light force weld heads series 50m
Contents
1. B 2 Electrode holders Unibond installation 2 2 Unitip installation 2 Electrode materials 3 1 Electrode tips Unibond installation 2 2 2 1 Electrode Holder B 2 Electrodes Table of 1 6 F INDEX 50MF models Table 1 2 SOMF Series description 1 2 Foot actuated Models 50MF Series Description 1 2 Force welding as 3 1 Fore WO enge iii IG E 3 1 Getting Started a eoe pne aei in 2 1 H How to reach us ee iii I Installation Optics assembly 2 3 PIDE Lotes con evisos f cae 2 1 Unibond electrode holders and tips 2 1 Unitip electrode holders and tips 2 1 M Major components 1 4 Microwave circuit precautions 2 5 Model 50MF Light Force Weld Head Desc FOL aas cci irt int 1 2 Model 50MFUB Light Force Weld Head with parallel gap adjustment Desc 1 3 O Operating procedure 3 1 Operation ria 3 1 Optics assembly installation 2 3 Outline dawn A 2 A 3 P Parallel gap welding variables 3 1 Area of electrode face 3 1 LIGHT FORCE WELD HEAD SERIES 50M 990 137 INDEX 1 INDEX Duration of puls2. 990 137 Side View 1 Light Force Weld Head Figure A LIGHT FORCE WELD HEAD SERIES 50M A 2 APPENDIX A TECHNICAL SPECIFICATIONS Optic mounting post 63 50 2 50 91 44 3 60 7 112 78 4 44 Spacer gt O Collar 4775 63 50 2 50 1 88 68 33 2 69 REF 254 00 10 00 Figure A 2 Light Force Weld Head Front View LIGHT FORCE WELD HEAD SERIES 50M 990 137 A 3 APPENDIX B ELECTRODE HOLDER CONVERSIONS A conversion kit contains all of the necessary parts to convert Model 50MF to Model SOMFUB In addition aUTA Unitip Adapter is available to convert a Unibond electrode holder for use with Unitip electrodes Table B 1 lists the Conversion Kits Table B 1 Conversion Kits Function Part No Contents Convert SOMF to SOMFUB 12 078 01 Electrode Flexure Assy 4 31966 01 Ship Kit 4 80940 01 containing Block Assy Adapter 4 31948 01 Electrode Sleeve 4 30365 01 2 each 8 flat washers 8 lock washers 8 32x1 4 socket button cap screws assorted socket wrenches Convert Unibond electrode 12 048 02 Set of two adapters holder for use with Unitip UTA electrodes LIGHT FORCE WELD HEAD SERIES 50M 990 137 B 1 APPENDIX B ELECTRODE HOLDER CONVERSION
3. Series 50M Foot Actuated Heads figure 1 1 Table 1 1 lists the features of each model Figure 1 1 Model 50MF Light Force Weld Head Typical Table 1 1 Series 50MF Models Stock Electrode Electrode M Model Number Holder Type Application 50MF 2 50MF XXX 50 Unitip Welding 50MFUB 2 50MFUB XXX HESOUB Unibond Welding NOTE The XXX in the Stock number is the design sequence LIGHT FORCE WELD HEAD SERIES 50M CHAPTER 1 DESCRIPTION Model 50 Light Force Weld Head Model 50MF Stock Number 2 50MF XXX uses only Unitip electrodes for micro welding Applications include welding gold or copper ribbon as thin as 0 0008 cm 0 0003 inch to make interconnections in microwave and hybrid packages and welding sub miniature components such as beam lead diodes to flexible printed circuit boards and ceramic substrates Welding Force is adjustable from 0 039 to 1 23 N 40 to 1000 gf The Model 50 is used with a power supply Voltage sensing wires connected to the 50 Electrode Holder provide the feedback required by the power supply Model 50 Electrode Holder Stock Number 12 077 XX figure 1 2 standard on the Model 50 is a low inertia compliant electrode holder which ensures that the Unitip electrode will maintain the Preset Force on the work piece as it deforms during the welding process The 50 compliance feature functions in the Preset Force range from 0 0
