Exhausting device of low-pressure aluminum alloy wheel casting mold

Abstract

An exhausting device of a low-pressure aluminum alloy wheel casting mold, which includes a control mainframe, a connecting line, a gas storage station, a ventilating pipeline, gas inlet plugs, an exhausting plug and the like, the control mainframe is connected with the gas storage station through the connecting line, and the gas storage station is connected with the gas inlet plugs through the ventilating pipeline; the gas inlet plugs are arranged at the bottom mold window; the mold filling process of the high-temperature molten aluminum can be completed in a relatively oxygen-free environment, direct contact between the molten aluminum and oxygen is avoided, and the occurrence probability of the oxidation slag inclusion defect in the wheel casting process is effectively controlled, so that the internal quality of the casting is remarkably improved.

Claims

1. An exhausting device of a low-pressure aluminum alloy wheel casting mold, comprising: a control mainframe, a connecting line, a gas storage station, a ventilating pipeline, gas inlet plugs, an exhausting plug, gas inlet mark lines, exhausting mark lines, and a small air duct, wherein the control mainframe is connected with the gas storage station through the connecting line; the gas storage station is connected with the gas inlet plugs through the ventilating pipeline and stores inert gas which is input into a mold cavity of the casting mold before filling the mold cavity with molten aluminum, in order to protect the molten aluminum inside the mold cavity from contacting oxygen; the gas inlet plugs are arranged at a window of a bottom mold of the casting mold for allowing the inert gas entering the mold cavity through channels formed by the gas inlet mark lines, and the exhausting plug is positioned at an inner rim of a top mold of the casting mold for exhausting air and the inert gas out of the mold cavity through channels formed by the exhausting mark lines; the number of the gas inlet plugs is 1 to 3, one end of each of the gas inlet plugs is provided with an outer thread, and the inner diameter of each of the gas inlet plugs is 5 to 8 mm; the gas inlet mark lines are arranged on the gas inlet plugs, the number of the gas inlet mark lines is 3 to 6, the width of each of the gas inlet mark lines is 0.2 to 0.3 mm, and the height of each of the gas inlet mark lines is 10 to 20 mm; the exhausting plug is stepped, the exhausting mark lines are arranged on the exhausting plug, the number of the exhausting mark lines is 3 to 6, the width of each of the exhausting mark lines is 0.2 to 0.3 mm, and the height of each of the exhausting mark lines is 10 to 30 mm; the ventilating pipeline is configured to be in a single-pipe double-inlet mode, and the ventilating pipeline is in welded or threaded connection with the gas inlet plugs; the inert gas can be argon gas or nitrogen gas, and gas pressure is set as 0.2-0.6 Mpa.

2. The exhausting device of the low-pressure aluminum alloy wheel casting mold according to claim 1, wherein the number of the gas inlet plugs is 1, the inner diameter of the gas inlet plug is 8 mm, the gas inlet mark lines are arranged on the gas inlet plug, the number of the gas inlet mark lines is 3, the width of each of the gas inlet mark lines is 0.3 mm, and the height of each of the gas inlet mark lines is 10 mm; the exhausting mark lines are arranged on the exhausting plug, the number of the exhausting mark lines is 3, the width of each of the exhausting mark lines is 0.3 mm, and the height of each of the exhausting mark lines is 10 mm; the ventilating pipeline is in threaded connection with the gas inlet plugs, the inert gas is argon gas, and the gas pressure is set as 0.6 Mpa.

3. The exhausting device of the low-pressure aluminum alloy wheel casting mold according to claim 1, wherein the number of the gas inlet plugs is 2, and the inner diameter of each of the gas inlet plugs is 7 mm; the gas inlet mark lines are arranged on the gas inlet plugs, the number of the gas inlet mark lines is 5, the width of each of the gas inlet mark lines is 0.25 mm, and the height of each of the gas inlet mark lines is 15 mm; the exhausting mark lines are arranged on the exhausting plug, the number of the exhausting mark lines is 5, the width of each of the exhausting mark lines is 0.25 mm, the height of each of the exhausting mark lines is 20 mm, the ventilating pipeline is in welded connection with the gas inlet plugs, the inert gas is nitrogen gas, and the gas pressure is set as 0.5 Mpa.

4. The exhausting device of the low-pressure aluminum alloy wheel casting mold according to claim 1, wherein the number of the gas inlet plugs is 3, and the inner diameter of each of the gas inlet plugs is 5 mm; the gas inlet mark lines are arranged on the gas inlet plugs, the number of the gas inlet mark lines is 6, the width of each of the gas inlet mark lines is 0.2 mm, and the height of each of the gas inlet mark lines is 20 mm; the exhausting mark lines are arranged on the exhausting plug, the number of the exhausting mark lines is at least 6, the width of each of the exhausting mark lines is 0.2 mm, the height of each of the exhausting mark lines is 30 mm, the ventilating pipeline is in threaded connection with the gas inlet plugs; the inert gas is nitrogen gas, and the gas pressure is set as 0.2 Mpa.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic arrangement diagram of an improved low-pressure wheel casting mold system of the present invention.

(2) FIG. 2 is a schematic diagram of an exhausting device of a low-pressure aluminum alloy wheel casting mold of the present invention.

(3) FIG. 3 is a structural schematic diagram of gas inlet plugs of the exhausting device of the low-pressure aluminum alloy wheel casting mold of the present invention.

(4) FIG. 4 is a structural schematic diagram of an exhausting plug of the exhausting device of the low-pressure aluminum alloy wheel casting mold of the present invention.

