CN117359238A

CN117359238A - Inner container manufacturing method and rice cooking utensil

Info

Publication number: CN117359238A
Application number: CN202311674316.4A
Authority: CN
Inventors: 王祎珂; 王翔; 张根森
Original assignee: Joyoung Co Ltd
Current assignee: Joyoung Co Ltd
Priority date: 2023-12-08
Filing date: 2023-12-08
Publication date: 2024-01-09

Abstract

The application provides a liner manufacturing method and a rice cooking appliance, which are used for solving the technical problem of poor parameter consistency in the technical problems; according to the manufacturing method of the liner, the surface of the metal plate is polished to form a smooth surface, embossing is carried out on the smooth surface, a plurality of independent quadrilateral grooves are formed through embossing, the depth of each quadrilateral independent groove is 0.01-0.05 mm, and the width of each quadrilateral independent groove is 0.3-0.6 mm; smooth ribs are formed between adjacent independent grooves, and the width of each smooth rib is 0.1mm-0.3mm; and stretching the metal plate provided with a plurality of independent grooves and smooth ribs to form the liner. The technical scheme of the application not only ensures that the shape and the size of each groove are consistent, but also ensures that the surface roughness of each part in the groove is consistent; the obtained liner has small roughness change, obvious non-tackiness performance improvement and difficult food residue.

Description

Inner container manufacturing method and rice cooking utensil

Technical Field

The application belongs to the technical field of kitchen appliances, and particularly relates to a liner manufacturing method and a rice cooking appliance.

Background

In the existing rice cooking utensil, the non-stick performance of the rice inner container can be improved by forming the grooves and the protrusions on the inner surface of the inner container without using the non-stick coating, so that the non-stick effect of the coating 0 is realized.

The existing 0-layer inner container is formed with grooves and bulges on the inner surface of stainless steel by chemical etching, and the chemical etching has high efficiency, but has large pollution and is easy to cause the later reject ratio; in addition, the grooves or the protrusions can be formed through laser engraving, so that the laser engraving processing efficiency is low, and the method is not suitable for batch production; in addition, the grooves or the protrusions can be formed through mechanical pressing, so that the requirement of processing efficiency can be met, but the problem that the consistency of the surface roughness, the surface friction coefficient and the adhesion coefficient of the grooves and the protrusions is poor is caused in the mechanical pressing in the application process, so that the consistency of the non-adhesive performance of the 0-layer liner is poor, and the problem that rice is easy to stick to a pot at certain positions and the non-adhesive performance of rice at certain positions is good is caused.

Disclosure of Invention

The application provides a liner manufacturing method and a rice cooking appliance, which are used for solving the technical problem of poor parameter consistency in the technical problems.

On the one hand, the technical scheme adopted by one embodiment of the application is as follows:

a manufacturing method of an inner container comprises the steps of polishing the surface of a metal plate to form a smooth surface, embossing the smooth surface to form a plurality of independent quadrilateral grooves, wherein the depth of each quadrilateral independent groove is 0.01-0.05 mm, and the width of each quadrilateral independent groove is 0.3-0.6 mm; smooth ribs are formed between adjacent independent grooves, and the width of each smooth rib is 0.1mm-0.3mm; and stretching the metal plate provided with a plurality of independent grooves and smooth ribs to form the liner.

As a preferred implementation of this example, the embossing step comprises: the embossing roller is used for forming the patterns, and the embossing roller is used for pressing the smooth surface side of the metal plate to form the patterns formed by the smooth ribs and the grooves on the smooth surface side.

As a preferred implementation of this embodiment, the processing of the stretched liner further includes: and (3) secondary polishing is carried out on the inner surface of the formed liner, which is provided with a plurality of independent grooves and smooth ribs.

As a preferred implementation of this embodiment, after the step of obtaining the grooves and the smooth ribs, further includes: and (3) coating the surface with the grooves and the smooth ribs to protect the surface of the metal plate with the grooves and the smooth ribs.

As a preferred embodiment of this embodiment, the processing step of the liner before stretching further includes: removing the protective film covered on the metal plate; and stretching the metal plate from which the protective film is removed.

As a preferable implementation mode of the embodiment, the surface roughness of the polished smooth surface formed by polishing the surface of the metal plate is smaller than that of the inner surface of the liner after molding.

As a preferred embodiment of this example, the surface roughness Ra of the groove bottom surface of the groove is 2 to 9 μm; the surface roughness Ra of the upper surface of the smooth rib is 2-9 mu m.

As a preferred embodiment of this example, the surface roughness Ra of the groove bottom surface of the groove is 6 to 9 μm; the surface roughness Ra of the upper surface of the smooth rib is 3-8 mu m.

As a preferred implementation of this embodiment, the smooth rib has a smaller topographical area than the groove.

On the other hand, another embodiment of the application provides a rice cooking utensil, including pot cover, pot body, be equipped with the inner bag through any one of the above-mentioned inner bag preparation method preparation in the pot body, be equipped with the metal cover plate on the pot cover, the metal cover plate is equipped with the sealing washer, the courage edge of inner bag is equipped with the turn-ups, the upper surface of turn-ups is the plane through polishing removal recess, and the sealing washer butt is on this plane.

