US1329455A - Method and apparatus for drawing metal - Google Patents

Description

APPLICATION FILED FEB. 10, I9l9.

Patented Feb. 3,1920.

ATTORNEY PATENT cur os.

LOUIS H. BRINKMAN, OEGLEN' RIDGE, NEW JERSEY, ASSIGNOR TO BALL ROLLED TUBE CORPORATION, A CORPORATION OF NEW YORK.

1 ME H D AND APPARATUS FOR DRAWING METAL.

To all whom it may concern;

Be it known that I, LOUIS H. BRINKMAN, a citizen of the United States, residingat Glen Ridge, county of Essex, and State of New Jersey, have invented new and useful Improvements in Methods and Apparatus for Drawing Metal, of which the following isa specification.

This invention relates to the drawing of metal rods or tubes.

Where the metal to'be drawn is heated in a furnace, particularly where the furnace is heated by an oil or gas flame, if the furnace gases flow into contact with the metal too intense heating of the metal may occur or the heating of the metal may be unevenly distributed or both. This is notably the case in connection with the drawing of thin tubes. Also where the furnace gases, especially where the furnace is heated by gas or oil flames, are projectedagainst the metal,

'- it is liable to oxidize and form scale, which is most objectionable in the case of thin tubes. i

It is one object of the invention to shield the metal to be drawn from becoming excessively heated.

It is a further object of the invention to evenly distribute the heating of the metal.

' It is a further object of the invention to prevent the formation of scale.

Other and ancillary objects of the invention will appear hereinafter.

While the invention will probably prove most useful when employed in a furnace, it

may have other applications.

In the accompanying drawing which illustrates the invention The figure is a view partly in side elevation and'partly in section of an apparatus embodying the invention and illustrating means whereby the method may be carried out.

Referring to the drawings, 1 is a suitable furnace, which may be heated by an oil flame, fuel orfuel and airbeing admitted to the interior of the furnace by suitable pipes or nozzles 2 and 3. I

Extending through the furnace is a heat distributing and metal shielding tube 4 of metal having suitable heat capacity. Extending through the" tube 4 is a tube 5 Specification of Letters Patent.

Patented Feb. 3, 1920.

6 Application filed. February 10, 1919. Serial No. 275,939.

to be drawn through the die 6 having a series of balls 7, arranged circumferentially of the tube 5 and constituting the members of thedie which operate upon the'work. The ring 8 circumscribing the balls 7 is rotated by an electric motor 9 and suitable cooling means may be provided for the die parts. It is unnecessary herein, however, to describe in further detail the structure of the die or the arrangement of it in conjunction with the motor as such an apparatus is shown and described in my Patent No. 1,203,306, issued October 31st, 1916, and particularly with reference to Figs. 1 to 8 thereof, this showing including a draw bench for draW- ing the tube through the die which may be used in the apparatus of the present case. Within the tube extends a mandrel comprising the tube 10 extending through the furnace and having secured at its end a high speed steel head 11 lying. under the balls 7 and between which and the balls the tube 18 1 space 16, thus retarding the communication of heat from the head to the member 12. The member12 is of iron or steel of'a less refractory character than that of the head 11 and at the high temperatures 'at which it is possible to work the head 11, the threads in the member 12 whereby the head 11 is secured, would be liable to soften and strip off. Accordingly means is provided for cooling the member 12'and particularlythe nipple 14 so that its threads, will not become sufficiently heated to be distorted, carebeing taken to prevent the cooling fluid from being dashed against the head 11. To this'end the member 12 is provided with a central passage 17 which, it will'be observed, does not extend entirely through the member 12 to the head, but is separated from the head by a partition 18. Directly opposite the mouth of the passage 17 is the end of a pipe 19 which, at its other end is connected; with i a suitable source of cooling water under suitable I ordinarily be of highly refractory material,

from undue heating in the furnace, it is surrounded by a suitable heat insulating covering 21. This may be of asbestos which may be maintained in position by means of an 1nclosing metal sleeve 22. Inasmuch as the operation of the apparatusdrawing temperature. might become function of the sleeve 22 is simply to hold the heat insulation in place, it may soften to a considerable extent without affecting the w and consequently 1s not necessary to be absolutely refractory at the temperature to which it is subjected within the furnace.

