Preparation system of high-tin-content copper-tin brazing filler metal grid-shaped composite strip

Abstract

The invention provides a preparation system for a high-tin-content copper-tin brazing filler metal grid-shaped composite strip. The preparation system comprises traction equipment, slotting equipment and casting equipment. The traction equipment is used for pulling the copper strip to sequentially penetrate through the slotting equipment and the casting equipment in sequence; the grooving equipment is used for forming a groove in the surface of the copper strip when the copper strip passes through; and the casting equipment is used for injecting molten tin in a molten state into a groove in the surface of the copper strip when the copper strip passes through. The tin material and the copper material are combined in a liquid tin casting mode, the technical requirement is low, the uniformity of the combination face can be effectively guaranteed, and industrial production of the high-tin-content copper-tin brazing filler metal grid-shaped composite strip can be conveniently achieved.

Description

Technical Field

[0001] The invention relates to the technical field of brazing materials, and in particular to a preparation system for a high-tin-content copper-tin brazing grid-shaped composite strip. Background Art

[0002] When brazing carbon steel and stainless steel, pure copper is the most cost-effective brazing material; especially when brazing continuously in a reducing atmosphere, pure copper brazing material is used, which not only has high production efficiency, high joint strength, and good welding effect, but also has low price, which is only 2-5% of the price of silver brazing material. However, the heating temperature of pure copper brazing is high, generally above 1100℃, which leads to the degradation of the performance of carbon steel and stainless steel base materials on the one hand, and large heat loss on the other hand, which is not energy-saving and environmentally friendly.

[0003] In order to lower the melting point of copper, a low-melting-point element tin (melting point is 231.89°C) is added to copper. The copper-tin solder strip with added elemental tin retains the welding advantages of copper while lowering the melting point of copper.

[0004] The amount of tin added determines the melting point and performance of copper. Less tin added means a high melting point and good forming performance; more tin added means a low melting point but poor processing performance.

[0005] At present, the processing method of copper-tin solder strip generally adopts the processes of smelting, casting, rolling, extrusion and the like of copper-tin alloy for production, or the tin plate is placed between two copper plates and rolled. However, the above two methods are suitable for making copper-tin solder strip with low tin content. When the tin content is high, it is not easy to process and form. During the rolling process of copper-tin multilayer composite strip, tin is easily squeezed out, resulting in a reduction in the effective amount of tin added, and during the brazing heating process, the tin in the middle layer first melts into liquid, which is easily squeezed out of the weld due to force, resulting in a reduction in the tin content of the copper-tin solder, leading to an increase in the melting temperature and the brazing heating temperature.

[0006] Based on the above problems, our company has disclosed a high-tin content copper-tin solder grid-shaped composite strip and its preparation method (patent number: 202111253842.4). The high-tin content copper-tin solder grid-shaped composite strip is obtained by "opening a plurality of parallel and spaced grooves on one side of the copper plate, placing the tin bar in the groove, and then melting the tin bar by flame brazing, and connecting it with the copper plate after cooling and solidification to form a whole." This preparation method of embedding the tin bar into the groove and then brazing the tin bar in the groove to the copper around the groove is not conducive to the industrialization and industrialization of the enterprise, and the welding method makes the way of combining the tin bar with the groove difficult to operate, and the combination effect cannot be effectively guaranteed. Summary of the invention

[0007] In order to solve the technical problems existing in the background technology, the present invention proposes a preparation system for a high-tin content copper-tin solder grid-shaped composite strip.

[0008] The present invention provides a preparation system for a high-tin content copper-tin solder grid-shaped composite strip, comprising: a traction device, a slotting device and a casting device;

[0009] The traction equipment is used to pull the copper strip through the slotting equipment and casting equipment in sequence;

[0010] The slotting equipment is used to create grooves on the surface of the copper strip as it passes through;

[0011] The casting equipment is used to inject molten liquid tin into the grooves on the surface of the copper strip as the copper strip passes.

[0012] Preferably, a cooling device is also included, which is arranged at the next station of the casting device to cool the liquid tin cast in the groove to turn the liquid tin into a solid state.

[0013] Preferably, it also includes a rolling device, which is arranged at the next station of the cooling device and is used to roll the combination of the copper strip and the solid tin.

[0014] Preferably, the rolling equipment comprises an upper roller and a lower roller forming a material passing gap therebetween, and a power device driving the upper roller and the lower roller to rotate.

[0015] Preferably, the cooling device comprises a low-temperature channel through which the copper strip can pass and a cooling device for forming a low-temperature environment inside the low-temperature channel.

