CN113422233A

CN113422233A - Electric connector and manufacturing method and tool thereof

Info

Publication number: CN113422233A
Application number: CN202110716860.5A
Authority: CN
Inventors: 尹新剑; 马陆飞; 周国奇; 杨龙; 王占云
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-09-21
Anticipated expiration: 2041-06-25
Also published as: CN113422233B

Abstract

The electric connector comprises an insulator, a contact element and a tin ball, wherein a process groove for enabling the wall thickness of the insulator to be uniform is formed in the insulator, an interference part which is tilted in the material thickness direction of the contact element is arranged in a linear area of the contact element, the interference part is in interference fit with an insertion hole in the insulator in the material thickness direction, through grooves are formed in the edge end faces of the shorter edge of the insulator, and the through grooves are symmetrically formed in two end faces of the insulator. A large number of process grooves are added in the insulator, so that the wall thickness of each part of the insulator is uniform as much as possible, and the phenomenon of overlarge warping deformation is avoided. The interference part is arranged in the material thickness direction of the contact piece, and by the structure, on one hand, the interference in the material width direction is not needed, so that the gap between the contact pieces is increased, on the other hand, the requirement that the contact pieces need to be fixed on the insulator is also met, and after the stress is released, the contact pieces cannot warp.

Description

Electric connector and manufacturing method and tool thereof

Technical Field

The invention belongs to the technical field of connectors, and particularly relates to an electric connector, a manufacturing method thereof and a tool.

Background

In the prior art, the electrical connector shown in fig. 1-1 to 1-2, the large-sized thin-walled insulator 1 inevitably undergoes buckling deformation during manufacturing. The conventional structure and the conventional measurement method are to measure the maximum outline edge of the film as a measurement reference, I4 and II5 in the figure. The disadvantage of this method of selecting the reference is that the size of the reference is unstable, because the reference itself will warp and deform, causing erroneous judgment for the measuring personnel.

As shown in fig. 1-3-1 to 1-3-2, the protrusion I101 on the back surface of the insulator 1 is basically of the structure as shown in the figure, and the protrusion 101 extends to the edge of the insulator 1, which has the disadvantage that when the insulator 1 is produced by injection molding, the joint of the upper and lower dies of the mold is at the edge, and glue is easy to run, which results in poor appearance of the product and thus affects assembly.

As shown in fig. 1-4-1 to 1-4-4, the contact 2 is fixed to the insulator 1 in such a manner that barbs 207 on the contact 2 in the material width direction are interference-fitted into insertion holes in the insulator 1. When the contact element 2 is applied to a high-density connector structure, the two barbs are too close to each other, so that the insulation and voltage resistance problems of the connector can be caused; and when the connector size is bigger, if still adopt the barb interference fit mode of material width direction, stress release after the assembly can let the warpage of whole connector more serious, and the coplanarity of tin ball 3 is more difficult to control.

As shown in fig. 1-3-1 to 1-3-4, the insulator 1 is generally produced by injection molding, the warp deformation of the small-sized insulator is less pronounced, but when the insulator becomes larger in size and the requirement for warp deformation of the insulator is higher, the structural member warps with a different shrinkage ratio in each direction because the shrinkage in the flow direction is greater than that in the vertical direction at the time of plastic molding; and the insulator is seriously warped to influence the use because the warping is caused by the inevitable large internal stress remained in the structural part during injection and mold filling.

As shown in fig. 1-5-1, the solder balls 3 at the tail of the electrical connector are directly soldered to the pads on the PCB by reflow soldering. When the solder balls 3 at the tail part are not consistent in height, problems such as insufficient solder are easily caused when the solder balls are soldered with a circuit board.

Disclosure of Invention

The invention provides an electric connector, a manufacturing method thereof and a tool, aiming at the technical problem that the connector cannot be accurately assembled.

The purpose of the invention is realized by adopting the following technical scheme. According to the electric connector provided by the invention, the electric connector comprises an insulator, a contact element and a tin ball, wherein a process groove for enabling the wall thickness of each part of the insulator to be uniform is formed in the insulator, an interference part which is tilted in the material thickness direction of the contact element is arranged in a linear area of the contact element, the interference part is in interference fit with an insertion hole in the insulator in the material thickness direction, through grooves are formed in the edge end faces of the shorter edges of the insulator, and the through grooves are symmetrically formed in the two end faces of the insulator.

Furthermore, a plurality of ribs are distributed on the front surface of the insulator, and the contact piece is inserted in the two side parts of the ribs.

Further, the process groove is formed in the edges of the front surface and the back surface of the insulator and on each rib.

Furthermore, the contact element further comprises a contact area and a pin area which are respectively positioned at two ends of the linear area, and the interference position is close to the pin area.

