EP1716972B1 - Pressure shoe layer - Google Patents

Abstract

A boot lining (101) has a slidable pressing surface (114) pressed against a sanding belt (5), and a lining carrier (111) of non-metallic or cellulose material such as timber, cotton, or polymer. The timber used may be selected from medium- or high-density fiberboard or other fiber-based material. The lining also forms an impact receiving surface slanted with respect to the pressing surface at an angle of 110 to 130 degrees, and a flexible slide layer (113). Independent claims are included for the following: (1) a method of manufacturing a boot lining; (2) a use of a material for a boot lining; and (3) a boot.

Description

The invention relates to a sanding pad, for use with a sanding shoe for pressing abrasive belts on workpieces in wide-belt sanding machines, which has at least one flat, padded and slippery contact surface, and a sanding pad for receiving a Schleifschuhbelags.

For grinding large-area workpieces, in particular of sheets of raw material, such as chipboard, MDF, HDF and OSB boards belt sanding machines are used in the industry. In these belt sanding machines, a wide abrasive belt is driven by rollers and pressed against the surface of the workpiece by a sanding shoe.

A sanding shoe has to meet several requirements. On the one hand, the friction between the sanding belt and the sanding pad must be as low as possible. Therefore, the sanding pad has a sanding pad which in operation is pressed against the sanding belt and therefore has a lubricious surface. The heat generated by the Anpressreibung should not affect the Schleifschuhbelag, therefore, a heat-resistant material is usually used.

On the other hand, even over the surface even pressure of the sanding pad should be ensured, even if the workpiece has slight elevations, get dirt particles between the grinding belt and Werkstückgelangen or unevenness in the sanding belt occur.

In general, the sanding pad is equipped with a padding of an elastic material, such as felt, foam or sponge rubber.

From the prior art sanding shoes are known in which a sanding pad is provided with a multi-layer sanding pad. Directly on the sanding pad, for example, there is an anti-slip coating, thereon an elastic padding material and finally a sliding coating is provided which contains, for example, graphite particles; The sliding lining is stretched over the elastic padding material and fastened laterally to the sanding pad with a clamping strip.

The assembly of such a sanding shoe is time consuming and requires a high level of craftsmanship. Since the entire sanding shoe has to be dismantled for a new assembly, this process usually takes place frequently per shift and independently of wear.

Overall, the use of such sanding shoes leads to high maintenance costs.

Out DE 2634829 For example, a sanding pad is known in which a tubular pad, elastic strip and cushioning mat form a printing element unit that can be slid into the sanding pad. A sliding lining is stretched over the open side of the sanding pad. The reassembly of the sanding pad is facilitated by the sliding pressure element unit, but remains complex because of the strained sliding coating.

Another variant of a sanding shoe is in DE 20315291 presented. The sanding pad has here a metallic support rail on which a sliding coating and a cushion layer is attached. The sanding pad can be pushed with the support rail in a corresponding recess of the sanding pad.

After replacement, however, the used sanding pad must be separated from the support rail and the rail must be newly bonded with a padding layer and a sliding layer.

In addition, the carrier rail is very good heat conducting, which leads to a rapid heating of the sanding pad.

The object of the invention is to avoid the disadvantages of the known, in particular so to create a sanding pad, which is simple in construction, based on inexpensive starting materials, inexpensive to manufacture and dispose of without effort. At the same time, the function in the wide-belt sanding machine is to be improved and the manageability for the personnel when replacing, reassembling and disposing should be facilitated.

Surprisingly, it has been shown that a lining carrier made of non-metallic material with sufficient strength and better function can be provided.

The object of the invention is achieved by a sanding shoe lining according to claim 1.

Non-metallic materials are usually poor heat conductors, so that the frictional heat generated during the grinding process is not absorbed by the Schleischuhbelag to a significant extent and may affect this, but is dissipated by the moving abrasive belt.

Non-metallic materials are usually based on inexpensive starting materials, are therefore inexpensive and require no further consideration in the disposal, since a recycling is not necessary.

The Schleifschuhbelag may have except the lining carrier made of non-metallic material fasteners made of metal, which can be easily removed from the sanding pad for disposal.

The lining carrier serves as a support element for the padding and the sliding surface. The cushioning material and / or the sliding surface may be glued to the lining carrier, welded, fixed with fastening elements or applied as an adhesive covering. Preferably, there is a surface connection, which withstands the shear forces occurring through the abrasive belt.

