Welding jig for power module copper-clad ceramic substrate (DBC)

Abstract

The invention relates to the technical field of welding jigs, and provides a welding jig for a power module copper-clad ceramic substrate (DBC), which is simple in structure, capable of simultaneously welding passive devices on a plurality of DBCs, higher in production efficiency, more uniform in heat conduction and capable of well reducing the problems of solder layer cavities, DBC warping and the like. The welding process quality of the power module is greatly improved, the matched jig structure forms an operation control structure, the operation convenience is higher, the functionality is higher, the jig is more practical, the jig comprises a jig body and a bearing base table, and the jig body comprises an upper cover plate, a lower cover plate, a positioning plate, a copper-clad ceramic substrate, a bottom supporting plate, a large pressing block and a small pressing block. The large pressing block and the small pressing block are both installed on the lower cover plate, a plurality of DBC positioning grooves and four bottom plate bolt through holes are formed in the bottom supporting plate, the plurality of DBC positioning grooves are all used for auxiliary positioning of the copper-clad ceramic substrate, two positioning bosses are arranged on the positioning plate, and two lower cover positioning grooves and a plurality of pressing block positioning holes are formed in the lower cover plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding jigs, in particular to a welding jig for a copper-clad ceramic substrate (DBC) of a power module. BACKGROUND

[0002] Through research, the power module, as a core component of electric energy conversion and control, accounts for a large proportion in the reliability problem of the power module. The solder layer failure in the packaging process accounts for 34% of the electric energy conversion system. In addition, problems such as solder splashing, solder voids and solder layer cracks are easily formed in the welding process, and after reflow, the copper-clad ceramic substrate (DBC) of the module will produce a large residual stress and warping. The above phenomena will reduce the welding process quality and affect the module reliability and service life. In order to improve the welding quality of the copper-clad ceramic substrate of the power module, we propose a welding jig for a copper-clad ceramic substrate (DBC) of a power module.

[0003] Through retrieval, the patent with the Chinese patent application number CN202220145808.9 discloses a guide jig and guide device, which is roughly described as including a first body and a second body, the first body including a first base and at least one first guide portion, the first guide portion having a first guide surface, the second body having a receiving space between the first body and the second body, the receiving space being used for placing a copper-clad ceramic plate, the first guide portion extending from the first base to the second body, and the first guide surface being used for contacting and guiding the copper-clad ceramic plate to descend. The patent with the Chinese patent application number CN202122339294.9 discloses a device for ceramic sheet welding, which is roughly described as including a base, a support, a first slide rail, a second slide rail, a resistance welding base, a resistance welding head, a temperature control module, a nitrogen outlet, the base upper surface being provided with the first slide rail, the first slide rail being slidably connected with a moving plate, the moving plate front side being installed with a jig and a welding platform, the moving plate side being electrically connected with a transmission module, the transmission module being connected with the resistance welding base, the resistance welding base bottom being provided with the resistance welding head, the resistance welding head surface being electrically connected with the temperature control module, and the resistance welding base bottom being further provided with the nitrogen outlet. When in use, the temperature control module can rapidly heat the resistance welding head for convenient welding, and the moving plate can be moved to a position after the start button is started and then automatically reset.

[0004] The core of the former of the above two prior art solutions is a guide jig, which only includes a single guide structure, and the target part for guiding and limiting is relatively single in actual application, and the mutual molding and separation operation between the first main body and the second main body involves less, and the core of the latter is a welding functional component, and the introduction of the corresponding jig is relatively simple, so both of them need to be further enriched in functionality, and in the welding process, since the reflow welding adopts a bottom support plate heating form, the uneven heat conduction of the traditional welding jig easily causes virtual welding and solder layer cavities, in addition, the size of the chip and the passive device such as resistor is small, and the weight is light, which is easily affected by the soldering furnace hot air in the welding process, causing the position to deviate, and further increasing the parasitic inductance and parasitic capacitance of the module, which seriously affects the dynamic and static parameters of the module, and the traditional jig does not consider using a pressing block to keep the chip and the DBC tightly attached, or using the weight of the jig to press on the upper surface of the passive device, which will cause serious tin overflow. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a welding jig for a power module copper-clad ceramic substrate (DBC), which has a simple jig structure, can simultaneously weld passive devices on multiple DBCs, greatly increasing production efficiency, and the tight attachment of each part in the jig body ensures the accuracy of the relative position of the DBC welding copper layer passive device and the solder pad, the jig body conducts heat more evenly during the welding process, which can better reduce solder layer cavities and DBC warping and other problems, greatly improving the welding process quality of the power module, and the supporting jig structure forms a structure for operation control, which is more convenient to operate, has stronger functionality and is more practical.