Due to the adoption of the technical scheme, the beneficial effects obtained by the application are as follows:

compared with the prior art, the manufacturing method of the liner has the advantages that the smooth surface is formed by polishing the surface of the metal plate before embossing the metal plate, and then the smooth surface is embossed, so that a plurality of independent grooves are formed, the uniformity of the shape and the size of each groove is good, and the uniformity of the surface roughness of each position in the groove is also good. In contrast to the chemical etching or laser engraving of grooves, embossing utilizes the ductility of metal to form the grooves, whereby the bottom wall and the side walls of the grooves are part of the mirror or smooth surface of the metal sheet before forming, and after forming, part of the mirror surface of the metal sheet becomes the bottom wall of the groove and part of the mirror surface becomes the side walls of the groove, whereby the surface roughness of the side walls and the bottom wall are close, and the uniformity of the surface roughness of each part in the groove is good because the surface roughness of the side walls and the bottom wall are close for a single groove. The grooves are quadrilateral, smooth ribs between adjacent grooves are used as one side of the quadrilateral, the thickness of the smooth ribs along the side length direction is consistent, the phenomenon of thickening or thinning does not occur, so that under the unit area, the occupied area of each independent groove is indirectly larger than that of each smooth rib, the non-tackiness is better, the depth of each independent groove is controlled to be 0.01-0.05 mm in the embossing process, the width of each smooth rib is 0.1-0.3 mm, the excessive deformation of a metal plate can be avoided, the variation of roughness after pressing is reduced, in addition, when the depth h of each groove is smaller than 0.01, firstly, the volume of each groove is limited, the water or rice slurry storage capacity of each groove is reduced, secondly, the smooth ribs are difficult to form effective support for rice, the rice is easy to contact the bottom surface of each groove, the non-tackiness of each liner is reduced, and thirdly, the strength of each smooth rib is insufficient to cause the abrasion easily caused, so that the non-tackiness of each liner is reduced; when recess degree of depth h is greater than 0.05mm, make the recess more easily to collect dirty and dirty on the one hand, on the other hand makes the difference of oral area width and diapire width too big easily for the top of smooth muscle is too thin, and then leads to the smooth muscle intensity of inner bag not enough easy problem of wearing and tearing. Finally, the inner container is formed by stretching, and the roughness of the inner container obtained by the inner container manufacturing method is changed slightly, so that the non-tackiness performance is improved obviously, and food residues are not easy to exist. When the width of the smooth rib is smaller than 0.1mm, the strength of the smooth rib is too low, the smooth rib is easy to wear, and when the width of the smooth rib is larger than 0.3mm, the occupied area of the smooth rib in unit area is larger, and the non-stick performance is reduced.

In some preferred embodiments, grooves and smooth ribs are obtained by a rolling process, which is efficient in processing and capable of being rolled to finish pattern pressing.

In some preferred embodiments, the inner surface of the formed liner is provided with a plurality of independent grooves and smooth ribs for secondary polishing, in general, the number of polishing processes is larger than that of secondary polishing processes, the polishing processes are more, the final surface roughness value is required to be smaller, and the surface is smoother.

In some preferred embodiments, the surface roughness of the polished smooth surface of the metal plate is smaller than the surface roughness of the inner surface of the liner after molding, so that the surface roughness of the polished smooth surface is smaller than the surface roughness of the inner surface of the liner after molding compared with the surface roughness of the polished smooth surface before molding the grooves and the smooth ribs. The manufacturing method ensures that the roughness of the formed grooves and smooth ribs is not too large after being formed, the roughness of the surface of the formed liner is obtained by taking the surface roughness of the smooth surface as the basis, and the roughness of the surface of the formed liner is relatively good when the formed liner has a good parameter basis.

In some preferred embodiments, the surface of the metal sheet material pressed with grooves or protrusions is coated to protect the morphology of the metal surface.

In some preferred embodiments, the smooth rib has a smaller morphology area than the groove, so that the morphology of most areas on the surface of the metal plate is the groove, and the groove has better size consistency during pressing, so that the non-adhesion consistency of the whole liner is better.

In addition, another embodiment of the application provides a rice cooking appliance, which comprises a pot cover and a pot body, wherein the pot body is internally provided with an inner container manufactured by the inner container manufacturing method according to any one of the above, the pot cover is provided with a metal cover plate, the metal cover plate is provided with a sealing ring, the inner container edge of the inner container is provided with a turned edge, the upper surface of the turned edge is a plane with a groove removed by polishing, and the sealing ring is abutted against the plane; the inner container of the rice cooking utensil is manufactured by the inner container manufacturing method, so that the non-adhesive consistency of the inner surface of the inner container is better than that of the inner container with the existing 0 coating, on the basis, in order to ensure the sealing effect, the edge of the inner container is a plane, and the sealing ring is abutted against the plane, so that air leakage is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 is a cross-sectional view of a cooking appliance provided in an embodiment of the present application;

FIG. 2 is a schematic view of an embossed sheet metal according to one embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a liner structure according to an embodiment of the present disclosure;

FIG. 4 is a flow chart of a method of fabricating an embodiment of the present application;

FIG. 5 is an enlarged partial schematic view of a groove and a connecting rib according to a first embodiment of the present application;

FIG. 6 is a cross-sectional view of a metal layer in accordance with one embodiment of the present application;

FIG. 7 is an enlarged partial schematic view of an intersection in accordance with an embodiment of the present application;

FIG. 8 is a cross-sectional view of a composite board in an embodiment of the present application;

FIG. 9 is a schematic view of another embossed sheet metal material according to an embodiment of the present application;

fig. 10 is a partially enlarged schematic illustration of a communication groove and a protrusion according to a second embodiment of the present application;

FIG. 11 is a cross-sectional view of a metal layer in a second embodiment of the present application;

fig. 12 is an enlarged partial schematic view of a cross-connecting portion in a second embodiment of the present application.

Wherein,

a pan body 10; a heating device 105;

a pot cover 20; a metal cover plate 21; a seal ring 22;

an inner container 30; a liner bottom wall 31; a liner sidewall 32; a cooking chamber 33; a flange 34; independent grooves 301; a connecting rib 302; a first smooth surface 320; a second smooth surface 310; stainless steel layer 311; an aluminum layer 312; groove side 303; groove bottom surface 313; an intersection 304; a first side 3031; a second side 3032; a joint surface 305; a first joint 3051; a second joint 3052; a communication groove 307; a protrusion 306; cross communication 309.

