WO2012095065A1

WO2012095065A1 - Grinding method

Info

Publication number: WO2012095065A1
Application number: PCT/DE2011/001987
Authority: WO
Inventors: Hans-Richard DEES
Original assignee: Dees Hans-Richard
Priority date: 2011-01-11
Filing date: 2011-11-15
Publication date: 2012-07-19
Also published as: DE112011104700A5; DE102011008313A1

Abstract

In a grinding method for the operation of grinding devices with an abrasive agent, a sequence of impacts are applied to the abrasive agent (63) by a pressure-applying device (65) during the grinding operation, wherein the impacts comprise force components perpendicular to the grinding plane of the abrasive agent (63) which press the abrasive agent (63) against the workpiece (62) in a pulsed manner.

Description

Grinding process Description:

The invention relates to a grinding method for the operation of grinding devices with a coated with an abrasive pressure plate for pressing the abrasive to the workpiece to be ground and in particular a

Grinding process for the operation of belt sanding machines with a rotating sanding belt and with a

Pressure device for pressing the sanding belt onto the workpiece to be sanded.

Grinding devices are known and proven in various embodiments. Many hand-guided

Abrasive devices, such as vibratory or eccentric grinders, are as abrasive an arc of abrasive paper or abrasive cloth on two opposite sides of one

Pressure plate set, which drives the pressure plate and thus the abrasive in motion via an axis driven by a motor. The pressure plate with a mostly soft and often perforated for a suction of the grinding dust coating ensures a transfer of

Hand and applied by the tool weight pressure force and a support of the abrasive against the

grinding workpiece. Furthermore, belt sanders are known. The construction of belt sanding devices is basically of the type that of a lower strand of circulating around two rollers

Abrasive belt the surface of a workpiece is processed on a workbench. In particular stationary

Belt sanders are specially trained

Pressure devices that press a granulated side of the abrasive belt on the workpiece to be ground. In particular, you will find different things profiled pinch rollers use. Furthermore are

stamp-like cushions have become known by the

Sanding belt is also loaded. By a load by which the necessary contact pressure of the abrasive is applied to the workpiece, both the workpiece and the abrasive are exposed to high thermal loads. In addition, there is a considerable wear of the abrasive, for example, by the lack of use of the abrasive grain or by the setting of grinding dust by as it is a burn-in.

Against this technical background, the object of the invention is to provide a grinding method for the operation of grinding devices of all kinds, by means of which the service life of an abrasive is optimized and in which the grinding pattern on a workpiece can be influenced in many ways.

This technical problem is solved by

Grinding process acc. the claims 1 and 3.

In claim 1 is guided in particular by hand

Grinding devices turned off that during the

Abrasive process by a pressure device, a sequence of shocks is applied to the abrasive and that the bumps on the grinding plane of the abrasive perpendicular, pulse-like the abrasive against the workpiece pressing force components have.

Thus, for example, the sandpaper of an orbital sander receives, as it were, perpendicularly to the sanding plane, by means of which the pressure force is increased by a motor. In addition, the

Grain cleaned and cooled the sandpaper, whereby its life is significantly increased. This method is gem. of claim 2 by the

Further developed measures that during the grinding process by at least one impactor of the pressure device, a sequence of shocks through a recess in the

Pressure plate is applied to the abrasive and that the shocks on the grinding plane of the abrasive perpendicular, pulse-like the abrasive against the workpiece pressing force components have. As a result of this measure, the abrasive is no longer fully loaded by the pulses, but only locally.

In the aforementioned, manually guided

Grinding devices lend themselves to the anticipation of such a separately formed and driven

Pressure device with a striker on a set on the pressure plate, a frame of the same for setting the abrasive or a coaxial to a drive shaft training. Regardless of this, then the pressure plate is to be provided with suitable recesses so that of the

Pressure device the shocks can be applied to the abrasive itself.

