US1115495A - Cross-rolling mild. - Google Patents

Description

R. E. BROCK.

GROSS ROLLING MILL.

APPLICATION FILED 11110.4, 1911.

1,1 1 5,495. Patented Nov. 3, 1914.

2 SHEETSSHEET 1.

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, 77m @0641; iiim UNITED STATEs PATENT OFFICE.

RICHARD E. BROCK, or MoNEs's'EN, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH STEEL PRODUCTS 00., 0F PITTSBURGH, PENNSYLVANIA, A CORPORATION VANIA.

Specification of Letters Patent.

OF PENNSYL- Patented Nov. 3, 1914.

Application filed December 4, 1911. Serial No. 663,893.

1 "0 all whom it may concern:

Be it known that I, RICHARD E. 311001;, a citizen of the United States, and resident of -Mon.essen, in the county of Westmoreland lowing to be a full, clear, and exact description thereof.

My invention relates to cross-rolling or expanding mills.

In the manufacture of tubing, more particularly seamless tubing, where the tube is rolled on a mandrel in a plug mill it is necessary to give the tube a pass through an expanding or cross-rolling mill in order to bring the tube to the proper gage and remove any source or imperfections on the interior of the tube caused by the rolling in the plug-mill.

The object of my invention is to provide a mill of this character in which the tube is so supported during the cross-rolling as to guard its exterior against scratches, while "less power is required, and greater ease of adjustment of the rolls is obtained.

To these ends my invention comprises generally stated, a mill of this character comprising the cross-rolls with an adjustable idle-roller forming one side of the pass, and means for holding the tube against the idleroller with the axial line of the pass outside the mean center line of the main rolls,-where by I obtain substantially the effect of a 3- roll machine and secure greater steadiness of operation, the tube turning in contact with 1 the idle-roll and reducing the liability of I scratching of the same.

In the accompanying drawings, Figure 1 is an end elevation partly in section of my improved mill; Fig. 2 is a vertical section'; and Fig. 3 is an enlargedview of the pass; Fig. 4 is a similar view of a modified form of ass.

IE1 the drawings the numeral 2 designates thehousing of the mill which'may be of any suitable construction and journaled within said housing are the cross-rolls 3 and 4, set at an angle to each other in the ordinary manner. The shape of these cross-rolls may vary and 1 do not limit myself to any articular size or shape. The bearing bloc s 5 and 6 are contained within the guides 7 of the housings and said bearing blocks are adustable by means of the ordinary mechan1sm comprising the screw-bar 8 carrying the worm-wheel 9 which is engaged bythe worm 10. I

The idle-roll 11 is mount-ed in suitable bearings in the adjustable bearing blocks 12. Each bearing-block is mounted in the guides 13 and its position in said guides is controlled by the screw-bar 14 connected thereto. The upper end of the screw-b'arhas the bevel-pinion 15 which is engaged by the bevel-pinion 16 on the shaft 17 which carries the hand-wheel 18. 'By turning the handwheel 18, the roll 11 may be adjusted as desired.

. A support 19 may be employed if desired at the bottom of the pass formed by the rolls 3,.4 and 11, and said support is mounted on the vertically adjustable block 20 mounted in guides 21. The lever 22 engages said block 20 and said lever is connected up to an adjusting screw 23 for controlling the position of the block 20 and the support 19 carried thereby.

The mandrel-bar 24 is supported in any suitable manner and said mandrel-bar carries the mandrel-plug 25.

In cross-rolling a tube in my improved mill, the tube is fed to the rolls in any suitable manner, and as the tube passes throu h the mill the rollers 3 and 4 act upon t e outer Walls of said tube, and in rolling it will be observed that the center or axial line of the billet. when in the pass is above the mean center line of the rolls 3 and 4. Accordingly in rolling the said rolls 3 and 4 act to force the tube toward the upper idle-roll ation and the amount of power required is reduced to a minimum. By having the tube bearing in contact with the idle-roll, the wear on the idle-r011 is ver light, and the expense of renewal of stationary guides is obviated. v The lower guide 19'does not come in con tact-with the tube during the rolling ope] ation, and in fact might be dispensed with so far as the practical operation of my mill is concerned. I j

The rolls 3 and I are readily adjustable in order to maintain the proper pass-line, while at the same time the adjustment of the idleroll 11 may also be readily accomplished. The idle-roll 11 bears only at a point of its periphery against the tube and consequently the friction is greatly reduced and the power required in the reduction of the tube is accordingly likewise reduced.

By having the roll 11 adjustable vertically the pressure on the tube can be quickly and accurately regulated even while the tube is passing through the mill. This obviates the necessity of adjustment of the large rolls 3 and 4 except to maintain the pass-line above the mean center of said rolls as shown in Fig. 3.

In Fig. 4 I have illustrated a modified form of my invention in which the idle-roll is maintained below the'pass-line, and said pass-line is carried below the main center of the main rolls.

What I clai'm is': i

1. In a cross-rolling mill, the combination of the housing, cross-rolls mounted therein, a vertically-adjustable idle-roll between said cross-rolls, and a mandrel-plug within the pass, the axial line of the pass being outside the mean center of the cross-rolls toward said idle-roll, whereby said cross-rolls tend to hold the tube against said adjustable idleroll.

2. In a cross-rolling mill, the combination of the housing,.cross-rolls mounted therein, a vertically adjustable idle-roll atthe top of the'pass between said cross-rolls, and a mandrel-plug within the pass, the axial line of the pass being above the mean center of the cross-rolls, whereby said cross-rolls tend to .h0ld.the tube against said idle-roll.

In testimony whereof, I the said RICHARD E. BROOK have hereunto set my hand.

RICHARD E. BROOK.

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