CN111337348A - Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method - Google Patents
Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method Download PDFInfo
- Publication number
- CN111337348A CN111337348A CN202010263808.4A CN202010263808A CN111337348A CN 111337348 A CN111337348 A CN 111337348A CN 202010263808 A CN202010263808 A CN 202010263808A CN 111337348 A CN111337348 A CN 111337348A
- Authority
- CN
- China
- Prior art keywords
- stretching
- base
- mechanisms
- biaxial
- guide rail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 98
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 34
- 230000008859 change Effects 0.000 claims description 20
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of tensile testing machines, and discloses a biaxial stretching device with a large-range adjustable stretching speed and a biaxial stretching method, wherein the biaxial stretching device comprises a base, four stretching mechanisms are arranged on the base, and each stretching mechanism comprises a lead screw module, a stretching module and a roller linear guide rail pair; the roller linear guide rail pair is respectively connected with the stretching module and the lead screw module; each stretching mechanism is provided with a stretching pressure sensor; two of the four stretching mechanisms are oppositely arranged along the x direction, the other two stretching mechanisms of the four stretching mechanisms are oppositely arranged along the y direction, and the four stretching mechanisms are arranged on the base in a cross shape. The invention has compact structure, controls the single-shaft feeding speed by two servo motors, realizes the stretching speed in different ranges by matching with the nut rotating type ball screw pair, and realizes the large-range adjustment of the stretching speed, stable stretching and higher control precision compared with the traditional bidirectional stretching testing machine.
Description
Technical Field
The invention relates to the field of tensile testing machines, in particular to a biaxial stretching device with a large-range adjustable stretching speed and a biaxial stretching method.
Background
In the plate forming process, the plate is in a complex stress state in most cases, and the plate surface is generally in a bidirectional stress state. The deformation behavior of the plate is obviously different under different stress states. Therefore, the related research on the deformation behavior of the plate material is far from enough by only adopting the material performance obtained by the traditional unidirectional tensile test method, and the excavation of the bidirectional loading mechanical property of the plate material and the establishment of an accurate material model are urgent. The method controls the load or displacement of two shafts to enable a central area to be in different stress strain states, so that any yield point of a double-pull area under different loading paths is obtained, and the biaxial tension test becomes a research hotspot in the field at present.
The existing tension and compression testing machine in the world mainly based on hydraulic control, for example, national patent document CN104101539A, discloses a hydraulic bidirectional tension testing machine, which comprises an oil pump, loading oil cylinders I and II, a positioning oil cylinder, reverse ejection rods I and II, reverse ejection beams I and II, clamp crossbeams I and II, clamps I and II, etc., after a sample is fixedly arranged on the clamp, the oil pump is used for injecting oil to the cylinder body A part of the loading oil cylinders I and II, a pushing piston is used for driving the reverse ejection beams I and II respectively, the reverse ejection beams I and II drive the clamp crossbeams I and II through the reverse ejection rods I and II, the clamp crossbeams I and II drive the clamps I and II to respectively move reversely left and right to achieve the purpose of bidirectional tension of the sample, otherwise, the oil pump is used for injecting oil to the cylinder body B part of the loading oil cylinders I and II, pushing the piston to enable the left and right clamp beam combinations to return; the A part and the C part of the cylinder body of the positioning oil cylinder are filled with oil, the positioning piston shaft returns, the movable cross beam moves, the B part of the cylinder body of the positioning oil cylinder is filled with oil, the positioning piston shaft extends out to enter the positioning hole, and the movable cross beam is positioned, so that the purpose of adjusting the test space is achieved.
The adjustable range of the tensile rate is small, large-range speed regulation cannot be realized, and the problems that the tensile test is difficult to control accurately, the complexity of the device is high, and the on-site sanitary condition of the testing machine is poor are solved.
Disclosure of Invention
The invention aims to provide a biaxial stretching device with a stretching speed adjustable in a large range and a biaxial stretching method, so that the problems in the prior art are solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a biaxial stretching device with a large-range adjustable stretching speed comprises a base (1), wherein four stretching mechanisms are arranged on the base (1), and each stretching mechanism comprises a lead screw module, a stretching module and a roller linear guide rail pair; the roller linear guide rail pair is respectively connected with the stretching module and the lead screw module; each stretching mechanism is provided with a stretching pressure sensor (2-1-1); two of the four stretching mechanisms are oppositely arranged along the x direction, the other two stretching mechanisms of the four stretching mechanisms are oppositely arranged along the y direction, and the four stretching mechanisms are arranged on the base (1) in a cross shape.
