DE2940685A1 - METHOD FOR THE CONTINUOUS PRODUCTION OF MOLDED METAL STRIPS FOR THE PRODUCTION OF BEARINGS - Google Patents

Description

2 ^ 0685

description

The invention relates to a method for the continuous manufacture of shaped metal strips for bearings.

The conventional practice of making bearings from metal strips is to proceed from the metal strip using a press to punch out blanks with the desired shape and size and the Bends blanks also using a press to the desired shape. After that, the molded blank machined using one or more than two of the following stages a finishing stage or finishing step of the width, a bevel or Folding stage, a stage of adjusting the thickness, a stage of forming an oil groove, a stage of forming a lubrication hole, a step of forming an oil pan, etc. In the known method described, there are some Disadvantages occurred. Since the metal strip is punched along its width in this process, the Size (the outside diameter) of the product is restricted. Furthermore, the yield rate is low, since it is necessarily large Quantities of waste materials are formed. This method is therefore in terms of material savings and on production costs not favorable.

It has been proposed to slit the metal strip lengthways in order to increase the rate of extraction. However, even if the metal strip is cut into blanks in the longitudinal direction, namely axially, it is necessary leaving sufficient tolerance to trim the blanks when such width trimming is done,

030021/0618

ORIGINAL INSPECTED

after each blank is cylindrically wound into a cave-shaped can, semicircular to a semicircular Thrust washer has been deformed or has been deformed into a bearing with a semi-cylindrical configuration is. This is due to the lack of precision with which the trimming is carried out in width, using a single-purpose machine specially designed for the implementation such trimming has been adapted. Consequently the amount of the waste material increases and the yield rate becomes low as in the known method of production of blanks is the case in which a metal strip is punched in the transverse direction.

Furthermore, in the known method, additional devices, which are used exclusively for transporting semi-finished products, must be used to convert the semi-finished products To pass products through a variety of processing stages to obtain the final products, after which the metal strip is deformed into the shape of a bearing. This increases the production costs. Additional to that, that various operations, for example attaching and detaching the semi-finished products to and from various Processing machines for carrying out special processing stages of the semi-finished products, intermittently, be carried out manually or mechanically, which results in a reduction in production output, what is due to the process going through too many stages. This procedure is therefore time consuming.

The object of the invention is to overcome the disadvantages of the prior art described above.

030021/0618

2 Γ / = ■? 6 8 5

In particular, the invention is intended to provide a process for continuous Manufacture of shaped metal strips for making bearings are provided at where a variety of process operations are selectively and continuously performed to reduce the amount of waste material to greatly reduce, to increase the yield rate and to improve the production speed.

The method should continue to run with a reduced number of process stages and with increased productivity.

The method should continue to dispense with additional special machines in order to reduce production costs.

The method should continue to have a large number of processing stages automatically and continuously to increase the product life.

In the process, shaped metal strips are to be obtained, which are suitable for bearing with desired Make shape.

This object is achieved according to the invention.

In the method according to the invention, a metal strip for radial bearings is in a substantially horizontal plane stored and moved lengthways to be subjected to a series of selective and continuous process operations to become, which the formation of a lubrication hole, an embossing or raised elaboration or stamping, an edge or. Edge straightening, chamfering, the formation of an oil groove and the adjustment of the thickness include. These process steps are carried out during the longitudinal movement of the Stripe exercised on this.

030021/0618

ORIGINAL INSPECTED

The invention is therefore a process for continuous Manufacture of shaped metal strips for bearings, in which the shaped metal strips for manufacture The bearings are made from a composite strip of metal in a single-layer or two-layer construction is trained. The method according to the invention is characterized in that each of the metal strips selectively and continuously subjected to one or more of the following process steps: the formation of at least a lubrication hole, the embossing or raised finishing or stamping, the trimming or finishing of the edge or the edge, beveling or folding, ... the formation of a lubrication groove and a finishing treatment of the thickness. Included the metal strip is moved lengthways while it is in is mounted in a substantially horizontal plane.

The invention has the particular advantage that when an edge or edge straightening is carried out, a A tolerance of about 0.2 mm is sufficient, which is in contrast to a tolerance of about 1.5 mm, which is adhered to must be used when using a prior art method in which the edging is performed after cylindrical or other semi-finished products have been obtained as described above. This means that in the known method the tolerance is seven times greater than in the case of the invention Process showing that the latter greatly reduces the amount of waste material.

The invention is explained in more detail with reference to the accompanying drawings. Show it

030021/0618

2Π40685

Fig. 1 is a plan view of a bimetal strip with a large Width in the method according to one embodiment of the invention is used;

Figure 2 is an enlarged cross-section taken along the line H-II of Figure 1;

FIG. 3 is a plan view of second bimetal strips obtained by slitting in the longitudinal direction of the one shown in FIG 1 shown bimetal strip;

Flg. 4 a schematic rare view of a device, which figure the manufacturing stages of the invention Shows procedure;

Figure 5 is an enlarged cross-section taken along line V-V of Figure 4;

FIG. 6 shows an enlarged cross section, taken along the line VI-VI of FIG. 4; and

FIG. 7 shows an enlarged cross section, taken along the line VII-VII in FIG. 4.

