Fixing device for machining chassis of crane

The utility model discloses a fixing device for machining an underframe of a crane. The fixing device for machining the underframe of the crane comprises a base (100) and a positioning piece (200), the base (100) is fixedly arranged on a table board of a processing machine tool and is used for providing support for the underframe (300); and the positioning piece (200) is configured to position the bottom frame (300) on the base (100) and enable the form and location tolerance formed between the mounting surface of the bottom frame (300) and a plane defined by the four trunnion holes to meet the preset requirement. The fixing device disclosed by the utility model can ensure that the mounting surface of the processed chassis is qualified. 本实用新型公开了一种用于起重机的底架加工的固定装置，所述用于起重机的底架加工的固定装置包括底座(100)和定位件(200)；所述底座(100)固定设置于加工机床台面以用于向底架(300)提供支撑；所述定位件(200)被构造为能够将所述底架(300)定位在所述底座(100)上并使所述底架(300)的安装面与四个耳轴孔所限定的平面之间形成的形位公差符合预设要求。本实用新型的固定装置能够保证加工后的底架的安装面合格。