WO2000078506A1

WO2000078506A1 - Tool holder

Info

Publication number: WO2000078506A1
Application number: PCT/EP2000/005796
Authority: WO
Inventors: Gerd Eisenblätter
Original assignee: Gerd Eisenblätter Gmbh
Priority date: 1999-06-22
Filing date: 2000-06-23
Publication date: 2000-12-28
Also published as: EP1741516B1; DE50014059D1; ATE353739T1; EP1741516A1; ES2476795T3; EP1105252A1; DE29910931U1; EP1105252B1; ES2280228T3

Abstract

The invention relates to a fiber-reinforced rotationally symmetrical tool holder (7), a production method and a grinding tool. The tool holder (7) can be detachably connected to a rotational drive mechanism and has a tool support surface (9) for receiving a grinding, roughing and/or polishing element (5). The tool holder (7) and the grinding tool (5) are provided with a fiber reinforcement consisting at least partially of natural fibers (31).

Description

Tool carrier

The invention relates to a fiber-reinforced, rotationally symmetrical tool carrier, a tissue carrier for grinding and polishing fabrics and a grinding and polishing fabric according to the preambles of the independent claims. The invention further relates to a manufacturing method according to the preamble of the independent method claim.

A fiber-reinforced, rotationally symmetrical tool carrier can be detachably connected to a rotary drive and also has a tool contact surface for receiving at least one grinding and / or polishing element.

In the case of a material processing tool with a fiber-reinforced, rotationally symmetrical tool carrier, which can be detachably connected to a rotary drive and has a tool contact surface, at least one grinding and / or polishing element is received on the tool contact surface.

The rotationally symmetrical tool carrier can, for. B. be a circular disc or a cylindrical roller.

A material processing tool can be, for example, flap grinders, flap grinding brushes or rollers, grinding discs, cutting discs, polishing discs, etc.

Such material processing tools are used wherever surfaces of any material are to be processed, smoothed, polished and / or modeled. More generally formulated where material has to be removed from a workpiece. These tools are wear parts that are manufactured and consumed in large quantities.

Sufficiently known are material processing tools which consist of a rotationally symmetrical tool carrier on which grinding and / or polishing elements are applied. The grinding and / or polishing elements can, for example, be felt polishing bodies, grinding or polishing fleece, abrasive cloth and the like. In the known material processing tools, the tool carrier is made of plastic in a compact, rigid and rigid manner, fiber reinforcements, for example glass fiber reinforcements, also being used. When using such material processing tools, there can be considerable temperature increases due to the frictional heat. This also increases the temperature of the tool holder, reducing its strength and thus its mechanical strength.

Against this background, it is a task of the present invention to specify the objects mentioned at the outset and a production method therefor which have simple mechanical and thermal properties with simple manufacture and, moreover, can be disposed of in an unproblematic manner.

This object is achieved in terms of device and method with the characterizing features of the independent claims. Preferred developments are described in the dependent claims.

In the case of a fiber-reinforced, rotationally symmetrical tool carrier, which can be detachably connected to a rotary drive and is provided with a tool contact surface for receiving at least one grinding and / or polishing element, the invention provides that the fiber reinforcement consists at least partially of natural fiber.

Accordingly, in a material processing tool according to the invention of the type described above, it is provided that the tool carrier is at least partially made of natural fibers.

Furthermore, a rotationally symmetrical blank for further processing into a tool carrier is made according to the invention from a fiber mat which at least partially consists of natural fibers and is mixed with a binder for natural fibers. Advantageous developments of the invention are claimed in the subclaims.

A key concept of the invention can be seen in the fact that the tool carrier of the material processing tool is made of plastic instead of previously, and thus essentially of renewable raw materials.

This initially results in a significantly less problematic disposal. For example the carbon dioxide balance in combustion is practically balanced by using renewable raw materials. Other disposal options such as composting are also possible.

It has surprisingly been found in the invention that the tool carriers made from materials with natural fibers have very good thermal and mechanical properties. Another positive aspect of the invention is that the natural fiber materials are relatively inexpensive to obtain and process today.

