JP2002035959A - Manufacturing method for material for titanium clad utensil with aluminum base layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a material for a titanium clad utensil which has light weight, excellent usability and heat conductivity, a surface having excellent lubricity keeps food clean without scorching cooked items, and is usually kept clean by allowing seasoning such as oils and fats, salt or soy source adhered thereto to be easily wiped out with a disk towel or paper or the like. SOLUTION: Aluminum to be a base layer is heated at 370-430 deg.C and maintained, and titanium, stainless steel or steel which covers a surface of the aluminum is heated at 150-240 deg.C and maintained. They are laminated so as to be three-layer-order such as titanium-aluminum-titanium, titanium- aluminum-stainless steel, or titanium-aluminum-iron, or two-layer-order such as titanium-aluminum, integrally joined by rolling at single pass under a draft of 20-40%, and diffused and annealed at 350-430 deg.C.

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 of manufacturing a material for a clad object, and more particularly, to a heating temperature and rolling reduction of aluminum serving as a base layer and this aluminum coated metal material during rolling. Rolled under specific optimum conditions and metallurgically bonded, and diffusion annealing treatment promotes diffusion at the bonding interface, increases bonding strength, has excellent heat conduction, and has good soaking performance A method for manufacturing a material for a clad object using aluminum as a base layer, which can be used as an easy-to-use object product which has heat insulation performance, is lightweight, and hardly causes scorching of a cooked product when made in a cooking container such as a frying pan. It is about.

[0002]

2. Description of the Related Art As is well known, aluminum is lightweight and has excellent thermal conductivity.
It is widely used as a material for oil tanks for frying. However, aluminum has the drawback that it quickly cools down even when preparing hot dishes, and recently it has been said that aluminum is the causative agent of Alzheimer's disease. As a result, the use of aluminum has become a challenge.

However, the lightness and high thermal conductivity of aluminum are outstanding as a performance of cooking utensils and are difficult to discard. Under such circumstances, the lightness and high thermal conductivity of aluminum are such that foodstuffs do not come into direct contact. Efforts have been made to make use of sex in cooking utensils.

A manifestation of such efforts is the use of cladding technology, in which aluminum is intended to be sequestered within a metal layer as a matrix material so as not to come into direct contact with foodstuffs. Was coated with stainless steel or iron, and cooking utensils became commercially available with a layered cladding material such as stainless steel-aluminum-stainless steel or iron-aluminum-iron.

[0005] However, the above-mentioned conventional clad material for which aluminum is used for the base layer has the characteristic of lightweight aluminum which loses the characteristic as a lightweight aluminum because an iron-based metal is bonded to both surfaces of aluminum. Even if cooking utensils were made, they became heavy and unwieldy.

In recent years, attention has been paid to the lightness, corrosion resistance, and high-grade texture of titanium, and titanium has been used as a material for various consumer goods such as glasses, decorative articles, and scissors. The present inventor has paid attention to the lightness and corrosion resistance of such titanium, and has begun research on the development of its use as a cooking utensil material.

[0007] First, cooking utensils such as pot pots made of pure titanium have a high market cost because the cost of materials is too high. However, even though the cooking utensils made of titanium are not treated with fluororesin, the surface is rich in lubricity and the cooked food can hardly be scorched, and the inner surface can be kept clean, Even if seasonings such as fats and oils, salt and soy sauce adhered, it was found that it could easily fall off and maintain a sanitary condition simply by wiping lightly with a cloth or paper.

The inventor of the present invention came up with the idea of coating aluminum with this in order to utilize the excellent surface lubricity, lightness and corrosion resistance of titanium in cooking utensils. We prototyped an aluminum clad material covered with, and made a pot with it.
Indeed, the titanium-aluminum-titanium or titanium-aluminum cooking utensils made in this way are lightweight and easy to handle, do not scorch the food, and can be easily wiped off even if seasonings adhere. It is said to be suitable for maintaining a sanitary condition.

