Heimerle+Meule Group Coin Blank Manufacture

Coin Blank Manufacture Tradition to Modern Innovation
David Fletcher – European Product Manager
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
Organisation
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Product Categories
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Abstract
Time honoured cast, roll and blank production processes are used to produce high
quality precious metal coin blanks.
This presentation will investigate how CAD/CAM series production with CNC, robot
handling and highly compressed material, producing a fine recrystallization
structure is adding a new dimension to these techniques.
This is opening the way for new finished coin possibilities to Mints around the world.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Numismatic Requirement
•
As Mints look to expand their product range and
choice, large diameter coins are becoming more
popular
•
Different shapes are also now requested such as
hexagonal and octagonal coins
•
Blanks required with very high and accurate weight
and dimensional specifications and tolerances
•
Low production yield is a common problem which
impacts cost
•
Market quality is required yet remains price
sensitive
•
Heavy collector blank products from 250gms up to
3kgs
•
Large diameter blanks from 40mm up to 150mm
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Traditional Production Process for 1kg Blanks
Continuous casting 120mm x 40mm
Rolling down to 13mm
Annealing
Stamping blanks dia 105mm
Yield approx
50%.
Stamping
deformation.
Stamping tool
required.
Turning each piece by hand
Highly manual
process.
Turning.
Weighing.
Finishing.
Weighing each piece by hand
Final polishing as required
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Innovation
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X & Y axis Robot Technology
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Automated turning
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Automated weighing
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Automated finishing
•
Diamond tools utilised to minimise
post processing
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for 1kg Blanks
Ingot casting
Rolling
Annealing
Yield approx 80%.
No deformation.
from stamping
process.
No tooling costs.
No investment in
large pressequipment.
CNC milling/ hammering at approx
dimension
Robot Tec turning, finishing & weighing
Fully automated
Robot Tec.
Fine-turning.
Weighing.
Finishing.
Fewer production steps
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for Cylinders
1.
Fine gold 999.9 or fine silver 999.9 is loaded into the continuous caster, melted and
cast.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for Cylinders
2.
The cast material is rolled, annealed as required and passed through a swaging / hammering
process to smooth the sides of the rods improving grain structure.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for Cylinders
3.
The rods are then cut to the near net length required as per the specifications.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for Cylinders
4.
The cylinders are packed into cartridges and loaded into the Robot Tec equipment.
This process comprises of automated turning, weighing and final finishing.
Once loaded the machine can run "lights out“ with no manual intervention required.
Each cylinder or blank takes less then 60 seconds to produce.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Production Process for Cylinders
5. On completion the blanks are ready for striking.
Heimerle + Meule / Sempsa JP / Cooksongold part of the Heimerle + Meule Group
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Robot Tec Video
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Results
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No scalping from continuous cast material
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No blank deformation from stamping
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Large presses are not required for production
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No tooling costs
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Reduction of process steps and manual handling
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Ra 0,025-0,033 mirror finish surface-quality
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Yield increase from 50% to 80%
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Handling free process “lights out”
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Increased production of coins & cylinders
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Dimensional tolerance +/-0,01-0,02 mm
•
Weight precision (1kg) 1001g-1002g (-nil+0,2%)
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Thank you for your attention
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