CN111774809B

CN111774809B - Method for manufacturing pot and pot

Info

Publication number: CN111774809B
Application number: CN201910271738.4A
Authority: CN
Inventors: 吴慧民; 邢凤雷; 许智波; 姚亮; 王婷
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2022-04-08
Anticipated expiration: 2039-04-04
Also published as: CN111774809A

Abstract

The invention discloses a cookware and a manufacturing method thereof, wherein the cookware comprises a cookware body, a composite bottom and a protective layer, and the manufacturing method comprises the following steps: obtaining a cookware body and a composite bottom; mounting the composite bottom on the outer surface of the cookware body, and arranging brazing materials between the composite bottom and the cookware body; nitriding to form a nitriding layer on at least one of the inner surface and the outer surface of the cookware body with the double bottom, wherein the protective layer comprises the nitriding layer; carrying out brazing treatment on the pot to melt brazing materials; and cooling the pot to cool the molten brazing material so as to connect the composite bottom and the pot body. According to the manufacturing method of the pot provided by the embodiment of the invention, the composite bottom is not easy to separate from the pot body, the connection is firmer, and the manufactured pot has good antirust performance, longer service life, uniform heat conduction and difficult deformation, and is beneficial to reducing the generation of oil smoke.

Description

Method for manufacturing pot and pot

Technical Field

The invention relates to the technical field of cookware, in particular to a cookware and a manufacturing method thereof.

Background

In the correlation technique, the pan is made for individual layer iron plate or steel sheet, and individual layer iron plate or steel sheet are thinner to heat conductivility is poor, has the problem such as heat conduction inhomogeneous, easy deformation and easy production oil smoke after the heating, and the product quality is lower, and user experience is relatively poor.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for manufacturing a cookware, which can manufacture cookware with a composite bottom and a protective layer, wherein the composite bottom is not easy to separate from the cookware body, and the cookware structure is more reliable.

Another object of the present invention is to provide a pot.

According to the manufacturing method of the cooker provided by the embodiment of the first aspect of the invention, the cooker comprises a cooker body, a composite bottom and a protective layer, and the manufacturing method comprises the following steps: obtaining the cookware body and the composite bottom; mounting the composite bottom on the outer surface of the cookware body and arranging brazing materials between the composite bottom and the cookware body; nitriding to form a nitriding layer on at least one of the inner surface and the outer surface of the cookware body provided with the composite bottom, wherein the protective layer comprises the nitriding layer; carrying out brazing treatment on the pot to enable the brazing material to be molten; and cooling the pot to enable the molten brazing material to be cooled so as to connect the composite bottom and the pot body.

According to the manufacturing method of the cookware, the composite bottom is not easy to separate from the cookware body, the connection is firmer, and the manufactured cookware has the composite bottom and the protective layer, is uniform in heat conduction, not easy to deform, more reliable in structure, beneficial to reducing the generation of oil smoke, safer to use, good in antirust performance and longer in service life.

In addition, the manufacturing method of the pot according to the above embodiment of the present invention may further have the following additional technical features:

according to the manufacturing method of the pot tool provided by the embodiment of the invention, the nitriding treatment is carried out at the temperature of T1, the brazing treatment is carried out at the temperature of T2, the melting temperature of the brazing material is T3, wherein T1 is more than T3 and is less than or equal to T2.

According to the manufacturing method of the pot tool provided by the invention, T1 is more than or equal to 500 ℃ and less than or equal to 580 ℃; and/or T2 is more than or equal to 620 ℃ and less than or equal to 700 ℃; and/or T3 is more than or equal to 620 ℃ and less than or equal to 700 ℃.

According to some embodiments of the invention, the step of installing the composite bottom on the outer surface of the pot body and providing the brazing material further comprises: connecting the double bottom with the cookware body and forming an accommodating cavity between the double bottom and the cookware body; disposing the brazing material within the containment cavity.

In some embodiments of the present invention, the accommodating cavity is disposed in a closed manner, before the double bottom is mounted on the pot body, or after the double bottom is mounted on the pot body and before the brazing material is disposed in the accommodating cavity, a through hole communicating with the accommodating cavity is formed in the double bottom, and the brazing material enters the accommodating cavity through the through hole.

According to a further embodiment of the invention, the through hole is sealed after the brazing material is arranged in the receiving cavity.

