JPS5928572A - Impregnation treatment of cast product - Google Patents

Abstract

PURPOSE:To attain to enhance the remedy ratio of a pressure leak product, by a method wherein a cast green product subjected to impregnation treatment due to an inorg. impregnant is heated and dried at a specific temp. in the atmosphere and the impregnated green product is subjected to impregnation treatment by an org. impregnant to be heated at a specific temp in the atmosphere to perform curing treatment. CONSTITUTION:In the impregnation treatment of a cast product, a cast green product is at first impregnated with an inorg. impregnant to be heated and dried at 100 deg.C or below in the atmosphere. In this case, as the inorg. impregnant, one prepared by mixing Fe2O3 particles in water glass is used. In the next step, the impregnated green product is subjected to impregnation treatment using an org. impregnant and gradually heated at 50-100 deg.C in the atmosphere to perform curing. As the org. impregnant, an acrylic anaerobic org. impregnant is used. By this method, the defective ratio of the cast product is reduced and cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for impregnating and treating trivial cavities in cast products such as cast iron and aluminum alloy.

Conventionally, spinning of 67i manufactured products required pressure resistance! 1! As for impregnation treatment, it has been common practice to use an inorganic impregnating agent containing water glass or the like as a main component for raw casting material. However, after the impregnation process, new J holes often appear on the machined surface. No 1
The impregnating agent adheres to the machined surface, worsening dimensional accuracy, and adheres to the threaded part, preventing the screw from tightening or covering it, resulting in flashing during use. On the other hand, there is a method of applying a stone-based impregnating agent and curing it by heating it in water, but this method does not cause any dimensional change after processing and does not have the above-mentioned problems, but it reduces cost 1. It is unsuitable for impregnating rough materials because of its high cost.

Therefore, it is possible to impregnate the raw materials with an IUN-based impregnating agent, and re-process only the leaked items after mechanical processing with a stone-based impregnating agent, The method of performing an impregnating treatment in hot water on the impregnating agent does not provide a good repair rate for defective products with pressure leakage.

An object of the present invention is to improve the recovery rate of leaking products in a method of impregnating with an inorganic impregnant and then impregnating with an organic impregnant.

In order to achieve this objective, in the casting impregnation method of the present invention, the cast material impregnated with an inorganic impregnating agent is heated and dried in the atmosphere at 100°C or less, and then Impregnated with an impregnating agent and heated to 50℃ after impregnation
The material is gradually heated to 100°C to 100°C in the atmosphere for hardening. In such an impregnation treatment method, heating is performed after impregnation with an inorganic impregnating agent, so that the water of crystallization in the water glass evaporates, and the organic impregnating agent applied thereafter is quickly assimilated. Moreover, since the curing treatment after impregnation with the organic impregnating agent is also carried out in the atmosphere at 50°C to 100°C, the influence of water contained in the 1-based impregnating agent can be further minimized. Moreover, since the organic impregnating agent is cured in the atmosphere, the inorganic impregnating agent does not dissolve into the product water (as in the conventional curing process in hot water). Through these combined actions, the quality of the 4 holes and 9 holes in the rough casting material is improved by 1q, and therefore the high relief rate of leakage products after l>11 hole machining is achieved, and the purpose of JIJI is achieved. It will be achieved.

A preferred practical example of the impregnation treatment method of the present invention will be described below, in the case where it is applied to the impregnation treatment of an index manifold of an engine for a JIsen car.

Heat JIS l,'; i grade A02B aluminum alloy (Note) 9 into a mold and make the raw material for an intake manifold of an automobile engine. When a pressure leakage test was conducted by submerging the raw cast material in water and applying an air pressure of +1/cf to the intake manifold, it showed a pressure leakage rate of 5Q%. The leaking product was impregnated with water glass using a conventional treatment method using a mixture of e2o3 fine particles and two agents. After that, a pressure leak test was conducted again in the same manner, and 596 pressure leaks occurred among the machined products.

Of these 596 pressure leaking products, the air leakage m was 30Qcc.
/ minute or less was impregnated with an organic impregnating agent such as Gigi. In addition, products that leak air at a rate of 300 cc/min or more after crushing the cast raw materials are not eligible for rescue, as the cavities are too large to be used as products for the intake 5 manifold. And so.

