JPH06151484A - Deburring apparatus of resin-molded part formed on lead frame - Google Patents

Abstract

PURPOSE: To easily provide a device for removing burrs of a resin-molded part which can remove the burrs of the molded part on a lead frame and at a low cost. CONSTITUTION: Two sets of left and right endless chains 25 and 26 are hung around in a blast chamber 2 in a horizontal direction. Both the side edges of a lead frame are retained with mutually parallel travelling parts of the left and right endless chains to carry the lead frame and abrasives jetted out of blast nozzles 4,... are applied to the upper and/or lower surfaces of the carried lead frame with a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for deburring a resin mold portion formed on a lead frame.

[0002]

2. Description of the Related Art Electronic parts such as so-called resin mold package type transistors, ICs and diodes are manufactured by using a manufacturing frame called a lead frame formed by punching a thin metal plate.

This lead frame is generally formed by punching a strip-shaped thin metal plate, and an island for mounting an electronic component chip and a plurality of terminal leads are formed in each region divided in the longitudinal direction. It is formed so as to extend from the pair of left and right side frame portions. The pair of side frame portions are formed with feed holes for step-feeding the lead frame in each process apparatus.

First, the lead frame F is first chip-bonded by mounting an electronic component chip on the island, and then wire-bonded by connecting a gold wire between the chip and the terminal lead. Then, a resin molding process for sealing the electronic component chip bonded as described above and the wiring portion connected between the electronic component chip and the lead terminal with a resin package is performed (see FIG. 13). A mark for printing the manufacturer name, product number, lot number, or the like is provided on the surface of the resin mold portion M thus formed, and after the inspection process and the like, each electronic component is removed from the lead frame F. The final unit electronic parts are separated.

By the way, in the above resin mold packaging process, a lower mold and an upper mold having a cavity having a shape obtained by dividing the shape of the final resin package into upper and lower parts with a lead frame sandwiched therebetween are used. The mold is clamped by sandwiching the lead frame F which has been subjected to the chip bonding and wire bonding steps by the mold, and the thermosetting mold resin is fed into each cavity.

By the way, even in such a resin molding process, as in the case of ordinary resin injection molding, extra resin enters the mating surfaces of the upper and lower molds around the mold-molded portion which is opened. Burrs that form are formed.
In resin molding, since it is necessary to spread the molten resin to every corner of each cavity space formed by clamping the upper and lower molds, the total amount of resin fed into each cavity is
It is usually set to be slightly larger than the total of the volume inside the cavity, and therefore, the burr described above is inevitably generated around the resin molded product after mold opening.

Since such burrs are unnecessary as a product and deteriorate the appearance, they must be naturally removed before shipment.

The burrs generated in the resin molding process of the electronic parts as described above are suitable for clinging to the lead terminals of the lead frame. Therefore, the burrs are effectively and adversely affect the electronic parts and the lead frame. It has been traditionally said that it is very difficult to remove it.

A typical method that has been adopted to remove burrs that occur in the resin molding process in the production of electronic components of this type is to spray a high-pressure water stream, so-called water jet, onto the resin molding portion.

In such a water jet deburring method, the apparatus itself is bulky and expensive because a high pressure of up to 1000 atm is generated, and therefore, the space of the electronic component manufacturing line is pressed and the manufacturing is performed. It is a factor that pushes up costs. Secondly, not only the main body of the water jet device but also a device for water treatment used for this, that is, a treatment device for removing unnecessary substances such as burrs from the water that is circulated and used, is required. The device is very expensive. Thirdly, in order to easily remove the burr that was formed so as to cling to the terminal lead surface of the lead frame as described above, the lead frame that had been molded in advance was immersed in a prescribed liquid to remove the burr and the lead frame surface. A pretreatment for peeling off is required, and the cost for such a pretreatment device becomes enormous.
Fourth, since the high-pressure jet is blown onto the lead frame as described above, warpage or distortion occurs in the lead frame itself, or the surface of the mold part changes to a mirror surface, which may interfere with the marking process. There are various problems that may occur.

Further, a method of removing the burrs by so-called liquid honing in which a liquid containing a predetermined abrasive is sprayed on the work may be adopted, but such a method is almost the same as the method by the water jet. I have a similar problem.

[0012]

As described above, in the field of resin-molded package type electronic component manufacturing, burrs generated after the resin-molding process are processed at a low cost and without causing an inconvenient change on the surface of the mold package. Therefore, there is a long-awaited need for a more convenient method.

