Body-in-white static stiffness test method and test platform

Abstract

The invention relates to the technical field of body-in-white static rigidity testing, in particular to a body-in-white static rigidity testing method and a body-in-white static rigidity testing platform, and the method comprises the steps: adjusting the position relation between supporting parts according to the structural characteristics of a body-in-white, installing a front suspension and a rear suspension of the body-in-white on the corresponding supporting parts respectively, and adjusting the supporting parts. All the supporting pieces are only subjected to vertical downward acting force applied by the body-in-white, at least one time of preload is applied to the body-in-white, formal loads are applied to the body-in-white, the formal loads are applied step by step from low to high, data of longitudinal beams of the body-in-white are collected step by step, and the static rigidity of the body-in-white is calculated. The test platform can adjust the supporting position according to the structural characteristics of the body-in-white, eliminate the internal stress of the body-in-white by applying the preload firstly, then apply the formal load step by step, obtain the numerical value of the body-in-white under the multi-stage load for calculation, and improve the accuracy of the test result.

Description

Technical Field

[0001] The invention relates to the technical field of body-in-white static stiffness testing, and in particular to a body-in-white static stiffness testing method and a testing platform. Background Art

[0002] The static stiffness of the body-in-white is one of the performances that the body-in-white structure of commercial vehicles must meet. During the development of commercial vehicle products, the static stiffness of the body-in-white structure must be tested to evaluate whether the developed body-in-white structure meets the static stiffness performance requirements.

[0003] In practice, it is found that internal stress is generated when the body-in-white is assembled and when the body-in-white is installed with the test platform. This is why the values ​​obtained in subsequent torsion tests and bending tests always deviate from the actual values, resulting in reduced accuracy and reliability of the test results.

[0004] Therefore, a body-in-white static stiffness testing method and test platform are urgently needed to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a body-in-white static stiffness testing method and a testing platform, which can make the test results more accurate.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Body-in-white static stiffness test methods include:

[0008] S10, adjusting the positional relationship between the supporting parts according to the structural characteristics of the body in white;

[0009] S20, installing the front suspension and the rear suspension of the body-in-white on the corresponding supporting members respectively;

[0010] S30, adjusting the supporting members so that all the supporting members are only subjected to the vertical downward force exerted by the body-in-white;

[0011] S41, applying at least one preload F to the body-in-white 预 ;

[0012] S42, applying a formal load F to the body-in-white, and the magnitude of the formal load is applied step by step from low to high, and collecting data of the longitudinal beams of the body-in-white step by step, to meet F 预 <F;

[0013] S43. Calculate the static stiffness of the body-in-white based on the above data.

[0014] As a preferred technical solution of the above-mentioned body-in-white static stiffness test method, the above-mentioned support member limits the freedom of movement of the rear suspension of the above-mentioned body-in-white in the front-rear direction.

[0015] As a preferred technical solution for the above-mentioned body-in-white static stiffness test method, the above-mentioned support member limits the freedom of movement of the front suspension of the above-mentioned body-in-white in the front-to-back direction, the left-to-right direction, the vertical direction, the rotation direction around the above-mentioned front-to-back direction, and the rotation direction around the above-mentioned vertical direction.

[0016] A test platform is also provided, which is applicable to the above-mentioned body-in-white static stiffness test method, and the above-mentioned test platform comprises:

[0017] Base;

[0018] A front support assembly, the front support assembly comprising a first bracket and at least two front support members arranged along the left-right direction, the first bracket being slidably arranged on the base along the front-back direction and being lockable with the base, the front support members being slidably connected to the first bracket along the left-right direction and being lockable with the first bracket, and the front support members being used to install the front suspension of the body-in-white;

[0019] A rear support assembly, the rear support assembly includes a second bracket and at least two rear support members arranged along the left and right directions, the second bracket is installed on the base, the rear support members are all slidably arranged on the second bracket along the left and right directions and can be locked with the second bracket, and the rear support members are used to install the rear suspension of the white body.

[0020] As a preferred technical solution for the above-mentioned test platform, the above-mentioned first bracket includes a first adjustment mechanism and a first platform. The above-mentioned first adjustment mechanism connects the above-mentioned base and the above-mentioned first platform, and can adjust the height of the above-mentioned first platform in the vertical direction. The above-mentioned front support members are all slidably set on the above-mentioned first platform.

