A hot stamping forming device and a method for preparing a heating element

Abstract

The present invention discloses a hot stamping forming device, comprising the following components: a plurality of stamping parts (11), each of which has a stamping head (111); the stamping part (11) is connected to a power device; a base (12) is roughly disc-shaped, and a plurality of guide rails (121) are provided on the surface of the base (12), and the number of the guide rails (121) is the same as the number of the stamping parts (11); the stamping parts (11) are arranged on the guide rails (121), and the stamping heads (111) of each stamping part (11) are arranged relative to each other; the area surrounded by the plurality of stamping heads (111) in the middle of the surface of the base (12) is a stamping area (13) of a heating element (2). The present invention also discloses a method for preparing a heating element by the hot stamping forming device, and the use of the obtained heating element for heating a non-combustion cigarette heating element.

Description

Technical Field

[0001] The invention relates to the field of heat-not-burn smoking articles, and in particular to a hot stamping forming device and a method for preparing a heating element. Technical Background

[0002] Heat-not-burn smoking utensils are a new type of electronic smoking utensils. The heating element is the core component of heat-not-burn smoking utensils. The heating elements in the prior art have problems such as uneven heating, small heating area, and complex preparation process. Patent CN205491202U changes the heating sheet from a single-piece structure to a three-dimensional cross structure, and prints the heating circuit on the surface, which increases the heating area of ​​the heating element. However, the heating sheet of the three-dimensional cross structure is composed of two pieces that are assembled after being clipped. During use, tar-like substances are easy to adhere to the heating sheet, which will affect the electrical and thermal performance and service life of the heating sheet. In addition, there is a gap between the two pieces, which is difficult to clean. Patent CN209403578U embeds the heating sheet in a ceramic shell, solving the problem of easy adhesion of tar-like substances; however, due to the low thermal conductivity of the ceramic itself, the heating rate of the heating element is slow, and due to the large difference in thermal expansion coefficients between the ceramic shell and the embedded metal heating sheet, the ceramic shell and the embedded metal heating sheet are easy to separate, affecting the service life of the heating element.

[0003] The present invention has been proposed to solve the above-mentioned problems. Summary of the invention

[0004] In order to achieve the above-mentioned purpose, the present invention provides a hot stamping forming device and a method for preparing a heating element. The technical solution of the present invention is as follows:

[0005] The first aspect of the present invention discloses a hot stamping forming device, comprising the following components:

[0006] There are multiple stamping parts 11, each of which has a stamping head 111; the stamping parts 11 are connected to the power device;

[0007] The base 12 is roughly disc-shaped, and has a plurality of guide rails 121 on the surface of the base 12. The number of the guide rails 121 is the same as the number of the stamping parts 11.

[0008] The stamping parts 11 are arranged on the guide rails 121, and the stamping heads 111 of each stamping part 11 are arranged relatively to each other; the area surrounded by the plurality of stamping heads 111 in the middle of the surface of the base 12 is the stamping area 13 of the heating element 2;

[0009] Preferably, there are four stamping parts 11 and four guide rails 121 , and two adjacent guide rails 121 of the four guide rails 121 are arranged vertically; the stamping head 111 is pointed, and the tips of the plurality of stamping heads 111 are arranged opposite to each other.

[0010] Preferably, a fixing piece 131 for the heating element 2 is provided at the lower part of the stamping area 13 .

[0011] The second aspect of the present invention discloses a method for preparing a heating element by using the hot stamping forming device, wherein the heating element 2 comprises a shell 21, a heating sheet 22 arranged in the shell 21, and a temperature detection component 23; the shell 21 and the heating sheet 22 can be made of different metal materials as long as the thermal expansion coefficients of the two metals are close; preferably, the shell 21 and the heating sheet 22 are made of the same metal material;

[0012] The method for producing the heating element 2 using the hot stamping forming device comprises the following steps:

[0013] ① Place a certain length of heat-treated metal tube in the stamping area 13, and fix the bottom of the metal tube on the fixing member 131 so that the metal tube is placed vertically along the axial direction;

[0014] ② Start the power device to make the stamping part 11 move along the guide rail 121, and the stamping head 111 quickly stamps the heat-treated metal tube to stamp the metal tube into a shell blank;

[0015] ③ The shell blank of step ② is made into a pointed shell 21 by laser cutting and welding, and then an insulating layer is sprayed on the surface of the shell;

[0016] ④ After etching the heating sheet 22, laser welding is performed into the same shape as the housing 21, and an insulating layer is sprayed on the surface of the heating sheet;

[0017] ⑤ Laser weld two pins 24 at both ends of the bottom of the heating sheet 22, and then install the heating sheet 22 and the temperature detection component 23 into the metal shell to form a heating component; the temperature detection component 23 is preferably a K-type thermocouple;

[0018] ⑥ Install the heating component of step ⑤ on the ceramic base 25, and use ceramic glue to encapsulate and solidify it to obtain the heating element 2.

