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INSTRUCTION MANUAL
HW
4-Jaw Closed Center Power Chuck
・This instruction manual is for production engineers and
maintenance personnel in charge of operation of this product.
When 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 future reference.
・If any questions related to safety arise about this manual,
please confirm them with the distributor or our company.
Kitagawa Corporation
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
type
Te l . +81-847-40-0561
Fax. +81-847-45-8911
Version 1.08 (2019.09.03)
Original instructions
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Summary of Contents for Kitagawa HW-08
- Page 1 ・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 future reference. ・If any questions related to safety arise about this manual, please confirm them with the distributor or our company. Kitagawa Corporation 77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan Te l . +81-847-40-0561 Fax. +81-847-45-8911...
- Page 2 The chuck and cylinder from Kitagawa Corporatin should be used together. If you must use a part not made by Kitagawa, check with us or our distributor to be sure it is safe to do so. We will not be responsible for injury, death, ...
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Page 3: Table Of Contents
Table of Contents 1. Structural Drawing and Parts List ……………………………………………………………… 3 1-1. Type display 1-2. Structural drawing 1-3. Scope of product 1-4. Parts list 2. Important Safety Precautions ………………………………………………………… 6 3. Specifications …………………………………………………………………………………… 12 3-1. Specifications 3-2. Relationship between gripping force and rotation speed 3-3. Relationship between gripping part center height, static griping force and input force / Relationship between top jaw mass moment and gripping force loss 4. Forming Soft Jaw ……………………………………………………………………………… 17 4-1. Attachment of soft jaw 4-2. Forming soft jaw 4-3. Difference permissible range 4-4. Operating sequence of 2 pairs of jaws 5. Usage …………………………………………………………………………………………… 19 5-1. Precautions during gripping work with chuck 5-2. Precautions during gripping work in irregular shape 5-3. Precautions related to usage of jaw 5-4. Precautions related to processing 5-5. Attachment of locator and jig 6. Maintenance and Inspection ………………………………………………………………… 21 6-1. Periodic Inspection 6-2. Grease lubrication 6-3. Disassembling 7. Malfunction and Countermeasures …………………………………………………………… 23 7-1. In the case of malfunction 7-2. Where to contact in the case of malfunction For Machine Tool Manufacturers (Chapter 8) 8. Attachment ……………………………………………………………………………………… 24 8-1. Outline drawing of attachment 8-2. Manufacturing of the draw bar and the draw pipe 8-3. Manufacturing of the back plate... -
Page 4: Structural Drawing And Parts List
1. Structural Drawing and Parts List 1-1. Type display Type display as shown below Ｈ Ｗ − 0 8 Ａ 6 9 9 9 Design No. Attachment shape Straight spigot joint：ー ー5 ：A5 ー6 ：A6 ー8 ：A8 ー11 ：A1 Chuck nominal diameter (Inch) HW series Fig.1 1-2. Structural drawing T-nut Master jaw Top jaw Lever (Soft jaw.hard jaw. special jaw included) Lever pin Plunger piston Plunger Cover Draw nut Draw screw Lock nut Plug... -
Page 5: Scope Of Product
1-3. Scope of product This instruction manual is for the chuck part. Chuck Cylinder NC lathe Drain hose Flexible hose Hydraulic pump Pressure Pressure adjusting gauge screw Manual switching valve SOL. Line filter Solenoid valve Tank Fig.3 WARNING ・To prevent the work from flying, safe design, maintenance and erroneous action prevention of the hydraulic sys- tem to maintain the gripping force of the chuck is extremely important. Thoroughly read the Important Safety Precautions on and after page 6 in this manual. ・As for the cylinder, follow the instruction manual for the cylinder. -
Page 6: Parts List
1-4. Parts list 21 35 Fig.4 Table 1 Part name Quantity Part name Quantity Body Jaw attaching bolt Plunger Socket head cap screw Plunger piston Socket head cap screw Master jaw （1-3） Set screw Master jaw （2-4） Set screw Soft jaw Set screw Lever Set screw Lever pin （1-3） Set screw Lever pin （2-4） Grease nipple T-nut Lock nut locking screw 2 or 3 Cover Steel ball Plug Hex. key Lock nut Hex. key Draw screw Hex. key Draw nut Hex. key Coil spring Hex. key Connecting handle... -
Page 7: Important Safety Precautions
2 . Important Safety Precautions Important safety precautions are summarized below. Please read this section before first starting to use this product. DANGER Failure to follow the safety precautions below will result in serious injury or death. Turn off main power supply before attaching, inspecting or replacing chuck, and before adding oil. For All Users ・The chuck may start rotation Main power supply suddenly, and a part of the body or clothing may be caught. ＯＦＦ Lathe Close door before rotating spindle. For All Users ・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 ... - Page 8 DANGER Failure to follow the safety precautions below will result in serious injury or death. Do not allow the rotation speed of the chuck to exceed the maximum allowable speed limit. (Refer to pages 13-16) For All Users ・If the rotation speed of the chuck exceeds the rotation speed limit, Fly out this is very dangerous as the chuck and work will fly out. Work The input force of the chuck (piston thrust, pulling force of the draw pipe) must not exceed the allowable maximum input force. For All Users (Refer to pages 13-16) ・Input must match the specification of the chuck. Cylinder ・Adjust the hydraulic pressure to the cylin- Draw pipe der ...
