Laser sealing welding process for narrow partition wall and cover plate of aluminum box body and aluminum box body

Abstract

The present application relates to a laser sealing and welding process for the narrow partition wall and cover plate of an aluminum box body and an aluminum box body, which belongs to the field of laser welding technology and solves the problem that the existing technology cannot achieve sealing and welding of narrow partition walls and cover plates. The laser sealing and welding process for the narrow partition wall and cover plate of an aluminum box body includes the following steps: milling an edge on the top surface of the outer wall of the aluminum box body so that the height of the edge is lower than the predetermined distance of the top of the narrow partition wall in the aluminum box body; milling a groove on the lower surface of the cover plate of the aluminum box body that can accommodate the top of the narrow partition wall, and the groove depth of the groove is greater than or equal to the predetermined distance; installing the cover plate with the groove on the edge of the top surface of the outer wall, and the groove is sleeved on the top of the narrow partition wall; using laser to directly irradiate the position of the upper surface of the cover plate corresponding to the groove, and welding and fixing the top of the narrow partition wall to the cover plate; using laser to weld the gap at the edge of the cover plate, and welding and fixing the cover plate to the outer wall. The present application achieves sealing and welding of narrow partition walls and cover plates.

Description

Technical Field

[0001] The present application belongs to the field of laser welding technology, and specifically relates to a laser sealing welding process for a narrow partition wall and a cover plate of an aluminum box body and an aluminum box body. Background Art

[0002] In the field of high-end electronic components such as semiconductors, some products require partition walls inside the metal box to separate multiple cavities, and each cavity is sealed and cannot be connected to each other, otherwise crosstalk will occur and affect product performance.

[0003] Due to the limited energy of the laser, the thickness of the metal box that can be melted is limited. The current laser sealing solution is: mill an edge on the outer wall of the box, and the top of the partition wall inside the box is milled off as a whole. The width of the edge is smaller than the width of the outer wall. The edge can also be understood as a step surface. The top surface of the milled partition wall in the box is flush with the plane where the edge / step surface is located. The cover plate is placed on this edge to play a role in positioning. The laser on the front is used to weld the gap at the edge of the cover plate to achieve sealing of the cover plate.

[0004] However, some products have a small overall size of metal box, and narrow partition walls are used to separate the internal space of the box to ensure that the separated cavity is large enough. Since the narrow partition wall is too narrow, it is impossible to partially mill the edge, and it can only be completely milled off to the same height as other wall edges. During welding, the middle narrow partition wall cannot be covered for laser sealing, which will result in the cover plate and the narrow partition wall not being welded together. Due to processing errors and stress, there will be a small gap between the cover plate and the narrow partition wall, and then crosstalk will occur between the two cavities, affecting the normal function of the product. Summary of the invention

[0005] In view of the above analysis, an embodiment of the present invention aims to provide a laser sealing and welding process for narrow partition walls and cover plates of an aluminum box body, so as to solve the problem that the prior art cannot achieve sealing and welding of narrow partition walls and cover plates.

[0006] The object of the present invention is achieved in that:

[0007] On the one hand, a laser sealing and welding process for a narrow partition wall and a cover plate of an aluminum box body is provided, comprising the following steps:

[0008] Milling an edge on the top surface of the outer wall of the aluminum box body so that the height of the edge is lower than the predetermined distance of the top of the narrow partition wall inside the aluminum box body;

[0009] A groove capable of accommodating the top of the narrow partition wall is milled on the lower surface of the cover plate of the aluminum box body, and the groove depth of the groove is greater than or equal to the predetermined distance;

[0010] Install the cover plate with the groove milled on the edge of the top surface of the external wall, and the groove is set on the top of the narrow partition wall;

[0011] The top of the narrow partition wall is welded to the cover plate by directly irradiating the position corresponding to the groove on the upper surface of the cover plate with a laser; the gap at the edge of the cover plate is welded to the cover plate and fixed to the outer wall with a laser; wherein the width of the narrow partition wall is greater than 1 mm;

[0012] During laser welding, the spot diameter d, pulse frequency f and welding speed s satisfy the following relationship:

[0013] f = 4s / d;

[0014] Laser peak power P and pulse width t satisfy the following relationship:

[0015] P=500×[(T+0.2) / 0.6], t=2×[(T+0.2) / 0.6].

[0016] Furthermore, before installing the cover plate with the groove on the edge of the top surface of the outer wall, a layer of aluminum foil is placed on the top surface of the narrow partition wall, and then the cover plate is placed on the edge of the outer wall, and a pressure block is used to press the cover plate downward to deform the aluminum foil to fill the gap between the top surface of the narrow wall and the bottom of the groove.

