Composite flat-bottomed aluminum pan and preparation process thereof

Abstract

The present invention discloses a composite flat-bottomed aluminum pot, comprising an aluminum pot body and a magnetic conductive sheet embedded in the bottom of the aluminum pot body, the edge of the magnetic conductive sheet is covered and fixed in the bottom of the aluminum pot body, the upper end surface of the magnetic conductive sheet is arranged parallel to the outer bottom surface of the aluminum pot body, a positioning hole is arranged at the center of the magnetic conductive sheet, a plurality of oblong holes are arranged radially along the positioning hole toward the edge of the magnetic conductive sheet, waist-shaped holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet between adjacent oblong holes, the edges of the oblong holes and the waist-shaped holes are extended toward the outer bottom surface of the aluminum pot body to form steps, one end of the step close to the outer bottom surface of the aluminum pot body is flush with the outer bottom surface of the aluminum pot body, and a plurality of riveted through holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet. The present invention solves the problems of the prior art that the pot bottom has bulges, small contact area, poor thermal conductivity, and is not easy to clean.

Description

Technical Field

[0001] The invention relates to the technical field of kitchenware equipment, in particular to a composite flat-bottomed aluminum pan and a preparation process thereof. Background Art

[0002] Aluminum has excellent thermal conductivity, which is 16 times that of stainless steel. It is also very easy to shape, so aluminum pots came into being. Aluminum pots are lightweight, durable, heat quickly, conduct heat evenly, and do not rust. However, pure aluminum pots cannot be used in induction cookers. Because when an induction cooker heats food, it uses a coil inside the induction cooker, which will generate a changing magnetic field when a changing current passes through it. When the iron pot is placed on the induction cooker, these magnetic fields will penetrate into the iron. Because iron is magnetic, the magnetic field will cause the electrons in the iron to move, thereby achieving the heating function. Aluminum is not magnetic, and the magnetic field in the aluminum will not cause the electrons to move, so the aluminum pot cannot be heated. The solution is to add a magnetic conductive plate to the bottom of the aluminum pot.

[0003] A Chinese invention patent with the authorization announcement number CN103192059B discloses a method for manufacturing an energy-saving aluminum pot for a gravity casting induction cooker, which comprises: 1. preparing a material such as aluminum alloy cast on the bottom of the pot; Figure 1 The stainless iron plate shown; 2. Prepare a mold that matches the stainless iron plate; 3. Gravity casting process, wherein the gravity casting process includes: (1) the pot body and the stainless iron plate forming process; (2) rivet treatment on the bottom of the pot body; (3) surface treatment of shrinkage holes on the casting surface. The gravity casting process of this method: (1) During the forming process of the pot body and the stainless iron plate, the flowing aluminum liquid passes through the special three-dimensional stainless iron plate to form rivets, and the pot body and the stainless iron plate are formed at one time; although, in the subsequent (2) rivet treatment on the bottom of the pot body and (3) surface treatment of shrinkage holes on the casting surface, the aluminum rivets and long strips are extruded at one time to achieve a high consistency and regular order, and the height of the aluminum rivets and the convex strips is within the tolerance range of 1mm plus or minus 0.5mm based on the stainless iron plate; however, the energy-saving aluminum pot for induction cookers prepared by this method has the following shortcomings: Figure 2 As shown, the protrusions formed by the rivets and strips cause the contact area of ​​the bottom of the pot to become smaller. Especially during long-term use, the protrusions formed by the rivets and strips on the edge of the bottom of the pot are prone to wear, resulting in an uneven bottom and poor thermal conductivity, which affects the uniformity of heating and the service life; gaps are formed between the rivets and the strips, which are prone to the adhesion of oil smoke and dust, making them not only difficult to clean, but also further affecting the uniformity of heating and the service life of the bottom of the pot. Summary of the invention

[0004] The object of the present invention is to provide a composite flat-bottomed aluminum pan to solve the problems raised in the above background technology.

[0005] Another object of the present invention is to provide a preparation process of a composite flat-bottomed aluminum pan.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Solution 1

[0008] A composite flat-bottomed aluminum pot comprises an aluminum pot body and a magnetic conductive sheet embedded in the bottom of the aluminum pot body, the edge of the magnetic conductive sheet is covered and fixed in the bottom of the aluminum pot body, the upper end surface of the magnetic conductive sheet is arranged parallel to the outer bottom surface of the aluminum pot body and spaced apart, a positioning hole is arranged in the center of the magnetic conductive sheet, a plurality of oblong holes are arranged radially along the positioning hole toward the edge of the magnetic conductive sheet, waist-shaped holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet between adjacent oblong holes, the edges of the oblong holes and the waist-shaped holes are extended toward the outer bottom surface of the aluminum pot body to form steps, one end of the step close to the outer bottom surface of the aluminum pot body is flush with the outer bottom surface of the aluminum pot body, and a plurality of riveted through holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet.