[0019] Preferably, there are four stamping parts 11 and four guide rails 121 , and two adjacent guide rails 121 of the four guide rails 121 are arranged vertically; and the radial section of the heating element 2 is a cross shape.

[0020] Preferably, the metal tube is made of stainless steel, the heat treatment temperature is 700-1100°C, and the heat treatment time is 0.5-12h. The heat treatment equipment is an automated crawler annealing furnace, which can transport the annealed blank metal tube to the stamping area 13 of the hot stamping forming device via crawlers.

[0021] Preferably, the base sheet of the heating plate 22 in step ④ is a metal sheet, and the etching steps of the metal sheet are as follows: coating the surface of the metal sheet with photosensitive resin, exposing the photosensitive resin to light, developing and vertical film processing, preparing an anti-corrosion layer on the surface of the metal sheet, and then placing the metal sheet in an anti-corrosion liquid to etch unnecessary parts to form a prefabricated pattern, taking out the metal sheet and cleaning the corrosive liquid on the surface with an alkaline solution, and cleaning the metal sheet with clean water to obtain a metal sheet with a resistance value of 0.1Ω-10Ω.

[0022] Preferably, the thickness of the metal sheet is 0.05-0.5mm; the component of the corrosive solution is ferric chloride solution, and the concentration of the corrosive solution is 100g / L-1000g / L; the etching temperature is 25℃-35℃, and the etching time is 1min-100min; the alkaline solution is at least one of lithium hydroxide, sodium hydroxide, calcium hydroxide, etc., the concentration of the alkaline solution is 5wt%-10wt%, the cleaning time is 1min-100min, and the cleaning temperature is 25℃-35℃.

[0023] Preferably, the components of the etching solution also include: one or more of hydrochloric acid, ammonium bifluoride, hydrofluoric acid, hydrogen peroxide, thiourea, and hypochlorous acid, and the concentration thereof is 0.1 g / L-10 g / L.

[0024] The third aspect of the present invention discloses a heating element prepared by the method and its use in heating a heating element of a non-combustion cigarette.

[0025] Beneficial effects of the present invention:

[0026] 1. The heating element of the present invention includes a shell and a heating sheet embedded in the shell. There is no possibility of tar-like substances sintering and adhering to the heating sheet, and the electric heating performance and service life of the heating element can be effectively guaranteed; the present invention adopts a three-dimensional cross-structure design to form a heating element with a radial cross-shaped section, which has a reliable structure and a low damage rate; the contact area between the tobacco filler of the heat-not-burn cigarette and the heating element is increased, which is more than 50% higher than the existing technology such as CN209403578U ceramic sheet. The increase in heating area makes the tobacco filler of the heat-not-burn cigarette more evenly heated and has a higher utilization rate; the heat energy is released in a symmetrical distribution, the heating speed can be effectively improved, and the preheating time is 5-7s less than the existing technology such as CN209403578U ceramic sheet, which is highly efficient and energy-saving. In addition, the gap formed around the heating element can be more conducive to the extraction of smoke, which can effectively prevent the cigarette from being burnt and enable users to obtain a better smoking experience.

[0027] 2. The shell and the heating plate of the heating element of the present invention are made of metals with similar thermal expansion coefficients, preferably made of the same metal material, so that the shell and the heating plate can fit tightly together, and there is no problem of thermal expansion stress causing the heating element to separate from the shell, thereby improving the service life of the heating element.

[0028] 3. The heating element of the present invention is used in smoking utensils for heating non-combustible cigarettes, and has not yet been put on the market in batches. In order to realize the automated production of the above-mentioned cross-shaped heating element, the hot stamping forming technology based on the hot stamping forming device proposed in the present invention realizes the method of automated production of the above-mentioned cross-shaped heating element. The preparation method of the present invention has simple steps, a high degree of automation, a low scrap rate, and high production efficiency. It solves the problems of the existing wide-width heating elements (i.e., the heating elements have a large contact area), the difficult production process, the complex production process, and the long production cycle, and is very suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The invention relates to a hot stamping forming device.

[0030] Figure 2 The radial cross section of the heating element is a cross shape.

[0031] Figure 3 The invention discloses a heating sheet for the heating element.