According to some embodiments of the invention, the nitriding treatment and the brazing treatment are performed in the same treatment device; and/or after the nitriding treatment is finished, carrying out temperature rise treatment to enable the pot to reach the temperature T2, wherein the temperature rise time is T, and T is less than or equal to 30 min.

Optionally, the brazing material is in powder or paste form; and/or the maximum filling thickness of the brazing material is L, wherein L is more than or equal to 2mm and less than or equal to 10 mm; and/or the size of the composite bottom extending in the axial direction of the cookware body is H, the axial size of the cookware body is H when the protective layer is not arranged, and H is less than or equal to H/2

In some embodiments of the invention, when the double bottom is mounted on the outer surface of the cookware body, the double bottom and the cookware body are connected in a welding manner, and a positioning device is adopted to position the relative position of the double bottom and the cookware body.

In some embodiments of the invention, the cookware body is made of at least one of a steel material and a ferrous material, the composite bottom is made of a magnetic conductive material, and at least one part of the lower surface of the composite bottom is a plane in contact with the placement surface; and/or the braze material comprises at least one of silver, copper, zinc, cadmium, tin, silicon, nickel, manganese; and/or the composite bottom and the cooker body are both made of iron materials.

The cookware according to the second aspect of the invention is manufactured by the manufacturing method of the cookware according to the embodiment of the invention.

A cooker according to a third aspect of the present invention includes: a pot body; the double bottom is connected with the cooker body, and an accommodating cavity is formed between the double bottom and the cooker body; the protective layer comprises a nitriding layer, and the nitriding layer is arranged on at least one of the inner surface and the outer surface of the cookware body; the brazing material layer is arranged in the containing cavity to be connected with the composite bottom and the cooker body.

Furthermore, the protective layer is arranged on the outer surface of the cookware body and covers the outer surface of the composite bottom; and/or the maximum filling thickness of the brazing material layer is L, wherein L is more than or equal to 2mm and less than or equal to 10 mm; and/or the size of the composite bottom extending in the axial direction of the cookware body is H, the axial size of the cookware without the protective layer is H, and H is less than or equal to H/2; and/or the cookware body is made of at least one of steel materials and iron materials, the composite bottom is made of magnetic conductive materials, and at least one part of the lower surface of the composite bottom is a plane in contact with the placement surface; and/or the brazing material comprises at least one of silver, copper, zinc, cadmium, tin, silicon, nickel, manganese.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flow chart of a method of manufacturing a pot according to an embodiment of the present invention;

fig. 2 is an exploded view of a pot body and a double bottom of the pot according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of the double bottom of the pot mounted on the pot body according to the embodiment of the invention;

FIG. 4 is a schematic structural diagram of a pot body and a composite bottom of the pot provided with brazing materials according to the embodiment of the invention;

FIG. 5 is a schematic structural view of a cookware according to an embodiment of the present invention;

FIG. 6 is an enlarged schematic view of FIG. 5 at circle A;

fig. 7 is a flow chart of a method of manufacturing a pot according to an embodiment of the present invention.

Reference numerals:

a pot 100;

a pot body 10;

a compound bottom 20; a housing chamber 201;

a protective layer 30;

a brazing material 40.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

A method of manufacturing a pot 100 and a pot 100 according to an embodiment of the present invention will be described below with reference to fig. 1 to 7, and the pot 100 according to an embodiment of the present invention is manufactured by the method of manufacturing the pot 100 according to an embodiment of the present invention.

Referring to fig. 1 to 7, a pot 100 according to an embodiment of the first aspect of the present invention may include: the cookware comprises a cookware body 10, a composite bottom 20 and a protective layer 30, wherein the protective layer 30 comprises a nitriding layer. As shown in fig. 1, the manufacturing method may include the steps of:

s1: obtaining a pot body 10 and a composite bottom 20;

s2: mounting the double bottom 20 on the outer surface of the pot body 10 and arranging a brazing material 40 between the double bottom 20 and the pot body 10;

s3: performing nitriding treatment to form a nitriding layer on at least one of the inner surface and the outer surface of the pot body 10 provided with the double bottom 20;

s4: performing brazing treatment on the pot 100 to melt the brazing material 40;

s5: the pot 100 is cooled to cool the melted brazing material 40 to connect the double bottom 20 and the pot body 10.