[0006] To achieve the above object, the present application provides the following technical solution: a welding jig for a power module copper-clad ceramic substrate (DBC), comprising a jig body and a copper-clad ceramic substrate, further comprising a bearing base, the jig body comprising an upper cover plate, a lower cover plate, a positioning plate, a bottom support plate, a large pressing block and a small pressing block, the large pressing block and the small pressing block are both installed on the lower cover plate, the bottom support plate is provided with a plurality of DBC positioning grooves and four bottom plate bolt through holes, the plurality of DBC positioning grooves are used for auxiliary positioning of the copper-clad ceramic substrate, the positioning plate is provided with two positioning bosses, the lower cover plate is provided with two lower cover positioning grooves and a plurality of pressing block positioning holes, the upper cover plate is provided with two upper cover positioning grooves, the two lower cover positioning grooves are matched with the two positioning bosses respectively, and the two upper cover positioning grooves are matched with the two positioning bosses respectively, the upper cover plate, the lower cover plate and the positioning plate are installed on the bearing base through a driving assembly, and the bottom support plate is installed on the bearing base through a vertical support.

[0007] Preferably, the active driving assembly comprises a rear conveying belt and a track adjusting frame, the rear conveying belt is installed on the bearing base, the track adjusting frame is connected with the vertical support, three progressive support plates are fixedly connected outside the rear conveying belt, three progressive clamping frames are connected with the progressive support plates through elastic assemblies, three inner sleeves are rotatably connected in the progressive clamping frames, three transmission columns are fixedly connected in the inner sleeves, the three transmission columns are matched with the track adjusting frame, an upper connecting frame, a lower connecting frame and a positioning connecting frame are fixedly connected outside the three inner sleeves, and the upper connecting frame, the lower connecting frame and the positioning connecting frame are fixedly connected with the upper cover plate, the lower cover plate and the positioning plate respectively.

[0008] Preferably, the track adjusting frame is provided with a lower horizontal track and an upper vertical track, the lower horizontal track and the upper vertical track are communicated through a torsion track, and the lower horizontal track, the upper vertical track and the torsion track are matched with the transmission column.

[0009] Preferably, the three progressive clamping frames respectively comprise a first slot frame, a second slot frame and a third slot frame, the first slot frame, the second slot frame and the third slot frame are sequentially arranged from top to bottom, the first slot frame, the second slot frame and the third slot frame are fixedly connected with a first pressing frame, a second pressing frame and a third pressing frame respectively, and the first slot frame, the second slot frame, the third slot frame, the first pressing frame, the second pressing frame and the third pressing frame are all provided with a half-ring groove matched with the inner sleeve.

[0010] Preferably, a first guide sleeve is fixedly connected between the first slot frame and the first pressing frame, a second guide sleeve is fixedly connected between the second slot frame and the second pressing frame, a third guide sleeve is fixedly connected between the third slot frame and the third pressing frame, a first guide prism, a second guide prism and a third guide prism are slidably connected with the first guide sleeve, the second guide sleeve and the third guide sleeve respectively, the first guide prism, the second guide prism and the third guide prism are fixedly connected with the three progressive support plates respectively, a first sleeve spring, a second sleeve spring and a third sleeve spring are fixedly connected on the three progressive support plates respectively, the first sleeve spring, the second sleeve spring and the third sleeve spring are sleeved outside the first guide prism, the second guide prism and the third guide prism respectively, and the first sleeve spring, the second sleeve spring and the third sleeve spring are fixedly connected with the first guide sleeve, the second guide sleeve and the third guide sleeve respectively.

[0011] Preferably, a fixed edge frame is fixedly connected on the bearing base, an assembly edge frame is installed on the bearing base, a driving pulley and a transmission pulley are rotatably installed on the fixed edge frame, the rear conveying belt is drivingly connected between the driving pulley and the transmission pulley, a servo motor is installed outside the fixed edge frame, an output shaft of the servo motor is drivingly connected with the driving pulley, and two rotating mounting holes are arranged on the assembly edge frame and matched with the driving pulley and the transmission pulley respectively.

[0012] Preferably, the bearing base is fixedly connected with a rail frame, the assembled side frame is provided with a rail sleeve matched with the rail frame, a plurality of threaded holes are formed in the rail sleeve, and a positioning bolt for pressing and positioning the rail sleeve relative to the rail frame is threadedly connected in each threaded hole.

[0013] Preferably, the top end of the vertical support is provided with a supporting frame, the supporting frame is fixedly connected with a mounting groove plate through a pressing bolt, four internal hexagonal bolts are arranged in the four bottom plate bolt through holes, the four internal hexagonal bolts are threadedly connected with the mounting groove plate, a plug-in support is fixedly connected to the rear side of the supporting frame, a loading hole for inserting the rail adjusting frame is formed in the plug-in support, and an external assembly frame is fixedly connected to the right end of the supporting frame.

