JP2641038B2 - Manufacturing method of cored clad material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for producing a cored clad material obtained by coating a metal core material with another metal skin material, and more particularly to a material for knives such as sickles and knives. It is possible to efficiently produce a high-quality clad plate material suitable as

[0002]

2. Description of the Related Art As is well known, a clad material obtained by metallurgically bonding and laminating a plurality of dissimilar metals has the properties of each constituent metal and is very useful. It is widely used in various fields as a material for manufacturing cutlery such as, or as a building material.

Currently, this clad material is usually produced by the method described in Japanese Patent Publication No. 24-3314 previously filed by the applicant of the present application. That is, as shown in FIG.
On the upper surface, lower surface, and four side surfaces in the longitudinal direction of the metal core material A,
Metal covering material _{B 1 · B 2 · B 3} · B 4 was densely overlapped, each contact edge of the core material A and the skin material _{B 1 · B 2 · B 3} · B 4 to seal welded D After the contact surface is shielded from the outside air by means of the metal, it is metallurgically bonded and integrated by roller rolling in the direction of arrow P (vertical direction) in the figure while maintaining a predetermined forging temperature.
Core material A and outer skin material B (B ₁ , B ₂ , B ₃ ,
B ₄ ) and a flat plate-shaped cored clad material C are obtained.

However, in the case of the clad material C formed by the conventional manufacturing method, poor bonding due to the manufacturing method is likely to occur on a part of the bonding surface between the core material A and the outer skin material B. Thus, the products using the clad material are deteriorated in corrosion resistance and weather resistance.

That is, in the conventional method of manufacturing a clad material, a polymer in which a core material A and a skin material B (B ₁ , B ₂ , B ₃ , B ₄ ) are densely overlapped is pressed in a vertical direction by a roller. Since it was formed into a flat clad material by rolling,
Contact part TT which is in the same direction as the load direction P of roller rolling
(The contact portions between the core material A on both sides and the outer skin materials B ₁ and B ₂ ) tend not to be sufficiently subjected to the rolling load, and therefore, the contact portions in the clad material C after completion. In many cases, defective bonding occurs at T. Particularly, in a product in which the contact portion T is exposed on the surface of the clad material due to processing, the deterioration of corrosion resistance, weather resistance, and the like at the defective bonding portion has become a problem. Of.

For example, when a kitchen knife is manufactured from a clad material, conventionally, as shown in FIG.
To expose the core material A, and the exposed portion of the core material is ground, quenched, and sharpened to produce a knife blade body K having a cutting edge.
In the case of this kitchen knife, as shown in FIG. 3, the joint failure portion of the contact portion T was inevitably exposed near the tip of the peak of the completed kitchen knife blade body K. For this reason, while using the kitchen knife, corrosion is likely to occur in the poorly joined portion of the contact portion T, and rust and the like will gradually progress inside the kitchen knife along the contact portion T, and the appearance will be improved. In addition, there was a need to improve hygiene.

