JP2002316251A - Insert member and its producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an insert member sufficiently joining a base material to be inserted with an inserting material having a different kind of or the same kind as the base material to be inserted, and a method for producing the insert member which has good pouring yield and can be produced at a low cost without applying a preheating process or a thermal-spraying process to the base material to be inserted except the casting process. SOLUTION: The insert member is substantially joined with projecting parts formed in the base material to be inserted and the inserting material having the different kind of or the same kind as the base material to be inserted at the surrounding of the projecting parts. Further, the method for producing the insert member is performed, with which the projecting parts are formed in the base material to be inserted, and molten metal is poured so as to collide against the projecting parts from gates formed in a mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast-in member and a method for manufacturing the same.

[0002]

2. Description of the Related Art When a stuffed joint is joined to a stuffed material with a molten metal as a stuffed material, the stuffed material and the molten metal are chemically reacted at a joining interface, or mutual constituent atoms are diffused. It is necessary to get a fit. For example, Japanese Patent Application Laid-Open No. 10-156515 discloses that a to-be-stuffed material is formed by using a steel material having a carbon content of 0.5% by weight or less, and this to-be-stuffed material is disposed in a mold. There is a description that a molten metal having a cast iron composition is poured and the pouring is continued until the temperature of the material to be cast reaches at least 1050 ° C., thereby welding the material to be cast and the base material cast iron. As described above, it is necessary to transfer the heat of the molten metal to the material to be cast, to heat the material to be cast to near the melting point, to reduce the temperature difference between the two, and to raise the temperature at the bonding interface to perform the bonding.

[0003]

Further, in "Casting", Vol. 64 (1992), No. 4, page 262, published by the Japan Foundry Engineering Society, it is necessary to cast a blank material with molten metal without gaps. There is a description that in order to raise the temperature of the joining interface, a molten metal having a volume ratio of 16 times or more of the material to be cast is required. Similarly, Japanese Patent Publication No. 6-45063 describes that after a predetermined amount of molten metal passing through a material to be cast is discharged to the outside, the outflow path is closed to fill the cavity with the molten metal.

However, according to the technique described in the above-mentioned literature, it is necessary to inject an extra molten metal 16 times or more the total volume of the to-be-stuffed material, and the injection yield decreases. Further, in the technique described in Japanese Patent Publication No. 6-45063, it is necessary to form a means for closing the discharge path of the molten metal separately from the mold.

[0005] By the way, it is conceivable to cast a pre-heated material to be cast at a high temperature in a mold. But,
In addition to the casting step, the number of steps of preheating the to-be-cast material to a high temperature increases, and handling of the pre-heated to-be-cast material to be placed in the mold becomes difficult. Further, if the material to be cast is preheated in the air, an oxide scale is formed on the surface, and the oxide scale tends to make joining difficult.

On the other hand, Japanese Patent Publication No. 55-3074 discloses that
As a method of casting a mild steel material with a wear-resistant cast iron, a sprayed layer of a self-fluxing nickel alloy containing B, Si, and Ni is formed on the surface of the mild steel material, and the molten metal having a wear-resistant cast iron composition is formed by the sprayed layer. There is a description that the resin reduces the shrinkage stress generated at the time of cooling and solidification, and provides good bonding. Also, “Casting”, Vol. 64 (1992), No. 10, No. 710, published by the Japan Foundry Engineering Society.
On the page, there is a description of spraying a Co-B-Si alloy as the third layer. The third layer lowers the melting point of the bonding interface, improves the wettability between the material to be cast and the molten metal, and suppresses the formation of oxide scale on the surface of the material to be cast. However, the number of steps of spraying a self-fluxing nickel alloy or a Co-B-Si-based alloy on a material to be cast increases, and a self-fluxing nickel alloy, a Ni-based or a Co-B-Si-based alloy is expensive, so Manufacturing costs increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a cast-in member that satisfactorily joins a cast-to-be-filled material and a different or similar kind of a cast-filled material, and has a good injection yield and a process other than the casting process. An object of the present invention is to provide a method of manufacturing a cast-in member that can be manufactured at low cost without a preheating step or a thermal spraying step of the cast-to-be-filled material.

