A method for sealing and welding the opening of a galvanized iron box for packaging bullets

Abstract

A method for sealing and welding the opening of a galvanized iron box for bullet packaging belongs to the field of automation technology. It is based on a galvanized iron sheet, a baffle, and a high-temperature welding heating device. The galvanized iron sheet is provided with a quadrilateral groove, and the galvanized iron sheet is placed between the upper and lower heating copper blocks of the high-temperature welding heating device. First, the galvanized iron sheet is preheated, and solder paste is evenly applied to the groove of the galvanized iron sheet. Secondly, the baffle is placed on the groove, and the baffle completely covers the solder paste. Finally, the above structure is placed between the upper and lower heating copper blocks of the high-temperature welding heating device, and the solder wire is fed through the high-temperature welding heating device during the heating process. The present invention realizes complete sealing between the galvanized iron sheet and the baffle through solder paste, and realizes automatic positioning of the baffle on the groove of the galvanized iron sheet, that is, complete sealing of the opening of the galvanized iron box for bullet packaging is realized; the method for using solder paste is safe and fast, and can improve the production efficiency of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of automation and relates to a method for sealing and welding an opening of a galvanized iron box for bullet packaging. Background Art

[0002] At present, the welding production of packaging boxes has been largely automated, but the general welding process requires manual positioning of the welded parts, and it is rare to achieve autonomous positioning of the welded parts, which greatly reduces the welding efficiency. In addition, in the soldering process, the sealing condition is often achieved by the movement of the soldering iron. The tin coverage area of ​​the contact surface between the welding parts is not complete or due to the limitation of the movement range of the welding process, the welding will be unstable, reducing the efficiency of labor production and increasing the consumption of manpower and material resources. When it comes to the production process of tight sealing required for bullet packaging boxes, most manufacturers will choose manual operation without considering the advantages of the material itself, which increases the cost consumption.

[0003] During the soldering process of an ordinary soldering iron, the solder wire will move with the soldering iron. However, due to the limitations of manual operation during the welding process and the defects of the soldering iron heating, the solder may not be able to completely fill the part to be welded, making it impossible for the ordinary soldering iron to achieve complete sealing after welding in one circle. In addition, because the thickness of the iron sheet and the baffle is very small, the heat-affected zone of the argon arc welding technology is large, and the instantaneous heating temperature is high, the surface to be welded may be deformed, cracked, pinhole, worn, scratched or internally stressed. The overall thickness of the galvanized iron sheet is relatively thin, and it is difficult to weld metals such as lead, tin, and zinc. The galvanized iron sheet may also be damaged during the welding process.

[0004] Surface mount technology refers to printing and coating solder paste on the pads of printed circuit boards, accurately placing surface mount components on the pads coated with solder paste, heating the circuit board according to a specific reflow temperature curve, melting the solder paste, and forming solder joints between the components and the printed circuit board after its alloy components cool and solidify to achieve metallurgical connection. Solder paste is a new type of welding material that came into being with surface mount technology. Solder paste is a complex system, which is a paste mixed with solder powder, flux and other additives. Solder paste has a certain viscosity at room temperature, which can initially stick electronic components to a predetermined position. At the welding temperature, as the solvent and some additives evaporate, the components to be welded are welded to the printed circuit pads to form a permanent connection.

[0005] In addition to removing oxidized substances from the welding parts and preventing adhesion, solder paste can also be used to increase the fluidity of tin. Summary of the invention

[0006] In view of the problems existing in the sealing of inert iron sheets in the prior art, the present invention provides a method for sealing and welding the opening of a galvanized iron box for bullet packaging, which can realize automatic positioning of the baffle on the welding point of the steel plate; since the solder paste has great fluidity, the welding contact surface of the baffle and the steel plate can be completely covered during the welding process, which greatly improves the welding efficiency while ensuring complete sealing, and the entire welding process is automated, which greatly reduces the production cost.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for sealing and welding the opening of a galvanized iron box for ammunition packaging, the method is based on a galvanized iron sheet 1, a baffle 2, and a high-temperature welding heating device 4, the galvanized iron sheet 1 (processing object) and the baffle 2 are completed in cooperation, wherein a quadrilateral groove 3 is provided on the galvanized iron sheet 1, the high-temperature welding heating device 4 comprises a left curved pipe 4-1, a right curved pipe 4-2, an upper heating copper block 4-3, a lower heating copper block 4-4, and a soldering iron tip 4-5, the left curved pipe 4-1 is installed on the left side of the upper heating copper block 4-3, the right curved pipe 4-2 is installed on the right side of the upper heating copper block 4-3, the soldering iron tip 4-5 is installed in the middle of the lower surface of the upper heating copper block 4-3, and the galvanized iron sheet 1 is placed between the upper and lower heating copper blocks 4-3 and 4-4. The method comprises the following steps:

[0009] In the first step, the galvanized iron sheet 1 to be processed is preheated to facilitate subsequent material processing, and solder paste is evenly applied on the quadrilateral groove 3 of the galvanized iron sheet 1. The solder paste adopts SMT patch environmentally friendly lead-free high-temperature solder paste, and its composition is as follows: Sn content 99%, Ag 0.3%, Cu 0.7%.

[0010] In the second step, the baffle 2 is placed on the groove 3 of the galvanized iron sheet 1 . The baffle 2 can completely cover the solder paste, and the side length of the baffle 2 is slightly smaller than the groove 3 of the galvanized iron sheet 1 .

[0011] The third step is to place the above structure between the upper and lower heating copper blocks of the high-temperature welding heating device 4, and heat it at 350°C for 10 seconds. During the heating process, the solder wire is sent through the high-temperature welding heating device. Under the action of the solder paste: the tin flows completely on the contact surface of the galvanized iron sheet 1 and the baffle 2, that is, the contact surface of the galvanized iron sheet 1 and the baffle 2 is full of tin, which better fills the gap between the galvanized iron sheet 1 and the baffle 2 to achieve complete sealing; at the same time, by utilizing the fluidity of the solder paste during heating, the position of the baffle 2 is automatically adjusted to the center of the groove of the galvanized iron sheet 1, so that the baffle 2 is automatically positioned on the groove of the galvanized iron sheet 1.

[0012] The fourth step is to take out the above structure. After the galvanized iron sheet 1 is cooled to room temperature, the groove 3 of the galvanized iron sheet 1 and the baffle 2 can be completely sealed by the solder paste and solder wire.

[0013] Furthermore, the galvanized iron sheet 1 and the baffle 2 are both made of galvanized iron sheet.

[0014] The beneficial effects of the present invention are as follows: the present invention can achieve complete sealing of the opening of the galvanized iron box for bullet packaging; the method for using the solder paste is safe and quick, which can improve the production efficiency of the product, while liberating productivity and reducing the manufacturing cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of a galvanized iron sheet according to an embodiment of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure after the process of the present invention is completed;

[0018] Figure 4 It is a structural schematic diagram of a high temperature welding heating device;

[0019] In the figure: 1 galvanized iron sheet, 2 baffle, 3 groove; 4 high temperature welding heating device, 4-1 left curved pipe, 4-2 right curved pipe, 4-3 upper heating copper block, 4-4 lower heating copper block, 4-5 soldering iron tip. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0021] Figure 1 The overall structure diagram of the embodiment of the present invention includes 1 galvanized iron sheet, 2 baffles, and a high-temperature welding heating device 4. The baffle 2 is placed on the groove 3 of the galvanized iron sheet 1, and the galvanized iron sheet 1 is placed between two heating blocks of the high-temperature welding heating device 4.

[0022] Figure 2 It is a schematic diagram of a galvanized iron sheet according to an embodiment of the present invention, comprising a galvanized iron sheet 1 on which a quadrilateral groove 3 is provided.

[0023] Figure 3 It is a schematic diagram of the structure after the process of the present invention is completed, including a galvanized iron sheet 1 and a baffle 2. At this time, solder paste has been applied to the groove 3 of the galvanized iron sheet 1, and the baffle 2 is fixedly placed in the groove 3 of the galvanized iron sheet 1.

