US-12623314-B2 - Pressing element for a grinding belt, with cooling

US12623314B2US 12623314 B2US12623314 B2US 12623314B2US-12623314-B2

Abstract

The invention relates to a press-on element 1 for an abrasive belt 30 , in particular for wide belt grinding machines, consisting at least of a backing material 10 with a padding 3 and a sliding layer 4 . To clearly improve the grinding results, a method and a press-on element 1 based thereon are employed which permits an additional cooling of the padding 3 and thereby the abrasive belt 30 . The press-on element 1 here substantially consists of a padding 3 consisting of a spacer fabric. The spacer fabric is manufactured from two loosely woven textile surfaces which are connected to each other by pile threads so that the cooling medium can flow through the padding 3.

Inventors

Thomas Hülsemann

Assignees

Hülsemann GmbH

Dates

Publication Date: 20260512
Application Date: 20220117
Priority Date: 20210125

Claims (15)

1 . A press-on element ( 1 ) for a wide belt grinding machine comprising: a backing material ( 10 ) with a padding ( 3 ), and a sliding layer ( 4 ), wherein the padding ( 3 ) comprises a spacer fabric, and wherein a cooling medium penetrates, via a first chamber of a sanding pad mounting, through at least one first passage, into the spacer fabric and, after the cooling medium has flowed through the spacer fabric, exits through at least one second passage into a further chamber of the sanding pad mounting.
2 . The press-on element ( 1 ) according to claim 1 , wherein the padding ( 3 ) consists of the spacer fabric.
3 . The press-on element ( 1 ) according to claim 1 , wherein the spacer fabric comprises at least two woven textile surfaces ( 11 , 12 ), and/or the two woven textile surfaces ( 11 , 12 ) are connected to each other by pile threads.
4 . The press-on element ( 1 ) according to claim 1 , wherein the spacer fabric has a thickness tolerance of +/−5 hundredth of a millimeter.
5 . The press-on element ( 1 ) according to claim 1 , wherein the spacer fabric comprises moisture-stable synthetic fibers.
6 . The press-on element ( 1 ) according to claim 1 , wherein a compressive strength of the padding ( 3 ) is determined by a number of pile threads, a structure, a length and/or a thickness.
7 . The press-on element ( 1 ) according to claim 6 , wherein the spacer fabric is penetrated by the cooling medium, and/or a gas is employed as the cooling medium.
8 . The press-on element ( 1 ) according to claim 1 , wherein the cooling medium flows through the spacer fabric in a longitudinal and/or a transverse direction.
9 . A method for grinding wood or wood substitute materials, comprising: providing the press-on element ( 1 ) according to claim 1 ; and cooling the press-on element ( 1 ) during a grinding process by the cooling medium which flows through the padding ( 3 ).
10 . The method according to claim 9 , wherein the cooling medium is supplied and discharged via the sanding pad mounting ( 2 ).
11 . The method according to claim 9 , wherein a circulation or flow of the cooling medium is effected via the sanding pad mounting ( 2 ) through the padding.
12 . The method according to claim 9 , wherein the cooling medium is supplied and discharged under pressure.
13 . The method according to claim 9 , comprising: providing a constant flow of the cooling medium through the first chamber ( 14 ) of the sanding pad mounting ( 2 ) into the spacer fabric, and discharging the cooling medium through the further chamber ( 16 ) of the sanding pad mounting ( 2 ).
14 . The press-on element ( 1 ) according to claim 1 , wherein the padding ( 3 ) comprises the spacer fabric in a longitudinal and/or a transverse direction which is hemmed by edge strips of another padding material in the longitudinal and/or the transverse direction.
15 . A press-on element for a wide belt grinding machine, comprising: a backing material with a padding that at least partially comprises a spacer fabric; a sliding layer; and a sanding pad mounting having: at least one first chamber from which a cooling medium is supplied through at least one passage in the backing material into the spacer fabric, and at least one second chamber through which the cooling medium is discharged from the spacer fabric through a further at least one passage in the backing material.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is the U.S. national stage of International Application No. PCT/DE2022/200002, filed on 2022 Jan. 17. The international application claims the priority of DE 102021000350.0 filed on 2021 Jan. 25 and the priority of DE 102021001016. 