KR101203612B1 - Bending test device - Google Patents

Abstract

The worktable can be easily and conveniently performed in the test piece, and the worktable is moved up and down along the guide bar installed vertically to increase the work efficiency by minimizing the time required for the bending work mechanically sequentially. A pair of movable blocks movably installed along the movable rail formed on the upper surface of the work table and arranged opposite to each other, a support roll installed on each of the movable blocks to support the specimen, and a drive for raising and lowering the work table; A cylinder, an upper plate installed at the upper end of the vertical bar, a pressing roll for firstly pressing the test piece when the work table is elevated and installed on the opposite surface of the movable block, are installed on the upper plate to pressurize the test piece secondly. Pressing plate, installed on the table, the hydraulic chamber for moving the moving block It provides a bending test specimen comprises the more.

Description

Specimen Bending Tester {BENDING TEST DEVICE}

The present invention relates to a test apparatus. More specifically, the present invention relates to a specimen bending test apparatus for testing the plastic deformation of the thick plate and hot rolled plate.

In general, the flexural test is a test to determine the plastic deformation capacity of a metallic material by applying a load to a specimen having a cube or a circular or polygonal cross section under the specified test conditions and bending it until the specified bending angle is reached without changing the load direction.

The bending test is carried out by first pressing down the specimen and bending it in a V shape, and then bending the second specimen by bending it in a U shape. That is, the interval between the supporting rolls on which the specimen is placed is first set according to the specimen to complete the V-shaped primary bending test. However, in the related art, there is no device that can fix the roll down roll during the first bending, so the pressure drop roll must be fixed with one hand and the hydraulic operation lever is moved with the other hand. In addition, the weight of the rolling roll is considerable, and the lifting and lowering of the specimen by more than twice the number of specimens has been a risk factor for workers' fatigue and safety.

After the first bend as described above, the specimen is placed on the upper and lower compression plates, and then the specimen is second-depressed and bent into a U-shape to complete the test. Thus, the plastic deformation capacity of the specimen is confirmed through the bending state of the specimen pressed in the U shape.

Here, during the second pressing, a bending test is performed by inserting a crimping plate to form an inner radius according to the thickness and test conditions of the specimen.

However, the pressing plate is inconvenient to be remanufactured after being used several times, it is difficult to meet the exact bending test conditions when using the damaged plate as it is.

In addition, the conventional structure in the bending test in the manner described above, the operation of the hydraulic supply device, which is the main control equipment, can only be moved from side to side and only up and down, and it is impossible to meet the minute conditions. There is also a risk that the specimen will bounce off during the final crimping operation.

In addition, when setting the support roller interval, the adjustment is performed with the left and right screw type cylinders fastened to the lower motor, but the operation time and the interval adjustment are impossible. It is a major cause of failures and errors.

In addition, the conventional apparatus is a fully passive facility in an analog manner. This makes it difficult to meet flexural test conditions and maintains reproducibility in test conditions and equipment operation. In addition, the work relies on manual labor, which greatly increases the time-consuming waste that must be maintained by the operator at all times until completion of the test.

Accordingly, the present invention provides a specimen bending test apparatus that can easily perform the bending operation of the specimen more easily.

In addition, the bending work is mechanically sequentially provided to provide a specimen bending test apparatus that can minimize the time required for the work to increase the work efficiency.

To this end, the apparatus is a work table that is moved up and down along the guide bar is installed vertically, a pair of movable blocks that are installed to be movable along the movable rail formed on the upper surface of the work table, and disposed opposite to each other, installed on each of the movable blocks A support roll for supporting the test piece, a driving cylinder for lifting and lowering the work table, an upper plate installed at the upper end of the guide bar, and a lowering roll installed at the upper plate to pressurize the test piece when first lifting the work table. And, each of the pressing plate is installed on the opposite surface of the moving block to pressurize the second specimen, may be installed on the table may include a hydraulic cylinder for moving the moving block.

