Casting technology of planet carrier

Abstract

The invention discloses a casting technology of a planet carrier. The technology comprises following steps of modeling procedure; shell making, wherein a riser is formed in the centre of the top of ashell; clay core making, wherein a ground clay core is horizontally placed on the center in the shell; sand box making, wherein the mold thickness of a sand box is controlled to be 20 to 30 mm; moltenmetal smelting, wherein a raw material is put into a melting furnace to be smelted, a nodulizing agent is added into the furnace for nodulizing, and finally a nucleating agent is added for nucleating; casting forming, wherein the top riser water inlet tap casting pouring process is adopted, and molten metal is poured into the metal through the riser; casting treatment, wherein a casting is groundand subject to heat treatment. The riser tap casting process system is reasonably arranged, and therefore the filling and feeding aims are achieved, the production operation is simplified, and the casting process yield reaches above 85%.

Description

technical field [0001] The invention relates to the technical field of planet carrier casting, in particular to a casting process of a planet carrier. Background technique [0002] The planetary carrier is one of the main components of the planetary gear transmission. The planetary wheel shaft or bearing is mounted on the planetary carrier. When the planetary wheel is used as a basic component, it is the part that bears the largest external force moment in the mechanism. The structure of the planetary carrier is mainly composed of the above The upper plate and the lower plate are provided with planetary shaft holes at positions where the connecting ribs are staggered, and the centers of the upper and lower plates are provided with central axis holes. [0003] The planetary carrier is mainly formed by casting, and the quality requirements of the planetary carrier are relatively high during the casting process. From the analysis of technical requirements, materials, and struc...

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Problems solved by technology

From the analysis of technical requirements, materials, and structural characteristics, the production of planetary carriers mainly has the following difficulties: the casting is high-strength ductile iron, and the smelting process and operation are very difficult; the requirements for dimensional accuracy and surface quality are high; the connecting ribs on the casting are relatively thick and large , it is easy to form casting defects such as shrinkage porosity and shrinkage cavity in this part, and it is difficult to guarantee the internal quality of the casting

[0004] In order to avoid the phenomenon of shrinkage cavity and shrinkage porosity in the casting process, in the prior art, internal cooling irons are placed on the hot joints, but in the case of mass production, it is very inconvenient to place cold irons on the multiple arc vertical hot joints of the castings. It is convenient, and there are difficulties in the manufacture and recycling of formed cold iron; in addition, in the prior art, a feeding riser is also used on the mold, and the feeding riser is connected through a ring runner, because the riser The volume is large, the sprue is long, and the riser, gate, and sprue of each blank require a large amount of molten iron, resulting in waste of molten iron, a very low process yield, and an increase in the cost of each product

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