An automobile exhaust pipe weld fatigue test fixture and test method

Abstract

The application discloses a kind of automobile exhaust pipe weld fatigue test fixture and test method, belong to automobile detection field.A kind of automobile exhaust pipe weld fatigue test fixture and test method, include: including: base;Mounting plate, fixedly connected on base;Object plate, is connected on mounting plate;Test pipe fitting, is connected on object plate;Adjusting screw, is threadedly connected on base;The adjusting screw is four, and the adjusting screw is symmetrically distributed on base;The angle of test pipe fitting can be adjusted in multiple directions by the device, in the testing process, no longer be limited by the shape of test pipe fitting, angle, different shapes, different angle test pipe fitting can be tested, no longer need to design separate corresponding fixture according to the shape of test pipe fitting, reduce test cost, improve test efficiency simultaneously.

Description

Technical Field

[0001] This invention relates to the field of automotive testing, and more particularly to a fatigue testing fixture and method for automotive exhaust pipe welds. Background Technology

[0002] The exhaust pipe of a car is subjected to the thermal shock of the exhaust gas and the vibration impact brought about by the car's driving. In order to ensure the sealing of the weld and the reliability of the exhaust pipe, it is necessary to conduct bench fatigue test on the weld of the exhaust pipe.

[0003] The existing test method is to fix the connecting flange of the exhaust pipe and apply a periodically varying force in the direction perpendicular to the axis of the exhaust pipe to test the changes in the performance and geometric parameters of the components under a certain periodic force. The test fixture needs to bear a large fatigue load and needs sufficient fatigue resistance. Therefore, the hinge, eccentric wheel adjustment and other methods are not suitable for this test fixture.

[0004] Currently, to ensure the reliability of the test, the test fixtures are all of the fixed angle type. The test fixtures can only meet the requirements of exhaust pipes with the same angle. For different engines, the bending angle of the exhaust pipe and the connecting flange are very different. Each time a different exhaust pipe with a different angle is used, a special fixture needs to be designed and manufactured separately. This not only increases the test cost, but may also affect the test schedule. Summary of the Invention

[0005] This invention provides a fatigue testing fixture and method for automotive exhaust pipe welds to address the problem that the efficiency of existing fixture testing needs further improvement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A fatigue testing fixture for automotive exhaust pipe welds includes:

[0008] Base;

[0009] Mounting plate, fixedly connected to the base;

[0010] The loading platform is attached to the mounting plate.

[0011] The test tube is rotatably connected to the carrier plate at one end.

[0012] Adjusting screw, threaded connection to the base;

[0013] There are four adjusting screws, which are symmetrically distributed on the base.

[0014] Preferably, the mounting plate is inclinedly connected to the base.

[0015] Preferably, the angle between the mounting plate and the base is 40°.

[0016] Furthermore, the mounting plate has a first screw slot and a second screw slot, and the carrier plate is connected to an adjusting screw, which is slidably inserted into the first screw slot and the second screw slot.

[0017] Furthermore, both the first screw groove and the second screw groove are annular grooves, and the first screw groove and the second screw groove are symmetrically arranged on the mounting plate.

[0018] Furthermore, the test fitting is an arc-shaped tube.

[0019] Furthermore, the arc-shaped tube is composed of a bent section and a straight end, and the bent section is fixedly connected to the carrying plate.

[0020] Furthermore, a rib plate is fixedly connected to the base, and the rib plate is fixedly connected to the mounting plate.

[0021] A fatigue testing method for automotive exhaust pipe welds includes a fatigue testing fixture for automotive exhaust pipe welds, and the specific testing steps are as follows:

[0022] Step 1: Secure the base to the workbench;

[0023] Step 2: Connect the test tube to the carrier plate;

[0024] Step 3: Connect the test tube plate to the mounting plate using fixing screws;

[0025] Step 4: Adjust the test angle of the test fitting according to its shape;

[0026] Step 5: After fixing the carrier plate, conduct tests on the test pipe.

[0027] The angle adjustment in step four includes preliminary adjustment and secondary adjustment;

[0028] The initial adjustment step is to rotate the carrier plate so that it rotates around the fixing screw, and the adjusting screw slides in the annular groove until the axis of the test tube is roughly parallel to the vertical direction of the base.

