CN201555767U - A Simple Tensile Testing Machine for Thin Metal Samples - Google Patents

Abstract

The utility model relates to a test device for tensile properties of thin metal material samples. A simple tensile testing machine for thin metal samples, in which a fixing plate (3) and a fixing table (7) are arranged at both ends of the testing machine platform (8), and a screw hole is opened on the fixing plate (3) (3a), screw the screw rod (2) in the screw hole (3a), the outer end of the screw rod (2) is equipped with a rotating handle (1), and the inner end of the screw rod (2) is connected with a slide block (4); the slide block ( 4) Trapezoidal notches (9a) are provided opposite to each other on the fixed platform (7), and two right-angled wedges (9b) are inserted in the trapezoidal notches (9a), and the right-angled sides of the two wedges (9b) merge toward each other, and the wedges The hypotenuse of block (9b) sticks to both sides of trapezoidal notch (9a); On platform (8), dial gauge (5) is fixed, and scale (10) showing length is marked on platform (8) surface . The utility model is simple in structure, light and handy, convenient to assemble and disassemble, and easy to operate. It can conveniently achieve the purpose of measuring the degree of deformation and calculating the critical degree of deformation. .

Description

A Simple Tensile Testing Machine for Thin Metal Samples

(1) Technical field

The utility model relates to a material testing device in the field of materials, in particular to a testing device for tensile properties of thin metal material samples.

(2) Background technology

When the metal material is stressed beyond the elastic limit, it will undergo plastic deformation, not only the appearance and size will change, but also the internal structure and various properties (such as hardness, resistivity, thermal conductivity, etc.) of the material will also change. The degree of cold deformation has a great influence on the grain size after recrystallization, and the grain size will have an important impact on the material properties. For materials, the degree of deformation when particularly coarse grains are obtained is called the critical degree of deformation, and the critical degree of deformation of general metals is about 2%-10%. In production practice, it is often not desirable to obtain coarse grains, but fine grains are required. Due to the existence of critical deformation, the metal should avoid the critical deformation when it is stressed, so as not to deteriorate the performance of the workpiece, so special equipment is required. Measure the critical deformation of metallic materials. The critical degree of deformation is usually to measure the different degrees of deformation of a group of materials, and then calculate the number of grains per unit area after recrystallization to obtain the critical degree of deformation of a certain material.

In the prior art, the degree of deformation of materials is measured on an electronic universal material testing machine. Although relatively accurate test results can be obtained from this, there are still certain limitations and deficiencies in normal use, mainly: ① Occupies a large space, The equipment investment is expensive, and the cheapest testing machine costs more than 100,000 yuan; ②The capacity of the load sensor is too large. For thin metal sheets, the tensile force required is about 200N to 1000N, and a 1000N sensor is required. The current test equipment configuration The capacity of the sensor is 20KN, 100KN, too large sensor capacity will affect the accuracy of the test; ③The gauge length of the extensometer is 25mm and 50mm, and the actual gauge length is 100mm. If the extensometer is not installed, it will affect the accuracy of the measurement. The extensometer is cumbersome and expensive; ④ It is inconvenient to assemble and disassemble. It is difficult to pull the required degree of deformation in one test on the testing machine. It needs to be disassembled and assembled many times to succeed. It must be run in the reverse direction first to unload the load, which is time-consuming and affects the efficiency of the test.

(3) Contents of the invention

The purpose of this utility model is to overcome the shortcomings of the electronic universal material testing machine in the prior art, and provide a small tensile material testing machine with convenient operation, simple structure, low cost and strong practicability.

The purpose of this utility model is achieved through the following technical solutions:

A simple tensile testing machine for thin metal samples is characterized in that a fixed plate and a fixed table are respectively arranged at both ends of the testing machine platform, a screw hole is opened on the fixed plate, and a screw hole is provided in the screw hole (3a). Screw in the screw, the outer end of the screw is equipped with a rotating handle, and the inner end of the screw is connected with a slider;

A trapezoidal notch with a small mouth and a large inner side is respectively provided on the slider and the fixed platform, and two right-angled wedges are inserted into the trapezoidal notch. side-to-side

The dial indicator is fixed on the platform, and the thimble of the dial indicator is vertically against the moving end face of the slide block. On the platform surface, a ruler showing the length is marked between the fixed plate and the fixed platform.

