US1808370A

US1808370A - Apparatus for extruding seamless brass and copper tubes

Info

Publication number: US1808370A
Application number: US421344A
Authority: US
Inventors: Nyle R Munson
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-17
Filing date: 1930-01-17
Publication date: 1931-06-02
Anticipated expiration: 1948-06-02

Description

June 2, 1931. N. R. MUNSON APPARATUS FOR EXTBUDING SEAMLESS BRASS AND COPPER TUBES Filed Jan. 17. 1930 2 sheets-sheet l ATTORNE June 2, 1931. N, R MUNSQN l '1,808,370

APPARATUS FOR EXTRUDING SEAMLESS BRASS AND COPPER TUBES Filed Jan. 17, 1930 2 Sheets-Sheet 2 INVENTOR liatentediJune 2, 1931 I UNITED STATESL PMEN'I-v OFFICE N'YLE R. MUNSO-NVOF WATERBURY, CONNECTICUT APPARATUS F013. EXTRUDING snAMLEss BRASS AND corran TUBES Appiication mea January 17, 1930. serial Nb. 421,344.

continuously drawing away the solid tube thus formed. l j

One object of thisinvention is to provide an apparatus of the above nature including a vessel containing molten metal and located within a furnace, said vessel having a die plug at its lower end through which the molten metal ows under high pressure into a tubular casing.

A further object is to provide an apparatus of the above nature in which the molten metal iiowing from said die plug is continuously congealed within a surrounding casing and drawn out therefrom by a draw bench or other suitable device.

A further object is to provide an apparatus lofthe above nature in which the'congealing casing is provided with an end cap to prevent the escape of molten metal from the end of the casing at the beginning of the tube form- 2'5".v ing process.

A further object is to provide an apparatus of the above naturewhereby seamless tubing of metal, such as copper and copper alloys,

may be produced directly from"molten metal without making cores, casting or scalping billets, and in which the repeated pointing, annealing and drawing operations formerly required in the production of tubes are entirelyeliminated.

A further object is to provide an apparatus of the abovenature which will be relatively4 simple in construction, inexpensive to manufacture,.easy to manipulate, compact, and

'very eflicient and durable in use.

With these and other objects in view, there has been illustrated on the accompanying drawings one form in which the invention may be convenientljT embodied inpractice.

Fig.\1 represents a longitudinal` vertical sectional View taken through the apparatus.

Fig. 2 is a fragmentary horizontal sectional view of the same.

Fig. 3 is a fragmentary vertical sectional apparatus.

i view taken through the delivery end of the The vessel 10 1s provided at its top with a l removable cover-plug 11 through which molten metal 12 maybe poured therein. The

numeral 13 indicates a pipe through which compressed air may be supplied'for forcing the molten metal 12 out of the pot through a bottom outlet die plug 14 having a conical outer surface for releasably fitting withina conical opening 15 in the bottom of the ves- The die plug 141s provided with an @10uf gated mandrel 16 formed integral therewith and extending away from said vessell 10. T he mandrel 16 is surrounded by a cylindrical casing 17, the outer endof whichis provided with a plurality of outwardly extending lugs 18 for detachable engagement with' va plurality of inwardly extending lugs 19 formed in a cap member 20, said cap member vhaving a shoulder 21 for tting loosely against the annular' extremity 22 of the casing 17.

AIn order to cool the end portion of the `casing 17, provision is made of a water-jacket 23, through which water is circulated by means of an inlet pipe 24 and an outlet pipe 25. By the use ofthe water jacket 23, the molten'metal 12 iowin'g into the casing 17 will be caused to congeal in tubular form in thespace between the mandrel 16 and the outer portion of the tubular casing 17 surrounded by said water jacket 23. The outlet die plug 14 has an arc-shaped curved lower aperture 26 (see-Fig. 5) for connecting the interior of the vessel 10 with the tube forming space within the casing 17 In order to center the mandrel 16 accurately within the casing 17, provision is made of a plurality of adjustable scew bolts 27 four leo j `31 is adapte in number in this instance, which'are adapted to be screwed into corresponding threaded apertures in the casing 17 at a point intermediate between the plug 14 and the cap 2O where the metal is still in the molten condition.

In order to detachably hold the casing 17 tightly against the opening 15 of the vessel 10 surrounding the die plug 14, the casing 17 is provided with an enlarged collar 28 adapted to beembraced by a pair of elongated jaws 29 forming an integral part of said vessel 10, said jaws 29 having inturned ends 30, as clearly shown in Fig. 2. After the collar 28 of the casing 17 has been arranged wi-thin the jaws 29 in the position shown in Fi 2, a vertical U-shaped wedge to be driven downwardly between the collar 28 and the inturned ends 30 of the jaws 29 until the casing 17 has been forced against the vessel 10 with asuflicient degree' of tightness to prevent -leakage of molten metal.

. The vessel 10 is preferably enclosed within a furnace 32, preferably oil-burning, for maintaining the temperature in the vessel 10 above the melting point of the metal being employed. The exhaust gases from the burning of the oil are adapted .-to leave the furnace through a horizontal :passage 33 controlled by a damper 34.

In order to permit the entire length of the casing 17 to be heated by the hot gases in the furnace 32 when the molten metal is first lpoured into the vessel 10 so that saidmolten metal will completely fill the casing 17 and cap 20, the furnace 32 -is pro-V *videdA with a reducedsection 34a, in which a rectangular end-door 35 and a U.shape d inner door 36 are located. The door 36 v1s located just inside the position of the Waterjacket 23 and is connected by a chain 37 to said end-door 35, said chain being ada ted to ride over a pair of

pulleys

38 and 39, t e latter pulley having an operating handle 40.

