A kind of bottom large area magnetic aluminum pot and its casting process

Abstract

The present invention discloses a magnetic aluminum pot with a large bottom area, comprising an aluminum pot body and a magnetic conductive sheet group embedded in the bottom of the aluminum pot body, the magnetic conductive sheet group comprising a plurality of magnetic conductive sheets with the same structure located in the same horizontal plane and arranged around, the lower end surface of the magnetic conductive sheet being arranged parallel and spaced apart from the outer bottom surface of the aluminum pot body, a first positioning hole being arranged on one side of the magnetic conductive sheet, a plurality of oblong holes being arranged radially along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet, a plurality of waist-shaped holes and a plurality of riveted through holes being arranged circumferentially along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet between adjacent oblong holes, a plurality of bosses being arranged on the outer bottom of the aluminum pot body corresponding to the oblong holes, waist-shaped holes and riveted through holes, respectively, the bosses being riveted to the inner bottom of the aluminum pot body. The present invention can be applied to pot bottoms with a diameter greater than 190 mm, and is not easy to be bulged and deformed, and will not cause the pot bottom to be uneven.

Description

Technical Field

[0001] The invention relates to the technical field of kitchenware equipment, in particular to a magnetic aluminum pot with a large bottom area and a casting 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 matching the stainless iron plate; 3. Gravity casting process, wherein the gravity casting process includes: (1) the process of forming the pot body and the stainless iron plate; (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 strips are extruded at one time to achieve a uniform height 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: the maximum range can only be about 190mm, and when applied to aluminum pots with larger diameters, it is easy to bulge and deform, resulting in an uneven bottom of the pot. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetic conductive aluminum pot with a large bottom area to solve the problems raised in the above background technology.

[0005] Another object of the present invention is to provide a casting process for a magnetic aluminum pot with a large bottom area.

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

[0007] Solution 1

[0008] A magnetic aluminum pot with a large bottom area comprises an aluminum pot body and a magnetic sheet group embedded in the bottom of the aluminum pot body, the magnetic sheet group comprises a plurality of magnetic sheets with the same structure located in the same horizontal plane and arranged around, the lower end faces of the magnetic sheets are arranged parallel to and spaced from the outer bottom surface of the aluminum pot body, a first positioning hole is arranged on one side of the magnetic sheet, a plurality of oblong holes are arranged radially along the center of the magnetic sheet group toward the edge of the magnetic sheet, a plurality of waist-shaped holes and a plurality of riveted through holes are arranged circumferentially along the center of the magnetic sheet group toward the edge of the magnetic sheet between adjacent oblong holes, a plurality of bosses are arranged on the outer bottom of the aluminum pot body corresponding to the oblong holes, the waist-shaped holes and the riveted through holes, respectively, and the bosses are riveted to the inner bottom of the aluminum pot body.

[0009] Wherein, the edges of the oblong hole and the waist-shaped hole are bent toward the inner bottom surface of the aluminum pot body to form an annular hoop.

[0010] Wherein, the first positioning hole is a rectangular hole.

[0011] Wherein, a second positioning hole is provided at the edge of the magnetic conductive sheet corresponding to the oblong hole.

[0012] Wherein, the second positioning hole is a semicircular hole.

[0013] Solution 2

[0014] A casting process for a magnetic aluminum pot with a large bottom area, comprising the following steps:

[0015] Step 1: Prepare magnetic conductive sheet

[0016] Take a whole piece of stainless steel plate for stamping, wherein a first positioning hole is provided on one side of the magnetic conductive sheet, the first positioning hole is a rectangular hole, a plurality of oblong holes are radially provided along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet, a plurality of waist-shaped holes and a plurality of riveted through holes are circumferentially provided along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet between adjacent oblong holes, the edges of the oblong holes and the waist-shaped holes are bent toward the inner bottom surface of the aluminum pot body to form an annular hoop, a second positioning hole is provided on the edge of the magnetic conductive sheet corresponding to the oblong hole, the second positioning hole is a semicircular hole; stamp several pieces according to the product requirements;