However, in recent years when electromagnetic cookers have become widespread, pots made of such titanium-aluminum-titanium or titanium-aluminum three-layer or two-layer titanium clad materials have no electromagnetic heating function. Inconvenient. However, in this case, by depositing magnetic stainless steel or iron on the opposite surface of titanium,
It is possible to have an electromagnetic heating function.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional material for clad objects, and is lightweight, easy to use, and excellent in heat conductivity. In addition, the surface is rich in lubricity and the cook can hardly burn, so that the inner surface can be kept clean,
Provided is a method of manufacturing a material for clad utensils, which can easily fall down even if seasonings such as fats and oils, salt, and soy sauce are adhered thereto by simply wiping it off with a cloth or paper so that the housing surface can be kept hygienic. It is an issue.

Another technical object of the present invention is to provide a three-layer titanium clad material of titanium-aluminum-titanium, titanium-aluminum-stainless steel, or titanium-aluminum-iron, or titanium-aluminum-iron.
It is an object of the present invention to provide a new method capable of producing an ideal material for a clad object by one-pass metallurgically joining a titanium clad layer material to a thickness required for each of these layers.

Further, another technical object of the present invention is to provide an innovative method for efficiently producing a titanium clad material having a metal layer structure suitable for heating by an electromagnetic cooker, if desired. To provide.

[0013]

Means adopted to solve the problem The technical means adopted by the present inventor to solve the above problems will be described as follows.

That is, according to the present invention, aluminum is used as a base layer, and titanium is deposited on one surface of the base layer, and titanium, stainless steel, or iron is formed on the opposite surface of the base layer. In producing a three-layered titanium clad material for material or a two-layer titanium clad material in which aluminum is used as a mother layer and titanium is laminated on one surface of the aluminum, aluminum to be formed in the mother layer is removed. The aforementioned titanium, stainless steel or iron to be coated on both sides or one side of this aluminum at 370-430 ° C, respectively, is heated and maintained at 150-240 ° C. Stacked in the order of titanium-aluminum-titanium, or titanium-aluminum-stainless steel, or titanium-aluminum-iron; In the case of a structure, a processing means of stacking in the order of titanium-aluminum, rolling them together in one pass at a rolling reduction of 20 to 40% to join them together, and then performing diffusion annealing at 350 to 430 ° C. There is a feature in adopting.

However, the most difficult thing for the present inventor to complete the method of the present invention is that aluminum, titanium, and stainless steel having different physical properties such as processing temperature, deformation resistance, ductility, hardness, and oxidation resistance. When performing warm working on a plurality of types of metal materials such as iron, and joining them together by one-pass rolling, a. How to set the processing temperature of each metal; b. How much the total stack thickness of each metal should be reduced; c. The problem was how to set the treatment temperature for diffusion annealing.

In order to elucidate the processing conditions at the preceding stage, the present inventor used aluminum, titanium, stainless steel, and iron using the following test pieces to determine the appropriate heating temperature, rolling reduction, and diffusion annealing temperature. , And a rolling test shown in Table 1 was tried. * Aluminum JIS H 4000 A1100P (thickness: 3.0mm, width: 100mm, length: 200mm) * Titanium JIS H 4600 TP 270C (thickness: 0.5mm, width: 100mm, length: 200mm) * Stainless steel JIS G 4304 SUS430 (thickness) : 0.5mm, width: 100mm, length: 200mm) * Iron JIS G 3141 SPCE (thickness: 0.5mm, width: 100mm, length: 200mm)

[Table 1]

The above JIS H 4000 A1100P (thickness: 3.
0mm, width: 100mm, length: 200mm) aluminum and JIS
H 4600 TP 270C (Thickness: 0.5mm, width: 100mm, length: 200mm)
I also tried a rolling test with titanium. The results are shown in Table 2 below.

[Table 2] The following facts were confirmed by the test results shown in Tables 1 and 2 above.