Further, the screw module comprises a stretching seat (2-1-2), a synchronous belt (2-1-6), a nut rotating type ball screw pair, a lower servo motor (2-1-7) and a lower planetary gear reducer (2-1-8); the stretching seat (2-1-2) is provided with an upper servo motor (2-1-4) and an upper planetary gear reducer (2-1-5); the nut rotating type ball screw assembly comprises a fixed end bearing seat (2-1-9), a ball screw (2-1-10) and a supporting end bearing seat (2-1-12); two ends of the ball screw (2-1-10) are respectively connected with the fixed end bearing seat (2-1-19) and the supporting end bearing seat (2-1-12); the ball screw (2-1-10) is provided with a nut seat (2-1-11), and the nut seat (2-1-11) is provided with a screw nut; one end of the upper planetary gear reducer (2-1-5) is connected with the upper servo motor (2-1-4), and the other end of the upper planetary gear reducer (2-1-5) is connected with the screw nut through the synchronous belt (2-1-6); one end of the lower planetary gear reducer (2-1-8) is connected with the lower servo motor (2-1-7), and the other end of the lower planetary gear reducer (2-1-8) is connected with the ball screw (2-1-10); the fixed end bearing seat (2-1-9) is fixedly connected with the base (1).
Further, the roller linear guide rail pair comprises a guide rail, a sliding block (2-1-18) and a stud for a workbench are arranged on the guide rail, and the sliding block is connected with the stretching seat (2-1-2); the nut seat is connected with the workbench on the guide rail through a nut seat connecting frame by a stud.
Further, the stretching module comprises a stretching cylinder (2-1-13), an extension frame (2-1-14) and a clamp mounting seat (2-1-15); the stretching cylinder (2-1-13) is connected with the clamp mounting seat (2-1-15); the clamp mounting seat (2-1-15) is provided with a clamp (2-1-16), and the clamp (2-1-16) is used for clamping a test piece.
Further, the base (1) comprises a central lathe bed and four peripheral lathe beds; the four side surfaces of the central lathe bed are respectively connected with the four peripheral lathe beds; the central lathe bed comprises a central base; each peripheral lathe bed comprises an upper base (1-1) and a lower base (1-2), and the upper base (1-1) is connected with the lower base (1-2); the four stretching mechanisms are respectively connected with the four upper bases.
Furthermore, the lower part of the base (1) is provided with a plurality of horizontal adjusting ground feet (1-3); the horizontal adjusting ground feet (1-3) are used for adjusting the horizontal position of the base (1).
Furthermore, each stretching mechanism is also provided with a travel switch (2-1-19); the travel switch (2-1-19) is arranged on one side of the roller linear guide rail pair through a screw, and the travel switch (2-1-19) is used for controlling the safety position of the sliding block (2-1-18).
Furthermore, the number of the travel switches (2-1-19) is two, wherein one travel switch is positioned at the starting position of the movement of the slide block (2-1-18), and the other travel switch is positioned at the ending position of the movement of the slide block (2-1-18).
Furthermore, each stretching mechanism is also provided with a grating ruler (2-1-20); the grating ruler (2-1-20) is positioned at the other side of the roller linear guide rail pair, and the grating ruler (2-1-20) is used for measuring the displacement of the clamp.