[0014] Preferably, the bearing base is fixedly connected with a middle support, the middle support is provided with a bottom plug-in positioning groove and a top plug-in positioning hole, the bottom plug-in positioning groove and the top plug-in positioning hole are matched with the rail adjusting frame, and the top plug-in positioning hole is provided with a screw hole in which a pressing bolt matched with the rail adjusting frame is arranged.

[0015] Preferably, the positioning plate is provided with two positioning bolt through holes, the lower cover plate is provided with two lower cover bolt through holes, the upper cover plate is provided with two upper cover bolt through holes, a positioning pressing bolt matched with the positioning connecting frame is threadedly connected in the positioning bolt through hole, an upper pressing bolt matched with the upper connecting frame is threadedly connected in the upper cover bolt through hole, and a lower pressing bolt matched with the lower connecting frame is threadedly connected in the lower cover bolt through hole.

[0016] Compared with the prior art, the present application provides a welding jig for a power module copper-clad ceramic substrate (DBC), which has the following advantages: (1) In the present application, the jig body is designed to form a corresponding welding jig matched with the power module copper-clad ceramic substrate. The structure is simple, and multiple DBCs can be simultaneously welded, greatly increasing the production efficiency. The close fit between the parts in the jig body ensures the accuracy of the relative position of the DBC copper layer passive device and the solder pad, the heat conduction of the jig body is more uniform during the welding process, which can better reduce the problems of solder layer cavities and DBC warping, greatly improving the welding process quality of the power module.

[0017] (2) In the present application, the upper cover plate, the lower cover plate and the positioning plate in the jig body are designed to form a matching installation and power operation structure, which can realize the corresponding installation of the jig body relative to the bottom support plate, and also facilitate the opening and closing drive control of the jig body, with higher operation convenience and stronger functionality, and is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the overall structure of the present application; Figure 2 is a schematic view of the overall structure of the present application; Figure 1 is a schematic view of the overall structure of the present application; Figure 3 is a schematic view of the overall structure of the present application; Figure 4 is a schematic view of the overall structure of the present application; Figure 5 is a schematic view of the overall structure of the present application; Figure 6 is a schematic view of the overall structure of the present application; Figure 7 is a schematic view of the overall structure of the present application; Figure 8 is a schematic view of the overall structure of the present application; Figure 9 is a schematic view of the overall structure of the present application; Figure 10 is a schematic view of the overall structure of the present application; Figure 9 is a schematic view of the overall structure of the present application; Figure 11 is a schematic view of the overall structure of the present application; Figure 12 is a schematic view of the overall structure of the present application; Figure 11 is a schematic view of the overall structure of the present application; Figure 13 is a schematic view of the overall structure of the present application; Figure 14 is a schematic view of the overall structure of the present application; Figure 13 is a schematic view of the overall structure of the present application; Figure 15 is a schematic view of the overall structure of the present application.

[0019] In the figure: 1, upper cover plate; 2, large pressing block; 3, small pressing block; 4, lower cover plate; 5, positioning plate; 6, copper clad ceramic substrate; 7, bottom support plate; 8, DBC positioning groove; 9, bottom plate bolt through hole; 10, positioning bolt through hole; 11, positioning boss; 12, lower cover bolt through hole; 13, lower cover positioning groove; 14, pressing block positioning hole; 15, upper cover bolt through hole; 16, upper cover positioning groove; 17, bearing base; 18, vertical support; 19, rear conveying belt; 20, track adjusting frame; 21, stepped support plate; 22, inner bushing; 23, transmission column; 24, upper connecting frame; 25, lower connecting frame; 26, positioning connecting frame; 27, lower horizontal track; 28, upper vertical track; 29, torsion track; 30, first level groove frame; 31, second level groove frame; 32, third level groove frame; 33, first level pressing frame; 34, second level pressing frame; 35, third level pressing frame; 36, half ring groove; 37, first level guide sleeve; 38, second level guide sleeve; 39, third level guide sleeve; 40, first level guide prism; 41, second level guide prism; 42, third level guide prism; 43, first level sleeve spring; 44, second level sleeve spring; 45, third level sleeve spring; 46, fixed edge frame; 47, assembled edge frame; 48, drive pulley; 49, transmission pulley; 50, servo motor; 51, rotating support hole; 52, track frame; 53, track sleeve; 54, positioning bolt; 55, support frame; 56, mounting groove plate; 57, insertion support; 58, loading hole; 59, external assembly frame; 60, middle support; 61, bottom insertion positioning groove; 62, top insertion positioning hole; 63, compression bolt; 64, positioning compression bolt; 65, upper compression bolt; 66, lower compression bolt. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0021] Embodiment, please refer to Figures 1-15The utility model provides a kind of welding jig for power module copper clad ceramic substrate (DBC), including jig body and copper clad ceramic substrate 6, further including bearing base 17, jig body includes upper cover plate 1, lower cover plate 4, positioning plate 5, bottom plate 7, large pressing block 2 and small pressing block 3, large pressing block 2 and small pressing block 3 are installed on lower cover plate 4, bottom plate 7 is equipped with multiple DBC positioning slot 8 and four bottom plate bolt through hole 9, multiple DBC positioning slot 8 are used for the auxiliary positioning of copper clad ceramic substrate 6, positioning plate 5 is provided with two positioning bosses 11, lower cover plate 4 is provided with two lower cover positioning groove 13 and multiple pressing block positioning hole 14, upper cover plate 1 is provided with two upper cover positioning groove 16, two lower cover positioning groove 13 are matched with two positioning bosses 11 respectively, two upper cover positioning groove 16 are matched with two positioning bosses 11 respectively, by the design of jig body, the corresponding welding jig of matching power module copper clad ceramic substrate 6 is formed, simple structure can simultaneously carry out welding to the passive device on multiple DBC, greatly increase production efficiency, the accurate degree of the relative position of DBC welding copper layer passive device and soldering pad is guaranteed by the form that each part in jig body is closely attached, the jig body is more uniform in heat conduction during welding process, can better reduce the problems such as solder layer cavity and DBC warping, greatly improve the welding process quality of power module, bottom plate 7 is installed on bearing base 17 by vertical support 18, provide supporting structure for bottom plate 7, facilitate the stability of the relative position and the rationality of space height of bottom plate 7.