Detailed Description

In order to more clearly illustrate the general concepts of the present application, a detailed description is provided below by way of example in connection with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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.

The application provides a rice cooking appliance, which can be an electric rice cooker or a pressure cooker, and in other embodiments, can be other cooking appliances with rice cooking.

Referring to fig. 1, there is shown an electric rice cooker having a pot body 10, a pot cover 20 and an inner container 30, wherein the inner container 30 is disposed in the pot body 10, the inner side of the inner container 30 contacts rice through a metal layer, the pot cover 20 covers the pot body 10, the pot body 10 is provided with a heating device 105 for heating the inner container 30, a rice water mixture is added into a cooking cavity 33 in the inner container 30 during cooking, and the cooking of rice is completed under the heating of the heating device 105 at the bottom of the inner container 30.

In the specific embodiment of the application, the cooking utensil cooks rice through the inner container without coating or 0 coating, and the existing inner container is mostly provided with the inner container with coating, namely, the inner surface of the inner container is provided with a Teflon coating (the academic name is polytetrafluoroethylene, the English abbreviation is PTFE), the inner container without coating is provided with a coating on the substrate of the inner container relatively to the inner container with coating, so that the inner side wall of the inner container is a metal layer which can be in contact with food, the metal layer can be made of stainless steel, and food can be directly contacted and cooked through the metal layer of the inner container, thereby eliminating the problems of falling coating of the inner container with coating and diet health brought by the coating.

Meanwhile, the consistency of product molding can be improved through a manufacturing process in the mechanical pressing process, and the requirements on machining precision are increased due to smaller sizes of molded grooves and protrusions, so that good machining consistency is obtained, and the defective rate is reduced.

The liner is manufactured by polishing the surface of a metal plate to form a smooth surface, embossing the smooth surface to form a plurality of independent quadrilateral grooves, wherein the depth of each quadrilateral independent groove 301 is 0.01-0.05 mm, and the width of each quadrilateral independent groove is 0.3-0.6 mm; smooth ribs are formed between the adjacent independent grooves 301, and the width of each smooth rib is 0.1mm-0.3mm; the formed metal plate is shown in fig. 2 or 9; the sheet metal provided with a plurality of independent grooves 301 and smooth ribs is stretched to form a liner, and the formed liner is shown in fig. 3.

As shown in fig. 4, the method specifically comprises the following steps:

s10: polishing the surface of a sheet-shaped metal plate to obtain a smooth surface on the metal plate;

s20: processing the metal plate through a mechanical pressing process to form a plurality of independent grooves on the polished smooth surface, wherein smooth ribs are formed between every two adjacent independent grooves 301;

s30: processing the metal plate formed with the independent grooves 301 and the smooth ribs into an inner container through a stretching process; wherein the independent grooves are quadrilateral, the depth of each groove is 0.01-0.05 mm, the width of each groove is 0.3-0.6 mm, and the width of each smooth rib is 0.1-0.3 mm.

It should be noted that the width of the groove is the distance between two opposite sides of the four sides of the groove, instead of the distance between adjacent sides and the diagonal distance of the quadrangle. The width of the smooth rib is the thickness of any side in the quadrangle, and the length of the side is not changed.

The polished metal plate has the purpose that the surface roughness of the metal plate can reach 8K mirror surface, and the surface roughness is Ra0.02-0.03 mu m; because the metal surface is smooth enough before pressing, the flaws on the metal surface are removed, and the shape consistency of the pressed bulges (smooth ribs) and the grooves is better. For the bulges (smooth ribs), not only the width, length and depth of the bulges (smooth ribs) can be ensured, but also the surface roughness of the bulges can be ensured, a plurality of bulges are arranged on the inner surface of the inner container in the cooking process, and the consistency of the shape and the size of each bulge and the surface roughness is good, so that the supporting effect of the bulges on the inner surface of the inner container on rice is good, and the problem of non-sticking consistency of the inner surface of the inner container is avoided. The metal plate of the mirror surface is pressed for the groove, so that the uniformity of the shape and the size of each groove is good, the uniformity of the surface roughness of each part in the groove is also good, compared with the case of chemical etching or laser engraving to form the groove, the mechanical pressing (embossing) utilizes the ductility of metal to form the groove, the bottom wall and the side wall of the groove are part of the mirror surface or the smooth surface of the metal plate before forming, after forming, a part of the mirror surface of the metal plate becomes the bottom wall of the groove, and a part of the mirror surface becomes the side wall of the groove, so that the surface roughness of the side wall and the bottom wall are close, and the uniformity of the surface roughness of each part in the groove is good because the surface roughness of the side wall and the bottom wall is close for a single groove. The grooves are quadrilateral, smooth ribs between adjacent grooves are used as one side of the quadrilateral, the thickness of the smooth ribs along the side length direction is consistent, the phenomenon of thickening or thinning does not occur, so that under the unit area, the occupied area of each independent groove is indirectly larger than that of each smooth rib, the non-tackiness is better, the depth of each independent groove is controlled to be 0.01-0.05 mm in the embossing process, the width of each smooth rib is 0.1-0.3 mm, the excessive deformation of a metal plate can be avoided, the variation of roughness after pressing is reduced, in addition, when the depth h of each groove is smaller than 0.01, firstly, the volume of each groove is limited, the water or rice slurry storage capacity of each groove is reduced, secondly, the smooth ribs are difficult to form effective support for rice, the rice is easy to contact the bottom surface of each groove, the non-tackiness of each liner is reduced, and thirdly, the strength of each smooth rib is insufficient to cause the abrasion easily caused, so that the non-tackiness of each liner is reduced; when recess degree of depth h is greater than 0.05mm, make the recess more easily to collect dirty and dirty on the one hand, on the other hand makes the difference of oral area width and diapire width too big easily for the top of smooth muscle is too thin, and then leads to the smooth muscle intensity of inner bag not enough easy problem of wearing and tearing. Finally, the inner container is formed by stretching, and the roughness of the inner container obtained by the inner container manufacturing method is changed slightly, so that the non-tackiness performance is improved obviously, and food residues are not easy to exist. When the width of the smooth rib is smaller than 0.1mm, the strength of the smooth rib is too low, the smooth rib is easy to wear, and when the width of the smooth rib is larger than 0.3mm, the occupied area of the smooth rib in unit area is larger, and the non-stick performance is reduced.

