KR100456558B1 - Apparatus for testing tension and fatigue under high temperature condition using reflection furnace - Google Patents

Abstract

The present invention relates to a high-temperature tensile and fatigue test apparatus using a reflection furnace, and to concentrate the light radiated from a plurality of light sources instead of a heating furnace resistance furnace to heat the specimen through the reflector to concentrate the light only heating the specimen By adopting the reflection furnace, it is possible to reduce the volume compared to the existing resistance furnace with firebrick and heat insulator, and there is no need to replace the hot wire and incur additional cost, and only the specimen is heated. The present invention relates to a high temperature tensile and fatigue test apparatus using a reflector that can significantly reduce the time required for rod and specimen grip made of a heat resistant alloy material and can significantly shorten the time to reach high temperatures.

Description

Apparatus for testing tension and fatigue under high temperature condition using reflection furnace}

The present invention relates to a high-temperature tensile and fatigue test apparatus using a reflection furnace, and more particularly to heat only the specimen by concentrating the light emitted from a plurality of light sources through the reflector instead of the resistance wire of the heating method for heating the specimen. By adopting the configured reflection furnace of the light-intensive heating method, it is possible to reduce the volume compared to the existing resistance furnace with the refractory bricks and the insulator, and there is no replacement of the hot wire and there is no additional cost, and only the specimen is heated. The present invention relates to a high temperature tensile and fatigue test apparatus using a reflection furnace that can significantly reduce the time required for high temperature resistant rods and specimen grips as well as a high temperature reach time.

In general, the evaluation of physical properties of materials used in the manufacture of high-temperature parts of a vehicle, such as engine parts or exhaust manifolds, that are operated at high temperatures, is a research task that must be preceded in terms of product quality and reliability. Tensile and fatigue tests at the temperature at which the component operates are one of the most important test items.

The tensile and fatigue tests at such a high temperature are first equipped with a high temperature furnace by wrapping a test specimen of a test object pre-mounted in a universal test machine (UTM), that is, a tensile and fatigue test apparatus, and then mounting the specimen through the high temperature furnace. After stabilizing by heating to a predetermined temperature, the tensile and fatigue characteristics of the specimen were evaluated.

In particular, in the existing tensile and fatigue test apparatus, a resistance wire of a heating method for heating a heating wire as a high temperature furnace for heating a specimen is used. It shows the state that the resistance furnace is attached.

As shown in the drawing, the test specimen 7 is a high heat resistant rod of the upper and lower sides installed up and down from the upper body (not shown) and the lower body (not shown) of the test apparatus 1, respectively. It is mounted to the test position by (4a, 4b) and the specimen grips 5a, 5b at the tip thereof, and the resistance passage 10 is mounted on the test apparatus 1 so as to surround the specimen 7.

Here, the resistance furnace 10 takes a method of raising the temperature of the furnace itself by generating a heating wire having a large resistance. Looking at the configuration, as shown in FIG. The configured cylindrical housing 11 and a plurality of heating wires are installed to surround the rods 4a and 4b, the specimen grips 5a and 5b and the specimen 7 in the center of the housing 11. It includes a cylindrical heating portion 12 provided, and a refractory brick 13 and a heat insulator 14 installed to surround the heating portion 12 in the housing 11 to maintain the temperature.

However, the tensile and fatigue test apparatus employing the resistance path of the above structure has the following problems.

1) Since the firebrick and the heat insulator surrounding the heating part are built in the housing, there is a disadvantage in that the entire volume of the resistor is increased, which makes it difficult and inconvenient to remove / mount the resistor.

2) Periodic hot wire replacement is necessary due to oxidation of the hot wire itself, which incurs additional cost and hassle to perform new temperature calibration every time the hot wire is replaced.

3) As the furnace itself is heated, it takes a long time for the specimen to reach a certain temperature and direct heating of the rod and specimen grip inserted into the heating part makes it possible to There is a disadvantage in that rod and specimen grips are required.

Accordingly, the present invention has been invented to solve the above problems, the light concentrator configured to heat only the specimen by concentrating the light emitted from a plurality of light sources through the reflector instead of the resistance of the heating wire heating method for the specimen heating; By adopting the heating type reflection furnace, it is possible to reduce the volume compared to the existing resistance furnace with refractory bricks and heat insulators, and it is not necessary to replace the heating wire, and only the specimen is heated so that the rod and the specimen grip of the high heat resistant alloy material are heated. It is an object of the present invention to provide a high temperature tensile and fatigue test apparatus using a reflector that can reduce the cost and greatly shorten the high temperature arrival time.