The tool carrier or the objects described at the outset obtain particularly good mechanical and thermal properties when the fiber reinforcement is strengthened by binders. The binder can be in the commercially available forms, e.g. as a suspension or solid as a powder or granules, single or multi-component binders are suitable. Organic or inorganic binders can be used. Examples are phenolic resins, styrene resins, polycarbonates or polyolefins, such as in particular polypropylene. A fiber fabric, such as a hemp, flax and / or sisal knitted fabric, which is permeated with a solid binder, can be pressed to the final shape under increased pressure and at elevated temperature. The binder melts, spreads out in the fiber fabric, and a product of high stability and tear resistance is created. The proportion of natural fibers can be between 50% and 85%, preferably in the range from 70% to 80%.

In a further preferred embodiment variant, the tool carrier is made entirely of natural materials. This makes disposal particularly unproblematic. Cellulose materials, for example, can be used as binders.

Preferred embodiments of the tool carrier are characterized in that the natural fibers consist of one or more of the materials hemp, flax or sisal.

These materials are now produced in large quantities again for agricultural purposes, are therefore correspondingly inexpensive and also have favorable processing and strength properties.

In a particularly preferred embodiment, the tool carrier is made from a granulate. Which has the components of natural fibers and polypropylene. The production with Granules are particularly simple and inexpensive. The granules are melted, as is known, for example, from plastic injection molding technology, and injected into appropriate molds, the granules each consisting of 50% natural fibers and polypropylene in a particularly suitable mixture.

A preferred development of the material processing tool according to claim 8 is that the grinding and / or polishing element is also at least partially made of natural fibers. This in turn is advantageous with regard to the environmentally friendly disposal of the used material processing tool.

The invention is further explained below with the aid of examples which are shown schematically in the drawing. Show it:

Figure 1 is a partially sectioned plan view of a sander.

2 is a partially sectioned perspective view of a grinding wheel, which is also referred to as a mop wheel;

3 shows a partially sectioned perspective view of a roller-shaped tool carrier in connection with an endless grinding belt;

4 shows a longitudinal sectional illustration of a grinding tool;

FIG. 5 shows a view of a fabric carrier covered with grinding flaps as a detail of the grinding tool according to FIG. 4; and

Fig. 6 is a perspective view of a plate-shaped base body for the production of tools or tool carriers.

In Figure 1, a flap disc 1 is shown, which consists of a tool holder 7 and fan-shaped grinding elements 5 (grinding flaps). The tool holder 7 also has a circular shape, the outer edge of the tool holder 7 being visible only in a small angular segment in the view shown here. In the center of the circle of the tool carrier 7, an opening 3 is incorporated, which serves to connect the flap disc 1 to a rotary drive. The tool carrier 7 is made from a hemp / polypropylene granulate. The natural fibers 31 are shown schematically in FIG. 1. The tool carrier 7 has a tool contact surface 9 on which a plurality of grinding elements 5 are attached in a fan-like manner. is arranged. In a small angle segment, however, the grinding elements 5 are omitted for the sake of illustration.

Figure 2 shows a so-called Moprad 1 1, which has a roller-shaped tool carrier 15 with radially arranged grinding elements 1 7 (grinding flaps). In the example shown, an axis 19 is inserted in the center of the tool carrier 15, via which the mop wheel 11 can be connected to a drive. In this exemplary embodiment, the tool support surface 21 is the outer surface of the cylinder, the grinding elements 17 being attached to the outer surface and projecting radially from the tool carrier 15. The tool carrier 15 is also made from a natural fiber / binder granulate. In a partial segment of the circular cylinder, the grinding elements 17 are omitted for the sake of illustration in order to illustrate the tool contact surface 21. In addition, a partial area is shown broken away and the natural fibers 31 are indicated schematically.

FIG. 3 shows a roller-shaped tool carrier 23, on the tool support surface 25 of which an endless grinding or polishing belt rolls off during operation. The tool carrier 23 has an axial opening 29, which is used for connection to a rotary drive (not shown). A section of the tool carrier 23, which in turn is produced from a natural fiber / binder granulate, has broken away in the illustration chosen in FIG. 3 and the natural fibers 31 are indicated schematically. In the embodiment shown here, the grinding element, i. H. the endless grinding belt 27 is not received by the tool support surface 25, as in the exemplary embodiments shown in FIG. 1 and FIG. 2, by means of a material connection, but by means of a non-positive connection.

