KR101601396B1 - Jig for universal testing machine - Google Patents

Abstract

A universal material testing machine fixture is disclosed. This universal material testing machine fixture is a jig of a general-purpose material testing machine for testing the physical properties of a specimen by pressing a specimen fixed by a fixing portion through a driving portion. The jig of the general-purpose material testing machine has a first connecting portion, one end of which is connected to the driving portion, A first support having a center of gravity at a support point of the specimen and a second support having a center of gravity at the support point of the specimen and a transmission axis which is a virtual axis connecting the center of gravity to a point at which a driving force is generated by the center of gravity, An upper jig including a first turning part for allowing the other end of the first connecting part and the first supporting part to be rotatably connected; And a lower jig having one end connected to the fixing portion and the other end supporting a second end of the specimen. This makes it possible to prevent the deformation of the specimen which may occur during the material test and the deformation of the inside of the specimen by providing a universal material testing machine fixture which can match the specimen shaft with the transmission shaft of the general material testing machine, The deviation and error can be reduced, and the reliability of the measured data can be increased by precise measurement of the specimen. In addition, it is possible to fix various types of specimens stably without slippage and clearance through the ∩ shaped support member and the fixing member capable of adjusting the height, so that the constraint on the shape and size of the specimen can be reduced.

Description

{JIG FOR UNIVERSAL TESTING MACHINE}

More particularly, the present invention relates to a general-purpose material testing machine and an upper jig for fixing an upper portion of a specimen to be coupled by a turning portion, By being fixed to the lower jig by aligning in the vertical direction, it is possible to reduce errors and variations in measurement of physical properties due to bending and twisting occurring in testing materials such as tensile or compression tests of a general-purpose material testing machine. .

In general, a universal testing machine (UTM) is to replace the grips that hold the specimens according to the test. After mounting the environmental chambers, , Various data such as tensile strength, tensile strength, flexural strength and compressive strength as well as peel strength, COF (static friction, dynamic friction coefficient), IFD, ILD Shall mean a test apparatus which is constructed to

Such a universal material testing machine is used to measure the physical properties of various materials in various fields and is also used to measure properties such as tensile strength, compressive strength and endurance limit of materials such as medical syringes in detail.

The physical property measurement test of a medical syringe is generally carried out in order to determine the force required to dispense the injection from the syringe, the data of force versus time, the maximum load and the load value at a particular position of the syringe plunger, And the average load indicating the force necessary to maintain a uniform flow of the injection liquid.

Such physical property measurement has a problem that the shape of the grip portion of the jig must be provided according to a syringe having various sizes and shapes.

In addition, various jigs provided according to the shape of various specimens may be displaced from the transmission axis of the pressing force of the specimen shaft of the jig combined with the specimen depending on the shape of the specimen when the specimen is combined with the specimen.

Since the specimen is constrained by the transmission axis, alignment with the transmission axis depends entirely on the alignment error that occurs when the transmission axis is installed. Therefore, when the transfer axis is not aligned with the transfer axis, the driving direction of the specimen axis and the transfer axis is shifted to generate bending and twisting shearing stresses. As a result, the measured data There is a problem that the reliability of the apparatus is deteriorated.

The most ideal method is to carry out the experiment under the condition that the tester itself is perfectly aligned with the transfer axis, but there is a limit to the misalignment tolerance that can be maintained at all times due to frequent replacement of the load cell in various conditions and environments. have.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-described problems, and an object of the present invention is to provide a method of manufacturing a test specimen, which comprises a supporting part for fixing a specimen and a transmission shaft for transmitting a driving force, Of the material to be tested.

Another object of the present invention is to provide a universal fixture capable of reducing the constraint upon fixing the shape of a specimen provided by a syringe.

In order to achieve the above object, a jig for a general-purpose material testing machine syringe according to an embodiment of the present invention is a jig for a general-purpose material testing machine for testing physical properties of a specimen by pressing a specimen fixed by a fixing portion through a driving portion, A first support part having one end connected to the driving part, a first support part supporting one end of the specimen and having a center of gravity at a support point of the specimen, and a second support part having a center of gravity at which the driving force is generated by the driving part, An upper jig including a first turning part for rotatably connecting the other end of the first connecting part and the first supporting part such that a test axis of the specimen is aligned with a transmission axis which is a virtual axis to be connected; And a lower jig having one end connected to the fixing portion and the other end supporting a second end of the specimen.

