CN218744154U

CN218744154U - Stamping processing die for lead frame

Info

Publication number: CN218744154U
Application number: CN202223342122.8U
Authority: CN
Inventors: 史庄; 康征
Original assignee: Shijiazhuang Hengrong Shitong Electronic Technology Co ltd
Current assignee: Shijiazhuang Hengrong Shitong Electronic Technology Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-03-28
Anticipated expiration: 2032-12-12

Abstract

The utility model provides a lead frame stamping processing die, which comprises a lower die holder, a female die, an upper die holder, a pressing plate and a male die; the female die is arranged on the lower die base and is provided with a plurality of forming grooves; the upper die base is arranged above the lower die base; the pressing plate is arranged on the upper die base, an elastic piece is connected between the pressing plate and the upper die base, a plurality of through holes are formed in the pressing plate, and the through holes correspond to the forming grooves one to one; the male die is arranged on the upper die base and provided with a plurality of forming blocks, the forming blocks correspond to the through holes one by one and are in sliding fit, and the forming blocks are used for extending out of the through holes and being matched with the forming grooves when the upper die base moves downwards. The utility model provides a stamping processing die for lead frames, which realizes the stamping and bending of single multi-group lead frames by one set of die, thus accelerating the stamping efficiency; the pressing plate and the female die are matched to clamp the lead frame to guide the forming block to be aligned with the female die, so that the stamping precision is improved.

Description

Stamping processing die for lead frame

Technical Field

The utility model belongs to the technical field of electronic component makes, concretely relates to lead frame stamping die.

Background

The lead frame is used as a chip carrier of an integrated circuit, is a key structural member for realizing the electrical connection between a leading-out end of an internal circuit of a chip and an external lead by means of bonding materials (gold wires, aluminum wires and copper wires) to form an electrical circuit, plays a role of a bridge Liang Zuoyong connected with an external lead, needs to use the lead frame in most semiconductor integrated blocks, and is an important basic material in the electronic information industry.

The bending angles of the leads at the two ends of each row of leads and other leads of the existing lead frame are different, so that a plurality of sets of dies are usually required to process the lead frame during bending and forming, the processing of the forming groove of the die is difficult, and the processing precision is low. The non-molding area of the lead frame is easy to deform during processing, and the production cost is increased. In addition, the die can only process a single lead frame once, and the processing efficiency is low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a lead frame stamping die aims at carrying out the simultaneous processing of a plurality of lead frames through one set of mould, improves machining efficiency.

In order to achieve the above object, the utility model adopts the following technical scheme: provided is a lead frame stamping die, including:

a lower die holder;

the female die is arranged on the lower die base and is provided with a plurality of forming grooves;

the upper die holder is arranged above the lower die holder and is used for moving along the up-and-down direction;

the pressing plate is arranged on the upper die base, an elastic piece is connected between the pressing plate and the upper die base, a plurality of channels are formed in the pressing plate, and the channels correspond to the forming grooves one by one; and

the male die is arranged on the upper die base and provided with a plurality of forming blocks, the forming blocks correspond to the channels one to one and are in sliding fit with the channels, and the forming blocks are used for extending out of the channels and being matched with the forming grooves when the upper die base goes down.

In a possible implementation manner, the bottom surface of the upper die holder is recessed to form an accommodating groove, and the pressing plate is in sliding fit with the accommodating groove;

in an initial state, the bottom surface of the pressing plate protrudes out of the notch of the accommodating groove.

In a possible implementation manner, a through hole communicated with the accommodating groove is formed in the adjacent surface of the bottom surface of the upper die holder, a limiting rod is arranged in the through hole, a limiting part matched with the limiting rod is arranged on the pressing plate, and the limiting part is used for abutting against the limiting rod when the pressing plate slides downwards to a preset position.

In a possible implementation mode, the upper die base is provided with a yielding groove, the yielding groove is located above the accommodating groove and communicated with the accommodating groove, and the top end of the elastic piece stretches into the yielding groove.