7 filed on 2021 Feb. 25. BACKGROUND The invention relates to a press-on element for an abrasive belt, in particular for wide belt grinding machines, consisting at least of a backing material with a padding and a sliding layer. For calibration-grinding of large-surface workpieces, belt grinding machines, in particular wide belt grinding machines, are used in industry. In these belt grinding machines, a wide abrasive belt is driven by at least two rollers, the abrasive belt running along between the rollers on a grinding table. For pressing the abrasive belt flatly onto the workpiece, a press-on element is typically used. The press-on element here consists of a sanding pad device which is part of the belt grinding machine, and a sanding pad. The sanding pad device consists of a sanding pad mounting which serves to receive the sanding pad which is typically designed to be insertable into the sanding pad device. To reduce the wear of the abrasive belt on its back side and the sliding resistance, in prior art, a slideway lining is applied onto the sanding pad which permits the abrasive belt to be pressed onto the workpiece with little sliding resistance by the sanding pad. To achieve a uniform pressure of the abrasive belt on the flat workpiece, the sanding pad is padded, the padding layer being disposed between the sanding pad and the slideway lining. By the padding layer, the grinding pressure on slight elevations of the workpiece is higher than in small indentations in the surface of the flat workpiece. Thereby, an additional levelling of the workpiece surface is achieved. Another reason for employing a padding layer is that the closure of the abrasive belt has a material structure different from that of the rest of the abrasive belt due to the bonding at the fastening seam. During the passage of the abrasive belt closure through the grinding zone, mechanical impacts can thus occur which can be later clearly seen in the surface structure of the workpiece. The quality of the padding layer is therefore of great importance in the manufacture of the sanding pad. In prior art, for pressing the abrasive belt onto the workpiece, wide sanding pads are used onto which a padding layer is glued with the aid of an adhesive, on the surface of which in turn a fabric belt is applied which carries graphite parts on its surface. To prevent the slideway lining from being worn away from the sliding pad by shear forces exerted on the sanding pad device by the grinding operation, it is here necessary to fasten the slideway lining at the sides of the sanding pad. In the application of grinding machines in surface treatment, the pressing of the abrasive belt onto the workpiece is caused by a more or less flexible contact roller or via flat, usually padded press-on elements. The difference here is the substantially longer contact time of the abrasive grain during the flat pressure which naturally results in a better grinding result. As the demands on surface quality are increasing, above all, the correct choice of the shape and padding of the press-on element is decisive for a good grinding result. However, simultaneously, increased friction occurs due to the longer contact time, leading to an increase in temperature in the grinding zone which can even lead to a burning of the abrasive belt. This temperature rise leads to problems in the surface and can drastically reduce the running performance of the abrasive belt. Moreover, by the temperature differences, uncontrollable expansions in the metal parts of the machine important for pressing often occur, which additionally makes precise working more difficult. In general, for these reasons, one tries to keep the temperature as low as possible or to withdraw temperature from the grinding process. Press-on elements basically always consist of three components, i.e. the backing, the padding and the sliding layer, the padding being the decisive part having an influence on the grinding result. 1. The Backing: As backing materials, materials are suited which can assume bearing functions due to their own strength. They support and position the usually glued-on or clamped padding coating. For this, e.g. metals, wood materials, plastics, firm papers or the like are suited. When selecting the materials, apart from the price, other technical points of view are also important, such as e.g. load-bearing capacity, flexibility, processability, and disposal. 2. The Padding The tasks of the padding layer are, on the one hand, to cushion impacts that are caused by the connection point in the continuous abrasive belt and are visible as so-called chatter marks in the workpiece surface, and on the other hand, to compensat