EP2502703A2 - Polishing device with rotary feed-through - Google Patents

Abstract

The polishing device (1) has a tiltable base portion (2) made of metal, plastic or ceramic for directly or indirectly receiving a polishing plate (3). A rotary feedthrough (5) is provided, by which the polishing agent is supplied into a polishing agent channel (2.1) of the base portion. The rotary feedthrough is arranged directly or indirectly on a spindle shaft (4.1) and the base part is tiltable corresponding to the rotary feedthrough. The rotary feedthrough is formed in flow connection with the base portion through a flexible fluid connection (5.1). An independent claim is included for a method for zonal polishing of aspherical, non-rotationally symmetrical lenses.

Description

The invention relates to a polishing apparatus for zonal polishing of optical lenses with a tiltable base part for central or immediate recording of a polishing plate, wherein the base part for driving with a rotatably mounted in a spindle housing spindle axis of a polishing spindle is rotatably connected and a rotary feedthrough is provided , By means of which the supply of polishing agent is ensured in a polishing agent channel of the base part.

Furthermore, the invention relates to a polishing apparatus for polishing optical lenses with a tiltable, solid base part for central or immediate recording or clip recording a polishing plate, wherein the base part for receiving on a ball head of a polishing spindle has a cap and the base part for the purpose of rotary drive is coupled via a connecting part with a pivot axis D having a polishing spindle or at least coupled. To ensure clip pickup, non-rigid materials such as rubber are eliminated from the base.

The invention also relates to a method for zonal polishing of aspherical, non-rotationally symmetrical lenses using a polishing plate tilted by a polishing spindle.

In the production of aspherical or non-rotationally symmetric lenses, such as lenses with a toric surface or free-form surfaces, tools or polishing heads which are smaller than the surface of the lens to be processed, so-called zonal polishing tools, are generally used.

In zonal machining, the tool or the polishing head is guided over the surface, wherein on the areas of the surface to be machined of the lens, which are not covered by the tool, polishing agent is applied, which then between the polishing tool and the surface to be processed of the lens is incorporated, whereby the polishing performance is improved. In order to adapt the polishing head to the shape of the surface to be machined this is tiltably mounted on a ball joint. Furthermore, the polishing head has an elastic support layer for the polishing film, so that a local deformation of the polishing head to adapt to the shape of the lens is possible.

Such a polishing tool is from the DE 10 2004 062 319 B3 known. It describes a polishing apparatus for optical lenses with a rotation axis X having a receptacle for placement on a polishing machine and arranged on the receptacle cuff for rotatably driving a arranged on the sleeve tool holder or polishing head, wherein the tool holder via a coaxially mounted in the receptacle and in the direction of the axis of rotation X displaceable guide piston is guided tiltably.

Further, a polishing apparatus for polishing optical lenses is made of DE 10 2008 061 267 A1 known. The polishing apparatus has a tiltable base part for directly or indirectly receiving a polishing plate, wherein the base part is connected to a polishing spindle for rotary drive and a rotary feedthrough is provided for the supply of polishing agent, which is arranged with respect to the base part at least partially opposite to the polishing spindle. The rotary union is supplied externally by means of a hose connection via a stationary polishing agent supply supplied, wherein the hoses are attached to the non-rotating part of the rotary feedthrough, but which also tilts during the process.

From the DE 10 2009 036 981 A1 a polishing device for polishing optical lenses with a tiltable base part for central or immediate recording of a polishing plate is known, wherein the base part for receiving on a ball head of a polishing spindle has a dome and coupled the base part for the purpose of rotary drive via a connecting part with a spindle shaft of a polishing spindle is, wherein the dome formed as a separate bearing part and arranged in the base part.

The invention has for its object to provide a polishing device for the zonal machining of non-rotationally symmetric surfaces, which has improved polishing properties in terms of mobility and longevity.

The object is achieved according to the invention by the features of claims 1, 5 or 8.

With the arrangement of the rotary feedthrough on the spindle housing, the coupling of the hose connection to the rotary feedthrough from the outside, that is to say a stationary hose connection to the tilting and rotating base part during the polishing process on the ball head, is prevented. According to the invention, only one hose connection connected to the likewise rotating part of the rotary feedthrough is necessary. The hose connection rotates with the spindle and the rotating part of the rotary feedthrough. Since only the flexible hose connection is coupled to the base part, the base part is only slightly influenced in its tilting movement. The mobility of the Base part on the ball head for the purpose of adaptation to the predetermined by the rotating workpiece position is significantly improved.

These advantages are also achieved by the method according to the invention. During polishing, polishing agent is fed from the outside via a rotary feedthrough stationarily arranged on the spindle shaft. Via a flexible fluid connection, the polishing agent is guided from the rotary feedthrough to the base part and to the polishing plate arranged thereon.

