Operating Instructions Thread Rolling Heads F 001, F
Contents
1. before but turning direction is just reversed Adjustment of Head to thread length Adjustment to thread length is always done when the head is in an open position i e the head is opened in axial direction by disengaging the dog coupling 1 and 2 This brings the front position of the head forward corresponding to the height of the dog coupling a Operation with Inside Stop Stop screw 21 is adjusted to required thread length and locked by hexagon nut 22 If the component touches the stop screw 21 the dog coupling 1 and 2 is disengaged and the head opens automatically The unclamped length of the component is not of decisive importance here Operation with Outside Stop Opening operation with Outside Stop The thread length where chucking length is controlled is set by a stop on the machine which limits the forward travel of the sleeve or the threading spindle or the turret slide When the stop is reached the dog coupling is disengaged and the head opens automatically Important As opposed to opening by means of inside stop it is in this case absolutely necessary to main tain uniform component length extending beyond the clamped portion in case rolling is done against a shoulder or similar Closing of Head When the head is closed the rolls 18 are brought back into the rolling position2. 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 F 001 e g 001 Spare Parts Z ON ON a omn aloo a a a a a Ma Oa AON I oO 0 171 18 19 20 21 22 231 24 250 Pcs PO olol 43 0 00 oO 0 423 0 UOO 4 4 a oo Description Clutch or shank Spring housing Centre plate Front plate Eccentric spindles Front Plate screw Clutch plate Ball lever Handle Coil spring Hardened slides Circlip Studs Carbide bushing Hexagon nut Washer Hexagon nut Thread roll Shear pins Stop screw body Stop screw Hexagon nut Ball Set screw Washer 1 only for fixed application Rolling Heads F 001 i F 01 only for fixed application Rolling Heads K 01 1 for fixed and rotating application Assembly of Thread Rolls Remove front plate 4 apply very thin coat of grease or a thin layer of MOLYKOTE to eccentric spindles 5 as well as to the inclined surfaces on front 4 and centre plate 3 Insert rolls 18 in the order 1 2 3 or A B C in clockwise direction for left hand heads in counter clockwise direction Insert carbide bushing 14 Fit front plate 4 to this assembly and tighten screws Adjustment of Head to thread diameter The head is closed i e the teeth of the coupling of parts 1 and 2 are in complete engagement Parts 1 and 2 are spring loaded First loosen
3. Head in fixed application for F and K types The front part of the head is turned by using the handle 25 with the ball 23 if used on automatics closing is accomplished by using closing roller over a cam until the coupling rests between the spring housing 2 and shank 1 Head in rotating application only for K 01 1 The front part of the head is slowed down in its revolving motion by using an additional yoke with brake shoes the front part is then turned against the shank until the coupling rests between the spring housing 2 and the shank 1 Machining of the component Starting diameter dz to be thread rolled must be the 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 an undercut is called for the same should be chamfered according to sketch below The diameter d must be below the root diameter of the thread Also important is the accurate alignment of the head to the component 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 effectiv
4. e 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 for Acme type threads approx 20 60 m min 65 200 ft min 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 solutions with diluted ratio of 1 10 up to 1 20 perhaps with high pressure additives and thin cut ting oils Possible errors to be made 1 LMT FETTE Werkzeugtechnik GmbH amp Co KG Grabauer St 24 21493 Schwarzenbek Starting diameter selected too large or head setting too small that means overload pressure is generated which in most cases may be
5. seen at the thread end by building up a bead at the thread crests over approx the width of the rolls Chamfering also at the undercut is not in line with the rolling instructions Setting for length selected incorrect or component length variating rolls are running against a shoulder Jamming of the rolls or evidence of wear on the eccentric spindles caused be heavy dirt accumulated in the coolant Unclean thread start and possible damage to the Rolls caused by incorrect teed approach at the start of rolling Damage on the Rolls or rolling of two start threads caused by incorrect assembly of the Rolls Premature opening of the rolling head caused by the wear of the wedges for coupling in part 1 and 2 Printed in Germany No 0000 G 0111 1 DM DH Leading Metalworking Technologies BELIN Germany FETTE Phone 49 4151 12 0 KIENINGER Fax 49 4151 12 3797 ONSRUD www I mt fette com Rolling Head Hotline 49 4151 12 391 BILZ E Mail Hotline teamrollen Imt tools com BOEHLERIT Operating Instructions Thread Rolling Heads F 001 F 01 K 01 1 wan LMT FETTE k www imt 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 example F 001 S L Design for Left Hand Threads example F 001 L SL Special angle for Left Hand Threads example F 001 SL X Special design example F 001 X101 In case
6. three nuts 15 and insert between the rolls a screw plug gauge or threaded sample or if neither are available a plain plug with root diameter of the thread The front part of the head roller cage is turned with the range of the three slotted holes of the spring housing 2 until the rolls 18 become fully engaged with the screw plug gauge sample or plain plug The three nuts 15 are then retightened Should the effective diameter of the thread rolled not be correct i e the effective diameter is too large the three nuts 15 must be loosened and the front part of the head turned one half a calibration in the direction of the minus sign A rolled thread should not be over rolled or re rolled a second time If the length of the three slotted holes 2 is insufficient for the necessary adjustment and the zero mark 0 on the roller cage is at the ultimate minus setting proceed as follows Head to be adjusted to a smaller diameter Remove the three nuts 15 and ring type washer 16 The roller cage is then drawn off and turned round 120 approx in the direction of the minus sign It is then re assembled The secondary zero marking now appears on the plus side of the scale Ring type washer 16 and nuts 15 are put on again the head finally adjusted to correct size as per previous paragraph and nuts are tightened It is now possible to adjust the head to a smaller diameter Head to be adjusted to a larger diameter Same procedure as
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