state. <P>SOLUTION: Both ends of a test piece TP are gripped by gripping devices 31, 32, and the gripping devices 31, 32 are moved in the length direction of the test piece TP by lifting cylinders 33, 34, to thereby apply a tension to the test piece TP. Further, the gripping devices 31, 32 are conveyed to the tester body 5 side by driving of a ball screw 42, while gripping the test piece TP by the gripping devices 31, 32, and the test piece TP is gripped by gripping devices 51, 52 provided on the tester body 5. A loading actuator 53 is driven in this state, to thereby load a tensile force onto the test piece TP. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wire automatic tensile testing apparatus that automatically supplies a wire specimen to a tensile tester main body.

  2. Description of the Related Art Conventionally, there is known an apparatus in which a test piece of a wire is supplied to a test machine main body using an automatic hand device, and the test piece is chucked by the test machine main body to apply a tensile force (for example, a patent). Reference 1). In the apparatus described in Patent Document 1, a wire specimen is gripped by a pair of upper and lower auto hand grips and supplied to a tester main body.

JP 7-333124 A

  However, for example, when a test piece is obtained by cutting a wire wound in a coil shape into a predetermined length, the test piece may be bent and the test piece may not be gripped satisfactorily.

The wire rod automatic tensile testing apparatus according to the present invention conveys to a testing machine main body a bending straightening means for applying a tension to the wire rod test piece to correct the bending of the wire rod test piece, and a bending wire straightened by the bending straightening means. And a load means for applying a tensile test force to the wire specimen transported by the transport means.
It is possible to further include wire rod holding means for holding the wire rod test piece in a bent state, and wire rod supply means for supplying the wire rod test piece held by the holding means to the bending correction means.
A first gripping device that grips both ends of the wire rod test piece, and a moving unit that applies tension to the wire rod test piece by moving the first gripping device in the length direction of the wire rod test piece; The first gripping device is transported to the testing machine main body side while the wire test piece is gripped by the first gripping device, and pulled to the wire test piece via the second gripping device provided in the testing machine main body. Test force can also be applied.
In this case, when the first gripping device grips both ends of the wire test piece on the outer side in the length direction of the wire test piece than the second gripping device, and the second gripping device grips the wire test piece. It is preferable that the gripping force of the first gripping device is released and the first gripping device is retracted from the tester main body side.
The first gripping device is provided with a first gripping member and a second gripping member that sandwich the peripheral surface of the wire test piece, and a groove portion that regulates the position of the wire test piece is provided at the tip of the first gripping member. It is also possible to provide a contact portion that presses the wire specimen against the back of the groove portion at the tip of the second gripping member.

  According to the present invention, a tension is applied to the wire test piece to correct the bending, and the wire test piece with the corrected bending is conveyed to the testing machine main body so as to load the tensile test force, so that the bent state The tensile test of the wire specimen can be performed satisfactorily.

Hereinafter, an embodiment of a wire automatic tensile testing apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing the overall configuration of a wire automatic tensile testing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view (view II view of FIG. 1). For convenience of explanation, front and rear, left and right directions are defined as shown in the figure, and the configuration of each part will be described according to this definition below. The test piece TP to be tested is, for example, a wire test piece obtained by cutting a coiled wire. In the present embodiment, the bending of the test piece TP is automatically corrected and a tensile test is performed. .

  As shown in FIGS. 1 and 2, the wire automatic tensile testing apparatus includes a magazine rack 1 that stocks wire test pieces TP, a rack moving device 2 that moves the magazine rack 1 to a predetermined test piece supply position, and a test piece supply position. The wire rod test piece TP is taken out from the magazine rack 1 moved to the position, and the bending correction device 3 for correcting the bending of the test piece TP by applying tension to the test piece TP, and the test piece whose bending is corrected by the bending correction device 3. A transport device 4 that transports the TP in the left direction in the figure and a tester body 5 that performs a tensile test of the test piece TP transported by the transport device 4 are provided.

  First, the configuration of the magazine rack 1 will be described. 3A and 3B are a side view and a front view showing the overall configuration of the magazine rack 1, and FIG. The magazine rack 1 is constructed by standing a plurality of pipes 10 in a case 11. The case 11 includes a lower support member 12 extending in the left-right direction, a pair of support columns 13 and 14 erected on both left and right ends of the lower support member 12, and an upper portion installed on the upper ends of the support columns 13 and 14. And a support member 15. The pipe 10 is arranged between the left and right support columns 13 and 14, and the upper and lower ends of each pipe 10 are supported through the upper support member 15 and the lower support member 12, respectively. The upper end of the pipe 10 is opened, and the lower end of the pipe 10 is closed.

