Parallel seal welding carrier

Abstract

The utility model discloses a parallel seal welding carrier, which belongs to the field of metal packaging and comprises a carrier frame. The electromagnet groups are mounted in the carrier frame; the positive and negative electrode lead wire circuit board is arranged on the carrier frame between the electromagnet groups, is connected with the anodes of the electromagnet groups through electromagnet positive electrode lead wires and is connected with the cathodes of the electromagnet groups through electromagnet negative electrode lead wires; the seal welding clamp is arranged on the carrier frame, and a plurality of metal tube shell mounting structures correspondingly arranged over the electromagnet sets are arranged on the seal welding clamp; the metal tube shell is fixed in the metal tube shell mounting structure and is connected with the electromagnet group; and the metal cover plate is correspondingly arranged on the metal tube shell. According to the carrier, the cover plate and the tube shell are automatically attracted and aligned through magnetic force, the sealing and welding space is saved, sealing and welding of the small-size shell are achieved, the magnetic force between the cover plate and the shell is controlled by changing the current of the electromagnet according to the cover plate and the shell of different sizes, and the sealing and welding technological process is more reliable.

Description

Technical Field

[0001] The utility model relates to the field of metal packaging, in particular to a parallel sealing and welding carrier. Background Art

[0002] In the past 20 years, the packaging industry has experienced a process of development from dual in-line package and pin grid array package to 50mil surface mounted ceramic leadless chip carrier, plastic lead chip carrier, small outline IC package and solder ball array package array package. In the above different packaging scenarios, according to the requirements of use, it can generally be divided into metal, plastic and ceramic packaging forms. Plastic packaging has low cost, but poor heat dissipation performance and reliability, and is not suitable for high temperature environments. Metal packaging has excellent heat dissipation performance, as well as good high strength, high stability, reliable anti-interference performance and corrosion resistance, but has the disadvantages of high cost, large weight, simple appearance and difficulty in customization. Ceramic packaging has the advantages of high temperature resistance and high strength, but lacks good toughness and is easy to break. In addition, the production process of ceramic shells is complicated, resulting in high cost. In specific usage scenarios, it is necessary to choose a suitable packaging form.

[0003] Because of the excellent heat dissipation performance and high reliability of metal packaging, it is widely used in many scenarios such as power electronics and high heat generation. In these applications, it is necessary to integrate electronic components inside the metal shell, such as diodes, power amplifier transistors, integrated circuit IC chips, and circuit boards for interconnecting components. In order to increase the service life of the product, airtight packaging is often performed to prevent the intrusion of pollutants (such as liquids, solids or gases) for a certain period of time. Generally, the acceptable leakage rate of airtight packaging is specified according to my country's national standards or MIL-STD-883 standards.

[0004] Common methods for metal packaging are parallel sealing, projection welding or energy storage welding. Projection welding or energy storage welding forms a weld between the cap and the package shell through a large pulse current. The advantages are short processing time and low cost, and the disadvantages are that it is difficult to remove the sealed cap to repair the internal circuit. Re-capping the sealed package is a destructive process, and the package must be replaced. Parallel sealing is to achieve airtight sealing by rolling the edges of multiple cover plates over a pair of electrodes to produce a series of overlapping welds. Compared with other methods, the parallel sealing process is relatively slow, but it is easy to re-cap the package by grinding off the edges of the cover plate. After grinding the package shell once, another cover plate can be used for re-packaging, and reliability can be guaranteed. Using this packaging form can repair the internal circuit, which is conducive to the secondary maintenance of the module circuit. In addition, the metal shell and cover plate that are generally packaged using parallel sealing are made of ASTM F-15 alloy, that is, Fe54-Ni9-Col7 alloy (commonly known as Kovar alloy). Some metal shells and cover plates are also made of copper, stainless steel or tungsten alloy.

[0005] During the parallel welding process, the alignment of the cover plate and the packaging shell is very critical, which is generally completed in the packaging working chamber. There are two common alignment methods. One is to use an optical alignment system to use a suction nozzle to adsorb the cover plate, and then use image recognition technology to place the cover plate on the packaging shell, and then start the electrode wheel to weld and package the cover plate and the shell. Another way is to manually position the cover plate and the packaging shell. After the positions of the two are fixed, in order to prevent the cover plate from shifting during the packaging process, it is necessary to use a mechanical device to apply pressure to the cover plate. Common ones include pressure needles, pressure rods, etc. In addition, in order to prevent the cover plate and the shell from shifting during the continuous welding process, after the cover plate is placed on the metal shell, single-point spot welding is generally performed to fix the cover plate and the shell. In addition, the step-shaped cover plate can also ensure the quality of welding.

