Design and manufacturing of metal box container structure

1. Classification method of metal box container: A. According to the shape of the container, it can be divided into round metal box, square metal box, oval metal box, oblate metal box, trapezoidal metal box, irregular metal box, etc.

2. Basic manufacturing process of metal box container: cold stamping process, welding process and bonding process

3. The bending process of sheet metal is divided into elastic bending stage and plastic bending stage. A. Elastic bending stage: In the elastic bending stage, the amount of deformation is the smallest, and the stress is only generated in the tangent direction of the bending arc. The sheet material close to the inner side in contact with the punch is compressed and deformed, and the stress state is unidirectional compression. The stress state close to the outside in contact with the die is unidirectional tension.

B. Plastic bending stage of the metal box: With the increase of the applied bending moment, the bending deformation of the sheet increases, and the inner and outer surface metal reaches the yield limit first, and the sheet begins to turn from the elastic deformation stage to the plastic deformation stage. With the continuous increase of the bending moment, the plastic deformation expands from the surface to the inside, and finally the entire section enters a plastic state. Plastic bending can be divided into three categories: a. Elastic-plastic bending b. Linear pure plastic bending c. Three-dimensional pure plastic bending.

4. Metal box drawing process: the flat blank is made into an open cylindrical or other cross-sectional shape part through a drawing die, or a cylindrical or

The blanks at the beginning of other sections are then made into cylindrical or other section-shaped parts.

5. The metal box necking process is a forming process in which the pre-drawn cylindrical or pipe blank is passed through a necking die to reduce the diameter of its mouth.

6. The bulging process of the metal box is to expand the hollow part or the tubular blank through the mold to expand the required convex surface.

7. The flanging process of the metal box is to turn the edge or outer edge of the hole of the workpiece into an upright or straight edge at a certain angle under the action of the mold.

8. Shaping is generally used after bending, deep drawing or other forming processes.

9. The spinning process is to fix the blank on the mold of the spinning machine. The blank is rotated with the main shaft of the spinning machine while operating the rod.

It is to press the rod to press the blank, and the blank gradually adheres to the mould, so as to obtain the required shape and size.

10. Brazing process: A method in which brazing metal is different from the brazing metal but has a low melting point as the filler metal. The brazing material is heated to melt and penetrate into the joint gap of the weldment, so that the weldment is firmly connected.

11. Welding technology processing technology mainly uses brazing technology (often referred to as tin welding) and resistance welding technology (including electric welding and seam welding)

At present, the more advanced technology has adopted laser welding technology.

12. Resistance welding is a method that uses the resistance heat generated when the current passes through the weldment to heat the joint of the weldment, and when the metal reaches the plastic state or the molten state, a certain pressure is applied to firmly connect the weldment together. The welding principle of resistance welding:

A. Thermal process and contact resistance. In electric welding, the heating of electric welding is realized by the heat generated by the electric current directly through the contact resistance inside the weldment and between the weldments. The heat generation of resistance welding should conform to Joule-Lenz's law. With different resistance welding methods, the resistance between the two electrodes is different. The presence of a certain resistance on the contact surface of the two weldments is called contact resistance. When the current passes through the contact surface of the two weldments, since the contact surface is actually not absolutely flat, the two weldments can only be in contact at a few points, so that when the current passes through the contact surface, it shrinks and concentrates on these points. This is a kind of micro The concentration of the resulting additional resistance is the main part of the formation of contact resistance. When the two weldments pass a certain current, the contact surface is first heated to a higher temperature, so the welding temperature is reached earlier. Therefore, resistance welding is to hear the resistance heat generated on the contact surface between the weldments as the main heat source. B. The formation process of the solder joint: a. Pre-compression stage b. Welding energization heating stage c. Forging stage

13. The structural characteristics of the two-piece metal box: A. The two-piece stamped can is formed by using an appropriate stamping process to make the round slab after several times of stamping and deep drawing. The cup-shaped or other-shaped can body after stamping and forming has complete, smooth, and seamless side walls. B. The bottom and the side walls are a whole, there is no rolling seam between the side wall and the bottom of the traditional three-piece combined tank. C. The two-piece stamped tank can be easily processed into various round or heterosexual containers, even cylindrical The structure of the two-piece can can also be conveniently processed and modified on the upper and lower edges of the column, which can improve the structural strength of the two-piece can and make the shape of the cylindrical structure container more beautiful D. Another feature of the two-piece cans structure is that most of the two-piece cans adopt an easy-to-open structure, which makes the opening of the two-piece cans convenient and easy. The two-piece tank container has five parts: tank bottom, lower edge part, tank side wall, upper edge part and tube end cover.