  As shown in FIG. 3 (b), a pair of pin holes 12a are opened in the left and right ends of the lower support member 12 in the vertical direction. A pair of pin holes 12b are opened. A pin 211 of the chain conveyor 20 and a pin 262 of the lifter 25 described later (FIG. 6) are inserted into the pin holes 12a and 12b, respectively. A plurality of screw holes 16 are formed in the right side surface of the support column 13 in the vertical direction. An identification screw 17 for identifying the magazine rack 1 is attached to the screw hole 16.

  In the pipe 10 of the magazine rack 1 configured as described above, a wire specimen TP having a predetermined length is accommodated and supported as shown in FIG. The length of the test piece TP is longer than the entire length of the pipe 10, and when the test piece TP is inserted from the upper end surface of the pipe 10 to the bottom, the upper end portion of the test piece TP is as shown in the figure. It protrudes from the upper end surface of the pipe 10 in a curved state. The pipe 10 is inserted and fixed in a through hole provided in the upper support member 15, but the through hole is narrowed in the middle to prevent the pipe from being removed, and the upper end of the pipe 10 is located in the middle of the through hole. To do. The inner diameter of the pipe 10 is larger than the inner diameter of the through hole so that the test piece TP inserted from the through hole is not caught on the upper end of the pipe 10.

  The configuration of the rack moving device 2 will be described. FIG. 5A is a plan view showing the configuration of the rack moving device 2, FIG. 5B is a side view (viewed in the direction of arrow V in FIG. 1), and FIG. 6 is VI in FIG. 5B. FIG. As shown in FIG. 5, the rack moving device 2 includes a chain conveyor 20 that moves the rack 1 forward, and a lifter 25 that moves the rack 1 up and down. In FIG. 5A, the rack 1 and the chain 21 of the chain conveyor 20 are not shown.

  The chain conveyor 20 is mounted on the base frame 200 (FIG. 1), and the chain 21 is moved by driving the motor 22. As shown in FIG. 6, a pair of left and right pins 211 project from the surface of the chain 21, the pins 211 are inserted into the pin holes 12 a of the rack 1, and the rack 1 is erected on the chain 21 via the pins 211. ing. As shown in FIG. 5 (b), a plurality of pins 211 project in the front-rear direction, and a plurality of racks 1 are juxtaposed on the chain via these pins 211. In FIG. 5B, the rack 1 is shown in front of and behind the lifter 25, but the rack 1 is arranged behind the lifter 25 in the initial state.

  The lifter 25 is provided at the center in the front-rear direction of the chain conveyor 20. As shown in FIG. 6, the lifter 25 includes an air cylinder 26, a bracket 261 provided at the upper end of the air cylinder 26, a pair of left and right pins 262 projecting from the upper surface of the bracket 261, and left and right of the air cylinder 26. A pair of left and right guide rods 263 disposed on both sides. The guide rod 263 moves up and down following the air cylinder 25 via the bracket 261 and prevents the bracket 261 from tilting. When the air cylinder 26 is extended, the pin 262 is inserted into the pin hole 12b on the bottom surface of the rack 1, and the rack 1 is raised (lifted up) by a predetermined amount ΔL.

  Supports 27 and 28 are erected on both the left and right sides of the lifter 25 so as to sandwich the rack 1. The columns 27 and 28 are erected on the frame 200, and the height of the columns 27 and 28 is substantially equal to the height when the rack 1 is raised by a predetermined amount ΔL. Guide portions 271 and 281 are provided at the upper ends of the columns 27 and 28, respectively. FIG. 7A is a plan view (a view along arrow VII in FIG. 6) showing the configuration of the guide portion 281, and FIG. 7B is a cross-sectional view taken along the line bb in FIG. 7A. The configuration of the guide portion 271 is the same as the configuration of the guide portion 281 and is not shown.

