Casting technology for improving balance of brake wheel

Abstract

The invention relates to a casting technology for improving balance of a brake wheel. The casting technology for improving balance of the brake wheel includes the following steps of manufacturing an upper sandbox, manufacturing a lower sandbox, combining the boxes, casting and cleaning. A sand mold structure is manufactured through rearranged molding sand, blowing pre-compacting is performed with compressed air, then, mechanical compacting is performed under the pressure of 100-120N / cm<2>, thus, the sand mold structure can have high hardness, and particularly, the portion, corresponding to the corner of the brake wheel, of the sand mold structure has high compaction degree and surface hardness; on the one hand, migration of the surface mold wall of the sand mold structure caused by casting of molten iron is avoided, and thus casts are prevented from deforming; on the other hand, a molten iron casting channel is communicated with a molding sand cavity through multiple points, thus, the temperature fields of the casts tend to be consistent, and solidified casts are favorable for forming uniform internal organizational structures; therefore, the balance accuracy of the brake wheel is improved, fine-machining amount and difficulty are reduced, and fine-machining time is shortened.

Description

technical field [0001] The invention relates to a casting process of a brake wheel, in particular to a casting process for improving the dynamic balance of a brake wheel. Background technique [0002] The brake wheel is a part with the outer cylindrical surface as the friction working surface, which forms a friction pair with the brake band. Dynamic balance is one of the most important parameters in the parameters of the brake wheel. For cast brake wheels, due to various factors such as uneven material or blank defects, errors in processing and assembly, and even asymmetrical geometric shapes in design, when the brake wheel rotates, each tiny The centrifugal inertial force generated by the particle cannot cancel each other out. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, generating noise, accelerating bearing wear, shortening the life of the machine, and causing destructive accidents in severe cases. For th...

AI Technical Summary

Problems solved by technology

The molding compaction in the existing casting process cannot guarantee the surface quality and hardness of the sand mold at these corners; after the molten iron is poured, the pressure of the molten iron on the surface of the sand mold will cause inconsistent surface displacement on the surface of the sand mold, so that the size of the casting cannot be guaranteed. An appropriate machining allowance of 34' is reserved on the brake wheel, and the finishing process will be carried out after the casting is cast. At this time, although the requirements for the molding process conditions are relatively low, the finishing process requires a large amount of work. On the one hand A lot of raw materials are wasted and time-consuming; on the other hand, it is difficult to finish the interior of the cavity 4', which is not conducive to the control of dynamic balance accuracy

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