[0021] As a preferred technical solution for the above-mentioned test platform, the above-mentioned front support member includes a first sliding seat, a first telescopic rod and a first support tray. The above-mentioned first sliding seat can slide relative to the above-mentioned first platform. The above-mentioned first telescopic rod connects the above-mentioned first support tray and the above-mentioned first sliding seat and can adjust the height of the above-mentioned first support tray in the above-mentioned vertical direction.

[0022] As a preferred technical solution of the above-mentioned test platform, the above-mentioned front support member also includes a first connector, the above-mentioned first connector is detachably connected to the above-mentioned first support tray, and the front suspension of the above-mentioned body in white is connected to the above-mentioned first connector through a bearing.

[0023] As a preferred technical solution for the above-mentioned test platform, the above-mentioned second bracket includes a second adjustment mechanism and a second platform, one end of the above-mentioned second adjustment mechanism is connected to the above-mentioned base, and the other end is hinged to the above-mentioned second platform, and the above-mentioned second adjustment mechanism can adjust the height of the above-mentioned second platform in the vertical direction, and can change the height difference between the two ends of the above-mentioned second platform in the above-mentioned left and right directions.

[0024] As a preferred technical solution of the above-mentioned test platform, the above-mentioned second adjustment mechanism includes a loading electric cylinder, a fixed part of the above-mentioned loading electric cylinder is installed on the above-mentioned base, and a telescopic part of the above-mentioned loading electric cylinder is hinged to the above-mentioned second platform.

[0025] As a preferred technical solution of the above-mentioned test platform, the above-mentioned second adjustment mechanism also includes a force sensor, and the above-mentioned force sensor is used to obtain the force condition of the above-mentioned loading electric cylinder.

[0026] As a preferred technical solution for the above-mentioned test platform, the above-mentioned second bracket also includes a first support column, one end of the above-mentioned first support column is connected to the above-mentioned base, and the other end is hinged to the above-mentioned second platform, the above-mentioned first support column can be extended or locked along the above-mentioned vertical direction, and the above-mentioned second adjustment mechanism is located on one side of the above-mentioned first support column in the above-mentioned left and right direction.

[0027] As a preferred technical solution for the above-mentioned test platform, the above-mentioned rear support member includes a second sliding seat, a second support tray and a second connector. The above-mentioned second sliding seat is slidably connected to the above-mentioned second platform, the above-mentioned second support tray is relatively fixed to the above-mentioned second sliding seat, the above-mentioned second connector and the above-mentioned second support tray are detachably arranged, and the rear suspension of the above-mentioned body in white is ball-hingedly connected to the above-mentioned second connector.

[0028] Beneficial effects of the present invention:

[0029] The present application provides a body-in-white static stiffness test method and test platform, the method comprising S10, adjusting the positional relationship between the supporting members according to the structural characteristics of the body-in-white; S20, installing the front suspension and the rear suspension of the body-in-white on the corresponding supporting members respectively; S30, adjusting the supporting members so that all the supporting members are only subjected to the vertical downward force applied by the body-in-white; S41, applying at least one preload F to the body-in-white 预 S42, applying a formal load F to the body in white, and the size of the formal load is applied step by step from low to high, and the data of the longitudinal beam of the body in white is collected step by step, satisfying F 预 <F; S43, calculate the static stiffness of the body-in-white according to the data. In this way, before the formal test, the internal stress of the body-in-white is eliminated by applying a preload, and the formal load is applied step by step, and the body-in-white data is collected step by step, and then the calculation is performed, so that the test result is more accurate.

[0030] The test platform is suitable for the above-mentioned test method, can adjust the support positions according to the structural characteristics of the body-in-white, and can assist in completing the bending test and torsion test of the body-in-white. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0032] Figure 1 is a schematic flow chart of a body-in-white static stiffness testing method provided by an embodiment of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the test platform provided by an embodiment of the present invention;

[0034] Figure 3 is a schematic structural diagram of a first bracket provided in an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of the structure of a first platform provided by an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of assembling the front support member and the first platform provided by an embodiment of the present invention;

[0037] Figure 6 is a schematic structural diagram of a front support assembly provided by an embodiment of the present invention;

[0038] Figure 7 is a schematic structural diagram of a front support member provided by an embodiment of the present invention;

[0039] Figure 8 is a structural schematic diagram of a rear support assembly provided by an embodiment of the present invention;

[0040] Fig. 9 It is a schematic structural diagram of a rear support member provided in an embodiment of the present invention.