[0022] It also needs to be further explained that the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 are installed on the bearing base 17 through the active driving assembly, the active driving assembly includes the rear conveying belt 19 installed on the bearing base 17 and the track adjusting frame 20 connected with the vertical support 18, the rear conveying belt 19 is fixedly connected with three progressive support plates 21 outside, the three progressive support plates 21 are all connected with the progressive clamping frame through the elastic assembly, that is, the three progressive support plates 21 are all installed with the elastic assembly, the three elastic assemblies are all connected with the progressive clamping frame, the three progressive clamping frames are all rotationally connected with the inner bushing 22 inside, the three inner bushings 22 are all fixedly connected with the transmission column 23 inside, the three transmission columns 23 are all matched with the track adjusting frame 20, the three inner bushings 22 are all fixedly connected with the upper connecting frame 24, the lower connecting frame 25 and the positioning connecting frame 26 outside respectively, the upper connecting frame 24, the lower connecting frame 25 and the positioning connecting frame 26 are fixedly connected with the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 respectively, the track adjusting frame 20 is provided with the lower horizontal track 27 and the upper vertical track 28, the lower horizontal track 27 and the upper vertical track 28 are communicated through the torsion track 29, the lower horizontal track 27, the upper vertical track 28 and the torsion track 29 are all matched with the transmission column 23, the three progressive clamping frames respectively include the first slot frame 30, the second slot frame 31 and the third slot frame 32, the first slot frame 30, the second slot frame 31 and the third slot frame 32 are sequentially arranged from top to bottom, the first slot frame 30, the second slot frame 31 and the third slot frame 32 are respectively fixedly connected with the first pressing frame 33, the second pressing frame 34 and the third pressing frame 35, the first slot frame 30, the second slot frame 31, the third slot frame 32, the first pressing frame 33, the second pressing frame 34 and the third pressing frame 35 are all provided with the half ring groove 36 matched with the inner bushing 22, the first slot frame 30 is fixedly connected with the first guide sleeve 37 between the first pressing frame 33, the second slot frame 31 is fixedly connected with the second guide sleeve 38 between the second pressing frame 34, the third slot frame 32 is fixedly connected with the third guide sleeve 39 between the third pressing frame 35, the first guide sleeve 37, the second guide sleeve 38 and the third guide sleeve 39 are respectively slidably connected with the first guide prism 40, the second guide prism 41 and the third guide prism 42, the first guide prism 40, the second guide prism 41 and the third guide prism 42 are respectively fixedly connected with the three progressive support plates 21, the three progressive support plates 21 are respectively fixedly connected with the first sleeve spring 43, the second sleeve spring 44 and the third sleeve spring 45, the first sleeve spring 43, the second sleeve spring 44 and the third sleeve spring 45 are respectively sleeved outside the first guide prism 40, the second guide prism 41 and the third guide prism 42, and the first sleeve spring 43, the second sleeve spring 44 and the third sleeve spring 45 are respectively fixedly connected with the first guide sleeve 37, the second guide sleeve 38 and the third guide sleeve 39, through the design of the active driving assembly, the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 in the matched jig body correspond to form a matched installation and power operation structure, which can realize the corresponding installation of the matched jig body relative to the bottom support plate 7, also facilitate the opening and closing driving control of the jig body, and the operation convenience is higher,More functional, more practical.

