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Publication numberUS2502737 A
Publication typeGrant
Publication dateApr 4, 1950
Filing dateJun 19, 1945
Priority dateNov 2, 1944
Publication numberUS 2502737 A, US 2502737A, US-A-2502737, US2502737 A, US2502737A
InventorsAndre Lemoine, Francois Meley
Original AssigneeCie Forges Et Acieries Marine
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for forging connecting rods
US 2502737 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

April 4, 1950 F. MELEY ET AL. 2,502,737

METHOD FOR FORGINGCONNECTING RODS Filed June 19, 1 45 I 5 Sheets-Sheet 1 177 for/769- Aprifl 4, 1950 F. 'MELEY ET AL 2,592,737

METHOD FOR FORGING CONNECTING RODS Filed June 19, 1945 I Z5 Sheets-Sheet 3 14%. or e a" Patented Apr. 4, 1950 UNITED STATES PATENT OFFICE METHOD FOR FORGING CONNECTING RODS Application June 19, 1945, Serial No. 600,377 In France November 2, 1944 1 Claim.

Our invention has for its object a method for manufacturing forged connecting bars having an integral fibre formation.

In accordance with said method we start from a blank having itself a proper fibrous constitution as obtained in accordance with the teachings of the copending U. S. patent application Ser. No. 600,375, filed June 19, 1945, for Method of forging blanks.

Operating according to said teachings, we obtain starting from a section of ingot or bar, two blanks wherein the less sound parts corresponding to the axial zone of the ingot 01' bar have been eliminated.

The method according to the present invention consists in plastically deforming the metal of these blanks in a manner such as will provide a direction and an arrangement of the fibres ensuring a maximum resistance against stresses of opposite and alternating directions. In particular this deformation provides for the fibres remaining perpendicular to the transversal effort in the parts which resist to shearing stresses.

Appended drawing shows by way of example and by no means in a limitative manner the application of our method to the manufacture of a master connecting rod for a seven-cylinder star motor.

Figs. 1 to 12 recall to mind the difierent known steps in the production of a first blank having enclosing fibres without the impure portions of the original ingot section.

Figs. 1, 2, 4, 5, 7, 9 and 11 are side views and Figs. 3, 6, 8, and 12 plan views, corresponding respectively to Figs. 2, 5, 7, 9 and 11.

Fig. 13 shows the blank in plan view after stamping.

Fig. 14 is a cross-section along line XIV-XIV of Fig. 13 of the same blank.

Figs. 15 and 16 show the manner of performing a first and then a second punching.

Fig. 17 is a plan View of the blank after said punching.

Figs. 18 and 19 illustrate the manner of operating for a third and a fourth punching operation.

Fig. 20 is a view of the blank when finished.

Fig. 21 is a cross-section along line XXIXXI of Fig. 2 showing the same blank.

The original ingot section (Fig. 1), more or less forged or rolled, comprises impure parts in its axial portions as bonded by the interrupted lines bcbc'. Its outer portions a. are on the contrary formed of sound metal. Starting from said ingot section, a first blank is prepared in accordance with the method disclosed in our said copending application. To this end it is given, through swaging, the shape of a shuttle as shown in Figs. 2 and 3. It is then flattened along its axis so as to be transformed into a thick disc (Fig. 4). A further flattening in a direction perpendicular to the preceding gives the ingot section the elongated shape shown in Figs. 5 and 6. It is swaged in a manner such that its ends become wider than the intermediate zone (Figs. '7 and 8). The central part mn-mn, in which the impurities are collected is finally eliminated and one obtains two first identical blanks provided with enclosing fibres. The principle of this manner of operating has been described in our copending above mentioned application.

A first preparation provides then the first desired blank containing no impurities and having already a suitable fibre arrangement.

The stamped object assumes its final shape (Figs. 13 and 14). It is then punched to form the apertures in the head and foot of the corn necting rod in two stages (Figs. 15, 16 and 17), then the axial holes for the foot of the small connecting rod, also in two stages (Figs. 18 and 19) and the blank reaches thus its final state (Figs. 20 and 21) It is apparent that the fibres are disposed in parallel sheets with a single out-- let at d. These fibres are perpendicular to the maximum transversal stresses transmitted by the small connecting rods in the peripheric parts 6 of the head of the connecting rod in front of the holes serving for the pivotal mounting of the small connecting rods.

What we claim is:

A process for obtaining from an ingot preliminarily subjected to a mechanical treatment to secure a longitudinal fibre structure two connecting rod blanks of sound metal wherein the fibres are parallel to the contour of said blanks comprising attenuating the ends of said ingot by swaging to give it the form of a shuttle, flattening said shuttle along its axis to form a thick disc, flattening said disc along a diameter thereof to form a bar with rounded ends, partially flattening the median portion of said bar and then removing the central unsound part of said flattened median portion of said bar to form said blanks.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 942,489 Dods Dec. 7, 1909 1,581,512 Coates Apr. 20, 1926 1,586,632 McConway June 1, 1926 1,707,778 Witherow Apr. 2, 1929 1,791,187 Brauchler Feb. 3, 1931 2,080,640 Templin May 18, 1937 2,169,894 Griley Aug. 15, 1939

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US942489 *May 6, 1909Dec 7, 1909John H DodsMethod of making wrought articles.
US1581512 *Aug 25, 1920Apr 20, 1926By Mesne AssignmentsMethod oe making abticles from steel ingots
US1586632 *Nov 18, 1922Jun 1, 1926 A corpobation op
US1707778 *Jan 5, 1926Apr 2, 1929Colonial Trust CoMethod of making metal articles
US1791187 *Apr 5, 1929Feb 3, 1931Brauchler Charles AMethod of forging
US2080640 *Jun 22, 1934May 18, 1937Aluminum Co Of AmericaMethod of preparing metal stock
US2169894 *Apr 29, 1937Aug 15, 1939William W CrileyMethod of forming blanks
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3010186 *Jan 14, 1954Nov 28, 1961Thompson Ramo Wooldridge IncPiston manufacture
US3014272 *Nov 23, 1955Dec 26, 1961Lyon IncMethod of preparing metal blanks
US3222143 *Feb 17, 1964Dec 7, 1965Mario MacchiniUniversal joint yokes
US5544413 *Jun 10, 1994Aug 13, 1996Omni Forge, Inc.Method and apparatus for manfacturing a flashless metal connecting rod
US5655296 *Dec 30, 1993Aug 12, 1997Ab VolvoMethod of manufacturing connecting rods
US5918575 *Nov 7, 1996Jul 6, 1999Toyota Jidosha Kabushiki KaishaProcessing method for a connecting rod
US6349688Feb 18, 2000Feb 26, 2002Briggs & Stratton CorporationDirect lever overhead valve system
US8205332 *Dec 8, 2008Jun 26, 2012Mahle International GmbhMethod of forming a connecting rod from two dissimiliar materials by providing material blanks of dissimiliar material, joining the material blanks and subsequently forming the connecting rod
US20100139091 *Dec 8, 2008Jun 10, 2010Lapp Michael TConnecting rod
DE4328375A1 *Aug 24, 1993Mar 9, 1995Mahle J Wizemann Gmbh & Co KgRoller lever
DE4328375C2 *Aug 24, 1993Feb 15, 2001Peter PepplerRollenhebel
U.S. Classification29/888.92, 428/611
International ClassificationB21K1/00, B21K1/76
Cooperative ClassificationB21K1/766
European ClassificationB21K1/76D