A biaxial stretching method with a widely adjustable stretching speed comprises the following steps:
s1) respectively clamping four clamps of the four stretching mechanisms to four clamping edges of the test piece;
s2) connecting the input end of the upper computer with the tension and pressure sensor, the travel switch and the grating ruler of each stretching mechanism respectively; the output end of the upper computer is respectively connected with two servo motors of each stretching mechanism; the two servo motors comprise an upper servo motor and a lower servo motor;
s3) determining whether the test piece is biaxially stretched or uniaxially stretched, and if uniaxially stretched, proceeding to step S4); if biaxial stretching is performed, the process proceeds to step S5);
s4) judging whether the unidirectional stretching is carried out along the x direction or the y direction, if the unidirectional stretching is carried out along the x direction, setting the initial parameters of the two stretching mechanisms in the x direction by using an upper computer, and entering the step S6); if the unidirectional stretching is carried out along the y direction, setting initial parameters of the two stretching mechanisms in the y direction by using the upper computer, and entering the step S6);
s5) setting initial parameters of the four stretching mechanisms by using an upper computer, and entering the step S6);
s6) the upper computer is used for controlling the stretching mechanism to stretch the test piece, the tension pressure sensor is used for detecting tension change information borne by the test piece in real time, the grating ruler is used for measuring position change information of the sliding block in real time, and the tension change information and the position change information are uploaded to the upper computer in real time;
s7) detecting whether the slide block reaches the shortest stroke or the longest stroke in real time by using a travel switch, and controlling the motion range of each stretching mechanism by using the travel switch;
s8) analyzing the tensile force change information of the test piece and the position change information of the sliding block by using the upper computer to obtain the unidirectional tensile property or the bidirectional tensile property of the test piece.
The initial parameters comprise load and the rotating speed of a servo motor of the stretching mechanism; the invention can not only perform unidirectional stretching (x direction or y direction), but also perform bidirectional stretching (x direction and y direction), and sets the rotating speed of the servo motor of the corresponding stretching mechanism according to stretching in different directions. The invention adopts a mode that two groups of different motor reducers (an upper planetary gear reducer and a lower planetary gear reducer) are respectively driven, a ball screw is positioned at the lower side of a guide rail, and a nut seat is connected with a workbench on the guide rail by a stud through a connecting frame. Step S6), the upper computer is used for controlling the stretching mechanism to stretch the test piece, the invention can realize stretching in three rotating speed ranges by using a differential principle, the stretching in the three rotating speed ranges comprises stretching in a high-speed range, stretching in a medium-speed range and stretching in a low-speed range, when the stretching in the high-speed range is required, two servo motors of each stretching mechanism control the single-shaft feeding speed together in the same steering direction, and meanwhile, the nut rotating type ball screw pair is matched, so that the high-speed stretching is realized; when the intermediate-speed range stretching is needed, an upper servo motor for driving the screw rod nut to rapidly feed and an upper planetary gear reducer rotate independently, an output shaft of the upper planetary gear reducer (namely the other end of the upper planetary gear reducer) drives a synchronous belt to rotate, and the screw rod nut is driven through the synchronous belt so as to perform intermediate-speed stretching; when low-speed range stretching is needed, two servo motors of each stretching mechanism control the single-shaft feeding speed together in opposite directions, and meanwhile, the nut rotating type ball screw pair is matched, so that low-speed stretching is realized.
The invention has the beneficial effects that: (1) the four stretching mechanisms are arranged around the central seat in a cross shape, so that the structure is compact; (2) by utilizing a differential principle, two servo motors are adopted to control the single-shaft feeding speed, and the nut rotating type ball screw pair is matched, so that the stretching speeds in different ranges can be realized, and compared with the traditional bidirectional stretching testing machine, the large-range adjustment of the stretching speed is realized; (3) when the low speed is tensile, servo motor can work under higher rotational speed to guarantee that the tensile more steady of testing machine low speed, control accuracy is higher.
Drawings
Fig. 1 is a schematic structural diagram of a biaxial stretching device with a widely adjustable stretching rate according to the first embodiment.
Fig. 2 is a top view of a biaxial stretching device with a widely adjustable stretching rate according to the first embodiment.
Fig. 3 is a front view of a base of a biaxial stretching device with a widely adjustable stretching rate according to the first embodiment.
Fig. 4 is a front view of the stretching mechanism according to the first embodiment.
Fig. 5 is a schematic diagram of a stretching mechanism according to the first embodiment.
Fig. 6 is a top view of the stretching mechanism according to the first embodiment.
Fig. 7 is a left side view of the stretching mechanism of the first embodiment.
