KR101188076B1 - Correcting apparatus for test piece in high speed tensile tester - Google Patents

Abstract

The present invention relates to a plurality of test piece simultaneous calibration apparatus for a high-speed tensile tester, comprising: a side base including a finishing means, a lower base provided at the bottom of the side base, and a lower base installed on at least the test piece; A plurality of test pieces can be processed simultaneously, including a fixing means for fixing two places and a conveying means for reciprocating the fixing means back and forth in such a manner that the drawing operation of the surface of the test piece is performed by the finishing means. Because the front and back of the machine can be automatically machined, a specimen with scales, burrs, etc. is removed completely, which not only contributes to accurate data during tensile testing but also contributes to improved product reliability.

High speed tensile tester, test piece, fixture, guide, roller, fixed rod, finishing work

Description

Specimen calibration device for high speed tensile tester {CORRECTING APPARATUS FOR TEST PIECE IN HIGH SPEED TENSILE TESTER}

1 is a sectional view of the main part showing a state in which a test piece is mounted on a lower stand of a general tensile tester;

2 is a perspective view of a test piece calibration device according to the present invention;

3 is a sectional view showing the main parts of a state in which a test piece of a test piece calibration device according to the present invention is calibrated;

Figure 4 is a perspective view of the main portion showing a state in which the roller is mounted on the front fixing rod and the rear fixing rod according to the present invention, and

Figure 5 is a block diagram showing a change in the position of the test piece in accordance with the transfer of the guide according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Test piece 11: Side base

12: motor 13: upper and lower cylinder

14: moving plate 15: rotary roller

16: sandpaper 21: lower base

22: guide movement cylinder 23: holder

24: guide 25: front retainer

26: roller 27: holder moving cylinder

28: bearing 29: rear fixing rod

30: clamp

The present invention relates to a test piece processing apparatus used in a high speed tensile tester, and in particular, to prevent the slip phenomenon of the test piece due to burrs, scales, etc. formed during processing on the outer surface of the test piece, which is a hot rolled material, A test piece calibration apparatus for a high speed tensile tester configured to obtain numerical data.

Typically, a representative test method used as a mechanical property evaluation technique of a metal material is a tensile test method, through which data such as yield strength, tensile strength, work hardening index, stress coefficient, and uniform elongation can be obtained. The tensile test method applies a tension to the test piece to calculate the above-described mechanical properties, and contributes to the application of steel to the appropriate field based on the mechanical properties.

On the other hand, the tensile test method may be divided into a static tensile test method and a dynamic tensile test method. The static tensile test method is a commonly used method, in which both sides of a test piece are fixed, and at least one of the test pieces is pulled by a predetermined hydraulic device or a screwed screw device to measure mechanical properties at the time of fracture of the test piece.

As the dynamic tensile test method, a high-speed tensile test apparatus is generally used. The tensile test method is a method of tensioning a specimen from a predetermined speed or more, and is mainly used for evaluating dynamic physical properties of a material.

In recent years, due to the development of the automobile industry, the mechanical properties of automobile steel materials due to external impacts and collisions that may occur in automobiles traveling at high speeds are mainly required, and therefore, high-speed tensile tests are preferred to the static tensile tests. to be.

The above-mentioned high speed tensile test apparatus is generally an apparatus for fixing the one end of a test piece and causing the other end to generate a grip action at a predetermined speed or more to evaluate the instantaneous tensile force of the test piece. In other words, the gripping device and the test piece should be spaced at regular intervals before the gripping device is instantaneously gripped at a predetermined speed or more by a predetermined gripping device.

FIG. 1 is a configuration of a lower fixture of a general tensile tester, and is configured on the lower fixture 201. The lower holder 201 is formed in a 'U' shape, the upper end has an elastic that can be retracted by the external pressure. At least one pressing means (tightening means) is provided on both left and right sides of the 'U'-type lower holder 201. The pressing means includes a spring bar 205 having a screw groove formed on an outer circumferential surface thereof and a bolt 204 which is screwed into the spring bar 205 to retract the lower holder 201 according to the fastening degree. More specifically, the end penetrated on the lower holder 201 of the spring bar 205 is fixed to the jaw 206 to be described later.

A jaw 206 formed in an inclined structure having a predetermined inclination for mounting the test piece 100 is installed at the center having a predetermined inclination of the lower holder 201. Preferably, the inclination of the outer surface of the jaw is formed to correspond to the inclination of the inner surface of the lower fixture 201. Accordingly, when the lower holder 201 is tightened by the bolt 204, the jaw 206 is pushed by the inner surface of the lower holder 201 to approach near the outer surface of the test piece 100.