4. UTM222L Unitip Electrode Molybdenum 0 457 mm W x 0 508 mm D 0 018 inch W x 0 020 inch D with 0 051 mm 0 002 inch gap UTM224L Unitip Electrode Molybdenum 0 508 mm W x 0 508 mm D 0 020 inch W x 0 020 inch D with 0 010 mm 0 004 inch gap UTM237L Unitip Electrode Molybdenum 0 508 mm W x 0 762 mm D 0 020 inch W x 0 030 inch D with 0 018 mm 0 007 inch gap LIGHT FORCE WELD HEAD SERIES 50M 1 6 990 137 CHAPTER 2 GETTING STARTED Section I Planning for Installation The outline dimensions of the weld head are contained in Appendix A Technical Specifications Section Il Installation of Electrode Holder and Tip Do not modify the electrode holders or attach additional mechanisms to the moving parts ofthe head Doing so may hurt welding performance damage the head and void the warranty Unitip Electrode Installation Model 50MF 1 Open the electrode holder by loosening the Electrode Clamping Screw 2 Hold the left half of the Electrode Holder open using the left hand Using the right hand insert the Unitip into the Electrode Holder Each half of the Electrode Holder has been machined with concave grooves to accept 3 mm 0 125 inch diameter electrodes 3 Gently squeeze the Electrode Holder closed and then rotate the Unitip so that the vertical line formed on the tip by the insulation layer lies exactly between the two Electrode Hol
5. ii innen iii Safety NOTES Wl tret TEE iv CHAPTER I DESCRIPTION une dni 1 1 1 1 Section I Model Descriptions 1 2 Foot Actuated Series 50M Heads 1 2 Model SOME Light Force Weld Head nn ee eg 1 3 Model 50MFUB Light Force Weld Head with Parallel Gap Adjustment 1 3 Section Major Component een 1 4 Section IV ACCESSOriES cuarta 1 5 CHAPTER 2 GETTING 2 1 Section I Planning for tii pe 2 1 Section II Installation of Electrode Holders and Tips ua kan tret inet 2 1 Unitip Electrode Installation Model SOME nase adidas 2 Unibond Electrode Installation Model SOMFUB eee eene 2 2 Section Optic Pod Microscope Installation u a een 2 3 Section IV Power Supply Connections 2 4 Connechon to Power SOU nein 2 4 Microwave Circuit ieh 2 5 CHAPTER 3 OPERATION a een 3 1 Parallel Gap Welding Variables zn 3 1 Maler al nee ee ee 3 1 o PT 3 1 gro m 3 1 DO Re een 3 1 Pulse DD ss ene nee ee er 3 1 anon iia 3 2 LIGHT FORCE WELD HEAD SERIES 50M 990 137 CHAPTER 4 USER MAINTENANCE 4 1 Section 4 1 Section I Maintenance Procedures id 4 1 Unitip and Unibond Electrode Dressing een arten 4 1 Unitip and Unibond Electr
6. 39 to 1 23 N 40 to 125 gf Br er Model UTM 112C Unitip Electrode Model 50MFUB Light Force Weld Head with Parallel Gap Adjustment Model 50MFUB Stock Number 2 50MFUB XXX uses parallel gap Unibond electrodes Applications include fine wire or ribbon bonding and tacking of hybrid lids to their packages in preparation for seam sealing Welding Force is adjustable from 1 23 to 9 807 N 125 to 1000 gf Model HESOUB Unibond Electrode Holder figure 1 3 Stock Number 12 078 XX standard on the SOMFUB features flexures which allow the Unibond electrodes to conform to uneven work surfaces The Electrode Gap Adjustment Knob feature permits a 0 10 cm 0 040 inch maximum electrode gap spacing Figure 1 3 Close up of the Model HE50UB Unibond Electrode Holder with Unibond Electrodes LIGHT FORCE WELD HEAD SERIES 50M 990 137 1 3 CHAPTER 1 DESCRIPTION Section Ill Major Components Figure 1 4 identifies the major components of the Light Force Weld Head Vertical mounting post Optic mounting block assembly Locking handle Locking handle Optic mounting post Locking handle Electrode holder Electrode VJ Figure 1 4 50M Series Weld Head Components LIGHT FORCE WELD HEAD SERIES 50M 1 4 990 137 CHAPTER 1 DESCRIPTION Section IV Accessories Table 1 2 lists the Accessories available for the Light force We
7. DESCRIPTION Table 1 3 Electrodes MODEL DESCRIPTION EU1000 RWMA 2 Unibond Electrode 28 6 mm 1 inch long with 0 508 mm x 0 762 mm 0 020 x 0 030 inch deep face EU1002 RWMA 2 Unibond Electrode 50 8 mm 2 inch long with 0 508 mm x 0 762 mm 0 020 x 0 030 inch deep face EU2030M Unibond Electrode Molybdenum Copper Clad Shank 28 6 mm 1 inch long with 0 508 mm x 0 762 mm 0 020 x 0 030 inch deep face EU2030ML Unibond Electrode Molybdenum Copper Clad Shank 50 8 mm 2 inch long with 0 508 mm x 0 762 mm 0 020 x 0 030 inch deep face UTMIIIC Unitip Electrode Molybdenum 0 229 mm W x 0 254 mm D 0 009 inch W x 0 010 inch D with 0 025 mm 0 001 inch gap UTMI12C Unitip Electrode Molybdenum 0 254 mm W x 0 254 mm D 0 010 inch W x 0 010 inch D with 0 051 mm 0 002 inch gap UTM222C Unitip Electrode Molybdenum 0 457 mm W x 0 508 mm D 0 018 inch W x 0 020 inch D with 0 051 mm 0 002 inch gap UTM224C Unitip Electrode Molybdenum 0 508 mm W x 0 508 mm D 0 020 inch W x 0 020 inch D with 0 010mm 0 004 inch gap UTMIIIL Unitip Electrode Molybdenum 0 229 mm W x 0 254 mm D 0 009 inch W x 0 010 inch D with 0 025 mm 0 001 inch gap UTMI12L Unitip Electrode Molybdenum 0 254 mm W x 0 254 mm D 0 010 inch W x 0 010 inch D with 0 051 mm 0 002 inch gap UTMIS2L Unitip Electrode Molybdenum 0 254 mm W x 0 127 mm D 0 010 inch W x 0 005 inch D with 0 051 mm 0 002 inch gap