1. The device comprises a base, 1-1 parts, an upper base, 1-2 parts, a lower base, 1-3 parts, a horizontal adjusting ground foot, 2-1 parts, an x forward stretching mechanism, 2-1-1 parts, a tension pressure sensor, 2-1-2 parts, a stretching seat, 2-1-4 parts, an upper servo motor, 2-1-5 parts, an upper star wheel speed reducer, 2-1-6 parts, a synchronous belt, 2-1-7 parts, a lower servo motor, 2-1-8 parts, a lower star wheel speed reducer, 2-1-9 parts, a fixed end bearing seat, 2-1-10 parts, a ball screw, 2-1-11 parts, a nut seat, 2-1-12 parts, a supporting end bearing seat, 2-1-13 parts, a stretching cylinder, 2-1-14 parts, an extending frame, 2-1-15 parts, a horizontal adjusting ground, The device comprises a clamp mounting seat, 2-1-16 parts, a clamp, 2-1-17 parts, a guide rail, 2-1-18 parts, a sliding block, 2-1-19 parts, a travel switch, 2-1-20 parts, a grating ruler, 2-1-21 parts, a limiting stopper, 2-2 parts, a y positive stretching mechanism, 2-3 parts, an x negative stretching mechanism and 2-4 parts, a y negative stretching mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
In a first embodiment, a biaxial stretching device with a widely adjustable stretching rate, as shown in fig. 1 and 2, includes a base 1, where the base 1 includes a central bed and four peripheral beds; the four side surfaces of the central lathe bed are respectively connected with the four peripheral lathe beds; the central lathe bed comprises a central base; each peripheral lathe bed comprises an upper base 1-1 and a lower base 1-2, and the upper base 1-1 is connected with the lower base 1-2 through screws; the four stretching mechanisms are respectively connected with the four upper bases. The lower part of the base 1 is provided with a plurality of horizontal adjusting ground feet 1-3; the horizontal adjustment feet 1-3 are used to adjust the horizontal position of the base 1 (see fig. 3).
Four stretching mechanisms are fixedly arranged on the base 1, and are respectively an x positive stretching mechanism 2-1, a y positive stretching mechanism 2-2, an x negative stretching mechanism 2-3 and a y negative stretching mechanism 2-4. The x positive direction stretching mechanism 2-1, the y positive direction stretching mechanism 2-2, the x negative direction stretching mechanism 2-3 and the y negative direction stretching mechanism 2-4 have the same structure. Each stretching mechanism comprises a lead screw module, a stretching module and a roller linear guide rail pair; the screw module is connected with the stretching module, and the roller linear guide rail pair is respectively connected with the stretching module and the screw module.
Fig. 4, 6 and 7 are a front view, a plan view and a left side view, respectively, of the stretching mechanism of the first embodiment. Each stretching mechanism is provided with a stretching pressure sensor 2-1-1; two of the four stretching mechanisms are oppositely arranged along the x direction, the other two stretching mechanisms of the four stretching mechanisms are oppositely arranged along the y direction, and the four stretching mechanisms are arranged on the base (1) in a cross shape. The x positive stretching mechanism 2-1 is fixedly arranged on the upper base positioned in the x positive direction, the y positive stretching mechanism 2-2 is fixedly arranged on the upper base positioned in the y positive direction, the x negative stretching mechanism 2-3 is fixedly arranged on the upper base positioned in the x negative direction, and the y negative stretching mechanism 2-4 is fixedly arranged on the upper base positioned in the y negative direction.
The roller linear guide rail pair comprises a guide rail, a sliding block 2-1-18 and a stud for a workbench are arranged on the guide rail, and the nut seat is connected with the workbench on the guide rail through a nut seat connecting frame through the stud.