Likewise, the use of a separate bearing part or a separate calotte made of a different material allows an even better mobility on the ball head and thus the overall improved by the inventive rotary feedthrough mobility of the base part. This especially against the background of the use of different materials. The material for the bearing part can thus be selected solely according to its sliding properties, regardless of the desired material properties for the base part. The latter is in direct contact with the very abrasive polishing suspension and is also claimed cyclically in the field of recording geometry by the up and Abklippsen the polishing plate. An increased wear resistance is thus ensured with the free choice of material.

The applicable for the bearing part slidable material can be sufficiently large elasticity and a simple assembly when placed on or removal from the ball to. With increased elasticity, an improved widening of the dome during insertion or removal of the ball head is ensured.

It may be advantageous for this purpose, if the base part is formed with the bearing part or the cap as a composite part, wherein the bearing part is integrated into the base part or at least integratable. In a composite part can be favorable material pairings for the base part on the one hand and the dome or the bearing part on the other hand form. The material of the bearing part can be selected according to the optimal sliding movements on the ball head, while the base part on the one hand and the aggressive polish on the other hand can be made wear-resistant on the other hand with respect to the continuous polishing plate change.

In principle, a further connecting element between the bearing part and the base part can be provided for the purpose of training as a composite part. In this case, the bearing part and the base part could be formed of the same material. In principle, only different material properties, such as, for example, variously cross-linked plastics or variously hardened metals, are necessary in order to form a composite material.

Furthermore, it can be advantageous for this purpose if at least one of the materials metal, plastic or ceramic is used for the base part and for the bearing part, so that material combinations with the desired properties are possible. Assuming the use of materials for the base and bearing assembly with different mechanical properties, different material combinations are provided as a composite material. Plastic such as Teflon offers very good sliding properties, while ceramic and metal are very wear-resistant. The latter ensures a longevity of the base part, which is subject to numerous cycles of Aufklippsbaren polishing head. The dimensional stability of the base part is ensured when using ceramic or metal.

It can also be advantageous in terms of increased mobility if the fluid connection has a first connection to the base part and a second connection to the rotary feedthrough, wherein the first connection is offset relative to the second connection with respect to a circumferential direction of the spindle shaft. Thus, the fluid connection can be formed sufficiently long so that, taking into account the available flexibility of the fluid connection as little influence as possible on the tilting movement of the base part and the polishing head.

For this purpose, it is advantageous if the first connection is arranged with respect to the circumferential direction of the spindle shaft opposite to the second connection. Thus, both ports are at maximum distance from each other, whereby a maximum length of the fluid connection is ensured. Distances between the terminals in the axial direction are neglected in this consideration.

Alternatively, it may be advantageous if at least two fluid connections are provided, each with a connection, wherein the connections are arranged with respect to the circumferential direction of the spindle shaft symmetrically distributed on the base part. With the symmetrical connection, the resulting influences on the tilting movement of the base part are also symmetrical or balanced, so that an optimum polishing result is achieved.

Further advantages and details of the invention are explained in the patent claims and in the description and in the FIGS. 1 and 2 shown.

An in Fig. 1 shown polishing device 1 consists of a polishing spindle 4 with a about an axis of rotation D in the circumferential direction U rotatable spindle shaft 4.1, at the front end of a base part 2 is provided with a releasably aufgeklippsten polishing plate 3. The base part 2 is connected via a trained as a bellows 4.4 connecting part in rotary connection with the spindle shaft 4.1.

The polishing spindle 4 has a coaxially to the axis of rotation D mounted piston 4.5, at the end-face end of a ball head 4.2 is provided as part of a ball joint for tilting receiving the base part 2. The piston 4.5 is axially movable in the direction of a translation axis T and is guided for this purpose via a cylinder 4.6.

The spindle shaft 4.1 carries a rotary feedthrough 5 for polishing agent, which is in flow connection via a second connection 5.6 and a fluid connection 5.1 with a first connection 2.3 of the base part 2 and a subsequent polishing agent channel 2.1. The two connections 2.3, 5.6 lie on opposite sides of the base part or the spindle, so that the flexibility of the fluid connection 5.1 designed as a tube is utilized. The rotary feedthrough 5 is essentially formed from a base body 5.2 with an annular channel 5.3, which rotates with the spindle shaft 4.1. On the base body 5.2 seated relative to the base body 5.2 rotatable rotary ring 5.4, which is supplied via a stationary feed line 5.5 with polishing agent. The rotary ring 5.4 does not complete the rotational movement of the spindle shaft 4.1.

