Operating Instructions Thread Rolling Heads FU 4-1
Contents
1. Undercut Tolerance for the starting diameter Once the accurate starting diameter determined by a test rolling operation has been found then this should be considered as the maximum dimension if the thread has been rolled just up to its crest and the effective diameter is approx at the maximum dimension within the permissible thread tolerance Among others the tolerance of the starting diameter is depending to what extent the thread has been rolled to As a guide for standard threads with tolerance class 6 g the following may be used starting diameter tolerance half effective diameter tolerance Rolling Speed According to component profile and spindle speeds available the following rolling speeds are re commended for V type threads approx 20 60 m min 65 200 ft min for Acme type threads approx 15 30 m min 50 100 ft min The rolling speed is arrived at by figuring the same as tor the cutting speed Rolling operation The feed rate of approach should be equivalent to the pitch of thread to be rolled After engagement over 3 4 thread pitches the head itself takes over the feed movement The support respectively the adaptor sleeve should be set up tor easy movement in either direction at any rate Coolants and lubricants Recommended coolants and lubricants are those which are also used for cutting operations i e solu tions with diluted ratio of 1 10 up to 1 20 perhaps with high pressure additives and thin cutting oi2. an undercut is called for the same should be chamfered according to sketch below The width of the undercut depends upon the lead of the rolls 1 K approx 2 3 x pitch 2 K approx 3 3 x pitch The diameter d must be below the root diameter of the thread Also important is the accurate alignment of the head to the component
3. 18 Oo oO wo BR l 0 O 323 3a a _ hk oZ 2o 21 22 23 24 25 26 27 28 29 30 31 33 34 35 36 37 382 392 40 41 42 43 44 45 46 47 48 49 50 1 only for Typ FU 45 1 OW MD WWM YM MW Hi a a Ali AH AH WF WW OD OON MD W W fH Ow 0 0 Description Flange Dog coupling Operating ring Spring housing Gear ring Gear sectors Centre plate Front plate Sleeve Pins Coil spring Brake ring Spring pads Eccentric spindles Spacing studs Ball bearing cage Axial washer Thread rolls Ball bearings Needle roller bearnings Keys Coil spring Allen screws Allen screws Allen screws Studs Allen screws Hexagon nuts Washer Spring washer Pins Locking pins Stop screw body Stop screw Hexagon nut Ball for handle Hexagon nut Handle Fitting keys Fitting keys Locking Pin Schnorr circlip Grub screw Grub screw Thrust bearings Cover plate Coupling wedge Allen screws 2 only for fixed application Rolling Heads FU 4 1 m FU 45 1 for fixed and rotating application Assembly of Thread Rolls Remove Front Plate 8 apply MOLYKOTE or similar lubricating agents to the Roll Bearing surfaces if possible For type FU 45 1 Assemble Thrust Bearings 47 together with the axial Washers 17 and fix them on both sides of the Rolls Assemble Rolls in the sequence as marked 1 2 3 or A B C in clockwise direction for left hand threads in counter clockwise direction Insert Needle
4. Roller Bearings 21 put on Front Plate 8 and tighten screws Setting of the Rolling Head to thread diameter The Rolling Head has to be set to thread diameter when it is in closed position that means this is done by turning the Gear Ring by means of Ball Handle 38 and the Dog Coupling 2 gets into locking position and there will be a wide gap between Flange 1 and Dog Coupling 2 The 6 Hexagon Nuts 29 have to be loosened By using a Setting Gauge a Thread Sample or a Plain Plug having the root diameter of the thread to be rolled the Gear Ring 5 is turned by means of Ball Handle 38 in such a way until the outside diameter of the Rolls touch in Setting Gauge After that the Hexagon Nuts 29 are tightened up in some cases it may be necessary when setting that a slight correction has to be made on the guide scale towards minus The accurate setting should be determined by test rolling If the effective diameter reached is too big or too small then the head setting has to be corrected towards minus or plus A rolled thread should never be overrolled a second time Setting of the Rolling Head to thread length The thread length is set basically when the Rolling Head is in opened position to do this it is necessary that the Operating Ring 3 is pushed towards Flange 1 Between Flange 1 and Dog Coupling 2 there is now only a very small gap to be noted a Opening by means of Internal End Stop Stop Screw 36 is to be set to the r
