CN115519296A

CN115519296A - Fixing method of fixing jig

Info

Publication number: CN115519296A
Application number: CN202211110689.4A
Authority: CN
Inventors: 姚金才; 陈宇; 朱超群
Original assignee: Shenzhen Hester Technology Co ltd
Current assignee: Shenzhen Hester Technology Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2022-12-27

Abstract

The invention discloses a fixing method of a fixing jig, wherein the fixing jig is used for fixing a substrate and a copper bar, and the fixing method comprises the following steps: when the first pressure pin moves towards the direction close to the substrate, acquiring a first relative extrusion force between the first pressure pin and a welding position of the substrate; determining the magnitude of the first relative extrusion force and a first threshold value; when the first relative extrusion force meets a first threshold value, limiting the position of a welding position of the first pressure pin and the substrate, and driving the second pressure pin to move towards the direction close to the copper bar; acquiring a second relative extrusion force between the second pressure pin and the solder pin of the copper bar; determining the magnitude of the second relative extrusion force and a second threshold value; when the second relative extrusion force meets a second threshold value, limiting the positions of the second pressure pin and the solder leg of the copper bar. According to the technical scheme, the copper bar is ensured to be welded at the designated position of the DBC plate, so that the welding quality of the copper bar on the DBC plate is ensured.

Description

Fixing method of fixing jig

Technical Field

The invention relates to the technical field of jig control, in particular to a fixing method for fixing a jig.

Background

In a conventional power module, a current supplied from a power supply electrode is shunted to each chip through a wire of the DBC board to energize the chip.

In order to improve the current intensity of the current provided by the power supply electrode flowing to the chip, the related technology is changed, a copper bar is generally welded on the DBC plate and connected with the power supply electrode, so that the current is shunted to each chip by utilizing the copper bar, and the volume of the unit length of the copper bar is larger than that of a lead on the DBC plate, so that the current carrying capacity of the copper bar is higher than that of the lead, and the current intensity finally flowing to the chip is higher.

When welding the copper bar on the DBC board, generally need to weld the copper bar in the assigned position of DBC board to guarantee that the electric current that passes through from the copper bar can flow on the DBC board. Adopt fixed tool simple to carry out the butt to DBC board and copper bar mostly among the correlation technique, the crimping particular case can't learn, is difficult to guarantee the assigned position of copper bar welding at the DBC board to be difficult to guarantee the welding quality of copper bar welding on the DBC board, influence the current intensity on the electric current flows to the DBC board through the copper easily.

Disclosure of Invention

The invention mainly aims to provide a fixing method of a fixing jig, aiming at ensuring that a copper bar is welded at a specified position of a DBC plate, thereby ensuring the welding quality of the copper bar on the DBC plate.

In order to achieve the above object, the fixing method of the fixing jig provided by the present invention is used for laminating a substrate and a copper bar, wherein the substrate has a welding position, the copper bar has a fillet corresponding to the welding position, and the fixing jig comprises: a base having a mounting slot configured to mount a substrate; the pressing piece is detachably arranged on the base, a first pressing pin and a second pressing pin are convexly arranged on the pressing piece, the first pressing pin presses and fixes the substrate on the bottom of the mounting groove, and an accommodating space is formed between the pressing piece and the substrate; the second pressure connecting pin extends into the accommodating space so as to fixedly press the welding pin of the copper bar to the welding position of the substrate, the pressure fixing piece is provided with a pressure sensor, and the pressure sensor is configured to detect the pressure of the first pressure connecting pin and the pressure of the second pressure connecting pin respectively; the driving mechanism is connected with the pressing and fixing piece so as to respectively drive the first pressing pin to move towards the direction close to the substrate and further press and fix the welding position of the substrate, and drive the second pressing pin to move towards the direction close to the copper bar and further press and fix the welding pin of the copper bar;

the fixing method of the fixing jig comprises the following steps:

when the first pressure connecting pin moves towards the direction close to the substrate, acquiring a first relative extrusion force between the first pressure connecting pin and a welding position of the substrate;

determining the magnitude of the first relative extrusion force and a first threshold value;

when the first relative extrusion force meets a first threshold value, limiting the position of a welding position of the first pressure pin and the substrate, and driving the second pressure pin to move towards the direction close to the copper bar;

acquiring a second relative extrusion force between the second pressure pin and the solder pin of the copper bar;

determining the magnitude of the second relative extrusion force and a second threshold value;

when second relative extrusion force satisfies the second threshold value, the position of spacing second pressure foot and the leg of copper bar.

Optionally, the pressing and fixing part includes a first pressing body and a second pressing body which are separately arranged, the first pressing pin is arranged on the first pressing body, the second pressing pin is arranged on the second pressing body, the pressure sensor includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged on the first pressing pin, and the second pressure sensor is arranged on the second pressing pin;

the determining of the magnitudes of the first relative squeezing force and the first threshold value specifically includes,

when the first relative extrusion force is greater than or equal to a first set value and less than a second set value, determining that the first pressure pin is in contact with the welding position of the substrate, and continuously driving the first pressure pin to compress the welding position of the substrate;

when the first relative extrusion force is larger than or equal to a second set value, determining that the first pressure welding pin presses and fixes the welding position of the substrate, and limiting the position of the welding position of the first pressure welding pin and the substrate, wherein the first set value is smaller than the second set value.

