PERFECT SURFACES WORLDWIDE

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2 A WELCOME FROM THE TECHNOLOGY LEADER in mass finishing Proverbial ingenuity, coupled with German efficiency and a love of perfection, are the best qualifications for developing successful ways of creating immaculate surfaces. Driven by these attributes of German engineering, OTEC, with its innovative technologies, has grown into the industry trendsetter in just a few years. 3

3 MARKETS AUTOMOTIVE INDUSTRY TOOLMAKING INDUSTRY STAMPED, TURNED AND MILLED PARTS AEROSPACE INDUSTRY MEDICAL AND PHARMACEUTICAL INDUSTRY CERAMIC AND PLASTIC PARTS JEWELLERY AND WATCHMAKING INDUSTRY 5

4 JEWELLERY AND WATCHMAKING INDUSTRY 6

5 JEWELLERY AND WATCHMAKING INDUSTRY Surfaces like hand-polished Surface quality for the highest requirements OTEC has a lot of experience with filigree functional parts Highest surface quality Process reliability Sophisticated technology Best process know-how Special feature of the OTEC process Combination of process and machine technology enables hand polishing quality Machining of stainless steel, platinum, gold, silver or ceramics 7

6 JEWELLERY AND WATCHMAKING INDUSTRY Traditional process Conventional manual process Time- and cost-intensive Traditionally, after casting the sprue and the casting skin is removed and prepared with a file and sandpaper or hand grinding device Then machine operations follow, such as shining, vibratory finishing and prepolishing Afterwards, each individual piece of jewellery is polished by hand to a high gloss finish and galvanized if necessary 8

7 JEWELLERY AND WATCHMAKING INDUSTRY The OTEC process Development and production of special grinding and polishing machines Sophisticated process engineering tailored to the entire production process Worldwide market leader in surface finishing for jewellery production Reduction of manufacturing costs for surface treatment Up to 60 percent of the jewellery produced can be polished by machine, ready for sale, without tedious and time-consuming post-processing by hand! OTEC solutions: ECO-Maxi for a few workpieces CF for bulk goods made of all kinds of precious metals DF for up to 400 heavy rings per hour 9

8 JEWELLERY AND WATCHMAKING INDUSTRY Advantages with OTEC Highest technical innovations of disc finishing machines several gap systems available Highest quality of machine components Longest life for systems Highest stability of the processes Highest know-how in processing and process development Simple operation and easy handling A wide range of high quality media Reliable all-round service by trained specialists - support beyond purchase 10

9 HOW CAN WE ACHIEVE A SMOOTH SURFACE? Chemical and mechanical polishing Chemical polishing This is a way of removing metal from the surface of the jewellery by chemical reaction. Used mainly for areas that are difficult to access, as this method makes it very difficult to achieve perfect shiny surfaces Mechanical polishing: Most effective procedure with best results Surfaces of the highest quality and gloss OTEC-process 11

10 MASS FINISHING for jewellery and watchmaking industry DISC FINISHING MACHINES ELECTROPOLISHING MACHINES DRAG FINISHING MACHINES 12

11 DISC FINISHING MACHINES 13

12 DISC FINISHING MACHINES OTEC CF Standard Innovative technology from the world market leader Suitable for wet/dry machining Process container with hot cast inner polyurethane lining Modular expandable from 1 to 6 process containers Capacity: up to 2 kg per process container Bench type machine with aluminum profile frame Speed control via frequency converter Siemens PLC touch screen control Digital display of all relevant processing parameters Memory for up to 200 programs 14

13 DISC FINISHING MACHINES Series CF-T (Bench type machine) Especially suitable for the dry processing of jewellery Bench type machine with aluminium profile frame with optional one or two process containers for grinding or polishing of jewellery Ceramic-gap system Process container with hot cast inner polyurethane lining Touch-screen-operated with digital display of process time, speed, errors, compound and other important process parameters. Capacity: up to 2 kg each process container Advantages: Perfect high gloss polish Economical Inexpensive 15

14 DISC FINISHING MACHINES Influencing factors: A perfectly polished surface depends on the combination of these influencing factors: Type of disc finishing machine Output quality of the workpieces Kind of processing steps and sequence Type of processing media Process parameters such as speed, time etc. Carat rating of workpieces Workpiece geometry 16

