DE2205179C - Method and device for reducing the surface roughness of workpieces made of thermoplastic material, in particular of printing unit rollers - Google Patents

Description

SIvI V ^{er lh} T ^OpIaStischcn lateral surface 8 of the friction / ylinder, the peaks 9 shown in F i e 5 j-, verurofW ^ m scale are leveled by melting and a completely _smooth surface in the shortest possible time

n ^ £ ^{Tl] miUn} ? T- ^self- evidently not limited to the Bea bemmg cylindrical workpieces with a thermoplastic surface. In the same We Se ₁ can also at different angles sleek works "o Micken or boat to proceed, even if composed workpiece to be machined entirely from thermup astischem plastic. Instead of passing the heat source, which can not only be designed as a gas burner, past the workpiece, it is also possible to move the workpiece to be machined past a stationary heat source, also at the speed required for melting.

In Fig. 3 is a further embodiment -! shown. ' Here, a krc, -shaped heat source 10 is arranged around the distribution cylinder, which is longitudinally movable is formed or against which the workpiece to be treated is moved. Instead of a gas burner Of course, hot air can also be used according to the temperature. With this Ausfui; There is no need to turn the Wen piece.

In the case of the in FIG. · Effect by merely passing the bearb to: execution of the B 4 shown to act in an oven 11 which is _gewünsch; ten Jen body reached 12.

1 sheet of drawings

Claims (6)

required effort on machine tools to patent claims: reduce. According to the invention, this is achieved by 1. Method of reducing the surface area - that the surface of the workpiece, in particular roughness of workpieces made of thermoplastic 5 of a friction cylinder, a melting process under Plastic, especially from printing throws. This is done in an advantageous manner, rolling with a thermoplastic jacket - by placing the workpiece lengthways or in a heating surface, characterized in that the source is moved, optionally with the same Surface of the workpiece, especially like turning the same. Through this measure, can a distribution cylinder, an Schmclzprozess io the surface roughness to the required minimum roughness wedge is subjected. from 0.001 to 0.003 mm without significant time 2. The method according to claim 1, characterized in that the expenditure on machining indicates that the melting process is reduced after addition. After a particularly expedient form of machining by machining, the offset is done. ₁₅ process in the process for the machining 3. The method according to claim 1, characterized device used and immediately indicates that it can be carried out along the workpiece with connection to it, by example at the same time Rotating a heat source wise moves a gas flame along that in a lathe-like Clamping device clamped roller 4. The method according to claim 1, characterized in that 20 is moved. According to a further embodiment, indicates that the workpiece can also be arranged within a tubular heat source and, if necessary, find manure in which the coated object is moved upwards. _is moved or left to melt. This 5. Apparatus for carrying out the process measures allow a considerable reduction according to claim I, characterized by a 25 tion of the expenditure on processing machines and Lathe-like clamping device for the production in a single clamping of the Roller (1) and a gas flame (6) or hot air workpiece, with a machining accuracy of source, which is movably arranged along the roller (1) 0.01mm can be achieved. In addition, the Vernet is. drive without employing skilled workers. 6. The device according to Arsprud 5, characterized in that the melting zone A, due to its high profile, is characterized by the fact that a tubular shine is easily recognizable as a hot air source and the data required for processing the gas burner (10), such as feed , Circumferential speed and heat consumption can thus be determined by visual inspection. 35 In the drawing, exemplary embodiments of the Invention shown. It shows Fig. 1 shows an embodiment of the invention The invention relates to a method and a device according to the present invention in an end view,
direction for reducing the surface roughness F i g. FIG. 2 shows a plan view of the device according to FIG of workpieces made of thermoplastic material, 40 Fig. 1, in particular of printing unit rollers with thermo- F i g. 3 another embodiment of the heat plastic jacket surface. source in front view, In the case of friction, cooling and weighting honeycombs for dye F i g. 4 a further embodiment in section, works of printing machines is in practice a F i g. 5 and 6 longitudinal sections through a rubbing extraordinary low surface roughness (max. 45 cylinders before and after the melting process in 0.004 mm) required to increase the scale of the printing inks when coloring. change quickly and cleanly from the surface. I and 2 is the device for to be able to distant. Such distribution cylinders exist position of a cylindrical workpiece 1, preferably usually made of a metallic core and a distribution cylinder, shown schematically. Outer surface made of thermoplastic material in 50 The friction / ylinder is, for example, in three Finished thickness of approx. 0.75 to 1 mm with a jaw chuck 2 of the headstock 3 one not closer Roll diameters from 50 to 300 mm. The type of lathe shown is attached and attached to the tailstock 4 the application of the plastic is stored on the steel core. After over-turning the distribution cylinder 1 however, does not allow the prescribed accuracy of about 1/100 mm with a hard metal tool Dimensions both in terms of the diameter as a turning tool with a cutting depth of 1.5 to 2.5 mm, also in terms of concentricity, so that a speed of 900 rpm and a Machining is required, with the feed rate of 0.114mm / rev in the supports a but only a surface roughness of 14 my can be achieved. Gas burner 6 clamped, the core of the The reduction of the surface roughness to 1 to 4my became flame itself approximately on the outer surface of the Reibzylinbisher made by grinding, with sharp 60 ders located and at a speed of 250 rpm Grinding wheels tend to form a comma while using. a feed rate of 0.3 min / rev truncated grinding wheels. With a single effect, the time is considerably extended and it leads to the formation of surface roughness from 14 my to 6 my, so that for Chatter marks can come. Achieving the required surface roughness of 1 my The object of the invention is now that a repeated operation is required. One can The process of reducing the surface roughness also simplifies this process by adding a second The burner 7, which has been pre-machined by cutting off, is retracted at a distance next to the gas burner 6 as well as to simplify and which is continuously armed for this purpose. Due to the described