Preferably for the operation of belt sanders with a rotating abrasive belt and with a

Pressure device for pressing the sanding belt on the workpiece to be ground according to claim 3, the measures provided that during the grinding process by at least one impactor of the pressure device, a sequence of shocks is applied to the abrasive belt and that the joints each one perpendicular to the sanding belt , Pulseless, the abrasive belt against the workpiece pressing force component. Surprisingly, it has been shown that by these measures the life of an abrasive such as a

Abrasive paper or abrasive tape to a considerable extent improved, the grinding time can be reduced and the grinding can be simplified as a whole.

This can be attributed, on the one hand, to the fact that, due to the short, hard impacts, comparable to strokes, the

Abrasive is vibrated substantially perpendicular to the grinding surface and it is thereby beaten downright with its abrasive grains on the workpiece to be ground and in addition by the resulting vibration, the ambient air between the workpiece and

Sanding belt device, which produces better cooling. In addition, such hits are the grain of the

Also clean abrasive from stubborn sanding dust. It is further contemplated that the frequency of the sequence of impacts and / or the level of the perpendicular to the abrasive component of the force is adjustable. As a result, the sanding pattern can be varied within wide ranges. This both in terms of the fineness of the cut and in adaptation to the material of the workpiece to be machined.

For this purpose, an adjustability of the speed of a drive device of the aria pressure device for the movement of the impactor is usually sufficient, by the

Frequency of shocks can be varied. Next will

As a result, the force can be varied, but in addition or, alternatively, to different profiles as well as to different materials of the impactor can be thought. These are for adjustments, for example, to the material of the workpiece to be ground expediently

interchangeable.

In particular special geometries or materials of

Impactors also allow the impact to be applied to the abrasive over a flat contact surface of the impactor. It may also be thought in an embodiment of the method according to the invention that the

Pressure surface is caused by a deformation of the impactor. For example, this is the case if an existing of an elastic material impactor by the between a fixed point of

Pressure device, such as a striker

supporting role, and a grinding belt on the workpiece remaining gap is pulled along by the rotating abrasive belt as it were or is pressed in a fixed abrasive paper from a separate drive of the roll through this gap then under deformation of the impactor body. It can by the variation of the deformation and thus the

For example, by adjusting the height of the pressure device on the sanding belt or sandpaper on the sanding image to a considerable extent influence. By the geometry of the impactor can also be achieved that the pressure surface is reduced to a pressure line transverse to the main direction of movement of the abrasive, in particular transversely to the direction of rotation of an abrasive belt. This results in a shock with a comparatively violent impact on the abrasive, preferably extending over the entire width of the abrasive.

In particular, in such impact bodies, it is advantageous if between the pressure device of a fixed

Grinding device according to the invention and a workpiece relative movement can be specified. This is

possible if the pressure device over the abrasive on the workpiece and / or the work table with fixed

clamped workpiece along and / or transversely to the

Abrasive is movable. Thus, the entire surface to be ground of the workpiece can be subjected to the method according to the invention and the overall grinding pattern

be designed uniformly. In a preferred embodiment of the grinding method according to the invention it is provided that a plurality of

Rotating the impactors on a roller, apply the shocks to the abrasive. Preferably, then impact body evenly arranged over the circumference of a roll and bring with the role rotating the impactors on the impact on the abrasive. In practice tests has been at

Belt sander devices have shown that the impactors of such a roll can remain on the sanding belt much longer than conventional pinch rollers, without causing a groove or the like to be creased in the workpiece. As an alternative to such a role, in which strike the impactor in particular by the centrifugal forces on the abrasive belt, it can be provided that at least one impactor on a standing perpendicular to the abrasive stroke applies a shock on the abrasive, for example, driven by an eccentric, pneumatic after Type of known rotary hammers or the like. Such solutions are operated in particular by their possible small designs in the manual

Grinding devices with a sandpaper are preferred.

Regardless of this it can further be provided that transversely to the main direction of movement of the abrasive such as

Circulation direction of an abrasive belt a variety of

Impact bodies is arranged. It is by the

Impactor the entire width of an abrasive

covered. A variant provides in this case that such impactors are set in particular transversely to the direction of rotation of an abrasive belt gap.

