A manufacturing method of a composite coffee pot body

Abstract

A manufacturing method of a composite coffee pot body, comprising: Step 1): Take a fixed-length tubular material of the first material and neck down its head; Step 2): Take a fixed-length tubular material of the second material and neck down its head; Step 3): Sheath the tubular material of the second material on the tubular material of the first material; Step 4): Spin the tubular material of the second material sheathed on the tubular material of the first material to form a composite pipe fitting; Step 5): Obtain a composite coffee pot body blank by hot extrusion of the composite pipe fitting; Step 6): Spin the lower end of the composite coffee pot body blank inward to form an annular bottom wall and a bottom opening; Step 7): Rivet and circumferentially weld the composite bottom composed of the first material layer and the second material layer to the bottom of the composite coffee pot body blank to obtain a composite coffee pot body blank; Step 8): Post-treat the composite coffee pot body blank. This method can achieve the advantages of low manufacturing cost, high yield, good quality, high appearance value, and diverse shapes of the coffee pot body.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing household hardware metal products, and particularly to a manufacturing method for a composite coffee pot body. Background Art

[0002] A household coffee pot is a cooking utensil with an independent heating system, mainly used for preparing coffee extracts under steam pressure, and is an indispensable household product in people's daily lives.

[0003] Currently, the manufacturing of coffee pot bodies mainly adopts methods such as aluminum die-casting forming, aluminum casting forming, and stretching forming of aluminum alloy or stainless steel plates. Each method has its advantages and disadvantages: The die-casting mold for the coffee pot body formed by aluminum die-casting has a large investment and a high rejection rate. Its advantage is that the pot body can be made into an octahedron or polyhedron shape, with a strong three-dimensional sense and high appearance value; Although the equipment investment for the coffee pot body formed by aluminum casting is less, the castings have poor metal density, many surface pores, rough surfaces, and low product appearance value; The coffee pot body formed by stretching aluminum alloy or stainless steel has a single shape, generally a conical or frustum-shaped rotating body shape, with a low product grade. Limited by the shape characteristics of a small bottom and a large mouth, it is difficult to make an octahedron or polyhedron shape, so the product grade is low and it is difficult to meet people's aesthetic requirements for a better life. Summary of the Invention

[0004] In order to solve the above problems such as high-cost die-casting molds, high-rejection-rate production methods, poor-quality casting methods, and single-shaped stretching forming methods, the present invention provides a manufacturing method for a composite coffee pot body. Through this method, the present invention can achieve the advantages of low manufacturing cost, high yield, good quality, high appearance value, and diverse shapes of the coffee pot body.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A manufacturing method for a composite coffee pot body, comprising the following process steps:

[0007] Step 1): Take a fixed-length tube material of the first material and neck down its head;

[0008] Step 2): Take a fixed-length tube material of the second material and neck down its head;

[0009] Step 3): Slip the necked-down second-material tube over the necked-down first-material tube, and ensure that their shoulders are in contact and their necked-down parts are in corresponding positions;

[0010] Step 4): Use a rotary necking machine to spin the second material tube blank sleeved on the first material tube blank, so as to eliminate the gap between the second material tube blank and the first material tube blank, and make the inner peripheral surface of the second material tube blank fit closely with the outer peripheral surface of the first material tube blank, thereby forming a composite pipe fitting with a necked head, with the first material on the inner layer and the second material on the outer layer;

[0011] Step 5): Put the composite pipe fitting obtained in Step 4) into a heating furnace and heat it to the required temperature, then take it out and put it into an extrusion die with the necked end facing downwards. Then, under the pressure of an extruder, extrude the composite pipe fitting into a composite coffee pot body blank with a small head and a large bottom, with the first material on the inner layer and the second material on the outer layer;

[0012] Step 6): Use a rotary necking machine to spin the lower end of the composite coffee pot body blank obtained in Step 5) inwards, thereby forming an annular bottom wall at the bottom of the composite coffee pot body blank and a bottom opening defined by the inner circumference of the annular bottom wall;

[0013] Step 7): Take a composite bottom composed of a first material layer and a second material layer located outside the first material layer, and connect it to the annular bottom wall of the composite coffee pot body blank obtained in Step 6) to seal the bottom opening, thereby obtaining a composite coffee pot body blank;

[0014] Step 8): Subject the composite coffee pot body blank obtained in Step 7) to post-treatment to obtain a finished composite coffee pot body.