[0008]

Means for Solving the Problems The inventors of the present invention have intensively studied whether or not a stuffing of a stuffed material to be cast can be satisfactorily joined by only a casting process and a small amount of molten metal injected. As a result, the present inventors have found that the above problem can be solved by appropriately forming a projection on the material to be cast and injecting a molten metal into the projection so as to collide with the projection, and arrived at the present invention.

That is, in the stuffed member of the present invention, the projection formed on the material to be cast and the stuffed material different from or similar to the material to be cast are substantially joined around the projection. It is characterized by the following.

[0010] The material to be cast is substantially joined to the cast-in material around the protrusion, and if the strength of the joint is greater than the stress or shear force applied to the cast-in material, the material can be used as a cast-in material. Here, the term "substantially joining" means that the material to be cast is mainly joined to the cast-in material, and includes that the material other than the protrusion is joined to the cast-in material.

Further, in the cast-in member according to the present invention, the material to be cast has an annular portion, and the protrusions are formed at least three or more substantially equally around the annular portion. And

When three or more projections are formed around the annular portion in a substantially evenly distributed manner, and these projections are used as a main body, even if a rotational force or the like is applied to the annular portion, the projections are substantially equally distributed. Responsible for this rotational force and the like, the strength is secured. The number of the protrusions may be less than three as long as the bonding strength of the protrusions is large.

[0013] Next, the method for manufacturing a cast-in-place material according to the present invention is characterized in that a molten metal of the same or different kind as the cast-to-be-filled material is poured into a cavity of a mold in which the cast-to-be-filled material is arranged;
A method for manufacturing a cast-in member for joining a cast-filled material and a solidified metal, wherein a protrusion is formed on the cast-filled material, and the molten metal is formed from a weir formed in the mold to the protrusion. It is characterized by being injected so as to collide.

When molten metal is injected from the weir formed in the mold toward the projection, the high-temperature molten metal having a flow velocity collides with the projection. Then, the protruding portions come into contact with each other as if wrapped in the molten metal except for the base, and the heat is transferred from the high-temperature molten metal, and the volume of the transferred heat gradually increases. Thereafter, by continuously injecting the molten metal from the weir so as to collide with the protrusion, the protrusion is continuously heated, and the amount of heat required for joining can be easily obtained. Then, after the molten metal is solidified, the protrusion and the cast-in material are satisfactorily joined. As described above, since only the protruding portion is heated by the high-temperature molten metal, the pouring amount is reduced, the injection yield is improved, and the casting time is shortened.

In the method for manufacturing a cast-in member according to the present invention, the distance between the tip of the weir and the tip of the projection is 10 m.
By setting it to m or less, heating of the protruding portion by the molten metal is promoted, and bonding is further improved. The distance between the tip of the weir and the tip of the protrusion is defined as the distance between the tip of the weir and the tip of the protrusion in the direction in which the molten metal exiting the weir advances due to inertial force.

[0016]

Next, embodiments of the present invention will be described. (Embodiment 1) FIG. 1 shows a cast-in member 1 of Embodiment 1.
(A) is a front view thereof, (b) is a cross-section AA in (a), (c) is a front view of the to-be-molded material 2 alone,
(D) is a partial enlarged view of the protrusion 2a of the to-be-cast material 2. In FIG. 1, the material 2 is a (JIS) SCM
415, the outer diameter D1 is 130 mm, and the inner diameter d1 is 1.
05mm, inner diameter d2 is 95mm, thickness B1 is 25mm,
Four protrusions 2a having a width b1 of 5 mm, a width b2 of 12 mm, a protrusion amount L1 of 18 mm, and a thickness t1 of 5 mm are formed substantially equally inside the annular portion 2b having a thickness t1 of 5 mm. are doing. Then, around the protruding portion 2a of the to-be-stuffed material 2, a to-be-filled material 3 made of spheroidal graphite cast iron equivalent to (JIS) FCD370 is joined to the joining portion 4 to form the to-be-stuffed member 1. This cast-in member 1 can be used if the strength of the joint 4 is greater than the stress or shear force applied to the cast-in member 1. Further, even if a rotational force or the like is applied to the annular portion 2b, the rotational force or the like is covered by approximately four equally arranged protrusions 2a, and the strength is secured.

