JP2003515003A - Method of making a workpiece for mechanically processing a fiber material suspension - Google Patents

Abstract

(57) Abstract According to the method of the present invention, the actual working element (2) and the basic body (1) are manufactured separately, they are put together and then firmly connected to each other to form a paper fiber material. A processing member for processing is manufactured. The basic body (1) is formed from a fiber reinforced plastic having special thermal expansion properties. Particularly suitable for the process according to the invention are beating parts and subdivided parts.

Description

Detailed Description of the Invention

The present invention relates to a method for producing a machined member of the type described in the preamble of claim 1.

The work piece thus produced serves to mechanically treat the suspended fibrous material. In this context, in particular beating of the paper fibers means, in short, changes in fiber properties such as length, flexibility or surface. The processed member is incorporated in, for example, a beater so-called refiner. In this case, the refiner suspension is about 2-8.
It has a solids content of%, more on special machines. In such machines for high material densities, beaters are called, for example, high-density refiners, disintegrators (Dispaegern) or kneaders (Knetern). A typical machine comprises at least one rotor having a disk-shaped or conical surface and at least a stator, on which a work piece is mounted, so that a gap is formed between these components. It Many work pieces have a web and a groove on the work surface and are therefore also referred to as cutter work pieces. In addition to such web shapes, materials are also known which have an effect on the treatment of fibrous materials.

Work pieces are exposed to wear and therefore need to be replaced at predetermined intervals. Furthermore, wear can lead to a change in the treatment effect during the service life. That is, the shape and the surface of the processed member have a great influence on the processing effect.

Therefore, it takes a considerable amount of time to develop a processed member, and such a trouble occurs in the shape of the processed member and the material selection. Materials which are particularly suitable for the working element in this case have properties such that, when used, they can be a major problem for the basic body of the working member.

In particular, extremely hard and brittle materials, such as ceramics, do not have the viscosity required for the basic body. Moreover, such materials are relatively expensive, costly to fabricate, and cannot be processed with much less effort than common metallic materials.

The basic body of the working tool forms the connection of the working element to another component, for example another component of the beater. Due to the high force produced by such a beater,
Particularly high strength requirements are imposed on the basic body. In order to securely attach the basic body to the beater, for example, tightly tightened screws are required. These requirements call for materials that are particularly stiff and viscous.

A method for producing a machined component has already been disclosed in German Patent Application DE 197 45 954 A1.
No. 807 is known, in which case the work pieces are assembled from separately produced pieces. It is proposed in this publication to bond the processing element to the basic body by vulcanization. This type of fixation may not be optimal.

The mechanical processing method mentioned at the beginning leads to the heating of the workpiece. Such heating is due to the high energy density of the process and is particularly strong when beating, for example at relatively high material densities. If the composite material, such as ceramics and chrome steel, have different thermal expansion properties, damage to the workpiece may occur. Particularly well suited ceramic species have very low thermal expansion properties compared to chrome steel. This results in the possibility of debonding of the joints, which leads to inconvenient workpiece damage. Furthermore, these types of ceramics are extremely brittle and can crack due to thermal expansion at hard flat joints or at rigid fastening points.

It is therefore an object of the present invention to provide a method of manufacturing a work piece such that a brittle material, which is particularly suitable for the work element, can be used and the work piece is heat resistant. .

This problem is solved by a method having the features of the characterizing part of claim 1.

In such a manufacturing method, as is known, a material other than the material of the basic body is used for the processing element. This has the advantage that the material choices for the processing element can be matched to the desired processing technique, whereas a material with high strength and high viscosity can be used for the basic body. To be The plastic material has high strength and high viscosity due to the accumulated carbon fibers. Such properties can be used in a particularly advantageous manner in order to solve the problems of the invention if the thermal expansion properties of the plastic material are matched to the thermal expansion properties of the material which are favorable for the processing element. The modification, and thus the regulation, of the thermal expansion properties of carbon fiber reinforced plastics can be done in a simple manner. The thermal expansion coefficient can be taken into consideration, and it can also be done in various ways based on different wishes. There are also glass fiber reinforced plastics whose properties can be adjusted according to the requirements mentioned here.

Workpieces made in accordance with the present invention have constant surface properties over time, are wear resistant, mechanically tough, heat resistant, and lightweight.

It is further mentioned that there are ceramic materials with thermal expansion properties that can be matched to the thermal expansion properties of steel, for example chromium steel, which is suitable for the basic body. However, such materials do not meet the technical and cost requirements of the processing elements very well.

[0014]   Next, an embodiment of the present invention will be illustrated and described in detail.

