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A method for repairing gaps in castings

A technology for castings and gaps, which is applied to casting equipment, metal processing equipment, manufacturing tools, etc., and can solve problems such as deep holes and tiny pores that cannot be repaired

Active Publication Date: 2017-11-24
遵义金业机械铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing method for repairing pores in castings has the defect of being unable to repair deep pores and tiny pores.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for repairing gaps in castings of the present invention comprises the following steps:

[0017] The first step, the preparation stage, puts the casting to be repaired into a sealed device that can be vacuumed;

[0018] The second step is to vacuumize the airtight equipment to -0.08MP;

[0019] The third step is to inject water-soluble sodium silicate as a repair solution and diffuse in the equipment for at least 30 minutes;

[0020] The fourth step, under the action of the booster pump, pressurize until the sealed equipment presses out the repair fluid;

[0021] The fifth step is to repeatedly flush the casting by increasing and decreasing the pressure of the airtight device, sucking in and pressing out the water in the airtight device;

[0022] The sixth step is repairing, vacuuming again, and then introducing carbon dioxide gas to react with the repairing fluid penetrating into the casting to finally generate silicon dioxide to complete the repair.

Embodiment 2

[0024] A method for repairing gaps in castings of the present invention comprises the following steps:

[0025] The first step, the preparation stage, puts the casting to be repaired into a sealed device that can be vacuumed;

[0026] The second step is to evacuate the airtight equipment to -0.09MP;

[0027] The third step is to inject water-soluble sodium silicate as a repair solution and diffuse in the equipment for at least 30 minutes;

[0028] The fourth step, under the action of the booster pump, pressurize until the sealed equipment presses out the repair fluid;

[0029] The fifth step is to repeatedly flush the casting by increasing and decreasing the pressure of the airtight device, sucking in and pressing out the water in the airtight device;

[0030] The sixth step is repairing, vacuuming again, and then introducing carbon dioxide gas to react with the repairing fluid penetrating into the casting to finally generate silicon dioxide to complete the repair.

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Abstract

The invention discloses a method for repairing gaps in castings. Vacuum diffusion is used to allow the repairing fluid to enter the deep holes and tiny pores of the casting, and carbon dioxide is used to react with it to generate retained silicon dioxide for filling and repairing. Vacuuming is carried out before the water-soluble sodium silicate repair fluid is introduced to double the diffusion speed of its molecules, which will greatly reduce the diffusion time. At the same time, the number of air molecules in this vacuum state is close to zero, and the voids inside the casting are in a vacuum suction state. The water-soluble sodium silicate can quickly and completely fill the deep pores and tiny pores inside the casting. Before the carbon dioxide gas is introduced, the vacuum is drawn again, and the carbon dioxide and the water-soluble sodium silicate fully react in the airtight container, and finally the silicon dioxide is formed and stays in the pores of the casting to achieve the effect of hardening and repairing.

Description

technical field [0001] The invention relates to the field of casting repair, in particular to a casting gap repair method. Background technique [0002] At present, known casting repairs include welding repairs, rubber repairs, etc. Welding repair is to repair the surface of the casting by means of high-temperature melting metal produced by electric welding or oxyacetylene flame, which will generate thermal pressure, and the fatigue strength of the repaired part will become lower; glue repair is to apply casting repair on the surface of the casting The glue, through the reaction and hardening of the binary glue within a certain period of time after mixing, achieves the purpose of repairing. Above-mentioned two kinds of methods can only mend the shallow hole of casting surface, even if the deep hole of casting surface has been repaired, its inside is still hollow, and the intensity of its casting itself has not obtained any strengthening. It is even more helpless for tiny p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D45/00
Inventor 陈天杰苏黎
Owner 遵义金业机械铸造有限公司
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