Furthermore, the through groove penetrates through the insulator, and the front and back projection shapes of the insulator are the same and are rectangular.

Furthermore, the insertion holes in the insulator are arranged in rows, protrusions II are arranged between each row of insertion holes in the back of the insulator, and the end faces of the ends of the protrusions II are not flush with the end faces of the insulator.

The electric connector comprises a contact element and an insulator, wherein the contact element comprises a linear area and a pin area, the top of the linear area, which is close to the pin area, is provided with a shoulder, the contact element is manufactured by stamping, the insulator is manufactured by injection molding, a tool is further used in the method, press shoulders are distributed on the tool, and all the press shoulders are coplanar, and the method comprises the following steps:

(1) pre-inserting: the contact element is pre-inserted into the insertion hole on the insulator, and after pre-insertion, the shoulder on the contact element is higher than the bottom plane of the insulator;

(2) and loading the tool: after pre-insertion, the press shoulders correspond to the shoulders on the contact element one by one, and the press shoulders are contacted with the corresponding shoulders;

(3) and finally inserting: and pressing the tool at preset pressure, speed and duration, applying force to the shoulder on the contact by the tool to enable the contact to be inserted into the insulator continuously, and enabling pad surfaces on all the contacts on the connector to be coplanar after the contact is inserted.

Further, when the contact element is stamped, stamping an interference part at a position, close to the pin area, on the linear area, wherein the stamping direction is the material thickness direction of the contact element; during pre-insertion and final insertion, the interference part is in interference fit with the insertion hole in the insulator in the material thickness direction.

Furthermore, when the insulator is subjected to injection molding, through grooves are formed in the end face of the edge of the shorter side of the insulator in an injection molding mode, the formed through grooves are symmetrically arranged on the two end faces of the insulator and penetrate through the insulator, and the projection shapes of the through grooves on the front face and the back face of the insulator are the same.

Furthermore, when the insulator is subjected to injection molding, the insulator is subjected to injection molding to form distributed process grooves, so that the wall thickness of each part of the insulator is equal.

Furthermore, during the injection molding of the insulator, the insertion holes formed by injection molding are arranged in rows, a protrusion II is formed between the two rows of insertion holes by injection molding, the end face of the end part of the formed protrusion II is not parallel to the end face of the insulator, and the glue leakage is avoided during injection molding.

A tooling used in the manufacturing method of an electric connector is disclosed, wherein the electric connector is the electric connector and comprises a bottom block, a pressing block and a tooling guide post, wherein the bottom block is used for placing the connector and is in contact with the front surface of an insulator; the tool guide post is arranged with any one of the bottom block or the pressing block in a sliding manner.

Further, the pressing block comprises a top plate, a pressing head plate is arranged in the middle of the bottom of the top plate, a groove is formed in the middle of the bottom of the pressing head plate, mounting holes are formed in the bottom of the groove, pressing shoulders are mounted in the mounting holes, and the distribution positions of the pressing shoulders correspond to the distribution positions of shoulders on the contact element.

Further, the bottom block comprises a bottom plate, a positioning plate is arranged in the middle of the upper surface of the bottom plate, a groove is formed in the middle of the upper surface of the positioning plate, a product base plate is arranged at the bottom of the groove, grooves are formed in the product base plate, ribs on the insulator correspond to the groove positions in the product base plate, and when the connector is placed on the product base plate, the ribs abut against the bottom of the groove of the product base plate.

Furthermore, the two tool guide posts are arranged at two ends of the pressing block and the bottom block respectively.

Compared with the prior art, the invention has the advantages that:

1. a large number of process grooves are added in the insulator, so that the wall thickness of each part of the insulator is uniform as much as possible, and the phenomenon of overlarge warping deformation is avoided.

2. The interference part is arranged in the material thickness direction of the contact piece, and by the structure, on one hand, the interference in the material width direction is not needed, so that the gap between the contact pieces is increased, on the other hand, the requirement that the contact pieces need to be fixed on the insulator is also met, and after the stress is released, the contact pieces cannot warp.

3. The manufacturing method of the electric connector ensures that the coplanarity of all pad surfaces after final pressing reaches the design standard and meets the requirements of products.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1-1 is a front view of a prior art electrical connector;

FIG. 1-2 is a left side view of FIG. 1-1;

FIG. 1-3-1 is a perspective view of the insulator of FIG. 1-1 with the back portion facing outward;

1-3-2 is an enlarged view at A in FIG. 1-3-1;

FIGS. 1-3-3 are perspective views of the insulator of FIGS. 1-1;

FIGS. 1-3-4 are perspective views of the insulator of FIG. 1-1 from another perspective;

1-4-1 is a perspective view of the contact of FIG. 1-1;

FIGS. 1-4-2 are perspective views of another form of the contact of FIGS. 1-1;