In a possible implementation manner, the lower die holder is formed with a mounting groove, the female die is fixed at the bottom of the mounting groove, and the top surface of the female die is lower than the top surface of the lower die holder.

In a possible implementation manner, the upper surface of the lower die holder is further concavely provided with a positioning groove, the depth of the positioning groove is lower than that of the mounting groove and communicated with the mounting groove, and the positioning groove is used for limiting the lead frame.

In a possible implementation manner, the upper end of the upper die holder is further provided with a die handle for connecting the upper die holder with the stamping device.

In a possible implementation manner, a guiding structure is further disposed between the lower die holder and the upper die holder, and the guiding structure includes:

the guide sleeve penetrates through the upper die base along the vertical direction; and

and the guide post is arranged on the lower die base and is in sliding fit with the guide sleeve.

In a possible implementation, the top end of the guide post forms a guide spherical surface for sliding the guide post to the guide sleeve.

In a possible implementation manner, a base is arranged at the bottom of the lower die holder, and the base is provided with a limiting groove for limiting the lower die holder in the horizontal direction.

The utility model provides a lead frame stamping die compares with prior art, at the actual forming process, arranges the whole row of lead frame in on the die to make a plurality of shaping portions and shaping groove one-to-one. In the initial state, the pressing plate protrudes out of the bottom surface of the upper die base, and the bottom surface of the forming block is higher than that of the pressing plate. The upper die base is started, the upper die base moves downwards, the pressing plate contacts the female die firstly, the whole row of frame main bodies are clamped, the elastic part is compressed along with continuous downward movement of the upper die base, the forming block on the male die gradually extends out of the channel and extrudes the lead wire until the forming block contacts with the bottom surface of the forming groove, and the one-step forming process is completed. The multi-group lead frame stamping and bending die has the advantages that stamping and bending of the multi-group lead frames are achieved through one set of die, stamping efficiency is improved, and use cost is reduced. The pressing plate and the female die are matched to clamp the lead frame, so that the deformation of a non-forming area of the lead frame is avoided, and the working quality of the die is improved; the shaping piece slides in the passageway to the passageway is corresponding one-to-one from top to bottom with the shaping groove, can guide shaping piece and shaping groove to adjust well, has improved the punching press precision.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a lead frame stamping die provided in an embodiment of the present invention;

fig. 2 is a schematic view of a three-dimensional structure of a lead frame stamping die provided in an embodiment of the present invention;

fig. 3 is a cross-sectional view of a lead frame stamping die provided in an embodiment of the present invention;

fig. 4 is a schematic perspective view of a lower die holder adopted in the embodiment of the present invention;

fig. 5 is a schematic perspective view of an upper die holder according to an embodiment of the present invention;

FIG. 6 is a front view of a lead frame;

fig. 7 is a schematic perspective view of a stamped lead frame according to an embodiment of the present invention.

Description of reference numerals:

1. a lower die holder; 11. mounting grooves; 12. positioning a groove;

2. a female die; 21. forming a groove;

3. an upper die holder; 31. accommodating grooves; 32. a through hole; 33. a yielding groove;

4. pressing a plate; 41. a channel; 42. an elastic member;

5. a male die; 51. forming a block;

6. a die shank;

7. a guide structure; 710. a guide post; 711. a guiding spherical surface; 720. a guide sleeve;

8. a base; 81. a limiting groove;