[0017] Step 2: Positioning and clamping the mold

[0018] A plurality of magnetic conductive sheets are placed in a mold in a surrounding manner and placed in the same horizontal plane to form a magnetic conductive sheet group. The mold includes an upper mold, a lower mold, a magnetic conductive rod and a magnetic copper coil group. An insert is provided at the bottom of the upper mold. The insert is provided with a clearance hole that matches the shape of the boss at the outer bottom of the aluminum pot body. The clearance hole is provided with an exhaust nail. The insert is the same shape as the magnetic conductive sheet group but slightly larger in size. Four magnetic conductive rods are embedded in the insert in the upper mold. A part of the four magnetic conductive rods is embedded in the insert, and a part is exposed outside the upper mold. The bare The four magnetic rods exposed outside the upper mold are connected to the magnetic copper coil group in groups of two, and the insert is provided with positioning holes corresponding to the first positioning hole and the second positioning hole respectively; the above mold is installed on the casting machine, the upper mold and the lower mold are separated and emptied, the inner cavity of the mold is heated to 210℃~300℃, the magnetic sheet group is directly positioned on the positioning hole of the insert in the upper mold with a positioning fixture, and then the copper coil on the mold is energized to adsorb the magnetic sheet group on the insert in the upper mold, the positioning fixture is taken out, and then the upper and lower molds are precisely aligned.

[0019] Step 3: Casting

[0020] Molten aluminum is injected, and the flowing aluminum passes through the riveting holes to form rivets, thereby forming the pot body and the magnetic conductive sheet assembly at one time.

[0021] Step 4: Polishing

[0022] First, use a sawing machine to remove excess aluminum residue, and use a hydraulic press to extrude the uneven and irregular rivets on the bottom of the pot to form a boss, and achieve consistent height and regular order. According to the product processing standards and relevant drawing dimensions, program and input the CNC lathe, place the aluminum pot on the lathe mold, and use a diamond knife to process the inside and outside to remove the rough shrinkage surface produced by casting. When processing the outer bottom surface of the aluminum pot body, the lower end surface of the magnetic conductive sheet is used as the reference, and the boss height is within the tolerance range of 1mm plus or minus 0.5mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The maximum range of the pot bottom in the prior art can only be about 190mm. When applied to aluminum pots with a larger diameter, it is easy to bulge and deform, resulting in an uneven pot bottom. The present invention can be applied to pot bottoms with a diameter greater than 190mm, and is not easy to bulge and deform, and will not cause an uneven pot bottom.

[0025] 2. The edge of the magnetic conductive sheet of the present invention is bent toward the inner bottom surface of the aluminum pot body to form an annular hoop, which further enhances the mechanical strength of the bottom of the aluminum pot body.

[0026] 3. The first positioning hole of the present invention is a rectangular hole, which helps to prevent the radial displacement of the magnetic conductive sheet during casting.

[0027] 4. The second positioning hole of the present invention is a semicircular hole, which helps to prevent the magnetic conductive sheet from circumferential displacement during casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the stainless iron plate in the prior art;

[0029] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the magnetic conductive sheet assembly of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the magnetic conductive sheet of the present invention;

[0032] Figure 5 It is a partial cross-sectional schematic diagram of the magnetic conductive sheet of the present invention;

[0033] Figure 6 It is a casting process flow chart of the present invention.

[0034] In the figure: 1-aluminum pot body, 2-magnetic conductive sheet, 3-first positioning hole, 4-long round hole, 5-waist-shaped hole, 6-rivet through hole, 7-boss, 8-annular hoop, 9-second positioning hole. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 2-5 An embodiment of the present invention is a magnetic aluminum pot with a large bottom area, characterized in that it includes an aluminum pot body 1 and a magnetic conductive sheet group embedded in the bottom of the aluminum pot body 1, the magnetic conductive sheet group includes a plurality of magnetic conductive sheets 2 with the same structure located in the same horizontal plane and arranged around, the lower end surface of the magnetic conductive sheet 2 is arranged parallel to the outer bottom surface of the aluminum pot body 1 and spaced apart, a first positioning hole 3 is arranged on one side of the magnetic conductive sheet 2, a plurality of oblong holes 4 are radially arranged along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet 2, a plurality of waist-shaped holes 5 and a plurality of riveted through holes 6 are circumferentially arranged between adjacent oblong holes 4 along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet 2, a plurality of bosses 7 are arranged on the outer bottom of the aluminum pot body 1 corresponding to the oblong holes 4, the waist-shaped holes 5 and the riveted through holes 6, and the bosses 7 are riveted to the inner bottom of the aluminum pot body 1.

