阅读说明：本技术 一种多层箔材焊接机和焊接方法 (Multilayer foil welding machine and welding method ) 是由 翟月雯 贺小毛 周乐育 郝国建 郭硕 刘波 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种多层箔材焊接机,其包括上下竖直运动的上冲头,与上冲头固连的上加热组件,下加热组件,与所述上加热组件的正下方固定设置,底板,于所述下加热组件的下部支撑所述下加热组件,保护气氛箱,套设在所述上、下加热组件的外部,所述底板的上部,且所述底板将其底部封闭,所述上冲头从其顶部伸入所述保护气氛箱内。由上,向保护气氛箱内通入压力大于大气压力的保护气体,防止空气进入保护气氛箱内,使多层箔材加热时发生氧化反应；多层箔材置于下加热组件上,当上下加热组件合体时对两者之间的多层箔材加热加压使其焊接为复合箔材。(The invention discloses a multilayer foil welding machine which comprises an upper punch moving vertically, an upper heating assembly fixedly connected with the upper punch, a lower heating assembly fixedly arranged right below the upper heating assembly, a bottom plate, a protective atmosphere box and a welding wire, wherein the lower heating assembly is supported on the lower part of the lower heating assembly, the protective atmosphere box is sleeved outside the upper heating assembly and the lower heating assembly, the upper part of the bottom plate seals the bottom of the bottom plate, and the upper punch extends into the protective atmosphere box from the top of the upper punch. From above, protective gas with pressure greater than atmospheric pressure is introduced into the protective atmosphere box to prevent air from entering the protective atmosphere box, so that oxidation reaction occurs when the multilayer foil is heated; the multi-layer foil is arranged on the lower heating component, and when the upper heating component and the lower heating component are combined, the multi-layer foil between the upper heating component and the lower heating component is heated and pressurized to be welded into the composite foil.)

1. A multi-layer foil welding machine is characterized by comprising

An upper punch (31) vertically moving up and down,

an upper heating component (34) fixedly connected with the lower part of the upper punch (31),

a lower heating component (35) which is fixedly arranged right below the upper heating component (34) and the top of which is used for bearing the multilayer foil to be welded,

a base plate (36) supporting the lower heating unit (35) at a lower portion of the lower heating unit (35),

and the protective atmosphere box (33) is sleeved outside the upper heating component and the lower heating component, the upper part of the bottom plate (36) is sealed at the bottom of the bottom plate (36), and the upper punch (31) extends into the protective atmosphere box (33) from a through hole matched with the top of the upper punch.

2. A multi-layer foil welder according to claim 1, wherein said upper and lower heating assemblies are symmetrically arranged and each comprise: the outer parts of the upper heating component and the lower heating component are arranged towards the contact surface in sequence:

a cooling jacket (341,351) on which a plurality of water passages (342,352) are provided,

a thermal insulating jacket (345,355) disposed within and secured to the cooling jacket (341,351),

heating means disposed within and fixedly attached to said insulating sleeves (345,355),

and upper and lower molds (349,359) closing open ends of the cooling jackets (341,351) and the insulating jackets (345,355) and fixedly connecting the cooling jackets (341, 351).

3. A multi-layer foil welder according to claim 2, characterized in that it further comprises:

a thermal insulation member is disposed between the cooling jacket (341,351) and the thermal insulation jacket (345, 355).

4. A multi-layer foil welder according to claim 2, characterized in that said heating means comprise:

a heating pipe support (347,357) disposed within the thermal jacket (345,355),

a plurality of heating tubes (348,358) supported by the heating tube support (347,357).

5. A multi-layer foil welder according to any of the claims 1 to 4, characterized in that it further comprises:

the unwinding roller (1) and the winding roller (4) are respectively arranged on two sides of the protective atmosphere box (33) along the conveying direction of the multilayer foil, the multilayer foil is arranged on the unwinding roller (1), and one unwound end of the multilayer foil penetrates through the protective atmosphere box (33) and then is wound on the winding roller (4);

and the protective atmosphere box (33) corresponds to the two sides of the uncoiling roller (1) and the coiling roller (4) and is provided with through holes, and the multilayer foil penetrates through the protective atmosphere box (33) through the through holes.