[0009] The edge of the positioning hole extends toward the outer bottom surface of the aluminum pot body to form a plurality of reeds, and the reeds are slightly inclined toward the center of the outer bottom surface of the aluminum pot body.

[0010] Wherein, the riveting through holes are arranged at both ends of the oblong hole and the waist-shaped hole.

[0011] Wherein, the edge of the magnetic conductive sheet extends toward the outer bottom surface of the aluminum pot body to form an annular hoop.

[0012] Wherein, one end of the oblong hole close to the edge of the magnetic conductive sheet is provided with an opening extending to the annular hoop.

[0013] Solution 2

[0014] A preparation process of a composite flat-bottomed aluminum pan comprises the following steps:

[0015] Step 1: Prepare the magnetic conductive sheet in the composite flat-bottomed aluminum pan

[0016] A whole piece of stainless steel plate is punched, wherein a positioning hole is arranged at the center of the magnetic conductive sheet, and the edge of the positioning hole extends toward the outer bottom surface of the aluminum pot body to form a plurality of spring sheets, and the spring sheets are slightly inclined toward the center of the outer bottom surface of the aluminum pot body; a plurality of oblong holes are arranged radially along the positioning hole toward the edge of the magnetic conductive sheet, and waist-shaped holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet between adjacent oblong holes, and the edges of the oblong holes and waist-shaped holes are extended toward the outer bottom surface of the aluminum pot body to form steps, and a plurality of riveted through holes are arranged circumferentially along the positioning hole toward the edge of the magnetic conductive sheet; the riveted through holes are arranged at both ends of the oblong holes and the waist-shaped holes; the edge of the magnetic conductive sheet extends toward the outer bottom surface of the aluminum pot body to form an annular hoop; an end of the oblong hole close to the edge of the magnetic conductive sheet is provided with an opening extending to the annular hoop;

[0017] Step 2: Positioning and clamping the mold

[0018] The magnetic conductive sheet is placed in a mold, which includes an upper mold and a lower mold. A positioning column corresponding to the positioning hole is arranged at the center of the bottom of the upper mold, and exhaust holes are arranged around the positioning column. The above mold is installed on a casting machine, the upper mold and the lower mold are separated and emptied, the inner cavity of the mold is baked, and the magnetic conductive sheet is directly positioned on the positioning column in the upper mold. The spring sheet is tightened to the positioning column by tension, and then the upper and lower molds are precisely aligned.

[0019] Step 3: Casting

[0020] Molten aluminum liquid is injected, and the flowing aluminum liquid passes through the riveting holes to form rivets, and the aluminum liquids at multiple rivets are connected together, so that the magnetic conductive sheet and the aluminum pot body are formed in one piece;

[0021] Step 4: Polishing

[0022] Remove excess aluminum residue, input programming into the CNC lathe according to product processing standards and relevant drawing dimensions, place the aluminum pot on the lathe mold for internal and external processing, remove the rough shrinkage surface produced by casting, and process the outer bottom surface of the aluminum pot body with the upper end surface of the magnetic conductive sheet as the reference. The end of the step close to the outer bottom surface of the aluminum pot body is flush with the outer bottom surface of the aluminum pot body, and the height is within the tolerance range of 1mm plus or minus 0.5mm; and the annular hoop is treated in the same way.

[0023] Furthermore, in step 2, the mold further includes a magnetic conductive rod and a magnetic copper coil group, and four magnetic conductive rods are embedded in the upper mold, wherein a portion of the four magnetic conductive rods are exposed outside the upper mold, and the four magnetic conductive rods exposed outside the upper mold are connected to the magnetic copper coil group in groups of two;

[0024] In step 3, after the spring sheet is fixed to the positioning column by tension, the magnetic copper coil assembly is energized to absorb the magnetic conductive sheet into the upper mold.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The pot bottom of the prior art has bulges: small contact area, poor thermal conductivity, and difficult to clean; the pot bottom of the present invention is polished to form a plane, with a large contact area, good thermal conductivity, and easy cleaning.

[0027] 2. The prior art uses a press-attached bottom process. Due to the difference in thermal conductivity caused by the different materials of aluminum and stainless steel at the bottom of the pot, thermal expansion and contraction are not synchronized, and the pot tends to fall off more easily as it is used for a longer time. The present invention uses positioning buckle riveting, which is firm and not easy to fall off.