[0006] However, whether using an optical alignment system or a mechanical alignment device, there must be a suction nozzle, a pressure needle or a pressure rod on the cover plate, which results in very limited space between the parallel electrode wheels, and also results in a limited size of the shell that can be sealed. When the size of the shell is less than 5*5 mm, the airtightness effect after parallel sealing is not good or the yield of the product is very low. The main reasons are: First, small-sized cover plates are often difficult to process into step structures, and are generally flat structures, so the cover plate can move freely on the metal shell under the action of external force. Second, due to space limitations, small-sized metal tube shells require the use of small-sized suction nozzles, pressure needles or pressure rods, so the contact area between the suction nozzle, pressure needle or pressure rod and the cover plate is very small, and the pressure applied to the cover plate is difficult to control at the center of the cover plate. The pressure applied to the non-center position will cause the cover plate to warp on the shell. Therefore, during spot welding, there will be a gap between the warped cover plate and the shell, which cannot meet the airtightness requirements. Third, when the parallel-sealed electrode wheel is pressed down to the cover plate, the displacement accuracy of the parallel-sealed electrode wheels placed at both ends of the shell or the imbalance of the downward pressure will cause relative displacement / warping between the cover plate and the shell, which will also cause gaps, fail to meet the airtightness requirements, and cause sealing failure. Utility Model Content

[0007] The utility model aims to overcome the problems existing in the existing parallel welding process and provides a parallel welding carrier.

[0008] The purpose of this utility model is achieved through the following technical solutions:

[0009] A parallel sealing and welding carrier is provided, comprising:

[0010] Carrier frame;

[0011] a plurality of electromagnet groups mounted in the carrier frame;

[0012] A positive and negative lead circuit board, which is mounted on the carrier frame between the electromagnet groups and connected to the positive pole of the electromagnet group through the electromagnet positive lead and connected to the negative pole of the electromagnet group through the electromagnet negative lead;

[0013] A sealing welding fixture is arranged on the carrier frame, and a plurality of metal tube shell mounting structures are arranged on the sealing welding fixture corresponding to the metal tube shell mounting structures arranged directly above the electromagnet group;

[0014] a metal tube shell, which is fixed in the metal tube shell mounting structure and connected to the electromagnet group; and

[0015] A metal cover plate is correspondingly arranged on the metal tube shell.

[0016] In a parallel welding carrier provided in some possible embodiments, a mark is provided at the center of the upper surface of the electromagnet in the electromagnet group, and the structure center of the welding fixture and the structure center of the metal tube shell are connected in sequence above the mark.

[0017] In a parallel welding carrier provided in some possible embodiments, the mark is in the shape of a cross.

[0018] In a parallel welding carrier provided in some possible embodiments, the carrier frame is a stainless steel frame, an aluminum frame or a copper frame.

[0019] In a parallel welding carrier provided in some possible embodiments, the metal tube shell is a Kovar alloy tube shell.

[0020] In a parallel welding carrier provided in some possible embodiments, the metal cover plate is a Kovar alloy cover plate.

[0021] In a parallel welding carrier provided in some possible embodiments, an adjustable power supply is externally connected to the terminals of the electromagnet positive lead and the electromagnet negative lead.

[0022] In a parallel welding carrier provided in some possible embodiments, the electromagnets in the electromagnet group are all in the shape of long strips.

[0023] It should be further explained that the technical features corresponding to the above embodiments can be combined or replaced with each other to form a new technical solution without conflict.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] (1) The utility model installs an electromagnet carrier on a parallel welding workbench, and the metal cover plate and metal tube shell placed on the carrier are magnetized under the action of magnetic force, and the cover plate and the tube shell attract each other, that is, they can be self-aligned, so there is no need to use an optical alignment system for alignment. In addition, the metal cover plate and the shell attract each other under the action of magnetic force, which is equivalent to using a pressure needle / pressure rod to apply downward pressure to the cover plate, so the pressure needle / pressure rod is no longer needed, which saves welding space, so it can achieve welding of small-sized shells.

[0026] (2) In one example, the metal tube shell and the metal cover plate are both made of Kovar alloy, which has paramagnetism, making it easier for the cover plate and the tube shell to attract and align with each other.