8. GETTING STARTED Section IV Power Supply Connections Connection to Power Source 1 Reference figure 2 5 Place one end of each 2 welding cable over the threaded stud found at the lower back of the head Using the hardware supplied in the Shipping Kit secure each cable with a flat washer and lock nut Connect the terminal at the other end of each welding cable to the power supply or transformer using the screw flat washer and lock nut supplied with that unit as shown Ensure that the washers are placed under the screw heads not Power supply or transformer Head Threaded stud Lock nut Flat washer 2 welding cable 2 Flat washer Figure 2 5 Welding Cable Transformer Power Connections between the bus bars and terminals Tighten all of the connections NOTE Do not cross cables when connecting the weld head to a power supply This will cause the power supply Overload Light to come on preventing weld current from occurring 3 If the power supply has closed loop feedback connect the Voltage Sensing Cable on the 50MF and the SOMFUB the power supply as illustrated in the power supply manual 4 Connect the Weld Head Firing Switch Cable to the matching Firing Switch Cable coming from the power supply For the Model 125 Power Supply the Firing Switch Receptacle is located on the front 2 4 panel LIGHT FORCE WELD HEAD SERIES 50M 990 137 CHAPTER 2 GETTING STARTED Microwave Circuit Prec
9. PTER 5 REPAIR SERVICE Service Repair at Plant Unitek Miyachi provides a quick turn around repair service for both warranty and non warranty repairs Call the Customer Service Department at the telephone number shown in the Foreword of this manual Please include information concerning the type of problem which you are experiencing Include with the shipping information the name and telephone number of the person whom we should call with the estimated cost of repairs LIGHT FORCE WELD HEAD SERIES 50M 990 137 5 1 990 137 APPENDIX A TECHNICAL SPECIFICATIONS LIGHT FORCE WELD HEAD SERIES 50M 1 APPENDIX A TECHNICAL SPECIFICATIONS Dimensions in millimeters inches Weld Head Dimensions AWOS 00 91 07 907 060 01 kK k 18 9 46211 0 6 9 622 Jejeuuelq le t vz9 i 92 Ly ooeds Jasn xeyy viz 9619 uonisod pJepuejs Jo eJ 6 70 80 61 ONN 02 J9ayseM 3 jnu sday T A quiesse 181 Z6 Sp panpe euondo e z SjueseJdai peyseq 9 gp Cw ta ee ee N abc pa 5t 3 1 Et ir ah POLE 9901 9 onisod INN 02 7291 SC Lv E Simes ei S4 Zb 1 299 Jeu 00 72 00 019
10. USER S MANUAL 990 137 22 MIYACHI REVISION B May 2008 UNITERK LIGHT FORCE WELD HEADS SERIES 50M Model Number Stock Number 50MF 2 50MF 000 2 50MFUB 000 Copyrighted 2002 Miyachi Unitek Corporation The engineering designs drawings and data contained herein are the proprietary work of MIYACHI UNITEK CORPORATION and may not be reproduced copied exhibited or otherwise used without the written authorization of MIYACHI UNITEK CORPORATION Printed in the United States of America Revision Record Revision Basis of Revision New Release Update to Miyachi Unitek logo and added new CAUTION information LIGHT FORCE WELD HEAD SERIES 50M 990 137 FOREWORD Thank you for purchasing a Miyachi UnitekTM Light Force Weld Head Series 50M Upon receipt of your equipment please thoroughly inspect it for shipping damage prior to its installation Should there be any damage please immediately contact the shipping company to file a claim and notify Miyachi Unitek Corporation at 1820 South Myrtle Avenue P O Box 5033 Monrovia CA 91017 7133 Telephone 626 303 5676 FAX 626 358 8048 e mail info unitekmiyachi com The purpose of this manual is to supply operating and maintenance personnel with the information needed to properly and safely operate and maintain the Light Force Weld Head We have made every effort to ensure that the information in this manual is accurate and adequate Should questions ar
