JPH11285727A - Extrusion of clad metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion method for a clad metal, by which different kinds of metal can be exactly and stably clad in a desired part of a base material by using a conventional extruding machine. SOLUTION: This concerns an extrusion method for a clad metal to be performed as follows, that is, a die for forming the outer peripheral part of an extrusion material and a path hole for base material and the path hole for a different kind of material, which have been arranged in the rear part of this die, are divided by partitions. By using an extrusion tool constituted by combining the openings of the rear ends of these path holes and plates 7 (7a to 7c) released in a rearward base material pressure chamber, a different kind of material is arranged in the path hole 12 for a different kind of material, leaving a path for the base material. By applying a pressing force to the base material in the pressure chamber 13, the materials in the path hole for each material are pressed to stick to each other before passing through a bearing part. In the extrusion tool, by preparing plural plates 7a, 7b and 7c whose partitions 14a 14b and 14c have different tip shapes to one die are prepared and are used while replacing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a clad material by, for example, extruding a clad material obtained by cladding a different kind of material having different properties from an aluminum base material by extrusion. .

[0002] In this specification, the term "aluminum" is used to include aluminum and its alloys.

[0003]

2. Description of the Related Art Conventionally, as a method for producing a clad material by extrusion, a method in which a different material is previously incorporated into an aluminum billet for a base material and extrusion is performed, or an extruder equipped with two containers is used. There has been proposed a method in which a container is loaded with an aluminum billet for a base material and another container is loaded with a billet for a different material, and the billet materials are introduced into a common extrusion tool and pressed to perform extrusion.

[0004]

However, in the method of extruding by incorporating a dissimilar material into the base material billet, since the billet and the bearing portion of the die are far apart, both materials are transferred to the die bearing portion. In the meantime, there is a problem that the balance of the plastic flow is greatly disturbed, so that the dissimilar material is not stably clad on the target portion of the base material accurately and stably.

[0005] In particular, when the dissimilar material is harder than the base material, only the base material unilaterally causes a plastic flow and passes through the die bearing portion. There is also a problem that a good clad material cannot be obtained without being clad.

On the other hand, in the method of extruding using two containers, it is necessary to precisely control the extrusion speed of each billet material, and it is not only difficult to control the extrusion speed, but also it is difficult to control the two containers. There is a disadvantage that an extruder having a special structure provided must be used, and a general ordinary extruder cannot be used.

The present invention has been made in view of the above-mentioned conventional problems, and has been developed in consideration of the above-mentioned problems. The present invention relates to a clad material capable of precisely and stably cladding a target material with a different material using an ordinary extruder. It is an object to provide an extrusion manufacturing method.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a die (6) for forming an outer peripheral portion of an extruded material, and a base material disposed at a rear portion of the die (6). The passage hole (11) and the passage hole (12) for dissimilar materials are separated by a partition (14).
(12) An extrusion tool (5) in which a rear end opening is combined with a plate (7) opened to a rear base material pressurizing chamber (13).
The dissimilar material (3) is arranged in the dissimilar material passage hole (12) while leaving the base material passage (11), and the dissimilar material (2) in the pressurized chamber (13) is used. A method for extruding a clad material (1) in which a pressing force is applied to press the materials in the material passage holes (11) and (12) to each other before passing through the bearing portion (9) of the extrusion tool (5). And the extrusion tool (6)
In one of the dies (6), the partition (14a
A plurality of plates (7a), (7b) and (7c) having different tip shapes of (14b) and (14c) are prepared, and these plates (7
a) The basic gist is to manufacture a clad material having the same outer peripheral shape and a different clad shape by exchanging (7b) and (7c).

It is needless to say that terms such as "rear end" and "rearward" are concepts when the direction in which the clad material is extruded is defined as forward.

That is, in the above method, during extrusion, the different material (3) in the different material passage hole (12) of the plate (7) constituting the extrusion tool (5) is added to the base material at the rear end. The pushing force from (2) acts, and the leading-out force of the base material (2) acts on the tip end side, and these forces cause the dissimilar material (3) to pass through the dissimilar material passage hole (12).
And is pressed against the base material (2) and directed to the die bearing part (9). The distance from the material passage holes (11) and (12) to the die bearing part (9) is short, and the base material (2) and the dissimilar material (3) have good plastic flow balance. It will pass through the die bearing part (9) while maintaining. Therefore, the dissimilar material (3) is accurately and stably clad at the intended portion of the base material (2) and extruded. At this time, the shape of the clad portion of the base material (2) and the dissimilar material (3) is the partition wall between the base material passage hole (11) and the dissimilar material passage hole (12) of the plate (7). Since it is determined by the shape of the tip of (14), in the extrusion tool (5), the partition walls (14a) (14b) (14)
c) Multiple plates with different tip shapes (7a) (7b)
If (7c) is prepared, a clad material having a different shape of the clad portion can be manufactured by replacing only the plate (7). When such extrusion is carried out by billet extrusion, the extruder only needs to be provided with one container for loading the base material billet, and therefore, the present invention can be carried out using an ordinary extruder. obtain.