14. Three-piece metal box refers to a type of container composed of three parts: the body, the lid (top) and the bottom. The manufacturing process of the three-piece can body is as follows: sheet blanking (longitudinal cutting, cross-cutting) one blank falling into one bending (softening) one round one one overlapping positioning one one welding one one seam repair coating one one Dry one by one flanging one by one

15. Aerosol cans (spray cans) are airtight packaging containers with spray valves and spray propellants. The cans are required to withstand a certain internal pressure. They are generally made of high-strength steel, aluminum, plastic and glass. Performance requirements: A. Pressure resistance, aerosol cans must have long-term pressure resistance strength B. Sealability, propellant is easy to volatilize and leak, ensuring its tightness is one of the indispensable conditions C. Corrosion resistance, The shelf life of aerosols is mainly guaranteed by the corrosion resistance of the aerosol cans D. Safety a. Pressure b. Flammability c. Toxicity E. Surface quality

16. The metal box aerosol can container is a pressure resistant component, mainly made of tinplate, Wuxi thin steel plate, stainless steel plate and aluminum, such as tinplate three-piece cans or aluminum two-piece cans, the volume is from 15 to 1000ML, of which 140~ 650mL is the most used, accounting for about 3/4. Non-metallic containers generally include glass and plastic. The most used materials are tinplate and aluminum, while glass containers are beautiful in appearance and are used for perfume and toilet water.

17. The elements of double crimping of metal boxes: crimp thickness (T), crimp width (W), countersunk (C), body hook (BH), cover hook (CH), overlap length (OL) and Splicing rate (OL)

18. Thickness classification of steel drum materials: can be divided into heavy drums, medium drums, medium drums and light drums.

19. Barrel mouth piece structure type: A. Screw type a. Cock type b. Screw cap type B. Press type a. Press plug type b. Press cover type C. Top pressure type a. Gland type b. Bolt type D. Closed hoop type a. Screw type b. Lever type

20. The metal hose is a tubular packaging container made of metal with good plasticity and toughness.

21. The metal hose includes tube cover, tube neck, tube shoulder, tube wall, and seal. Common types of pipe diameters: ordinary nozzles, convex nozzles, plastic nozzles, and neckless nozzles.

22. The metal box has the characteristics of metal and plastic packaging containers, and has a double-layer structure and double sealing. It is a packaging container with extremely high safety and barrier properties, and is especially suitable for packaging dangerous goods. Iron-plastic drums have the following characteristics: A. Good strength, rigidity and surface hardness B. Good airtightness and chemical stability C. Complex structure, self-weight, high transportation and recycling costs, so it is mainly used in the transportation environment and packaging Under poor conditions such as dangerous goods.

23. The content of the structure design of the three-piece metal box: A. Select the appropriate metal material. B. Selection of tank type and tank specifications. C. Design of the tank body and calculation of the thickness of the tank body. D. Design of the tank cover and bottom. Double curling.

24. Three-piece metal box design steps: The most commonly used three-piece cans are round cans (vertical round cans, flat round cans), in addition to square cans, oval cans, trapezoidal cans and other special-shaped cans. In the selection of the tank shape, factors such as packaging requirements and cost should be considered comprehensively. The round tank is the easiest to manufacture, the most economical in materials, and the largest in all tank-shaped containers, but the shape is not distinctive. The special-shaped tank has unique shape, but it is difficult to manufacture, and the material and cost are relatively high. Considering from the most economical principle, round tanks should be selected as much as possible in the design, and special-shaped tanks should be selected only when there are special requirements. The specification of the tank is the specification and size of the tank container. The general three-piece can can be determined according to the standard specification series. For tank containers with special requirements or special shapes, the specifications can be determined according to actual needs. The process of determining the size of the three-piece can is: ①Determine the shape of the can according to the packaging requirements of the package; ②Calculate the required capacity according to the packaging volume of the package, and use the filling rate of the package (about 85%~95 %) to calculate the tank capacity; ③Finally select the tank size according to the calculation results.