[0037] The edges of the oblong hole 4 and the waist-shaped hole 5 are bent toward the inner bottom surface of the aluminum pot body 1 to form an annular hoop 8, which further enhances the mechanical strength of the bottom of the aluminum pot body.

[0038] The first positioning hole 3 is a rectangular hole, which helps to prevent the magnetic conductive sheet from radially shifting during casting.

[0039] Wherein, a second positioning hole 9 is provided at the edge of the magnetic conductive sheet 2 corresponding to the oblong hole 4 .

[0040] The second positioning hole 9 is a semicircular hole, which helps to prevent the magnetic conductive sheet from circumferential displacement during casting.

[0041] A casting process for a large-area magnetic aluminum pot at the bottom, such as Figure 6 As shown, the following steps are included:

[0042] Step 1: Prepare magnetic conductive sheet

[0043] Take a whole piece of stainless steel plate for stamping, wherein a first positioning hole 3 is provided on one side of the magnetic conductive sheet 2, the first positioning hole 3 is a rectangular hole, a plurality of oblong holes 4 are radially provided along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet 2, a plurality of waist-shaped holes 5 and a plurality of riveted through holes 6 are circumferentially provided between adjacent oblong holes 4 along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet 2, the edges of the oblong holes 4 and the waist-shaped holes 5 are bent toward the inner bottom surface of the aluminum pot body 1 to form an annular hoop 8, the edge of the magnetic conductive sheet 2 is provided with a second positioning hole 9 corresponding to the oblong hole 4, the second positioning hole 9 is a semicircular hole; stamp several pieces according to the requirements of the product;

[0044] Step 2: Positioning and clamping the mold

[0045] A plurality of magnetic conductive sheets 2 are placed in a mold in a surrounding manner and placed in the same horizontal plane to form a magnetic conductive sheet group. The mold includes an upper mold, a lower mold, a magnetic conductive rod and a magnetic copper coil group. An insert is provided at the bottom of the upper mold. The insert is provided with a clearance hole that matches the shape of the boss 7 at the outer bottom of the aluminum pot body 1. The clearance hole is provided with an exhaust nail. The insert is the same shape as the magnetic conductive sheet group but slightly larger in size. Four magnetic conductive rods are embedded in the insert in the upper mold. A part of the four magnetic conductive rods is embedded in the insert, and a part is exposed outside the upper mold. The four magnetic rods exposed outside the upper mold are connected to the magnetic copper coil group in groups of two, and the insert is provided with positioning holes corresponding to the first positioning hole 3 and the second positioning hole 9 respectively; the above mold is installed on the casting machine, the upper mold and the lower mold are separated and emptied, the inner cavity of the mold is heated to 210℃~300℃, the magnetic sheet group is directly positioned on the positioning hole of the insert in the upper mold with a positioning fixture, and then the copper coil on the mold is energized to adsorb the magnetic sheet group on the insert in the upper mold, the positioning fixture is taken out, and then the upper and lower molds are precisely aligned.

[0046] Step 3: Casting

[0047] Molten aluminum is injected, and the flowing aluminum passes through the riveting through hole 6 to form a rivet, thereby forming the pot body and the magnetic conductive sheet assembly at one time.

[0048] Step 4: Polishing

[0049] First, use a sawing machine to remove excess aluminum residue, and use a hydraulic press to extrude the uneven and irregular rivets on the bottom of the pot to form a boss 7, and achieve a consistent height and regular order. According to the product processing standards and related drawing dimensions, program and input the CNC lathe, place the aluminum pot on the lathe mold, and use a diamond knife to process the inside and outside to remove the rough shrinkage surface produced by casting. When processing the outer bottom surface of the aluminum pot body 1, the lower end surface of the magnetic conductive sheet 2 is used as a reference, and the height of the boss 7 is within the tolerance range of 1mm plus or minus 0.5mm.