Based on the drawings, a preferred embodiment is now to be of the invention will be described. A bimetallic strip 1 with a large width according to FIG. 1 consists of two Layers, namely one Uhterlagestahlschlcht 2 and one Bearing alloy layer 3. The bimetal strelfen 1 becomes In Longitudinal direction (in the direction of arrow L in Figure 1) by means of a roll cutting machine or a longitudinal cutter to a plurality of second bimetallic strelfen 4 with the desired Cut length as shown in Figure 3.

030021/0618

The second bimetal strips 4 are each around a drain drum 5 and a take-up drum 6 wound up, as shown in FIG.

In FIG. 4, the reference numeral 7 designates a straightening machine in order to straighten the second bimetal strip 4. The reference numeral 8 denotes a device to a rough rounding or beveled edge on each of the Cut corners 9 of the backing steel layer 2. The reference numeral 10 denotes a device for making an edge or To straighten the edge and to effect a bevel or bevel. This device contains an edge or edge preparation dome 11, a mandrel 12 to create a bevel or To obtain a bevel on each of the corners 9 of the backing steel layer 2, and a mandrel 14 to make a bevel or bevel. Fold on each of the corners 13 of the bearing alloy layer 3 to get. Numeral 15 denotes an apparatus for machining the surface of the bearing alloy layer 3 to have an oil groove having a desired depth thereon. The reference number 16 denotes a milling machine to effect rough machining of the surface of the bearing alloy layer 3, to give it a substantially uniform thickness. The reference numeral 17 denotes a mandrel to the Cut the surface of the bearing alloy layer 3 to the desired thickness. The mandrel 17 can be fixed by a Cutting device to be replaced.

Although it is not shown, between the straightening machine 7 and the device 8, a rough bevel on each of the corners of the backing steel layer 2 to cut one or more devices for formation a lubrication hole, an oil pan and a lubrication groove

030021/0618

be provided, what in the individual case of the material, the type and the use of the bearings. Such devices can e.g. a device for punching the metal strip, to form a lubrication hole, an embossing device for forming a ball indentation type oil pan is formed with a multitude of circular recesses, and an embossing device for the formation of oil grooves be with a variety of shapes. The use of embossing devices to form an oil pan and a Lubricating groove has the advantage that the oil pan and the lubricating groove are formed in any desired shape can.

So that the bimetal strip 4 moves at the same speed can move as a whole, when the method according to the invention is carried out in practice, can move a part or parts of the bimetal strip 4 before and after each of the above devices be loosened or detached, although such loosened or detached parts are not shown in the drawings.

Any of the cutting devices can be used in forming a lubrication groove 15 can be used selectively for the oil groove and the embossing device, provided that the through the aforementioned two devices formed grooves have the same shape. The oil groove according to the invention formed by the cutter 15 for the oil groove is a straight groove that is parallel to the length of the bimetallic tire 4 is arranged. Therefore, if necessary is to form an oil groove having a shape other than that of a straight groove, then may in addition, the above-mentioned embossing device can be provided. However, if desired, a lubrication groove one

030021/0618

desired shape using the cutting device 15 for the oil groove, then it becomes necessary to to use a special device or to attach it to the cutting device 15 for the lubrication groove, to give it the necessary function.

In the following, the implementation of the method is intended with respect to of the various stages are described. From Figure 4 it can be seen that the bimetal strip 4, the is unwound from the feed drum 5 in the direction of arrow M, is aligned by the straightening machine 7 and passed through the device 8 to make a coarse bevel on each of the corners of the backing steel layer 2 to cut where the corners 9 of the steel backing layer 2 have a rough bevel or bevel be subjected to coarse bevels or bevels, as shown at 18 in FIG will.

The bimetal strip 4 is cut along its sides by the edging mandrel 11 of the device 10 in order to effect edging and cutting of chamfers to the side surfaces 19, the have a desired width to be finished by cutting sides. Then a completion chamfer is made the fine bevel mandrel 12 on the coarsely beveled Part 18 of the backing steel layer 2 is applied to complete the beveled side 20, as shown in FIG is shown. The corners 13 of the bearing alloy layer 3 are cut by the fine bevel mandrel 14, to obtain finished chamfer parts 21 as shown in FIG. The bimetal strip 4, which is from the device 10 is released, is with a lubricating

030021/0618

groove 22 formed by the lubricating groove cutting device 1.5, as shown in FIG. 7, and on a receiving drum 6 wound after a desired thickness has been given to the bearing alloy layer 3 by the surface the bearing alloy layer 3 has been milled with a milling machine 16 and after the treatment with the edging processing mandrel 17 has been made.

The bimetal strip 4, which has been subjected to the aforementioned machining, becomes blanks with cut to the desired length. The blanks are then by a known press forming process, a three roll forming process, a lot of deformation process etc. further processed to produce bearings with the desired shape, e.g. cave-shaped Bushings, semicircular sealing washers, bearings with a semicylindrical shape, etc. to form. if the hollow-shaped bushings and the bearings with semi-cylindrical Shape, the bearing alloy layer 3 is usually on the inside of the products arranged.