The lining carrier ensures that the elastic padding material and / or the sliding layer are not brought by the passing band from the intended position and establishes a connection of the Schleifschuhbelags to the sanding pad.

The sanding pad can be glued to the sanding shoe, clamped, fixed with or without additional fasteners or applied as an adhesive coating. According to the invention, the lining carrier can be pushed into a recess of the grinding shoe and fastened in a form-fitting manner.

In an advantageous embodiment of the invention, the lining carrier contains a cellulose material, in particular a wood material and / or a cotton material. In addition, other cellulosic materials are usable.

If the lining carrier is based on a natural base material, then it and, depending on the choice of upholstery or sliding material, the entire sanding pad must be disposed of without effort and thus used as a disposable sanding pad.

Cellulose materials are inexpensive, can be processed easily, they are variable in the shaping and it can be achieved a high dimensional stability, which make the cellulose materials suitable as a carrier material. In this case, the cellulose materials have a low density compared to similarly durable carrier materials and thus contribute to the fact that sanding pad coverings of low weight can be produced. A low weight facilitates assembly and transport.

The wood-based material and / or the cotton material is preferably a felt, an MDF, an HDF or a fibrous material, that is, open-minded cotton. The selection shows the great variability of the materials in terms of their strength or elasticity. The materials can be present in combination or alone.

According to the invention, the sanding shoe lining has at least one abutment surface for absorbing transverse forces, wherein the at least one abutment surface encloses an angle parallel to the contact surface with a plane. The stop surface can on the sanding pad or on abut a fastener to connect the sanding pad and sanding pad.

The angle between abutment surface and contact surface is less than 180 ° and greater than 90 °, preferably it is about 115 ° to 130 °.

The further the angle deviates from 90 degrees, the greater is the stop surface for a given thickness of the Schleifschuhbelags, that is at a given extent perpendicular to the contact surface.

The abutment surface absorbs the lateral forces acting on the sanding shoe lining by the running sanding belt and passes them on to the sanding pad. The lateral forces are distributed better the larger the stop surface. The abutment surfaces simultaneously cause a positive connection between the sanding shoe lining and the sanding shoe.

According to the invention, the sanding shoe lining has stop surfaces on the end facing the running direction of the sanding belt and facing away from the running direction of the sanding belt.

The abutment surfaces at one end of the sanding pad can be an area in a plane or composite abutment surfaces, such as a T-profile. However, this does not distribute the lateral forces very evenly on the stop. It can come at the transitions between the surfaces to undesirable voltages.

Preferably, the cross section of the Schleifschuhbelags on a dovetail-shaped profile. This directs the forces evenly into the sanding shoe.

Shear stresses on material transitions can be avoided if the sanding shoe lining comprises a lining carrier whose cross-section has a dovetail-shaped profile. The stop surface is largely or completely formed by the lining carrier. In particular lining carrier made of dimensionally stable material are able to absorb the forces without internal stresses.

In an advantageous embodiment, the stop surface of the dovetailed profile encloses an angle of 110-130 degrees, preferably 120 degrees, with the plane of the contact surface. In this case, the profile on the inside of the dovetail-like projections on a 60 degree angle.

On the so-inclined stop surface, the resulting transverse forces are optimally absorbed.

In a further advantageous embodiment of the invention, the sanding pad as an inlet surface for the sanding belt on at least one inclined portion in a direction away from the sanding pad surface, in which the surface is not parallel to the contact surface, but with this encloses an angle. The bevel area may be formed as a flat surface, but it may also have a rounded or faceted surface.

For the grinding result, it is important that the grinding shoe has a sufficiently large contact surface, which is positioned according to the surface of the workpiece or the grinding table.

The surface of the sanding pad is particularly exposed to the forces generated by the moving sanding belt. Since the sanding pad presses the sanding belt against the workpiece, the contact surface and the sanding belt enclose an angle in the edge regions. The load on the sanding pad by the sanding belt can be reduced if the shape of the sanding pad is adapted to the entry angle.

Since similar effects also occur when the abrasive belt runs away from the sanding shoe, it is advantageous if the inclined region is formed as a discharge ramp for pressing an abrasive belt running away from a workpiece.

Preferably, therefore, the sanding pad has an outlet and an inlet slope.

The design of the tapered region depends on the arrangement of the wide-belt sanding machine, on the spacing of the drive rollers, the elasticity of the sanding belts and others.

