Directional solidification device for multi-spoke aluminum alloy wheel

Abstract

The invention discloses a directional solidification device for a multi-spoke aluminum alloy wheel. The directional solidification device comprises a side die, a top die, coolers and a bottom die, wherein each of the cooler comprises a directional exhaust hood, a cylindrical louver-type cooling fin, a connecting plug, an air inlet pipe, a heat conducting copper bar, a cooling bar and a thermocouple; the quantity of the coolers is 7-25; circular through holes are drilled in the area, which is difficult to directionally solidify, of the side die; the coolers are assembled in the through holes; the diameter of each cylindrical louver-type cooling fin is 40-55 mm, and the height is 30-50 mm; the directional exhaust hoods coat the cylindrical louver-type cooling fins; the connecting plugs are mounted in the central area of the bottom; circular holes with the diameter of 1.5-2.5 mm are uniformly distributed on the connecting plugs; the heat conducting copper bars are connected with the cooling bars; the diameter of each cooling bar is 20-30 mm; blind holes with the diameter of 4-6 mm are drilled in the cooling bars; the thermocouples are mounted at the positions, close to thermal nodes, of the blind holes and connected with a control system in a low pressure casting control cabinet. The device has the characteristics of high stability, good production stability and high casting quality.

Description

technical field [0001] The invention relates to the field of aluminum alloy wheel casting for automobiles, in particular to a multi-spoke aluminum alloy vehicle [0002] Wheel directional solidification device. Background technique [0003] At present, there are more than 200 large and small automobile aluminum alloy wheel manufacturers in my country, and the output accounts for more than 60% of the global aluminum wheel production. It has become a veritable aluminum wheel manufacturing country. However, the casting technology of my country's automobile aluminum alloy wheels is at the middle level in the world. At present, the aluminum wheel industry generally adopts the low-pressure casting method. The biggest difficulty in low-pressure casting is the control of the temperature gradient of the mold temperature field during the casting process and the control of the sequential solidification during the casting process. Nodes are difficult to eliminate, and the above probl...

AI Technical Summary

Problems solved by technology

At present, the aluminum wheel industry generally adopts the low-pressure casting method. The biggest difficulty in low-pressure casting is the control of the temperature gradient of the mold temperature field during the casting process and the control of the sequential solidification during the casting process. Nodes are difficult to eliminate, and the above problems are more prominent for multi-spoke aluminum wheels

The current development trend of aluminum wheels is that the shape is more and more complex. The number of spokes of the original wheel is 5-7, and the width of the spokes is 50-80mm; now, due to the beautiful appearance and variability of the product, the spokes of some products have 7-7. 25, the spoke width is only 20-30mm, which causes more aluminum solution to pass through the joint between the rim and the spoke, and it is difficult to directional solidify in this area

[0004] In order to solve the above problems, the commonly used control measures in the industry are to add cooling air ducts, place cold iron rods, or increase feeding channels at the positions where it is difficult to directional solidify. Although the above methods can have certain effects, the existing air ducts During the blowing process, due to the rebound wind, the impact on the adjacent area is caused, that is, the feeding channel in the adjacent area is solidified in advance, and the local looseness of the rim causes air leakage; the poor heat conduction and heat dissipation effect of the cold iron rod is not effective in eliminating the hot node. Obviously; the use of enlarged feeding channel will cause problems such as excessive blank weight, excessive machining allowance, and reduced product yield

In addition, the above improvement measures have poor repeatability and reproducibility in the production process, the improvement effect of shrinkage cavity and shrinkage porosity is not obvious, the pass rate of product casting is not high, and the mechanical properties are not high

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