JP2003033277A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooker such as a frying pan which has stable strength after long period use and can most suitably and easily cook foodstuffs. SOLUTION: This frying pan (cooker) 1 is constituted of the main body (casting) 2 made of a titanium alloy which consists of Ti-6 wt.%, Al-4 wt.%, and V. The bottom part 4 is made thicker than the side wall part 6 and a part near the attaching part 5 of the handle 9 on the relating side wall part 5 is similarly made thicker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker made of titanium or titanium alloy which is applied to, for example, a frying pan or a wok.

[0002]

2. Description of the Related Art Conventionally, frying pans and woks made of pressed steel sheets have long been used. by the way,
In recent years, titanium frying pans that are lighter in weight than iron (steel) and have a faster temperature rising rate and excellent heat retention properties are commercially available. That is, the weight of pure titanium is about 60% of iron, the heat capacity is about 60% of iron, and the thermal conductivity is about 1/4. However, since the strength of pure titanium is about 50% that of iron, for example, if a thin plate made of pure titanium and having a thickness of 1.2 mm is formed into a predetermined shape by a press or the like and used as a frying pan or a wok, it will be used for many years. There was a problem that the vicinity of the attachment part of the handle was deformed by the impact.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the problems in the prior art described above, has a stable strength even after long-term use, and has a frying pan or the like that can cook foodstuffs optimally and easily. The challenge is to provide a cooking device.

[0004]

In order to solve the above-mentioned problems, the present invention was conceived to apply a casting material made of titanium or a titanium alloy and having a changed thickness to a cooking device. is there. That is, the cooker of the present invention (claim 1)
Is made of a cast material of titanium or titanium alloy, and at least the thickness of the bottom is thicker than that of the side wall. According to this, since titanium or titanium alloy having a smaller heat capacity and thermal conductivity than iron is used and the thickness of the bottom portion is made thicker than the side wall portion by the cast material, it is mounted on the inner surface of the bottom portion. The food ingredients are not heated rapidly and are heated uniformly. Therefore, desired cooking can be freely performed without burning the food.

Moreover, since a cast material having a bottom portion thicker than that of the side wall portion is used, the weight is not excessive and the user is not fatigued. Can maintain strength (rigidity). still,
The cooking device of the present invention includes a frying pan and a wok (including a Charlene pot) described later, as well as a double-handed pot, a single-handed pot, a deep pot, a mallet pot, a snowy pot, an oden pot, a milk pan, and the like.

The present invention also includes a cooker (claim 2) in which the difference between the thickness of the bottom portion and the thickness of the side wall portion is 0.3 mm or more. According to this, for example, when the thickness of the side wall is 1.2 mm, the thickness of the bottom is 1.5 mm.
.About.2.0 mm, which makes it possible to more reliably cook the foodstuff on the inner surface of the bottom portion while heating it uniformly without burning. The thickness difference of 0.3 mm or more means that at the bottom where the difference is less than 0.3 mm, the thickness approaches the thickness of the side wall, and there is a risk that the food material is overheated and burned. Excluded range. In addition, the upper limit of the thickness of the bottom is not particularly limited, but is practically around 2 mm.

Further, according to the present invention, at least an inner surface of the bottom portion is provided with minute projections and oil grooves located around them, or a plurality of continuous unevenness is provided on the outer surface of the bottom portion. Also included is a cooker (claim 3) that is arranged. According to this, in the form in which the minute projections are formed on the inner surface of the bottom and the oil grooves are formed around these, the cooking oil permeates the oil grooves and is held in the form of an oil film. It becomes easy to perform appropriately and stably. That is, in conventional pots made by pressing a thin plate made of titanium, shot blasting was applied to the inner surface of the pan to roughen the ground, but since the minute dents due to such blasting are shallow, an oil groove that can form an oil film should be obtained. I couldn't. On the other hand, since the minute projections integrally formed on the surface by the casting material can have a height of at least 10 μm or more (for example, 30 to 100 μm), it is possible to form oil grooves of the same depth around them. it can.

