PERFECT SURFACES WORLDWIDE A WELCOME FROM THE TECHNOLOGY LEADER in - - PowerPoint PPT Presentation

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PERFECT SURFACES WORLDWIDE A WELCOME FROM THE TECHNOLOGY LEADER in - - PowerPoint PPT Presentation

Oct 25, 2023 223 likes •736 views

PERFECT SURFACES WORLDWIDE 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

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PERFECT SURFACES WORLDWIDE

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PERFECT SURFACES WORLDWIDE

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.

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MARKETS

AUTOMOTIVE INDUSTRY TOOLMAKING INDUSTRY

STAMPED, TURNED AND MILLED PARTS

AEROSPACE INDUSTRY

MEDICAL AND PHARMACEUTICAL INDUSTRY CERAMIC AND PLASTIC PARTS JEWELLERY AND WATCHMAKING INDUSTRY

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JEWELLERY AND WATCHMAKING INDUSTRY

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JEWELLERY AND WATCHMAKING INDUSTRY Surfaces like hand-polished

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  • 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
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  • 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 pre-

polishing

  • Afterwards, each individual piece of jewellery is polished by hand to a high gloss

finish and galvanized if necessary

JEWELLERY AND WATCHMAKING INDUSTRY Traditional process

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  • 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

JEWELLERY AND WATCHMAKING INDUSTRY The OTEC process

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  • 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

JEWELLERY AND WATCHMAKING INDUSTRY Advantages with OTEC

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  • 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

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HOW CAN WE ACHIEVE A SMOOTH SURFACE? Chemical and mechanical polishing

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MASS FINISHING for jewellery and watchmaking industry

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DISC FINISHING MACHINES ELECTROPOLISHING MACHINES DRAG FINISHING MACHINES

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DISC FINISHING MACHINES

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  • 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

DISC FINISHING MACHINES OTEC CF Standard

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  • Especially suitable for the dry processing of jewellery
  • Bench type machine with aluminium profile frame with optional
  • ne 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

DISC FINISHING MACHINES Series CF-T (Bench type machine)

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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
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DISC FINISHING MACHINES

  • 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

Type of disc finishing machine

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DISC FINISHING MACHINES

  • 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

Media

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DISC FINISHING MACHINES

  • 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

Output quality of the workpieces

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DISC FINISHING MACHINES Preparation process step by step

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Casting tree Cutting the sprue Magnetic polishing Removal of the sprue Sandpaper OTEC-process

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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.

DISC FINISHING MACHINES Process parameters

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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.
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DISC FINISHING MACHINES

10 l water/compound flow per hour 10 l water/hour flow WITHOUT compound

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.
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DISC FINISHING MACHINES

1 l water/compound flow per hour 10 l water/compound flow per hour

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

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+ + +

Wet grinding Dry grinding Dry polishing

DISC FINISHING MACHINES Type of process

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  • 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

DISC FINISHING MACHINES Wet process - grinding and smoothing/polishing

gap 0,4 mm Plastic chips

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  • 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

DISC FINISHING MACHINES Dry process – grinding and polishing

Walnut shell granules gap 0,05 mm

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ELECTROPOLISHING MACHINES

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  • 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

ELECTROPOLISHING MACHINES Advantage EPAG FLEXMODULAR

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Video

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DRAG FINISHING MACHINES

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  • 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

DRAG FINISHING MACHINES Series DF

Video

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EXAMPLES OF APPLICATIONS JEWELLERY AND WATCHMAKING INDUSTRY

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EXAMPLES OF APPLICATIONS

Ring Earring Pendants Broaches Mini Sets Stamping Bracelets Tube Earrings Tube Bracelets Hollow Chain Laser Cut Electroform Electrofusion

Overview - Which jewellery is suitable for processing?

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  • 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

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DISC FINISHING MACHINES For smaller jewellery parts (less than10 g)

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  • Stamped parts and pressings with a wall thickness of only

0.1 - 0.15 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)

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DISC FINISHING MACHINES For stamped and pressed parts

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  • Only one processing stage for deburring, edge rounding, grinding and high gloss polishing
  • Individually coordinated multi-stage process for perfect results

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DISC FINISHING MACHINES For functional parts of mechanical watches

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  • 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

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DISC FINISHING MACHINES Processing of corals and amber

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  • Grinding, smoothing and high gloss polishing
  • Optimum results independent of the material

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DISC FINISHING MACHINES Processing of buckles and straps

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  • Heavy workpieces, e. g. heavy jewellery or watch housings, are fixed in drag finishing machines with appropriate holders

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DRAG FINISHING MACHINES For larger jewellery parts (more than10 g) and watch housings

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  • 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

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ELECTROPOLISHING MACHINES Processing of filigree jewellery parts

Jewellery before (left) and after (right) the OTEC treatment

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MEDIA JEWELLERY AND WATCHMAKING INDUSTRY

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  • 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

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MEDIA Many variables for the perfect result

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  • 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

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MEDIA Many variables for the perfect result

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  • 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

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MEDIA Many variables for the perfect result

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  • 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

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MEDIA Many variables for the perfect result

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  • 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

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MEDIA Many variables for the perfect result

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SEPARATION UNITS

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  • 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

SEPARATION UNITS Serie FS - Waterseparation

Video

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  • 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

SEPARATION UNITS Series UNISEPA – moveable sieve separation

Video

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FINISHING CENTRE

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

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  • State of the art measurement technology
  • Very experienced and highly qualified staff members
  • Process research together with institutes and universities
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THANK YOU FOR YOUR ATTENTION.