11. Unitip to Unibond Electrode or Thermode Holder Conversion Reference figure B 1 Perform the following steps 1 Remove both flexures from the weld head by removing the two M4 socket head button cap screws lock washers and flat washers 2 Remove the four 4 40 socket head cap screws that hold the electrode holder to the xU 4 socket head Carefully remove the electrode holder ld head button ins cap screws by lowering it straight down Retain the screws Flexures 3 From the Adapter Kit obtain the Electrode Sleeve and Adapter Block Assembly and slip the sleeve over the shaft on the adapter block Figure B 1 Unitip to Unibond Electrode 4 Position the assembled sleeve and adapter block under the slide shaft and rotate the sleeve so that the split in the sleeve is toward the back of the weld head Attach the assembly to the weld head with the four 4 40 socket head cap screws removed in step 2 5 Slide the Unibond electrode holder Electrode Flexure Assembly or thermode holder Thermode Unitip Holder Assembly over the insulator Align both halves so that they are parallel to each other on a horizontal plane and lock them into position by tightening the socket cap screws on each side of the electrode holder Alternate the tightening process from side to side Verify that the electrode holder halves are not shorted together at the back of the holder and that they are still parallel 6 Connect both flexures to the weld hea
12. autions Some hybrid microwave component manufactures have experienced a transient voltage problem during welding which can damage Field Effect Transistors FETs This problem is caused by voltage leakage through the primary to secondary capacitance of the Welding Transformer in combination with a low package to ground capacitance Figure 2 6 shows the External Filter Network required to shunt the transient voltage through a very low impedance path to ground thus protecting the FET device Unitip electrode From Unibond Figure 2 6 External Filter for Elimination of Transient Voltage Problem LIGHT FORCE WELD HEAD SERIES 50M 990 137 2 5 CHAPTER 3 OPERATION Parallel Gap Welding Variables Electrode Materials Use RWMA 2 copper electrodes for resistive and or hard materials such as gold plated Kovar and nichrome Use molybdenum or tungsten electrodes for conductive or soft materials such as copper and gold Unibond Electrodes are available in both RWMA 2 copper and RWMA 14 molybdenum Unitip Electrodes are only available in molybdenum Testing has shown that Unitip Electrodes with a face size of 0 457 mm 0 018 inches wide by 0 508 mm 0 020 inches deep or larger can be used to weld gold plated kovar ribbon that is 0 051 mm 0 002 inches thick or less without experiencing electrode sticking to the gold plated kovar ribbon Testing has also shown that Unitip Electrodes UTM111C UTM111L UTM112C and UTM112L can not be used to weld g
13. d Side VW Light Force Weld Head Front View ee ee Unitip to Winbond Electrodos Unibond to Series SOMF Models CCESSOTIES RR Electrodes and 4 Maximum Unitip Operational Force Limits Conversion Kits LIGHT FORCE WELD HEAD SERIES 50M Page 1 2 1 3 2 2 2 2 3 2 3 2 4 2 5 3 2 4 1 A 2 A 3 B 2 B 3 Page 1 2 1 5 1 6 B 1 vii CHAPTER 1 DESCRIPTION Section Features The Unitek Peco Series 50 are precision low inertia heads designed for a wide variety of delicate parallel gap welding and reflow soldering applications True vertical electrode motion a Series 50 feature eliminates electrode wiping action at all welding levels and may increase electrode life Targeting the work piece is made easier with true vertical motion The 1 91 cm inch vertical stroke permits easy access into deep packages A low mass spring and compound lever force system ensures accurate repeatable welding force in the 0 39 1 23 to 9 807 N 40 125 to 1000 gram force gf range The mechanism is designed so that the work pieces and electrodes will not be subjected to forces in excess of the Preset Force Excessive welding force is a major cause of bond failure or inconsistent bonds and short electrode life The Series 50 Heads are available in four different electrode configurations Each configurati