[0017] Furthermore, a gap between the bottom surface of the groove and the top surface of the narrow partition wall is smaller than the thickness of the aluminum foil.

[0018] Furthermore, the thickness of the aluminum foil is 0.1 mm.

[0019] Furthermore, the difference between the groove width of the groove and the wall width of the narrow partition wall is less than or equal to 0.1 mm.

[0020] Furthermore, the width of the narrow partition wall is 1-3 mm.

[0021] Further, when the laser is irradiated on the cover plate and the panel for welding, a molten pool is formed;

[0022] The depth H of the molten pool is greater than the thickness T of the cover plate where the groove is set, and the width of the molten pool at the narrow partition wall is less than the width N of the narrow partition wall.

[0023] Furthermore, HT>0.3mm; T>0.4mm.

[0024] On the other hand, an aluminum box body is provided, comprising an outer wall and a cover plate, wherein the outer wall encloses an internal space of the aluminum box body, and at least one narrow partition wall is provided inside the aluminum box body, and the narrow partition wall divides the internal space of the aluminum box body into a plurality of cavities; wherein the narrow partition wall and the cover plate are sealed and welded using the above-mentioned laser sealing welding process for the narrow partition wall and the cover plate of the aluminum box body, and the cavities after welding are not connected to each other.

[0025] Compared with the prior art, the laser sealing and welding process for the narrow partition wall and cover plate of the aluminum box body and the aluminum box body provided by the present invention stretches the narrow partition wall to increase its height, mills a groove at the corresponding position of the cover plate, pads the groove with aluminum foil, and then presses the cover plate with a pressing block during laser sealing and welding, and then welds the cover plate. There is no gap between the cover plate and the narrow wall, so that the two cavities achieve the effect of complete electromagnetic isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the cross-sectional structure of the cover plate of the aluminum box body provided by the present invention;

[0028] Figure 2 A schematic diagram of a partial cross-sectional structure of the outer wall and inner partition wall of the aluminum box body provided by the present invention;

[0029] Figure 3 The partial cross-sectional structure of the aluminum box provided by the present invention is shown in FIG. Figure 1 ;

[0030] Figure 4 The partial cross-sectional structure of the aluminum box provided by the present invention is shown in FIG. Figure 2 ;

[0031] Figure 5 A schematic diagram of the laser sealing welding state of the narrow partition wall and the cover plate of the aluminum box body provided by the present invention;

[0032] Figure 6 This is a flow chart of the algorithm of laser sealing process parameters for the narrow partition wall and cover plate of the aluminum box body provided by the present invention.

[0033] Reference numerals:

[0034] 1. External wall; 11. Edge;

[0035] 2. Narrow partition wall;

[0036] 3. Cover plate; 31. Groove;

[0037] 4. Aluminum foil;

[0038] 5. Briquetting. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] In the accompanying drawings, the size and relative size of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, a specific process sequence may be performed in a different order than described. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the order described. In addition, the same reference numerals represent the same components.

[0041] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0042] Example 1

[0043] A specific embodiment of the present invention, as Figures 1 to 4 As shown, a laser sealing welding process for a narrow partition wall and a cover plate of an aluminum box body is disclosed, comprising the following steps:

[0044] An edge 11 is milled out of the top surface of the outer wall 1 of the aluminum box body, so that the height of the edge 11 is lower than the predetermined distance of the top of the narrow partition wall 2 in the aluminum box body;

[0045] A groove 31 capable of accommodating the top of the narrow partition wall 2 is milled on the lower surface of the cover plate 3 of the aluminum box body, and the groove depth of the groove 31 is greater than or equal to the predetermined distance;

[0046] The cover plate 3 with the groove 31 milled thereon is installed on the edge 11 of the top surface of the outer wall 1, and the groove 31 is sleeved on the top of the narrow partition wall 2;

[0047] The position corresponding to the groove 31 on the upper surface of the cover plate 3 is directly irradiated with laser, and the top of the narrow partition wall 2 is welded to the cover plate 3; the gap at the edge of the cover plate 3 is welded to the cover plate 3 and the outer wall 1 is welded.

[0048] Preferably, the groove depth of the groove 31 is greater than the predetermined distance. When the cover plate 3 is installed on the edge 11 of the top surface of the external wall 1, there is a gap between the bottom surface of the groove 31 and the top surface of the narrow partition wall 2, and the two are not in direct contact. A layer of aluminum foil 4 is pre-laid in this gap, which is helpful for welding. The specific operation steps are: before installing the cover plate 3 with the groove 31 on the edge 11 of the top surface of the external wall 1, first place a layer of aluminum foil 4 on the top surface of the narrow partition wall 2, then place the cover plate 3 on the edge 11 of the external wall 1, and use the pressing block 5 to press the cover plate 3 downward, so that the aluminum foil 4 is deformed to fill the gap between the top surface of the narrow wall and the bottom of the groove 31.