The screw module comprises a stretching seat 2-1-2, a synchronous belt 2-1-6, a nut rotating type ball screw pair, a lower servo motor 2-1-7 and a lower planetary gear reducer 2-1-8; the sliding block 2-1-18 is connected with the stretching seat 2-1-2, and the stretching seat 2-1-2 is fixed on the sliding block 2-1-18. The stretching seat 2-1-2 is provided with an upper servo motor 2-1-4 and an upper planetary gear reducer 2-1-5; the nut rotating type ball screw assembly comprises a fixed end bearing seat 2-1-9, a ball screw 2-1-10 and a supporting end bearing seat 2-1-12; two ends of the ball screw 2-1-10 are respectively connected with a fixed end bearing seat 2-1-19 and a supporting end bearing seat 2-1-12; the ball screw 2-1-10 is provided with a nut seat 2-1-11, and the nut seat 2-1-11 is provided with a screw nut; one end of the upper planetary gear reducer 2-1-5 is connected with the upper servo motor 2-1-4 through a bolt, and the other end of the upper planetary gear reducer 2-1-5 is connected with a screw nut through a synchronous belt 2-1-6, so that high-speed stretching is realized. One end of the lower planetary gear reducer 2-1-8 is connected with the lower servo motor 2-1-7 to realize power transmission. The other end of the downstream planetary reducer 2-1-8 is connected with a ball screw 2-1-10, and the downstream planetary reducer 2-1-8 drives the ball screw 2-1-10 to rotate, so that slow-speed stretching is performed (see fig. 5). The fixed end bearing block 2-1-9 is fixedly connected with the base 1.
The stretching module comprises a stretching cylinder 2-1-13, an extension frame 2-1-14 and a clamp mounting seat 2-1-15; the stretching cylinder 2-1-13 is connected with the clamp mounting seat 2-1-15; the clamp mounting seat 2-1-15 is provided with a clamp 2-1-16, and the clamp is used for clamping a test piece.
Each stretching mechanism is also provided with a travel switch 2-1-19; the travel switches 2-1-19 are arranged on one side of the roller linear guide rail pair through screws, and the travel switches 2-1-19 are used for controlling the safety positions of the sliding blocks 2-1-18. The number of the travel switches 2-1-19 is two, wherein one travel switch is positioned at the starting position of the movement of the slide block 2-1-18 and used for limiting the shortest travel so as to avoid the occurrence of car collision. The other travel switch is positioned at the end position of the movement of the sliding blocks 2-1-18 and used for limiting the maximum travel of the sliding blocks so as to prevent the sliding blocks from exceeding the travel and damaging equipment.
Each stretching mechanism is also provided with a grating ruler 2-1-20; the grating ruler 2-1-20 is positioned at the other side of the roller linear guide rail pair, and the grating ruler 2-1-20 is used for measuring the displacement of the clamp. In the first embodiment, the stretching mechanism is further provided with a limiting device 2-1-21, and the limiting device 2-1-21 is used for limiting the stretching mechanism to operate in a safe range.
A biaxial stretching method with a widely adjustable stretching speed comprises the following steps:
s1) respectively clamping four clamps of the four stretching mechanisms to four clamping edges of the test piece;
s2) connecting the input end of the upper computer with the tension and pressure sensor, the travel switch and the grating ruler of each stretching mechanism respectively; the output end of the upper computer is respectively connected with two servo motors of each stretching mechanism; the two servo motors comprise an upper servo motor and a lower servo motor;
s3) determining whether the test piece is biaxially stretched or uniaxially stretched, and if uniaxially stretched, proceeding to step S4); if biaxial stretching is performed, the process proceeds to step S5);
s4) judging whether the unidirectional stretching is carried out along the x direction or the y direction, if the unidirectional stretching is carried out along the x direction, setting the initial parameters of the two stretching mechanisms in the x direction by using an upper computer, and entering the step S6); if the unidirectional stretching is carried out along the y direction, setting initial parameters of the two stretching mechanisms in the y direction by using the upper computer, and entering the step S6);
s5) setting initial parameters of the four stretching mechanisms by using an upper computer, and entering the step S6);
s6) the upper computer is used for controlling the stretching mechanism to stretch the test piece, the tension pressure sensor is used for detecting tension change information borne by the test piece in real time, the grating ruler is used for measuring position change information of the sliding block in real time, and the tension change information and the position change information are uploaded to the upper computer in real time;
s7) detecting whether the slide block reaches the shortest stroke or the longest stroke in real time by using a travel switch, and controlling the motion range of each stretching mechanism by using the travel switch;
s8) analyzing the tensile force change information of the test piece and the position change information of the sliding block by using the upper computer to obtain the unidirectional tensile property or the bidirectional tensile property of the test piece.