Optionally, the first pressing body has a first plate surface and a second plate surface opposite to each other, the second plate surface is disposed toward the mounting groove, the first pressing body is provided with a positioning hole penetrating through the first plate surface and the second plate surface, the positioning hole is configured to expose a solder leg of the copper bar, the second pressing body is disposed through the positioning hole, and the first pressing body is provided with an image sensor;

after the position of the welding position of the first limit pin and the substrate is limited, the device also comprises a first pressure pin,

acquiring an image on the first pressing solid body and extracting an image area corresponding to the positioning hole;

analyzing an image area of the positioning hole;

when the image area contains the leg of the copper bar, the second presser foot is driven to move towards the direction close to the copper bar.

Optionally, the analyzing the image area of the positioning hole specifically includes:

determining the position of a welding leg of the copper bar in the internal image data;

when the position of the welding leg of the copper bar is a set position, determining the number of the welding legs of the copper bar in the internal image data;

when the data of the welding leg of the copper bar is the same as that of the second pressing leg, the second pressing leg is driven to move towards the direction close to the copper bar.

Optionally, the determining the magnitudes of the second relative extrusion force and the second threshold specifically includes:

when the second relative extrusion force is greater than or equal to a third set value and less than a fourth set value, determining that the second pressing pin is in contact with the welding leg of the copper bar, and continuously driving the second pressing pin to press the welding leg of the copper bar;

and when the first relative extrusion force is greater than or equal to a fourth set value, determining the welding position of the substrate pressed and fixed by the second pressure welding pin, and limiting the positions of the second pressure welding pin and the welding pin of the copper bar, wherein the third set value is less than the fourth set value.

Optionally, a limiting column is arranged at the bottom of the mounting groove, and the limiting column is configured to be sleeved with a limiting hole of the substrate;

before first pressure foot moves towards the direction that is close to the base plate, still include:

detecting the real-time positions of the base plate and the mounting groove when the base plate is mounted on the base;

determining the position of the mounting groove where the substrate is positioned;

when the substrate deviates from the limiting column of the mounting groove, the position of the substrate is adjusted, so that the limiting hole of the substrate is sleeved on the limiting column of the mounting groove.

Optionally, the first compression joint pin is provided with a sleeve hole corresponding to the limiting column, and the sleeve hole is detachably sleeved on the limiting column;

detecting real-time positions of the first pressure pin and the limiting column;

when the trepanning of first pressure pin deviates from spacing post, adjust the position of first pressure pin to make the trepanning cover of first pressure pin locate on the spacing post.

Optionally, a supporting column is further arranged on the base, the supporting column is arranged to avoid the installation groove, and the supporting column is configured to support a lug protruding from the side edge of the copper bar.

Optionally, the base is provided with a limiting groove, the supporting column is arranged in the limiting groove, and the groove wall of the limiting groove is configured to be in limiting abutment with two opposite side edges of the lug on the side of the copper bar.

Optionally, the base is further provided with a positioning groove, the positioning groove is arranged close to the mounting groove, the fixing jig further comprises a limiting piece, the limiting piece comprises a mounting portion and a limiting portion which are connected, the mounting portion is detachably mounted on the positioning groove, the limiting portion extends to the accommodating space, the limiting portion is provided with an accommodating hole, and the accommodating hole is configured to accommodate a copper block so as to limit the copper block in a preset area of the DBC board; the substrate comprises a plurality of DBC plates which are arranged in a row or column shape, and two ends of each copper block respectively cover the preset areas of the adjacent DBC plates;

the method of securing may further include,

detecting real-time positions of two ends of the copper block and a preset area of an adjacent DBC board respectively;

and when each end of the copper block partially or completely covers the preset area of the DBC plate, limiting the two ends of the copper block in the preset areas of the adjacent DBC plates.

According to the technical scheme, when the first pressure pin moves towards the direction close to the substrate, the first relative extrusion force between the first pressure pin and the welding position of the substrate is obtained, the size of the first relative extrusion force and a first threshold value is determined, and when the first relative extrusion force meets the first threshold value, the position of the welding position of the first pressure pin and the substrate is limited, so that the relative position of the first pressure pin and the substrate can be ensured; when spacing first pressure pin and base plate, drive second pressure pin moves towards the direction that is close to the copper bar, acquire the second relative extrusion force between the second pressure pin and the leg of copper bar, confirm the size of second relative extrusion force and second threshold value, when second relative extrusion force satisfies the second threshold value, the position of spacing second pressure pin and the leg of copper bar, the position of second pressure pin and copper bar is stable, and then make and can not take place relative displacement between the leg of copper bar and the welding position of base plate, thereby make the copper bar when the welding, the welding position on the DBC board of base plate that the leg can stabilize welds, thereby guarantee the welding quality of copper bar welding on the DBC board, with the current intensity that assurance electric current passes through the copper drainage on the DBC board.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of a fixing jig according to the present invention;

