DE102004002568B3 - Tool for polishing rotationally symmetrical surfaces, especially with non machinable regions useful for polishing metal surfaces - Google Patents

Abstract

Tool for polishing rotationally symmetrical surfaces, especially with non machinable regions in the center or free formed surfaces with a rubber membrane or a plunger (4) with a polishing film (1) fixed to it, especially a polyurethane film, where the film is fixed to rubber carrier (2) and the rear side of the carrier and also the plunger have openings on the side opposite (sic) the carrier, and the carrier and piston are connected by a pin (3). An independent claim is included for a method of producing the tool as described above.

Description

The The invention relates to a tool for polishing rotationally symmetric Workpieces, especially with non-editable areas in the center, or Free-form surfaces with a rubber membrane or a ram with a polishing surface attached to it or film, in particular of polyurethane, as well as a method for the production such a tool.

The Invention is preferably used for processing aspherical workpieces or free-form surfaces with optically active surfaces, especially lenses or mirrors that are not in their midst have machinable zones, such as conical elevations.

The Production of aspheres takes place in two steps, first by grinding or turning to produce the mold and then by Polishing to achieve the required surface finish.

To the Polishing is a rotating tool in the prior art a likewise rotating workpiece moves, wherein the tool from a rubber membrane or a pestle with a glued on Polyurethane membrane, the so-called polishing film consists. The foil lies flat on and is pressed by compressed air. The removal on the workpiece is achieved both by the film, as well as by a constantly supplied liquid. The membrane or the plunger becomes by means of a CNC program always perpendicular to the to be polished area placed and slowly guided on a radius over the workpiece. About the Choice of the speed gradient on the diagonal becomes the removal controlled to the desired Shape of the workpiece to achieve.

specially in the case that there is an elevation in the middle of the workpiece, can only use a pestle the diameter of the polishing foil used, since the rubber membrane needed a bracket, which collided with the survey.

Of the generally known ram has the disadvantage that when consumption of the polishing foil of the plunger the compressed air is pressed directly onto the workpiece and thereby its surface can damage. Furthermore must be the regular used foil to be replaced. The replacement of the old one is at one Bonding difficult, adjusting the new also requires Exercise and time.

In Diamond turning, in particular, are air-spindle turning machines used in which by means of diamonds an accurate, optically usable Shape and area be achieved.

Therefore However, here limits arise in reducing the surface roughness. Furthermore, the costs for the production both by the high purchase price of the machines as well as the running costs due to the price of the diamonds and their pre-processing very high.

Lots Materials like most glasses can so far not to be processed in rotation.

Of the Invention is based on the object, a tool and a method to provide for its production, with which a simple, inexpensive, fast, comprehensive and accurate polishing of rotationally symmetric Workpieces, especially those with non-editable areas in the center, or free-form surfaces possible is.

According to the invention Task with an arrangement which in the claims 1 or 7 features specified, and a method which has the features specified in claim 8 contains solved.

advantageous Embodiments are specified in the respective subclaims.

Pestle up the carrier facing side each have a hole and the carrier and the ram through connected on either side in each one of the two holes introduced pin are. This can speed up the tool change and it can With minimal material costs as many tools as possible getting produced. A reuse of the rubber carrier is not technically necessary.

is the polishing surface on the carrier glued, so can the full surface of the rubber carrier without supernatant be used, whereby the entire optical effective area of a Workpiece in certain circumstances up to an inner cone, can be edited.

Thereby, that the pin is pressed into the ram or screwed in, the pen is easily stable attached and yet the rubber carrier quickly interchangeable.

Consists the polishing surface when processing metal workpieces depending on the fineness of glass fiber mats with super glue or polyurethane or leather, is one inexpensive and very accurate editing possible.

By A breaking point in the pen can cause major damage in the event of an accident be avoided.

has the tool on the plunger a Stop on the contact of the plunger with the polished area prevents the workpiece can also at an unfavorable running damage not damaged become.