In the existing forming processes, the surface of a metal plate is not subjected to mirror polishing before being pressed, but the inner surface and the outer surface of the inner container are polished after being pressed and stretched to form the inner container, so that the inner surface and the outer surface of the inner container are easily damaged by forming and polishing after forming, if the polishing force is too large, the protrusions on the inner surface of the inner container are firstly polished, meanwhile, the depth of the grooves is reduced because the materials on the surface of the inner container are polished, the rice nonstick performance of the inner container is damaged to a certain extent, in addition, in the polishing process of the grooves, the size of the grooves is smaller, the polishing tool is difficult to penetrate into the grooves, and flexible polishing tools are difficult to contact with the parts which are not easy to contact with the corners, the side walls and the like of the grooves, so that the polishing degree in the grooves is difficult to be uniform, and the nonstick performance consistency is poor because the polishing cannot be comprehensively performed.

In this application, the inner surface of the formed liner having a plurality of independent grooves 301 and smooth ribs is secondarily polished.

The polishing specifically comprises rough polishing, semi-fine polishing, waxing and polishing;

The secondary polishing specifically comprises sand polishing and scouring pad polishing;

in general, the number of polishing processes is greater than that of secondary polishing, more polishing processes are required, the final surface roughness value is smaller, and the surface is smoother, and since polishing is performed before secondary polishing, the surface roughness of the polished smooth surface is smaller than that of the inner surface of the liner after secondary polishing compared with polishing before forming grooves and smooth ribs and secondary polishing. Therefore, the problems that in the existing forming processes, the protrusions and the grooves are easily damaged in appearance due to the fact that the protrusions and the grooves are formed by stretching and then polished for one time, and the polishing degree is difficult to be uniform due to the fact that the protrusions and the grooves are close to the corners, the side walls and other parts which are not easy to contact with each other are avoided.

Rough polishing: the abrasive belt of No. 600 is used for back and forth grinding the surface of the metal plate, and the aim of the process is to remove the oxide layer of the metal plate and the bruise on the surface of the metal plate, so that the surface is basically free from large scratches and bruise.

Semi-fine polishing: the abrasive belt of No. 800 is used for carrying out reciprocating grinding on the surface of the metal plate, the working procedure mainly comprises the steps of correcting defects in the previous working procedure and carrying out further fine grinding on the marks generated after rough polishing, and the marks left in the previous working procedure are repeatedly ground, so that no scratches exist on the surface of the metal plate, and the surface of the metal plate is basically lightened.

Fine polishing: the abrasive belt of 1000# is mainly used for correcting and grinding fine lines in the previous working procedure, and the grinding method is the same as the previous one. The aim of the process is to make the surface of the metal plate further bright, and the metal plate ground by the process is basically close to the mirror effect.

Waxing: the wool wheel driven by a high-speed motor is matched with the dyer wax to simulate the polishing method before to carry out mirror polishing, and the main purpose of the process is to carry out mirror polishing on the metal plate polished by the previous processes instead of further grinding.

Polishing: the process is the final process of mirror polishing, and the metal plate after all the previous processes is wiped clean and polished by rubbing the surface of the metal plate after mirror polishing with a clean cotton cloth wheel. The aim of the process is that the surface of the metal plate is not distinguished by flaws, and the polished workpiece is polished, and the brightness reaches to 8k after specular reflection.

In some embodiments of the present application, the surface roughness of the polished smooth surface formed by polishing the surface of the metal plate is smaller than the surface roughness of the inner surface of the liner after molding, so that the surface roughness of the polished smooth surface formed by polishing is smaller than the surface roughness of the inner surface of the liner after molding compared with the surface roughness of the polished smooth surface formed by polishing the surface of the groove and the smooth rib after molding. The manufacturing method ensures that the roughness of the formed grooves and smooth ribs is not too large after being formed, the roughness of the surface of the formed liner is obtained by taking the surface roughness of the smooth surface as the basis, and the roughness of the surface of the formed liner is relatively good when the formed liner has a good parameter basis.

In some embodiments of the present application, the mechanical pressing process is a rolling process, the embossing roller is driven to rotate by the rolling machine and applies pressure to the metal plate material, so as to form a pattern on the metal plate material, and specifically, the embossing step further includes:

the embossing roller is used for forming the patterns, and the embossing roller is used for pressing the smooth surface side of the metal plate to form the patterns formed by the smooth ribs and the grooves on the smooth surface side.

The grooves and the protrusions (smooth ribs and connecting ribs 302) are obtained through a rolling process, so that the processing efficiency is high, and the rolling process can be used for pressing the rolled finished patterns.

In the application, the metal plate is made of a steel-aluminum-steel composite plate, a stainless steel plate, an alloy aluminum plate and a stainless steel plate are heated in an electric heating furnace, and the composite plate is obtained by roll forming through a roll press after being discharged from the furnace; the composite board ensures that the inner container has better heat transfer performance, more uniform heating and better food cooking effect.

The embossing roller is provided with patterns, and the smooth surface side of the composite board is pressed by a roller press, so that the patterns formed by the bulges and the grooves are formed on the smooth surface side.