FIG. 2 is a schematic view of another view angle of the fixing jig of the present invention;

FIG. 3 is a schematic view of the structure of the present invention in which the substrate and the copper bar are mounted on the base;

FIG. 4 is a schematic structural view of a base and a limiting member of the fixing jig of the present invention;

FIG. 5 is a schematic structural view of a first press-solid of the fixing jig of the present invention;

FIG. 6 is a schematic structural view of a second press solid of the fixing jig of the present invention;

FIG. 7 is a schematic view of a substrate according to the present invention;

FIG. 8 is a schematic view of the structure of the copper bar of the present invention;

fig. 9 is a flowchart of a fixing method of the fixing jig of the present invention.

The reference numbers illustrate:

reference numerals	Name(s)	Reference numerals	Name (R)
				100	Base seat	110	Mounting groove
111	Limiting column	120	Limiting groove
				121	Support column	122	Spacing protrusion
210	First press-fixing body	211	First press pin
				212	The first plate surface	213	Second plate surface
214	Locating hole	215	Trepan boring
				220	Second press-fixing body	221	Second press-connection pin
222	Counterweight body	230	Accommodation space
				300	Position limiting piece	310	Mounting part
320	Position limiting part	321	Receiving hole
				400	Substrate	401	Supporting plate
402	DBC board	410	Welding position
				420	Limiting hole	430	Predetermined area
500	Copper bar	510	Solder leg
				520	Convex lug	521	Mounting hole
600	Copper block

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions relating to "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The following description will mainly describe a specific structure of the fixing jig and a fixing method of the fixing jig.

Referring to fig. 1 to 8, in an embodiment of the present invention, the fixing jig is used for fixing a substrate 400 and a copper bar 500, the substrate 400 has a welding position 410, the copper bar 500 has a fillet 510 corresponding to the welding position 410, and the fixing jig includes:

a base 100, the base 100 having a mounting groove 110, the mounting groove 110 configured to mount a substrate 400;

the pressing piece is detachably arranged on the base 100, the pressing piece is convexly provided with a first pressing pin 211 and a second pressing pin 221, the first pressing pin 211 presses and fixes the substrate 400 on the bottom of the mounting groove 110, and an accommodating space 230 is formed between the pressing piece and the substrate 400; the second pressing leg 221 extends into the accommodating space 230 to press and fix the soldering leg 510 of the copper bar 500 to the soldering position 410 of the substrate 400.

Specifically, in the present embodiment, the shape of the cross section of the base 100 can be selected from various shapes, such as a circle, an ellipse, a square, a rectangle, etc., and in the present embodiment, the cross section is a rectangle. The shape and size of the mounting groove 110 can be determined according to the shape and size of the substrate 400 to be matched with the substrate 400, so that after the substrate 400 is mounted in the mounting groove 110, the peripheral wall of the substrate 400 is limited by the wall of the mounting groove 110, and the substrate 400 is not easy to move left and right on the mounting groove 110, so that the limit of the mounting groove 110 is obtained. It should be noted that the substrate 400 includes a DBC board 402 and a supporting board 401 for supporting the DBC board 402, the supporting board 401 can also dissipate heat while supporting the DBC board 402, and the soldering site 410 is located on the DBC board 402.

The pressing member can be detachably mounted on the base 100 in many ways, such as clamping, plugging, sleeving, etc., and is not limited in this regard. The pressing member may be located above the mounting groove 110, and the first pressing pin 211 and the second pressing pin 221 may be located on a surface of the pressing member facing the mounting groove 110, so that the first pressing pin 211 may press the substrate 400 onto the bottom of the mounting groove 110 by gravity, and at the same time, the accommodating space 230 may be separated between the pressing member and the substrate 400, so as to accommodate the second pressing pin 221 and the solder pin 510 of the copper bar 500. Thus, in operation, the substrate 400 can be installed at the bottom of the installation groove 110, then the copper bar 500 is placed on the substrate 400 according to the direction and position of the solder leg 510 aligned to the soldering position 410 of the substrate 400, and then the pressing member is installed, so that when the first pressing leg 211 presses the substrate 400, the second pressing leg 221 extends into the accommodating space 230 to press and fix the solder leg 510 of the copper bar 500 to the soldering position 410 of the substrate 400 by gravity, so that no relative displacement occurs between the solder leg 510 of the copper bar 500 and the soldering position 410 of the substrate 400, and finally the copper bar 500 and the substrate 400 are moved together with the fixing jig in the reflow oven, so that the solder leg 510 of the copper bar 500 is soldered to the soldering position 410 of the substrate 400, and after soldering is completed, the pressing member is removed, and the soldered copper bar 500 and the substrate 400 can be taken out. It should be noted that, in practical applications, the positions of the first pressure pin 211 and the second pressure pin 221 may be reasonably arranged according to the position of the soldering position 410 of the substrate 400, so as to ensure that the second pressure pin 221 can press and fix the solder leg 510 of the copper bar 500 to the soldering position 410 of the substrate 400 while the first pressure pin 211 presses and fixes the substrate 400.