15 DISC FINISHING MACHINES Type of disc finishing machine All the disc finishing machines have different container designs, gap designs and some adjustable parameters. Mostly this parameters makes the difference between good and perfect. Container Design Gap Systems Slowly end function Dosing unit or dosing pump difference 17

16 DISC FINISHING MACHINES Media There are many different media to use for grinding and polishing processes of gold & silver jewellery. Choosing the correct media is also one of the most important factors for a good result! Types of different media for jewellery finishing Plastic grinding chips Compounds Walnut shell granulates Wooden cubes and plastic polishing bodies Polishing and grinding pastes Adhesive oil 18

17 DISC FINISHING MACHINES Output quality of the workpieces Cast jewellery should be prepared beforehand for optimum machining results OTEC process delivers constant results therefore, the initial quality of the workpieces must all be the same. Advantages of the preparation Same output qualities Reduced process times Edges remain sharper due to the reduced process time 19

18 DISC FINISHING MACHINES Preparation process step by step Casting tree Cutting the sprue Magnetic polishing OTEC-process Sandpaper Removal of the sprue 20

19 DISC FINISHING MACHINES Process parameters Process time is the most important parameter for a good result. Too short grinding time results in high surface roughness and leaves the sandpaper lines on the surface. Too long process time will damage the jewellery by rounding the edges, cutting the prongs or removing the surface decoration on some parts Even if it does not harm the design, you lose more metal than necessary. 21

20 DISC FINISHING MACHINES Process parameters Speed while processing At too slow or too fast a speed, the workpieces can damage each other during the process. 22

21 DISC FINISHING MACHINES Process parameters Compound ratio Compound percentage is important because compound removes the waste of gold/silver and grinding media particles from the container and keeps the jewellery clean. It also provides a buffer effect between the chips and jewellery. 10 l water/compound flow per hour 10 l water/hour flow WITHOUT compound 23

22 DISC FINISHING MACHINES Process parameters Continuous water flow Removes the waste from the process container during the process Continuous water flow removes the abrasive particles and avoid that they are pressed into the surface. This very important for a following plating process 1 l water/compound flow per hour 10 l water/compound flow per hour 24

23 DISC FINISHING MACHINES Type of process + Wet grinding + + Dry grinding Dry polishing 25

24 DISC FINISHING MACHINES Wet process - grinding and smoothing/polishing Plastic chips gap 0,4 mm No hardening of the surface Very fine grinding possible No damaging of cubic zirconia Perfect for soft metals like gold and silver Helps to remove the waste from process container Gives a buffer effect for gentle processing Keeps precious stones safe 26

25 DISC FINISHING MACHINES Dry process grinding and polishing Walnut shell granules gap 0,05 mm Best polishing results Easy to handle Has 7 sizes for different purposes Can be used for polishing and for grinding Addition of grinding and polishing paste to dry media Gives the ability to grind or polish to media 27

26 ELECTROPOLISHING MACHINES 28

27 ELECTROPOLISHING MACHINES Advantage EPAG FLEX MODULAR Perfect for gold Short process times (20-30 minutes) Especially for filigree jewellery Easy handling Reduces manual work to a minimum Recovery of the gold losses by the electropolishing process by means of simple filtration, as well as deposition on the cathodes Simple and convenient extension to up to three process containers Completely cyanide-free process Work piece-specific program management system Processing of up to 40 work pieces per process container USB port for easy software updates and upgrades Filter unit for holding particles Video 29

28 DRAG FINISHING MACHINES 30

29 DRAG FINISHING MACHINES Series DF Drag finishing machines for high gloss polishing of heavy parts Capacity: up to 400 rings Advantages: Mirror shine on rings, bracelets, watch cases etc. Economical Low-cost method Video 31

30 EXAMPLES OF APPLICATIONS JEWELLERY AND WATCHMAKING INDUSTRY 32

31 EXAMPLES OF APPLICATIONS Overview - Which jewellery is suitable for processing? Ring Earring Pendants Broaches Mini Sets Stamping Bracelets Tube Earrings Tube Bracelets Hollow Chain Laser Cut Electroform Electrofusion 33

32 DISC FINISHING MACHINES For smaller jewellery parts (less than10 g) Earrings, hollow chains, electroforming jewellery or pendants can be processed in less than one hour process time in the disc finishing machine. mirror polish Main applications: Removal of the casting skin Removal of emery marks Surface refinement up to hand polishing quality 34

