US2297385A - Method of producing compound cast bearings - Google Patents

Description

29, 1942. F. BIEDERMANN 2,297,385

METHOD OF PRODUCING COMPOUND GAST BEARINGS Filed Feb'. '5, 1940 I n' Maf I Patented Sept. 299, y1942 METHOD 0F APltODUCYINGr COMPOUND CAST BEARINGS Felix Biedermann, Berlin-Weissensee, Germany;

vested in the Alien Property Custodian Application-February 3, 1940, Serial No. 317,207

Germany February 3, 1939 3 Claims. (Cl. 29-149.5)

nearly continuous production of compound cast bearings is obtained which savestime and individual work and therefore renders cheap the manufacture of such bearings. The forming by the bending operation replaces the otherwise required expensive finish of the steel blank to be lined which is characterized by a large consumption of material and a large removal of metal by cutting. Such methods, however, are rather complicated and in particular are not adapted tobe used, i1' bearing metal alloys, for instance lead bronzes, are to be treated which from the standpoint of casting technique offer great difcultles, because the steel and the alloy may be welded together under certain condition only. whereas harmful segregations cannot be prevented. Moreover, in this manner at the best half bearing boxes only may be produced.

Methods for the manufacture of bearings by internally lining cylindrical tubes are known according to which a tube provided Vat the upper air is lowered into the melt, whereupon the melt, i. e. first of all borax and then bronze, are drawn in by vacuum. The excess metal is then pressed out again, whereby eventually a core may be introduced. The compound-cast bodies produced in this manner are then eventually by dividing further treated to obtain a plurality of bearing boxes. For a production on a large scale this method', however, is not very well adapted, be-

end with supply means for suction or compressed formed as a vessel of one piece. In thisn manner the known lining of compound cast bearings in an uprightl mold may be carried out without using a'special mold or any other additional device Which affects the cooling. In particular casting is effected without the use of a sand grain or the like as lower closure. The blank in this manner may very simply be treated in a manner known per se with a fiuxing agent.

Other objects and advantages tion will be apparent during the course of the following description. In the acompanying drawing, forming a part of this specification, and in which likeL numerals are employed to designate like parts throughout the same,

Figure 1 is a sectional View of several steel blanks arranged to receive molten bearing metal in accordance with the invention,

Figure 2 is a sectional viewlof a blank having a mandrel inserted therein to force out the excess bearing metal,

Figure 3 is a sectional view of the steel blank lined with thebearing metal at the completion of the operation shown in Figure 2,

Figure 4 is asectional view of the bearing with y and the steel blank obtained in this manner is chilled `inwater as quickly as possible. The

cause it is rather complicated and requires al produced which are free'of the above mentioned.

drawbacks.

To obtain the object aimed at according to the invention, a special blank is used which is of exactly or nearly exactly the desired shape, for instance cylindrical, Aof the supporting portion.

the wall of the bearing portion desired later on,' I allowing the most simple manufacture of the --'iihe blank, moreover, is from the beginning 55 body onalarg'e scale.

superuous bearing metal, however, may also be removed in a suitable manner after cooling.

Then for the production of a bearing ring as seen in Figure 4 the bottom 5 is `severed. For the production of half bearing boxes the blank is once more subdivided as seen in Figure 5, so

that by a corresponding forming two halves A and B of the desired radius are directly obtained.

-A blank according to the invention for the supporting box may be produced in the usual manner. According to one modiiication of the invention chiplessly deformed, particularly drawn bodies. are used. 'The operation vmay be startedby using a sheet metal of nearly the thickness of of the inven- An essential advantage of the present invention consists in avoiding any substantal defor-` mation of the cast blank in spite of the production on a large scale. The defonnation of compound cast plates to bearing portions must, as is quite evident, have a harmful effect upon the quality of the finished bearing portion, as hereby the structure as well as the connection of the linecl bearing material is affected.

It is to be understood that the form of the invention, herewith shown and described, is to be taken as a preferred example of the same. and that various changes in the shape, size and arrangement of parts may be resorted to withthe scope of the subjoined claims.

What I claim is:

1. In a method of the character described, v

the lining is bonded to the blank and cool, severing the bottom of the blank and the portion of the bearing blank which lines the bottom of the blank and thus producing a bearing ring.

blank with the exception of a portion thereof forming a lining for the blank, then after the fusible metal is bonded to the blank and cool, removing the bottom of the blank and the portion of the bearing metal which lies said bottom and thus producing a bearing ring.

3. -In a method of the character described, placing a cup-shaped steel blank in an upright position, illiing said blank with fusible bearing metal in molten condition, subsequently heating the blank and the bearing metal contained therein, electing all of the bearing metal from the blank with the exception of a portion thereof forming a lining for the blank, then after bottom and thus producing a bearing ring, and

ilnally cutting the bearing ring lengthwise thereof and thereby forming half bearing boxes.

FELIX BIEDERMANN.

Images