1 is a front view showing a tensile and fatigue testing apparatus according to the present invention

2A and 2B are perspective views showing an open state and a closed state of a reflection path applied to the present invention;

Figure 3a and 3b is a state diagram showing a state in which light emitted from the light source of the reflection path in the present invention is concentrated on the specimen

Figure 4 is a plan view showing a jig for mounting the reflector in the present invention

Figure 5 is a mounting state showing a state in which the resistance passage in the conventional tensile and fatigue testing apparatus

6 is an exploded view showing the internal structure of a conventional resistor passage

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

1: tensile and fatigue test device 2: upper body

3: lower body 4a, 4b: rod

5a, 5b: Ply Grip 7: Psalm

20: reflection furnace 210: body

211: first body 212, 215: upper plate member

213,216: lower plate member 214: second body

219,220 shield part 219a, 219b upper shield member

220a, 220b: lower shield member 221: fixing means

230: halogen lamp 240: reflector

250: jig 251: support

252: clamping means 255: hinge means

P1: first focus P2: second focus

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The high-temperature tensile and fatigue test apparatus using the reflection path according to the present invention has upper and lower rods 4a and 4b installed up and down from the top 2 and the lower body 3, respectively, and the specimen grips 5a and the tip thereof. And a high temperature furnace for heating the specimen 7 mounted by 5b) to a predetermined high temperature condition, wherein the high temperature furnace is a light-intensive heating reflecting furnace 20, the reflecting furnace 20 having a central portion. The main body 210 is configured to be separated into a first body 211 and a second body 214 centering the specimen insertion space to enable the opening and closing of the specimen insertion space, and the specimen insertion space in the first body 211. A plurality of halogen lamps 230 fixed radially around the center, and an elliptical reflector installed to surround each of the halogen lamps 230 to centrally reflect the light emitted from the halogen lamps 230 into the specimen insertion space ( 240 and the main body 210 to the test apparatus (1) In the high-temperature tensile and fatigue test apparatus using a reflector made of a jig 250 provided in order to, the first 211 and the second body 214, respectively, the halogen lamp 230 and the reflector 240 Two plate members 212 and 213, 215 and 216 horizontally arranged in parallel with each other on the upper and lower sides thereof, and fixing means for connecting and fixing the two plate members 212 and 213, 215 and 216 to each other ( 221 and two semi-circular grooves 217a formed at one side between two plate-shaped members 212 and 215, 213 and 216 which are combined with each other when the first and second bodies 211 and 214 are combined. 217b) is one specimen insertion hole.

In particular, the semi-cylindrical shield members 219a, 219b, 220a, and 220b are fixed to the semicircular grooves 217a and 217b of the upper and lower plates 212 and 215 and the lower plate members 213 and 216, respectively. When the main body 214 is combined, the cylindrical shields 219 and 220 are formed to surround the front ends of the rods 4a and 4b and the specimen grips 5a and 5b.

On the other hand, the halogen lamp 230 is installed so as to be located at the position of the first focus (P1) of the reflector 240 surrounding it, the reflectors 240 so that each second focus (P2) overlap in the specimen insertion space It is characterized in that the arrangement.

In addition, the reflector 240 is characterized in that the inner surface is coated with chromium (Cr) or gold (Au) to increase the reflectivity.

In addition, the jig 250 is provided with a support 251 which is fixed to the first body 211 in the horizontally and long direction, and is provided at both ends of the support 251, the upper main body of the test apparatus 1 ( 2) and the clamping means 252 is fastened to the guide frame 6 connecting the lower body 3 up and down.

In particular, the support 251 is composed of one end portion 251a including the clamping means 252 on one side and the remaining portion 251b, and these two portions 251a and 251b are hinge means 255. It is characterized in that the one end portion 251a is connected to be folded back.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a tensile and fatigue test apparatus according to the present invention, Figures 2a and 2b is a perspective view showing an open state and a closed state of the reflection path applied to the present invention, Figures 3a and 3b of the reflection path in the present invention This is a state diagram showing a state in which light emitted from a light source is concentrated on a specimen.

As shown in the drawing, the present invention excludes the resistance furnace of the heating wire heating method, and instead reflects the light emitted from the light source onto the specimen, instead of the reflection furnace of the light-intensive heating method of heating only the specimen without raising the temperature of the furnace itself. A tension and fatigue test apparatus employing a furnace).

That is, in the reflection path, a plurality of light sources installed in a predetermined arrangement emit light and at the same time, the emitted light is concentrated through a reflector to a specimen located at the center of the light source, and the specimen is heated by the concentrated light. have.