[0050] 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 magnetic aluminum pot with a large bottom area, characterized by: The invention comprises an aluminum pot body (1) and a magnetic conductive sheet group embedded in the bottom of the aluminum pot body (1), wherein the magnetic conductive sheet group comprises a plurality of magnetic conductive sheets (2) of the same structure located in the same horizontal plane and arranged in a surrounding manner, wherein the lower end surface of the magnetic conductive sheet (2) is arranged in parallel and spaced relation with the outer bottom surface of the aluminum pot body (1), a first positioning hole (3) is arranged on one side of the magnetic conductive sheet (2), a plurality of oblong holes (4) are arranged radially along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet (2), a plurality of waist-shaped holes (5) and a plurality of riveted through holes (6) are arranged circumferentially along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet (2) between adjacent oblong holes (4), a plurality of bosses (7) are arranged on the outer bottom of the aluminum pot body (1) corresponding to the oblong holes (4), the waist-shaped holes (5) and the riveted through holes (6), respectively, and the bosses (7) are riveted to the inner bottom of the aluminum pot body (1); The edges of the oblong hole (4) and the waist-shaped hole (5) are bent toward the inner bottom surface of the aluminum pot body (1) to form an annular hoop (8); The first positioning hole (3) is a rectangular hole; A second positioning hole (9) is provided at the edge of the magnetic conductive sheet (2) corresponding to the oblong hole (4); The second positioning hole (9) is a semicircular hole; The bottom large-area magnetic conductive aluminum pot is manufactured by the following method, including the following steps: Step 1: Prepare magnetic conductive sheet A whole piece of stainless steel plate is punched, wherein a first positioning hole (3) is provided on one side of the magnetic conductive sheet (2), the first positioning hole (3) is a rectangular hole, a plurality of oblong holes (4) are radially provided along the center of the magnetic conductive sheet group toward the edge of the magnetic conductive sheet (2), a plurality of waist-shaped holes (5) and a plurality of riveted through holes (6) are circumferentially provided along the center of the magnetic conductive sheet group 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 bent toward the inner bottom surface of the aluminum pot body (1) to form an annular hoop (8), the edge of the magnetic conductive sheet (2) is provided with a second positioning hole (9) corresponding to the oblong hole (4), the second positioning hole (9) is a semicircular hole; a plurality of blocks are punched according to product requirements; Step 2: Positioning and clamping the mold A plurality of magnetic conductive sheets (2) are placed in a mold in a surrounding manner and arranged in the same horizontal plane to form a magnetic conductive sheet group. The mold includes an upper mold, a lower mold, a magnetic conductive rod and a magnetic copper coil group. An insert is provided at the bottom of the upper mold. The insert is provided with a clearance hole that matches the shape of a boss (7) at the outer bottom of the aluminum pot body (1). An exhaust pin is provided on the clearance hole. The insert is the same shape as the magnetic conductive sheet group but slightly larger in size. Four magnetic conductive rods are embedded in the insert in the upper mold. Part of the four magnetic conductive rods are embedded in the insert and part of them are exposed outside the upper mold. , four magnetic bars exposed outside the upper mold are connected to the magnetic copper coil group in groups of two, and the insert is provided with positioning holes corresponding to the first positioning hole (3) and the second positioning hole (9) respectively; the above mold is installed on the casting machine, the upper mold and the lower mold are separated and shimmed, the inner cavity of the mold is heated to 210°C to 300°C, the magnetic sheet group is directly positioned on the positioning hole of the insert in the upper mold by a positioning fixture, and then the copper coil on the mold is energized to absorb the magnetic sheet group on the insert in the upper mold, the positioning fixture is removed, and then the upper and lower molds are precisely aligned; Step 3: Casting Molten aluminum liquid is injected, and the flowing aluminum liquid passes through the riveting through hole (6) to form a rivet, thereby forming the pot body and the magnetic conductive sheet assembly at one time; Step 4: Polishing First, excess aluminum residue is removed by sawing machine, and the rivets with uneven and irregular heights on the bottom of the pot are squeezed by hydraulic press to form a boss (7) at one time, and the height is consistent and regular. According to the product processing standards and relevant drawing dimensions, the programming is input into the CNC lathe, and the aluminum pot is placed on the lathe mold and processed inside and outside using a diamond knife to remove the rough shrinkage cavity surface produced by casting. When processing the outer bottom surface of the aluminum pot body (1), the lower end surface of the magnetic conductive sheet (2) is used as a reference, and the height of the boss (7) is within the tolerance range of 1mm±0.5mm.

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