The invention is now explained in closer detail by reference to embodiments shown in the drawings, wherein:
FIG. 1 shows an insert part in accordance with the invention in a rear view;
FIG. 2 shows the insert part of FIG. 1 in a side view;
FIG. 3 and FIG. 4 each show an insert part in accordance with the invention in an axonometric view;
FIG. 5 shows an embodiment of a calibrating plate in a top view;
FIG. 6 shows an alternative embodiment of a calibrating plate;
FIG. 7 shows a detail of FIG. 6; and
FIG. 8 shows a kit of insert parts.
The insert part 1, which is shown in FIGS. 1 and 2, principally consists of a holding section 2 and a shaping section 3. On the bottom side of the shaping section 3 there is a groove 4 with a cross section which has the shape of a sector of a circle. At one end of groove 4, a delimitation stop 5 protrudes from the base of the groove, which stop is provided to keep the insert part 1 in the axial direction. The extrusion axis or an axis parallel thereto is generally designated with reference numeral 6. FIG. 2 additionally shows the direction of extrusion with the part 6a. It is shown that the delimitation stop 5 is arranged directly on the upstream face surface 7 of the insert part 1. Apart from the delimitation stop 5, the holding section 2 is composed only of the cylindrical surfaces 9. These are surfaces which consist of generatrices which are parallel to the extrusion axis 6.
FIG. 2 shows that the delimitation stop 5 has an extension B in the axial direction which corresponds approximately to one-tenth of the total length L of the insert part. A stop surface 5a of the delimitation stop 5 is inclined relative to the plane of the upstream face surface 7. The shaping section 3 comprises two mutually parallel longitudinal sides 10 which are provided on the upstream side with inlet inclines 11 which are arranged at an angle of approximately 10° and facilitate the run-up of the profile (not shown here).
FIG. 5 shows a calibrating plate 20 with a plate-like basic body 21 which comprises an opening 22 for calibrating a plastic profile 23. Insert parts 1 are inserted at a total of five critical points of the profile, which insert parts act upon the circumference of the profile 23.
An alternative calibrating plate 20 is shown in FIG. 6. A larger number of insert parts 1, 1x, 1y, 1z is provided in this case. The insert parts 1 correspond to the embodiment as shown in FIGS. 1 to 4. The insert parts 1x comprise additional projections 12 which grasp behind a groove 24 of profile 23 in order to achieve a precise formation of the groove. The insert parts 1y comprise a T-shaped shaping section 3 for forming plane surface sections of profile 23. The insert parts 1z comprise a large-surface, slightly curved shaping section 3 which is held by two holding sections 2 in the basic body 21 of calibrating plate 20 in order to accordingly form the sight sizes.
FIG. 7 shows the profile 23 plus insert parts 1, 1x, 1y and 1z on an enlarged scale in detail. FIG. 7 shows that the profile 23 is partly penetrated in its desired geometrical shape by the insert parts 1, 1x, 1y and 1z. The reason is that the insert parts 1, 1x, 1y and 1z are arranged in the calibrating plate 20 in such a way that the profile 23 is partly displaced and needs to deform elastically, as a result of which respective pressing forces for calibrating the profile 23 are generated.
FIG. 8 shows in a exemplary way a kit of seven insert parts 1a, 1b, 1c, 1d, 1e, 1f, 1g, with the insert part 1d having the nominal dimensions and being symmetrical relative to a perpendicular plane 25. The insert parts 1a, 1b, 1c differ from the inset part 1d in such a way that the shaping section 3 is offset to the left by a predetermined slight amount 26a, 26b, 26c relative to the holding section 2. Conversely, the insert parts 1e, 1f and 1g are offset to the right by an amount 26e, 26f, 26g. The dimensions 26a, 26b, 26e, 26f, 26g are graduated in a fitting manner, e.g. in steps of 0.1 mm for example. If it is noticed during initial adjustment, which is started with insert part 1d, that a different geometry of the insert part is required for optimizing the profile 23, the insert part 1d is removed and replaced by one of the remaining insert parts 1a, 1b, 1c or 1e, 1f, 1g. In this way the geometry of the calibrating plate 20 can be adjusted easily to the respective requirements without having to conduct any machining of the material.
The present invention allows producing calibrating tools which can be adjusted substantially more easily and simply and which have a longer service life than known tools.
Patent Application
20080044507
