Gating design method for die-casting formation of large thin-wall element with narrow flange

Abstract

The invention provides a gating design method for die-casting formation of a large thin-wall element with narrow flange. The method comprises the following steps: step 10, calculating the section areaof a mater gate, and dividing the section area value to each gate so as to obtain the section area of each gate; step 20, calculating the width of each gate; step 30, calculating cycloid base radiuses of non-edge gate outlines according to the gate widths so as to obtain the cycloid equation of each non-edge gate outline; step 40, calculating cycloid base radiuses of two-edge gate outlines according to the gate widths so as to obtain the cycloid equation of the two-edge gate outlines; and step 50, designing the gate cross dimensions according to the section areas of the gates and the outlinesizes. The method changes the conventional straight-line-form gate into a continuous curve form without point of discontinuity, takes advantage of the isochronism of the cycloid to reduce the flowingpower loss of a fused mass, causes die-casting fronts to simultaneously reach a destination, and effectively reduces the die-casting defects.

Description

【Technical field】 [0001] The invention relates to a method for designing a runner in a die-casting mold, in particular to a method for designing a two-way tangential cycloidal gate for die-casting of a large thin-walled part with a narrow flange. 【Background technique】 [0002] Large thin-walled die-casting parts, especially large-scale thin-walled box-type die-casting parts, are important parts used for load bearing, rotation, lighting and other occasions, such as electric cutting machine gearbox, air-cooled direct injection diesel engine body, light alloy intake manifold Tubes, etc. are all such parts. The maximum size of this type of die-casting can reach more than 400mm, and the thickness can reach 1.5mm or less. The maximum size of the die-casting mold often reaches more than 800mm. [0003] Large thin-walled box-type die-casting parts have the characteristics of complex structure, high precision requirements, high performance requirements for bearing alternating loads...

AI Technical Summary

Problems solved by technology

However, the mold design and manufacture are very difficult

Existing problems include: too thin or uneven wall thickness is prone to defects such as flow marks, incomplete corners or cracks, cold shuts, and slag inclusions. The quality stability of products produced by molds designed according to traditional methods is poor, and it is difficult to meet the requirements of related technologies. Require

In this way, defects such as cold shut, under-injection, cracks, and pores will appear at the front of the melt, resulting in an increase in the reject rate

[0006] Therefore, in order to improve the structure of the gating system, it is necessary to take measures to solve the problem of the large attenuation of the melt pressure and velocity due to the existence of the flange. At the same time, it is necessary to reduce the structure of the gate in the design of the die-casting process, thereby reducing the flow of the melt stress and power loss

Images