JP3379284B2 - Thermomechanical analyzer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermomechanical analyzer for measuring the thermal expansion (shrinkage) of a heated or cooled sample and analyzing the material of the sample. TECHNICAL FIELD The present invention relates to a sample mounting chuck for thermomechanical analysis for holding a sample in a shape. 2. Description of the Related Art A thermomechanical analyzer is used as one means for analyzing materials in all fields such as metals and nonmetals. For example, a sample is heated while a constant tensile load is applied to the sample, and a thermal dimensional change of the sample is measured to obtain a thermal expansion coefficient specific to the sample, and a microstructure analysis of the sample is performed. In particular, when measuring the thermal expansion coefficient of a fibrous sample, first, as shown in FIG. 3, both ends of a sample TP are held by chucks 101 and 102, respectively, and
01 is in contact with the lower surface of the bottom 103a of the sample support tube 103 so that the lower end of the other chuck 102 is
The support tube 104 is set so as to be in contact with the upper surface of the bottom portion 104a. The support tube bottom portion 103a and the detection rod bottom portion 104a are provided with cutouts 103b and 104b through which the sample TP passes. The sample T is provided near the support tube 103.
In order to heat or cool P, a heating device or a cooling device (not shown in the drawing) is provided.
04, a force generator connected to this detection rod 104 (not shown, while applying a constant tensile load,
The amount of expansion of the sample TP is measured by detecting the displacement of the detection rod 104 with a displacement detector (not shown) such as a differential transformer. The chuck used in these apparatuses will be described with reference to FIGS. 4 (a) and 4 (b).
Reference numerals 1 and 102 denote an upper gripping member 1 and a lower gripping member 2, respectively.
And the projections 1a,
2a, grooves 1b, 2b are formed at positions where the gripping members 1, 2 face each other, and an adjusting pin 3 is sandwiched between the grooves 1b and 2b. Then, when the sample TP is held between the protrusions 1a2a, the opposing surfaces 1c, 2c of the two gripping members 1, 2 are parallel to each other.
A plurality of adjusting pins 3 having different diameters are prepared according to the thickness of the sample TP. After setting the sample TP and the adjustment pin 3 at predetermined positions, the upper gripping member 1 and the lower gripping member 2 are fixed with the screws 4. As described above, after both sides of the sample TP are sandwiched by the chucks 101 and 102, these chucks 10
1 and 102 are attached to predetermined positions of the support tube bottom 103a and the detection rod bottom 104a, respectively. For example, when both ends of the sample TP are held between the centers of both the chucks 101 and 102 in the width direction, the center axis of the sample TP is The mounting positions of the chucks 101 and 102 on the support tube bottom 103a and the detection rod bottom 104a are determined in advance so that the load direction coincides with the load direction. Thus, both ends of the sample TP are sandwiched between the centers of the two chucks 101 and 102 in the width direction, and one of the chucks 101 is placed at a predetermined position on the bottom 103a of the support tube 103 and the other chuck 102 is placed on the detection rod. 104 bottom 104
After mounting at the predetermined position of a, measurement of the amount of expansion is started. However, it is extremely difficult to clamp both ends of the sample TP between the centers of the chucks 101 and 102 in the width direction so that the center axis of the sample TP coincides with the load direction. Time was needed. SUMMARY OF THE INVENTION [0008] The present invention has been made to solve the above-mentioned problems.
