Blank manufacturing method of tractor transmission

[0050] In order to further illustrate the technical solution of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings, such as Figure 1 to Figure 13 According to the design drawings of the tractor gearbox, in this example, the medium-sized tractor gearbox is taken as an example. The tractor gearbox is divided into upper and lower parts, and the outline size of the tractor gearbox is enlarged by 8-12 mm to make the upper part of the tractor gearbox. The upper sand shell upper mold 1 and the upper sand shell lower mold 2, the lower sand shell upper mold 3, the lower sand shell lower mold 4 of the shell mold and the lower sand shell mold are respectively made into the upper sand shell of the tractor gearbox and the tractor gearbox Lower sand shell; combine the upper sand shell of the tractor gearbox and the lower sand shell of the tractor gearbox to complete a complete sand shell with the same shape as the tractor gearbox; at the same time, divide the internal shape of the tractor gearbox into the upper part in the same way as the external shape. And the lower part, respectively make the upper sand core mold and the lower sand core mold of the tractor gearbox, which are the upper sand core upper mold 5, the upper sand core lower mold 6, the lower sand core upper mold 7 and the upper sand core lower mold 8. The upper sand core and the lower sand core are combined to form a complete shape of the inner cavity of the tractor gearbox; in this example, each set of molds is used to make the upper and lower sand shells and sand cores of the tractor gearbox at the same time; and the tractor gearbox sand shell and The sand core mold is installed on the sand shell sand core automatic forming machine to produce a sand shell with the same shape as the tractor gearbox housing 01 and a sand core with the same shape as the tractor gearbox cavity 02; the finished sand shell of the tractor gearbox Place the sand core on the pouring site, put the sand core into the sand shell according to the structure of the tractor gearbox, pour the molten iron with a good proportion into the sand shell, after cooling, open the sand shell, take out the casting, and connect the gate and The riser is removed, and impurities on the casting blank are cleaned, and the production of the brake disc blank is completed.

[0051] Because the sand shell and sand core are produced automatically during production, they can be mass-produced, which overcomes the complexity of clay sand or resin sand modeling, saves a lot of modeling sand, reduces production costs and labor intensity; at the same time, sand shell and sand core molds It has a long service life and overcomes the shortcomings of wooden or aluminum molds that are not durable.