Aluminum alloy low-pressure casting device and process

Abstract

The present application discloses an aluminum alloy low-pressure casting device and an aluminum alloy low-pressure casting process. A riser tube is canceled, and the pressure kettle replaces original injection of compressed air into a holding furnace, thereby reducing the consumption of compressed air, and improving the production efficiency of the low-pressure casting process. A non-return stopper is used to space the low-pressure casting and the holding furnace, and molten aluminum alloy can be added into the holding furnace in real time without interrupting the low-pressure casting process, so that rejects affected by temperature field changes due to interrupt of the continuous casting process can be reduced, and the yield of the casting process is improved.

Claims

1. An aluminum alloy low-pressure casting device, wherein that a non-return stopper arranged on a diversion trench spaces a low-pressure casting main machine from a holding furnace, the non-return stopper and the diversion trench are arranged in plunger-type tapered fit, the non-return stopper is fitted with the diversion trench through an oblique tapered surface, and a tapered angle of the non-return stopper is between 0 and 3; a center plunger is required to close a cavity of a mold before the non-return stopper is opened; the center plunger closes the mold in tapered fit, and a tapered angle of the center plunger is between 0 and 5; a liquid level detection device B is arranged in a pressure kettle to limit a upper limit of a liquid level of the pressure kettle, and a liquid level detection device C is arranged in the pressure kettle to limit a lower limit of the liquid level of the pressure kettle; a liquid level detection device A is arranged at the lower part of the mold, and a position of the liquid level detection device A and a position of the liquid level detection device C are flush.

2. The aluminum alloy low-pressure casting device according to claim 1, wherein that the non-return stopper is fitted with the diversion trench through the oblique tapered surface, and the tapered angle of the non-return stopper is between 0.5 and 3; the center plunger closes the mold in tapered fit, and the tapered angle of the center plunger is between 0.5 and 5.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic diagram of device in an aluminum alloy low-pressure casting process according to the present application.

(2) In figures: 1casting main machine, 2mold, 3diversion trench, 4liquid level detection device A, 5pressure kettle, 6liquid level detection device B, 7liquid level detection device C, 8non-return stopper, 9holding furnace, 10holding furnace inlet, 11center plunger.

DETAILED DESCRIPTION OF THE INVENTION

(3) An aluminum alloy low-pressure casting process comprises the steps of opening a non-return stopper 8 after a mold 2 is closed, injecting molten aluminum alloy into a holding furnace 9 through a diversion trench 3, closing the non-return stopper 8 after the molten aluminum alloy in a pressure kettle 5 reaches an upper limit of the liquid level, opening a center plunger 11 at the same time, injecting compressed air into the pressure kettle 5 to implement a filling mold and holding process of low-pressure casting, unloading the pressure in the pressure kettle and evacuating the compressed air after a casting in the cavity of the mold is completely solidified, opening the mold to take the casting out, thus completing the entire low-pressure casting process.

(4) According to a low-pressure casting device, including casting main machine 1, mold 2, diversion trench 3, liquid level detection device A 4, pressure kettle 5, liquid level detection device B 6, liquid level detection device C 7, non-return stopper 8, holding furnace 9, holding furnace inlet 10, center plunger 11, a non-return stopper 8 arranged on a diversion trench 3 spaces a low-pressure casting main machine 1 from a holding furnace 9 to add molten aluminum alloy into the holding furnace 9 continuously. When the non-return stopper 8 is opened, the molten aluminum alloy in the holding furnace 9 flows into the diversion trench 3 for casting. When the non-return stopper is closed, the molten aluminum alloy inside the low-pressure casting device is closed to implement the low-pressure casting process.

(5) In order to close the molten aluminum alloy in the diversion trench under the pressure of compressed air, the non-return stopper 8 and the diversion trench 3 are arranged in plunger-type tapered fit. The non-return stopper 8 is fitted with the diversion trench 3 through an oblique tapered surface, and the tapered angle is between 0.5 and 3.

(6) According to the low-pressure casting device of the present application, a center plunger 11 is required to close the cavity of the mold before the non-return stopper 8 is opened, to ensure that the molten aluminum alloy is smoothly injected into the designated liquid level in the pressure kettle 5 rather than flowing into the cavity of the mold in advance.

(7) The center plunger 11 of the present application closes the mold in tapered fit, and the tapered angle is between 0.5 and 5.

(8) According to the low-pressure casting device of the present application, a liquid level detection device B 6 is arranged in the pressure kettle 5 to limit the upper limit of the liquid level of the pressure kettle, and a liquid level detection device C 7 is arranged in the pressure kettle to limit the lower limit of the liquid level of the pressure kettle. The upper limit is calculated from the weight of a casting and the amount of molten aluminum alloy to be fed, and the lower limit is flush with the liquid level detection position of a center sprue at the lower part of the mold.

(9) The foregoing descriptions of specific exemplary embodiments of the present application 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.