Further, the right-angled side of the wedge is a sawtooth knurled edge.

Further, the angle between the hypotenuse of the wedge and the central axis of the platform is 30 to 45 degrees.

Further, the width of the outer opening of the trapezoidal groove is 16 to 26 mm.

Further, the height of the trapezoidal groove is 30 to 44 mm.

Further, the test platform has a length scale of 150 to 220 mm.

The utility model patent is a practical small strip tensile test device, which can achieve the purpose of measuring the degree of deformation and overcome the shortcomings of stretching on an electronic universal material testing machine. The device of the utility model has a simple structure, and the sample is placed between the wedges, and the contact surface is knurled to increase the friction coefficient between the wedges and the sample, and the clamping is firm. The maximum displacement between sliders can reach 220mm, which just meets the requirements of general samples, and the thickness of samples is generally less than 1mm; the rotating mechanism is composed of a handle and a screw pair, and the screw pair can use a screw mechanism , turning the handle clockwise or counterclockwise can drive the slider to move. The length of the screw is generally 60 to 90 mm; there is a scale on the outer edge of the bottom surface of the device platform, starting from 0 and marking to 150 to 220 mm. The traction mechanism near the platform There is a dial indicator at the center, and the thimble is against the end face of the slider. When the slider moves, the pointer of the dial indicator will change. The circle of the dial indicator is 1mm, divided into 100 small divisions, and the accuracy is 0.01mm. According to the dial indicator The reading of the sub-meter can judge the stretching distance (that is, the amount of deformation), and the length of the sample is in the range of 160-200mm.

When the sample is clamped between the right-angled sides of the two wedges of the clamping mechanism, the distance between the rotating handle, the slider and the fixed table increases, and the component force of the inclined surfaces on both sides of the trapezoidal notch of the wedge provides two right-angled sides of the wedge. The positive pressure on the surface clamps the sample, and the serrated knurled edge on the right-angle side improves the clamping friction and clamping fastness, and it is not easy to fall off and slip out. Rotate the screw to watch the change of the sample until the critical position of fracture , confirm the value of the dial indicator, and then calculate the material deformation of the sample.

This device is convenient to unload the sample. When unloading, you only need to turn the handle counterclockwise, and it takes only 1 or 2 seconds. If it is carried out on a material testing machine, there is a process of unloading, and it will take nearly 1 minute at the fastest. Furthermore, for the general measurement of deformation degree, a group of deformation degree needs to be measured, and several samples need to be measured for the same deformation degree, and one deformation degree needs to be repeated several times, so the advantage of the assembly and disassembly time of this device is obvious.

The biggest advantage of this device is to measure those materials with low tensile strength. For example, the degree of deformation of aluminum sheets, that is, materials with relatively small tensile force, such as 100N-200N force, is not a reasonable test range for electronic universal material testing machines with large tonnage.

The advantages and beneficial effects of the utility model are that the whole set of devices is characterized by simple structure, light weight, convenient assembly and disassembly, and easy operation, which is convenient to well control the degree of deformation and improve the use efficiency. The patented device can meet the requirements of use and overcome the deficiency of the electronic universal material testing machine for measuring the degree of deformation. The structure is simple and practical, and the cost is not much. Restricted by the presence or absence of a large testing machine, the purpose of measuring the degree of deformation and calculating the critical degree of deformation can be easily achieved. It is especially suitable for testing materials with low tensile strength, and the test volume is large, and it is required to be used in occasions where fast testing is required.

(4) Description of drawings

Fig. 1 is the schematic diagram of the front view of an embodiment of the utility model simple thin metal sample tensile testing machine;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a partially enlarged structural view of several parts of the trapezoidal notch and the wedge clamping the sample of the utility model, in which it is shown that the right-angled side of the wedge is in the shape of a sawtooth knurled edge.