[0028] 3. The edges of the oblong hole and the waist-shaped hole of the present invention extend toward the outer bottom surface of the aluminum pot body to form a step. One end of the step close to the outer bottom surface of the aluminum pot body is flush with the outer bottom surface of the aluminum pot body, so that the magnetic conductive sheet can be in direct contact with the induction cooker, which not only increases the magnetic conductivity, but also further strengthens the mechanical strength of the outer bottom surface of the aluminum pot body.

[0029] 4. When the magnetic conductive sheet of the present invention is heated, the oblong holes and waist-shaped holes are easily deformed due to uneven heating. Such arrangement of the riveted through holes helps to release the stress caused by thermal expansion and contraction.

[0030] 5. The edge of the magnetic conductive sheet of the present invention extends toward the outer bottom surface of the aluminum pot body to form an annular hoop, which further increases the magnetic conductivity and strengthens the mechanical strength of the outer bottom surface of the aluminum pot body.

[0031] 6. The opening of the annular hoop of the present invention helps to release the stress caused by uneven heating of the annular hoop, thereby increasing the service life of the composite flat-bottomed aluminum pot.

[0032] 7. During the preparation process, the present invention further strengthens the connection between the magnetic conductive sheet and the upper mold through magnetic adsorption, making it difficult to shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the stainless iron plate in the prior art;

[0034] Figure 2 It is a cross-sectional schematic diagram of a protrusion formed by a rivet and a long strip in the prior art;

[0035] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the magnetic conductive sheet of the present invention;

[0037] Figure 5 It is a partial cross-sectional schematic diagram of the magnetic conductive sheet of the present invention;

[0038] Figure 6 It is a flow chart of the preparation process of the present invention.

[0039] In the figure: 1-aluminum pot body, 2-magnetic conductive sheet, 3-positioning hole, 4-long round hole, 5-waist-shaped hole, 6-step, 7-rivet through hole, 8-spring, 9-annular hoop, 10-opening. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 3-5 , an embodiment of the present invention: a composite flat-bottomed aluminum pot, comprising an aluminum pot body 1 and a magnetic conductive sheet 2 embedded in the bottom of the aluminum pot body 1, the edge of the magnetic conductive sheet 2 is covered and fixed in the bottom of the aluminum pot body 1, the upper end surface of the magnetic conductive sheet 2 is parallel to the outer bottom surface of the aluminum pot body 1 and is arranged at intervals, a positioning hole 3 is arranged in the center of the magnetic conductive sheet 2, a plurality of oblong holes 4 are radially arranged along the positioning hole 3 toward the edge of the magnetic conductive sheet 2, and waist-shaped holes 5 are circumferentially arranged along the positioning hole 3 toward the edge of the magnetic conductive sheet 2 between adjacent oblong holes 4, the edges of the oblong holes 4 and the waist-shaped holes 5 are extended toward the outer bottom surface of the aluminum pot body 1 to form a step 6, and one end of the step 6 close to the outer bottom surface of the aluminum pot body 1 is flush with the outer bottom surface of the aluminum pot body 1, so that the magnetic conductive sheet 2 can be in direct contact with the induction cooker, which not only increases the magnetic conductivity, but also further strengthens the mechanical strength of the outer bottom surface of the aluminum pot body 1, and a plurality of riveting through holes 7 are circumferentially arranged along the positioning hole 3 toward the edge of the magnetic conductive sheet 2.

[0042] The edge of the positioning hole 3 extends toward the outer bottom surface of the aluminum pot body 1 to form a plurality of reeds 8 , and the reeds 8 are slightly inclined toward the center of the outer bottom surface of the aluminum pot body 1 .

[0043] Among them, the riveted through holes 7 are arranged at both ends of the oblong hole 4 and the waist-shaped hole 5. When the magnetic conductive sheet 2 is heated, the oblong hole 4 and the waist-shaped hole 5 are easily deformed due to uneven heating. The riveted through holes 7 are arranged in this way to help release the stress caused by thermal expansion and contraction.

[0044] The edge of the magnetic conductive sheet 2 extends toward the outer bottom surface of the aluminum pot body 1 to form an annular hoop 9, which further increases the magnetic conductivity and strengthens the mechanical strength of the outer bottom surface of the aluminum pot body 1.

[0045] Among them, one end of the oblong hole 4 close to the edge of the magnetic conductive sheet 2 is provided with an opening 10 extending to the annular hoop 9. The setting of the opening 10 helps to release the stress caused by uneven heating of the annular hoop 9 and increase the service life of the composite flat-bottomed aluminum pot.