For conventional wide-belt sanding machines, it is advantageous if the at least one bevel area encloses an angle of 4-10 degrees with the contact surface or the grinding plane.

The contact pressure in the edge areas can be adapted particularly well to the requirements in individual cases, if the lining carrier consists of dimensionally stable material and is even beveled in the edge region.

According to the invention, a padding layer is provided on the lining carrier which, at least in the region of the contact surface, is provided with a lubricious material is. Preferably, the lubricious material is also provided in the edge regions, so that the entire contact surface to the grinding belt has sufficient lubricity.

In the layered design can be used for the cushion layer and the lubricious material covering layers, which have already proven in abrasive shoes, which are known from the prior art.

In an advantageous embodiment of the invention, the sanding pad is provided with a cushioning material, which at least on a part of its thickness with a sliding material, preferably graphite or a graphite compound, interspersed. The thickness of the cushioning material denotes the extent perpendicular to the contact surface.

Padding material usually has an open-pore structure with a large surface area at which the sliding material can settle. The padding material can also have components that guarantee sufficient lubricity. In both cases, there is a padding material that provides a lubricious contact surface.

The cushioning material is preferably a foam, in particular a PU foam, and / or a felt. Foams and felts have proven to be upholstery materials and can be combined well with lubricants.

Alternatively, a sliding material is conceivable which has elastic properties by means of suitable additives or carrier materials.

The object of the inventive task is further solved by a sanding pad according to claim 11.

Sanding pad and sanding pad allow a short changeover time and easy interchangeability.

The inventive abrasive shoe absorbs the forces occurring over the stop surfaces in the recesses, that is, the forces are transmitted to the body of the sanding pad and not on any retaining elements, which gives the entire sanding shoe stability.

The grinding shoe has a recess with a base surface, which preferably runs parallel to the contact surface or contact surface and against which the sanding shoe lining rests.

In an advantageous embodiment of the invention, the stop surface of the dovetail-shaped profile with respect to a plane parallel to the contact surface, for example, the base surface, at an angle of 40-70 degrees, preferably 60 degrees, arranged.

Figur 1

eine schematische Schnittdarstellung einer Bandschleifmaschine mit einer Schleifschuh,

Figur 2

eine schematische Schnittdarstellung eines Schleifschuhs mit einem ersten Beispiel für einen Schleifschuhbelag,

Figur 3

eine schematische Seitenansicht eines zweiten Beispiels für einen Schleifschuhbelag,

Figur 4

eine schematisches Schnittdarstellung eines dritten Beispiels für einen Schleifschuhbelag,

Figur 5

eine schematische Schnittdarstellung eines vierten Beispiels für einen Schleifschuhbelag,

Figur 6

eine schematische Schnittdarstellung eines fünften Beispiels für einen Schleifschuhbelag,

Figur 7a, 7b

schematische Schnittdarstellungen zweier weiterer Beispiele für Schleifschuhbeläge,

Figuren 8a,

eine schematische Schnittdarstellung eines Beispiels für eine Gleitschicht

The invention is explained in more detail below in exemplary embodiments with reference to drawings. Show it:

FIG. 1

a schematic sectional view of a belt grinding machine with a sanding pad,

FIG. 2

FIG. 2 a schematic sectional view of a sanding pad with a first example of a sanding shoe lining, FIG.

FIG. 3

a schematic side view of a second example of a Schleifschuhbelag,

FIG. 4

a schematic sectional view of a third example of a Schleifschuhbelag,

FIG. 5

a schematic sectional view of a fourth example of a Schleifschuhbelag,

FIG. 6

FIG. 2 is a schematic sectional view of a fifth example of a sanding shoe lining. FIG.

Figure 7a, 7b

schematic sectional views of two further examples of Schleifschuhbeläge,

FIGS. 8a,

a schematic sectional view of an example of a sliding layer

FIG. 1 shows a schematic sectional view of a belt grinding machine 1 with a sanding pad 2 in section.

A workpiece 3 is conveyed on a grinding table 4 under a rotating grinding belt 5. The grinding belt 5 is driven by three drive rollers 6 in a running direction 7 and pressed by the grinding shoe 2 against the workpiece.

FIG. 2 shows the sanding pad 2 with a carrier 8 and a Schleifschuhbelag 101. The Schleifschuhbelag 101 has a lining carrier 111 made of MDF, on which a padding layer 112 is glued. On the cushion layer 112, a sliding layer 113 is glued.

