A test tool and method for testing the slip and residual torque of a toothed body sleeve

Abstract

The present application relates to the technical field of automobile parts testing, and discloses a test tool and method for the sliding amount and residual torque of a toothed body sleeve, comprising a fixing tool, test bolts, nuts, a large-head flange electrophoresis plate, a positioning clamp block assembly and a ballast pad, wherein, in a test state, the large-head flange electrophoresis plate is installed on the fixing tool, the positioning area in the positioning clamp block assembly is used to position the installation position of the body sleeve, the test bolts and the positioning clamp block assembly together ensure concentricity, and the test bolts can be self-centered to compensate without deflection, the test result is high in accuracy, the test bolts are installed, the test bolts are combined with the nuts, and the ballast pad is used to apply pressure to the body sleeve according to the set parameters.

Description

Technical Field

[0001] This invention relates to the field of automotive component testing technology, specifically to a tooling and method for testing the slippage and residual torque of a toothed body sleeve. Background Technology

[0002] The bonding strength between the sleeve and the chassis sheet metal of an automotive chassis needs to be simulated after welding. Therefore, it is necessary to test the sleeve's slippage and residual torque. In existing technologies, because the actual tooth surface shape of the chassis sleeve is difficult to measure, specialized testing equipment is typically used. However, this equipment is expensive, complex to operate, and requires the fabrication of various flange clamping tools, resulting in poor versatility. Furthermore, traditional methods using curved surfaces for clamping result in misalignment and poor concentricity due to tolerance gaps and the inability to self-center.

[0003] Therefore, traditional testing methods have many problems, such as high cost, complex operation, low versatility, and poor concentricity. There is an urgent need for a testing fixture and method that is simple to operate, low in manufacturing cost, requires minimal testing equipment, is widely applicable, and has good concentricity, in order to solve the problems existing in the current technology and accurately test the slippage and residual torque of toothed body sleeves in automotive chassis components. Summary of the Invention

[0004] The purpose of this invention is to provide a testing fixture and method for the slippage and residual torque of toothed body sleeves, which is used to test the slippage and residual torque of toothed body sleeves of automotive chassis components. It has the characteristics of simple operation, low manufacturing cost, and low requirements for testing equipment, and solves the problems of poor versatility and concentricity in traditional testing equipment.

[0005] This invention is achieved through the following technical solution.

[0006] This invention discloses a testing fixture for the slippage and residual torque of a toothed vehicle body sleeve, comprising: a fixing fixture, a test bolt, a nut, a large-end flange electrophoretic plate, a positioning clamp assembly, and a ballast pad. The large-end flange electrophoretic plate can be mounted on the fixing fixture for contacting the toothed end of the vehicle body sleeve, realistically simulating the frictional force of the chassis frame sheet metal. The positioning clamp assembly has a positioning area. The test bolt passes through the vehicle body sleeve and connects to the nut. The nut is mounted on the fixing fixture. The ballast pad is used to contact the vehicle body sleeve. Under test conditions: the large-end flange... The electrophoresis plate is installed on a fixed fixture. The positioning area in the positioning clamping block assembly is used to position the installation position of the body sleeve, making the body sleeve coaxial with the nut and test bolt. The test bolt and the positioning clamping block assembly together ensure concentricity, which can self-center and compensate without deviation, resulting in high test accuracy. The test bolt is installed so that it engages with the nut, and the ballast pad is used to apply pressure to the body sleeve according to the set parameters. This test fixture has a simplified structure and low cost. The assembly work before testing is simple and only requires the use of a universal electronic testing machine to complete the test, with low requirements for testing equipment.

[0007] Furthermore, the toothed body sleeve slippage and residual torque testing fixture also includes a small-head electrophoresis plate, which is used to install between the test bolt head and the body sleeve to further simulate the state of the chassis sheet metal.

[0008] Furthermore, a pad is provided between the large-end flange electrophoresis plate and the fixed fixture. The pad is preferably a steel pad. The steel pad is used to protect the end face teeth of the fixed fixture from being crushed when the test bolt is tightened on the body sleeve and to support the large-end flange electrophoresis plate. A flat washer is provided between the small-end electrophoresis plate and the head of the test bolt. The flat washer also serves to prevent crushing.

