A kind of casting method of internal combustion engine sand core oil pipe

Abstract

The invention relates to a casting method, in particular to a casting method for sand core oil pipe of an internal combustion engine, including molding, core making, box closing and pouring. Through all the inner cavity cores, the position of the oil pipe is determined by the positioning of the outer mold core heads on both sides. The steel pipe is selected as the core iron, and the raw material of the oil pipe core is chromite sand; when the box is closed, the oil pipe sand core is bent and deformed to prevent the end from increasing and disappearing. Compressed air is blown to the contraction joint of the mold for forced cooling, and a special anti-leakage core support is added to the position of the oil pipe when the box is closed; the invention has unique technology, can improve the quality of the casting, and reduce the product rejection rate.

Description

technical field [0001] The invention relates to a casting method, in particular to a casting method for a sand core oil pipe of an internal combustion engine. Background technique [0002] With the continuous advancement of internal combustion engine technology, the technical requirements of internal combustion engine frame, end cover and other products, which are the core components of internal combustion engines, are also constantly improving. The current market product difficulties mainly focus on the complex shape of the inner cavity, more oil pipes, and high dimensional accuracy. The oil pipe is a key area of ​​the main frame of the internal combustion engine. In order to ensure the dimensional accuracy and the bending degree of the oil pipe, the casting plan of the oil pipe is particularly important. The casting plan of the traditional sand core is as follows: 1) The positioning of the sand core of the oil pipe: the core is positioned at the bottom Core head positionin...

AI Technical Summary

Problems solved by technology

[0002] With the continuous advancement of internal combustion engine technology, the technical requirements of the internal combustion engine frame, end cover and other products, which are the core components of the internal combustion engine, are also continuously improving. The current market product difficulties are mainly concentrated in the complex shape of the inner cavity, more oil pipes, and high dimensional accuracy.

The oil pipe is a key area of ​​the main frame of the internal combustion engine. In order to ensure the dimensional accuracy and the bending degree of the oil pipe, the casting plan of the oil pipe is particularly important. The casting plan of the traditional sand core is as follows: 1) The positioning of the sand core of the oil pipe: the core is positioned at the bottom Core head positioning. This positioning method is more suitable for cores with a small height direction. For tubing cores with a large height direction and a relatively small diameter, only the lower box is used to position the core head. The core is prone to tilt, causing the tubing wall Deviations in thickness and size; 2) Selection of core iron for tubing sand core: the core generally adopts threaded steel core iron, which has poor strength and is easy to bend, causing the tubing sand core itself to easily deform, resulting in serious bending deformation of the tubing; 3) Selection of the type of sand core for oil pipe: quartz resin sand is used for ordinary casting, and the oil pipe is prone to shrinkage, sand sticking and other casting defects, which is difficult to meet the quality requirements of customers; 4) Prevention of deformation and bending of oil pipe sand core: bending deformation of oil pipe It is mainly related to temperature, buoyancy, and molten iron flow rate, that is, the inner gate directly rushes into the sand core. The traditional process scheme only relies on the strength of the core itself to resist the buoyancy of the molten iron and prevent the core from deforming. A large number of actual production proves that the deformation of the tubing core is still very large. serious

[0003] So far there is no way to overcome the above drawbacks

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