CN112782001A - Yield stress measuring device - Google Patents
Yield stress measuring device Download PDFInfo
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- CN112782001A CN112782001A CN202011644125.XA CN202011644125A CN112782001A CN 112782001 A CN112782001 A CN 112782001A CN 202011644125 A CN202011644125 A CN 202011644125A CN 112782001 A CN112782001 A CN 112782001A
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- mounting
- yield stress
- measuring device
- force application
- stress measuring
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- 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
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- 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
- G01N2203/0019—Compressive
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- 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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- 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 discloses a yield stress measuring device which comprises a mounting frame, a force application assembly and a deformation detection assembly, wherein the force application assembly comprises a force application rod extending along the vertical direction, the force application rod can be movably mounted to the mounting frame up and down, and the lower end of the force application rod is used for abutting against a metal piece to be measured; the deformation detection assembly is arranged on the mounting frame and provided with a test part which is used for abutting against the surface of the metal piece to be tested and can be arranged in a vertically telescopic mode. The force applying rod is abutted against the metal piece to be tested to apply a force on the surface of the metal piece to deform the material, the height of the metal piece to be tested before and after deformation is adapted through the vertical extension and contraction of the testing part, the height difference of the metal piece before and after deformation is compared to confirm whether the metal piece is subjected to plastic deformation, and the force value applied by the force applying rod is the yield stress of the metal piece.
Description
Technical Field
The invention relates to the technical field of stress measurement, in particular to a yield stress measuring device.
Background
In the existing method for measuring the yield stress of the local structural feature of the thin metal part, a pressure device generally applies pressure to the local surface of the metal material to be measured, and a height gauge is used for measuring the height before and after the pressure is applied to the local surface to judge whether the plastic deformation reaches 0.01mm or not, so that the yield stress is determined. However, the measurement process requires applying force gradually and measuring the height of the thin metal part repeatedly, so that a large measurement error exists.
Disclosure of Invention
The invention mainly aims to provide a yield stress measuring device which is wide in application range and convenient to operate and aims to solve the problem that the existing measuring mode is large in measuring error.
In order to achieve the above object, the present invention provides a yield stress measuring apparatus, comprising:
a mounting frame;
the force application assembly comprises a force application rod extending along the vertical direction, the force application rod can be movably mounted to the mounting frame up and down, and the lower end of the force application rod is abutted to the metal piece to be tested; and the number of the first and second groups,
the deformation detection assembly is arranged on the mounting frame and provided with a test part which is abutted to the surface of the metal piece to be tested and can be stretched up and down.
Optionally, the mounting frame is provided with a mounting part, and the mounting part is provided with a first mounting hole in a vertically through manner;
the force application assembly further comprises a tray positioned above the mounting part, and the tray is used for placing weights;
the upper end of the force application rod penetrates through the first mounting hole and is fixedly connected with the tray.
Optionally, the mounting portion further has two positioning holes disposed through the mounting portion and spaced from the first mounting hole;
the lower extreme of tray is equipped with along upper and lower to extending, and two locating arms that the interval set up, two the locating arm wears to locate two in the locating hole.
Optionally, the deformation detecting assembly further comprises:
the fixing rod extends along the vertical direction, and the upper end of the fixing rod is movably mounted to the mounting rack;
the movable bracket is movably arranged on the fixed rod along the vertical direction; and the number of the first and second groups,
and the height detector is detachably mounted on the movable bracket, and a probe of the height detector forms the testing part.
Optionally, an installation part is arranged on the installation frame, a second installation hole is arranged in the installation part in a vertically through manner, and a first threaded hole communicated with the second installation hole is formed in one side end of the installation part;
the upper end of the fixed rod movably penetrates through the second mounting hole;
the deformation detection assembly further comprises a first adjusting bolt, wherein the first adjusting bolt is installed in the first threaded hole in a threaded mode and penetrates through the first threaded hole to abut against the fixed rod.
Optionally, deformation detection subassembly still includes the test needle, the test needle have from top to bottom to the first needle section that extends, with the lower extreme of first needle section links to each other and the second needle section that the slope set up, with the second needle section links to each other and the third needle section that extends from top to bottom, the upper end of first needle section with the probe fixed connection of height detection appearance, the lower extreme of third needle section is used for the butt on the surface of the metalwork that awaits measuring.
Optionally, the mounting bracket further includes a support arm extending vertically and adjustable in height, and a mounting arm located at an upper end of the support arm, and the mounting arm is used for movably mounting the force application rod.
