Method for processing and producing a surface with a degree of lustre
View Patent ↗The invention relates to a method for processing and producing a surface of a material with a reproducible degree of lustre and to a press for carrying out said method. The aim of the invention is to increase the stability of the press. To achieve this, a press is provided with a coating that consists of carbon with diamond-like layers and that adheres to the surface of the press. Said coating has a layer thickness of between 0.1 and 10 μm and a surface hardness in excess of 1800 HV (Vickers). The attrition of the surface of the press is thus significantly reduced during the processing of abrasion-resistant materials.
1. A method for producing an embossing on a surface of a workpiece, the method comprising the step of pressing a flowable surface material together with the workpiece using a pressing tool, the pressing tool having a having a coating of diamond-like carbon layers disposed on a pressing tool surface, the coating having a Vickers surface hardness greater than 1,800 HV.
2. The method according to claim 1 , wherein the flowable surface material comprises a material to which corundum has been added to produce a surface that is highly resistant to friction wear, and wherein the flowable surface material has a surface hardness below that of the coating.
3. The method according to claim 1 , further comprising the step of forming a smooth or structured surface on the workpiece by means of plastification, shaping and solidification.
4. The method according to claim 1 , wherein the workpiece comprises a single layer or multi-layer material and the flowable surface material comprises a plastic material or an overlay paper.
5. The method according to claim 4 further comprising the step of heating the pressing tool in a low temperature range, the low temperature range being below the recrystallization temperature of the pressing tool materials and up to the melting point of the plastic material or overlay paper.
6. The method according to claim 1 , wherein the surface of the workpiece comprises a large-format flat surface.
7. The method according to claim 1 , wherein the flowable surface material comprises a duroplastic material.
8. A pressing tool for producing an embossing on a surface of a workpiece by pressing a flowable surface material together with the workpiece, said pressing tool comprising a pressing sheet, an endless belt or a pressing roller and having a firmly adhering hardened coating of diamond-like carbon layers disposed on a pressing tool surface, said coating having a layer thickness of 0.1 to 10 μm and a Vickers surface hardness greater than 1,800 HV.
9. The pressing tool according to claim 8 , wherein said coating comprises amorphous carbon.
10. The pressing tool according to claim 8 , wherein said pressing tool surface comprises a smooth surface.
11. The pressing tool according to claim 8 , wherein said pressing tool surface comprises a structured surface.
12. The pressing tool according to claim 8 , wherein said pressing tool comprises a steel material.
13. The pressing tool according to claim 12 , wherein said steel material comprises a stainless steel material.
14. The pressing tool according to claim 8 , wherein said pressing tool comprises a brass material.
15. The pressing tool according to claim 8 , wherein said pressing tool surface is etched with a noble gas using a cathode atomization process before applying said coating of diamond-like carbon layers.
16. The pressing tool according to claim 8 , further comprising an intermediate layer of chrome disposed between said pressing tool surface and said coating of diamond-like carbon layers.
17. The pressing tool according to claim 8 , further comprising an intermediate layer of silcon, silicon dioxide or titanum oxicarbide disposed between said pressing tool surface and said coating of diamond-like carbon layers.
18. The pressing tool according to claim 8 , further comprising an intermediate layer of titanium nitrite disposed between said pressing tool surface and said coating of diamond-like carbon layers, said titanium nitrite being deposited in a high vacuum using a plasma arc.
19. The pressing tool according to claim 8 , wherein said coating of diamond-like carbon layers is applied using a plasma-activated deposition process from a gas phase (chemical vapor deposition) at a low temperature below 200° C. in a high vacuum.