The present invention has been devised under the circumstances as described above, and in manufacturing electronic parts using a lead frame, burrs generated in the resin mold packaging process can be manufactured at low cost and at low cost. It is an object of the present invention to provide a new deburring device which is simple and can be effectively removed.

[0014]

Means for Solving the Problems In the present invention for solving the above problems, the following technical means are taken.

That is, the invention described in claim 1 of the present application is an apparatus for deburring a resin mold portion on a lead frame for manufacturing electronic parts that has undergone a resin molding process, and comprises a blast chamber and the blast chamber. A lead frame carrying mechanism for carrying the lead frame horizontally or substantially horizontally in the room; and a blast nozzle for jetting a cleaning material toward the upper surface and / or the lower surface of the lead frame carried by the carrying mechanism. Including,
In addition, the lead frame transport mechanism is configured such that two sets of left and right endless chains are respectively wound around at least a pair of sprockets arranged in the front and rear of the transport direction so that portions that run parallel to each other are formed. It is characterized in that both side edges of the lead frame are supported between the mutually parallel running portions of the left and right endless chains.

Further, the invention described in claim 2 of the present application is the apparatus described in claim 1 in which the lead frame transport mechanism is slightly modified. That is, in the lead frame carrying mechanism according to the invention described in claim 2, two sets of left and right endless chains are respectively provided.
The left and right endless chains are arranged so as to form portions that run in parallel to each other by being hung between at least a pair of sprockets that are arranged so as to rotate about a vertical axis in the front-rear direction. It is characterized in that both side edges are locked on the link plate in the parallel running portion so that the lead frame is supported.

According to a third aspect of the present invention, in the deburring device according to the first or second aspect, the distance between the mutually parallel running portions of the two left and right endless chains can be adjusted by an adjusting mechanism. It is a thing.

Further, in the invention described in claim 4, in the deburring device of claim 3, the interval adjusting mechanism of the endless chain is moved left and right by a screw means on a supporting member provided with each sprocket. It is characterized by the fact that it was formed in such a way.

Further, the invention described in claim 5 is characterized in that, in the deburring device according to claim 1 or 2, the left and right endless chains are driven in synchronization with the respective sprockets on the outlet side. To be

Further, according to a sixth aspect of the present invention, in the apparatus according to the second aspect, the lead frame transport mechanism is configured as follows. That is, in the lead frame carrying mechanism according to the sixth aspect of the present invention, two sets of left and right endless chains are respectively wound around at least a pair of sprockets arranged so as to rotate around a vertical axis in the front and rear of the carrying direction. By arranging so as to form portions that run parallel to each other, both side edges are locked on the link plates of the mutually parallel running portions of the left and right endless chains to support the lead frame. On the exit side of each endless chain in the transport direction, the sprockets on which the chains are wound have the same diameter, and the driven sprockets of the same diameter are mounted on the vertical shafts on which the sprockets are mounted. Two front and rear sprockets are arranged in the area between the driven sprockets, and the drive motor is linked to either one of them. Further, the each passive sprocket, the four sprockets of the front and rear two sprockets,
It is characterized in that each driven sprocket is constructed by driving a drive chain so as to be driven to rotate in opposite directions.

Further, in the invention described in claim 7, in the deburring device according to claim 6, the sprocket on which the outlet side of each of the endless chains is wound and the shaft on which the driven sprocket is mounted are respectively left and right. Is attached to a support member whose directional position can be changed, and
The front and rear two sprockets are characterized by being attached to a stationary member.

[0022]

The resin-molded lead frame introduced into the lead frame transfer mechanism in the blast chamber is a pair of left and right endless chains that constitute the lead frame transfer mechanism and move parallel to each other toward the outlet. It is sent horizontally or substantially horizontally while being supported by both side edges. In the meantime, this lead frame is subjected to a blast process by a blast nozzle.

As a device for this blast treatment,
Low-pressure air of about 0.5 atm generated by a roots blower, etc. is sent to the blast nozzle at a high flow rate and high speed,
In the blast nozzle, a so-called low-pressure blasting device (see Japanese Patent Laid-Open No. 62-236674) configured to mix a predetermined polishing and cleaning material with the above-mentioned high flow rate high-velocity air and inject this from the tip of the nozzle. ) Has already been put to practical use by the inventor of the present application, and such a low-pressure blasting device is suitable as the blasting device used in the device of the present invention.