[0016] Preferably, a dust removal device for cleaning waste chips and dust in the groove and on the surface of the copper strip is provided between the grooving device and the casting device.

[0017] Preferably, the dust removal equipment comprises a blowing device.

[0018] Preferably, the dust removal equipment also includes a dust suction device.

[0019] Preferably, a rod is provided on the side of the casting device away from the trough device, and the position of the rod is set according to the position of the groove on the copper belt, so that when the copper belt passes through its position, one end of the rod is located in the groove.

[0020] Preferably, a heating element is provided inside the rod.

[0021] Preferably, the grooving equipment includes a workbench, a cutter head located above the workbench, and a driving device for driving the cutter head to perform the grooving operation; there are multiple cutter heads, all of which are arranged at intervals along the width direction of the copper strip, and all of the cutter heads are driven by the driving device to perform the grooving operation at the same time; the copper strip passes under each cutter head along the surface of the workbench under the traction of the traction device.

[0022] Preferably, a first roller group is arranged above the edge of one side of the copper belt on the workbench, and the first roller group includes several first rollers arranged along the traction direction of the copper belt; a second roller group is arranged above the edge of the other side of the copper belt on the workbench, and the second roller group includes several second rollers arranged along the traction direction of the copper belt.

[0023] Preferably, the first roller and the second roller are rubber rollers.

[0024] Preferably, the casting equipment comprises a casting container located above the copper strip and a plurality of casting ports arranged on the casting container, all the casting ports are arranged at intervals in the width direction of the copper strip, and each casting port corresponds to each cutter head one by one.

[0025] Preferably, a heating device is provided on the peripheral wall of the casting container.

[0026] Preferably, the casting equipment further comprises a supporting platform, which is located below the casting container, and the copper strip passes under the casting port along the surface of the supporting platform under the traction of the traction device.

[0027] Preferably, the traction device comprises an unwinding machine for performing the unwinding work and a traction mechanism for pulling the copper strip to move.

[0028] Preferably, the traction mechanism comprises a winder for performing a winding operation.

[0029] In the present invention, the copper strip is pulled by a pulling device and sequentially passes through a slotting device and a casting device. When passing through the slotting device, the slotting device opens a groove on the strip surface. When passing through the casting device, the casting device casts liquid tin into the groove and fills the groove cavity, thereby obtaining a high-tin content copper-tin solder grid-shaped composite strip. The preparation system combines the tin material with the copper material by liquid tin casting, has low technical requirements, can effectively ensure the uniformity of the bonding surface, and is convenient for realizing the industrial production of high-tin content copper-tin solder grid-shaped composite strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the working principle of a preparation system for a high-tin content copper-tin solder grid-shaped composite strip proposed by the present invention;

[0031] Figure 2 This is a schematic diagram of the strip surface structure of the copper strip after slotting in the preparation system of the high-tin content copper-tin solder grid-shaped composite strip proposed by the present invention;

[0032] Figure 3 The present invention provides a schematic diagram of the working principle of the rods in the system for preparing a high-tin content copper-tin solder grid-shaped composite strip. DETAILED DESCRIPTION

[0033] Reference Figure 1-2The present invention provides a preparation system for a high-tin content copper-tin solder grid-shaped composite strip, comprising: a traction device 1, a slotting device 2 and a casting device 3;

[0034] The traction device 1 is used to drive the copper strip 4 to move along a predetermined route, so that the copper strip 4 passes through the slotting device 2 and the casting device 3 in sequence. The traction device 1 includes an unwinder for performing unwinding work and a traction mechanism for pulling the copper strip 4 to move. During operation, a copper strip 4 roll formed by winding the copper strip 4 is pre-installed on the unwinder, and then the traction mechanism pulls the copper strip 4 forward to make the copper strip 4 pass through the slotting device 2 and the casting device 3 in sequence.

[0035] The slotting device 2 is used to open grooves on the surface of the copper belt 4. The slotting device 2 includes a workbench 21, a cutter head 22 located above the workbench 21, and a driving device for driving the cutter head 22 to perform the slotting operation; there are multiple cutter heads 22, all of which are arranged at intervals along the width direction of the copper belt 4, and all of the cutter heads 22 are driven by the driving device to perform the slotting operation at the same time; the copper belt 4 passes under each cutter head 22 along the surface of the workbench 21 under the traction of the traction device 1, and when the copper belt 4 passes through, the cutter heads 22 located above the copper belt 4 move simultaneously to open a number of parallel and spaced grooves on the belt surface of the copper belt 4.

