Painting hard surface textures pdf
Tests have shown that correspondingly designed thin metal sheets according to the invention have low abrasion in a typical forming process deep-drawing process. The thin metal sheets according to the invention which are designed in this manner are characterised in particular by very low coefficients of friction, a very low and late tendency for what is known as the slip-stick effect, i.
The predominantly closed empty volumes lubricating oil pockets in the thin metal sheet surface according to the invention demonstrated high stability even in the case of high forming forces. The surface texture produced on the flat product, in particular the thin metal sheet according to the invention, defines preferably predominantly closed empty volumes.
In this case, the surface texture is preferably formed so as to be substantially or approximately symmetrical or axially symmetrical. Due to their special characteristic profile, flat products according to the invention can be used particularly for producing components which are to be provided with a layer of paint.
This applies in particular if the flat products according to the invention are produced from steel and in particular are provided with an anti-corrosion coating, for example a zinc coating. Such a steel sheet can be coated for example with a zinc or zinc magnesium coating. However, the criteria specified according to the invention can also apply to flat products which are made of another metal.
Flat products according to the invention are suitable in particular for producing car body parts. The surface texture specified according to the invention is so fine that visually and technically perfect coating results are achieved, even when a paint structure which is considerably simplified by comparison with the prior art is used.
With regard to the roll which is particularly suitable for producing a flat product according to the invention, the above-mentioned object is achieved according to the invention by a roll as defined in claim In addition, in claim 17 , the invention provides a method which allows the reliable production of metal flat products which can be formed better and painted more easily. The invention is based on the knowledge that, taking into consideration the criteria specified according to the invention, a metal flat product can be provided according to plan with such a fine, substantially deterministic surface texture that, after typical automotive painting, it can hardly be visually perceived, if at all.
In particular, the present invention is based on the knowledge that the roll which is particularly suitable for producing a flat product according to the invention can advantageously be textured by means of a short-pulse laser or short-pulse-laser method , in particular an ultra-short-pulse laser.
A suitable short-pulse laser pulse fibre laser has for example a pulse repetition frequency of approximately kHz with a wavelength of approximately nm. The average power of the laser for producing the roll texturing according to the invention lies for example in the range of from 15 to W, preferably in the range of from 20 to 70 W.
The roll can still be ground smooth superfinished and optionally hard-chrome plated after the laser texturing. The surface of the roll is characterised in that the dimples have no substantial raised regions such as occur by comparison in the EDT method. The shorter the laser pulse e. The invention is described in greater detail below with reference to drawings showing a plurality of embodiments, in which:. The surface textures according to the invention having a deterministic distribution of the design features texture features are produced using a roll-texturing method which uses a pulsed laser, preferably a short-pulse or ultra-short-pulse laser, for removing material from the surface of a rotating roll.
For this purpose, the roll 1 to be engraved is rotated in a rotation device. Whilst the roll rapidly rotates, a focusing optics 2 , which focuses the laser beam on the surface of the roll, moves transversely at a relatively low speed in the direction of the roll axis. The laser beam thus depicts a helical path on the roll surface FIG. The material 4 or surface material of the roll 1 consists of free conduction band electrons 5 and positive metal ions 6 FIG. The electrons 5 are accelerated by the electromagnetic field of the laser beam 1 and finally, during the interaction time, transfer their kinetic energy to the metal ions 6.
Said ions are thereby made to vibrate and transfer the vibration energy to adjacent metal ions which are located outside the pure interaction zone between the laser radiation and the material of the roll FIG. In this way, heat is generated in the irradiated roll material 4. By supplying additional laser energy during the pulse time FIG.
Finally, the evaporation temperature is reached, and some of the molten mass 7 evaporates. The metal vapour cloud 8 forming above the molten mass 7 quickly expands, the recoil effect causing an expulsion of the remaining molten mass in the form of molten spatters 9.
The short-pulse laser method is characterised by a relatively large volume of material removed per pulse. By overlapping individual dimples, valley-shaped, connected regions are engraved or produced.
For the deterministic texture variants shown by way of example in FIGS. The interruption of the laser pulses was carried out by means of a fast optical switch, an AOM acousto-optic modulator 10 cf. By rapidly switching the AOM 10 on and off, individual laser pulses were thus either deterministically projected onto the roll surface or deflected onto a cold trap 11 and destroyed there. The laser used for this purpose pulse fibre laser had a maximum average power of W and a pulse repetition frequency of approximately kHz with a wavelength of approximately nm.
The pulse duration should be no more than 1. After passing the AOM 10 , the laser beam 1 was conducted to the focusing optics 2 by means of an optical fibre cable The arrow 13 denotes the direction of movement of the focusing optics 2. The form of the textures was transmitted in an image-processing program provided specifically for this purpose. This program made it possible for the roll speed and the feed speed of the axial axis of the focusing optics 2 to be determined on the basis of the pulse sequence frequency kHz and for the AOM 10 to be controlled such that the density of the dimples and the deterministic distribution thereof were produced according to the texture and design specifications.