The initial parameters include the load and the servomotor speed of the tensioning mechanism. The invention adopts a Siemens servo motion control system and completes four-axis cooperative motion in two directions through the Siemens servo motion control system. The invention can not only perform unidirectional stretching (x direction or y direction), but also perform bidirectional stretching (x direction and y direction), and sets the rotating speed of the servo motor of the corresponding stretching mechanism according to stretching in different directions. The invention adopts a mode that two groups of different motor reducers (an upper planetary gear reducer and a lower planetary gear reducer) are respectively driven, a ball screw is positioned at the lower side of a guide rail, and a nut seat is connected with a workbench on the guide rail by a stud through a nut seat connecting frame. Step S6), the upper computer is used for controlling the stretching mechanism to stretch the test piece, the invention can realize stretching in three rotating speed ranges by using a differential principle, the stretching in the three rotating speed ranges comprises the high-speed-rate-range stretching of 3000-63000 mm/min, the medium-speed-range stretching of 120-3000 mm/min and the low-speed-range stretching of 0-120 mm/min, when the high-speed-rate-range stretching is needed, two servo motors of each stretching mechanism control the single-shaft feeding speed together in the same steering direction, and the nut rotating type ball screw pair is matched at the same time, so that the high-speed stretching is realized; when the intermediate-speed range stretching is needed, an upper servo motor for driving the screw rod nut to rapidly feed and an upper planetary gear reducer rotate independently, an output shaft of the upper planetary gear reducer (namely the other end of the upper planetary gear reducer) drives a synchronous belt to rotate, and the screw rod nut is driven through the synchronous belt so as to perform intermediate-speed stretching; when low-speed range stretching is needed, two servo motors of each stretching mechanism control the single-shaft feeding speed together in opposite directions, and meanwhile, the nut rotating type ball screw pair is matched, so that low-speed stretching is realized.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention adopts a Siemens servo motion control system and completes four-axis cooperative motion in two directions through the Siemens servo motion control system. And load, displacement and strain closed-loop control is adopted, so that the response speed is high, and the control precision is high. The nut rotating type ball screw assembly adopts the screw nut as the active drive, greatly reduces the rotational inertia of a mechanical motion system, improves the limit rotating speed of the system and is easy to realize high-speed transmission compared with the traditional ball screw. In addition, the double-servo-motor reducer drives the ball screw, so that the bidirectional stretching speed can be adjusted in a large range. The four shafts of the invention are relatively independent (namely the four stretching mechanisms are relatively independent), not only can carry out a biaxial stretching test or a unidirectional stretching test, but also can carry out a unidirectional compression test, namely a loading and unloading test, thereby providing a foundation for researching material resilience and having multiple purposes. The tension sensor is arranged, so that the real-time change of the tension borne by the cross-shaped test piece is tested, the structure is compact, the measurement precision is high, and the unbalance loading resistance is high. The two travel switches are arranged on the side edge of the stretching mechanism and used for controlling two travel directions, namely the slide block is ensured not to exceed the travel of the grating ruler, and the vehicle collision accident is also ensured not to occur. According to the invention, the grating ruler is arranged on the side edge of the stretching mechanism, the grating ruler is fixed on the upper base, the position change of the front stretching base is measured in real time through the grating ruler, and the resolution is high.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (10)
1. The bidirectional stretching device with the stretching speed adjustable in a large range is characterized by comprising a base (1), wherein four stretching mechanisms are arranged on the base (1), and each stretching mechanism comprises a lead screw module, a stretching module and a roller linear guide rail pair; the roller linear guide rail pair is respectively connected with the stretching module and the lead screw module; each stretching mechanism is provided with a stretching pressure sensor (2-1-1); two of the four stretching mechanisms are oppositely arranged along the x direction, the other two stretching mechanisms of the four stretching mechanisms are oppositely arranged along the y direction, and the four stretching mechanisms are arranged on the base (1) in a cross shape.