[0009] Furthermore, the large-head flange electrophoresis plate and the gasket are fixed by bolt assemblies, and the fixing fixture is provided with bolt holes. Preferably, two sets of bolt assemblies are provided.

[0010] Furthermore, the fixing fixture is provided with a nut locking assembly, which is used to lock the nut. During testing, it needs to be locked to a set force value. The nut locking assembly is preferably made of bolt.

[0011] Furthermore, an adjustable contact body is movably mounted on the ballast pad, the adjustable contact body being used to contact the vehicle body sleeve.

[0012] Preferably, the adjustable contact body is a bolt, which is rotated to make it contact the vehicle body sleeve.

[0013] Preferably, the positioning clamping block assembly includes two sets of clamping blocks, each of which is provided with a dovetail groove. After the two sets of clamping blocks are assembled, a positioning area is formed at the dovetail groove. The dovetail groove can clamp flanges and cylindrical surfaces of various specifications, making it widely applicable and eliminating the need to manufacture various clamping fixtures of different specifications, thus having wide versatility.

[0014] A method for testing the slippage and residual torque of a toothed body sleeve, the method being based on the aforementioned testing fixture for the slippage and residual torque of a toothed body sleeve, includes the following steps:

[0015] Assembly steps:

[0016] Install the large-head flange electrophoresis plate onto the fixed fixture;

[0017] Install the positioning clamping block assembly onto the fixing fixture;

[0018] Place the toothed end of the body sleeve flange in the positioning area of ​​the positioning clamping block assembly;

[0019] The nut is tightened using a nut locking assembly until it reaches the set force value;

[0020] Install the test bolt and engage it with the nut. Tighten the test bolt to the set torque value and record it as the initial torque.

[0021] Slip test procedure:

[0022] Record the first relative position parameters between the toothed end of the body sleeve flange and the electrophoresis plate of the large end flange;

[0023] Pressure is applied to the vehicle body sleeve according to set parameters using ballast pads;

[0024] After the test is completed, record the second relative position parameters between the toothed end of the body sleeve flange and the electrophoresis plate of the large end flange. The distance between the two positions of the toothed end of the body sleeve flange is the slippage amount.

[0025] Loosen the test bolt and record the loosening value as residual torque.

[0026] Furthermore, in the slip test step, pressure is applied to the ballast pad using a universal electronic testing machine, and the pressure curve is recorded during the test. If the force value decreases before the set target pressure value is reached, the pressure is stopped and the ballast force value is recorded. If the pressure value does not decrease, the load is increased to the set pressure value.

[0027] Furthermore, in the assembly step, a pad is installed between the large-end flange electrophoresis plate and the fixed fixture, and a small-end electrophoresis plate and a flat washer are installed between the test bolt head and the body sleeve; in the slip test step, the relative position of the body sleeve flange tooth end and the large-end flange electrophoresis plate is recorded by an engraving method.

[0028] The beneficial effects of this invention are as follows: The testing fixture in this solution is simple to operate, has low manufacturing cost, and requires minimal testing equipment, effectively reducing testing costs and improving testing efficiency; the positioning area in the positioning clamp assembly is used to locate the installation position of the vehicle body sleeve, and the test bolt and the positioning clamp assembly together ensure concentricity, enabling self-centering compensation without deviation, resulting in high test accuracy; during testing, only common torque wrenches and universal electronic testing machines are needed, eliminating the need for specialized testing equipment and reducing testing equipment costs; the pressure curve can be observed in real time during testing, and the test can be manually stopped based on curve changes, improving test controllability and safety; it can also accurately measure and record key parameters such as initial torque, residual torque, slippage, test curve, and ballast force value, providing a basis for subsequent data analysis and optimization.

[0029] This solution is highly versatile. By using a positioning clamping block assembly with dovetail grooves, it can clamp flanges and cylindrical surfaces of various specifications, making it widely applicable and eliminating the need to manufacture multiple clamping fixtures of different specifications. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 A schematic diagram of the overall structure of the tooling for testing the slippage and residual torque of the toothed body sleeve;

[0033] Figure 2 Another perspective structural schematic diagram of the tooling for testing the slippage and residual torque of the toothed body sleeve;

[0034] Figure 3 A cross-sectional view of the tooling for testing the slippage and residual torque of the toothed body sleeve;

[0035] Figure 4 An exploded view of the tooling for testing the slippage and residual torque of the toothed body sleeve. Detailed Implementation

[0036] The following is combined with Figures 1-4 The present invention will be described in detail below.

