US2601812A - Burr remover - Google Patents

Description

J y 1, 1952 c. J. HONEN 2,601,812

BURR REMOVER Filed D60. 18, 1947 /f 2 SHEET$-SHEET 1 H C) m E '6 l8 ll '4 4 Z CARL J. HONEN C. J. HONEN BURR REMOVER July 1, 1952 2 SHEETS-SHEET 2 Filed Dec. 18, 1947 CARL J. HONEN Patented July 1, 1952 BURR REMOVER Carl J. Honen, Youngstown, Ohio, assignor to The McKay Machine Company, Youngstown, Ohio,

a corporation of Ohio Application December 18, 1947. Serial No. 792,472

4 Claims.

This invention relates to the general art of manufacturing tubes in a continuous manner and more particularly to an improved apparatus for removing the exterior burr formed on the tubing during a butt-welding process of manufacture thereof. The apparatus of the invention is particularly applicable to tube mills of the continuous electric butt-weld type and the apparatus will be so described herein although it should be obvious as the description proceeds that the apparatus is useful in connection with any continuous tube mill wherein an exterior burr is thrown up, requiring removal in providing the finished product. A primary object of the invention is the provision of an improved exterior burr trimmer for tube mills which is capable of rapid and repeated movement from operating position to retracted position and vice. versa without effecting adjustment of the apparatus which determines the depth of cut of the trimmer when in operative position. A further and more specific object of the invention is the provision in a continuous tube mill of the kind in which a continuous exterior burr is thrown up onto the tube of an improved arrangement for removing such thrown-up burr whereby the trimming tool is automatically retracted simultaneously with stoppage of the mill. This feature is highly ad vantageous in the operation of continuous tube mills since upon stoppage of the mill the metal of the burr begins to cool and to contract causing movement in the burr metal and in the cutting tool in a direction opposite to that which occurs during the cutting operation. Because the unsupported length of the cutting tool is deflected during the cutting operation due to the cutting pressure exerted, this reversal of pressure caused by the contracting burr causes the tip of the cuttingtool to move through an are, creating additional upward pressure as well as reverse pressure and as the tip is unsupported in this direction and has poor tensile qualities, it usually is fractured and must be removed for grinding or be replaced. Also; the cutting tool tip may be fractured by instantaneous reversal of the mill which commonly occurs upo n emergency stopping thereof. Further, the severed flash or burr tends to weld onto the cutting tool and if the anchor point of the severed flash is pulled away from the tool in a reverse direction the tool is also likely to be fractured.

A still further object of the invention is the provision in a continuous butt-weld tube mill having an exterior burr trimming tool of an improved mounting for such tool whereby the tool will have greater rigidity with respect to the the tool with respect to the passing burr to be removed will be facilitated.

The above and other objects and advantages of the invention will become apparent upon consideration of the following detailed specification and the accompanying drawing wherein there is disclosed a preferred embodiment of the invention.

In the drawing:

Figure 1 is a plan view of a tube mill of the continuous electric resistance butt-weld type utilizing the improved exterior burr trimming apparatus 0f the present invention;

Figure 2 is a side elevation of the mill of Figure 1;

Figure 3 is a side elevation, on an enlarged scale, of the burr trimming apparatus of the invention;

Figures 4 and 5 are views similar to Figure 3 but showing certain of the parts in section;

Figure 6 is a fragmentary view of a detail of the burr trimming assembly of the invention; and Figure 7 is a further view of a mechanical detail of the invention, the view including a schematic showing of a control circuit which may be employed, in accordance with the invention, for automatically retracting the trimming tool upon stoppage of the mill motor. 7 Referring first to Figures 1 and 2 of the drawing, the reference numeral II] indicates the main frame of an electric resistance continuousbuttweld tube mill having a pair of rotary electrodes II with a pair of backing rolls I2 and a pair of pressure rolls I 3 positioned immediately outward of the welding throat of the assembly. The mill also comprises, in accordance with usual practice, a plurality of forming and feeding roll stands one of which is shown at It and as indicated in Figure 1 of the drawing these various forming and feeding roll stands are driven by a common shaft I5 which in turn is driven by an electric motor I 6 through the multiple V belt drive I I. For illustration purposes, motor I6 is shown as being energized through a line comprised of the conductors LI and L2. As is well understood in the art the rotary electrodes I I as well as the backing rolls I2 and the pressure rolls I3 are all supported for free rotation so that the tubing is advanced through the mill solely by the forming roll stands one of which is shown at I4. It will be further understood that in the assembly shown the formed but open cleft tubing issuing from the stand I4 will be butt welded by the electric resistance method in the welding throat provided by the electrodes II and rolls I2 and the fresh soft weld will be held together by the pressure rolls l3 acting in conjunction with the welding throat until the weld metal has cooled to adequate strength. In this process a burr is thrown up both on the interior and exterior of the tubing. To remove the exterior burr I provide the apparatus now to be described.