By means of this construction 1t will be seen that when the operator desires to close the door 36 and open the door 35, it will only be necessary to rotate the handle 40 in a counter-clockwise direction, the weight 'of the door 36 causing it to move downwardlyl into the position shown in Fig. 3, after which water will be supplied to the jacket 23. The heat being thus removed therefrom the end of the casing and the cap 20 will then berapidly cooled and the metal therewithin will be congealed to form a solid plug 41 which may be readily engaged by the prongs of a drawbench, not shown. Any air contained in the casing will escape through the loose joint between the cap shoulder 21 and the 4casing ex tremity 22.

Operation l In operation molten metal 12 will irst be poured into the vessel 10 to the desired level and the cover plug 11 clamped securely in position. The

doors

35 and 36 will then oc cupy the relative positions shown in Fi 1, the water jacket 23 being empty. ompressed air will then be admitted through the pipe 13 and the metal Awill flow rapidly through the aperture 26 in the die plug 14 into the space in the casing 17 surrounding the mandrel 16, completely fillingthe casing 17 and cap 20.

The operator will then rotate the handle 40 in a counter-clockwise direction causing the U-shaped door 36 to drop and the rectangular outer door 35 to rise, said doors then occupying the relative positions shown in Fig. 3. A supply of cooling water will then be admitted to the jacket 23 surrounding the end of the casing 17, through the inlet pipe 24, said water being withdrawn through the outlet pipe 2 5. This will cause the metal within the cap 20 and the end portion of the casing I17 to rapidly congeal, as shown in Fig. 1. until the lugs 19 thereon are out of alinement with the lugs 18 on the end of the casing 17, whereupon the cap may be readily removed by pulling it outwardly.

The Vtongs of the draw-bench will then be clamped over the solid plug 41 forming the end of the tube, and the completed seamless tube will vbe continuously drawn out of the casing 17 as rapidly as it is congealed therein.

It will,` be understood that casings and mandrels of various different sizes' may be interchangeably connected to the apparatus in order `to produce a tube of any desired interior and exterior diameters.

While there has been disclosed in this specification one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifica-tions and embodiments coming within the scope of the following claims. I

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent, is:

1. In an apparatus for continuously casting a metal tube, a vessel containing a supply of molten metal, a casing connected with The operator will then twist the cap 20 said vessel, a mandrel within said casing, a

water jacket and the outer lsection of said casing "from the hot gases of said furnace.

2. In an apparatus for continuously casting a metal tube, a heated vessel containing a supply of molten metal and having an outlet in its lower portion, a tubular casing connected to said vessel and surrounding said outlet, an apertured die plug fitted into said outlet, an elongated stationary mandrel -se'-A cured to said die plug, means tocause said metal to congeal in tubular shape in said casing around said mandrel, whereby the congealed tube may be continuously drawn out of said casing.

3. In an apparatus for continuously casting a metal tube, a heated vessel containing a supply of molten metal and having an outlet in its lower portion, a tubular casing connected to said vessel and surroundin said outlet, and apertured die plug fitted in o said outlet, an elongated stationary mandrel integral with said die plug, means to cause said metal to congeal in tubular y"shape in said casing around said mandrel, whereby the congealed tube may be continuously drawn out of said casing. Y 1 f 4. In an apparatus orvcontinuously casting a metal tube, a vessel containing-a supply of molten metal, a casing connected-with said vessel, a mandrel within said casing, means for cooling said casing to cause the metal tocongeal in the outer en'd thereof, whereby a solid tube may be continuously drawn .from

said casing, and a cap member for initially closing the outer end of said casing and causing the formation of a solid plug on the eX- tremity of said tube when the molten metal is lirst admitted to -said casing. j

5. In an apparatus ,for continuously casting a seamless metal tube, a casing having a erally therefrom around said casing,\said jaws having inwardly extending lugs for engag- 8. In an apparatus for continuously castving a seamless metal tube, a heated vessel containing molten metal, said vessel yhaving a side outlet in its lower portion, a casing h aving an enlarged shoulder surrounding said outlet, a mandrel within said casing, said casing having a plurality of jaws extending laterally therefrom around said casing, said jaws having inwardly extending lugs for engaging said casing, and a U-shapedwedgeA member fitting around said casing and adapted to be ydriven between said enlarged shoulder and said lugs,A whereby said casing will have a tight joint with said vessel.

9. In an apparatus-for continuously casting a seamless. metal tube, a heated vessel containing moltenmetal, said vessel having a side outlet in its lower portion, a casing hav- Y ing an enlarged inner end surrounding said.

outlet, a mandrel within sald casing, said-casing having a plurality of aws extending laterally therefrom around said casing, said jaws having inwardly extending lugs for engaging said casing, and a wedge member fitting around said casingand adapted to be driven between said enlarged inner end and said lugs, whereby said vcasing will have a tight joint with said vessel. l

In. testimonywhereof, I have affixed my signature to this specification.

MUNSON.

YLE R.

stationaryA mandrel located therewithin,

means for supplying molten metal to one end of said Casin said metal being caused to congeal into tu ular shape within said casing and around said mandrel, whereby said congealed tube may be continuously drawn out of the other end of said casing.

6. In an apparatus for continuously castl ing a metal tube, a casing having a stationary mandrel located therewithin, means for supplying molten metal to one end of said casing, means for cooling said casing to cause the metal to congeal intotubular shape around said mandrel, whereby said congealed tube may be continuously drawn out of the other end of said casing, and adjustable means in said casing for engaging said interior mandrel to vary the position thereof.

l 7. In an apparatus for continuously casting a seamless metal tube, a heated v ssel containing molten metal, said vessel aving a side outlet in its lower portion, a casing having an enlarged inner end surrounding said outlet, a mandrel within said casing, said vessel having a plurality of jaws extending lat-