The apparatus may further include a push down roll converting unit for converting the size of the push down roll according to the specimen.

The push-roll converting unit is disposed below the upper plate with a guide rail formed in a direction orthogonal to a moving direction of the moving block, a moving plate moved along the guide rail, and spaced along the longitudinal direction of the moving plate. Another kind of push down roll may be installed on the upper plate and include an operation cylinder for moving the moving plate.

A stopper member for regulating the position of the specimen placed on the support roll may be further installed at the upper end of the movable block.

The movable rail installed at the upper end of the work table may be further formed with a notch path that allows one side to be notched to remove foreign substances therein.

The cutout path may have a size corresponding to the cutout path, and an auxiliary plate for adjusting the top height of the moving rail may be detachably coupled.

According to the present apparatus as described above, the first bending and the second bending work for the specimen is mechanically continuous to simplify the work and reduce the time required for the work.

In addition, it is possible to perform the work more safely and stably to reduce the risk of safety accidents occurring during work.

In addition, the accurate bending test is performed according to the test specimens to increase the reliability of the test results.

1 is a perspective view of a specimen bending test apparatus according to the present embodiment.
2 is a view showing the plane and the front of the specimen bending test apparatus according to this embodiment.
3 and 4 are perspective views showing in detail a part of the configuration of the specimen bending test apparatus according to this embodiment.
5 is a view schematically showing the operation of the specimen bending test apparatus according to this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As can be easily understood by those skilled in the art, the following embodiments may be modified in various forms without departing from the spirit and scope of the present invention and the embodiments described herein. It is not limited to the example.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting.

1 and 2 show the configuration of the specimen bending test apparatus according to this embodiment.

According to the above-described drawings, the apparatus includes a guide bar 12 installed perpendicular to the base plate 10 placed on the ground, a work table 14 which is moved up and down along the guide bar 12, and the work table. (14) A pair of movable blocks 18, which are installed to be movable along the movable rails 16 formed on the upper surface thereof and disposed to face each other, and support rolls 20 which are installed on the movable blocks 18 to support the specimens. ), And a primary bending portion for primary pressing and bending the specimen placed on the support roll 20, and a secondary bending portion for secondary pressing and bending the primary curved specimen.

Four guide bars 12 are vertically installed at each corner of the base plate 10, and the work table 14 penetrates the guide bars 12 so that the guide bars 12 can be moved up and down along the guide bars 12. do.

A driving cylinder 22 is provided between the work table 14 and the base plate 10 to move the work table 14 up and down along the guide bar 12. Accordingly, when the driving cylinder 22 is stretched and operated, the work table 14 is moved up and down to perform the first pressurization operation on the specimen.

The work table 14 is where the bending work of the specimen is made, and a pair of moving rails 16 are installed at the upper end along the longitudinal direction.

The moving rails 16 are disposed on both sides of the moving table 16 with respect to the middle of the work table 14 so as to be movable along the moving rails 16. The movable block 18 is a rectangular block structure, the support roll 20 is installed at the upper edge. The support roll 20 is a member supporting the specimen and is rotatably disposed on the movable block 18 in the width direction of the movable rail 16.

The support roll 20 is installed to protrude slightly above the moving block 18 so that the specimen is placed on the support roll 20. Accordingly, the specimen is supported by both ends supported by the support roll 20 of the movable block 18 spaced apart.

In addition, a stopper member 24 for controlling the position of the specimen placed on the support roll 20 is installed at the upper end of the movable block 18. The stopper member 24 protrudes from the upper end of each moving block 18. When the specimen is brought into close contact with the stopper member 24 and placed on the support roll 20, the specimen is accurately placed in parallel on the moving block 18. Therefore, it is possible to prevent the twisting or springing of the specimen, which may occur when the specimen is placed badly.