The syringe is inserted into the insertion groove, and the protrusion is inserted into the insertion hole, and the protrusion is inserted into the insertion groove, A first support member for supporting the syringe by being seated at the entrance of the groove; And a first fixing member, one end of which is connected to the first rotation unit, and the other end of which is passed through the first support member and contacts the syringe so that the force of the driving unit is transmitted to the syringe.

The second supporting portion may be formed in a cylindrical shape such that a surface of the second supporting portion that is in contact with the other end of the specimen corresponds to the shape of the other end of the specimen so that the clearance between the specimen and the second supporting portion is removed.

The lower jig may include a second connection part having one end connected to the fixing part; And a second turning part that rotatably connects the other end of the second connecting part and the second supporting part such that a force applied by the driving part is transmitted in the longitudinal direction of the specimen.

In addition, the first connecting portion and the first turning portion, and the second connecting portion and the second turning portion may be coupled by a ball joint, respectively.

This makes it possible to prevent the deformation of the specimen which may occur during the material test and the deformation of the inside of the specimen by providing a universal material testing machine fixture which can match the specimen shaft with the transmission shaft of the general material testing machine, The deviation and error can be reduced, and the reliability of the measured data can be increased by precise measurement of the specimen.

In addition, it is possible to fix various types of specimens stably without slippage and clearance through the ∩ shaped support member and the fixing member capable of adjusting the height, so that the constraint on the shape and size of the specimen can be reduced.

1 is a perspective view of a general-purpose material testing machine equipped with a fixture according to an embodiment of the present invention,
2 is a perspective view of a general purpose material testing machine fixture according to an embodiment of the present invention,
3 is a front sectional view of a general-purpose material testing machine fixture according to an embodiment of the present invention,
FIG. 4 is a state diagram showing a state in which a syringe, which is a specimen, is mounted on an upper jig of a universal material testing machine jig according to an embodiment of the present invention,
5 is a use state diagram showing that a transfer shaft and a specimen shaft are aligned with a specimen syringe mounted on an upper jig and a lower jig of a universal material testing machine jig according to an embodiment of the present invention,
6 is a front sectional view of a general purpose material testing machine fixture further comprising a second rotary part on a lower jig according to another embodiment of the present invention, and
7 is a use state diagram of a universal material testing machine fixture further comprising a second rotary part on a lower jig according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

The jig 100 of the universal material testing machine according to the present embodiment is configured such that the center of gravity G of the upper jig 110 of the universal material testing machine is set to coincide with the transmission axis A1 to which the driving force is transmitted, The transmission axis A1 and the specimen axis A2 can be aligned by the center of gravity G of the transmission axis A1 so that the measurement of the physical properties of the specimen T It is possible to provide a function of preventing the deformation of the specimen T and the nonuniform deformation in the specimen T and thereby reducing the deviation and error of the measured physical properties.

1 is a perspective view of a general-purpose material testing machine according to an embodiment of the present invention.

1, a general-purpose material testing machine according to an embodiment of the present invention includes a pressing device 10, a driving device 20, an operating device 30, and a test piece T for property measurement, And a fixture 100 for fixing the fixture 100.

The universal material testing machine is operated by the operating device 30 and the driving force generated by the driving device 20 is transmitted to the pressing device 10 by the operation of the operating device 30, And has a function of moving a load along a path and adding a load to the specimen T fixed by the fixture 100. [

The pressurizing device 10 is composed of a pressurizing part which moves along the axis with the ball screw extending vertically and which is coupled to the jig 100 to apply a load to the test piece T and a guide part which guides the movement path of the pressurizing part, A load of a preset magnitude and a predetermined direction are applied to the test piece T connected to the test piece 100.

The driving device 20 is a device for generating a driving force from a load device composed of a servo motor and a speed reducer and transmitting a driving force to the pressing device 10, and various types of load devices such as a hydraulic type and servo motor type of a static material testing device can be used .

