US 1395357 A
Description (OCR text may contain errors)
A. L. PUTNAM.
METHOD 0F MANUFACTURING DISK WHEELS.
APPucATmN FILED oc.'27,1919.
1,395,357. Patented Nov. 1, 1921.
2 SHEETS-SHEET l.
A. L. PUTNAM. j 4METHOD 0F MANUFACTURING DISK WHEELS.
APPllCATION FILED OCT. 27, 1919.
1,395,857. Patented Nov. 1, 1921.
2 SHEETS-SHEET 2.
UNITED STATES PATENTl OFFICE.
ALDEN L. FII'INAIVI,` OF DETROIT, MICHIGAN, ASSIGNORVBY MESNE ASSIGNMENTS. TO
DETROIT PRESSED STEEL COMPANY, OF WILMINGTON, DELAWARE, A CORPORA- TION OF DELAWARE.
METHOD OF MANUFACTURING DISK WHEELS.
Specification o Letters Patent.
Patented Nov. 1, 1921.
Application filed October 27, 1919. Serial No. 333,859.
To all whom t may concern.'
Be it known that I, ALDEN L.. PUTNAM, a citizen. of the United States of America, residing Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Methods of Manufacturing Disk Wheels, of which the following is a specification, reference being had therein tothe accompanying drawings. Y
The invention relates `to themanufacture of disk wheels and more particularly to the forming of disks of tapering cross-section from the center` towardv the periphery. It is the object of the invention to form the disk from a `forged blank which may, if desired, be integral with thehub. It is a further object to obtain a blank which has a concentrated section to retain the heat, but of such form as to facilitate radial expansion in av subsequent rolling or drawing operation. vThe invention therefore comprises the process or method as hereinafter set forth.
In the drawings:
Figure 1 is a cross-section through the forged blank, showing it in engagement with rolls for radially expanding the same;
Fig. 2 is a side elevation of Fig. l;
Fig. 3 is a cross-section of a modified blank, showing in dotted lines the expanded disk;
Fig. 4.- is a side elevation thereof;
Fig. 5 is a view similar to Fig. 3 showing another modification. v
In the manufacture of diskl wheels it is usual to form the same from sheet metal. It is, however, advantageous to form the disk of a cross-section tapering from the center toward the periphery so as to increase the strength relative to the weight of metal and to better distribute the stresses. The forming of this tapering section requires either the machining of a thick blank and the consequent waste of metal or rolling, or otherwise expanding the metal to reduce the thickness and increase the diameter. The latter method is rendered diiiicult by reason of the thinness of metal, which quickly loses its heat when in contact with the rolls or dies.
With the present method, instead of starting with the sheet metal blank, I? use a forged blank of smaller diameter than the finished disk and having an annular peripheral concentrated section of sufficient mass to produce the complete disk. This blank is then rolled, or otherwise expanded, resulting in a disk of predetermined diameter and cross-section- As shown in Figs. 1 and 2, A is a blank, preferably a drop-forging having a formed hub portion B, a radially outwardly extending web portion C and an annular peripheral portion D of greater thickness than the re.- quired mass to complete the disk. The blank thus formed is preferably expanded by `conical rolls E and E, which are so arranged as to engage with the annular portion D progressively thinning the same and forcing the metal outward in a tangential direction. The web portion C being thinner than the portion D will permit the inward movement pf the rolls, so that at the completion of the operation there is formed a disk of tapering section, as indicated in dotted lines at F.
With the construction shown in Figs. 3 and 4, the blank A is formed without a hub portion, being preferably drop-forged to form the inner web portion C terminating in a foot flange Gr for engagement with a bearing on the hub, while at the outer end of the web is the concentrated section D similar to the construction shown in Figs. 1 and 2. The blank is also preferably formedwith a series of bosses I-I, which are distributed around the center of the blank and are adapted to form apertured bearings for engaging with the clamping bolts or studs. The blank is expanded either as described in Figs. l and 2 or by any other suitable means of gradually thinning the annular portion D and forcing the metal outward.
With the construction shown in Fig. 5, the'blank A2 is formed with a hub portion B of a different shape from that shown in Fig. 1, the construction being otherwise the same as in that figure.
In all of the constructions above described, the blank is forged with a thickened annular' peripheral portion and with a portion within this annular portion which is reduced in thickness to substantially the final dimension. This greatly facilitates the radial expansion of the blank as the concentrated section will hold the heat and will maintain the metal in a plastic condition.
What I claim as my invention is:
lj The method vof forming metal disks, comprising the forging of a blank of smaller diameter than the completed disk and with a thickened peripheral portion sufficient in mass to complete the disk. and in expanding said blank by progressively rolling said peripheral portion and progressively forcing the same outward.
2. The method of forming metal disks, comprising the forging of a blank of smaller diameter than the completed disk having a thickened peripheral portion suiiicient in mass to complete the disk, and also an inwardly-extending web portion of substantially its final thickness, and in radially expanding the'blank by rolling outward the thickened peripheral portion thereof.
8. The method of forming metal disks of tapering cross-section, comprising the forging of a blank of less diameter than the completed disk and having a thickened pe- .ripheral portion of suflicient mass to complete the disk, and an inwardly extending web portion of substantially7 its final thickness, and in expanding the blank by rolling the thickened peripheral `section outward and progressively thinning the same from the thickness ofthe web.
4. The method of forming metal disks,
comprising the forging of a blank of less diameter than the completed disk and with a thickened peripheral portion sufiicient in mass to complete the disk and also haring an innf'ardly extending rweb portion of substantially its final thickness, and then rolling the thickened peripheral portion to progressively force the metal tangcntially` outward. thereby expanding the diameter and diminishingthe thickness.
The method of forming wheels haring an integral hub and disk body, comprising the forging of a blank with the hub portion, a web portion extending outward therefrom of substantially its final thickness, and a peripheral portion of smaller diameter than the completed disk and suiiicient in mass to complete the disk, and in then rolling the peripheral portion to progressively force the same outward while reducing the thick ness.
6. The method of forming metal disks comprising the forging of a blank of less diameter than the complet-@d disk and with a peripheral portion suiiicicnt in mass to complete the disk, also having an inwardly extending web portion of substantially its iinal thickness, and in expanding said blank by progressively thinning and forcing said peripheral portion tangentially outward.
In testimony whereof I aiiix my signature.
ALDEN L. PUTNAM.