33 DISC FINISHING MACHINES For stamped and pressed parts Stamped parts and pressings with a wall thickness of only mm Initial quality for polishing is usually good CF machines are ideally suited for processing of this jewellery Flow-optimised process container shape enables particularly gentle processing Thin-walled workpieces will not be damaged Different machining for flat stamped parts, pressings and hollow parts (pressings with slots or holes, e. g. hollow chains, chain links) 35

34 DISC FINISHING MACHINES For functional parts of mechanical watches Only one processing stage for deburring, edge rounding, grinding and high gloss polishing Individually coordinated multi-stage process for perfect results 36

35 DISC FINISHING MACHINES Processing of corals and amber Natural products (Corals, amber etc.) By using special media and speed-optimized processes, even delicate and fragile workpieces are gently brought to a high gloss 37

36 DISC FINISHING MACHINES Processing of buckles and straps Grinding, smoothing and high gloss polishing Optimum results independent of the material 38

37 DRAG FINISHING MACHINES For larger jewellery parts (more than10 g) and watch housings Heavy workpieces, e. g. heavy jewellery or watch housings, are fixed in drag finishing machines with appropriate holders 39

38 ELECTROPOLISHING MACHINES Processing of filigree jewellery parts Grinding and polishing in the shortest possible time without damaging filigree details Very good machining of internal contours Polishing without rounding of the prongs and preparation of castings Perfect surfaces down to the smallest gaps Newly developed electro-polishing system works brilliantly in previously unattainable areas Polishing of extremely detailed and complex workpieces is possible without problems Without the use of hazardous chemicals Jewellery before (left) and after (right) the OTEC treatment 40

39 MEDIA JEWELLERY AND WATCHMAKING INDUSTRY 41

40 MEDIA Many variables for the perfect result Quality on every surface Combination of the use of the correct media in combination with the respective machine used Individual selection of the correct media for each workpiece Wet processing Water-compound mixture Holding and removal of waste from grinding media and workpieces Grinding effect remains unchanged Dry processing Polishing Polishing media impregnated with polishing agent The polishing media rub against the workpiece due to the finishing motion and remove material The result is a highly polished surface 42

41 MEDIA Many variables for the perfect result Plastic wet grinding media High quality wet grinding media High metal removal rate and fine surface creation Soft bond of the plastic in the chips prevents the surface of the workpiece from hardening and forming an orange peel. Use Grinding and fine grinding of non-ferrous metal Walnutshell granules Special impregnation process for highest quality! No polishing paste required for the first 3-4 batches Use : High gloss polishing of non-ferrous metals, jewellery, titanium, steel alloys 43

42 MEDIA Many variables for the perfect result Compounds For wet processing They ensure clean, bright workpieces Polishing pastes For high-quality surfaces Wooden polishing bodies Fine grinding and polishing of plastic, wood and horn 44

43 MEDIA Many variables for the perfect result Plastic polishing bodies For dry polishing for jewellery Due to their consistent geometry, there is no formation of dust, a decisive criterion in this area. Use Jewellery industry: especially suitable for silver jewellery Very well suited for hollow goods, lobster claw clasp Porcelain polishing bodies High-density ceramic bonded abrasive bodies with hard base material Use Wet polishing of heavy silver parts Wet polishing of ceramic parts 45

44 MEDIA Many variables for the perfect result Stainless steel bodies No material removal during processing Only smoothing and compaction Use Polishing, high-gloss polishing and pressure deburring of non-ferrous metals Zirconium oxide balls No material removal during processing Only smoothing and compaction Use Polishing, high-gloss polishing and pressure deburring of non-ferrous metals 46

45 SEPARATION UNITS 47

46 SEPARATION UNITS Serie FS - Waterseparation Separation within few minutes instead of hand separation Separation between workpiece and media with similar size Advantages: Short separation time Reliable and efficient separation No handwork Good price performance ratio Video 48

47 SEPARATION UNITS Series UNISEPA moveable sieve separation Moveable sieve - separation Compact Moveable Flexible Perfect for universal needs Advantages: Fast and user-friendly screen change Controllable rate of separation Extremely cost-effective Mobile for greater flexibility Video 49

48 FINISHING CENTRE Finishing of sample workpiece with no obligation and costs Individual customer advice Detailed documentation Finishing concept tailored to your needs 50

49 FINISHING CENTRE State of the art measurement technology Very experienced and highly qualified staff members Process research together with institutes and universities 51

50 THANK YOU FOR YOUR ATTENTION. 52