First, the reflection path 20 is provided with a main body 210 in which a plurality of light sources 230 and a reflector 240 are fixed, and the main body 210 is a reflection path 20 for testing. It is composed of a structure that can wrap the specimen (7) previously mounted by the rod (4a, 4b) and the specimen grip (5a, 5b) when mounted to 1).

That is, the main body 210 is composed of a first 211 and a second main body 214 centered on the specimen insertion space in the center of the light source 230, and the two main bodies 211 and 214 are hinged to each other to form a second. The main body 214 is rotated in the transverse direction in the first body 211 is configured to open and close the center specimen insertion space formed by the two main bodies (211,214).

The first 211 and the second body 214 are two plate members that are horizontally arranged in parallel with each other above and below the halogen lamp 230 and the reflector 240, which will be described later. (212 and 213, 215 and 216), and the two plate members (212 and 213, 215 and 216) up and down while interposed therebetween to fix the gap between the two plate members (212 and 213, 215 and 216). It comprises a fixing means 221 for fixing the connection.

Here, the upper plate member 212 of the first body 211 is one side is concave incision in the form of a 'V' toward the center, the upper portion of the second body 214 in the cutout (212a) The upper plate member 215 of the second body 214 has a shape corresponding to the cutout 212a of the upper plate member 212 of the first body 211 so that the plate member 215 may be fitted and combined. Has

In addition, the lower plate-like member 213 of the first body 211 is similarly cut in a concave shape in a 'V' shape toward the center thereof, and the cut-out portion 213a of the second body 214 The lower plate member 216 of the second body 214 corresponds to the cutout 213a of the lower plate member 213 of the first body 211 so that the lower plate member 216 may be fitted and combined. It has a shape.

As a result, each of the plate members 215 and 216 of the second body 214 is cut out of the corresponding plate member 212 and 213 of the first body 211 while the second body 214 is closed by the first body 211. 212a and 213a are inserted into and combined with each other. Thus, when the two main bodies 211 and 214 are closed, that is, when the plate members 212 and 215, 213 and 216 are combined with each other, the upper and lower plate members 212 and 215, 213 and 216 generally form a hexagonal shape.

Here, the shape of the cutouts 212a and 213a of the plate members 212 and 215 of the first body 211 or the two plate members 212 and 215 and 213 and 216 of the first and second bodies 211 and 214. ), The overall shape formed in combination with each other may vary.

However, the upper plate members 212 and 215 and the lower plate members 213 and 216 of the first body 211 and the second body 214 are combined with each other (the second body is closed by the first body). Two semicircular grooves 217a and 217b formed on one side between two plate members 212 and 215, 213 and 216 (between upper and lower plate members of the first and second bodies) and one hole (test piece insertion). Holes).

In addition, semi-cylindrical shield members 219a, 219b, 220a, and 220b are fixed to the semicircular grooves 217a and 217b of the upper and lower plates 212 and 215 and the lower plate members 213 and 216, respectively. In the state in which the second body 214 is combined with each other (the state in which the second body is closed by the first body), the two shield members 219a and 219b, 220a and 220b, which are combined with each other, form one cylindrical shape.

That is, in the state where the first 211 and the second body 214 are combined, the two shield members 219a and 219b installed on the upper plate members 212 and 215 respectively form one cylinder to form the upper shield part 219. In addition, the two shield members 220a and 220b respectively installed on the lower plate members 213 and 216 form one cylinder to form the lower shield part 220.

As a result, when the reflection path 20 is mounted to the test apparatus 1, the upper side 219 and the lower shield portion 220 configured as described above hold the upper and lower ends of the specimen 7, respectively. The upper portion 4a and the lower rod 4b of (1) and the specimen grips 5a and 5b connected to the distal ends of the rods 4a and 4b are surrounded by the first specimen 211. And a space between the upper plate members 212 and 215 and the lower plate members 213 and 216 of the second body 214.

In addition, the first 211 and the second body 214 is provided with a locking means 222 for locking the second body 214 to the first body 211, the locking means 222 is a second As long as the main body 214 can be fixed in the closed state by the 1st main body 211, it can be implemented in any one.

On the other hand, the reflection path 20 is a high-temperature furnace of a light-intensive heating method for concentrating and heating the light, the heat source is a plurality of light sources 230 installed in the body 210.

The light source 230 is fixed radially around the specimen insertion space into which the specimen 7 is placed in the main body 210, and is preferably implemented by a halogen lamp.

2A and 2B, four halogen lamps 230 are installed in the first body 211, and the halogen lamps 230 are formed of the first body 211 and the second body 214. It is arrange | positioned in all directions about the specimen insertion space to form.

