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Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle

A technology of hydroelectric effect, high temperature and high pressure, applied in the field of investment precision casting ceramic core removal process and its device, to achieve the effects of simple equipment, simple process and high removal efficiency

Inactive Publication Date: 2013-01-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the application of hydroelectric effect to the removal process of ceramic cores.

Method used

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  • Process for accelerating core removal speed by utilizing liquid-electric effect and special high-temperature high-pressure core removal kettle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 1 , in this embodiment, a corrosive liquid pool 4 is provided in the hydroelectric effect high temperature and high pressure core removal kettle, and the casting 3 to be removed from the core is loaded in the material frame 2, so that the casting 3 loaded in the material frame 2 is completely immersed in the corrosive liquid In the pool 4, an electrode 1 is arranged above the casting 3, and the bottom end of the electrode 1 is also immersed in the corrosion solution pool 4. The electrode 1 is not in contact with the casting 3 loaded in the material frame 2, and the top of the electrode 1 is connected to a high-voltage pulse power supply 5 , the corrosive liquid pool 4 is grounded, and the high-voltage pulse power supply 5 is controlled to continuously apply high-voltage pulse current to the corrosive liquid pool 4. Under the set temperature and pressure environment, the liquid corrosive medium in the corrosive liquid pool 4 is rapidly Vaporization, expansion,...

Embodiment 2

[0021] This embodiment is basically the same as Embodiment 1, especially in that:

[0022] In this embodiment, the casting containing the aluminum-based ceramic core is put into the material frame 2, and put together into the corrosion solution pool 4 of the high-temperature and high-pressure core removal kettle, and the alkaline solution is 25% NaOH aqueous solution. Also arrange the electrode 1 directly above the casting 3, cover the high-temperature and high-pressure core removal kettle, and heat it with electricity until the temperature rises to 200 degrees Celsius and the pressure reaches 0.7 MPa. After holding the heat for 1 hour, turn on the high-voltage pulse power supply 5, Apply a high-voltage pulse current for 10 minutes every half hour, three times in a row, to produce a hydroelectric effect, and use the shock wave and cavitation effects of the electrohydraulic effect to promote the corrosion products after corrosion to flow out of the inner cavity of the casting to...

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Abstract

The invention discloses a process for accelerating a core removal speed by utilizing a liquid-electric effect. A corrosion removal process of a mold core of a cast part and a washing process of an inner cavity of the cast part are proceeded at the same time, namely, under a set temperature and pressure environment, a high-voltage pulse current is applied to a liquid corrosion medium without interruption at intervals, the liquid corrosion medium is quickly vaporized or expanded or generate a shock wave or a cavity by the liquid-electric effect, the mold core of the cast part is carried out chemical corrosion reaction and physical erosion, a corroded product flows out of a mold cavity of the cast part, and a new mold core corrosion interface of the cast part is formed in the mold cavity of the cast part without interruption so as to accelerate the removal speed of the mold core of the cast part. The invention further discloses a high-temperature high-pressure core removal kettle with the liquid-electric effect. An electrode is arranged above the cast part; a bottom end of the electrode is also soaked in a corrosion liquid pool; the electrode is not in contact with the cast part loaded in a material frame; a top end of the electrode is connected with a high-voltage pulse power supply; the corrosion liquid pool is grounded; and the high-voltage pulse power supply is controlled to apply the high-voltage pulse current to the corrosion liquid pool without interruption at intervals.

Description

technical field [0001] The invention relates to a process and a device for removing a ceramic core of investment casting precision casting, in particular to a process and a device for removing a ceramic core at high temperature and high pressure. Background technique [0002] With the development of investment casting technology, a large number of castings with complex shapes of inner cavities appear. However, a large number of complex inner cavities need to be formed with cores. The cores are divided into sand cores and ceramic cores. The strength of sand cores is low. Formation The surface roughness of the inner cavity of the casting is relatively large, but the sand core can be removed by mechanical vibration, which is currently only used in large sand castings. Ceramic cores are used in a large number of small castings with high requirements on the inner surface of the cavity, especially the hollow blades of the engine. The ceramic core has high strength and good corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D29/00
Inventor 余建波任忠鸣邓康李霞
Owner SHANGHAI UNIV
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