Manufacturing method of tractor gearbox blank

Abstract

A manufacturing method of a tractor gearbox blank belongs to the field of agricultural machinery. The manufacturing method comprises the following steps: 1, dividing a tractor gearbox into upper and lower parts according to the design drawing of the tractor gearbox, and separately designing and manufacturing precoated sand moulds of the tractor gearbox; 2, placing the precoated sand moulds of the tractor gearbox on an automatic molding machine to make a sand shell mould and a sand core mould which are cast by precoated sand; 3, casting; and 4, taking out a casting and clearing. The manufacturing method has the characteristics that the production of the tractor gearbox blank can be efficiently realized, materials and labor are saved, machining quantity is reduced, casting flaws are reduced, the yield rate is increased, and automated production is easy to realize.

Description

technical field [0001] The invention belongs to the field of agricultural machinery, in particular to a blank manufacturing method of a tractor gearbox. Background technique [0002] The tractor gearbox is an important part of the tractor. Due to the need to install various parts inside, 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 machining accuracy; Most of the existing tractor gearbox blanks are cast with cast iron. The casting method is to first select the appropriate parting surface according to the gearbox design drawings, and make a combined model with the same shape as the gearbox. Most of the composite models are bounded by the parting surface as the joint surface of the composite model. Most of these models are made of wood or aluminum for handling and processing; The box is separated to take out the model, and a cavity with the ...

AI Technical Summary

Problems solved by technology

[0002] The tractor gearbox is an important part of the tractor. Due to the need to install various parts inside, 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 machining accuracy; Most of the existing tractor gearbox blanks are cast with cast iron. The casting method is to first select the appropriate parting surface according to the gearbox design drawings, and make a combined model with the same shape as the gearbox. Most of the composite models are bounded by the parting surface as the joint surface of the composite model. Most of these models are made of wood or aluminum for handling and processing; The box is separated to take out the model, and 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 is properly dried Finally, the sand box is closed, and the casting metal liquid is poured from the casting channel; fourth, after cooling, the sand box is removed, the sand mold is broken, the casting is taken out, the sprue and riser are taken out, and the tractor gearbox blank is completed. Production; when the molten iron is poured into the sand mold, the molten iron has a swelling 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 the shape of the cast blank The size is uncertain; due to the characteristics of the above process, the casting method has a large amount of labor for the workers to operate, high requirements for the skilled operation skills of the workers, a large working area, poor working environment, large dust, high roughness of the surface material of the casting, and the expected Large amount of processing, waste of raw materials, easy to change, low rate of qualified products and other defects

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