Sand mould of precoated sand for casting single piston ring and manufacturing method of sand mould

Abstract

The invention relates to a sand mould of precoated sand for casting single piston ring and a manufacturing method of the sand mould. The sand mould comprises a circular tray body, a pouring system arranged on the circular tray body, a retainer ring and air outlet holes, wherein the pouring system comprises a downsprue, a flow gate, a cross gate and a dead head, the downsprue penetrates through the middle part of the circular tray body, the flow gate arranged on the facade of the circular tray body is communicated with the downsprue through the cross gate, the flow gate is communicated with a ring body groove, the dead head is arranged to be opposite to the flow gate, and the dead head is communicated with the ring body groove through more than two inclined pouring gates; and the retainer ring higher than the surface of the sand mould is arranged on the periphery of the facade of the circular tray body, and more than four air outlet holes passing through the circular tray body are symmetrically arranged on the inner side of the ring body groove between the cross gate and the dead head along the axial line of the cross gate. The piston ring processed by the invention is stable in quality and high in yield, the piston ring casting has the advantages of clear outline, high dimension precision and good surface quality, and the piston ring casting is liable to clean, thereby reducing the processing allowance, reducing the successive processing cost and improving the production efficiency.

Description

technical field [0001] The invention relates to a film-coated sand sand mold for casting a single piston ring and a manufacturing method thereof, belonging to the technical field of casting piston rings for locomotives and vehicles. Background technique [0002] The piston ring is an important part of the locomotive engine. It plays the role of sealing, controlling lubricating oil, heat dissipation and supporting guidance in the engine. Since the piston ring is in a high temperature and high pressure working environment, its working conditions are extremely harsh, so the piston ring is required to have good Strength, wear resistance, elasticity and other comprehensive performance. Among the many types of piston rings, the single piston ring is the main product of most piston ring manufacturers because of its simple modeling method and large market demand. However, the single piston ring is produced by the wet film sand manual molding method, so the single piston ring made o...

AI Technical Summary

Problems solved by technology

Since green sand is made of bentonite as a binder, mixed with water and other additives, the sand mold made with green sand can be cast directly without drying, and the strength of the mold is not easy to grasp. Large, the amount of gas generated by the molding sand is not easy to control during the pouring process, so there are often casting defects such as sand inclusions, sand holes, and pores in the piston ring castings, and the quality of the piston rings is unstable, resulting in a low yield of the piston ring castings. The rate is low, and repetitive production waste is serious

[0004] (2), low production efficiency

Since the molding method of the tidal film is manual molding by workers, not only the labor intensity of the workers is high, the production environment is poor, but also the follow-up cleaning workload is relatively large, which directly increases the complexity of the process and reduces the production efficiency

[0005] For this reason, it is proposed to use the core-shooting molding process instead of the original wet-film sand manual molding process to produce single piston rings. However, due to the different cooling effects of coated sand and wet-film sand on molten iron, there will be large differences in the structure of piston ring castings. , the performance of castings produced by coated sand is not easy to meet the requirements of relevant technical indicators of piston rings. Therefore, a coated sand mold and its manufacturing method suitable for the production of single piston rings are designed and developed to meet its cooling effect on molten iron. The key to promote the application of this process to the production of single-piece piston rings

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