[0007] Particularly, in the case of clad building materials,
If the joint failure part corrodes due to exposure to wind and rain, and if this corrosion also propagates along the contact part T into the interior of the building material, the strength itself of the clad building material will be impaired, which is dangerous. Therefore, there is a concern that the bonding failure at the contact portion T of the clad material may occur.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the cored clad material obtained by the conventional manufacturing method, and the core material produced by the insufficient roller rolling load. It is possible to provide a high-quality clad material at a low cost by eliminating the joint failure between the side surface and the outer covering material, and reducing the number of manufacturing steps such as the surface cleaning processing of the core material and the outer covering material and the welding processing of the both. It is a technical object to provide a method for manufacturing a core clad material.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a cored clad material in the form of a plate, which is formed by covering a metal core material 1 in a sheath shape around a metal core material 1. A slanted surface 11 is formed on a side surface in the longitudinal direction of the core 1, and the core material 1 on which the slanted surface 11 is formed is sandwiched from above and below by a pair of flat metal outer shell materials 2 having an area larger than the core material 1. The core material 1
And the metal outer skin material 2 and 2 are overlapped with each other, and the core material 1 and the outer skin material 2 and 2 in the overlapped state are pressed from above and below by a press die 5 having a recess 51 in at least one of an upper die and a lower die. By processing, the core material 1 and the outer skin materials 2 and 2 are densely laminated, and the core laminated body 3 in which the thickness of the portion where the core material 1 is present in this laminated body is larger than that of the other portion is obtained. The contact 4 between the core material 1 of the cored laminated body 3 and the outer skin materials 2 is obtained by applying welding 4 to the contact edges between the pair of upper and lower outer skin materials 2 constituting the cored laminated body 3. The cored laminate 3 having its surface cut off from the outside air and then subjected to welding 4 is
The technique described above is adopted by adopting a means of producing a clad material composed of a core material 1 and an outer skin material 2 covering the core material 1 in a sheath shape by pressing and rolling from above and below while maintaining the forging temperature. Solved the problem.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;
A description will be given based on a second embodiment. 4 to 7 are schematic cross-sectional views showing the clad material manufacturing process of the first embodiment, and FIG.
Is an enlarged sectional view of an essential part for explaining the load on the slope 11 of the core material at the time of roller rolling, and FIGS. 9 to 12 are schematic sectional views showing the clad material manufacturing process of the second embodiment according to the present invention.

[First Embodiment] The reference numeral 1 in FIG. 4 designates a plate-like metal core material serving as a core material of a clad material. The core material 1 has a width of 32 mm, a length of 650 mm and a thickness of 10 mm. It is made of high-carbon steel for cutting tools (Takefu Special Steel Co., Ltd .; White No. 2 (JIS SK-5 equivalent)). Are vertically symmetrically formed. In FIG. 4, what is indicated by reference numeral 2 is
It is a pair of upper and lower plate-shaped metal outer skins that become the outer skin of the clad material.
Made of 10mm ultra mild steel (SAE 1006).

The core 1 provided with the slope 11 is
The core material 1 and the metal skin materials 2 and 2 are overlapped so as to be sandwiched between the upper and lower two metal skin materials 2 and 2 having a larger area from above and below. Then, the core material 1 and the outer skin materials 2 and 2 in the superposed state are pressed in a vertical direction (direction of an arrow in FIG. 5) by a press die 5 in which concave portions 51 and 51 are formed in the upper die and the lower die, respectively. To process.

By press working by the upper and lower recesses 51, 51 of the press die 5, the two flat plate-shaped outer cover materials 2, 2 are plastically deformed according to the shape of the core material 1 sandwiched between them, and the core material 1
And the two outer cover members 2 are densely stacked without gaps, and as a result, a cored laminate 3 having a bulging portion 3a substantially at the center of each of the upper and lower surfaces is formed. That is, the bulging portion 3a of the cored laminated body 3 is formed by the core material 1 having the outer skin materials 2 and 2.
Which is present inside the core material, and the thickness of the core material internal portion (bulging portion 3a) is larger than that of the other portion (end portion 3b),
The cored laminate 3 can be obtained. The size of the cored laminate 3 of this embodiment is 59 mm in width (about 32 mm in width of the bulging portion 3a).
× length 650 mm × thickness 20 mm (thickness of bulging portion 3 a 30 mm).

Next, welding 4 is applied to the contact edges of a pair of upper and lower outer skin members 2 and 2 forming the core laminated body 3 with the core material 1 sandwiched inside, so that the core material 1 of the core laminated body 3 is formed. The contact surface with the outer skin material 2 is cut off from the outside air. In FIG. 6, reference numeral 4 denotes a weld bead at the contact edge of the outer cover members 2.