1) Titanium-aluminum-titanium, titanium-aluminum-stainless steel, titanium-aluminum-iron, or titanium-aluminum, in the order of stacking and bonding of titanium clad material, bonding strength, bonding strength, rolling In general, the same tendency appeared in the comprehensive judgment results of gender and the like. I. In a series of tests in which the heating rate was kept constant (aluminum at 400 ° C and titanium and stainless steel / iron at 200 ° C) and the rolling reduction was changed, the rolling reduction was insufficient at a rolling reduction of 17.5%. No adhesive strength, 45% reduction
In this case, the hardness after joining of titanium and stainless steel was too high due to work hardening, so that drawing was difficult. From this fact, it has been found that the rolling reduction is suitably in the range of 20 to 40%. In this case, titanium-
For a two-layer structure of aluminum and a three-layer structure of titanium-aluminum-titanium and titanium-aluminum-stainless steel, a rolling reduction of 25% is obtained, and for titanium-aluminum-iron, a rolling reduction of 37.5% gives the best results. Was. The reason for such a difference is presumed to be that an oxide film was formed on iron, and it was necessary to increase the rolling reduction and thereby increase the adhesive strength. B. At 450 ° C, the formation of an alloy layer was observed at a part of the bonding interface, and at 350 ° C, the bonding strength tended to be insufficient due to insufficient temperature. Thus, from this fact, the heat holding temperature of aluminum is 3
70-430 ° C has been found to be suitable. C. If the coating temperature of titanium, stainless steel, or iron is 120 ° C, the bonding strength becomes inappropriate due to insufficient temperature, and if it is 250 ° C, the generated oxide film disturbs the bonding strength and becomes poor. Thus, from this fact, the coating material "Titanium
It has been found that the heating and holding temperature of “stainless steel / iron” is suitably 150 to 240 ° C. D. As for the diffusion annealing temperature after joining by rolling, at 450 ° C, an alloy layer is seen at a part of the bonding interface, and at 300 ° C, the work-hardened excessive hardness of the coating titanium, stainless steel, and iron is softened. No effect was obtained, and no improvement in adhesive strength due to the diffusion effect was observed. From this fact, it was found that the optimum diffusion annealing temperature in the method of the present invention was 350 to 430 ° C. The method of the present invention utilizes new knowledge obtained through the above-mentioned rolling test, and this new knowledge has been completed as a technology for rationally manufacturing a material for titanium clad equipment having aluminum as a base layer. It is.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Preferred embodiments of the present invention will be described in more detail. In FIG. 1, reference numeral 1 denotes an aluminum plate on which a mother layer is to be formed, reference numeral 2 denotes a first coating metal plate disposed on the front side of the aluminum plate 1, and reference numeral 3 denotes a back side of the aluminum plate 1. It is a 2nd coating metal plate arrange | positioned at.
In the first to third embodiments described below, as shown in FIG. 2, a first coating metal plate 2 is disposed on the front side of an aluminum plate 1 and a second coating metal plate is disposed on the back side of the aluminum plate 1. The metal plates 3 are arranged and stacked. In this case, the opposing surfaces of the aluminum plate 1 and the first and second coating metal plates 2 and 3 to be joined are completely cleaned by a degreasing cleaning process and a wire buff polishing, and rolling is started. Side of the aluminum plate 1 on the side and the first and second coating metal plates 2.
The edges of 3 are aligned and subjected to hot rolling. The heating and holding conditions, the pressing force, and the rolling speed at this time are items that are appropriately set according to the types of the coated metal plates 2.3 selected in the first to third embodiments.

[First Embodiment] In the first embodiment, an aluminum plate (JIS H 4000 A1100) 1 of 2.5 mm (thickness) x 370 mm (width) x 885 mm (length) is heated at 400 ° C in a heating furnace. While the first coating metal plate 2 and the second coating metal plate 3 are 0.3 mm (thickness) × 370 mm (width) × 1000 mm
(Length) two pure titanium plates (JIS H 4600 TP 270C), each of which was heated and held at 200 ° C. in a heating furnace, and the aluminum plate 1, the first coating metal plate 2 and the second (2) The metal sheet for coating 3 was taken out of each of the furnaces, stacked in a state as shown in FIG. 2, and immediately passed through a roll device so as not to cool down, and rolled at a rolling reduction of 25.8%. As a result, the metal plates 2.1, 3.3 stacked in the above state are joined and integrated, and as shown in FIG. 3, pure titanium is coated on the upper side with the aluminum base layer 11 (thickness = 1.8 mm) interposed therebetween. Layer 21 (thickness =
0.25 mm), and a titanium-aluminum-titanium clad metal plate having a pure titanium coating layer 31 (thickness = 0.25 mm) on the lower side was obtained. The overall size of this clad metal plate is 2.3mm
(Thickness) × 370 mm (width) × ≒ 1100 mm (length).