In the lead frame transport mechanism, two sets of left and right endless chains are arranged while forming portions that run parallel to each other, and both side edges of the lead frame are supported by the portions that run parallel to each other. I am trying to do it.
That is, the left and right two sets of endless chains have both the function of supporting the lead frame at both side edges thereof and the function of transporting the thus-supported lead frame from the inlet side to the outlet side. Then, since each lead frame is conveyed while being locked by the pair of left and right chains, both the upper and lower surfaces of the resin mold portion normally formed at the center portion in the width direction of the lead frame. , And can be effectively conveyed with the upper and lower parts exposed. Then, the resin mold portion of the lead frame can be effectively subjected to the blast treatment by the blast nozzles arranged above and / or below the lead frame transport path. Since the lead frame itself has voids formed between the lead terminals in the first place, the polishing agent carried by the high-speed air stream ejected from the blast nozzle can be effectively molded with the resin mold on the lead frame. It is possible to collide with the department.

It has been confirmed by the inventor of the present application that even burrs formed so as to stick to the lead frame when subjected to the blast treatment in this manner can be removed very efficiently.

As described above, in the present invention, since the deburring action is performed by the blasting treatment, the device is dramatically downsized and the cost is reduced as compared with the case of the conventional water jet. Will be realized. Further, as in the case of using a water jet, water treatment and pretreatment for raising burrs clinging to the lead frame are completely unnecessary, which significantly reduces the equipment cost.

Further, although the surface of the resin mold package may be scraped off by the collision of the polishing agent,
In the first place, since the blast treatment is non-directional grinding, the surface of the resin mold package is only so-called satin-like, which does not deteriorate the product quality, but rather forms a suitable base for the mark. It Further, the lead frame itself is not damaged as in the case of using the water jet.

In addition to the basic operational effects as described above, the following operational effects can be expected from the inventions described in claims 2 and below of the present application.

That is, as described in claim 2, two sets of left and right endless chains are hung between sprockets arranged so as to rotate around respective vertical axes, and between the sprockets. A part of the link plate of the chained endless chain constitutes a locking means for supporting both side edges of the lead frame. Therefore, the lead frame transport mechanism can be achieved by the chain itself, without the need to add any other locking means, at a lower cost, and can conveniently transport the lead frame while supporting both side edges thereof.

When the distance between the portions of the two sets of left and right endless chains that run parallel to each other can be adjusted as in claim 3, it is easy to change the type of electronic components to be manufactured and the width of the lead frame. The versatility of the deburring device of the present invention is further enhanced.

And, as described in claim 4,
A mechanism for adjusting the width of the above left and right endless chains,
If the supporting member provided with each sprocket is configured to be movable in the left-right direction by the screw means, the position of the supporting member or the lateral direction with respect to the conveying direction of the chain can be easily finely adjusted by the rotation of the screw. You can

Further, as described in claim 5,
If the left and right endless chains are driven synchronously with the sprocket on the outlet side in the transport direction of at least the pair of front and rear sprockets around which they are wound, the lead frames are supported on the parallel parts that run to the outlet side. Since various tensions are applied, proper lead frame transportation is realized without slack in the chain.

The invention described in claim 6 is such that two sets of left and right endless chains are conveniently and synchronously driven by a single drive motor.

That is, in the two sets of left and right endless chains, the sprockets around which the chains are wound have the same diameter on the outlet side in the conveying direction, and the driven shafts to which the sprockets are attached are driven sprockets of the same diameter. On the other hand, since one drive chain is wound around these driven sprockets via two front and rear sprockets, one of the front and rear two sprockets is driven by a single drive motor. By
The left and right endless chains will be driven synchronously.

Further, as described in claim 7,
If each shaft on which the sprocket around which the exit side of each endless chain in the transport direction is wound and the driven sprocket are mounted on the same shaft, is mounted on a support member that can change its position in the left-right direction It becomes possible to conveniently adjust the distance between the left and right endless chains, while maintaining the advantage that the drive chains of FIG.

As described above, according to the present invention, the deburring of the resin mold portion on the lead frame, which has been difficult in the past and required a considerable capital investment for realization, can be achieved extremely simply and at low cost. In addition, it is possible to obtain an extremely excellent effect that the resin mold package after deburring is not adversely affected as a product.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to the drawings.

1 and 2, the deburring apparatus 1 of the present invention is basically transported in the blast chamber 2 by a frame transport mechanism 3 in a horizontal direction or a substantially horizontal direction. The lead frame
It is configured to deburr by blasting. The blast treatment is carried out by blasting the polishing / cleaning material on high-speed air from the blast nozzles 4 arranged in the blasting chamber 2, and the polishing / cleaning material is repeatedly used repeatedly. There is.