Optionally, the support arm includes a first sleeve and a second sleeve which are sequentially sleeved, an inner side wall of the first sleeve is provided with a second threaded hole in a penetrating manner, and the second sleeve is movably mounted in the first sleeve;
the yield stress measuring device further comprises a second adjusting bolt, wherein the second adjusting bolt is installed in the second threaded hole in a threaded mode and penetrates through the second threaded hole to abut against the second sleeve.
Optionally, an installation part is arranged on the installation arm, and the distance between the installation part and the support arm is adjustable.
Optionally, a mounting sleeve is arranged at the upper end of the supporting arm, and a third threaded hole is formed in the inner side wall of the mounting sleeve in a penetrating manner;
the mounting arm comprises a mounting plate extending along the horizontal direction, the mounting plate forms the mounting part, an extension arm is arranged at the side end, facing the support arm, of the mounting plate, and the extension arm is movably arranged in the mounting sleeve in a penetrating manner;
the yield stress measuring device further comprises a third adjusting bolt, wherein the third adjusting bolt is installed in the third threaded hole in a threaded mode and penetrates through the third threaded hole to abut against the extension arm.
According to the technical scheme, the force applying rod is abutted against the metal piece to be tested to apply a force on the surface of the metal piece to deform the material, the height of the metal piece to be tested before and after deformation is adapted through the vertical extension and contraction of the testing part, the height difference of the metal piece before and after deformation is compared, and whether the metal piece is plastically deformed or not is determined, and the force applied by the force applying rod is the yield stress of the metal piece. The device has the advantages that the pressing and metal height detection on the metal surface can be realized through the device, the relative position of the mounting frame and the metal piece to be detected is fixed, the operation is simple, the universality is high, the material yield stress of the metal sheet can be detected, the local yield stress of the metal piece can be detected, the measurement error is small, and the obtained detection result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic perspective view of an embodiment of a yield stress measuring apparatus (for detecting metal parts) according to the present invention;
FIG. 2 is a perspective view of one embodiment (an angle) of the yield stress measuring device of FIG. 1;
FIG. 3 is a perspective view of one embodiment (at another angle) of the yield stress measuring apparatus of FIG. 1;
fig. 4 is an enlarged schematic view of a portion a of fig. 1.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indication is involved in the embodiment of the present invention, the directional indication is only used for explaining the relative positional relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Devices or apparatuses for measuring the yield stress of metallic materials are known on the market today, whose platforms are generally small, since the apparatuses are generally used for measuring thin metal pieces, deriving the yield stress of the relevant material, and are not capable of measuring the yield stress at local structural features of the thin metal pieces. The prior method for measuring the yield stress at the local structural feature of the thin metal part comprises the following steps: force is gradually applied to the local feature, then the height of the local feature is measured by a height meter to judge whether plastic deformation is 0.01mm, the applied force is the yield stress of the position, but the force is gradually applied in the measuring process, whether the plastic deformation reaches 0.01mm is repeatedly measured, and the thin metal piece and the height meter need to be repeatedly moved, so that a large measuring error exists.
In view of this, the invention provides a yield stress measuring device, which is used for measuring the yield stress at the local structural feature of a thin metal part and has strong practicability and high precision. Fig. 1 to 4 show an embodiment of a yield stress measuring apparatus according to the present invention.
Referring to fig. 1 to 2, the yield stress measuring device 100 includes an installation frame 1, a force application component 2 and a deformation detection component 3, wherein the force application component 2 includes a force application rod 21 extending in an up-down direction, the force application rod 21 is movably installed to the installation frame 1 in an up-down direction, and a lower end of the force application rod 21 abuts against a metal piece to be measured; deformation detection subassembly 3 sets up mounting bracket 1, deformation detection subassembly 3 has the butt on the surface of the metalwork that awaits measuring, and the test section of flexible setting from top to bottom.
In the technical scheme of the invention, the force application rod 21 is abutted against the metal piece to be tested so as to apply a force on the surface of the metal piece to deform the material, the height of the metal piece to be tested before and after deformation is adapted through the vertical extension and contraction of the test part, the height difference of the metal piece before and after deformation is compared, and whether the metal piece is plastically deformed is determined, wherein the force value applied by the force application rod 21 is the yield stress of the metal piece. The device has the advantages that the pressing and metal height detection on the metal surface can be realized through the device, the relative position of the mounting frame 1 and the metal piece to be detected is fixed, the operation is simple, the universality is high, the material yield stress of the metal sheet can be detected, the local yield stress of the metal piece can be detected, the measurement error is small, and the obtained detection result is more accurate.
