Repair Method For Deformation And Damage of 300KW Diesel Engine Parts

The cylinder block and cylinder head parts of a 300KW diesel engine are mostly thin-walled parts, with a simple structure and high accuracy requirements. In products, the pressure energy of compressed air is mainly converted into mechanical energy, and the driving mechanism realizes reciprocating linear motion, swinging or rotating motion, and bears a certain force. The processing quality directly affects the functionality and lifespan of the product. Each 300KW diesel engine has cylinder block and cylinder head parts, which are often affected by severe deformation during processing, affecting their dimensional and shape accuracy.

To solve this problem, it is necessary to analyze the reasons and take effective measures to ensure the accuracy of the parts. Improve part structure or process methods to control deformation. By improving the structure of the cylinder block and cylinder head, and improving the process methods, the stress is completely released, reducing or controlling the deformation of the parts. After rough machining, the parts undergo aging treatment to eliminate stress. During machining, cutting fluid cooling is used to prevent deformation caused by cutting heat. It may also affect part deformation. The clamping method is radial clamping, which has a large clamping force and can cause significant deformation.

Due to the different deformation parts and degrees of the cylinder block and cylinder head of a 300KW diesel engine, the repair methods are also different. The commonly used methods are as follows.

The protrusions near the screw holes on the cylinder block surface can be polished with an oilstone or a fine file.

The unevenness of the cylinder block and cylinder head can be repaired by milling and grinding.

When milling and repairing the upper surface of 300KW diesel engine cylinder block, the center line of main bearing hole and cylinder hole shall always be used as the machining positioning reference. The upper surface of each cylinder block can be repaired up to two times, with each repair amount less than 0.25mm and the total repair amount not exceeding 0.50mm.

After grinding the upper surface of the cylinder block, check the height H of the cylinder block, which should be within the allowable range. Different engines have different values, please read the manual carefully when repairing. At the same time, when milling the cylinder block surface, in order to maintain the normal clearance between the piston and valve and the original compression ratio of the cylinder, a thickened cylinder gasket should be selected.

The unevenness of the cylinder block and cylinder head can also be smoothed, coated, and ground with a spatula, and the cylinder head can be ground flat together on the cylinder block.

Cylinder head warping can be corrected by tapping. Place a steel plate gasket with a thickness of approximately 4 times the deformation of the cylinder head between the cylinder head and the flat plate. Press the pressure plate onto the middle of the cylinder head, tighten the bolts to make the middle plane of the cylinder head close to the plane, and use a small hammer to strike along the rib of the cylinder head three times to reduce the internal stress generated during compression deformation. After staying for 5 minutes, move the pressure plate to 1/3 of the total length for tapping, and finally move it to 1/3 of the other end for tapping.

If the cylinder head warps diagonally, the pressure plate should be pressed diagonally onto the cylinder head. If the pressure is too high, the cylinder head can be placed next to the forging furnace and heated for a while to eliminate it. After the cylinder head plane is warped, it can also be ground and trimmed.

Jiangsu Starlight Electricity Equipments Co.,Ltd. has a young and professional technical backbone team, with an average working age of more than 10 years in the generator unit industry. There are 64 sales and service departments throughout the country to provide users with a one-stop service of machine room design, equipment supply, commissioning and maintenance at any time. No matter when and where, a well-trained service team will provide you with comprehensive and considerate protection. For more details, please contact us with sales@dieselgeneratortech.com.