- Page 9 Important Safety Precautions DANGER Failure to follow the safety precautions below will result in serious injury or death. Keep the height of the jaw within the range specified in the gripping force limit table (Refer to page 15).If you must use a jaw taller than a standard soft jaw,use less than the input (piston thrust force, For All Users draw pipe drawing force) specified in the gripping force limit table. ・Do not use a jaw of a height out of Standard soft Special top jaw height jaw height the range of the gripping force limit table or a jaw with mass moment Lower the hydraulic out of the range of the gripping force pressure when using a tall jaw limit table. The chuck will break and ...
- Page 10 DANGER Failure to follow the safety precautions below will result in serious injury or death. Use of a chuck and cylinder that cannot be used together safely may cause the cylinder to break at high pressure resulting in the chuck and work flying out. For All Users ・Check that the chuck and the cylinder are in the safe combination when using at high pressure with our company or the distributor. Especially 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. Cylinder Draw pipe Fly out ・The work slips. ・Loss of accuracy. ・The work begins to chatter. ・The machine's vibration significantly increases. ・The griping force does not rise even if Work hydraulic pressure is raised. Chuck In the case of processing a significant unbalanced work, lower the rotation speed. For All Users Unbalanced work ・Unbalanced work generates dangerous centri- fugal forces and the work could fly out.
- Page 11 Important Safety Precautions DANGER Failure to follow the safety precautions below will result in serious injury or death. The draw-bar and draw-pipe must have enough strength. (Refer to pages 25-26) The draw-bar and draw-pipe must have enough screw-in depth. For Machine Tool Manufactures The draw-bar and draw-pipe must be tightened surely. ・If the draw-bar or draw-pipe is broken, a gripping force is lost instantaneously, causing the workpiece to fly out. ・If the draw-bar or draw-pipe is screwed in inadequately, the screw is broken and a gripping force is lost instantaneously, causing the workpiece to fly out.
- Page 12 Important Safety Precautions WARNING Failure to follow the safety precautions below could result in serious injury or death. Do not modify the chuck in a way not permitted by the manufacturer. For All Users ・It may not only break the chuck but the chuck and the work may fly out, which is dangerous. ・If you attach a locator or jig on the chuck body surface, only process work in an acceptable range (Refer to page 20). Periodically supply adequate grease (Refer to page 21). Turn off power before adding grease. For All Users ・Insufficient grease supply lowers the grip- ping force, causes operation failure due to ...