14. d using the two M4 socket head button cap screws lock washers and flat washers in the Ship Kit LIGHT FORCE WELD HEAD SERIES 50M B 2 990 137 APPENDIX B ELECTRODE HOLDER CONVERSION Unibond to Unitip Conversion Reference figure B 2 Perform the following steps 1 Slide the set of Adapters into the slot in the Unibond holder The Adapters may be Adapter set slid in either from the top or ES lt bottom whichever is most Unibond holder j convenient 2 Slide the Unitip into the holder between the adapter set halves and secure them by tightening the socket head cap screws in the front of the holder Figure B 2 Unibond to Unitip Conversion Unitip Socket head cap screws LIGHT FORCE WELD HEAD SERIES 50M 990 137 B 3 E Accessories Table 1 5 Area of electrode face 3 1 C Caution Definition dl iv Cleaning electrodes as sean 4 2 Components Weld head 1 4 Connecting power supply 2 4 Conversion Kits Table B 1 Conversions Electrode holder susana B 2 Unibond to Unitip asas B 3 Unitip to Unibond Electrode B 2 D Definitions Chuti usen iv WANN iin iv Description of Series 50 Light Force Weld Head 1 1 Dressing electrodes diia 4 1 Duration of pulse ae 3 1 E Electrode clean asus 4 2 Electrode dress ascii 4 1 Electrode face dra 3 1 Electrode holder conversion
15. der halves when viewed from the front of the head 4 Verify that the upper end of the Unitip is seated against the top of the machined groove in the Electrode Holder Wiggle the left half of the Electrode Holder to ensure that it fits against the Unitip and then finger tighten the Electrode Clamping Screw Figure 2 1 HE50 CAUTION Do not over tighten the clamping screw Electrode Holder with Unitip Installed Unitip electrode faces can be severely damaged by applying excessive bonding forces Table 2 1 gives maximum operational force limits in kilograms of force See Chapter 4 for Unitip cleaning and dressing instructions LIGHT FORCE WELD HEAD SERIES 50M 990 137 2 1 CHAPTER 2 GETTING STARTED Table 2 1 Maximum Unitip Operational Force Limits UNITIP P N MAX FORCE kgf Unibond Electrode Installation Model 50 1 Check the voltage sensor cable located on the underside of y Sensing cable the HESOUB Electrode gap i Electrode Holder adjustment knob b Verify that the two Bar Electrode mount alignment screw slotted head screws attaching the voltage sensing cable to the flexure assemblies QA Sensing cable screws shown in figure 2 2 tightened Erratic operation results if they are loose one each side Figure 2 2 HE50UB Electrode Holder Bottom View NOTE The Unitek Peco closed loop power supplies are the only controls that uses re
16. e ae 3 1 Electrode holder secos 1 3 Electrode face area 3 1 Electrode holders Installation 2 2 Electrode materials as 3 1 Electrodes installation 2 2 Force Welding eese tiroirs 3 1 Conversion holder to RNAs 3 1 Unibond electrode or thermode B 2 Pulse CUT AHO nk 3 1 User maintenance Welding TOTS us rtr mx iis 3 1 Electrode Planning for installation 2 1 Cleaning as 4 2 Power supply connections 2 4 Dressing idco te iol 4 Precautions with microwave circuitry 2 5 Precautions ee 4 1 Precautions User maintenance 4 5 nn 4 1 Procedures User maintenance 4 1 Pulse duration tix paleis sad 3 1 W R Warning Definition af ner iv Weld head major components 1 4 Record of revisions a ii 3 1 Repair Seren 5 1 Welding Parallel gap variables REVISION TOC neue ii See parallel gap welding S iv Specifications ee 1 a Tables N see 1 5 Conversion Kris B 1 ee 1 6 SOME Models case 1 2 Thermode holders css 1 5 U Unibond Converting electrode for Unitip B 2 Electrode holder nase 1 3 U continued Electrode holders installation 2 2 Electrodes installation 2 2 Unitip LIGHT FORCE WELD HEAD SERIES 50M INDEX 2 990 137
