EP3509792B1 - Vibration polishing device - Google Patents

Description

Field of invention

The invention relates to a vibration polishing device for generating an oscillating vibration for a revolving conveying movement of samples to be polished, a polishing plate which is firmly connected to the vibration drive and can be driven by it, and a polishing tub which is used to hold a polishing medium and the polishing medium to be polished Samples is formed and is coupled to the polishing plate for taking along.

Background and general description of the invention

Such a vibratory polisher is by the U.S. 3,137,977 has become known and comprises a rotating motor which drives eccentric weights and which causes the housing to vibrate. The housing is connected to a drive plate which is permanently connected to a trough-like component via rubber-elastic elements, which is supported on a table top or the like via a base housing. A vibration plate is integrated in the device in such a way that it cannot be dismantled and can be brought into frictional engagement with the drive plate via a handle in order to be carried along in its vibrations. The vibrating plate is provided with a polishing agent or polishing cloth and has an annular rim so that it can be viewed as a polishing tub. The specimens to be polished are inserted into the polishing tub using specimen holders and are subject to an orbital movement and a rotary movement at the same time as a result of the vibrations caused by the unbalance drive. However, such an unbalance drive emits strong, harmful vibrations to the supporting environment of the vibration polishing device. Furthermore, the exchange of the polishing plate, which forms a polishing bath, is only possible in a laborious and time-consuming manner by dismantling the device.

Furthermore, the DE 10 2009 044234 A1 a device for surface processing with a working container for receiving workpieces to be processed and auxiliary material for surface processing and a vibratory drive device. The working container can be placed on a plate-shaped electromagnet so that, when the electromagnet is activated, an attractive force is exerted on the working container in order to couple the working container to the oscillating drive device in a vibration-proof manner.

Furthermore, the U.S. 3,978,622 A a device for grinding workpieces, wherein the workpiece is arranged on an abrasive material in a polishing bowl, which in turn is carried by a carrier plate which is set in eccentric rotational movement.

The invention is based on the object of creating a vibration polishing device in which little or no harmful vibrations are given off to the supporting surroundings of the device.

A further aspect of the invention consists in designing a polishing trough, which is designed to hold a polishing medium and the samples to be polished, so that the polishing trough is simply removed from the vibration polishing device and simply exchanged for another polishing trough, possibly with a different polishing medium can.

The object of the invention is achieved by the subject matter of independent claim 1. Advantageous further developments of the invention are defined in the subclaims.

Specifically, there is a vibration drive for generating an oscillating vibration for an orbital movement of samples to be polished, the vibration drive as a unit driving an additional polishing plate to which it is firmly connected. A polishing tub is attached to the polishing plate and is coupled to take with you. The polishing trough is designed to hold a polishing medium and the samples to be polished. As usual, the samples to be polished can be inserted in sample holders.

The special feature is the use of a vibration drive with a fixed base part and two device parts driven against each other, which form a counter-oscillating part and a vibration plate. The vibration plate is firmly connected to a polishing plate, and a polishing trough for receiving a polishing medium and the samples to be polished is detachably coupled to the polishing plate.The vibration plate and the device parts connected or coupled to it form inertia mass driven in one direction of rotation, and the counter-vibrating part with this Connected device parts form a further activity mass driven in the other direction of rotation, so that the total center of gravity in principle remains at a constant point during operation of the device and there is no excitation of vibrations on the fixed base part. As a result, the new vibration polishing device runs extremely smoothly, while the state of the art emits strong vibrations into the environment.

The vibration plate and the counter-vibrating part are driven against the force of leaf springs. With the inertia mass of the vibration plate and the associated or Coupled device parts is a first vibration system, and with the inertial mass of the counter-vibrating part together with connected device parts, a second, counteracting vibration system is formed. Each of these oscillation systems can show its own resonance frequencies. If resonance frequencies occur, the smooth running of the vibration polishing device is disturbed. This disturbance can be detected by an acceleration sensor, the signals of which are fed back to a control part of the vibration polishing device and processed there in order to get out of the disturbed operation.

