| 摘要 |
A mold and process for integrally forming a modular helical shaped device such as a screw conveyor is disclosed. The mold has a center operating axis (26) and includes a first section (20A) which forms a portion of the axial member (33). The first section (20A) also forms one of the helical surfaces (36A) disposed around the center axis (26) which has an amount of rotation no greater than 360 degrees. In a similar manner, a second section (20B) is adapted for reciprocating movement along the center axis (26) between an open and closed position with respect to section (20A). The second section (20B) forms the other one of the helical shaped flight members (41). Thus, the two mold sections define a substantially enclosed cavity having an elongated axial portion and a helical shaped flight portion with a selected cross-section that forms the helical shaped device. In a preferred embodiment, there is also included a center rod member (62) which is coaxial with the axial cavity (34A) and operates so that when withdrawn from the cavity it provides an aperture in the resulting axial member (33) of the helical shaped device. In addition, the mold and technique may be used to form helical shaped devices having more than one flight member so long as each flight member does not overlap another flight member.
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