EP1077087A1 - Milling roller and method for its manufacturing - Google Patents

Abstract

The grinding roller has a rolling jacket (10) with wear-resistant surface reinforcement. Spaced indentations (11, 12) are formed in the outer surface of the jacket and prefabricated hard bodies (13,14) are inserted therein. Through corresponding rough surfaces hollow cavities are formed between the bottom of the indentations and the underneath of the hard bodies and the cavities are filled with an adhesive (17). The adhesive mass preferably incorporates hard metal splinters. The rolling jacket is made from a cast metal body.

Description

The invention relates to a grinding roller for granular pressure reduction Good, especially for roller presses for material bed shredding, with one Roller jacket with wear-resistant surface armor that alternates Zones of highly wear-resistant material and intermediate zones other wear resistance. The invention also relates to a Process for producing the grinding roller.

In the case of roller mills, granular, brittle ground material is placed in the roller gap, through the two rotatably mounted counter-rotating rollers are separated from each other, drawn in and there a pressure comminution subject. The so-called material bed crushing is also known in the Roll nip of a high-pressure roller mill or roller press in which the individual particles of the frictionally drawn into the nip Grist in a bed, d. H. in one between the two roller surfaces compressed material filling when using a high pressure can be crushed. It goes without saying that the roller surfaces of a high load and a high Are subject to wear.

Such roller surfaces have at least the following requirements : They should have a high wear resistance, can be produced inexpensively by the operator or Customers can be repaired, and also good feed behavior for possess the goods to be shredded.

It is known the roll surfaces of material bed crushing roll mills or to make roller presses more wear-resistant by a large number of prefabricated carbide bodies on the roller surface such as B. studs is arranged in the corresponding grooves or blind holes in the roll shell can be embedded (EP-B-0516952 Figure 2). Stand with this so-called grid armor the stud bolts with such a large height to the outside of the roller surface in front and they are spaced from each other that the operation of the roller mill on the surface of the roller Gaps between the stud bolts with the pressed together fine-grained good material remain filled, which is an autogenous Wear protection for the roller surfaces forms and due has a good pull-in behavior due to its roughness.

While prefabricated welding is used to manufacture the grid armor Stud bolts only with a weldable bolt material such as e.g. B. structural steel or the like would be possible, on the other hand, the attachment Prefabricated studs in appropriate blind holes of the roll shell as a result of machining in terms of production technology relatively complex and in the event of damage by an operator practically impossible to repair.

In addition, from EP-B-0659108 a surface armor of Press rolls known, with zones of highly wear-resistant material and Clearance zones with a material of another, e.g. B. lower wear resistance, the highly wear-resistant zones are characterized by hot isostatic Pressed platelet-shaped hard body formed are like the space material made of sinterable composite material through a hot isostatic pressing process on the roller body are attached. By faster wear of the less wear-resistant Intermediate material should be one in the rolling operation Set roller surface profiling with arranged between the hard bodies Troughs or gaps in the operation of the roller press are filled with compressed fine-grained material, which as autogenous wear protection during the roller revolutions in the troughs or gaps between the hard bodies remains. It understands that this surface armor of press rolls by one Operator cannot be repaired at all.

Furthermore, EP-B-0563564 is a grinding roller for a material bed roller mill known in which the roller shell made of a wear-resistant Chilled cast iron exists. Thereby are on the outer surface of the chilled cast iron jacket Profiled welding beads welded on, which cross can, so that then a diamond-shaped weld bead grid pattern for the purpose of achieving autogenous wear protection. Except that it is problematic to weld chilled iron properly, especially if the hard cast material contains a high proportion of carbon, Contains chromium etc, is the production of this chilled cast iron roll cover subsequent special build-up welding is complex. The service life the build-up welding bead is limited.

The invention is based on the object, in particular for the grinding rollers of high-pressure roller mills or roller presses for pressure reduction granular good one for the autogenous wear protection with application surface armor suitable for raster armor technology to create a high through wear and pressure resistance Has durability and yet relatively simple and overall is inexpensive to manufacture and repair.

This object is achieved according to the invention with the device Features of claim 1 and manufacturing with the measures of claim 9 solved. Advantageous embodiments of the invention are shown in specified in the subclaims.

In the case of the surface armor of grinding rollers or Press rolls are in the outer surface of the roll shell from each other spaced-in depressions molded in, which is particularly easy then is accomplished when the roller shell is made of a cast metal body so that any machining operations such as attachment of grooves, holes, etc. can be omitted. Viewed from above the recesses of the roller shell can be circular, elongated, polygonal, Rectangular, square or also shaped like a circle with tips in the circumferential direction of the roller or also with tips in the axial direction. In these recesses are corresponding prefabricated, highly wear-resistant hard bodies especially made of sintered metal. The reason of the deepening and the bottom of the hard body are z. B. by hammering with a certain Roughing depth has been made so that there is between the bottom the hard body to be fitted and the bottom of the recesses Can form cavities. Before fitting the hard body into their respective Indentations of the roller surface will be on the bottom of the indentations and / or on the underside of the hard body in a simple manner Adhesive applied, which then when fitting the hard body fills cavities formed by the roughness. Then the fitted ones Hard body pressed into their recesses using a tool and initiated an adhesive printing process that resulted in a very firm Connection leads.

