CN216669515U - Tensile fixture device of tensile sample for super-high strength steel round bar - Google Patents

Abstract

The utility model relates to a tensile test sample tensile fixture device for an ultra-high strength steel round bar, which can meet the tensile test of ultra-high strength materials, and comprises an upper fixture head and a lower fixture head, wherein an upper protection fixture and a lower protection fixture are arranged outside the upper fixture head and the lower fixture head, each fixture head is connected with each protection fixture through a connecting part, each protection fixture is connected with a test sample tensile device, and a clamping part of each fixture head clamps the round bar tensile test sample; the clamping parts of the upper clamp head and the lower clamp head are respectively provided with a circular hole and a square groove, and the circular holes arranged on the clamping parts of the upper clamp head and the lower clamp head vertically correspond to each other; the upper clamp head and the lower clamp head clamp the large end parts at two ends of the round bar tensile sample through circular holes; the big end parts at the two ends of the round bar tensile sample enter into respective circular holes of the upper clamp head and the lower clamp head through the side openings of the clamping parts, so that the processing efficiency is improved, the clamping operation is convenient, and the clamping efficiency is higher.

Description

Tensile fixture device of tensile sample for super-high strength steel round bar

Technical Field

The utility model relates to a tensile sample tensile fixture device for an ultrahigh-strength steel round bar, which can meet the tensile test of ultrahigh-strength materials.

Background

With the development of times and technological progress, high-strength materials are widely applied to various fields, and equipment for testing the mechanical properties of the high-strength materials is also developed. Tensile test refers to a test method for measuring material properties under an axial tensile load. The data obtained from the tensile test can be used to determine the elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength and other tensile property indexes of the material.

Traditional material tensile fixture adopts threaded connection structure, the mode of rotatory loading and unloading sample, when tensile sample intensity is higher, because the baffle intensity of restriction displacement is low for at the tensile in-process of sample, thereby the baffle produces the sample roll-off that warp and leads to the centre gripping, make the experimental result inaccurate, and when changing tensile sample, need the line to rotate to the assigned position just can take out the sample, increased the degree of difficulty of operation like this, greatly reduced experimental efficiency.

Tensile strength of high strength alloys is currently commonly tested by ASTM E-8. The existing material stretching clamp is unreasonable in design and insufficient in structure, so that the conditions of sliding, breaking and the like often occur when a high-strength material test piece is stretched, and the test result is inaccurate when the operation is complex. Therefore, it is necessary to design a tensile fixture to meet the tensile test of ultra-high-strength materials.

Disclosure of Invention

The utility model aims to solve the problems of slipping, clamp deformation, inconvenient installation and disassembly and the like of the existing tensile clamp during the tensile test of high-strength materials, and provides a tensile test sample tensile clamp device for an ultrahigh-strength steel round bar, which is applied to a material tensile testing machine, replaces the original material tensile test clamp, changes the installation and unloading modes of the round bar sample, enables the round bar sample to be replaced more quickly in the material tensile test process, improves the stress condition of the clamp during the tensile test of the round bar, enables a clamp baffle plate to be not easy to deform during the material tensile test, and obtains more accurate test data.

The purpose of the utility model is realized as follows: a tensile fixture device of a tensile sample for an ultra-high strength steel round bar comprises an upper fixture head and a lower fixture head, wherein the upper fixture head and the lower fixture head are arranged in an up-down symmetrical mode in the same structure, each fixture head is correspondingly provided with a connecting part and a clamping part which are connected, an upper protection fixture and a lower protection fixture are respectively arranged outside the upper fixture head and the lower fixture head, each fixture head is connected with each protection fixture through the connecting part, each protection fixture is connected with a sample tensile device, and the clamping part of each fixture head clamps the tensile sample of the round bar;

the clamping parts of the upper clamp head and the lower clamp head are respectively provided with a circular hole and a square groove, and the circular holes arranged on the clamping parts of the upper clamp head and the lower clamp head vertically correspond to each other; the upper clamp head and the lower clamp head clamp the large end parts at two ends of the round bar tensile sample through respective circular holes; the opening setting of square groove is in the side of clamping part, and the big head tip at pole extension sample both ends enters into the respective circular port of upper clamp head and lower clamp head through the side opening of this clamping part, and the big head tip at extension sample both ends can get into is guaranteed to the side opening shape and the size of this clamping part and the size of square groove.