FIG. 1 shows a basic body 1 to which a machining element 2 is connected. The strip 5 of the working element 2 projects only by the projection c and is provided with a number of end faces 11 by means of which a beating work member is formed, which is also called a cutter working member. The contact surface 3 of the machining element 2 and the contact surface 4 of the basic body 1 are connected to each other by a power transmission joint (kraf).
tschluessige Verbindung) is formed, for example, by gluing. The relatively thin adhesive layer so formed is extremely stiff and sufficiently hard, that is to say that the adhesive layer alone is not elastic enough to compensate for thermal expansion.

In FIG. 2, a processed member similar to that of FIG. 1 is shown in a side view. A basic body 1 and a working element 2 with strips 5 of different lengths fixed on it are shown. The shorter strip 5 is shown in cross section. The basic body 1 is attached to the rotor 8 of the beater by means of a detachable coupling element 10, the rotor 8 comprising a shaft 9
Driven by. Of course, a processed member manufactured by such a method may be attached to the stator.

A typical beating element is shown in FIG. A segment-shaped machining element 2 is provided on a circular basic body 1. The working element 2 comprises a strip 5 having a width b, the strip 5 extending straight and having in part different lengths. Curved strips or strips that are more inclined relative to the radius are also conceivable. Even if it is desired to use a machining element 2'having an end face 11 'with an abrasive, porous surface, as shown in FIG. 4, rather than a machining element with strips, the present invention is preferred. The method of can be used.

In the embodiment of FIG. 5, the basic body 1 ′ is provided with a notch 6 in which a complementary ridge of the working element 2 is formed so that a stopper is formed on one side (left side). The part 7 is fitted. As a result, the machining element can be accurately positioned before joining, and the strength of the joining portion can be increased. The other ridge 7'can be filled with a notch 6 ', for example cast into the plastic of the basic body (right side).

Alternative embodiments for forming a rigid connection between the working element and the basic body are also conceivable. As an alternative or in addition to the planar or force-fitting connection, a number of fastening elements distributed along the contact surface make it possible to connect both parts to one another in a form connection. With a sufficient number of fastening elements, the force can be evenly transmitted to the brittle working element. Due to the fabrication of the machined parts of the invention, the objects to be joined can also be joined together during the hardening of the plastic.

[Brief description of drawings]

[Figure 1]   It is a perspective view which shows the processed member manufactured by this invention.

[Fig. 2]   It is a side view which shows the processed member manufactured by this invention.

[Figure 3]   It is the figure which looked at the typical beating process member from the top.

[Figure 4]   It is a perspective view which shows another Example of the processed member manufactured by this invention.

[Figure 5]   It is a perspective view which shows another Example of the processed member manufactured by this invention.

[Explanation of symbols]

1,1 'basic body, 2,2' machining element, 3 contact surface, 4 contact surface, 5 strips, 6,6 'notch, 7,7' ridge, 8 rotor, 9
Shaft, 10 coupling element, 11, 11 'end face, b width, c protrusion

[Procedure for Amendment] Submission for translation of Article 34 Amendment of Patent Cooperation Treaty

[Submission date] June 22, 2001 (2001.6.22)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Contents of correction]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Contents of correction]

The mechanical processing method mentioned at the beginning leads to the heating of the workpiece. Such heating is due to the high energy density of the process and is particularly strong when beating, for example at relatively high material densities. If the composite material, such as ceramics and chrome steel, have different thermal expansion properties, damage to the workpiece may occur. Particularly well suited ceramic species have very low thermal expansion properties compared to chrome steel. This results in the possibility of debonding of the joints, which leads to inconvenient workpiece damage. Furthermore, these types of ceramics are extremely brittle and can crack due to thermal expansion at hard flat joints or at rigid fastening points. From U.S. Pat. No. 4,620,675, rotor disks and stator disks for use in refiners which serve to beat paper fibers are known. These discs are provided with working elements, which are directly connected to the disks which serve as rotors or stators, for example glued to the disks. Such a working element is made of an elastic material so that axial movement of the working element is possible without having to move the disc itself. This applies the same beating force in every beating gap. Here there is a special structure for the refiner which does not require a removable work piece. Various materials are mentioned for obtaining the elasticity of the disk, in particular a composite material of glass fiber and epoxy resin. From U.S. Pat. No. 5,836,525 there is known a work piece which is likewise suitable for use in a fiber material refiner. Here, the basic body is provided with a wear-resistant coating. Multiple options are provided for the base material. This can be a mixture of metal or plastic such as polyamide or epoxy resin and glass fiber. For the coating of such basic bodies, there are also some choices of possible materials, in particular various ceramic species. Probably the workpieces so produced are relatively heat sensitive, i.e. they have a limited strength as the temperature varies. It takes more work to make.