FIGS. 1-4-3 are front views of another form of the contact of FIGS. 1-1;

FIGS. 1-4-4 are perspective views of another form of the contact of FIGS. 1-1;

FIG. 1-5-1 is a front partial view of FIG. 1-1;

FIGS. 1-5-2 are partial views of the insulator of FIGS. 1-5-1;

FIG. 2-1 is a rear view of an electrical connector of the present invention;

FIG. 2-2 is a front view of FIG. 2-1;

2-3 are enlarged schematic views at B in FIGS. 2-2;

FIGS. 2-4 are enlarged schematic views at C of FIGS. 2-2;

fig. 2-5 is a perspective view of the insulator of fig. 2-1 with the back side facing outward;

FIGS. 2-6 are enlarged schematic views at D of FIGS. 2-5;

fig. 2-7 is a front outward perspective view of the insulator of fig. 2-1;

fig. 2-8 are front views of the insulator of fig. 2-1;

FIGS. 2-9 are enlarged views at E of FIGS. 2-8;

2-10 are perspective views of the contact of FIG. 2-1;

2-11 are front views of the contact of FIG. 2-1;

FIGS. 2-12 are top views of the contact of FIG. 2-1;

FIG. 2-13 is a side partial view of FIG. 2-1;

FIG. 3-1 is a perspective view of an embodiment of a tooling structure in a method for manufacturing an electrical connector according to the present invention;

FIG. 3-2 is a perspective view of the bottom of the press block of FIG. 3-1, facing outward;

FIG. 3-3 is an enlarged schematic view at F of FIG. 3-1;

fig. 3-4 is a top view of the bottom block of fig. 3-1.

[ reference numerals ]

1-insulator, 101-projection I, 102-positioning column, 103-guiding groove, 104-guiding column, 105-rib, 106-groove I, 107-groove II, 108-hole I, 109-hole II, 110-avoiding area I, 111-avoiding area II, 112-fixing area, 113-through groove, 114-projection II, 115-process groove, 116-avoiding area III, 2-contact element, 201-signal pin, 202-grounding pin, 203-contact area, 204-straight line area, 205-pin area, 206-connecting rib, 207-barb, 208-pit, 209-crack-stop groove, 210-pad surface, 211-bump, 212-interference position, 213-shoulder, 214-tear position, 215-groove, 3-tin ball, 401-measuring basis I, 402-measuring basis II, 403-measuring basis position I, 404-measuring basis position II, 405-basis X, 406-basis Y, 501-pressing block, 50101-top plate, 50102-pressing head plate, 50103-pressing shoulder, 502-tooling guide column, 503-bottom block, 50301-bottom plate, 50302-positioning plate, 50303-product backing plate and 50304-limiting block.

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.

As shown in fig. 1-1 to fig. 1-5-2, the electrical connector of the prior art includes an insulator 1, a contact 2, and solder balls 3, wherein the contact 2 includes signal pins 201 and ground pins 202, the insulator 1 is a rectangular plate, the length direction of the insulator 1 is a first direction, the width direction of the insulator is a second direction, the plugging surface of the electrical connector is a front surface, the other surface of the electrical connector is a back surface, the contact mating portion of the contact and the contact of the other electrical connector is a head portion, and the other end of the contact is a tail portion. Solder balls 3 are soldered to the tail ends of the contacts. The outer contour of the insulator 1 is generally used as a measurement reference, i.e. the longer side of the insulator 1 is used as a measurement reference I401, and the shorter side of the insulator 1 is used as a measurement reference II 402. The contact element 2 is formed by cutting a material belt with a certain thickness, the direction parallel to the surface of the material belt of the contact element 2 formed by cutting is the material width direction, and the direction parallel to the thickness direction of the material belt is the material thickness direction.

As shown in fig. 1-1 to fig. 1-2, a signal pin 201 and a ground pin 202 are inserted into an insulator 1, the signal pin 201 and the ground pin 202 form a plurality of rows of arrays, each row of arrays is parallel to a first direction, and the signal pins 201 and the ground pins 202 of each row of arrays are distributed at intervals. S represents the signal pin 201, G represents the ground pin 202, and the distribution rule of the signal pins 201 and the ground pins 202 in each row queue is: G-G-S-S-G-G- … …. Solder balls 3 are welded at the tail parts of the signal pins 201 and the grounding pins 202, and the solder balls 3 are in contact with a PCB, heated and cooled to realize the conduction connection between the signal pins 201 and the PCB.

