Spring flat steel elastic attenuation resistance detection device for automobile plate spring

Abstract

The utility model relates to a spring flat steel elastic attenuation resistance detection device for an automobile plate spring, and belongs to the technical field of material detection. The device comprises a fixing mechanism, a motor and a guide rod of a power loading mechanism, a computer, a sphere diameter instrument, a pressure sensor and a power supply, the fixing mechanism comprises a rectangular frame, an upper supporting structure and a lower supporting structure, the two sides of the plate spring are supported through the upper supporting structure and the lower supporting structure, the motor is installed in the center of the lower transverse support and connected with the guide rod through a motor shaft, the guide rod penetrates through the lower transverse support, the top of the guide rod is connected into the pressure sensor, and the pressure sensor makes contact with the upper supporting structure. The sphere diameter instrument is assembled in the center of the upper transverse support and connected with a computer through a signal line, the pressure sensor is connected with the computer through a signal line, the computer is connected with a motor through a signal line, and the motor is connected with a power source through a power line. The detection device finally evaluates the elastic attenuation resistance of the spring flat steel, and provides better guidance for plate spring material selection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a detection device, specifically a spring flat steel elastic attenuation resistance detection device for automobile plate spring belongs to material detection technical field. BACKGROUND

[0002] In recent years, the rapid development of automobile industry promotes the renewal iteration of automobile design concept, method and technology. The improvement of automobile design and manufacturing level puts forward higher requirements for automobile materials and parts. As one of the important parts of automobile, the steel plate spring plays a role of buffering and damping on the automobile suspension, and the steel plate spring is simply called plate spring. The spring flat steel is the main raw material of the plate spring. Therefore, producing and using high-performance and high-quality spring flat steel has become the consensus of the industry. Therefore, the spring flat steel must have very good comprehensive performance, in addition to strength, it also requires excellent fatigue performance, elastic attenuation resistance, corrosion resistance and delayed fracture resistance.

[0003] Among them, the elastic attenuation is essentially a phenomenon of plastic deformation of materials under the action of dynamic and static load at a relatively low temperature such as room temperature, which is gradual and hidden and cannot be easily found. From the safety point of view, the automobile body must be kept within a certain range, that is, the reduction of the body height with time is minimized. The elastic attenuation resistance is the ability of a material to resist micro-plastic deformation or load capacity reduction, and we want to select materials with excellent elastic attenuation resistance through the elastic attenuation resistance of the spring flat steel to meet the needs of the automobile plate spring.

[0004] Different types of springs have different stress states, and the derived elastic attenuation resistance testing device is also different. The existing detection device and method are only suitable for spiral springs. There is no special detection device to detect the elastic attenuation resistance of the spring flat steel, so a device is needed to evaluate the elastic attenuation resistance of the spring flat steel. In engineering practice, under the condition of equivalent performance, the material with greater elastic attenuation resistance is preferred. The greater the elastic attenuation resistance of the spring flat steel, the less likely the plate spring is to be permanently deformed, thereby providing guidance for plate spring material selection. UTILITY MODEL CONTENTS

[0005] The utility model aims at: in view of the problems existing in the prior art, propose a kind of spring flat steel elastic attenuation resistance detection device with simple structure, reasonable, reliable implementation, high sensitivity, maximum improve detection precision, also can reflect the automation of test process, accurately identify various spring flat steel elastic attenuation resistance, provide better guidance for material selection.

[0006] In order to achieve the above object, the utility model discloses a spring flat spring elastic attenuation resistance detection device for automobile leaf spring, including spring flat sample, its characterized in that: the detection device includes fixed mechanism, power loading mechanism, computer, ball diameter appearance, pressure sensor and power, the fixed mechanism includes rectangular frame and rectangular frame inboard upper support structure, lower support structure, and it contains several longitudinal, lateral support, the rectangular frame includes upper lateral support, lower lateral support, left longitudinal support and right longitudinal support, and is formed with the vertical rectangular frame by the upper, lower lateral support and left, right longitudinal support upper segment corresponding composition one, through the upper support structure formation to the sample left, right side support while making the support point and sample direct contact, through the lower support structure formation to the sample left, right side end support while making the support point and sample direct contact, the power loading mechanism includes motor and guide rod, the motor is installed at the lower lateral support bottom center, is connected through the motor shaft guide rod, simultaneously makes guide rod pass through the lower lateral support, continues the travel and makes guide rod top access pressure sensor, and pressure sensor is connected with the upper support structure, the ball diameter appearance is assembled through the upper lateral support center place guide hole and ensures the contact with the sample center when detecting, the ball diameter appearance is connected with the computer through signal line, and the pressure sensor is connected with the computer through signal line, and the computer is connected with the motor through signal line, and the motor is connected with the power through power line.

