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Analysis of the gripping force, input force and rotation speed using Fig. 8 is carried out

as shown below.

・

For example, in the case of QB306 standard soft jaw (mass moment 75.9kg

・

mm), it

cannot exceed 5500min

-1

(rpm), and the gripping force loss due to the centrifugal

force at this rotation speed is 38kN (approx. 3875kgf). The required static gripping

force for the dynamic gripping force (gripping force loss by static gripping force -

centrifugal force) to become 1/3 of the static gripping force is 57kN, and the required

input to obtain this gripping force is 22kN. However, it is necessary to use at the

gripping part center height H=16 mm or less.

・

If the gripping part center height H is high, it is necessary to lower the static gripping

force.

・

If the top jaw mass moment is large, the rotation speed needs to be lowered.

・

If the rotation speed is high, the gripping force loss due to the centrifugal force

becomes large. The centrifugal force is proportional to the square of the rotation

speed.

The required static gripping force and input force required at the rotation speed in use are

predicted from Fig.8, however, it contains a number of hypothetical conditions. Therefore, it

is necessary to only use these as reference, and the processing conditions must be

determined after trial cutting without fail.

・

In the case of inside diameter gripping, keep the input to 1/2 of the allowable

maximum input or less. In the case of inside diameter gripping, the length of

engagement of the master jaw and the dovetail groove is shorter when

compared to the outside diameter gripping, therefore, the chuck will break, the

work will fly out and this is dangerous.

・

In the case of using only 1 jaw for gripping reduce the input force by 2/3 or

more. If 2 jaws are used for gripping reduce the input force by 1/3 or more. If it

is used without lowering the input, the input which is normally applied evenly

onto 3 of the jaws is concentrated onto 1 or 2 of the jaws. Otherwise the chuck

will break, the work will fly out and this is dangerous.

Содержание QB300

Страница 1: ...n a beginner uses this product receive instructions from experienced personnel the distributor or our company Before installing operating or maintaining this equipment carefully read this manual and the safety labels attached to the equipment Failure to follow these instructions and safety precautions could result in serious injury death or property damage Store this manual near equipment for futu...

Страница 2: ... as shown below depending on the damage of risk including the seriousness of the harm that could result Please sufficiently understand the meanings of these terms and follow the instructions for safe operation Safety Alert Symbol The triangle is the safety alert symbol used to alert you to potential safety hazards that could result in injury or death Indicates a hazardous situation which if you no...

Страница 3: ...specified in this manual please confirm them with our company or distributor before performing them Guarantee and Limitation of Liability The guarantee period of this product is 1 year after delivery Use the parts delivered by Kitagawa Corporation for all the parts including consumable parts We will not assume responsibility for injury death damage or loss caused by usage of parts not manufactured...

Страница 4: ...peration 4 2 Jaw change reverse turn 5 Forming Soft Jaw 25 5 1 Forming soft jaw 5 2 Forming soft jaw with outside diameter gripping 5 3 Forming soft jaw with inside diameter gripping 5 4 Forming method when you use forming jig 6 Usage 35 6 1 Precautions during gripping work with chuck 6 2 Precautions during gripping work in irregular shape 6 3 Precautions related to usage of jaw 6 4 Precautions re...

Страница 5: ... 9 9 Attachment 46 9 1 Outline drawing of attachment 9 2 Manufacturing and attachment of draw pipe 9 3 Attachment of chuck 10 Other Information 57 10 1 About standards and orders 10 2 Information about markings of product 10 3 About disposal ...

Страница 6: ...5 1 Structural Drawing and Parts List 1 1 Type display Type display as shown below Fig 1 1 2 Structural drawing Fig 2 ...

Страница 7: ...lying safe design maintenance and erroneous action prevention of the hydraulic system to maintain the gripping force of the chuck is extremely important Thoroughly read the Important Safety Precautions on and after page 8 in this manual As for the cylinder follow the instruction manual for the cylinder ...