The main body 5.2 is connected via the flexible fluid connection 5.1 with the polishing medium channel 2.1 of the base part 2. Thus, that is for such a zonal polishing tool necessary tilting movement almost unaffected. Only the flexible fluid connection 5.1 could justify an influence.

In order to ensure a possible lossless tilting movement, the base part 2 is formed as a composite part. For this purpose, the base part 2 a formed of plastic dome 2.2 as a further part of the ball joint for receiving the ball head 4.2. The cap 2.2 is fixed inside the base part 2 formed of aluminum.

The base part 2 formed from aluminum is therefore sufficiently wear-resistant against the background of the very aggressive polishing agent on the one hand and the multiple polishing plate change on the other hand.

To Fig. 2 a second fluid connection 5.1 'is provided. The fluid connection 5.1, 5.1 'has a meandering line part 5.1a, 5.1a' increased flexibility, wherein the respective port 2.3, 2.3 ', 5.6, 5.6' on the same side of the base part 2 and the spindle shaft 4.1 is arranged. The forces of the fluid connection 5.1, 5.1 'acting on the base part 2 via the first connection 2.3, 2.3' are thus equalized with respect to the tilting movement of the base part 2.

LIST OF REFERENCE NUMBERS

1

polisher

2

base

2.1

Polish channel

2.2

Calotte, bearing part

2.3

first connection

2.3 '

first connection

3

polishing plate

4

polishing spindle

4.1

spindle shaft

4.2

Ball head, ball joint

4.4

Connecting part, bellows

4.5

piston

4.6

cylinder

5

Rotary union

5.1

fluid communication

5.1 '

fluid communication

5.1a

Meander-shaped line part

5.1a '

Meander-shaped line part

5.2

body

5.3

annular channel

5.4

rotating ring

5.5

feed

5.6

second connection

5.6 '

second connection

D

axis of rotation

T

translation axis

U

circumferentially

Claims (8)

Polishing device (1) for zonal polishing of optical lenses with a tiltable base part (2) for central or direct reception of a polishing plate (3), the base part (2) being driven by a rotatably mounted spindle shaft (4.1) of a polishing spindle (4) is rotatably driven drivable and a rotary feedthrough (5) is provided, by means of which the supply of polishing agent in a polishing medium channel (2.1) of the base part (2) is gewährleitst,
characterized,
that the rotary lead-through (5) directly or indirectly to the spindle shaft (4.1) and the base part (2) (5) is tiltable relative to the rotary lead-through, wherein the rotary lead-through (5) via a flexible fluid connection (5.1) (with the base part 2) is in flow connection. Polishing device (1) according to claim 1,
characterized,
in that the fluid connection (5.1) has a first connection (2.3) on the base part (2) and a second connection (5.6) on the rotary feedthrough (5), the first connection (2.3) being relative to the second connection (5.6) with reference to a Circumferential direction U of the spindle shaft (4.1) is arranged offset. Polishing device (1) according to claim 2,
characterized,
that the first port (2.3) with respect to the circumferential direction of the spindle shaft (4.1) opposite the second terminal (5.6) is arranged. Polishing device (1) according to claim 1, 2 or 3
characterized,
in that at least two fluid connections (5.1, 5.1 ') each having a connection (2.3, 2.3') are provided on the base part (2), the connections (2.3, 2.3 ') being distributed symmetrically with respect to the circumferential direction U of the spindle shaft (4.1) on the base part (2) are arranged. Polishing device (1) for polishing optical lenses with a tiltable base part (2) for the middle or immediate reception of a polishing plate (3), wherein the base part (2) for receiving on a ball head (4.2) of a polishing spindle (4) a dome ( 2.2) and the base part (2) for the purpose of rotational drive via a connecting part (4.4) with a spindle shaft (4.1) of a polishing spindle (4) is coupled, wherein the dome formed as a separate bearing part (2.2) and arranged in the base part (2) is
characterized,
that the bearing part (2.2) is formed of a different material than the base part (2). Polishing device (1) according to claim 5,
characterized,
that the base part (2) is formed with the bearing part (2.2) as a composite material part, the bearing part (2.2) in the base part (2) integrated or at least integrated. Polishing device (1) according to claim 5 or 6,
characterized,
in that at least one of the materials metal, plastic or ceramic is used for the base part (2) and for the bearing part (2.2). Method for zonal polishing of aspherical, non-rotationally symmetrical lenses using a polishing plate (3) tiltably guided on a spindle shaft (4.1) of a polishing spindle (4),
characterized,
that during polishing, polishing agent is supplied via a rotary feedthrough (3) arranged stationarily on the spindle shaft (4.1) and guided to the polishing plate (3) via a fluid connection (5.1).

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