Next, a method of manufacturing the cast-in member 1 will be described. 5A and 5B show a mold 11 for casting the stuffed member 1, wherein FIG. 5A is a sectional view thereof, and FIG. 5B is a sectional view C of FIG.
-C is indicated. This mold 11 is provided with a lower core 14 in which a to-be-molded material 2 is arranged in a lower mold 12 and an upper mold 13 which are matched.
And the upper core 15 are housed. Further, the mold 11 has a gate 16, runners 17 a and 17 b, an injection section 18, and an injection section 1.
8, four weirs 19 going to the protrusions 2 a of the to-be-stuffed material 2, cavities 20 to be the as-stuffed material 3, and runners 21 upward from the cavities 20 between the respective protrusions 2 a
And a spout 22 communicating with the runner 21. The distance L4 between the tip of the weir 19 and the tip of the projection 2a is 7 mm.

When molten metal having a spheroidal graphite cast iron composition is poured into the pouring gate 16 of the mold 11 at, for example, 1360 ° C., the molten metal enters the pouring section 18 through the runners 17a and 17b as shown by arrows. The two weirs 19 collide with the protrusion 2a of the material 2 to be cast with a flow velocity. As a result, the protruding portions 2a come into contact with each other as if wrapped in the molten metal except for the base, and the heat is transferred by the high-temperature molten metal. Further, protrusion 2
The molten metal that has passed through a flows out from the runner 21 into the spout 22 after filling the cavity 20. Heating of the protrusion 2a is continued by the molten metal until a predetermined amount of the molten metal flows into the spitting tank 22, so that the joint portion 4 can obtain a heat quantity necessary for the joining. Then, after the molten metal is solidified, the protruding portions 2 a are satisfactorily joined with the insert 3. Further, since only the protrusion 2a is heated by the high-temperature molten metal, the pouring amount is reduced, the casting yield is improved, and the casting time is shortened.

FIG. 3 is a photomicrograph (× 10) of a microstructure in the vicinity of the joint 4 of the cast-in member 1, and FIG. 4 (a) is a photomicrograph (× 100) of a D portion in FIG. (B) is a photomicrograph (× 100) of the microstructure of the E site in FIG.
From the microstructure photographs of FIGS. 3 and 4, there is no oxide or void at the interface of the joint 4, and the carburization in which about 0.3 mm carbon atoms diffused from the as-cast material 3 to the as-cast material 2. It can be seen that the layer is recognized and the diffusion bonding is performed favorably, and the bonding is performed without any gap from the tip of the projection 2a to the base.

Here, the projecting portion 2a, the cast toy material 2,
The volume of the cast metal 3 and the volume of the molten metal that has flowed into the spit 22 will be examined. The volume of the four protrusions 2a (“V
Total and t ") is 2.8 × ^{10 3} mm 3, the 4
Of the material 2 to be cast including the two protrusions 2a (“V
L ”) is 120 × 10 ³ mm ³ , the volume of the as-cast material 3 (referred to as“ Vd ”) is 46 × 10 ³ mm ³ , and the volume (Vh) discharged to the spit is 190 × 10 ³ mm ³ Met. If an attempt is made to insert the material to be cast 2 without forming the projection 2a, the volume of the material to be inserted [(VL =
120)-(Vt = 2.8)] = 117.2 × 10 ³ m
16 times or more of m ³ , that is, 1875.2 × 10 ³ mm ³
It is necessary to pass the above molten metal to the joint. However, according to the first embodiment, [(Vd = 46) + (Vh
= 190)] / (VL = 120), it was found that bonding could be performed with about twice as much molten metal, and the injection yield was significantly improved.

