B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/34
B22C 9/02 (2006.01) B22C 5/00 (2006.01)
Patent
CA 1091422
Abstract of the Disclosure A program controlled customized method for making molds comprises the steps of dispensing a layer of molding material including a mixture of sand and binder over a mold forming pattern by means of relative movement between a dis- pensing device and the pattern while selectively varying the ratio of sand and binder in the mixture dispensed in prede- termined areas of the pattern or in successive layers to pro- vide a mold of the desired strength in certain critical areas while conserving the amount of binder needed for the com- pleted mold. Apparatus of the invention includes a dispenser for mixing and discharging layers of the molding material onto the mold forming pattern, and means for producing selectively controlled relative movement between the dispenser and the pattern including a control system for varying the ratio of sand and binder in the mixture being dispensed in accordance with the relative position of the dispenser and the pattern. The apparatus may thus be controlled to provide for selective- ly variable ratios of sand and binder in accordance with the strength required of the mold at a particular position. The system also provides a selectively variable control of the thickness of each layer of molding material as the mixing head or pattern moves on a three axis coordinate system. For relatively small and light castings the mixing and dispensed head may be retained in a relatively fixed position while the pattern is selectively moved in a three axis coordinate grid while with large castings, the pattern is stationary and the mixing head is moved. The mixing and dispensing head is par- ticularly designed for use in the field of "no-bake" sand- resin-catalyst mixing and includes facilities for controlling the mixing operation so that the mixture does not set up and harden in the mixing head between mixing operations. Also, the constituency of successive layers may be varied and the amount of organic binder material minimized so as to reduce smoke and fumes during the casting operation.
285295
National Engineering Company
Smart & Biggar
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