Vibration polishing device

Abstract

The present disclosure relates to a vibration polishing device, comprising: a vibration drive for generating an oscillating vibration for polishing samples; polishing disc which is connected to and can be driven by the vibration drive; and polishing bowl which is designed to receive a polishing medium and the samples to be polished and is coupled to the polishing disc; wherein the coupling between the polishing bowl and the polishing disc is accomplished by a quick-type coupling for transferring the oscillating vibrations from the polishing disc to the polishing bowl when the vibration polishing device is in operation and thereby to move the sample to be polished in the polishing bowl.

Claims

1. A vibration polishing device, comprising: a vibration drive for generating an oscillating vibration for polishing samples; a polishing disc which is connected to and can be driven by the vibration drive; a polishing bowl which is designed to receive a polishing medium and the samples to be polished and is coupled to the polishing disc for being entrained therewith, and wherein the polishing bowl is releasably attached to the polishing disc by both a magnetic adhesion force and horizontally or laterally interlocking form-fitting engagement portions located between the polishing disc and the polishing bowl which cause at least one of i) centering or ii) horizontal or lateral form-fitting interlocking coupling of the polishing bowl to the polishing disc and thus contribute to entrainment of the polishing bowl in oscillatory vibration movement of the polishing disc.

2. The vibration polishing device of claim 1, wherein the polishing disc has a first ferromagnetic part on its upper side and the polishing bowl is equipped with a second ferromagnetic part on its underside, and wherein the first and second ferromagnetic parts cooperate to provide adhesion of the polishing bowl to the polishing disc.

3. The vibration polishing device of claim 2, wherein one of the ferromagnetic parts is a ferromagnetic layer in the form of a magnetic plate or magnetic foil, and the other ferromagnetic part is a ferromagnetic layer in the form of a ferrometal disc or magnetic foil disc.

4. The vibration polishing device of claim 3, wherein the magnetic plate or magnetic foil is glued to the upper side of the polishing disc or to the underside of the polishing bowl.

5. The vibration polishing device of claim 3, wherein the ferrometal disc or magnetic foil disc is glued to the underside of the polishing bowl or to the upper side of the polishing disc.

6. The vibration polishing device of claim 1, comprising centering and indexing means arranged between the polishing disc and the polishing bowl.

7. The vibration polishing device of claim 1, wherein the polishing medium comprises a carrier material and a polishing agent.

8. The vibration polishing device of claim 7, wherein the carrier material is a polishing cloth and the polishing agent is provided as a polishing agent suspension.

9. The vibration polishing device of claim 8, wherein the polishing bowl is in the form of a plastic container for the carrier material and the polishing agent suspension and can be closed with a lid and has a carrying handle for being placed on the polishing disc and lifted from the polishing disc as a whole.

10. The vibration polishing device of claim 7, wherein the polishing bowl has a base wall with a receiving space for the carrier material and a circumferential lateral wall with a spline groove for receiving a rubber-elastic ring to cover and sealingly engage on the edge of the carrier material.

11. The vibration polishing device of claim 1, wherein an edge gap is provided between the polishing bowl and the polishing disc, into which a tool is engageable to gently lift the polishing bowl from the polishing disc.

12. The vibration polishing device of claim 1, wherein the vibration drive comprises a vibration plate to which the polishing disc is mounted and which is capable of executing rotational oscillations around a central axis.

13. The vibration polishing device of claim 12, wherein in addition to the vibration plate, the vibration drive furthermore comprises an annular base part and an annular counter-oscillating part which extend around the central axis and are coupled by first leaf springs that extend according to helical surfaces, so that mutually oppositely oscillating rotational oscillatory movements are possible between the base part and the counter-oscillating part.

14. The vibration polishing device of claim 13, wherein the vibration plate is coupled to the base part by second leaf springs which extend radially and around the central axis according to helical surfaces, and further comprising an electromagnetic drive comprising a first drive part on the counter-oscillating part and a second drive part on the vibration plate for producing, during operation, oppositely oscillating rotational oscillatory movements between the counter-oscillating part and the vibration plate.

15. The vibration polishing device of claim 14, further comprising a control unit controlling the first and second drive parts in opposite directions and for balancing disturbing forces.

16. The vibration polishing device of claim 15, wherein the vibration drive, the polishing disc, and the polishing bowl form a first unit which is arranged in a protective housing next to the control unit which forms a second unit.

17. The vibration polishing device of claim 16, wherein the protective housing has an overall wedge-like shape with a truncated wedge tip which accommodates the control unit that includes a control panel outside the protective housing.