An object of the thermomechanical analyzer is to facilitate the work of holding the sample on the chuck by aligning the center axis of the sample with the load direction. According to the present invention, there are provided two chucks for gripping both ends of a sample, loading means for applying a tensile load to the sample through the chucks, and heating or cooling the sample. In the thermomechanical analyzer provided with displacement detecting means for measuring the expansion amount or the contraction amount, the chuck comprises two sample gripping members, and at least one of these gripping members is positioned at a position when the sample is tensioned. Is provided with a triangular notch having a guide groove for fixing the groove at one point. The sample is passed through a notch provided in the holding member. Then, the test piece is tensioned on both sides of the notch, the sample is locked at the apex of the notch, and the sample is held between the two holding members of the chuck. After this operation is performed on both ends of the sample, the chuck is attached to the main body, a tensile load is applied to the sample by the load means, and the amount of expansion or contraction of the heated or cooled sample is measured by the displacement detection means. 1 (a) and 1 (b) are views showing a schematic configuration of a chuck of a thermomechanical analyzer according to the present invention. One chuck comprises an upper gripping member 1 and a lower gripping member 2, each having a projection 1a, 2a for holding the sample TP, and a groove 1b at a position where the two gripping members 1, 2 face each other. , 2b are formed. Reference numeral 3 denotes an adjustment pin held between the groove 1b and the groove 2b. When the sample TP is held between the protrusions 1a and 2a,
A plurality of different diameters are prepared according to the thickness of the sample TP so that the opposing surfaces 1c and 2c of the two gripping members 1 and 2 are parallel to each other. Reference numeral 4 denotes a screw for fixing the upper holding member 1 and the lower holding member 2 with the sample TP and the adjustment pin 3 set. Next, the method of use and operation of the chuck of the thermomechanical analyzer of FIG. 1 will be described. The sample TP is passed through the notch 5 provided in the upper gripping member 1 and set between the projections 1a and 2a of the upper gripping member 1 and the lower gripping member 2, respectively. At this time, the adjusting pin 3 having an appropriate diameter is adjusted according to the thickness of the sample TP so that the respective surfaces 1c and 2c of the upper gripping member 1 and the lower gripping member 2 are parallel to the grooves 1b and 2b. Set between And the notch 5
When the sample TP is tensioned on both sides of the notch 5, the sample TP is locked at the apex 5a along the guide groove 5b of the notch 5,
In this state, the upper holding member 1 and the lower holding member 2 are fixed with the screws 4 via the adjustment pins 3. The above-described clamping operation of the sample TP is performed in the same manner as the sample TP.
For both ends. Then, as shown in FIG. 4, the lower end of the other chuck 102 is positioned such that the upper end of one chuck 101 contacts the lower surface of the bottom 103 a of the sample support tube 103 provided with the notch 103 b through which the sample TP passes. Detection rod 104 provided with notch 104b through which sample TP passes
Of both chucks 10 so as to contact the top of bottom 104a of
Attach these chucks 101, 1
When the chucks 101 and 102 holding the sample TP locked at the apex 5a of the notch 5 of the sample No. 02 are attached, the sample support tube 1 is set so that the center axis of the sample TP coincides with the load direction.
The set positions of the chucks 101 and 102 are defined on the bottom 103a of the chuck 03 and the bottom 104a of the detection rod 104, respectively. After setting both chucks 101 and 102 on the bottom 103a of the sample support tube 103 and the bottom 104a of the detection rod 104, measurement of the expansion amount of the sample TP is started. By the way, as shown in FIG.
Is provided along the width of the upper gripping member 1 along the width of the upper gripping member 1, thereby making it easy to position the film-shaped sample when it is held by the chuck. Incidentally, the following aspects can be considered as modifications of the present invention. (1) Two chucks for gripping both ends of a sample, a load means for applying a tensile load to the sample via these chucks, and an amount of expansion or contraction when the sample is heated or cooled. In a thermomechanical analyzer provided with a displacement detecting means, the chuck comprises two sample gripping members, and at least one of these gripping members has a guide groove for fixing the position of the sample to one point when the sample is tensioned. A thermomechanical analyzer, wherein a notch is provided, and a scale is provided in the notch in a direction perpendicular to a loading direction of the sample. According to the present invention, a pair of chucks for holding a sample are provided with notches for positioning the sample, the sample is held in a state where the sample is locked in the notches, and these chucks are fixed to predetermined positions. , The work of holding the sample to the chuck with the center axis of the sample aligned with the load direction became easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a schematic configuration of a chuck for holding a sample of the present invention, wherein (a) is a plan view and (b) is a front view. FIG. 2 is a view showing a modified example of the chuck of the present invention. FIG. 3 is a diagram showing a schematic configuration around a sample support tube of the thermomechanical analyzer. 4A and 4B are diagrams showing a schematic configuration of a conventional chuck for holding a sample, wherein FIG. 4A is a plan view and FIG. 4B is a front view. [Explanation of Symbols] TP ········ Sample 1 ···································································· · Notch 5a ········· Vertex 5b ··························································

Claims (1)

(57) [Claims 1] Two chucks for gripping both ends of a sample, loading means for applying a tensile load to the sample via these chucks, and a method for heating or cooling the sample. In a thermomechanical analyzer provided with a displacement detecting means for measuring an expansion amount or a contraction amount, the chuck includes two sample gripping members, and at least one of these gripping members is positioned at one point when the sample is tensioned. A thermomechanical analyzer characterized by having a triangular notch having a guide groove fixed to the thermo-mechanical analyzer.