Rectifieuse, Rectifieuses pour des pièces rondes
	Koyo Machine Industries Co., Ltd. est représentée en Europe par Crystec Technology Trading GmbH
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Rectifieuses pour des pièces rondes.

Cette page-ci décrit la technologie de rectification sans centre, ainsi que les rectifieuses correspondantes produites par Koyo Machine Industries. Dans les rectifieuses sans centre, un pièce en travail est supporté par une lame de repos et placé entre une roue régulatrice de gomme qui le fait tourner et une meule rotative. Koyo reste le concurrent principal du monde pour la technologie de rectification sans centre avec des machines comme notre système de réglage CNC à 15-axes.

Le principe de rectification sans centre

La rectification sans centre est une procédure de meulage du diamètre extérieur. Différent aux autres procédures cylindriques où le pièce en travail est soutenu dans la rectifieuse entre des centres, dans notre cas le pièce n'est pas contraint pendant le processus d'etre rectifié sans centre. C'est pourqoui dans nos machines, les pièces n'ont pas besoin d'un trou de centrage ni d'un dent d'impulsion ou d'un dispositif de tête de serrage. Au lieu de cela, le pièce en travail est supporté dans la rectifieuse à son diamètre extérieur par une lame de repos et une roue régulatrice. On le fait tourner entre une meule rotative à haute-vitesse et une roue régulatrice d'un diamètre plus petit moins vite.

G: Grinding Wheel - R: Regulating Wheel - B: Blade - W: Work piece

On pose la lame de la rectifieuse normalement à une position qui met le centre du pièce en travail plus haut que la ligne virtuelle entre le centre de la roue régulatrice et celui de la meule rotative. En outre, la lame tient un angle pour assurer que le pièce est fixé entre la lame et la roue régulatrice. La roue régulatrice est fait d'une matière douce come la gomme et peut contenir des matières en grain dur pour obtenir une bonne traction entre le pièce en travail et la roue.

La rondeur

Avec une rectifieuse sans centre on peut atteindre une excellente rondeur du pièce en travail. Par la simultanité de l'usinage et de la suspension de la surface du pièce néanmoins, il est possible que des irrégularités de rondeur se produisent, qui sont typique pour la procédure. L'ajustage minutieux de la machine et de la géométrie de la fente de rectification est essentiel. Quand un point haut entre en contact avec la roue régulatrice, à l'autre coté du pièce en travail, un point bas va être rectifié. Mais ce point bas ne doit pas être exactement en face. La rectifieuse doit être installée de sorte qu'un polygone se forme avec un tel grand nombre de'angles que finalement il sera à peu près rond.

g: grinding wheel - r: regulating wheel - w: work piece - d_g: diameter grinding wheel - d_r: diameter regulating wheel - p: penetration depth - n: polygon order

Grinding Wheels and Dressing

Koyo is using on a large percentage of its grinding machines grinding wheels of cubic boron nitride cBN or diamond wheels. For the series 30 and 45 grinding machines a special dressing and truing system is available as an option: electrical discharge truing E-dt.

Automation

There are mainly two different types of centreless (centerless) grinding:
In-feed grinding
The work piece can have different outer diameters over the length and either only part of the work piece is ground or the total work piece is ground using an adapted grinding wheel.
Thru-feed grinding
Cylindrical work pieces can be ground using this method. The work piece can be longer than the grinding wheel and will still be ground over the full length. It is also possible to grind small work pieces with this method. In this case, several work pieces are ground same time in the machine and high throughput can be achieved.

Advantages of centreless (centerless) Grinding Machines

• By line wise support of the work piece it is possible to grind soft or brittle work pieces (low tension)
• It is not necessary to prepare the work piece for fixing in the grinding machine (faults cause by fixing are eliminated)
• Loading/Unloading of the work piece is simple and easy to automate.
• When using continues through feed grinding there is no time loss for changing the work piece.
• Long work pieces can be handled with rather small machines.
• Very high grinding wheel rotation speed can be achieved.