[0029] The secondary adjustment step involves adjusting the four sets of adjusting screws on the base until the axis of the test tube is completely parallel to the vertical direction of the base.

[0030] Compared with the prior art, the present invention provides a fatigue testing fixture and method for automotive exhaust pipe welds, which has the following beneficial effects:

[0031] 1. This multi-dimensional adjustable angle automotive exhaust pipe weld fatigue test fixture allows for multi-directional adjustment of the angle of the test pipe. During the test, it is no longer limited by the shape and angle of the test pipe, and can test test pipes of different shapes and angles. It eliminates the need to design separate corresponding fixtures based on the shape of the test pipe, reducing test costs and improving test efficiency. Attached Figure Description

[0032] Figure 1 This is a front view schematic diagram of a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention.

[0033] Figure 2 This is a rear view structural schematic diagram of a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention.

[0034] Figure 3 This is a side view of a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention.

[0035] Figure 4 This is a schematic diagram of the base before adjustment in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention. Figure 1 ;

[0036] Figure 5 This is a schematic diagram of the base adjustment in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention. Figure 1 ;

[0037] Figure 6 This is a schematic diagram of the base before adjustment in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention. Figure 2 ;

[0038] Figure 7 This is a schematic diagram of the base adjustment in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention. Figure 2 ;

[0039] Figure 8 This is a schematic diagram of the load plate before rotation in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention.

[0040] Figure 9 This is a schematic diagram of the rotating platform in a fatigue testing fixture for automotive exhaust pipe welds proposed in this invention.

[0041] In the diagram: 1. Base; 2. Adjusting screw; 3. Rib plate; 4. Mounting plate; 5. Screw hole; 6. First screw slot; 7. Second screw slot; 8. Fixing screw; 9. Loading plate; 901. Test fitting; 902. Adjusting screw. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Example 1:

[0044] Reference Figure 1-3 A fatigue testing fixture for automotive exhaust pipe welds, comprising:

[0045] Base 1;

[0046] Mounting plate 4 is fixedly connected to base 1;

[0047] The loading plate 9 is connected to the mounting plate 4;

[0048] Test fitting 901 is connected to the carrier plate 9;

[0049] Adjusting screw 2 is threaded onto base 1;

[0050] There are four adjusting screws 2, and the adjusting screws 2 are symmetrically distributed on the base 1.

[0051] The mounting plate 4 has screw holes 5, and the carrying plate 9 is threaded with fixing screws 8, which match the screw holes 5.

[0052] Mounting plate 4 is inclinedly connected to base 1;

[0053] The angle between the mounting plate 4 and the base 1 is 40°.

[0054] The mounting plate 4 has a first screw groove 6 and a second screw groove 7. The carrying plate 9 is connected to an adjusting screw 902, which is slidably inserted into the first screw groove 6 and the second screw groove 7.

[0055] The first screw groove 6 and the second screw groove 7 are both annular grooves, and the first screw groove 6 and the second screw groove 7 are symmetrically arranged on the mounting plate 4.

[0056] The test fitting 901 is an arc-shaped pipe.

[0057] The arc-shaped tube consists of a bent section and a straight end, with the bent section fixedly connected to the carrying plate 9.

[0058] Reference Figure 2 During the test, the front end of base 1 is in the X-axis direction, the side end of base 1 is in the Y-axis direction, and the vertical end of base 1 is in the Z-axis direction.

[0059] By adjusting the four adjusting screws 2 on the base 1 of the device, the heights of the front and rear adjusting screws 2 are made inconsistent, thereby enabling the angle adjustment of the mounting plate 4 in the Z direction; by adjusting the four adjusting screws 2 on the base 1, the heights of the left and right adjusting screws 2 are made inconsistent, thereby enabling the angle adjustment of the mounting plate 4 in the X direction; through the two sets of annular screw slots opened on the mounting plate 4, the XY plane of the carrying plate 9 can be rotated and adjusted around the axis of the test tube 901, thereby adjusting the axis of the test tube 901 to be perpendicular to the Z axis. This device can adjust the angle of the test tube 901 in multiple directions. During the test, it is no longer limited by the shape of the test tube 901, and can test test tubes 901 of different shapes. It is no longer necessary to design separate corresponding fixtures according to the different shapes of the test tubes 901, reducing the test cost and improving the test efficiency.

