JP3144696B2 - Lead frame processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame processing machine.

[0002]

2. Description of the Related Art In a processing machine for forming a lead frame or the like, a plurality of processing dies are arranged in a series in order to perform continuous processing in several steps, and the lead frame is sequentially fed between the dies. Processing is applied. FIG. 3 shows a configuration of a conventional lead frame processing machine. In the figure, reference numeral 10 denotes a first processing die, and 12 denotes a second processing die. 14 is a feed rail of a lead frame, 16 is a feed plate of a first processing die, 18 is a feed plate of a second processing die, and 20 is a rail between dies connecting the first die and the second die. is there. The lead frame is transported while being supported by the feed plates 16 and 18 and the inter-mold rail 20.

Reference numeral 22 denotes a feed arm for feeding a lead frame at a pitch. The feed arm 22 is disposed above the feed plate and is driven to reciprocate left and right by a feed pitch. A feed pin inserted into a guide hole of the lead frame when feeding the lead frame at a pitch is provided upright on the lower surface of the feed arm 22. The feed plates 16, 18 and the inter-die rail 20 are supported so as to be able to move up and down, and are retracted to the lower position when the upper die is lowered in order to process the lead frame. Lift the leadframe from the surface. The lead frame lifted by the feed plate is fed by the feed pin inserted into the guide hole and engaged with the feed arm 22, and the feed arm 22 is moved laterally by pitch.

[0004]

As described above, in a conventional processing machine, a lead frame is sequentially fed by a feed arm to perform processing. In an actual processing machine, the feed arm is connected to one drive source so that all the feed arms reciprocate simultaneously. Since lead frames are successively mounted on the feed plates 16, 18 and the inter-die rail 20, these lead frames are therefore simultaneously transferred by one pitch. As described above, since the lead frame is sequentially conveyed and processed at the same pitch from the preceding processing die to the next processing die, it is necessary to accurately position and transfer the lead frame when transporting the lead frame. . In the processing mold, a mold pilot pin 24 is provided.
Fits into the guide hole to position the lead frame. When the lead frame is transported as described above, if the feeding is not performed accurately, burring occurs in the guide hole, and when the lead frame is positioned with the mold, it cannot be accurately positioned, which causes a processing defect. . In the conventional apparatus, as shown in FIG. 3, a brake roller 26 is provided to clamp the lead frame between the lead frame and the inter-die rail so that the lead frame is not displaced when the lead frame is on the inter-die rail 20.

[0005] By the way, if there is an error in the feed mechanism of the processing machine, a problem such as burring of the guide hole occurs.
The error of the feed mechanism is caused by a setting error at the time of exchanging a die for processing a different kind of product, a production tolerance of the die itself, or an aging of the die. If an error occurs when the mold is replaced and set, the feed pin position of the feed arm deviates from the normal position, and burring occurs in the guide hole portion. For this reason, it is essential to adjust the feed arm etc. to correct the positional deviation when the mold is replaced, and adjustment work is required each time when processing a variety of products. Therefore, there is a problem that the operation is complicated.

[0006] Further, as a structural problem of the processing machine, there is a problem that the press position is previously set to a fixed position in the processing machine. In other words, in the processing machine, the processing mold is exchanged and used according to the product.
The position of the pressing portion (cylinder) of the press and the position of the load center of each processing die do not always match exactly. This is because the feed pitch of the lead frame varies from product to product, and when a lead frame of a different pitch is applied, the pressing portion of the press does not always come to a position that is exactly an integral multiple of the feed pitch of the lead frame. For example, even if the center of load of the processing die and the press position are made to coincide with each other in the first processing die, a displacement occurs in the second processing die. As described above, when the position of the load center of the mold and the position of the pressing portion of the press deviate from each other, the mold is tilted and pushed, which causes problems such as improper processing and uneven wear of the post. . The present invention has been made to solve the above problems, and the purpose thereof is to:
Even when processing lead frame products with different feed pitches, or when errors occur when setting dies, it is possible to accurately position and process products with each processing die, It is an object of the present invention to provide a lead frame processing machine capable of performing accurate processing by aligning a pressing position with a load center of a processing die even for different products.

[0007]

The present invention has the following arrangement to achieve the above object. That is, a plurality of processing dies are arranged in series, a rail between dies is provided between the respective processing dies to guide the lead frame and transfer to the next processing die, and the lead frame is pitch-fed by the feed arm for processing. In the lead frame processing machine to be provided, a feed drive unit for transferring the lead frame to the next processing die is provided at the rail between the dies, and the lead frame transferred by the feed drive unit is related to the next processing die. A stopper mechanism for stopping and positioning the lead frame at a regular position with respect to the processing die is provided.