[0032] The figures are marked as follows: 11, stamping part; 111, stamping head; 12, base; 121, guide rail; 13, stamping area; 131, fixing part; 2, heating element; 21, shell; 22, heating sheet; 23, temperature detection component; 24, pin; 25, ceramic base. DETAILED DESCRIPTION

[0033] The following is a detailed, complete and unambiguous description of the concept, specific structure and technical effects of the present invention in combination with the embodiments and the accompanying drawings, so as to fully understand the purpose, scheme, effect and innovation of the present invention. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other, and the features involved in the embodiments are not the entire content of the present invention. In addition, in order to prevent ambiguity in the description, the descriptions of up, down, left, right, etc. used in the present invention are only described relative to the relative positional relationship of the components of the present invention in the figure.

[0034] The hot stamping forming device used in the present invention is as follows Figure 1As shown, it includes the following components: a plurality of stamping parts 11, each of which has a stamping head 111; the stamping part 11 is connected to the power device; the base 12 is roughly disc-shaped, and a plurality of guide rails 121 are arranged on the surface of the base 12, and the number of the guide rails 121 is the same as the number of the stamping parts 11; the stamping parts 11 are arranged on the guide rails 121, and the stamping heads 111 of each stamping part 11 are arranged relatively; the area surrounded by the plurality of stamping heads 111 in the middle of the surface of the base 12 is the stamping area 13 of the heating element 2; the stamping parts 11 and the guide rails 121 of this embodiment are four respectively, and the adjacent two guide rails 121 of the four guide rails 121 are arranged vertically; the stamping head 111 is pointed, and the tips of the plurality of stamping heads 111 are arranged relatively. The lower part of the stamping area 13 has a fixing part 131 of the heating element 2.

[0035] The heating element 2 prepared by the hot stamping forming device is as follows Figure 2 The heating element 2 comprises a housing 21, a heating sheet 22 arranged in the housing 21, and a temperature detection component 23; the housing 21 and the heating sheet 22 are made of the same metal material.

[0036] The method for producing the heating element 2 using the hot stamping forming device comprises the following steps:

[0037] Place the 304 stainless steel tube in an annealing furnace and anneal at 1050°C for 2 hours. After annealing, the blank is transported to the stamping area 13 via a crawler. Four stamping heads 111 extrude the blank to form a cross-shaped extrusion under the action of the motor, and the holding time is 0.5s. After hot stamping, the blank is pushed into the laser cutting and welding mold. Under the control of the program, the laser cutting machine cuts off one end of the stamping shell to form a sharp corner. After cutting, the four cutting gaps formed are welded by laser cutting. The four cuttings are welded in sequence to complete the welding of the cross-shaped metal shell with a radial section. The welded cross-shaped shell is uniformly sprayed with glaze to serve as an insulating layer.

[0038] The 304 stainless steel sheet is first cleaned, degreased and other surface treatments are performed, and then the surface is coated with photosensitive adhesive, and then the photosensitive adhesive is exposed according to the processing pattern, and then developed and vertical film processed. After the treatment is completed, the sample is immersed in a stainless steel corrosive solution for etching. The components of the corrosive solution used are a 500g / L ferric chloride solution, a regulator of 6g / L hydrochloric acid, 3g / L hydrogen peroxide, 6g / L hypochlorous acid, 3g / L thiourea, and 1.8g / L ammonium bifluoride. The temperature of the etching reaction is 25°C, and the etching time is 5min. After the etched sample is taken out, the residual etching solution is removed with an alkaline solution, and the metal heating sheet with a resistance of 0.7Ω and a thickness of 0.4mm is obtained by washing with clean water. Figure 3As shown. The obtained metal heating plate is laser welded into a cross shape so that the metal heating plate can be installed in the above-mentioned metal shell with a cross-shaped radial section; two pins 24 are laser welded at both ends of the metal heating plate for connecting to the external circuit, and the heating plate with the welded pins is sprayed with glaze for insulation treatment. The welded cross-shaped heating plate is installed in the heating body shell. The K-type thermocouple is installed in the metal shell, and then the metal shell is sleeved on the ceramic base 25, and ceramic glue is injected on the ceramic base 25. The air inside the metal shell is evacuated, and the ceramic glue completely fills the metal shell and is placed in a drying oven for drying and curing. The drying temperature is 150°C and the drying time is 5h to complete the curing of the ceramic glue. The above steps to complete the cross-shaped heating element are semi-automatic production, which can greatly improve the production efficiency and production quality of the heating element. The obtained heating element is used in heat-not-burn cigarettes. Compared with the existing technology, its electrothermal performance and service life are significantly improved, and the user's smoking experience can be significantly improved.