The yield stress measuring device 100 provided by the invention is used for measuring and result confirmation based on the principle of material characteristics, and comprises the following specific steps:
the yield stress is determined as the minimum stress at which the material can be permanently deformed when the stress is removed. The yield stress at a structural feature of a metallic material should be the minimum stress value for the minimum permanent deformation as the yield stress for that structural feature; after the elastic deformation of the metal material reaches the limit, the strength of the metal material fluctuates in a small range, and at this time, namely, the plastic deformation starts, the elastic deformation can be recovered, and the plastic deformation can not be recovered. The permanent deformation value is defined as the plastic deformation of 0.01mm at the measured object or the measured structure characteristic; by measuring the relative height difference before and after the force is applied to the measured object or the measured structure, when the obtained result is 0.01mm, the measured object or the measured structure characteristic is judged to have been subjected to plastic deformation, and the force value at the moment is the yield stress of the measured object or the measured structure characteristic.
Specifically, in order to facilitate the application and detection of a force value, an installation part 121 is arranged on the installation frame 1, and a first installation hole is formed in the installation part 121 in a vertically penetrating manner; the force application assembly 2 further comprises a tray 22 positioned above the mounting part 121, and the tray 22 is used for placing weights; the upper end of the force application rod 21 passes through the first mounting hole and is fixedly connected with the tray 22. Through increase the weight in tray 22, play to thereby provide pressure to application of force pole 21 and conduct pressure to the metalwork that awaits measuring on, the weight all has rated weight, the calculation of the power value of being convenient for, and the mode of exerting force is succinct moreover, the operation of being convenient for.
It should be noted that, in other embodiments of the present invention, a mechanical device may be further provided to apply force to the force applying rod 21, so as to improve the automation degree.
Further, the metal piece to be tested has a certain thickness, when the force application rod 21 contacts with the metal piece to be tested, the tray 22 is jacked up, and a certain distance exists between the tray and the mounting portion 121, and in order to ensure stability in the force application process, in the invention, the mounting portion 121 is further provided with two positioning holes which are arranged at intervals with the first mounting hole in a penetrating manner; the lower end of the tray 22 is provided with two positioning arms 221 which extend in the vertical direction and are arranged at intervals, and the two positioning arms 221 penetrate through the two positioning holes. The effect of guaranteeing the levelness of the tray 22 and the perpendicularity of the force application rod 21 is achieved, the force application rod 21 is further guaranteed to be in vertical contact with a measured object, and meanwhile the tray 22 is prevented from rotating with the force application rod 21.
Based on the above embodiment, when the difference between the height changes before and after the deformation of the structural feature of the measured object reaches 0.01mm, the sum of the weights, the tray 22, the two positioning arms 221 and the force application rod 21 is the yield stress of the structural feature of the measured object.
This yield stress measuring device 100 can change the size of tray 22, the length of application of force pole 21 and the length of locating arm 221 to adjust the total mass of application of force subassembly 2, the model selection of being convenient for, thus can test the testee of less yield stress.
It should be noted that, by increasing the thickness of the mounting portion 121 and the length of the positioning arm 221 at the same time, the matching length between the positioning hole and the positioning arm 221 is increased, so that a certain matching distance is ensured, and along with the replacement of the metal piece to be measured, the heights of the tray 22 which is jacked up are different, so that the length of the positioning arm 221 is ensured to meet the requirement of being always matched with the positioning hole, thereby improving the stability.
In order to adapt to the detection of different metal parts, in the present invention, the deformation detecting assembly 3 further includes a fixing rod 31, a movable bracket 32 and a height detector 33, the fixing rod 31 extends along the vertical direction, and the upper end of the fixing rod 31 is movably mounted to the mounting frame 1; the movable bracket 32 is movably mounted on the fixed rod 31 along the up-down direction; the height detector 33 is detachably mounted to the movable bracket 32, and a probe of the height detector 33 forms the test section. Specifically, through changing the height of dead lever 31 uses the metalwork of co-altitude, the mobile setting of dead lever 31 can dodge the metalwork that awaits measuring simultaneously, adjusts movable bracket 32 drives height detection appearance 33 adjustment to the adaptation detects, height detection appearance 33 directly uses current ripe equipment, and the scalable setting of its probe possesses zero setting and digital display function.