  As shown in FIG. 7A, the guide portion 281 is substantially U-shaped when viewed from above. The dotted line in FIG. 7A indicates the shape of the lower end corner of the guide portion 281, and tapered surfaces 282 and 283 are formed on the inner side surface of the guide portion 281 from the bottom to the top. As a result, the space 284 inside the guide portion 281 is wide at the bottom and narrows toward the top. For this reason, when the rack 1 is raised, the position of the rack 1 in the front-rear and left-right directions is regulated by the guide portion 281 so that the rack 1 can be accurately placed at the test piece supply position.

  As shown in FIG. 5A, a transmissive magazine passage sensor 291 that detects the passage of the rack 1 moving forward by the chain conveyor 20 is attached to the support column 28. When the air cylinder 26 is extended when the magazine passage sensor 291 is turned on, the pin 262 is inserted into the pin hole 12b, and the rack 1 is lifted up.

  In the lift-up state, as will be described later, the test pieces SP are sequentially taken out from the rack 1, and when all the test pieces SP are taken out, the air cylinder 26 is degenerated and the empty rack 1 is lifted down. The empty rack 1 is conveyed to the front of the lifter 25 by the chain conveyor 20. As shown in FIG. 5A, at the front end of the chain conveyor 20, all the test pieces TP are taken out from the rack 1 and the rack 1 is moved in front of the lifter 25, that is, the empty rack 21 is full. An empty rack full sensor 292 to be detected is mounted.

  As shown in FIG. 6, a proximity sensor 293 that detects the presence or absence of the identification screw 17 is attached to each of the columns 27 corresponding to the screw holes 16 provided in the rack 1. In the present embodiment, test pieces TP of the same type having the same wire diameter and material are accommodated in the same rack 1. Therefore, for example, if the mounting position of the identification screw 17 is different for each rack 1, or if the same type of test piece TP is accommodated in a plurality of racks 1, the identification is made for each type of test piece. If the mounting position of the screw 17 is different, the type of the test piece TP for each rack can be identified by the signal from the proximity sensor 293.

  The configuration of the bending correction device 3 will be described. FIG. 8 is an enlarged view of the main part of FIG. 1 showing the configuration of the bending correction device 3, and FIG. 9 is a plan view (an arrow IX view of FIG. 8). The bending correction device 3 includes an upper gripping device 31 and a lower gripping device 32 that grip both upper and lower ends of the test piece TP, a first lifting cylinder 33 that lifts and lowers the upper gripping device 31 relative to the lower gripping device 32, It has the 2nd raising / lowering cylinder 34 which raises / lowers the upper holding apparatus 31 and the lower holding apparatus 32 integrally.

  As shown in FIG. 8, the lower end portion of the cylinder tube 331 of the first elevating cylinder 33 is fixed to the support bracket 35. The upper gripping device 31 is attached to the lower end portion of the cylinder rod 332 of the first elevating cylinder 33, and the lower gripping device 32 is attached to the lower end portion of the support bracket 35. When the first lifting cylinder 33 is extended to the maximum, the upper gripping device 31 is in the lower end position (solid line) close to the lower gripping device 32, and when the first lifting cylinder 34 is retracted to the maximum, the upper gripping device Reference numeral 31 denotes an upper end position (chain line) farthest from the lower gripping device 32. The front ends of the gripping devices 31 and 32 extend horizontally toward the left.

  In front of the support bracket 35, the support frame 40 is erected via a support column 410 (FIG. 11) erected on the base frame 200. The support bracket 35 is supported by a second elevating cylinder 34, and the second elevating cylinder 34 is supported from a support frame 40. Accordingly, when the second elevating cylinder 34 is expanded and contracted, the support bracket 35 and the first cylinder 33 are moved up and down integrally with respect to the support frame 40.

  On the rear surface of the support frame 40, a pair of upper and lower rails 41 extend in the left-right direction. As shown in FIG. 9, a slide member 36 slidable along the upper and lower rails 41 is provided in front of the support bracket 35, and the upper and lower gripping devices 31, 32 and the lifting cylinders 33, 34 connect the slide member 36. And can move in the left-right direction.

  The configuration of the gripping devices 31 and 32 will be described. FIG. 10A is a front view showing a schematic configuration of the lower gripping device 32, and FIG. 10B is a plan view. The configuration of the upper gripping device 31 is the same as that of the lower gripping device 31 and is not shown in the figure. The gripping device 32 includes a front finger 311 and a rear finger 312 that are provided so as to be able to expand and contract in the front-rear direction, and an air chuck 313 that drives the fingers 311 and 312 to expand and contract in the front-rear direction.