[0007] Further, the upper support structure includes short lateral support, two inner support columns, the short lateral support is supported by the guide rod, and the short lateral support is connected with the pressure sensor at the intersection with the guide rod, so that the pressure sensor is assembled at the bottom center of the short lateral support, one end of the two inner support columns is vertically fixed to the corresponding left and right ends of the short lateral support, the other end of the two inner support columns supports the corresponding left and right sides of the sample near the center, and the two inner support columns apply pressure to the sample.

[0008] Further, the pressure sensor adopts a high-precision pressure sensor with a sensitivity of 2.0±0.05 mV / V to improve the measurement accuracy, the load change of the pressure sensor output and the curvature change of the ball diameter instrument are input into the computer through the signal line, and the corresponding application program in the computer records and processes; when the curvature change exceeds the rated range, the signal of the ball diameter instrument is amplified and input into the computer, and the computer gives an instruction to the motor, and the motor rotates by a certain angle according to the set direction and step angle, so that the curvature is kept in the rated range.

[0009] Further, the two inner and outer support columns, the short transverse support and the sample are left and right symmetrical with the center of the guide rod.

[0010] Further, the short transverse support is greater than 1 / 2 of the length of the lower transverse support, but less than the full length of the lower transverse support; the length of the inner support column is less than that of the outer support column, and both the inner support column and the outer support column are in a structure of being narrow at the top and wide at the bottom.

[0011] Further, the bottom of the left and right longitudinal supports is vertically fixed on the same horizontal plane of the workbench, the whole detection is carried out at room temperature, and the detection environment is kept constant.

[0012] Further, the power supply includes a direct current power supply and an alternating voltage stabilizing power supply, and the direct current power supply provides voltage for the motor; in order to ensure the stability of the input voltage, an alternating voltage stabilizer is added to provide the alternating voltage stabilizing power supply.

[0013] The utility model discloses a simple structure, and is specially used for detecting spring flat steel elastic attenuation resistance, and the loading process runs stably, and the performance is reliable, realizes intelligent measurement at normal temperature, and real-time output stress-time curve. Reach the purposes of automatic detection, automatic output data and automatic analysis. Adopt the high-precision pressure sensor with the sensitivity of 2.0±0.05 mV / V to improve the measurement accuracy, reach the degree of data change is small record in the test process, and greatly improve the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described below in combination with the drawings.

[0015] Figure 1 It is the structure schematic diagram of the utility model.

[0016] Among them: A-sample, 1-computer, 2-ball diameter instrument, 3-pressure sensor, 4-power supply, 5-upper transverse support, 5'-lower transverse support, 6-left longitudinal support, 6'-right longitudinal support, 7-motor, 8-guide rod, 9-short transverse support, 10-inner support column, 11-outer support column. DETAILED DESCRIPTION

[0017] This embodiment of the invention provides a device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs, comprising a spring flat steel sample A, which is as follows: Figure 1 As shown, the testing device includes a fixing mechanism, a power loading mechanism, a computer 1, a ball diameter gauge 2, a pressure sensor 3, and a power supply 4. The fixing mechanism includes a rectangular frame and an upper and lower support structure inside the rectangular frame. It contains several longitudinal and transverse supports. The rectangular frame includes an upper transverse support 5, a lower transverse support 5', a left longitudinal support 6, and a right longitudinal support 6'. The upper transverse support 5, the lower transverse support 5', and the upper sections of the left longitudinal support 6 and the right longitudinal support 6' correspond to form a vertical rectangular frame. The upper support structure provides support to the left and right sides of the central area of ​​sample A, while ensuring that the support points are in direct contact with sample A. The lower support structure provides support to the sample A. The left and right side supports of sample A ensure direct contact between the support points and sample A. The power loading mechanism includes a motor 7 and a guide rod 8. The motor 7 is installed at the bottom center of the lower transverse support 5' and is connected to the guide rod 8 via the motor shaft. Simultaneously, the guide rod 8 passes through the lower transverse support 5' and continues its stroke until the top of the guide rod 8 connects to the pressure sensor 3, and the pressure sensor 3 contacts the upper support structure. The ball diameter meter 2 is assembled through the guide hole at the center of the upper transverse support 5 to ensure contact with the center of sample A during testing. The ball diameter meter 2 is connected to the computer 1 via a signal line, the pressure sensor 3 is connected to the computer 1 via a signal line, the computer 1 is connected to the motor 7 via a signal line, and the motor 7 is connected to the power supply 4 via a power line.