Further, in order to facilitate the adjustment and fixation of the fixing rod 31, an installation part 121 is arranged on the installation frame 1, a second installation hole is arranged in the installation part 121 in a vertically through manner, and a first threaded hole communicated with the second installation hole is arranged at one side end of the installation part 121; the upper end of the fixed rod 31 movably penetrates through the second mounting hole; the deformation detection assembly 3 further comprises a first adjusting bolt 34, wherein the first adjusting bolt 34 is installed in the first threaded hole in a threaded manner and penetrates through the first threaded hole to abut against the fixing rod 31. First adjusting bolt 34 has the relative screw thread end and the nut end that sets up, the nut end can directly be screwed manually, through screwing first adjusting bolt 34 makes dead lever 31 supported tightly and with mounting bracket 1 relatively fixed, the pine of unscrewing first adjusting bolt 34 makes the mobile regulation of dead lever 31 is convenient for adjust dead lever 31, simple structure, convenient operation.
The movable bracket 32 is a common bracket for fixing the height detector 33, the height detector 33 is fixed by bolts, and the movable bracket is used for connecting the height detector 33 and the fixed rod 31 and finely adjusting the height of the height detector 33.
After the device is assembled, due to the shape of the height detector 33 and the space limitation of the movable bracket 32, a certain distance exists between the force application rod 21 and the probe of the height detector 33, so that the probe of the height detector 33 cannot directly detect the structural surface on which the force application rod 21 applies the force, for this reason, in an embodiment of the present invention, referring to fig. 4, the deformation detection assembly 3 further includes a test needle 35, where the test needle 35 includes a first needle section extending in an up-down direction, a second needle section connected to a lower end of the first needle section and disposed in an inclined manner, and a third needle section connected to the second needle section and extending in an up-down direction, an upper end of the first needle section is fixedly connected to the probe of the height detector 33, and a lower end of the third needle section is configured to abut against the surface of the metal piece to be detected. The length of the probe of the height detector 33 is prolonged by bending the testing needle 35, and the problem of the distance difference between the probe of the height detector 33 and the force application rod 21 is solved. It should be noted that the diameter of the lower end of the test needle 35 needs to meet the measurement requirement to improve the measurement accuracy, and the test needle 35 is made of a special material and needs to meet a certain hardness requirement.
Furthermore, the mounting rack 1 further comprises a supporting arm 11 extending up and down and adjustable in height, and a mounting arm 12 located at the upper end of the supporting arm 11, wherein the mounting arm 12 is used for movably mounting the force application rod 21. Thereby increasing the adaptability and enlarging the adjusting range of the whole height.
In order to facilitate the adjustment and locking of the support arm 11, the support arm 11 includes a first sleeve 111 and a second sleeve 112 which are sequentially sleeved, the inner side wall of the first sleeve 111 is provided with a second threaded hole in a penetrating manner, and the second sleeve 112 is movably mounted in the first sleeve 111; the yield stress measuring device 100 further comprises a second adjusting bolt 4, wherein the second adjusting bolt 4 is installed in the second threaded hole in a threaded manner and penetrates through the second threaded hole to abut against the second sleeve 112. The second adjusting bolt 4 is provided with a thread end and a nut end which are arranged oppositely, the nut end can be directly screwed manually, and the second adjusting bolt 4 is screwed to enable the second sleeve 112 to be abutted and fixed relative to the first sleeve 111 and loosen the second adjusting bolt 4, so that the second sleeve 112 can be movably adjusted, the height of the supporting arm 11 can be conveniently adjusted, the adjusting in the vertical direction can be realized, the structure is simple, and the operation is convenient.
It should be noted that, a clamp may be sleeved on the outer surface of the second sleeve, and the clamp may be fastened and loosened to fix and adjust the relative movement between the second sleeve and the first sleeve, which will not be described in detail herein.
Can be through be in the surface of second sleeve pipe sets up the scale groove to accurate regulation avoids single regulating variable unreasonable, needs repeated regulation.
In addition, the mounting arm 12 is provided with a mounting portion 121, and a distance between the mounting portion 121 and the support arm 11 is adjustable. Therefore, the adjustment in the horizontal direction is realized, the adaptability is improved, and the adjustment range is expanded.