As shown in fig. 1-3-3 to fig. 1-3-4, the longer edge of the front surface of the insulator 1 is provided with a guide groove 103 and a guide post 104 for inserting another electrical connector. The longer edge of the back side of the insulator 1 is provided with a positioning post 102, and a positioning post 103 plays a positioning role in mounting the electrical connector on a PCB. The front surface of the insulator 1 is provided with a plurality of ribs 105 extending in the first direction. Grooves are formed in both sides of the rib 105 in the first direction, the groove into which the signal pin 201 is inserted is a groove I106, and the groove into which the ground pin 202 is inserted is a groove II 107.

As shown in fig. 1-5-2, the bottoms of the grooves I106 and II107 and the insulator 1 at the corresponding positions are provided with insertion holes penetrating the insulator 1, the hole corresponding to the groove I106 is a hole I108, and the hole corresponding to the groove II107 is a hole II 109. The hole I108 and the hole II109 are divided into a fixed area 112, a clearance area I110 and a clearance area II111 in the penetrating direction, the clearance area I110 is positioned at the bottom of the corresponding groove I106 or groove II107, the fixed area 112 and the clearance area I110 are positioned on the insulator 1 between the rib 105 and the rib 105, and the fixed area 112 is positioned between the clearance area I110 and the clearance area II 112. Every four adjacent holes in the same row are divided into a group, the middle two adjacent holes in the group are holes I108 for inserting corresponding signal pins 201, and the two holes on the outer side are holes II109 for inserting corresponding ground pins 202.

As shown in fig. 1-3-1 to fig. 1-3-2, a protrusion I101 is disposed on the back surface of the insulator 1 between each row of the insertion holes, the protrusion I101 extends to the edge of the insulator 1, and when the electrical connector is pressed on a PCB, the protrusion I101 increases the distance between the electrical connector and the PCB to ensure that the solder ball 8 is not flattened.

As shown in fig. 1-4-1 to 1-4-4, the contact 2 includes a contact region 203, a linear region 204, and a pin region 205. The contact 2 is a strip-shaped plate as a whole, and the main body is a linear area 204. The contact region 203 is located at the head of the contact 2 in the direction of extension of the linear region 204 and is convex to one side. The other extending direction of the linear region 204 is a lead region 205, the lead region 205 is located at the tail of the contact element 2, the end of the contact element 2 is bent, the bent portion is the lead region 205, and the bending direction is the same as the protruding direction of the contact region 203. The straight line section 204 is provided with barbs 207 at positions close to the pin sections 205, the barbs 207 are positioned on end surfaces of both sides of the straight line section 204, and the barbs 207 are used for being clamped in the insulator 1 so as to fix the position of the contact 2. The straight line area 204 and the pin area 205 are connected by connecting ribs 206, and the number of the connecting ribs 206 is one or two. The top of the straight line area near the root of the connecting rib 206 is a shoulder 213 of the contact 2, and the shoulder 213 is provided with a crack stop groove 209 near the side end face of the connecting rib 206. The bottom surface of the lead area 205 is a pad surface 210 on which a concave 208 is disposed, or a flat surface for placing the solder ball 3.

The contact area 203 of the signal pin 201 is located in the groove I106, the contact area 203 of the grounding pin 202 is located in the groove II107, and the convex direction of the contact area 203 faces outwards and is used for being in contact conduction connection with a signal pin and a grounding pin of another electric connector. The barb 207 of the contact member is caught in the holding section 112, and the barb 207 is interference-fitted with the holding section 112 in the width direction. The lead regions 205 are located in the corresponding exclusion regions I110 and II111, and then the solder balls 3 are soldered to the lead regions 205 of the contact 2.

As shown in fig. 1-5-1, two adjacent signal pins 201 form a differential pair, the maximum width L1 between the outer sides of the contact areas 203 of the differential pair in the first direction is smaller than the maximum width L8932 of the outer sides of the contact areas of two adjacent ground pins 202 of the adjacent group in the same row in the first direction, the maximum width L3 of the outer sides of the contact areas of two adjacent ground pins 202 of the adjacent group in the partition row in the first direction is larger than the distance L2 between the contact areas of two adjacent ground pins 202 in the first direction, and the projection of the outer sides of the contact areas of two adjacent signal pins 201 in the second direction falls within the range of the outer sides of the contact areas of two ground pins 202 of the partition row.

In the above prior art, the measurement references I401 and II402 in fig. 1-1 to 1-2 are the common measurement references selected at present, but the insulator is a large-sized thin-walled insulator, and buckling deformation inevitably occurs during manufacturing, so that the reference is unstable, and erroneous judgment of a measurer may be caused due to the problem of the reference itself.