On the other hand, in the form in which a plurality of unevennesses are integrally formed on the outer surface of the bottom portion, the heat transfer area is expanded to increase the heating speed of foodstuffs, the flexibility of the cooking method is expanded, and the weight of the entire cooking device is reduced. Rigidity (strength) can be increased without increasing too much. The plurality of irregularities include, for example, a shape in which concentric circles or radiation are drawn in a plan view, and the depth between adjacent concave and convex portions is 200 μm or more (for example, 300 μm).
m). In addition, the thickness of the bottom portion at the position of the recess is set to be equal to or greater than that of the side wall portion. Furthermore,
The protrusions on the inner surface of the bottom and the irregularities on the outer surface can be used together in one cooking device.

Further, the present invention also includes a cooking device (claim 4) in which the vicinity of the attachment portion of the handle on the side wall portion as well as the bottom portion is thick. According to this, in a cooker that cooks foodstuffs with a cooking utensil held in one hand and swinging while holding it in the other hand, such as a frying pan or wok, it is possible to easily reduce the impact applied to the vicinity of the attachment part of the holding hand. can do. Further, even when a cooker containing foodstuffs and a large amount of hot water, such as a pot, is carried from the heating source to another place, the deformation of the vicinity of the attachment part of the handle can be prevented. Therefore, even if it is used for many years, local deformation does not occur and it can be utilized for cooking with confidence.

In addition, according to the present invention, the titanium alloy is
Ti-6 wt% Al-4 wt% V, Ti-3 wt% Al-2.
Also included is a cooker (claim 5) which is either 5 wt% V or Ti-22 wt% V-4 wt% Al. According to this, for example, a titanium alloy of Ti-6 wt% Al-4 wt% V has a heat capacity and a specific heat equivalent to those of pure titanium, but has a thermal conductivity of half or less (pure titanium: 17.1 W / m · ° C.). , The above titanium alloy: 7.1 W / m · ° C). Therefore, the heat retaining property of the heated food material is further enhanced, and the food material can be easily cooked in a desired state while being uniformly heated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing a frying pan (cooking device) 1 according to the present invention. The frying pan 1 is a titanium alloy (Ti-6 wt% Al-4 wt% V).
It has a main body 2 made of a cast material and a wooden handle 9 protruding from the outside through a metal fitting 8. Body (casting material) 2
As shown in FIGS. 1 (A) and 1 (B), is provided with a circular and relatively thick bottom portion 4 and a relatively thin side wall portion 6 which is obliquely curved from the periphery thereof and stands upright. Part 1 of FIG. 1 (A)
The vicinity 5 of the attachment portion for fixing the metal fitting 8 of the handle 9 indicated by the broken line is thick like the bottom portion 4. The metal fitting 8 is attached to the mounting position of the main body 2 (the mounting portion 5 of the handle 9).
It is fixed to the vicinity) by welding or rivets.

That is, in the main body 2, the vicinity of the bottom portion 4 and the attaching portion 5 of the handle 9 surrounded by the broken line in FIG. 1 (A) has a thickness of 1.5 to 1.8 mm. Side wall portion 6 outside the broken line in FIG. 1 (A) excluding the vicinity
Is integrally cast with a thickness of 1.2 mm. In the main body 2 as described above, the thick bottom portion 4 and the vicinity of the attachment portion 5 of the handle 9 and the thin side wall portion 6 are integrally formed by the vacuum suction casting method described later.

Further, as shown in FIG. 2A in which the one-dot chain line portion a in FIG. 1B is enlarged, the inner surface of the bottom portion 4 of the main body 2 has a height of at least 10 μm (for example, 50 μm or more).
A large number of microscopic projections 4a, each having a size of .mu.m, are projected at substantially equal intervals to form projection groups 4a, 4a, .... The oil grooves r, r, ... Of the same depth as the height are formed around the projection groups 4a, 4a ,. Cooking oil permeates into the oil groove r to form an oil film. Further, as shown in FIG. 2 (A), the outer surface of the bottom portion 4 of the main body 2 is provided with a plurality of irregularities 4b composed of convex portions 4c and concave portions 4d which are concentrically and alternately continuous from the center of the bottom portion 4. Has been formed. The depth between the convex portion 4c and the concave portion 4d is 200 μm or more (for example, 300 μm), and the thickness of the bottom portion 4 at the position of the concave portion 4d is equal to or greater than that of the side wall portion 6.