[0037] The present invention provides a tooling for testing the slippage and residual torque of a toothed body sleeve, comprising: a fixing tooling 1, a test bolt 2, a nut 10, a large-end flange electrophoresis plate 7, a pad 8, a flat gasket 3, a small-end electrophoresis plate 4, a positioning clamping block assembly, and a ballast pad 11.

[0038] The fixed fixture 1 is provided with two sets of bolt holes 14 for installing bolt assembly 13, one through hole 15 for installing nut 10, and one bolt hole for installing locking bolt 9 of nut locking assembly.

[0039] The large-end flange electrophoresis plate 7 can be installed on the fixed fixture 1 to contact the toothed end of the body sleeve, realistically simulating the friction of the chassis frame sheet metal. A pad 8 is provided between the large-end flange electrophoresis plate 7 and the fixed fixture 1. The pad 8 is preferably a steel pad. The steel pad is used to protect the toothed end face of the bottom of the fixed fixture from being crushed when the test bolt 2 is tightened on the body sleeve, and to support the large-end flange electrophoresis plate 7. The large-end flange electrophoresis plate 7 and the pad 8 are fixed by bolt assembly 13. The bolt assembly 13 mates with bolt holes 14. Two sets of bolt assemblies 13 are provided. Bolt holes are provided on both the large-end flange electrophoresis plate 7 and the pad 8.

[0040] The positioning clamping block assembly includes two sets of clamping blocks, namely clamping block 5 and clamping block 6. Each clamping block is provided with a dovetail groove. After the two sets of clamping blocks are assembled, a positioning area 17 is formed at the dovetail groove. The dovetail groove can clamp flanges and cylindrical surfaces of various specifications, with a wide range of applications. It eliminates the need to manufacture multiple clamping fixtures of different specifications and has wide versatility.

[0041] Test bolt 2 is used to pass through the body sleeve and connect to nut 10. After test bolt 2 and nut cooperate to fix body sleeve 16, it is used to simulate body sleeve 16 being welded to the sheet metal base plate of automobile chassis, so as to obtain accurate measurement results. A flat washer 3 and a small-end electrophoresis plate 4 are provided between the small-end electrophoresis plate 4 and the head of test bolt 2. The small-end electrophoresis plate 4 is used to further simulate the state of chassis sheet metal. The flat washer 3 also serves to avoid crushing. Nut 10 is installed in through hole 15 of fixing fixture 1. Nut locking assembly includes locking bolt 9. Locking bolt 9 is used to lock nut 10. During testing, it needs to be locked to the set force value.

[0042] Ballast pad 11 is used to contact the vehicle body sleeve. An adjustable contact body 12 is movably installed on ballast pad 11. The adjustable contact body 12 is used to contact the vehicle body sleeve. In this embodiment, the adjustable contact body 12 is a bolt.

[0043] In the test state: The large-head flange electrophoresis plate 7 is installed on the fixed fixture 1. The positioning area 17 in the positioning clamping block assembly is used to position the installation position of the body sleeve, so that the body sleeve, nut 10 and test bolt 2 are coaxial. The test bolt 2 and the positioning clamping block assembly together ensure concentricity. It can self-center and compensate without deflection, resulting in high test accuracy. The test bolt 2 is installed so that it is engaged with the nut 10. The ballast pad 11 is used to apply pressure to the body sleeve according to the set parameters. This test fixture has a simplified structure and low cost. The assembly work before the test is simple. It only needs to be used with a universal electronic testing machine to complete the test, and the requirements for the testing equipment are low.

