Application of wedge block in casting process of automobile clutch flywheel

The clutch flywheel is one of the main parts of the automobile transmission mechanism, which is the key to cut off and transfer power between the engine and the transmission system. It is a wheel accumulator with large moment of inertia, which is installed on the rotary shaft of the vehicle. It is a rotating component with appropriate moment of inertia and plays the role of storing and releasing kinetic energy. When the speed of the vehicle increases, the kinetic energy of the flywheel increases and the energy is stored up; When the speed of the vehicle decreases, the kinetic energy of the flywheel decreases and the energy is released. At the same time, the clutch flywheel can also be used to reduce the speed fluctuation in the process of vehicle rotation. The comprehensive performance of the clutch flywheel directly affects the safety of the transmission system and the stability of the whole vehicle operation, which requires that the casting must be compact and free from shrinkage porosity, shrinkage cavity and inclusion; The thickness difference between the upper and lower wall must also be controlled in a reasonable range, so as to ensure the minimum unbalance in the process of casting rotation on the premise of meeting the requirements of mechanical properties.

At present, all clutch flywheels in our company are cast by vertical molding line, and the size of molding plate in the production line is 650mm in length and 535m in width. Combined with the existing production equipment, the author uses the principle of balanced solidification, combined with the guidance of disa application manual, by adding a wedge block on the casting, under the premise of ensuring the mechanical properties of the casting, the shrinkage defects at the connection between the outer circle of the clutch Flywheel Casting and the disk surface can be eliminated, and the problem of dynamic balance out of tolerance of the casting can be thoroughly solved.

Reasonable process plan can make up for the deficiency of casting design and fundamentally solve the shrinkage defects inside the casting; In order to avoid a large number of waste products caused by excessive dynamic balance of castings due to the combined factors of large wall thickness difference between upper and lower parts and shrinkage defects inside castings in vertical parting production. From the results of batch production, the casting quality has been greatly improved, the output is stable, and the company has created higher economic benefits. This process has been successfully copied to other similar disc casting production process, which has great reference significance.