The exterior. burr trimming; assembly of.my invention mayconveniently besupported on the housings 16 of a straightening roll stand and, as

shown, such housings may be formed with in Securely fastened to thesurclined surfaces I1. faces H in spanning relation to the two housings [6 of the straightening T011.StalldIiS.fikEYStODE-v shaped bar l8 on which is sl-i'deably mounted ablock It. To slideably move the block l9 along the bar 18 and to secure the same in: adjusted:

position I may provide a screw 20 which is rotatably secured relative to the bar I8 but which-- has screw threaded connection with the block l9 whereby-the. latter will be moved 'inlone lateral direction or the other upon rotation ofthe screw.-

Slideably mounted in suitable upwardly extending waysformed on the block.l iisancarrierll having at its upper end an integral .yoke. 22::for.

engagingopposite sides of an eccentric23r The; eccentric 23 1s keyed onto arshaft 24 whiclris journaled in brackets 25' extending upwardly from and rigidly secured to oppositeendsxoftthe bar I82 Shaft '24 has keyed to one of its ends a pinion-r25 meshing -with adrack 26 :icoupledwith formed in a lug 3L which is --integral with the carrier-2f and engaging oppositeside's of the lug 3 is the head of the screw-39 and a collar-32 which is rigidly secured tothe shank of the screw' In this manner the screw' 30 is held against axial movement relativetothelug 3| so that upon rotation thereof the tool holder 29 may be: adjusted up or down and retained in adjusted positionr Removably heldin th'e'holder 29 is on'e or more cutting tools 33 which inaccordance with usualpractice are contoured complementary to the curvature of the particular tubing being-made so that upon removal of the outward fiashor burr the finished tubing will be perfectly round in exterioroutline. In'accordance with the present inventiorrthe scarfing tools 7.33 are automatically: raisedaway from the tubing upon stoppage of the milland further, will not be again lowered onto the tubing untilthe cold and hardened burrhas passed the trimmer. The release of the tool from retracted positionmay be accomplished either manually or.

automatically in response .to the passage .ofisuffl'i cientltubing butv for simplicity, the smanuallree lease -is incorporated. in the .present.lspecifially described-embodiment; Referring again. to .Fi'ge, urel it willvbe observed rth'atthe main milli motor. I6 is energized from. a suitable" source .by the conductors .LI and L2 in. which energizing circuit thereis, positioned a control. switch -inland aJoad:

relay 35. Cylinder 21 is supplied at opposite ends with hydraulic fluid pressure under the control of a four-way valve 36 which when actuated by energization of a solenoid 31 is operative to admit fluid to the cylinder 21 in such direction as to cause the tool 33 to be retracted. When solenoid 31 is deenergized a biasing spring 38 reverses valve 36 and fiuid is admitted to the opposite end of cylinder 21 to move =-the tool-' 33 down into engagement with the work (tubing).

Solenoid 31 is arranged to be energized from aisuitable source through the closure of a contactor 39 on a relay 40 having an operating coil .1 coilriflviigziniturn, arranged to be energized from a -suitable source through the normally closed contactor'fl of the load relay 35 and in parallel with the-'contactor 42 is a normally open contactor 43 of the relay 40 to provide a holding circuit' the function of which will be presently described. In this holding circuit i a normally closed manual switch 44 Withithe control elements relatively; positioned as. shownin Figure-1 .the mill motor :15 is enere gized .-to:deliver .tubing'and the .deenergizationsof solenoid 31 indicates :that' theburr .removing;tool- 33.is in contact with the-moving work. If, W