In addition, a wedge 203 having a constant inclination of which the outer surface is tapered is also provided at a position separate from the jaw 206 at the center of the lower holder 201. At this time, the wedge 203 is a slope that can support the jaw 206 to have a predetermined interval not to contact the test piece 100 during the process of tightening the lower holder 201 by the bolt 204 It should be formed to have. Accordingly, when the test piece 100 is positioned at the center of the jaw 206 and installed in the center of the lower fixing base 201 together with the wedge 203 and tightened with the bolt 204, the jaw is formed by the wedge 203. The 206 and the test piece 100 are located up to a close distance but do not come into contact with each other (see the main drawing of FIG. 1).

Thereafter, at least one guide bar 202 is installed at one side or both sides of the lower holder 201. The guide bar 202 is installed on one side of the lower holder 201 in the longitudinal direction, so that the lower holder 201 is a guide when the lower holder 201 moves up and down by a moving cylinder driven by a predetermined hydraulic device. do. In addition, the guide bar 202 is to allow the idle movement through the wedge 203, respectively, and the stepped portion (diameter having a large diameter at a predetermined position so as to be caught on the lower surface of the wedge (203) 207). This causes the wedge 203 to be caught by the stepped portion 207 of the guide bar 202 when the lower holder 201 descends at high speed, thereby temporarily deviating from the lower holder 201, and consequently the jaw 203. In order to be able to gripping the specimen 100 instantaneously. More specifically, when the wedges having different sizes or inclinations are selectively applied to the lower holder, a desired gap (thickness distance) between the jaw 203 and the test piece 100 is desired (t in FIG. 1). It can be adjusted with.

However, since the tensile tester configured as described above should be set so that the distance between the jaws and the test piece is within 0.1 mm, it is easy to work in the case of the cold rolled material, but in the case of the test piece of the hot rolled material, During the test due to scale, burr, warping, etc., slip of the test piece occurs, which results in the failure to obtain accurate tensile force data of the test piece. As a result, the reliability of the material is degraded.

SUMMARY OF THE INVENTION An object of the present invention is to provide a test piece calibration apparatus for a high-speed tensile tester which is configured to ensure accurate data at all times by preventing slip phenomenon of a test piece during a test.

Another object of the present invention is to provide a test piece calibration device for a high-speed tensile tester configured to process a plurality of test pieces at the same time to improve productivity.

In order to solve the above object, the present invention provides a plurality of test piece simultaneous calibration device for a high-speed tensile tester, the side base including the finishing means, the lower base installed in the bottom of the side base, It is installed on the lower base, including a fixing means for fixing at least two places of the test piece and the conveying means for reciprocating the fixing means in the left and right direction so that the finishing operation of the surface of the test piece by the finishing means is performed. It is characterized by.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case where it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

2 is a perspective view of a test piece calibration apparatus according to the present invention, which is installed on the lower base 21 on which the test piece 1 is fixed and on the side surface of the lower base 21 and is mapped onto the upper surface of the fixed test piece 1. And a side base 11 having a finishing means for performing the work.

The lower base 21 is provided with a predetermined fixing 23. The holder 23 is formed in a 'c' shape and the front fixing rod 25 and the rear fixing rod 29 are installed at regular intervals, respectively. The front fixing rod 25 and the rear fixing rod 29 is formed of a plurality of predetermined intervals so that one front fixing rod 25 and one rear fixing rod 29 fix one test piece 1. Will be performed. Therefore, the front fixing rod 25 and the rear fixing rod 29 having a plurality of pairs may fix the plurality of test pieces 1.

The fixture 23 may perform a left and right reciprocating motion. This is to allow the top of the plurality of test pieces to be evenly performed during the finishing operation by the upper finishing means. Therefore, the lower base 21 is provided with a predetermined fixed cylinder moving cylinder 27 to perform the reciprocating movement of the fixed base 23 to a predetermined length.

On the other hand, the side base 11 is provided with sandpaper 16 capable of vertical movement as a finishing means. The sandpaper 16 is wound around at least two rotary rollers 15 and installed to rotate together according to the rotation of the predetermined motor 12. The roller 15 will be installed on the movable plate 14 which is vertically movable by a predetermined upper and lower cylinder 13 on the side base 11.

Furthermore, according to the present invention includes a rotating means for automatically rotating when one surface of the installed test piece (1) is completely processed to rotate the rear surface of the test piece (1). Therefore, the guide 23 having a predetermined length may be penetrated to the holder 23 so as to be movable, and a guide moving cylinder 22 for moving the guide 24 has a predetermined position of the holder 23. Is installed on. Therefore, the front fixing rod 25 and the rear fixing rod 29 will be installed to be rotatable in accordance with the flow of the guide (24). Preferably, the outer circumference of the test piece inserted into the front fixing rod 25 and the rear fixing rod 29 is installed so that a rotating body (predetermined roller 26 or gear) is wound to rotate in conjunction with the guide 24. do. More preferably, the roller 26 may be formed of a rubber material, and in the case of the gearing combination, the roller 26 may be a combination of the rack and the pinion.