25. The metal box packaging container is widely used because it has many unique advantages:

①Good mechanical properties. Compared with other packaging containers, such as plastic, glass, and paper containers, metal containers have higher strength, good rigidity, and are not easy to break. Not only can be used for small sales packaging, but also the main container for large transport packaging.

②Excellent barrier properties. The metal sheet has better barrier properties than any other material, and has good gas barrier properties, moisture resistance, light shielding properties, and fragrance retention properties. In addition, the sealing is reliable and can reliably protect the product.

③It is easy to realize automatic production. The production history of metal containers has a long history, the technology is mature, and a complete set of production equipment is matched with it, and the production efficiency is high, which can meet the packaging needs of various products.

④ Exquisite decoration. The metal material has good printing performance; the pattern and trademark are bright and beautiful, and the produced packaging container is eye-catching, which is an excellent sales packaging.

⑤Various shapes. Metal containers can be made into various shapes according to different needs, such as round, oval, square, horseshoe, trapezoid, etc., which not only meets the packaging needs of different products, but also makes packaging containers more varied and promotes sales.

(1) The metal box has excellent barrier properties and excellent comprehensive protection properties. The metal packaging material has a very low transmission rate of gas, water and water vapor (almost zero), good fragrance retention, and is completely opaque. Effectively avoid the harmful effects of ultraviolet rays; its gas barrier, moisture-proof, light-shielding and fragrance retention far exceed other types of packaging materials such as plastic and paper. Therefore, metal packaging can provide excellent protection for the contents, which is beneficial to maintaining the quality of the product for a long time.

(2) The metal box has good mechanical properties, workability and high-strength metal packaging materials have good ductility and high strength, can be processed by stamping, rolling, stretching, welding, etc., can be made into thin The wall, the packaging container with high compressive strength and not easy to break can also be combined with other materials to form a composite packaging material with excellent comprehensive performance.

(3) The metal box has a special metallic luster, and the surface is well decorated. The special metallic luster and exquisite decoration printing can make the appearance of the product rich and gorgeous, beautiful and marketable, and can increase the value of the product.

(4) The metal box is convenient and hygienic. The metal packaging container and inner coating generally meet the requirements of hygiene and safety, and the products packaged with it are convenient to carry and use (generally equipped with easy-opening devices, such as the pull ring of a can), Can adapt to different climatic conditions. And the waste disposal is good and can be recycled and reused. Although metal packaging materials have many advantages, they also have shortcomings, mainly including: poor chemical stability, especially steel materials are easy to rust, generally should be coated with anti-rust materials; acid and alkali resistance is weak, packaging acidic materials ( Especially for food), metal ions will precipitate and affect product quality, and generally require inner coating isolation protection; metal packaging materials are more expensive than other packaging materials, and the overall packaging cost is also higher.

26. Double crimping of the metal box: The sealing of the metal can refers to that the flanging of the can body and the round edge of the can lid are rolled in the sealing machine, so that the can body and the lid are rolled together and compressed to form a tight overlap. The process of curling. The formed hemming is called double hemming. The double crimping and sealing machine mainly relies on the pressure head, the tray head roller and the second roller to complete the metal sealing under the synergy of the four major components.

27. Metal box triple crimping: from the longitudinal cross-sectional view of the crimping edge of the metal barrel, a horizontal line is drawn at the center of the hook of the barrel body and the top (bottom) of the barrel. The thickness of a plate is calculated as one layer, from the innermost side. The thickness of the top (bottom) material of the barrel is counted to the thickness of the top (bottom) material of the outermost barrel. There are seven layers in total, so it is also called seven-layer curling. It is mainly used for heavy closed steel drums. Features of triple crimping: A. Better sealing performance B. Higher impact resistance C. Higher process requirements