In the process of pressing the grooves and the protrusions, the composite plate is stretched and thinned compared with the process of etching the grooves and the protrusions on the composite plate, and for this reason, the thickness of the composite plate is increased by 10% -22%, for example, 1.5mm to 1.65-1.70mm compared with the thickness of the composite plate used in the etching process; 2.0mm, increasing to 2.3-2.35mm;3.0mm, to 3.55-3.65mm.

The grooves are formed in a rolling mode, the patterns on the embossing roller are formed on the cylindrical surface, in the pressing process, the grooves are formed on the metal plate by pressing the protrusions on the cylindrical surface, the protrusions on the cylindrical surface are formed on the metal plate by pressing the protrusions on the metal plate, the grooves are machined on the embossing roller, the protrusions are relatively unprocessed parts on the cylindrical surface, the cylindrical surface can ensure good roundness before machining, the concentricity can be controlled to be very high everywhere, the dimensional error is smaller, the grooves are machined later, the side walls of the grooves are not necessarily kept in the radial direction, the bottom wall of the grooves are not necessarily kept in the circular arc surface coaxial with the cylindrical surface, the protruding surfaces of the embossing roller have higher dimensional accuracy relative to the grooves, in the pressing process of the metal plate in a plane, the grooves formed by pressing the protrusions of the embossing roller have higher dimensional accuracy, and the protrusions formed by pressing the grooves of the embossing roller have relatively lower consistency; preferably, the shape and size of the groove on the metal plate is larger than that of the connecting rib 302, and the shape and size of the connecting rib 302 is smaller than that of the groove in unit area, so that the shape and size of most areas on the surface of the metal plate are grooves, and the uniformity of the groove is better during pressing, so that the non-sticking uniformity of the whole liner is better.

In some embodiments, the protrusions may also have a smaller topographical dimension than the grooves, i.e., the protrusions occupy an area greater than the grooves.

After pressing, the surface with the grooves and the smooth ribs is covered with a film to protect the surface of the metal plate with the grooves and the smooth ribs.

And coating the surface of the metal plate pressed with the grooves or the protrusions to protect the appearance of the metal surface. In some embodiments of the present application, the protective film may be retained during stretching to reduce damage to the surface topography by the stretching die.

After the stretching is finished, the liner wall of the liner can be manually lightly ground so as to avoid serious damage to the bulge.

And then physical vapor deposition is carried out on the liner to optimize the wear resistance of the groove on the inner surface of the liner, thereby prolonging the service life of the liner.

The surface roughness of the groove bottom surface 313 of the groove is 2-9 μm, and the surface roughness Ra of the upper surface of the smooth rib is 2-9 μm. Although the stainless steel reaches the level of the mirror surface 8k before embossing, the surface roughness of the stainless steel liner is increased by the subsequent process, and nevertheless, due to the forming method of polishing, embossing and stretching, the accumulated error of the whole process is smaller, and the consistency of the sizes and parameters of the grooves and the bulges is higher, so that good non-sticking consistency is ensured.

In some embodiments, the surface roughness Ra of the groove bottom surface of the groove is 6-9 μm; the surface roughness Ra of the upper surface of the smooth rib is 3-8 mu m; the stretched liner also undergoes some process steps, the surface roughness Ra of the bottom surface of the processed groove is 6-9 mu m, and the surface roughness Ra of the upper surface is 3-8 mu m.

The surface roughness of the bottom surface of the groove and the smooth rib is measured after the optical magnification of the groove and the smooth rib on the surface of the liner is about 800-1500 times. For example, the surface roughness of the groove bottom surface is 7.5 μm at 1000 times and 8.7 μm at 1200 times.

The application also provides a rice cooking appliance based on the manufacturing method, as shown in fig. 1, the rice cooking appliance comprises a pot cover 20 and a pot body 10, wherein the pot body 10 is internally provided with an inner container 30 manufactured by the manufacturing method of any inner container, the pot cover 20 is provided with a metal cover plate 21, the metal cover plate 21 is provided with a sealing ring 22, the inner container edge of the inner container 30 is provided with a turned edge 34, the upper surface of the turned edge 34 is a plane with a groove removed by polishing, and the sealing ring 22 is abutted against the plane; by the method, the depth of the appearance size of the independent groove 301 can be ensured to be 0.01-0.05 mm, and the smooth ribs and the independent groove 301 can be ensured to have good surface roughness, so that the manufactured liner has good non-sticking consistency of rice. On this basis, in order to guarantee sealed effect, be the plane on the turn over of inner bag edge, the sealing washer supports and leans on this plane, so, avoids gas leakage.

In addition, the specific embodiment of the application provides a liner for rice cooking, as shown in fig. 3, the liner includes a liner side wall 32 and a liner bottom wall 31, and may include two examples, wherein the liner may be formed by stretching a polished and embossed metal plate, and the polishing and embossing are the existing manufacturing processes; the specific embodiments are as follows.

Embodiment one:

the inner container comprises a metal layer forming the inner wall of the inner container, and as shown in fig. 5, a plurality of independent grooves are formed in the metal layer; the depth h of the independent grooves 301 is 0.01 to 0.05mm, surface connecting ribs 302 are arranged between adjacent grooves, the top surfaces of the connecting ribs 302 are first smooth surfaces 320, and the bottom surfaces of the independent grooves 301 are second smooth surfaces 310.

Embodiment two:

the inner container comprises a metal layer forming the inner wall of the inner container, as shown in fig. 9-10, and a plurality of independent protrusions 306 are arranged on the metal layer; the height h of the protrusions 306 is 0.01 to 0.05mm, communication grooves 307 are arranged between adjacent protrusions 306, the top surfaces of the protrusions 306 are first smooth surfaces 320, and the bottom surfaces of the communication grooves 307 are second smooth surfaces 310.