[0018] In this embodiment 1: the upper support structure includes a short transverse support 9 and two inner support columns 10. The short transverse support 9 is supported by a guide rod 8. A pressure sensor 3 is connected at the junction of the short transverse support 9 and the guide rod 8. The synchronous pressure sensor 3 is mounted at the center of the bottom of the short transverse support 9. One end of each of the two inner support columns 10 is vertically fixed to the corresponding left and right ends of the short transverse support 9. The other ends of the two inner support columns 10 supportively contact the left and right sides of the sample A near the center area, and the two inner support columns 10 apply pressure to the sample A. The lower support structure includes a lower transverse support... The support 5' and two external support columns 11 are connected to each other. One end of the two external support columns 11 is vertically fixed to the left and right sides of the lower horizontal support 5', respectively. The other end of the two external support columns 11 is in support contact with the left and right sides of the sample A. The two external support columns 11 apply a supporting force to the sample A. The motor 7 drives the guide rod 8 to move the short horizontal support 9 to adjust the loading and adjust the force on the sample A. The force on the sample A is a four-point bending stress, and the stress points are centrally symmetrical. The central part of the sample A is uniformly bent, and the stress distribution on the outside of the sample A is uniform.

[0019] Combination Figure 1In this embodiment, a high-precision pressure sensor 3 with a sensitivity of 2.0±0.05mV / V is used to improve the measurement accuracy. The load change output by the pressure sensor 3 and the curvature change output by the spherometer 2 are input into the computer 1 through signal lines, and the corresponding application program in the computer 1 records and processes them. When the curvature change exceeds the rated range, the signal of the spherometer 2 is amplified and then input into the computer 1. The computer 1 gives instructions to the motor 7, which rotates a certain angle according to the set direction and step angle. The motor 7 drives the guide rod 8 and moves the short transverse support 9, adjusting the stress of the sample A so that the curvature remains within the rated range.

[0020] In the above device: the short transverse support 9 is required to be longer than half the length of the lower transverse support 5' but shorter than the full length of the lower transverse support 5'; the inner support column 11 is shorter than the outer support column 12; the left and right longitudinal supports 6, 6' are vertically fixed on the same horizontal plane of the workbench; the two inner support columns 10 and the two outer support columns 11, the short transverse support 9, and the sample A are left-right symmetrical with the center of the guide rod 8. The entire detection process is carried out at room temperature and the detection device is kept constant. The power supply 4 of the above device includes a direct current power supply and an alternating current stabilized power supply. The direct current power supply provides voltage for the motor. To ensure stable input voltage, an alternating current stabilizer is added to provide alternating current stabilized power supply.

[0021] The specific detection process is as follows: prepare the sample A according to the relevant technical requirements. The device detection is divided into two stages. In the first stage, the motor 7 drives the guide rod 8 and moves the short transverse support 9 to load and plastically deform the sample A, and at the same time, the sample A is stressed under four-point bending stress. Then enter the second stage, the computer 1 sets the test duration and the curvature range. During this process, the curvature of the sample A remains within the rated range. Since the motor 7 moves the guide rod 8 and the short transverse support 9, the load changes, and the pressure sensor 3 detects the stress value change of the sample A and transmits it to the computer 1. The computer 1 records and processes the data output by the pressure sensor 3 using the corresponding application program, thus obtaining the stress value change curve within the test duration.

[0022] Finally, the computer 1 processes the stress-time curve output by the application program, and then processes the stress-time curve using the appropriate application program. Typically, the slope value at a specific time point on the curve is calculated, and the resulting value represents the stress relaxation rate.

[0023] The device can be replaced with spring flat steel samples of different materials for testing, thereby obtaining the stress relaxation rates of different spring flat steels.