In the present invention, fig. 2-1 to fig. 2-4 show the measurement reference selection manner of the present invention. On the basis of the prior art, through grooves 113 are respectively arranged at two side parts of the insulator 1, and the through grooves 113 are opened on the end surfaces of shorter sides of the insulator and are rectangular. The left through groove 113 is used as a measurement reference position I403, the right through groove 113 is used as a measurement reference position II404, the two through grooves 113 are symmetrical with respect to the center line of the insulator 1, the connecting line of the center lines of the two through grooves 113 is a reference X405, and the reference perpendicular to the reference X405 is a reference Y406. The through grooves 113 penetrate the insulator 1, and have the same shape as the front and back surfaces of the insulator 1, and are rectangular. The size of the position of the measuring reference is well controlled and stable, and when the front side and the back side of the electric connector are detected, the reference is unified, so that the electric connector is more convenient to detect.

Fig. 1-3-1 to 1-3-2 show a manner of disposing a protrusion I101 on the back surface of an insulator 1 in the prior art, where the protrusion I101 extends to an edge of the insulator 1, and when a mold is used for production, a joint between an upper mold core and a lower mold core of the mold is at the edge, which is prone to glue leakage, resulting in poor appearance of a product.

Fig. 2-5 to fig. 2-6 show the arrangement of the protrusion according to the present invention, in which the protrusion I101 is shortened on the basis of the prior art to form the protrusion II114 shown in fig. 2-6, and two end surfaces of the protrusion II114 are spaced from two end surfaces of the insulator 1 in the first direction by a certain distance. When the mold is produced, the protrusion II114 is not arranged at the edge, the glue running risk is small, and the appearance and the quality of the product are good.

Fig. 1-4-1 to fig. 1-4-4 show the structure of a contact element in the prior art, in which the contact element 1 as a whole is in interference fit with a corresponding insertion hole on an insulator in the material width direction, that is, the maximum outer diameter of the barb 207 is in interference fit with the maximum inner diameter of the fixing area 112 on the insertion hole. When the structure is applied to a high-density connector structure, the two barbs 207 are too close to each other, so that the insulation and voltage resistance problems of the connector are caused; moreover, when the size of the connector is larger, if the barbs 207 in the material width direction are still adopted for interference, the warping of the whole connector is more serious due to stress release after assembly, and the coplanarity of the solder balls is more difficult to control.

Fig. 2-6 show the structure of the contact element of the present invention, which changes the interference of the existing contact element in the material width direction into the interference in the material thickness direction, i.e. the interference of the barb 207 into the interference in the material thickness direction. In the present embodiment, an interference portion 212 generated by puncturing is provided at the position of the barb 207 in the prior art, the puncturing direction on the contact element 2 is the material thickness direction, and after puncturing, the interference portion 212 is tilted to the material thickness direction and can be stuck in the fixing area 112. According to the structure, on one hand, interference in the material width direction is not needed, so that the gap between the contact pieces 2 is increased, on the other hand, the requirement that the contact pieces 2 need to be fixed on an insulator is met, and warping cannot occur after stress is released.

As shown in fig. 2 to 13, two side surfaces of the linear region 204 near the middle position are respectively provided with a salient point 211, and the salient points 211 are symmetrically arranged on two side end surfaces of the linear region 204 and are used for being positioned in the insertion hole of the insulator 1, so as to prevent the contact element 2 from shaking, increase reliability, ensure that the contact element 2 can be centered in the insertion hole when the contact element 2 is inserted into the insertion hole of the insulator 1, and prevent the occurrence of pin dropping problem when the connector is inserted.

Fig. 1-3-1 to fig. 1-3-4 show the structure of the insulator in the prior art, the insulator 1 is usually produced by injection molding, the warp deformation of the insulator with small size is not obvious, but when the insulator becomes bigger and the requirement for the warp deformation of the insulator is higher, the shrinkage in the flowing direction is larger than that in the vertical direction when the plastic is molded, so that the structural part warps with different shrinkage ratios; and the insulator is seriously warped to influence the use because the warping is caused by the inevitable large internal stress remained in the structural part during injection and mold filling.

Fig. 2-5 to 2-8 show the structure of the insulator 1 according to the present invention, which adds a large number of process grooves 105 to the existing insulator 1, so that the wall thickness of the insulator is as uniform as possible, and the insulator is prevented from being warped and deformed too much. In the present embodiment, the process groove 105 is provided on the edge of both the front and back surfaces of the insulator 1 and the rib 105.

As shown in fig. 1-2, the solder balls 3 at the tail of the connector are directly soldered to the pads on the PCB by reflow soldering. When the solder balls 3 at the tail part are not consistent in height, problems such as insufficient solder are easily caused when the solder balls are soldered with a circuit board.