2. The biaxial stretching device with the widely adjustable stretching rate as claimed in claim 1, wherein the screw module comprises a stretching base (2-1-2), a synchronous belt (2-1-6), a nut-and-rotating type ball screw pair, a lower servo motor (2-1-7) and a lower planetary gear reducer (2-1-8); the stretching seat (2-1-2) is provided with an upper servo motor (2-1-4) and an upper planetary gear reducer (2-1-5); the nut rotating type ball screw assembly comprises a fixed end bearing seat (2-1-9), a ball screw (2-1-10) and a supporting end bearing seat (2-1-12); two ends of the ball screw (2-1-10) are respectively connected with the fixed end bearing seats (2-1-19) and the supporting end bearing seats (2-1-12); the ball screw (2-1-10) is provided with a nut seat (2-1-11), and the nut seat (2-1-11) is provided with a screw nut; one end of the upper planetary gear reducer (2-1-5) is connected with the upper servo motor (2-1-4), and the other end of the upper planetary gear reducer (2-1-5) is connected with the screw nut through the synchronous belt (2-1-6); one end of the lower planetary gear reducer (2-1-8) is connected with the lower servo motor (2-1-7), and the other end of the lower planetary gear reducer (2-1-8) is connected with the ball screw (2-1-10); the fixed end bearing seat (2-1-9) is fixedly connected with the base (1).
3. The biaxial stretching device with the widely adjustable stretching rate of claim 2, characterized in that the roller linear guide rail pair comprises a guide rail, a slide block (2-1-18) and a stud for a workbench are arranged on the guide rail, and the slide block is connected with the stretching base (2-1-2); the nut seat (2-1-11) is connected with the workbench on the guide rail through a nut seat connecting frame by a stud.
4. The biaxial stretching device with the widely adjustable stretching rate of claim 1 or 3, wherein the stretching die set comprises a stretching cylinder (2-1-13), an extension frame (2-1-14) and a clamp mounting seat (2-1-15); the stretching cylinder (2-1-13) is connected with the clamp mounting seat (2-1-15); the clamp mounting seat (2-1-15) is provided with a clamp (2-1-16), and the clamp (2-1-16) is used for clamping a test piece.
5. Biaxial stretching device with widely adjustable stretching rate according to claim 4, characterized in that the base (1) comprises a central bed and four peripheral beds; the four side surfaces of the central bed body are respectively connected with the four peripheral bed bodies; the central lathe bed comprises a central base; each peripheral lathe bed comprises an upper base (1-1) and a lower base (1-2), and the upper base (1-1) is connected with the lower base (1-2); the four stretching mechanisms are respectively connected with the four upper bases.
6. The biaxial stretching device with the widely adjustable stretching rate of claim 1 or 5, characterized in that the lower part of the base (1) is provided with a plurality of horizontally adjustable anchor feet (1-3); the horizontal adjusting ground feet (1-3) are used for adjusting the horizontal position of the base (1).
7. Biaxial stretching device with widely adjustable stretching rate according to claim 6, characterized in that each stretching mechanism is further provided with a travel switch (2-1-19); the travel switch (2-1-19) is arranged on one side of the roller linear guide rail pair through a screw, and the travel switch (2-1-19) is used for controlling the safety position of the sliding block (2-1-18).
8. Biaxial stretching device with widely adjustable stretching rate according to claim 7, characterized in that the number of the stroke switches (2-1-19) is two, one of which is located at the starting position of the movement of the slide (2-1-18) and the other is located at the ending position of the movement of the slide (2-1-18).
9. The biaxial stretching device with the widely adjustable stretching rate of claim 1 or 8, wherein each stretching mechanism is further provided with a grating ruler (2-1-20); the grating ruler (2-1-20) is located on the other side of the roller linear guide rail pair, and the grating ruler (2-1-20) is used for measuring the displacement of the clamp.
