CN114346079B

CN114346079B - Lead frame die positioning device

Info

Publication number: CN114346079B
Application number: CN202210275297.7A
Authority: CN
Inventors: 冯军民; 潘龙慧; 王李发; 林云海
Original assignee: Ningbo Dezhou Precision Electronic Co ltd
Current assignee: Ningbo Dezhou Precision Electronic Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-05-24
Anticipated expiration: 2042-03-21
Also published as: CN114346079A

Abstract

The invention provides a lead frame die positioning device which comprises a base, wherein a punching groove is formed in the base, an insertion opening communicated with the punching groove is formed in the front side of the base, two guide rods are fixedly connected in the punching groove, a lower die is inserted in the guide rods, a clamping mechanism capable of clamping the lower die is installed on the guide rods, a support is fixedly installed on the base, a socket capable of moving up and down is installed on the support, an upper die matched with the lower die is inserted in the socket, a feeding opening and a discharging opening communicated with the punching groove are formed in the left side and the right side of the base, positioning mechanisms capable of positioning copper strips with different sizes are installed in the feeding opening and the discharging opening, the bottom of the punching groove is provided with a collecting groove, and pressing plates capable of moving oppositely to press the copper into scrap materials are arranged on the two sides of the bottom of the collecting groove. The device can carry out automatic positioning to the copper strips of different bandwidth, is convenient for change the mould to can collect the copper waste material and carry out the pressfitting to it.

Description

Lead frame die positioning device

Technical Field

The invention relates to the technical field of lead frame processing, in particular to a lead frame die positioning device.

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 lead-out end of an internal circuit of a chip and an external lead by means of a bonding material to form an electrical circuit, plays a role of a bridge connected with an external lead, needs to be used in most semiconductor integrated blocks, and is an important basic material in the electronic information industry. The lead frame is mostly made of flat copper strips by stamping.

At present, an unwinding roller and a winding roller are often adopted to guide the copper strip into a stamping machine tool, but the existing stamping machine tool is lack of positioning the copper strips with different bandwidths, stamping deviation is easy to occur, and a machine tool die is not easy to replace.

Disclosure of Invention

Aiming at the problems, the invention provides a lead frame die positioning device which can automatically position copper strips with different bandwidths, is convenient for replacing dies and can collect and press copper waste materials.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a lead frame die positioning device comprises a base, wherein a stamping groove is arranged on the base, an insertion opening communicated with the stamping groove is arranged on the front side of the base, two guide rods are fixedly connected in the stamping groove, a lower die is inserted on the guide rods, a clamping mechanism capable of clamping the lower die is arranged on the guide rods, a bracket is fixedly arranged on the base, a socket capable of moving up and down is arranged on the bracket, an upper die matched with the lower die is inserted on the socket, the left side and the right side of the base are both provided with a feed inlet and a discharge outlet which are communicated with the stamping groove, the feed inlet and the discharge outlet are both internally provided with a positioning mechanism which can position copper strips with different sizes, the bottom of the punching groove is provided with a collecting groove, both sides of the bottom of the collecting groove are provided with pressing plates which can move oppositely to press the copper waste, and a material pushing mechanism capable of pushing the copper waste materials pressed by the pair of pressing plates out of the collecting tank is arranged on the front side of the base.

Preferably, the front side of socket is equipped with the slot, the both sides of slot all are equipped with the spout, the both sides of going up the mould all are equipped with the picture peg that inserts in the spout, the both sides of socket all are equipped with a plurality of bolts with picture peg threaded connection.

Preferably, two hydraulic cylinders are installed at the top of the support, and the telescopic ends of the two hydraulic cylinders are fixedly connected with the socket.

Preferably, the positioning mechanism comprises a conductive assembly and two guide assemblies, the conductive assembly is installed on the front side of the feeding hole, and the two guide assemblies are respectively installed in the feeding hole and the discharging hole.

Preferably, conductive component includes a plurality of conducting strips of equidistant fixed mounting at the feed inlet top, a plurality of conducting strips set up along feed inlet width direction, the bottom elastic mounting of feed inlet have with a plurality of conducting strip one-to-one a plurality of electrically conductive balls, a plurality of conducting strips and a plurality of electrically conductive ball external power supply.

Preferably, the direction subassembly is including setting up the many bar grooves to different length at the feed inlet top, many length to the bar groove of different length increase in proper order after to in the past, and many pairs of bar inslots all have a slider through first spring elastic mounting, the bottom of slider is rotated and is connected with the leading wheel, from the back to the first spring of the bar inslot that preceding length reduced in proper order respectively with from interior to exterior a plurality of conducting strips and conductive ball electric connection.