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Page 13: Specifications
3 . Specifications 3-1. Specifications Table 2 Type HW-08 HW-10 HW-12 HW-15 Plunger stroke mm Jaw stroke (in diameter) mm 13.2 16.5 Allowable No.1-3 jaw (1683) (2345) (2345) (2855) (kgf) maximum kN 16.5 input force No.2-4 jaw (kgf) (1683) (2345) (2345) (2855) Maximum No.1-3 jaw (2855) (4283) (4283) (5506) (kgf) Static kN... -
Page 14: Relationship Between Gripping Force And Rotation Speed
The static gripping force is the gripping force when the chuck is at a stop. The power chuck has a mechanism to convert input force (piston thrust force, draw pipe drawing force) from the cylinder to gripping force. Therefore, the gripping force when the allowable maximum input force becomes the maximum static gripping force. However, the gripping force is different depending on the state of grease lubrication, grease in use, height of the jaw, etc. The maximum static gripping force specified in the specification is the value under the following conditions: ・The Kitagawa standard soft jaw is used as the Standard soft jaw jaw. ・The attaching bolts of the soft jaw are tightened at the specified torque. (Refer to page 9) ・The numerical values are obtained with the Kitagawa gripping force meter . The gripping ... -
Page 15: Relationship Between Gripping Part Center Height, Static Griping Force And Input Force / Relationship Between Top Jaw Mass Moment And Gripping Force Loss
Fig. 6 shows relationships between the rotation speed and the centrifugal force when using the standard soft jaw. The centrifugal force differs significantly depending on the size and shape of the top jaw and the attaching position, therefore, when the rotation speed is high, actual measurement using a Kitagawa gripping force meter is required. - Page 16 DANGER ・Keep the height of the top jaw within the range of the gripping force limit table. (Refer to Fig.8) ・If a top jaw is taller than the standard soft jaw, use it at the input force (piston thrust force, draw pipe drawing force) specified in the gripping force limit table. If it is used without lowering the input, the chuck will break and this is dangerous as the chuck and work will fly out. HW-08 INPUT FORCE PER A PLUNGER 30 28 18.6 GRIPPING FORCE LIMIT 10 20 STD.SOFT JAW STD.SOFT JAW TOP JAW MASS MOMENT PER A JAW GRIPPING CENTER HEIGHT H: mm...
- Page 17 NOTICE 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 HW-08 standard soft jaw (mass moment 47.5kg・mm), it cannot exceed 3000min (rpm), and the gripping force loss due to the centrifugal force at this rotation speed is 18.6kN (approx. 1897kgf). 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 28kN, and the required input to obtain this gripping force is 16.5kN. However, it is necessary to use at the gripping part center height H=21 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, ...
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Page 18: Forming Soft Jaw
Fig. 11. Full stroke the jaw at least once a day to check it before work or when supplying grease, etc. If it goes out of the range of appropriate stroke due to loosening of the draw nut, etc., the work may not be gripped, and this is dangerous as the work will fly out. Reference ・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 ob- tained. ・When gripping near the stroke end, the work may not be gripped some- Entire stroke times according to the deviation, etc., of the gripping part allowance of Appropriate stroke the work, and this is dangerous as the work will fly out. ・When gripping near the stroke end, the chuck may break and the chuck Fig.11 Master jaw or work could fly out. Table 4 Type HW-08 HW-10 HW-12 HW-15 Appropriate stroke range（mm）... -
Page 19: Forming Soft Jaw
Because of the chuck structural reason, the amount of difference is restricted. Use the amount of difference in the difference permissible range shown in Table 5. DANGER ・Do not use the chuck exceeding the difference permissible range of jaw strokes. Gripping the workpiece exceeding the difference permissible range breaks the chuck or results in a workpiece gripping failure, causing the workpiece to be damaged or to fly out. Table 5 Type Difference permissible range (in diameter) HW-08 6.0mm HW-10 7.5mm HW-12 7.5mm HW-15 8.0mm 4-4. Operating sequence of 2 pairs of jaws In use of Kitagawa YW cylinder, which one of two pairs of jaws operates first is not definite due to the sliding resistance ... -
Page 20: Usage
