Production process for water channel sand core of cylinder cap of single cylinder diesel engine by using cold core technology

Abstract

The invention relates to a production process for a water channel sand core of a cylinder cap of a single cylinder diesel engine by using a cold core technology and overcomes the problem that a conventional cold core box technology can only be used in manufacturing of multi-cylinder covers of diesel engines. According to the invention, concrete parameters of the cold core technology in the procedures of preparation of a mixture, manufacturing of the core and post-processing of the manufacturing process of the water channel sand core of the single cylinder cap are controlled, and arrangement of a water choking hole and a water channel hole on a cold core box in the process of core manufacturing is also controlled; so it is guaranteed that cost of manufacturing of the sand core of the single cylinder cap by using the cold core technology is greatly reduced compared to cost of manufacturing of the sand core of the single cylinder cap by using a hot core technology, and the water channel sand core with more qualified quality can be obtained.

Description

technical field [0001] The invention relates to a process for producing a single-cylinder diesel engine cylinder head water channel sand core by using cold core technology. Background technique [0002] Cylinder heads are generally divided into single-cylinder cylinder heads and multi-cylinder cylinder heads in terms of their structural simplicity. The cold box technology is used for core making. Compared with the hot box core making, the cold box core making method has incomparable advantages, mainly reflected in: ①. The temperature of the cold core making core is normal temperature, while the hot core making temperature is at 210~250℃, [0003] ②. The hardening time of hot core making is 6-9 times that of cold core making. [0004] ③. The strength of the sand core made by the cold box method is greater than that of the hot core, [0005] ④. The service life of the sand core made by the cold core is longer than that of the sand core made by the hot core; the main defects...

AI Technical Summary

Problems solved by technology

[0005] ④. The service life of the sand core made by the cold core is longer than that of the sand core made by the hot core; the main defects of the hot core core making process are:

[0006] ①. Hot core core making needs electric heating or gas heating, which requires high energy costs

[0007] ②. The core strength of the hot core method is lower than that of the cold core when the core is taken out.

[0008] ③. The temperature of the core is high, close to 200°C, and the operating environment for workers is poor. The high temperature of the core is prone to deformation, resulting in large fluctuations in the size of the casting

[0009] ④. The amount of resin added for hot core making is about 2%-2.3%, and that for cold core making is 1.6%-1.8%. Therefore, the cost of sand core making is high and the gas output is large

[0010] In view of the defects of the hot core process and the advantages of the cold core process, the hot core process is gradually decreasing in actual production, and more and more cold cores are used; but in the diesel engine single cylinder cylinder head Due to the limitation of technology and production cost, the core making process is still using hot core making process. No manufacturing workshop can use cold core technology to manufacture single-cylinder diesel engine cylinder heads, because they generally face the same problem. The problem is that the cost of manufacturing a single-cylinder diesel engine cylinder head using the cold core process is much greater than the cost of manufacturing a single-cylinder diesel engine cylinder head using the hot core process, and people also thought of manufacturing the core of the multi-cylinder diesel engine cylinder head cold core The process is used in the core making of single-cylinder diesel engine cylinder heads, but because the single-cylinder diesel engine cylinder heads are being produced, various process parameters, costs in various aspects, and yields of cold cores cannot be controlled, so in actual production China is still using hot core technology to manufacture single-cylinder diesel engine cylinder heads, which seriously lags behind production

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