17. incorrectly dressed Bring the electrode face into contact with the polishing disk Avoid applying a force of more than 150 grams to smallest Unitip electrode tips CORRECT INCORRECT Figure 4 1 Unitip Dressing Procedure Gently pull the polishing disk forward keeping the direction of pull parallel to the electrode gap LIGHT FORCE WELD HEAD SERIES 50M 990 137 4 1 CHAPTER 4 USER MAINTENANCE NOTE Do not rock the polishing disk from side to side or front to back Clean the electrode face with a small lint free swab saturated in alcohol to remove any residue created by the dressing procedure Low pressure compressed air can also be used to remove any residues Examine the electrode face with a small mirror for flatness and direction of surface scratches A properly dressed electrode will have small scratch marks that are parallel to the electrode gap Unitip and Unibond Electrode Cleaning Depending on use periodically resurface Unitip and Unibond electrodes using the techniques described above to remove oxides and welding debris from the electrodes These oxides are a natural result of the bonding process When welding with Unitip electrodes a small puff of smoke appears as each bond is made The absence of this puff of smoke is a clear signal to the operator that it is time to clean the electrode face Use organic solvents to clean flux and other buildup from Thermode tips LIGHT FORCE WELD HEAD SERIES 50M 4 2 990 137 CHA
18. ise or if you have suggestions for improvement of this manual please contact us at the above location numbers Miyachi Unitek Corporation is not responsible for any loss due to improper use of this product LIGHT FORCE WELD HEAD SERIES 50M 990 137 SAFETY NOTES This instruction manual describes how to operate maintain and service the Light Force Weld Head Series 50M and provides instructions relating to its SAFE use Procedures described in this manual MUST be performed as detailed by QUALIFIED and TRAINED personnel For SAFETY and to effectively take advantage of the full capabilities of the tester please read these instruction manuals before attempting to use the workstation Procedures other than those described in this manual or not performed as prescribed in it may expose personnel to electrical hazards After reading this manual retain it for future reference when any questions arise regarding the proper and SAFE operation of the tester Please note the following conventions used in this manual WARNING Comments marked this way warn the reader of actions which if not followed might result in immediate death or serious injury CAUTION Comments marked this way warn the reader of actions which if not followed might result in either damage to the equipment or injury to the individual if subject to long term exposure to the indicated hazard LIGHT FORCE WELD HEAD SERIES 50M iv 990 137 CONTENTS Revision RCC nee
19. ld Head Series 50M Table 1 3 lists the electrodes that are available Table 1 2 Accessories MODEL DESCRIPTION SMZ 660 Nikon Stereo Zoom 0 5X objective lens 10X eyepieces 195mm max working distance DFS Dual Firing Switch Junction Box Connects two firing switch cables from two different heads to a single power source DHD Device Holder for 0 3 to 0 8 to 1 5 cm 0 6 inch wide Sidebraze Packages and 0 64 cm 0 250 inch wide Cerdip Plastic Packages with lengths up to 5 258 cm 2 070 inch Has a spring loaded base DHF Device Holder for Flat Substrates or Packages that are 5 258 cm to 5 08 0 250 to 2 inches square Has a spring loaded base DHL Device Holder for Lead Frames that have 8 to 40 leads and are up to 10 inches long 50 Replacement Unitip Electrode Holder Converts Series 500 50 501 to accept Unitip Electrodes Power straps included HES50UB Replacement Unibond Electrode Holder Converts Series 50 SORF SOLRF to accept Unibond Electrodes Power straps included UTA Adapts HESOUB Unibond electrode holders for use with Unitip electrodes PD Polishing Disks Package of 50 Not recommended for Unitips CPD Ceramic Polishing Disks for Unitip electrodes Package of 20 WP Work Positioner 7 6 cm 3 inch diameter Height adjustable from 3 65 to 5 08 cm 1 7 16 to 2 inches LIGHT FORCE WELD HEAD SERIES 50M 990 137 1 5 CHAPTER 1
