Construction method for virtual simulation machining platform of multi-spindle-head numerical control machine tool

The invention discloses a method for constructing a virtual simulation machining platform of a multi-spindle-head numerical control machine tool, which comprises the following steps of: firstly, creating a virtual shaft according to a multi-spindle-head library of the multi-spindle-head numerical control machine tool, constructing a topological structure of each motion shaft of the multi-spindle-head numerical control machine tool, and constructing a geometric model of the virtual numerical control machine tool; a macro program is obtained by changing the position of each spindle head assembly in a virtual axis in a virtual numerical control machine tool structure project tree and a geometric model, and the macro program for replacing the spindle head is used as a subprogram to replace a functional instruction for replacing the spindle head in an NC program through a macro calling instruction. The virtual numerical control machine tool actually executes the macro program for replacing the spindle head when ex