JPH11179521A - Aluminizing treatment and cast-in method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminizing treatment method and a cast-in method, with which the take-out of a metallic material to be treated from a holding tool is easily executed and the metallic material to be treated can precisely and easily be held in a mold. SOLUTION: Masking agent having low wettability to an aluminum alloy 4 is coated on a portion which holds the metallic material 1 to be treated with the holding tool 2 and on a portion, at which the metallic material to be treated is held in the mold. Thereafter, the metallic material 1 to be treated is held with the holding tool 2, and dipped into the molten aluminum alloy to execute the aluminizing. finally, the metallic material 1 to be treated is held in the mold and the molten aluminum alloy 4 is filled up in the mold to execute the cast-in into the metallic material 1 to be treated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminizing method and a casting method, and more particularly to a method for casting a metal material to be processed with an aluminum alloy by aluminizing the surface of the metal material to be processed. Aluminizing treatment method to promote fusion bonding between material and aluminum alloy,
And a casting method using the aluminizing method.

[0002]

2. Description of the Related Art When a metal material to be treated such as iron is cast with an aluminum alloy, the material to be treated is bonded to the aluminum alloy before casting to increase the bonding strength between the metal to be treated and the aluminum alloy. Conventionally, aluminizing treatment is performed on the surface of a metal material.

For example, a metal material to be processed which has not been subjected to a special surface treatment is held by a holder, and the metal material to be processed held by the holder is immersed in molten aluminum or aluminum alloy, and then melted. The surface of the metal material to be processed is aluminized by taking out the metal material to be processed held by the holder from an aluminum alloy or the like.

Then, the aluminized metal material to be processed is separated from the holder, the metal material to be processed is held at a predetermined position in the mold, and the molten aluminum alloy is poured into the mold to cover the aluminum alloy. Casting in for processed metal material,
A product in which the metal material to be treated and the aluminum alloy are integrated is obtained.

[0005]

However, in the conventional aluminizing treatment method, when the metal material to be processed is immersed in the molten aluminum or aluminum alloy melt and the metal material to be processed is taken out of the molten metal, The aluminum or aluminum alloy adheres to the part where the holder holds the metal material to be processed and solidifies, which exerts an adhesive effect, and the metal material to be processed cannot be removed from the holder. Often had occurred.

Further, when the metal material to be treated, which has been aluminized for casting, is held in the mold, the aluminum alloy at the time of the aluminization treatment also adheres to the portion where the metal material to be treated is held in the mold. Therefore, the aluminum alloy adhered between the metal material to be processed and the holding part in the mold became an obstacle, and the metal material to be processed could not be inserted into the predetermined holding part in the intended mold in advance. . Even if it can be inserted, it cannot be held at a predetermined position of the holding portion in the mold with high accuracy due to the adhered aluminum alloy, which hinders product accuracy.

Therefore, the present invention makes it very easy to remove a material to be processed from a holder, and to insert and hold a metal material to be processed in a mold with high precision. It is an object of the present invention to provide an aluminizing treatment method and a cast-in method capable of casting a product.

[0008]

In order to achieve the above object, according to the present invention, a metal material to be processed 1 is held by a holder 2, and the metal material 1 to be processed held by the holder 2 is melted. In the aluminized aluminum or aluminum alloy molten metal 4, the metal material 1 held in the holder 2 is taken out from the molten metal 4, and the surface of the metal material 1 is aluminized. Before immersing the metal material 1 to be treated in the molten metal 4, a masking agent 6 having low wettability with respect to the molten metal 4 is applied to at least a portion where the metal material 1 to be processed is held by the holder 2. An aluminizing treatment method including a step of applying and drying the masking agent 6 is provided.

According to the present invention, the metal member to be processed 1 is
The metal material 1 held by the holder 2 is immersed in a molten aluminum or aluminum alloy melt 4, and the metal material 1 held by the holder 2 is separated from the molten metal 4. The metal material 1 to be treated is taken out, the surface of the metal material 1 to be treated is aluminized, the aluminized metal material 1 to be treated is held in a mold 5, and the molten aluminum alloy 7 is poured into the mold 5 and In the assembling method for fusing and bonding the treated metal material 1 and the aluminum alloy 7, at least the treated metal material 1 is immersed in the molten metal 4 before being immersed in the molten metal 4 for aluminizing treatment. A masking agent 6 having low wettability with respect to the molten metal 4 is applied to a portion held by the holder 2 and a portion where the metal material 1 to be processed is held in the mold 5, and the masking is performed. Having a step of drying agent 6 It provides a casting-method.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An aluminizing method and a cast-in method according to an embodiment of the present invention will be described with reference to FIGS.

The metal material 1 to be treated is an annular iron-based member,
A belt hanging portion 1A forming a V-groove portion and a mold held portion 1
B and a substantially Y-shaped section having a mating portion 1C.
The specific material of the metal material 1 to be processed is JIS-SPCC.

The metal material to be processed 1 is held by a holder 2. The holder 2 has a grip 2A and a holder 2B, and the holder 2B has an arc-shaped portion that can be fitted into the V-groove shape of the belt hook 1A. As shown in FIG.
While being held by the holder 2, the molten aluminum or aluminum alloy 4 in the molten metal holding furnace 3.
By being immersed in the inside, an aluminizing treatment is performed.