[0027] (3) In one example, a mark is provided at the exact center of the upper surface of the electromagnet, and the structural center of the sealing fixture and the structural center of the metal tube shell are connected in sequence above the mark, so that the structural center and the magnetic center of the sealing sample can be easily aligned during the sealing process, so that the tube shell and the cover plate of the sealing sample can be self-aligned to avoid the position deviation of the tube shell and the cover plate due to uneven magnetization.

[0028] (4) In one example, an adjustable power supply is externally connected to the terminals of the positive lead of the electromagnet and the negative lead of the electromagnet. For covers and shells of different sizes, the magnitude of the magnetic force between the cover and the shell can be controlled by changing the current of the electromagnet. Different current parameters are selected according to the actual situation of the sealing sample, which can improve the control of the entire sealing process and make the sealing process more reliable.

[0029] (5) In one example, the carrier can effectively improve the quality level of parallel welding, especially the packaging of small-sized metal tube shells (less than 5*5 mm). It is suitable for parallel welding packaging of metal ceramic tube shells made of paramagnetic materials such as Kovar. When using this parallel welding carrier, there is no need to use an additional visual alignment system or mechanical alignment system. The cost of using this carrier is estimated to be less than 10,000 yuan, which is much lower than the visual alignment system of more than 200,000 yuan. In addition, during the parallel welding process, the vibration generated by the mechanical alignment system during machining can be avoided, thereby ensuring the parallel welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A parallel welding side view of a parallel welding carrier shown in an embodiment of the utility model;

[0031] Figure 2 A side view of a sealing and welding carrier frame and an electromagnet assembly shown in an embodiment of the utility model;

[0032] Figure 3 A top view of a sealing and welding carrier frame and an electromagnet assembly shown in an embodiment of the utility model;

[0033] Figure 4 A schematic side view of the electromagnet electrode connection and the sealing cover of the sealing welding carrier shown in an embodiment of the utility model;

[0034] Figure 5 It is a top view schematic diagram of the electromagnet electrode connection and the sealing cover of the sealing welding carrier shown in an embodiment of the utility model.

[0035] Numbers in the figure: 1-carrier frame; 2-electromagnet group; 3-positive pole of electromagnet group; 4-negative pole of electromagnet group; 5-sealing fixture; 6-metal tube shell; 7-metal cover plate; 8-positive lead of electromagnet; 9-negative lead of electromagnet; 10-label. DETAILED DESCRIPTION

[0036] The technical solution of the utility model is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are directions or positional relationships based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Reference Figure 1 Figure 5 In an exemplary embodiment, a parallel welding carrier is provided, comprising:

[0041] Carrier frame 1;

[0042] A plurality of electromagnet groups 2 installed in the carrier frame 1;

[0043] A positive and negative lead circuit board (not shown in the figure), which is mounted on the carrier frame 1 between the electromagnet groups 2, and is connected to the positive electrode 3 of the electromagnet group through the electromagnet positive lead 8, and is connected to the negative electrode 4 of the electromagnet group through the electromagnet negative lead 9;

[0044] A sealing welding fixture 5 is arranged on the carrier frame 1, and a plurality of metal tube shell mounting structures are arranged on the sealing welding fixture 5 correspondingly to the metal tube shell mounting structures arranged directly above the electromagnet group 2;

[0045] A metal tube shell 6, which is fixed in the metal tube shell mounting structure and connected to the electromagnet group 2; and

[0046] A metal cover plate 7 is correspondingly arranged on the metal tube shell 6 .

[0047] Specifically, when the carrier is in use, the electromagnet carrier is installed on a parallel welding workbench. First, the welding fixture 5 needs to be placed on the carrier frame 1. The purpose is to fix the welding sample and prevent the metal tube shell 6 from being displaced during the welding process. Secondly, the welded sample is placed in the welding fixture 5. Before welding, a certain current needs to be applied to the electromagnet so that the electromagnet generates magnetic force, so that the metal cover plate 7 and the metal tube shell 6 placed on the carrier frame 1 are magnetized under the action of the magnetic force, and the metal cover plate 7 and the metal tube shell 6 attract each other, that is, they can be self-aligned, so there is no need to use an optical alignment system for alignment. In addition, the metal cover plate 7 and the metal tube shell 6 attract each other under the action of the magnetic force, which is equivalent to using a pressure needle / pressure rod to apply downward pressure to the cover plate, so a pressure needle / pressure rod is no longer needed, which saves space for welding, so welding of small-sized shells can be achieved.