The tool for performing the adhesive printing process can be a hydraulic one or mechanical press. It is particularly advantageous the tool is a hot one put over the fitted hard body Shrink ring, which is at a temperature of z. B. 200 ° C has been heated and which after cooling, d. H. after its shrinkage from the pressed hard bodies is removed again, for which purpose as a tool serving shrink ring from at least two parts z. B. two ring halves is composed.

So that the shrink ring, which serves as a tool, performs its function of pressing the hard body well into the recesses of the roll shell can and the shrink ring on the tops of the hard body to be pressed Fits tightly, it can be advantageous that the shrink ring on his Inside in the zones opposite the hard bodies to be pressed, corresponding radially inward elevations has, in the same shape as the hard metal body to be pressed.

According to a further feature of the invention, the adhesive can Production of the adhesive connection between the hard bodies and the Because of the depressions with hard metal splinters such. B. hard metal carbide chips be provided, whereby the strength of the adhesive bond is still increased.

The surface armor according to the invention is highly wear-resistant and but comparatively easy to manufacture. Should be in the operation of the roller press or Gutbett roll mill an adhesive connection of a hard body can solve the roller surface in such a case of damage be repaired by the operator himself. The clearance zones of the roll shell between those fitted in the roll shell recesses Hard bodies can be in operation when the roller machine through the entrance protected auto wear protection against wear become.

The invention and its further features and advantages are based on the exemplary embodiments shown schematically in the figures explained.

Fig. 1:

im Vertikalschnitt quer zur Walzenachse die erfindungsgemäße Oberflächenpanzerung für die Walze einer Hochdruck-Walzenpresse ausschnittsweise,

Fig. 2:

in etwas verkleinertem Maßstab die Draufsicht auf die Oberflächenpanzerung der Figur 1 mit mehreren im Walzenmantel eingepassten benachbarten Hartkörpern,

Fig. 3-5:

in nochmals verkleinertem Maßstab die Draufsicht auf benachbart im Walzenmantel eingepasste Hartkörper mit einer jeweils wieder anderen Konfiguration, und

Fig. 6:

die Stirnansicht eines als Werkzeug dienenden Schrumpfringes.

It shows:

Fig. 1:

in a vertical section transverse to the roll axis, the surface armor according to the invention for the roll of a high-pressure roll press in sections,

Fig. 2:

on a somewhat reduced scale, the top view of the surface armor of FIG. 1 with a plurality of adjacent hard bodies fitted in the roll shell,

Fig. 3-5:

on a further reduced scale, the top view of hard bodies adjacently fitted in the roll shell, each with a different configuration, and

Fig. 6:

the front view of a shrink ring serving as a tool.

According to Figure 1 are in the outer surface of a roll shell 10 from each other spaced depressions 11, 12 molded. In these recesses prefabricated, highly wear-resistant hard bodies 13, 14 are fitted, which also rise above the outer diameter of the base body can. The hard bodies can consist in particular of sintered metal and they can z. B. a cylindrical To have shape. The diameter of the hard body 13, 14 can, for. B. 70 mm amount, and the smallest distance between adjacent hard bodies from each other can at the parting lines 20 z. B. 20 mm. The reason 15 of the wells 11, 12 and the underside 16 of the hard body 13, 14 are with of a certain surface roughness, so that the two surfaces do not lie snugly on each other, but small between the two surfaces Cavities have been formed. Before fitting the hard body 13, 14 in their respective recesses 11, 12 of the roller surface is on the Bottom 15 of the wells and / or on the underside 16 of the hard body an adhesive 17 has been applied. Then after the hard body 13, 14 have been inserted into their wells, will be cold around everyone Hard body around a z. B. heated to about 200 ° C, in Figure 1 in sections and the shrink ring 18 shown in front view in FIG. 6 put on, which shrinks when it cools down and thereby the hard body 13, 14 presses radially inward onto the adhesive 17. After graduation the adhesive printing process, d. H. after cooling down the shrink ring 18 it is removed again from the pressed-in hard bodies 13, 14, which is why the shrink ring consists of at least two parts, according to FIG. 6 composed of the two halves 18a and 18b with clamping connection 19 is.

The hard metal plates 13, 14, which according to the top view in FIG. 2 are cylindrical 3, but can also be rectangular according to FIG. 3, polygonal, square or according to FIG Circumferential direction as well as according to FIG Axial direction, etc.

It is important that - as can be seen in FIG. 2 - the parting lines 20 between neighboring hard bodies 13, 14 are significantly smaller than the hard bodies themselves and are staggered so that on the roller surface there are no circumferential grooves, which then lead to a corresponding one Wear on the roller surface.

In Figure 1 it can still be seen that the shrink ring serving as a tool 18 on its inside in the zones that the hard body to be pressed 13, 14 opposite, corresponding radially inward May have elevations 21, the full on the tops of the hard body 13, 14 abut, ensuring a safe transmission of forces during the shrinkage of the pushed-on shrink ring 18 onto the fitted one Hard body 13, 14 is guaranteed.