[0036] The casting device 3 is used to inject liquid tin in a molten state into the grooves on the surface of the copper strip 4. The casting device 3 includes a casting container 31 located above the copper strip 4 and a plurality of casting ports 32 arranged on the casting container 31. All the casting ports 32 are arranged at intervals in the width direction of the copper strip 4, and each casting port 32 corresponds to each cutter head 22 one by one. When the copper strip 4 after surface grooving passes under the casting port 32, each casting port 32 injects liquid tin into each groove to combine the tin and copper together, thereby obtaining a high-tin content copper-tin solder grid-shaped composite strip.

[0037] As can be seen from the above, when the present invention is working, the traction device 1 pulls the copper strip 4 through the slotting device 2 and the casting device 3 in sequence. When the copper strip 4 passes through the slotting device 2, the slotting device 2 opens a groove on the strip surface of the copper strip 4. When the groove opened on the copper strip 4 enters the position of the casting device 3, the casting device 3 casts liquid tin into the groove and fills the groove cavity to obtain a high-tin content copper-tin solder grid composite strip.

[0038] The system for preparing a high-tin content copper-tin solder grid-shaped composite strip proposed by the present invention also includes a cooling device 5 and a rolling device 6. The cooling device 5 is arranged at the next station of the casting device 3 to accelerate the cooling of the liquid tin, so that the liquid tin cast in the groove is quickly converted into solid tin. The rolling device 6 is arranged at the next station of the cooling device 5 to roll the combination of the copper strip 4 and the solid tin, so that the combination of the two is more firm and the surface is smooth.

[0039] The cooling device 5 in this embodiment can be an air cooling device or a water cooling device, or the cooling device 5 can include a low-temperature channel for the copper strip 4 to pass through and a cooling device for forming a low-temperature environment inside the low-temperature channel. The cooling device is a cooling fan or a condenser coiled on the inner wall of the low-temperature channel.

[0040] The rolling equipment 6 in this embodiment includes an upper roller and a lower roller forming a feeding gap therebetween, and a power device driving the upper roller and the lower roller to rotate. When the combination of the copper strip 4 and tin passes through the feeding gap, it is rolled by the rotating upper roller and the lower roller.

[0041] In addition, in this embodiment, a dust removal device 7 is arranged between the slotting device 2 and the casting device 3 to clean the waste and dust in the groove and on the surface of the copper strip 4.

[0042] The dust removal device 7 includes a blowing device, which blows away the waste on the groove and the surface of the copper belt 4 when working; the dust removal device 7 also includes a dust suction device, which collects the waste and dust.

[0043] Reference Figure 3 In addition, in this embodiment, a rod 8 is arranged on the side of the casting device 3 far from the trough device 2. The position of the rod 8 is arranged according to the position of the groove on the copper belt 4, so that when the copper belt 4 passes through its position, one end of the rod 8 is located in the groove. When the copper belt 4 moves, the rod 8 squeezes the liquid tin in the groove to move to both sides, thereby making it more fully contact with the side wall of the groove. In order to prevent the low temperature on the surface of the rod 8 from affecting the liquid tin, a heating element is arranged in the rod 8 in this embodiment to heat the rod.

[0044] Furthermore, the traction mechanism in this embodiment includes a winder for performing the winding work, so that the winder can wind the other end of the copper strip 4.

[0045] In this embodiment, the workbench 21 is provided with a first roller group 9 above one edge of the copper belt 4, and the first roller group 9 includes a plurality of first rollers arranged along the pulling direction of the copper belt 4; the workbench 21 is provided with a second roller group above the other edge of the copper belt 4, and the second roller group includes a plurality of second rollers arranged along the pulling direction of the copper belt 4. When the copper belt 4 enters the workbench 21, the edge parts on both sides thereof are pressed by the first roller and the second roller respectively, so as to ensure that the grooved part of the copper belt 4 can remain relatively stable when the grooves are cut.

[0046] In this embodiment, the first roller and the second roller are both rubber rollers. In addition, a first baffle and a second baffle are provided on the table surface of the workbench 21. The first baffle and the second baffle are provided opposite to each other, and the spacing between the first baffle and the second baffle is adapted according to the width of the copper belt 4, so that the copper belt 4 can pass between the first baffle and the second baffle, and the sides of the copper belt 4 are constrained by the first baffle and the second baffle to ensure the consistency of the relative position of the slotted parts.

[0047] In this embodiment, a heating device is provided on the peripheral wall of the casting container 31 to heat or keep the casting container 31 warm, thereby ensuring the stability of the internal temperature of the casting container 31 and preventing the fluidity of the liquid tin inside from being weakened.