There are various types of blasting devices for performing such a blasting process. First, an example of the blasting device shown in the drawings will be described, and then the concrete structure of the frame transfer mechanism 3 will be described. I will explain an example.

Inside the blast chamber 2, a plurality of blast nozzles 4 are arranged vertically so as to face the lead frame F which is horizontally transported by the frame transport mechanism 3 as described above. An air supply pipe 5 to which the air sent from a low pressure air generation source (not shown) such as a roots blower is supplied is arranged above the blast chamber 2, and the air supply pipe branched from this air supply pipe 5 is provided. The hoses 5a ... Are connected to the base end portions of the blast nozzles 4 ... Each blast nozzle 4 ...
Further, the abrasive cleaning material supply hoses 6 ... Are connected to the base end portion of the. The blast nozzle 4 ... is the air supply hose 5a.
The suction / cleaning material supply hose 6 is made to be sucked by the air flow sent from the inside of the blast nozzle at a high speed.
It is possible to use a publicly known one configured so that the polishing agent sent from.

An umbrella-shaped dust collecting hood 7 is arranged above the blast chamber 2, and the upper part of the dust collecting hood 7 is connected to the outside of the blast chamber 2 via a dust collecting pipe 8. It is connected to the dust collector 9 (FIG. 2) arranged adjacently. This dust collecting device 9 generates suction force by a suction blower 11 installed in the upper part of the dust collecting chamber 10, and the dust-containing air introduced from the dust collecting pipe 8 into the dust collecting chamber 10 by this suction force. A publicly known one configured to remove dust by a filter can be used.

On the other hand, the lower portion of the blast chamber 2 is reduced in diameter in a hopper shape, and a polishing / cleaning material recovery container 13 is connected below the hopper portion 12. In the blasting apparatus of the present embodiment, the polishing / cleaning material S stored in the polishing / cleaning material recovery container 13 connected to the lower portion of the blast chamber 2 is transferred through the polishing / cleaning material supply hose 6 ... The polishing and cleaning material S is sent to each of the blast nozzles 4 so that it can be circulated.

That is, as clearly shown in FIGS. 3 and 4, one side wall 13a of the polishing / cleaning material recovery container 13 is made to penetrate and support the polishing / cleaning material suction pipe 14, while the other side wall of the recovery container 13 is supported. 13b includes the suction pipes 14 ...
The air supply pipes 15 ... Are supported in a penetrating manner so as to have the same axis as the above, and the outer ends of the suction pipes 14 ... While being connected to the base end of the ...
The base end side of ... Is connected to the blower means 16.

In the present embodiment, the suction pipes 14 ...
Is a boss portion 17 formed through one side wall of the collection container 13.
The slide position can be adjusted in the horizontal direction with respect to ... And the adjusted position is retained by the set screw 18 screwed from the side wall of the boss portion 17.

Further, each of the air supply pipes 15 ... Is also supported by being inserted through the inside of the boss portion 19 supported on the other side wall of the recovery container 13 so that the slide position can be adjusted in the horizontal direction. Each air supply pipe 1 by the set screw 20 screwed to the
The position after adjustment of 5 ... in the axial direction is retained.

Further, as well shown in FIG. 4, the diameters of the air supply pipes 15 ... Are made smaller than the inner diameters of the suction pipes 14 ... And the inner end portions of the suction pipes 14 ... The inner diameter of the taper taper increases inward.

By doing the above, by adjusting the axial position of one or both of the suction pipes 14 ... And the air supply pipes 15 ...
The size and axial length of the annular clearance 21 between the inner end openings 4 and the tip of the air supply pipe 15 can be adjusted appropriately.

As described above, the base end side of each air supply pipe 15 ... Is connected to the air blowing means 16, but in this embodiment, as shown in FIG. 1, each air supply pipe 15 ...
The outer end of the surge tank 23 is connected to the surge tank 23 via the hoses 22 and the surge tank 23 is connected to the blower 24. Therefore, the blower 24 is attached to each air pipe 15.
Is sent through the surge tank 23 or the hoses 22 ...

When the blasting device is in the operating state, the dust collecting device 9 is in the operating state, the suction force is applied to the dust collecting hood 7 above the blast chamber 2, and the roots blower (not shown) is used. Air from an air generation source such as the above is sent to each blast nozzle 4 through an air supply pipe 5. Then, as described above, the abrasive cleaning material recovery container 13
In, the air from the blower 24 is sent to each of the air supply pipes 15 ... toward the inner end opening of each of the suction pipes 14.