─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Laurent Zeigle             Federal Republic of Germany Horgenzer Kor             Strasse 16 (72) Inventor Joseph Schnite             Federal Republic of Germany Vogtluttes             Halde 6 (72) Inventor Harald Zelder             Federal Republic of Germany Schlier Goethesi             Utrase 16 (72) Inventor Paul-Wilhelm Seepke             Federal Republic of Germany Berg Verdisi             Utrase 40 F-term (reference) 4L055 CB14 CB20

Claims (18)

[Claims] 1. At least one basic body (1,1 ') for carrying out mechanical treatment, in particular for beating suspended fiber material, and wetted by the fiber material suspension during operation. , A method for producing a machined member formed from at least one machining element (2,2 ') consisting essentially of a ceramic material, comprising a machining element (2,2') and a basic body (1,1 '). ) Are manufactured separately from each other and then the working element and the basic body are rigidly connected to each other at the contact surfaces (3, 4). Of a material having a thermal expansion characteristic adapted to the thermal expansion characteristic of a), a method for manufacturing a processed member for mechanically treating a suspension of a fibrous material, the method comprising: 2. The method as claimed in claim 1, wherein the basic body (1,1 ′) is made of glass fiber reinforced plastic material. 3. The method as claimed in claim 1, wherein the basic body (1,1 ′) is made of carbon fiber reinforced plastic material. 4. The coefficient of thermal expansion of the contact surface (3) of the basic body (1,1 ′) and the coefficient of thermal expansion of the contact surface (4) of the processing element (2,2 ′) are up to ± 25%. Method according to any one of claims 1 to 3, which is the same in range. 5. A basic body (1,1 ') and a machining element (at a contact surface (3,4)).
2. The method according to claim 1, wherein 2,2 ') are bonded to each other by adhesive force. 6. The adhesive force is provided by a sufficiently strong and highly adhesive layer,
The method of claim 5. 7. The method according to claim 6, wherein an adhesive layer having a thickness not exceeding 0.5 mm is used. 8. The basic body (1,1 ') and the associated working element (2,2') are connected to one another by means of a plurality of fixed elements which are spaced apart from one another. Method described in section. 9. The method as claimed in claim 1, wherein the strips (5) are formed towards the fiber material side during the production of the processing elements (2, 2 ′). 10. The method according to claim 8, wherein strips (4) having a width (b) of 1 mm to 30 mm are used. 11. The method according to claim 9, wherein a strip (5) with a protrusion (c) of 1 mm to 20 mm on the groove bottom is used. 12. A machining element having an end face (11) having a substantially smooth surface (
Method according to any one of claims 1 to 11, using 2,2 '). 13. The method as claimed in claim 1, wherein processing elements (2, 2 ′) are provided with an end surface (11 ′) having a substantially porous surface (11). 14. A basic body (1 ') is provided with at least one notch (6), said notch (6) being provided when the machining element (2, 2') and the basic body (1) are combined.
14. The method as claimed in claim 1, wherein the ridges (7) of the processing elements (2, 2 ′) are fitted into the ridges. 15. The basic body (1,1 ′) is formed in an annular shape.
The method according to any one of 4 to 4. 16. Elementary body (1,1 ′) having a substantially circular segment shape.
15. A method according to any one of claims 1 to 14 using. 17. A working member for beating a suspended fiber material, the working member being a basic body (1, 1 ') for attaching to a beating machine, and the basic body (
1, 1) and at least one processing element (2, 2 ') of ceramic, which processing element (2, 2') is used during operation of the processing element. To cooperate with another processing element (2,2 ') which is wetted by the material suspension and then moved relative to said one processing element (2,2') in order to obtain a beating effect The basic body (1,1 ') is made of a fiber-reinforced plastic material and is present on at least 80% of the contact surface with the one processing element (2,2'). A processed member for beating suspended fiber material, characterized in that it is firmly connected by a power connection. 18. A processing member for beating a suspended fiber material, the processing member comprising a basic body (1, 1 ') for attaching to a beating machine, and the basic body (
1, 1) and at least one processing element (2, 2 ') of ceramic, which processing element (2, 2') is used during operation of the processing element. To cooperate with another processing element (2,2 ') which is wetted by the material suspension and then moved relative to said one processing element (2,2') in order to obtain a beating effect In this type, the basic body (1,1 ') is made of a fiber-reinforced plastic material and is firmly connected to the one processing element (2,2') at least at two points. A processed member for beating a suspended fibrous material, characterized in that they are bonded by form bonding.