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Spring back alloy for diamond_color stone setting.pptx

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Spring back alloy for diamond_color stone setting.pptx

  1. 1. || Confidential || CITE Department Page 1 Spring back Alloy and process development for stone setting for effective clamping and productive method. Cross Functional Team Principal investigator: Lakshmidar Biswal Project Leader: Dhandapani P (CITE) Team member: 1. Kamalakannan(Down stream process leader- User) 2. (Process- Down stream) 3. Anjana S (QA) 4. Karthikeyan (NPD)
  2. 2. || Confidential || CITE Department Page 2 1. Customer Requirements and Planning solution 1 - Requirement provided with development of Spring back Alloy and process development for stone setting for effective clamping and productive method. Phase1: Planning and Literature Phase 2: Process Design and prototype development Phase 3:Process validation and implementation Phase 4: Feedback, assessment and corrective action Planning Sep week 4 Nov week 3 Oct December week1 User hand overing December Principle method - Alloy and heat treatment cycle design for homogenization for improvising ductility before diamond setting with reduced spring back following that aging to improve hardness and durability
  3. 3. Process 1_ Reduced spring back and increased resilience property || Confidential || CITE Department Page 3 As cast sample Homogenization Heat treatment cycle for Au-Cu-Ag/Zn Alloy system Diamond setting with less efforts and lower spring back Artificial aging to improve strength and resilience for stone securing in use with improved scratch resistance and wear life Cycle to be decided based on phase diagram and diffusion kinematic study Aging temperature and cycle based on alloy type
  4. 4. Principle method 1 by optimization of Heat treatment process and Alloy type || Confidential || CITE Department Page 4
  5. 5. || Confidential || CITE Department Page 5 1. Customer Requirements and Planning solution 2 Phase1: Planning and Literature Phase 2: Process Design and prototype development Phase 3:Process validation and implementation Phase 4: Feedback, assessment and corrective action Planning Sep week 4 Nov week 3 December week1 User hand overing Jan 2022 - Requirement provided with development of Spring back Alloy and process development for stone setting for effective clamping and productive method. Principle method - Based on gaining shape memory alloy property to stone setting process Sep week 4 Oct week 3 Nov week3 December
  6. 6. Process 2_ Based on shape memory gold alloy design and process method || Confidential || CITE Department Page 6 As cast sample with alloy design for 14Kt and 18Kt Ordering micro structure check Dry ice martensite transformation Diamond setting Heat treatment requirement check Flame heating to spring back
  7. 7. 2.Literature: Why rhodium plating? || Confidential || CITE Department Page 7  Wear and abrasion resistance: Electroplated rhodium features a hardness ranging 800 on the Vickers hardness scale. Because of this extreme hardness, rhodium offers excellent protection against premature wear and can prevent the occurrence of incidental abrasions that can detract from the substrate’s appearance.  Enhanced durability: A rhodium coating will ensure the longest possible part lifespan, even in the most challenging environments.  Chemically inert: This metal is a chemically inert material, meaning it will not react adversely with other metals or chemicals during electroplating.  Aesthetic appeal: One of the most significant benefits of plating with precious metals is their ability to enhance the appearance of the substrate. The coating is also highly reflective, which adds to the brightness and shine of the workpiece.
  8. 8. 2. Literature : Wear life in Rh plating types || Confidential || CITE Department Page 8 • RHODIUM-RUTHENIUM alloy plating is having higher abrasion Resistance than pure Rh platting • Cost of Rh-Ru (70:30) is lower (30%) than pure rhodium • Slighter Color difference are there between pure Rh and Rh-Ru alloy Ref: Awaiting similar test report for Rh-Pt in blue colour from Umicore(Njwellery techniq)
  9. 9. || Confidential || CITE Department Page 9 Coating Type From solution Chemical Electrochemical Solgel (Nano ceramic) From gas phase (e.g PVD, CVD) Liquid/semi liquid (e.g Thermal spray) Electro chemical method coating Organic base (E coat) Blue color bath type Pink color bath type Inorganic base (Metallic plating) Rh blue color plating bath type Rh blue color pen plating 2.Literature: Coating Type selection and principle