・Set the hydraulic pressure according to the shape of the work and the cutting conditions. Pipe shape work, etc., may be distorted if they are tightened at a high gripping force. 5-1. Precautions during gripping work with chuck DANGER ・When gripping a work with the chuck, do not get fingers or hands become caught. This could cause crushed or cut fingers and hands. 5-2. Precautions during gripping work in irregular shape DANGER ・If a work in an irregular shape is gripped the master jaw may be broken. Consult our company or the distributor if there is any concern. ・Cast metal, pitched shape or taper shape cannot be gripped. ・If the protrusion of the work is long, support it with a center or the steady rest. If the protrusion is long the tip of the work turns, and this is dangerous as the work will fly out. 5-3. Precautions related to usage of jaw DANGER ・If a soft jaw other than one made by Kitagawa Corporatin is used, the engagement will be inferior, and the master jaw will be deformed, the gripping precision will worsen, and the work will fly out due to gripping failure, which is dangerous. ・ Do not use a top jaw with a different serration pitch from the master jaw. The engagement of the crests of the serration will become insufficient, therefore, the serration crests will break when gripping the work, and this is dangerous as the jaw and work will fly out. ・ Do not use the soft jaw by welding to join for extension. The jaw will break due to insufficient strength and the serration part will become distorted 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. -
Page 21: Precautions Related To Processing
・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 and the tool post contact the chuck or the work due to malfunction or tape mistake, etc., and impact is given, immediately stop the rotation, and check that there are no abnormalities in the top jaw, master jaw, T nut and bolts of each part, etc. <3> Coolant ・Unless coolant with a rust preventive effect is used, rust will occur inside the chuck and gripping force drop may result. The work will fly out due to the gripping force drop and this is dangerous. 5-5. Attachment of locator and jig ・In the case of attaching the locator and the jig on the chuck body surface, tap or drill a hole in the additional process range specified in Fig. 14. Shaded part additional process possible range Fig.14 Table 6 Type A (mm) B (mm) C (mm) HW-08 18 or less HW-10 18 or less HW-12 18 or less HW-15 18 or less A, B: Additional process impossible dimension. C: Processible depth of tapping or drilling a hole. DANGER ・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 bolts which have sufficient strength. The locator or the jig may fly out, and this is dangerous. -
Page 22: Maintenance And Inspection
After lubrication, repeat opening and closing the 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 Kitagawa genuine product Genuine C H U C K G R E A S E P R O product (Kitagawa distributor of each country) K i t a g a w a c h u c k g r e a s e Conventional product... -
Page 23: Disassembling
(Refer to page 21). At this time, pay sufficient attention so as not to make a mistake in the numbers of the body, master jaw, and the plunger piston. Always tighten the bolts at the specified torque (Refer to page 9). 12.Refer to page 28 about the installation procedure. (8-4. Attachment of chuck). CAUTION ・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 damage if the chuck drops. Type Eyebolt HW-08 HW-10 HW-12 HW-15 WARNING ・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they may fly out and this is dangerous. ・Disassemble and clean the chuck at least once every 6 months or every 100,000 strokes (once every 2 months or more for cutting cast metal). If cutting powder or other substances stagnate inside the chuck, it will lead to ... -
Page 24: Malfunction And Countermeasures
7. Malfunction and Countermeasures 7-1. In the case of malfunction Check the points specified in the table below and take the appropriate countermeasure. Table 8 Defective Cause Countermeasure The chuck inside will break. Disassemble and replace the broken part. Disassemble, correct the seized part with oilstone, etc., or replace The chuck The sliding surface is seized. the part. does not Check the piping and the electric system, and if there is no operate. The cylinder is not operating. abnormality, disassemble and clean the cylinder. A large amount of cutting powder is inside. Disassemble and clean. Insufficient The draw pipe loosened. Remove the draw pipe and retighten it again. stroke of the jaw. Adjust so that the jaw is near the center of the stroke when The stroke of the jaw is insufficient. gripping the work. The gripping force is insufficient. Check that the correct hydraulic pressure is obtained. The forming diameter of the top jaw is not Form again based on the correct forming method. consistent with the work diameter. Calculate the cutting force and check that it is suitable for the The Work The cutting force is too large. specification of the chuck. slips. Supply grease from the grease nipple, and open and close the jaw Insufficient grease lubrication. several times without gripping a work. The rotation speed is too high. Swinging occurs ... -