The operating device 30 provides a function of controlling the operation of the driving device 20 and functions to display to the user the operating state of the universal material testing machine or to display and store the measured properties of the material to the user .

The fixture 100 is attached to the pressurizing device 10 in order to fix the specimen T for measuring the physical properties and the fixture 100 having various functions and shapes is provided according to various types of the specimen T .

FIG. 2 is a perspective view of a general purpose material testing machine jig according to an embodiment of the present invention, and FIG. 3 is a front sectional view of a general material testing machine jig according to an embodiment of the present invention.

2 and 3, a jig 100 coupled to the pressurizing device 10 to fix the test piece T is composed of an upper jig 110 and a lower jig 120. As shown in FIG.

The upper jig 110 is connected to the driving unit 15 at one end of the pressurizing device 10 and includes a first connecting part 112, a first turning part 114 and a first supporting part 116, And transmits the driving force generated in the driving unit 20 to the test piece T by connecting the test piece 10 and the test piece T. [

The first connection part 112 is located on the upper part of the upper jig 110 and is coupled to the driving part 15 which is a protruding end of the pressing device 10 so that the upper jig 110 is fixed to the pressing device 10. [ Thereby transmitting the driving force transmitted from the driving unit 15 to the lower portion.

The first turning part 114 is rotatably coupled between the first connecting part 112 and the first supporting part 116 so that the driving force transmitted through the driving part 15 is transmitted to the test piece T. [ At this time, the specimen axis A2 coincides with the transmission axis A1 in correspondence with the transmission axis A1 by the rotation of the first axis portion 114, so that the specimen axis A2 and the transmission axis A1 The alignment error can be eliminated.

The first support portion 116 is composed of a first support member 116a and a first fixing member 116b, an insertion groove 116c and a fixing handle 116d to fix one end of the test piece T. [

In the embodiment of the present invention, the shape of the specimen T is limited to the medical syringe T.

The first support member 116a is formed with an insertion groove 116c in the shape of an inverted U shape so that the handle of the injector T as the specimen T is inserted and mounted, So that one end of the syringe T forms a supporting point at which the upper jig 110 can be supported.

One end of the first fixing member 116b is integrally coupled to the first turning portion 114 and the other end of the first fixing member 116b is inserted into the first support member 116a through a bolt connection and is inserted into the first support member 116a By pressing and fixing the upper portion of the syringe T, the fulcrum of the syringe T together with the first support member 116a is formed.

The fixing knob 116d is formed on the side surface of the first fixing member 116b and rotated by the user's manipulation so that the first fixing member 116b is inserted into the through hole formed in the center of the & And the needle of the syringe T is fixed to the first support portion 116 by pressing the upper portion of the syringe T supported by the inserting groove 116c.

At this time, since the first support member 116a has a symmetrical structure on one side and an asymmetric structure on the other side, the supporting point where the test piece T is fixed by the first fixing member 116b, that is, The center of gravity G can be formed at a supporting point located on an extension line of the center of gravity G.

The upper jig 110 is configured such that the driving force is transmitted to the test piece T through the first connection part 112, the first rotation part 114, and the first support part 116.

The shape of the first support portion 116 is formed so that the center of gravity G can be formed at the support point formed by the first support member 116a and the first fixing member 116b of the test piece T, 1 The transfer shaft A1 which is a virtual axis connecting the point G to the point where the load is transferred from the drive unit 15 is connected to the specimen shaft of the specimen T by the center of gravity G of the support portion 116 A2). ≪ / RTI > The center of gravity of the first support part 116 is set to be greater than a predetermined value so that the weight of the first support part 116 is greater than the weight of the test piece T so as not to be affected by the weight of the test piece T.

The lower jig 120 includes a second support portion 122 connected to the fixing portion 25 which is one surface of the driving unit 20 constituting the lower body of the universal material testing machine. The other end is fixed so that a load can be applied in the longitudinal direction of the syringe T when a load is applied to one end of the syringe T.

The second support portion 122 fixes the other end of the specimen T and is composed of a second support member 122a and a second fixing member 122b.

