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Oxygenating-vacuum die casting die device and oxygenating-vacuum die casting process

A vacuum die-casting and mold technology, applied in oxygenation-vacuum die-casting process, oxygenation-vacuum die-casting mold device field

Active Publication Date: 2014-07-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Another object of the present invention is to propose a new die-casting process to reduce the porosity content in die-castings and solve the problems faced by existing die-casting processes

Method used

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  • Oxygenating-vacuum die casting die device and oxygenating-vacuum die casting process
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  • Oxygenating-vacuum die casting die device and oxygenating-vacuum die casting process

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Example 1 Oxygenation-vacuum die casting, the first predetermined speed (ie slow injection speed) is 0.1 m / s.

[0051] A Toyo 350-ton cold chamber die-casting machine is used, and an oxygen charging tube 7 and a vacuum tube 9 are connected to the top of the vacuum valve 12 to carry out oxygen charging and vacuuming operations respectively. Solenoid valves are respectively installed on the oxygen charging tube 7 and vacuum tube 9 to control the charging respectively. Oxygen and vacuum on and off. The sheet-shaped die-casting mold is adopted, and the die-casting material selected is AZ91D magnesium alloy.

[0052] The specific steps are as follows: the mold is preheated to 180°C, and the first valve 8 on the oxygenation pipe 7 is opened to start oxygenation during the mold closing process. After the mold is closed, molten metal with a temperature of 680°C is added from the sprue 5. After the feeding is completed, the punch 6 is pressed in at a slow injection speed of 0.1...

Embodiment 2

[0054] Example 2 Oxygenation-vacuum die-casting, the first predetermined speed (ie slow injection speed) is 0.2m / s, the experimental device and experimental materials are the same as in Example 1.

[0055] The specific steps are as follows: the mold is preheated to 180°C, and the first valve 8 on the oxygenation pipe 7 is opened to start oxygenation during the mold closing process. After the mold is closed, molten metal with a temperature of 680°C is added from the sprue 5. After the feeding is completed, the punch 6 is pressed in at a slow injection speed of 0.2m / s. When the punch 6 closes the gate 5, the first valve 8 of the oxygenation tube 7 is closed and the second valve 10 of the vacuum tube 9 is opened. Oxygenation was stopped and vacuum started. The punch 6 advances to the 245mm in the pressure chamber 4, the vacuum pressure of the cavity 1 is 37.2kPa, and the punch 6 starts to be pressed in at a fast injection speed of 5m / s. After filling the mold, close the second v...

Embodiment 3

[0057] Example 3 Oxygenation-vacuum die-casting, the first predetermined speed (ie slow injection speed) is 0.3m / s, and the experimental device and experimental materials are the same as those in Example 1.

[0058] The specific steps are as follows: the mold is preheated to 180°C, and the first valve 8 on the oxygenation pipe 7 is opened to start oxygenation during the mold closing process. After the mold is closed, molten metal with a temperature of 680°C is added from the sprue 5. After the feeding is completed, the punch 6 is pressed in at a slow injection speed of 0.3m / s. When the punch 6 closes the gate 5, the first valve 8 of the oxygenation tube 7 is closed and the second valve 10 of the vacuum tube 9 is opened. Oxygenation was stopped and vacuum started. The punch 6 travels to the 245mm in the pressure chamber 4, the vacuum pressure of the cavity 1 is 57.2kPa, and the punch 6 starts to be pressed in at a fast injection speed of 5m / s. After filling the mold, close the...

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Abstract

The invention provides an oxygenating-vacuum die casting die device and an oxygenating-vacuum die casting process. The oxygenating-vacuum die casting process comprises the following steps that die assembling is carried out, and a mold cavity and a pressure chamber are continuously oxygenated; after die assembling is completed, molten metal is injected into the pressure chamber from a casting material opening; after liquid injection is completed, a puncher pin is pressed into the pressure chamber at first preset speed and seals the casting material opening, the mold cavity and the pressure chamber are stopped from being oxygenated, and the mold cavity and the pressure chamber are vacuumized; when the puncher pin moves to the preset position in the pressure chamber at the first preset speed, the puncher pin continues to be pressed into the pressure chamber at second preset speed, and the mold filling process is started; after mold filling is completed, vacuumizing is stopped, and a casting is taken out after being cooled. According to the oxygenating-vacuum die casting process, the limit that a vacuum die casting process has high requirements for the vacuum degree of the mold cavity is overcome, and meanwhile the problem that a large amount of heat is released when an oxygenating die casting process is independently used is solved.

Description

technical field [0001] The invention relates to the technical field of die-casting, in particular to an oxygenation-vacuum die-casting mold device and an oxygenation-vacuum die-casting process. Background technique [0002] Vacuum die casting and oxygenated die casting are two commonly used die casting processes to reduce the porosity content in die castings. [0003] Vacuum die-casting is the process of high-pressure casting, the air in the pressure chamber and the mold cavity is extracted through the vacuum device, and the air pressure in the mold cavity is reduced when the mold is filled. Compared with the conventional die-casting process, the vacuum die-casting process can reduce the porosity content of the casting, thereby improving the mechanical properties, heat treatment performance and welding performance of the casting. [0004] Oxygen-filled die-casting is to pre-fill oxygen in the pressure chamber and cavity before high-pressure casting to replace the air and ot...

Claims

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Application Information

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IPC IPC(8): B22D17/00B22D17/14
Inventor 熊守美王青亮
Owner TSINGHUA UNIV
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