The invention adopts a manufacturing method of an electric connector with consistent height of a bonding pad to avoid the occurrence of insufficient soldering, and the specific steps are as follows:

s1, designing the structure of the insulator 1: on the premise of meeting the use requirements of products, the structure of the insulator 1 is analyzed through simulation analysis, the positions with inconsistent wall thicknesses are determined, and in order to make the wall thicknesses uniform, the positions and the shapes of the process grooves 105 and the positions and the shapes of the through grooves 113 serving as measurement references are determined;

s2, processing: the insulator 1 in the invention is manufactured through an injection molding process, and the contact 2 in the invention is produced through a stamping process;

s3, needle mounting: pre-inserting the contact 2 into the corresponding insertion hole of the insulator 1, so that the shoulder 213 of the contact 2 is higher than the bottom plane of the insulator 1;

s4, designing and producing a pressing tool according to the arrangement position and the shape of the contact elements 2;

s5, final pressure: the position of a press shoulder 50103 used for pressing the shoulder 213 on the tool corresponds to the position of the shoulder 213 of the contact element 2, all the press shoulders 50103 are ensured to correspond to the position of the shoulder 213 of the contact element, and a press or other devices are used for applying force to the tool.

When the contact element 2 is stamped by adopting a stamping process, an interference part 212 is arranged at the position, close to the pin area 205, of the linear area 204 of the contact element 2, and when the contact element 2 is pre-inserted on the insulator 1, the interference part 212 is in interference fit with an insertion hole in the insulator 1 in the material thickness direction.

When the insulator 1 is designed, the short edge end faces of the insulator 1 are respectively provided with a through groove 113, and the through grooves 113 are symmetrically arranged on the two end faces of the insulator 1.

The through grooves 113 penetrate the insulator 1, and have the same front and rear projection shapes on the insulator 1, and are rectangular.

The inserting holes in the insulator 1 are arranged in rows, when the insulator 1 is designed, the protrusions II114 are arranged between every two rows of inserting holes, the end faces of the end portions of the protrusions II114 are not parallel and level to the end faces of the insulator 1, and glue leakage is avoided when injection molding is guaranteed.

The tooling in the manufacturing method of the electric connector with the consistent height of the bonding pads is shown in fig. 3-1 to fig. 3-4, and comprises a bottom block 503, a pressing block 501 and a tooling guide column 502. The whole bottom block 503 and the whole pressing block 501 are rectangular plates, the pressing block 501 is located above the bottom block 503, the tool guide columns 502 are arranged between the pressing block 501 and the bottom block 503, the tops of the tool guide columns 502 are arranged at the bottoms of the pressing block 501, the bottoms of the tool guide columns are arranged at the tops of the bottom block 503, and the total number of the tool guide columns 502 is two, and the tool guide columns are respectively arranged at two ends of the pressing block 501 and the two ends of the bottom block 503.

The bottom block 503 comprises a bottom plate 50301, a positioning plate 50302, a product backing 50303 and a limiting block 50304. One end of the tool guide column 502 is arranged on the bottom plate 50301, a positioning plate 50302 is arranged in the middle of the upper surface of the bottom plate 50301, the longer edge end face of the positioning plate 50302 is flush with the edge end face of the bottom plate 50301, a groove is arranged in the middle of the positioning plate 50302, a product cushion plate 50303 for placing the pre-inserted electric connector is arranged at the bottom of the groove, a plurality of grooves are arranged on the upper surface of the product cushion plate 50303, the front face of the connector is placed on the product cushion plate 50303, the ribs 105 on the insulator 1 correspond to the grooves on the product cushion plate 50303 in position, and when the front face of the connector is placed on the product cushion plate 50303, the ribs 105 on the insulator 1 just abut against the bottoms of the grooves on the product cushion plate 50303. One side of the positioning plate 50302 is provided with two limiting blocks 50304, the two limiting blocks 50304 are arranged on the same side of the positioning plate 50302, the limiting blocks 50304 are slidably arranged on the positioning plate 50302, one end of each limiting block 50304 extends into a groove in the positioning plate 50302, the other end of each limiting block 50304 is positioned on the outer side of the positioning plate 50302, and after the connector is placed in place, the limiting blocks 50304 are pushed, so that one end of the inner side of each limiting block 50304 is pressed on the outer side wall of the insulator 1, and the connector is fixed.

The briquette 501 includes a top plate 50101, a head plate 50102, and a shoulder 50103. The other end of the tool guide column 502 is arranged on the top plate 50101, a pressure head plate 50102 is arranged in the middle of the lower surface of the top plate 50101, and the edge end face of the longer side of the pressure head plate 50102 is flush with the edge end face of the top plate 50101. The middle position of the pressure head plate 50102 is provided with a groove, the bottom of the groove is distributed with mounting holes for mounting the pressure shoulders 50103, the distribution of the pressure shoulders 50103 at the bottom of the groove corresponds to the distribution of the shoulder 213 of the contact 2 on the connector, and the pressure shoulders 50103 are in the shape of a cylinder. When the connector is placed on the bottom block 503, the press block 501 moves downward, and each press shoulder 50103 presses against its corresponding shoulder 213, while the press shoulder 50103 does not contact other parts of the connector. The press block 501 is connected to a press or other device, in this embodiment a pneumatic press, which applies a force to the tool. When press 501 is against bottom block 503, press shoulder 50103 pushes shoulder 213 just flush with the bottom plane of insulator 1.