Before dipping, a masking agent 6 is applied to the surface of the holder contacting portion 1a of the metal material 1 to be contacted with the holder 2 and the surface of the holder 1B held in the holding hole 5a of the mold 5. You. First, the metal material 1 to be processed is heated to 80 ° C., and the holder contact portion 1, which is a contact portion between the metal material 1 to be processed and the holder 2, is heated.
A masking process is performed on the mold holding portion 1B, which is a portion where a, 1a, its peripheral portion, and the metal material 1 to be processed are held in a mold 5 described later. This masking process is performed by applying a masking agent 6 and drying. The composition of the masking agent 6 used is 30% of graphite, 5% of sodium silicate and 65% of water. It does not sublime or burn even when immersed in a high-temperature molten aluminum alloy 4 and has high heat resistance. In addition, it has a property of low wettability to the aluminum alloy 4 so that the molten aluminum alloy 4 does not easily adhere.

After this masking process, as shown in FIG. 1, the metal material 1 to be processed is held by the holder 2 and subjected to an aluminizing process. In this aluminizing treatment, the metal material 1 to be treated held by the holder 2 is placed in an aluminum alloy 4 composed of aluminum and silicon melted while being held at a high temperature of 740 ° C.
This is performed by dipping for 0 second, and then the metal material 1 to be treated is taken out of the molten aluminum alloy 4 by the holder 2.
It is taken out while being held in.

When the metal material 1 to be processed is taken out of the molten aluminum alloy 4, the masking agent 6 is previously applied to the holder contact portion 1 a and its peripheral portion. Low masking agent 6
Therefore, the molten aluminum alloy 4 does not adhere to the portion where the masking agent 6 is applied. Therefore, the aluminum alloy 4 adheres between the metal material 1 to be processed and the holder 2 and has an effect like an adhesive, which is a conventional problem, and the metal material 1 to be processed cannot be removed from the holder 2. Can be avoided.

Since the metal material 1 to be processed can be very easily removed from the holder 2 after the aluminizing treatment, the enormous amount of labor, power, work process and work time conventionally required for this work are greatly reduced. It is possible to reduce the number. In addition, the metal material 1 to be processed which has been subjected to the masking process
The portion in contact with the holder 2 and its peripheral portion are belt winding portions for transmitting power when cast and manufactured as a pulley, and are portions that become hot due to high-speed sliding with the belt. is there. Since the aluminum alloy 4 is inferior to iron in terms of heat resistance, the aluminum alloy 4 in the belt winding portion must be removed in the process of manufacturing the pulley. Since the alloy 4 is not attached, the work process for removing the aluminum alloy 4 is also unnecessary,
Since waste and recovery work of the aluminum alloy 4 are not required, it greatly contributes to the manufacture of low-cost products.

Next, as shown in FIG. 3, the metal material 1 subjected to the aluminizing treatment is held inside the mold 5. A holding hole 5a for holding the metal material 1 to be processed is formed in the mold 5 in advance, and the metal material 1 to be processed is inserted by inserting the mold holding portion 1B of the metal material 1 into the holding hole 5a. 1 is set at a predetermined position in the mold 5. Here, since the masking agent 6 was also applied to the mold holding portion 1B, the aluminum alloy 4 at the time of the aluminizing treatment did not adhere and solidify to the mold holding portion 1B. It can be set accurately at a predetermined position on the mold.
In particular, the thickness of the layer of the masking agent 6 formed on the surface of the metal material 1 to be processed by the masking process can be kept constant by intentionally making the application amount of the masking agent 6 constant. It is also easy to grasp the thickness. Therefore, the mold size can be determined in advance in consideration of the thickness of the layer of the masking agent 6, and the metal material 1 to be processed can be held in the mold with extremely high dimensional accuracy.

Next, a JIS-AC4C aluminum alloy 7 is filled into the mold 5 holding the metal material 1 to be processed by weight casting, and the aluminum alloy 7 is fusion bonded to the inner peripheral portion of the metal material 1 to be processed. The cast-in product is cast. Since the metal material 1 to be processed is held in the mold 5 with extremely high dimensional accuracy, a cast-in product can be cast with high accuracy.

When a rotating body is manufactured according to the present embodiment, eccentricity can be corrected to an extremely small level as compared with a conventional method in which no masking processing is performed.
FIG. 4 shows a double pulley 10 showing an example thereof. The total weight of the product is 6 kg, and the outer diameter d of the large-diameter first pulley 11
1 is 250 mm, and the outer diameter d3 of the small diameter second pulley 12 is 2
And the inner diameter d2 of the first and second pulleys is 130 mm.
mm. The axial length L1 of the first pulley 11 was 25 mm, and the overall axial length L2 was 110 mm. Also, the inner diameter d of the coupling portion 13 with the rotating shaft (not shown)
4 was 60 mm. Furthermore, the weight of the belt hook 11A of the first pulley 11 is 0.9 kg, and the second pulley 12
Of the belt hanging portion 12A was 1.4 kg. The belt hooking portion 12A of the second pulley 12 is configured so that a double belt can be hooked.