Furthermore, each clamp head is connected with each protection clamp through a connecting part, namely the outer contact surfaces of the upper clamp head and the lower clamp head are connected with the inner contact surfaces of the upper protection clamp and the lower protection clamp in a positive and negative trapezoidal shape, the outward tensile force of each protection clamp is changed into the mutual acting force of the positive and negative trapezoidal shapes, and the acting force of each connecting part is transmitted to the clamping parts of the upper clamp head and the lower clamp head, so that the round bar tensile sample is stretched up and down.

Furthermore, one side of each circular hole formed in the upper clamp head and the lower clamp head, which is close to the square groove, is in a certain taper.

Furthermore, the central axes of the respective circular holes formed in the upper clamp head and the lower clamp head are positioned on the central axis of the connecting part and also positioned on the central axis of the round bar tensile sample.

Furthermore, square groove can ensure that pole tensile sample can move about from top to bottom in the axis direction, should guarantee to be greater than 10mm at the thickness of the circular port that square groove and pole tensile sample are connected.

Furthermore, the outer shapes of the upper protection clamp and the lower protection clamp are both conical.

Further, under the using state, the symmetrical upper clamp head and the symmetrical lower clamp head are oppositely installed, the circular holes of the clamping parts of the upper clamp head and the lower clamp head are opposite, and the side surface of the square groove faces the direction of an operator.

Furthermore, the upper clamp, the lower clamp and the contact surface of the tensile sample can be in clearance fit.

Compared with the prior art, the utility model has the following advantages: the sample stretching clamp is simple in structure, a sample can be directly placed in a clamping position through the side opening, and the matched stretching sample does not need thread machining, so that the machining efficiency is improved, and the efficiency of installing the sample is improved; the device and the matching of the sample improve the degree of freedom between the sample and the clamp, so that the stress of the round bar sample is more balanced when the clamp is clamped, the clamping operation is convenient, and the clamping efficiency is higher. Because the tensile strength of the ultrahigh-strength steel exceeds 1800MPa, the chuck ensures that the vertical coaxiality of the tensile sample is high, and the equipment cannot be damaged due to the high strength of the sample. The diameter of the round hole at the upper end of the clamp is adjusted, so that the clamp can adapt to the test of tensile samples of ultrahigh-strength steel bars with different sizes.

Drawings

Fig. 1 is a schematic structural diagram of a specimen tensile fixture for a specimen apparatus according to an embodiment of the present invention.

The device comprises an upper clamp head 1, a lower clamp head 2, a round bar tensile sample 3, an upper protection clamp 4, a lower protection clamp 5 and a square groove 6.

Detailed Description

In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and of being practiced or being carried out by those skilled in the art without departing from the spirit and scope of the present application, and it is not intended that this application be limited to the specific embodiments disclosed below.

The application provides a tensile fixture device of a tensile sample for an ultra-high strength steel round bar, which comprises an upper fixture head 1 and a lower fixture head 2; each clamp head is provided with a connecting part and a clamping part which are connected correspondingly; the connecting part is connected with an upper protection clamp 4 and a lower protection clamp 5, the upper protection clamp 4 and the lower protection clamp 5 are connected with a sample stretching device, and the clamping part is used for clamping a round bar stretching sample 3;

the clamping ends of the upper clamp head 1 and the lower clamp head 2 which are symmetrical to each other are provided with a circular hole and a square groove; the circular hole can clamp the end part of the clamping big end of the tensile sample when the two symmetrical clamp heads are clamped; the square groove forms a side opening shaped and sized to allow entry of the round bar tensile specimen 3; that is, the square groove forms a side opening, and the round bar tensile test piece 3 is ensured to enter the square groove.

In the using state, the symmetrical upper clamp head 1 and the symmetrical lower clamp head 2 are oppositely arranged, the round holes for clamping the round bar tensile sample 3 are oppositely arranged, and the side faces of the square grooves face the direction of an operator.