Preferably, electrically conductive head of elasticity is installed at the top of discharge gate, the bottom of discharge gate inlay be equipped with electrically conductive first complex electrically conductive seat, electrically conductive head of elasticity and electrically conductive seat external power supply, the both sides of base all are equipped with the installation cavity, be equipped with the piston in the installation cavity, the inboard fixedly connected with connecting rod of piston, the bottom both sides of collecting vat all are equipped with the recess of placing the clamp plate, the end of connecting rod extend to in the recess and with clamp plate fixed connection, the cover is equipped with the second spring on the connecting rod, the both ends of second spring respectively with electrically conductive head of elasticity and electrically conductive seat electric connection.

Preferably, the top of the outer side of the discharge port is fixed with an air blowing pipe, the bottom of the air blowing pipe is provided with a plurality of air outlet heads, the installation cavity is connected with an air suction pipe and an air outlet pipe, the air suction pipe and the air outlet pipe are internally provided with a one-way valve, and the air outlet pipe is connected with the air blowing pipe.

Preferably, pushing equipment includes the cylinder of fixed mounting in the base front side, the flexible end of cylinder extends to in the collecting vat and fixedly connected with push pedal, the rear side of collecting vat is equipped with the export that pushes away of corresponding push pedal.

Preferably, clamping mechanism is including setting up the bar chamber in the guide bar, the bar intracavity is rotated and is connected with double threaded rod, the equal threaded connection in both sides of double threaded rod has the nut, the upper and lower both sides of nut all are equipped with the circle chamber, install the wedge through third spring elasticity in the circle chamber, the upper and lower both sides of guide bar all are equipped with the bar mouth that supplies the wedge to pass, double threaded rod's back side fixedly connected with extends the pivot of base, the terminal fixedly connected with worm wheel of pivot, the rear side of base is rotated and is connected with the worm with two worm wheel meshing, and the rear side of base is installed and is driven worm pivoted motor.

The invention has the beneficial effects that:

1. through installing positioning mechanism in feed inlet and discharge gate, the copper strips of different bandwidth are through the feed inlet, and a plurality of conducting strips and the electrically conductive ball circuit of contradicting the copper strips can switch on, and then a pair of first spring circular telegram shrink of relevant position, and a pair of leading wheel that corresponds moves back to each other makes the copper strips pass, does not contradict the conducting strip and the electrically conductive ball of copper strips, and the circuit is in the off-state, and the leading wheel position of relevant position keeps motionless, and the location is adjusted automatically to the adaptation through the bandwidth of copper strips.

2. Through installation clamping mechanism, when needing to be changed the lower mould, only need with its cartridge to two guide bars on, the starter motor drives two double threaded rod rotations simultaneously through worm and worm wheel, drives two nuts and removes in opposite directions again, and the wedge pops out the bar mouth, realizes the centre gripping location to the lower mould, and it is convenient to change, adaptable not unidimensional lower mould, go up the mould disect insertion socket in, can realize fixing through the bolt.

3. Through the installation collecting vat, the copper scrap after the punching press can fall into the collecting vat automatically, and when the copper strips that the punching press is good passed through the discharge gate, because there are more spaces on the lead frame, elasticity conductive head can intermittent type through a plurality of spaces, and then realize that the intermittent type of circuit switches on, makes second spring intermittent type shrink, drives two clamp plates and removes the waste material pressfitting in opposite directions, pushes away the mouth from pushing out through cylinder and push pedal after the pressfitting.

4. By installing the air blowing pipe, in the reciprocating movement process of the piston, air is pumped out from the air blowing pipe without stopping, and finally, the air is blown to the lead frame from a plurality of air outlet heads to blow away powder existing after stamping.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a bottom view of the feed inlet according to the present invention;

fig. 5 is a sectional view of a guide bar according to the present invention;

FIG. 6 is an enlarged view of the structure at C in FIG. 5;

FIG. 7 is a rear view of the present invention;

FIG. 8 is a front view of the present invention;

fig. 9 is a diagram of the pusher according to the present invention.