[0060] Example 2:

[0061] A fatigue testing fixture for automotive exhaust pipe welds is basically the same as that in Example 1, but with the addition that a rib plate 3 is fixedly connected to the base 1, and the rib plate 3 and the mounting plate 4 are fixedly connected.

[0062] The ribs 3 are designed to improve the stability of the mounting plate 4 during testing.

[0063] Example 3:

[0064] A fatigue testing method for automotive exhaust pipe welds includes a fatigue testing fixture for automotive exhaust pipe welds, and the specific testing steps are as follows:

[0065] Step 1: Fix base 1 onto the workbench;

[0066] Step 2: Connect the test fitting 901 to the carrier plate 9;

[0067] Step 3: Connect the carrier plate 9, on which the test tube 901 is installed, to the mounting plate 4 using fixing screws 8;

[0068] Step 4: Adjust the test angle of test fitting 901 according to its shape;

[0069] Step 5: After fixing the carrier plate 9, conduct a test on the test tube 901.

[0070] Reference Figure 2 During the test, the front end of base 1 is in the X-axis direction, the side end of base 1 is in the Y-axis direction, and the vertical end of base 1 is in the Z-axis direction.

[0071] Step four involves adjusting the angle, which includes initial adjustment and secondary adjustment.

[0072] The initial adjustment steps are to rotate the carrier plate 9 so that the carrier plate 9 rotates around the fixing screw 8 and the adjusting screw 902 slides in the annular groove until the axis of the test tube 901 is parallel to the Z-axis direction.

[0073] The secondary adjustment step involves adjusting the four sets of adjusting screws 2 on the base 1 until the axis of the test tube 901 is completely parallel to the Z-axis.

[0074] Reference Figure 4-5 During use, when the axis of the test tube 901 is perpendicular to the X-axis and the angle between it and the positive Y-axis is less than 90°, the base 1 can be tilted forward by rotating the front and rear adjustment screw 2 in the Y-axis direction. By continuously adjusting the height, the test tube 901 can be made perpendicular to the Z-axis, thereby achieving the test conditions for vertical load application.

[0075] Example 4:

[0076] A fatigue testing method for automotive exhaust pipe welds includes a fatigue testing fixture for automotive exhaust pipe welds, and the specific testing steps are as follows:

[0077] Step 1: Fix base 1 onto the workbench;

[0078] Step 2: Connect the test fitting 901 to the carrier plate 9;

[0079] Step 3: Connect the carrier plate 9, on which the test tube 901 is installed, to the mounting plate 4 using fixing screws 8;

[0080] Step 4: Adjust the test angle of test fitting 901 according to its shape;

[0081] Step 5: After fixing the carrier plate 9, conduct a test on the test tube 901.

[0082] Reference Figure 2 During the test, the front end of base 1 is in the X-axis direction, the side end of base 1 is in the Y-axis direction, and the vertical end of base 1 is in the Z-axis direction.

[0083] Step four involves adjusting the angle, which includes initial adjustment and secondary adjustment.

[0084] The initial adjustment steps are to rotate the carrier plate 9 so that the carrier plate 9 rotates around the fixing screw 8 and the adjusting screw 902 slides in the annular groove until the axis of the test tube 901 is parallel to the Z-axis direction.

[0085] The secondary adjustment step involves adjusting the four sets of adjusting screws 2 on the base 1 until the axis of the test tube 901 is completely parallel to the Z-axis.

[0086] Reference Figure 6-7During use, when the angle between the axis of the test tube 901 and the X-axis is less than 90°, the base 1 can be tilted backward by rotating the left and right adjusting screws 2 in the X-axis direction. By continuously adjusting the height, the test tube 901 can be made perpendicular to the Z-axis, thereby achieving the test conditions for vertical load application.