20. mote voltage sensing 2 Loosen the Electrode Holder Clamp Screws Set the Electrode Gap Adjustment Knob for maximum gap width and insert the Unibond Electrodes into the holders as shown in figure 2 3 3 Loosely hold the tips or electrodes in place and rotate the Electrode Gap Adjustment Knob to its fully clockwise closed position LIGHT FORCE WELD HEAD SERIES 50M 2 2 990 137 CHAPTER 2 GETTING STARTED 4 Orient the electrodes so they contact each other along their entire length and are perpendicular to the working surface Position the electrodes vertically in the holder so the tip ends coincide 5 Tighten the Electrode Holder Clamp Screws CAUTION Do not over torque the Clamp Screws Unibond Doing so will deform the Flexure dramatically electrodes reducing its life Figure 2 3 HE50UB Electrode with 6 Open the electrodes to the desired operating gap by EU1000 Unibond Electrodes turning the Electrode Gap Adjustment Knob counterclockwise NOTE The operating gap can be safely opened to a maximum of 1 0 mm 0 040 inches Section Ill Optic Pod Microscope Installation Set screw Place the Optic Pod figure 2 4 into the Re Optic Mounting Post and secure it with the gt Mounting Set Screw Assemble the Optic gt Pod in accordance with instructions that came with the Assembly Optic mounting post Figure 2 4 Installation of the Optic Assembly LIGHT FORCE WELD HEAD SERIES 50M 990 137 2 3 CHAPTER 2
21. ode essa 4 2 CHAPTER 5 REPAIR SERVICE uud nn 5 1 Service Repair t Plan das 5 1 APPENDIX A TECHNICAL SPECIFICATIONS 1 W ld h ad DIMENSIONS neutrale A 2 APPENDIX ELECTRODE THERMODE HOLDER CONVERSIONS B 1 Unitip to Unibond Electrode or Thermode Holder Conversion sss B 2 Unibond to Unitip Loire dt eek B 3 A Q Index 1 LIGHT FORCE WELD HEAD SERIES 50M vi 990 137 Figure 1 1 1 2 1 3 1 4 Dal 2 2 a3 2 4 2 5 2 6 3 1 4 1 990 137 ILLUSTRATIONS Title Model 50MF Light Force Weld Head Close up of the Model HE50 Unitip Electrode Holder with Model UTM 112C Unitip Electrode ae Close up of the Model HESOUB Unibond Electrode Holder with Unibond Electrodos ues ipse 50M Series Weld Head Components ra HE50 Unitip Electrode Holder with Unitip installed HESOUB Electrode Holder Bottom VleW occcnnonocononoconononanananonocicnoncnannanonacos 500 Electrode with EU1000 Unibond Electrodes Installation of the Optic Assembly unse Welding Cable Transformer Power Connections External Filter for Elimination of Transient Voltage Problems Actual Force Versus Force Unitip Dressing Proc esse Light Force Weld Hea
22. old plated kovar ribbon because these tips sizes experience severe electrode sticking regardless of weld energy settings or gold plated kovar ribbon thickness See Chapter 1 Section IV for a complete listing of Unibond and Unitip electrodes Area of Electrode Face For a given Welding Force a large electrode face puts less pressure on the workpieces and produces a larger welding area A larger electrode face also requires more energy provided the contact resistance between the electrode face and work piece does not change drastically Insufficient pressure on the workpieces is likely to cause spitting of the work piece material or electrode sticking When welding conductive materials use electrodes with the smallest face possible Gap The larger the distance between the electrodes the greater the energy required to make a given weld Unitip Electrodes come in a variety of fixed gap sizes ranging from 0 0025 to 0 018 cm 0 001 to 0 007 inch with 0 0025 0 0050 and 0 0102 cm 0 001 0 002 and 0 004 inches being the most popular gap sizes As a starting point select a gap size that approximately matches the thickness of the work piece material Welding Force Increasing the Welding Force lowers the contact resistance between the workpieces and between the workpieces and the electrodes requiring more energy to make a given weld Pulse Duration The longer the Pulse Duration the greater the penetration of the weld into both top and b
