Device for Cold Expansion of Fastener Holes

摘要

The invention refers to a device for cold expansion of fastener holes. The device comprises a hydraulic cylinder (27) in which a piston (26) with a piston rod (25) is placed, to whose end a mandrel (1) of a tool (60) is fixed. In a flange (9) a thread is made, through which an immovable fixation of the tool (60) is implemented, such that in an axial blind hole (55) of the piston rod (25), a linear displacement sensor (34), is positioned, immovably fixed to the hydraulic cylinder (26). A magnet (33) is designed for activating the linear displacement sensor (34), which is connected to the control block (38). The advantage of the device is in the possibility to control the degree of cold expansion.

主权项

1. A device for cold expansion of fastener holes comprising a hydraulic cylinder in which a piston with a piston rod is placed to whose end a mandrel of a tool is fixed for performing the expansion, in a flange (9), fixed to the hydraulic cylinder (27), a thread is made, through which an immovable fixation of the tool (60) is implanted, in an axial blind hole (55) of the piston rod (25), a linear displacement sensor (34) is placed and fixed immovably to the hydraulic cylinder (27), between the flange (9) and the hydraulic cylinder (27) immovably and coaxially a shutter (28) is placed, and radial holes (49, 52) are produced in the hydraulic cylinder (27), through which the working fluid enters respectively piston and rod chambers(50, 51) of the hydraulic cylinder (27).