In the recovery container 13, when air is sent into each of the suction pipes 14 ...
The collection container 13 is attracted to this air flow.
The cleaning material S accumulated in the lower part of the suction pipe 14 is drawn into the suction pipes 14 through the annular clearance between the suction pipes 14 and the air supply pipes 15. In this way the suction pipe 14 ...
The polishing and cleaning material drawn into the inside is given a dynamic pressure by the air flow from the air supply pipes 15 ... And a negative pressure generated by high-speed air flowing through each blast nozzle 4 ... through the air supply pipe 5. Is sent to each blast nozzle 4 via the abrasive cleaning material supply hose 6, and is mixed with the high-speed air flow in the blast nozzle and injected again. In other words, the suction pipe 14
The polishing and cleaning material drawn into the inside of the blasting nozzle 4 has a positionally high blasting nozzle 4 due to the synergistic effect of the pumping force due to the air flow from the air supply pipe 15 and the negative pressure generated in the blasting nozzle 4. It is conveniently transported via the cleaning material supply hose 6.

Moreover, by adjusting the size and the axial length of the annular clearance 21 formed by the suction pipes 14 and the air supply pipes 15 ... According to the particle size or specific gravity of the polishing and cleaning material used. , The suction pipe 14, and the abrasive cleaning agent supply hose 6, and the amount of the abrasive cleaning agent sent to the blast nozzles 4 for circulation can be appropriately adjusted.

Now, the present invention is particularly configured to efficiently remove burrs that cling to the manufacturing frame F after the resin molding step so as to cling to the manufacturing frame F. As shown in FIG. 13, the manufacturing frame F is generally in the form of a strip formed by punching out a thin metal plate, and its width direction middle part is
The resin mold portions M are formed at equal intervals so as to be supported by the leads.

The deburring apparatus 1 of the present invention conveniently conveys the manufacturing frame F having the above-described general form in the blast chamber 2 in the horizontal direction or in the substantially horizontal direction, and above the conveyance path or / And a deburring process using a polishing and cleaning material sprayed from a plurality of blast nozzles 4 arranged below.

The transfer mechanism 3 basically comprises two sets of endless chains 25 and 26 arranged on the left and right with respect to the transfer direction. Each of the endless chains 25, 26 is wound between sprockets 29a, 29b rotatably attached to an inlet portion 27 and an outlet portion 28 formed on opposite side walls of the blast chamber 2 about a horizontal axis. . In the endless chains 25 and 26, the portions 25a and 26a that run away from the sprocket 29a on the inlet side and run toward the sprocket 29b on the outlet side run parallel to each other at a constant speed. And each endless chain 2
5 and 26 are designed to be driven by rotationally driving the sprocket 29b on the outlet side, and the space between the two sprockets 29a, 29a on the inlet side.
By adjusting the distance between the two sprockets 29b, 29b on the outlet side, the distance between the chain portions 25a, 25b traveling in parallel as described above can be changed.

Hereinafter, the structure around which the endless chains 25 and 26 are wound will be described separately for the inlet side 27 and the outlet side 28.

5 to 7 show left and right endless chains 2.
5 shows a support structure on the inlet side of the valves 5, 26. Support shaft 3 with the above-mentioned sprockets 29a, 29a attached to the upper end
0 and 30 are vertically supported by support members 31 and 31 that can slide in the left-right direction with respect to the transport direction. As shown in FIG. 6, the support members 31 and 31 engage with the guide members 32 and 32 arranged in the front and rear of the inlet container 27a so that the support members 31 and 31 can be slidably moved in the left and right directions. ing. The support members 31 and 31 have through holes 33 and 3 in the left-right direction.
3 is provided.

On the other hand, a male screw portion 35a formed on the rotary shaft 35 is screwed into the female screw member 34 (FIG. 7) attached to the side wall of the inlet container 27a. The inner small diameter portion 35b of the rotary shaft 35 is inserted through the left-right through hole 33 of the support member 31, and the large diameter portion 35c is formed at the inner end of the rotary shaft 35. There is.
Further, the tool engaging means 3 is provided on the outer end of the rotary shaft 35.
5d is formed.

Therefore, when the rotating shaft 35 is rotated by applying an appropriate tool to the outer end tool engaging means 35d, the screw feeding action is caused by the rotation of the male screw portion 35a of the rotating shaft 35 with respect to the female screw member 34. The rotary shaft 35 reciprocates in the axial direction. Then, the support member 3 into which the small diameter portion 35b of the rotary shaft 35 is inserted.
1, 31 are moved in the left-right direction along with the axial movement of the rotary shaft 35.