The plurality of plates (7a) and (7b)
The tip shape of the partition (14a) (14b) (14c) of (7c)
By the retreat distance of the front edge of the partition (14a) (14b) (14c) from the front end of the plate (7a) (7b) (7c), or by the inclination angle of the side surface (16c) of the different material passage hole. Different shapes can be provided.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

In this embodiment, FIGS. 1 (a), (b) and (c)
As shown in the figure, the base materials (2a), (2b) and (2c) were
One kind of aluminum, and on one side, as a dissimilar material, a flux-filled brazing material (3a) (3b) (3c) made of a powder compacted material that is harder than the base material (2a) (2b) (2c) Three types of clad materials, which are clad flat bars (1a), (1b), and (1c) and have the same outer peripheral shape and different clad portions, are manufactured by extrusion. As shown in FIG. 2, these flat bars (1a), (1b), and (1c) are flux-brazed materials (3a) (3b) with respect to other members (4).
(3c) is brought into close contact with each other and combined, and joined by burner heating with a torch or heating in a furnace, which can contribute to a reduction in the joining step by eliminating the flux application step. In FIG. 2, the shape of the flat bar (1a) shown in FIG.

Further, flux-containing brazing materials (3a) and (3b)
(3c) is, for example, a solid brazing material composed of a pressed compact of a brazing metal powder containing Si and Al and a fluoride flux powder, and the total content of elements excluding the fluoride flux And the total content of the elements excluding the flux and the fluoride-based flux is 99.9: 0.1 to 70:30 in terms of weight ratio, Is 90% or more of the theoretical value. Such a flux-containing brazing material is manufactured, for example, by the following method. That is, Si,
A brazing filler metal powder containing Al and having a Si content of 3 to 15 wt% and a fluoride flux powder are prepared, and the weight ratio of the brazing filler metal powder and the fluoride flux powder is 99.9: After mixing at a compounding ratio of 0.1 to 70:30, the mixed powder is compacted, and the solidified compact is pressed by secondary processing to make the density 90% or more of the theoretical value. Can be manufactured.

FIGS. 3 to 7 show an extrusion tool (5) and an extruder for manufacturing the flat bar.

The extrusion tool (5) includes a die (6),
And a plate (7) assembled to the rear part.

The die (6) is provided with an inner peripheral bearing (9) corresponding to the outer peripheral cross section of the flat bar (1a) (1b) (1c) at the rear end position. I have. When the material passes through the forming hole surrounded by the bearing portion (9), the flat bars (1a), (1b), and (1c) having the above-mentioned outer cross-sectional shape are extruded.

On the other hand, the plate (7) has two material passage holes, that is, a first passage hole (11) having an uneven square shape for a base material and a second passage hole (12) for a different material. They are provided adjacent to each other and penetrate in the front-rear direction. Second passage hole (12)
Is due to a circular tapered hole that opens outward toward the front. The first passage hole (11) for the base material is arranged concentrically with the forming hole bearing part (9) of the die (6) when the plate (7) is combined with the rear part of the die (6). And a second passage hole (1) for a different material.
2) is formed such that its front end opening is closed at the rear end surface of the die (6). In addition, when the plate (7) and the die (6) are set at the front end of the container (13) of the extruder, the rear end opening of each of the passage holes (11) and (12) is connected to the base material pressurizing chamber. The container (13) is formed so as to open inside the billet hole (13a) of the container (13). The partition wall (14) for partitioning the first passage hole (11) and the second passage hole (12) has a front edge portion of the plate (7).
A communication part (15) that is retracted rearward from the front end face position of the base material and that communicates the first passage hole (11) and the second passage hole (12) to join and bond the base material and the dissimilar material. ) Is formed. The partition wall (14) has an inclined surface inclined toward the first passage hole (11) at the front end of the second passage hole (12) on the first passage hole (11) side. (16) is formed. This inclined surface (16) prevents the hard dissimilar material (3) from the second passage hole (12) from deeply penetrating into the base material (2) in the communicating portion (15), and also reduces the flux. The thickness of the brazing material is controlled.

