TWI719489B - Biaxial tensile testing machine - Google Patents

Abstract

A biaxial tensile testing machine, comprising: a first mold base and a second mold base that can be separated from each other or pressurized to be close to each other, respectively; two by two are respectively arranged on the first mold base along the first axis and the second axis Two pairs of inclined plane fixed blocks on the upper side, each inclined plane fixed block is provided with a fixed inclined plane; respectively corresponding to and parallel to the two pairs of inclined plane fixed blocks and arranged on the second mold base two pairs of inclined plane slider sets, each inclined plane slider The set includes a linear slide rail and an inclined slider that can slide freely on the linear slide. The inclined slider is provided with a sliding inclined surface, the front end of the inclined slider surface is equipped with a load gauge, and the measuring part of the load gauge is equipped with a test piece clamp Head; four optical rulers are set on the second mold base, respectively used to sense the first and second axis of the moving signal of the inclined slider group, and converted into a moving size.

Description

Biaxial tensile testing machine

A biaxial tensile testing machine, especially when the upper and lower mold bases applied hydraulic pressure are pressed together, the upper and lower mold bases are respectively provided with inclined plane fixed blocks and inclined plane sliding block groups along the two axial directions and corresponding to each other. A mechanical structure with the same tensile force applied to the two shafts is generated by the corresponding angles of the fixed slope and the sliding slope.

Drawing and forming is the use of drawing dies to punch flat blanks (such as plates) into the desired product shape. Divide the plate into a number of sectors and trapezoids with equally spaced concentric circles and equiangular radial radius lines. The material in each sector area flows along its respective radius. After forming, the thickness of the finished product becomes thinner at the lower rounded corner due to the thickness of the locally stressed plate, which is prone to cracking. As the rounded corners near the pressure plate gradually increase in thickness, wrinkles are prone to occur. The influence of plate thickness changes is mainly caused by the stress state of the blank during the drawing process. The bending stress, tensile stress and compressive stress are included in the sheet metal forming process. Therefore, the stress and strain state of each part of the blank during the drawing process is different. same. From the above-mentioned basic theory of drawing forming, it can be known that drawing processing is limited by the nature of the processed material and has a great influence. However, because the traditional uniaxial tensile test cannot fully reflect the multi-axial stress change of the real round cup, there is only Through the biaxial and different loading conditions of the material, the stress change of the material can be truly reflected, and the accurate mechanical properties of the material can be obtained.

The traditional biaxial tensile testing machine is a four-drive motor or a hydraulic device, and the state characteristics of the driven solenoid valve cannot be exactly the same. Therefore, the four-axis displacement cannot be guaranteed to be exactly the same during the stretching process. Step, as long as there is an error in the displacement, it will cause uneven strain in the center area of the cross-shaped test piece, and cause the rupture to no longer be in the center area.

On the other hand, with the development of technology, the main demands of electronics, optoelectronics, communications and consumer electronics products are "light, thin, short, and small", including: mobile phones, digital cameras, and portable hard disks. Due to the consideration of product strength and reliability, it is necessary to manufacture a large number of small-sized metal parts. In addition, various system factories have improved the self-manufacturing ability of key components. The future growth potential of Taiwan's fine metal parts market will be very amazing. Therefore, how to manufacture fine metal parts with a more stable and fast process, improve product accuracy and production efficiency, has received widespread attention.

There are many kinds of manufacturing methods for fine metal parts. Among them, the metal fine plastic forming technology that can produce mass production, high stability and low cost by using molds is one of the core directions of the development of fine metal parts manufacturing technology. In the fine forming technology, the metal stamping forming process has the advantages of better mechanical properties, strong toughness, high production efficiency and high yield. It is applied to the production of fine parts and can meet the massive needs of the market at low cost. Therefore, the micro-stamping technology is regarded as a potential production technology for micro-metal parts.

After the miniaturization of metal parts, the problem of size effect has also arisen in the stamping forming technology, which has led to changes in the various microscopic properties of sheet forming. It is no longer possible to use macroscopic theoretical models to explain the material in the fine forming process. Changes in nature. The uniaxial stretching of the thin plate cannot fully reflect the multi-axial stress changes of the real drawn round cup (the change of the drawing forming force of the round cup). The fine drawing and forming process is carefully studied, and the thin plate is mainly biaxially stretched. However, domestic and foreign scholars have used the results of the uniaxial tensile test of thin plates as the basis of related academic theories and applications for the research of micro-stretch forming. There is no related literature on biaxial tensile of micro thin plates.

