US1132262A - Method of treating metal structures to prevent subsequent change in form. - Google Patents

Description

J, 0. HEINZE, JR. METHOD OF TREATING METAL STRUGTURBS TO PREVENT SUBSBQUENT CHANGE IN FORM. APPLIOATION FILED APR. 9, 1912.

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JOHN O. HEINZE, 3B, 013 DETROIT, MICHIGAN, ASSIGNOR T0 GENERAL MOTORS COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

METHOD OF TREATING METAL STRUCTURES TO PREVENT SUBSEQUENT CHANGE IN FORM. I

Specification of Letters Eatent.

Patented Mar. 16, 1915.

Application filed April 9, 1912. Serial No. 689,603.

To all whom it may concern:

Be it known that I, J 01m 0. HEINZE, Jr., a citizen of the United Statesof America, residing at Detroit, in the county of Vayne and State of Michigan, have invented certain new and useful Improvements in Methods of Treating Metal Structures to Prevent Subsequent. Change in Form, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to the manufacture of machined parts where it is necessary to the proper operation to maintain an exact form. such for instance as the pistons and cylinders of engines. Such structures are usually formed of cast metal, and as an incident to the cooling molten metal during the casing process. unequal stresses are set up in the metal. These stresses may be partially relieved by the removal of the scale in roughing out the structure, but experience has demonstrated that until the metal is subjected to work analogous to that which it performs in the complete structure, these stresses are not entirely equalized. Asa consequence the pistons may be ground or otherwise fashioned to exactly fit the cylinder, but after the machine has been in operation for a short time the form will change.

My invention is designed to overcome this difliculty by magnetically agitating the molecules of the metal before the casting is fashioned, thereby equalizing the stresses and preventing subsequent change in form.

My method of treatment may be carried out in various ways, but asshown,

In the draw1ngs,F1gure 1 1s a sectional elevation of one form of apparatus: Fig.2

is a horizontal section therethrough; and Fig. 3 1s a diagrammatic view showing the magnetic connections.

A. is a core of laminated magnetic metal which is preferably in the form of a continuous ring.

B is a helix or solenoid which is insertible within the ring A and which is adapted to receive the metal to be treated.

As shown, the structure which is treated is a piston C the length of which corresponds to the distance between the opposite poles D and E of the ringA, whereby a complete magnetic circuit will be formed when the helix or solenoid B is energized.

The process of treatmentis to first insert the casting G into the helix B, then to place said helix and core within the ring A, after which an alternating electric current is passed through the helix or solenoid. This will produce magnetic vibrations within the metal C which will relieve the condition of unequal stress and permit the metal to asthe casting to a treatment after the rough ing out out has been taken, but before the grinding or other finishing operation, and in some instances it may be desirable to subject the metal to a plurality of treatments, first in the rough and then after each machine cut. v

For convenience in manipulation the helix B is provided with a handle F by which it may be inserted or withdrawn and the electric connections to the circuit G including the alternating current generator H, may be com leted through this handle.

What I-claim asmy invention is:

1. The process" of treating metal to equalize molecular stresses therein which consists in subjecting the same at normal temperature tomagnetic fluctuations.

sume a form which will be permanently rel 2. The process of treating metal at normal temperature to equalize molecular stresses therein which consists in including the metal to be treated within a magnetic circuit and producing magnetic fluctuations in said circuit. v

3. The process of treating metal at normal temperature to equalize molecular stresses therein which consists in placing the metal to be treated in a magnetic circuit and electric current through the helix to produce corresponding magnetic fluctuations in the metal treated.

5. The method of treating solid'metal to alter its molecular structure, consisting in temporarily subjecting it to the action of the magnetic field of an alternating current. v

6. The method of treating solid metal to alter its molecular structure, consisting in placing said metal adjacent to a conductor carrying an alternating current, subjecting it to the action of the magnetic field of said current until the desired result is obtained, and 'then removing it therefrom.

7. The method of treating solid metal to alter its molecular structure, consisting in placing it Within a coil, passing an alternating current through said coil, and subjecting the metal to the action of the magnetic field of said alternating current until the desired effect is obtained, and then removing it therefrom.

In testimony whereof I afiix my signature in presence of two Witnesses.-

JOHN O. HEINZE, JR, Witnesses:

JAMES P. BARRY, Dnnnnnr COLLINS.

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