[0087] Example 5:

[0088] A fatigue testing method for automotive exhaust pipe welds includes a fatigue testing fixture for automotive exhaust pipe welds, and the specific testing steps are as follows:

[0089] Step 1: Fix base 1 onto the workbench;

[0090] Step 2: Connect the test fitting 901 to the carrier plate 9;

[0091] Step 3: Connect the carrier plate 9, on which the test tube 901 is installed, to the mounting plate 4 using fixing screws 8;

[0092] Step 4: Adjust the test angle of test fitting 901 according to its shape;

[0093] Step 5: After fixing the carrier plate 9, conduct a test on the test tube 901.

[0094] Reference Figure 2 During the test, the front end of base 1 is in the X-axis direction, the side end of base 1 is in the Y-axis direction, and the vertical end of base 1 is in the Z-axis direction.

[0095] Step four involves adjusting the angle, which includes initial adjustment and secondary adjustment.

[0096] The initial adjustment steps are to rotate the carrier plate 9 so that the carrier plate 9 rotates around the fixing screw 8 and the adjusting screw 902 slides in the annular groove until the axis of the test tube 901 is parallel to the Z-axis direction.

[0097] The secondary adjustment step involves adjusting the four sets of adjusting screws 2 on the base 1 until the axis of the test tube 901 is completely parallel to the Z-axis.

[0098] Reference Figure 8-9 During use, when the test tube 901 is not perpendicular to the Y-axis, by rotating the carrier plate 9, the carrier plate 9 will drive the test tube 901 to rotate around the fixing screw 8. By continuously adjusting the rotation, the test tube 901 can be made perpendicular to the Z-axis, thereby achieving the test conditions of vertical load loading.

[0099] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fatigue testing fixture for automotive exhaust pipe welds, characterized in that, include: Base (1); Mounting plate (4) is fixedly connected to base (1); The loading plate (9) is rotatably connected at one end to the mounting plate (4); Test fitting (901) is connected to the carrier plate (9); Adjusting screw (2) is threaded onto base (1); There are four adjusting screws (2), and the adjusting screws (2) are symmetrically distributed on the base (1); The mounting plate (4) is inclinedly connected to the base (1); The angle between the mounting plate (4) and the base (1) is 40°; The mounting plate (4) is provided with a first screw groove (6) and a second screw groove (7), and the carrier plate (9) is connected with an adjusting screw (902), which is slidably inserted into the first screw groove (6) and the second screw groove (7). The first screw groove (6) and the second screw groove (7) are both annular grooves, and the first screw groove (6) and the second screw groove (7) are symmetrically arranged on the mounting plate (4); The test fitting (901) is an arc-shaped tube.

2. The fatigue testing fixture for automotive exhaust pipe welds according to claim 1, characterized in that, The arc-shaped pipe consists of a bent pipe section and a straight pipe end, and the bent pipe section is fixedly connected to the carrying plate (9).

3. The fatigue testing fixture for automotive exhaust pipe welds according to claim 1, characterized in that, A rib plate (3) is fixedly connected to the base (1), and the rib plate (3) and the mounting plate (4) are fixedly connected.

4. A fatigue testing method for automotive exhaust pipe welds, using a fatigue testing fixture for automotive exhaust pipe welds as described in any one of claims 1-3, characterized in that, The specific experimental steps are as follows: Step 1: Fix the base (1) on the workbench; Step 2: Connect the test fitting (901) to the carrier plate (9); Step 3: Connect the carrier plate (9) with the test tube (901) installed to the mounting plate (4) using fixing screws (8); Step 4: Adjust the test angle of the test fitting (901) according to its shape; Step 5: After fixing the carrier plate (9), conduct a test on the test tube (901).

5. The fatigue test method for automotive exhaust pipe welds according to claim 4, characterized in that, The angle adjustment in step four includes preliminary adjustment and secondary adjustment; The preliminary adjustment step is to rotate the carrier plate (9) so that the carrier plate (9) rotates around the mounting plate (4) by the fixing screw (8) and the adjusting screw (902) slides in the annular groove until the axis of the test tube (901) is parallel to the vertical direction of the base (1); The secondary adjustment step involves adjusting the four sets of adjusting screws (2) on the base (1) until the axis of the test tube (901) is completely parallel to the vertical direction of the base (1).

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