In this embodiment, a partition (14a) shown in FIGS. 5 and 6 is used as the plate (7).
(14b) Prepare three types of plates (7a), (7b) and (7c) having different tip shapes of (14c), and combine any of these with the die (6) to form the above-mentioned clad. Three types of flat bars with different shapes (1a)
(1b) (1c) is manufactured. The shape of the clad portion corresponds to the tip shape such as the retreat position of the front end of the partition wall (14a) (14b) (14c) or the angle of the inclined surface (16a) (16b) (16c). For example, in the plates (7a) and (7b) shown in FIG. 5, the retreat distance (D) of the front edge of the partition walls (14a) and (14b).
As 1) is increased, the thickness of the different material portions (3a) and (3b) can be increased. The flat bar (1b) shown in FIG. 1 (b) has a thicker flux-filled brazing material (3a) (3b) than the flat bar (1a) of FIG. 1 (a). 14a) and 14b) because the retreat distance (D1) at the front end is set to be larger. FIG.
When the retreat distance (D2) of the plate (7c) shown in (1) is increased and the retreat distance (D3) of the part of the inclined surface (16c) is increased to increase the flat bar (1c). A partial thick portion (3d) can be formed in a dissimilar material portion of the above. On the plate (7c), the inclined surface (16
By forming a concave portion (16d) having a large retreat distance in the central portion of c), a clad portion having a thick portion (3d) in the central portion as shown in FIG. 1C can be formed.

The clad extrusion is performed as follows using the extrusion tool (5). First, a powder compression material (3) made of a flux-containing brazing material is filled and arranged in the second passage hole (12) of the plate (7) of the extrusion tool (5). This filling is performed using an extruder. That is, as shown in FIG. 7 (a), the first passage hole (11) of the plate (7) is closed with a plug material (17), and a billet made of a powder compression material is placed in a container (13) of the extruder. (3) is loaded and extruded. Thereby, the powder compression material (3) is filled and arranged in the second passage hole (12). At the time of this extrusion, as shown in the figure, the tip of the plug material (17) is made to protrude into the molding hole formed by the bearing part (9) of the die (6), and a part of the powder compression material (3) is removed. It is extruded into the molding hole. In addition, the powder compression material (3) into the second passage hole (12)
May be filled not by extrusion but by other methods such as pressing.

Thereafter, as shown in FIG.
The pushing residue at the rear of the plate (7) is removed, the plug material (17) is removed, and the aluminum alloy billet (2) serving as a base material is loaded into the container (13) and extruded. During extrusion, as shown in FIGS. 3 and 4, the rear end of the powder compaction material (3) in the second passage hole (12)
The pushing force from the base material billet (2) in the container (13) acts, and the leading end of the powder compression material (3) is connected to the base material (3) from the communicating portion (15) in the forming hole (9). Pulled in the extrusion direction so as to be taken out in 2), these forces cause the powder compacted material (3) to undergo a plastic flow comparable to that of the base material (2) and fed into the communicating portion (15). Then, it is pressed against the base material (2) and passes through the bearing part (9). As described above, when filling the powder compaction material (3) into the second passage hole (12), a part of the powder compaction material (3) is extruded into the forming hole (9) of the die (6) and protrudes. By leaving the powder compacted material (3)
In the meantime, from the beginning of the extrusion, the take-out force of the base aluminum alloy material (2) acts on the front end thereof, and a pushing force acts on the rear end, so that the powder compression material (3) also acts on the front end. Well clad flat bar (1)
Is obtained.

Incidentally, the three types of plates (7a), (7b), and (7c) shown in FIGS. 5 and 6 are sequentially exchanged, and the amount of flux is reduced by using an extrusion tool (5) combined with the die (6). Fig. 1 (a) with a flux-filled brazing material made of a powder compression-compressed material of 15% as a dissimilar material, an A6061 alloy as a base material, an outer width of 20 mm and a thickness of 4 mm.
(B) Flat bar as shown in (c) (1a) (1
b) (1c) was clad extruded. The extrusion conditions were set to 450 ° C for the billet temperature, the die temperature, and the container temperature for both the flux-filled brazing material and the A6061 alloy.
° C, and the extrusion of A6061 alloy has a ram speed of 0.5 mm.
/ Sec. And As a result, although some speed cracks were observed in the obtained flat bars (1a), (1b), and (1c), it was confirmed that the flux-containing brazing material was stably clad in the longitudinal direction in all cases. I got it. When a plate (7a) having a retreat distance (D1) of 0.5 mm at the tip of the partition wall (7a) is used as the plate (7), the thickness of the flux-containing brazing material (3a) is 1 mm, When a plate (7b) with a distance (D1) of 1.5 mm is used, the thickness of the flux-containing brazing material (3b) is 2 mm, and the retreat distance (D
2) When a plate (7c) having a recess (16d) with a retreat distance (D3) of 3 mm on an inclined surface (16c) of 1.5 mm is used, the thickness of the thin portion of the flux-cored brazing material (3c) is increased. And the thickness of the thick part (3d) was 3.5 mm. Further, as shown in FIG. 2, the flat bars (1a) (1b)
When (1c) was brought into close contact with a plate material (4) made of an A6061 alloy and joined by a burner, it was confirmed that the brazing material was wet and spread and joined.