  Protruding portions 314 and 315 projecting forward are provided on the upper surface and the lower surface of the rear finger 312, and a recess 316 is formed between the protruding portions 314 and 315. A convex portion 317 is formed on the rear surface of the front finger 311 so as to fit into the concave portion 316. V-shaped grooves 318 are formed on the front surfaces of the protrusions 314 and 315, respectively. The fingers 311 and 312 of the upper gripping device 31 are subjected to V-groove processing for preventing slipping. The gripping force of the lower gripping device 32 can be adjusted by a regulator, and is set to be weaker than the gripping force of the upper gripping device 31.

  As shown in FIG. 8, when the rack 1 is raised by the lifter 25, the upper end surface of the rack 1 approaches the lower gripping device 32. For this reason, even if the upper end portion of the test piece TP is bent, the upper end portion of the test piece TP is located between the front finger 311 and the rear finger 318 as shown in FIG. In this state, when the convex portion 317 of the front finger 311 is fitted to the concave portion 316 of the rear finger 312 by driving the air chuck 313, the test piece TP is formed in the groove 318 by the convex portion 317 as shown in FIG. It is pushed into the back and is sandwiched between the front and rear fingers 311 and 312. In this case, the upper end portion of the test piece TP is pushed into and clamped by the two protrusions 314 and 315 at the upper and lower portions, respectively, whereby the test piece TP can be held straight in the vertical direction.

  As shown in FIG. 11, position detection sensors 391 to 393 for detecting the expansion / contraction position of the cylinder rod 332 are mounted on the surface of the cylinder tube 311 of the first elevating cylinder 33. The position detection sensors 391 to 393 are respectively provided corresponding to the lower end position, the upper end position, and the grip position slightly below the upper end position of the upper gripping device 31, thereby detecting the position of the upper gripping device 31.

  Here, the gripping position is a position at which the test piece TP is gripped by the lower gripping device 32. In the present embodiment, after gripping the upper end portion of the test piece TP at the lower end position and raising the upper gripping device 31 to the gripping position, the lower gripping device 32 grips the lower end portion of the test piece TP and further holds the upper gripping portion. The device 31 is raised to the upper end position. Accordingly, since the gripping force of the lower gripping device 32 is weaker than the gripping force of the upper gripping device 31, the test piece TP is moved between the fingers of the lower gripping device 32 while the upper gripping device 31 rises from the gripping position to the upper end position. It is pulled by the upper gripping device 31 while sliding. As a result, tension is applied to the test piece TP, and the bending of the test piece TP is corrected.

  The configuration of the transport device 4 will be described. As shown in FIG. 11, a ball screw 42 extends in the left-right direction between the upper and lower rails 41. The bend correcting device 3 is provided with a nut 37 between the upper and lower slide members 36, and the nut 37 is attached to the ball screw 42. A pulley 43 is connected to the end of the ball screw 42, and the pulley 43 is connected to a servo motor 45 via a chain 44 as shown in FIG. 9. As a result, when the servo motor 45 rotates, the ball screw 42 rotates through the chain 44 and the pulley 43, and the ball straightening device 3 (the gripping devices 31, 32 and the lifting cylinder 33, through the nut 37 is rotated by the rotation of the ball screw 42. 34) slides in the left-right direction. The servo motor 45 incorporates an encoder that detects the amount of rotation of the motor 45, and the amount of movement of the gripping devices 31 and 32 is controlled by a signal from the encoder.

  The configuration of the test machine body 5 will be described. FIG. 12 is a front view of the tester body 5. The test machine main body 5 applies a tensile force to the test piece TP via the upper gripping device 51 and the lower gripping device 52 that grip the upper end portion and the lower end portion of the test piece TP, and one gripping device (for example, the lower gripping device 52). And a load actuator 53 for loading. The load actuator 53 is composed of, for example, a servo motor, and the lower gripping device 52 moves up and down according to the rotation of the servo motor. Note that the load actuator 53 can also be configured by an air cylinder or the like.

  FIG. 13 is an enlarged view of the gripping devices 51 and 52. The gripping devices 51 and 52 each have a front finger 501 and a rear finger 502, and these fingers 501 and 502 can be expanded and contracted in the front-rear direction via an arm 504 by an air chuck 503. Finger insertion spaces SP are formed inside the arm 504, and the leading ends of the gripping devices 31 and 32 conveyed by the conveying device 4 are inserted into the spaces SP. Thus, both end portions of the test piece TP are gripped by the gripping devices 51 and 52 inside the gripping devices 31 and 32 in the vertical direction.

