Process for preventing casting molded surface shrinkage porosity and inclusion by adopting direct chilling blocks

Abstract

The invention discloses a process for preventing casting molded surface shrinkage porosity and inclusion by adopting direct chilling blocks and relates to the technical field of lost foam casting production. The process comprises the steps that step1, positions of the chilling blocks are controlled; step2, shapes of the chilling blocks are controlled; step3, heights of the chilling blocks are controlled; step4, widths of the chilling blocks are controlled; step5, weights of the chilling blocks are controlled; and step6, the separation distance between the chilling blocks is controlled. According to the process for preventing the casting molded surface shrinkage porosity and inclusion by adopting the direct chilling blocks, by means of the manner that the positions, the shapes, the heights, the widths and the weights of the chilling blocks and the separation distance between the chilling blocks are controlled, the problem of the molded surface shrinkage porosity can be solved, the problem of the molded surface inclusion can also be solved, the heights, the widths and the weights of the chilling blocks are all appropriate, manual transportation is facilitated, the separation distance between the chilling blocks is controlled to be 35-50 mm, and the problem that the separation distance is too small and embedded sand is not solid to cause the molded surface inclusion defect is solved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting production, in particular to a technology for preventing shrinkage and inclusions on casting mold surfaces by using direct chilled iron. Background technique [0002] Lost foam casting is a foam model that is consistent with the shape of the casting and has a certain shrinkage ratio in size. After brushing with refractory paint and drying, it is buried in resin sand for molding, and poured under standard atmospheric pressure to vaporize the model. Liquid metal A new casting method that occupies the position of the model and forms a casting after solidification and cooling. [0003] With the continuous development of my country's foundry industry, foreign brands of high-end cars are all producing automobile molds in China. They have very strict requirements on the mold surface. Slight shrinkage or inclusions will require manufacturers to scrap and remanufacture. In lost foam casting, the ...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of my country's foundry industry, foreign brands of high-end cars are all producing automobile molds in China. They have very strict requirements on the mold surface. Slight shrinkage or inclusions will require manufacturers to scrap and remanufacture. In lost foam casting, the casting type Surface shrinkage and inclusions are the most common defects. At present, the most effective way to prevent surface shrinkage is to make direct chills. However, how to control the size of chills and the spacing between chills is a difficult problem for all foundries.

Images