US1527729A

US1527729A - Pipe-making machine

Info

Publication number: US1527729A
Application number: US445127A
Authority: US
Inventors: Leonid A Dunajeff
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-02-15
Filing date: 1921-02-15
Publication date: 1925-02-24
Anticipated expiration: 1942-02-24

Description

Feb. 24, 1925.

' L. A. DUNAJEFF PIPE MAKING MAcHIm-z Filed Feb, 15, 192i 2 sheets-sheet 1 INVENTOR.

Feb. 24 1925. @527,729

L., A. DUNAJEFF PIPE MAKING MACHINE v File Febo l5, 1921 2 Sheets-Sheet 2 INVENTOR.

Patented Feb. 24, 19:125.

UNITED STATES LEONID A. DUNAJ'EFF, 0F NEW YORK, N. Y.

PIPE-MAKING- MACHINE.

Application led February 15, 1921'. Serial No. 445,127.

To all lwhom t may camera.

, Be it known that I, LnoNin A. DUNAJEFF, citizen of Russia, and resident of New York, in the county of New York and State of New York, have invented certain new and useful action of the centrifugal force, thereby forming a hollow space inside.

T hek objectof my invention is to provide a machine which could be used for producing continuously seamless tubin in an sire'd length of any material which cou melted and poured in a rotarymold.'

In the ordinary machines 'for making seamless tubing, the material is usually cast rst into slabs of a certain length, a nd.`after wards rolled under a very heavy pressure. In my machine I am producing tubing continuously casting same in a rotary mold, so limited byI any fixed length and can produce tubes of a greater length than with other methods. f My invention is more fully described in the attached specification and drawing, in Which f- Fig. 1 is a sectional elevation of my machine, Fig. 2 is a section showing my rotary mold, Fig. 3 is a section showing finishing dbe rolls, Fig. 4 is a sectional view of a rotary'4 mclilld, Fig. 5 is a partial view of finishing ro s.

My machine consists of a metal tube 1 lined inside with some 2 which is also a heat insulator. lGrooves or corrugations 33 help to firmly secure the lining to the mold.

This tube is as shown. A pouring well 3 is located on a separate stand 4. The opening 5 in the well 3 is of the same size as the inside diameter of the tube 1. The well is lined inside with some refractory material 6.

The tube 1 has several grooved rings 7 on the outsideand a number of cooling ribs 8'. The refractory lining 2 does not extend the full length of the tube, but ends at some distance from the lower ond of the tube, which' is made slightly tapering or diverging in order to facilitate the extraction of the solidified tubular product.

pipe-making refractory material d placed in an inclined position The tubular mold 1 rests withV its grooved rings on friction wheels 9 mounted on shafts ,110. One of these shafts has a pulley 1 1 with a belt 12 connec 'ed with some suitable motor (not shown), and both shafts are connected together with 14 or with a suitable chain of gears.

This arrangement enables the two shafts l0 to be set in a fast rotary motion which is communicated through the friction wheels 9 and rings 7 to the tu ular mold 1. In order to steady its' movement and to provide a nec essary pressure between the frictional surfaces of the wheels 9 and rings 7, pressui c or steadying rings l5 are provided on a separate shaft 16, engaging the same rings 7. The shaft 16 is mounted in sliding bearings springs 18. Screws 19 may be used to regulate the spring tension and the amount of pressure between the wheels 15 and the rings 7. l

The shafts 10 are supported by bearings K20 in abracket 21 and bearings 22I inthe bracket 4.

The bracket 21-supports also bearin s 23 for shafts 24 with rolls 25. These rol s are placed concentrically with the tubular mold and at the same angle. They approach very closely with their'upper ends the lower end of the tubular mold. I

These rolls are made hollow and are providedwith a water cooling system. For this purpose pipes 26 are introduced in the openings 27 in the upper end of leach roll. These "pipes are connectedwith a sourcev of a chain 13 engaging sprockets running water, and the amount of flow may be cftrolled with va ves 28. The water, ue 'f the centrifuggl-forca is thrown against thefinside surface of the rolls, and the excess of it ilows-through a pipe 29 introduced through a lower hole 30 in the roll. The

holes

27 and 30 are smaller than the inside diameter of the roll, so that a certain amount of water inside of the rolls ,will be retained during their rotation.

In onder to let the' water pass freely fro-ni the upper ends of the rolls towardstlieir lower ends, the hubs 31 are provided with numerous holes 32.

The upper ends of shafts I24 have sprockets 25 interconnected with a chain 26. One

the'tubulai; mold 1 are set in motion, and their peripheralvelocity will correspond to the peripheral velocity of the tube 36.

The operation of my machine is as follows The molten material 34, which ordinarily would be some metal, s poured from a ladle or crucible 35 into the pouring well or funnel 3 from which it flows lar mold 3.

The opening -5 is so arranged that the stream of a molten metal will slightly contract inpassing from the well into the mold, thereby preventing any leakage of material in the space between the two. v

The mold is set in a rap-id rotary motion through thewheels 9, pulley 11 and belt 12.

'The rotation will produce the centrifugal force, and the molten metal 4will be thrown against the inside walls of the mold 3 spreading in a layer and thereby forming a `tube 36. Somewhere in the lower half of the mold, the tube will cool off sufiiciently to become solid, and insuchcondition it. will be caught by the finishing rolls `25. In order to facilitate the passage of the already hardened tube, the lower end of the mold 1. is slightly enlarged, tapering. The rolls are made to rotate all in the same direction and in' accordance with the rotation of the mold l, so ythat the tube 3G will be subjected to a rolling pressure at a more or less extended length. This rolling process will bring the outside diameter of the tube 36 to the exact desired dimension and will also givev it a smooth finish and a sufficient hardness. The tube at the lower end of the mold is still red hot and comparativel soft, so that tlie centrifugal force will deform itlto to a certain extent, as shown on Figa-3. The rolls however will bring the tube to the exact dimension and will improve its mechanical qualities.