[0041] In the figure:

[0042] X, front and back direction; Y, left and right direction; Z, vertical direction;

[0043] 100, base;

[0044] 200, front support assembly; 210, first bracket; 211, first adjustment mechanism; 2111, front suspension support seat; 2112, front suspension first locking ring; 2113, front suspension screw; 212, first platform; 2121, first table; 2122, front suspension Y-direction first fixing block; 2123, front suspension Y-direction second fixing block; 2124, front suspension Y-direction third fixing block; 2125, front suspension Y-direction screw; 2126, left front slider; 2127, right front slider; 2128 , second hand wheel; 220, front support; 221, first sliding seat; 222, first telescopic rod; 2221, front suspension second locking ring; 2222, front suspension second screw; 2223, third hand wheel; 223, first support tray; 224, first connector; 231, front suspension X-direction fixing member; 232, front suspension X-direction guide rail; 233, front suspension X-direction slider; 234, front suspension X-direction adjustment seat; 235, front suspension X-direction first screw; 236, first hand wheel; 24, bearing;

[0045] 300, rear support assembly; 310, second bracket; 311, second adjustment mechanism; 3111, loading electric cylinder; 3112, connecting ear; 3113, force sensor; 312, second platform; 313, first support column; 314, second support column; 320, rear support member; 321, second sliding seat; 322, second support tray; 323, second connector; 324, articulated ball head. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0050] like Figures 2 to 9 As shown, the present application provides a test platform, which includes a base 100, a front support assembly 200 and a rear support assembly 300. The front support assembly 200 includes a first bracket 210 and at least two front support members 220 arranged along the left-right direction Y, the first bracket 210 is slidably arranged on the base 100 along the front-back direction X and can be locked with the base 100, the front support members 220 are all slidably connected with the first bracket 210 along the left-right direction Y and can be locked with the first bracket 210, and the front support members 220 are used to install the front suspension of the white body; the rear support assembly 300 includes a second bracket 310 and at least two rear support members 320 arranged along the left-right direction Y, the second bracket 310 is installed on the base 100, the rear support members 320 are all slidably arranged on the second bracket 310 along the left-right direction Y and can be locked with the second bracket 310, and the rear support members 320 are used to install the rear suspension of the white body.

[0051] Specifically, the base 100 has a relatively large mass and can remain relatively still with the ground. The front support assembly 200 and the rear support assembly 300 are spaced apart on the base 100 in the front-to-back direction X. At least one of the front support assembly 200 and the rear support assembly 300 can slide relative to the base 100 along the front-to-back direction X, and the spacing between the two can be adjusted in the front-to-back direction X according to the structural characteristics of the body-in-white. In this embodiment, the front support assembly 200 can slide relative to the base 100, while the rear support assembly 300 is relatively fixed to the base 100.

[0052] It should be noted that the structural features of the body in white include its three-dimensional dimensions, namely length, width and height, and its contour shape.

[0053] like Figure 6 As shown, further, the front support assembly 200 also includes a front suspension X-direction fixing member 231, a front suspension X-direction guide rail 232, a front suspension X-direction slider 233, a front suspension X-direction adjustment seat 234 and a front suspension X-direction first screw 235. The front suspension X-direction fixing member 231 is fixedly mounted on the base 100; the front suspension X-direction guide rail 232 extends along the front-to-back direction X and is fixed on the front suspension X-direction fixing member 231; the first bracket 210 is slidably connected to the front suspension X-direction guide rail 232 through the front suspension X-direction slider 233; the front suspension X-direction adjustment seat 234 is fixedly connected to the front suspension X-direction fixing member 231; the front suspension X-direction first screw 235 passes through the front suspension X-direction adjustment seat 234 along the front-to-back direction X and is threadedly connected to the front suspension X-direction adjustment seat 234, and one axial end of the front suspension X-direction first screw 235 is rotatably connected to the first bracket 210 and the two are relatively fixed along the front-to-back direction X. Thus, by rotating the front suspension X-direction first screw rod 235 , the first bracket 210 can be driven to move along the front-rear direction X relative to the base 100 .

[0054] Furthermore, the front support assembly 200 further includes a first hand wheel 236, which is mounted on the front suspension X-direction first screw rod 235, and the first hand wheel 236 can drive the rotation of the front suspension X-direction first screw rod 235. In other embodiments, a motor drive may also be used.