[0046] A preparation process of a composite flat-bottomed aluminum pan, such as Figure 6 As shown, the following steps are included:

[0047] Step 1: Preparation of magnetic conductive sheet in composite flat-bottom aluminum pan

[0048] A whole piece of stainless steel plate is punched, wherein a positioning hole 3 is provided at the center of the magnetic conductive sheet 2, and the edge of the positioning hole 3 extends toward the outer bottom surface of the aluminum pot body 1 to form a plurality of reeds 8, and the reeds 8 are slightly inclined toward the center of the outer bottom surface of the aluminum pot body 1; a plurality of oblong holes 4 are radially provided along the positioning hole 3 toward the edge of the magnetic conductive sheet 2, and waist-shaped holes 5 are circumferentially provided along the positioning hole 3 toward the edge of the magnetic conductive sheet 2 between adjacent oblong holes 4, and the edges of the oblong holes 4 and the waist-shaped holes 5 are extended toward the outer bottom surface of the aluminum pot body 1 to form steps 6, and a plurality of riveted through holes 7 are circumferentially provided along the positioning hole 3 toward the edge of the magnetic conductive sheet 2; the riveted through holes 7 are provided at both ends of the oblong holes 4 and the waist-shaped holes 5; the edge of the magnetic conductive sheet 2 extends toward the outer bottom surface of the aluminum pot body 1 to form an annular hoop 9; an end of the oblong hole 4 close to the edge of the magnetic conductive sheet 2 is provided with an opening 10 extending to the annular hoop 9;

[0049] Step 2: Positioning and clamping the mold

[0050] The magnetic conductive sheet 2 is placed in a mold, which includes an upper mold and a lower mold. A positioning column corresponding to the positioning hole 3 is arranged at the center of the bottom of the upper mold, and exhaust holes are arranged around the positioning column. The above mold is installed on a casting machine, the upper mold and the lower mold are separated and emptied, and the inner cavity of the mold is baked. The magnetic conductive sheet 2 is directly positioned on the positioning column in the upper mold, and the spring sheet 8 is tightened to the positioning column by tension, and then the upper and lower molds are precisely aligned.

[0051] Step 3: Casting

[0052] The molten aluminum liquid is injected, and the flowing aluminum liquid passes through the riveting through hole 7 to form a rivet, and the aluminum liquid at multiple rivets is connected together, so that the magnetic conductive sheet 2 and the aluminum pot body 1 are formed into one piece;

[0053] Step 4: Polishing

[0054] Remove excess aluminum residue, program and input the CNC lathe according to product processing standards and relevant drawing dimensions, place the aluminum pot on the lathe mold for internal and external processing, remove the rough shrinkage surface produced by casting, and process the outer bottom surface of the aluminum pot body 1. Take the upper end surface of the magnetic conductive sheet 2 as the reference, and the end of the step 6 close to the outer bottom surface of the aluminum pot body 1 is flush with the outer bottom surface of the aluminum pot body 1, and the height is within the tolerance range of 1mm plus or minus 0.5mm; and perform the same treatment on the annular hoop 9.

[0055] In another embodiment, in step 2, the mold further includes a magnetic conductive rod and a magnetic copper coil group, and four magnetic conductive rods are embedded in the upper mold, wherein a portion of the four magnetic conductive rods are exposed outside the upper mold, and the four magnetic conductive rods exposed outside the upper mold are connected to the magnetic copper coil group in groups of two;