Then, the cored laminate 3 to which the welding 4 is applied is
As shown in FIG. 6, while maintaining a forging temperature of 1050 to 1100 ° C., hot rolling is performed by pressing the rolling rollers 6 and 6 from above and below, and as shown in FIG. Is coated with a skin material 2 of extremely mild steel to produce a flat cored clad material having a width of 45 mm, a length of about 3,000 mm, and a thickness of 7 mm (core material: 32 mm in width, 2.0 to 2.7 mm in thickness). Of.

The method of manufacturing the clad material of the first embodiment is carried out as described above. However, in the clad material manufactured by using this method, the side surface of the core material due to the insufficient load seen in the conventional product is considered. It is possible to eliminate the joint failure between the outer cover and the outer cover material.

First, in the manufacturing method of the present invention, since the inclined surface 11 is provided on the longitudinal side surface of the core material 1,
This is because when rolling the cored laminate 3, the rolling load direction and the side surface (slope 11) of the core material 1 do not have the same direction as in the conventional case, but have an angle. As shown in FIG. 8, since the side surface (slope 11) of the core material 1 is inclined,
A vertical roller rolling load is surely applied to the slope 11 as well, so that the metallurgical joining of the side surface of the core material 1 and the outer skin material 2 by hot rolling can be advanced as compared with the conventional case.

Secondly, in the manufacturing method of the present invention, the cored laminated body 3 is formed in a shape having a bulged portion 3a (an internal portion of the core material 1) at substantially the center of each of the upper and lower surfaces. As shown in FIG. 8, the rolling by the rolling rollers 6 is first performed at the bulging portion 3 a of the cored laminate 3. That is, when only the bulging portion 3a is pressed by the rolling roller 6 and the outer skin material 2 of the bulging portion 3a extends outward, the outer skin material 2 at the end 3b of the cored laminate 3 extends outward. It is still in its original state. Therefore, the bulging portion 3a
In this case, the extension flow of the outer skin material 2 is blocked at the end 3b, and the vertical rolling load is reduced by the slope 11
And effectively improves metallurgical bonding between the side surface of the core material 1 and the outer skin material 2.

As described above, according to the manufacturing method of the present invention, the joint failure near the side surface of the core material can be satisfactorily resolved, and further, the manufacturing process thereof can be considerably simplified, and a high-quality clad material can be provided at a low cost. Is. In other words, conventionally, when manufacturing this clad material, the surface of the core material and the outer skin material must be subjected to cleaning in advance, but according to the manufacturing method of the present invention, the core material and two outer skin materials sandwiching the core material are required. Only the pre-processing needs to be performed. On the other hand, in the conventional manufacturing method, as shown in FIG. 1 described above, in addition to the core material A, it is necessary to perform a pretreatment on a total of four outer skin materials O, which is very troublesome. Was.

Further, in the present invention, the outer skin material 2 is plastically deformed in conformity with the shape of the core material 1 by pressing with the press die 5 having the recess 51, and the side portion of the core material 1 is covered with the outer skin material 2. Since it is made to cover, the clad material can be manufactured by only one core material 1 and two outer skin materials 2 sandwiching the core material 1, and the welding process 4 for shutting off the outside air can be performed by the outer skin materials 2 and 2.
Only the contact edges between them can be completed. Therefore, it becomes possible to provide a high-quality clad material efficiently and inexpensively. Incidentally, up to now, a manufacturing method has been proposed which simplifies the welding work by providing a fitting groove in the center of the outer cover material and fitting the core material into the fitting groove. However, this method requires a lot of man-hours for groove processing,
In addition, since the expensive material in the groove is to be discarded, the reduction of the manufacturing cost was hardly observed.

Second Embodiment Next, a second embodiment according to the present invention will be described with reference to FIGS. Second
The embodiment is characterized in that the slope 11 is formed only on the upper part of the side surface in the longitudinal direction of the core material 1 serving as the core material of the clad material.