If the roller jacket 10 of the grinding roller is a cast metal body, so it can also be made from at least two different liquid casting compounds be produced in a single casting process. In composite casting the at least two casting compounds are distributed so that in the outside area of the roll shell a harder metal casting compound and in the radial inner area concentrated a softer metal casting compound of the roller shell become. The metal casting compounds can be coordinated with one another that there is good material compatibility in the mixing zone area and none Tensions occur. The entire roll shell 10 can be centrifugally cast be made, in the appropriate form first the harder metal casting compound and then the softer and tougher one Cast metal casting. At the same time this composite casting in the outer surface of the roll shell 10 Indentations 11, 12 are formed, thereby machining the Roll jacket is not required. The one located in the outer region of the roll shell 10 Cast material can advantageously have a hardness of more than 55 HRC (Rockwell C hardness test). The cast material can be chrome-alloyed and also special carbides and other hard alloy components contain.

When the highly wear-resistant hard body 13, 14 from the roller surface are arranged in a projecting manner, according to a further feature of the invention in the spaces between the adjacent prefabricated Hard bodies 13, 14 prefabricated on the roll surface highly wear-resistant, in particular powder metallurgy or powder ceramic manufactured plate attached to the inserted Can support hard bodies 13, 14 against lateral displacement. This highly wear-resistant platelets covering the surface of the roll shell 10 between the hard bodies 13, 14 protect against premature washing and can extend the service life of the hard body 13, 14 by adhesive connection, solder connection, by hot isostatic pressing or also by means of a positive connection with the roller jacket 10 be connected. This additional wear protection measure is also for such roll shells applicable) that do not consist of cast metal, but e.g. B. from rolled material.

Claims (11)

Grinding roller for pressure comminution of granular goods, in particular for roller presses for comminuting commodities, with a roller jacket (10) with wear-resistant surface armor, which alternately has zones of highly wear-resistant material and intermediate zones of other wear resistance,
characterized by the following features: a) recesses (11, 12) spaced apart from one another are formed in the outer surface of the roll shell (10), b) prefabricated, highly wear-resistant hard bodies (13, 14) are inserted, c) between the base of the depressions (11, 12) and the underside of the hard body (13, 14) are formed by corresponding roughness depths, which are filled with an adhesive (17). Milling roller according to claim 1,
characterized in that the adhesive (17) for producing the adhesive connection with hard metal splinters such as. B. carbide splinters is provided. Milling roller according to claim 1,
characterized in that the depressions (11, 12) of the roller shell (10) and the hard bodies (13, 14) used are circular, polygonal, rectangular, square or rome-shaped with tips in the circumferential direction of the rollers or with tips in the axial direction. Milling roller according to claim 1,
characterized in that the roller shell (10) consists of a cast metal body. Milling roller according to claim 4,
characterized in that the metal cast body roll shell consists of at least two different casting compounds in such a way that a harder casting compound is concentrated in the outer region of the roll shell and a softer casting compound is concentrated in the radial inner region of the roller shell. Grinding roller according to claim 5,
characterized in that the cast material located in the outer region of the roll shell (10) consists of a chromium-alloyed hard cast. Grinding roller according to one or more of claims 1 to 6,
characterized in that in the spaces between the adjacent prefabricated, highly wear-resistant hard bodies (13, 14), prefabricated, wear-resistant, in particular powder-metallurgically or powder-ceramic, plates are fastened on the surface of the roll shell and can be supported on the hard bodies used against lateral displacement. Grinding roller according to claim 7,
characterized in that the wear-resistant platelets are connected to the roll shell by adhesive connection, solder connection, by hot isostatic pressing or also by form-fit connection. Process for producing a grinding roller for crushing granular material, in particular for roller presses for crushing material beds, with depressions (11, 12) arranged in the surface of the roller, into which prefabricated, highly wear-resistant hard bodies (13, 14) are inserted,
characterized by the following features: a) the base (15) of the depressions (11, 12) and the underside (16) of the hard body (13, 14) are manufactured with a specific roughness depth, b) before fitting the hard bodies (13, 14) into the depressions (12, 13) of the roller surface, an adhesive (17) is applied to the bottom (15) of the depressions and / or to the underside (16) of the hard body, c) after the hard bodies (13, 14) are inserted into their depressions (11, 12), the hard bodies are pressed in by an adhesive printing process, in particular by fitting an at least two-part heated shrink ring (18) as a tool, d) after the shrink ring (18) has cooled, ie after it has shrunk, the shrink ring is removed from the pressed-in hard bodies (13, 14). Method according to claim 9,
characterized in that the shrink ring (18) has corresponding radially inwardly directed elevations (21) on its inside in the zones which lie opposite the hard bodies (13, 14) to be pressed in. Method according to claim 9,
characterized in that when the surface armor is attached to a ring bandage fastened to the roller base body, the bandage is first attached to the roller base body without inserted hard body, in particular by shrinking and / or gluing, after which the hard body (13, 14) into the recesses ( 11, 12) of the bandage are used and the heated shrink ring (18) is placed over the fitted hard body (13, 14) as a tool for performing the adhesive printing process.

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