And the upper clamp and the lower clamp are in clearance fit with the joint surface of the sample.

The circular hole for clamping the round bar tensile sample 3 is a through hole of the clamping end of the clamping part which is communicated up and down, and the center axis of the circular hole for clamping the round bar tensile sample 3 is positioned on the center axis of the connecting part.

Each clamp head is connected with each protection clamp through a connecting portion, namely the outer contact surfaces of the upper clamp head 1 and the lower clamp head 2 are connected with the inner contact surfaces of the upper protection clamp 4 and the lower protection clamp 5 in a positive and negative trapezoidal mode, the outward tensile force of each protection clamp is changed into the mutual acting force of the positive and negative trapezoidal modes, and the force is transmitted to the clamping portions of the upper clamp head 1 and the lower clamp head 2 under the acting force of each connecting portion, so that the round bar tensile sample 3 is stretched up and down. Specifically, the connecting part is fixedly connected with the upper protection clamp 4 and the lower protection clamp 5 through a positive trapezoid, and when the round bar tensile sample 3 is installed, the symmetrical tensile clamps are in a free state, so that the round bar tensile sample 3 can be easily installed; when the clamp is under tension, the stretching clamp is under the pressure of the protection clamp so as to fix the stretching clamp to ensure that the round bar tensile sample 3 is tightly fixed up and down.

The outer contact surface of the upper clamp head 1 and the lower clamp head 2 of the sample device is connected with the inner contact surface of the upper protection clamp 4 and the inner contact surface of the lower protection clamp 5 in a positive and negative trapezoidal mode, correspondingly, the circular hole of the tensile clamp is close to the square groove and is of a certain taper.

After the sample tensile clamp is installed in place, the central axes of the upper clamp head and the lower clamp head can be consistent with the central axis of the sample.

The square groove can ensure that the round bar tensile sample can move up and down in the axis direction, and the thickness of the end face of the square groove connected with the sample is guaranteed to be larger than 10 mm.

In the embodiments, the sample tensile fixture is used in a sample device, which is not the focus of the embodiments of the present application, and therefore, the sample tensile fixture is not specifically explained herein, nor is it shown in the accompanying drawings. The sample device should be capable of providing the tensile force required for the tensile test and provide an operational interface for controlling the tensile test. The test piece is used for parts and materials needing to be subjected to a tensile test.

Referring to fig. 1, the utility model is a tensile specimen tensile fixture device for an ultra-high strength steel round bar, comprising an upper fixture head 1 and a lower fixture head 2, wherein the upper fixture head 1 and the lower fixture head 2 are respectively arranged at the upper end and the lower end of a round bar tensile specimen 3, the outer side surfaces of the upper fixture head 1 and the lower fixture head 2 are respectively fixedly matched with an upper protection fixture 4 and a lower protection fixture 5, and the upper protection fixture 4 and the lower protection fixture 5 are connected with equipment. Specifically, go up anchor clamps head 1 with lower anchor clamps head 2 is installed relatively on last protection anchor clamps 4 and lower protection anchor clamps 5, go up protection anchor clamps 4 and lower protection anchor clamps 5 and be connected with test equipment, it is right with lower anchor clamps head 2 to go up anchor clamps head 1 like this the pole tensile sample 3 carries out the centre gripping, and along with during sample equipment operation go up anchor clamps head 1 and lower anchor clamps head 2 and keep away from each other, the realization is right pole tensile sample 3's tensile, and then form right pole tensile sample 3's tensile test.

The structure of the upper chuck head 1 will be described below by taking the chuck head as an example.

The upper clamp head 1 is provided with an upper protection clamp 4 which is connected, when the upper protection clamp 4 is acted by an upward acting force of equipment, two halves of the upper protection clamp 4 are drawn close inwards, the upper protection clamp 4 and the upper clamp head 1 are connected with each other, and then two halves of the upper clamp head 1 are drawn close inwards at the same time to clamp the round bar tensile sample 3 tightly. Wherein, above-mentioned anchor clamps head 1 contains the circular port, can test the pole tensile sample 3 of different diameters through the diameter size that sets up the circular port, and the last wainscot of going up anchor clamps head 1 is planar structure, and the tip processing of sample becomes the plane and laminates mutually with last anchor clamps head 1, and the tip diameter of sample is greater than the circular port diameter when anchor clamps head 1 is closed, can guarantee like this that the sample can not the roll-off and guarantee tensile safe operation. It is within the scope of the present embodiment that the testing of the tight connection between the round bar of the super high strength steel with different diameters and the round bar tensile specimen 3 can be realized.