FIG. 2B shows a method of casting the main body 2 having the thick bottom portion 4 and the mounting portion 5 of the handle 9 and the thin side wall portion 6. As shown in FIG. 2 (B), an upper mold 10a and a lower mold 10 formed by molding a breathable resin sand.
A cavity 12 having a shape similar to that of the main body 2 is previously formed in a mold 10 made of b. A plurality of runners 13 branched from a sprue 14 in a vertical portion 15 hanging from the lower mold 10b communicate with the cavity 12. Mold 1
2 is inserted into a box-shaped chamber 16 having an open bottom and fixed on the outer peripheral surface of the mold 10, as shown in FIG. 2 (B).

The chamber 13 can be raised and lowered by a not-shown raising and lowering means, and an exhaust hole 17 provided on the ceiling surface thereof.
Communicates with a pressure reducing means such as a vacuum pump (not shown). In addition, between the mold 10 and the ceiling surface of the chamber 13,
Space S is located. As shown in FIG. 2 (B), the mold 1
The chamber 16 holding 0 is surrounded by a high frequency coil 19
Is lowered onto the induction heating furnace 18 around which
The vertical portion 15 of the mold 10 having the sprue 14 therein is immersed in the melt M of the titanium alloy previously melted inside. In this state, the decompression means is operated to decompress the space S and the cavity 12 in the chamber 13. Then, the molten metal M in the induction heating furnace 18 rises through the sprue 14 and each runner 13 and is filled in the cavity 12 in the mold 10.

When the depressurized state is maintained for a certain period of time, the molten metal M
Solidify in the cavity 12. After releasing the depressurized state, the chamber 1 is moved away from the heating furnace 18.
Remove the mold 10 from 6 and separate the mold. As a result, as shown in FIGS. 1 (A) and 1 (B), the thick bottom portion 4 is formed.
Further, the main body 2 made of a cast material, which integrally includes the vicinity of the mounting portion 5 of the handle 9 and the thin side wall portion 6, is obtained. still,
In the upper mold 10a of the mold 10, a similar group of depressions forming the projections 4a, 4a, ... Is provided on the flat surface forming the cavity 12, and on the flat surface forming the cavity 12 in the lower mold 10b, You may form many recessed parts and convex parts which form the said several unevenness 4b by turns.

The frying pan (cooking device) of the present invention as described above
According to 1, the bottom part 4 and the vicinity 5 of the attachment part of the handle 9
Since the main body 2 is a cast material made of titanium alloy having a large wall thickness and a thin side wall portion 6, the food material placed on the inner surface of the bottom portion 4 is not heated rapidly but is uniformly heated. As a result, desired cooking can be easily performed without burning the food material. Moreover, since the vicinity 5 of the attachment portion of the handle 9 is also thick, even if the handle 9 is held with one hand while swinging the main body 2 on the heating source, local deformation can be prevented.

Further, since the side wall portion 6 is thin, the weight of the frying pan 1 as a whole does not become excessive and does not cause fatigue to the user, and it has an appropriate strength (rigidity) without being deformed even if it is used for many years. Can be kept. Further, on the inner surface of the bottom portion 4, an oil groove r surrounded by minute projection groups 4a, 4a ,.
Cooking water permeates into r, ... And is maintained as an oil film, so that the food can be cooked without burning. In addition, since the plurality of irregularities 4b are provided on the outer surface of the bottom portion, it is possible to increase the heat transfer area and the heating efficiency while increasing the overall rigidity (strength). The projection group 4a and the oil groove r may be formed on the inner side surface of the side wall portion 6. Further, in FIG. 1A, the width of the attachment portion 5 of the handle 9 having a thick wall may be narrowed.

FIG. 3 shows a wok (cooker) 20 according to the present invention.
Regarding As shown in the plan view of FIG. 3 (A), this wok 20 has a circular main body 2 made of the above-mentioned titanium alloy casting material.
2 and a pair of handles 28, which are U-shaped and project symmetrically on the outside thereof. The main body (cast material) 22 is shown in FIG.
As shown in (A) to (C), a relatively thick bottom portion 24 that becomes thicker toward the deepest portion, and a relatively thin sidewall that curves continuously around the bottom portion 24 and becomes thinner toward the outer peripheral edge. A portion 26 and a portion 25 of the side wall portion 26 near the mounting portion of the handles 28, 28 that are thick like the bottom portion 24;
Consists of.