Страница 8: ...rew 1 5 Plunger nut 1 21 Attaching bolt 6 6 Draw nut 1 22 Socket head cap screw 6 7 Cover 1 23 Socket head cap screw 3 8 Coil spring 1 24 Socket head button screw 3 9 Handle 1 25 Steel ball 1 10 Back plate 1 26 Grease nipple 3 11 Stud ASSY 3 27 Seal 3 12 Stop pin 3 28 Eyebolt 1 13 Coil spring 3 29 Hex key 1 14 Coil spring 3 30 Hex key 1 15 Shaft 1 31 Hex key 1 16 Parallel pin 1 32 Hex key 1 ...

Страница 9: ...lose door before rotating spindle If the door is not closed you may touch the rotating chuck or the work may fly out which is very dangerous In general the safety interlock function which allows rotation only when the door is the manual mode or the test mode During spindle rotation do not turn off hydraulic pump power supply and do not operate switching valve Cutting off hydraulic pressure causes ...

Страница 10: ... must not exceed the allowable maximum input force Refer to pages 17 22 Input must match the specification of the chuck Adjust the hydraulic pressure to the cylinder so that the input force which determines the gripping force of the chuck does not exceed Excessive input force can lead to breakage of the chuck which is very dangerous as the chuck can work can be damaged and fly out If you use the c...

Страница 11: ...moment out of the range of the gripping force limit table The chuck will break and the chuck and work will break and fly out When the protrusion of the work is long support it with the steady rest or center If the protrusion is long the tip of the work can turn and the work fly out Determine the gripping force required for processing by the machine tool manufacturer or user and check that the requ...

Страница 12: ...when the cylinder of our company and a high pressure chuck of other company are combined confirmation is necessary If one of the abnormal events shown below occurs during operation immediately stop the machine and consult with our company or the distributor The work slips Loss of accuracy The work begins to chatter The machine s vibration significantly increases The griping force does not rise eve...

Страница 13: ...re to form the jaw in the same diameter as the gripping diameter of work piece The chuck may break and the chuck or work could fly out Height regulation of soft jaw Refer to page 25 Use the soft jaw which has total height within values in the following list of overturning moment The chuck may break and the chuck or work could fly out Type QB306 QB308 QB310 QB312 Type of soft jaw SB06BB SB06BB 036 ...

Страница 14: ...insufficient or excessive the bolt will break which is dangerous as the chuck or work will fly out Fix the lathe spindle or the chuck when you tighten bolts Your hand could slip and get injury when you work without fixing the spindle You cannot control the torque by a hex key You must use a torque wrench for torque control Tightening torque is moment of force when you tighten a bolt Tightening tor...

Страница 15: ...ing force will be lost instantly which is dangerous as the work will fly out If the draw pipe is unbalanced vibration occurs the screw is broken and the gripping force will be lost instantly which is dangerous as the work will fly out Use a cylinder with a lock valve safety valve check valve incorporated in case of sudden hydraulic pressure drop due to blackout malfunction of the hydraulic pump et...

Страница 16: ...wer hydraulic pressure lowers the gripping precision and causes abnormal wearing and seizing etc This is dangerous as the work could fly out from a drop in the gripping force Do not operate the machine after drinking alcohol or taking medication Do not operate the machine wearing gloves a necktie and other loose clothing or jewelry Dangerous since these lead to operation mistakes and misjudgment D...

Страница 17: ...9 43 51 Gripping range outside diameter gripping mm φ8 140 φ15 180 φ23 210 φ32 250 Mass standard soft jaw included kg 12 6 23 2 35 0 56 0 Moment of inertia kg m2 0 058 0 173 0 318 0 745 Matching cylinder S1246 S1552 S1875 S2091 Maximum hydraulic pressure with matching cylinder MPa 2 8 2 6 2 7 2 7 kgf cm2 28 6 26 5 27 5 27 5 Balance quality standard soft jaw not included G6 3 Storing temperature Op...