The tool guide column 502 and one of the bottom block 503 or the pressing block 501 are arranged in a sliding manner, and are fixedly arranged with the other, and under the action of force, the pressing block 501 or the bottom block 503 arranged in a sliding manner with the tool guide column 502 and the tool guide column 502 are displaced in an opposite direction, so that the contact 2 is pressed.

As shown in fig. 1-5-1 to fig. 1-5-2, in the prior art, when the contact 2 is assembled on the insulator 1, the contact 2 is directly pressed into place from the back of the insulator 1, so that the avoiding regions I110 and II111 are required to be arranged at corresponding positions on the insulator 1. The disadvantage of this configuration is that the insertion holes in the contact 2 and the insulator 1 are of similar size, and the contact 2 is prone to skewing during assembly or the contact 2 is prone to becoming lodged in the clearance area of the insulator 1 during mating of two connectors.

In the present invention, as shown in fig. 2-8 to fig. 2-9, the present invention adopts a specific assembly manner, the insulator is improved on the basis of the prior art, only one avoidance area, such as the avoidance area III116 shown in fig. 2-9, is reserved, and the avoidance area III116 is enlarged on the basis of the original avoidance area II111, so as to ensure that one avoidance area III116 can still be smoothly inserted with the contact 2. The contact element 2 and the inner wall binding surface of the insertion hole of the insulator 1 are not provided with avoidance areas, so that the product state is more stable, and the reliability is higher.

As shown in fig. 1 to 4 to 3, the conventional contact 2 has crack stop grooves 209 on both sides of the bent portion, which has a disadvantage that the requirement for impedance uniformity becomes higher as the frequency of the connector becomes higher, but when the structure is applied to a contact of a high-speed product, the impedance is not uniform due to abrupt change of the width of the contact, thereby causing the SI (signal integrity) performance to be poor.

In the invention, as shown in fig. 2-10, at the position of the crack-stopping groove 209 of the original contact element 2, the part which should be cut off originally is reserved, and the part is modified by adopting a tearing mode, as shown in fig. 2-10, at the position of the shoulder 213 of the contact element 2 close to the connecting rib 206, the part is torn towards the extending direction of the linear area 204, and the tearing depth is more than or equal to 1 time of the material thickness. The structure can avoid impedance mutation, so that the product performance is better.

In the prior art, when the pad surface 210 of the contact element 2 and the body of the contact element 2 are not in the same plane or are perpendicular to each other, the two are connected by a connecting rib 206, and the connecting rib 206 is generally of the same width, which has the advantages of simple structure and easy manufacturing process, and has the disadvantage that when the structure is applied to the contact element of a high-speed product, the impedance is inconsistent because of the abrupt change of the width of the contact element, thereby causing the si (signal integrity) performance to be poor.

In the present invention, a groove 215 is added on each side of the connecting rib 206 in the prior art, and the groove 215 is close to the pin area 205. The advantages of this structure are: the tin ball is prevented from climbing, so that the tin ball forms a round and regular contact region with a larger area on the pad surface 210 of the contact element 2, and the bonding force is large and uniform. Secondly, the contact area between the solder ball 3 and the pad surface 210 is increased, and the bonding force is increased.

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

Claims

1. An electric connector comprises an insulator (1), a contact (2) and a solder ball (3), and is characterized in that: the insulator (1) is provided with a process groove (115) enabling the insulator (1) to be uniform in wall thickness everywhere, an interference part (212) tilting in the material thickness direction is arranged on a straight line area (204) of the contact element (2), the interference part (212) is in interference fit with a plug-in hole in the insulator (1) in the material thickness direction, a through groove (113) is formed in the end face of the edge of the shorter edge of the insulator (1), and the through groove (113) is symmetrically formed in two end faces of the insulator (1).

2. An electrical connector as defined in claim 1, wherein: a plurality of ribs (105) are distributed on the front surface of the insulator (1), and the contact pieces (2) are inserted into two side parts of the ribs (105).

3. An electrical connector as defined in claim 2, wherein: the process groove (115) is formed on the edges of the front surface and the back surface of the insulator (1) and on each rib (105).

4. An electrical connector as defined in claim 1, wherein: the contact element (2) further comprises a contact area (203) and a pin area (205) which are respectively located at two ends of the linear area (204), and the interference part (212) is close to the pin area (205).

5. An electrical connector as defined in claim 1, wherein: the through grooves (113) penetrate through the insulator (1), and the front and back projection shapes of the insulator (1) are the same and are rectangular.