The cookware 100 manufactured by the manufacturing method according to the embodiment of the invention has the composite bottom 20, the composite bottom 20 is compounded on the outer surface of the cookware body 10, the thickness of the cookware 100 can be thickened, the heat storage performance of the cookware 100 can be improved, meanwhile, the heat conduction performance of the cookware 100 can be improved by utilizing the composite bottom 20, the thickness of the heated area of the cookware 100 is increased, the heat conduction performance is improved, the temperature uniformity is improved, local high temperature cannot be generated, the generation of oil smoke is reduced, and the physical health of users is facilitated.

Alternatively, the double bottom 20 may be combined on a part of the outer surface of the pot body 10, such as the bottom wall of the pot body 10, or the lower parts of the bottom wall and the side wall of the pot body 10; the composite bottom 20 can also be compounded on the whole outer surface of the pot body 10, which is within the protection scope of the present invention.

In addition, by forming the nitriding layer on at least one of the inner surface and the outer surface of the pot body 10 provided with the double bottom 20, at least one of the inner surface and the outer surface of the pot body 10 provided with the double bottom 20 can be protected from rusting or scratching, iron rust (Fe2O3) harmful to human health is not easily generated in the use process of the pot 100, and the appearance of the pot 100 is more attractive.

Here, the "inner surface" means a side surface of the pot body 10 provided with the double bottom 20 facing the pot cavity of the pot 100, for example, an upper surface of the pot body 10 shown in fig. 2 to 5, so that the upper surface of the pot body 10 can be isolated from air and water, and is not easily corroded and rusted. The "outer surface" refers to a side surface of the pot body 10 provided with the double bottom 20 facing the pot cavity, for example, the lower surface of the pot body 10 shown in fig. 2-5, so that the lower surfaces of the pot body 10 and the double bottom 20 can be isolated from air and water, and are not prone to corrosion and rusting.

In the embodiment of the cookware body 10 with the double bottom 20, as shown in fig. 5 and 6, the double bottom 20 is mounted on the outer surface of the cookware body 10, so that the nitriding layer can be formed on the outer surface of the double bottom 20, i.e. on the side surface of the double bottom 20 facing away from the cookware body 10. The nitriding layer can not only protect the surface of the cookware body 10 from rusting or scratching, but also protect the surface of the double bottom 20 from rusting or scratching. Optionally, the outer surface of the pot body 10 may be provided with a protective layer 30, and the protective layer 30 may also cover the outer surface of the double bottom 20 to protect the double bottom 20 and prevent the double bottom 20 from scratching or rusting.

In addition, in the embodiment that the internal surface and the surface of the pan body 10 that are provided with double bottom 20 all are formed with the nitriding layer, as shown in fig. 5 and fig. 6, the nitriding layer of locating the internal surface can independently set up with the nitriding layer of locating the surface, also can connect each other in order to form a whole nitriding layer, and the nitriding layer is more comprehensive to the protection of pan body 10, and rust-resistant effect is better to the nitriding process is simpler.

In the present invention, the protection layer 30 may include a nitriding layer, and of course, in some embodiments, the protection layer 30 may also include other materials or material layers formed by a treatment process to further improve the protection effect.

In the invention, the cookware body 10 and the composite bottom 20 are connected by brazing through the brazing material 40, so that the brazing production cost is low, and the production cost of the cookware 100 is favorably reduced.

In addition, because the temperature is high in the nitriding treatment process, if the brazing treatment is performed first and then the nitriding treatment is performed, the brazing material 40 connecting the double bottom 20 and the pot body 10 may be softened or even melted in the nitriding treatment process, so that the double bottom 20 and the pot body 10 are deformed, dislocated or even fall off. And because nitride can be produced on the surface of the cookware body 10 in the nitriding treatment process, and the bonding force between the nitride and the double bottom 20 is poor, if the brazing material 40 is arranged between the cookware body 10 and the double bottom 20 after the nitriding treatment, then the brazing treatment is carried out, that is, if the double bottom 20 is brazed with the cookware body 10 after a nitriding layer is formed on the outer surface of the cookware body 10 after the nitriding treatment, the bonding force between the double bottom 20 and the cookware body 10 with the nitriding layer is poor, the double bottom 20 is easy to fall off, and the use can not be satisfied.