[0049] In one preferred embodiment, the gap between the bottom surface of the groove 31 and the top surface of the narrow partition wall 2 is smaller than the thickness of the aluminum foil 4. Exemplarily, the gap between the bottom surface of the groove 31 and the top surface of the narrow partition wall 2 is less than 0.1 mm, and the thickness of the aluminum foil 4 is 0.1 mm. Since the aluminum foil 4 has good ductility, the aluminum foil 4 is deformed by the extrusion of the pressing block 5 to fill the gap between the partition wall and the narrow wall, thereby helping welding.

[0050] In this embodiment, the height of the narrow partition wall 2 is greater than the height of the upper edge 11 of the outer wall 1, and the depth of the groove 31 is greater than or equal to the height difference between the top of the narrow partition wall 2 and the edge 11, and this height difference is the predetermined distance.

[0051] In this embodiment, the groove width of the groove 31 is greater than the wall width of the narrow partition wall 2, but if the gap between the narrow partition wall 2 and the groove wall of the groove 31 is too large, the melt will be introduced into the cavity separated by the narrow partition wall 2. Therefore, in order to prevent the melt from falling into the cavity, the difference between the groove width of the groove 31 and the wall width of the narrow partition wall 2 is less than or equal to 0.1 mm.

[0052] When the laser is irradiated on the upper panel of the cover plate 3 for welding, a molten pool will be formed. The molten pool is in the shape of an inverted truncated cone as a whole, and the longitudinal section is an isosceles trapezoid. Since the thickness of the cover plate 3 where the groove 31 is set is thinner, the thickness here is T, and the laser energy can directly melt through. The laser directly irradiates the upper surface of the cover plate 3 at the narrow partition wall 2 and can directly perform welding. Figure 5As shown, H is the depth of the molten pool, T is the thickness of the cover plate 3 where the groove 31 is set, that is, the distance from the upper surface of the cover plate 3 to the bottom surface of the groove 31 is T, and N is the width of the narrow partition wall 2. In this embodiment, the narrow partition wall 2 refers to a partition wall with a width of 1-3 mm.

[0053] In order to ensure good welding, the molten pool depth H is greater than T, and the width of the molten pool at the narrow partition wall 2 is less than N, that is, the width at the intersection of the top surface of the narrow partition wall 2 and the molten pool is less than N.

[0054] Laser welding process parameters include spot diameter d, laser peak power P, pulse width t (pulse width), pulse frequency f and welding speed s.

[0055] For example, in a normal pure aluminum metal scenario, that is, the narrow partition wall 2, the cover plate 3, and the aluminum foil 4 are all pure aluminum, the laser parameters are: the spot diameter d is 1.0 mm, the laser peak power P is 500 W, the pulse width t is 2.0 ms, and the effective molten pool depth H is 0.6 mm.

[0056] The laser sealing welding process of the narrow partition wall and cover plate of the aluminum box provided in this embodiment is suitable for partition walls with a width of 1-3 mm. In the narrow partition wall scenario, the depth of the molten pool must penetrate into the top surface of the partition wall by more than 0.2 mm. Optionally, if aluminum foil 4 is provided, HT>0.3 mm; T is greater than 0.4 mm.

[0057] In this embodiment, in order to ensure the welding quality, the distance between the centers of two adjacent light spots is a, then a=d / 4, the interval time between the two light spots is t=a / s, s is the welding speed, and the pulse frequency f=1 / t;

[0058] Then the pulse frequency f (unit Hz), welding speed s (unit m / s) and spot diameter d (unit m) satisfy the following relationship:

[0059] f = 4s / d;

[0060] For example, the spot diameter d=0.001 m is used, and f=4000 s. As long as the process parameters of pulse frequency f and welding speed s satisfy the above formula, it will be fine.

[0061] Then the laser peak power P = 500 × [(T + 0.2) / 0.6], pulse width t = 2 × [(T + 0.2) / 0.6]. The laser peak power and pulse width algorithm flow is as follows Figure 6 shown.