That is, as shown in FIG. 3 (C), the bottom portion 24 and the mounting portion vicinity 25 of the handle 28 sandwiched between a pair of curved upper and lower broken lines in FIG. The side wall portion 26 located above and below the broken line is thin as shown in FIG. 3 (B). In the wok 20, the boundary between the bottom portion 24 and the side wall portion 26 is not clear, and the deepest portion of the bottom portion 24 is the thickest, for example, 2 mm.
As it approaches 6, the thickness gradually decreases. In addition, the side wall 2
6 is also thicker toward the bottom 24 and has the thinnest outer peripheral edge,
For example, it is 1.2 mm.

The main body 22 of the wok 20 is also shown in FIG.
As shown in (B), by the vacuum suction casting method using the mold 10 in which the cavity having the shape following the main body 22 is provided, the chamber 16, and the molten metal M of the titanium alloy,
It can be integrally formed. According to the wok (cooking device) 20 as described above, since the bottom portion 24 and the vicinity of the attachment portion 25 of the handle 28 are the thick-walled main body 22 made of titanium alloy and the side wall portion 26 is the thin-walled titanium alloy, Since the foodstuffs are not rapidly heated and are uniformly heated, desired foodstuffs can be easily cooked without burning the foodstuffs.

Further, since the vicinity 25 of the attaching portion of the handle 28 is also thick, even if the main body 22 is swung on the heat source and the handle 28 is held with one hand, local deformation can be prevented. Furthermore, since the side wall portion 26 is thin, the whole wok 20 is not overloaded and does not cause fatigue to the user, and it is possible to maintain proper strength (rigidity) without being deformed even after long-term use. . The inner surface of the bottom portion 24 or the bottom portion 2
4 and the inner surface of the side wall portion 26, the minute projection groups 4a, 4
, and the oil grooves r, r, ... Surrounded by these may be provided. Further, on the outer surface of the bottom portion 24, the convex portions 4c and the concave portions 4d forming the plurality of irregularities 4b may be alternately formed in a concentric circular shape or a radial shape.

FIGS. 4A and 4B show a wok 20a which is a modified form of the wok 20 described above. The wok 20a also has a circular main body 22a made of the titanium alloy casting material, and a pair of U-shaped handles 28, 28 protruding symmetrically on the outside thereof.
Consists of. As shown in the vertical cross-sectional view of FIG. 4 (A) and the bottom view of FIG. 4 (B), the main body (cast material) 22a is continuous with a relatively thick bottom portion 24a and the periphery of the bottom portion 24a. Curved comparatively thin side wall portion 26a and the side wall portion 2
6a, the handle portions 28, 28 having the same thickness as the bottom portion 24a and the vicinity 25, 25 of the attachment portion of the handles 28, 28 are formed.
The bottom portion 24a has a constant thickness of 1.8 mm and the side wall portion 26
The thickness of a is 1.2 mm and is constant. Therefore, in FIG.
As shown in (A), a step 27 having the above-mentioned thickness is located at the boundary between the bottom portion 24a and the side wall portion 26a.

Further, as shown in FIG. 4B, the bottom portion 24a
The mounting portion 25 of the handle 28 extends from the to the handle 28 in a thickness similar to that of the bottom portion 24a. Similar to the wok 20 described above, the wok 20a as described above can uniformly heat the food without rapid heating, can easily perform desired cooking of the food, can prevent local deformation, and can be used for a long time. The proper strength (rigidity) can be maintained throughout. A step 27 is formed between the bottom portion 24a and the side wall portion 26a.
Is located, it becomes easy to mold the mold 10 in which the cavity having the shape is provided. Also, the bottom 24a
The minute projections 4a and the oil grooves r may be formed on the inner surface of the bottom surface, or the plurality of irregularities 4b may be formed on the outer surface of the bottom portion 24a.