In the figure, 1 handle, 2 screw rod, 3 fixed plate, 3a screw hole, 4 slider, 5 dial indicator, 6 chute, 7 fixed table, 8 platform, 9a trapezoidal notch, 9b wedge, 10 ruler, G sample.

(5) Specific implementation methods

Below in conjunction with accompanying drawing, the utility model is described in detail:

A simple tensile testing machine for thin metal samples. A fixed plate 3 and a fixed table 7 are respectively arranged at the two ends of the platform 8 of the testing machine. A screw hole 3a is opened on the fixed plate 3, and the screw hole 3a Enter the screw rod 2, the outer end of the screw rod 2 is equipped with a rotating handle 1, and the inner end of the screw rod 2 is connected with a slider 4;

On the slide block 4 and the fixed platform 7, an inverted trapezoidal notch 9a with a small inner side of the mouth is provided opposite to each other, and two right-angled wedges 9b are built into the trapezoidal notch 9a, and the right-angled sides of the two wedges 9b merge toward each other, and the wedges The hypotenuse of 9b sticks to both sides of the trapezoidal notch 9a;

Fix the dial indicator 5 on the platform 8, the thimble of the dial indicator 5 is vertically against the moving end face of the slider 4, and on the platform 8 surface, mark the ruler 10 showing the length between the fixed plate 3 and the fixed platform 7 .

The length of the scale 10 is 180 mm, and the pitch of the screw rod 2 is 1 mm.

The right-angled side of the wedge 9b is a sawtooth knurled edge, which is beneficial for the right-angled side of the wedge 9b to provide strong friction to clamp the sample G.

The angle between the hypotenuse of the wedge 9b and the central axis of the platform 8 is 30 degrees, such an angle is not only beneficial for clamping the sample G, but also convenient for rotating the handle 1 to tighten the slider 4 .

The width of the outer opening of the trapezoidal notch 9a is 22mm, and the trapezoidal height of the trapezoidal notch 9a is 36mm. Such a structure and size are not only convenient for clamping the sample G, but also facilitate the operation handle 1 to tighten the slider 4 .

The utility model is simple in structure, light and handy, convenient to assemble and disassemble, easy to operate, and can conveniently achieve the purpose of measuring the degree of deformation and calculating the critical degree of deformation. .

Claims (6)

1. A simple and easy thin metal sample tensile testing machine, characterized in that: Set a fixed plate (3) and a fixed table (7) at both ends of the testing machine platform (8), set a screw hole (3a) on the fixed plate (3), screw in the screw hole (3a) The screw rod (2), the outer end of the screw rod (2) is equipped with a rotating handle (1), and the inner end of the screw rod (2) is connected with a slider (4); A trapezoidal notch (9a) with a small inner side of the mouth is oppositely provided on the slide block (4) and the fixed platform (7), and two right-angled wedges (9b) are inserted in the trapezoidal notch (9a). The right-angle sides of (9b) merge toward each other, and the hypotenuse of wedge (9b) sticks to both sides of the trapezoidal notch (9a); Fix the dial indicator (5) on the platform (8), the thimble of the dial indicator (5) is vertically against the moving end face of the slide block (4), on the platform (8) surface, on the fixed plate (3) and Mark the scale (10) showing the length between the fixed platforms (7). 2. according to the said tensile test equipment of claim 1, it is characterized in that the length of said ruler (10) is 150 to 220 millimeters. 3. The tensile test machine according to claim 1, characterized in that the right-angled side of the wedge (9b) is a sawtooth knurled edge. 4. The tensile test installation according to claim 1, characterized in that the angle between the hypotenuse of the wedge (9b) and the central axis of the platform (8) is 30 to 45 degrees. 5. The tensile test installation according to claim 1, characterized in that the width of the outer opening of the trapezoidal notch (9a) is 16 to 26 mm. 6. The tensile test installation according to claim 1, characterized in that the trapezoidal height of the trapezoidal notch (9a) is 30 to 44 mm.

Images