The second support member 122a has a lower portion coupled to the fixing portion 25 and extended to the upper portion so that both ends of the second support member 122a are protruded in the direction of the syringe T, So that the other end of the specimen T can be supported.

The second fixing member 122b is mounted on the second supporting member 122a in such a manner that the second fixing member 122b is inserted into the protruding portion protruding from the both ends of the second supporting member 122a through bolts and moves symmetrically from both ends of the second supporting member 122a to the center, So that the body portion of the syringe T, which is the specimen T, is pressed and supported from both sides.

The surface of the second fixing member 122b which is in contact with the body of the syringe T serving as the specimen T is provided in a cylindrical shape corresponding to the shape of the body portion of the syringe T, It is possible to securely fix the syringe T to the lower jig 120 or to provide a planar shape so as to prevent the fixing constraint according to the shape of the various syringes T It can alleviate.

The lower jig 120 supports the other end of the specimen T having the transfer axis A1 and the specimen axis A2 aligned with each other in the upper jig 110 so that the transfer jig A1 and the specimen axis A2) and the fixed axes are aligned so that the load for measuring the properties can be applied to both ends of the specimen (T) in the direction of the specimen axis (A2).

As described above, the specimen T is supported at both ends by the upper and lower jigs 110 and 120, so that both ends of the specimen T are supported, and a load such as tensile or compression is applied to the specimen T to measure necessary properties .

The support portion or the grip portion corresponding to the shape of the grip portion of the syringe T for fixing the syringe T which is the specimen T is shown in the present embodiment. However, this is merely an example, It is of course possible to apply known fixing elements.

A test procedure of a test piece using the general-purpose material testing apparatus jig 100 according to an embodiment of the present invention having the above-described structure will be described as follows.

FIG. 4 is a state view showing a state in which a syringe as a specimen is mounted on an upper jig of a universal material testing machine jig according to an embodiment of the present invention, Fig. 5 is a state diagram showing that the transfer shaft and the specimen shaft coincide with the specimen syringe attached to the upper jig and the lower jig of the material testing machine jig.

4 and 5, a general-purpose material testing machine according to an embodiment of the present invention includes a pressing device 10, a driving device 20, an operating device 30, and a jig 100, (T) by applying a load to a specimen (T) fixed to the jig (100) by transmitting the driving force generated by the driving device (20) along the pressing device (10) The desired physical properties are measured.

The upper jig 110 and the lower jig 120 of the universal material testing machine fixture 100 are connected to both ends of the specimen T to fix the specimen T thereto. The shape of the upper jig 110 and the lower jig 120 corresponds to the shapes of both ends of the syringe T as the specimen T. In one embodiment of the present invention, So that a load is applied to both ends of the specimen T.

At this time, the extension of the transmission axis A1 to which the driving force of the universal material testing machine is transmitted and the specimen axis A2 of the specimen T fixed by the jig 100 may include a predetermined error. That is, due to the misalignment of the respective axes, both ends of the specimen T may be deformed due to bending or twisting, and errors or deviations may occur when measuring the physical properties of the specimen T due to non-uniform deformation.

Therefore, the center of gravity G of the transmission shaft A1 may be provided on the extension line of the transmission axis A1 so as to eliminate a predetermined error caused by misalignment between the transmission axis A1 and the specimen axis A2. And the transmission axis A1 and the specimen axis A2 are pivotally coupled to the first pivot portion 114 provided with the ball joint so that the specimen axis A2 is moved by the center of gravity G of the transmission axis A1, Is aligned with the transmission axis A1.

4 and 5, the first rotary part 114 provided by the ball joint is coupled by the first fixing member 116b and is rotated within the first connection part 112. As shown in FIGS. 4 and 5, It is possible to rotate three axes with a high degree of freedom at a certain angle around each axis in the dimensional space.

Therefore, the first fixing member 116b and the first supporting portion 116 formed by the first turning portion 114 are set so that the center of gravity G is formed on the extension line of the transmission shaft A1, When the specimen T is attached to the first support portion 116 by the connection of the driving shaft to the driving shaft 112 and the specimen T is mounted on the first supporting portion 116, And the specimen axis (A2) of the specimen (T) coincide with each other.