The clad metal sheet produced as described above was further subjected to a diffusion annealing treatment at 400 ° C. As a result, the pure titanium layers 21 and 31 had a hardness of Hv 145 to 151, and the aluminum layer 11 had a hardness of Hv 24 to 25.1, and had physical properties that facilitated drawing of cooking utensils.
However, the material for the clad object of the first embodiment includes:
No electromagnetic heating performance.

[Second Embodiment] In the second embodiment, an aluminum plate (JIS H 4000 A1100) 1 of 2.0 mm (thickness) x 370 mm (width) x 725 mm (length) is placed in a heating furnace at 400 ° C. While the first coating metal plate 2 is 0.5 mm
(Thickness) x 370mm (width) x 1000mm (length) pure titanium plate (JI
SH 4600 TP 270C) and 0.5 mm (thickness) x 370 mm (width) x 1000 mm (length) stainless steel (JIS G 4304 SUS430) as the second coating metal plate 3 Is kept at 200 ° C. in a heating furnace, and the aluminum plate 1, the first coating metal plate 2, and the second coating metal plate 3 are taken out of each of the furnaces and stacked in a state as shown in FIG. Weight
Each of them was immediately passed through a roll device so as not to be cooled down, and rolled at a rolling reduction of 23.3%. As a result, the metal plates 2.1, 3.3 stacked in the above state are joined and integrated, and as shown in FIG. 3, pure titanium is coated on the upper side with the aluminum base layer 11 (thickness = 1.42 mm) interposed therebetween. A titanium-aluminum-stainless steel clad metal plate having a layer 21 (thickness = 0.45 mm) and a stainless steel coating layer 31 (thickness = 0.43 mm) on the lower side was obtained. The overall size of the clad metal plate was 2.3 mm (thickness) × 370 mm (width) × ≒ 1100 mm (length).

The clad metal sheet produced as described above was further subjected to a diffusion annealing treatment at 400 ° C. as a result,
The pure titanium layer 21 has a hardness of Hv 129 to 136, the aluminum layer 11 has a hardness of Hv 22.8 to 25.7, and the hardness of the stainless steel layer 31 has a hardness of Hv 210 to 218. It has electromagnetic heating performance.

Third Embodiment In the third embodiment, an aluminum plate (JIS H 4000 A1100) 1 of 2.2 mm (thickness) × 370 mm (width) × 800 mm (length) is placed in a heating furnace at 400 ° C. While the first coating metal plate 2 is 0.5 cm
(Thickness) x 370mm (width) x 1000mm (length) pure titanium plate (JI
SH 4600 TP 270C) and a 0.5 mm (thickness) x 370 mm (width) x 1000 mm (length) iron (J
IS G 3141 SPCE) in a heating furnace.
C., and the aluminum plate 1, the first coating metal plate 2 and the second coating metal plate 3 were taken out of each of the furnaces and stacked in the state shown in FIG. Immediately pass through the roll device to prevent cooling
Rolled. As a result, the metal plates 2.1, 3.3 stacked in the above state are joined and integrated, and as shown in FIG. 3, pure titanium is coated on the upper side with the aluminum base layer 11 (thickness = 1.42 mm) interposed therebetween. A titanium-aluminum-iron clad metal plate having a layer 21 (thickness = 0.43 mm) and an iron coating layer 31 (thickness = 0.40 mm) below was obtained. The overall size of this clad metal plate is 2.25mm (thickness) × 370mm (width) × ≒ 1100mm (length)
Met.

The clad metal sheet produced as described above was further subjected to a diffusion annealing treatment at 400 ° C. as a result,
The hardness of the pure titanium layer 21 is Hv 130 to 150, the hardness of the aluminum layer 11 is Hv 19 to 24, and the hardness of the iron layer 31 is Hv.
It had a hardness of v146, and had physical properties and electromagnetic heating performance that facilitated drawing of cooking utensils.