The product with pressure leakage was heated and dried in the air at 50°C for 1 hour.
After that, it was impregnated with an anaerobic acrylic organic impregnation agent. After washing the product impregnated with this organic impregnating agent,
/ 30 minutes of heating and cooling rate to 60℃ in the atmosphere, 6
The sample was kept at 0° C. for 30 minutes, and the organic impregnation agent was cured.

After the hardening treatment, the treated products were tested for pressure leakage again, and all of the treated products passed the standard, with a recovery rate of 1.0% for pressure leakage defective products.

The figure shows the relief rate of leaking products by the treatment method of the present invention in comparison with the relief rate of treatments performed under other conditions. In the figure, method A is the result of a pressure leakage test after machining R rough material.
The treatment method of the present invention is applied to products with pressure leaks of 0 cc7 minutes or more, and method B is used for right σ・! Method C is for drying at 100°C or higher before impregnation with an organic impregnating agent, method C is for curing treatment after impregnation with an organic-based impregnant, and method D is for pressure leakage. However, 300001
The treatment method of the present invention was applied to a product with a pressure leakage of less than 100 yen.

In method A, since there is a large ＜+＞ distribution in the non-rich areas, the relief rate is approximately 30% even if impregnated with an organic impregnating agent.
% was low. These human nests are I! j
As a G defective product, the right (means it is not subject to flame-based refining treatment).

Method B has one;! In order to shorten the drying time before impregnating with the turtle-based impregnating agent, the drying temperature was carried out at a high temperature of 100" or higher. This drying was performed by applying an organic impregnating agent to the water glass-impregnated material. If impregnated, the curing time of the organic impregnating agent will be longer due to the water contained in the water glass as crystal water, and the organic impregnating agent will not solidify sufficiently. When the temperature exceeds 100° C., the n-free impregnating agent separates and the treatment effect of the inorganic impregnating agent is impaired.

Therefore, even if the area near the surface is impregnated with a good 1;1 type impregnating agent, the sealing effect of the internal 1; The rescue rate was

In method C, during the curing treatment of the rlI-based impregnating agent,
Since water glass dissolves in hot water, the treatment effect of non-n-based impregnating agents decreases, and the overall effect decreases.
The relief rate was 5%.

In contrast to methods Δ, B, and C, in method D of the present invention, drying is performed at 100'C or less before impregnation with the phlegm-based impregnation agent.
The n-free impregnating agent does not crack due to the high temperature, and it is also suitable for use with the right l, '3. The hardening process after impregnating with the carbon-based impregnant is carried out at a temperature of 50°C or higher, at which the carbon-based impregnant solidifies, and at a temperature of 100°C or lower, where there is no risk of incineration of the carbon-based impregnant.
'In other words, since the process is carried out at an appropriate temperature in the range of 50°C to 100°C, good pore sealing can be achieved, and since it is carried out in the atmosphere, the inorganic impregnant is free from tWL as in method C. N-based impregnating agents do not cause a decrease in sealing effectiveness. As a result, in J3, the 100% relief rate for treated items is 11'? It's rare.

To summarize the above, when using the impregnation treatment method for EZ manufactured products of the present invention, casting rough material impregnated with an n-free impregnation agent is
By heating and drying at a temperature below 0°C, the self-infiltration of the σ1-based impregnant was made possible, and the curing process was carried out in the air at 50°C to 100°C. Although it is expensive, it has a good relief rate (f1
It is possible to reduce the impregnation treatment with π-based agents by 2 tlli, and this combination treatment has the effect of achieving a low defect rate of manufactured products, and a reduction in L13 and varnish 1-.
7.

[Brief explanation of the drawing]

The figure is a comparison diagram of the pressure leakage relief skewer obtained by the method of the present invention and another method.

Claims (4)

[Claims] (1)1! Impregnating the rough material with an inorganic impregnating agent, 111
Impregnation of a cast product characterized by: heating and drying in the atmosphere at 00°C or lower, then impregnating with an organic impregnating agent, and after impregnation, gradually heating to 50°C to 100°C for hardening treatment. Processing method. (2) The method for impregnating a cast article according to claim 1, wherein the inorganic impregnating agent is a mixture of water glass and Fe2O3 particles. (3) The method for impregnating a cast article according to claim 1, wherein an acrylic anaerobic organic impregnant is used as the organic impregnant. (4) The method for impregnating a cast article according to claim 1, wherein the heat curing treatment after impregnation with the organic impregnant is carried out in the atmosphere.