DE2545944A1 - Tolerance equalisation for butt welder for plastics - with heating rods on both flanks of components to be welded - Google Patents

Abstract

Device for tolerance equalisation in a butt welding machine for welding plastic profiled components comprises heating rods which are mounted parallel on both flanks of the components to be welded, in unbalanced zones. The heating rods heat the flanks in narrowly defined strips, so that due to pressure on the flat bottom parts, the upwardly facing surfaces, in which the tolerances take full effect, can also be pressed flat or flush with each other at the joint. Clamping means conventionally used on butt welders are used with pressure distributing plates. Temp. of the heating rods pref. decreases continuously outwards from the weld seam. The clamping means or pressure plates may be mounted movably, so that upsetting proceeds away from the weld seam according to the temp. drop in the heating rods, preventing tolerances equilisation from being perceived optically.

Description

Am writing! Tolerance compensation when welding plastic profiles I name myself as the inventor and apply for patent protection The invention concerns a device to compensate for the production of plastic objects (predominantly in extrusion) tolerances that cannot be avoided in production, which make it difficult to work off the weld beads after welding.

For efficient processing (cleaning) of the butt welding by means of Hot mirrors, zOBO with PVC window profiles, the resulting weld bead is completely flat surface of the parts to be welded at the joint cannot be achieved in practice, However, desirable. As a production of plastic profiles ozone tolerance Eliminates cost reasons, the invention provides for an optically imperceptible Tolerance compensation during the heating-up time.

The welding methods currently used do not take profile tolerances into account. After the weld bead has cooled down, you will be cleaning it using abrasives balanced. This causes the homogeneous surface to be destroyed by roughening. At that time there is still another work step for cleaning the weld bead required for re-smoothing the surface.

In order to shorten this time drastically, the pickles are commercially available Welding machines already existing energies heat and pressure to compensate for tolerances exploited in such a way that parallel to the unststoffteilen to be connected during they are softened by the stimulus mirrors on the frontal surfaces on both sides in an adequate manner Length in a zone that is neutral with regard to the tolerance effect, the flanks are also heated werden0 The clamps of the welding machines that hold the profile pieces to be welded Hold tight during the entire welding process, the clamped parts will compress tapering slightly from the surface, so that they can also be seen on their upper Tolerance compensation when welding plastic profiles "sides (with the lower sides on the Machine supports they are flat anyway!) In the joint there are no differences in height have more. Over-upsetting is avoided by taking the path of the clamping plates limited. So that the upsetting does not appear visually, the difference in height must be balanced between the parts to be welded by the weld bead will. This is achieved by mounting the clamping plates so that they can move and and the profile flanks are heated away from the weld bead with falling temperatures. Through this it is achieved that the pressure on the ropes to be connected with decreasing temperature less and less compresses.

Are the welded plastic parts flat on both visible surfaces or at least flush, the cleaning can be done solely on the narrow area of the Restrict weld bead9 Any further destruction of the surface, as it is still unavoidable to this day for tolerance compensation, is omitted. The cleaning can then be done automatically with narrow milling heads, which - if necessary - polishing tools downstream are 0

Claims (3)

P a t e n t a n s p r ü c h e: 1.) Equipment on butt welding machines to compensate for tolerances when welding plastic profile parts by means of heated mirrors characterized in that / parallel on both flanks of the to be welded Parts are placed in intolerance zones heating rods, which also the flanks Warm up in narrowly delimited strips, so that by applying pressure on the ones lying flat below Also share the upturned surfaces that experience has shown to have tolerances have full effect, can be pressed flat or flush with one another at the joint, for which purpose the clamping plates or clamps with pressure distribution plates that are common on M tumuf welding machines be used. 2.) Tolerance compensation device according to claim 1, characterized in that that the temperature in the parts parallel to the parts to be welded in their flanks applied heating elements from the weld seam drops continuously to the outside. 3.) tolerance compensation device according to claim 1, d a d u r c h g It is not noted that the tensioner with pressure distribution plates or the Printing plates are movably mounted, by a running of the compression accordingly the temperature drop in the bracing elements away from the weld seam is reached, "Tolerance compensation when welding plastic profiles "so that the tolerance compensation is not optically more is perceived. 4o) Toeranz compensation device according to claim 1, characterized in that that the eg of the movably mounted clamping plates or clamps with Druckverteiluigsplatten limited by scanning the minor tolerance on one of the parts to be welded becomes that an overstepping is not possible,