According to the technical scheme, the base plate 400 is limited by the base 100 by arranging the mounting groove 110 for mounting the base plate 400 on the base 100, then the pressing piece is arranged, the first pressing pin 211 and the second pressing pin 221 are arranged on the pressing piece in a protruding mode, so that the pressing piece presses and fixes the base plate 400 on the bottom of the mounting groove 110 through the first pressing pin 211 by means of gravity, meanwhile, the pressing piece presses and fixes the welding pin 510 of the copper bar 500 on the welding position 410 of the base plate 400 through the second pressing pin 221 by means of gravity, relative displacement cannot occur between the welding pin 510 of the copper bar 500 and the welding position 410 of the base plate 400, and therefore when the copper bar 500 is welded, the welding pin 510 can be stably welded on the welding position 410 on the DBC plate 402 of the base plate 400, the welding quality of the copper bar 500 on the DBC plate 402 is guaranteed, and the current intensity of the current flowing to the DBC plate 402 through the copper bar 500 is guaranteed.

In some embodiments, the pressing member includes a first pressing member 210 and a second pressing member 220, which are separately disposed, the first pressing pin 211 is disposed on the first pressing member 210, and the second pressing pin 221 is disposed on the second pressing member 220. It can be understood that, the first pressure connecting pin 211 and the second pressure connecting pin 221 are respectively abutted against the substrate 400 and the copper bar 500 during operation, which is easy to cause abrasion during long-term operation, and the present embodiment is configured such that the first pressure connecting pin 211 or the second pressure connecting pin 221 can be independently replaced by independently replacing the first pressure solid 210 or the second pressure solid 220, so that one of the first pressure connecting pin 211 or the second pressure connecting pin 221 can be independently replaced without discarding the whole body when one of the first pressure connecting pin 211 or the second pressure connecting pin 221 has poor use effect or is damaged, which is beneficial to saving cost; in addition, the second pressing bodies 220 can be replaced independently to replace different second pressing pins 221, so that the copper bar pressing fixture is suitable for different copper bars 500, and the applicability of the fixing fixture is improved.

Regarding the installation manner of the first pressing solid 210 and the second pressing solid 220, in some embodiments, the first pressing solid 210 has a first plate surface 212 and a second plate surface 213 opposite to each other, the second plate surface 213 is disposed toward the installation groove 110, the first pressing solid 210 is formed with a positioning hole 214 penetrating through the first plate surface 212 and the second plate surface 213, the positioning hole 214 is configured to expose the solder leg 510 of the copper bar 500, and the second pressing solid 220 is disposed through the positioning hole 214. During operation, the first press solid 210 may be pressed and fixed on the substrate 400, and then the second press solid 220 is inserted into the positioning hole 214 of the first press solid 210, during actual design, the opening position of the positioning hole 214 corresponds to the solder leg 510 of the copper bar 500 to expose the solder leg 510 of the copper bar 500, so that after the second press solid 220 is inserted into the positioning hole 214 from the first plate surface 212, the second press leg 221 may be pressed against the solder leg 510 of the copper bar 500 to press and fix the solder leg 510 of the copper bar 500 on the welding position 410 of the substrate 400.

Further, the top of the second compacting body 220 protrudes from the first board surface 212, and a weight body 222 protrudes along the transverse direction, and the orthographic projection of the weight body 222 on the first board surface 212 is located outside the positioning hole 214. Thus, when the first pressing solid body 210 is pulled to detach the first pressing solid body 210 from the base 100, the weight body 222 is overlapped on the first plate surface 212 of the first pressing solid body 210, so that the second pressing solid body 220 is not dropped from the positioning hole 214, but is detached from the base 100 along with the first pressing solid body 210, which is beneficial to improving the rapidness of detaching the pressing solid body; in addition, the arrangement of the counterweight 222 can also increase the pressing force of the second pressing pin 221 against the solder leg 510 of the copper bar 500, so as to further ensure that no relative displacement occurs between the solder leg 510 of the copper bar 500 and the soldering position 410 of the substrate 400, thereby ensuring that the solder leg 510 can be stably soldered to the soldering position 410 on the DBC board 402 of the substrate 400.

In order to improve the pressing effect of the first pressing member 210 on the substrate 400, in some embodiments, the first pressing member 210 is shaped like a plate opposite to the substrate 400, the number of the first pressing pins 211 is multiple, and the multiple first pressing pins 211 are convexly disposed at each corner of the first pressing member 210. Therefore, each corner of the substrate 400 can be pressed by the second pressing body 220, so that the substrate 400 is not easy to tilt and is uniformly stressed, and the effect of pressing the substrate 400 at the bottom of the mounting groove 110 by the first pressing body 210 is improved.