(Embodiment 2) FIG. 2 shows a cast-in member 1 of Embodiment 2, (a) is a front view thereof, (b) is a cross section BB in (a), and (c) is FIG. 3D is a front view of the to-be-cast material 2 alone, and (d) is a partially enlarged view of a protrusion 2 a of the to-be-cast material 2. In FIG. 2, the material 2 to be cast is (JI
S) SCM415 having an outer diameter D1 of 130 mm, an inner diameter d1 of 105 mm, an inner diameter d2 of 95 mm, a thickness B1 of 25 mm, and a thickness t1 of 5 mm. Is 12 mm, the protrusion amount L2 is 18 mm, the thickness t2 is 2 mm, and L3 is 13 m.
Four protrusions 2a having a length of m are formed substantially equally. A stuffing member 3 made of spheroidal graphite cast iron equivalent to (JIS) FCD370 around the projection 2a and the annular portion 2b of the stuffed material 2 and a stuffing member 1 joined at the joining portion 4
And This cast-in member 1 can be used if the strength of the joint 4 is greater than the stress or shear force applied to the cast-in member 1. Further, even if a rotational force or the like is applied to the annular portion 2b, the rotational force or the like is covered by approximately four equally arranged protrusions 2a, and the strength is secured.

The cast-in member 1 of the second embodiment can also be manufactured by using the mold 11 shown in FIG. . The total volume (Vt) of the four protrusions 2a is 2.3 ×
10 ³ mm ³ , the volume (VL) of the to-be-stuffed material 2 including these four protrusions 2a is 120 × 10 ³ mm ³ , the volume (Vd) of the to-mold material 3 is 46 × 10 ³ mm ³ , The volume (Vh) flowing out of the skein was 0 × 10 ³ mm ³ .
According to the second embodiment, [(Vd = 46) + (Vh =
0)] / (VL = 120), it was found that bonding could be performed with 1 / 2.6 molten metal, and the injection yield was significantly improved.

[0023]

As described in detail above, according to the cast-in member of the present invention, the material to be cast and the cast-in material of the same or different kind are satisfactorily joined to each other. It is practical if it is larger than the stress or shear force applied to the member. Further, according to the method for manufacturing a cast-in member of the present invention, the casting yield is good, and the cost can be reduced because there is no pre-heating step or thermal spraying step of the cast-to-be-filled material other than the casting step.

[Brief description of the drawings]

FIG. 1 shows a cast-in member according to a first embodiment, and FIG.
Is a front view, (b) is a cross section AA in (a), (c)
FIG. 2 is a front view of the cast tough material alone, and FIG. 4D is an enlarged view of a protrusion of the cast toy material.

FIGS. 2A and 2B show a cast-in member according to a second embodiment, wherein FIG. 2A is a front view thereof, FIG. 2B is a cross-sectional view taken along line BB of FIG. (D) is an enlarged view of the protrusion of the material to be cast.

FIG. 3 is a microstructure photograph (× 1) of a joint portion of a cast-in member.
0).

FIG. 4 (a) is a photomicrograph (×) of a microscopic structure of a D site in FIG.
100) and (b) are micrographs (× 100) of the microstructure of the E site in FIG.

5A and 5B show a mold for casting a cast-in member, wherein FIG. 5A is a cross-sectional view of the mold, and FIG. 5B is a cross-section CC of FIG.

[Explanation of symbols]

 1: As-molded member 2: As-molded material 2a: Projecting portion 2b: Annular portion 3: As-molded material 4: Joint portion 11: Mold 12: Lower mold 13: Upper mold 14: Lower core 15: Upper core 16 : Gate 17a, 17b, 21: Runner 18: Injection part 19: Weir 20: Cavity 22: Spit

Claims (4)

[Claims] 1. A stuffing member characterized in that a projection formed on a material to be cast and a stuffing material different from or similar to the stuffing material are substantially joined around the projection. . 2. The method according to claim 1, wherein the material to be cast has an annular portion, and the protrusions are formed at least three or more substantially equally around the annular portion. Cast-in member. 3. A molten metal which is a different kind of or similar to the to-be-stuffed material is poured into a cavity of a mold in which the to-be-stuffed material is arranged, and the to-be-stuffed material and the to-be-stuffed material are joined. A method for manufacturing a cast-in member, wherein a protrusion is formed on the material to be cast, and the molten metal is injected from a weir formed in the mold so as to collide with the protrusion. A method for manufacturing a cast-in member. 4. The distance between the tip of the weir and the tip of the projection is 1
The method for producing a cast-in member according to claim 3, wherein the thickness is 0 mm or less.