On the other hand, the primary bent portion for the primary pressing the specimen is installed on the upper plate 30, the upper plate 30 is installed on the upper guide bar 12, the specimen when the work table 14 is elevated 1 And a rolling roll 40 for pressurizing the vehicle.

When the work table 14 is raised and lowered, the specimen placed on the support roll 20 is pressed by the pressing roll 40 of the upper plate 30 to be primarily curved in a V shape.

Here, the apparatus further includes a pressure reduction roll conversion unit for converting the size of the pressure reduction roll 40 according to the specimen. Specimen bending test is to vary the diameter of the rolling roll 40 to bend the specimen in accordance with the thickness and test conditions of the specimen. Thus, the apparatus can convert the diameter of the pressure reduction roll 40 according to the conditions of the specimen through the pressure reduction roll conversion unit.

To this end, the push-down roll converting unit is a guide rail 32 formed in a direction orthogonal to the moving direction of the moving block 18 below the upper plate 30, and a moving plate moved along the guide rail 32 ( 34), the operation plate 36 is installed on the upper plate 30 to move the movable plate 34, and the different kinds of pressing down at intervals along the longitudinal direction of the movable plate 34 The roll 40 is provided.

FIG. 3 shows different types of push down rolls 40 installed on the movable plate 34.

In this embodiment, the pressing roll conversion unit is provided with five kinds of pressing rolls 40 to match the inner radius of the specimen. The number and characteristics of the rolling rolls 40 are not particularly limited so as to be variously set.

The actuating cylinder 36 moves the moving plate 34 so that the selected lowering roll 40 selected from the plurality of lowering rolls 40 installed on the moving plate 34 is accurately positioned on the support roll 20. It is located. This allows the specimen to bend to the desired radius in accordance with the test conditions.

In addition, the secondary bends are respectively installed on the opposite surfaces of the movable block 18 and the pressing plate 42 for pressurizing the specimen secondaryly, and are installed on the table 14 and connected to each movable block 18 And a hydraulic cylinder 44 for moving the moving block 18 along the moving rail 16.

Accordingly, the test piece pressurized by the pressing roll 40 and bent in a V-shape descends between the pressing plates 42 and is secondly bent in a U-shape by pressing the pressing plate 42.

The pressing plate 42 is detachably coupled to the front of the moving block 18 by a plate or the like through a plate structure. If necessary, the bolt can be easily replaced by loosening the bolt.

The hydraulic cylinder 44 controls the interval between the support rolls 20 on which the specimens are placed by moving the moving block 18 during the primary bending operation, and pressurizes the specimens with the pressing plate 42 for the second time. It works.

On the work table 14, a scale may be further installed to accurately check the distance between the moving blocks 18 moved by the hydraulic cylinder 44. As a result, the gap between the moving blocks 18 moved by the hydraulic cylinder 44 is accurately measured, thereby enabling a more accurate and precise bending test on the specimen.

In addition, as shown in Figure 4, the moving rail 16 is installed on the work table 14, the upper side has a structure in which a notch path 46 is further formed so that one side is cut to remove the foreign matter inside. It is. In the present embodiment, the notch 46 may be formed at an intermediate point between the moving blocks 18. The notch path 46 serves as a passage for discharging various foreign substances introduced between the pair of moving rails 16 arranged at intervals. In the process of bending the specimen, foreign matter may be separated from the specimen and introduced between the moving rails 16. Accordingly, the worker can remove foreign matters through the notch path 46 formed between the movable rails 16.

In addition, the notch path 46 has a size corresponding to that of the notch path, and the auxiliary plate 48 for adjusting the top height of the movable rail 16 may be detachably coupled. The auxiliary plate prevents the cutting path to compensate for the height difference of the moving rail 16. Accordingly, when the auxiliary plate 48 is installed in the notch path 46, the movable rail 16 is continuously extended. In the present device, a thin specimen may be carried out by laying the specimen on the guide rail when the second bend, the auxiliary plate to block the cut path to prevent the specimen from interfering with the cut path.

