| 摘要 |
<p>#CMT# #/CMT# The method comprises forming a core, which defines flow channel (8) in interior of an impeller (1), from two core parts from which a first core part is extracted along a curved web radial from the flow channel after injection molding process and subsequently a second core part (26) carries an additional relative movement between the impeller and the second core part in a direction transverse to pulling direction of the second core part before or during the extracting process. The pulling direction of the two core parts passes radial towards outside along a curved web. #CMT# : #/CMT# The method comprises forming a core, which defines flow channel (8) in interior of an impeller (1), from two core parts from which a first core part is extracted along a curved web radial from the flow channel after injection molding process and subsequently a second core part (26) carries an additional relative movement between the impeller and the second core part in a direction transverse to pulling direction of the second core part before or during the extracting process. The pulling direction of the two core parts passes radial towards outside along a curved web in longitudinal direction of the flow channel. The two core parts of the core, which define the flow channel in the interior of the impeller lie to each other in axial direction or circumferential direction related to the impeller-rotation axis and carry the relative movement between the impeller and core part in axial direction or in circumferential direction. The relative movement is carried out between the impeller and the core part. The impeller is freely movable in a direction transverse to pulling direction of the core parts. The core has three core parts, where two core parts are movably mounted on different parts of external tool. The first core part is subjected on a first part of the external tool and the second core part is subjected on a second part of the external tool. The first and second part of the tool are moved to each other after the pulling process. The two core parts are guidable to each other. #CMT#USE : #/CMT# Method for injection molding a pump impeller useful for its production. #CMT#ADVANTAGE : #/CMT# The method ensures efficient injection molding of a pump impeller with good quality. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a schematic representation of a second core part. 1 : Impeller 2 : Cover disc 6 : Rotor blades 8 : Flow channel 26 : Second core part.</p> |
