JPH083460B2 - Pipe material testing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a material tester using a pipe material as a test piece, and particularly to a material test for a pipe material having a detaching device for detaching the tubular test piece from the core after the test is completed. Regarding the machine.

[Conventional technology]

In the tensile test of a tubular test piece, when the end of the test piece is gripped, the end of the tubular test piece may be crushed or squeezed and may be broken. That is, after inserting the core, this end is gripped by a chuck or the like.

FIG. 4 shows a conventional material testing machine for pipe materials.
The guide frame 2 formed on the upper crosshead 1 has a gripper 3
The gripping tool 3 grips the upper end of the tubular test piece 4. A core main body 5a is inserted into the upper end of the tubular test piece 4, and a core flange 5b formed on the upper end of the core main body 5a is attached to a mounting block 6.
The mounting block 6 is mounted on a piston 9 in a cylinder 8 via a piston rod 7. A stopper 11 is supported by a support block 10 fixed to the upper crosshead 1, and the core 5 slidably penetrates through the stopper 11.

The lower end of the tubular test piece 4 is also gripped in the same manner as described above. A tensile load is applied to the tubular test piece 4 thus gripped, and when the tubular test piece 4 breaks, the gripping tool 3 is released and the core 5 is raised by the piston 9. The tubular test piece 4 also integrally rises as the core 5 moves upward, but when the upper end surface of the test piece abuts on the stopper 11, the tubular test piece 4 is prevented from moving upward, and the core 5 moves. It is pulled out from the tubular test piece 4.

[Problems to be solved by the invention]

However, when testing tubular test pieces having different inner diameters, such a material testing machine for tube materials must replace the core and the stopper with those that match the inner diameters of the tubular test pieces. This replacement work is complicated, and there is a problem that it takes a lot of preparation time to test tubular test pieces of different diameters. Therefore, tubular test pieces with different diameters were not suitable for automatic material testing.

Therefore, an object of the present invention is to provide a pipe material tester capable of facilitating a preparatory operation when testing tubular test pieces having different inner diameters and significantly shortening the preparatory time.

[Means for solving problems]

In order to achieve this object, the present invention provides a core, a core of which is partially inserted into a tubular test piece, and a core flange portion formed at an end of the core. A gripping device for gripping the tubular test piece in which the core is inserted, a drive device that has a mounting block that holds the core flange part, and moves the core in the axial direction after the test, and the core body part. A material test for a pipe material, which is in contact with a side surface, and includes a disengagement device that disengages the tubular test piece from the core body portion by blocking the movement of the tubular test piece when the core is moved by the drive device. In the machine, the detaching device includes a pair of movable stoppers symmetrically arranged with respect to the core, and a moving device that moves these stoppers so as to abut the side surface of the core body during the detaching operation. Have,
The mounting block of the drive unit is provided with a large-diameter space for accommodating the core flange portion and a small-diameter space for accommodating a part of the core main body portion. Is characterized in that it extends from the side surface of the mounting block to the side surface of the mounting block so that the core flange portion and the main body portion can be inserted, and has an opening there.

[Work]

The core is easily attached to and detached from the block through the opening on the side surface of the block. Therefore, when the inner diameters of the tubular test pieces are different, the core replacement time can be significantly shortened.

Further, since the stopper can be moved by the moving device, even if the inner diameter of the tubular test piece is different, it can be dealt with by simply changing the moving amount by the moving device without replacing the stopper itself.

As described above, by shortening the core replacement time and eliminating the need for stopper replacement, it is possible to significantly reduce the test preparation time when the inner diameter of the tubular test piece changes.

〔Example〕

An embodiment of a pipe material testing machine according to the present invention will be described below with reference to FIGS. 1 to 3 in which the same parts as those in FIG. 4 are designated by the same reference numerals.

In FIG. 1, a support base 12 is partially embedded on the upper surface of the upper crosshead 1, and a cylinder 8 is mounted on the support base 12.
Is erected. A guide frame 13 is formed on the lower surface side of the upper crosshead 1, and a gripping device 14 is provided on the guide frame 13. This gripping device 14 includes a pair of gripping tools 14a for gripping the upper end of the tubular test piece 4, and these gripping tools 14a.
And a piston 14b for driving the. At the upper end of the tubular test piece 4, a main body portion 5a of a core 5 having the same outer diameter as the inner diameter of the tubular test piece is inserted, and at the upper end of the core main body portion 5a, a core flange portion 5b. Has been drilled. The core flange portion 5b is housed in a mounting block 15 fixed to the piston rod 7.