[0015] Further, in Step 7): When the composite bottom is connected to the annular bottom wall of the composite coffee pot body blank, the first material layer is connected to the first material part of the annular bottom wall, and the second material layer is connected to the second material part of the annular bottom wall.

[0016] Further, in Step 7), the connection between the composite bottom and the annular bottom wall of the composite coffee pot body blank includes: A. Use a rotary necking machine to spin the inner lower end surface of the annular bottom wall of the composite coffee pot body blank, so that the spun part concaves upwards to form a first annular groove part; B. Machine a second annular groove part on the inner upper end surface of the annular bottom wall of the composite coffee pot body blank; C. Turn the first material layer of the composite bottom along the circumference to a diameter slightly smaller than the bottom opening diameter of the composite coffee pot body blank; D. Press the composite bottom into the bottom of the composite coffee pot body blank, so that the upper part of the first material layer of the composite bottom passes through the bottom opening, and the second material layer is embedded in the first annular groove part. Then, use an extrusion device to extend into the extrusion die from the upper opening of the composite coffee pot body blank to extrude the upper part of the first material layer of the composite bottom, so that the upper part of the first material layer deforms and is riveted to the second annular groove part. At the same time, weld the second material layer of the composite bottom to the first annular groove part by circumferential seam welding.

[0017] Furthermore, the diameter of the second annular groove portion is smaller than the upper mouth diameter of the composite coffee pot body blank.

[0018] Furthermore, the first material is any one of aluminum, aluminum alloy, magnesium, and magnesium alloy, and the second material is any one of magnetic stainless steel, copper, copper alloy, titanium, and titanium alloy.

[0019] Furthermore, the length of the necked part at the head of the second material pipe blank is shorter than the length of the necked part at the head of the first material pipe blank.

[0020] Furthermore, in step 4), a neck is also spun on the necked part at the head of the composite pipe fitting.

[0021] Furthermore, in step 5), the required temperature is 400 to 550 °C.

[0022] Furthermore, in step 6), the bottom mouth diameter of the composite coffee pot body blank is smaller than the upper mouth diameter.

[0023] Furthermore, in step 8), the post-treatment includes: A. Turning an external thread and an internal mouth positioning step on the upper mouth part of the composite coffee pot body blank; B. Sand polishing the surface of the composite coffee pot body blank.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] First of all, the manufacturing method of the composite coffee pot body of the present invention can overcome the disadvantages and limitations of the traditional manufacturing method, such as the high mold cost and high scrap rate of the die-cast coffee pot body, the many surface pores and poor quality of the cast coffee pot body, and the single shape of the drawn coffee pot body, etc., thereby improving the quality and consistency of the coffee pot body, and at the same time reducing the manufacturing cost and improving the production efficiency.

[0026] Secondly, the coffee pot body manufactured by the method of the present invention also has the advantages of high strength, corrosion resistance, good heat conduction performance, etc., the outer surface is mirror-finished and beautiful, not easy to deform, easy to clean, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of step 1) in the present invention.

[0028] Figure 2 is a schematic structural diagram of step 2) in the present invention.

[0029] Figure 3 is a schematic structural diagram of step 3) in the present invention.

[0030] Figure 4 is Figure 3 a partial enlarged schematic diagram of A in

[0031] Figure 5 It is a schematic structural view of the composite pipe fitting obtained in step 4) of the present invention.

[0032] Figure 6 It is a schematic structural view of the composite coffee pot body blank obtained in step 5) of the present invention.

[0033] Figure 7 It is a schematic structural view of the composite coffee pot body blank obtained in step 6) of the present invention.

[0034] Figure 8 It is a schematic structural view of the composite coffee pot body blank with a first annular groove portion spun and a second annular groove portion machined in the present invention.

[0035] Figure 9 is Figure 8 A partial enlarged view of B in

[0036] Figure 10 It is the composite bottom in the present invention and Figure 8 The connection decomposition schematic of the composite coffee pot body blank shown in Figure 1 .

[0037] Figure 11 It is the composite bottom in the present invention and Figure 8 The connection decomposition schematic of the composite coffee pot body blank shown in Figure 2 .

[0038] Figure 12 is Figure 11 A partial enlarged view of C in

[0039] Figure 13 It is the composite bottom in the present invention and Figure 8 The connection decomposition schematic of the composite coffee pot body blank shown in Figure 3 .