In order to facilitate the adjustment and locking of the mounting portion 121, referring to fig. 3, a mounting sleeve 113 is disposed at the upper end of the supporting arm 11, and a third threaded hole is formed through an inner side wall of the mounting sleeve 113; the mounting arm 12 comprises a mounting plate extending along the horizontal direction, the mounting plate forms the mounting portion 121, an extension arm 122 is arranged at the side end of the mounting plate facing the support arm 11, and the extension arm 122 is movably arranged in the mounting sleeve 113 in a penetrating manner; the yield stress measuring device 100 further comprises a third adjusting bolt 5, wherein the third adjusting bolt 5 is installed in the third threaded hole in a threaded manner and penetrates through the third threaded hole to abut against the extension arm 122. Through screwing the third adjusting bolt 5, make the extension arm 122 supported tightly and with the installation sleeve 113 relatively fixed, the pine of screwing the third adjusting bolt 5 makes the mobile regulation of extension arm 122 is convenient for adjust the installation department 121 for distance between the support arm 11, thereby realize the regulation of horizontal direction, simple structure, convenient operation.
Can be through the surface of extension arm sets up the scale groove to accurate regulation avoids single regulating variable unreasonable, needs repeated regulation.
Furthermore, the two support arms 11 are respectively located at two side ends of the mounting arm 12, the two side ends of the mounting arm 12 are respectively provided with the extension arm 122 corresponding to the two support arms 11, and the mounting sleeve 113 is arranged at the upper ends of the two support arms 11, so that the stability is better.
In the embodiment of the present invention, the mounting rack 1 further includes a marble base, and the lower ends of the two supporting arms 11 are fixedly mounted on the marble base, so as to play a role of supporting and provide a balance weight of the whole equipment. Is convenient for carrying and using. It should be noted that the metal piece to be detected only needs to be placed on a hard plane parallel to the marble base.
In the testing process of the yield stress measuring device 100, after a single test is finished, in order to ensure the accuracy of the detection result, only the metal piece to be tested needs to be moved to other same structural surfaces or the same type of metal piece is replaced for repeated measurement, and compared with the first result, compared with the traditional measuring method for measuring the yield stress of the local structural characteristics of the metal piece, the measuring device has the advantages of small measurement error and high precision.
The yield stress measuring device 100 provided by the invention comprises the following steps:
firstly, placing a marble base and a measured object of the yield stress measuring device 100 on the same marble platform;
then, the whole height of the device is adjusted through the second adjusting bolt 4, and a 3-5cm pressing space is ensured between the tray 22 and the mounting part 121; then, the lower end face of the force application rod 21 and the lower end of the test needle 35 are ensured to be aligned to the measured structural feature of the measured object by adjusting the first adjusting bolt 34 and the measured object of the movable bracket;
meanwhile, the counterweight is added on the measured object to ensure that the measured object cannot move and deviate in the detection process.
Then, starting the detection, opening the height detector 33 to make the probe of the height detector 33 abut against the structural feature where the object to be detected contacts the force application rod 21, and reading the reading H at the moment1(ii) a Then, weights are placed in the tray 22, after a pause, the tray 22 is lifted to separate the force application rod 21 from the object to be measured, and then the force application rod is readTaking a reading H of the height detector 332；
If it is at this time H1The difference between the H2 and the H2 is 0.01mm, and the sum of the gravity of the weight, the tray 22, the two positioning arms 221 and the force application rod 21 at the moment is the yield stress of the structural feature of the measured object;
if H is1And H2If the difference is less than 0.01mm, the weight is continuously added, and the detection action is repeated until H1And H2The difference reaches 0.01 mm.
It should be noted that, when the weight is placed, the weight of the weight needs to be controlled to be increased each time, and the situation that the force value exceeds the yield stress value due to the fact that the weight of the weight placed at a time is too large is avoided. Specifically, if the number of the tested object samples is only 1, the weights are gradually increased, only 0.1kg of weights are increased at one time, and the yield stress of the tested structural feature of the tested object is obtained by repeating the detection action; if the number of the tested samples is large, weights are increased by adopting a dichotomy, and the yield stress of the tested structural feature of the tested object is obtained by gradually reducing the weight interval and repeating the actions in the detection step; also can be according to experience increase the weight earlier for the first time, perhaps use the thrust gauge earlier and obtain thrust conversion weight gravity through the range estimation, the weight of tentatively confirming the weight, this testing arrangement of rethread tests.