At this time, the weight of the drive shaft is set to be larger than the weight of the test piece T by a predetermined weight so that the center of gravity G of the drive shaft is not affected by the mounting of the test piece T.

Thereby, the specimen shaft A2 automatically adjusts its center of gravity G by gravity and coincides with the transmission axis A1, so that the optimum axial load can be applied to the specimen T.

The first support member 116a having the insertion groove 116c into which the handle of the syringe T is inserted so that the shape of the first support portion 116 corresponds to the shape of the handle of the syringe T which is the specimen T, A first support portion 116 including a first fixing member 116b that is bolted to the first support member 116a and presses and fixes the handle of the syringe inserted into the first support member 116a, So that one end of the specimen T can be fixed to the upper jig 110 by the operation of the fixing knob 116d so as to be provided on the jig 110. [

The second support member 122a and the second support member 122a, both ends of which protrude toward the specimen T, so that the shape of the second support portion 122 corresponds to the shape of the syringe T, And a second fixing member 122b which is symmetrically coupled to the protruded both side ends of the test piece 122a and is coupled to be horizontally moved so as to press the other end of the test piece T from both sides, The second support portion 122 is provided on the lower jig 120 so that the other end of the test piece T can be fixed to the lower jig 120. [

The surface of the second fixing member 122b contacting the test piece T may be a cylindrical shape corresponding to the shape of the test piece T so that the other end of the test piece T can be firmly engaged, And may be provided in a flat surface so as to be compatible with the shape of the substrate.

Thereby, the syringe T having various types of knobs can be stably placed in the upper jig 110 with the first support member 116a in the shape of a U shape and the first fixing member 116b in which the height can be adjusted, It can be fixed and measured. In addition, the lower jig 120 is provided with a left-right symmetrical structure in which the balance of left and right weights is constant, so that it is possible to perform precise measurement without errors and deviations in physical property measurement through a constant balance of the jig itself.

The other end of the test piece T coupled to the transmission axis A1 is fixed to the lower jig 120 when the test piece A2 and the transmission axis A1 are aligned with each other, And the specimen axis A2 coincides with the transmission axis A1 that transmits the driving force. When the lower end of the specimen T is fixed to the lower jig 120, the first rotary part 114 is fixed together with the lower end of the specimen T so that no bending or twisting occurs. Therefore, And serves as a connecting joint.

Therefore, when the transmission axis A1 and the specimen axis A2 coincide with each other and a physical property test of the material is performed, the axial load with no bending or twist through the transmission axis A1 and the specimen axis A2 The error and deviation of the measured physical properties can be reduced.

The upper jig 110 is rotatable in three directions by the first rotary part 114 provided in the ball joint, and can rotate in the horizontal direction. The initial bending and torsional load generated between the upper jig 110 and the lower jig 120 can be accommodated when the lower portion of the syringe T as the specimen T is fixed by the lower jig 120. [

In addition, the unexpected unevenness of the transmission axis A1 and the specimen axis A2 may cause deformation of the specimen T or uneven deformation of the specimen T. However, since the drive shaft, which is one end of the transmission axis A1, By being pivotally coupled by the pivot portion 114, it is possible to prevent deformation of one end of the specimen T due to the predetermined mismatch and uneven deformation inside.

By applying an axial load to the specimen T, the physical properties of the material can be tested through a general-purpose material testing machine. The operation and control of the general-purpose material testing machine and the measured physical properties are displayed and stored to the user through the manipulating device 30 The operation of the universal material testing machine is completed.

FIG. 6 is a front cross-sectional view of a general purpose material testing machine fixture further comprising a second rotary part on a lower jig according to another embodiment of the present invention, and FIG. 7 is a cross sectional view showing a second rotary part on a lower jig according to another embodiment of the present invention It is a state of use of a general purpose material testing machine jig which is further provided.

6 and 7, in another embodiment of the present invention, one end of the specimen T is fixed and the other end is pressed to apply an axial load to the specimen T, as in the embodiment of the present invention A universal material testing machine fixture 100 capable of applying a load to both ends by providing a transmission shaft A1 including an upper drive shaft and a lower fixed shaft or by providing an upper drive shaft and a lower drive shaft is provided, So that the load can be applied.