  10. 10. 3. competitive analysis - Benchmarking 1 _Katherine Jetter || Confidential || CITE Department Page 10 Blue Rhodium platted on 14K gold Hot Pink Sapphire and Seed Pearl Hoops with Enamel https://katherinejetter.com/products/pink-sapphire-and-seed-pearl-hoops-with- enamel Ref: https://katherinejetter.com/collections/new-collection/products/copy-of-diamond- mini-huggie-hoops-with-pink-rhodium-plating
  11. 11. 3 .Competitive analysis- Benchmarking 2_ Diamondere || Confidential || CITE Department Page 11 • Brand: Diamondere • Country: USA • Coating type: gallium or indium plated to make it bright blue and scratch- resistant. • Metal: 14K yellow gold
  12. 12. || Confidential || CITE Department Page 12 E coat Suppliers Euro tecniche Quote received Legor Quote received Doitimpex Navbharath 4.Coating and Supplier selection Rh platting Suppliers for bath Only Blue color Euro tecniche Quote recived Legor Quote awaited TWL / SRA Team NA in india Navbharath Rh platting Suppliers for Pen (Blue) Euro tecniche Legor Rs 7800 Rs 10000 Rs 106000 Rs 120000 Rs 4500 Solgel (Nano ceramic) Euro tecniche Rio grande
  13. 13. 5. FMEA (Failure mode effects analysis) || Confidential || CITE Department Page 13 Si no Process/product requirements Potential failure mode Potential effect of failure Class /Sev Potential cause Recommended action 1 Brightness, reflection and shine in final platted gold ring Base metal having higher roughness, not polished 100%. Surface finish not acceptable after plating High/ 8 Inspection and qualification criteria not available before plating. Missed polishing. Inspection and acceptance criteria as roughness of polished surface should be less than or equal to 0.1 micron level 2 Brightness, reflection and shine in final platted gold ring Porosity defects on surface Surface finish not acceptable after plating High/ 8 Inspection and qualification criteria not available before plating Zero Porosity level to be verified for the platting samples. 3 No surface discoloration Color change due to reaction Tarnishing/corrosio n Mod erate /6 Reaction with sweat or environment chemicals To be validated in artificial sweat test / humidity chamber 4 Surface discoloration Color shade Change from intended color and brightness Mod erate /6 Continuous exposure to sun light To be validated in UV chamber
  14. 14. 5. FMEA (Failure mode effects analysis) contin., || Confidential || CITE Department Page 14 Si no Process/product requirements Potential failure mode Potential effect of failure Class/Sev Potential cause Recommended action 5 Adhesiveness of coating Peel off Non uniform base metal color visibility(Yellow- Blue), surface layer discontionus Moderat e/6 Substrate surface with impurities (oil, grease, volatile matter) - Establishing degreasing and ultrasonic cleaning process as per plating requirement - Adhesion test DVP to validate chemistry of rhodium solution 6 Abrasion / wear life of coating Coating removal Surface coating removal and aesthetic change in look High/8 Daily use, abrasion between object in contact and skin - Abrasion test to validate relative life of new colour coating in comparison with white rhodium - Need to make guideline for the product as a user instruction - Guideline for converting to yellow gold once coating started to remove 7 Uniform coating/color Improper coating/color Early coating failure High/8 Improper process parameter/chemical DOE to validate and update SOP with validated process parameters 8 In put material availability Non availability of raw material Process / production stop High/8 Color rhodium not available in india -Developing two suppliers and trying to develop E coat as alternate in validation
  15. 15. 6. Process flow diagram for Rhodium platting- SOP guideline || Confidential || CITE Department Page 15 Polishing of platting sample Inspection -Surface finish -Equipment/chemical condition Equipment calibration, PPEs , Chemical requirements Recording checklist Ok /Not ok Send Quality alert Ultrasonic cleaning (2 mins ) Cleaning solution – Detergent solution with 20ml/l, 60 °C Normal rinse (5 to 10 sec) Rinse in demineralized water (5 to 10 sec) A Ok Not Ok
  16. 16. 6. Process flow diagram for Rhodium platting- - SOP guideline || Confidential || CITE Department Page 16 A Electrolytic degreasing (1 min) Solution- Degreasing powder 100g/l 6 to 10 V, 50 °C Anode-stainless steel Normal rinse (5-10 sec) Rinse in demineralized water (5 to 10 sec) Activation (10 sec) Visually inspect ok /Not ok Not Ok Ok 5% sulphuric Acid B B Rhodium plating 2-3 Min 2-2.2V, 40 °C Anode-Pt platted Ti Solution- 2g Rh/200ml + 800ml DM water Visually inspect ok /Not ok Not Ok Ok Normal rinse (5-10 sec) Rinse in demineralized water (5 to 10 sec) Dry with hot air inspect ok /Not ok Send Quality alert Despatch Ok Not Ok
