Lower die of bearing seat precoated sand die

Abstract

The invention discloses a lower die of a bearing seat precoated sand die and belongs to the field of mechanical equipment production. The lower die comprises a lower die plate, a lower outer cavity, lower inner cavities, positioning holes, sand inlets, ventilation holes and installation holes. The lower die plate is located on the periphery of the lower outer cavity, and the lower outer cavity is located in the outer side of the interior of the lower die plate. The lower inner cavities are located in the inner side of the interior of the lower die plate. The positioning holes are located in the lower die plate. The sand inlets are formed in the positions, at the upper portion of the lower outer cavity, on the lower die plate and communicate with the interior of the lower outer cavity and the interiors of the lower inner cavities. The ventilation holes are formed in the lower die plate and communicate with an overflow channel between the lower outer cavity and the lower inner cavities. The installation holes are formed in the lower die plate and are matched with an installation plate of an automatic sand shell forming machine. The lower die of the bearing seat precoated sand die has the beneficial effects that production of a bearing seat blank can be efficiently achieved, materials and manual work are saved, the machining amount is reduced, casting defects are reduced, the yield is increased, and automatic production is easy to achieve.

Description

technical field [0001] The invention belongs to the field of mechanical equipment production, and in particular relates to a lower mold of a film-coated sand mold for a bearing seat. Background technique [0002] The bearing seat is the supporting part of the bearing, usually in the shape of a box; such as figure 1 As shown, the inner cavity of the bearing seat needs to adapt to the shape of the outer ring of the bearing, and the outer shell of the bearing seat needs to adapt to various installation environments, so its structure and shape are relatively complicated. Most of its manufacturers use metal casting to produce blanks, and then perform machining , in order to obtain better stability and processing accuracy; most of the existing bearing seat blanks are cast with cast iron, the casting method is firstly to select the appropriate parting surface according to the design drawings of the bearing seat, and to make the same shape as the bearing seat Combined model, most o...

AI Technical Summary

Problems solved by technology

[0002] The bearing seat is the supporting part of the bearing, usually in the shape of a box; such as figure 1 As shown, the inner cavity of the bearing seat needs to adapt to the shape of the outer ring of the bearing, and the outer shell of the bearing seat needs to adapt to various installation environments, so its structure and shape are relatively complicated. Most of its manufacturers use metal casting to produce blanks, and then perform machining , in order to obtain better stability and processing accuracy; most of the existing bearing seat blanks are cast with cast iron, the casting method is firstly to select the appropriate parting surface according to the design drawings of the bearing seat, and to make the same shape as the bearing seat Combined model, most of this combined model is bounded by the parting surface as the joint surface of the combined model. Most of these models are made of wood or aluminum for handling and processing; second, put the model into the sand box and fill it with casting sand And tamping, the sand box is separated and taken out the model, a cavity with the same shape as the model is formed in the middle of the sand in the sand box, and then the casting channel and riser are made to complete the sand mold making before casting; thirdly, the sand mold After proper drying, close the sand box and pour the molten metal into the casting channel; fourthly, remove the sand box after cooling, break the sand mold, take out the casting, take out the sprue and riser, and you are done The production of the blank of the bearing seat; when the molten iron is poured into the sand mold, the molten iron has an expansion force on the sand mold, and the sand mold is relatively soft, which will change the shape of the inner cavity of the sand mold, and this change is uncertain, resulting in casting out Due to the characteristics of the above process, the casting method has a large amount of labor for the workers, high requirements for the skilled operation skills of the workers, a large working area, poor working environment, large dust, and roughness of the surface material of the casting. Defects such as high value, large amount of reserved processing, waste of raw materials, easy change, low qualified yield, etc.

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