To this end, the lower jig 220 is connected to a pressurizing device (not shown) provided at one end of the lower jig 220. The lower jig 220 is composed of a second connecting part 222, a second turning part 224 and a second supporting part 226, And transmits the generated driving force to the test piece T.

The second connection unit 222 is located below the lower jig 220 and is coupled to a driving unit (not shown) of a pressing device (not shown) provided at the lower part of the lower jig 220 to fix the lower jig 220 to the lower pressing device, The driving force transmitted from the driving unit is transmitted to the upper part.

The second rotary part 224 is rotatably coupled between the second connection part 222 and the second support part 226 so that the driving force transmitted through the driving part (not shown) is transmitted to the test piece T.

The second support portion 226 may be provided corresponding to the shape of the other end of the specimen T and may be provided in a shape capable of supporting the axial load of the specimen T.

The second jig 220 is provided with the second connecting part 222, the second turning part 224 and the second supporting part 226 so that the specimen axis A2 and the transmitting axis The bending or twisting due to an unexpected misalignment between the specimen axis A2 and the transmission axis A1 during the tensile test can be accommodated in the fixture 100 by pivotally connecting the test piece A1.

The bending or twisting caused by the misalignment between the specimen axis A2 and the transmission axis A1 is caused by the high degree of freedom of the three-axis rotation of the pivot portions 114 and 224 provided in the ball joint, So that only the longitudinal axial load of the specimen T can be added to the specimen T. [

Therefore, it is possible to prevent the deformation of the specimen (T) or the uneven deformation of the specimen (T) during the tensile test, thereby reducing the deviation and error of the measured physical properties, thereby enhancing the reliability of the material test.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

10: pressure device 20: drive device
30: operating device 100: jig
15: driving part 25:
110: upper jig 112: first connection part
114: first rotating part 116: first supporting part
116a: first supporting member 116b: first fixing member
116c: insertion groove 116d: fixed knob
120: lower jig 122: second support portion
122a: second supporting member 122b: second fixing member
220: lower jig 222: second connection portion
224: second rotary part 226: second support part
A1: Transfer axis A2: Specimen axis
G: Center of gravity T: Specimen

Claims (5)

A jig of a general-purpose material testing machine provided with a specimen having a plate-like protrusion formed on its upper end, wherein the specimen is tested by pressing a specimen fixed by a fixing part through a driving part,
A first support part having one end connected to the driving part, a first support part supporting one end of the specimen and having a center of gravity at a support point of the specimen, and a second support part having a center of gravity at which the driving force is generated by the driving part, An upper jig including a first turning part for rotatably connecting the other end of the first connecting part and the first supporting part such that a test axis of the specimen is aligned with a transmission axis serving as a virtual axis for connection; And
And a lower jig having one end connected to the fixing part and the other end supporting a second end of the specimen,
The first support member includes a first support member formed with an insertion groove having a diameter smaller than that of the plate-like protrusion of the syringe, the first support member supporting the syringe by being inserted and seated in the protrusion, A first fixing member that is connected to the first supporting member and is connected to the syringe through the first supporting member so that the force of the driving unit is transmitted to the syringe; And a fixing knob that is lowered along the thread of the through-hole to press and press the protruding portion inserted and seated in the insertion groove, thereby pressing and fixing the upper end of the syringe,
Wherein the second support portion comprises a second support member and a second fixation member for fixing the lower portion of the syringe, and the second fixation member is bolted to both ends of the second support member and is mounted in a pair, Wherein the syringe body is symmetrically movable from both ends of the second support member to a central portion thereof so that the body portion of the syringe is pressed and fixed from both sides. delete delete The method according to claim 1,
The lower jig includes a second connection part having one end connected to the fixing part,
Further comprising a second turning portion for pivotally connecting the other end of the second connecting portion and the second supporting portion so that a force applied by the driving portion is transmitted in the longitudinal direction of the specimen. . 5. The method of claim 4,
Wherein the first connecting portion and the first turning portion, and the second connecting portion and the second turning portion are respectively coupled to each other by a ball joint.

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