The cast base tray is an important support part. It bears the weight of the workpiece and transmits the thrust of the pusher in a hot state.
Therefore, it must have sufficient high temperature strength. The structural forms of the material tray are diverse, generally including ordinary type, bottom guide type and non-hardened type with the workpiece.
1. Ordinary type material tray: simple to manufacture, not easy to deform, reversible up and down, long service life, but the guide rail needs to be equipped with a guide device.
2. The guide type material tray at the bottom: it is stable when pushing materials and can simplify the guide rail structure. In contrast, the one with grooves is easier to deform when used.
The guide groove width should be 5mm ~ 10mm wider than the rail top, and the groove surface and rib space must be cut.
3. The type of material tray that does not quench with the workpiece: after it is released from the furnace, it is supported on the guide rails by two ears, the material tray flips over, and the workpiece automatically falls into the quenching tank.
Because the material tray is not quenched and does not withstand rapid changes in temperature, it has a long service life.
The material tray is generally cast from heat-resistant steel, and its size is determined by the shape and loading capacity of the typical workpiece.
The square structure is not easy to deform, easy to transport and turn, and has many applications. In order to ensure uniform contact between the workpiece and the atmosphere in the furnace, and on the premise of ensuring strength, the opening area of the material tray should be as large as possible, the distribution should be symmetrical and even, and cracking during quenching should be prevented.
Commonly used materials are 1.4849 and 1.4852.