[0055] The front support assembly 200 includes a first bracket 210 and at least two front support members 220. For example, in this embodiment, two front support members 220 are provided, which are respectively recorded as a left front support member and a right front support member. The two front support members 220 are both mounted on the first bracket 210, and the first bracket 210 can slide relative to the base 100 along the front-to-back direction X. In this way, when the position in the front-to-back direction X needs to be adjusted, only the first bracket 210 needs to be moved to change the position of the two front support members 220 in the front-to-back direction X. During the movement, the relative positions of the two front support members 220 in the front-to-back direction X and the left-to-right direction Y can always be kept fixed. At least one of the two front support members 220 can slide relative to the first bracket 210 along the left-to-right direction Y. In this embodiment, the two front support members 220 are both slidably connected to the first bracket 210, and are used to adjust the spacing in the left-to-right direction Y according to the structural characteristics of the body-in-white.

[0056] The rear support assembly 300 includes a second bracket 310 and at least two rear support members 320. Exemplarily, in this embodiment, two rear support members 320 are provided, which are respectively denoted as a left rear support member and a right rear support member. At least one of the two rear support members 320 can slide relative to the second bracket 310 along the left-right direction Y. In this embodiment, the two rear support members 320 are both slidably connected to the second bracket 310, and are used to adjust the spacing in the left-right direction Y according to the structural characteristics of the body in white.

[0057] Optionally, the first bracket 210 includes a first adjustment mechanism 211 and a first platform 212 , the first adjustment mechanism 211 connects the base 100 and the first platform 212 , and can adjust the height of the first platform 212 in the vertical direction Z, and the front support members 220 are slidably disposed on the first platform 212 .

[0058] like Figure 3 As shown, specifically, the first adjustment mechanism 211 includes a front suspension support seat 2111, a front suspension first locking ring 2112 and a front suspension screw 2113. The front suspension support seat 2111 is slidably disposed on the base 100, the front suspension screw 2113 is slidably inserted into the front suspension support seat 2111 through a spline structure along the vertical direction Z, the front suspension first locking ring 2112 is sleeved outside the front suspension screw 2113 and is threadedly connected, the front suspension first locking ring 2112 can abut against the port of the front suspension support seat 2111 along the vertical direction Z, and one axial end of the front suspension screw 2113 is fixed to the first platform 212. In this way, by screwing the front suspension first locking ring 2112, the axial position of the front suspension first locking ring 2112 on the front suspension screw 2113 is changed, thereby changing the insertion depth of the front suspension screw 2113 and the front suspension support seat 2111 to adjust the height of the first bracket 210 in the vertical direction Z.

[0059] In other embodiments, one end of the front suspension screw 2113 is threadedly connected to the front suspension support seat 2111 , and the other end is rotatably connected to the first bracket 210 , and the front suspension screw 2113 and the first bracket 210 are relatively fixed in the vertical direction Z.

[0060] like Figure 4As shown, specifically, the first platform 212 includes a first table 2121, a front suspension Y-direction first fixed block 2122, a front suspension Y-direction second fixed block 2123, a front suspension Y-direction third fixed block 2124, a front suspension Y-direction screw 2125, a left front slider 2126, and a right front slider 2127. The front suspension Y-direction first fixed block 2122, the front suspension Y-direction second fixed block 2123, and the front suspension Y-direction third fixed block 2124 are fixed to the first table 2121 in sequence along the left-right direction Y, and the front suspension Y-direction screw 2125 is rotatably connected to the three in sequence. On the left and right sides of the front suspension Y-direction second fixed block 2123, the threads of the front suspension Y-direction screw 2125 are arranged in opposite directions. The left front slider 2126 is threadedly connected to the front suspension Y-direction screw 2125 and is located at the front suspension Y-direction first fixed block. Between the fixed block 2122 and the second fixed block 2123 of the front suspension Y direction, the right front slider 2127 is threadedly connected to the front suspension Y direction screw 2125 and is located between the third fixed block 2124 of the front suspension Y direction and the second fixed block 2123 of the front suspension Y direction. By rotating the front suspension Y direction screw 2125, the left front slider 2126 and the right front slider 2127 can be moved closer to or away from each other. The left front slider 2126 is used to install the left front support member, and the right front slider 2127 is used to install the right front support member.

[0061] Furthermore, the first platform 212 further includes a second hand wheel 2128, which is connected to the front suspension Y-axis screw rod 2125 and is used to drive the front suspension Y-axis screw rod 2125 to rotate. In other embodiments, a motor drive is adopted.