10. A biaxial stretching method with a widely adjustable stretching rate, applied to the biaxial stretching device with a widely adjustable stretching rate according to any one of claims 1 to 9, comprising the steps of:
s1) respectively clamping four clamps of the four stretching mechanisms to four clamping edges of the test piece;
s2) connecting the input end of the upper computer with the tension and pressure sensor, the travel switch and the grating ruler of each stretching mechanism respectively; the output end of the upper computer is respectively connected with two servo motors of each stretching mechanism; the two servo motors comprise an upper servo motor and a lower servo motor;
s3) determining whether the test piece is biaxially stretched or uniaxially stretched, and if uniaxially stretched, proceeding to step S4); if biaxial stretching is performed, the process proceeds to step S5);
s4) judging whether the unidirectional stretching is carried out along the x direction or the y direction, if the unidirectional stretching is carried out along the x direction, setting the initial parameters of the two stretching mechanisms in the x direction by using an upper computer, and entering the step S6); if the unidirectional stretching is carried out along the y direction, setting initial parameters of the two stretching mechanisms in the y direction by using the upper computer, and entering the step S6);
s5) setting initial parameters of the four stretching mechanisms by using the upper computer, and entering the step S6);
s6) the upper computer is used for controlling the stretching mechanism to stretch the test piece, the tension pressure sensor is used for detecting tension change information borne by the test piece in real time, the grating ruler is used for measuring position change information of the sliding block in real time, and the tension change information and the position change information are uploaded to the upper computer in real time;
s7) detecting whether the slide block reaches the shortest stroke or the longest stroke in real time by using a travel switch, and controlling the motion range of each stretching mechanism by using the travel switch;
s8) analyzing the tensile force change information of the test piece and the position change information of the sliding block by using the upper computer to obtain the uniaxial tension performance or the biaxial tension performance of the test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263808.4A CN111337348A (en) | 2020-04-07 | 2020-04-07 | Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263808.4A CN111337348A (en) | 2020-04-07 | 2020-04-07 | Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111337348A true CN111337348A (en) | 2020-06-26 |
Family
ID=71180726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010263808.4A Pending CN111337348A (en) | 2020-04-07 | 2020-04-07 | Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111337348A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649285A (en) * | 2021-01-15 | 2021-04-13 | 山东大学 | Bidirectional tensile testing machine for producing geogrids |
| CN114184369A (en) * | 2021-12-14 | 2022-03-15 | 广东电网有限责任公司 | Safety belt detection device |
-
2020
- 2020-04-07 CN CN202010263808.4A patent/CN111337348A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112649285A (en) * | 2021-01-15 | 2021-04-13 | 山东大学 | Bidirectional tensile testing machine for producing geogrids |
| CN114184369A (en) * | 2021-12-14 | 2022-03-15 | 广东电网有限责任公司 | Safety belt detection device |
| CN114184369B (en) * | 2021-12-14 | 2023-06-27 | 广东电网有限责任公司 | Safety belt detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106525585A (en) | A bidirectional tension-compression testing machine and a bidirectional tension-compression testing method | |
| CN203405477U (en) | Micro in-situ mechanical tester based on scanning electron microscope | |
| CN111337348A (en) | Biaxial stretching device with stretching rate adjustable in large range and biaxial stretching method | |
| CN203405370U (en) | Material micromechanics performance testing platform under stretching, bending and twisting loads | |
| CN104816174A (en) | Flexible fixture capable of precisely controlling angle in plane | |
| CN102507320B (en) | Single-power two-way stretching method and device | |
| CN101850473B (en) | Laser processing equipment of connecting rod initial cracking groove of engine | |
| CN109406277B (en) | Drop hammer type dynamic biaxial stretching testing device | |
| CN103389243A (en) | Micro material mechanical performance testing platform under stretching-bending-twisting multi-loads | |
| CN108037017A (en) | A kind of lead screw gear formula plate control with changed scale loading based on servomotor is double to draw pilot system | |
| CN111766143B (en) | Universal testing machine | |
| CN203337492U (en) | In-situ nanoindentation tester based on adjustable stretching-bending pre-load | |
| WO2002064355A1 (en) | Pressurizer | |
| CN105830755A (en) | Dynamic counterweight device of high-branch pruning machine and control method for dynamic counterweight device | |
| US11215534B2 (en) | Wheel testing machine detects performance through application of radial thrust | |
| CN102513491A (en) | Booster for servo press | |
| CN212059682U (en) | Bidirectional stretching device with stretching speed adjustable in large range | |
| CN206177714U (en) | Two -way mechanical test machine of pressing that draws | |
| CN212621436U (en) | Electronic jar capability test device | |
| CN103894467A (en) | Servo stretch forming machine | |
| CN112748000B (en) | Multi-axis testing machine and testing method for testing performance of carbon fiber composite material | |
| JP3860999B2 (en) | Mold clamping device and mold clamping method of injection compression molding machine | |
| CN105572156B (en) | A kind of two axle precision movement platforms for X-ray diffractometer | |
| CN202387896U (en) | Booster for servo press | |
| CN203764721U (en) | Servo stretch former |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |