초록 ▼

In a method of explosively expanding a tubular metal component into engagement with a surrounding metal component, an explosive charge is disposed axially and fired in an insert having a hollow cylindrical container fitting closely within the portion of the tubular metal component to be expanded and

In a method of explosively expanding a tubular metal component into engagement with a surrounding metal component, an explosive charge is disposed axially and fired in an insert having a hollow cylindrical container fitting closely within the portion of the tubular metal component to be expanded and having charge holding device, for example an axial pocket, to accommodate the explosive charge, the container being filled with a shock wave-transmitting liquid. Compared with solid inserts, the novel hollow insert is cheaper and requires a smaller explosive charge for a given operation. The method is especially advantageous for expanding large diameter tubes.

대표청구항 ▼

A shock wave-transmitting insert for holding an explosive charge axially within a tubular metal element to be expanded and to transmit the shock wave from the said charge to the said tubular metal element when the charge is fired, characterised in that the said insert comprises a hollow cylindrical

A shock wave-transmitting insert for holding an explosive charge axially within a tubular metal element to be expanded and to transmit the shock wave from the said charge to the said tubular metal element when the charge is fired, characterised in that the said insert comprises a hollow cylindrical container and charge-holding means to accommodate an explosive charge and locate it axially within the container, said container being adapted in use to be filled with a shock wave-transmitting liquid.