6. A foil welding method using the multi-layer foil welder of any one of claims 1 to 5, characterized in that it comprises:

step 1, placing a plurality of layers of foils which are made into coils on an uncoiling roller (1) at one side of a multi-layer foil welding machine (3), and connecting the multi-layer foils at one uncoiled end to a coiling roller (4) at the other side of the multi-layer foil welding machine (3) after the multi-layer foils at the uncoiled end are placed on a lower heating assembly (35);

step 2, introducing inert gas into the protective atmosphere box (33) until the pressure is higher than the set pressure of the atmospheric pressure;

step 3, the upper punch head (31) moves downwards, and the upper die and the lower die (349,359) are closed;

step 4, the upper heating pipe (348,358) and the lower heating pipe (348,358) are connected with a power supply for heating, so that the upper die (349,359) and the lower die (349,359) reach the set temperature;

step 5, the upper punch head (31) applies multi-layer foil welding pressure to the upper die (349,359) and the lower die (349,359);

step 6, maintaining the temperature and the pressure of the multilayer foil for a certain period of time to enable the multilayer foil to be welded into a composite foil, disconnecting the power supply of the heating pipe (348,358), and removing the welding pressure of the multilayer foil applied by the upper punch (31);

step 7, the upper punch head (31) drives the upper die (349) to move upwards, and a nozzle in the protective atmosphere box (33) blows inert gas to the composite foil to rapidly cool the composite foil;

step 8, the winding roller (4) rotates to enable the composite foil to move forward by a distance less than the heating length of the multilayer foil;

and 9, repeating the steps 3 to 8 until the heating and the pressurization of the multilayer foil on the multilayer foil roll are finished.

7. Foil welding method according to claim 6, characterised in that the inert gas filled into the protective atmosphere box (33) in step 2 is helium at a pressure of 1.5x105 Pa.

8. Foil welding method according to claim 6, wherein the welding pressure applied in step 5 is 40-80 MPa.

Technical Field

The invention belongs to the technical field of mechanical heating equipment, and particularly relates to a multi-layer foil welding machine and a welding method.

Background

The common preparation method of the single-layer metal foil is flat-roll belt rolling, and four-roll or two-roll rolling is mostly adopted for softer metals such as aluminum foil and tin foil; for the foil of metal with high deformation resistance, such as copper, nickel, titanium, tungsten, molybdenum and the like, a rolling mill with large rigidity and thin roll diameter is adopted for rolling, and the foil with the single-layer thickness of 0.001mm can be rolled. In addition to the roll-to-roll method, copper foil for printed circuit production by the electrodeposition method and aluminum foil for packaging production by the vacuum deposition method are industrially used.

The composite foil with better comprehensive performance can be obtained by fusing foils made of different materials. The production of the composite foil needs to connect various foils together, the connection of various materials can be realized by pressure diffusion welding, and the connection is realized by mutual diffusion between atoms of a connecting interface after heat preservation and pressure maintaining for a certain time under the conditions of certain pressure and temperature.

However, the device and the rolling method for producing the single-layer metal foil are not suitable for welding the multi-layer foil because the device and the rolling method cannot keep the temperature and pressure for a long time.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a multi-layer foil welding machine, which welds multi-layer foils into composite foils.

The invention relates to a multi-layer foil welding machine, which comprises

An upper punch 31 which moves vertically up and down,

an upper heating assembly 34 fixedly connected to the lower portion of the upper punch 31,

a lower heating assembly 35 fixedly arranged right below the upper heating assembly 34, the top of the lower heating assembly is used for bearing the multilayer foil to be welded,

a base plate 36 supporting the lower heating element 35 at a lower portion of the lower heating element 35,

and the protective atmosphere box 33 is sleeved outside the upper heating component and the lower heating component, the upper part of the bottom plate 36 is arranged, the bottom of the bottom plate 36 is sealed by the bottom plate 36, and the upper punch 31 extends into the protective atmosphere box 33 from a through hole matched with the top of the upper punch.

