The dimensional accuracy requirements for motorcycle forgings are generally determined based on the specific functions and installation requirements of the components. Dimensional accuracy can be measured in several aspects:
Dimensional tolerance: The dimensional tolerance of motorcycle forgings refers to the allowable deviation range between the specified dimensions on the design drawing and the actual processed dimensions. It is usually expressed in millimeters. For example, the crankshaft forging of a motorcycle engine requires high precision, and its dimensional tolerance may be only a few tens of micrometers.
Surface finish: The surface finish requirements of motorcycle forgings depend on the specific functions of the components. For example, components such as cylinder blocks and pistons that work in high temperature and pressure environments require high surface finish to ensure sealing and friction performance.
Geometric shape accuracy: The geometric shape accuracy of motorcycle forgings refers to the requirements for their external shape, hole positions, and fit dimensions. Examples include roundness of the crankpin holes in a crankshaft and radial deviation of the small end of a connecting rod. The accuracy of these requirements directly affects the assembly and performance of the components.
Processing accuracy: The processing accuracy requirements for motorcycle forgings mainly include dimensional control during processes such as casting, forging, heat treatment, as well as subsequent machining and grinding operations.
In general, motorcycle forgings have high dimensional accuracy requirements, which need specific design and process control based on the functions and requirements of the components. In most cases, these accuracy requirements are specified in relevant standards and technical requirement documents.