Страница 18: ...ipping force specified in the specification is the value under the following conditions The Kitagawa standard soft jaw is used as the jaw The attaching bolts of the soft jaw are tightened at the specified torque Refer to page 13 The numerical values are obtained with the Kitagawa gripping force meter The gripping position of the gripping force meter is at a position 1 2 of the height of the soft j...

Страница 19: ...ight of the soft jaw top surface height from the chuck surface to the top surface of the jaw To avoid serious accidents caused by the chuck or work flying out Determine the gripping force required for processing by the machine tool manufacturer or user and check that the required gripping force is provided before processing The gripping force of the chuck must not exceed the maximum static grippin...

Страница 20: ... and this is dangerous Vibration is generated if there is unbalance due to the work and the jig etc Vibration decreases process precision and shortens the working life of the chuck even possibly breaking it Correct the unbalance by using a balance weight etc or lower the rotation speed for use In the case of heavy cutting at high rotation speed vibration is easily generated in the same manner as t...

Страница 21: ...vier the centrifugal force generated at the top jaw will increase It is necessary to examine the dynamic gripping force considering the centrifugal force and to use the machine at a rotation speed that can withstand the cutting force G Center of mass of the top jaw m Mass of the top jaw r Distance from the center of mass of the top jaw to the chuck center H Gripping center height Fig 7 Keep the he...

Страница 22: ...21 Fig 8 ...

Страница 23: ...large The centrifugal force is proportional to the square of the rotation speed The required static gripping force and input force required at the rotation speed in use are predicted from Fig 8 however it contains a number of hypothetical conditions Therefore it is necessary to only use these as reference and the processing conditions must be determined after trial cutting without fail In the case...

Страница 24: ...aw position in the arrow direction CCW 45 At this time the jaw is completely mounted The stop pin inside master jaw is engaged to the soft jaw Check the soft jaw is not turned when it is turned in right and left before removing the jaw change handle 4 2 2 Removing of jaw With the jaw change handle turned to the jaw change reverse turn position turn the soft jaw 90 CCW The soft jaw can be removed i...

Страница 25: ...nge handle Though the jaw can be mounted even if there is no handle be sure to use the jaw change handle since it is necessary to check that the master jaw is completely engaged to the soft jaw at the handle turning position If the work piece is gripped with the master jaw and soft jaw inadequately engaged there is a danger of scattering the jaw and work piece Don t start the spindle with the jaw ...

Страница 26: ... Ｔｈe total height Fig 10 of the soft jaw is regulated by the jaw over turn moment Consequently use the standard soft jaw or high soft jaw semi standard When using the soft jaw higher than the high soft jaw the jaw may be broken thus resulting in a danger of scattering the jaw or work piece Fig 10 Table 3 Type Type of soft jaw Ｈ QB306 SB06BB 31 SB06BB 036 41 MAX QB308 SB08BB 39 SB08BB 036 57 MAX QB...

Страница 27: ...soft jaw Refer to Fig 11 If this area is cut the jaw is broken thus resulting in a danger of scattering the jaw or work piece Fig 11 Table 4 Type Type of soft jaw A B QB306 SB06BB 24 68 SB06BB 036 QB308 SB08BB 28 76 SB08BB 036 QB310 SB10BB 31 88 SB10BB 060 QB312 SB12BB 34 92 SB12BB 070 ...

Страница 28: ...g ring The gripping face for the gripping maters is to be R face in the same direction Even if R face is in the same direction don t grip the work piece in the line remarkably touched Don t grip the work under single touch of profile or narrow touch of jaw If inadequately formed the stop pin is broken thus resulting in a danger of scattering jaw or work piece Fig 12 ...

Страница 29: ...When gripping the work use it by keeping the position of the master jaw within the appropriate stroke range Gripping in the center of the stroke is the most stable for the mechanism and the best precision can be obtained When gripping near the stroke end the work may not be gripped sometimes according to the deviation etc of the gripping part allowance of the work and this is dangerous as the work...