9. a lead frame; 91. a frame body; 92. a lead wire; 93. a molding part.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 7, a stamping die for lead frame according to the present invention will be described. The lead frame stamping processing die comprises a lower die holder 1, a female die 2, an upper die holder 3, a pressing plate 4 and a male die 5. The female die 2 is arranged on the lower die holder 1, and a plurality of forming grooves 21 are formed in the female die 2; the upper die holder 3 is arranged above the lower die holder 1 and is used for moving along the up-and-down direction; the pressing plate 4 is arranged on the upper die base 3, an elastic part 42 is connected between the pressing plate 4 and the upper die base 3, the pressing plate 4 is provided with a plurality of channels 41, and the channels 41 correspond to the forming grooves 21 one by one; the male die 5 is arranged on the upper die base 3, the male die 5 is provided with a plurality of forming blocks 51, the forming blocks 51 correspond to the channels 41 one by one and are in sliding fit, and the forming blocks 51 are used for extending out of the channels 41 and being matched with the forming grooves 21 when the upper die base 3 moves downwards.

It is to be understood that the lead frame 9 is composed of a frame body 91 and leads 92, and the region where the leads 92 are pressed is defined as a molding portion 93.

When the molding block 5 and the die 2 are tightly attached, the molding block 51 is positioned in the molding groove 21, and the shape of the side surface of the molding block 51 matches with the shape of the side wall of the molding groove 21. The bending of the lead 92 is achieved by pressing the side walls of the molding groove 21 and the side surfaces of the molding block 51 against the molding portion 93 of the lead frame 9.

Compared with the prior art, the lead frame stamping processing die provided by the embodiment has the advantages that the whole row of lead frames 9 are placed on the female die 2 in the actual forming process, and the forming parts 93 are in one-to-one correspondence with the forming grooves 21. In the initial state, the pressing plate 4 protrudes from the bottom surface of the upper die holder 3, and the bottom surface of the molding block 51 is higher than the bottom surface of the pressing plate 4. The upper die base 3 is started, the upper die base 3 moves downwards, the pressing plate 4 contacts the female die 2 firstly, the whole row of frame main bodies 91 are clamped, the elastic piece 42 is compressed along with continuous downward movement of the upper die base 3, the forming block 51 on the male die 5 gradually extends out of the channel 41 and extrudes the lead 92 until the forming block 51 contacts with the bottom surface of the forming groove 21, and the one-step forming process is completed. The multi-group lead frame 9 can be simultaneously stamped and bent through one set of die, so that the stamping efficiency is improved, and the use cost is reduced. The pressing plate 4 and the female die 2 are matched to clamp the lead frame 9, so that the deformation of a non-forming area of the lead frame 9 is avoided, and the working quality of the die is improved; the molding blocks 51 slide in the channels 41, and the channels 41 correspond to the molding grooves 21 one by one up and down, so that the molding blocks 51 and the molding grooves 21 can be guided to be aligned, and the stamping precision is improved.

Optionally, the elastic member 42 is a spring, which has high elasticity, good deformation continuity and low cost, and meets the requirement of being used as the elastic member 42. Of course, the elastic member 42 may be other members capable of generating elastic deformation, such as an elastic rubber block, and the like, as long as the elastic member can prevent the whole pressing plate 4 from being separated from the upper die base 3 and drive the pressing plate 4 to recover, which is not illustrated herein.

In some embodiments, referring to fig. 2 and 5, the bottom surface of upper die base 3 is recessed to form receiving groove 31, and pressing plate 4 is slidably fitted into receiving groove 31; in the initial state, the bottom surface of the pressing plate 4 protrudes from the notch of the accommodating groove 31. The lateral wall of clamp plate 4 laminating holding tank 31 slides, has realized adjusting the position of clamp plate 4 on the horizontal direction when sliding, and clamp plate 4 and die 2 are adjusted well all the time, and then can effectively press from both sides tight frame main part 92. After the pressing plate 4 is matched with the female die 2 to clamp the frame body 91, the pressing plate 4 can normally slide into the accommodating groove 31 to realize that the molding block 51 protrudes out of the pressing plate 4. The elastic member 42 can drive the pressing plate 4 to automatically recover after the die is finished, and prevent the pressing plate 4 from separating from the upper die base 3.