A carrier 8 is provided with recesses 9 for attachment to the belt grinding machine and recesses 10, in which the lining carrier 111 of the Schleifschuhbelags 101 can be inserted.

The cushioning layer 112 is provided only in the region of the contact surface 114. In the first edge region 115, at which the sanding belt 5 abuts the sanding shoe lining 101, and in the second edge region 116, at which the sanding belt runs away from the sanding shoe lining 101, the lining carrier 111 is covered only by the sliding layer 113.

FIG. 3 shows a schematic side view of a second embodiment of a Schleifschuhbelag 201, which also consists of layers of a lining carrier 211 with dovetail profile 217, a cushion layer 212 and a sliding layer 213. The padding layer 212 is bevelled on both sides and forms an inlet bevel 218 and an outlet bevel 219.

FIG. 4 shows a schematic representation of another embodiment of a Schleifschuhbelag 301, which also has a lining carrier 311 with dovetail profile 317, a cushion layer 312 and a sliding layer 313. The cushioning layer 312 and the sliding layer 313 cover the inlet bevel 318 formed on the lining carrier 311 and the corresponding outlet slope 319.

The lining carrier 311 has stop surfaces 320 for absorbing transverse forces.

The lining carrier 311 is made of an MDF board. The dovetail-shaped profile 317, the inlet slope 318 and the outlet slope 319 are milled.

FIG. 5 shows a schematic sectional view of a fourth example of a Schleifschuhbelag 401, the layers of a consisting of HDF lining carrier 411 dovetailed Profile 417, a cushion layer 412 and a sliding layer 413 is.

FIG. 6 shows a schematic sectional view of a fifth example of a Schleifschuhbelag 701th

In the figure, the included angle of the respective surfaces are explained.

The bevel regions 722 enclose an angle A of preferably 6 degrees with the swept plane 723.

The stop surfaces 720 close with the contact surface 714 an angle B of preferably 120 degrees.

FIGS. 7a and 7b show schematic sectional views of two further examples of Schleifschuhbeläge 801a, 801b.

In one example of a shoe pad 801a, pad backing 811a has a rounded abutment surface 820a and a rounded run-off slope 819a. The recess 810a in the carrier 808a has a corresponding shape.

In another example of a sanding pad 801b, the backing 811b has a first beveled abutment surface 820b and a second abutment surface 820b 'in the direction of travel 807 of the abrasive belt, not shown, which transfers the force transmitted by the abrasive belt in the direction of travel 807b to the backing 808b. On the side 827 facing away from the running direction 807b, a non-beveled abutment surface 820b ", to which the sanding shoe lining 801b is fastened by means of a connecting element 828 to the support 808b.

MDF or HDF or chipboard are particularly suitable as wood-based material.

Above all, MDF (Medium Density Fiber Plates) with a density of 750 to 950 kg / m ³ and a UF or MUF bond are particularly suitable. These panels are available in standardized DIN 622 part 5 design from manufacturers such as Kronospan, CH-Menznau, or Kaindl, AT-Salzburg, under the name Standard MDF (eg Flooring). MDF boards can preferably be used in a thickness of 3 to 6 mm as a lining carrier. Thicknesses of 4.4 to 5 mm are particularly suitable.

Also fiber material, so in open sulfuric acid open cotton fibers are well suited as a material. Fiber material is available under the name Vulkanfiber or Dynos-Fiber at Sachsenröder, D-Wuppertal or Troplast AG, D-Troisdorf. Fiber material can be used to advantage in thicknesses of 0.38 mm to 2.0 mm.

As a further material, plastics are suitable as Materila for the lining carrier. There are various thermoplastics such as PES, PET, PA, ABS, all in filled and reinforced form.

Likewise thermosets such as Epoxies, amino resins or phenolic resins. As typical trade names you can add Corean, Varior or Resocel.

Hereinafter, various embodiments of cushioning and sliding layers are described, which can be advantageously used in the invention.

As padding material, for example, felt pads in a thickness of 3 to 4 mm, preferably from 3 to 3.5 mm. The felt preferably has a volume weight of about 0.2 to 0.7 g / cm ³ . It is available, for example, under the name wool felt from VFG, D-Giengen; the felt can be glued to the lining carrier eg by means of PU glue.

In FIG. 8a Shown schematically is a cushioning layer 912 coated with a sliding layer 929.