[0023] It needs to be further explained that the fixed edge frame 46 is fixedly connected to the bearing base 17, the assembly edge frame 47 is installed on the bearing base 17, the driving pulley 48 and the transmission pulley 49 are rotatably installed on the fixed edge frame 46, the rear conveying belt 19 is drivingly connected between the driving pulley 48 and the transmission pulley 49, the servo motor 50 is installed outside the fixed edge frame 46, the output shaft of the servo motor 50 is drivingly connected with the driving pulley 48, the two rotating mounting holes 51 are arranged on the assembly edge frame 47, the two rotating mounting holes 51 are matched with the driving pulley 48 and the transmission pulley 49 respectively, the track frame 52 is fixedly connected to the bearing base 17, the track sleeve 53 is arranged on the assembly edge frame 47, the track sleeve 53 is matched with the track frame 52, a plurality of threaded holes are formed in the track sleeve 53, the positioning bolts 54 for pressing and positioning the track sleeve 53 relative to the track frame 52 are threadedly connected in the plurality of threaded holes, the top end of the vertical support 18 is provided with the mounting frame 55, the mounting groove plate 56 is fixedly connected to the mounting frame 55 through pressing bolts, the four bottom plate bolt through holes 9 are all provided with the inner hexagonal bolts, the four inner hexagonal bolts are all threadedly connected with the mounting groove plate 56, the rear side of the mounting frame 55 is fixedly connected with the insertion support 57, the insertion hole 58 for inserting the track adjusting frame 20 is formed in the insertion support 57, the right end of the mounting frame 55 is fixedly connected with the external assembly frame 59, which is convenient for forming corresponding installation for welding tools, when the corresponding welding operation is manual welding, the supporting frame for supporting or placing the welding gun can be matched and installed on the external assembly frame 59 to facilitate the placement of the welding gun in the manual welding operation gap, when the welding operation is automatic welding operation, it is also convenient to provide necessary fixed installation station for welding robots, the middle support 60 is fixedly connected to the bearing base 17, the bottom insertion positioning groove 61 and the top insertion positioning hole 62 are arranged on the middle support 60, the bottom insertion positioning groove 61 and the top insertion positioning hole 62 are matched with the track adjusting frame 20, and the top insertion positioning hole 62 is provided with a screw hole, the pressing bolt 63 matched with the track adjusting frame 20 is arranged in the screw hole, which provides a structure reinforcing structure for the track adjusting frame 20, the bottom end of the track adjusting frame 20 is inserted into the bottom insertion positioning groove 61 of the middle support 60, the top end of the track adjusting frame 20 is fixed to the top insertion positioning hole 62 of the middle support 60 through the pressing bolt 63, and at the same time the track adjusting frame 20 penetrates the insertion hole 58, so as to form a three-point supporting structure of the track adjusting frame 20, thereby improving the structural stability of the track adjusting frame 20, the two positioning bolt through holes 10 are arranged on the positioning plate 5, the two lower cover bolt through holes 12 are arranged on the lower cover plate 4, the two upper cover bolt through holes 15 are arranged on the upper cover plate 1, the positioning pressing bolts 64 matched with the positioning connecting frame 26 are threadedly connected in the positioning bolt through holes 10, the upper pressing bolts 65 matched with the upper connecting frame 24 are threadedly connected in the upper cover bolt through holes 15, and the lower pressing bolts 66 matched with the lower connecting frame 25 are threadedly connected in the lower cover bolt through holes 12.The positioning plate 5, the lower cover plate 4 and the upper cover plate 1 are connected and installed with respect to the positioning connecting frame 26, the upper connecting frame 24 and the lower connecting frame 25 respectively, so as to facilitate the disassembly, maintenance and replacement of the positioning plate 5, the lower cover plate 4 and the upper cover plate 1.

[0024] The servo motor 50 in this embodiment is a conventional device known to those skilled in the art, which is purchased on the market. In this application, we only use it, and do not improve its structure and function. Its setting method, installation method and electrical connection method can be operated according to the requirements of its instruction manual by those skilled in the art, and will not be described here.

