Transformation > Milling - Turning - Machining - Polishing - Grinding - Other means
The electron beam drilling
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The process : at the place where the drilling will be carried out, a coating of 4 to 5 mm of silicone loaded with brass powder (named “ejection material”) is applied by centrifugation. When the electron beam strikes the piece, an extreme heat makes the metal melt instantaneously and is pro-
pagated till the silicone/brass coating. As the melting point of brass is much lower than the one of the refractory alloy of the spinner, it “subli-
mates” itself creating locally a high vapour pressure which contributes to the ejection of the molten part. As the energy is particularly high, each “pulse” of the electron gun causes the forming of a hole. The rates are very high : of the order to 3 holes superior to 1 mm per second and to 10 to 15 holes of 0.7 mm per second in 5 mm thickness.
The machine (see the sketch on the right) is made up basically with a 1 m³ chamber of drilling where the piece will be placed and an electron gun which is the main part of the installation.
The advantages : the electron beam machine can be operated with great precision. The power is defined by the accelerating voltage and the beam current. The position of the focusing point (working distance) is modified by an electromagnetic lens. The deviation, static or dynamic, is controlled by a system of electromagnetic coils. All the parameters of the beam can be adjusted continuously with a great accuracy. Consequently this machine is particularly high-performance (3 shifts work, 6/7 days). We have got 2 electron beam machines which enable us to drill holes of 0.4 to 1.2 mm of diameter in a depth of 4 to 12 mm.
Technical characteristics of our electron beam drilling machines
Brand name
Type
Characteristic(mm)
Maximal capacities(mm)
Remarks
IGM
EBOPULS
KS 19 P G 120 PMS
Machining floor
1 150 x 1 170 x 1 420
Ø 1 000 x Length 500
120 kV
0-120 mA
Diameter : 0.4 to 1.2 mm
Thickness : 4 to 12 mm
The electro-erosion machining
Thanks to our two types of electro-erosion equipment, we can machine any shape.
Technical characteristics of our electro-erosion machines
Brand name
Type
Strockes(mm)
Admissible weight
Length
Transv.
Vert.
SODICK
AQ 327 L
370
270
250
350 kg
SODICK
A 65 TR
650
450
350
1 000 kg
SODICK
AQ 35 L
350
250
250
550 kg
SAINT-GOBAIN SEVA - 43 Rue du Pont de Fer - BP 176 - 71105 CHALON-SUR-SAÔNE CEDEX, France - Tel. +33 (0)3 85 47 25 00 - Fax +33 (0)3 85 47 25 99