[0039] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A method for preparing a heating element using a hot stamping forming device, characterized in that: The hot stamping forming device comprises the following components: There are multiple stamping parts (11), each of which has a stamping head (111); the stamping parts (11) are connected to the power device; The base (12) is roughly disc-shaped, and a plurality of guide rails (121) are provided on the surface of the base (12), and the number of the guide rails (121) is the same as the number of the stamping parts (11); The stamping parts (11) are arranged on the guide rail (121), and the stamping heads (111) of each stamping part (11) are arranged relative to each other; the area surrounded by the plurality of stamping heads (111) in the middle of the surface of the base (12) is the stamping area (13) of the heating element (2); A fixing part (131) for the heating element (2) is provided at the lower part of the stamping area (13); The heating element (2) comprises a housing (21), a heating sheet (22) arranged in the housing (21), and a temperature detection component (23); the heating element (2) is a heating element used for heating non-combustion cigarettes; a method for producing the heating element (2) using a hot stamping forming device comprises the following steps: ① Placing a certain length of heat-treated metal tube in the stamping area (13), and fixing the bottom of the metal tube on a fixing member (131) so that the metal tube is placed vertically along the axial direction; ② Starting the power device to move the stamping part (11) along the guide rail (121), and the stamping head (111) quickly stamps the heat-treated metal tube to stamp the metal tube into a shell blank of a cross-shaped extruded part; ③ The shell blank of step ② is laser cut and welded to form a pointed shell (21), and then a layer of insulating layer is sprayed on the surface of the shell; the specific steps are: laser cutting one end of the shell blank of step ② to form a sharp corner; using laser welding to complete the welding of the metal shell with a cross-shaped radial section; spraying and glazing the welded cross-shaped shell uniformly to serve as an insulating layer; thus, the metal shell is obtained; ④ After etching, the heating sheet (22) is laser welded into the same shape as the shell (21), i.e., a cross shape, and an insulating layer is sprayed on the surface of the heating sheet; ⑤ Laser weld two pins (24) at both ends of the bottom of the heating sheet (22), and then install the heating sheet (22) and the temperature detection component (23) into a metal shell to form a heating component; the bottom of the heating sheet (22) is the opposite end of the tip of the heating sheet (22); the specific steps are: laser weld two pins (24) at both ends of the bottom of the cross-shaped heating sheet (22) obtained in step ④; then install the heating sheet (22) into the metal shell obtained in step ③; install a K-type thermocouple into the metal shell to obtain the heating component; ⑥ Install the heating component of step ⑤ on the ceramic base (25) and use ceramic glue to encapsulate and solidify it, so as to obtain the heating element (2); the ceramic base (25) is at the opposite end of the tip of the heating component; the specific steps are: put the heating component obtained in step ⑤ on the ceramic base (25), inject ceramic glue on the ceramic base (25), evacuate the air inside the metal shell, and after the ceramic glue completely fills the metal shell, put it in a drying oven for drying and solidification, and complete the solidification of the ceramic glue; the heating element (2) is obtained.

2. The method according to claim 1, characterized in that There are four stamping parts (11) and four guide rails (121), and two adjacent guide rails (121) of the four guide rails (121) are arranged vertically; the radial section of the heating element (2) is in a cross shape.

3. The method according to claim 1, characterized in that The metal tube is made of stainless steel, the heat treatment temperature is 700-1100° C., and the heat treatment time is 0.5-12 hours.

4. The method according to claim 1, characterized in that: The base sheet of the heating sheet (22) in step ④ is a metal sheet, and the etching steps of the metal sheet are as follows: coating the surface of the metal sheet with photosensitive resin, exposing the photosensitive resin to light, developing and vertical film processing, preparing an anti-corrosion layer on the surface of the metal sheet, and then placing the metal sheet in an anti-corrosion liquid to etch unnecessary parts to form a prefabricated pattern, taking out the metal sheet and cleaning the surface of the corrosive liquid with an alkaline solution, and cleaning the metal sheet with clean water to obtain a metal sheet with a resistance value of 0.1Ω-10Ω.

5. The method according to claim 4, characterized in that The thickness of the metal sheet is 0.05-0.5mm; the component of the corrosive solution is ferric chloride solution, and the concentration of the corrosive solution is 100g / L-1000g / L; the etching temperature is 25℃-35℃, and the etching time is 1min-100min; the alkaline solution is at least one of lithium hydroxide, sodium hydroxide, and calcium hydroxide, and the concentration of the alkaline solution is 5wt%-10wt%, the cleaning time is 1min-100min, and the cleaning temperature is 25℃-35℃.

6. The method according to claim 5, characterized in that The components of the etching solution also include: one or more of hydrochloric acid, ammonium bifluoride, hydrofluoric acid, hydrogen peroxide, thiourea, and hypochlorous acid, and the concentration thereof is 0.1 g / L-10 g / L.

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