The manufacturing method of the invention adopts the process sequence that the brazing material 40 is arranged between the cookware body 10 and the composite bottom 20 before the nitriding treatment, and then the brazing treatment is carried out after the nitriding treatment. After the brazing treatment, the brazing material 40 can firmly connect the cookware body 10 and the composite bottom 20, and can not be melted and deformed by high temperature, so that the connection firmness of the composite bottom 20 and the cookware body 10 can be effectively improved. In addition, in the nitriding treatment process, the cookware body 10, the composite bottom 20 and the brazing material 40 are arranged, so that the surface of the cookware body 10 used for being connected with the composite bottom 20 cannot form nitride, and the connection firmness of the composite bottom 20 and the cookware body 10 can be effectively improved.

Further, nitriding treatment is carried out at a temperature of T1, brazing treatment is carried out at a temperature of T2, the melting temperature of the brazing material 40 is T3, and T1 < T3 ≦ T2 is satisfied. The temperature T1 during nitriding treatment is less than the melting temperature T3 of the brazing material 40, so that the brazing material 40 is not easy to melt and deteriorate during nitriding treatment to influence the strength of subsequent brazing connection. The temperature T2 during the brazing treatment is not less than the melting temperature T3, so that the brazing material 40 can be fully melted in the brazing process and bonded with the surfaces of the pot body 10 and the composite bottom 20, and after the cooling treatment, the brazing material 40 can form a composite bottom layer tightly connected with the pot body 10 and the composite bottom 20, and the connection is firm.

According to the manufacturing method of the pot 100 provided by the embodiment of the invention, the pot body 10 and the double bottom 20 can be firmly bonded through the brazing material 40 by arranging the brazing material 40, nitriding treatment is carried out, and then the brazing treatment is carried out, so that the double bottom 20 is not easy to separate from the pot body 10, and the manufactured pot 100 is provided with the double bottom 20 and the protective layer 30, is uniform in heat conduction, not easy to deform, more reliable in structure, beneficial to reducing the generation of oil smoke, safer in use, good in antirust performance and longer in service life.

According to some embodiments of the present invention, the temperature T1 at the time of nitriding treatment satisfies: t1 is more than or equal to 500 ℃ and less than or equal to 580 ℃, and low-temperature nitriding is realized. Within the temperature range, the nitriding treatment period is short, the cost is low, the nitriding layer is thick, the rust resistance is good, and the brazing material 40 is not easy to melt or deteriorate in the nitriding treatment process. Alternatively, in some embodiments, the temperature T1 may be 510 ℃, 520 ℃, 530 ℃, 540 ℃, 550 ℃, 560 ℃, 570 ℃, and the like, respectively.

According to some embodiments of the invention, the temperature T2 at the time of the brazing process satisfies: t2 is more than or equal to 620 ℃ and less than or equal to 700 ℃, and high-temperature brazing is realized. If the temperature is too high, the brazing material 40 is easy to deteriorate, and the welding performance is affected; if the temperature is too low, the brazing material 40 is not sufficiently melted, which also affects the welding performance, and in this temperature range, the brazing material 40 can be sufficiently melted, which is advantageous for improving the connection reliability. Alternatively, in some embodiments, the temperature T2 may be 630 ℃, 640 ℃, 650 ℃, 660 ℃, 670 ℃, 680 ℃, 690 ℃, and the like, respectively.

According to some embodiments of the present invention, the melting temperature T3 of brazing material 40 satisfies: t3 is more than or equal to 620 ℃ and less than or equal to 700 ℃. The higher temperature of T3 makes the brazing material 40 not easy to melt and deteriorate due to the nitriding temperature exceeding the melting temperature during nitriding treatment, thereby affecting the strength of subsequent brazing connection. Alternatively, in some embodiments, the temperature T3 may be 630 ℃, 640 ℃, 650 ℃, 660 ℃, 670 ℃, 680 ℃, 690 ℃, and the like, respectively.

In some embodiments of the present invention, as shown in fig. 2, the upper surface of the double bottom 20 is recessed downward to form a receiving groove, and the step of installing the double bottom 20 on the outer surface of the pot body 10 and providing the brazing material 40 may further include:

arranging the brazing material 40 in the accommodating groove of the double bottom 20;

the double bottom 20 is connected with the pot body 10 so that the brazing material 40 is disposed between the pot body 10 and the double bottom 20.

The provision of brazing material 40 through the above steps is easier, simpler to operate, and less demanding on the morphology of brazing material 40.

In other embodiments of the present invention, as shown in fig. 2, 3 and 7, the step of installing the composite bottom 20 and providing the brazing material 40 on the outer surface of the pot body 10 may further include:

connecting the double bottom 20 with the pot body 10, and forming an accommodating cavity 201 between the double bottom 20 and the pot body 10;

the brazing material 40 is disposed in the accommodation chamber 201.