Страница 30: ...t of the forming plug Periphery in 3 equiparation and mount the bolts Use the ring having the thickness which is not distorted and bolts which has a sufficient strength 3 Process of the plug gripping part for forming Open the master jaw with the switch valve to grip the ring with bolts so that the ring can grip the jaw at the center of jaw stroke From the part witch grips the forming plug Machinin...

Страница 31: ...lic pressure during forming the same as during processing of the work or slightly higher When the plug distorts lower the hydraulic pressure or change the plug into a shape which does not easily distort 6 Trial cutting Remove the plug for forming and grip the work to check the jaw stroke Implement trial cutting to check the process precision and that there is no slip etc Contacting on the gripping...

Страница 32: ...e various outside diameter dimensions for dimensions of forming parts It is convenient to process tapping in the center part of the plug and to guide with a bolt etc 3 Process of the plug gripping part for forming Close the master jaw with the switch valve to grip the plug Adjust the ring with the plug so that the ring can grip the jaw at the center of jaw stroke From the part witch grips the form...

Страница 33: ...k or slightly higher Additionally in the case of inside diameter gripping it is necessary to use the input at 1 2 of the allowable maximum input or less When the ring distorts lower the hydraulic pressure or change the ring into a shape which does not easily distort 6 Trial cutting Remove the ring for forming and grip the work to check the jaw stroke Implement trial cutting to check the process pr...

Страница 34: ...center of the jaw stroke Never hole at forming inhibit range Refer to page 26 3 Preparation for gripping the jig Operate the switch valve and maximize the opening of the jaw 4 Gripping of the jig for forming Operate the switch valve and maximize the opening of the jaw Then operate the switch valve to insert the jig for forming into the hole of the soft jaw to grip At this time grip by pressing the...

Страница 35: ...7 as the diameter of the gripping part of the work and process to be surface roughness at 6s or less 6 Trial cutting Remove the jig for forming and grip the work to check the jaw stroke Implement trial cutting to check the process precision and that there is no slip etc Contacting on the gripping surface is to be 2 points contact of the side A and the side B when gripping ...

Страница 36: ...ork and the cutting conditions Pipe shape work etc may be distorted if they are tightened at a high gripping force 6 1 Precautions during gripping work with chuck When gripping a work with the chuck do not get fingers or hands become caught This could cause crushed or cut fingers and hands 6 2 Precautions during gripping work in irregular shape If a work in an irregular shape is gripped the master...

Страница 37: ...w will be deformed the gripping precision will worsen and the work will fly out due to gripping failure which is dangerous Do not use the soft jaw by welding to join for extension The jaw will break due to insufficient strength due to welding As a result the engagement will worsen the serration crests will break and this is dangerous as the work will fly out ...

Страница 38: ... appropriate for the dynamic gripping force and machine rigidity 2 Interference contact impact Before starting work check that the top jaw locator work etc and the tool and the tool post etc do not interfere at low rotation and then start processing Do not allow anything to impact the chuck jaw and the work The chuck will break and this is dangerous as the chuck and work will fly out If the tool a...

Страница 39: ...312 42 90 30 or less A B Additional process impossible dimension C Processible depth of tapping or drilling a hole The chuck can be modified only in the manufacturer permissible range This will not only break the chuck but the chuck and work may fly out which is dangerous Provide a countermeasure against flying out dwell pin etc due to centrifugal force to the locator or the jig and attach with bo...

Страница 40: ...jaw several times without gripping work 2 Grease to use Use the designated grease specified in Table 7 If grease other than the designated grease is used sufficient effect may not be obtained Table 7 Genuine product CHUCK GREASE PRO Kitagawa genuine product Kitagawa distributor of each country Conventional product Kitagawa chuck grease Conventional product Molykote EP Grease TORAY Dow Corning only...