foranyreason the production is to be interrupted as;:for;example, bystoppage of'motor :l 6 ithrough. openingaof switch-:34 thesrelay; 35 '1 will drop out closinggcontactorcfl thereby. energizing :relayvdfl which tin? turn' through: 1 contactor; 39 energizes solenoid 31 :to-uraiser thes'tool 33 Laway: from; the work; The .contactor; 43: andri normally "closed switchi provides :a holdinggcircuit for:th'e aenere: gizationr of icoil 4| rso :that aeven' after. operation" of. the millis resumed Iandcontactor :42 is again" raised :the isolenoid; 31 :will remain .energizedzto holdfithe .tool- 3312111? retracted .1positiont1 Thus; in; the event weldedr tubinghas :beeniallowed :to res. 'mainrinthe-smilli during the stoppagezthe-cona tinued retraction of. the :toor 33 aftenresumpti'orr of operation will allow: time :for the hardened burr to pass under the soarfing tool 33 tor, alternatively;

if anew. lengthofrtubing iszbein'g .run' the con; tinued retraction of the tool-will prevent the lead-.- ing end of the 'lengthl fromrteng agingth'e tools'and breakingit off When the tool-releaseis arranged: for :manual. actuation the operatormomentarily' opens the switch 44 when' proper additions *are encountered and immediately the r solenoids" 4 and 3! aredenergized to allow th'e tool 'to comesembly; The apparatus is'rsuch that thescariiiig-L tool may" readily be adjusted either tangentially;

or radially of? the tube and the apparatus .willl're-s tain its tool adjustment even .thoughth'e tool Zisl subjected toirepeated retracted movements; Elli: ther, the apparatus, provides for the automation:- traction of .the toot-upon interruption. oflthe rep-.-

eration of Jthetube .formingrand welding mill and-.7 also for the retention of thestoolw in retracted positionnntil. conditions dare-proper i fore. its release. Thisdatter feature contributes equite ma teriallyg to. the:easeaandprecision of:- control:over-- the tub'e milllasawhole. V

The above specifically v-described embodiment of J the invention should be considered as illustrative only as obviously many changes may be made therein without departing from the spirit or scope oi. the invention. Reference should therefore be had to the appended claims in determining the scope of the invention.

What I claim is:

1. In a continuous butt-weld tube mill having a mill operating motor to advance the tubing through and out of the mill and a scarfing tool to remove the exterior burr thrown up on the tubing in the welding process the combination of power means to move said tool to retracted position away from the outer periphery of the tubing issuing from the mill, means automatically responsive to deenergization of said motor to actuate said power means, holding means to maintain actuation of said power means upon resumption of energization of said motor, and manually releasable means for said holding means.

2. Exterior burr removing apparatus for continuous butt-weld tube mills comprising in combination a bar adapted to be supported transversely of and above the path of travel of tubing issuing from the mill, a block slideable along said bar and means to retain said block in adjusted position on said bar, a carrier slideably mounted on said block for up and down movement relative thereto, power means carried on said bar for moving said carrier between predetermined upper and .2

lower positions, a tool slide mounted on said carrier for vertical sliding movement thereon, means to retain said slide in adjusted position on said carrier, and a burr removing tool carried by said slide.

3. Exterior burr removing apparatus for continuous butt-weld tube mills comprising in combination a bar adapted to be supported transversely of and above the path of travel of tubing issuing from the mill, a block slideable along said bar and means to retain said block in adjusted position on said bar, a carrier slideably mounted on said block for up and down movement relative thereto, said carrier having a yoke at its upper end, a shaft journaled on said bar and having substantially parallel relation therewith, an eccentric on said shaft positioned within said yoke whereby rotation of said shaft causes said carrier to move vertically, a cylinder, a rack and pinion interconnecting the rod of said cylinder with said shaft, a tool slideable on said carrier adapted to have vertical movement relative thereto, means to secure said slide in adjusted position on said carrier, and a burr removing tool on said tool slide.

4. Apparatus according to claim 3 further including means to control the flow of fluid to said cylinder, and means operable automatically in response to the interruption of movement of tubing past said tool to admit fluid pressure to said cylinder thereby retracting said tool away from said tubing.

CARL J. HONEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,571,813 Sova Feb. 2, 1926 1,854,522 Morton Apr. 19*, 1932 1,985,049 McShane Dec. 18, 1934 2,243,197 De Fiore May 27, 1941

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