Here, reference numeral 223 denotes a power supply cable connected to an external power supply means (not shown), and reference numeral 224 connects the power supply cable 223 to the electrode of each halogen lamp 230. Represents a connector.

Each of the halogen lamps 230 is fixedly installed vertically in the space between the upper plate member 212 and the lower plate member 213 of the first body 211, the light emitted from each halogen lamp 230 Is reflected by each reflector 240 installed around each halogen lamp 230 in the space between the two plate members 212 and 213 to be concentrated on the specimen 7 positioned at the center of the main body 210.

The reflector 240 is fixedly installed while being interposed between the upper plate members 212 and 213 and the lower plate members 215 and 216 of the main body 210, and the overall shape of each reflector 240 is elliptical, and each halogen lamp ( 230 is installed to surround the periphery.

Here, light emitted from each halogen lamp 230 positioned radially of the specimen 7 can be reflected by each reflector 240 and then concentrated on the central specimen 7. It has a focus (P1, P2) and the light emitted from one of the two focus (P1, P2), that is, the first focus (P1) converges to the other focus, that is, the second focus (P2) As a principle, the light emitted from the halogen lamp 230 positioned at the first focal point P1 of the ellipsoidal reflector 240 is reflected from the inner surface of each reflector 240, and eventually the second focal point P2. Will be concentrated.

That is, as shown in FIGS. 3A and 3B, when the plurality of reflectors 240 are installed in accordance with the number of halogen lamps 230, the plurality of reflectors (ie, the second focus P2 overlaps at one point P) When the 240 is disposed, the light emitted from each halogen lamp 230 positioned at the first focal point P1 of each reflector 240 is reflected by the reflector 240 and then the second focal point P2 overlaps. In the position P where the second focal points P2 overlap, the light emitted from the halogen lamp 230 is concentrated, so that a high temperature condition may be instantaneously formed.

Of course, in arranging the plurality of reflectors 240 around the specimen insertion space of the main body 210, the light emitted from each halogen lamp 230 when the specimen 7 is heated, the specimen 7 in the center of the main body 210 In order to be concentrated in the above, it is obvious that each of the reflectors 240 should be disposed so that the second focal points P2 can be overlapped at the position where the specimen 7 is located, that is, the specimen insertion space of the main body 210. something to do.

3A shows that two halogen lamps 230 are installed, and FIG. 3B shows four halogen lamps 230 are installed. After the light emitted from each halogen lamp 230 is reflected from the corresponding reflector 240, the specimen ( 7) shows the state of concentration.

Here, the number of halogen lamps 230 and reflectors 240 is not limited to the illustrated embodiment, the larger the number is, the faster the heating temperature of the specimen 7 can be increased, the high temperature arrival time can be shortened. have.

In addition, as described above, a coating treatment is applied to an inner surface of the reflector 240 that concentrates and reflects the light emitted from the halogen lamp 230 at the first focal point P1 to the second focal point P2. Preferably, it is preferable to coat chromium (Cr) or gold (Au) which is strong in light and has high resistance to oxidation or corrosion.

Generally, the reflectivity of gold is 85%, which is 1.4 times higher than that of chromium.

Meanwhile, the reflection path 20 includes a jig 250 for mounting the reflection path body 210 to the test apparatus 1.

4 is a plan view showing a jig for mounting a reflection path in the present invention, the jig 250 is a support 251 is fixed to the rear of the first main body 211 in a long and horizontal direction, and the support ( It comprises a clamping means 252 provided at both ends of the (251).

Here, the support 251 is formed long and is installed so that the first body 211 is located in the center of the length.

As shown in FIG. 1, the clamping means 252 is fastened to a guide frame 6 having a circular cross section that vertically connects the upper main body 2 and the lower main body 3 of the test apparatus 1 upward and downward. As a ring-shaped structure divided into two parts, the guide frame 6 is tightened by using the fastening bolt 253 and the nut 254.

In addition, the support 251 is preferably provided with a hinge means 255 so that one end portion 251a including the clamping means 252 on one side can be folded back.

That is, the support 251 is divided into one end portion 251a including the clamping means 252 and the remaining portion 251b, and the two portions 251a and 251b are connected to the hinge means 255. Thus, when the reflection path 20 is removed, the one end portion 251a can be flipped backward after the clamping means 252 is released.

Hereinafter, a process of setting the test apparatus 1 according to the present invention will be described. First, the reflection path 20 is positioned in accordance with the height of the pre-mounted specimen 7, and both clamping means 252 of the jig 250 are positioned. To the guide frame 6 to fix the vertical position of the reflection path (20).