The oscillating oscillation preferably leads to an intermittent, inclined upwardly directed tangential movement of the samples to be polished with respect to the sample circulation within the polishing tank and thus in particular to the hopping circulation of the samples to be polished within the polishing tank relative to the polishing medium, which leads to the samples slipping on the polishing medium and leads to polishing of the samples on their underside.

A polishing cloth and polishing agent in a suspension are preferred as the polishing medium. Other polishing media can also be used, for example fine abrasive or fine abrasive and / or polishing paper.

To couple the polishing tub to the polishing plate, magnetic adhesion of the polishing tub to the polishing plate is preferred, which achieves an easily detachable vertical or axial magnetic attachment of the polishing tub to the polishing plate.

A magnetic plate or magnetic foil can be glued to the top of the polishing plate or to the underside of the polishing tub. A sheet steel disk or magnetic film disk can be glued to the underside of the polishing bath or to the top of the polishing plate. This is a simple but effective detachable type of attachment.

In addition to the magnetic coupling, form-locking engagement parts which act laterally in a form-locking manner can also be provided, which form centering and indexing means and preferably comprise a centering hub and index pins in order to center and index the polishing bath.

It is preferred to design the polishing trough from a plastic material with a carrier material for a separately handleable polishing agent on the inside of the floor. The carrier material can be a polishing cloth. The polishing trough has a circumferential side wall with a groove which extends above the bottom wall of the polishing trough at a height according to the thickness of the carrier material and which receives a rubber-elastic ring that holds the carrier material on Firmly presses the bottom of the polishing tub and thus prevents the polishing agent suspension from getting under the carrier material.

The polishing tub is advantageously designed as a container for the polishing cloth and polishing agent suspension and can be tightly closed with a lid and is equipped with a handle so that it can be placed on the polishing plate as a container or closed vessel or lifted off the polishing plate. A large number of polishing tubs or containers can thus be available for a vibration polishing device, which can be easily changed on the polishing device and whose specifications are made easily recognizable by means of labels. The polishing tubs or containers are expediently designed to be stackable. During the polishing work to be carried out, different polishing tubs or containers with different degrees of grain size of the polishing agent can be used one after the other without this leading to complications in the processing of the samples to be polished. The samples can namely be cleaned between the individual processing steps in order to avoid carryover of different grain sizes of the polishing medium between individual containers. Apart from that, the containers are also easy to clean.

With regard to the construction of the vibration drive, the vibration plate is fastened to the polishing plate by screwing. The base part and the counter-oscillating part are ring-shaped or disk-shaped and connected via first leaf springs. These leaf springs extend according to radial helical helical surfaces around the central device axis and guide the torsional vibration movements of the counter-vibrating part relative to the base part.

The vibration plate of the vibration drive is connected to the base part via second leaf springs which, like the first leaf springs, extend around the central axis of the device according to radial helical surfaces. An electromotive drive is arranged between the counter-vibrating part and the vibrating plate and preferably comprises a magnetic coil or an electromagnet on the counter-vibrating part and a magnet armature on the vibrating plate in order to generate opposing, oscillating rotary vibration movements between this counter-vibrating part and the vibrating plate during operation by turning the electromagnet on and off, whereby the magnet armature tensions or relaxes the leaf springs. The vibration plate lifts a little from the counter-vibrating part when the leaf springs are tensioned by the drive, and when the drive is briefly switched off, the vibration plate moves back onto the Counter-oscillating part back. By periodically switching the drive on and off, a rotary oscillation movement of the vibration plate relative to the counter-oscillating part can be generated.

The vibration drive with base part, counter-vibrating part and vibration plate, which are connected to each other in pairs via the first and second leaf springs, enable vibration force compensation, in which little vibration energy is radiated into the environment, compared to an unbalance drive, as is the case with previous vibration polishing devices.

Since the inertial masses in the new vibration polisher oscillate in opposite directions, the center of gravity remains more or less at rest, so that the support forces on the location of the vibration polisher remain approximately constant and hardly any vibrations are emitted into the environment. An extremely smooth run is thus achieved with the vibration polishing device according to the invention.