In the two embodiments, the grooves, the protrusions or the connecting ribs 302 are formed on the surface of the liner, and the difference is that the grooves in the first embodiment are independent, the connecting ribs are isolated from each other, the adjacent grooves are not communicated, the connecting ribs are isolated from each other, and the adjacent grooves are not communicated, so that the non-adhesive performance of the 0-layer liner can be improved, in particular, the grooves are isolated from each other by the connecting ribs, so that the grooves are isolated from each other and relatively independent, and the independent grooves and the connecting ribs with the isolation function enable the inner surface of the liner to have a certain water storage capacity, so that the maintenance time of a water film between rice and the inner surface of the liner is prolonged, and the non-adhesive performance of the rice is improved; while the grooves of the second embodiment are in communication and the protrusions are independent of each other.

In the above-mentioned scheme, whether the grooves are independently provided or the protrusions are independently provided, for the grooves, and the protrusions or the connecting ribs, the top surface of the protrusions or the connecting ribs is the first smooth surface 320, and the bottom surface of the grooves is the second smooth surface 310.

As shown in fig. 2, the liner of the first embodiment is formed by stretching the embossed metal plate in the drawing. The first and second smooth surfaces 320, 310 have a surface roughness of between Ra2-9 microns. The first and second smooth surfaces 320 and 310 are provided to reduce adhesion after rice paste or starch grains having viscosity are dried during cooking, thereby being more easily washed away to reduce food residues.

In the first embodiment of the present application, as shown in fig. 6, the groove has a groove bottom surface 313 (second smooth surface 310), the groove has a groove side surface 303 formed by one side of the connecting rib 302, and the groove side surface 303 is inclined to the outside in the width direction of the groove while extending in the depth direction of the groove. Thus, in the cleaning process, the cleaning tool is convenient for cleaning the food remained in the independent grooves, so that the food residue is reduced.

It should be noted that, after the metal sheet is stretched into the liner, the bottom surface 313 of the groove on the rotary sidewall of the liner is a curved surface with radian in macroscopic scale, but since the size of the independent groove 301 is tiny relative to the size of the rotary sidewall of the liner, the bottom surface 313 of the groove can be regarded as a plane approximately; the bottom wall 31 of the liner is macroscopically flat, and the bottom surface 313 of the groove corresponding to the groove on the bottom wall 31 of the liner is also more planar in microscopic view.

The groove has a mouth width D1 and a bottom width D2, the ratio of the mouth width to the bottom wall width beingThe method comprises the steps of carrying out a first treatment on the surface of the Where θ is the angle between the groove side 303 and groove bottom 313 and h is the depth of the groove.

As shown in fig. 6, an inclined included angle θ is formed between the groove side surface 303 and the groove bottom surface 313, so that the groove is horn-shaped in the depth direction, and the included angle θ is controlled to be between 90 and 150 ° and h is controlled to be between 0.01 and 0.05mm in order to avoid excessive difference between the width of the mouth and the width of the bottom of the groove.

As shown in fig. 6, the groove side surface 303 and the groove bottom surface 313 are in transition with an included angle, and the groove side surface 303 and the groove bottom surface 313 are respectively connected at the included angle.

It should be appreciated that whether the groove side and groove bottom 313 transition at an angle or not may be considered to be approximately planar, for example, in this application the groove depth and width dimensions are relatively small and the groove side and groove bottom 313 are both straight, the groove side extending generally toward the groove depth and the groove bottom 313 extending generally toward the groove width, and the depth and width directions being orthogonal, for this reason may be considered to be an angle transition. When the groove sides and groove bottom 313 are significantly curved and the transition engagement is smooth, the angle cannot be significantly resolved, and the transition is not included.

When the included angle theta is smaller than 90 degrees, the grooves cannot be manufactured and processed, when the included angle theta is larger than 150 degrees, the water storage capacity or the rice milk storage capacity of the grooves is reduced, and rice at the side wall 32 of the liner is easy to stick and poor in non-stick performance. When the depth h of the groove is smaller than 0.01, firstly, the volume of the groove is limited, so that the capacity of storing water or rice milk in the groove is reduced, secondly, the protrusions or connecting ribs are difficult to form effective support for rice, the rice is easy to contact the bottom surface 313 of the groove, the non-sticking performance of the liner is reduced, thirdly, when the liner is cleaned, the protrusions or connecting ribs are not strong enough, so that the liner is easy to wear, and the non-sticking performance of the liner is reduced; when recess degree of depth h is greater than 0.05mm, make the recess more easily to collect dirty and dirty on the one hand, on the other hand makes the oral area width and diapire width's difference too big easily for protruding or tie bar's top is too thin, and then leads to the protruding of inner bag or tie bar intensity not enough the problem of wearing and tearing easily.

In some embodiments, the included angle values may also be other values of 130, 132, 145 °, etc., and the groove depth h may also be other values of 0.018, 0.025, 0.027, 0.028, 0.03mm, etc. Correspondingly, the ratio of the width of the mouth to the width of the bottom wall is between 1 and 1.08, preferably greater than 1.

In a first embodiment, as shown in fig. 7, the connecting rib 302 includes a crossing portion 304, the groove side surface further has a first side surface 3031 and a second side surface 3032 located in the same groove, the first side surface 3031 and the second side surface 3032 are crossed and connected at the crossing portion 304, and the depth of the first side surface 3031 or the second side surface 3032 at the crossing portion is compared with the central depth of the groove in proportion to that of the groove: and 0.9 or more and less than 1.

As described above, the grooves are formed by rolling, the patterns on the embossing roller are formed on the cylindrical surface, in the pressing process, the protrusions on the cylindrical surface will press the grooves on the metal plate, and the grooves on the cylindrical surface will press the protrusions on the metal plate, for the embossing roller, the grooves are processed, and relatively, the raised surfaces of the embossing roller have higher dimensional accuracy than the grooves, therefore, preferably, the shape size of the grooves on the metal plate is larger than the shape size of the connecting ribs 302, and the occupied area of the connecting ribs 302 is smaller than the occupied area of the grooves in unit area, thus, the shape on most areas of the surface of the metal plate is the grooves, and the dimensional consistency of the grooves is better during pressing, so that the non-adhesion consistency of the whole liner is better; the ribs 302 on the surface of the metal sheet will be connected to each other while the grooves are relatively independent.