In the figure: the device comprises a base 1, a support 2, a hydraulic cylinder 3, a socket 4, a bolt 5, a slot 6, an upper die 7, a feed inlet 8, a discharge outlet 9, a stamping groove 10, a lower die 11, a guide rod 12, a collecting groove 13, a push outlet 14, a pressing plate 15, a piston 16, a mounting cavity 17, a second spring 18, a gas outlet 19, a gas blowing pipe 20, a conducting strip 21, a conducting ball 22, an elastic conducting head 23, a conducting seat 24, a strip-shaped groove 25, a sliding block 26, a first spring 27, a worm 28, a worm wheel 29, a motor 30, a cylinder 31, a plug-in opening 32, a push plate 33, a strip-shaped cavity 34, a double-threaded rod 35, a nut 36, a third spring 37, a wedge-shaped block 38, a strip-shaped opening 39 and a guide wheel 40.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1-9, a lead frame mold positioning device comprises a base 1, a stamping groove 10 is arranged on the base 1, a plug-in opening 32 communicated with the stamping groove 10 is arranged on the front side of the base 1, two guide rods 12 are fixedly connected in the stamping groove 10, lower molds 11 are inserted in the guide rods 12, clamping mechanisms capable of clamping the lower molds 11 are installed on the guide rods 12, a support 2 is fixedly installed on the base 1, a socket 4 capable of moving up and down is installed on the support 2, an upper mold 7 matched with the lower molds 11 is inserted in the socket 4, a feed inlet 8 and a discharge outlet 9 communicated with the stamping groove 10 are arranged on the left side and the right side of the base 1, positioning mechanisms capable of positioning copper strips with different sizes are installed in the feed inlet 8 and the discharge outlet 9, a collecting groove 13 is arranged at the bottom of the stamping groove 10, pressing plates 15 capable of moving oppositely to press the copper waste materials are arranged on the two sides of the bottom of the collecting groove 13, the front side of the base 1 is provided with a material pushing mechanism which can push the copper waste materials pressed by the pair of pressing plates 15 out of the collecting tank 13.

Further, the front side of socket 4 is equipped with slot 6, and the both sides of slot 6 all are equipped with the spout, and the both sides of going up mould 7 all are equipped with the picture peg that inserts in the spout, and the both sides of socket 4 all are equipped with a plurality of bolts 5 with picture peg threaded connection, go up mould 7 and change and only need insert in the slot 6 of socket 4, the picture peg inserts in the spout, realizes locking through a plurality of bolts 5.

Furthermore, two hydraulic cylinders 3 are installed at the top of the support 2, and the telescopic ends of the two hydraulic cylinders 3 are fixedly connected with the socket 4.

Further, positioning mechanism includes conductive component and two direction subassemblies, and conductive component installs in the front side of feed inlet 8, and two direction subassemblies are installed respectively in feed inlet 8 and discharge gate 9.

Specifically, conductive component includes equidistant fixed mounting at a plurality of conducting strips 21 at 8 tops of feed inlet, and a plurality of conducting strips 21 set up along 8 width direction of feed inlet, and the bottom elastic mounting of feed inlet 8 has a plurality of electrically conductive balls 22 with a plurality of conducting strips 21 one-to-one, a plurality of conducting strips 21 and a plurality of electrically conductive ball 22 external power supply.

Specifically, the direction subassembly is including setting up the strip groove 25 to different length at 8 tops of feed inlet, and the length of the strip groove 25 to different length increases in proper order after to in the past many, all has slider 26 through first spring 27 elastic mounting in the many pairs of strip grooves 25, and slider 26's bottom is rotated and is connected with leading wheel 40, from the back to preceding length reduce in proper order in the strip groove 25 first spring 27 respectively with from interior to exterior a plurality of conducting strips 21 and conductive ball 22 electric connection.

Further, the top of discharge gate 9 is installed flexible conductive head 23, the bottom of discharge gate 9 is inlayed and is equipped with and leads conductive head 23 complex conductive seat 24 with elasticity, electrically conductive head 23 of elasticity and conductive seat 24 external power source, the both sides of base 1 all are equipped with installation cavity 17, be equipped with piston 16 in the installation cavity 17, the inboard fixedly connected with connecting rod of piston 16, the bottom both sides of collecting vat 13 all are equipped with the recess of placing clamp plate 15, the end of connecting rod extend to in the recess and with clamp plate 15 fixed connection, the cover is equipped with second spring 18 on the connecting rod, the both ends of second spring 18 respectively with electrically conductive head 23 of elasticity and conductive seat 24 electric connection.

Further, the outside top of discharge gate 9 is fixed with gas blow pipe 20, the bottom of gas blow pipe 20 is equipped with a plurality of gas heads, installation cavity 17 is connected with breathing pipe and outlet duct 19, all install the check valve in breathing pipe and the outlet duct 19, outlet duct 19 is connected with gas blow pipe 20, reciprocating motion about piston 16, and then realize the pump gas process, inhale through the breathing pipe, 19 crowded into gas blow pipe 20 in the rethread outlet duct, finally blow to the lead frame through a plurality of gas heads, blow away the powder that exists after the punching press, realize the clearance process.