[0025] In summary, the working principle of the welding jig for the power module copper-clad ceramic substrate (DBC) is as follows: in use, first, the welding jig for the power module copper-clad ceramic substrate (DBC) is installed at the desired location, and the corresponding control circuit is connected according to the instructions of the servo motor 50. The servo motor 50 is powered to drive the rotation of the drive pulley 48. After the rotation of the drive pulley 48, the rear conveying belt 19 is driven to move, and the three progressive support plates 21 are driven to move synchronously. The synchronous movement of the three progressive support plates 21 drives the synchronous movement of the first spring sleeve 43, the second spring sleeve 44 and the third spring sleeve 45. Under the driving of the first spring sleeve 43, the second spring sleeve 44 and the third spring sleeve 45, the three progressive support plates 21 drive the three progressive clamping frames to move, and the three progressive clamping frames drive the three inner sleeves 22 to move. The movement of the three inner sleeves 22 drives the movement of the three transmission columns 23. When the height of the three transmission columns 23 changes during the movement, the transmission column 23 is adjusted to rotate under the guidance of the lower horizontal track 27, the torsion track 29 and the upper vertical track 28. That is, when the transmission column 23 moves upward in the lower horizontal track 27 and enters the upper vertical track 28, the transmission column 23 will rotate clockwise by ninety degrees through the torsion track 29. Conversely, when the transmission column 23 moves downward in the upper vertical track 28 and enters the lower horizontal track 27, the transmission column 23 will rotate counterclockwise by ninety degrees through the torsion track 29. As shown in FIG. 10, at this time, the three transmission columns 23 are located in the lower horizontal track 27, and the upper cover plate 1, the lower cover plate 4, the positioning plate 5 and the bottom supporting plate 7 are in the vertical state. Figure 1 Figure 11 ​As shown, the three transmission columns 23 are located in the upper longitudinal rails 28, and in this state, the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 will be in a relative rotation state relative to the bottom support plate 7. Due to the height change of the three inner sleeves 22, the upper connecting frame 24, the lower connecting frame 25 and the positioning connecting frame 26 will be synchronously adjusted, and the height change of the upper connecting frame 24, the lower connecting frame 25 and the positioning connecting frame 26 will form the height adjustment of the upper cover plate 1, the lower cover plate 4 and the positioning plate 5. When the three transmission columns 23 enter the lower horizontal rails 27 and continue to move downward along the lower horizontal rails 27, the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 will also continue to form a height reduction. Since the upper cover plate 1, the lower cover plate 4 and the positioning plate 5 are arranged in the order from top to bottom, during the synchronous height reduction of the upper cover plate 1, the lower cover plate 4 and the positioning plate 5, the positioning plate 5 will first contact the bottom support plate 7. During the process of height reduction of the upper cover plate 1 and the lower cover plate 4 by the continuous movement of the rear conveying belt 19, the positioning plate 5 will not be further reduced under the support of the bottom support plate 7, and the corresponding three-stage spring 45 will be elastically lengthened to ensure the continuous height reduction of the upper cover plate 1 and the lower cover plate 4. When the lower cover plate 4 contacts the top of the positioning plate 5, the positioning plate 5 supports the lower cover plate 4. After that, the continuous operation of the rear conveying belt 19 can only realize the height reduction of the upper cover plate 1, and the positioning plate 5 and the lower cover plate 4 will not be further reduced in height. During this process, the secondary spring 44 and the three-stage spring 45 will be further elastically lengthened. When the upper cover plate 1 contacts the lower cover plate 4, the complete mold of the jig body is completed, which facilitates the smooth placement of the copper clad ceramic substrate 6 and the components to be welded such as chips, resistors and pin bases into the jig body. If it is necessary to increase the relative pressure between the upper cover plate 1 and the lower cover plate 4 after complete molding, the first-stage spring 43 can be further lengthened by the continuous movement of the rear conveying belt 19 to increase the pressure between the upper cover plate 1 and the lower cover plate 4, and to ensure the relative position accuracy between the copper clad ceramic substrate 6 and each part positioned in the jig body.

