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Improvement of feeding efficiency by laser heating of metal in riser head

A laser heating and riser technology, applied in the field of casting technology, can solve problems such as unfavorable automation, sand particles entering the cavity, and casting sand sticking

Inactive Publication Date: 2006-09-06
湖南嘉程增材制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, this kind of heating and heat preservation riser is cumbersome to operate, which is not conducive to the realization of automation, and it is easy to cause sand particles to enter the mold cavity during operation, resulting in defects such as sand sticking in castings.

Method used

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  • Improvement of feeding efficiency by laser heating of metal in riser head

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Embodiment Construction

[0009] Before implementing the present invention, the relevant process parameters must be calculated first, and the calculation results are set as the initial values ​​of the process parameters. First, calculate the solidification time of the casting, the parts of the casting that need to be fed and the volume of the supplementary metal according to the pouring process parameters, the structure of the casting and its material thermophysical characteristics, and the characteristics of the mold, so as to determine the shape, size and position of the riser and the feeding channel The maintenance time; then calculate the heat P radiated by the surface of the metal in the riser per unit time r and the heat lost by conduction through the mold P c , because the absorption rate α of the liquid metal to the laser can be determined, and the formula αP l =P r +P c Calculate the laser power P l (The actual power also needs to be determined by P l multiplied by an empirical coefficien...

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Abstract

The invention relates to a method that heating the metal inside the riser to improve the feeding efficiency in the process of cast molding. The method uses the liquid metal inside the riser to fill the slits left by shortened volume in the processes of cooling and solidifying liquid metal when in casting. The invention uses the laser to heat the metal liquid level inside the riser to keep the liquid condition; therefore, the feeding channel can keep free in the metal solidification process to improve the feeding efficiency. The invention can avoid sand into the die cavity to cause defect, and it uses the laser with higher electric-optical transformation efficiency to reduce the cost. The invention also provides the technique keys and parameters.

Description

1. Technical field [0001] The invention relates to a casting process in the field of metal material forming. Specifically, it relates to a method for heating the inner metal of the riser and improving the feeding efficiency in the process of casting forming. 2. Background technology [0002] During the casting process, the liquid metal is poured into the mold, gradually cooled and solidified into shape. During this process, the volume of the metal shrinks due to the temperature decrease of the metal and the phase transition from liquid to solid. If there is not enough liquid metal to fill the voids left by volume shrinkage during cooling and solidification, macroscopic shrinkage cavities or microscopic porosity will occur, which will greatly reduce the quality of castings and may cause castings to be scrapped. Therefore, a riser is usually provided in the process, and the liquid metal in the riser is used to supplement the reduced volume and enter the left gap during the c...

Claims

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Application Information

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IPC IPC(8): B22D27/06
Inventor 刘继常
Owner 湖南嘉程增材制造有限公司
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