CN205217975U - Vacuum pump hot chamber machine - Google Patents

Abstract

The utility model relates to a pressure foundry technology field, the utility model discloses a vacuum pump hot chamber machine, including the cover half, the movable mould, press the room, the die cavity of cover half and movable mould closed laminating formation die -casting, die cavity and pressure room are linked together, be connected with the vacuum pump on the cover half, be equipped with the through -hole on the cover half, the through -hole both ends respectively with the vacuum pump, the die cavity is connected, the middle section of through -hole is equipped with the flashboard, the die cavity is through a gooseneck and press the room to communicate with each other, press the room to locate in the crucible, be full of the metal melt water in this crucible, be equipped with liquid suction port on the outer wall of pressure room, this liquid suction port will press room and crucible intercommunication, press the indoor pressure that is equipped with and penetrate the head, the crucible is fixed in a melting furnace, and the below of crucible is equipped with heating device. Adopt this scheme, can will press indoor air to take out completely before die -casting, be favorable to molten metal liquid to be full of the die cavity, avoided the production of bubble simultaneously, improved the quality of foundry goods.

Description

Vacuum Pump Hot Chamber Die Casting Machine

technical field

The utility model relates to the technical field of pressure casting.

Background technique

Die casting (English: diecasting) is a metal casting process characterized by the use of a mold cavity to apply high pressure to molten metal. Molds are usually machined from stronger alloys, a process somewhat similar to injection molding. Most die castings are ferrous, such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys. Depending on the type of die casting, a cold chamber die casting machine or a hot chamber die casting machine is used. Die casting machines can be mainly divided into two different types, hot chamber die casting machines and cold chamber die casting machines. The difference lies in how much force they can withstand. The typical pressure range is between 400 and 4000 kg. The pressure chamber of the hot-press chamber die-casting machine (referred to as the hot-air die-casting machine) is immersed in the liquid metal in the heat-preserving melting crucible, and the injection parts are not directly connected to the machine base, but installed on the crucible. The advantages of this die-casting machine are simple production process, high efficiency, less metal consumption and stable process.

The current hot chamber die-casting machine mainly includes a crucible, an injection head, a pressure chamber, and a mold cavity. The pressure chamber and the mold cavity are connected and sealed. The liquid is sucked into the pressure chamber, and the metal industry is pressed into the mold cavity by the injection head for die casting. However, the movement of the injection head cannot completely remove the air in the pressure chamber and the mold cavity. Air remains in the mold cavity, and the molten metal is likely to form bubbles during the solidification process, resulting in unsatisfactory die-casting effects and poor quality of castings. low quality.

Utility model content

The utility model intends to provide a vacuum pump hot chamber die-casting machine capable of eliminating air bubbles in castings during die-casting.

The vacuum pump hot chamber die-casting machine in this solution includes a fixed mold, a movable mold, and a pressure chamber. The fixed mold and the movable mold are closed and bonded to form a die-casting mold cavity. The mold cavity and the pressure chamber are connected, and the fixed mold is connected. There is a vacuum pump, and a through hole is arranged on the fixed mold, and the two ends of the through hole are respectively connected with the vacuum pump and the mold cavity. In a crucible, the crucible is filled with molten metal, and the outer wall of the pressure chamber is provided with a liquid suction port, which connects the pressure chamber with the crucible. In the furnace, a heating device is provided below the crucible.

Beneficial effects: the crucible is filled with molten metal, before casting, the fixed mold and the movable mold are closed, the injection head blocks the liquid suction port to form a sealed space between the pressure chamber and the mold cavity, and the gate is opened. Turn on the vacuum pump to extract the vacuum, so that the mold cavity and the pressure chamber are in a vacuum state; close the gate, move the injection head up, expose the liquid suction port, connect the crucible and the pressure chamber, and the molten metal flows into the pressure chamber, and in the vacuum negative Under the condition of high pressure, the molten metal will pour into the pressure chamber in large quantities, and may even enter the mold cavity, and then press down the injection head to push the molten metal, so that the cavity is filled with molten metal, and at the same time, under the action of pressure, it solidifies The castings are denser and the quality of the castings is better; throughout the process, the heater below the crucible continues to heat the crucible to ensure that the molten metal in the crucible remains in a good melting state and has stronger fluidity. By adopting this solution, the air in the pressure chamber can be completely drawn out before die casting, which is beneficial for the molten metal liquid to fill the mold cavity, avoids the generation of air bubbles, and improves the quality of the casting.

Further, it also includes a frame, the movable mold is connected with a slide bar, and the slide bar is slidably connected to the frame, and the movable mold can slide on the frame, so that it is more convenient to take out the casting.

Further, the upper end of the injection head is connected with a pressure rod, the pressure rod is sleeved on the frame to slide, and the upper end of the pressure rod is connected to the output end of a hydraulic cylinder, and the frame can have a good guiding effect on the pressure rod, while sliding more fluid.

Further, there are more than two liquid suction ports, increasing the number of liquid suction ports facilitates the rapid entry of melting technology into the pressure chamber and mold cavity, increasing the die-casting efficiency.