The respective inlet side sprockets 29a, 29a corresponding to the left and right endless chains 25, 26 are supported by the independent supporting members 31, 31 as described above, and are arranged in the left-right direction by the rotary shaft 35. The position adjusting mechanism is also provided for each of the left and right. Therefore, the spacing between the sprockets 29a, 29a supporting the inlets of the left and right endless chains 25, 26 can be adjusted by moving the support members 31, 31 in the left-right direction as described above.

Incidentally, reference numeral 36 in FIGS.
Shown by is a loading guide for introducing the lead frame F between the left and right endless chains 25, 26.

8 to 11 show left and right endless chains 2.
5 shows the support structure on the outlet side 28 of 5, 26. A vertical support shaft 37 having sprocket 29b, 29b around which the outlets of the respective endless chains 25, 26 are wound around,
37 is rotatably attached to support members 38, 38 that are supported in the outlet container 28a so that their positions can be adjusted in the left-right direction.

The above-mentioned support members 38, 38 are each independently position-adjustable in the left-right direction, and the mechanism for enabling such position adjustment is the same as the adjustment mechanism for each sprocket on the inlet side. Is.

That is, the support members 38, 38 are provided with a through hole 39 penetrating in the left-right direction, and the through shaft 39 is supported by a rotary shaft penetratingly supported by the side wall of the outlet container 28a so as to be able to advance and retract. An inner small-diameter portion 40b of 40 is inserted, and a retaining large-diameter portion 40c is formed at the inner end of the small-diameter portion 40b. Therefore, this rotating shaft 40
Is rotated to move the screw back and forth with respect to the side wall of the outlet container 28a in the left-right direction, so that the space between the support members 38, 38 and the sprockets 29b, 29b supported by the vertical shafts 37, 37. Can be adjusted appropriately.

In this embodiment, the endless chains 25 and 26 are driven by rotating and driving the sprockets 29b and 29b around which the inlets are wound. Further, both sprockets 29b, 29b need to be synchronously rotated in the opposite directions at a constant speed, and in the present embodiment, this is configured as follows.

As shown in FIGS. 9 and 10, a sprocket 29 around which the above-mentioned endless chains 25, 26 are wound.
The driven sprockets 41, 41 are attached to the lower ends of the support shafts 37, 37 having the upper ends b, 29b, respectively. Of course, the diameters of the driven sprockets 41, 41 to be attached to the both support shafts are the same as each other.

On the other hand, the front and rear two sprockets 43 and 44 are rotatably attached to and supported by the stationary member 42 in the outlet container 28a, and one of the sprockets 44 (right side in FIG. 9) is rotated by the motor 45. I'm trying to drive. As described above, the two sprockets 43, 44 to be arranged in the front-rear direction are arranged at the same height position as the driven sprockets 41, 41.
And these four sprockets 41, 41, 43, 44
A driving endless chain 46 is wound around the.

However, since the driven sprockets 41, 41 need to rotate in opposite directions by the traveling of the driving endless chain 46, the driving endless chain 46 is wound around as shown in FIG. It By doing so, when the sprocket 44 attached to the support shaft of the motor 45 is rotationally driven in the direction of the arrow in FIG.
The driving endless chain 46 runs in the direction of the arrow in FIG. 11, whereby the left and right driven sprockets 41, 41 are rotationally driven in opposite directions. As a result, the left and right endless chains 25, 26 that run parallel to each other 25a, 2
6a will be run synchronously by being pulled at a constant speed from the inlet side to the outlet side.

As long as the distance between the left and right sprockets 29a, 29b is symmetrically adjusted by the adjusting mechanism, the four endless driving chains 46 are properly slackened without slack. Four
The state of being laid around 1, 43, 44 will be maintained.

Since the left and right endless chains 25 and 26 are respectively wound around the sprockets supported by the vertical shafts, as shown in FIG. 12, the link plates of the endless chains 25 and 26 are well represented. 47a, 47a form engaging means for engaging and supporting both side edges of the lead frame F. In a state where the left and right endless chains 25, 26 are running, the lead frame F fed from the inlet-side loading guide 36 has its both side edges conveniently connected to the link plates 47a, 47 of the left and right endless chains 25, 26.
In the state of being locked to a, it will be conveyed forward.

In this embodiment, the upper end link plates 47b, 4 are attached to the respective endless chains 25, 26.
A regulating piece 49 for preventing the lead frame F conveyed by being mounted on the lower link plates 47a, 47a from being inadvertently lifted up against the L-shaped standing piece 48 integrally extended to 7b is suitable. Installed at intervals.

