CN108956281A - A kind of fixation device of sheet metal drawing by high temperature extensometer - Google Patents

Abstract

The invention relates to a fixing device for a high-temperature tensile extensometer of a thin metal plate. The device fixes the high-temperature extensometer through upper and lower clamping blocks. The two clamping blocks are in the shape of a semicircle, and a through groove is opened at the contact part with the sample. It is used to fix the sample. There is an annular groove in the arc-shaped part to facilitate the connection with the high-temperature extensometer through the fixing line. The guide rod of the device is equipped with a telescopic sleeve, which is convenient for the use of samples with different gauge lengths. The invention is simple in structure, convenient and easy to operate, low in manufacturing cost, suitable for high-temperature tensile tests of metal sheets of various thicknesses and lengths, and effectively avoids the breakage of the fixed line caused by direct contact with the thin-plate sample at high temperature, and the extensometer If it falls off, the test fails.

Description

A Fixing Device for High Temperature Tensile Extensometer of Metal Sheet

technical field

The invention relates to a fixing device for a high-temperature tensile extensometer of a thin metal plate, which belongs to the technical field of testing.

Background technique

High-temperature tensile properties of metal sheets are an important test method for the static properties of materials. Obtaining the high-temperature tensile properties of metal sheets is of great significance for material selection and design. When the metal sheet is subjected to a high-temperature tensile test, the asbestos fixing wire used to fix the extensometer is often broken under the dual effects of high-temperature environment and sheet cutting, causing the extensometer to detach, the test fails, the material loss is large, and the test efficiency is low. At present, there are few studies at home and abroad on the fixing device of the high-temperature tensile extensometer of the metal sheet. The Chinese patent application publication number CN 105067425A discloses an extensometer guide rod system and a method for performing a high-temperature tensile test using the system. The device includes a sample fixture, a positioning device, and an extension guide rod. The device uses a normal temperature extensometer to conduct a high temperature tensile test on a tensile sample, and collects the material deformation of the tensile sample in a high temperature environment through an extension guide rod. However, this device is mainly designed for the tensile test of bar samples, and the room temperature extensometer should not be used to measure the tensile properties of materials in high temperature environments. With the development of technology, the current high temperature tensile test mainly uses high temperature extensometer. Therefore, in order to use a high temperature extensometer to measure the tensile properties of metal sheets, it is of great significance to invent a fixing device for the extensometer for test testing and engineering applications.

Contents of the invention

The present invention is designed to provide a fixing device for the high-temperature tensile extensometer of a metal sheet in view of the limitations of the above-mentioned existing devices. The device can perform high-temperature tensile tests on metal sheets of various thicknesses and lengths to improve test efficiency and reduce material loss.

The purpose of the present invention is achieved through the following technical solutions:

The fixing device of this kind of metal thin plate high temperature tensile extensometer is characterized in that: the device includes an upper clamping block 1 and a lower clamping block 2 with the same shape and structure, and between the upper clamping block 1 and the lower clamping block 2 Connected by the sleeve guide rod 3, the two clamping blocks are in the shape of a semicircle, and a vertical through groove 4 is processed on the side plane of the upper clamping block 1 and the lower clamping block 2, and the sample 5 is inserted into the upper In the through groove 4 of the clamping block 1 and the lower clamping block 2, an annular groove 6 is processed along the circumference on the side semicircular surface of the upper clamping block 1 and the lower clamping block 2, and the upper and lower ends of the extensometer 7 extend respectively. A fixed wire 8 is wound in the annular groove 6 of the upper clamping block 1 and the lower clamping block 2, and the tension force of the fixed wire 8 makes the tip gaps of the upper and lower two ceramic rods 9 of the extensometer 7 stabilize the clip. It is mounted on the edge of the sample 5 to realize the data collection of the sample 5 by the extensometer 7 .

Further, the sleeve guide rod 3 is composed of upper and lower symmetrical double sleeves, and its height can be adjusted to adapt to the fixation of samples 5 with different gauge lengths.

Further, the width of the through groove 4 on the upper clamping block 1 and the lower clamping block 2 is the same as the thickness of the sample 5 to form a tight fit, and the depth of the through groove 4 is less than 10% of the width of the sample 5 .

Further, the width of the annular groove 6 on the upper clamping block 1 and the lower clamping block 2 is the same as the diameter of the fixing wire 8 , and the groove depth of the annular groove 6 is greater than twice the diameter of the fixing wire 8 .

The device of the present invention has the following characteristics:

1. The fixed wire 8 is wound in the annular groove 6 to fix the upper and lower ceramic rods 9 of the extensometer 7, which avoids the cutting of the thin plate sample 5 to the fixed wire 8 at high temperature, and prevents the extensometer from falling off to cause test failure;

2. By changing the groove width of the through groove 4, the fixing of samples 5 with different thicknesses can be realized;

3. The sleeve guide rod 3 composed of up and down symmetrical double sleeves ensures that the depth of the through groove 4 of the upper clamping block 1 and the lower clamping block 2 is the same as that of the sample 5, and the adjustment of the sleeve guide rod 3 can realize the same Measurement of samples 5 with different gauge lengths;

4. The device can be used for high-temperature tensile tests on metal sheets of various thicknesses and lengths, and has the advantages of simple structure, convenient operation and low manufacturing cost.