In the conventional method without masking treatment, the weight of the balance (not shown) required for correcting the eccentricity of the stuffed product of this shape was 170 g. In the case of inserts cast by the method, the weight of the balance required to correct the eccentricity may be only 20 g, which can be less than one-eighth of conventional ones. Accordingly, it has been found that the metal material 1 to be processed is accurately held inside the mold 5 with extremely high precision as compared with the related art, and as a result, a high-precision cast-in product can be manufactured.

The method of assembling according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the composition of the masking agent used in the masking treatment is not limited to the above-described ones, and those having high heat resistance that can withstand aluminizing treatment and casting, and aluminum alloy and the like having low wettability to aluminum and aluminum alloy. Any material that does not adhere may be used. Instead of or in addition to applying the masking agent to a predetermined portion of the non-treated metal material, the masking agent may be applied to a portion of the holder that holds the non-treated metal material.

[0022]

According to the aluminizing treatment method of the present invention, at least the portion of the metal material to be processed held by the holder and its surrounding portion are mixed with aluminum or an aluminum alloy before the aluminizing process is performed. Since a masking agent having low wettability is applied, aluminum or an aluminum alloy does not adhere to the contact portion between the holder and the metal material to be processed after the aluminizing treatment and the peripheral portion thereof. There is no adhesive bonding by an alloy or the like. Therefore, the metal material to be processed can be very easily removed from the holder. Since the metal material to be processed can be removed very easily from the holder, the labor required for removal conventionally required,
Time and the like can be greatly saved. In particular, when performing aluminizing treatment on a high-precision rotating body using the aluminizing treatment method according to the present invention, the force that has conventionally been applied when removing the metal material to be treated from the holder is unnecessary, so that the force is used. It is possible to manufacture a highly accurate aluminizing-processed product without deformation or damage of the metal material to be processed.

According to the method of the present invention, aluminizing treatment is performed on the portion of the metal material to be processed held by the holder and its surroundings and the portion of the metal material to be processed held by the mold. Before applying a masking agent with low wettability with aluminum or aluminum alloy, when the metal material to be treated is inserted and held in the mold,
The aluminum alloy does not adhere to the holding portion in the mold, which is the contact portion between the mold and the metal material to be processed, and the metal material to be processed is easily and accurately inserted into the intended predetermined position in the mold. And a highly accurate cast-in product can be obtained. In particular, when casting a rotating body such as a pulley by using the insert molding method according to the present invention, it is possible to obtain a stable and highly accurate rotating body that hardly requires a balance required for correcting eccentricity.

[Brief description of the drawings]

FIG. 1 is a side view showing an aluminizing method according to an embodiment of the present invention, showing a state where a metal material to be processed is held by a holder.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view of a part in which a metal material to be processed is held in a mold, showing a method of assembling according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the shape of a pulley manufactured by the method of casting according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 To-be-processed metal material 1A Belt hook part 1a Holder contact part 1B Mold holding part 2 Holder 4 Aluminum alloy 5 Mold 5A Holding hole 6 Masking agent

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norihito Iwata 3-25-1 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Isuzu Motors, Inc. Kawasaki Plant (72) Inventor Suguru Liu Eighth shelf, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Co., Ltd. Fujisawa Plant (72) Inventor Nobuaki Shinya 3-25-1 Tonomachi, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Isuzu Motors Co., Ltd. Kawasaki Plant (72) Inventor Masami Ueno 3 Tonomachi, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture -25-1 Isuzu Motors Corporation Kawasaki Plant (72) Inventor Makoto Nitta 3-15-1 Sotokanda, Chiyoda-ku, Tokyo Ryobi Corporation Tokyo Head Office (72) Inventor Naomi Nishi Outside Chiyoda-ku, Tokyo 3-15-1 Kanda Ryobi Co., Ltd. Tokyo Head Office

Claims (2)

[Claims] 1. A metal material to be processed is held by a holder, and the metal material to be processed held by the holder is immersed in a molten aluminum or aluminum alloy melt, and is held by the holder from the molten metal. In the aluminizing treatment method of taking out the metal material to be treated and aluminizing the surface of the metal material to be treated, at least the metal material to be treated is retained before the metal material to be treated is immersed in the molten metal. An aluminizing treatment method comprising: applying a masking agent having low wettability to the molten metal to a portion held by a tool; and drying the masking agent. 2. A metal material to be processed is held by a holder, and the metal material to be processed held by the holder is immersed in a molten aluminum or aluminum alloy melt, and is held by the holder from the molten metal. The metal material to be treated is taken out, the surface of the metal material to be treated is aluminized, the metal material to be aluminized is held in a mold, and the molten aluminum alloy is poured into the mold to form the metal. In the assembling method for fusing and bonding the metal material to be processed and the aluminum alloy, at least the metal material to be processed is the holder before the metal material to be processed is immersed in the molten metal for aluminizing treatment. And a step of applying a masking agent having low wettability to the molten metal to the portion held by the method and the portion where the metal material to be treated is held in the mold, and drying the masking agent. Casting-how to the butterflies.