Further, in this embodiment, in order to prevent the parallel running portions of the left and right endless chains 25, 26 from hanging down, the guides 50, 50 are engaged between the upper and lower link plates on the outer side in the left-right direction. It has been arranged. Both ends of the guides 50, 50 are supported by the brackets 51 while adjusting their heights with respect to the support members 31, 31 on the inlet side and the support members 38, 38 on the outlet side, respectively. Therefore, when the positions of the support members 31, 31 and 38, 38 are adjusted in the left-right direction as described above, the parallel running portions 25a, 25a of the endless chains 25, 26 are moved in the left-right direction together with the guides 50, 50. Will be moved to.

In addition, in order to prevent the guide frame 50, 50 from being lifted or pushed down, the lead frame F, which is conveyed while being supported by engaging both side edges between the chains 25, 26, at an appropriate portion in the conveying direction. Backup guides 52 and 53 for backup are fixedly attached. As will be described later, this is a lead frame F that is supported and runs between the chains 25 and 26 as described above.
Is subjected to a blast treatment by the blast nozzles 4 from above or below, but since the high-speed air flow mixed with the polishing and cleaning material in this blast treatment is extremely high in speed, elastic deformation of the frame F from the opposite side is caused. This is because a backup may be required to prevent this.

In the above construction, the inlet side feeding guide 3
The lead frame F, which has been subjected to the resin molding process and is put in from 6, is mounted on the left and right endless chains 2 which run parallel to each other.
Both side edges are engaged and supported by the lower link plates 47a, 47a of the rollers 5, 26, and are conveyed horizontally toward the exit as the chain travels. As described above, this lead frame F has the left and right endless chains 2 only at its both side edges.
5 and 26 are engaged and supported, and the upper and lower surfaces of the middle portion in the left-right direction are exposed, so that the blast nozzle 4 arranged above and the blast nozzle 4 arranged below can be placed on high-speed air. It is possible to undergo a blasting treatment with the injected cleaning agent, and at this time, the burrs formed on the resin mold portion M of the lead frame are efficiently removed by the blasting action.

That is, the frame transfer mechanism 3 of the present invention is constructed so as to support both side edges of the lead frame F and transfer the same, and further, the lead frame F
As such, since the gap between the lead terminals allows high-speed air to permeate, the abrasive material sprayed from the blast nozzles 4 as described above is not unnecessarily decelerated, and the effect is obtained. Even the burr formed so as to hit the upper and lower surfaces of the lead frame F and cling to the lead frame can be removed without any problem. It should be noted that as the above-mentioned cleaning agent, a suitable one is selected from plant-based materials obtained by crushing the shells of walnuts and apricots, or those made of resin such as vinyl.

The lead frame F, which has been deburred by the blasting operation in this way, is sent to the outlet while being supported by the endless chains 25 and 26 as it is, and is provided at the end of the outlet container 28a. Discharge chute 5
Emitted from 4.

As described above, the deburring device for the resin mold portion formed on the lead frame according to the present invention is
No need for complicated and expensive equipment such as water jet, and no additional equipment such as water treatment or pretreatment equipment to raise burrs clinging to the lead frame, and no drying process. Further, the resin mold portion M can be deburred. Since the blasting process itself is non-directional grinding, the surface quality of the resin mold portion is not deteriorated, and rather, an additional effect that a base can be formed as a pre-process of the marking process can be performed. is there.

The frame transfer mechanism 3 of the present invention transfers the lead frame F horizontally so that both side edges are engaged and supported by the endless chains 25 and 26 arranged on the left and right. That is, the left and right endless chains 25, 26 have both the function of supporting the lead frame and the function of carrying in the feed direction, and therefore, the carrying mechanism is simple and therefore There is less concern about failure.

Of course, the scope of the present invention is not limited to the above embodiments. In the embodiment, the left and right endless chains are hung between the sprockets attached to the vertical shaft, but it is of course within the scope of the present invention to hang between the sprockets supported by the horizontal shaft. included. In this case, the link plate of the endless chain itself cannot be used as the locking means, but the locking means for locking both side edges of the lead frame F may be configured by deforming the link plate. Good.

Although the blast nozzles are arranged both above and below the lead frame in the embodiment, the blast nozzles are provided above or below the lead frame depending on the type of the lead frame to be deburred. It can also be arranged. Further, in this case, a plurality of blast nozzles are arranged in advance in both the upper portion and the lower portion of the lead frame, and the operation of the upper or lower blast nozzles is performed, for example, in the middle portion of the air supply hose for each blast nozzle. It is also possible to select ON / OFF by providing a control valve.