The embodiments of the present invention illustrated as specific examples in the specification and the drawings are generally as described above. However, the present invention is not limited to the above-described embodiments, and is not limited thereto. Various modifications are included in the description of "."

For example, in the above embodiment, an example was given in which pure titanium was used as the metal material for coating. However, when a material having a high surface hardness is required as a material for cladding equipment, a titanium alloy is used. It is preferable that such modifications are within the technical scope of the present invention.

[0028]

As described above with reference to the specific seven embodiments, the three layers and the two layers provided by the method of the present invention are provided.
The layer of titanium clad material, if the container is molded so that the titanium layer side is located on the cooking surface, the titanium layer has excellent thermal conductivity due to the aluminum layer, so the thermal efficiency is very good In addition to the fact that the titanium layer serves as the cooking surface, it is rich in lubricity and can keep the inside clean without burning the food, and if oil, fat, salt, soy sauce, etc. Even if the seasoning adheres, a practical advantage is obtained such that it can be easily dropped and wiped off with a cloth or paper to keep the storage surface sanitary.

Further, when it is necessary to produce a vessel material for use in an electromagnetic cooker according to the method of the present invention, it is only necessary to use stainless steel or iron which is a magnetic substance as one of the coating metal materials. In addition, since an electromagnetic heating function is provided, the usability is further improved in combination with the lightness of the electromagnetic cooker today.

Therefore, in the method of the present invention, the process of pressurizing under the specific conditions is performed by skillfully combining the conditions for holding and heating aluminum, the conditions for holding and heating the coated metal material, and the rolling reduction of the rolling process. The metallurgical joining can be performed in one pass, and the joining strength of the constituent metal layers is extremely high.

As described above, according to the present invention, it is possible to extremely efficiently produce an ideal clad material for a vessel made of pure titanium.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view for explaining a combination of an aluminum plate used in first to third embodiments and first and second coating metal plates.

FIG. 2 is a perspective view of a state in which an aluminum plate is disposed in the middle, a first coating metal plate is disposed on the front side, and a second metal plate is disposed on the back side and stacked.

FIG. 3 is an explanatory perspective view of a state in which each metal plate stacked in the state of FIG. 2 is subjected to rolling and metallurgically joined and integrated;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Aluminum plate 2 First coating metal plate 3 Second coating metal plate 11 Aluminum layer (base layer) 21.31 Coating layer (pure titanium layer, stainless steel layer, iron layer)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A47J 37/10 A47J 37/10 F-term (Reference) 4B055 AA01 BA15 BA22 BA29 BA35 BA56 BA63 CA01 FA01 FB02 FB03 FB04 FB05 FC08 FD06 FE04 4B059 AA01 AA02 AA03 AA04 AA08 BB01 CA02 CA12 4E067 AA02 AA03 AA05 AA12 BA03 BD03 DC06 DC07 DD01 EA00 EB11 EC03

Claims (2)

[Claims] 1. A three-layer structure in which aluminum is used as a base layer, and titanium is deposited on one surface of the base layer, and titanium, stainless steel, or iron is deposited on the other surface of the base layer. In producing titanium clad equipment material,
While holding the aluminum at 370 to 430 ° C. for forming the mother layer, the titanium to be coated on both sides of this aluminum, and the stainless steel or iron at 150 to 240 ° C., these metal materials are titanium-aluminum- Titanium, or titanium-aluminum-stainless steel, or titanium-aluminum-iron, superimposed in sequence and rolled in one pass at a rolling reduction of 20-40% to join them together, followed by diffusion annealing at 350-430 ° C A method for producing a material for titanium clad objects having aluminum as a base layer, the method comprising: 2. A method for producing a two-layer titanium clad material having titanium as a base layer and one surface of which is coated with titanium, wherein aluminum to form the base layer is 370-430 ° C. The titanium material to be coated on one side of this aluminum is heated and maintained at 150 to 240 ° C., and the two metal materials are rolled up in a single pass at a rolling reduction of 20 to 40% in a single pass of titanium-aluminum. A method for manufacturing a material for a clad object having aluminum as a base layer, wherein the material is joined integrally by diffusion bonding, and then diffusion annealing is performed at 350 to 430 ° C.