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Tecnologías de pulido de piedras facetadas de cristal

Resumen

Tipo:
Demanda Tecnológica
Referencia:
TRAT20151104001
Publicado:
23/11/2015
Caducidad:
22/11/2016
Resumen:
Un fabricante austríaco de bienes de consumo está interesado en mejorar o sustituir su proceso actual de pulido triboquímico por un nuevo proceso de fabricación estable. El proceso debe garantizar un pulido de alta calidad de piedras facetadas de cristal, con bajos costes de producción y tiempo rápido de ejecución para un alto volumen de piedras. Las piedras tienen un diámetro entre 1 y 25 mm, con aproximadamente 12 facetas por piedra. El fabricante está abierto a distintos tipos de acuerdos: licencia, cooperación técnica y/o financiación.

Details

Tittle:
Polishing technologies sought for glass faceted stones
Summary:
An Austrian manufacturer of consumer goods is seeking to improve or substitute their existing tribochemical polishing process with a new stable manufacturing process. The process should ensure a high-quality polish of small faceted glass stones with low production costs and a fast execution time for a high volume of stones. The manufacturer is open to a variety of partnerships including licensing, technical cooperation and/or financial agreements.
Description:
The Austrian company has significant experience and expertise in glass surface polishing and seeks to improve the manufacturing process in terms of polishing speed, surface quality (planeness and roughness) and polishing time.

The current process for polishing faceted glass surfaces of the Austrian manufacturer is tribochemical planarization utilizing the combination of chemical and mechanical forces, i.e. an interaction of both the surface of the faceted glass stones and the polishing material with water, as well as significant friction / mechanical pressure. The optimal polishing material currently in use is Cerium Oxide due to its strong grip and ability to polish glass using both chemical and mechanical forces simultaneously.
The polishing substrates are faceted glass stones ranging from 1mm to 25mm in diameter, with ~ 12 facets per stone. The facet sizes range from 1mm2 to 100mm2, at times up to 50mm x 50mm. The company defines high-quality as resultant smooth surface topography, maintained faceted edges, transparent optical shine without hindering brilliance (light return, fire, and scintillation), and no visible scratches.

The polishing process follows separate Rough and Fine Grinding process steps as shown:
Forming-> Rough Grinding-> Fine Grinding-> Polishing
Following Fine Grinding, surface roughness is in the range from 2 to 7 -Y-micro;m Rt (i.e. the depth range of resulting surface irregularities / defects / scratches). The Polishing step initially smooths the rugged peaks and surface irregularities using primarily mechanical force. A coolant (water) is then applied to the glass surface loosening the glass surface to allow the chemical absorption and decomposition induced by the polishing material to take effect. The polishing grains are then flattened by tangential shear abrasion between the polishing disc and glass surface, exploiting the chemical bond between the glass surface and the polishing grain, conclusively allowing the removal of the top layer of the glass surface at a removal rate of >1-Y-micro;m/s.

The manufacturer is looking for an improvement or alternative to the current manufacturing process. The company is open to cooperating with partners in developing a suitable solution or in purchasing the licence for an existing solution. In addition, a financial agreement is also possible. If the technical fit is right, the company would also be willing to discuss other forms of cooperation. All kinds of partners will be considered.
Technical Specification or Expertise Sought:
The company is seeking a solution, which meets the following requirements:
1. Polishing Speed: Polishing removal rate after the elimination of rough surface of glass material should be >1-Y-micro;m/s @ 1 N/mm².
2. Surface Quality / Planeness: Plane facets should be < 1-Y-micro;m per mm length of facet (for small facets, 2mm x 1mm); faceted edges must be maintained.
3. Surface Quality / Roughness: should be < 5nm Rq (i.e. standard deviation of surface roughness after polishing), no visible polishing direction, scratch or markings.
4. Polishing Time: should be < 5 seconds for facets up to 100mm².

Current process parameters include variations in polishing pressure, relative velocity (speed), accurate stone positioning, traversing movement, and polishing material (composition; chemical / physical properties, including but not limited to hardness; grain composition and size; polish concentration and structure), however the client is also seeking solutions which focus on an entirely new process rather than parameter variations.

Partner sought

Type and Role of Partner Sought:
- Type of partner sought: Chemical / Material / Manufacturing Expert

- Specific area of activity of the partner: Polishing

- Task to be performed by the partner sought: Solution / Technology Provider

Client

Type and Size of Client:
Industry >500 MNE
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
English
German