In some embodiments, the bottom of the mounting groove 110 is provided with a limiting column 111, and the limiting column 111 is configured to be sleeved with the limiting hole 420 of the substrate 400. Therefore, the limiting columns 111 can limit the displacement of the substrate 400, and the fixing effect of the fixing jig on the substrate 400 is further improved. Further, the first pressure pin 211 is provided with a sleeve hole 215 corresponding to the limiting column 111, and the sleeve hole 215 is detachably sleeved on the limiting column 111. Therefore, on one hand, the limiting column 111 can limit the displacement of the first pressure pin 211 and even the pressure-fixing piece, so that the first pressure pin 211 and even the pressure-fixing piece can stably and reliably press and fix the substrate 400 and the copper bar 500, the fixing effect of the fixing jig on the substrate 400 and the copper bar 500 is further improved, and the welding quality of the copper bar 500 welded on the substrate 400 is improved; on the other hand, can also play the positioning action to first pressure pin 211 to the quick accurate preset position of installing in base 100 of pressing the firmware improves fixed tool's work efficiency.

In some embodiments, a supporting pillar 121 is further disposed on the base 100, the supporting pillar 121 is disposed to be away from the mounting groove 110, and the supporting pillar 121 is configured to support a lug 520 protruding from a side of the copper bar 500. The setting of support column 121 is favorable to improving the equilibrium and the steadiness of copper bar 500 for copper bar 500 can weld on base plate 400 according to predetermined angle, improves the welding quality that copper bar 500 welded in base plate 400. During actual design, the top surface of the supporting column 121 can be provided with the limiting protrusion 122, and the mounting hole 521 of the lug 520 on the side of the copper bar 500 is sleeved on the limiting protrusion 122, so that the supporting column 121 supports the lug 520, and meanwhile, the limiting protrusion 122 can also limit the shaking of the lug 520, thereby further improving the balance of the copper bar 500.

Further, the base 100 is provided with a limiting groove 120, the supporting column 121 is disposed in the limiting groove 120, and a groove wall of the limiting groove 120 is configured to be in limiting abutment with two opposite side edges of the lug 520 at the side of the copper bar 500. So, further restriction rocking of lug 520 has improved the equilibrium and the steadiness of copper bar 500 for copper bar 500 can weld on base plate 400 according to predetermined angle, improves the welding quality that copper bar 500 welded in base plate 400.

In some embodiments, the base 100 further includes a positioning groove disposed near the mounting groove 110, the fixing fixture further includes a limiting member 300, the limiting member 300 includes a mounting portion 310 and a limiting portion 320 connected to each other, the mounting portion 310 is detachably mounted on the positioning groove, the limiting portion 320 extends to the accommodating space 230, the limiting portion 320 is provided with an accommodating hole 321, and the accommodating hole 321 is configured to accommodate the copper block 600, so as to limit the copper block 600 to the preset region 430 of the DBC board 402. It can be understood that, the substrate 400 generally includes more than two DBC boards 402, and the copper block 600 may be used to connect two adjacent DBC boards 402, so it is necessary to weld the copper block 600 to the predetermined area 430 of the DBC board 402, in this embodiment, the shape and size of the receiving hole 321 may be adapted to the shape and size of the copper block 600, so that when the copper block 600 is placed in the receiving hole 321, the peripheral wall of the copper block 600 is limited by the hole wall of the receiving hole 321, so that the copper block 600 is not easily moved left and right in the receiving hole 321, so as to obtain the fixation of the receiving hole 321, so that the copper block 600 can be welded to the predetermined position of the DBC board 402, improve the welding quality of the copper block 600 to the DBC boards 402, and ensure that the copper block 600 can electrically connect the two adjacent DBC boards 402.

The fixing method of the fixing jig of the invention is used for pressing the substrate 400 and the copper bar 500. The base plate 400 has a welding position 410, the copper bar 500 has a leg 510 corresponding to the welding position 410, and the fixing jig includes: a base 100, the base 100 having a mounting groove 110, the mounting groove 110 configured to mount a substrate 400; the pressing piece is detachably arranged on the base 100, the pressing piece is convexly provided with a first pressing pin 211 and a second pressing pin 221, the first pressing pin 211 presses and fixes the substrate 400 at the bottom of the mounting groove 110, and an accommodating space 230 is formed between the pressing piece and the substrate 400; the second pressure pin 221 extends into the accommodating space 230 to press and fix the solder leg 510 of the copper bar 500 to the soldering position 410 of the substrate 400, and the press-fixing member is provided with a pressure sensor configured to detect the pressure of the first pressure pin 211 and the second pressure pin 221 respectively; and the driving mechanism is connected with the pressing piece so as to respectively drive the first pressing pin 211 to move towards the direction close to the substrate 400 and further press and fix the welding position 410 of the substrate 400, and drive the second pressing pin 221 to move towards the direction close to the copper bar 500 and further press and fix the welding pin 510 of the copper bar 500. Referring to fig. 9, fig. 9 is a flowchart of a fixing method of the fixing jig of the present invention. In an embodiment of the present invention, the fixing method of the fixing jig includes the following steps:

s110, when the first pressure pin moves towards the direction close to the substrate, a first relative extrusion force between the first pressure pin and the welding position of the substrate is obtained. Specifically, a first compression joint pin of the compression member is used for compressing and fixing the welding position of the substrate, and a second compression joint pin of the compression member is used for compressing and fixing the welding pin of the copper bar. When the copper bar is fixed, the first compression joint pin is firstly utilized to press and fix the substrate, and then the second compression joint pin is utilized to press and fix the copper bar. In order to improve the accuracy and reliability of the press-fixing, the relative extrusion force of the press-fixing target needs to be detected when the first press-connecting pin and the second press-connecting pin are utilized. The first pressure pin and the second pressure pin are driven by the driving mechanism to move towards the target. The pressure firmware is equipped with pressure sensor, when first pressure foot and second pressure foot realize the crimping, can detect the extrusion force that receives of first pressure foot and second pressure foot respectively. Wherein, the extrusion force between the first pressure pin and the welding position of the substrate is a first relative extrusion force; the extrusion force of the second pressure pin and the welding pin of the copper bar is a second relative extrusion force.

And S120, determining the first relative extrusion force and the first threshold value. Specifically, the first threshold value is a set extrusion force threshold value, when the first relative extrusion force meets the set extrusion force threshold value, the pressing stability of the welding position of the first pressure pin and the substrate is indicated, and when the first relative extrusion force does not meet the set extrusion force threshold value, the pressing instability of the welding position of the first pressure pin and the substrate is indicated. It is understood that the first threshold may be set according to actual requirements, and is not limited herein.

S130, when the first relative extrusion force meets a first threshold value, limiting the position of the welding position of the first pressure pin and the substrate, and driving the second pressure pin to move towards the direction close to the copper bar. In this step, the first relative extrusion force satisfies a first threshold, the first presser foot is stably pressed and fixed with the welding position of the substrate, at this time, the position of the welding position of the first presser foot and the substrate is limited and fixed, the operation of pressing the substrate by the first presser foot is completed, at this time, the driving mechanism stops driving the first presser foot to move, and drives the second presser foot to move towards the direction of the copper bar.

S140, second relative extrusion force between the second pressing foot and the welding foot of the copper bar is obtained. In this step, the second crimping foot pressure solid copper bar also needs the extrusion force between the two to detect to realize the pressure solid operation better. The second pressure foot is close to the pressure value of second relative extrusion force when contacting with the copper bar towards the copper bar and is 0, and when the copper bar was consolidated in the pressure of second pressure foot, second relative extrusion force grow gradually. The second relative extrusion force is too small, so that the displacement of the copper bar is easy to occur; if the second relative pressing force is too large, too much driving force is consumed, and it is difficult to limit and fix the position. In practical application, the second relative extrusion force is compared with a second threshold value.

And S150, determining the magnitude of the second relative extrusion force and a second threshold value. Specifically, the second threshold is also a set extrusion force threshold. When the second relative extrusion force meets the set extrusion force threshold, the pressing stability of the second pressing pin and the welding leg of the copper bar is represented, and when the second relative extrusion force does not meet the set extrusion force threshold, the pressing stability of the second pressing pin and the welding leg of the copper bar is represented. It is understood that the second threshold can be set according to practical requirements, and is not limited herein.

The magnitudes of the first threshold and the second threshold may be specifically set according to the material of the extrusion target, and are not limited herein. The first threshold and the second threshold are merely descriptive differences.

And S160, when the second relative extrusion force meets a second threshold value, limiting the positions of the second pressure pin and the solder pin of the copper bar. Specifically, the second relative extrusion force satisfies the second threshold value, and the second crimping foot is solid stable with the pressure of the leg of copper bar, and at this moment, spacing and fixed the position of second crimping foot and the leg of copper bar utilize the operation completion of second crimping foot crimping copper bar, and actuating mechanism stops to drive the motion of second crimping foot this moment.

In some embodiments, the pressing member includes a first pressing member 210 and a second pressing member 220, which are separately disposed, the first pressing pin 211 is disposed on the first pressing member 210, the second pressing pin is disposed on the second pressing member 220, the pressure sensor includes a first pressure sensor and a second pressure sensor, the first pressure sensor is disposed on the first pressing pin 211, and the second pressure sensor is disposed on the second pressing pin. The determining of the magnitudes of the first relative squeezing force and the first threshold value specifically includes,

In this embodiment, in order to more accurately realize the pressing operation of the first pressing pin and the substrate, the first relative pressing force is mainly divided into two stages for description. Specifically, when the first relative pressing force is smaller than the first predetermined value, the first pressing pin may not be in contact with the substrate. When the first relative extrusion force is greater than or equal to the first set value and less than or equal to the second set value, the first pressure pin and the substrate are contacted at the moment, but the pressure fixation of the first pressure pin and the substrate is unstable, and the substrate is easy to shift. When the first relative extrusion force is greater than the second set value, the pressing of the first relative extrusion force and the second relative extrusion force is stable, and the position of the first pressing pin and the position of the substrate are limited at the moment.

