Structure of main frame for construction machines and method of manufacturing the same

摘要

A structure of a main frame of a construction machine and a method for manufacturing the same are invented. Portions of the main frame to which an external force is applied by traveling units and working machines are formed into unitary casting modules, and the other portions of the main frame are formed into modules of sheeted structures. Then, these modules are combined to form the main frame. In the manufacturing process, required machining operations for the modules are completed before the combining of the same modules together.