The connecting ribs 302 are connected with each other through the intersecting portions 304, in order to further reduce the area occupied by the connecting ribs 302 and increase the area occupied by the grooves, the groove side surface 303 is provided with a first side surface 3031 and a second side surface 3032, and the first side surface 3031 and the second side surface 3032 are in transitional connection at the intersecting portions 304 by an included angle, so that the grooves extend to the vicinity of the intersecting portions 304 as much as possible, the size of the intersecting portions 304 is reduced, and the area occupied by the grooves is further increased.

It should be appreciated that whether or not the groove side (first side 3031) and the groove side (second side 3032) transition at an angle can be seen as whether or not the groove side and the groove side can be approximately planar, for example, in the present application, the width dimension of the groove in the direction of the first side 3031 and the width dimension in the direction of the second side 3032 are relatively small, and the first side 3031 and the second side 3032 are both relatively straight, the first side 3031 extending generally toward one side of the groove and the second side 3032 extending generally toward the other side of the groove, which can be considered an angle transition for this purpose. When the side surfaces of the groove and the side surfaces of the groove are both obviously curved surfaces and the transition joint circular arc is smooth, the included angle cannot be obviously distinguished, and the transition is not included angle.

The depth of the first side 3031 or the second side 3032 at the cross connection position, namely the depth from the top of the groove to the transition position of the included angle, the central depth of the groove is the depth from the mouth of the groove to the center of the bottom 313 of the groove, and the two depths are more than or equal to 0.9 and less than 1.

The depth at the cross connection is close to the depth at the center of the bottom surface 313 of the groove, and the ratio is not less than 0.9, so that the depth dimension consistency of the groove is better, and the non-sticking performance of the liner is improved.

The width D3 of the connecting rib 302 is smaller than 1/3 of the width of the groove D1, so that the area of the groove is larger, and the dimensional consistency of the groove is better controlled during processing, so that the dimensional consistency of the whole liner is better, and the non-tackiness is better.

As shown in fig. 8, the inner container further includes at least an aluminum layer 312 and a stainless steel layer 311, where the stainless steel layer 311 and the aluminum layer 312 are combined to form a stainless steel composite board, the stainless steel layer 311 has a bonding surface 305 bonded to the aluminum layer 312, the bonding surface 305 includes a first bonding portion 3051 corresponding to a position where the groove is located, and a second bonding portion 3052 corresponding to the connecting rib 302, and a ratio of a distance of the first bonding portion 3051 relative to a bottom surface of the groove to a distance of the second bonding portion 3052 relative to an upper surface of the connecting rib 302 is: greater than 0.95 and less than or equal to 1.

During pressing, the stainless steel layer is pressed, and deformation may occur at the joint surface 305, and the ratio of the distance between the first joint portion 3051 and the bottom surface 313 of the groove to the distance between the second joint portion 3052 and the upper surface of the connecting rib 302 is: and the thickness of the stainless steel is more than 0.95 and less than or equal to 1, so that the stainless steel is uniform in thickness no matter which position is, uniform heat transfer is facilitated, and the inner wall of the liner is uniform in temperature and good in non-adhesive performance.

As shown in fig. 6, the width D1 of the connecting rib 302 is 0.1-0.4mm, and the width D1 of the groove is 0.2-0.8mm.

In the first embodiment, the liner includes a liner bottom wall 31 and a liner side wall 32, the groove on the liner bottom wall 31 is square, and the groove on the liner side wall 32 is diamond-shaped.

As shown in fig. 9, the liner of the second embodiment is drawn from the embossed metal plate material shown in the drawing. The grooves are communicated with each other, so that rice milk in the grooves can flow along the communicating grooves 307, and particularly for some inner containers with good inner container heating effect, the communicating grooves 307 can play a role of keeping a water film not easy to disappear because the bottom parts of the inner containers are easy to overheat; the independent bulges support rice, so that good heat transfer effect can be ensured. The first smooth surface and the second smooth surface that set up can make in the intercommunication recess attached starch wash away easily in the culinary art in-process, on the one hand, have reduced the food and have remained in the recess, on the other hand, have avoided the risk that the intercommunication recess blockked up for rice milk can flow in the intercommunication recess, and then guarantee that the inner bag non-viscosity can be kept in better state. Starch grains on the independent protrusions can be conveniently cleaned, food is not easy to remain, and good heat transfer performance of the protrusions can be ensured.

As shown in fig. 10, the communication groove 307 has a groove bottom surface 313 (second smooth surface 310), the communication groove 307 has a groove side surface 303 constituted by one side of the protrusion, and the groove side surface 303 extends in the depth direction of the communication groove 307 while being inclined to the outside in the width direction of the communication groove 307. Thus, in the cleaning process, the cleaning tool is convenient for cleaning the food remained in the independent grooves, so that the food residue is reduced.

The inclination of the groove side 303 cannot be too small, which can lead to the inability of manufacturing and processing the groove, easy dirt collection and difficult cleaning, and the inclination of the groove side 303 cannot be too large, so that the capacity of storing water or rice milk of the groove is reduced, and the problems of easy sticky rice and poor non-sticky performance are caused. When the depth h of the groove is smaller than 0.01, firstly, the volume of the groove is limited, so that the capacity of the groove for storing water or rice milk is reduced; when the depth h of the groove is greater than 0.05mm, on one hand, the groove is easy to collect dirt and the top of the protrusion or the connecting rib 302 is too thin, so that the strength of the protrusion or the connecting rib of the liner is not easy to wear.