Through the steps, the brazing material 40 is arranged, the double bottom 20 and the pot body 10 are connected easily, and the containing cavity 201 is filled with the brazing material 40 completely, so that the reliability of the brazing material 40 in connecting the double bottom 20 and the pot body 10 is improved.

In addition, the accommodation chamber 201 may be provided hermetically to prevent the brazing material 40 from leaking and to prevent the brazing material 40 from being oxidized at a high temperature. The composite bottom 20 can be provided with through holes, and the brazing material 40 can be communicated with the outside through the through holes, so that the brazing material 40 can enter the accommodating cavity 201 through the through holes, and the brazing material 40 is easier to arrange. Alternatively, the through holes can be arranged at the bottom of the double bottom 20, which has less influence on the appearance of the cooker 100. Alternatively, the brazing material 40 may be filled into the accommodating cavity 201 through a filling device, so that the production efficiency may be improved, and the filling effect may be better.

In some embodiments, the through hole may be provided on the double bottom 20 before the double bottom 20 is installed on the pot body 10, for example, formed together when the double bottom 20 is manufactured. In other embodiments, before the brazing material 40 is disposed in the accommodating cavity 201, a through hole may be formed in the double bottom 20 mounted on the pot body 10, that is, the through hole may be processed after the double bottom 20 is mounted on the pot body 10.

Further, after the brazing material 40 is disposed in the accommodating chamber 201, the through hole may be sealed, for example, by welding a closing member to close the through hole, so as to prevent the brazing material 40 from leaking from the through hole.

Alternatively, in the present invention, brazing material 40 may be in a powder form or a paste form, where powdered brazing material 40 has small particles, and paste brazing material 40 has certain fluidity, so that brazing material 40 is more conveniently disposed. The pasty brazing material 40 is not easy to scatter, so that the filling operation is facilitated, and meanwhile, gaps are not easy to appear in the pasty brazing material 40, so that a more compact composite bottom layer is formed in the brazing treatment.

In the embodiment where the brazing material 40 is filled into the accommodating chamber 201 through the through hole, the size of the through hole can be made smaller to reduce the influence on the structure and appearance of the composite bottom 20, the brazing material 40 in powder or paste form can more easily pass through the through hole, so that the filling is easier, and the brazing material 40 can be facilitated to completely fill the accommodating chamber 201, so that the connection is more reliable. The brazing material 40 can be filled into the containing cavity 201 in any shape, and can be suitable for cookware 100 in any shape, so that the manufacturing flexibility is greatly improved.

In some embodiments of the present invention, when the double bottom 20 is installed on the outer surface of the pot body 10, the double bottom 20 and the pot body 10 are welded and connected, so that the connection is firm, which is beneficial to sealing. And adopt positioner location double-bottom 20 and pan body 10's relative position to prevent that double-bottom 20 from taking place the off normal when welding in pan body 10, make the interval distribution everywhere between double-bottom 20 and the pan body 10 even, be favorable to going on smoothly of braze welding processing. Alternatively, the welding mode can be laser welding, arc welding and the like, and the welding seam is tight and is firmly connected. In some embodiments, the edge of the double bottom 20 is welded to the outer surface of the pot body 10.

According to some embodiments of the invention, nitriding treatment and brazing treatment can be performed in the same treatment device, the treatment device does not need to be replaced in the manufacturing process, the manufacturing process is simplified, the temperature in the treatment device can be directly increased to the temperature required by brazing treatment after nitriding treatment, and the brazing treatment is performed by using the waste heat after nitriding treatment, so that the energy is saved, the cost is reduced, the environment is protected, and the production efficiency is higher.

Alternatively, the treatment device may be a nitriding furnace. Alternatively, the nitriding treatment may be ion nitriding or gas nitriding. Wherein, when the nitriding temperature is fixed, the thickness of a nitriding layer formed by ion nitriding is larger, and the antirust effect is better. In the embodiment using ion nitriding, the processing apparatus may be a vacuum furnace, which can prevent the brazing material 40 from being oxidized at high temperature in a vacuum environment, and is advantageous to the stability of the brazing process.

