Water suffocating hole-free casting process for cylinder cover of single cylinder diesel engine and sand core for casting process

Abstract

The invention discloses a water suffocating hole-free casting process for a cylinder cover of a single cylinder diesel engine and a sand core for the casting process. The casting process comprises the following steps: 1, manufacturing an upper mold, a lower mold and the sand core, and coating the outer surface of the sand core with a low-gas-evolution coating; 2, manufacturing a core support, and mounting the core support at the gravity position on the upper plane of the sand core, wherein a gas discharging hole is formed in the center of the core support, the lower half part of the core support is arranged in the sand core, and the gas discharging hole in the center of the core support is communicated with the sand core to discharge gas in the sand core; 3, arranging waterway feet on the bottom surface of the sand core, and mounting gas discharging needles for discharging gas on the waterway feet and into the sand core; 4, mounting the sand core in the lower mold, and closing the upper mold to enable the inner surface of the upper mold to be attached to the upper plane of the core support; and 5, casting molten iron into the upper mold and the lower mold which are closed by virtue of a casting head. The positioning function of an original water suffocating hole is achieved by the core support, so that the process is simplified, the production efficiency is improved, and a great amount of time and fund investment are saved.

Description

technical field [0001] The invention relates to a casting process for a cylinder head of a single-cylinder diesel engine with no water and stuffy holes and a used sand core. Background technique [0002] The existing single-cylinder diesel cylinder head casting process mostly adopts the casting process with water-filled holes. The water-filled hole core mainly plays the role of positioning, exhaust, and sand production in casting, and has been used for many years in actual production. The technology is also relatively mature. But there are still some disadvantages, because after increasing the water hole, the two processes of water hole processing and water pressure cover are correspondingly increased, and in the process of using the diesel engine, water leakage often occurs due to the water hole cover falling off, especially in the diesel engine. Water-filled covers in coastal areas are prone to rust. At the same time, two processes of rough reaming and fine reaming are re...

AI Technical Summary

Problems solved by technology

But there are still some disadvantages, because after increasing the water hole, the two processes of water hole processing and water pressure cover are correspondingly increased, and in the process of using the diesel engine, water leakage often occurs due to the water hole cover falling off, especially in the diesel engine. Water-filled covers in coastal areas are prone to rust. At the same time, two processes of rough reaming and fine reaming are required to process water-filled holes, corresponding to two positioning fixtures, two drilling machines, and two workers for two stations. To carry out the operation, it is also necessary to regularly overhaul and maintain the machine tool, which will cost a lot of manpower and material resources, resulting in low production efficiency and high process costs.

Therefore, some enterprises have proposed the idea of ​​canceling the water stuffy hole, but they have been stagnant because there is no better advanced technology to replace the original old production process. If they want to cancel the water stuffy hole, other In terms of casting technology, it is necessary to solve a series of problems such as the positioning of the cylinder head in the sand core of the casting channel, exhaust sand and so on.

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