The communication groove 307 has a mouth width D1 and a bottom width D2, the ratio of the mouth width to the bottom wall width beingThe method comprises the steps of carrying out a first treatment on the surface of the Where θ is the angle between the groove side 303 and groove bottom 313 and h is the groove height.

As shown in fig. 11, an inclined included angle θ is formed between the groove side surface 303 and the groove bottom surface 313, so that the groove is horn-shaped in the depth direction, and the included angle θ is controlled to be between 90 ° and 150 ° and h is controlled to be between 0.01 mm and 0.05mm in order to avoid excessive difference between the width of the mouth and the width of the bottom of the groove.

As shown in fig. 12, the communication groove 307 includes a cross communication portion 309, the groove side 303 further has a first side 3031 and a second side 3032 located on the same protrusion, the first side 3031 and the second side 3032 are cross-connected at the cross communication portion 309, and the depth of the first side 3031 or the second side 3032 at the cross connection is compared with the central depth of the communication groove 307 in the ratio: and 0.9 or more and less than 1.

The depth is close, and the rice paste in the groove can smoothly flow, so that the non-sticking effect of rice is improved.

In the second embodiment, as shown in fig. 11, the width D3 of the protrusion 306 is 0.2-0.8mm, and the width D1 of the communication groove 307 is 0.1-0.4mm. In the process of flowing rice milk, heat of the protrusions 306 is easily taken away, and in order to maintain good heat transfer effect, it is preferable that the width of the protrusions 306 is set larger, and the width of the communication grooves 307 is smaller than 1/3 of the width of the protrusions 306.

During processing, the grooves and the protrusions 306 are formed on the sheet material first and then stretched into the liner, so that the grooves or the protrusions 306 on the side wall 32 of the liner and the grooves or the protrusions 306 on the bottom wall 31 of the liner are different in appearance.

Specifically, the liner includes a liner bottom wall 31 and a liner side wall 32, the communicating groove 307 of the liner bottom wall 31 and the communicating groove 307 on the liner side wall 32 are mutually communicated, and the communicating groove 307 on the liner side wall 32 is diamond-shaped.

Macroscopically, the protrusions 306 on the side wall 32 of the liner are diamond-shaped, the communicating grooves 307 beside the protrusions 306 are diamond-shaped, the included angle between the first side surface 3031 and the second side surface 3032 may be greater than 90 degrees, and may be smaller than 90 degrees, and in any case, the diamond-shaped communicating grooves 307 can improve the smooth transportation of rice milk or water of the side wall 32 of the liner in the direction of the bottom wall 31 of the liner, so as to maintain the nonstick performance at the bottom wall 31 of the liner.

The liner further comprises an aluminum layer 312 and a stainless steel layer 311, the stainless steel layer 311 and the aluminum layer 312 are combined to form a stainless steel composite board, the stainless steel layer 311 is provided with a combining surface 305 combined with the aluminum layer 312, the combining surface 305 comprises a first combining part 3051 corresponding to the position of the communication groove 307 and a second combining part 3052 corresponding to the protrusion 306, and the ratio of the distance of the first combining part 3051 relative to the bottom wall of the groove to the distance of the second combining part 3052 relative to the upper surface of the protrusion 306 is as follows: greater than 0.95 and less than or equal to 1. The specific effects are described in the first embodiment. The roughness of the second smooth surface 310 and the first smooth surface 320 is Ra2-9 μm.

The non-mentioned places in the application can be realized by adopting or referring to the prior art.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

1. A manufacturing method of an inner container is characterized in that the surface of a metal plate is polished to form a smooth surface, embossing is carried out on the smooth surface to form a plurality of independent quadrilateral grooves, the depth of each quadrilateral independent groove is 0.01-0.05 mm, and the width of each quadrilateral independent groove is 0.3-0.6 mm; smooth ribs are formed between adjacent independent grooves, and the width of each smooth rib is 0.1mm-0.3mm;

and stretching the metal plate provided with a plurality of independent grooves and smooth ribs to form the liner.

2. The method of manufacturing a liner of claim 1, wherein the embossing step comprises:

3. The method of manufacturing a liner according to claim 1, wherein the processing of the stretched liner further comprises:

and (3) secondary polishing is carried out on the inner surface of the formed liner, which is provided with a plurality of independent grooves and smooth ribs.

4. The method of manufacturing a liner according to claim 1, further comprising, after the step of obtaining the grooves and smooth ribs:

and (3) coating the surface with the grooves and the smooth ribs to protect the surface of the metal plate with the grooves and the smooth ribs.

5. The method of manufacturing a liner according to claim 4, wherein the step of processing the liner before stretching further comprises:

removing the protective film covered on the metal plate;

and stretching the metal plate from which the protective film is removed.

6. The method for manufacturing a liner according to claim 1, wherein,

the surface roughness of the smooth surface formed by polishing the surface of the metal plate is smaller than that of the inner surface of the liner after molding.

7. The method of claim 1, wherein the surface roughness Ra of the bottom surface of the groove is 2-9 μm; the surface roughness Ra of the upper surface of the smooth rib is 2-9 mu m.

8. The method of claim 7, wherein the surface roughness Ra of the bottom surface of the groove is 6-9 μm; the surface roughness Ra of the upper surface of the smooth rib is 3-8 mu m.

9. The method of claim 1, wherein the smooth rib has a smaller area than the groove.

10. The rice cooking utensil comprises a pot cover and a pot body, and is characterized in that the pot body is internally provided with an inner container manufactured by the inner container manufacturing method according to any one of claims 1-9, a metal cover plate is arranged on the pot cover and provided with a sealing ring, the inner container edge of the inner container is provided with a flanging, the upper surface of the flanging is a plane with a groove removed through polishing, and the sealing ring is abutted against the plane.