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Apparatus for deforming a tubular slug of thermoplastic material
| Details |
Inventors: Rosenkranz, Otto; Seifert, Karl-Heinrich; Horwege, Claus;
Assignee: Heidenreich & Harbeck Zweingniederlassung der Gildemeister AG (DT)
Primary Examiner: Lazarus; Richard B.
Assistant Examiner:
Attorney, Agent or Firm: Cullen, Settle, Solman & Cantor
A tubular slug of thermoplastic material is preheated and is then gripped a position spaced from an open end of the slug, the gripping means being such as to effect a reduction in cross-section of the gripped portion of the slug. Such reduction in cross-section provides a shoulder which abuts the gripping means during application of pressure to the end face of the slug to deform the end portion thereof to provide a thread, groove or other profiled formation. |
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DETAILED DESCRIPTION In accordance with the invention, the hollow body is gripped at a position spaced from the tube end and a reduction in section thereby produced, the tube end portion then being deformed by the application of pressure to its end face.
The reduction in section, or waisting, of the preheated tube end portion is used as a means of securing and sealing.
The material of the tube end is clamped by the waisted portion, and contact between the tube end and corresponding parts of the gripping tool produces cooling and increasing solidification of the tube end in the region of the waisted zone so that the tube end is held securely during the ensuing application of axial pressure to effect reshaping.
During the shaping operation, the clamping of the tube end is the sole means of fixing the hollow body and, in fact, the hollow body can be modified or reshaped at either side of the fixing location in an independent manner, that is to say at one side a profile can be produced and at the other side the hollow body can be blow-moulded, for example to give it its final form.
The tubular end of the hollow body can be gripped between a core and an outer ring, the ring consisting of at least two parts which are component parts of an external mould and, when the latter is closed, reduce the external diameter of the tube end by between 2% and 10%.
Preferably, a section reduction of about 5% will be produced.
The ring can be radiussed at the split plane of the external mould so that the tube material cannot penetrate into the joints.
This prevents any flash from forming in the region of the waisted zone.
The tube end which is deformed then contains rounded formations although these are in no way disadvantageous in subsequent use.
The core engaging in the tube end is preferably provided with a shoulder and is conical in shape with a cone angle of 0.
2.
degree.
to 3.
degree.
.
Tapering of the core facilitates the extraction of the hollow body from the mandrel, after the forming operation.
The end surface of the tube comes up against the shoulder of the mandrel
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