The tubular product will come out uninterruptedly as long as molten metal is being supplied tothe mold, and the finished ,tube may becut into convenient length bv means of some suitable device, such as a circular saw (not shown), which must have a side movementjn accordance with the movement ofthe tubular product.

The tube will move out of the mold continuously due to the weight ofthe molten material behind, and for this purpose ,the` mold is set in an inclined position. .In caseswhen this movement should be positively controlled, the rolls 25 may be supplied. with igrooves or corrugations 37 arranged'spirally "''w'ith., a suitable pitch. These grooves will develop a certain pull on the tube. The

thiclmess o fthe tube is determined by the d ofgmolten material, its

vityytemperature, 'degree of inclination fthe mold and speed of its rotation. Any

" egularities in the rate of pouring further into the tu'iiii- ,For instance, my'machine may be used -to a, liquid form and can and the walls are made' cooperation with tion with a tubular viscosity,

4uct through the formation of the hollow space inside of the tube. The tube will therefore come out of the machine in an uninterrupted length, uniform and may be rolled on the outside to the exact diameter. The process is not limited to metals, but any material may be employed, which can be cast, even if it does not possess any suliicient ductility for any ordinary process 'of tube manufacturing.

making tubes from glass, lava, quartz, rubber, etc. It may also be-used in a cold process for such materials which can be reduced be solidified afterwards, like gelatinous, gluelike or cement compositions, also fibrous'and resinous compounds. Y i

I claim as my invention:

1. 'A pipe making machine, the combination with a tubular mold open on both ends,

a plurality of circular portions on'the outfor side of said ino-ld, a plurality of shafts arranged concentrically with said mold, a plurality of driving wheels on said shafts in the circular portions o said molds, means to impart a rotary motion to said mold through said driving wheels, a.

plurality o f guiding wheels in cooperation with said circular portions, and means to press said guiding wheels to said circular portions.

2. A pipe making machine, the combination with a tubular mold open on both ends, a plurality of circular portions on the outside of said mold, a plurality of shafts concentric with said molddriving wheels on said shafts in cooperation with the circular members of said mold, means to imparted rotary motion to said mold through said driving wheels, a plurality of rolls arrange concentrically with a tubular `product receivedfrom said mold, means to impart a 'rotary motion to said rolls, and means to cool off. said rolls.

3. A pipe making machine,

mold open on both ends, means to rotate said mold, a pouring well stationed near4 one end of said ino1d, a refractory and heat insulating lining inside of said mold near saidpouring well extending through a portion of the length of said mold', a heat absorbing remaining portion of said mold, a\diverging opening in said mold, and

the` combinasaid diverging opening.

means to extract a tubular prod- 4. A pipe making machine, the combination with a tubular mold o en on both ends, means to` rotate said mol a ouring well stationed near one end of saidp mold, a refractory and heat insulating linin extending through a portion of the lengt of said mold, a heat absorbing remaining portion of said mold, a diverging opening in said mold, cooling devices on the outside of said mold, and a plurality of straightening and finishing devices in a close proximity to said mold.

5. In a pipe making machine, the combination with a tubular mold open on both ends, means to rotate said mold, a refractory lining inside of said mold extending through a portion of its length and forming a straight cylindrical tubular aperture, a heat absorbing portion of said mold forming a' continuation of said cylindrical aperture, said heat absorbing portion beine formed with diverging walls forming a iverging opening, and means to continuously straighten the tubular product from said mold.

6. In a pipe making machine, the combination with a tubular mold open on both ends, means to rotate said mold, means to introduce a liquid material into one end of said mold, and a 3diverging opening at the other end said diverging opening being of a larger diameter than the finished product from said liquid material. y

7. In a pipe making machine, the combination with a tubular mold open on both ends, means to rotate said mold, the main operative portion of said mold having a straight cylindrical surface inside, means to introduce a liquid material into said main portion of the mold from one end, and means to extract a finished roduct from the other e'nd of said mold, said) other end being in `the form of a diverging opening of a larger diameter than the finished product.

8. In a ipe making machine, the combi,- nation wit a tubular mold open on both ends, means to rotate said mold, means to introduce a liquid material into said mold from one end, said intake end having a straight cylindrical surface inside extendin through the main operative portion of said mold and adapted to form a pipe from said liquid material, and an enlarged diverging opening on the other end of said mold.

9. In a pipe making machine, the combination with a tubular mold open on both ends, means to introduce a liquid material into said mold, means to support said mold in an inclined position at an angle suicient to cause a movement of said material and of a finished product through and from said mold, a plurality of rolls adapted to straighten and finish the tubular product from said mold, said rolls being arranged co` axially with said mold, and means to introduce a cooling medium inside of said rolls.

10'. In a pipe making machine, the combination with a tubular mold open on both ends, means to rotate said mold, means to introducel a liquid material into said mold, and a plurality of hollow rolls arranged coaxially with the tubular product from said mold and adapted to straighten and finish said tubular product, means to introduce water in the upper portions of said hollow rolls, and means to extract said Water from the lower portions ot said rolls.

11. In a pipe making machine, the combination with a tubular mold open on both ends and placed in an inclined position, means to rotate said mold, an open well placed at the upper end of said mold, an aperture in the lower portion .of said Well located in opposition to the aperture in the upper end of said mold, a plurality of comparatively long rolls arranged .concentrically around the tubular product from said mold, means to rotate said rolls, and means to control the extraction of the linished material from said mold.

Signed at New York, in the county of New York and State of'New York, this 11th day of February, A. D. 1921.

LEON ID .A` DUNAJ EFF.