It will be seen that the tube 4 extends beyond the furnace and practically fills the gap between the furnace and the d1e so that the heat of the tube to be drawn is preserved in its passage from the furnace to the die so that it i delivered to the latter at the proper- Otherwise the tube unduly cooled, particularly if itisthin.' I

To draw a tube, the mandrel is withdrawn from the rear end of the furnace. A tube to be drawn is entered within the tube 4 which may then, be heated up1 or may have previously been heated. T e tube 4 imparts its heat to the tube 5 and when at the proper temperature the latter is passedthrough the die. It being understood that the mandrel is inserted with its head under the balls as shown in the drawing and the end of the tube secured to the draw head as described in ing. of the tube over the mandrel head he neath the balls effects the desired reduction. After the length of tube has been drawn through the die, the mandrel may be with drawn from the rear of the furnace, a new length of tube inserted, heated and drawn as described, and this operation repeated indefinitely.

It will be seen that the tube 4-shields the metal to be drawn from the gases of the furnace so that the formation of scale is mitigated or prevented. Also the hot gases do not beat against the metal so that danger of excessive heating, especially of thin tubes, is prevented. Further the conductivity of the metal of the tube 4 causes any heat received to tend to distribute itself through the tube so that the heat imparted to the metal to be drawn is more evenlydistributed. Also this I conductivity causes heat to'be conveyedto l from a tube my patent above referred to. ,The drawis "passed, and

which it may be carried out, it is to be unered to thedie under the proper heat condiso that the tube to be drawn derstood that neither the invention of appa ratus or method of the drawings, to the precise details recited.

-WhatIclaimis p 1. The method of drawing metal, which consists in causing it to acquire the desired heat from heated walls between which it-is passed, and passing it through a reducing .pass.

is limited to the apparatus consists in causing it to acquire the desired heat from a'heated tube through which itis passed, and passlng it through a reducing pass. I w

3. The method of drawing metal, which consists in causing it to acquire the desired 2. The method of drawing metal, which nor is the method limited heat from heated walls between which it is passed, the said walls being heated simultaneously with the passage of the metal, and passlngthemetal through a reducing pass.

4. The method of drawing metal, which consists'in imparting to it the desired heat through which the metal is passed, said tube being heated from the exsaid metal and a reducing pass. 5. The method of drawing metal, which consists in imparting heat to said metal from hot gases, while shieldingit from said' gases and passing the metal through a reducing pass. i 6. The method of drawing metal, which consists in heating a heat conductin wall by hot gases, and heating metal to' be,

whereby theheat imparted to said metal is'more uniformly distributed, and passing the heated metal through a reducing ass.

7. In metal drawing apparatus,"t e com- 'bination with walls between-which the metal sired degree by reducing the heated metal.

'terlor simultaneously with the passage of' passing the metal through rawnby' imparting heat from said wall to said metal,

wherein it is heated to the deheat derived from'said walls,- means for heating said walls and a pass for" 8. In metal drawingapparatus, the combination with a tube through which the metal ispassed, and wherein it is heated to the .de: sired degree by heat derived from said tube,

means for heating said tube and a pass for[ reducing the heatedmetal.

9. In metal drawing apparatus, the c0m-' bination withafurnace of a tube in said,

furnace through which the metal is adapted to be passed and a pass for reducing the metal. I c

10. In metal drawing apparatus, the combination with a furnace of a tube extending entirely through said furnace, through which the metal is adapted to be passed and a pass for reducing the metal.

11. In metal drawing apparatus, the combination with a furnace of a tube in said 110 furnacethrough which the metal is adapted to be passed,'and-a pass for reducing the metal, said tube extending outside the furnace into the space between said furnace and I pass. v 15 In testimony whereof I have signed this specification this 31st day of' January, 1919.

/* LOUIS H. BRINKMAN.

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