DE202005009665U1 - Industrial grinding or roughening disc has peripheral notches at regular intervals - Google Patents

Abstract

An industrial grinding or roughening disc has an essentially circular planform with inner an outer (12) zones. The outer periphery has three trapezoidal notches (22) at mid-point intervals of 120.

Description

The The invention relates to a grinding wheel with a disc-shaped or plate-shaped carrier. On the circumference of the flap disc recesses are cut away.

By the recesses will allow that Grinding result during grinding constantly check. Through the recesses is also the heating of the machined workpiece reduced.

grinding and cutting discs, where granular Abrasive material applied directly to the disc or plate-shaped carrier and in which visual recesses are provided, are known from DE-A-1 652 912, DE-U-298 02 791 and WO00 / 35634. The visual recesses are circular openings of the carrier or incisions provided on the circumference with rounded flanks.

Out US 6,007,415 grinding wheels are known in which the recess can have any shape and concrete segment-shaped recesses are described.

Out EP-A-0 400 783, EP-A-0 912 293 and EP-A-1 047 528 are nonwoven abrasive discs known.

The The object of the invention is a grinding wheel in which the Success of grinding over the entire abrasive coating running on the machined workpiece surface can be observed.

According to the invention this Task solved by that the edge area of the grinding wheel at an angle of up to falls to 30 ° and that the recesses are approximately trapezoidal or the shape of the Part of a circular ring have.

The lateral edges the recesses must not exactly radial, deviations of plus / minus about 15 ° are permissible.

Thereby, that both the front edge and the rear edge of the recesses runs approximately radially, results from an opening of the recesses field of view that on the total radial extent of the recesses the grinding result evenly well lets recognize. Due to the relatively large radial extent of the visual recesses, results in an optimal Review of the entire grinding area, so that manages the Sizes of the ground area and to reduce the grinding volume to the minimum. This works especially advantageous when grinding welds.

Preferably Two or three such views are evenly distributed provided on the circumference of the grinding wheel. Especially preferred are three visual recesses.

Taken together, The recesses preferably extend over an angle of 60 ° to 100 °, in particular around 70 to 90 °. With three recesses, each recess then has e.g. a width from about 27 °.

One Another advantage of the flap disc according to the invention consists in that the tendency to run away of the grinding tool on the workpiece is greatly reduced.

Surprisingly has been shown that, despite the size of the visual recesses and the radial course of the rear and possibly also the front margins the recesses do not risk the grinding wheel on unevenness of the workpiece hooks. It is e.g. easily possible, protruding nail heads or screw heads grind.

Of the Edge area in which the grinding wheel at an angle of up to can drop to 30 ° a width of about half up to one third of the radius of the grinding wheel have.

Preferably is the inclination angle of the edge region 7 to 15 °, in particular about 10 °. In general the grinding wheel is cranked, i. the interior, which lies within the sloping hand area, is flat and deepened.

In a first preferred embodiment If the grinding wheel is a roughing wheel. The Depth of the recesses is this about one-third of the radius and does not include the entire sloping Border area. Its width is about half of the radius.

Thereby that the roughing disc is in the shape of a very flat truncated cone she is very stable. Furthermore becomes thereby a surface Grinding achieved as with a roughing disc with a flat edge area, at the as well The machine axis must be kept very flat. The surface section, that with the roughing disc according to the invention achieved can be observed very well as a result of the visual recesses become.

In a second preferred embodiment the grinding wheel is designed as a grinding fleece disc. Of the sloping edge region in turn has the width of about the half radius of the grinding wheel, here the depth of the visual recesses nearly equal to half the radius of the grinding wheel.

at the embodiment As a grinding fleece disc, the grinding wheel acts as a carrier of the abrasive fleece. The work surface The abrasive fleece disc is flat, so that the truncated cone shape of the carrier the strenght the layer of abrasive fleece or abrasive material towards the edge gets bigger.

The Pad of the abrasive fleece on the carrier has a circular recess in the middle. The radial width of the abrasive nonwoven pad is preferably greater than the radial depth of the visual recesses, so that also on the inner Edge of the visual recesses still abrasive fleece is present.

Of the Täger the Abrasive fleece disc can be made of fiberglass, sheet metal or plastic consist. The base material of the abrasive fleece is preferably because of the visual recesses overall more stable trained than at Abrasive fleece discs without visible cutouts.

Two embodiments The invention will be explained below with reference to the drawing. It demonstrate:

1 a roughing wheel in plan view;

2 the roughing wheel of 1 in section to 2-2;

3 a Schleifvliesscheibe in plan view and

4 the abrasive fleece disc of 3 on average after 4-4.

In the 1 and 2 shown grinding grinding wheel 10 is plate-shaped with an annular outer area 12 and a recessed or cranked interior 14 on, being in the middle of the interior 14 a clamping hole 16 is located, with which the roughing disc can be tightened on the clamping pin of an angle grinder. The circular outer area 12 falls to the outside at an angle of about 10 ° slightly.

The roughing disc has three recesses arranged at an angular distance of 120 ° 22 , which have trapezoidal shape or the shape of the part of a circular ring and each extending over an angle of about 27 °. The radial depth of the recesses 22 is about one third of the radius of the roughing wheel 10 ,

The in the 3 and 4 shown abrasive fleece disc 20 has a plate-shaped carrier 21 , which in its form is essentially the roughing wheel 10 of the 1 and 2 However, the recesses are slightly deeper and have a depth of almost half the radius of the wearer 21 to have.

On the carrier 21 is a one to two centimeter thick layer of a sanding fleece 30 glued. The carrier 21 opposite side of the abrasive fleece is the work surface, and this is flat. The sanding fleece 30 covers the entire top of the vehicle 21 with the exception of a central recess. At the outer edge of the material of the abrasive fleece is about five millimeters above the edge of the carrier 21 above.

The recesses 22 are also present in the material of the abrasive fleece. The radial extent of the abrasive fleece is so large that even at the inner edge 28 the recesses 22 Abrasive nonwoven material is present, so that the abrasive nonwoven material forms a closed circle inside.

10

Grinding discs

12

border area

14

interior

16

Einspannbohrung

20

Grinding fleece disc

21

carrier

22

recesses

28

internal edge

30

Nonwoven abrasive / pad

Claims (7)

Grinding wheel with an interior area ( 14 ) and a border area ( 12 ) and recesses ( 22 ) at the edge ( 12 ), characterized in that - the recesses ( 22 ) are approximately trapezoidal or have the shape of the part of a circular ring, and - that the edge region ( 12 ) drops at an angle of 5 to 30 °. Grinding wheel according to claim 1, wherein the radial depth of the recesses ( 22 ) is about one-third to one-half the radius of the grinding wheel. Grinding wheel according to claim 1 and 2, wherein the recesses ( 22 ) together over an angle of 60 ° to 100 °. Grinding wheel according to claim 5, wherein the recesses ( 22 ) extend together over an angle of about 81 °. Grinding wheel according to one of claims 1 to 4, wherein the grinding wheel is a roughing wheel and the radial depth of the recesses ( 22 ) is about one third of the radius of the grinding wheel. Grinding wheel according to one of claims 1 to 4, with a support made of non-woven abrasive material ( 30 ), wherein the radial depth of the recesses ( 22 ) corresponds to about half the radius of the grinding wheel. Grinding wheel according to claim 6, wherein the working side of the abrasive fleece ( 30 ) is a flat surface and the material thickness of the support ( 30 ) decreases from outside to inside and the radial dimension of the support ( 30 ) is greater than the radial depth of the recesses ( 22 ).