From above, the protective gas with the pressure larger than the atmospheric pressure is introduced into the protective atmosphere box 33, so that air is prevented from entering the protective atmosphere box 33, and the multilayer foil is subjected to oxidation reaction when being heated; the multi-layer foil is arranged on the lower heating component, and when the upper heating component and the lower heating component are combined, the multi-layer foil between the upper heating component and the lower heating component is heated and pressurized to be welded into the composite foil.

Preferably, the upper and lower heating elements are symmetrically disposed and each comprise: the outer parts of the upper heating component and the lower heating component are arranged towards the contact surface in sequence:

the cooling jackets 341,351 with square grooves are provided with a plurality of water channels 342,352, the upper cooling jacket 341 is fixedly connected with the lower part of the upper punch 31, the lower cooling jacket 351 is fixedly arranged,

the heat preservation sleeves 345 and 355 with the square grooves are arranged in the cooling sleeves 341 and 351 and are fixedly connected with the cooling sleeves,

heating means disposed within and fixedly attached to said jackets 345,355,

and the upper and lower dies 349 and 359 are used for closing the opening ends of the cooling jackets 341 and 351 and the heat-insulating jackets 345 and 355 and are fixedly connected with the cooling jackets 341 and 351.

When the heating member is heated from above, the portions of the upper and lower dies corresponding to the heating member are heated, thereby heating the multilayer foil between the upper and lower dies.

Preferably, the method further comprises the following steps:

a thermal insulation member is disposed between the cooling jackets 341,351 and the thermal insulation jackets 345, 355.

The heat-insulating part between the cooling jacket and the heat-insulating jacket prevents heat from diffusing outwards

Preferably, the heating member includes:

heating tube supports 347,357, arranged inside said jackets 345,355,

a plurality of heating pipes 348,358 supported by the heating pipe supports 347, 357.

Preferably, the method further comprises the following steps: the unwinding roller 1 and the winding roller 4 are respectively arranged on the front side and the rear side of the protective atmosphere box 33 along the conveying direction of the multilayer foil, the multilayer foil is arranged on the unwinding roller 1, and one unwound end of the multilayer foil passes through the protective atmosphere box 33 and then is wound on the winding roller 4;

and through holes are formed in the protective atmosphere box 33 corresponding to the two sides of the uncoiling roller 1 and the coiling roller 4, and the multilayer foil penetrates through the protective atmosphere box 33 through the through holes.

By last, be provided with unwinding roller 1 and wind-up roll 4, can be after one section of multilayer foil is heated welding becomes composite foil, rotate wind-up roll 4 and make composite foil antedisplacement, multilayer foil puts down heating element and realizes continuous welding.

A foil welding method using the above-described multi-layer foil welder, comprising:

step 1, placing a coiled multilayer foil on an uncoiling roller 1 at one side of a multilayer foil welding machine 3, placing the multilayer foil at one unfolded end on a lower heating assembly 35, and then connecting the multilayer foil to a coiling roller 4 at the other side of the multilayer foil welding machine 3;

step 2, introducing inert gas into the protective atmosphere box 33 until the pressure is higher than the set pressure of the atmospheric pressure;

step 3, the upper punch 31 moves downwards, and the upper die 349 and the lower die 359 are closed;

step 4, the upper and lower heating pipes 348,358 are powered on to heat, so that the upper and lower dies 349,359 reach the set temperature;

step 5, the upper punch 31 applies a multi-layer foil welding pressure to the upper and lower dies 349, 359;

step 6, maintaining the temperature and pressure of the multilayer foils for a certain period of time to enable the multilayer foils to be welded into composite foils, disconnecting the power supplies of the heating pipes 348 and 358, and removing the welding pressure of the multilayer foils applied by the upper punch 31;

step 7, the upper punch 31 drives the upper die 349 to move upwards, and a nozzle in the protective atmosphere box 33 blows inert gas to the composite foil to rapidly cool the composite foil;

step 8, the wind-up roll 4 rotates to enable the composite foil to move forward by a distance less than the heating length of the multilayer foil;

and 9, repeating the steps 3 to 8 until the heating and the pressurization of the multilayer foil on the multilayer foil roll are finished.