Страница 41: ...ease and anti rust oil Applicable range Designated grease Antirust agent applied to the product at the delivery First aid measures After inhalation Remove victim to fresh air If symptoms persist call a physician After contact with skin Wash off with mild cleaners and plenty of water If symptoms persist call a physician After contact with eyes Rinse with plenty of water If symptoms persist call a p...

Страница 42: ...10 5 Remove the wedge plunger Remove the wedge plunger 2 to the body 1 rear side 6 Remove the draw nut In case of 6 chuck Loosen the set screw 20 on the wedge plunger 2 and remove the coil spring 8 and the steel ball 25 7 Loosen the socket head cap screw 22 and remove the plunger nut 5 and draw nut 6 from the wedge plunger 2 In case of chuck except 6 size Loosen the socket head cap screw 22 and re...

Страница 43: ...in in which the set screw 18 is unified to the parallel pin 16 is provided 2 Remove the shaft 15 from the master jaw 3 Ｒｅmove the stop pin 12 and coil spring 13 and 14 from the master jaw When reassembling coat enough grease and repeat reverse steps of disassembly Use an eyebolt or a hanging belt when attaching and detaching the chuck to and from the machine as there is a danger of injury or damag...

Страница 44: ...nd replace any part that is worn or cracked After inspection apply sufficient grease in the designated areas and reassemble After assembling measure the gripping force according to the method on page 17 and check that the specified gripping force is obtained If you stop the machine for a long period of time remove the work from the machine If you don t the work can drop due to a drop in the hydrau...

Страница 45: ...ent grease lubrication Supply grease from the grease nipple and open and close the jaw several times without gripping a work The rotation speed is too high Swinging occurs due to incorrect alignment of cores of work feeder steady rest tail stock etc Lower the rotation speed to a speed at which the required gripping force can be obtained Align the cores sufficiently to eliminate such swinging Preci...

Страница 46: ...top using the machine Continuous use of a broken product or a defective product may cause a serious accident by the chuck or the work flying out Only experienced and trained personnel should do repairs and fix malfunctions Repair of a malfunction by a person who has never received instruction from an experienced person the distributor or our company may cause a serious accident 8 2 Where to contac...

Страница 47: ... manufacturers personnel who attach a chuck to a machine Please read following instruction carefully when you attach or detach a chuck to machine and please sufficiently understand and follow the instructions for safe operation 9 Attachment 9 1 Outline drawing of attachment Fig 15 ...

Страница 48: ...efer to Fig 15 If the hydraulic oil stagnates inside the cylinder oil leakage occurs which may cause a fire Install after removing the dust inside the pipe completely Add a filter to the pressure supply line If foreign matters gets inside the cylinder this is dangerous since the rotation valve of the cylinder will seize the hose will tear off and the cylinder will rotate This is also dangerous as ...

Страница 49: ... 38 5 0 060 QB312 S2091 M100 2 35 35 95 0 036 4 5 M100 2 A 36 0 071 The dimension L in Fig 16 is determined from the distance A between the cylinder adapter and the back plate Example In the combination of QB306 S1246 and when A 800mm the draw pipe length L is to be L A 41 800 41 841mm At the time of the screw process of the dimension a the precision is to be JIS 6H and 6h 6g matching the screw of...

Страница 50: ... the screw of the draw pipe is loose vibration may occur resulting in breakage of the screw If the screw breaks the gripping force will be lost instantly which is dangerous as the work will fly out If the draw pipe is unbalanced vibration occurs the screw is broken and the gripping force will be lost instantly which is dangerous as the work will fly out 2 Processing of draw nut 1 Remove the socket...

Страница 51: ...e the bolt will break which is dangerous as the chuck or work will fly out Use the bolts attached to the chuck and do not use other bolts However if you must use other bolts not provided by Kitagawa use bolts that have at least a strength classification of 12 9 10 9 for M22 or more and be sure they are long enough Table 10 Bolt size Tightening torque M5 7 5 N m M6 13 N m M8 33 N m M10 73 N m M12 1...