The purpose of the present invention is to provide a hydraulic compression and oblique slide testing machine with a minimal structure, which is suitable for high-precision measurement of precision biaxial tensile testing machines, and at the same time can reduce the problems caused by the non-synchronization of the two axes.

In order to achieve the above-mentioned object, the present invention provides a biaxial tensile testing machine, including: a mold base group, including a first mold base and a second mold base, which can face each other, and a plurality of guide posts After the bushing and the guide post are positioned correspondingly, they are vertically separated from each other or close to each other with pressure; the two pairs of inclined fixed blocks are arranged in pairs along a first axis and a second axis that form an angle with each other. On the first mold base, each inclined plane fixed block is provided with a fixed inclined plane with the same inclination angle of the other inclined plane fixed block facing the same axial direction. The inclination angles of the four fixed inclined planes are the same; two pairs of inclined plane slider groups, Are respectively corresponding to and parallel to the two pairs of inclined surface fixed blocks and are arranged on the second mold base. Each inclined surface slide block group includes a linear slide rail and an inclined surface slide block that can slide freely on the linear slide rail. The inclined sliding block is provided with a sliding inclined plane parallel to the corresponding fixed inclined plane. The front end of the inclined sliding block facing the other inclined sliding block in the same axial direction is provided with a load gauge, and a measuring part on the front end of the load gauge A test piece chuck is provided for fixing a stretched test piece; and a four optical ruler is set on the second mold base for sensing the first axis and the second axis The movement signal of the inclined slider group is converted into a movement size.

In one embodiment, the first mold base is an upper mold base, and the second mold base is a lower mold base.

In one embodiment, the test piece chuck includes a base body, a pair of gripping nozzles and a bolt. The base body is provided on the measuring part of the measuring part, and the pair of gripping nozzles are formed by a T-shaped sliding The block sliding groove assembly is arranged on the end surface of the seat body up and down, the pair of clamping nozzles respectively have a corresponding through hole, and the bolt can pass through the two through holes to tightly screw the pair of clamping nozzles.

In one embodiment, it further includes: a tensile test piece with four cross-shaped ends, each end is provided with a perforation, and each end is correspondingly placed on the chuck of the test piece. Between the clamping nozzles, and passing the bolt through the clamping nozzles and the perforation, the cross-shaped tensile test piece is clamped between the four inclined sliding blocks.

In an implementation aspect, each of the inclined sliding blocks moves on its corresponding linear slide rail and can respectively pass through an initial position and a stretching position. When each inclined sliding block clamps the cross-shaped tensile test piece At this time, it is located at its corresponding initial position, and its sliding slope is aligned with the fixed slope of the corresponding slope fixed block.

In an embodiment, when the first mold base and the second mold base are close to each other perpendicularly and pressurized, the two inclined fixed blocks parallel to the first axial direction move in the direction of the inclined sliding block in the coaxial direction , And the two inclined plane fixed blocks parallel to the second axial direction move in the direction of the coaxial inclined plane slider, and when the inclined plane sliders move to their corresponding stretching positions, the first mold base and the The second mold bases stop vertically and press close to each other, and are separated vertically from each other.

In an implementation aspect, the sliding slope of each inclined sliding block is a bolt-locked oil-free wear-resistant block, and a precision gasket can be arranged under the oil-free wear block to facilitate fine-tuning the position of the sliding block .

In an implementation aspect, each of the fixed slopes is a non-oil-feeding wear-resistant block that is locked by a bolt, and a precision gasket can be arranged under the non-oil-feeding wear-resistant block to facilitate fine adjustment of the position of the fixed sliding block.

In an implementation aspect, the first mold base and the second mold base are provided with a plurality of stop blocks, so that when the first mold base and the second mold base are perpendicular to each other, one of them can be used The stop blocks on the mold base abut against the corresponding stop blocks on the other corresponding mold base to control the minimum distance between the first mold base and the second mold base that are vertically close to each other.