[0026] Further, when the servo motor 50 controls the rear conveying belt 19 to realize reverse transmission, the movement separation of the upper cover plate 1 relative to the lower cover plate 4 can be realized first, then the movement separation of the lower cover plate 4 relative to the positioning plate 5 is realized, and finally the movement separation of the positioning plate 5 relative to the bottom support plate 7 is realized, so as to facilitate the removal of the completed copper-clad ceramic substrate 6 relative to the jig body, and then facilitate the placement operation before the next copper-clad ceramic substrate 6 is welded, and through the setting of the external assembly frame 59, a corresponding installation station can be provided for the matching equipment of the welding tool, when the corresponding welding operation is manual welding, a supporting frame for supporting or placing a welding gun can be matched and installed on the external assembly frame 59, so as to facilitate the placement of the welding gun in the manual welding operation gap, and when the welding operation is automatic welding operation, it is also convenient to provide necessary fixed installation station for welding robots, the welding jig for the copper-clad ceramic substrate of the power module can position and weld the chips, resistors and pin bases on the copper-clad ceramic substrate 6, and by replacing the upper cover plate 1, the lower cover plate 4 and the positioning plate 5, a plurality of layouts of the copper-clad ceramic substrate 6 can be matched and welded, the structure is relatively flexible in processing and manufacturing, the welding demand of the devices on the copper-clad ceramic substrate 6 is met, the jig body mainly includes six parts of the upper cover plate 1, the large pressing block 2, the small pressing block 3, the lower cover plate 4, the positioning plate 5 and the bottom support plate 7, the bottom support plate 7 is provided with a plurality of DBC positioning grooves 8, a plurality of copper-clad ceramic substrates 6 can be welded at the same time, the welding efficiency is improved, the positioning plate 5 is mainly used for positioning the positions of the chips, resistors and pin bases on the copper layer of the copper-clad ceramic substrate 6, the thickness is relatively thin, the structure is simple, and the four corners of the bottom support plate 7 are tightly matched to achieve auxiliary positioning, so the positioning precision is high, the positioning plate 5 adopts a normal mounting form, the placed devices can be clearly observed, the bottom support plate 7 and the positioning plate 5 adopt a four-corner embedded positioning structure, which can not only ensure the matching precision of the two when the jig is taken and placed, but also effectively reduce the mechanical deformation of the copper-clad ceramic substrate 6 due to welding thermal stress, the upper cover plate 1 and the lower cover plate 4 adopt a matching form of being inserted into the positioning boss 11 in sequence, the grooves between the two are used for filling the large pressing block 2 and the small pressing block 3, so as to facilitate the pressing of the devices on the surface of the copper-clad ceramic substrate 6, and finally the purpose of efficient welding is achieved.

[0027] The overall technical advantages of the jig body are as follows: The power module copper-clad ceramic substrate can be simultaneously welded, and the welding efficiency is greatly improved; The copper-clad ceramic substrate 6 with different device layouts can be welded by replacing the upper cover plate 1, the lower cover plate 4 and the positioning plate 5; The operation is simple during use, and the processing and manufacturing are convenient and low in cost; The bottom of the bottom support plate 7 is highly matched with the bottom of the furnace cavity of the reflow soldering furnace, the heat conductivity is greatly enhanced, and the welding yield is effectively improved; The present application can simultaneously weld passive devices such as chips, resistors and pin bases on the copper layer of the copper ceramic substrate 6, effectively improving the welding efficiency. The upper cover plate 1, the lower cover plate 4, the positioning plate 5 and the bottom supporting plate 7 in the present application are all made of aluminum alloy materials, which can reduce the pollution of chip, resistor or pin base caused by the falling of surface oxide particles of the jig during the welding process.

[0028] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soldering jig for a copper clad ceramic substrate (DBC) of a power module, comprising a jig body and a copper clad ceramic substrate (6), characterized in that, Also include the bearing base (17), the jig body includes the upper cover plate (1), the lower cover plate (4), the positioning plate (5), the bottom support plate (7), the large pressing block (2) and the small pressing block (3), the large pressing block (2) and the small pressing block (3) are installed on the lower cover plate (4), the bottom support plate (7) is provided with a plurality of DBC positioning grooves (8) and four bottom plate bolt through holes (9), a plurality of DBC positioning grooves (8) are used for the auxiliary positioning of the copper clad ceramic substrate (6), the positioning plate (5) is provided with two positioning bosses (11), the lower cover plate (4) is provided with two lower cover positioning grooves (13) and a plurality of pressing block positioning holes (14), the upper cover plate (1) is provided with two upper cover positioning grooves (16), two lower cover positioning grooves (13) are matched with two positioning bosses (11) respectively, two upper cover positioning grooves (16) are matched with two positioning bosses (11) respectively, the upper cover plate (1), the lower cover plate (4) and the positioning plate (5) are installed on the bearing base (17) through the driving assembly, and the bottom support plate (7) is installed on the bearing base (17) through the vertical support (18).

2. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 1, characterized in that The driving assembly includes a rear conveying belt (19) and a track adjusting frame (20), the rear conveying belt (19) is installed on the bearing base (17), the track adjusting frame (20) is connected with the vertical support (18), the rear conveying belt (19) is fixedly connected with three progressive support plates (21) outside, three progressive support plates (21) are connected with progressive clamping frames through elastic assemblies, three progressive clamping frames are rotatably connected with inner bushings (22) inside, three inner bushings (22) are fixedly connected with transmission columns (23) inside, three transmission columns (23) are matched with the track adjusting frame (20), three inner bushings (22) are fixedly connected with upper connecting frames (24), lower connecting frames (25) and positioning connecting frames (26) outside respectively, the upper connecting frame (24), the lower connecting frame (25) and the positioning connecting frame (26) are fixedly connected with the upper cover plate (1), the lower cover plate (4) and the positioning plate (5) respectively.

3. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 2, characterized in that The track adjusting frame (20) is provided with a lower horizontal track (27) and an upper vertical track (28), the lower horizontal track (27) and the upper vertical track (28) are communicated through a torsion track (29), and the lower horizontal track (27), the upper vertical track (28) and the torsion track (29) are matched with the transmission column (23).

4. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 3, characterized in that Three said progressive clamping frame respectively includes a first slot frame (30), a second slot frame (31) and a third slot frame (32), the first slot frame (30), second slot frame (31) and third slot frame (32) are sequentially arranged from top to bottom, the first slot frame (30), second slot frame (31) and third slot frame (32) are fixedly connected with first pressing frame (33), second pressing frame (34) and third pressing frame (35) respectively, the first slot frame (30), second slot frame (31), third slot frame (32), first pressing frame (33), second pressing frame (34) and third pressing frame (35) are all provided with half ring groove (36) matched with the inner bushing (22).

5. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 4, characterized in that The first slot frame (30) and the first pressing frame (33) are fixedly connected with the first guide sleeve (37), the second slot frame (31) and the second pressing frame (34) are fixedly connected with the second guide sleeve (38), the third slot frame (32) and the third pressing frame (35) are fixedly connected with the third guide sleeve (39), the first guide sleeve (37), the second guide sleeve (38) and the third guide sleeve (39) are respectively slidably connected with the first guide prism (40), the second guide prism (41) and the third guide prism (42), the first guide prism (40), the second guide prism (41) and the third guide prism (42) are respectively fixedly connected with the three progressive support plates (21), the three progressive support plates (21) are respectively fixedly connected with the first sleeve spring (43), the second sleeve spring (44) and the third sleeve spring (45), the first sleeve spring (43), the second sleeve spring (44) and the third sleeve spring (45) are respectively sleeved outside the first guide prism (40), the second guide prism (41) and the third guide prism (42), and the first sleeve spring (43), the second sleeve spring (44) and the third sleeve spring (45) are respectively fixedly connected with the first guide sleeve (37), the second guide sleeve (38) and the third guide sleeve (39).

6. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 5, characterized in that The fixed edge frame (46) is rotatably installed with a driving pulley (48) and a transmission pulley (49), the rear conveying belt (19) is drivingly connected between the driving pulley (48) and the transmission pulley (49), the fixed edge frame (46) is provided with a servo motor (50), the output shaft of the servo motor (50) is drivingly connected with the driving pulley (48), the assembly edge frame (47) is provided with two rotating mounting holes (51), and the two rotating mounting holes (51) are matched with the driving pulley (48) and the transmission pulley (49) respectively.

7. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 6, characterized in that The bearing base (17) is fixedly connected with a track frame (52), the assembly edge frame (47) is provided with a track sleeve (53), the track sleeve (53) is matched with the track frame (52), a plurality of threaded holes are formed in the track sleeve (53), and a positioning bolt (54) for pressing and positioning the track sleeve (53) relative to the track frame (52) is threadedly connected in the plurality of threaded holes.

8. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 7, characterized in that The top end of the vertical support (18) is provided with a supporting frame (55), the supporting frame (55) is fixedly connected with a mounting groove plate (56) through press-fit bolts, four bottom plate bolt through holes (9) are provided with inner hexagonal bolts, four inner hexagonal bolts are in threaded connection with the mounting groove plate (56), the rear side of the supporting frame (55) is fixedly connected with an insertion support (57), the insertion support (57) is provided with an insertion hole (58) for inserting the track adjusting frame (20), and the right end of the supporting frame (55) is fixedly connected with an external assembly frame (59).

9. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 8, characterized in that The bearing base (17) is fixedly connected with a middle support (60), the middle support (60) is provided with a bottom insertion positioning groove (61) and a top insertion positioning hole (62), the bottom insertion positioning groove (61) and the top insertion positioning hole (62) are matched with the track adjusting frame (20), and the top insertion positioning hole (62) is provided with a screw hole, and the screw hole is provided with a pressing bolt (63) matched with the track adjusting frame (20).

10. The soldering fixture for a copper clad ceramic substrate (DBC) of a power module according to claim 9, characterized in that The positioning plate (5) is provided with two positioning bolt through holes (10), the lower cover plate (4) is provided with two lower cover bolt through holes (12), and the upper cover plate (1) is provided with two upper cover bolt through holes (15); the positioning bolt through holes (10) are in threaded connection with positioning press-fit bolts (64) matched with the positioning connecting frame (26), the upper cover bolt through holes (15) are in threaded connection with upper press-fit bolts (65) matched with the upper connecting frame (24), and the lower cover bolt through holes (12) are in threaded connection with lower press-fit bolts (66) matched with the lower connecting frame (25).

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