| 摘要 |
A foundry molding machine of the horizontal stack type such as shown in Hatch U.S. Pat. No. 3,958,621 employs a programmable solid state electrical control system operating in conjunction with a closed-loop hydraulic servo-system to obtain greater flexibility of set-up and higher mold uniformity and precision with fewer reject molds. Each of four of the major moving components of the machine may be provided with an encoder or position, velocity and direction monitoring device, such components being the two opposed squeeze rams, the mold traction device, and the pusher. Such monitors not only measure the final position of one squeeze ram, but also enable the calculation or measurement of the mold thickness so that the pusher cylinder can be controlled during its movement to contact a formed cake at a null condition and to move that cake into contact also at a null condition with a horizontally formed stack. While the mold thickness and the final position of the squeeze plates will vary for each mold formed, the positions and thicknesses may be determined for each cycle so that the pusher may be controlled to engage the mold at a slow or substantially zero velocity, accelerate to move the cake toward the stack, and again slow to a substantially zero velocity to bring the cake into engagement with the stack before further accelerating and moving the cake with the stack by a synchronous drive with the mold traction device.
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