  FIG. 14 is a block diagram showing a configuration of a wire automatic tensile testing apparatus according to the present embodiment. The controller 60 includes a CPU, ROM, RAM, and other peripheral circuits. The controller 60 includes a magazine passage sensor 291, an empty rack full sensor 292, a proximity sensor 293, position detection sensors 391 to 393, a chain conveyor motor 22, an air cylinder 26, a first elevating cylinder 33, The second elevating cylinder 34, air chucks 313, 323, servo motor 45, air chuck 503, and load actuator 53 are connected.

The main operation of the wire automatic tensile testing apparatus according to the present embodiment will be described.
First, as shown in FIG. 4, a plurality of test pieces TP having a predetermined length are respectively inserted into the pipes of the rack 1. An identification screw 17 is attached to the side surface of each rack 1, and the relationship between the screw 17 and the type of the test piece TP is stored in the controller 60 in advance. Next, as shown in FIG. 5B, the plurality of racks 1 are arranged on the chain conveyor 20 behind the lifter 25 via the pins 211. In the initial state, as shown in FIG. 8, the gripping devices 31 and 32 are located on the rightmost side and the lower side.

  In this state, when a test start switch (not shown) is turned on, the controller 60 drives the chain conveyor motor 22 and the rack 1 is transported forward by the chain conveyor 20. When the passage of the rack 1 above the lifter 25 is detected by the magazine passage sensor 291, the controller 60 stops driving the motor 22 and extends the air cylinder 26. As a result, the rack 1 is pushed up, and the rack 1 moves to the test piece supply position. At this time, since the rack 1 moves up along the guide portions 271 and 281, the rack 1 can be accurately positioned with respect to the bending correction device 3.

  When the rack 1 rises to the test piece supply position, the controller 60 drives the air chuck 323 and grips the upper end portion of the test piece TP with the lower gripping device 32. At this time, since the test piece TP is clamped via the protrusions 314 and 315 at the upper and lower portions of the lower gripping device 32, the test piece TP can be held straight. Next, the controller 60 drives the air chuck 313, grips the upper end portion of the test piece TP with the upper gripping device 31, drives the air chuck 323, and opens the lower gripping device 32. In this case, since the air chuck 313 is driven before the lower gripping device 32 is opened, the upper gripping device 31 can grip the test piece TP in a straight state, and the test piece TP can be easily gripped.

  Thereafter, the controller 60 drives the first elevating cylinder 33 to raise the upper gripping device 31. When the position detection sensor 393 detects a rise of the upper gripping device 31 to the gripping position, the controller 60 drives the air chuck 323 and grips the test piece TP by the lower gripping device 32. In this state, the upper gripping device 31 is further raised to the upper end position. Thereby, tension is applied to the test piece TP, and the bending of the test piece TP can be corrected.

  When the position detection sensor 392 detects a rise to the upper end position of the upper gripping device 31, the controller 60 stops driving the first lifting cylinder 33 and drives the second lifting cylinder 34, The lower gripping device 32 is raised by a predetermined amount. As a result, the test piece TP is completely extracted from the pipe 10, and the upper and lower ends of the test piece TP are held by the holding devices 31 and 32, respectively.

  When the gripping devices 31 and 32 are raised by a predetermined amount by the second elevating cylinder 34, the controller 60 drives the servo motor 45. Thereby, the ball screw 42 rotates and the test piece TP is conveyed to the left along the rail 41 while being held by the holding devices 31 and 32. The controller 60 stores in advance the relationship between the distance from the gripping devices 31 and 32 to the space SP in the gripping devices 51 and 52 and the amount of rotation of the servo motor 45. As shown in FIG. When inserted in the space SP, the controller 60 stops driving the servo motor 45.

  Next, the controller 60 drives the air chuck 503 and grips both ends of the test piece TP by the gripping devices 51 and 52 inside the top and bottom of the gripping devices 31 and 32. When the test piece TP is gripped by the gripping devices 51 and 52, the controller 60 opens the gripping devices 31 and 32, and retracts the gripping devices 31 and 32 to the right side of the tester main body 5 by driving the servo motor 45. In this case, the gripping devices 31 and 32 are not retracted to the original position, but are retracted to the left by one pipe pitch from the position where the next test piece TP is taken out, that is, the original position. Thereby, the test pieces TP can be sequentially taken out from the pipe 10 on the left side.