After the heating in the step 4 and the application of the welding pressure in the step 5 and the maintenance of the welding pressure for a certain time, the multilayer foil is welded into the composite foil, and the composite foil is cooled in the step 7 to reduce the temperature and enhance the strength, so that the composite foil can be wound on the winding roller 4.

Preferably, the inert gas filled into the protective atmosphere box 33 in the step 2 is helium, and the pressure is 1.5x10⁵Pa。

Therefore, the inert gas with the pressure higher than the air pressure can prevent the air from entering the protective atmosphere box so as to prevent the multilayer foil from generating oxidation reaction with the air when being heated.

Preferably, the welding pressure applied in step 5 is 40 to 80 MPa.

Drawings

FIG. 1 is a front cross-sectional view of a multi-layer foil welder;

FIG. 2 is a top view of a multi-layer foil welder with the upper heating assembly removed;

fig. 3 is a graph of pressure versus heating temperature.

Detailed Description

As shown in fig. 1 and 2, the welding machine 3 for the multilayer foil is provided, an unwinding roller 1 and a winding roller 4 are respectively arranged in front of and behind the welding machine 3, the multilayer foil is wound on the unwinding roller 1, one end of the multilayer foil which is unwound is heated and pressed by the welding machine to be synthesized into a composite foil, and then the composite foil is wound on the winding roller 4 again.

The welding machine 3 comprises an upper punch 31, a connecting plate 32 fixedly connected with the lower end of the upper punch 31, an upper heating assembly 34 fixedly connected with the lower part of the connecting plate 32, and a lower heating assembly 35 arranged on a bottom plate 36, wherein the upper heating assembly, the lower heating assembly, the connecting plate 32 and part of the upper punch 31 are arranged in a protective atmosphere box 33; the top of the protective atmosphere box 33 is provided with an opening into which the upper punch 31 extends, and the press drives the upper punch 31 to carry the upper heating assembly 34 up and down in a reciprocating motion, and when the upper heating assembly 34 moves down to engage with the lower heating assembly, the multilayer foil is pressed between the upper and lower heating assemblies.

The upper heating assembly and the lower heating assembly are symmetrically arranged in structure, the heating assemblies, the heat preservation assembly and the dies are arranged on the upper heating assembly and the lower heating assembly, the dies are heated when the heating assemblies are heated, the multilayer foil between the upper die and the lower die is heated, the structure of the upper heating assembly is described by taking the heating assembly 34 as an example, the upper heating assembly 34 comprises an upper cooling jacket 341 which is an inverted square groove, a plurality of water channels 342 are arranged in the four inner walls and the top of the cooling jacket 341, and cooling water is introduced into the plurality of water channels 342 so as to cool the upper cooling jacket 341, so that the damage to operators is prevented; an upper backing plate 343, an upper heat insulation plate 344 and an upper heat insulation sleeve 345 are sequentially arranged in the cooling sleeve 341 from top to bottom, and the upper heat insulation sleeve 345 and the upper cooling sleeve 341 are inverted square grooves; an upper heat insulating sleeve 346 is arranged between the four side surfaces of the upper heat insulating sleeve 345 and the upper cooling sleeve 341; an upper heating pipe support body 347 is arranged in the upper heat insulation sleeve 345, two upper heating pipes 348 are arranged on the upper heating pipe support body 347 along the width direction of the welding machine, wherein the upper heating pipe support body 347 and the upper heat insulation sleeve 345 are fixed on an upper backing plate 343 through high-temperature alloy screws, and an upper die 349 for sealing the open ends of the upper cooling sleeve 341 and the upper heat insulation sleeve 345 is fixedly connected to the lower parts of the upper heating pipe support body 347, the upper heat insulation sleeve 345, the upper heat insulation sleeve 346 and the upper cooling sleeve 341 so that a cooling area, a heat preservation area and a heating area are sequentially formed in the upper cooling sleeve 341 from outside to inside.