Go up anchor clamps head 1 and set up square groove 6, square groove 6 is in when the equipment is not atress is in loose state, can easily with in the great tip of diameter of sample 3 is installed the circular port, leads to equipment weight lighter like this moreover, convenient operation. The square groove is provided to ensure that the thickness of the lower end of the upper clamp head 1 is 10mm or more to endure the tensile strength of the super-steel bar, and although the present invention has been described in detail through the above preferred embodiment, it should be understood that the above description should not be construed as limiting the present invention.

Claims (8)

1. A tensile test sample tensile fixture device for an ultra-high strength steel round bar comprises an upper fixture head (1) and a lower fixture head (2),

the upper clamp head (1) and the lower clamp head (2) are arranged in an up-down symmetrical mode in the same structure, each clamp head is correspondingly provided with a connecting portion and a clamping portion which are connected, an upper protection clamp (4) and a lower protection clamp (5) are respectively arranged outside the upper clamp head (1) and the lower clamp head (2), each clamp head is connected with each protection clamp through the connecting portion, each protection clamp is connected with sample stretching equipment, and the clamping portion of each clamp head clamps a round bar stretching sample (3);

the clamping parts of the upper clamp head (1) and the lower clamp head (2) are respectively provided with a circular hole and a square groove (6), and the circular holes arranged on the clamping parts of the upper clamp head (1) and the lower clamp head (2) vertically correspond to each other; the upper clamp head (1) and the lower clamp head (2) clamp the big end parts at two ends of the round bar tensile sample (3) through respective circular holes; the opening setting of square groove (6) is in the side of clamping part, and the big end tip at pole extension specimen (3) both ends enters into in the respective circular port of last anchor clamps head (1) and lower anchor clamps head (2) through the side opening of this clamping part, and the size of the side opening shape and the size of this clamping part and square groove (6) are guaranteed the big end tip at extension specimen (3) both ends can get into.

2. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: each clamp head is connected with each protection clamp through a connecting portion, namely the outer contact surface of the upper clamp head (1) and the outer contact surface of the lower clamp head (2) are connected with the inner contact surface of the upper protection clamp (4) and the inner contact surface of the lower protection clamp (5) in a forward and reverse trapezoidal shape, the outward tensile force of each protection clamp is changed into the mutual acting force of the forward and reverse trapezoidal shapes, and the force is transmitted to the clamping portion of the upper clamp head (1) and the clamping portion of the lower clamp head (2) under the acting force of each connecting portion, so that the round bar tensile sample (3) is stretched up and down.

3. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: one side of each circular hole formed by the upper clamp head (1) and the lower clamp head (2) and close to the square groove (6) is provided with a certain taper.

4. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: the central axes of the respective circular holes formed in the upper clamp head (1) and the lower clamp head (2) are positioned on the central axis of the connecting part and also positioned on the central axis of the round bar tensile sample (3).

5. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: square groove (6) can ensure that the major part tip at the both ends of pole tensile sample (3) can move about from top to bottom along the axis direction when anchor clamps press from both sides tightly, should guarantee to be greater than 10mm at the thickness of the circular port that square groove (6) and pole tensile sample (3) are connected.

6. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: the outer shapes of the upper protection clamp (4) and the lower protection clamp (5) are both conical.

7. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: when the upper clamp head (1) and the lower clamp head (2) are arranged in a vertically symmetrical mode in the same structure in a use state, circular holes of clamping parts of the upper clamp head and the lower clamp head are opposite, and the side face of the square groove is opened towards the direction of an operator.

8. The tensile specimen clamping device for the ultra-high strength steel round bar according to claim 1, characterized in that: the contact surfaces of the upper clamp head (1) and the lower clamp head (2) and the tensile sample (3) can be in clearance fit.

Images