[0024] According to the above, the smaller the stress relaxation rate, the greater the elastic attenuation resistance of the spring flat steel. In the application of automobile leaf spring, when the remaining performance is equivalent, the material with greater elastic attenuation resistance of the spring flat steel is preferred, the greater the elastic attenuation resistance of the spring flat steel, the less likely the leaf spring is permanently deformed, thereby providing better guidance for the material selection of the automobile leaf spring.

[0025] In addition to the above embodiments, the utility model can have other implementation manners. Any technical scheme formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs, comprising a spring flat steel sample, characterized in that: The detection device includes a fixing mechanism, a power loading mechanism, a computer, a ball diameter meter, a pressure sensor, and a power supply. The fixing mechanism includes a rectangular frame and an upper and lower support structure inside the rectangular frame, which contains several longitudinal and transverse supports. The rectangular frame includes an upper transverse support, a lower transverse support, a left longitudinal support, and a right longitudinal support. The upper and lower transverse supports and the upper sections of the left and right longitudinal supports correspond to form a vertical rectangular frame. The upper support structure provides support to the left and right sides of the sample near the center area, while ensuring that the support points are in direct contact with the sample. The lower support structure provides support to the left and right ends of the sample, while ensuring that the support points are in direct contact with the sample. The power loading mechanism includes a motor and a guide rod. The motor is installed at the bottom center of the lower transverse support and is connected to the guide rod through the motor shaft. The guide rod passes through the lower transverse support synchronously and continues to travel until the top of the guide rod is connected to the pressure sensor, and the pressure sensor is connected to the upper support structure. The ball diameter gauge is assembled through the guide hole at the center of the upper horizontal support to ensure contact with the center of the sample during testing. The ball diameter gauge is connected to the computer via a signal line, the pressure sensor is connected to the computer via a signal line, the computer is connected to the motor via a signal line, and the motor is connected to the power supply via a power line.

2. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 1, characterized in that: The upper support structure includes a short transverse support and two inner support columns. The short transverse support is supported by a guide rod. A pressure sensor is connected at the junction of the short transverse support and the guide rod, and the pressure sensor is simultaneously mounted at the center of the bottom of the short transverse support. One end of each of the two inner support columns is vertically fixed to the corresponding left and right ends of the short transverse support, and the other end of each inner support column is in support contact with the left and right sides of the sample near the center. The two inner support columns apply pressure to the sample. The lower support structure includes a lower transverse support and two outer support columns. One end of each of the two outer support columns is vertically fixed to the corresponding left and right ends of the lower transverse support, and the other end of each outer support column is in support contact with the corresponding left and right sides of the sample. The two outer support columns apply a supporting force to the sample. The motor drives the guide rod and moves the short transverse support to adjust the loading and simultaneously adjust the force on the sample. The force on the sample is a four-point bending stress, and the stress points are centrally symmetrical. The central part of the sample is uniformly bent, and the stress distribution on the outside of the sample is uniform.

3. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 1, characterized in that: The pressure sensor is a high-precision pressure sensor with a sensitivity of 2.0±0.05mV / V to improve measurement accuracy. The load change output by the pressure sensor and the curvature change output by the ball diameter meter are both input to the computer via signal lines. The corresponding application program in the computer records and processes the data. When the curvature change exceeds the rated range, the signal from the ball diameter meter is amplified and then input to the computer. The computer then issues a command to the motor, which rotates a certain angle according to the set direction and step angle to keep the curvature within the rated range.

4. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 2, characterized in that: Two inner and outer support columns, a short transverse support, and the sample are symmetrical about the center of the guide rod.

5. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 2, characterized in that: The short transverse support is longer than 1 / 2 the length of the lower transverse support, but shorter than the total length of the lower transverse support; the length of the inner support column is shorter than the length of the outer support column, and both the inner and outer support columns are in a structure that is narrower at the top and wider at the bottom.

6. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 1, characterized in that: The bottoms of the left and right longitudinal supports are vertically aligned and fixed on the same horizontal plane of the workbench. The entire testing process is carried out at room temperature, and the testing environment is kept constant.

7. The device for detecting the elastic decay resistance of spring flat steel for automotive leaf springs according to claim 1, characterized in that: The power supply includes a DC power supply and an AC regulated power supply. The DC power supply provides voltage to the motor. To ensure stable input voltage, an AC voltage regulator is added to provide AC regulated power.

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