6. The electrical connector of any one of claims 1-5, wherein: the plug-in mounting holes in the insulator (1) are arranged in rows, protrusions II (114) are arranged between every two rows of plug-in mounting holes in the back of the insulator (1), and the end faces of the ends of the protrusions II (114) are not flush with the end faces of the insulator (1).

7. A method for manufacturing an electrical connector, the electrical connector comprising a contact (2) and an insulator (1), the contact (2) comprising a linear region (204) and a pin region (205), the linear region (204) having a shoulder (213) near the top of the pin region (205), the method comprising: the contact (2) is made by stamping, the insulator (1) is made by injection molding, the method also uses a tool, pressing shoulders (50103) are distributed on the tool, and all the pressing shoulders (50103) are coplanar, and the method comprises the following steps:

(1) pre-inserting: the contact element (2) is pre-inserted into an insertion hole on the insulator (1), and after pre-insertion, the shoulder on the contact element (2) is higher than the bottom plane of the insulator (1);

(2) and loading the tool: after pre-insertion, the press shoulders (50103) correspond to the shoulders (213) on the contact element (2) one by one, and the press shoulders (50103) are in contact with the corresponding shoulders (213);

(3) and finally inserting: the tool is pressed at preset pressure, speed and duration, meanwhile, the tool applies force to the shoulder on the contact (2), so that the contact (2) is continuously inserted into the insulator (1), and after the insertion is finished, pad surfaces on all the contacts (2) on the connector are coplanar.

8. The method of manufacturing an electrical connector of claim 7, wherein: when the contact element (2) is punched, an interference part (212) is punched at a position, close to the pin area (205), on the linear area (204), wherein the punching direction is the material thickness direction of the contact element (2); during pre-insertion and final insertion, the interference part (212) is in interference fit with the insertion hole in the insulator (1) in the material thickness direction.

9. The method of manufacturing an electrical connector of claim 7, wherein: when the insulator (1) is subjected to injection molding processing, through grooves (113) are formed in the short edge end face of the insulator (1) in an injection molding mode, the formed through grooves (113) are symmetrically arranged on the two end faces of the insulator (1) and penetrate through the insulator (1), and the projection shapes of the through grooves (113) on the front face and the back face of the insulator (1) are the same.

10. The method of manufacturing an electrical connector of claim 7, wherein: when the insulator (1) is subjected to injection molding processing, the distributed process grooves are formed in the insulator (1) in an injection molding mode, and the wall thickness of each part of the insulator (1) is equal.

11. The method of manufacturing an electrical connector of claim 7, wherein: during injection molding of the insulator (1), insertion holes formed by injection molding are arranged in rows, a protrusion II (114) is formed between two rows of insertion holes in the same injection molding mode, the end face of the end part of the formed protrusion II (114) is not parallel to the end face of the insulator (1), and glue leakage is avoided during injection molding.

12. The utility model provides a frock for electric connector makes which characterized in that: the electric connector is as claimed in any one of claims 1 to 6, the tool comprises a bottom block (503) used for placing the connector and contacting with the front surface of the insulator (1), a pressing block (501) used for pressing the shoulder (213) on the contact piece (2), and a tool guide column (502), wherein two ends of the tool guide column (502) are respectively arranged on the upper surface of the bottom block (503) and the lower surface of the pressing block (501); the tool guide column (502) is arranged with any one of the bottom block (503) or the pressing block (501) in a sliding manner.

13. The tooling used in the method for manufacturing an electrical connector according to claim 12, wherein: the pressing block (501) comprises a top plate (50101), a pressing head plate (50102) is arranged in the middle of the bottom of the top plate (50101), grooves are formed in the middle of the bottom surface of the pressing head plate (50102), mounting holes are formed in the bottoms of the grooves, pressing shoulders (50103) are mounted in the mounting holes, and the distribution positions of the pressing shoulders (50103) correspond to the distribution positions of shoulders (213) on the contact element (2).

14. The tooling used in the method for manufacturing an electrical connector according to claim 12, wherein: the bottom block (503) comprises a bottom plate (50301), a positioning plate (50302) is arranged in the middle of the upper surface of the bottom plate (50301), a groove is arranged in the middle of the upper surface of the positioning plate (50302), a product backing plate (50303) is arranged at the bottom of the groove, grooves are distributed in the product backing plate (50303), ribs (105) on the insulator (1) correspond to the positions of the grooves in the product backing plate (50303), and when the connector is placed on the product backing plate (50303), the ribs (105) abut against the bottoms of the grooves in the product backing plate (50303).

15. The tooling used in the method for manufacturing an electrical connector according to claim 12, wherein: the two tooling guide columns (502) are arranged and are respectively arranged at two ends of the pressing block (501) and the bottom block (503).