[0062] like Figure 5 As shown, optionally, the front support member 220 includes a first sliding seat 221, a first telescopic rod 222 and a first support tray 223, the first sliding seat 221 can slide relative to the first platform 212, the first telescopic rod 222 connects the first support tray 223 and the first sliding seat 221 and can adjust the height of the first support tray 223 in the vertical direction Z.

[0063] Exemplarily, the first sliding seat 221 of the left front support member is fixed to the left front slider 2126, and the first sliding seat 221 of the right front support member is fixed to the right front slider 2127. The first telescopic rod 222 includes a front suspension second locking ring 2221, a front suspension second screw rod 2222 and a third hand wheel 2223. The front suspension second screw rod 2222 is inserted into the first sliding seat 221 along the vertical direction Z, the third hand wheel 2223 is rotatably connected to the first sliding seat 221 and forms a worm gear structure with the front suspension second screw rod 2222, and the front suspension second screw rod 2222 can be moved along the vertical direction Z by rotating the third hand wheel 2223. The top of the front suspension second screw rod 2222 is installed with a first support tray 223, and the front suspension second locking ring 2221 is sleeved outside the front suspension second screw rod 2222 and is threadedly connected thereto, and can abut against the first sliding seat 221 along the vertical direction Z.

[0064] like Figure 7 As shown, optionally, the front support member 220 further includes a first connector 224 , the first connector 224 is detachably connected to the first support tray 223 , and the front suspension of the body-in-white is connected to the first connector 224 via a bearing 24 .

[0065] Specifically, a mounting hole is provided at the top end of the first connector 224 along the left-right direction Y, and the bearing 24 is installed in the mounting hole. The outer ring of the bearing 24 is relatively fixed to the first connector 224, and the front suspension of the body-in-white is fixed to the inner ring of the bearing 24. In this way, the freedom of the front suspension of the body-in-white in the front-to-back direction X, the left-to-right direction Y, and the vertical direction Z, the rotation direction around the front-to-back direction X, and the rotation direction around the vertical direction Z is limited, so that the front suspension of the body-in-white can only rotate around an axis parallel to the left-to-right direction Y.

[0066] like Figure 8 As shown, optionally, the second bracket 310 includes a second adjusting mechanism 311 and a second platform 312, one end of the second adjusting mechanism 311 is connected to the base 100, and the other end is hinged to the second platform 312, and the second adjusting mechanism 311 can adjust the height of the second platform 312 in the vertical direction Z, and can change the height difference between the two ends of the second platform 312 in the left and right direction Y.

[0067] Exemplarily, in this embodiment, two second adjusting mechanisms 311 are provided, which are spaced apart in the left-right direction Y. When the two second adjusting mechanisms 311 move in the same direction in the vertical direction Z at the same time, the height of the second platform 312 in the vertical direction Z can be changed. When the two second adjusting mechanisms 311 move in opposite directions in the vertical direction Z, the second platform 312 can be tilted, thereby applying torque to the rear suspension of the body-in-white.

[0068] In this embodiment, the second adjustment mechanism 311 includes a loading electric cylinder 3111 , a fixed portion of the loading electric cylinder 3111 is installed on the base 100 , and a telescopic portion of the loading electric cylinder 3111 is hinged to the second platform 312 .

[0069] Specifically, the second adjustment mechanism 311 further includes a connecting ear 3112 , the connecting ear 3112 is fixed to the second platform 312 , and the telescopic end of the loading electric cylinder 3111 is hinged to the second platform 312 through the connecting ear 3112 .

[0070] Furthermore, the second adjustment mechanism 311 also includes a force sensor 3113, which is used to obtain the force condition of the loading electric cylinder 3111. Generally, if it is operating normally, the feedback value of the force sensor shows a smooth and gradually rising trend. When its trend fluctuates, it is determined that the structure of the second adjustment mechanism 311 is damaged, an alarm is triggered, and the test is stopped.

[0071] Optionally, the second bracket 310 also includes a first support column 313, one end of the first support column 313 is connected to the base 100, and the other end is hinged to the second platform 312, the first support column 313 can be extended or locked along the vertical direction Z, and the second adjustment mechanism 311 is located on one side of the first support column 313 in the left and right direction Y.

[0072] Exemplarily, in this embodiment, two second adjustment mechanisms 311 are provided, respectively located on the left and right sides of the first support column 313, and the second platform 312 is mainly supported by the first support column 313. The two second adjustment mechanisms 311 can form a lever model with the second platform 312 with the first support column 313 as the fulcrum.

