A railway wheel boring machine for machining the bore of the hub of the railway wheel. The machine includes a base, a column, a workhead sliding on the column, a rotatory boring bar arranged on the workhead, and a non-rotatory clamping plate. Associated with the non-rotatory clamping plate is a clamping unit for clamping and centering the railway wheel. The clamping unit includes at least three jaws that move along straight paths converging at the center or center portion of the non-rotatory clamping plate. Each jaw is attached to a transmission rod having a first end attached to the jaw and a second end attached to a slewing ring that is driven to rotate by actuators. The rotating of the slewing ring drives the transmission rods to move the jaws to secure the railway wheel.

A railway wheel boring machine for machining the bore of the hub of the railway wheel. The machine includes a base, a column, a workhead sliding on the column, a rotatory boring bar arranged on the workhead, and a non-rotatory clamping plate. Associated with the non-rotatory clamping plate is a clamping unit for clamping and centering the railway wheel. The clamping unit includes at least three jaws that move along straight paths converging at the center or center portion of the non-rotatory clamping plate. Each jaw is attached to a transmission rod having a first end attached to the jaw and a second end attached to a slewing ring that is driven to rotate by actuators. The rotating of the slewing ring drives the transmission rods to move the jaws to secure the railway wheel.

A thermally insulated container (10) includes an inner container (11), and an outer container (14) surrounding the inner container (11) via a void (15). Each of the inner container (11) and the outer container (14) contains a fiber reinforced plastic prepared by impregnating a base material with a resin. The inner container (11) includes a first tubular container (13) and a second tubular container (22) each having an internal holder (23, 24) to reserve a refrigerant (16), and a refrigerant inlet tube (12) through which the refrigerant (16) is introduced. The holder (24) is in communication with the holder (23). The base material in each of a predetermined area of the second tubular container (22) and a predetermined area of the outer container (14) contains woven fabrics. The predetermined area of the outer container (14) further includes a honeycomb sheet.