Brief description of the figures

Fig. 1

einen schematischen Längsschnitt durch ein Vibrationspoliergerät,

Fig. 2

einen schematischen Querschnitt durch das Vibrationsgerät,

Fig. 3

eine vergrößerte Einzelheit aus Figur 2,

Fig. 4

einen Vibrationsantrieb in Seitenansicht, teilweise geschnitten,

Fig. 5

eine perspektivische Ansicht von oben auf eine Polierwanne,

Fig. 6

eine perspektivische Ansicht von unten auf eine Polierwanne,

Fig. 7

eine perspektivische Ansicht von oben auf einen Polierwannedeckel,

Fig. 8

eine perspektivische Ansicht eines Vibrationsantriebs mit aufgesetzter Polierwanne von unten,

Fig. 9

eine Schnittansicht eines Probehalters, und

Fig. 10

eine perspektivische Gesamtansicht eines Vibrationspoliergeräts.

An exemplary embodiment is described below with reference to the drawings. Show:

Fig. 1

a schematic longitudinal section through a vibration polishing device,

Fig. 2

a schematic cross section through the vibration device,

Fig. 3

an enlarged detail Figure 2 ,

Fig. 4

a vibration drive in side view, partly in section,

Fig. 5

a perspective view from above of a polishing bath,

Fig. 6

a perspective view from below of a polishing bath,

Fig. 7

a perspective view from above of a polishing tub lid,

Fig. 8

a perspective view of a vibration drive with an attached polishing pan from below,

Fig. 9

a sectional view of a sample holder, and

Fig. 10

Fig. 3 is an overall perspective view of a vibratory polisher.

Detailed description of the exemplary embodiments

The main parts of the vibration polishing device are a vibration drive 1, a polishing plate 2 and a polishing bath 3. The device also comprises a control part 4 and a protective housing 5.

The electromotive vibration drive 1 ( Fig. 4 ) comprises an annular or disk-shaped base part 11, an annular or disk-shaped counter-vibrating part 12, a vibration plate 13 and an electric motor drive with a first drive part 14 and a second drive part 15. The base part 11 is connected to the counter-vibrating part 12 via first leaf springs 16. Furthermore, the base part 11 is connected to the vibration plate 13 via second leaf springs 17. The leaf springs 16 and 17 each form three spring assemblies which are distributed around the circumference of the device. A central or symmetry axis 10 can be assigned to the vibration drive 1, to which the leaf springs 16 and 17 form helical surfaces like threads of a multi-start, very steep screw, which extend radially to the central axis 10 and assume an angle of inclination to the central axis 10 of 18 °. The structure of the vibration drive 1 is detailed in DE 10 2004 034 481 B4 or US 7 143 891 B2 described, to which reference is hereby made in this regard and which are hereby made the subject matter of the present disclosure by reference.

How Figure 1 and 2 show, the polishing plate 2 is firmly connected to the vibration drive 1, namely screwed to the vibration plate 13 at 24 and indexed at 25. On its upper side, the polishing plate 2 has a magnetic plate or a magnetic film 21 as a first ferromagnetic layer ( Fig. 3 ), which is attached to the top of the polishing plate 2, is glued in this example. Head bolts 23, which engage in engagement openings 33 of the polishing bath 3, can be viewed as form-fit engagement parts of a quick-release coupling.

The polishing trough 3, preferably made of plastic, is coupled to the polishing plate 2 to be carried along and for this purpose has a magnetic foil disk or sheet steel disk 31 as a second ferromagnetic layer on its underside and can be glued to the underside of the polishing trough 3. When the polishing tub 3 has been placed on the polishing plate 2, the ferromagnetic layers interact to couple the polishing tub 3 with the polishing plate 2, whereby the polishing tub 3 is entrained in the oscillating vibration of the polishing plate 2.

The polishing plate 2 is fastened by means of a central screw 24 and a centering disk 22 on the upper side of the vibration plate 13 and is indexed by eccentrically arranged index pins 25.