[0048] Furthermore, a metal material such as stainless steel, aluminum or copper is used to make the frame structure of the sealing carrier, and then an electromagnet is installed in the carrier frame 1 to form an electromagnet group 2, and the positive and negative lead circuit boards of the electromagnet are installed in the empty space between the electromagnet groups 2. Figure 2 and Figure 3 As shown in the schematic diagram.

[0049] In one example, referring to Figure 5 , a mark 10 is provided at the center of the upper surface of the electromagnet in the electromagnet group 2, and the structural center of the sealing fixture 6 and the structural center of the metal tube shell 7 are connected in sequence above the mark 10. Specifically, the mark is a cross, and the center of each electromagnet is shown as a "cross" mark. In the sealing process, the structural center of the sealing sample and the magnetic center need to be coincident, so that the metal cover plate 7 and the metal tube shell 6 of the sealing sample can be self-aligned, otherwise the position of the metal cover plate 7 and the metal tube shell 6 will be offset due to uneven magnetization.

[0050] In one example, the metal cover plate 7 and the metal tube shell 6 are both made of Kovar alloy material, which has paramagnetism, and is more conducive to the mutual attraction and alignment between the cover plate and the tube shell.

[0051] In one example, the terminals of the electromagnet positive lead and the electromagnet negative lead are externally connected to an adjustable power supply. Specifically, for metal cover plates 7 and metal tube shells 6 of different sizes, different current parameters can be selected according to the actual situation of the welding sample, and the magnitude of the magnetic force between the cover plate and the shell can be controlled by changing the current of the electromagnet, thereby improving the control strength of the entire welding process and making the welding process more reliable.

[0052] In one example, the electromagnets in the electromagnet group 2 are all in the shape of long strips, the size of the electromagnets is less than 3*3 cm, and the size of the metal tube shell is less than 5*5 mm.

[0053] This carrier can effectively improve the quality level of parallel welding, especially for the packaging of small-sized metal shells (less than 5*5 mm). It is suitable for the parallel welding packaging of metal ceramic shells made of paramagnetic materials such as Kovar. When using this parallel welding carrier, there is no need to use an additional visual alignment system or mechanical alignment system. The cost of using this carrier is estimated to be less than 10,000 yuan, which is much lower than the visual alignment system of more than 200,000 yuan. In addition, during the parallel welding process, the vibration caused by mechanical processing can be avoided, ensuring the parallel welding effect.

[0054] The above specific implementation methods are detailed descriptions of the present utility model. It cannot be determined that the specific implementation methods of the present utility model are limited to these descriptions. For ordinary technicians in the technical field to which the present utility model belongs, they can make several simple deductions and substitutions without departing from the concept of the present utility model, which should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A parallel sealing carrier, characterized in that: include: Carrier frame; a plurality of electromagnet groups mounted in the carrier frame; A positive and negative lead circuit board, which is mounted on the carrier frame between the electromagnet groups and connected to the positive pole of the electromagnet group through the electromagnet positive lead and connected to the negative pole of the electromagnet group through the electromagnet negative lead; A sealing welding fixture is arranged on the carrier frame, and a plurality of metal tube shell mounting structures are arranged on the sealing welding fixture corresponding to the metal tube shell mounting structures arranged directly above the electromagnet group; A metal tube shell, which is fixed in the metal tube shell mounting structure and connected to the electromagnet group; as well as A metal cover plate is correspondingly arranged on the metal tube shell.

2. A parallel sealing carrier according to claim 1, characterized in that: A mark is provided at the center of the upper surface of the electromagnet in the electromagnet group, and the structure center of the sealing and welding fixture and the structure center of the metal tube shell are connected in sequence above the mark.

3. A parallel sealing and welding carrier according to claim 2, characterized in that: The mark is in the shape of a cross.

4. A parallel sealing carrier according to claim 1, characterized in that: The carrier frame is a stainless steel frame, an aluminum frame or a copper frame.

5. The parallel sealing carrier according to claim 1, characterized in that: The metal tube shell is a Kovar alloy tube shell.

6. A parallel sealing carrier according to claim 5, characterized in that: The metal cover plate is a Kovar alloy cover plate.

7. The parallel sealing carrier according to claim 1, characterized in that: The terminals of the electromagnet positive lead and the electromagnet negative lead are externally connected to an adjustable power supply.

8. The parallel sealing carrier according to claim 1, characterized in that: The electromagnets in the electromagnet group are all in the shape of long strips.

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