5. equired thread length and is locked by Hexagon Nut 37 In doing this the length of the component extending beyond the clamped portion is of no importance in this case b Opening by means of External End Stop over Operating Ring The thread length is set by an End Stop for use with an additional yoke keeping the length of component extending beyond the clamped portion uniform When the yoke touches the End Stop the Rolling Head opens automatically Important As opposed to opening by means of Internal End Stop it is in this case absolutely necessary to maintain uniform component length extending beyond the clamped portion in case rolling is done against a shoulder or similar Closing of the Rolling Head In case of fixed application the Rolling Head is closed by means of Ball Handle 38 and turning of the Gear Ring 5 In case of revolving application closing of the Rolling Head is accomplished by quick brake action in split second time this is done by pushing the operating ring by means of the additional yoke against the Brake Ring 12 Machining of the component Starting diameter dz to be thread rolled must be equivalent to the effective diameter Deviations are possible depending upon type of component material being used The starting diameter arrived at now should never be increased The components have to be chamfered under y 10 25 against the axis and must be concentric An undercut at the thread run out is not required If
6. ls Possible errors to be made 1 Starting diameter selected too large or head setting was too small that means an overload is generated which in most cases may be seen at the thread end by building up a bead at the thread crests over approx the width of the rolls 2 Chamfering also at the undercut is not in line with the rolling instructions 3 Setting for length selected Incorrect or component length variating rolls are running against a shoulder 4 Jamming of the rolls or evidence of wear on the eccentric spindles caused be heavy dirt accumulated in the coolant 5 Unclean thread start and perhaps damage of the rolls caused by incorrect feed approach Damage on the Rolls or rolling of two start threads caused by incorrect assembly of the Rolls 7 Premature opening of the Rolling Head caused by wear on the Wedges for the Coupling 49 or the Dog Coupling 2 Wedges for the Coupling 49 can be used several times more by tuming them around O Fig 1 Example of Assembly for Rolling Heads in FU design E Separate Parts to be assembled into groups fig 1 Apply ample grease to Ball Bearings to avoid drop out when putting into the Gear Ring fig 2 The gears on the Gear Sector then point to the centre E The gears are to be brought into engagement fig 3 attention is to be paid to uniformness and perhaps marking O is to be noted Gearings to be brought into approx centre position E Assembly gro
7. up fig 3 to be put on Lower Assembly Group fig 4 The 0 marking has to be in the area of the Guide Scale Care should be taken to ensure that there is no gap within the ball track because otherwise the Ball Bearings could drop out Fig 3 LMT FETTE Werkzeugtechnik GmbH amp Co KG Grabauer St 24 21493 Schwarzenbek Germany Phone 49 4151 12 0 Fax 49 4151 12 3797 www I mt fette com Rolling Head Hotline 49 4151 12 391 E Mail Hotline teamrollen Imt tools com Printed in Germany No 0000 G 0111 1 DM DH Leading Metalworking Technologies BELIN FETTE KIENINGER ONSRUD BILZ BOEHLERIT Operating Instructions Thread Rolling Heads FU 4 1 FU 45 1 wan LMT FETTE ae www Iimt fette com IMPORTANT In the case of re ordering of Spare Parts please state Rolling Head Type and Serial No Please note marking on the Front Plate S Special angle L Design for Left Hand Threads SL Special angle for Left Hand Threads X Special design Ke Rolling Head for rolling of Serrations example FU 4 1 S example FU 4 1 L example FU 4 1 SL example FU 4 1 X101 example FU 4 1 Ke X 102 In case of re ordering of Rolls please state the Roll Code No which is marked on the letter side of the Roll in addition to the dimension e g for rolling head FU 4 1 e g 34 Spare Parts Z fe O OIN O B WM Pcs O a a a a OORA OIN 177
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