The present invention is not limited to each of the forms described above. The main body 2 of the frying pan 1 and the main bodies 22, 22a of the woks 20, 20a are made of pure titanium or the titanium alloy (Ti-6 wt% Al-4 wt% V,
Ti-3 wt% Al-2.5 wt% V, Ti-22 wt% V-
4 wt% Al) and various other titanium alloys (α
Type, α + β type, or β type) can also be applied. Further, in the main body (cast material) 2, 22, 22a, the side wall portion 6, which is adjacent to the relatively thick bottom portions 4, 24, 24a,
The thick portions similar to the bottom portion 4 may be extended to the portions of the 26, 26a near the bottom portions 4, 24, 24a. Further, the bottom portions 4, 24, 24a and the side wall portions 6,
The inner surface of 26, 26a may be left as the casting surface by the casting method, and the surface of the casting surface may be coated with a known fluororesin coating (trade name: Teflon).

[0026]

According to the cooker of the present invention described above (claim 1), titanium or titanium alloy having a smaller heat capacity and lower thermal conductivity than iron is used, and the thickness of the bottom portion is made to be the side wall portion by the casting material. Since it is thicker than the above, it is possible to uniformly heat the food placed on the inner surface of the bottom without rapidly heating it. As a result, the desired food can be freely cooked without burning the food. Moreover, since a cast material with a thicker bottom portion than the side wall portion is used, the weight does not become excessive and does not cause fatigue to the user. ) Can be kept.

According to the cooker of the second aspect, cooking can be performed more reliably without heating the food on the inner surface of the thick bottom portion. Further, according to the cooker of claim 3, in the form in which the minute projections and the oil grooves are formed around these, the cooking oil permeates into the oil grooves and is held in the form of an oil film. It becomes easy to cook the food properly and stably. On the other hand, in the case of forming the concavities and convexities, the heat transfer area is increased, the heating rate of the food material is increased, the cooking method is expanded, and the rigidity (strength) can be increased without significantly increasing the weight of the entire cooking device.

According to the cooking device of claim 4, in the cooking device which cooks the food with the cooking utensil held in one hand and swinging while grasping in the other hand, the impact applied to the vicinity of the attaching part of the holding hand, etc. Can be eased easily. Therefore, even if it is used for a long period of time, local deformation does not occur, and it can be utilized for cooking with peace of mind. In addition, according to the cooker of claim 5, since the heat capacity and the specific heat are equal to those of pure titanium, but the thermal conductivity is half or less, the heat retention property of the heated food material is further enhanced, and uniform heating is achieved. While doing so, it becomes possible to easily cook the food material in a desired state.

[Brief description of drawings]

FIG. 1A is a plan view of a frying pan that is a cooking device of the present invention, and FIG. 1B is a cross-sectional view taken along the line BB in FIG.

FIG. 2A is an enlarged view of a one-dot chain line portion a in FIG.
FIG. 2B is a schematic view showing a process of casting the main body of the frying pan of FIG. 1.

FIG. 3 (A) is a plan view of a wok which is a cooking device of the present invention.
(B), (C) is sectional drawing in the viewing angle along the BB line or CC line in (A).

4A is a vertical sectional view showing a modified form of the wok shown in FIG. 3, and FIG. 4B is a bottom view of the wok shown in FIG.

[Explanation of symbols]

1 ………………………… Frying pan (cooker) 2,22,22a ... Main body (cast material) 4, 24, 24a ... Bottom 4a …………………… Protrusions (projections group) 4b …………………… Asperity 6, 26, 26a ... Side wall 5,25 ……………… Around the attachment part of the handle 9,28 ……………… Handle 20, 20a ………… Wok (cooker) r ………………………… Oil groove

Claims (5)

[Claims] 1. A cooking device comprising a cast material of titanium or a titanium alloy, wherein at least a bottom portion has a larger thickness than a side wall portion. 2. The difference between the thickness of the bottom portion and the thickness of the side wall portion is
It is 0.3 mm or more, The cooker of Claim 1 characterized by the above-mentioned. 3. At least an inner surface of the bottom portion is provided with a small group of protrusions and an oil groove located around these, or
Alternatively, the cooker according to claim 1 or 2, wherein a plurality of continuous irregularities are arranged on an outer surface of the bottom portion. 4. The cooker according to any one of claims 1 to 3, wherein not only the bottom portion but also the attachment portion of the handle on the side wall portion is thick. 5. The titanium alloy is Ti-6 wt% Al-4.
wt% V, Ti-3 wt% Al-2.5 wt% V, or Ti
It is any one of -22wt% V-4wt% Al, The cooker as described in any one of Claim 1 thru | or 4 characterized by the above-mentioned.