Method for carrying out evaporative pattern casting on dry cylinder liner machine body and model thereof

Abstract

The invention discloses a method for carrying out evaporative pattern casting on a dry cylinder liner machine body. The method particularly comprises the following steps that a foaming material is adopted to manufacture a lost foam pattern of the dry cylinder liner machine body; pre-coated sand is adopted to manufacture a pre-coated sand core of a water sleeve portion of the dry cylinder linear machine body, and a plurality of positioning core heads are arranged on the pre-coated sand core; the pre-coated sand core with the positioning core heads is loaded into the position, corresponding to the water sleeve portion, of the lost foam pattern; and the lost foam patter is stuck together. The method further discloses an evaporative pattern casting model, manufactured through the method, of the dry cylinder liner machine body. The evaporative pattern casting model comprises a lost foam pattern body, and the lost foam pattern body and the dry cylinder liner machine body are the same in structure; the water sleeve portion of the lost foam pattern body is provided with the pre-coated sand core; the positioning core heads are arranged on the pre-coated sand core, and are located on side face auxiliary holes in the water sleeve portion; and one end of each positioning core head is connected to the pre-coated sand core, and the other end of each positioning core head stretches out of the corresponding side face auxiliary hole. The pre-coated sand core technology and the positioning core head technology are combined for solving the problems that molten metal leaks, and the sand core is prone to shifting.

Description

technical field [0001] The invention relates to a lost foam casting method, in particular to a method for casting a dry cylinder liner body by the lost foam method, and also relates to a lost foam casting model of the dry cylinder liner body. Background technique [0002] Lost foam casting, also known as dry sand solid mold negative pressure casting, is called EPC abroad. It is one of the most advanced casting processes in the world at present. It is known as a "revolution" in the history of casting. It is called the 21st century at home and abroad. Green casting. According to the process requirements, this method first makes a foam plastic model, which is commonly referred to as a white mold, is coated with a special high-temperature-resistant paint, and after drying, it is placed in a special sand box, and then filled with dry sand according to the process requirements, and compacted by three-dimensional vibration. , casting molten metal in a vacuum state, at this time th...

AI Technical Summary

Problems solved by technology

[0003] At present, when making a dry cylinder liner body in the lost foam casting technology, due to the limited gap and complex geometric shape of the water jacket part between the cylinder liner and the shell, sand filling is often not solid, which will lead to a gap between the body and the cylinder liner. Leakage of molten metal, resulting in waste

The Chinese invention patent whose application publication number is CN103212669A discloses a lost foam casting model of an engine cylinder block and its casting method. The model includes a water jacket sand core for forming the water jacket part of the engine cylinder block casting model. The cover part is put into the film-coated sand core, which can effectively solve the problem of the leakage of molten metal between the machine body and the cylinder liner due to improper filling of dry sand, which leads to waste products

However, due to the fast flow rate of the molten metal during pouring, the moment the sand core touches the molten metal, the sand core will be displaced. The displacement of the sand core often leads to inaccurate internal structure and dimensions between the cylinder block and the cylinder liner, resulting in waste products.

Therefore, a positioning device is needed to locate the coated sand core. Usually, a positioning core head is fixed at each end of the sand core, but only the two sides are positioned. The moment the sand core contacts the molten metal, the sand core will still rotate.

However, adding a positioning device involves how to add it, and how to clean up the added positioning device after the casting is completed.

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