  17. 17. 7. Process flow diagram for E coat- SOP guideline || Confidential || CITE Department Page 17 Polishing of platting sample Inspection -Surface finish -Equipment/chemical condition Equipment calibration, PPEs , Chemical requirements Recording checklist Ok /Not ok Send Quality alert Ultrasonic cleaning (2 mins ) Detergent solution with 20ml/l, 60 °C Normal rinse (5 to 10 sec) Rinse in demineralized water (5 to 10 sec) A Ok Not Ok A Electrolytic degreasing (1 min) Solution- Degreasing powder 100g/l 6 to 10 V, 50 °C Anode-stainless steel Normal rinse (5-10 sec) Rinse in demineralized water (5 to 10 sec) Activation (10 sec) inspect ok /Not ok Not Ok Ok 5% sulphuric Acid B
  18. 18. 7. Process flow diagram for E coat- SOP guideline || Confidential || CITE Department Page 18 B Bath platting- 25 Sec 25V, 30 °C Anode-stainless steel inspect ok /Not ok Not Ok Ok Double rinse (10 sec) Dry with hot air Dry in fan oven inspect ok /Not ok Send Quality alert Despatch Ok Not Ok 125 °C, 40 mins 0 5 10 15 20 25 30 0 5 10 15 20 25 30 35 Time Volt Time vs Volt chart
  19. 19. 8.Design of experiment for parameter finalization _ Rhodium plating || Confidential || CITE Department Page 19 Sample no/ID Voltage (V) Time (mins) Temperature (Degree Celsius) Colour Coating inspection remarks 1 2.2 1 40 2 2.2 2 40 3 2.2 3 40 4 2 2 40 5 2 3 40 Samples planned to collect as finish product in quality return stage with reasons which is not going to affect coating development- (e.g Weight change, Stone Wallen) Parameter will be fixed Based on initial coating evaluation
  20. 20. 9.Design of experiment for parameter finalization _E coat || Confidential || CITE Department Page 20 Sample no/ID Voltage (V) cycle Time (Sec) Temperature (Degree Celsius) Colour Coating inspection remarks 1 5 sec for 0V, 13 sec for 0 to 25 V , hold 12 sec 25 30 Blue 2 0 to 28V in 13 sec, 12 sec in 28 V 25 30 Blue 3 0 to 30 V in 13 sec, 12 sec in 30 V 25 30 Blue 4 25 30 Pink 5 28 30 Pink 6 30 30 Pink Samples planned to collect as finish product in quality return stage with reasons which is not going to affect coating development- (e.g Weight change, Stone Wallen) Parameter will be fixed Based on initial coating evaluation
  21. 21. 10.DVP plan for Rhodium platting || Confidential || CITE Department Page 21 Testing Specification Reference Test standard Testing location No of sample required and size Test category Target date Artificial sweat 24 hr ISO3160/NFS80772 QA lab Any size, 1 no Must 17th Sep Humidity test 24 hr ISO 9022 QA lab Any size, 1 no Optional 15th Sep UV Test 24 Hr ASTM D4587 QA lab Any size, 1 no Must 15th Sep Ultrasonic test 2 min, 60 deg Working condition In CITE lab Any size, 1 no Must 15th Sep Adhesive tap test 2.9 to 3.1 N ISO 4524-5 QA lab Any size, 1 no Must 15th Sep Adhesive bend test 90 deg angle ISO 4524-5 Process 10mmx25mm, 1 no Optional 25th Sep Abrasion test Comparative with white Rh ASTM D4060/ ASTM F1978 QA lab 10mmx25mm, 1 no Must 20th Sep Relative Reflectivity Comparative with white Rh ASTM E1331 CITE lab Any size, 1 no Optional 15th Sep Coating thickness measurement (XRF/SEM) 0.2 micron ASTM B568 Need to identify Any size, 1 no Optional TBD CIELAB color space Observation ASTM E1347 & ASTM D2244 QA lab Any size, 1 no Optional 15th Sep
  22. 22. 11.DVP plan for Ecoat || Confidential || CITE Department Page 22 Testing Specification Reference Test standard Testing location No of sample required and size Test category Target date Artificial sweat 24 hr ISO3160/NFS80772 QA lab Any size, 1 no Must 19th Sep Humidity test 24 hr ISO 9022 QA lab Any size, 1 no Optional 17th Sep UV Test 24 Hr ASTM D4587 QA lab Any size, 1 no Must 17th Sep Ultrasonic test 2 min, 60 deg Working condition In CITE lab Any size, 1 no Must 17th Sep Adhesive tap test 2.9 to 3.1 N ISO 4524-5 QA lab Any size, 1 no Must 17th Sep Adhesive bend test 90 deg angle ISO 4524-5 Process 10mmx25mm, 1 no Optional 27th Sep Abrasion test Comparative with white Rh ASTM D4060/ ASTM F1978 QA lab 10mmx25mm, 1 no Must 22th Sep Relative Reflectivity Comparative with white Rh ASTM E1331 CITE lab Any size, 1 no Optional 17th Sep Coating thickness measurement (XRF/SEM) 0.5 to 3 micro ASTM B568 Need to identify Any size, 1 no Optional TBD CIELAB color space Observation ASTM E1347 & ASTM D2244 QA lab Any size, 1 no Must 17th Sep
  23. 23. 12Solgel Ceramic coating || Confidential || CITE Department Page 23 1. Eurotechniche https://drive.google.com/file/d/11QfWuV5v GjWL9gQ0OSDpu5WK6t_X8c4c/view 2. Riogrande https://www.riogrande.com/product/LuxArt CoatingCartridgesLucidRose5g/204864?code =204864 • This LuxArt® Lucid- With 35% ceramic content and organic matrix, creative designs with opaque surfaces. • Use LuxArt® to create high-polish of enamel and the durability of ceramic—without plating equipment or high-temperature kilns. • The finished surface has a hardness of 210 N / mm² and is hypoallergenic and bio-compatible

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