That is, as shown in FIG.
Is high carbon steel for cutting tools 32mm wide x 650mm long x 10mm thick (made by Takefu Special Steel Co., Ltd .; White No.2 (JIS SK-5 equivalent))
A slanted surface 11 having an inclination of about 55 ° is provided only on the upper side surface of each of both side surfaces in the longitudinal direction of the core material 1, and the cross-sectional shape of the core material 1 has an equipodal trapezoidal shape. It is.
A pair of upper and lower outer skin materials 2 sandwiching the core material 1 is 70 mm wide.
It is made of very mild steel (SAE 1006) with a length of 650 mm and a thickness of 10 mm. In the press die 5 used in this embodiment, the concave portion 51 is formed only in the upper die, and the press lower die is flat without any concave portion.

The core material 1 and the outer skin material 2 formed as described above are overlapped, and this combined body is vertically moved (in the direction of an arrow in FIG. 10) by a press die 5 having a recess 51 only in the upper die. Press working. By this press working, the upper skin material 2 of the two flat plate-shaped skin materials 2 is
The core member 1 is plastically deformed in accordance with the shape of the isosceles trapezoid, and the core member 1 and the two outer shell members 2 are densely laminated without any gap. Thus, the cored laminate 3 having the above is formed. The size of the cored laminate 3 of this embodiment is 60 mm in width (about 32 mm in width of the bulging portion 3a) × 650 mm in length × 20 mm in thickness (30 mm in thickness of the bulging portion 3a).

Then, welding 4 is applied to the contact edges of the upper and lower outer skin materials 2 and 2 to shield the contact surface between the core material 1 and the outer skin materials 2 and 2 of the cored laminate 3 from the outside air, As shown in FIG. 11, while maintaining the forging temperature of 1050 to 1100 ° C., hot rolling is performed by applying pressure from the vertical direction with the rolling rollers 6 and 6, as shown in FIG. A flat cored clad material with a width of 45 mm x a length of approximately 3200 mm x a thickness of 7 mm (core material; width 32 mm x thickness 2.0 to 2.8 mm), which is formed by coating the outer periphery of the ultra-soft steel skin material 2, is manufactured. It is done.

As described above, in the present embodiment, the slope 11 is provided only on the upper part of the side surface of the core material 1. However, as in the first embodiment described above, the slope 11
Since the slope 11 is inclined, the roller rolling load is surely applied to the slope 11 on the side surface of the core 1, and furthermore, the extension flow block of the skin 2 by the end 3 b of the cored laminate 3. Since the action also works, the roller rolling load in the vertical direction effectively acts on the slope 11, and the metallurgical joining between the side surface of the core 1 and the skin 2 is also reliably performed,
It is also possible to solve poor joints accompanied by a decrease in corrosion resistance and weather resistance.

The first and second embodiments, which are specific examples of the method for producing a cored clad material according to the present invention, are generally constructed as described above, but the present invention is limited to these embodiments. Various modifications are possible within the description of "Claims" rather than the description.

For example, in the above-described embodiment, the slope 11 provided on the side surface in the longitudinal direction of the core material 1 is formed in a flat shape, but is not limited to this. It is sufficient that the slope 11 is inclined with respect to the rolling load direction (vertical direction), and the slope 11 can be formed into a two-step slope in which the slope changes in the middle, or can be changed to a curved shape. The degree of application of a vertical load to the slope 11, the bulging portion 3 a and the end 3 in the cored laminate 3.
It changes depending on the thickness difference from b and the degree of progress of roller rolling,
Various selections can be made in consideration of, for example, the effect of the end portion 3b on the spreading and flow blocking of the outer covering material 2.