[0024] Figure 4It is a schematic diagram of the structure of a high-temperature welding heating device, including a left curved pipe 4-1, a right curved pipe 4-2, an upper heating copper block 4-3, a lower heating copper block 4-4, and a soldering iron tip 4-5. The left curved pipe 4-1 is installed on the left side of the upper heating copper block 4-3, the right curved pipe 4-2 is installed on the right side of the upper heating copper block 4-3, the soldering iron tip 4-5 is installed in the middle of the lower surface of the upper heating copper block 4-3, the upper heating copper block 4-3 is above the galvanized iron sheet 1, the lower heating copper block 4-4 is below the galvanized iron sheet 1, and the upper and lower heating copper blocks clamp the galvanized iron sheet 1 at the groove 3.

[0025] A method for sealing and welding an opening of a galvanized iron box for packaging bullets, comprising the following steps:

[0026] First, solder paste is automatically and evenly coated on the quadrilateral groove 3 of the galvanized iron sheet 1 .

[0027] Secondly, the device for carrying the baffle 2 places it on the groove 3 of the galvanized iron sheet 1 coated with solder paste, so that the baffle 2 can completely cover the solder paste coating area, and the side length of the baffle 2 is smaller than the groove 3 of the steel plate 1.

[0028] Finally, the high temperature welding heating device is used to heat the wire and feed it. The welding process:

[0029] The upper heating copper block 4-3 moves down, and the lower heating copper block 4-4 moves up, clamping the groove 3 of the galvanized iron sheet 1, and heating. It is heated at 350℃ for 10 seconds, and the baffle 2 is firmly adhered to the groove 3 of the galvanized iron sheet 1; the tin wire passes through the left elbow 4-1 and the right elbow 4-2 to the soldering iron head 4-5, and the high temperature causes the tin wire to change from solid to liquid, and flows into the gap between the galvanized iron sheet 1 and the baffle 2. The solder paste greatly increases the fluidity of the tin. Under the action of the solder paste, the tin flows completely on the contact surface of the galvanized iron sheet 1 and the baffle 2, that is, the contact surface of the galvanized iron sheet 1 and the baffle 2 is filled with tin, achieving complete sealing; at the same time, using the high fluidity of the solder paste (using the fluidity of the solder paste when heated), the position of the baffle 2 is automatically adjusted to the center of the groove of the galvanized iron sheet 1, so that the baffle 2 is automatically positioned on the groove of the galvanized iron sheet 1.

[0030] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for sealing and welding the opening of a galvanized iron box for bullet packaging, characterized in that: The method is implemented based on a galvanized iron sheet (1), a baffle (2), and a high-temperature welding heating device (4). The galvanized iron sheet (1) and the baffle (2) cooperate, wherein a quadrilateral groove (3) is provided on the galvanized iron sheet (1), and the high-temperature welding heating device (4) comprises a left curved pipe (4-1), a right curved pipe (4-2), an upper heating copper block (4-3), a lower heating copper block (4-4), and a soldering iron head (4-5). The left curved pipe (4-1) and the right curved pipe (4-2) are installed on the left and right sides of the upper heating copper block (4-3), the soldering iron head (4-5) is installed in the middle of the lower surface of the upper heating copper block (4-3), and the galvanized iron sheet (1) is placed between the upper heating copper block (4-3) and the lower heating copper block (4-4); the method comprises the following steps: The first step is to preheat the galvanized iron sheet (1) to be treated, and evenly apply solder paste on the quadrilateral groove (3) of the galvanized iron sheet (1), wherein the solder paste is a high-temperature solder paste; The second step is to place the baffle (2) on the groove (3) of the galvanized iron sheet (1), so that the baffle (2) can completely cover the solder paste; In the third step, the structure is placed between the upper and lower heating copper blocks of the high-temperature welding heating device (4) for heating. During the heating process, the solder wire is fed through the high-temperature welding heating device. Under the action of the solder paste, the contact surface between the galvanized iron sheet (1) and the baffle (2) is filled with tin, filling the gap between the galvanized iron sheet (1) and the baffle (2) to achieve complete sealing. At the same time, by utilizing the fluidity of the solder paste during heating, the position of the baffle (2) is automatically adjusted to the exact center of the groove of the galvanized iron sheet (1), thereby achieving automatic positioning of the baffle (2) on the groove of the galvanized iron sheet (1). Step 4: Take out the above structure, and after the galvanized iron sheet (1) is cooled to room temperature, the groove (3) of the galvanized iron sheet (1) and the baffle (2) can be completely sealed by solder paste and solder wire; The heating temperature in the third step is 350° C. and the heating time is 10 seconds.

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