The accommodation groove 31 may also limit the sliding stroke of the pressure plate 4, that is, when the depth of the accommodation groove 31 increases, the sliding stroke of the pressure plate 4 also increases.

Referring to fig. 1 to 2, a through hole 32 communicated with the accommodating groove 31 is formed in an adjacent surface of the bottom surface of the upper die base 3, a limiting rod (not shown) is arranged in the through hole 32, a limiting portion (not shown) matched with the limiting rod is arranged on the pressure plate 4, and the limiting portion is used for abutting against the limiting rod when the pressure plate 4 slides downwards to a preset position. The limiting rod is inserted into the through hole 32, so that the upper end face of the pressing plate 4 is always located in the accommodating groove 31, and the pressing plate 4 cannot be separated from the upper end seat 3.

During specific implementation, a clamping groove (not shown) is formed in one side, facing the limiting rod, of the pressing plate 4, the clamping groove extends downwards to the bottom surface of the pressing plate 4, and the top of the clamping groove and the top surface of the pressing plate 4 are distributed at intervals. The tip of gag lever post stretches into the joint inslot, and when clamp plate 4 slided to extreme position downwards, the gag lever post butt was in the top in joint groove this moment, realizes spacing to clamp plate 4.

It should be noted that the axis of the through hole 32 may be parallel to the bottom surface of the upper die base 3 or form an included angle with the bottom surface of the upper die base 3, as long as the limiting rod extends into the accommodating groove 31.

In some embodiments, referring to fig. 1 and 2, the upper die base 3 is provided with a relief groove 33, an end of the elastic member 42 extends into the relief groove 33, the relief groove 33 is located above the accommodating groove 31 and is communicated with the accommodating groove 31, and a top end of the elastic member 42 extends into the relief groove 33. The receding groove 33 provides a telescopic space for the elastic member 42, so that the stroke of the pressure plate 4 in the accommodating groove 31 is increased. Through setting up the groove 33 of stepping down, still conveniently mark the mounted position of elastic component 42, make things convenient for the installation of elastic component 42, reduce intensity of labour. After the elastic member 42 is completely compressed, it can be completely disposed in the receding groove 33, or at least the bottom of the elastic member extends out of the receding groove 33 by a predetermined length, which can be determined according to the stroke of the pressing plate 4.

In some embodiments, referring to fig. 1 to 4, a mounting groove 11 is concavely formed on the top surface of the lower die holder 1, the female die 2 is fixed at the bottom of the mounting groove 11, and the top surface of the female die 2 is lower than the top surface of the lower die holder 1; mounting groove 11 has realized die 2's fixed mounting to die 2 provides the protection, avoids die

holder

1 and 3 butts of upper die base to lead to die 2 to be excessively extruded and cause the damage.

In some embodiments, referring to fig. 1 to 3, a positioning groove 12 is further concavely formed on the upper surface of the lower die holder 1, the depth of the positioning groove 12 is lower than that of the mounting groove 11 and is communicated with the mounting groove 11, and the positioning groove 12 is used for limiting the lead frame 9. Lead frame 9 installs to constant head tank 12 during specific use, and die 2 supports lead frame 9, and constant head tank 12 guarantees that lead frame 9 can not remove at stamping process, and constant head tank 12 has realized lead frame 12 location on the horizontal direction.

In some embodiments, referring to fig. 1 to 3, the upper die holder 3 is further provided with a die shank 6 for connecting the upper die holder 3 with a pressure device. The upper die holder 3 is connected with the punching equipment through the die handle 6, so that the upper die holder 3 can move along the up-and-down direction all the time. Through setting up die shank 6 to the height of adjustment die shank 6 can change the axial length that stamping equipment and die shank 6 are connected, and then has improved the stability of being connected between cope match-plate pattern 3 and the stamping equipment. The stamping equipment can be a hydraulic cylinder or a pneumatic stamping cylinder.