In certain grinding tasks may further be provided that a striker rotates about an axis parallel to its stroke or radially to the axis of a roll. The essence of the invention will be explained in more detail with reference to the drawing, in which substantially embodiments are shown schematically and not to scale. In the drawing shows: Fig. 1: a first device for carrying out the

2, a second device for carrying out the

Method with an impactor which applies a shock to the abrasive by a stroke perpendicular to an abrasive, FIG. 3: a third apparatus for carrying out the invention

inventive method with a

Impactor, by a standing perpendicular to a sanding belt stroke on the

Applying sanding belt,

4 shows a first embodiment of a

Pressure device with a rotating roller and

Fig. 5: a second such embodiment.

FIG. 1 shows, not to scale, a worktable 61 with a resting workpiece 62 to be ground. The surface thereof is provided by a grained underside of an abrasive 63, such as an abrasive paper

Schleifleinens a otherwise not further indicated, manually guided or in example. A drill stand

ground grinding device.

The necessary contact pressure is transmitted via a pressure plate 64 on the abrasive 63, the one

Impact body of a separate pressure device 65th

forming, which acts on the abrasive 63 with a sequence of vertical shocks.

The pressure plate 64 is offset by a drive device 66 vertical vibrations indicated by dash-dotted lines on the central axis 67, around which rotates the pressure plate for grinding, for example. Be called By adjusting the speed of the eccentric disc 68, the frequency of the sequence of shocks of the pressure plate 64 can be adjusted by adjusting the speed of the eccentric disc 68, the vibrations and the associated shocks by an only indicated eccentric. If the pressure plate 64 occupied on the underside with an elastic material, is also on the hub and, consequently, by the extent of the predetermined

Deformation set on the abrasive 63 perpendicular force component and applied.

FIG. 2 shows, comparably to FIG. 1, an off-scale one

Its surface is of the provided with a grain underside of the abrasive 3 as an abrasive paper or Schleifleinens otherwise not further indicated, manually guided or in example. A drill stand

ground grinding device.

The necessary contact pressure is applied via a pressure plate 4 directly on the top of the abrasive. 3

transferred, which is provided with a recess 5 for a striker 6 of a separately formed pressure device 7. Through the recess 5 through the impactor 6 can act directly and selectively on the top of the abrasive 3, shown in phantom.

The impactor 6, according to the desired

Sanding pattern can be designed very different, indicated by the example here different cross sections of preferably transverse to one

Main movement direction of the abrasive 3 according to double arrow 8, for example. An orbital sander over the entire width of the abrasive 3 extending strips 9-11. Be through the strips 9 flat pressure surfaces 12th

formed, which are triangular in cross section

Are 10 rather for a pressure line, which is transverse to the main direction of movement according to arrow 8 of the abrasive. 3 extends. Rounded cross sections according to the strips 11 lead, depending on the elasticity of the material used and the choice of the applied on the back of the abrasive 3 force, from very narrow to linear

Pressure surfaces. Alternatively, of course, a flat pressure surface extending over the entire underside of the impactor 6 can be formed.

The impactor 6 is offset by a drive device 13 in vertical vibrations, for example via the again only indicated eccentric with a

Excenter 14. By the speed of the eccentric disc 14, the frequency of the sequence of shocks of the impactor 6 can be adjusted with strips 9-11. Are the strips 9-11 and a striking body 6 itself made of an elastic

Material, is also on the stroke and concomitant by the degree of the predetermined deformation of the impactor 6 and the last 9-11 the perpendicular to the abrasive 3 force component, comparable a blow

perpendicular to the abrasive 3, and adjusted

applied.

It has turned out to be advantageous if at certain

Abrasive tasks such a striking body 6 can, for example, its central stroke axis 15 rotate, for example, with a then on a suitably trained and driven turntable arranged eccentric drive.

Fig. 2 shows a centrally arranged pressure device 7. It is then expediently the shaft 16 of the

Pressure device 7 coaxially, in particular radially inwardly lying a hollow shaft for the drive of the pressure plate 4 are arranged and thus machine-fixed. Alternatively, but possibly also in addition, more

Pressure devices be formed pressure plate fixed.