Besides the above detection method, the detection steps may further include: opening the height detector 33, enabling the probe of the height detector 33 to abut against the structural feature of the object to be detected, which is in contact with the force application rod 21, and zeroing the height detector 33; then, placing weights in the tray 22, stopping for a period of time, lifting the tray 22 to separate the force application rod 21 from the measured object, and reading the reading H0 of the height detector 33; if the value of H0 is 0.01mm, the sum of the weights, the tray 22, the two positioning arms 221 and the force application rod 21 is the yield stress of the structural feature of the measured object; if the value of H0 is less than 0.01mm, the weight is continuously added, and the detection action is repeated until the value of H0 reaches 0.01 mm.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A yield stress measuring device, comprising:
a mounting frame;
the force application assembly comprises a force application rod extending along the vertical direction, the force application rod can be movably mounted to the mounting frame up and down, and the lower end of the force application rod is abutted to the metal piece to be tested; and the number of the first and second groups,
the deformation detection assembly is arranged on the mounting frame and provided with a test part which is abutted to the surface of the metal piece to be tested and can be stretched up and down.
2. The yield stress measuring device of claim 1, wherein the mounting frame is provided with a mounting portion, and the mounting portion is provided with a first mounting hole which penetrates vertically;
the force application assembly further comprises a tray positioned above the mounting part, and the tray is used for placing weights;
the upper end of the force application rod penetrates through the first mounting hole and is fixedly connected with the tray.
3. The yield stress measuring device of claim 2, wherein the mounting portion further has two positioning holes formed therethrough spaced from the first mounting hole;
the lower extreme of tray is equipped with along upper and lower to extending, and two locating arms that the interval set up, two the locating arm wears to locate two in the locating hole.
4. The yield stress measuring apparatus of claim 1, wherein the deformation sensing assembly further comprises:
the fixing rod extends along the vertical direction, and the upper end of the fixing rod is movably mounted to the mounting rack;
the movable bracket is movably arranged on the fixed rod along the vertical direction; and the number of the first and second groups,
and the height detector is detachably mounted on the movable bracket, and a probe of the height detector forms the testing part.
5. The yield stress measuring device of claim 4, wherein the mounting frame is provided with a mounting part, a second mounting hole is formed in the mounting part in a vertically penetrating manner, and a first threaded hole communicated with the second mounting hole is formed in one side end of the mounting part;
the upper end of the fixed rod movably penetrates through the second mounting hole;
the deformation detection assembly further comprises a first adjusting bolt, wherein the first adjusting bolt is installed in the first threaded hole in a threaded mode and penetrates through the first threaded hole to abut against the fixed rod.
6. The yield stress measuring device of claim 4, wherein the deformation detecting assembly further comprises a testing needle, the testing needle is provided with a first needle section extending vertically, a second needle section connected with the lower end of the first needle section and arranged obliquely, and a third needle section connected with the second needle section and extending vertically, the upper end of the first needle section is fixedly connected with the probe of the height detector, and the lower end of the third needle section is used for abutting against the surface of the metal piece to be detected.
7. The yield stress measuring device of claim 1, wherein the mounting bracket further comprises a support arm extending up and down and adjustable in height, and a mounting arm at an upper end of the support arm, the mounting arm being movably mounted to the force application rod.
8. The yield stress measuring device of claim 7, wherein the support arm comprises a first sleeve and a second sleeve which are sequentially sleeved, a second threaded hole is formed in the inner side wall of the first sleeve in a penetrating manner, and the second sleeve is movably arranged in the first sleeve;
the yield stress measuring device further comprises a second adjusting bolt, wherein the second adjusting bolt is installed in the second threaded hole in a threaded mode and penetrates through the second threaded hole to abut against the second sleeve.
9. A yield stress measuring device according to claim 7, wherein a mounting portion is provided on the mounting arm, the distance between the mounting portion and the support arm being adjustable.
10. The yield stress measuring device of claim 9, wherein a mounting sleeve is provided at the upper end of the supporting arm, and a third threaded hole is provided through the inner side wall of the mounting sleeve;
the mounting arm comprises a mounting plate extending along the horizontal direction, the mounting plate forms the mounting part, an extension arm is arranged at the side end, facing the support arm, of the mounting plate, and the extension arm is movably arranged in the mounting sleeve in a penetrating manner;
the yield stress measuring device further comprises a third adjusting bolt, wherein the third adjusting bolt is installed in the third threaded hole in a threaded mode and penetrates through the third threaded hole to abut against the extension arm.
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| CN202011644125.XA CN112782001A (en) | 2020-12-30 | 2020-12-30 | Yield stress measuring device |
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| CN202011644125.XA CN112782001A (en) | 2020-12-30 | 2020-12-30 | Yield stress measuring device |
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Cited By (1)
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| CN113790959A (en) * | 2021-09-03 | 2021-12-14 | 电子科技大学(深圳)高等研究院 | Metal sheet yield stress measuring tool and method |
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