In an implementation aspect, the fixed slopes of the sloped fixed blocks and the sliding slopes of the sloped sliders can be replaced or adjusted to another batch of different slope angles to change the ratio of different tensile strain rates. .

The feature of the present invention is that the biaxial tensile testing machine of the present invention uses a mechanical cam angle slider design, and performs such as 1:1, 1:1.5, 1:2 by using inclined fixed blocks and inclined sliding blocks of different angles. Wait for different strain rate ratios, so that the strain rate can be easily and accurately changed, The load gauge and optical ruler are used to accurately capture the force change of the test piece during the stretching stage and the movement data of the inclined slider. The synchronous moving structure of the present invention and the improvement of the positioning and locking structure for clamping the test piece are more suitable for stretching and operation of fine dimensions.

1‧‧‧Biaxial Tensile Testing Machine

11‧‧‧Mould base group

111‧‧‧First mold base

1111‧‧‧Guide column bushing

112‧‧‧Second mold base

1121‧‧‧Guide Post

12,12a,12b,12c,12d‧‧‧inclined fixed block

121,121a,121b,121c,121d‧‧‧Fixed slope

13,13a,13b,13c,13d‧‧‧inclined slider group

131‧‧‧Linear slide

131a,131b‧‧‧The first linear slide

131c,131d‧‧‧Second linear slide

132,132a,132b,132c,132d‧‧‧inclined slider

1321, 1321a, 1321b, 1321c, 1321d‧‧‧sliding slope

1322, 1322a, 1322b, 1322c, 1322d‧‧‧Loading gauge

13221‧‧‧Measurement Department

1323, 1323a, 1323b, 1323c, 1323d‧‧‧Test piece chuck

13231‧‧‧Block

13232‧‧‧Clamping mouth

132321‧‧‧Through hole

132322‧‧‧T-slide chute assembly

1323221‧‧‧T type slider

1323222‧‧‧T-shaped chute

1324‧‧‧Fastener

13241‧‧‧Bolt

13242‧‧‧Nut

14,14a,14b,14c,14d‧‧‧Optical scale

15‧‧‧Stop block

151‧‧‧Cap

2‧‧‧Tensile test piece

21‧‧‧End

211‧‧‧Perforation

L‧‧‧Distance

S1‧‧‧initial position

S2‧‧‧Stretching position

PV,PV’,PV"‧‧‧Vertical movement process

PH,PH’,PH"‧‧‧Horizontal movement process

X‧‧‧First axis

Y‧‧‧Second axis

[Fig. 1] is a perspective exploded view of an embodiment of the biaxial tensile testing machine of the present invention for locking a tensile test piece; [Fig. 2] is a top view of the inclined sliding block group and the optical ruler of the embodiment of Fig. 1; [Figure 3] is a three-dimensional exploded view of an embodiment of a tensile test piece locked by a test piece chuck of the biaxial tensile testing machine of the present invention; [Figure 4] is a locked tensile test piece of the present invention [Figure 5A] is a schematic diagram of the initial position of the inclined sliding block of the inclined sliding block of the biaxial tensile testing machine of the present invention; [Fig. 5B ] Is a schematic diagram of the inclined plane slider of the inclined plane sliding block of the biaxial tensile testing machine of the present invention in the tensile position; [FIG. 6A~FIG. 6C] is the fixed inclined plane of the inclined plane fixing block of the biaxial tensile testing machine of the present invention The different inclination angles of the sliding inclined surface of the inclined surface slider; [Figure 7A~FIG. 7C] is the proportional relationship between the specific angle of the biaxial tensile testing machine of the present invention and the vertical movement of the inclined surface fixed block and the horizontal sliding of the inclined surface slider; [ Fig. 8 is a schematic view of the structure of the stop block of the die set of the biaxial tensile testing machine of the present invention and its adjusted height.

The embodiments of the present invention are described in detail below in conjunction with the drawings. The accompanying drawings are mainly simplified schematic diagrams, which only schematically illustrate the basic structure of the present invention. Therefore, only elements related to the present invention are indicated in these drawings. And the displayed components are not drawn based on the number, shape, size ratio, etc. of the actual implementation. The actual size of the actual implementation is a selective design, and the layout of the components may be more complicated.

Please refer to Figure 1 to Figure 3. The biaxial tensile testing machine 1 of this embodiment is used to stretch a thin plate-shaped tensile test piece 2 to obtain biaxial tensile plastic forming properties. The biaxial tensile testing machine 1 includes: a die set group 11. Two pairs of inclined plane fixing blocks 12, two pairs of inclined plane slider sets 13 and four optical scales 14. The mold base group 11 includes a first mold base 111 and a second mold base 112, which can face each other, respectively, and are positioned with a plurality of guide posts 1121 corresponding to the guide post bushing 1111, and then are separated vertically or pressure is applied. The ground is close to each other perpendicularly; two pairs of inclined plane fixing blocks 12 (as shown in Figure 1, inclined plane fixing blocks 12a, 12b are a pair, and inclined plane fixing blocks 12c, 12d are another pair), which form an angle along each other. A first axis X and a second axis Y are arranged on the first mold base 111, and each inclined surface fixing block 12 (12a, 12b, 12c or 12d) is provided with another inclined surface facing the same axial direction The fixed inclined surface 121 with the same inclined angle of the fixed block 12 (for example, the inclined fixed block 12a is provided with a fixed inclined surface 121a facing the inclined fixed block 12b; the inclined fixed block 12b is provided with a fixed inclined surface 121b facing the inclined fixed block 12a; the inclined fixed block 12c is arranged There is a fixed inclined surface 121c facing the inclined fixed block 12d; the inclined fixed block 12d is provided with a fixed inclined surface 121d) facing the inclined fixed block 12c; the inclination angles of the four fixed inclined surfaces 121 (121a, 121b, 121c, 121d) are the same; two pairs The inclined sliding block group 13 (13a and 13b is a pair, 13c and 13d is the other pair), respectively corresponding to and parallel to the two pairs of inclined fixed blocks 12 (inclined fixed blocks 12a, 12b, 12c, 12d) and set in On the second mold base 112, each inclined slide block group 13 (13a, 13b, 13c and 13d) includes a linear slide 131 (the linear slide 131 includes the first linear slide 131a, 131b and the second linear slide Rails 131c, 131d), an inclined sliding block 132 (132a, 132b, 132c, 132d) that can slide freely on the linear sliding rail 131, the inclined sliding block 132 (132a and 132b is the first linear sliding rail, and 132c and 132d) are provided with a sliding parallel to the corresponding fixed inclined surface 121 (121a, 121b, 121c, 121d) Inclined surface 1321 (1321a, 1321b, 1321c, 1321d). The front end of the inclined surface slider 132 facing the other inclined surface slider 132 in the same axial direction is provided with a load gauge 1322 (1322a, 1322b, 1322c, 1322d), the load gauge 1322 A test piece chuck 1323 (1323a, 1323b, 1323c, 1323d) is provided on a measuring part 13221 (13221a, 13221b, 13221c, 13221d) of the front end surface, and the test piece chuck 1323 (1323a, 1323b, 1323c, 1323d) It is used to fix a tensile test piece 2; four optical rulers 14 (14a, 14b, 14c, 14d) are set on the second mold base 112, and are respectively used to sense the first axial X-slope slider The signal of the movement of the group 13 and the second axial Y-slope slider group 13 is converted into the moving size.

In one embodiment, as shown in FIG. 3. The biaxial tensile testing machine 1 further includes a tensile test piece 2, which has four cross-shaped ends 21, each end 21 is provided with a perforation 211, and each end 21 is correspondingly placed in the test piece. Between the pair of clamping nozzles 13232 of the sheet chuck 1323, and the fastener 1324 passes through the perforation 211 between the pair of clamping nozzles 13232 and the two clamping nozzles 13232 to clamp the cross-shaped tensile test piece 2 in Between the four inclined sliding blocks 132.

As shown in Figure 2, Figure 4 and Figure 5A, 5B. In this embodiment, based on the above-mentioned components, when testing the tensile test piece 2, first fix the tensile test piece 2 to the test piece chuck 1323 parallel to the first axis X and parallel to the second axis Y. Above, each inclined sliding block 132 moves on its corresponding linear sliding rail 131 and can respectively pass an initial position S1 and a stretching position S2. When each inclined sliding block 132 clamps the cross-shaped tensile test piece 2 When, the inclined sliding block (132a, 132b) parallel to the first axis X and the inclined sliding block (132c, 132d) parallel to the second axis Y are located at the initial position S1, and the sliding inclined surface 1321 Align the fixed inclined surface 121 of the corresponding inclined surface fixed block 12, when the mold base group 11 is closed and pressurized, so that the first mold base 111 and the second mold base 112 are close to each other, the first axis X The inclined sliders (132a, 132b) are pressed by the inclined fixed blocks (12a, 12b) to slide equidistantly to the outside (that is, the same axis, the opposite side of the other inclined slider 132), and the other second axis The inclined sliders (132c, 132d) in the Y direction are respectively pressed against the inclined surface fixing blocks (12c, 12d) and slide outward, so that the inclined sliders (132a, 132b), 132b and 132b in the first axis X The inclined sliding block (132c, 132d) of the second axis Y is moved to the tensile position S2, and the test of the tensile test piece 2 is completed. And in this process, Data such as the moving distance of each inclined slider 132 and the corresponding load gauge 1322 load change will be transmitted to a control system, as shown in FIG. 2.

As shown in Figure 2 and Figure 4. When the first mold base 111 and the second mold base 112 are pressed and approached perpendicularly to each other, the inclined sliding block 132a parallel to the first axial direction X moves in the opposite direction of the other inclined sliding block 132b in the coaxial direction. And the inclined slider 132c parallel to the second axis Y moves in the opposite direction of the coaxial inclined slider 132d, and the inclined sliders (132a, 132b, 132c, 132d) move to their corresponding pull In the extended position, the first mold base 111 and the second mold base 112 stop to press close to each other vertically, and are separated vertically from each other.

In the above embodiment, the first mold base 111 is an upper mold base and the second mold base 112 is a lower mold base. However, the first mold base 111 may be a lower mold base and the second mold base 112 is an upper mold base. Implementation of the mold base.

As shown in FIG. 4, in one embodiment, the test piece chuck 1323 (1323a, 1323b, 1323c, 1323d) includes a base 13231, a pair of clamping nozzles 13232, and a fastener 1324, and the base 13231 is arranged at The measuring part 13221, the pair of chucking nozzles 13232 are assembled on the end surface of the base 13231 by a T-shaped slider sliding groove assembly 132322 (for example, as shown in FIG. 3, upper and lower T-shaped slides are provided on the base 13231). The grooves 1332222 respectively form corresponding T-shaped sliding blocks 1332221 in the two clamping nozzles 13232, and the T-shaped sliding blocks 1332221 are inserted into the T-shaped sliding grooves 1323222), and the pair of clamping nozzles 13232 respectively have a through hole 132321 corresponding to the position. The fastener 1324 can pass through the two through holes and 132321 tightly fix the pair of clamping nozzles 13232 (for example, as shown in FIG. 3, the bolt 13241 is passed through the two clamping nozzles 13232 and then screwed with a nut 13242).

In one embodiment, the sliding inclined surface 1321 of each inclined sliding block 132 and/or the fixed inclined surface 121 of each inclined fixed block 12 is a bolt-locked non-lubricating wear-resistant block, and can be used in the non-lubricating wear-resistant block. A precision washer locked on the inclined surface slider 132 and/or the inclined surface fixing block 12 is arranged below to facilitate fine adjustment of the position of the inclined surface slider 132, so as to facilitate the coaxial fixation of the two inclined surface sliders 132 or the two coaxial inclined surfaces The center position of the block 12 is aligned with the center position of the tensile test piece 2.

In an embodiment, the fixed inclined surfaces 121 of the inclined surface fixing blocks 12 and the sliding inclined surfaces 1321 of the inclined surface sliders 132 can be changed or adjusted to another batch of different inclination angles to change different tensile strains. The rate ratio, as shown in Figures 6A to 6C and Figures 7A to 7C, when the inclination angle of the fixed inclined surface 121 is 45 degrees, the inclination angle of the sliding inclined surface 1321 should also be set to 45 degrees accordingly. When the angle is 33.69 degrees, the inclination angle of the sliding slope 1321 should also be set to 33.69 degrees. When the inclination angle of the fixed slope 121 is 26.56 degrees, the inclination angle of the sliding slope 1321 should also be set to 26.56 degrees. As shown in FIG. 7A, when the inclination angle of the fixed inclined surface 121 and the sliding inclined surface 1321 are the same 45 degrees, the inclined surface slider 132 and the inclined surface fixed block 12 contact each other and then continue to approach vertically, the inclined surface of the inclined surface fixed block 12 The ratio of the vertical movement process PV to the corresponding horizontal movement process PH of the inclined surface slider 132 is 1:1 (that is, when the fixed inclined surface 121 does not move, when the inclined surface slider 132 rises vertically by a distance L, the inclined surface slides The block 132 will move horizontally for 1 distance L) at the same time; when the inclination angle of the fixed inclined surface 121 and the sliding inclined surface 1321 are 33.69 degrees, the inclined sliding block 132 and the inclined fixed block 12 are in contact with each other and then continue to approach vertically , The ratio of the vertical movement process PV' of the inclined plane fixed block 12 to the corresponding horizontal movement process PH' of the inclined plane slider 132 is 1:1.5 (that is, when the fixed inclined plane 121 is not moving, the inclined plane slider 132 is vertical When rising by 1 distance L, the inclined sliding block 132 will simultaneously move horizontally by 1.5 distances L); when the inclination angle of the fixed inclined surface 121 and the sliding inclined surface 1321 are both 26.56 degrees, the inclined surface sliding block 132 and the inclined fixed block 12 are mutually After the contact, when continuing to approach vertically, the ratio of the vertical movement process PV" of the inclined surface fixed block 12 to the corresponding horizontal movement process PH" of the inclined surface slider 132 is 1:2 (that is, the fixed inclined surface 121 does not move In this case, when the inclined sliding block 132 rises vertically by a distance L, the inclined sliding block 132 will move horizontally for two distances L) at the same time.

In one embodiment, the first mold base 111 and the second mold base 112 are provided with a plurality of stop blocks, so that when the first mold base 111 and the second mold base 112 are vertically close to each other, they can be used The stop blocks 15 on one mold base abut the corresponding stop blocks 15 on the other mold base to control the minimum vertical proximity of the first mold base 111 and the second mold base 112 to each other. distance. In addition, in the first mode A removable cap 151 can be added to the stop block 15 of the base 111 and the second mold base 112, so that after the inclination angle of the fixed inclined surface 121 and the sliding inclined surface 1321 is changed, the second mold base 112 can be installed as needed. The stop block 15 is added with a cap 151 to adjust (enlarge) the minimum mold clamping distance of the first mold base 111 and the second mold base 112 to avoid collision during mold clamping.

The above implementation forms only illustrate the principles, characteristics and effects of this creation, and are not intended to limit the scope of implementation of this creation. Anyone who is familiar with this technique can deal with the above without violating the spirit and scope of this creation. Modifications and changes to the implementation form. Any equivalent changes and modifications made by using the contents disclosed in this creation shall still be covered by the following patent application scope.

1‧‧‧Biaxial Tensile Testing Machine

11‧‧‧Mould base group

111‧‧‧First mold base

1111‧‧‧Guide column bushing

112‧‧‧Second mold base

1121‧‧‧Guide Post

12,12a,12b,12c,12d‧‧‧inclined fixed block

121a,121b,121c,121d‧‧‧Fixed slope

13,13a,13b,13c,13d‧‧‧inclined slider group

131‧‧‧Linear slide

131a,131b‧‧‧The first linear slide

131c,131d‧‧‧Second linear slide

132,132a,132b,132c,132d‧‧‧inclined slider

1321, 1321a, 1321b, 1321c, 1321d‧‧‧sliding slope

1322a, 1322b, 1322c, 1322d‧‧‧Loading gauge

13221‧‧‧Measurement Department

1323a, 1323b, 1323c, 1323d‧‧‧Test piece chuck

14‧‧‧Optical scale

15‧‧‧Stop block

2‧‧‧Tensile test piece

X‧‧‧First axis

Y‧‧‧Second axis

Claims (10)

A biaxial tensile testing machine is used to stretch a thin plate-shaped tensile test piece to obtain biaxial tensile plastic forming properties. The biaxial tensile testing machine includes: a die set, which includes a first The mold base and a second mold base can face each other separately, and after being positioned with a plurality of guide pillars corresponding to the guide pillar bushings, they are vertically separated from each other or close to each other with pressure; two pairs of inclined fixed blocks are respectively two Two are arranged on the first mold base along a first axis and a second axis that form an included angle with each other, and each inclined surface fixing block is provided with a same inclined angle of the other inclined surface fixing block facing the same axial direction The four fixed inclined planes have the same inclination angle; two pairs of inclined plane slide blocks are respectively corresponding to and parallel to the two pairs of inclined plane fixed blocks and are arranged on the second mold base, and each inclined plane slider set includes A linear slide rail, an inclined sliding block that can slide freely on the linear sliding rail, the inclined sliding block is provided with a sliding inclined surface parallel to the corresponding fixed inclined surface, and the inclined sliding block faces the other in the same axial direction The front end of the inclined sliding block is provided with a load gauge, and a test piece chuck is arranged on a measuring part of the front end of the load gauge, and the test piece chuck is used to fix a tensile test piece; and four optical rulers are arranged On the second mold base, it is used to sense the movement signal of the first and second axial slant slider groups, and convert it into a movement size. The biaxial tensile testing machine according to claim 1, wherein the first mold base is an upper mold base and the second mold base is a lower mold base. The biaxial tensile testing machine according to claim 1, wherein the test piece chuck includes a base, a pair of clamping mouths and a fastener, the base is arranged on the measuring part, and the pair of clamping mouths are A T-shaped slider chute The upper and lower components are arranged on the end surface of the seat body, the pair of clamping nozzles respectively have a corresponding through hole, and the fastener can pass through the two through holes to tightly fix the pair of clamping nozzles. The biaxial tensile testing machine described in claim 3 further includes: the tensile test piece has four cross-shaped ends, each end is provided with a perforation, and each end is placed correspondingly Between the pair of clamping nozzles of the test piece chuck, and the fastener is passed between the pair of clamping mouths and the perforation, and the cross-shaped tensile test piece is clamped between the four inclined sliders . The biaxial tensile testing machine as described in claim 4, wherein each inclined sliding block moves on its corresponding linear slide rail and can pass through an initial position and a tensile position respectively. When each inclined sliding block is clamped When the cross-shaped tensile test piece is located at its corresponding initial position, its sliding slope is aligned with the fixed slope of the corresponding slope fixed block. The biaxial tensile testing machine according to claim 5, wherein when the first mold base and the second mold base are pressurized and approached perpendicularly to each other, the inclined sliding block parallel to the first axial direction is directed coaxially The other inclined sliding block moves in the opposite direction, and the inclined sliding block parallel to the second axis moves in the opposite direction of the coaxial inclined sliding block, and until the inclined sliding blocks move to their corresponding stretch positions At this time, the first mold base and the second mold base stop being vertically pressurized to approach each other, and are vertically separated from each other. The biaxial tensile testing machine described in claim 1, wherein the sliding slope of each inclined sliding block is a bolt-locked non-lubricating wear-resistant block, and a precision gasket can be arranged under the non-lubricating wear-resistant block for convenience Fine-tune the position of the sliding slider. For the biaxial tensile testing machine described in claim 7, each of the fixed slopes is a non-lubricated wear-resistant block that is locked by a bolt, and a precision gasket can be set under the non-lubricated wear-resistant block to facilitate fine-tuning of the fixed slide. The location of the block. The biaxial tensile testing machine according to claim 1 or 7, wherein the first mold base and the second mold base are provided with a plurality of stop blocks, so that the first mold base and the second mold base are mutually When approaching vertically, the stop blocks on one of the mold bases can be used to press against the corresponding stop blocks on the other mold base to control the verticality of the first mold base and the second mold base. The minimum distance to approach. The biaxial tensile testing machine according to claim 1, wherein the fixed inclined surfaces of the inclined surface fixing blocks and the sliding inclined surfaces of the inclined surface sliders can be changed or adjusted to another batch of different inclination angles. Different tensile strain rate ratios.

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