  When the retraction of the gripping devices 31 and 32 is completed, the controller 60 drives the load actuator 53 to apply a predetermined tensile test force to the test piece TP. The test data at this time is stored in the controller 60. When the test piece TP breaks, the controller 60 opens the gripping devices 51 and 52 and drives a test piece collection device (not shown) to collect the test piece TP after the end of the tensile test.

  When the above procedure is repeated and the test of all the test pieces TP in the rack 1 is completed, the controller 60 lowers the lifter 25. As a result, the empty rack 1 from which all the test pieces TP have been taken out is placed on the chain conveyor 20. Next, the chain conveyor 20 is driven to advance the rack 1. When the passage of the next rack 1 is detected by the magazine passage sensor 291, the lifter 25 is driven, and the test piece TP in the rack is supplied to the tester body 5 in the same procedure as described above.

  When the chain conveyor 2 is driven after the test pieces TP are taken out from all the racks 1, the empty rack full sensor 292 detects the full state of the empty rack 1. As a result, the controller 1 stops driving the motor 22. With the above series of procedures, the test by the wire automatic tensile testing apparatus is completed.

According to the present embodiment, the following operational effects can be achieved.
(1) A bending correction device 3 that applies tension to the test piece TP to correct the bending of the test piece TP, and a transfer device 4 that transfers the test piece TP corrected by the bending correction device 3 to the testing machine main body 5. The wire rod test piece TP transported by the transport device 4 is gripped by the gripping devices 51 and 52 of the tester main body 5, and the tensile test force is loaded by the load actuator 53, so that the wire rod in a bent state Even with the test piece TP, the bending can be corrected and a good tensile test can be performed.
(2) The bent wire specimen TP is held in the pipe 10 provided in the rack 1, and the specimen TP is moved to the specimen supply position via the chain conveyor 20 and the lifter 25. The test piece TP in the bent state can be automatically supplied to the bending correction device 3 easily.

(3) Both ends of the test piece TP are held by the holding devices 31 and 32, and the holding devices 31 and 32 are moved in the length direction of the test piece TP by the elevating cylinders 33 and 34 to apply tension to the test piece TP. I tried to do it. Further, the gripping devices 31 and 32 are transported to the testing machine main body 5 side by driving the ball screw 42 while gripping the test piece TP by the gripping devices 31 and 32, and the gripping devices 51 and 52 provided in the testing machine main body 5 are used. The test piece TP was held. Accordingly, the test piece TP can be automatically supplied to the tester main body 5 in a state where the test piece TP is straightened, and can be gripped on the tester main body 5 side with the test piece TP being straightened.
(4) Since the gripping devices 31 and 32 grip the test piece TP outside the gripping devices 51 and 52 in the length direction of the test strip TP, the gripping devices 51 and 52 correct the bending of the test strip TP. The test piece TP is gripped straight by the gripping devices 51 and 52, and the tensile test can be performed with high accuracy.
(5) When the test piece TP is gripped by the gripping devices 51 and 52, the gripping devices 31 and 32 are opened and the gripping devices 31 and 32 are retracted from the tester body 5 side. The test piece TP can be delivered to the tester main body 5 without contacting the tester main body 32 and the tester main body 5.
(6) The gripping devices 31 and 32 are each provided with a front finger 311 and a rear finger 312, grooves 318 are formed in the upper and lower projections 314 and 315 of the rear finger 312, and the test piece TP is pushed into the groove 318, , 312 sandwiches the peripheral surface of the test piece TP, so that the test piece TP can be held straight.
(7) A plurality of test pieces TP are provided in the rack 1 in the left-right direction, the gripping devices 31, 32 are moved in the left-right direction, the test pieces TP are sequentially taken out, and the chain conveyor 20 is driven in the front-rear direction. The rack 1 was sequentially moved to the test supply device. As a result, a large number of test pieces TP can be efficiently tested in a small space.

