US1223282A

US1223282A - Method of making tubes.

Info

Publication number: US1223282A
Application number: US5063715A
Authority: US
Inventors: Wallace E Hughes
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-09-14
Filing date: 1915-09-14
Publication date: 1917-04-17
Anticipated expiration: 1934-04-17

Description

Patented 17 1917.

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WALLACE E. HUGHES, 0F PHILADELPHIA, PENNS YLVANIA.

METHOD or MAKING runes.

Specification of Letters Patent.

Patented Apr. 1'7, 1917.

Application filed September 14, 1915. Serial No. 50,6 37.

To all whom it may concern:

Be it known that I, WALLACE E. HUG-Hus, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in the Method of Making Tubes, of which the following is a specification. o

My invention relates to certain improvements in the process of manufacturing tubes of iron, steel, brass, copper, or other metal, and in the mechanism for carrying. out said process.

One object of the invention is to improve the process of making seamless metallic tubes.

A further object of the invention is to roll the tube flush on a mandrel as a core in asingle heat.

A still further object of the invention is to use a mandrel of a uniform diameter throughout, .which is the form on which the tube is produced.

A further object is to produce tubes of a uniform diameter or tapered as desired.

, Referring to the drawings, which are in Figure 1, illustrates a mandrel on which is located the usual hollow ingot;

Fig. 2, 1s a view showing the tube in section after being rolled and prior to its I of a uniform diameter throughout and the size of the interior of the tube to be formed. The mandrel may be of any length desired. 2 is the hollow ingot from which the tube is made. This hollow ingot is fitted on one end of the mandrel, as in Fig. 1, after being heated to the degree required and is passed between the

rolls

3, 3 with the mandrel. These rolls may be the rolls of a 3-high stand or a 2 high stand, or may be the first rolls of a. continuous mill, according to the particular mill in which my process 1s carried out.

The ingot is reduced to the proper diameter and gage flush with the mandrel and of the length required during the rolling operatlon. After the tube is rolled to the desired diameter it is acted upon to loosen the mandrel, to allow it to be withdrawn from the formed tube.

One method which may be used to Withdraw the tube from the mandrel is to-hammer or tap the tube longitudinally at :r, or

longitudinally and circumferentially, with sufficient force to p: 'oduce an enlargement or buckle 4 in the tube at one side, as shown in the drawings. This causes the tube to draw away from the mandrel at this point.

Then, by rolling the tube laterally, the

buckle is carried a1 m nd it, which causes the tube to be slightly onzarged so that the mandrel can be withdl awn. This enlargement is almost imperce tible, yet is sufiicient to free the mandrel.

The lateral rolli 1g may be accomplished between two surfazes under pressure so as to carry the buckle entirely around the mandrel, as in Figs. 3 and 4 either in a straight line or spiral.

Recesses or slight projections may be formed on the surfaces which are arranged at an incline with I aspect to the longitudinal line of the tube, s) as to cause the tube to travel longitudinaly in order to progressively press the tube to release it from the mandrel.

The abovedescri ption refers to a cylindrical tube, but my invention may be carried out in making tul es oval, square, or other shapes in cross sec ;ion, using a particularly shaped mandred in the first step of the process and using a hai imer with the mandrel as an anvil to slightly enlarge the tube dur ng the second step of the process.

By using a tap :red mandrel and so designing the passes of the rolls, the tube may be rolled tapered on the inside and outside, or either on the inside or outside, as desired, and the outer cont an: of the tube at one end may beoval in closs section tapering toa round at the opposite end; thetube tapered on the outside is limited inlength by the circumference of the rolls.

By the use of my improved process, tubes may be made of greater lengths and of a more uniform gag than heretofore and at a lower cost of manufacture, and limited as to length only by tl ethickness of the metal of the hollow ing OtllSGd and the capacity of the mill.

Tubes made 2.5 above described are I less tubes now made.

stronger, gage for ga e, than drawn seamhe tubes thus formed are-finished by any of the ordinary methods. If, for any reason, the mandrel adheres to the tube then the tube can be iven a flash heat so as to expand the tube wlthout affecting the mandrel and then can be further treated to break the adhesion.

I claim 1. The process of making a seamless tube, said process consisting in taking a hollow ingot, forcing the ingot over a mandrel of a uniform diameter throughout and reducing the ingot to form a tube, then actin on the metal of the tube in alon itudina line so as to slightly enlarge the tu e, and then carthroughout and reducing the ingot to form a tube on said mandrel, then hammering ;th'e

tube on a longitudinal line so as to forma slight buckle or enlargement on the tube,

then rolling the tube laterally'to carry the buckle around the mandrel, freeing the tube therefrom, and finally withdrawing the mandrel from the finished tube. WALLACE E'.;HUGHES.