Description of drawings

Fig. 1 is the structural representation of fixing device of the present invention

Fig. 2 is the structural representation of fixed extensometer in the device of the present invention

Detailed ways

The device of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments:

Referring to accompanying drawings 1-2, the fixing device of this kind of metal thin plate high temperature tensile extensometer is characterized in that: the device includes an upper clamping block 1 and a lower clamping block 2 with the same shape and structure, and the upper clamping block 1 and the lower clamping block 2 are connected by a sleeve guide rod 3. The height of the sleeve guide rod 3 is adjustable to adapt to the fixation of samples 5 with different gauge lengths. The two clamping blocks are in the shape of a semicircle. A vertical through groove 4 is processed on the side planes of the upper clamping block 1 and the lower clamping block 2, and the sample 5 is inserted into the through groove 4 of the upper clamping block 1 and the lower clamping block 2, and the upper clamping The width of the through groove 4 on the block 1 and the lower clamping block 2 is the same as the thickness of the sample 5 to form a tight fit, and the depth of the through groove 4 is less than 10% of the width of the sample 5; On the semicircular surface of the clamping block 2, an annular groove 6 is processed along the circumference, and a fixed wire 8 protrudes from the upper and lower ends of the extensometer 7 respectively, and is wound in the annular groove 6 of the upper clamping block 1 and the lower clamping block 2 , the tension of the fixed line 8 makes the tip gaps of the upper and lower ceramic rods 9 of the extensometer 7 stably clamped on the edge of the sample 5, so that the data collection of the sample 5 by the extensometer 7 is realized.

The width of the annular groove 6 on the upper clamping block 1 and the lower clamping block 2 is the same as the diameter of the fixed wire 8, and the groove depth of the annular groove 6 is greater than 2 times of the diameter of the fixed wire 8.

The sleeve guide rod 3 is composed of two symmetrical sleeves up and down, which ensures that the depth of the through groove 4 of the upper clamping block 1 and the lower clamping block 2 is the same as that of the sample 5, and the adjustment of the sleeve guide rod 3 can achieve different Measurement of gauge length specimen 5.

The steps that adopt device of the present invention to test are:

S1 Open the incubator, align the center of the indenter 10 of the testing machine with the sample 5, and install the sample 5;

S2 Align the through groove 4 of the extensometer 7 fixing device with the sample 5, use the fixed line 8 to fix the sample 5 and the extensometer 7 through the annular groove 6, and ensure that the two ends of the extensometer ceramic rod 9 are in close contact with the sample 5, which is convenient data collection;

S3 starts up, applies load to sample 5, collects material deformation, and obtains the high-temperature tensile performance value of the metal sheet.

Compared with the existing device, the device of the present invention can perform high-temperature tensile tests on metal sheets of various thicknesses and lengths, effectively improves test efficiency, reduces material loss, has simple structure, is convenient and easy to operate, and has low manufacturing cost.

Claims (4)

1. A fixing device for a metal sheet high temperature tensile extensometer, characterized in that: the device includes an upper clamping block (1) and a lower clamping block (2) identical in shape and structure, and an upper clamping block (1) It is connected with the lower clamping block (2) through the sleeve guide rod (3). The two clamping blocks are in the shape of a semicircle. A vertical through groove (4) is processed on the top, and the sample (5) is inserted into the through groove (4) of the upper clamping block (1) and the lower clamping block (2). On the side semicircular surface of the lower clamping block (2), an annular groove (6) is processed along the circumference, and a fixed line (8) is respectively stretched out from the upper and lower ends of the extensometer (7) to be wound on the upper clamping block (1 ) and the annular groove (6) of the lower clamping block (2), the tension of the fixed line (8) makes the tip notches of the upper and lower ceramic rods (9) of the extensometer (7) stably clamped in the On the edge of the sample (5), data collection of the sample (5) by the extensometer (7) is realized. 2. The fixing device of the metal sheet high temperature tensile extensometer according to claim 1, characterized in that: the height of the sleeve guide rod (3) is adjustable to adapt to the fixing of samples (5) of different gauge lengths. 3. the fixing device of the metal sheet high temperature tensile extensometer according to claim 1 is characterized in that: the width of the through groove (4) on the upper clamping block (1) and the lower clamping block (2) and the test The thickness of the sample (5) is the same to form a tight fit, and the depth of the through groove (4) is less than 10% of the width of the sample (5). 4. The fixing device of the metal sheet high temperature tensile extensometer according to claim 1, characterized in that: the width of the annular groove (6) on the upper clamping block (1) and the lower clamping block (2) is consistent with the fixed The diameters of the wires (8) are the same, and the groove depth of the annular groove (6) is greater than twice the diameter of the fixed wire (8).