[0062] Compared with the prior art, the laser sealing and welding process for the narrow partition wall and cover plate of the aluminum box body provided in this embodiment is achieved by stretching the narrow partition wall to increase its height, milling a groove at the corresponding position of the cover plate, padding the groove with aluminum foil, and then pressing the cover plate with a pressing block during laser sealing and welding, and then welding is performed. There is no gap between the cover plate and the narrow wall, so that the two cavities achieve the effect of complete electromagnetic isolation.

[0063] Example 2

[0064] A specific embodiment of the present invention, as Figures 1 to 4 As shown, an aluminum box body is disclosed, which has an outer wall 1 and a cover plate 3. The outer wall 1 encloses the internal space of the aluminum box body. At least one narrow partition wall 2 is provided inside the aluminum box body. The narrow partition wall 2 divides the internal space of the aluminum box body into multiple cavities; the narrow partition wall 2 and the cover plate 3 are sealed and welded using the narrow partition wall and cover plate laser sealing welding process of the aluminum box body in Example 1, and the cavities after welding are not connected to each other.

[0065] The height of the narrow partition wall 2 is greater than the height of the upper edge 11 of the outer wall 1 , and a groove 31 is provided on the lower surface of the cover plate 3 , the depth of the groove 31 is greater than or equal to the height difference between the top of the narrow partition wall 2 and the upper edge 11 of the outer wall 1 .

[0066] Preferably, an aluminum foil 4 is laid between the top of the narrow partition wall 2 and the bottom of the groove 31. Exemplarily, the gap between the bottom surface of the groove 31 and the top surface of the narrow partition wall 2 is less than 0.1 mm, and the thickness of the aluminum foil 4 is 0.1 mm.

[0067] Preferably, the difference between the groove width of the groove 31 and the wall width of the narrow partition wall 2 is less than or equal to 0.1 mm.

[0068] Compared with the prior art, the aluminum box body provided in this embodiment essentially has similar technical effects as the laser sealing process in Example 1, and will not be described in detail here.

[0069] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A laser sealing process for narrow partition walls and cover plates of an aluminum box, characterized in that: The steps include: Milling an edge on the top surface of the outer wall of the aluminum box body so that the height of the edge is lower than the predetermined distance of the top of the narrow partition wall inside the aluminum box body; A groove capable of accommodating the top of the narrow partition wall is milled on the lower surface of the cover plate of the aluminum box body, and the groove depth of the groove is greater than or equal to the predetermined distance; Install the cover plate with the groove milled on the edge of the top surface of the external wall, and the groove is set on the top of the narrow partition wall; Use laser to directly illuminate the position of the corresponding groove on the upper surface of the cover plate, and weld the top of the narrow partition wall to the cover plate; use laser to weld the gap at the edge of the cover plate, and weld the cover plate to the outer wall; Wherein, the width of the narrow partition wall is greater than 1 mm; During laser welding, the spot diameter d, pulse frequency f and welding speed s satisfy the following relationship: f = 4s / d; Laser peak power P and pulse width t satisfy the following relationship: P=500×[(T+0.2) / 0.6], t=2×[(T+0.2) / 0.6]; Before installing the cover plate with the groove on the edge of the top surface of the external wall, place a layer of aluminum foil on the top surface of the narrow partition wall, then place the cover plate on the edge of the external wall, and use a pressing block to press the cover plate downward to deform the aluminum foil to fill the gap between the top surface of the narrow wall and the bottom of the groove; The gap between the bottom surface of the groove and the top surface of the narrow partition wall is smaller than the thickness of the aluminum foil; The thickness of the aluminum foil is 0.1 mm; When the laser is irradiated on the cover plate and the panel for welding, a molten pool is formed; The depth H of the molten pool is greater than the thickness T of the cover plate where the groove is set, and the width of the molten pool at the narrow partition wall is less than the width N of the narrow partition wall; HT>0.3mm;T>0.4mm.

2. The laser sealing and welding process for the narrow partition wall and cover plate of the aluminum box body according to claim 1 is characterized in that: The difference between the groove width of the groove and the wall width of the narrow partition wall is less than or equal to 0.1 mm.

3. The laser sealing and welding process for the narrow partition wall and cover plate of the aluminum box body according to claim 1 is characterized in that: The width of the narrow partition wall is 1-3 mm.

4. An aluminum box body, characterized in that: The aluminum box body has an outer wall and a cover plate, wherein the outer wall encloses the inner space of the aluminum box body, and the inner space of the aluminum box body is provided with at least one narrow partition wall, and the narrow partition wall divides the inner space of the aluminum box body into a plurality of cavities; The narrow partition wall and the cover plate are sealed and welded by using the narrow partition wall and cover plate laser sealing welding process of the aluminum box body according to any one of claims 1 to 3, and the cavities after welding are not connected to each other.

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