The centering disk 22 engages in a central recess 32 in the bottom wall of the polishing bath 3 in order to center the polishing bath 3. The head bolts 23 likewise engage in corresponding bottom recesses 33 of the polishing tub 3 in order to produce a form fit against relative rotation between the vibration drive 1 or the polishing plate 2 and the polishing tub 3.

The polishing tub 3 is in Figure 5 and 6th shown in perspective and shows the sheet steel disk 31 on the underside of the bottom wall. The polishing tub 3 has a side wall 34 with a handle 35 attached to it. How out Figure 3 and 5 As can be seen, the side wall 34 has a circumferential keyway 36, under which there is a space for a polishing cloth 6 ( Figure 3 ) is located. The edge of the polishing cloth 6 is clamped by a rubber elastic ring 37 which engages in the keyway 36 and holds the edge of the polishing cloth 6 down. Finger openings 38 on the side wall 34 facilitate the removal of the elastic ring 37 from the groove 36 and thus the change of the polishing cloth 6, which is provided on its underside with magnetized, ferromagnetic means in order to fit and adhere well. It is preferred to manufacture the polishing tub from a plastic material. The polishing cloth 6 is a carrier material onto which a polishing agent suspension is applied.

The polishing bath 3 can be equipped with a lockable cover 7 ( Fig. 6 , 7th ) are closed, so that a closable container for the polishing cloth and the polishing agent suspension is created. The cover 7 has projections 72 and 73 which fit into the base recesses 32 and 33 of the polishing tub, so that closed polishing tubs 3 ( Fig. 6 , 7th ) are stackable on top of each other. A certain number of such polishing tanks ( Fig. 6 , 7th ) that can hold polishing agent suspensions with different grain sizes. In this way it is possible to use the vibration polishing device first as a fine grinding device for samples to be polished and then as a final polishing device.

How best to look Figure 3 As can be seen, there is an edge gap 29 between the polishing plate 2 and the polishing pan 3, into which a tool can engage in order to gently lift the polishing pan 3 from the polishing plate 2. The gentle lifting can be mechanized, for example, by engaging a handle with cams at the front end in the gap 29 (not shown), whereby by turning the tool the cam widens the gap 29 and thus the polishing bath 3 gently against the magnetic adhesive force of the polishing plate 2 takes off. It is also sufficient to gently lift the polishing tub by the handles 35.

How according to Figure 1 As can be seen, the vibration drive 1, the polishing plate 2 and the polishing tub 3 form a first unit, which is in the protective housing 5 next to the control part 4 as the second Unit is arranged, the protective housing 5 overall has a wedge-shaped shape with truncated wedge tip 51, within which the control part 4 is housed. The top of the protective housing 5 in the area of the truncated wedge tip 51 is designed as a control panel and can have a touchscreen 52. A housing cover 53 is used to cover the vibration polisher,

Fig. 8 shows the vibration drive 1 with the polishing bath 3 attached and with an acceleration sensor 18 which is able to measure the accelerations between the polishing plate 2 and the polishing bath 3 and to generate acceleration signals therefrom. These signals are fed back to the control part 4 in order to intervene in a regulating manner in the voltage, current strength and pulse output supplied to the vibration drive.

Fig. 9 shows a sectional view through a sample 8 and a sample holder with which the sample 8 can be appropriately clamped in order to be placed with the underside 8 on the polishing cloth 6.

The operation of the vibratory polisher is as follows.

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

The control device 4 is switched on for the delivery of electrical currents of predetermined frequency and strength in order to set the vibration drive 1 in motion. The vibrations generated on the vibrating plate 13 are oscillating and cause the samples 8 located on the polishing bath and to be polished to start jumping in batches and thereby being driven in a rotating manner in the polishing bath 3. With each voltage surge, the first or second drive part 14,15 move relative to one another and thus also the counter-oscillation part 12 to the vibration plate 13, whereby the leaf springs 16 and 17 are tensioned, and when the voltage pulse decreases, the leaf springs 16 and 17 lead the device parts in their original position back. The polishing plate 2 is firmly connected to the vibration plate 13 and thus makes its movements with it. However, this also applies to the polishing bath 3, since it is taken along mechanically and / or magnetically. The index pins 25 prevent an undesired rotary movement of the polishing bath 3 in relation to the polishing plate 2.