According to some embodiments of the invention, the temperature raising treatment is carried out after the nitriding treatment is completed, so that when the cookware 100 reaches the temperature T2, the temperature raising time is T, and T is less than or equal to 30 min. If the temperature rise time is too long and exceeds the active action time of the brazing material 40, the brazing material 40 is easy to be liquated, so that the surface of the brazing material 40 is oxidized, the connection strength after brazing treatment is greatly influenced, the thermal resistance between the cookware body 10 and the composite bottom 20 is increased, and the heat conduction performance of the cookware 100 is influenced. Therefore, a shorter temperature rise time is advantageous to reduce oxidation of the brazing material 40, improving the joining strength and the heat conduction performance of the pot 100. For example, the temperature rise time t may be 5min, 10min, 15min, 20min, 25min, or the like.

According to some embodiments of the present invention, the maximum fill thickness of braze material 40 may be L, as shown in FIG. 3. If L is too small, the brazing material 40 is difficult to fill after the composite bottom 20 is attached to the pot body 10, the brazing material 40 is likely to be insufficiently filled, which affects the progress of the brazing process, and the composite bottom layer formed by the brazing material 40 has too small a thickness, which may not improve the thermal conductivity. If L is too big, then can lead to compound bottom layer thickness too big, not only can make pan 100 heat the difficulty, bring the waste of the energy, can make pan 100's weight overweight moreover, influence user's normal use.

Therefore, in the present invention, the maximum filling thickness L of the brazing material 40 satisfies: l is more than or equal to 2mm and less than or equal to 10mm, which is beneficial to improving the heat-conducting property, reducing the energy consumption and reducing the weight of the cookware 100, and the brazing material 40 is easier to fill. For example, in some embodiments, L may be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and the like, respectively.

Here, the "maximum filling thickness L of the brazing material 40" means the maximum width of the gap between the double bottom 20 and the pot body 10. For example, in the embodiment shown in fig. 3, the middle of the upper surface of the double bottom 20 is a plane, the edge is an arc surface connected with the plane and extending upward in an inclined manner, the outer bottom surface of the pot body 10 is a plane parallel to the middle of the double bottom 20, the outer side surface of the pot body 10 is an arc surface extending upward in an inclined manner, and the edge of the double bottom 20 is connected with the outer side surface of the pot body 10. In this embodiment, the gap between the plane of the upper surface of the double bottom 20 and the plane of the outer bottom surface of the pot body 10 is the maximum filling thickness.

In some embodiments of the present invention, as shown in fig. 4, the double bottom 20 has a dimension H extending in the axial direction of the pot body 10, and the pot 100 has an axial dimension H when the protective layer 30 is not provided. It is regular that H, H is big more, and compound end 20 is big more along the radial and axial coverage of pan body 10, if H is too big, compound end 20 can exceed pan 100's heating range at the coverage of pan body 10's surface to H too big still can lead to holding the volume of chamber 201 too big, required brazing material 40 is too much, not only extravagant brazing material 40, and the difficulty that can make production increases moreover, and manufacturing cost rises, also does not benefit to the weight that alleviates pan 100. Therefore, in the invention, H is less than or equal to H/2, so that the waste of raw materials is reduced, and the production cost and the weight of the cooker 100 are reduced. For example, in some embodiments, H may be H/5, H/4, H/3, or the like.

Optionally, in the present invention, the pot body 10 may be made of at least one of a steel material and a ferrous material, and does not contain toxic substances, and when cooking food materials, the pot body 10 may separate out iron elements, which is beneficial to human health. Wherein, better nitriding layer can be obtained after the nitriding treatment of the iron material, and the antirust effect is better. Alternatively, the pot body 10 may be made of a single layer of ferrous material or steel material, or a multi-layer composite board material of ferrous material or steel material.

In addition, the composite bottom 20 may be made of a magnetic conductive material, which may induce a magnetic field of the cooking range, so that the pot 100 may be applied to an IH electromagnetic heating type cooking range, not only to an open fire cooking range, and thus, the application range of the pot 100 is expanded. Alternatively, the composite bottom 20 may be made of iron, steel or ferromagnetic stainless steel material with better magnetic permeability.

Optionally, the brazing material 40 may include at least one of silver, copper, zinc, cadmium, tin, silicon, nickel, and manganese, the brazing material 40 is not prone to generate gas during the brazing process, so that the double bottom 20 and the pot body 10 are prevented from expanding and deforming due to a large amount of gas generated after the brazing process, and the double bottom 20 and the pot body 10 are connected more firmly. And brazing material 40 has good deoxidation ability, wettability, and stability.

