Continuous wire saw loop and method of manufacture thereof

Details Continuous wire saw loop and method of manufacture thereof Continuous wire saw loop and method of manufacture thereof

1997-11-28

2000-05-23

Scherbel, David A.

Stone working

Sawing

Endless

140112, F41B 700

Patent

active

060654627

ABSTRACT:
A closed loop wire saw loop, a method for making the closed wire saw loop, and an apparatus and method for slicing a work piece, in particular, a polysilicon or single crystal silicon ingot, utilizing a closed loop of diamond impregnated wire in which the work piece (or ingot) is rotated about its longitudinal axis as the diamond wire is driven orthogonally to it and advanced from a position adjoining the outer diameter ("OD") of the ingot towards its inner diameter ("ID"). In this manner, the diamond wire cuts through the work piece at a substantially tangential point to the circumference of the cut instead of through up to the entire diameter of the piece and single crystal silicon ingots of 300 mm to 400 mm or more may be sliced into wafers relatively quickly, with minimal `kerf` loss and less extensive follow-on lapping operations. The closed wire saw loop is made by squaring and welding the wire ends together and then twice heat treating the weld at about 1500 F.

REFERENCES:
patent: 3707865 (1973-01-01), Oriani
patent: 4911209 (1990-03-01), Smith et al.
patent: 5316052 (1994-05-01), Ritter et al.
Welding Metallurgy, iron-iron carbide phase diagram, Fig 4.12, p. 330, 1952.
Metals Handbook, vol. 6, "Welding, Brazing, and Soldering",Ernest Nippes, 320-321, 1983.
Laser Technology West Limited Brochure, "Diamond Wire Selection".
Laser Technology West Limited Brochure, "Solid State Controller/Capstan/Accessories".
Laser Technology West Limited Brochure, "Cutting with Diamond Wire".
Laser Technology West Limited Brochure, "Model 203000/Vertical Wire Saw".
Laser Technology West Limited Brochure, "Model 214000/Crystal Wire Saw".
Laser Technology West Limited Brochure, "Model 206000/Laboratory Wire Saw".
Laser Technology West Limited Brochure, "Model 208000/Guillotine Series Saws".
Laser Technology West Limited Brochure, "Automatic Guillotine Series Saws".
Laser Technology West Limited Brochure, "Model 228120/Profile Wire Saw".

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