In the above-described embodiment, the case where the flux-containing brazing material (3) made of a powder compression material is clad on the aluminum base material (2) is described. It goes without saying that the present invention is widely applied to a case where various kinds of powder compression materials having wear resistance or high hardness, or other materials are clad as a different material in addition to the brazing material (3).

[0024]

As described above, the method for producing a clad material according to the present invention by extrusion comprises a die for forming an outer peripheral portion of the extruded material, and a die which is disposed at the rear of the die and which is different from the base material passage hole. The material passage holes are separated by partition walls, and the base material passages are formed by using an extrusion tool in which the rear end openings of the passage holes are combined with a plate opened to the rear base material pressurizing chamber. A different material is placed in the different material passage hole while leaving it, and a pressing force is applied to the base material in the pressurized chamber, and the materials in each material passage hole are pressed against each other before passing through the bearing portion of the extrusion tool. A method for producing a clad material by extrusion, wherein in the extrusion tool, a plurality of plates having different tip shapes of the partition walls are prepared for one die, and these plates are exchanged for use. Outer shape Are used to produce clad material with the same shape but different clad portions.The base material and the dissimilar material each cause a good plastic flow, and the die bearings maintain a good balance of the plastic flow. Therefore, different materials can be clad precisely and stably on the target portion of the base material, and the shape of the clad portion can be changed by changing only the plate of the extrusion tool. Different cladding materials can be manufactured.

Further, when the extrusion is carried out by billet extrusion, the extruder only needs to be provided with one container for loading the base material billet. The invention can be carried out. The present invention can be carried out using a conventional ordinary extruder when extruding with another extruder.

Further, the shape of the clad portion may be changed such that, as the plurality of plates, the tip shape of the partition wall is different depending on the retreat distance of the front edge of the partition wall from the front end surface of the plate. Alternatively, it can be easily performed by using a member having a different shape depending on the inclination angle of the side surface of the different material passage hole.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are cross-sectional views of various clad materials manufactured by a method according to the present invention.

FIG. 2 is a perspective view showing a bonding example using a clad material.

FIG. 3 is a cross-sectional view of an extrusion tool and a container during extrusion.

4A is a sectional view showing the inside of an extrusion tool during extrusion, and FIG. 4B is a partially enlarged sectional view of FIG.

FIG. 5 is a sectional view showing an example of a plate.

FIG. 6 is a sectional view, a main part enlarged side view, and a plan view showing another example of the plate.

FIG. 7A is a cross-sectional view illustrating a step of filling a powder compaction material, and FIG. 7B is a cross-sectional view illustrating a state where a base material billet is loaded in a container after the step of filling the powder compaction material.

[Explanation of symbols]

1, 1a, 1b, 1c ... flat bar (cladding material) 2, 2a, 2b, 2c ... aluminum material (base material, base material) 3, 3a, 3b, 3c ... flux containing brazing material (powder compression material, different type) 5) Extrusion tool 6 ... Die 7, 7a, 7b, 7c ... Plate 9 ... Bearing part 11 ... First passage hole (base material passage hole) 12 ... Second passage hole (different material passage hole) 13 ... Containers (base material pressurizing chambers) 14, 14a, 14b, 14c ... Partition walls 16, 16a, 16b, 16c ... Inclined surfaces (side surfaces of passage holes for dissimilar materials)

Claims (3)

[Claims] A die (6) for forming an outer peripheral portion of an extruded material.
And a base material passage hole (11) and a dissimilar material passage hole (12) arranged at the rear of the die (6).
And these passage holes (11) (12)
Using an extrusion tool (5) in which a rear end opening is combined with a plate (7) released to a rear base material pressurizing chamber (13), the base material passage (11) is left while leaving the base material passage (11). The dissimilar material (3) is placed in the dissimilar material passage hole (12), and the pressure chamber (1
A pressing force is applied to the base material (2) in (3) to press the materials in the material passage holes (11) and (12) together before passing through the bearing portion (9) of the extrusion tool (5). A method for producing a clad material (1) by extrusion, wherein in the extrusion tool (6), a plurality of plates (14a) (14b) (14c) having different tip shapes are formed with respect to one die (6). 7a) (7b) (7c) are prepared, and these plates (7a) (7b) (7c) are exchanged for use. A method for producing a clad material by extrusion. 2. The plurality of plates (7a) (7b) (7c)
The tip shape of the partition walls (14a) (14b) (14c) is the partition wall (14a) from the front end face of the plate (7a) (7b) (7c).
2. The method according to claim 1, wherein the shape of the clad material is different depending on the retreat distance of the front edge of (14b) and (14c). 3. The plurality of plates (7a) (7b) (7c)
The tip shape of the partition walls (14a) (14b) (14c) is different depending on the inclination angle of the side surface (16c) of the different material passage hole of the partition walls (14a) (14b) (14c). Or a method for producing a clad material by extrusion according to 2.