In the present invention, as shown in fig. 2 to 5, at least a portion of the lower surface of the double bottom 20 may be a flat surface, and the flat surface may contact with the placing surface. From this, pan 100 both can be used for the gas-cooker, can be used for the electromagnetism stove again to satisfy different users' user demand, and pan 100 can also directly place in the face of placing such as desktop, need not the support frame, also difficult emergence is emptyd, and it is more convenient to use.

In a specific embodiment, the double bottom 20 and the pot body 10 can be made of iron materials, and the double bottom 20 and the pot body 10 are made of the same material, so that galvanic corrosion at the contact position due to different electric potentials is avoided, and the service life of the pot 100 is prolonged. When the double bottom 20 is installed on the pot body 10 by welding, the same material is also beneficial to the welding firmness.

The pot 100 according to the second aspect of the present invention is manufactured using the method of manufacturing the pot 100 according to the embodiment of the present invention. Because the manufacturing method of the pot 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, the double bottom 20 of the pot 100 according to the embodiment of the present invention is not easily separated from the pot body 10, and the pot 100 has the double bottom 20 and the protective layer 30, which are uniform in heat conduction, not easy to deform, more reliable in structure, beneficial to reducing the generation of oil smoke, safer in use, and has good rust-proof performance and longer service life.

The cooker 100 according to the third aspect of the present invention includes: the cookware body 10, compound end 20, inoxidizing coating 30 and brazing material layer, compound end 20 is connected with the cookware body 10 to being formed with between compound end 20 and the cookware body 10 and holding the chamber 201, inoxidizing coating 30 includes the nitriding layer, and the nitriding layer can set up in at least one of the internal surface of cookware body 10 and surface, in order to prevent that the cookware body 10 from rustting. A brazing material layer may be disposed in the receiving cavity 201 to connect the double bottom 20 and the pot body 10. It should be noted that the brazing material layer is formed by the brazing material 40 disposed in the accommodating chamber 201 as described above.

Further, in the embodiment that the protective layer 30 is disposed on the outer surface of the pot body 10, the protective layer 30 may also cover the outer surface of the double bottom 20 to protect the double bottom 20 and prevent the double bottom 20 from scratching or rusting.

The method of manufacturing the pot 100 according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings, it being understood that the following description is illustrative only and not to be construed as limiting the invention.

As shown in fig. 2 to 7, the method of manufacturing the pot 100 according to the first embodiment of the present invention includes the steps of:

s71: the cookware body 10 and the composite bottom 20 are manufactured by iron materials through processes of die drawing, spinning or hydraulic drawing and the like;

s72: fixing the pot body 10 and the double bottom 20 by a positioning clamp;

s73: the edge of the double bottom 20 and the outer surface of the pot body 10 are welded and sealed, so that the welding seam is tight and has no leakage, and a completely closed accommodating cavity 201 is formed between the double bottom 20 and the pot body 10;

s74: a through hole is arranged at the bottom of the compound bottom 20;

s75: filling the brazing material 40 into the accommodating cavity 201 through the through hole until the accommodating cavity 201 is completely filled;

s76: welding a closed part to close the through hole;

s77: placing the pot blank obtained in the step S76 in a nitriding furnace, and carrying out nitriding treatment at the low temperature of 500-580 ℃ so as to form a nitriding layer on the inner surface and the outer surface of the pot blank;

s78: raising the temperature in the nitriding furnace to 620-700 ℃ within 30min to fully melt the brazing material 40 so as to carry out high-temperature brazing treatment;

s79: the pot 100 is manufactured by cooling the melted brazing material 40 to connect the double bottom 20 and the pot body 10.

Other constructions and operations of the cooker 100 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A manufacturing method of a pot is characterized in that the pot comprises a pot body, a composite bottom and a protective layer, and the manufacturing method comprises the following steps:

obtaining the cookware body and the composite bottom;

mounting the composite bottom on the outer surface of the cookware body and arranging brazing materials between the composite bottom and the cookware body;

after the brazing material is arranged, nitriding treatment is carried out to form a nitriding layer on at least one of the inner surface and the outer surface of the cookware body provided with the composite bottom, and the protective layer comprises the nitriding layer;

after the nitriding treatment is carried out, carrying out brazing treatment on the pot to melt the brazing material;

cooling the pot to cool the melted brazing material to connect the composite bottom and the pot body,

the nitriding treatment is carried out at the temperature T1, the brazing treatment is carried out at the temperature T2, the melting temperature of the brazing material is T3, and T1 is more than T3 and is not more than T2.