18. The vibration polishing device of claim 1, wherein the interlocking form-fitting engagement portions comprise at least one head bolt in the polishing disc or the polishing bowl and at least one corresponding engagement opening in the other of the polishing disc or the polishing bowl.

19. The vibration polishing device of claim 1, wherein the interlocking form-fitting engagement portions comprise a centering disc in the polishing disc or the polishing bowl and a corresponding central recess in the other of the polishing disc or the polishing bowl.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) An exemplary embodiment will now be described with reference to the drawings, wherein:

(2) FIG. 1 shows a schematic longitudinal sectional view through a vibration polishing device;

(3) FIG. 2 shows a schematic cross-sectional view through the vibration device;

(4) FIG. 3 shows an enlarged detail of FIG. 2;

(5) FIG. 4 shows a partially sectional side view of a vibration drive;

(6) FIG. 5 is a perspective view from above of a polishing bowl;

(7) FIG. 6 is a perspective view from below of a polishing bowl;

(8) FIG. 7 is a perspective view from above of a lid for the polishing bowl;

(9) FIG. 8 is a perspective view of a vibration drive from below, with a polishing bowl placed thereon;

(10) FIG. 9 is a sectional view of a sample holder; and

(11) FIG. 10 is an overall perspective view of a vibration polishing device.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(12) The main parts of the vibration polishing device include a vibration drive 1, a polishing disc 2, and a polishing bowl 3. In addition, the device also comprises a control unit 4 and a protective housing. 5

(13) The electromotive vibration drive 1 (FIG. 4) comprises an annular or disc-shaped base part 11, an annular or disc-shaped counter-oscillating part 12, a vibration plate 13, and an electromotive drive with a first drive part 14 and a second drive part 15. The base part 11 is coupled to the counter-oscillating part 12 by first leaf springs 16. Furthermore, the base part 11 is coupled to the vibration plate 13 by second leaf springs 17. Each of leaf springs 16 and 17 form three spring packs which are arranged in distributed manner around the circumference of the device. A central axis or axis of symmetry 10 can be associated with the vibration drive 1, and the leaf springs 16 and 17 form very steep helical surfaces relative to this axis, like thread sections of a multi-thread screw, which extend radially to the central axis 10 and at an inclination angle of 18 relative to the central axis 10. The structure of vibration drive 1 has been described in detail in DE 10 2004 034 481 B4 or U.S. Pat. No. 7,143,891 B2, to which reference is hereby made and which are hereby incorporated by reference into the subject matter of the present disclosure.

(14) As shown in FIGS. 1 and 2, the polishing disc 2 is firmly connected to the vibration drive 1, namely by being screwed to the vibration plate 13 at 24 and indexed at 25. On its upper side, the polishing disc 2 has a magnetic plate or a magnetic sheet 21 (FIG. 3), as a first ferromagnetic layer, which is secured on the upper side of the polishing disc 2, in the present example glued thereto. Head bolts 23 which engage in engagement openings 33 of the polishing bowl 3 can be regarded as form-fitting engagement portions of a quick-type coupling.

(15) The polishing bowl 3, preferably made of plastics, is coupled with the polishing disc 2 for being entrained therewith, and for this purpose it has a magnetic foil sheet or sheet steel disc 31 on its underside, as a second ferromagnetic layer, which may be glued to the underside of the polishing bowl 3. When the polishing bowl 3 is placed on the polishing disc 2, the ferromagnetic layers are effective to couple the polishing bowl 3 to the polishing disc 2, whereby the polishing bowl 3 is entrained in the oscillating vibration of the polishing disc 2.

(16) The polishing disc 2 is fixed on the upper side of the vibration plate 13 by a central screw 24 and a centering disc 22 and is indexed by eccentrically arranged indexing pins 25.

(17) The centering disc 22 engages in a central recess 32 in the base wall of polishing bowl 3 in order to center the polishing bowl 3. Likewise, head bolts 23 engage in corresponding base wall recesses 33 of the polishing bowl 3 to provide a positive fit against rotation between the vibration drive 1 or polishing disc 2 relative to the polishing bowl 3.

