US1956618A

US1956618A - Process for the manufacture of rings and especially of wheel tires

Info

Publication number: US1956618A
Application number: US293118A
Authority: US
Inventors: Kamp Eugen
Original assignee: Vereinigte Stahlwerke AG
Current assignee: Vereinigte Stahlwerke AG
Priority date: 1927-08-26
Filing date: 1928-07-16
Publication date: 1934-05-01
Anticipated expiration: 1951-05-01

Description

Ma 1, 1934. 5. Km 1,956,618

PROCESS FOR THE MANUFACTURE OF RINGS AND ESPECIALLY 0F WHEEL- TIRES Filed July 16, 1928 '2 Sheets-Sheet 1 //7uen for Euye K0 ,0 by 5 Ma 3 1934 E. KAMP 3,956,618

PROCESS FOR THE MANUFACTURE OF RINGS AND ESPECIALLY 0F WHEEL TIRES Filed July 16, 1928 4 2 Sheets-Sheet 2 //7 u en far.

E aye Kamp by A/ror'ne Patented May l, 1934 TENT OFFICE Eugen Kamp, Dortmund, Germany, assignor to the firm Vereinigte Stahlwerke Aktiengescllschaft, Dusseldorf Application July 16, 1928, Serial No. 293,118 in Germany August 26, 1927 4 Claims.

The invention relates to a process for the manufacture of rings and especially of wheel tires.

As is well known, the processes hitherto known generally require after jumping and perforating 5 of the blank or block of raw material, an operation for bringing the flattened blank to true circular shape under a special press or forging hammer, or by a cogging of the ring on a shaping groove, before it can be rolled to correct dimensions on a finishing groove.

According to the invention it is possible to eliminate this expensive, complicated and output diminishing intermediate operation by first of all pressing the blank to a fiat disc, the blank lying,

after the flattening, in a closed matrix. Thereafter a cylindrical plunger is forced into the flattened blank, thus causing the material to be compressed within the matrix. Thereupon the bottom centre piece, which is formed by the penetration of the plunger, is punched out in known manner but without opening the matrix. This operation can be simplified and cheapened by employing a multiple plunger press. There is then no necessity to clamp or screw the halves of the die together when the plunger penetrates into the flattened material. The ring produced, may be perforated or punched in such a manner that it has the correct diameter for the pressure head of the finishing mill and is of an exactly round and truly centered shape, thus protecting the rolls to a considerable degree.

Figures 1 and 2 of the accompanying drawings show an embodiment of the invention employing a press with two opposite plungers while Fig. 3

shows in plan view the wheel rim obtained.

The block of raw material or blank 11 which rests on the lower plunger b, movable in the table 0, is pressed down by the simultaneous downward motion of the upper half of the die,

together with the matrix d and the upper plunger .9; this downward motion continues until the matrix d touches the table 0 thus closing the matrix. During this operation the plunger e can be either flush with the bottom of the die or it may project somewhat as shown in Figure 1. The matrix now being in a closed position, the plunger e is caused to penetrate so far into the material, that a recess is formed, leaving a bottom centre piece f, the matrix being now completely filled with compressed material. This operation can be seen from Figure 2. The plunger 6 is now drawn back and the bottom centre-piece I is punched out by means of the antagonistic plunger b, which is pressed upwards by the pusher 9. After the matrix (1 has been lifted, the piece so produced is conveyed to the finishing mill, where it is rolled to the finished state in the same heat. If no lower plunger is available, then the operation may be carried out in such a manner that the lower plunger b is laid on a sliding piece that is withdrawn when the plunger e is actuated for the punching out of the bottom centre piece I.

By means of the new process, the important advantage is realized both from a technical and an economical point of view, that, presuming tires or rings of the same type are to be produced, the weights and dimensions of the several tires or rings are all absolutely identical, a feature which was up till now unattainable. f.

The essential features of the invention are not" affected if the rings or tires are used straight away as they are turned out by the press.

What I claim and desire to secure by Letters Patent of the United States is:

1. Method for manufacturing rings, particularly wheel rims by means of a die with a matrix, in a single operation, which consists in compressing a block of the raw material between the open halves of the die so as to expand the material laterally and form a fiat wheel disc, the matrix being simultaneously closed, then applying pressure to the central portion of the said wheel disc so that the material is forced into the closed matrix thereby filling out the same, and finally punching out the said central portion from the wheel disc.

2. Method for'manufacturing rings, particularly wheel rims by means of a die with a matrix in a single operation, which consists in compressing a block of the raw material between the open halves of the die so as to expand the material laterally and form a flat wheel disc, the matrix being simultaneously closed,'then applying pressure to the central portion of the said wheel disc, in order to form a depression and a waste center piece so that the material is forced into the closed matrix and against its walls, and finally punching out the said waste center piece.

3. Method for manufacturing rings, particularly wheel rims by means of a die with a matrix, in a single operation, which in a combined sequence of steps consists in compressing a block of the raw material between the open halves of the die so as to expand the material laterally and form a flat wheel disc, the matrix being simultaneously closed, then applying pressure in the same direction as the pressure was applied when closing the matrix in order to form a depression in the central portion of the disc and a waste center 1 piece so that the material is lorced into the closed matrix and against its walls and thereby fills out said matrix, and finally applying pressure to the waste center piece in an opposite direction so as to punch out the said piece from the wheel disc.

4. A method for manufacturing rings by means of a die with a divided matrix, and particularly Wheel rims of precise dimensions from blanks subject to tolerances of weight, which consists in initially compressing a cylindrical blank between the open halves of the die by means of a pres sure acting simultaneously and uniformly with continuous efiect upon the whole cross section of the blank so as to transform said blank into a Learners illatdisc 'untllthe halves of the die meet and form a closed die enclosing a die chamber of constant size, thereafter applying pressure upon the central portion of the blank or flat disc which does not wholly fill the die, until said disc completely fills out said die and thus compensating the tolerance in the original weight of the blank by means 01 a more or less deep penetration into said blank on the part of the die member acting upon the central portion of the blank, and finally punching out said central portion containing the whole of said tolerance of the original weight of the bl.

EUGEN RAW.