2. The method for manufacturing a pot according to claim 1, wherein T1 is 500 ℃ or more and 580 ℃ or less.

3. The method for manufacturing a pot according to claim 1, wherein T2 is 620 ℃ or less and 700 ℃ or less.

4. The method for manufacturing a pot according to claim 1, wherein T3 is 620 ℃ or less and 700 ℃ or less.

5. The method of manufacturing a pot according to claim 1, wherein the step of installing the composite bottom on the outer surface of the pot body and providing the brazing material further comprises:

connecting the double bottom with the cookware body and forming an accommodating cavity between the double bottom and the cookware body;

disposing the brazing material within the containment cavity.

6. The method for manufacturing a pot according to claim 5, wherein the receiving cavity is closed, and a through hole communicating with the receiving cavity is formed in the double bottom before the double bottom is mounted on the pot body, or after the double bottom is mounted on the pot body and before the brazing material is disposed in the receiving cavity, and the brazing material enters the receiving cavity through the through hole.

7. The method of manufacturing a pot according to claim 6, wherein the through hole is sealed after the brazing material is disposed in the receiving cavity.

8. The method for manufacturing a pot according to claim 1, wherein the nitriding process and the brazing process are performed in the same processing apparatus.

9. The method for manufacturing a pot according to claim 1, wherein a temperature raising process is performed after the nitriding process is completed to make the pot reach the temperature T2, wherein the temperature raising time is T, T is less than or equal to 30 min.

10. The method of manufacturing a pot according to claim 1, wherein the brazing material is in a powder or paste form.

11. The method for manufacturing a pot according to claim 1, wherein the maximum filling thickness of the brazing material is L, and L is 2mm or more and 10mm or less.

12. The method for manufacturing the cookware according to claim 1, wherein the dimension of the double bottom extending in the axial direction of the cookware body is H, the axial dimension of the cookware without the protective layer is H, and H is less than or equal to H/2.

13. The method of manufacturing a pot according to claim 1, wherein when the double bottom is mounted on the outer surface of the pot body, the double bottom and the pot body are welded and a positioning device is used to position the relative position of the double bottom and the pot body.

14. The method for manufacturing a pot according to any one of claims 1 to 13, wherein the pot body is made of at least one of a steel material and a ferrous material, the composite bottom is made of a magnetic conductive material, and at least a part of the lower surface of the composite bottom is a plane in contact with the placement surface.

15. The method of manufacturing a cookware according to any of claims 1-13, wherein the brazing material comprises at least one of silver, copper, zinc, cadmium, tin, silicon, nickel, manganese.

16. The method of manufacturing a pot according to any of claims 1 to 13, wherein the composite bottom and the pot body are made of ferrous material.

17. A cookware, characterized by being made with the method of manufacturing cookware according to any of claims 1-16.

18. A cookware, comprising:

a pot body;

the double bottom is connected with the cooker body, and an accommodating cavity is formed between the double bottom and the cooker body;

the protective layer comprises a nitriding layer, and the nitriding layer is arranged on at least one of the inner surface and the outer surface of the cookware body;

a brazing material layer arranged in the containing cavity to connect the composite bottom and the cookware body, wherein,

the brazing material layer is formed by performing brazing treatment on the brazing material in the containing cavity after the nitriding layer is formed, the nitriding layer is formed by performing nitriding treatment at the temperature T1, the brazing treatment is performed at the temperature T2, the melting temperature of the brazing material is T3, and T1 is more than T3 and is not more than T2.

19. The cookware of claim 18, wherein the protective layer is provided on the outer surface of the cookware body and covers the outer surface of the double bottom.

20. The pot as claimed in claim 18, wherein the brazing material layer has a maximum filling thickness of L, 2mm L10 mm.

21. The cookware of claim 18, wherein the double bottom extends in the axial direction of the cookware body by a dimension H, the cookware has an axial dimension H when the protective layer is not arranged, and H is less than or equal to H/2.

22. The cookware according to claim 18, wherein the cookware body is made of at least one of steel material and iron material, the composite bottom is made of magnetic conductive material, and at least a part of the lower surface of the composite bottom is a plane in contact with the placement surface.

23. The cookware according to claim 18, wherein said brazing material comprises at least one of silver, copper, zinc, cadmium, tin, silicon, nickel, manganese.