[0048] In addition, the casting device 3 further comprises a supporting platform 33 , which is located below the casting container 31 . The copper strip 4 passes under the casting port 32 along the surface of the supporting platform 33 under the traction of the traction device 1 .

[0049] In summary, the copper strip 4 in the present invention passes through the slotting device 2 and the casting device 3 in sequence under the traction of the traction device 1, and when passing through the slotting device 2, the slotting device 2 opens a groove on its strip surface, and when passing through the casting device 3, the casting device 3 casts liquid tin into the groove and fills the groove cavity, thereby obtaining a high-tin content copper-tin solder grid-shaped composite strip. The preparation system uses liquid tin casting to combine the tin material and the copper material, has low technical requirements, can effectively ensure the uniformity of the bonding surface, and is convenient for realizing the industrial production of high-tin content copper-tin solder grid-shaped composite strips.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip, characterized in that: include: A pulling device (1), a slotting device (2) and a casting device (3); The traction device (1) is used to pull the copper strip (4) to sequentially pass through the slotting device (2) and the casting device (3); The groove forming device (2) is used to form grooves on the surface of the copper belt (4) when the copper belt (4) passes through; The casting device (3) is used to inject liquid tin in a molten state into the grooves on the surface of the copper strip (4) when the copper strip (4) passes by.

2. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 1, characterized in that: It also includes a cooling device (5) which is arranged at the next station of the casting device (3) and is used to cool the liquid tin cast in the groove so that the liquid tin becomes solid.

3. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 2, characterized in that: It also includes a rolling device (6) which is arranged at the next station of the cooling device (5) and is used to roll the combination of the copper strip (4) and the solid tin; Preferably, the rolling equipment (6) comprises an upper roller and a lower roller forming a material passing gap therebetween, and a power device for driving the upper roller and the lower roller to rotate; Preferably, the temperature reduction device (5) comprises a low-temperature channel through which the copper strip (4) can pass and a cooling device for forming a low-temperature environment inside the low-temperature channel.

4. The system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 1, characterized in that: A dust removal device (7) is provided between the slotting device (2) and the casting device (3) for cleaning waste chips and dust in the slot and on the surface of the copper strip (4); Preferably, the dust removal device (7) comprises a purge device; Preferably, the dust removal equipment (7) also includes a dust suction device.

5. The system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 1, characterized in that: A rod (8) is provided on the side of the casting device (3) away from the groove device (2), and the position of the rod (8) is set according to the position of the groove on the copper belt (4), so that when the copper belt (4) passes through the position where the rod (8) is located, one end of the rod (8) is located in the groove; Preferably, a heating element is provided inside the rod (8).

6. The system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 1, characterized in that: The slotting device (2) comprises a workbench (21), a cutter head (22) located above the workbench (21), and a driving device for driving the cutter head (22) to perform a slotting operation; a plurality of cutter heads (22) are provided, all of which are arranged at intervals along the width direction of the copper strip (4), and all of the cutter heads (22) are driven by the driving device to perform the slotting operation simultaneously; the copper strip (4) passes under each cutter head (22) along the surface of the workbench (21) under the traction of the traction device (1).

7. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 6, characterized in that: A first roller group (9) is arranged above the edge of one side of the copper belt (4) on the workbench (21), and the first roller group (9) includes a plurality of first rollers arranged along the pulling direction of the copper belt (4); a second roller group is arranged above the edge of the other side of the copper belt (4) on the workbench (21), and the second roller group includes a plurality of second rollers arranged along the pulling direction of the copper belt (4); Preferably, the first roller and the second roller are rubber rollers.

8. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 6, characterized in that: The casting device (3) comprises a casting container (31) located above the copper strip (4) and a plurality of casting ports (32) arranged on the casting container (31), wherein all the casting ports (32) are arranged at intervals in the width direction of the copper strip (4), and each casting port (32) corresponds to each cutter head (22) one by one; Preferably, a heating device is provided on the peripheral wall of the casting container (31).

9. A system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 8, characterized in that: The casting device (3) further comprises a supporting platform (33), which is located below the casting container (31). The copper strip (4) passes under the casting port (32) along the surface of the supporting platform (33) under the traction of the traction device (1).

10. The system for preparing a high-tin content copper-tin solder grid-shaped composite strip according to claim 1, characterized in that: The traction device (1) comprises an unwinding machine for performing unwinding work and a traction mechanism for pulling the copper strip (4) to move; Preferably, the traction mechanism comprises a winder for performing a winding operation.

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