The basic structure of the blasting device itself is not limited to the above embodiment. That is, in the example, the polishing and cleaning material accumulated in the lower portion of the blast chamber is directly guided to the blast nozzle, but a cyclone separator or a separation chamber is installed above the blast chamber,
Once the abrasive is pulled up to the cyclone separator or separation chamber, the dust contained in it is separated, and the abrasive collected in the lower part of the cyclone separator or the separation chamber is passed through the abrasive supply hose. It is, of course, within the scope of the present invention to introduce the blast nozzle into each blast nozzle.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall schematic configuration of an embodiment of a deburring device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

5 is a schematic plan view showing the configuration of the inlet portion of the frame transfer mechanism of the deburring device of FIG. 1. FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a schematic plan view showing the configuration at the outlet of the frame transport mechanism of the deburring device of FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX of FIG.

11 is a view taken along the line XI-XI of FIG.

FIG. 12 is an enlarged sectional view taken along line XII-XII in FIG.

FIG. 13 is a plan view of an example of a lead frame.

[Explanation of symbols]

 1 Deburring device 2 Blast chamber 3 Frame transfer mechanism 4 Blast nozzle 25 Endless chain 26 Endless chain

Claims (7)

[Claims] 1. An apparatus for deburring a resin mold portion on a lead frame for manufacturing an electronic component that has undergone a resin molding process, comprising: a blast chamber, and the lead frame being horizontally or substantially horizontal in the blast chamber. And a blast nozzle for injecting a polishing / cleaning material toward the upper surface and / or the lower surface of the lead frame transported by the transport mechanism, and the lead frame transport mechanism By arranging two sets of left and right endless chains between at least a pair of sprockets arranged in the front and rear of the carrying direction, respectively, so as to form portions that run in parallel with each other. Both side edges of the lead frame are supported between mutually parallel running portions of the endless chain. Wherein, deburring machine of the resin mold portion formed on a lead frame. 2. An apparatus for deburring a resin mold portion on a lead frame for manufacturing electronic parts that has undergone a resin molding process, comprising: a blast chamber, and the lead frame being horizontally or substantially horizontal in the blast chamber. And a blast nozzle for injecting a polishing / cleaning material toward the upper surface and / or the lower surface of the lead frame transported by the transport mechanism, and the lead frame transport mechanism The two left and right pairs of endless chains are respectively wound around at least a pair of sprockets arranged so as to rotate around a vertical axis in the front-rear direction, thereby forming portions that run parallel to each other. The left and right endless chains are locked on both side edges on the link plates of the mutually parallel running parts. Above, wherein the lead frame is configured to be supported, deburring machine of the resin mold portion formed on a lead frame. 3. The deburring device according to claim 1, wherein the interval between the parallel running portions of the left and right two sets of endless chains can be adjusted by an adjusting mechanism. 4. The deburring device according to claim 3, wherein the adjusting mechanism is configured so that a supporting member provided with each sprocket can be moved in the left-right direction by a screw means. 5. The deburring device according to claim 1, wherein the left and right endless chains are run by synchronously moving the respective sprockets on the exit side. 6. An apparatus for deburring a resin mold portion on a lead frame for manufacturing electronic parts that has undergone a resin molding process, comprising: a blast chamber, and the lead frame being horizontally or substantially horizontal in the blast chamber. And a blast nozzle for injecting a polishing / cleaning material toward the upper surface and / or the lower surface of the lead frame transported by the transport mechanism, and the lead frame transport mechanism. The two left and right pairs of endless chains are respectively wound around at least a pair of sprockets arranged so as to rotate around a vertical axis in the front-rear direction, thereby forming portions that run parallel to each other. The left and right endless chains are locked on both side edges on the link plates of the mutually parallel running parts. Being configured the lead frame is supported in each transport direction outlet side of each endless chain, the sprocket each chain is reeved with the same diameter,
A driven sprocket of the same diameter is attached to each of the vertical shafts to which these sprockets are attached, two front and rear sprockets are arranged in a region between these driven sprockets, and a drive motor is linked to either one of them. The lead sprocket and the four sprockets of the front and rear two sprockets, each driven sprocket is configured to be driven around the drive chain so that the driven sprockets rotate in opposite directions. A deburring device for the resin molded part formed on the frame. 7. A sprocket around which the exit side of each of the endless chains is wound around and a shaft to which the driven sprocket is attached are attached to a support member whose position in the left-right direction can be changed, and the front-rear direction. The deburring device according to claim 6, wherein the two sprockets are attached to a stationary member.