Figure 3 shows comparable to the previous figures not to scale a workbench 20 with resting, too Its surface is ground by a provided with a grain of a lower strand 22 of an abrasive of otherwise only indicated, revolving around rollers of a belt grinding abrasive belt 23.

The necessary for the grinding contact pressure is applied by a pressure device 24 with impactor 25, according to the preceding embodiment

formed, which is arranged between the lower strand 22 and an upper strand, not shown, thus between the parallel portions of the rotating abrasive belt 23rd

According to the desired grinding pattern designed differently in cross-section extend transversely to the

Circumferential direction indicated by arrow 26 of the grinding belt 23 over the entire width of the grinding belt 23, the strips 27-29 of the impactor 25. A striking body 25 may extend over the entire length of

Workpiece 21 in the direction of rotation of the abrasive belt 23 according to arrow 26 extend. In a shock body 25 of shorter length as shown in Figure 3, it is useful if at least over the entire length of the workpiece 21, a relative movement between the impactor body 25 and the

Workpiece 21 is possible, for example. By the fact that the

Impactor 25 over the workpiece 21 along the

Circulation direction of the grinding belt 24 gem. Arrow 26 is arranged to be movable and / or that a grinding table with fixed clamped workpiece 21 in the manner of a cross table, if necessary, also transversely to this direction of rotation is adjustable. The same applies to a method transverse to the

Circulation direction acc. Arrow 26, if the width of the too

machining workpiece 21 is dimensioned larger than the width of the impactor 25 and the abrasive belt 23rd

This also applies to the embodiments explained further below. In the grinding method according to the invention, in particular in belt grinding a pressing device 31 gem. 4, in which a plurality of impactors 32 about the circumference of an arrow 33 according to an axis 34th

rotating roller 35 are arranged. This roller 35 has with respect to the axis 34 axially outboard flanges 36 which are supported on the axle 34 via spokes, not shown. In addition, the flanges 36 by a

Variety of rods 37 connected in a cage 38 on a circular line. The rods 37 pass through the tubular

Impact body 32 of oblong oval cross-section of a preferably elastic material. Upon rotation of the roller 35 according to arrow 33, the impactors 32 are driven by the centrifugal forces occurring radially outward, shown in the left half of FIG. 3, and hang as it were on the rods 37, one of which in Fig. 3 in the right Half of the picture isolated

is shown. By striking the abrasive belt 39, a striking body 41 can move radially inward of the roller 35 to form a pressure surface 40, resulting in a variety of design possibilities of pressure surfaces 40. In the case of very elastic striking bodies 41, comparatively large pressure surfaces 40 are formed, while in the case of very hard striking bodies 41 with a strong rounding, pressure surfaces 40 extending almost linearly extend

will occur. In addition to the radial deflection of the

Impact body 41 will usually make this obliquely and deform.

This also depends on the rotation of the roller 35 according to arrow 33, which can be caused by an electric motor or drive only by entrainment of the impactor 32 by the rotating grinding belt 39.

The expected grinding pattern of the surface of a workpiece is further determined by groups of impactors 32 in the direction of the abrasive belt 39 gem. Arrow 42 this burden. The number of members of such a group and thus the total area of the burden of the

Abrasive belt 39 by impactor 32 can be further adjusted by the height of the axis 34 above the grinding belt 39, alternatively by a change in the number of impactors 32 over the circumference of the roller 35 and thus the grinding pattern can be varied. Figure 5 shows a variant of a pressure device 45 with a roller 46. About the circumference of the roller 46 are in

Recordings 47 a plurality of impactors 48 fixed

captured. If the roller 46 rotates according to arrow 49, the striking bodies 48 and their holding webs 50, which are held at one end in each case with a shaped part 51 in a receptacle 47, become radially aligned, recognizable in the left-hand half of FIG.

