Engine cylinder cover bolt stress-strain testing method

Abstract

The invention provides an engine cylinder cover bolt stress-strain testing method, which comprises the following steps of: determining a measuring point and selecting a measuring position; polishing: polishing the measurement position; strain gauge installation: installing a strain gauge at the polished measurement position; wiring is performed; signal verification: verifying the validity of the strain gauges; and after installation is completed, testing is carried out according to requirements after the engine is started. According to the method, engine designers and manufacturers can be helped to evaluate the stress and deformation conditions of the engine cylinder cover bolt under various load conditions, so that the reliability and the performance of the engine cylinder cover bolt are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of engine detection, and in particular relates to a stress-strain testing method for engine cylinder head bolts. Background Art

[0002] Bolted connections are common and important connecting mechanisms in mechanical equipment. Cylinder head bolts connect the cylinder head and the engine body, and are one of the most demanding bolts in engine parts. During installation, they must withstand a large preload; during engine operation, they must withstand complex alternating loads, the size and direction of which change with the change of the crankshaft angle, so cylinder head bolts are also one of the most complex parts of diesel engines. Therefore, it is very important to perform stress and strain tests on high-strength bolts. Summary of the invention

[0003] In order to solve the technical problems in the prior art, the present invention provides a method for testing the stress and strain of engine cylinder head bolts, comprising the following steps:

[0004] Determine the measuring point and select the measuring position;

[0005] Grinding: Grinding the measuring position;

[0006] Strain gauge installation: Install the strain gauge at the polished measuring position;

[0007] wiring;

[0008] Signal verification, to test the effectiveness of the strain gauge;

[0009] After the installation is complete, you can then start the engine and test it as required.

[0010] Furthermore, determining the measuring point specifically includes: selecting the patch position at the appropriate position of the bolt and marking it; and ensuring that it is not easy to fall off during the test.

[0011] Furthermore, the grinding specifically includes: grinding at the bolt patch position until the surface is smooth.

[0012] Furthermore, the strain gauge installation specifically includes: during installation, the strain gauge should be mounted according to the x, y, and z directions of the strain gauge, glue should be applied under the strain gauge, and it should be pressed for 30 seconds until the glue solidifies.

[0013] Furthermore, signal verification specifically includes: after the strain gauge is attached and the wire is connected, its effectiveness needs to be tested, the signal wire is connected to the signal connection module, the connection is confirmed on the device computer whether it is normal, and the strain gauge is gently pressed to observe the signal change.

[0014] Furthermore, the method also includes the following steps: performing a first cleaning after determining the measuring point and before grinding, and performing a second cleaning after grinding and before installing the strain gauge.

[0015] Furthermore, the first cleaning specifically includes: using an appropriate cleaner and brush, thoroughly cleaning the cylinder head and bolts; ensuring that all dirt and grease are removed to keep the surface clean.

[0016] Furthermore, the second cleaning specifically includes: cleaning the polished position.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention can help engine designers and manufacturers evaluate the stress and deformation of engine cylinder head bolts under various loading conditions to ensure their reliability and performance. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific implementation methods.

[0020] The present application proposes a method for testing stress and strain of engine cylinder head bolts, which specifically comprises the following steps:

[0021] Determine the measuring point: Select the patch position at the appropriate position of the bolt and mark it. Make sure it is not easy to fall off during the test;

[0022] Cleaning: Use an appropriate cleaner and brush to thoroughly clean the cylinder head and bolts. Make sure to remove all dirt and grease to keep the surface clean;

[0023] Grinding: Grind at the bolt patch position until the surface is smooth;

[0024] Cleaning: Clean the polished area again;

[0025] Strain gauge installation: When installing, the strain gauge should be mounted in the x, y, and z directions. Apply glue under the strain gauge and press for 30 seconds until the glue solidifies.

[0026] wiring;

[0027] Signal verification: After the strain gauge is attached and the wires are connected, its effectiveness needs to be tested. Connect the signal wire to the signal connection module, confirm whether the connection is normal on the device computer, and gently press the strain gauge to observe the signal changes;

[0028] After the installation is complete, you can then start the engine and test it as required.

[0029] In summary, the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. All equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification are within the scope covered by the patent of the present invention.

Claims

1. A method for testing stress and strain of engine cylinder head bolts, characterized in that: The following steps are involved: Determine the measuring point and select the measuring position; Grinding: Grinding the measuring position; Strain gauge installation: Install the strain gauge at the polished measuring position; wiring; Signal verification, to test the effectiveness of the strain gauge; After the installation is complete, you can then start the engine and test it as required.

2. The method according to claim 1, characterized in that Determining the measuring point specifically includes: selecting the patch position at the appropriate position of the bolt and marking it; and ensuring that it is not easy to fall off during the test.

3. The method according to claim 1, characterized in that Grinding specifically includes: grinding at the bolt patch position until the surface is smooth.

4. The method according to claim 1, characterized in that The installation of strain gauges specifically includes: During installation, the strain gauges should be mounted according to the x, y, and z directions, glue should be applied under the strain gauge, and press for 30 seconds until the glue solidifies.

5. The method according to claim 1, characterized in that Signal verification specifically includes: After the strain gauge is affixed and the wire is connected, its effectiveness needs to be tested, the signal line is connected to the signal connection module, the connection is confirmed on the device computer whether it is normal, and the strain gauge is gently pressed to observe the signal changes.

6. The method according to claim 1, characterized in that The following steps are also included: The first cleaning is performed after determining the measuring point but before grinding, and the second cleaning is performed after grinding but before installing the strain gauge.

7. The method according to claim 6, characterized in that The first cleaning includes: using an appropriate cleaner and brush, thoroughly cleaning the cylinder head and bolts; making sure to remove all dirt and grease to keep the surface clean.

8. The method according to claim 6, characterized in that The second cleaning specifically includes: cleaning the polished position.