Further, the first press solid body 210 has a first plate surface 212 and a second plate surface 213 opposite to each other, the second plate surface 213 is disposed toward the mounting groove 110, the first press solid body 210 is provided with a positioning hole 214 penetrating through the first plate surface 212 and the second plate surface 213, the positioning hole 214 is configured to expose the solder leg 510 of the copper bar 500, the second press solid body 220 is disposed through the positioning hole 214, and the first press solid body is provided with an image sensor. After limiting the position of the welding position of the first pressure pin and the substrate, the method also comprises the following steps,

analyzing the image area of the positioning hole;

In this step, when the second presser foot is driven to move towards the direction close to the copper bar, the positions of the second presser foot and the solder foot of the copper bar need to be calibrated to ensure the reliability of the crimping. Correspondingly, when the first presser foot is in pressure connection with the substrate, the position of the welding part of the first presser foot and the substrate needs to be calibrated so as to ensure the welding quality of the welding part of the subsequent substrate and the welding foot of the copper bar.

In some embodiments, the analyzing the image area of the positioning hole specifically includes:

Specifically, the leg of copper bar has a plurality ofly, and the quantity of second crimping foot also is a plurality ofly, and in order to guarantee the steadiness of every copper bar leg, the quantity that the second crimping foot corresponds the leg sets up. The quantity of pressing the foot at the second is different with the quantity of leg, needs in time to change the second and presses solid.

In a specific embodiment, the determining the magnitudes of the second relative squeezing force and the second threshold specifically includes:

when the second relative extrusion force is greater than or equal to the third set value and less than the fourth set value, determining that the second pressure pin is in contact with the welding leg of the copper bar, and continuously driving the second pressure pin to compress the welding leg of the copper bar;

when the first relative extrusion force is larger than or equal to a fourth set value, the welding position of the substrate is fixed by pressing the second pressing pin, the position of the second pressing pin and the position of the welding pin of the copper bar are limited, and the third set value is smaller than the fourth set value.

In this embodiment, in order to more accurately realize the pressing and fixing operation of the second pressing leg and the copper bar, the second relative pressing force is mainly divided into two stages for description. Specifically, when the second relative extrusion force is smaller than the third set value, the second pressing pin and the copper bar may not be in contact or not in contact at this time. When the second relative extrusion force is greater than or equal to the third set value and less than or equal to the fourth set value, the second press pin is in contact with the copper bar at the moment, but the press fixation of the second press pin and the copper bar is unstable, and the copper bar is easy to shift. When the second relative extrusion force is greater than the fourth set value, the pressing between the second relative extrusion force and the fourth set value is stable, and the second pressing pin and the copper bar are limited at the moment.

In some embodiments, a limiting column 111 is disposed at the bottom of the mounting groove 110, and the limiting column 111 is configured to be sleeved by a limiting hole 420 of the substrate 400;

In this step, since the substrate is mounted in the mounting groove, the mounting groove has a large area in practical application, and in order to ensure mounting accuracy, the positions of the substrate and the mounting groove need to be calibrated. Specifically, when the substrate deviates from the limiting column of the mounting groove, the position of the substrate is adjusted, so that the substrate is sleeved on the limiting column, and accurate mounting is realized.

Correspondingly, the first press pin 211 is provided with a sleeve hole 215 corresponding to the limiting column 111, and the sleeve hole 215 is detachably sleeved on the limiting column 111;

when the trepanning of the first pressure pin deviates from the limiting column, the position of the first pressure pin is adjusted so that the trepanning of the first pressure pin is sleeved on the limiting column. Through foretell step, can realize the accurate assembly of first pressure pin and spacing post, improve the welded reliability.

Specifically, the base 100 is further provided with a positioning groove, the positioning groove is arranged close to the mounting groove 110, the fixing jig further comprises a limiting member 300, the limiting member 300 comprises a mounting portion 310 and a limiting portion 320 which are connected, the mounting portion 310 is detachably mounted on the positioning groove, the limiting portion 320 extends to the accommodating space 230, the limiting portion 320 is provided with an accommodating hole 321, and the accommodating hole 321 is configured to accommodate the copper block 600 so as to limit the copper block 600 in a preset area 430 of the DBC plate 402; the substrate 400 includes a plurality of DBC plates 402 arranged in a row or a column, and both ends of the copper block 600 respectively cover the preset regions 430 of the adjacent DBC plates 402;