[0040] Figure 14 is Figure 13 A partial enlarged view of D in

[0041] Figure 15 It is a schematic structural view of the composite coffee pot body finished product in the present invention. Detailed implementation manners

[0042] The present invention will be further described in detail below with reference to the embodiments given in the drawings.

[0043] As Figures 1 to 15 shown, a manufacturing method of a composite coffee pot body provided by the present invention includes the following process steps:

[0044] Step 1): Take a fixed-length pipe material of the first material, and reduce the diameter of its head through a rotary necking machine;

[0045] Step 2): Take a fixed-length tubular blank of the second material, and neck down its head through a rotary compression necking machine.

[0046] Step 3): Sheath the tubular blank 2 of the second material with its head necked down over the tubular blank 1 of the first material with its head necked down, and ensure that the shoulders 21 and 11 of the two fit together and the necked-down parts 22 and 12 of the two are in corresponding positions.

[0047] Step 4): Use a rotary compression necking machine to spin the tubular blank 2 of the second material sheathed over the tubular blank 1 of the first material, so as to eliminate the gap between the tubular blank 2 of the second material and the tubular blank 1 of the first material, and make the inner peripheral surface of the tubular blank 2 of the second material fit tightly against the outer peripheral surface of the tubular blank 1 of the first material, thereby forming a composite pipe fitting 3 with a necked-down head, where the inner layer 31 is of the first material and the outer layer 32 is of the second material.

[0048] Step 5): Put the composite pipe fitting 3 obtained in Step 4) into a heating furnace and heat it to the required temperature, then take it out and put it into an extrusion die with the necked-down end facing downwards, and then extrude the composite pipe fitting 3 under the pressure of an extruder to form a composite coffee pot body blank 4 with a small head and a large bottom, where the inner layer 41 is of the first material and the outer layer 42 is of the second material. Moreover, during the extrusion forming process, due to the combined action of temperature and pressure, the inner layer 41 and the outer layer 42 of the formed composite coffee pot body blank 4 are metallurgically bonded together, thereby improving the connection strength between the inner layer and the outer layer. At the same time, the shape of the formed composite coffee pot body blank 4 is determined by the shape of the extrusion die. Therefore, if composite coffee pot body blanks of different shapes are to be obtained, only the corresponding shaped extrusion die needs to be replaced. For example, when the extrusion die is a regular polygon, the formed composite coffee pot body blank is also a regular polygon.

[0049] Step 6): Use a rotary compression necking machine to spin the lower end of the composite coffee pot body blank 4 obtained in Step 5) inwards, thereby forming an annular bottom wall 43 and a bottom opening 44 defined by the inner circumference of the annular bottom wall 43 at the bottom of the composite coffee pot body blank 4.

[0050] Step 7): Take a composite bottom 5 composed of a first material layer 51 and a second material layer 52 located outside the first material layer 51, and connect it to the annular bottom wall 43 of the composite coffee pot body blank 4 obtained in Step 6) to seal the bottom opening 44, thereby obtaining a composite coffee pot body blank 6.

[0051] Step 8): Subject the composite coffee pot body blank 6 obtained in Step 7) to post-treatment to obtain a finished composite coffee pot body 7.

[0052] As described above, in step 6), since the annular bottom wall 43 is integrally formed by inward spinning of the lower end portion of the composite coffee pot body blank 4, the annular bottom wall 43 is also a composite structure composed of an inner layer 431 and an outer layer 432, and the inner layer 431 is made of the first material and the outer layer 432 is made of the second material.

[0053] In a preferred example of the present invention, in step 7): when the composite bottom 5 is connected to the annular bottom wall 43 of the composite coffee pot body blank 4, the first material layer 51 is connected to the first material part (i.e., the inner layer 431) in the annular bottom wall 43, and the second material layer 52 is connected to the second material part (i.e., the outer layer 432) in the annular bottom wall 43. In this way, corresponding connection with the same material can improve the firmness and convenience of the connection.