1 and 2 consist of a fabric made of natural fibers such as hemp, sisal or flax, which is coated with abrasive grain on the working side. The abrasive cloth is impregnated in a manner known per se, for example from phenolic resins, and e.g. sprayed with urea so that the abrasive grain adheres well.

In the same way, the abrasive belt 27 according to the example in FIG. 3 also consists of a woven fabric made of natural fibers with an abrasive grain. 4 and 5, the grinding tool comprises a disk-shaped tool carrier 10, a separate fabric carrier 26, which can be detachably attached to the tool carrier 10, and radially aligned grinding flaps 16 mounted thereon. The basic material for tool carriers 10, fabric carrier 26 and grinding flaps 16 are each natural fibers that are processed and adapted differently depending on the intended use.

The end face of the tool carrier 10 is provided with micro hooks 12, which are also referred to as Velcro hooks. They interact with a support 30 made of loose threads as a so-called Velcro fastener, so that the tissue carrier 26 can be easily attached to or removed from the tool carrier. On the side of the fabric carrier 26 opposite the support 30, the natural fibers are provided with an impregnation which improves the adhesive connection with the grinding flaps 16.

The tissue carrier 26 covered with grinding lamella 16 is thus an object which, after the grinding lamella 16 has worn, can be replaced by a new tissue carrier occupied by unused grinding lamella 16, while the tool carrier 10 can be retained in order to conserve resources.

5 illustrates a phase of the manufacturing process for disk-shaped tools 60. A plate-shaped base body 61 is produced from a pulp made of natural fibers and binding agents as well as homogeneously distributed abrasive grain. It is then pressed under increased pressure and at elevated temperature, the blanks 62 of the tools being shaped and pressed next to one another. The blanks 62 receive the final shape and strength of the end product. The blanks 62 are punched out in a final punching process. Thanks to the integrated abrasive grain, these tools can be used as cutting discs, for example.

Additionally or alternatively, tools produced in this way can be covered with abrasive grain on their end face after punching out, so that they can be used for grinding, roughing or polishing surfaces.

Tool carriers according to FIGS. 1 and 4 can be produced in the same way as illustrated in FIG. 6.

Claims

claims

1. Fiber-reinforced, rotationally symmetrical tool carrier, which can be releasably connected to a rotary drive, with a tool contact surface (9; 21; 25) for receiving at least one grinding and / or polishing element (5; 17; 27), characterized in that the fiber reinforcement is at least partially made of natural fibers (31) exists.

2. Tissue carrier for abrasive and polishing fabric, characterized in that it is at least partially made from natural fibers.

3. Abrasive or polishing fabric, characterized in that it is made at least partially from natural fibers (31).

4. Grinding or polishing tool with integrated abrasive grain, characterized in that it is at least partially made of natural fibers (31).

5. Object according to one of the preceding claims, characterized in that the natural fibers (31) are solidified by a binder

6. Article according to claim 5, characterized in that the binder is a synthetic resin.

7. Object according to one of the preceding claims, characterized in that the natural fibers (31) consist of one of the several of the materials hemp, flax, or sisal.

8. An article according to any one of the preceding claims, characterized in that it is made from granulate which has natural fibers (31) and binders as components.

9. blank for further processing to a rigid and rigid tool carrier (7; 15; 23) according to any one of claims 1 to 7, characterized in that it is made of a fiber mat which at least partially consists of natural fibers (31) and with a binder for the natural fibers (31) is offset.

10. Production method for a tool carrier and a grinding or polishing tool according to one of claims 1 or 4, characterized in that it produces a pulp from natural fibers and binders, that plate-shaped base bodies are produced from the pulp, that the base bodies in the Were pressed and shaped by means of a pressing tool in such a way that several blanks are formed next to one another and that the blanks are then punched out.

11. The method according to claim 10, characterized in that the associated pressing tool surface is designed to be correspondingly smooth in order to produce a smooth surface.

12. The method according to claim 10 or 11, characterized in that the pulp abrasive grain is fed and distributed homogeneously, so that the abrasive grain is evenly distributed in the objects produced therefrom.