[0056] In step 3, after the spring sheet 8 is tightened by tension to fix the positioning column, the magnetic copper coil assembly is energized to adsorb the magnetic sheet 2 in the upper mold. This embodiment further strengthens the connection between the magnetic sheet 2 and the upper mold through magnetic adsorption, making it difficult to shift.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite flat-bottomed aluminum pan, characterized in that: The invention comprises an aluminum pot body (1) and a magnetic conductive sheet (2) embedded in the bottom of the aluminum pot body (1), the edge of the magnetic conductive sheet (2) is wrapped and fixed in the bottom of the aluminum pot body (1), the upper end surface of the magnetic conductive sheet (2) is arranged parallel to and spaced from the outer bottom surface of the aluminum pot body (1), a positioning hole (3) is arranged at the center of the magnetic conductive sheet (2), a plurality of oblong holes (4) are arranged radially along the positioning hole (3) toward the edge of the magnetic conductive sheet (2), waist-shaped holes (5) are arranged circumferentially along the positioning hole (3) toward the edge of the magnetic conductive sheet (2) between adjacent oblong holes (4), the edges of the oblong holes (4) and the waist-shaped holes (5) are extended toward the outer bottom surface of the aluminum pot body (1) to form a step (6), one end of the step (6) close to the outer bottom surface of the aluminum pot body (1) is flush with the outer bottom surface of the aluminum pot body (1), and a plurality of riveted through holes (7) are arranged circumferentially along the positioning hole (3) toward the edge of the magnetic conductive sheet (2); The riveting through holes (7) are arranged at both ends of the oblong hole (4) and the waist-shaped hole (5); The edge of the positioning hole (3) extends toward the outer bottom surface of the aluminum pot body (1) to form a plurality of reeds (8), and the reeds (8) are slightly inclined toward the center of the outer bottom surface of the aluminum pot body (1); The edge of the magnetic conductive sheet (2) extends toward the outer bottom surface of the aluminum pot body (1) to form an annular hoop (9); An end of the oblong hole (4) close to the edge of the magnetic conductive sheet (2) is provided with an opening (10) extending to the annular hoop (9); The composite flat-bottomed aluminum pan is made by the following preparation process, including the following steps: Step 1: Prepare magnetic conductive sheet A whole piece of stainless steel plate is punched, wherein a positioning hole (3) is arranged at the center of the magnetic conductive sheet (2), and the edge of the positioning hole (3) extends toward the outer bottom surface of the aluminum pot body (1) to form a plurality of reeds (8), and the reeds (8) are slightly inclined toward the center of the outer bottom surface of the aluminum pot body (1); a plurality of oblong holes (4) are arranged radially along the edge of the positioning hole (3) toward the magnetic conductive sheet (2), and waist-shaped holes (5) are arranged circumferentially along the edge of the positioning hole (3) toward the magnetic conductive sheet (2) between adjacent oblong holes (4), and the oblong holes (4) and the waist-shaped holes (5) are arranged radially along the edge of the positioning hole (3) toward the magnetic conductive sheet (2). The edges of the shaped holes (5) extend toward the outer bottom surface of the aluminum pot body (1) to form a step (6); a plurality of riveted through holes (7) are arranged along the circumference of the edge of the positioning hole (3) toward the magnetic conductive sheet (2); the riveted through holes (7) are arranged at both ends of the oblong hole (4) and the waist-shaped hole (5); the edge of the magnetic conductive sheet (2) extends toward the outer bottom surface of the aluminum pot body (1) to form an annular hoop (9); an end of the oblong hole (4) close to the edge of the magnetic conductive sheet (2) is provided with an opening (10) extending to the annular hoop (9); Step 2: Positioning and clamping the mold The magnetic conductive sheet (2) is placed in a mold, the mold comprising an upper mold and a lower mold, a positioning column corresponding to the positioning hole (3) is arranged at the center of the bottom of the upper mold, and exhaust holes are arranged around the positioning column; the above-mentioned mold device is mounted on a casting machine, the upper mold and the lower mold are separated and emptied, the inner cavity of the mold is baked, the magnetic conductive sheet (2) is directly positioned on the positioning column in the upper mold, the spring sheet (8) is tightened to the positioning column by tension, and then the upper and lower molds are precisely aligned; the mold also comprises a magnetic conductive rod and a magnetic copper coil group, four magnetic conductive rods are embedded in the upper mold, wherein a part of the four magnetic conductive rods are exposed outside the upper mold, and the four magnetic conductive rods exposed outside the upper mold are connected to the magnetic copper coil group in groups of two; Step 3: Casting Molten aluminum liquid is injected, and the flowing aluminum liquid passes through the riveting through hole (7) to form a rivet, and the aluminum liquid at multiple rivets is connected together, so that the magnetic conductive sheet (2) and the aluminum pot body (1) are integrally formed; after the reed sheet (8) is tightened to the positioning column by tension, the magnetic copper coil group is energized to absorb the magnetic conductive sheet (2) into the upper mold; Step 4: Polishing Remove excess aluminum residue, program and input the CNC lathe according to the product processing standards and relevant drawing dimensions, place the aluminum pot on the lathe mold for internal and external processing, remove the rough shrinkage surface produced by casting, and when processing the outer bottom surface of the aluminum pot body (1), use the upper end surface of the magnetic conductive sheet (2) as a reference, and the end of the step (6) close to the outer bottom surface of the aluminum pot body (1) is flush with the outer bottom surface of the aluminum pot body (1), and the height is within the tolerance range of 1mm plus or minus 0.5mm; and the annular hoop (9) is processed in the same way.

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