When the upper and lower heating pipes 348,358 of the upper and lower heating assemblies are heated, the upper and lower heating pipe supports 347,357 conduct heat, the upper and lower molds 349,359 and the upper and lower heating pipe supports are heated, and when the upper and lower molds are closed, the multi-layer foils between the upper and lower molds are heated and fused together to form the composite foil. According to the thickness tmm required by the composite foil, cavities with the depth of t/2mm are respectively processed on the opposite surfaces of the upper flat plate die and the lower flat plate die, and the width of each cavity is 1mm larger than that of the composite foil.

The upper and lower insulating sleeves 345 and 355 prevent heat generated from the upper and lower heating pipes 348 and 358 placed therein from being emitted outward, and seal most of the heat inside the insulating sleeves for heating the multi-layered foil 2, an upper heat insulating plate 344 provided at an upper portion of the upper insulating sleeve 345, a lower heat insulating plate 354 provided at a bottom portion of the lower insulating sleeve 355, and an upper heat insulating sleeve 346 provided between four sides of the upper insulating sleeve 345 and the upper cooling sleeve 341, and a lower heat insulating sleeve 356 provided between four sides of the lower insulating sleeve 355 and the lower cooling sleeve 351 to further prevent the heat from being transmitted outward.

The upper insulation plate 344, the lower insulation plate 354, the upper insulation sleeve 346, and the lower insulation sleeve 356 are provided outside the upper and lower insulation sleeves 345,355 to prevent heat therein from being diffused outward, and thus these four are referred to as insulation members.

When the upper heating component and the lower heating component are combined, the multilayer foil arranged between the upper heating component and the lower heating component is heated and pressurized, the composite metal foil is pressed at high temperature, and the working temperature is usually the melting point T of metal_mAt a temperature of-200 ℃, at which the composite foil is easily oxidized to lose conductivity, a protective atmosphere box 33 is filled with an inert gas or other reducing gases under a certain pressure, wherein the inert gas and other reducing gases are collectively referred to as protective gases and are generally filled with a pressure of 1.5x10⁵And the helium gas of Pa forms positive pressure in the protective atmosphere box 33, so that air cannot enter the protective atmosphere box 33, and the composite foil is prevented from being oxidized in the whole welding process.

After introducing a protective gas under a certain pressure into the protective atmosphere box 33, the mold heating system starts to energize and heat the upper and lower heating pipes 348 and 358. The heating temperature of the mold is controlled by PID, and thermocouples are arranged in the heating zones 37 of the upper mold and the lower mold to measure the heating temperature of the mold. The PID controller is connected to a thermocouple (not shown) to receive the feedback temperature of the mold, and the PID controller is connected to a heating power supply to control the switching of the power supply. The PID controller sets the temperature to be heated, the power switches of the upper heating pipe 348 and the lower heating pipe 358 are switched on to start heating, when the temperature of the heating area 37 of the upper die and the lower die rises to the set temperature, the thermocouple feeds back a temperature signal to the PID controller, the PID controller switches off the power switches, when the temperature of the heating area 37 of the upper die and the lower die drops to the set lower temperature limit, the PID controller is switched on to continue heating the die, and the temperature of the heating area 37 of the upper die and the lower die is always ensured to be the proper welding temperature. The better temperature control precision is +/-20 ℃, and the composite foil can be ensured to be welded into a whole.