Specifically, pushing equipment includes cylinder 31 of fixed mounting in base 1 front side, and the flexible end of cylinder 31 extends to in the collecting vat 13 and fixedly connected with push pedal 33, and the rear side of collecting vat 13 is equipped with the ejecting opening 14 that corresponds push pedal 33, starts cylinder 31 and drives push pedal 33 and remove after the pressfitting, pushes out the waste material of pressfitting from ejecting opening 14.

Specifically, clamping mechanism is including setting up the bar chamber 34 in guide bar 12, bar chamber 34 internal rotation is connected with double threaded rod 35, the equal threaded connection in both sides of double threaded rod 35 has nut 36, the upper and lower both sides of nut 36 all are equipped with the circle chamber, there is wedge 38 through third spring 37 elastic mounting in the circle chamber, the upper and lower both sides of guide bar 12 all are equipped with the bar mouth 39 that supplies wedge 38 to pass, the rear end fixedly connected with of double threaded rod 35 extends base 1's pivot, the terminal fixedly connected with worm wheel 29 of pivot, base 1's rear side rotation is connected with the worm 28 with two worm wheel 29 meshing, can drive worm 28 pivoted motor 30 is installed to base 1's rear side.

The copper strips pass through feed inlet 8 and get into in the punching press groove 10, pull out from discharge gate 9 again, can be according to the different models of lead frame, change different last mould 7 and lower mould 11, only need to insert corresponding lower mould 11 on two guide bars 12 in punching press groove 10 from cartridge mouth 32, starter motor 30 drives worm 28 and rotates, drive two worm wheel 29 and pivot rotation simultaneously, drive two double threaded rod 35 again and rotate, make two nuts 36 remove in opposite directions, when wedge 38 removes to bar mouth 39 department, under the elastic action of third spring 37, wedge 38 pops out, and then realize the tight location of clamp to lower mould 11, go up in mould 7 only need insert the slot 6 of socket 4, the picture peg inserts in the spout, realize locking through a plurality of bolts 5.

The copper strips are simultaneously abutted to the conductive strips 21 and the conductive balls 22, the copper strips with different bandwidths are in contact with the conductive strips 21 and the conductive balls 22 in corresponding numbers, the contact circuit is conducted, the first springs 27 in the corresponding length strip-shaped grooves 25 are electrified and contracted, the corresponding guide wheels 40 are pulled to move towards two sides, the conductive strips 21 and the conductive balls 22 are not in contact with the copper strips, the corresponding first springs 27 are not connected, and then the positions of the two guide wheels 40 and the copper strips are kept motionless to be matched and positioned automatically.

Start pneumatic cylinder 3 and drive socket 4 and go up mould 7 and move down, carry out the punching press to the copper strips, after the punching press becomes the lead frame, pull out through discharge gate 9, the copper waste material after the punching press falls into collecting vat 13, because there are more spaces on the lead frame, elasticity conductive head 23 can intermittent type through a plurality of spaces, when through the space, elasticity conductive head 23 does not contact with conductive seat 24, and then realize that the intermittent type of circuit switches on, make the 18 intermittent type circular telegram of second spring shrink, drive two clamp plates 15 and remove the waste material pressfitting in collecting vat 13 in opposite directions, start cylinder 31 after the pressfitting and drive push pedal 33 and remove, push away the waste material of pressfitting from release mouth 14.

In the process of intermittent electrification and contraction of the second spring 18, the piston 16 moves left and right in a reciprocating mode, the air pumping process is further achieved, the air is sucked through the air suction pipe, the air is squeezed into the air blowing pipe 20 through the air outlet pipe 19, finally the air is blown to the lead frame through the air outlet heads, powder existing after stamping is blown away, and the cleaning process is achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The lead frame die positioning device comprises a base (1) and is characterized in that a stamping groove (10) is formed in the base (1), a plug-in opening (32) communicated with the stamping groove (10) is formed in the front side of the base (1), two guide rods (12) are fixedly connected in the stamping groove (10), a lower die (11) is inserted on each guide rod (12), a clamping mechanism capable of clamping the lower die (11) is installed on each guide rod (12), a support (2) is fixedly installed on the base (1), a socket (4) capable of moving up and down is installed on each support (2), an upper die (7) matched with the lower die (11) is inserted on each socket (4), a feeding hole (8) and a discharging hole (9) communicated with the stamping groove (10) are formed in the left side and the right side of the base (1), positioning mechanisms capable of positioning copper strips of different sizes are installed in the feeding hole (8) and the discharging hole (9), the bottom of the punching groove (10) is provided with a collecting groove (13), two sides of the bottom of the collecting groove (13) are respectively provided with a pressing plate (15) capable of moving oppositely to press the copper waste, and the front side of the base (1) is provided with a material pushing mechanism capable of pushing the copper waste pressed by the pair of pressing plates (15) out of the collecting groove (13);

