Continuous casting and continuous forging forming process for aluminum wheel

Abstract

Disclosed is a continuous casting and continuous forging forming process for an aluminum wheel. The process combines the advantage of low-pressure filling stability of molten aluminum alloy, and utilizes the strengthening effect of extrusion deformation forging of a side mold locking ring and a pressure module to improve the mechanical properties of an aluminum wheel material to close to the forging level. A mold cavity is sealed by means of the side mold locking ring and a center mold locking taper, and the extrusion forging pressure acts on the surface of the aluminum alloy in the closed mold cavity, so that the requirement of equipment for mold closing tonnage is lowered, and the cost of the equipment is far lower than that of forging equipment and equivalent to that of casting equipment.

Claims

1. A continuous casting and continuous forging forming process for an aluminum wheel, comprising low-pressure filling and extrusion forging, wherein the process comprises feeding molten aluminum alloy into a mold assembly until a mold cavity is full, and holding a low pressure for a period of time; lowering a side mold locking ring and a center mold locking taper to completely seal the molten aluminum alloy in the mold cavity, removing the low pressure in a holding furnace, opening forced water cooling on two sides of corresponding spokes of top mold and bottom mold, and after a temperatures of the top mold and the bottom mold are in a liquid-solid coexistence state of the molten aluminum alloy, lowering a top pressure module to implement extrusion deformation strengthening, until the molten aluminum alloy is completely crystallized and solidified; and opening the mold assembly to take the casting out; the side mold locking ring is fitted with the four side molds through an oblique tapered surface with a tapered angle of 10 to 15, the center mold locking taper is fitted with a center sprue through an oblique tapered surface with a tapered angle of 0 to 5, the temperatures of the top mold and the bottom mold in the liquid-solid coexistence state of the aluminum alloy are 570 C. to 610 C., a lowering speed of the top pressure module is configured to be divided into first low-speed pressurization and then high-speed pressurization, the advancing speed of the low-speed pressurization stage is set to 0 to 0.2 mm/s, and the advancing speed of the high-speed pressurization stage is set to 0.5 to 0.8 mm/s.

2. The continuous casting and continuous forging forming process for an aluminum wheel according to claim 1, wherein the side mold locking ring is fitted with the four side molds through an oblique tapered surface with a tapered angle of 12 to 15.

3. The continuous casting and continuous forging forming process for an aluminum wheel according to claim 1, wherein the center mold locking taper is fitted with a center sprue through an oblique tapered surface with a tapered angle of 0.5 to 5.

4. The continuous casting and continuous forging forming process for an aluminum wheel according to claim 1, wherein the temperatures of the top mold and the bottom mold in the liquid-solid coexistence state of the aluminum alloy are 600 C. to 610 C.

5. The continuous casting and continuous forging forming process for an aluminum wheel according to claim 1, wherein the advancing speed of the low-speed pressurization stage of lowering the pressure block is set to 0.1 to 0.2 mm/s.

6. The continuous casting and continuous forging forming process for an aluminum wheel according to claim 1, wherein the advancing speed of the high-speed pressurization stage of lowering the pressure block is set to 0.5 to 0.7 mm/s.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The present application will be further illustrated below in conjunction with the drawings and embodiments.

(2) FIG. 1 is a schematic diagram of a continuous casting and continuous forging forming process device for an aluminum wheel according to the present application.

(3) FIG. 2 is a schematic diagram of a casting stage at which the mold cavity is full of molten aluminum alloy.

(4) FIG. 3 is a schematic diagram of a cooling stage at which a side mold locking ring and a center mold locking taper are lowered and mold water cooling is started.

(5) FIG. 4 is a schematic diagram of a stage from lowering of a pressure module to crystallization and solidification of aluminum alloy.

DETAILED DESCRIPTION OF THE INVENTION

(6) The details and working conditions of the specific device proposed by the present application will be described below in combination with the accompanying drawings.

(7) A continuous casting and continuous forging forming process for an aluminum wheel includes the steps of feeding molten aluminum alloy into a mold assembly until the mold cavity is full, and holding a low pressure for a period of time; lowering a side mold locking ring 9 and a center mold locking taper 2 to completely seal the molten aluminum alloy in the mold cavity, removing the low pressure in a holding furnace 1, opening forced water cooling on two sides of corresponding spokes of top mold 5 and bottom mold 3, and after the temperatures of the top mold and the bottom mold are in a liquid-solid coexistence state of the molten aluminum alloy, lowering a top pressure module 7 to implement extrusion deformation strengthening, until the molten aluminum alloy is completely crystallized and solidified; and opening the mold assembly to take the casting out.

(8) In order to rapidly switch the casting process and the forging process and improve the material structure properties of the product, when the mold cavity is full of the molten aluminum alloy, a thermocouple 8 placed on the top mold can simultaneously detect a rapid temperature rise and transmit this signal to an industrial control computer (IPC) of equipment, an instruction is issued, and the side mold locking ring 9 is lowered to extrude four side molds 4.

(9) The side mold locking ring is fitted with the four side molds through an oblique tapered surface with a tapered angle of 12 to 15.

(10) The center mold locking taper 2 is fitted with a center sprue 13 through an oblique tapered surface with a tapered angle of 0.5 to 5.

(11) The temperatures of the top mold and the bottom mold in the liquid-solid coexistence state of the aluminum alloy are 600 C. to 610 C.

(12) The lowering speed of the top pressure module can be divided into first low-speed pressurization and then high-speed pressurization. The advancing speed of the low-speed pressurization stage is set to 0.1 to 0.2 mm/s. The advancing speed of the high-speed pressurization stage is set to 0.5 to 0.7 mm/s.

(13) The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.