(18) FIGS. 5 and 6 are perspective views illustrating the polishing bowl 3 and showing the sheet steel disc 31 at the underside of the base wall. The polishing bowl 3 has a lateral wall 34 with carrying handle 35 attached thereto. As can be seen from FIGS. 3 and 5, lateral wall 34 has a circumferential spline groove 36, and a receiving space for a polishing cloth 6 (FIG. 3) is provided therebelow. The edge of polishing cloth 6 is clamped by a rubber-elastic ring 37 which engages in the spline groove 36 thereby holding down the edge of polishing cloth 6. Finger openings 38 on lateral wall 34 help to remove the elastic ring 37 from spline groove 36 and to replace the polishing cloth 6 in this way, the latter being provided with magnetized ferromagnetic means on its underside for good support and adherence. It is preferred for the polishing bowl to be made of a plastic material. Polishing cloth 6 constitutes a carrier material onto which a polishing agent suspension is applied.

(19) The polishing bowl 3 can be closed with a lockable lid 7 (FIGS. 6, 7) so as to form a closable container for the polishing cloth and the polishing agent suspension. Lid 7 has projections 72 and 73 which fit into base wall recesses 32 and 33 of the polishing bowl, so that closed polishing bowls 3 (FIGS. 6, 7) can be stacked one above the other. It is contemplated to provide, together with a vibration polishing device, a plurality of such polishing bowls (FIGS. 6, 7) which may hold polishing agent suspensions of different granulation. In this way, the vibration polishing device can be used first as a fine grinding device for samples to be polished, and subsequently as a final polishing device.

(20) As can be best seen in FIG. 3, an edge gap 29 is provided between polishing disc 2 and polishing bowl 3, in which a tool can be engaged to gently lift the polishing bowl 3 from the polishing disc 2. The gentle lifting may be mechanized, for example by having a handle with a cam at the front end thereof engaging in the gap 29 (not shown), and the cam widening the gap 29 by turning the tool and thereby gently lifting the polishing bowl 3 from the polishing disc 2, against the magnetic adhesion force. It will also be sufficient to gently lift the polishing bowl by the handles 35.

(21) As can be seen from FIG. 1, the vibration drive 1, the polishing disc 2, and the polishing bowl 3 form a first unit, which is arranged in the protective housing 5 next to the control unit 4 which forms a second unit. The protective housing 5 has an overall wedge-like shape with truncated wedge tip 51 in which the control unit 4 is accommodated. In the section of the truncated wedge tip 51, the upper side of the protective housing 5 is designed as a control panel and may include a touch screen 52. A housing hood 53 serves to cover the vibration polishing device.

(22) FIG. 8 shows the vibration drive 1 with the polishing bowl 3 placed thereon, and with an acceleration sensor 18 that is capable of measuring the accelerations between polishing disc 2 and polishing bowl 3 and of producing acceleration signals therefrom. These signals are fed back to the control unit 4 to control the voltage, current, and pulse output supplied to the vibration drive.

(23) FIG. 9 shows a sectional view through a sample 8 and a sample holder, which can be used to appropriately clamp the sample 8 so that it can be placed with its underside 81 on the polishing cloth 6.

(24) The operation of the vibration polishing device is as follows.

(25) First, a plurality of samples 8 to be polished are prepared for the polishing process. In most cases this means that the samples are positioned in the sample holders 9 such that the surface 81 to be polished protrudes from the sample holder.

(26) Control unit 4 is switched on to output electric currents of predetermined frequency and amperage to set the vibration drive 1 in motion. The vibrations generated on the vibration plate 13 are oscillating and cause the samples 8 to be polished and located in the polishing bowl to perform intermittent bouncing movements while being driven circumferentially in the polishing bowl 3. At each voltage surge, the first and second drive parts 14, 15 move relative to each other, and so does the counter-oscillating part 12 relative to the vibration plate 13, whereby the leaf springs 16 and 17 are tensioned, and when the voltage pulse drops the leaf springs 16 and 17 bring the device parts back into their starting position. Polishing disc 2 is firmly connected to the vibration plate 13 and therefore follows the movements thereof. However, this also applies to the polishing bowl 3, since the latter is entrained mechanically and/or magnetically. Indexing pins 25 prevent an unwanted rotational movement of the polishing bowl 3 relative to the polishing disc 2.

(27) The described embodiment is to be considered by way of example. Various modifications are possible. It is well known that movements can be superimposed on each other. It is possible to provide two first drive parts and two second drive parts and to superimpose the movements generated thereby in order to promote the circulation of the samples to be polished in the pot-shaped polishing bowl. An even more favorable result can be achieved with three first and second drive parts.

(28) It will be apparent to a person skilled in the art that the features, whether disclosed in the specification, the claims, the figures, or otherwise, may individually define essential components of the present disclosure, even if they are described together with other features.