The embodiment described is to be assessed as an example. Various modifications are possible. As is well known, movements can be superimposed. There can be two first drive parts and two second drive parts, their generated movements be superimposed in order to promote the circulation of the sample to be polished in the cup-shaped polishing trough. An even more favorable result can be achieved with three first and second drive parts.

Claims (12)

1. A vibration polishing device comprising:

   - a vibration drive (1);

   - a polishing disc (2) firmly connected to the vibration drive (1); and

   - a polishing bowl (3) adapted to receive a polishing medium and the samples (8) to be polished, and which is coupled to the polishing disc (2);
   characterized in that the vibration drive (1) comprises
   a base part (11), a counter-oscillating part (12), a vibration plate (13), a first drive part (14), and a second drive part (15);
   wherein the base part (11) and the counter-oscillating part (12) are coupled by first leaf springs (16) having their main planes grouped around a central axis (10) in accordance with radial helical surfaces;
   wherein the base part (11) and the vibration plate (13) are coupled by second leaf springs (17) having their main planes grouped around the central axis (10) in accordance with radial helical surfaces; and
   wherein the first drive part (14) is arranged so as to be supported on the counter-oscillating part (12), and the second drive part (15) is arranged so as to be supported on the vibration plate (13), for generating oppositely oscillating rotational oscillatory movements between the counter-oscillating part (12) and the vibration plate (13) when the vibration drive (1) is in operation.
2. The vibration polishing device according to claim 1, further comprising;

   - a control unit (4) for power supply to the first and second drive parts in terms of voltage, current, and pulse formation; and

   - an acceleration sensor (18) which measures accelerations occurring when the device is in operation, on the counter-oscillating part (12) and on the vibration plate (13) and thus also to the polishing disc (2) and to the polishing bowl (3) and which generates acceleration signals based thereon, which are fed back to the control unit (4).
3. The vibration polishing device according to claim 1 or 2,
   wherein the polishing medium comprises a carrier material and polishing agent.
4. The vibration polishing device according to claim 3,
   wherein the carrier material is a polishing cloth (6) and the polishing agent is provided in the form of a polishing agent suspension.
5. The vibration polishing device according to any one of claims 1 to 4,
   wherein the polishing bowl (3) is coupled to the polishing disc (2) so as to be detachable.
6. The vibration polishing device according to claim 5,
   wherein the detachable coupling of the polishing bowl (3) to the polishing disc (2) is by magnetic holding force.
7. The vibration polishing device according to claim 6,
   wherein ferromagnetic layers or parts are attached on the upper side of the polishing disc (2) and on the underside of the polishing bowl (3).
8. The vibration polishing device according to any one of claims 5 to 7,
   wherein the polishing bowl (3) is in the form of a plastic container for the carrier material and for the polishing agent suspension and can be closed with a lid (7) and has a carrying handle (35) to be placed on the polishing disc (2) and lifted from the polishing disc (2) as a closed container.
9. The vibration polishing device according to claim 8,
   wherein closed containers are stackable one above the other.
10. The vibration polishing device according to claim 9,
    wherein the polishing bowl (3) has a central recess (32) at its underside and the lid (7) has a central projection (72) on its upper side such that containers to be stacked one above the other can be fitted with their respective central recess (32) onto the respective underlying projection (72).
11. The vibration polishing device according to any one of claims 1 to 10,
    wherein centring and/or indexing means (22, 32; 23, 33) are provided between the polishing disc (2) and the polishing bowl (3).
12. The vibration polishing device according to any one of claims 1 to 11,
    wherein the polishing bowl (3) has a base wall with a receiving space for the polishing medium and a circumferential lateral wall (34) with a spline groove (36) for receiving a rubber-elastic ring (37) which is adapted to clamp the edge of a polishing cloth (6) that forms part of the polishing medium.

Images