[0073] Furthermore, the second bracket 310 also includes a second support column 314, the two ends of which are respectively connected to the base 100 and the second platform 312, for assisting the first support column 313 in supporting the second platform 312, and the second support column 314 is located on one side of the first support column 313 in the left-right direction Y, and the second support column 314 can be extended and locked in the vertical direction Z. During the debugging process before the test, when the second platform 312 needs to move in the vertical direction Z, the second adjustment mechanism 311 is used as an active part to drive the second platform 312 to move in the vertical direction Z, and the first support column 313 and the second support column 314 are both followers, which are extended and retracted in the vertical direction Z driven by the second platform 312. After the debugging is completed, if the torsion test of the body in white is performed, The first support column 313 is locked in length in the vertical direction Z, and the second support column 314 is still in a follow-up state. The first support column 313 and the second platform 312 form a lever model. The second adjustment mechanism 311 applies a force on one side of the first support column 313, so that the second platform 312 can swing around an axis parallel to the front-rear direction X with the first support column 313 as a fulcrum; if a bending and torsion test of the body-in-white is performed, the first support column 313 and the second support column 314 are both locked in height in the vertical direction Z to support the second platform 312, and the second support column 314 can limit the rotation of the second platform 312 relative to the first support column 313. At this time, the second adjustment mechanism 311 is in standby mode and no longer actively changes the force applied to the second platform 312.

[0074] Optionally, the rear support member 320 includes a second sliding seat 321, a second support tray 322 and a second connector 323, the second sliding seat 321 is slidably connected to the second platform 312, the second support tray 322 is relatively fixed to the second sliding seat 321, the second connector 323 and the second support tray 322 are detachably arranged, and the rear suspension of the body in white is ball-hingedly connected to the second connector 323.

[0075] Specifically, the detachable design of the second connector 323 and the second support tray 322 allows the second connector 323 to be replaced according to the structural characteristics of the body-in-white. The second connector 323 has a mounting hole along the left-right direction Y, and the articulated ball head 324 is installed in the mounting hole, and the rear suspension of the body-in-white is fixed to the articulated ball head 324.

[0076] like Figure 1 As shown, the present invention provides a body-in-white static stiffness testing method, comprising:

[0077] S10, adjusting the positional relationship between the supporting parts according to the structural characteristics of the body in white;

[0078] S20, installing the front suspension and the rear suspension of the body-in-white on corresponding support members respectively;

[0079] S30, adjusting the support members so that all the support members are only subjected to the vertical downward force exerted by the body-in-white;

[0080] S41. Apply at least one preload F to the body in white 预 ;

[0081] S42, apply a formal load F to the body in white, and the size of the formal load is applied step by step from low to high, and collect data of the longitudinal beam of the body in white step by step, satisfying F 预 <F;

[0082] S43. Calculate the static stiffness of the body in white based on the data.

[0083] In combination with the test platform provided by the present invention, the specific execution steps of the above-mentioned body-in-white static stiffness test method are as follows:

[0084] S0, determining whether the first platform 212 and the second platform 312 are both in a horizontal state, if so, executing S10; if not, adjusting the first platform 212 and / or the second platform 312 in a non-horizontal state to a horizontal state;

[0085] In this embodiment, the horizontal state of the first platform 212 and / or the second platform 312 is obtained by a level ruler, and the first platform 212 and / or the second platform 312 is adjusted to be horizontal by changing the first adjustment mechanism 211 and / or the second adjustment mechanism 311 .

[0086] S10, adjusting the positional relationship between the supporting parts according to the structural characteristics of the body in white;

[0087] In this embodiment, the structural features of the body-in-white including its outline shape, length, width, height and other dimensions are measured, the front support assembly 200 and the rear support assembly 300 are adjusted in the front-to-back direction X to adjust the relative position, and the two front support members 220 and the two rear support members 320 are adjusted in the left-right direction Y to adjust the relative position. The first adjustment mechanism 211 and the second adjustment mechanism 311 can change the height in the vertical direction Z.

[0088] S20, installing the front suspension and the rear suspension of the body-in-white on corresponding support members respectively;

[0089] S30, adjusting the support members so that all the support members are only subjected to the vertical downward force exerted by the body-in-white;

[0090] This is used to eliminate the internal stress generated in the body in white during the installation process.

