Test equipment for solidification structure of chromium white cast iron by pressure casting technology

Four-column vertical liquid die forging machine (Y32-1600T)

The main equipment of pressure casting experiment includes liquid die forging machine, special concave convex die, pouring ladle and pouring chute. The hydraulic forging machine is y32-1600t four column vertical liquid forging machine designed and manufactured by Hebei Hongkai Heavy Machine Tool Co., Ltd. its appearance is shown in Figure 1

Because the test piece is pf1214 plate hammer, its outline size is 694mm × 300mm × 110mm, as shown in Fig. 2, belongs to the specimen with larger contour and higher thickness. At the same time, the structure of the hammer sample is relatively simple, only the two sides have strip-shaped installation slots. If it is placed vertically, it will increase the difficulty of mold design and sampling. Therefore, the method of horizontal placement and direct liquid forging is selected for the compression scheme.

The sketch map of plate hammer (PF1214)

Due to the special profile of the hammer, it is rarely used to directly forge the thick and large parts in the previous pressure casting production, so it is necessary to design the special die for the hammer. The appearance of the special metal mold (concave convex type) used in this experiment is shown in Fig. 3 (a), and its principle is shown in Fig. 3 (b). In order to reduce the impact of the excessive vertical height of the alloy liquid on the mold cavity during pouring, it can also make the pressure transfer better. The special-shaped clamping cylinder first closes the die with the lower die, and then the upper extrusion cylinder drives the special-shaped punch to close the die for extrusion. In the process, the guide pillar and guide sleeve are used for positioning to ensure that the upper and lower dies will not be dislocated in the process of closing. Due to the heavy weight of the plate hammer, it is finally left in the lower die cavity. The design uses the lower extrusion cylinder to drive the ejector rod to push out the specimen and then take it out.

Experimental mold (concave-convex): (a) Experimental mold; (b) Schematic diagram of the mold (1. Upper half 2. Leader pin 3. Plate hammer 4. Lower half 5. Upper squeeze head 6. Clamping unit 7. Cavity 8. Lower squeeze head 9. Mold unloading)