Main Applications for centreless (centerless) Grinding Machines

Crystec Technology Trading GmbH, www.crystec.com, +49 8671 882173

Koyo centreless (centerless) grinding machines

Koyo is proud of it's diverse line of centreless (centerless) grinding machines. Through mechanical and electrical engineering expertise, Koyo continues to re-examine the essential factors in centreless (centerless) grinding technology in order to improve performance and meet the demands of this ever-changing market. These factors include: precision, efficiency, rigidity, stability, automation, and more. Koyo's on-going attention to automation has resulted in another step forward towards minimal manpower and unstaffed operations.
Koyo has been manufacturing grinding machines for over thirty years and is a world leader in centreless (centerless) grinding technology. Roller and ball bearings are standard on our spindles, while easy maintenance and consistent grinding accuracies continue to bring high levels of customer satisfaction.

30/45/60-Series

C3015F	Grinding machine for high-precision	Model C3015F has a new symmetrical bed structure.  The workrest is located on the bed center and the table feed screw is fixed to the workrest to offer the utmost static and thermal rigidity. The direct-driven grinding wheel spindle motor reduces vibration and energy costs.
C4520FS	Grinding machine with Slanted R.W. slide	Model C4520FS has a fixed workrest for easy part loading & unloading.  The slanted regulating wheel slide offers constant roundness without being affected by  grinding wheel or  regulating wheel wear.
4515C	Economical grinding machine	In Model 4515C, CNC control for the lower slide is standard equipment, as is the rotary traverse-type regulating wheel dresser.  It has a cantilever-type grinding wheel spindle, and the regulating wheel spindle is easily to change.
4515CS	Grinding machine with fixed workrest	In Model 4515CS, the fixed workrest makes it easy to load and unload workpieces. The grinding and regulating wheel slides are movable
4520C	Grinding machine for tough material	In Model 4520C, the regulating wheel housing opens from the top enabling easy wheel change.  It has an upper and lower double slide system for easy, automatic feed as well as size correction by CNC controls.
4520CH	High-speed grinding machine	Grinding wheel peripheral speed of 120m/s.
6015C	Compact grinding machine	Model 6015C is compact to minimize floor space but has a ø610mm grinding wheel. It has a rotary traverse-type regulating wheel dresser, a cantilever-type grinding wheel spindle, and the regulating wheel spindle is easily changed.
6020CAS	Angular grinding machine	The 6020CAS grinder increases productivity because it grinds the O.D. and face of the part simultaneously. Constant roundness is achieved with the slanted regulating wheel slide, and the fixed workrest makes the loading process simple.

Crystec Technology Trading GmbH, www.crystec.com, +49 8671 882173

KC-Series

KC-200	Standard centreless (centerless) grinding machine	Easy maintenance with cartridge grinding wheel spindle
KC-300/400	Dual support grinding machine	- High-rigidity for heavy-duty grinding - High-Precision - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent Grinding Accuracies
KC-300A/400A	Slant-bed grinding machine	- Automatic Setup Change and Easy Operation - High-Precision for Large Diameter Workpieces - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent Grinding Accuracies
KC-500/600	Medium-sized grinding machine	- High-Precision for a Wide Selection of Medium-Sized Workpieces - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent Grinding Accuracies
KC-500A/600A	Medium-sized grinding machine	- Automatic Setup Change and Easy Operation - High-Precision for Medium-Sized Workpieces - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent Grinding Accuracies - Slant Bed
KC-700/800	Grinding machine for long workpieces	- High-Precision - Suitable for Heavy Workpieces up to 805mm Long - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent Grinding Accuracies
KC-700A/800A	Grinding machine for large workpieces	- Automatic Setup Change and Easy Operation - Suitable for Long, Heavy Workpieces - Integrated Structure of Mechanical & Electrical Functions for Labor-Saving Automation - Easy Maintenance & Consistent - Slant Bed
KCL-50	Grinding machine for very small diameter	The KCL-50 is a unique centreless (centerless) machine that can grind the O.D. of Zirconia (ceramic) parts using a thru-feed method. This achieves high accuracy and high productivity while attaining sub-micron (0.1µm Rz) accuracy on very small diameter workpieces.

Crystec Technology Trading GmbH est tout disposé à discuter la suite en détail avec vous.
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