[0028]

As described above with reference to the embodiments, in the method for producing a cored clad material according to the present invention, since a slope is formed on the side surface of the core material constituting the clad material, During the hot rolling, the rolling load is surely applied to the side surface of the core material, and moreover, the laminated body with the core material and the plate-shaped outer cover material is concavely pressed to form a laminate having a bulge in the center. Since the laminate is hot-rolled, the spreading flow of the skin material at the bulge portion of the laminate caused by hot rolling is blocked by the unrolled skin material at the end of the laminate. Thus, the rolling load applied in the vertical direction effectively acts on the slope, and metallurgical bonding between the core material side surface and the outer skin material due to insufficient hot load is surely performed, which was conventionally present in the clad material. By eliminating poor joints That.

Further, in the manufacturing method of the present invention, the flat outer shell material is plastically deformed according to the shape of the core material sandwiched therebetween by performing a concave press working, and the side portions of the core material are outer shells. In order to manufacture a cored clad material containing one kind of core material, it is sufficient to prepare only one core material and two outer skin materials sandwiching it, the core material and Pre-treatment such as surface cleaning applied to the outer shell material and welding processing to shield the contact surface of the core material and the outer shell material from the outside air can be performed in a much smaller number of processes than in the past. Can be provided inexpensively and efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a manufacturing process of a conventional cored clad material.

FIG. 2 is a schematic sectional view illustrating a process of manufacturing a kitchen knife from a cored clad material.

FIG. 3 is a schematic perspective view showing a position of a joint failure portion in a conventional knife blade made of a cored clad material.

FIG. 4 is a schematic cross-sectional view showing a manufacturing process of the clad material of the first embodiment according to the present invention.

FIG. 5 is a schematic cross-sectional view showing a clad material manufacturing process of the first embodiment according to the present invention.

FIG. 6 is a schematic sectional view showing a clad material manufacturing process of the first embodiment according to the present invention.

FIG. 7 is a schematic cross-sectional view showing a clad material manufacturing process of the first example according to the present invention.

FIG. 8 is an enlarged sectional view of an essential part for explaining the load on the slope of the core material during roller rolling in the clad material manufacturing process of the first embodiment.

FIG. 9 is a schematic sectional view showing a clad material manufacturing process according to a second embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view showing the clad material manufacturing process of the second example according to the present invention.

FIG. 11 is a schematic sectional view showing a clad material manufacturing process of a second embodiment according to the present invention.

FIG. 12 is a schematic sectional view showing a clad material manufacturing process of a second embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core material 11 Slope 2 Skin material 3 Core laminated body 4 Weld bead 5 Press mold 51 Depression

Claims (2)

(57) [Claims] 1. When manufacturing a plate-shaped cored clad material in which a metal outer cover material 2 covers a periphery of a plate-shaped metal core material 1 in a sheath shape, a slope is formed on a side surface in a longitudinal direction of the plate-shaped core material 1. 11 is formed, and the core material 1 on which the inclined surface 11 is formed is vertically sandwiched by a pair of flat plate-shaped metal skin materials 2 having a larger area than the core material 1 and the core material 1 and the metal skin material. 2 and 2 are overlapped with each other, and the core material 1 and the outer skin material 2 and 2 in the overlapped state are pressed from above and below by a press die 5 having a recess 51 in at least one of an upper die and a lower die. And a cored laminate 3 in which the core material 1 and the outer skin materials 2 are densely laminated, and the thickness of the portion of the laminate where the core material 1 is present is larger than that of the other portions. By applying welding 4 to the contact edges of the pair of upper and lower skin materials 2 forming the core laminate 3, Then, the contact surface between the core material 1 and the outer skin materials 2 of the cored laminate 3 is cut off from the outside air. Then, the cored laminate 3 on which the welding 4 has been performed is held in the vertical direction while maintaining the forging temperature. And producing a clad material comprising a core material 1 and a shell material 2 covering the core material 1 in a sheath shape by rolling under pressure. 2. The method for producing a cored clad material according to claim 1, wherein the metal core material 1 is high carbon steel for cutting tools, and the metal sheath material 2 is low carbon stainless steel or soft iron.