Lower die locking structure and hub die applying same

Abstract

A lower die locking structure comprises a lower die used for enclosing a workpiece manufacturing cavity and a lower die mounting plate used for fixing the lower die. A melt inlet is arranged on the lower die, communicates with the workpiece manufacturing cavity and is used for conveying melt for the workpiece manufacturing cavity. The lower die locking structure is characterized in that the outeredge end of the lower die abuts against the lower die mounting plate. The lower die locking structure has the beneficial technical effects that due to the fact that a locking connecting mechanism is arranged between an upper connecting region and a lower connecting region, and the upper connecting region is located between the melt inlet and the outer edge end of the lower die, the thermal stressformed in the lower die in the production process can be appropriately offset through the locking connecting mechanism, the upward bulging deformation of the lower die under the action of the thermalstress is reduced, and the manufacturing dimension precision of the workpiece is improved.

Description

technical field [0001] The invention relates to a lower mold locking structure, and also relates to a wheel hub mold using the lower mold locking structure. Background technique [0002] Low-pressure casting, as a precision casting forming technology, is the main forming process of the current automobile aluminum alloy wheel hub. The lower mold is a component used to form the casting cavity of the wheel hub, and its machining dimensional accuracy and deformation during the casting process will affect the casting accuracy of the wheel hub. Such as figure 1 As shown, this is a wheel hub casting mold 100 with a relatively common structure at present, including a casting cavity 1 for casting a wheel hub, a lower mold 2 for enclosing the casting cavity 1, and a lower mold 2 for fixing The lower mold mounting plate 3. A melt inlet 20 is provided in the central area of ​​the lower mold 2, and a screw hole is provided on its outer edge end 21 (blocked by bolts 4 in the figure, no...

AI Technical Summary

Problems solved by technology

In the process of applying the hub casting mold 100 to produce casting and being in the filling and pressurizing stages, the casting cavity 1 is in a high temperature state, and the lower mold wall of the lower mold 2 at the periphery of the melt inlet 20 The body is subjected to a relatively high temperature, often up to 530°C, resulting in serious upward bulging deformation in the axial direction (direction indicated by arrow F in the figure), and the outer edge end 21 of the lower mold 2 The amount of deformation is minimal, which leads to poor dimensional accuracy of the manufactured hub and uneven thickness of the hub material

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