[0044] A method for testing the slippage and residual torque of a toothed body sleeve, the method being based on the aforementioned testing fixture for the slippage and residual torque of a toothed body sleeve, includes the following steps:

[0045] Step 1: Prepare the test conditions, including the sliding fixture and its components, torque wrench, universal electronic testing machine, standard bolts and nuts;

[0046] Step 2: Assemble the test fixture, including the following steps:

[0047] Step 201: Install nut 10 into sliding fixing fixture 1, and screw in locking bolt 9 from the side surface to tighten to 200Nm±10Nm;

[0048] Step 202: According to the tooling positioning holes, i.e. bolt holes, fit the steel pad 8 to protect the bottom of the tooling from being crushed by the end face teeth when the bolts are tightened on the body sleeve 16, and also to protect the large flange electrophoretic plate 7. Then fit the large flange electrophoretic plate 7 onto the steel pad 8. The large flange electrophoretic plate 7 realistically simulates the friction of the chassis frame sheet metal and the engraved markings can better distinguish the amount of change. Use the bolt assembly 13 to fix the large flange electrophoretic plate 7 and the steel pad 8, with a locking torque of 140Nm~160Nm.

[0049] Step 203: Install the positioning clamping block assembly into the fixing fixture 1. The two sides of the clamping block should be parallel and aligned with the two ends of the fixing fixture 1, and should not be offset to one side.

[0050] Step 204: Place the flange toothed end 161 of the body sleeve 16 into the clamp, and tighten and fix the body sleeve 16 using the test bolt 2 and nut 10. Screw in the test bolt and tighten the test bolt 2 to 140Nm±10Nm. Then turn the angle 120 degrees±3 degrees and record the final tightening torque value as the initial torque. At this time, the flange toothed end 161 of the body sleeve 16 will be pressed into the large-head flange electrophoresis plate 7 to a certain depth. The teeth can be seen after the body sleeve is removed.

[0051] In other embodiments, the test bolt 2 can be tightened to 138Nm~142Nm, and then rotated by an angle of 117 degrees~123 degrees.

[0052] Step 3: Conduct a slip test, including the following steps:

[0053] Step 301: Unload the positioning clamping block assembly and use a carving knife to make the first marking on the position of the flange tooth end 161 of the body sleeve 16 on the large flange electrophoresis plate 7.

[0054] Step 302: Adjust the hex bolts inside the ballast pad block to fit against the outer circle of the flange of the body sleeve 16;

[0055] Step 303: Replace the universal electronic testing machine fixture and fix the sliding fixture pad in place;

[0056] Step 304: Install the ballast pad and sleeve, and lower the test machine head until it is in contact with the pad;

[0057] Step 305: Open the universal electronic testing machine compression software, set the program control mode, and set the position speed to 3mm / min±0.1mm / min and the reaching force value to 60KN±0.1KN;

[0058] In other embodiments, the position speed can be optionally set to 2.8 mm / min to 3.2 mm / min, and the force value can be set to 59 KN to 61 KN.

[0059] Step 306: After clicking "Software Reset", run the test. During the test, observe the pressure curve. If the force value drops before reaching the set target value of 60KN, you need to manually click "Stop". If there is no slippage when the force value exceeds 35KN, it is considered qualified; otherwise, it is unqualified. If the pressure value does not drop, load to the set value of 60KN.

[0060] Step 307: After the test is completed, the sleeve will slide downwards. Use a scriber to make a second scribe mark at the sleeve flange and the electrophoresis plate. Measure the amount of slippage using the offset of the two scribe marks.

[0061] Step 4: Measure and record the data, including the following steps:

[0062] Step 401: Move the fixture 1 to the bench vise for fixing, loosen the test bolt 2, and record the loosening value as the residual torque;

[0063] Step 402: Mark the disassembled large flange electrophoresis plate 7, and use a microscope with 50X±5X to test the two scribing lines. The distance from the first scribing line to the second scribing line is the slippage amount after the test.