[0091] After completing the above preparations, the body-in-white needs to be tested for static stiffness. Generally, static stiffness tests are divided into torsional stiffness tests and bending stiffness tests. The following introduces the two tests separately:

[0092] When testing torsional stiffness:

[0093] S41, applying a first preload F to the body-in-white at least once in the clockwise direction and counterclockwise direction respectively 预1 ;

[0094] In this embodiment, the first preload is applied to the body in white three times in the clockwise and counterclockwise directions respectively. The torque value generated by the first preload is half of the maximum torque value of the test, which is used to eliminate the influence of the connection gap between the body in white and the fixture, the sinking of the body in white, etc. on the measurement results.

[0095] S42, apply a first load F1 to the rear suspension of the body-in-white in clockwise and counterclockwise directions respectively, and the magnitude of the first load is applied step by step from low to high, and collect the deformation value of the longitudinal beam of the body-in-white step by step, satisfying F 预1 <F1;

[0096] In this embodiment, torque is applied step by step at the rear suspension of the body in white, and the deformation values ​​of each point of the longitudinal beam are collected once at each level. There are at least four levels of loading until the maximum torque is specified, and the process is completed three times each in clockwise and counterclockwise directions.

[0097] S43, calculating the torsion angle and torsion stiffness according to the deformation value obtained in S42;

[0098] Calculate the torsional stiffness of the body-in-white / cab using the following formula:

[0099]

[0100] Δθ=θ r -θ f

[0101]

[0102] Where:

[0103] θ—torsion angle;

[0104] θ r —Rear suspension torsion angle;

[0105] θ f —Front suspension torsion angle;

[0106] Δθ—relative torsion angle;

[0107] K t — torsional stiffness;

[0108] M—applied torque;

[0109] d fl d fr —Absolute value of deformation of left and right sensors of front suspension;

[0110] d rl d rr —Absolute value of deformation of left and right sensors of rear suspension;

[0111] Y f , Y r —The distance between the left and right sensors of the front and rear suspensions.

[0112] The torsion angle correction value obtained relative to the front suspension, namely the relative torsion angle, is used to calculate the torsional stiffness, which can eliminate the systematic error caused by the deformation of the test bench.

[0113] When performing bending stiffness testing:

[0114] S41, applying a second preload F to the cab position of the body-in-white 预2 , the second preload is perpendicular to the body in white;

[0115] In this embodiment, a second preload perpendicular to the BIW is applied to the cab of the BIW three times, and the value of the second preload is half of the maximum load to eliminate the influence of the gap between the BIW and the fixture, the sinking of the BIW, etc. on the test results.

[0116] S42, applying a second load F2 multiple times to the seat fixing position of the body-in-white, the second load is perpendicular to the body-in-white, the magnitude of the multiple second loads is applied step by step from low to high, and the deflection of the longitudinal beam of the body-in-white is collected step by step, satisfying: F 预2 <F2;

[0117] In this embodiment, a second load F2 is applied to the seat fixing point of the body in white, and the deflection of the longitudinal beam on one side is collected at each level. It is best to load at 4 levels until the maximum load is specified.

[0118] S53. Calculate the bending stiffness based on the deflection.

[0119] Calculate the torsional stiffness of the body-in-white / cab using the following formula:

[0120] K b =F / Δδ

[0121] Δδ=δ-δ f

[0122] Where:

[0123] K b - flexural rigidity;

[0124] F-bending load;

[0125] Δδ-relative deflection;

[0126] δ f- Deflection of the front suspension fixing point;

[0127] δ-maximum deflection.

[0128] The relative deflection, the correction value of the deflection obtained relative to the front suspension, is used to calculate the bending stiffness, which can eliminate the systematic error caused by the deformation of the test bench.

[0129] Optionally, the support member limits the freedom of movement of the rear suspension of the body-in-white in the front-rear direction X. In this way, the accuracy of the test can be increased.

[0130] Optionally, the support member limits the front suspension of the body-in-white to move in the front-rear direction X, the left-right direction Y, the vertical direction Z, the rotation direction around the front-rear direction X, and the rotation direction around the vertical direction Z. In this way, the accuracy of the test can be increased.