the method of securing may further include,

In this step, considering that the substrate includes a plurality of DBC plates arranged in a row or a column, adjacent DBC plates need to be fixed by brazing. In order to improve the reliability of welding, the position of the copper block needs to be detected, that is, when the two ends of the copper block respectively partially or completely cover the preset regions of the DBC board, the two ends of the copper block are respectively welded to the preset regions of the adjacent DBC board, and the adjacent DBC board can be electrically connected stably, otherwise, the position of the copper block needs to be adjusted, and the two ends of the copper block respectively partially or completely cover the preset regions of the DBC board.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The fixing method of the fixing jig is characterized in that the fixing jig is used for pressing a substrate and a copper bar, the substrate is provided with a welding position, the copper bar is provided with a welding foot corresponding to the welding position, and the fixing jig comprises: a base having a mounting slot configured to mount a substrate; the pressing piece is detachably arranged on the base, a first pressing pin and a second pressing pin are convexly arranged on the pressing piece, the first pressing pin presses and fixes the substrate on the bottom of the mounting groove, and an accommodating space is formed between the pressing piece and the substrate; the second pressure connecting pin extends into the accommodating space so as to fixedly press the welding pin of the copper bar to the welding position of the substrate, the pressure fixing piece is provided with a pressure sensor, and the pressure sensor is configured to detect the pressure of the first pressure connecting pin and the pressure of the second pressure connecting pin respectively; the driving mechanism is connected with the pressing and fixing piece so as to respectively drive the first pressing pin to move towards the direction close to the substrate and further press and fix the welding position of the substrate, and drive the second pressing pin to move towards the direction close to the copper bar and further press and fix the welding pin of the copper bar;

the fixing method of the fixing jig comprises the following steps:

when the first pressure pin moves towards the direction close to the substrate, acquiring a first relative extrusion force between the first pressure pin and a welding position of the substrate;

when the first relative extrusion force meets a first threshold value, limiting the position of a welding position of the first pressure connecting pin and the substrate, and driving the second pressure connecting pin to move towards the direction close to the copper bar;

acquiring a second relative extrusion force between the second pressing pin and the welding pin of the copper bar;

when the second relative extrusion force meets a second threshold value, limiting the positions of the second pressure pin and the solder leg of the copper bar.

2. The method according to claim 1, wherein the pressing member includes a first pressing member and a second pressing member that are separately disposed, the first pressing member is disposed on the first pressing member, the second pressing member is disposed on the second pressing member, the pressure sensor includes a first pressure sensor and a second pressure sensor, the first pressure sensor is disposed on the first pressing member, and the second pressure sensor is disposed on the second pressing member;

when the first relative extrusion force is larger than or equal to a second set value, the welding position of the substrate is fixed by pressing the first pressure welding pin, and the position of the welding position of the first pressure welding pin and the substrate is limited, wherein the first set value is smaller than the second set value.

3. The fixing method of the fixing jig according to claim 2, wherein the first fixing body has a first plate surface and a second plate surface opposite to each other, the second plate surface is disposed toward the mounting groove, the first fixing body is provided with a positioning hole penetrating through the first plate surface and the second plate surface, the positioning hole is configured to expose a solder leg of the copper bar, the second fixing body is disposed through the positioning hole, and the first fixing body is provided with an image sensor;

after limiting the position of the welding position of the first pressure pin and the substrate, the method also comprises the following steps,

analyzing an image area of the positioning hole;

4. The method according to claim 3, wherein analyzing the image area of the positioning hole comprises:

5. The method as claimed in claim 2, wherein the determining the second relative pressing force and the second threshold comprises:

6. The method as claimed in claim 1, wherein a spacing post is disposed at a bottom of the mounting groove, and the spacing post is configured to fit a spacing hole of the substrate;

when the substrate deviates from the limiting column of the mounting groove, the position of the substrate is adjusted so that the limiting hole of the substrate is sleeved on the limiting column of the mounting groove.

7. The method according to claim 6, wherein the first press-connecting leg has a sleeve hole corresponding to the position-limiting post, and the sleeve hole is detachably sleeved on the position-limiting post;

when the trepanning of the first pressure pin deviates from the limiting column, the position of the first pressure pin is adjusted so that the trepanning of the first pressure pin is sleeved on the limiting column.

8. The method according to claim 1, wherein a supporting post is further disposed on the base, the supporting post is disposed to avoid the mounting groove, and the supporting post is configured to support a protruding lug protruding from a side of the copper bar.

9. The method according to claim 8, wherein the base has a limiting groove, the supporting post is disposed in the limiting groove, and the wall of the limiting groove is configured to limit and abut against two opposite sides of the lug of the side of the copper bar.

10. The fixing method of the fixing jig according to claim 1, wherein the base further has a positioning groove disposed adjacent to the mounting groove, the fixing jig further includes a limiting member, the limiting member includes a mounting portion and a limiting portion connected to each other, the mounting portion is detachably mounted to the positioning groove, the limiting portion extends to the receiving space, the limiting portion has a receiving hole configured to receive the copper block so as to limit the copper block to a predetermined region of the DBC board; the substrate comprises a plurality of DBC plates which are arranged in a row or column shape, and two ends of each copper block respectively cover the preset areas of the adjacent DBC plates;

the method of securing may further include,