In some embodiments, referring to fig. 1 and 3, a guide structure 7 is further disposed between the lower die base 1 and the upper die base 3, and the guide structure 7 includes a guide post 710 and a guide sleeve 720. The guide sleeve 720 penetrates through the upper die holder 3 along the up-down direction; the guide post 710 is arranged on the lower die base 1 and is in sliding fit with the guide sleeve 720. When the upper die holder 710 moves downwards, the guide columns 710 and the guide sleeves 720 are aligned vertically, the upper die holder 3 slides along the radial directions of the guide columns 710, the upper die 5 and the female die 2 can be aligned automatically, and the stamping accuracy is improved.

An embodiment for further improving the efficiency of the docking of the guide post 710 and the guide sleeve 720 is shown in fig. 1-3. The top end of the guide post 710 forms a guide spherical surface 711, and the guide spherical surface 711 is used for sliding the guide post 710 to the guide sleeve 720. In the assembling process, the guide spherical surface 711 contacts the bottom end of the guide sleeve 720, and the guide column 710 enters the guide sleeve 720 under the guide of the guide spherical surface 711, so that the installation is convenient, and the installation time is shortened.

On the basis of the above embodiment, referring to fig. 1, the bottom of the lower die holder 1 is provided with a base 8, and the base 8 is provided with a limiting groove 81 for limiting the lower die holder 3 in the horizontal direction. On base 8 was fixed in the operation panel that stamping equipment corresponds through threaded connection spare (not marked in the figure), threaded connection spare passed through spacing groove 81 centre gripping base 8, avoided trompil on die holder 1, realized spacing to die holder 1 on the horizontal direction, guaranteed at the mould during operation, die holder 1 is fixed all the time, and upper die base 3 downstream can be adjusted well with die holder 1, guarantees that the mould can normally work. The limiting groove 81 is convenient for fixing the die on the operating platform corresponding to the stamping equipment, and the die is convenient to detach.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a lead frame stamping die which characterized in that includes:

a lower die holder;

2. The lead frame stamping and processing die of claim 1, wherein the bottom surface of the upper die base is recessed to form a receiving groove, and the pressing plate is slidably engaged with the receiving groove;

3. The stamping die for lead frames according to claim 2, wherein the adjacent surface of the bottom surface of the upper die base is provided with a through hole communicated with the accommodating groove, a limiting rod is arranged in the through hole, the pressing plate is provided with a limiting part matched with the limiting rod, and the limiting part is used for abutting against the limiting rod when the pressing plate slides downwards to a preset position.

4. The lead frame stamping die according to claim 2, wherein the upper die base is provided with a relief groove, the relief groove is located above the accommodating groove and communicated with the accommodating groove, and the top end of the elastic member extends into the relief groove.

5. The lead frame stamping processing die as claimed in claim 1, wherein the top surface of the lower die holder is recessed to form a mounting groove, the female die is fixed at the bottom of the mounting groove, and the top surface of the female die is lower than the top surface of the lower die holder.

6. The lead frame stamping processing die as claimed in claim 5, wherein the lower die holder has a recessed positioning groove formed on the upper surface thereof, the positioning groove has a depth lower than that of the mounting groove and is communicated with the mounting groove, and the positioning groove is used for limiting the lead frame.

7. The lead frame stamping and processing die of claim 1, wherein the upper end of the upper die base is further provided with a die shank for connecting the upper die base and a stamping device.

8. The lead frame stamping and processing die of claim 7, wherein a guide structure is further arranged between the lower die holder and the upper die holder, and the guide structure comprises:

9. The lead frame stamping and processing die of claim 8, wherein the top ends of the guide posts form guide spherical surfaces for sliding the guide posts to the guide sleeves.

10. The lead frame stamping processing die as claimed in claim 1, wherein a base is arranged at the bottom of the lower die base, and the base is provided with a limiting groove for limiting the lower die base in the horizontal direction.