the positioning mechanism comprises a conductive assembly and two guide assemblies, the conductive assembly is arranged on the front side of the feed port (8), and the two guide assemblies are respectively arranged in the feed port (8) and the discharge port (9);

the conductive assembly comprises a plurality of conductive sheets (21) which are fixedly arranged at the top of the feed port (8) at equal intervals, the conductive sheets (21) are arranged along the width direction of the feed port (8), a plurality of conductive balls (22) which are in one-to-one correspondence with the conductive sheets (21) are elastically arranged at the bottom of the feed port (8), and the conductive sheets (21) and the conductive balls (22) are externally connected with a power supply;

the guide assembly comprises a plurality of pairs of strip-shaped grooves (25) with different lengths, which are arranged at the top of the feed inlet (8), the lengths of the strip-shaped grooves (25) with different lengths are sequentially increased from front to back, sliders (26) are elastically installed in the strip-shaped grooves (25) through first springs (27), the bottoms of the sliders (26) are rotatably connected with guide wheels (40), and the first springs (27) in the strip-shaped grooves (25) with sequentially reduced lengths from back to front are respectively and electrically connected with a plurality of conducting strips (21) and conducting balls (22) from inside to outside;

the elastic conductive head (23) is mounted at the top of the discharge port (9), a conductive seat (24) matched with the elastic conductive head (23) is embedded in the bottom of the discharge port (9), the elastic conductive head (23) and the conductive seat (24) are externally connected with a power supply, mounting cavities (17) are formed in two sides of the base (1), a piston (16) is arranged in each mounting cavity (17), a connecting rod is fixedly connected to the inner side of the piston (16), grooves for placing the pressing plates (15) are formed in two sides of the bottom of the collecting tank (13), the tail ends of the connecting rods extend into the grooves and are fixedly connected with the pressing plates (15), second springs (18) are sleeved on the connecting rods, and two ends of each second spring (18) are electrically connected with the elastic conductive head (23) and the conductive seat (24) respectively;

the improved discharging device is characterized in that an air blowing pipe (20) is fixed to the top of the outer side of the discharging port (9), a plurality of air outlet heads are arranged at the bottom of the air blowing pipe (20), an air suction pipe and an air outlet pipe (19) are connected to the mounting cavity (17), check valves are mounted in the air suction pipe and the air outlet pipe (19), and the air outlet pipe (19) is connected with the air blowing pipe (20).

2. The lead frame die positioning device according to claim 1, wherein the front side of the socket (4) is provided with a slot (6), two sides of the slot (6) are provided with sliding grooves, two sides of the upper die (7) are provided with inserting plates inserted into the sliding grooves, and two sides of the socket (4) are provided with a plurality of bolts (5) in threaded connection with the inserting plates.

3. The lead frame die positioning device according to claim 1, characterized in that two hydraulic cylinders (3) are mounted on the top of the bracket (2), and the telescopic ends of the two hydraulic cylinders (3) are fixedly connected with the socket (4).

4. The lead frame mold positioning device according to claim 1, wherein the pushing mechanism comprises a cylinder (31) fixedly mounted on the front side of the base (1), the telescopic end of the cylinder (31) extends into the collecting tank (13) and is fixedly connected with a push plate (33), and the rear side of the collecting tank (13) is provided with a push-out opening (14) corresponding to the push plate (33).

5. The lead frame mold positioning device according to claim 1, wherein the clamping mechanism comprises a bar-shaped cavity (34) arranged in the guide bar (12), a double-threaded rod (35) is rotationally connected in the bar-shaped cavity (34), nuts (36) are respectively in threaded connection with both sides of the double-threaded rod (35), round cavities are respectively arranged on both upper and lower sides of each nut (36), wedges (38) are elastically installed in the round cavities through third springs (37), bar-shaped openings (39) for the wedges (38) to pass through are respectively arranged on both upper and lower sides of the guide bar (12), a rotating shaft extending out of the base (1) is fixedly connected with a rear end of each double-threaded rod (35), a worm wheel (29) is fixedly connected with a tail end of the rotating shaft, a worm (28) meshed with the two worm wheels (29) is rotatably connected with the rear side of the base (1), the rear side of the base (1) is provided with a motor (30) which can drive the worm (28) to rotate.