(5) FIG. 5 is a structural schematic diagram of the exhausting plug of the exhausting device of the low-pressure aluminum alloy wheel casting mold of the present invention.

(6) FIG. 6 is a structural schematic diagram of a ventilating pipeline of the exhausting device of the low-pressure aluminum alloy wheel casting mold of the present invention.

(7) In Figures: 1control mainframe, 2connecting line, 3gas storage station, 4ventilating pipeline, 5gas inlet plug, 6exhausting plug, 7gas inlet mark line, 8exhausting mark line, 9small air duct.

DETAILED DESCRIPTION OF THE INVENTION

(8) As shown in FIG. 1, during mold closing, the control mainframe 1 sends out a signal and transmits an instruction to the gas storage station 3 through the line 2 to make the gas storage station 3 automatically turn on the inert gas container control valve, inert gas flows to a bottom mold back cavity through the ventilating pipeline 4 and enters a mold cavity through the gas inlet plugs 5 arranged at a window. After a liquid lifting stage is completed, a time controller inside the mainframe also rapidly transmits the signal to the gas storage station 3, so that the control valve is turned off to complete the process of gas delivery towards the cavity. At a mold filling stage, high-temperature molten aluminum is always located in a good oxygen-free environment, and mold filling crystallization is achieved under the protection of the inert gas. Meanwhile, the exhausting plug 6 is arranged at an inner rim so that on one hand, the original air in the cavity can be dispelled during gas feeding; on the other hand, the inert gas can also be smoothly exhausted under the forcing of the molten aluminum, the formation of back pressure in the cavity is avoided, and then mold filling stability is not affected. The above process is cyclically repeated to achieve continuous production of wheel castings.

Embodiment 1

(9) the number of the gas inlet plugs 5 is 1, one end of the gas inlet plug 5 is provided with an outer thread, and the inner diameter of the gas inlet plug 5 is 8 mm. The gas inlet mark lines 7 are arranged on the gas inlet plug 5, the number of the gas inlet mark lines 7 is 3, the width of each of the gas inlet mark lines 7 is 0.3 mm, the height of each of the gas inlet mark lines 7 is 10 mm, and the gas inlet mark lines 7 are the passages for the inert gas to enter the cavity. The exhausting plug 6 is stepped, the exhausting mark lines 8 are arranged on the exhausting plug 6, the number of the exhausting mark lines 8 is 3, the width of each of the exhausting mark lines 8 is 0.3 mm, the height of each of the exhausting mark lines 8 is 10 mm, the exhausting mark lines 8 are the passages for exhausting air and inert gas out of the cavity, the formation of back pressure in the cavity is avoided, and then smooth mold filling of the molten aluminum is unobstructed.

(10) The ventilating pipeline 4 is configured to be in a single-pipe double-inlet mode so that gas can be evenly led to make the cavity be full of the gas. The ventilating pipeline 4 is in threaded connection with the gas inlet plugs 5. The inert gas is argon gas, and gas pressure is set as 0.6 Mpa.

Embodiment 2

(11) the number of the gas inlet plugs 5 is 2, one end of each of the gas inlet plugs 5 is provided with an outer thread, and the inner diameter of each of the gas inlet plugs 5 is 7 mm. The gas inlet mark lines 7 are arranged on the gas inlet plugs 5, the number of the gas inlet mark lines 7 is 5, the width of each of the gas inlet mark lines 7 is 0.25 mm, the height of each of the gas inlet mark lines 7 is 15 mm, and the gas inlet mark lines 7 are the passages for inert gas to enter the cavity. The exhausting plug 6 is stepped, the exhausting mark lines 8 are arranged on the exhausting plug 6, the number of the exhausting mark lines 8 is 5, the width of each of the exhausting mark lines 8 is 0.25 mm, the height of each of the exhausting mark lines 8 is 20 mm, the exhausting mark lines 8 are the passages for exhausting air and inert gas out of the cavity, the formation of back pressure in the cavity is avoided, and then smooth mold filling of the molten aluminum is unobstructed.

(12) The ventilating pipeline 4 is configured to be in the single-pipe double-inlet mode so that gas can be evenly led to make the cavity be full of the gas; the ventilating pipeline 4 is in welded connection with the gas inlet plugs 5. The inert gas is nitrogen gas, and gas pressure is set as 0.5 Mpa.

Embodiment 3

(13) the number of the gas inlet plugs 5 is 3, one end of each of the gas inlet plugs 5 is provided with an outer thread, and the inner diameter of each of the gas inlet plugs 5 is 5 mm. The gas inlet mark lines 7 are arranged on the gas inlet plugs 5, the number of the gas inlet mark lines 7 is 6, the width of each of the gas inlet mark lines 7 is 0.2 mm, the height of each of the gas inlet mark lines 7 is 20 mm, and the gas inlet mark lines 7 are the passages for inert gas to enter the cavity. The exhausting plug 6 is stepped, the exhausting mark lines 8 are arranged on the exhausting plug 6, the number of the exhausting mark lines 8 is 6, the width of each of the exhausting mark lines 8 is 0.2 mm, the height of each of the exhausting mark lines 8 is 30 mm, the exhausting mark lines 8 are the passages for exhausting air and inert gas out of the cavity, the formation of back pressure in the cavity is avoided, and then smooth mold filling of the molten aluminum is unobstructed.

(14) The ventilating pipeline 4 is configured to be in the single-pipe double-inlet mode so that gas can be evenly led to make the cavity be full of the gas; the ventilating pipeline 4 is in threaded connection with the gas inlet plugs 5. The inert gas is nitrogen gas, and gas pressure is set as 0.2 Mpa.