Of course, the reflective path 20 is the specimen 7 is the space between the upper plate member 212,215 and the lower plate member (213,216) of the first 211 and the second body 214, that is, in the specimen insertion space It will be appreciated that the height should be adjusted to be simultaneously exposed to the reflector 240.

Thereafter, when the second main body 214 is closed and locked to the first main body 211, and power is supplied to each halogen lamp 230, light emitted from each halogen lamp 230 is applied to the specimen at the reflector 240. The specimen 7 is heated while being intensively reflected toward (7).

In this manner, in the test apparatus 1 according to the present invention, the light emitted from the halogen lamp 230 is concentrated to the specimen 7 through the reflector 240 so as to heat only the specimen 7. By employing the reflecting furnace 20, the local heating of the specimen 7 is possible without raising the temperature of the furnace itself, thereby shortening the high temperature arrival time.

As described above, according to the tensile and fatigue test apparatus according to the present invention by employing a light-intensive heating reflection path for heating only the specimen by concentrating the light emitted from a plurality of halogen lamps to the specimen through the reflector for heating the specimen , Has the following effect:

1) Compared with the existing resistance furnace where the firebrick and heat insulator are to be provided, the volume of the reflection furnace is small and there is an advantage in that it is easy to remove / install.

2) There is no additional cost for hot wire replacement, and there is no hassle of new temperature correction every time hot wire replacement.

3) The specific part of the specimen can be heated, and thus, the rod and the specimen grip for fixing the specimen do not have to be made of expensive high heat resistant alloy, thereby reducing the cost.

4) As only the specimen is heated, the time taken for the specimen to reach a certain temperature can be significantly shortened compared to the existing resistance furnace (about 1.5 hours at 500 ° C) (about 5 minutes at 500 ° C). .

Claims (7)

delete The specimens 7 mounted by the upper and lower rods 4a and 4b and the specimen grips 5a and 5b at their ends, which are installed up and down from the upper part 2 and the lower main body 3, respectively, are placed at a predetermined temperature. And a high temperature furnace for heating under the condition, wherein the high temperature furnace is a light-intensive heating type reflecting furnace 20, which is the first 211 and the second centering center of the specimen insertion space. The main body 210 is configured to be separated into the main body 214 and configured to open and close the specimen insertion space, and a plurality of halogen lamps 230 are fixed radially fixed around the specimen insertion space in the first body 211. And an elliptical reflector 240 installed to surround each of the halogen lamps 230 to concentrate the light emitted from the halogen lamps 230 into the specimen insertion space, and to test the body 210. A reflection path including a jig 250 provided for mounting on the In the high temperature tensile and fatigue test apparatus, The first body 211 and the second body 214 of the main body 210 are two plate-shaped horizontally arranged in parallel with each other on the upper side and the lower side with the halogen lamp 230 and the reflector 240 therebetween, respectively. Members 212 and 213, 215 and 216, and fixing means 221 for connecting and fixing the two plate members 212 and 213, 215 and 216 to each other. When the main body 214 is combined, two semicircular grooves 217a and 217b formed at one side between two plate members 212 and 215, 213 and 216, which are combined with each other, form one specimen insertion hole. High temperature tensile and fatigue test equipment used. The semi-cylindrical shield members 219a, 219b, 220a, and 220b are fixed to the semicircular grooves 217a and 217b of the upper side 212 and 215 and the lower plate members 213 and 216, respectively. ) And the second body 214 is a high-temperature tension using a reflector, characterized in that for forming the cylindrical shield portion (219, 220) surrounding the tip of each rod (4a, 4b) and the specimen grip (5a, 5b) And fatigue testing apparatus. delete 3. The high temperature tensile and fatigue test apparatus of claim 2, wherein the reflector 240 is coated with chromium (Cr) or gold (Au) to improve reflectivity. According to claim 2, wherein the jig 250 is provided on both ends of the support 251 is fixed to the first main body 211 in the horizontal and long direction and is installed on both ends of the test device (1) High temperature tensile and fatigue testing apparatus using a reflector, characterized in that consisting of a clamping means (252) fastened to the guide frame (6) connecting the upper body (2) and the lower body (3) up and down. The method of claim 6, wherein the support 251 is composed of one end portion 251a including a clamping means 252 on one side and the remaining portion 251b, and these two portions 251a and 251b are hinged means. High temperature tensile and fatigue testing apparatus using a reflector, characterized in that configured to be connected to (255) so that the one end (251a) can be folded backward.