Page 25: Attachment
For Machine Tool Manufactures Following pages are described for machine tool 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. 8. Attachment 8-1. Outline drawing of attachment Cylinder adaptor Cylinder Draw pipe Lathe rear cover Draw bar Top jaw NC lathe Chuck Support Back plate Flexible hose Drain hose Use one with large inside diameter as possible Hydraulic pump Manual switching valve Pressure adjusting screw Pressure gauge SOL. Line filter Solenoid valve Tank Return onto the oil surface Fig.15 ・Attach the manual switching valve at a position where it is easy to operate for the attaching equipment. ・Install the hydraulic unit at a position where the drain hose is not kinked and the needle of the pressure gauge is easily read. -
Page 26: Manufacturing Of The Draw Bar And The Draw Pipe
Use a pipe inside diameter as large as possible and keep the piping length as short as possible. NOTICE ・Especially, when a large sized hydraulic unit is used, excessive surge pressure is generated and the gripping force becomes large, therefore, it may result in breakage of the chuck or the lowering of endurance. Restrain the surge pressure by adopting a throttle valve, etc. 8-2. Manufacturing of the draw bar and the draw pipe Determine the length of the draw bar and the draw pipe as shown below. Cylinder A （HW-08） Chuck Draw bar Draw pipe Draw bar Draw nut Draw pipe Back plate A （HW-10〜15）... -
Page 27: Manufacturing Of The Back Plate
Table 9 Unit: mm Type HW-08 HW-10 HW-12 HW-15 Item Cylinder YW1220R YW1225R 30 φ25 φ30 M20×2.5 42.5 34.5 φ27 φ32 P min. φ42 Q max. φ52 φ65 φ42 φ55 φ34 φ32 φ42 Ｍ42×1.5 Ｍ55×2 Ｍ34×1.5 Ｍ42×1.5 Ａー12 Ａー1.5 Ａー27 Ａ＋62 Ａ＋72.5 Ａ＋49 The dimension L1 and L2 in Fig.16 are determined from the distance A between the cylinder ... -
Page 28: Attachment Of Chuck
Back plate 0.005TIR 0.005TIR Fig.18 Draw bar Draw pipe 0.005TIR Spindle 0.005TIR Back plate Spindle Table 10 Unit: mm Type HW-08 HW-10 HW-12 HW-15 Item φ70 φ80 φ80 φ110 φ170 φ120 φ120 φ195 φ200 φ200 φ285 DANGER ・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, 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 ... - Page 29 CAUTION Type Eyebolt HW-08 HW-10 ・Use an eyebolt or a hanging belt HW-12 when attaching and detaching the HW-15 chuck to and from the machine, as there is a danger of injury or damage if the chuck drops. WARNING ・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they may fly out and this is dangerous. 3. Attach the chuck matching to the attaching surface of the spindle (or the back plate). ・Remove the soft jaw and the cover then remove the plug with the handle. ・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 time, tighten the bolts at the specified torque. DANGER ・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, 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 ...
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Page 30: Other Information
Table 13 Table 14 Tightening torque HW-08 HW-10 HW-12 HW-15 Type Type for lock nut locking screw HW-08 N・m A(mm) HW-10〜15 N・m 6. Attach the cover and 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 17). 9. Other information 9-1. About standards and orders... - Page 32 Kitagawa Corporation Kitagawa Global hand Company 77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan Tel.＋81-847-40-0561 Fax.＋81-847-45-8911 ■ JAPAN DOMESTIC 1-405-1,Kita-ku,Yosino-cho,Saitama-shi,Saitama,331-9634,Japan Tokyo office Tel.＋81-48-667-3469 Fax.＋81-48-663-4678 4-15-13,Yamatomachi,Wakabayashi-ku,Sendai-shi,Miyagi,984-0042,Japan Sendai office Tel.＋81-22-232-6732 Fax.＋81-22-232-6739 2-62,Kamitakabata,Nakagawa-ku,Nagoya-shi,Aichi,454-0873,Japan Nagoya office Tel.＋81-52-363-0371 Fax.＋81-52-362-0690 3-2-9,Kitakagaya,Suminoe-ku,Osaka-shi,Osaka,559-0011,Japan Osaka office Tel.＋81-6-6685-9065 Fax.＋81-6-6684-2025 77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan Hiroshima office Tel.＋81-847-40-0541 Fax.＋81-847-46-1721 7-6-39,Itazuke,Hakata-ku,Fukuoka-shi,Fukuoka,812-0888,Japan Kyushu office Tel.＋81-92-501-2102 Fax.＋81-92-501-2103 77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan Overseas office Tel.＋81-847-40-0526 Fax.＋81-847-45-8911 ■ OVERSEAS KITAGAWA-NORTHTECH INC.
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