The geometry of the individual dimples, which was also specified diameter, depth and flank angle was achieved by optimising the parameters pulse energy and spot diameter, and by a special modulation of the laser beam intensity profile Gaussian profile FIG. Alternatively or in addition to the Gaussian profile, the top-hat profile, which is familiar to a person skilled in the art, can also be used for the modulation.
The laser craters dimples which are produced on the roll surface have a corresponding Gaussian profile. The dimples thus have a steep flank angle. In order to achieve this density, a circumferential speed of 2. In the tracks 2 and 3 , which are oriented substantially parallel to the circumference of the roll, dimples are omitted at the appropriate positions by power modulation of the laser beam by means of an AOM. The modulation of the AOM and also the triggering of the laser pulses have to be synchronised with the moved axes, i.
Additional parameters were:. Flat products were skin-passed with a corresponding roll. A DC 06 IF steel having a thickness of 0. The cold rolled strips were subsequently electrolytically galvanised. Similar tests were also carried out using hot dip galvanised thin metal sheets. With corresponding or similar parameters, the textures shown in FIGS. The surface portion of the surface texture of a roll shown schematically in FIG.
In addition, the double-I-shaped material textures are arranged relative to one another in a chessboard pattern. The lined up, overlapping dimples form open empty volumes on the roll surface. The roll can also be ground smooth and optionally hard-chrome plated after the laser texturing.
The roll surface texture according to FIG. The flat products which are skin-passed by such a roll, in particular thin metal sheets, then have a textured surface which is characterised by a deterministic double-I texture having predominantly closed empty volumes. Studies of thin metal sheets according to the invention which have been produced in this way have shown that said metal sheets have the following functional characteristics by comparison with thin metal sheets from the prior art, in particular those which were produced by means of rolls which were textured by EDT: improved paint appearance, low abrasion during the forming process cf.
In FIG. The measurement curve A relates to a galvanised IF steel thin metal sheet having an oil coating of 1. The abrasion values were determined by strip-drawing tests using flat jaw tools. However, it can also be seen in FIG. In order to characterise the surfaces of the thin metal sheets which are textured according to the invention, in addition to the strip-drawing tests using flat jaw tools, deep-drawing tests were also carried out using a round punch cf.
Other Details: This Finish is a textured paint, which is sprayed to the surface. It is made of inorganic fillers, pure silica quartz, stabilised by an acrylic co polymer. Horizon Inc. Testimonial Download Brochure. Send Email. I agree to the terms and privacy policy. Our Services Exclusive Wall Finishes. Stone Finishes. Premium Paint Finishes. Exclusive Wall Finishes.
We are a leading service provider of Heritage Surface Textures Finishes. Heritage Surface Textures. Granules Wall Texture. Heritage Granite Wall Finish. Silica Duke Texture Paint. Heritage Metallix Granules Wall Finish. Heritage Fine Flakes Finish. Natural Grit Finish. Flakes Wall Finish. Rollercoat Texture Paint. Spraycoat Texture Painting service.
Interested in this product? Get Best Quote. Yes, I am interested! Other Details: It is long lasting wall finish made of silica, coated with inorganic pigments, mixed with acrylic polymer bonding agent, trowel applied with coating thickness of 0.
Other Details: It is highly durable wall finish made of special grade of china clay coated with inorganic pigments with transparent mica chips, mixed with acrylic polymer bonding agent and trowel applied in single coat with coating thickness of 0. It has a natural shimmer and needs only a single coat for even multi color combinations. It is superb if you want something antique effect or the metallic one to adorn your walls with exclusive look.
Other Details: This Finish gives an aesthetic and durable finish as well as offers long-life protection. It is silica granules coated with metallic pigments, applied by a trowel with coating thickness of 0. Last Edit: March 16, , am. Yeah no way of stamping those in with a different material as far as I can tell.
I was looking to do exactly that on a current project. Reply 4 on: March 16, , am. Don't know if you can change it inside of Painter but I know that Painter can export Normal map with transparency. So if you will bake Normal map with Painter then you can save it in your folder with rest maps for later use.
But I personally would suggest use Height maps for detail. You can use them with fill layers with much much greater control. Reply 5 on: March 17, , am. Last Edit: March 17, , am. Carolina Cardoso 0. Quote from: victaa29 on March 07, , am. Reply 6 on: April 20, , pm. The NM stamps are actually containers that can be exported and opened with Bitmap2Material.
From there you can export the maps, and create matching alphas in Photoshop. Which is not very convenient because you need to import the images back into Painter and assign them as Alpha manually, but it works. You do not need to paint the material in manually afterwards.
The NM maps themselves can easily be created using Substance Designer or NDO by blending black and white shapes and converting them to normals automatically. Reply 7 on: April 22, , pm.
Last Edit: April 22, , pm.