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 Advantages:
- Glass Ceramics can be machined
with conventional metal working machines.
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It is not necessary to sinter after
machining, because strength, hardness and zero-porosity
remain intact during machining.
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Production Process:
- Melting and thermal after-treatment
(crystallization) Microstructure: Glass, crystalline
structure, overall structure > 2-phase
microstructure.
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Shaping is done according to glass technical
aspects.
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Microstructure:
45% glass portion
55% crystalline phase (glimmer crystals
(F-glimmer)) |
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Surface Quality:
+/-0.01mm tolerances
RT = 2.5 - 3.0 mm
polished < 1m |
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Cutting Index:
Comparison: 25
High-Grade Steel: 229
Brass: 36 |
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Characteristics:
- Zero porosity (low helium performance --> application in high vacuum)
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Free from pores and no gas exhalation after the heat treatment
- High material
strength
- Insensitive towards surface defects
- Microstructure
hinders crack expansion
- Thermal expansion comparable with metal
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No wetting by liquid Al, Zn, Mg or Cu
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Processing of Glass Ceramics
1) Fixing
Clamp softly, so as to avoid inner tensions.
Those tensions can lead to break offs (chippings) during processing.
Most practical is the glue of the components in order to guarantee
tension freedom.
Improper for jaw chuck loading,
better use e.g. 2 semi shells from plastics or soft Aluminium for fixing of round
rods. 2)
Tools
Hard metal
tools (carbide tipped tools) to be preferred. The very hard K10 quality is well
qualified; heat discharging is very good.
3) Cooling
Pay attention to a very good cooling. Local overheating results
in a high thermal expansion and can lead to thermal stress, followed by skipping
or breaking of the relatively brittle material.
4) Processing Direction
Different from the processing of metals, it is better for brittle materials
to process from one edge towards the center of the material.
e.g.
lathing: Produce blanks longer and cut into lengths after longitudinal turning.
5) Thread
Produce thread preferably by turning on lathe. Do never use manual operation when
cutting thread. Even little tensions will immediately lead to outbreak of the
thread turn. |
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General
Guidelines for the machine tooling of DO CERAM G-600 with hard metal tools (carbide
tipped tools) |
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Method |
Lathing |
Drilling |
Milling |
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Tool |
Lathe Chisel |
Twist Drill2 Reboring Tool |
Contour Milling Cutter |
Contour Face Cutter |
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Contour Face Cutter |
Milling Head1 |
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Cutting Material |
Hard metal for short cutting (kurzspanende)
materials |
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Cutting Speed |
30-50 mmin-1 |
20 mmin-1 |
28 mmin-1 |
20 mmin-1 |
10-30 mmin-1 |
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Form Feed f |
0,05-0,02 mm |
0,1-0,2 mm |
0,02-0,05 mm |
0,01-0,02 mm |
0,01-0,02 mm |
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Clearance Angle |
6° |
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Effective Cutting Angle |
-3° to -10° |
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Angle Setting |
45° to 75° (90°) |
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Tilt Angle |
4° to -10° |
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1front milling
(face milling) with milling heads only partially
applicable
2carbide tipped, HSS-tools
(tools with high-speed steel blades, carbide tipped
tools) are only partially applicable for small
quantities (Vc 5-10m min-1)
If you need additional
information for fine machining (grinding, lapping...),
please contact our application engineers !!
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These properties were
measured on test samples. The values are typical
material properties and may vary according to
product configuration, geometry and
manufacturing process. |
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