23. on can be foot pedal or air actuated The Baseplate and Optic Mounting Assembly provide a stable work place and impose little restriction on the size of the work piece Machined mounting surfaces on the left hand side and top of the Head allow them to be easily incorporated into a custom machine or work station A selection of electrodes and thermodes allows welding or reflow soldering on devices such as semiconductor thick film ceramic substrates or printed circuit boards See Appendix B for complete information on electrode thermode conversions The Welding Force is set by turning the knob located on the front of the weld head A Force Curve located on the right hand side of the cover converts the digital counter readings to gf Calibration is set at the factory and does not change with time All Series 50 Heads are supplied with a Baseplate Optic Mounting Assembly Model CP Cable Pedal Voltage Sensing Thermocouple Sensing Cable and 2 AWG Welding cables Optional Work Holders and Optic Accessories are available LIGHT FORCE WELD HEAD SERIES 50M 990 137 1 1 CHAPTER 1 DESCRIPTION Section Il Model Descriptions Foot Actuated Series 50M Heads Foot actuation allows the operator to control the rate of electrode descent Targeting of micro or sub miniature work pieces is generally easier using foot actuation Four different electrode configurations each designed for different welding or reflow soldering applications comprise the
24. ottom workpieces and the greater the effect of the heat upon the metallurgical structure of the workpieces In general use pulse durations less than 15 ms for welding and durations greater than 20 ms for brazing or reflow soldering To maximize electrode life use Unibond Electrodes for brazing Pulse Duration is critical when welding conductive materials such as copper and gold and should be kept to a minimum LIGHT FORCE WELD HEAD SERIES 50M 990 137 3 1 CHAPTER 3 OPERATION Procedure Use the force curve label displayed on the side ofthe weld head as shown in figure 3 1 to set the welding force The vertical axis represents the actual welding force The horizontal axis represents the corresponding force setting required to produce the actual force Use the appropriate curve as follows Top curve SOMFUB Bottom curve 50MF Refer to the Instruction Manual which accompanies Power Supply or Time At Temperature Controller to supplement these instructions mm LIGHT FORCE GWUNITEKPECO wein HEAD 1000 800 700 600 FORCE 500 GRAMS 300 200 180 140 100 80 60 40 0 20 40 60 80 100 120 140 160 200 300 400 500 600 700 FORCE INDICATION Figure 3 1 Actual Force Versus Force Setting LIGHT FORCE WELD HEAD SERIES 50M 3 2 990 137 CHAPTER 4 USER MAINTENANCE Section I Precautions WARNING Do not remove the spring housing cover for any reason This cover protects the user should the force spring break during o
25. peration The force spring does not require maintenance nor is it accessed during calibration CAUTION All bearing surfaces are designed for non lubricated operation Do not oil any bearings Guide bearings are factory pre loaded and therefore do not require adjustment All vertical motion bearings are installed at the factory and are sealed with a locking compound Ifthe seal is broken the warranty on the bearings will be void Section Il Maintenance Procedures Unitek Peco Heads are designed to minimize routine maintenance Daily maintenance should be limited to electrode dressing and cleaning Unitip and Unibond Electrode Dressing New Unitip and Unibond electrodes must be dressed to ensure that the electrode face is parallel to the work piece surface The small Unitip and Unibond tip geometry makes the electrode face extremely susceptible to damage during dressing or cleaning Dress Unibond electrodes with a Model PD Polishing Disk which is made from 600 grit emery paper Dress Unitip electrodes with a Model CPD Ceramic Polishing Disk Do not use the PD 600 grit on Unitip NOTE Thermodes do not require dressing Install Unitip or Unibond electrode Adjust the Work Holder surface height so that it is at the same level as the work piece surface Place a Model CPD polishing disk or CPD ceramic polishing disk on the Work Holder surface directly beneath the electrode face Figure 4 1 shows a Unitip electrode being correctly and
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