[0131] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Body-in-white static stiffness test method, characterized in that: include: S10, adjusting the positional relationship between the supporting parts according to the structural characteristics of the body in white; S20, installing the front suspension and the rear suspension of the body-in-white on the corresponding support members respectively; S30, adjusting the support members so that all the support members are only subjected to the vertical downward force exerted by the body-in-white; S41, applying a preload F to the body-in-white at least once 预 ; S42, applying a formal load F to the body-in-white, and the magnitude of the formal load is applied step by step from low to high, and collecting data of the longitudinal beams of the body-in-white step by step, satisfying F 预 <F; S43. Calculate the static stiffness of the body-in-white according to the data.

2. The body-in-white static stiffness testing method according to claim 1, characterized in that: The support member limits the freedom of movement of the rear suspension of the body-in-white in the front-rear direction (X).

3. The body-in-white static stiffness testing method according to claim 2, characterized in that: The support member limits the freedom of movement of the front suspension of the body in the front-rear direction (X), the left-right direction (Y), the vertical direction (Z), the rotation direction around the front-rear direction (X) and the rotation direction around the vertical direction (Z).

4. A test platform, suitable for the body-in-white static stiffness test method according to any one of claims 1 to 3, characterized in that: The test platform includes: Base (100); A front support assembly (200), the front support assembly (200) comprising a first bracket (210) and at least two front support members (220) arranged along a left-right direction (Y), the first bracket (210) being slidably arranged on the base (100) along a front-back direction (X) and being capable of being locked with the base (100), the front support members (220) being slidably connected to the first bracket (210) along the left-right direction (Y) and being capable of being locked with the first bracket (210), and the front support members (220) being used for installing a front suspension of a body-in-white; A rear support assembly (300), the rear support assembly (300) comprising a second bracket (310) and at least two rear support members (320) arranged along the left-right direction (Y), the second bracket (310) being mounted on the base (100), the rear support members (320) being slidably arranged on the second bracket (310) along the left-right direction (Y) and being capable of being locked with the second bracket (310), the rear support members (320) being used for mounting the rear suspension of the body-in-white.

5. The test platform according to claim 4, characterized in that: The first bracket (210) comprises a first adjustment mechanism (211) and a first platform (212); the first adjustment mechanism (211) connects the base (100) and the first platform (212) and is capable of adjusting the height of the first platform (212) in a vertical direction (Z); and the front support members (220) are slidably disposed on the first platform (212).

6. The test platform according to claim 5, characterized in that: The front support member (220) comprises a first sliding seat (221), a first telescopic rod (222) and a first support tray (223); the first sliding seat (221) is capable of sliding relative to the first platform (212); the first telescopic rod (222) connects the first support tray (223) and the first sliding seat (221) and is capable of adjusting the height of the first support tray (223) in the vertical direction (Z).

7. The test platform according to claim 6, characterized in that: The front support member (220) further comprises a first connector (224), the first connector (224) being detachably connected to the first support tray (223), and the front suspension of the body-in-white is connected to the first connector (224) via a bearing (24).

8. The test platform according to claim 4, characterized in that: The second bracket (310) includes a second adjusting mechanism (311) and a second platform (312), one end of the second adjusting mechanism (311) is connected to the base (100), and the other end is hinged to the second platform (312), and the second adjusting mechanism (311) can adjust the height of the second platform (312) in the vertical direction (Z), and can also change the height difference between the two ends of the second platform (312) in the left-right direction (Y).

9. The test platform according to claim 8, characterized in that: The second adjustment mechanism (311) comprises a loading electric cylinder (3111), a fixed portion of the loading electric cylinder (3111) is mounted on the base (100), and a telescopic portion of the loading electric cylinder (3111) is hinged to the second platform (312).

10. The test platform according to claim 9, characterized in that: The second adjustment mechanism (311) further comprises a force sensor (3113), and the force sensor (311) is used to obtain the force condition of the loading electric cylinder (3111).

11. The test platform according to claim 9, characterized in that: The second bracket (310) also includes a first support column (313), one end of the first support column (313) is connected to the base (100), and the other end is hinged to the second platform (312), the first support column (313) can be extended or locked along the vertical direction (Z), and the second adjustment mechanism (311) is located on one side of the first support column (313) in the left-right direction (Y).

12. The test platform according to claim 8, characterized in that: The rear support member (320) includes a second sliding seat (321), a second support tray (322) and a second connector (323); the second sliding seat (321) is slidably connected to the second platform (312); the second support tray (322) and the second sliding seat (321) are relatively fixed; the second connector (323) and the second support tray (322) are detachably arranged; and the rear suspension of the body-in-white is ball-hingedly connected to the second connector (323).

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