In a preferred embodiment of the invention, as described above, bimetallic trelves are made a backing steel layer and a bearing alloy layer are used. However, the invention is not based on this special shape restricted by stripes. Rather, any fixed bearing strips or multilayer bearing strips, which have been produced by known casting or sintering methods can be used. In the here In the embodiment described, mechanical cutting devices, e.g. mandrels, etc., are used to cut edges or edges to be trimmed to the desired width and to cut bevels or bevels. Instead of that

030021/0618

but roll forming devices can also be used to deform the bimetal strips. In the finishing machining of the thickness of the bearing alloy layer, roll deformers may be used in place of the milling machine of the mandrel and the fixed cutter to effect reduction of the thickness by rolling. A width adjustment process, a chamfering process, a thickness adjustment process, a lubricating hole forming process, an oil pan forming process, and a lubricating groove forming process can be selectively Depending on the kind of material, the type and intended use of the bearings. In the embodiment described herein, a straightening machine is used to determine the degree of dimensional accuracy; with which the bimetal strip is processed (to improve the quality of the products). However, the straightening machine 7 can be omitted if the bimetal strip k has very few bends. In other words, the straightening machine 7 can be selectively applied according to the purpose of the products.

It will be seen that the inventive method for producing bearings with a desired shape from planar Netallstrip is suitable. In the method according to the invention, the metal strip is continuously deformed and / or longitudinally machined to selectively perform one or more than two of the procedural operations, such as formation of a lubrication hole, embossing, adjustment of the width, bevel or fold, formation of the lubrication groove and adjusting the thickness according to the shape and construction the desired products. It will

030021/0618

apparent that the inventive method the advantages entails that the number of process stages is reduced, that the yield rate and the rate of production and that formed metal strips for the manufacture of bearings are produced in an economical manner can be, which is in contrast to a known method in which blanks with the desired shape initially are punched out of metal strips and then the blanks are formed and / or machined.

030021/0618

Claims (11)

KRAUS & WEISERT _n ,., _ _Oc 7: -3 't' J h 8 5 PATENT LAWYERS * ~ ~ DR. WALTER KRAUS DIPLOMA CHEMIST DR-ING. ANNEKATE WEISERT DIPL-ING. SPECIALIZATION CHEMISTRY IRMGARDSTRASSE 15 · D-8OOO MUNICH 71 · TELEPHONE 089 / 797077-797078 ■ TELEX O5-212156 kpatd TELEGRAM CRAUS PATENT 2320 WK / rm DAIDO METAL COMPANY LTD. Nagoya / Japan Process for the continuous production of shaped metal strips for the manufacture of bearings Claims M. / Process for the continuous production of <^ y formed metal strips for the manufacture of bearings from metal strips with single-layer or composite multi-layer construction, characterized in that that one carries out selectively and continuously more than one of the process steps which result in the formation of a lubrication hole, an embossing, a setting of the width, a bevel or bevel, the formation of a lubricating groove and adjusting the thickness of the individual metal strips 030021/0 6 18 include to make bearings while the metal strip is moved in the longitudinal direction. 2. Process for the continuous manufacture of shaped metal strips for the manufacture of bearings from metal trelves with single-layer or composite multi-layer construction, characterized in that that one stores or supports the individual metal strips in a substantially horizontal plane, selectively and continuously at least one of the process steps: education a lubrication hole, embossing, edge or edge dressing, Beveling or folding, forming a lubrication groove and machine thickness processing of the metal strip, to produce bearings, while the metal strip, which is stored in a substantially horizontal plane is moved in the longitudinal direction. 3. The method according to claim 1 or 2, characterized in that the process of formation makes the lubrication hole by punching. 4. The method according to claim 1 or 2, characterized in that the embossing process performs to form an oil pan and / or a lubrication groove. 5. The method according to claim 1 or 2, characterized in that the process of the edges or. Edge dressing, the process of beveling or folding and the machining process of the thickness is carried out using a cutter or roll deforming device. 030021/0618 ORIGINAL INSPECTED 2 ⁰ ^ 0685 6. The method according to claim 1 or 2, characterized in that the process of formation the lubrication groove using a cutter. 7. The method according to claim 4, characterized in that that the oil pan and / or the lubrication groove have the desired shape. 8. The method according to claim 6, characterized in that the process of forming the oil pan to form a straight groove that extends parallel to the length of the metal strips. 9. The method according to claim 1, characterized in that the metal strip is removed from a Removes the guide drum, aligns the metal strip using a straightener and that the metal strip winds up on a take-up drum after performing the operations. 10. The method according to claim 1 or 2, characterized in that the metal strip in Cut lengthways to give it the desired width before performing these operations. 11. The method according to claim 1 or 2, characterized in that the bearings are cave-shaped Manufactures bushings or bearings with a half-cylinder shape. 030021/0618