By varying the distance of the axis 52 of the roller 46 on the circulating as indicated by arrow 53 abrasive belt 54, the force of the impact on the abrasive belt 54 can be varied by the impactor 48, as in a different degree of

Retaining bar 50 is compressed and / or angled. Likewise, the deformation of the impactor 48 itself influences the force component perpendicular to the grinding belt 54 when a striking body 48 hits.

The impactor 48 may be rod-shaped and extend perpendicular to the plane of the drawing over the entire width of the sanding belt 54. Alternatively, it is possible to form such impact body 48, for example, in spherical form and axially successively a plurality of wheel-like rollers 46 to arrange with impactors 48, transverse to the direction of rotation arrow 53 of the abrasive belt 54. Then there is also the possibility of rollers 46 with over the circumference arranged impactors 48 against each other twisted axially enforce each other, so that impactor 48 are then placed on the gap. The shaped pieces 51 can then be designed to be rotationally symmetrical with respect to an axis 55 extending radially with respect to the axis 52 of the roller 46, whereby a rotation of the striking bodies 48 about this axis 55 is basically possible.

FIG. 5 shows, in the third quadrant of the roller 46, a further variation of the connection of impactors 56

Impact body 56, of comparatively great dimensional stability, are mounted radially displaceably in receptacles 57 of the roller 46. If the roller rotates according to arrow 49, then the striking bodies 56 move radially outwards, as shown. Then meet these impactors 56 on the abrasive belt 54, the impactor 56 are moved radially inward and, barely deformed, the gap between the grinding belt 54 and the roller 46 pass.

Claims

Claims: 1. A grinding process for the operation of grinding devices with a coated with an abrasive pressure plate for pressing the abrasive to the zu

grinding workpiece, characterized in that during the grinding process by a pressing device, a sequence of shocks is applied to the abrasive and that the impact on the grinding plane of the

Abrasive vertical, impulsive the

Abrasive against the workpiece pressing

Have force components.

2. A grinding method according to claim 1, characterized in that during the grinding process by at least one striking body (6) of the pressure device (7) applied a sequence of shocks through a recess (5) in the pressure plate (4) directly on the abrasive (3) and that the bumps on the grinding plane of the

Abrasive (3) perpendicular, pulse-like the abrasive (3) against the workpiece (2) pressing

Have force components.

3. grinding process, especially for the operation of

Belt sanders with a circumferential

Sanding belt and with a pressure device for pressing the sanding belt on the sanding

Workpiece, characterized in that during the

Grinding operation by at least one impact body (25) of the pressure device (24) a sequence of impacts directly on the abrasive belt (23) is applied and that the shocks on the abrasive belt (23) perpendicular

standing, impulsively the abrasive belt (23) against the Workpiece (21) have pressing force components.

4. grinding method according to one or more of

preceding claims, characterized in that the frequency of the sequence of shocks and / or the amount of perpendicular to the abrasive component of the force is adjustable.

5. grinding method according to one or more of

preceding claims, characterized in that the impact on a flat pressure surface (12) of the impactor (6) is applied to the abrasive (3).

6. grinding method according to one or more of

preceding claims, characterized in that a pressure surface (40) by a deformation of the

Impactor (41) is caused.

7. grinding method according to one or more of

preceding claims, characterized in that the pressure surface on a pressure line transverse to the

Main movement direction of the abrasive is reduced.

8. grinding method according to one or more of

preceding claims, characterized in that the

Pressure device (24) over the abrasive

(Sanding belt 23) is movable.

9. grinding method according to one or more of

preceding claims, characterized in that a plurality of impactors (32) on a roller (35) rotate the impacts on the abrasive

(Abrasive belt 39) applies.

10. grinding method according to one or more of

preceding claims 1 to 8, characterized in that at least one impactor (6) via a perpendicular to the grinding plane of the abrasive (3) stationary stroke applying a shock to the abrasive (3).

11. grinding method according to one or more of

preceding claims, characterized in that a plurality of impactors is arranged transversely to the main direction of movement of the abrasive.

12. grinding method according to claim 11, characterized

characterized in that impact body in

Main movement direction of the abrasive are set to gap.