Further, the height of the molten metal in the crucible is higher than that of the pressure chamber, so as to prevent the height of the molten metal from being lower than the suction port after a die-casting is completed, because air enters the pressure chamber and the fluidity of the molten metal is weakened.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of a vacuum pump hot chamber die-casting machine of the present invention.

detailed description

The utility model is described in further detail below by means of specific embodiments:

The reference signs in the drawings of the description include: frame 1, crucible 2, heating device 3, injection head 4, pressure rod 41, hydraulic cylinder 42, mold cavity 5, fixed mold 51, movable mold 52, vacuum pump 53, gate plate 54.

Embodiment is shown in Figure 1 basically:

The vacuum pump 53 hot chamber die-casting machine in this scheme comprises a fixed mold 51, a movable mold 52, and a pressure chamber. The fixed mold 51 and the movable mold 52 are closed and bonded to form a mold cavity 5 for die-casting. The mold cavity 5 communicates with the pressure chamber. Die 51 is connected with vacuum pump 53, fixed mold 51 has a through hole, and the two ends of the through hole are connected with vacuum pump 53 and mold cavity 5 respectively, and gate plate 54 is installed in the middle section of the through hole.

The gate plate 54 is slidably installed in the slideway opened on the fixed mold 51 to control the opening and closing of the through hole. The mold cavity 5 communicates with the pressure chamber through a gooseneck, and the pressure chamber is installed in the crucible 2, which is filled with metal Melt liquid, molten metal submerges the crucible 2, there is a liquid suction port on the outer wall of the pressure chamber, and the liquid suction port communicates the pressure chamber with the crucible 2, and the injection head 41 is slidably installed in the pressure chamber, and the upper end of the injection head 41 is connected to There is a pressure rod 41, which is sleeved on the frame 1 and slides. The upper end of the pressure rod 41 is connected to the output end of a hydraulic cylinder 42. The frame 1 can guide the pressure rod 41 well and slide more smoothly. The crucible 2 is fixed in a melting furnace, and a heating device 3 is arranged below the crucible 2, and the heating device 3 is a thermal heater.

The movable mold 52 is connected with a slide bar, and the slide bar is slidably connected on the frame 1, and the movable mold 52 can slide on the frame 1, so that it is more convenient to take out the casting. Die casting is to pay attention to adding molten metal to the crucible 2 in time to ensure that the height of the molten metal in the crucible 2 is higher than the height of the pressure chamber, so as to avoid the height of the molten metal being lower than the suction port after a die-casting is completed, so that the height of the molten metal in the pressure chamber Air enters and the fluidity of the molten metal decreases.

Working principle: The crucible 2 is filled with molten metal. Before casting, the fixed mold 51 and the movable mold 52 are closed, and the injection head 41 blocks the liquid suction port to form a sealed space between the pressure chamber and the mold cavity 5. Open the gate 54, turn on the vacuum pump 53 to extract the vacuum, so that the mold cavity 5 and the pressure chamber are in a vacuum state; close the gate 54, move the injection head 41 up, expose the liquid suction port, connect the crucible 2 and the pressure chamber, and melt The molten metal flows into the pressure chamber, and under the condition of vacuum negative pressure, the molten metal will pour into the pressure chamber in large quantities, and may even enter the mold cavity 5, and then press down the injection head 41 to push the molten metal to make the mold cavity 5 The inside of the crucible is filled with molten metal, and at the same time, under the action of pressure, the solidified casting is denser and the quality of the casting is better; during the whole process, the heater below the crucible 2 continues to heat the crucible 2 to ensure that the molten metal in the crucible 2 remains Good molten state, stronger fluidity.

What is described above is only the embodiment of the utility model, and common knowledge such as the specific structure and characteristic known in the scheme is not described too much here. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the utility model, some deformations and improvements can also be made, and these should also be regarded as the protection scope of the utility model, and these will not affect the utility model. Effects of novel implementations and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (5)

1. A vacuum pump hot chamber die-casting machine, comprising a fixed mold, a movable mold, and a pressure chamber, the fixed mold and the movable mold are closed and bonded to form a mold cavity for die-casting, and the mold cavity and the pressure chamber are connected, and it is characterized in that: the A vacuum pump is connected to the fixed mold, and a through hole is provided on the fixed mold. The two ends of the through hole are respectively connected with the vacuum pump and the mold cavity. The pressure chamber is set in a crucible, the crucible is filled with molten metal, the outer wall of the pressure chamber is provided with a liquid suction port, and the liquid suction port communicates the pressure chamber with the crucible, and the pressure chamber is provided with an injection head, and the crucible It is fixed in a melting furnace, and there is a heating device under the crucible. 2 . The vacuum pump hot chamber die-casting machine according to claim 1 , further comprising a frame, the movable mold is connected with a slide bar, and the slide bar is slidably connected to the frame. 3 . 3. The vacuum pump hot chamber die-casting machine according to claim 2, characterized in that: the upper end of the injection head is connected with a pressure rod, the pressure rod is sleeved on the frame and slides, and the upper end of the pressure rod is connected with the output of a hydraulic cylinder end. 4. The vacuum pump hot chamber die-casting machine according to claim 3, characterized in that there are more than two liquid suction ports. 5. The vacuum pump hot chamber die-casting machine according to claim 4, characterized in that: the height of the molten metal in the crucible is higher than that of the pressure chamber.