Becomes the manufacturing process for the polishing tool is performed in parallel to a polishing process, be Time and costs saved.

The Invention will be explained in more detail below with reference to an embodiment.

To shows

1 an inventive polishing tool in cross section.

1 shows a polishing tool. The polishing foil 1 was on a rubber strap 2 Applied and in the back of the carrier 2 a hole drilled. In the pestle 4 that with the tool shank 5 connected, a hole was drilled and in this a pin 3 preferably pressed. The pin could also be screwed or otherwise secured. On this pin is the with the polishing foil 1 provided carriers 2 plugged. The polishing foil 1 can thus parallel to the polishing process on the rubber carrier 2 glued and then replaced if necessary together with this.

The pencil 3 is made of plastic, but can also be made of metal or other, correspondingly stable materials. To secure for cases of excessive stress points the pen 3 a breaking point on while the movement of the plunger 4 is limited by a stop in the direction of the surface to be polished. In case of an accident, so the carrier can 2 from the pestle 4 solve without the workpiece to great pressure or direct contact with the plunger 4 is suspended.

at metallic workpieces there is the polishing surface dependent on of the required fineness of polishing, preferably of glass fiber mats with superglue, polyurethane or leather.

in the Trap of fiberglass mats, several of these layers are stacked arranged with superglue located between the layers and preferably compressed under pressure.

Instead of Glass fiber mats with superglue is also another flexible Fabric made of hard fibers used.

1

polishing film

2

rubber support

3

pen

4

tappet

5

shaft

Claims (10)

Tool for polishing rotationally symmetrical workpieces, in particular with non-machinable areas in the center, or free-form surfaces with a rubber membrane or a plunger ( 4 ) with a polishing foil attached thereto ( 1 ), in particular of polyurethane, characterized in that the polishing film ( 1 ) on a rubber carrier ( 2 ) and both the back of the carrier ( 2 ) as well as the plunger ( 4 ) on the support ( 2 ) facing side each having a hole, wherein the carrier ( 2 ) and the plunger ( 4 ) by a pin placed on either side in each of the two holes ( 3 ) are connected. Tool according to claim 1, characterized in that the polishing foil ( 1 ) on the carrier ( 2 ) is glued. Tool according to claim 1 or 2, characterized in that the pin ( 3 ) in the ram ( 4 ) is pressed or screwed. Tool according to one of claims 1 to 3, characterized in that the polishing film ( 1 ) for processing metallic workpieces, depending on the fineness of glass fiber mats with superglue or leather. Tool according to one of claims 1 to 4, characterized in that the pin ( 3 ) has a predetermined breaking point. Tool according to one of claims 1 to 5, characterized in that the tool on the plunger ( 4 ) has a stop which prevents the contact of the plunger with the surface to be polished. Polishing tool with a rubber membrane or a plunger ( 4 ) with a polishing foil attached thereto ( 1 ), characterized in that the polishing film ( 1 ) for machining metallic workpieces, depending on the fineness of glass fiber mats with super glue or polyurethane or leather. Method for producing a tool for polishing rotationally symmetrical workpieces The mold according to any one of claims 1 to 7, wherein the tool consists of a rubber membrane or a plunger ( 4 ) with a polishing foil attached thereto ( 1 ), in particular of polyurethane, by the polishing foil ( 1 ) on a rubber carrier ( 2 ) and both in the back of the carrier ( 2 ) as well as in the ram ( 4 ) on the support ( 2 ) side facing a hole is drilled, and a pin ( 3 ) on the one hand into the hole in the ram ( 4 ) and on the other hand into the hole in the carrier ( 2 ) is introduced. Method according to claim 8, characterized in that the polishing foil ( 1 ) on the carrier ( 2 ) is glued. Method according to claim 8 or 9, characterized in that the pin ( 3 ) in the ram ( 4 ) is pressed or screwed.