  In the above-described embodiment, the bending of the test piece TP is corrected by the bending correction device 3. However, if the bending is corrected by applying tension to the test piece TP, the bending correction is performed as a bending correction means. The configuration of the device 3 is not limited to that described above. As long as the test piece TP whose bending has been corrected by the bending correction device 3 is transferred to the testing machine main body 5, the configuration of the transfer device 4 as the transfer means is not limited to that described above. As long as a tensile test force is applied to the test piece TP transported by the transport device 4, the load means may have any configuration. Although the bent wire specimen TP is held in the rack 1, the configuration of the wire holding means is not limited to that described above. Although the test piece TP held in the rack 1 is supplied to the bending straightening device 3 via the chain conveyor 20 and the lifter 25, the configuration of the wire supply means is not limited to this.

  The configuration of the gripping devices 31 and 32 (first gripping device) provided in the bend correction device 3 and the configuration of the gripping devices 51 and 52 (second gripping device) provided in the testing machine main body 5 are also described above. Not limited to. Although the upper gripping device 31 is moved by driving the first elevating cylinder 33 to apply tension to the test piece TP, other moving means may be used. Although the V-shaped groove 318 is provided at the tip of the rear finger 312 (first gripping member), the groove shape is not limited thereto. Although the test piece TP is pressed against the back of the groove 318 by the tip convex portion 317 of the front finger 311 (second gripping member), the configuration of the contact portion is not limited thereto. That is, as long as the features and functions of the present invention can be realized, the present invention is not limited to the wire automatic tensile testing apparatus of the embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the whole structure of the wire automatic tension test apparatus which concerns on embodiment of this invention. The arrow II figure of FIG. (A), (b) is the side view and front view which respectively show the whole structure of the magazine rack of FIG. The principal part perspective view of the magazine rack of FIG. (A), (b) is the top view and side view which respectively show the structure of the rack moving apparatus of FIG. VI-VI sectional view taken on the line of FIG. (A) is the arrow VII figure of FIG. 6, (b) is the bb sectional view taken on the line of FIG. 7 (a). The principal part enlarged view of FIG. The arrow IX figure of FIG. (A) is a front view which shows schematic structure of a lower holding | grip apparatus, (b), (c) is a top view, respectively. The front view which shows a structure for the whole conveyance apparatus. The front view which shows a structure for the whole testing machine main body. The principal part enlarged view of FIG. The block diagram which shows the structure of the wire automatic tension test apparatus which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magazine rack 2 Rack moving apparatus 3 Bending correction apparatus 4 Conveying apparatus 5 Test machine main body 10 Pipe 20 Chain conveyor 25 Lifter 31 Upper gripping device 32 Lower gripping device 33 First lifting cylinder 34 Second lifting cylinder 51 Upper gripping device 52 Lower gripping Device 53 Load actuator 60 Controller 311 Front finger 312 Rear finger 317 Projection 318 Groove

Claims (5)

A bending correction means for correcting the bending of the wire specimen by applying tension to the wire specimen;
Conveying means for conveying the wire rod test piece whose bending is corrected by the bending correcting means to the testing machine main body,
A wire automatic tensile testing apparatus, comprising load means for applying a tensile test force to the wire specimen transported by the transport means. In the wire automatic tensile test device according to claim 1,
Wire holding means for holding a bent wire specimen;
An automatic wire rod tensile testing apparatus, further comprising: a wire rod supply unit that supplies the wire rod test piece held by the holding unit to the bending correction unit. In the wire automatic tensile testing device according to claim 1 or 2,
The bending correction means is:
A first gripping device for gripping both ends of the wire rod test piece;
Moving means for moving the first gripping device in the length direction of the wire rod test piece and applying tension to the wire rod test piece;
The transport means transports the first gripping device to the testing machine main body side while gripping the wire specimen with the first gripping device,
The wire loading automatic tensile testing apparatus, wherein the loading means loads a tensile test force to the wire specimen through the second gripping device provided in the testing machine main body. In the wire automatic tensile test device according to claim 3,
The first gripping device grips both ends of the wire rod test piece on the outer side in the length direction of the wire rod test piece than the second gripping device,
When the wire specimen is gripped by the second gripping device, the transport means releases the gripping force of the first gripping device and retracts the first gripping device from the tester main body side. An automatic wire tensile tester. In the wire automatic tensile test device according to claim 3 or 4,
The first gripping device includes a first gripping member and a second gripping member that sandwich a peripheral surface of a wire specimen.
A groove for regulating the position of the wire specimen is provided at the tip of the first holding member,
An apparatus for automatically testing a wire rod, wherein a contact portion that presses a wire rod test piece against the back of the groove is provided at a tip portion of the second gripping member.

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