[0054] In a preferred example of the present invention, in step 7), the connection between the composite bottom 5 and the annular bottom wall 43 of the composite coffee pot body blank 4 includes: A. Using a spinning and necking machine to spin the inner lower end surface of the annular bottom wall 43 of the composite coffee pot body blank 4, so that the spun part is recessed upward to form a first annular groove part 433. That is to say, the first annular groove part 433 is formed on the second material part (i.e., the outer layer 432) of the annular bottom wall 43; B. Processing a second annular groove part 434 on the inner upper end surface of the annular bottom wall of the composite coffee pot body blank 4. That is, the second annular groove part 434 is formed on the first material part (i.e., the inner layer 431) of the annular bottom wall 43; C. Turning the first material layer 51 of the composite bottom 5 along the circumference to a diameter slightly smaller than the diameter of the bottom opening 44 of the composite coffee pot body blank 4; D. Pressing the composite bottom 5 into the bottom of the composite coffee pot body blank 4, so that the upper end part of the first material layer 51 of the composite bottom 5 passes through the bottom opening 44, and the second material layer 52 is embedded in the first annular groove part 433. Then, using an extrusion device to extend from the upper opening 40 of the composite coffee pot body blank 4 into the extrusion die to extrude the upper end part of the first material layer 51 of the composite bottom 5, so that the upper end part of the first material layer 51 is deformed and riveted to the second annular groove part 434. Specifically, when the upper end part of the first material layer 51 is subjected to an extrusion force, its circumferential side will protrude outward into the second annular groove part 434 to be riveted thereto. At the same time, the second material layer 52 of the composite bottom 5 is welded to the first annular groove part 433 by a circumferential seam. This connection method can improve the connection firmness and airtightness between the composite bottom 5 and the annular bottom wall 43 of the composite coffee pot body blank 4. In this way, during the use of the coffee pot, on the one hand, it can prevent the steam in the pot body from overflowing from the connection between the composite bottom 5 and the annular bottom wall 43, and on the other hand, it can also prevent the steam pressure in the pot body from acting on the connection between the composite bottom 5 and the annular bottom wall 43 for a long time, resulting in the detachment of this connection.

[0055] In a preferred embodiment of the present invention, the diameter of the second annular groove portion 434 is smaller than the diameter of the upper mouth 40 of the composite coffee pot body blank 4, so that the diameter of the extrusion die extending into the upper mouth 40 of the composite coffee pot body blank 4 can be smaller than the diameter of the upper mouth, which facilitates the insertion and withdrawal of the extrusion die.

[0056] In a preferred embodiment of the present invention, the first material is aluminum alloy material, and the second material is magnetically conductive stainless steel material. That is to say, the inner layer of the formed composite coffee pot body is made of aluminum alloy material, and the outer layer is made of magnetically conductive stainless steel material, so that the coffee pot is suitable for use on an induction cooker and has good heat conduction performance of the pot body.

[0057] In other alternative embodiments of the present invention, the first material may also be any one of aluminum, magnesium, and magnesium alloy materials, and the second material may also be any one of copper, copper alloy, titanium, and titanium alloy materials.

[0058] In a preferred embodiment of the present invention, the length of the necked-down portion 22 of the head of the second material pipe 2 is shorter than the length of the necked-down portion 12 of the head of the first material pipe 1, so that the upper part of the mouth of the formed composite coffee pot body is a single material layer structure, that is, the first material layer structure, which is convenient for subsequent turning of an external thread on this part.

[0059] In a preferred embodiment of the present invention, in step 4), a neck 34 is also formed by spinning on the necked-down portion 33 of the head of the composite pipe fitting 3.

[0060] In a preferred embodiment of the present invention, in step 5), the required temperature is 400 to 550 °C.

[0061] In a preferred embodiment of the present invention, in step 6), the diameter of the bottom mouth 44 of the composite coffee pot body blank 4 is smaller than the diameter of the upper mouth 40. Such a design can, on the one hand, ensure that the diameter of the extrusion die extending into the upper mouth 40 of the composite coffee pot body blank 4 is smaller than the diameter of the upper mouth, and on the other hand, ensure that the annular bottom wall 43 has sufficient radial width.

[0062] In a preferred embodiment of the present invention, in step 8), the post-treatment includes: A. Turning an external thread 71 and an internal mouth positioning step 72 on the upper mouth part of the composite coffee pot body blank 6; B. Sand polishing the surface of the composite coffee pot body blank 6.

[0063] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention description still fall within the scope covered by the patent of the present invention.