Страница 52: ... plate and the spigot joint diameter can be raised by processing them after mounting to the installed machine Process the chuck attachment spigot joint diameter of the back plate at the target value A 0 01 in the dimension A of Table 10 Fig 19 shows the case of the JIS short taper standard Fig 19 Table 11 Unit mm Type QB306 QB308 QB310 QB312 ISO A1 No 5 No 6 No 6 No 8 φA H6 φ140 φ170 φ220 φ220 φB ...

Страница 53: ...olts that have at least a strength classification of 12 9 10 9 for M22 or more and be sure they are long enough Table 12 Bolt size Tightening torque M5 7 5 N m M6 13 N m M8 33 N m M10 73 N m M12 107 N m M14 171 N m M16 250 N m M20 402 N m Determine the dimension dimension φE in Fig 19 of the back plate so that the plunger nut end surface contacts the back plate and stops when pulling the plunger n...

Страница 54: ... of the instruction manual for the cylinder for other items about the cylinder 2 Attach the cylinder to the spindle or the cylinder adapter Check the run out of the cylinder and if it is normal attach the hydraulic pipe Move 2 to 3 times at low pressure 0 4 MPa 0 5 MPa 4 5 kgf cm2 and set the piston at the forward end and turn off the power supply Use an eyebolt or a hanging belt when attaching an...

Страница 55: ...pping force and the work flying out 4 Attach the chuck matching to the attaching surface of the spindle or the back plate Turn the handle for connection to make a state that the chuck closely contacts the spindle attaching surface of the lathe In the case of adjusting the centering of the chuck lightly hit the body side face with a plastic hammer Tighten the chuck attaching bolts evenly At this ti...

Страница 56: ...n of the wedge plunger at the cylinder forward end is the position when the dimension A in Fig 20 becomes as shown in the table below At this time check that the reference mark of the master jaw meets the line of the outside of the stroke mark Refer to page 28 A click stop rotation stopper is also attached to the draw nut so complete adjustment at the position where this response is felt Fig 20 ...

Страница 57: ... check the run out of the chuck Keep the periphery run out and the end surface run out of the chuck at 0 02mm T I R or less Full stroke the jaw and check that the reference mark of the master jaw is completely within the entire stroke area Refer to page 28 Bolt tightening steps Fig 21 ...

Страница 58: ...ion 10 1 About standards and orders This product is based on the following standards or orders Machinery directive 2006 42 EC Annex I EN ISO 12100 2010 EN1550 1997 A1 2008 10 2 Information about markings of product Fig 22 ...

Страница 59: ...58 10 3 About disposal Ultimate disposal of this product should be handled according to all national laws and regulations ...

Страница 60: ......

Страница 61: ...del QB300 series Models QB306 QB308 QB310 QB312 Serial number See original declaration Manufacturer Kitagawa Corporation 77 1 Motomachi Fuchu shi Hiroshima 726 8610 Japan Authorized complier Mark Jones Financial Director in the community UNIT 1 THE HEADLANS DOWNTON SALISBURY WILTSHIRE SP5 3JJ UNITED KINGDOM The essential health and safety requirements in accordance with the Supply of Machinery Saf...

Страница 62: ...epublic Tel 420 603 856 122 Fax 420 549 273 246 KITAGAWA EUROPE GmbH Romania Office https www kitagawa global ro Strada Heliului 15 Bucharest 1 013991 Romania Tel 40 727 770 329 KITAGAWA EUROPE GmbH Hungary Office http www kitagawa global hu Dery T u 5 H 9024 Gyor Hungary Tel 36 30 510 3550 Asia Contact KITAGAWA INDIA PVT LTD https www kitagawa global in Plot No 42 2nd Phase Jigani Industrial Area...

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