FIG. 2 is a perspective view of the mounting block 15 as seen from below, and the block 15 has a core flange portion.
A large-diameter space 15a for accommodating 5b and a small-diameter space 15b for accommodating the core body 5a are formed. Both the large-diameter space 15a and the small-diameter space 15b extend to the side surface of the mounting block 15, and an opening 15c is formed in this side surface. This opening 15c faces the front of the testing machine. Therefore, by inserting the core 5 through the opening 15c, the core flange portion 5b can be housed in the large-diameter space 15a and the core 5 can be attached to the block 15. In addition, both of these voids 15a,
The size of 15b is determined so that the core corresponding to the maximum diameter of the test piece to be tested can be accommodated.

A through hole 12a for inserting the core 5 is formed in the front surface of the support base 12. In addition, a pair of cylinders are provided below the support base 12.
16, 16 are bored in symmetrical positions with respect to the core 5, and pistons 17, 17 are housed in each cylinder 16, 16. This piston 17, 17 is connected to a stopper 18,
18 are fixed. As shown in FIG. 3, the ends of each stopper 18 are formed in parallel. Note that the cylinder
16, 16 and pistons 17, 17 constitute a moving device that moves the stoppers 18, 18 back and forth so as to approach the core 5 and retract from it.

 Next, the operation of the testing machine having such a configuration will be described.

As shown in FIG. 1, the upper end of the tubular test piece 4 in which the core 5 is inserted is gripped by the gripping device 14 and a predetermined tensile load is applied to the test. After completion of this test, the stoppers 18, 18 are moved toward the core 5 by the pistons 17, 17 and brought into contact with the side surface of the core body 5a as shown in FIG. When the core 5 is raised by the piston 9 in this state, the tubular test piece 4 integrally rises with the rise of the core 5, but when the upper end surface contacts the stoppers 18, 18, the rise is blocked. The core 5 is pulled out from the tubular test piece 4.

Next, when testing tubular test pieces with different inner diameters,
The core 5 that has been used so far, the opening 15c of the block 15 and the support 1
After being removed from the mounting block 15 through the two through holes 12a, the core 5 matching the inner diameter of the tubular test piece to be tested is mounted on the block 15 in the reverse operation of removal. Further, in order to remove the tubular test piece 4 from the core 5 after the end of this test, the stoppers 18 and 18 are moved to almost contact with the core 5 and then the core 5 is lifted in the same manner as described above. Good.

In the above embodiment, a pair of stoppers 18 are used,
Multiple pairs may be used.

〔The invention's effect〕

As is clear from the above description, since the stopper according to the present invention can be moved by the moving device, even if the inner diameter of the tubular test piece is different, the moving amount by the moving device can be simply changed without replacing the stopper itself. You can deal with it just by changing it. Further, the core can be easily attached to and detached from the block through the opening on the side surface of the block, and therefore, the replacement time of the core when the inner diameter of the tubular test piece is different can be greatly shortened. In this way, the test preparation time when the inner diameter of the tubular test piece changes can be greatly shortened, and it can be easily incorporated in the process of the automatic material test.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a pipe material testing machine according to the present invention, FIG. 2 is an enlarged perspective view of a mounting block of FIG. 1, and FIG. 3 is FIG. FIG. 4 is a sectional view showing the shape of the stopper, and FIG. 4 is a longitudinal sectional view showing a conventional material testing machine for pipe materials. 4 ... Tubular test piece, 5 ... Core, 5a ... Core body, 5b
...... Core flange part, 8 ...... Cylinder, 9 ...... Piston, 7,8,9 ...... Drive device, 15 ...... Mounting block, 15a ......
Large diameter void, 15b …… Small diameter void, 15c …… Opening, 16,17 ……
Moving device, 18 ... Stopper.

Claims (1)

[Claims] 1. A core comprising a core main body part of which is inserted into a tubular test piece and a core flange part formed at an end of the main body part, and a tubular core into which the core is inserted. A gripping device that grips the test piece, a drive device that has a mounting block that holds the core flange portion, and that moves the core in the axial direction after the test, and abuts on the side surface of the core body portion, In a material testing machine for a pipe material, which comprises a releasing device which prevents the tubular test piece from moving when the core is moved by a drive device and separates the tubular test piece from the core body, Has a pair of movable stoppers symmetrically arranged with respect to the core, and a moving device for moving the stoppers so as to abut the side surface of the core main body at the time of disengagement operation. The mounting block of the above core is Franc A large-diameter space for accommodating a part and a small-diameter space for accommodating a part of the core main body are respectively formed. A pipe material testing machine, characterized in that it extends to the side surface of the mounting block so that the main body can be inserted, and is opened there.