In the process of heating, pressurizing and welding the multilayer foil into the composite foil, the welding pressure of the upper punch acting on the upper die and the lower die is very important. The metal in the welding area is subjected to plastic deformation, recrystallization, diffusion and the like under the action of welding pressure, so that the multilayer foils are welded together. There is a relationship between bonding pressure and temperature as shown in fig. 3, with the higher the bonding zone temperature, the lower the bonding pressure. The welding pressure is an important condition for enabling the surfaces of all foils to be in close contact to form a welding area, the heating can improve the plasticity of the metal, reduce the deformation resistance of the metal and obviously reduce the required welding pressure, and meanwhile, the heating can increase the activity and the diffusion capacity of metal atoms to promote the interaction among the atoms to easily realize welding. Therefore, it is important to control the welding pressure of the composite foil, and under the condition that the pressure exerted on the upper and lower dies by the upper punch is constant, the welding pressure is reduced by increasing the bearing areas of the upper and lower dies, and the welding pressure is generally 40-80 MPa.

The composite foil finishes welding after sufficient heat preservation and pressure maintaining time, at the moment, a PID controller disconnects the power supply of an upper heating pipe and a lower heating pipe, an upper die 349 moves upwards under the driving of an upper punch 31 to be separated from a lower die 359, a nozzle (not marked in the figure) in a protective atmosphere box 33 is aligned with the welded composite foil at the heating area 37 of the lower die and blows inert gas, so that the composite foil is cooled rapidly, the strength of the composite foil is increased along with the reduction of the temperature and generally cooled to below 200 ℃, the composite foil can bear the pulling force generated by the rotation of a winding roller 4, and the continuous pressing of the composite foil can be realized.

When multilayer foil material passes through this welding machine, because be filled with inert gas in the protective atmosphere case 33, from left to right in the protective atmosphere case 33, multilayer foil material passes through in proper order, the outer left cooling zone of bed die, on, left heat preservation district in the bed die, on, the zone of heating in the bed die, on, right heat preservation district in the bed die and on, the outer right cooling zone of bed die, and like this, multilayer foil material preheats before getting into the zone of heating in the bed die, then get into the zone of heating and heat, heat preservation

The heating process of the multilayer foil is explained in detail below:

step 1, placing a coiled multilayer foil on an uncoiling roller 1 in front of a multilayer foil welding machine 3, placing the multilayer foil at one unfolded end on a lower heating assembly 35, and then connecting the multilayer foil to a coiling roller 4 behind the multilayer foil welding machine 3;

step 2, introducing inert gas with pressure higher than atmospheric pressure into the protective atmosphere box 33;

step 3, the upper punch 31 moves downwards, and the upper die 349 and the lower die 359 are closed;

step 4, the upper and lower heating pipes 348,358 are powered on to heat, so that the upper and lower dies 349,359 reach the set temperature;

step 5, the upper punch 31 applies a multi-layer foil welding pressure to the upper and lower dies 349, 359;

step 6, maintaining the temperature and pressure of the multilayer foils for a certain period of time to enable the multilayer foils to be welded into composite foils, disconnecting the power supplies of the heating pipes 348 and 358, and removing the welding pressure of the multilayer foils applied by the upper punch 31;

step 7, the upper punch 31 drives the upper die 349 to move upwards, and a nozzle in the protective atmosphere box 33 blows protective gas to the composite foil to rapidly cool the composite foil;

step 8, the wind-up roll 4 rotates to enable the composite foil to move forward by a distance less than the heating length of the multilayer foil;

after the multilayer foils are heated and pressurized for a certain time and become the composite foils, the winding roller rotates to enable the distance of the forward movement of the composite foils to be smaller than the heating length of the multilayer foils, so that the heated multilayer foils have one section of the composite foils as transition, and the formed composite foils are stable in performance and uniform in quality.

And 9, repeating the steps 3 to 8 until the heating and the pressurization of the multilayer foil on the multilayer foil roll are finished.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

The multi-layer foil welding machine can weld some plates besides multi-layer foils.