[0064] Step 403: Record and save the test curve and the final force value. The information to be recorded after summarizing includes the initial torque, residual torque, slip, test curve and ballast force value.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A tooling for testing the slippage and residual torque of a toothed car body sleeve, characterized in that: include: The fixture includes a fixed fixture (1), a test bolt (2), a nut (10), a large-end flange electrophoresis plate (7), a positioning clamping block assembly, and a ballast pad (11). The large-end flange electrophoresis plate (7) can be installed on the fixed fixture (1) to contact the toothed end of the body sleeve, realistically simulating the friction of the chassis frame sheet metal. The positioning clamping block assembly has a positioning area (17). The test bolt (2) is used to pass through the body sleeve and connect with the nut (10). The nut (10) is installed on the fixed fixture (1). The ballast pad (11) is used to contact the body sleeve. Under test conditions: the large-end flange electrophoresis plate (7) is installed on the fixed fixture (1), and the positioning area (17) in the positioning clamping block assembly is used to position the body sleeve. The installation position is such that the body sleeve is coaxial with the nut (10) and the test bolt (2). The test bolt (2) is installed so that it is engaged with the nut (10). The test bolt (2) is tightened to the set torque value and recorded as the initial torque. The ballast pad (11) is used to apply pressure to the body sleeve according to the set parameters. The first relative position parameters of the body sleeve flange tooth end and the large-end flange electrophoresis plate (7) are recorded. The ballast pad (11) is used to apply pressure to the body sleeve according to the set parameters. After the test is completed, the second relative position parameters of the body sleeve flange tooth end and the large-end flange electrophoresis plate (7) are recorded. The distance between the two positions of the body sleeve flange tooth end is the slippage. The test bolt (2) is loosened and the loosening value is recorded as the residual torque. The fixed fixture (1) is provided with a nut locking assembly, which is used to lock the nut (10); the positioning clamping block assembly includes two sets of clamping blocks, each of which is provided with a dovetail groove. After the two sets of clamping blocks are assembled, a positioning area (17) is formed at the dovetail groove; an adjustable contact body (12) is movably installed on the ballast pad (11), which is used to contact the body sleeve; the positioning area (17) in the positioning clamping block assembly is used to position the installation position of the body sleeve, so that the body sleeve is coaxial with the nut (10) and the test bolt (2). The test bolt (2) and the positioning clamping block assembly together ensure concentricity and can self-center without deviation.

2. The tooling for testing the slippage and residual torque of the toothed body sleeve according to claim 1, characterized in that: The toothed body sleeve slippage and residual torque test fixture also includes a small-head electrophoresis plate (4), which is used to install between the head end of the test bolt (2) and the body sleeve.

3. The tooling for testing the slippage and residual torque of the toothed body sleeve according to claim 2, characterized in that: A pad (8) is provided between the large-end flange electrophoresis plate (7) and the fixed fixture (1), and a flat washer (3) is provided between the small-end electrophoresis plate (4) and the head of the test bolt (2).

4. The tooling for testing the slippage and residual torque of the toothed body sleeve according to any one of claims 1-3, characterized in that: The large-head flange electrophoresis plate (7) is fixed by bolt assembly (13), and the fixing fixture (1) is provided with bolt holes (14).

5. A method for testing the slippage and residual torque of a toothed body sleeve, wherein the method is based on the testing fixture for the slippage and residual torque of a toothed body sleeve as described in any one of claims 1-4, characterized in that: Includes the following steps: Assembly steps: Install the large-head flange electrophoresis plate (7) on the fixed fixture (1); Install the positioning clamping block assembly onto the fixing fixture (1); Place the toothed end of the body sleeve flange in the positioning area (17) of the positioning clamping block assembly. Install the test bolt (2) and engage it with the nut (10). Tighten the test bolt (2) to the set torque value and record it as the initial torque. Slip test procedure: Record the first relative position parameters between the toothed end of the body sleeve flange and the electrophoresis plate (7) of the large-end flange; Pressure is applied to the vehicle body sleeve according to the set parameters using ballast pads (11); After the test is completed, record the second relative position parameters between the toothed end of the body sleeve flange and the electrophoretic plate (7) of the large end flange. The distance between the two positions of the toothed end of the body sleeve flange is the slippage amount. Loosen the test bolt (2) and record the loosening value as the residual torque.

6. The method for testing the slippage and residual torque of the toothed body sleeve according to claim 5, characterized in that: In the slip test step, pressure is applied to the ballast pad (11) using a universal electronic testing machine, and the pressure curve is recorded during the test. If the force value drops before the set target pressure value is reached, the pressure is stopped and the ballast force value is recorded. If the pressure force value does not drop, the load is applied to the set pressure value.

7. The method for testing the slippage and residual torque of the toothed body sleeve according to claim 5 or 6, characterized in that: In the assembly step, a pad (8) is assembled between the large-end flange electrophoresis plate (7) and the fixed fixture (1), and a small-end electrophoresis plate (4) and a flat washer (3) are assembled between the head end of the test bolt (2) and the body sleeve. In the slip test step, the relative position of the toothed end of the body sleeve flange and the large-end flange electrophoresis plate (7) is recorded by engraving.

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