Claims

1. A manufacturing method of a composite coffee pot body, characterized in that, it includes the following technological steps: Step 1): Take a fixed-length tubular material of the first material and neck down its head; Step 2): Take a fixed-length tubular material of the second material and neck down its head; Step 3): Slip the tubular material of the second material with its head necked down over the tubular material of the first material with its head necked down, and ensure that their shoulders are in contact and their necked-down parts are in corresponding positions; Step 4): Use a rotary necking machine to spin the tubular material of the second material sleeved on the tubular material of the first material, so as to eliminate the gap between the tubular material of the second material and the tubular material of the first material, and make the inner circumferential surface of the tubular material of the second material closely contact with the outer circumferential surface of the tubular material of the first material, thereby forming a composite pipe fitting with a necked-down head, with the first material on the inner layer and the second material on the outer layer; Step 5): Put the composite pipe fitting obtained in Step 4) into a heating furnace and heat it to the required temperature, then take it out and put it into an extrusion die with the necked-down end facing downwards, and then extrude the composite pipe fitting under the pressure of an extruder to form a composite coffee pot body blank with a small head and a large bottom, with the first material on the inner layer and the second material on the outer layer; Step 6): Use a rotary necking machine to spin the lower end of the composite coffee pot body blank obtained in Step 5) inwards, thereby forming an annular bottom wall and a bottom opening defined by the inner circumference of the annular bottom wall at the bottom of the composite coffee pot body blank; Step 7): Take a composite bottom composed of a first material layer and a second material layer located outside the first material layer, and connect it to the annular bottom wall of the composite coffee pot body blank obtained in Step 6) to seal the bottom opening, thereby obtaining a composite coffee pot body blank; Step 8): Subject the composite coffee pot body blank obtained in Step 7) to post-treatment to obtain a finished composite coffee pot body.

2. The manufacturing method of a composite coffee pot body according to claim 1, characterized in that, in Step 7): When the composite bottom is connected to the annular bottom wall of the composite coffee pot body blank, the first material layer is connected to the first material part in the annular bottom wall, and the second material layer is connected to the second material part in the annular bottom wall.

3. The manufacturing method of a composite coffee pot body according to claim 1 or 2, characterized in that, In step 7), the connection between the composite bottom and the annular bottom wall of the composite coffee pot body blank includes: A. Using a spinning and necking machine to spin the inner lower end surface of the annular bottom wall of the composite coffee pot body blank, so that the spun part is recessed upward to form a first annular groove part; B. Processing a second annular groove part on the inner upper end surface of the annular bottom wall of the composite coffee pot body blank; C. Turning the first material layer of the composite bottom along the circumference to a diameter slightly smaller than the bottom opening diameter of the composite coffee pot body blank; D. Pressing the composite bottom into the bottom of the composite coffee pot body blank, so that the upper part of the first material layer of the composite bottom passes through the bottom opening, and the second material layer is embedded in the first annular groove part. Then, using an extrusion device to extend from the upper opening of the composite coffee pot body blank into the extrusion die to extrude the upper part of the first material layer of the composite bottom, so that the upper part of the first material layer is deformed and riveted together with the second annular groove part. At the same time, the second material layer of the composite bottom is welded to the first annular groove part by circumferential seam welding.

4. The manufacturing method of a composite coffee pot body according to claim 3, wherein: the diameter of the second annular groove part is smaller than the upper opening diameter of the composite coffee pot body blank.

5. The manufacturing method of a composite coffee pot body according to claim 1, wherein: the first material is any one of aluminum, aluminum alloy, magnesium, and magnesium alloy materials, and the second material is any one of ferromagnetic stainless steel, copper, copper alloy, titanium, and titanium alloy materials.

6. The manufacturing method of a composite coffee pot body according to claim 1, wherein: the length of the necked part of the head of the second material tube blank is shorter than the length of the necked part of the head of the first material tube blank.

7. The manufacturing method of a composite coffee pot body according to claim 1 or 6, wherein: in step 4), it further includes spinning a neck on the necked part of the head of the composite pipe fitting.

8. The manufacturing method of a composite coffee pot body according to claim 1, wherein: in step 5), the required temperature is 400 to 550 °C.

9. The manufacturing method of a composite coffee pot body according to claim 1, wherein: in step 6), the bottom opening diameter of the composite coffee pot body blank is smaller than the upper opening diameter.

10. The manufacturing method of a composite coffee pot body according to claim 1, wherein: in step 8), the post-treatment includes: A. Turning an external thread and an internal mouth positioning step on the upper mouth part of the composite coffee pot body blank; B. Performing sand polishing treatment on the surface of the composite coffee pot body blank.

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