Hereinafter, the operation of the apparatus will be described with reference to FIG. 5.

This device can operate the switch provided in the control panel to easily set the bending test condition and the specimen condition to perform accurate bending test.

The hydraulic cylinder 44 is driven in accordance with the conditions of the specimen P through the switch operation. When the hydraulic cylinder 44 is driven, the movable block 18 connected to the hydraulic cylinder 44 is moved along the moving rails 16 to space the gap between the support rolls 20 on which the specimen P is placed in accordance with the test conditions. Will be corrected. The test piece P is placed on the support roll 20 in close contact with the stopper member 24 installed on the movable block 18.

And the operation cylinder 36 installed in the upper plate 30 is operated to move the pressing roll 40 set in accordance with the conditions of the specimen over the specimen. When the operation cylinder 36 is driven, the moving plate 34 is moved along the guide rail 32. Accordingly, the pressing roll 40 selected from the plurality of pressing rolls 40 installed on the moving plate 34 can be moved onto the specimen.

When the setting is completed and the test is performed, the drive cylinder 22 is first extended to raise the work table 14. As a result, the specimen is moved toward the pressing roll 40 so that the pressing roll 40 presses the specimen first. As the worktable 14 continues to ascend, the specimen is pressed by the rolling roll 40 and bent in a V shape and lowered below the supporting roll 20 to be placed between the pressing plates 42 in front of the moving block 18. You lose.

As such, when the primary bending is completed, the work table 14 descends and the pressing roll 40 is spaced upwardly from the specimen. The hydraulic cylinder 44 is extended to move the moving block 18 forward.

As the moving block 18 is moved, the gap between the pressing plates 42 installed in the moving block 18 is narrowed, thereby pressing the specimens between the pressing plates 42. Accordingly, the specimen is continuously pressurized by the pressing plate 42 and bent in a U shape.

When the secondary pressurization is completed, the moving block 18 is reversed in accordance with the operation of the hydraulic cylinder 44, the gap between the pressing plate 42 is widened, and the specimen bending work is completed.

In this way, after the V-shaped primary bending test is completed after the specimen is seated on the support roll, the secondary bending test is continuously performed as it is, and is completed until the final reduction. Therefore, the device can always produce the same test results for specimens of the same thickness and test conditions, which improves the reliability of the bending test results.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

12: guide bar 14: work table
16: moving rail 18: moving block
20: support roll 22: driving cylinder
24: stopper member 30: upper plate
32: guide rail 34: moving plate
36: working cylinder 40: push down roll
42: crimp plate 44: hydraulic cylinder

Claims (4)

A work table that is moved up and down along a guide bar installed vertically,
A driving cylinder for raising and lowering the work table,
A pair of movable blocks which are installed to be movable along the movable rail formed on the upper surface of the work table and disposed to face each other;
A support roll installed on each of the movable blocks to support the specimen;
An upper plate installed at the top of the guide bar,
A rolling roll installed on the upper plate to pressurize the specimen first when the work table is lifted,
Press plates that are respectively installed on the opposite surface of the moving block to pressurize the specimen second,
Hydraulic cylinder installed on the work table for moving the moving block
Specimen bending test apparatus comprising a. The method of claim 1,
Further comprising a pressure reduction roll conversion unit for converting the size of the pressure reduction roll,
The rolling roll converting unit is a guide rail formed in a direction orthogonal to a moving direction of the moving block below the upper plate, a moving plate moved along the guide rail, and installed on the upper plate to move the moving plate. Specimens bending test apparatus having a cylinder, the structure is provided with a different type of rolling rolls at intervals along the longitudinal direction of the movable plate. The method according to claim 1 or 2,
The movable block is a specimen bending test apparatus further comprises a stopper member for controlling the position of the specimen placed on the support roll is installed on the top. The method of claim 3, wherein
The moving rail is a test piece bending device to form a notch path that is one side is cut off foreign matter discharge passage.

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