Pressing Element for a Grinding Belt, with Cooling

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.

Claims

1. 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), characterized in that the padding (3) at least partially consists of a spacer fabric.

2. Press-on element (1) according to claim 1, characterized in that the padding (3) completely consists of a spacer fabric, or the padding (3) includes a spacer fabric in the longitudinal and/or transverse direction which is hemmed by edge strips of another padding material in the longitudinal and/or transverse direction.

3. Press-on element (1) according to claim 1, characterized in that the spacer fabric consists of at least two loosely woven textile surfaces (11, 12), and/or the textile surfaces (11, 12) are connected to each other by pile threads.

4. Press-on element (1) according to claim 1, characterized in that the spacer fabric has a low thickness tolerance, and/or the thickness tolerance is +/5 hundredth of a millimeter.

5. Press-on element (1) according to claim 1, characterized in that the spacer fabric consists of moisture-stable synthetic fibers.

6. Press-on element (1) according to claim 1, characterized in that a compressive strength of the padding (3) can be determined by the number of pile threads, the structure, length and/or thickness.

7. Press-on element (1) according to claim 6, characterized in that the spacer fabric can be penetrated by a cooling medium, and/or a gas can be employed as the cooling medium.

8. Press-on element (1) according to claim 1, characterized in that the cooling medium penetrates, via a first chamber of the sanding pad mounting of the wide belt grinding machine, through at least one first passage, the spacer fabric, and, after it has flown through the spacer fabric, exits through at least one second passage into a further chamber of the sanding pad mounting.

9. Press-on element (1) according to claim 1, characterized in that the cooling medium flows through the spacer fabric in the longitudinal and/or transverse direction.

10. Method for grinding large-surface materials, in particular wood or wood substitute materials, using a press-on element (1) for an abrasive belt (30), characterized by cooling the press-on element (1) during the grinding process by a cooling medium which flows through the padding (3) of the press-on element (1).

11. Method according to claim 10, characterized in that the cooling medium is supplied and discharged via the sanding pad mounting (2).

12. Method according to claim 10, characterized in that a circulation or flow of the cooling medium is effected via the sanding pad mounting (2) through the padding.

13. Method according to claim 10, characterized in that the cooling medium is supplied and discharged under pressure.

14. Method according to claim 10, characterized in that a constant flow of the cooling medium is effected through at least one first chamber (14) of the sanding pad mounting (2) into the spacer fabric, and the discharge of the cooling medium is effected through at least one second chamber (16) of the sanding pad mounting (2).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In the drawings:

[0039] FIG. 1 shows a sectional representation of a press-on element, and

[0040] FIG. 2 shows, in a perspective view, the press-on element with an abrasive belt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] FIG. 1 shows a press-on element 1 with a sanding pad mounting 2, a padding 3, and a sliding layer 4.

[0042] The sanding pad mounting 2 has a nearly rectangular cross-section with two chamfers 5, 6 and an upper, T-shaped groove 7 on the opposite side of the chamfers 5, 6. Between the chamfers 5, 6, there is a second T-shaped groove 9 which is provided for connecting them with a non-depicted grinding machine. The T-shaped groove 7 in turn serves to receive a backing material 10. The backing material 10 is first of all provided with a padding 3 on the upper side which projects from the sanding pad mounting 2, a sliding layer 4 being furthermore applied onto the padding. The sliding layer 4 can consist, for example, of a graphite layer or a graphite woven. The backing material 10 can consist, for example, of wood, plastic, or metal. The lower surface of the backing material 10 includes two tongues 27, 28 which engage with the groove 7 of the sanding pad mounting 2. By the T-groove 7 and the two tongues 7, 8, a firm connection between the backing material 10 and the sanding pad mounting 2 is achieved, whereby the occurring forces by the grinding process are absorbed by the groove 7.

[0043] In accordance with the present invention, the padding 3 consists of a spacer fabric with two loosely woven textile surfaces 11, 12 which are connected to each other by pile threads, so that the spacer fabric is permeable for a cooling medium.

[0044] The sanding pad mounting 2 furthermore includes a plurality of chambers 13, 14, 15, 16, 17 which are predetermined by the extruded profile, wherein the chamber 14 can be used for supplying a cooling medium, and the chamber 16 can be used for discharging the cooling medium. The cooling medium flows, according to the arrow structure 18, from the chamber 14 through at least one bore 19, 20 of the sanding pad mounting 2, and at least one passage 23, 24 of the backing material 10 into the padding 3, and from the latter via at least one passage 25, 26 of the backing material 10 and at least one bore 21, 22 into the chamber 16, so that a continuous flow of the cooling medium through the padding 3 is given, and a cooling of the padding 3 and the sliding layer 4 is possible during the grinding process.

[0045] FIG. 2 shows the press-on element 1 in connection with an abrasive belt 30 in a perspective view. It is a schematic view to better represent the arrangement of the individual components, wherein in particular the abrasive belt 30 has a substantially larger width and is shown with a reduced width for a better understanding to illustrate the position of the press-on element 1 with the further components. The abrasive belt 30 is designed as a continuous belt and is guided over and driven by deflection rollers 31, 32. On the side facing to the outside, the abrasive belt 30 is coated with an abrasive material, such as corundum, to work the not represented workpieces. The perspective view in this case shows an arrangement in which the abrasive belt 30 is pressed against the workpiece from below, wherein in a wide belt grinding machine, two of such abrasive belts can be employed which can work the workpiece simultaneously from above and from below.

[0046] The press-on element 1 with the sanding pad mounting 2, the padding 3 and the sliding layer 4 extends transversely to the abrasive belt 30. Both the padding 3 and the sliding layer 4 are only partially represented for illustration purposes. Normally, the padding 3 and the sliding layer 4 extend across the complete length of the press-on element 1 to press the abrasive belt against the workpiece over a large surface. The structure of the press-on element 1 corresponds to that of FIG. 1, wherein from the perspective view, the bores 19, 20, 21, 22 of the sanding pad mounting 2 which are arranged distributed across the complete length of the grinding press-on element 1 and are clearly visible. Furthermore, the passages 23, 24, 25, 26 of the backing material 10 corresponding to the bores 19, 20, 21, 22 can be seen. Via the chamber 14 of the sanding pad mounting 2, the cooling medium can be supplied, and discharged via the chamber 16, wherein the cooling medium gets from the chamber 14 via the bores 19, 20 and passages 23, 24 into the padding 3, and via the further passages 25, 26 and bores 21, 22 into the chamber 16 of the sanding pad mounting 2, so that the cooling medium, for example air, can flow through the padding 3 under pressure. The flow velocity can be accelerated by corresponding measures, such as for example pressure-increasing devices.

[0047] The padding 3 itself has no passages and is sealed to the outside by the sliding layer to such an extent that a flow can only occur within the padding 3.

LIST OF REFERENCE NUMERALS

[0048] 1 press-on element [0049] 2 sanding pad mounting [0050] 3 padding [0051] 4 sliding layer [0052] 5 chamfer [0053] 6 chamfer [0054] 7 groove [0055] 8 narrow side [0056] 9 groove [0057] 10 backing material [0058] 11 textile surface [0059] 12 textile surface [0060] 13 chamber [0061] 14 chamber [0062] 15 chamber [0063] 16 chamber [0064] 17 chamber [0065] 18 arrow structure [0066] 19 bore [0067] 20 bore [0068] 21 bore [0069] 22 bore [0070] 23 passage [0071] 24 passage [0072] 25 passage [0073] 26 passage [0074] 30 abrasive belt [0075] 31 deflection roller [0076] 32 deflection roller