In order to make the felt, which serves as a cushioning layer, lubricatable, it can be filled, for example, with a graphite binder mixture at least on the contact surface in such a way that the contact surface has sliding properties. The graphite material can be obtained from Graphit Kropfmühl AG, D-Hauzenberg. When put into the felt together with a binder such as latex, acrylate or PUR, the felt is sufficiently filled. Instead of a felt, a fleece can be used for this application. Needle nonwovens such as those produced by sia Fibral or chemically bonded nonwovens can be produced, for example, by Resintex, IT-Milan.

Alternatively, it is also conceivable to use the lubricant, e.g. Graphite with a binder, e.g. a liquid polyurethane adhesive or a latex or acrylate adhesive and apply this layer directly on the cushion layer (for example, a felt layer or a foam layer). These techniques are well known in the art because so far the slip layers are applied to textile ribbons and these are stretched over the cushion layers or bonded to the cushion layers. Deviating, the invention proposes accordingly, instead of a separate textile carrier layer directly to coat the pad layer with lubricant.

Claims (12)

1. Sanding pad covering for use on a sanding pad (2) for pressing a sanding belt (5) against a workpiece in a wide belt sanding machine (1), said sanding pad covering having at least one slidable pressure surface (114), wherein the sanding pad covering (101; 201; 301; 401; 701; 801a, 801b) has a covering support (111; 211; 311; 411, 811a, 811b), wherein the covering support (111; 211; 311; 411, 811a, 811b) has stop surfaces (320; 420; 820a, 820b, 820b', 820b") for absorbing transverse forces, wherein the stop surfaces (320; 420; 820a, 820b, 820b', 820b") enclose an angle (B) with a plane parallel to the pressure surface (114) and wherein the stop surfaces (320; 420; 820a, 820b, 820b', 820b") are arranged on the end facing in the running direction of the sanding belt (5) and on the end facing against the running direction of the sanding belt (5), wherein a cushion layer (112; 212; 312; 412; 912) is provided on the covering support (111; 211; 311; 411, 811a, 811b), said cushion layer (112; 212; 312; 412; 912) being covered with a slidable layer (929) at least in the region of the pressure surface (114, 714), characterized in that the covering support (111; 211; 311; 411, 811a, 811b) consists of non-metallic material.
2. Sanding pad covering according to Claim 1, characterized in that the covering support (111; 211; 311; 411, 811a, 811b) contains or consists of a cellulose material, in particular a wooden material and/or a cotton material and/or a polymer material.
3. Sanding pad covering according to Claim 2, characterized in that the wooden material and/or the cotton material contains or consists of MDF, HDF or a fibre material.
4. Sanding pad covering according to one of the preceding claims, characterized in that the cross section of the sanding pad covering (101; 201; 301; 401; 701; 801a, 801b) has a dovetailed profile (217; 317; 417).
5. Sanding pad covering according to one of the preceding claims, characterized in that the at least one stop surface (320; 420; 820a, 820b, 820b', 820b'') encloses an angle (B) of 110-130 degrees, preferably 120 degrees, with the plane of the pressure surface (114).
6. Sanding pad covering according to one of Claims 1 to 5, characterized in that the sanding pad covering (101; 201; 301; 401; 701; 801a, 801b) has at least one sloping region (722) in a surface pointing away from the sanding pad, in which sloping region (722) the surface does not run parallel to the pressure surface (114; 714) but rather encloses an angle (A) with the latter.
7. Sanding pad covering according to Claim 6, characterized in that the sloping region (722) is designed as an entering slope (218; 318; 418) for pressing against a sanding belt (5) running towards a workpiece (3).
8. Sanding pad covering according to either of Claims 6 and 7, characterized in that the sloping region (722) is designed as a leaving slope (219; 319; 419) for pressing against a sanding belt (5) running away from a workpiece (3).
9. Sanding pad covering according to one of Claims 6 to 8, characterized in that the at least one sloping region (722) encloses an angle (B) of 4-10 degrees with the sanding plane (723).
10. Sanding pad covering according to one of Claims 6 to 9, characterized in that the at least one sloping region (722) is formed on the covering support (111; 211; 311; 411; 811a, 811b).
11. Sanding pad having a sanding pad covering according to one of Claims 1 to 10, characterized in that the sanding pad (2) comprises a support (8) which has recesses (10), the cross section of which has a dovetailed profile.
12. Sanding pad according to Claim 11, characterized in that the stop surface of the dovetailed profile is arranged at an angle of 40-70 degrees, preferably 60 degrees, relative to a plane parallel to the pressure surface.

Images