3 is a cross-sectional view of the main part showing a state in which a test piece of the test piece calibration device according to the present invention is calibrated, and the test piece 1 according to the present invention passes through the front fixing bar 25 and a part of the rear fixing bar 29. It is fixed in such a way that it is inserted. In order to prevent separation of the test piece 1 during the finishing operation, a predetermined test piece fixing device is installed on the rear fixing rod 29. The test piece fixing device includes a clamp 30 extending to the test piece inserting portion of the rear fixing rod 29 and a test piece insert passing through the outer surface of the rear fixing rod 29 to support the test clamp insert 30. It includes a connection bar 32, the spring 31 is interposed between the connection bar 32 and the fastener 30 to press the fastener 30. The spring 31 may use a compression coil spring. Therefore, the test piece 1 has a configuration in which the clamp 30 presses the end of the test piece 1 when the test piece 1 is inserted by applying a predetermined pressing force to the insertion part of the rear fixing rod 29.

Figure 4 is a perspective view of the main portion showing a state in which the roller is mounted on the front fixed rod and the rear fixed rod according to the present invention, Figure 5 is a configuration diagram showing a position change of the test piece according to the transfer of the guide according to the present invention.

Referring to Figures 2 to 5 the operation of the present invention will be described. First, a plurality of test pieces 1 penetrate through each of the front fixing rods 25 and a part thereof is fixed by inserting the rear fixing rods 29. Thereafter, the moving plate 14 provided with the sandpaper 16 rotated by the rotary roller 15 is lowered to be brought into contact with the upper surface of each of the test pieces 1, and the finishing operation is performed. At this time, the upper surface of the test piece (1) can be carried out evenly while the fixing bar moving cylinder 27 is reciprocating in the left and right direction.

Thereafter, when finishing the finishing operation of the upper surface of the test piece 1 is completed, the moving plate 14 is raised to separate the sandpaper 16 from the upper surface of each test piece 1, and then the guide moving cylinder 22 is operated. The guide 24 is made to flow. The roller 26 rotates according to the flow of the guide 24, and the front fixing rod 25 and the rear fixing rod 29 rotate together with the flow of the guide 24. As a result, the test piece 1 fixed to the front fixing rod 25 and the rear fixing rod 29 is rotated so that the rear surface of the test piece 1 moves to the position of the upper surface. Thereafter, the moving plate 14 is flowed again so that the sandpaper 16 is brought into contact with the test piece 1 to perform the finishing operation.

Obviously, there are many ways within the scope of the claims to modify these embodiments. In other words, there can be many other ways in which the invention may be practiced without departing from the scope of the following claims.

The specimen calibration apparatus according to the present invention can process a plurality of specimens at the same time, and because the front and rear of the specimen can be automatically processed to obtain a specimen completely removed scale, burrs, etc. This ensures accurate data during tensile testing In addition to contributing to this, there is an effect that can contribute to improving the reliability of the product.

Claims (7)

In a plurality of test piece simultaneous calibration device for high speed tensile tester, A side base comprising a finishing means; A lower base installed at the bottom of the side base; Fixing means installed on an upper portion of the lower base to fix at least two portions of the test piece; And It is installed on the upper portion of the lower base, and includes a conveying means for reciprocating the fixing means in the left and right direction to perform the finishing operation of the test piece surface by the finishing means, The mapping means, A moving plate installed on the side base to move vertically; Sandpaper installed on the moving plate and wound to be rotatable by at least two rollers; And An upper and lower cylinder for moving the moving plate vertically to contact the sandpaper during contact with the upper surface of the test piece fixed to the fixing means; The fixing means, A plurality of front fixing rods and rear fixing rods include a fixed fixed distance is installed, The transfer means, And a holder moving cylinder for enabling left and right reciprocating movement of the holder on the lower base, The test piece, And a part of the rear fixing rod penetrating the front fixing rod to be fixed by a predetermined fixing device. delete delete The method of claim 1, The fixing device of the rear fixing rod, Fixing bracket and extending to the test piece insertion portion of the rear fixing rod, A connection bar penetrating from an outer surface of the rear fixing rod to an insertion part to support the fixing bracket; And a spring interposed between the connecting bar and the fastener to pressurize the fastener. The method of claim 1, The fixture is a test piece calibration device for a high-speed tensile tester, characterized in that it further comprises a rotating means for automatically performing the rear processing by rotating the mounted specimen. 6. The method of claim 5, A rotating body installed to wind up the respective front and rear fixing rods; A guide having a predetermined length that is installed to reciprocate by horizontally penetrating the holder, and is installed to rotate the rotating body during the reciprocating motion; And a guide moving cylinder installed at a predetermined position of the holder to reciprocate the guide from side to side. The method according to claim 6, The rotating body is a test piece calibration device for a high-speed tensile tester, characterized in that any one of the pinion, the roller of the rubber material interlocked in the rotary motion according to the left and right reciprocating motion of the guide.

Images