[0008]

The lead frame is processed by the processing die while being pitch-fed by the feed arm. When the lead frame is unloaded from the unloading side of the processing die to the rail position between the dies, the lead frame is moved to the next processing die position by the feed drive unit. The lead frame that has moved on the rail between the dies is locked by the stopper mechanism of the next processing die, and the feed position is regulated. Since the stopper mechanism is set to position the lead frame at the correct position for the next processing die,
The lead frame having moved the rail between dies can be accurately positioned and processed with respect to the next processing die.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view showing one embodiment of a lead frame processing machine according to the present invention. Figure 1
2 shows a planar arrangement of a processing die 30, a second processing die 32, a feed plate, and the like. In the drawings, the same members as those of the conventional example are denoted by the same reference numerals. Feed plates 34 and 36 that support the lead frame and slide and guide in the feed direction are installed on the first processing die 30 and the second processing die 32, respectively. These feed plates 34 and 36 are set according to the processing die. Reference numeral 31 denotes a mold stopper for positioning and setting a working mold. A feed rail 14 for supplying a lead frame is provided on the introduction side of the first processing die 30.
The inter-mold rail 20 is provided between the processing die and the second processing die.

The rail 20 between the molds includes a feed plate 34.
This is for transferring the lead frame sent out from the feed plate 36 to the next feed plate 36, and guides and transports the lead frame by setting rail intervals according to the width size of the lead frame. The rail 20 between the dies moves up and down in accordance with the pressing operation of the dies of the first processing die and the second processing die similarly to the feed plates 34 and 36 as in the conventional example. In the conventional example, when the lead frame is transferred between the dies, the lead frame is sent from one side to the other, so that the length of the rail between the dies is in a positional relationship in which either one of the feed arms can always lock the lead frame. Is set as follows. However, in the case of the present embodiment, the length of the rail between molds is set long so that the lead frame is free from the feed arms of both the first processing die and the second processing die on the rail between molds. Keep it.

Reference numeral 38 denotes a feed roller provided below the inter-die rail 20. The feed roller 38 is for feeding the lead frame sent out onto the inter-die rail 20 in advance, and the lower surface of the lead frame comes into contact with the outer surface of the feed roller 38 when the inter-die rail 20 descends to the lower position. Place at the height position. In the embodiment, two of them are juxtaposed within the width of the rail 20 between molds. The feed roller 38 is connected to a drive unit such as a motor and driven to rotate. 40 is a confirmation sensor, 42
Is a stopper with which the front end of the lead frame comes into contact. The stopper 42 is a stopper for positioning the lead frame at a regular position with respect to the second processing die 32, and is set in advance on the second processing die 32 itself.

The feed arm 22 for feeding the lead frame at pitches on the feed plates 34 and 36 extends from the side of the processing die onto the feed plates 34 and 36 and is locked to the driving rod 44 at the base position. . The drive rod 44 is connected to a drive cylinder 46 and reciprocates in the feed direction of the lead frame on the feed plates 34 and 36. A feed pin 48 inserted into a guide hole of a lead frame is provided on the lower surface on the front end side of the feed arm 22.
Is established.

Next, the operation of the lead frame feeding mechanism of the above embodiment will be described. First, the lead frame fed from the feed rail 14 to the leading end of the first processing die 30 is pitch-fed into the first processing die 30 by the feed arm 22 and is sequentially processed. First processing die 3
With the processing at 0, the lead frame is gradually carried out to the inter-die rail 20 side. The feed arm 22 located on the unloading end side of the first processing die 30 also has a drive rod 44.
The lead frame conveyed to the carry-out end side is sent out to the inter-die rail 20 by this feed arm. The lead frames are sequentially supplied to the first processing die 30, and when the processing of the previous lead frame is completed, the process proceeds to the processing of the next lead frame.

The lead frame that has been processed by the first processing die 20 is carried out onto the rail 20 between the dies by the feed arm 22, and when the lead frame is completely carried out from the first processing die 20, the lead frame is fed. The roller 38 is driven to rotate, and the lead frame slides and is advanced on the inter-die rail 20, and stops when the front end of the lead frame contacts the stopper 42. The confirmation sensor 40 is a sensor for confirming that the lead frame has been carried out onto the rail 20 between the molds. The feed roller 38 is operated when it is detected that it has been completely unloaded from one processing die 30.

FIG. 2 shows the operation of feeding the lead frame by the feed roller 38. As described above, the rail 20 between the molds is used.
Moves up and down according to the up and down movement of the die in the working die, and is free from engagement of the feed pin 48 in a state where the inter-die rail 20 is at the lower position. Then, the inter-mold rail 20 is lowered to the lower position, and the lead frame is also lowered, so that the lower surface of the lead frame comes into contact with the outer surface of the feed roller 38 and the lead frame is advanced. In this embodiment, the length of the inter-mold rail 20 is set to be long so that the lead frame is
The lead frame slides freely on the inter-die rail 20 so that the lead frame is free.

The stopper 42 is located at a position where the lead frame is in contact with the stopper 42.
Is set in advance so as to match the position of the guide hole of the lead frame. Therefore, the lead frame fed forward by the feed roller 38 to the position where the lead frame comes into contact with the stopper 42 is surely inserted into the guide hole by the feed pin 48 and fed by the pitch. Thus, it is possible to accurately position the lead frame with respect to the second processing die 32 and feed the lead frame at the pitch.

As described above, in the lead frame processing machine of the present embodiment, when the lead frame is transferred between the processing dies, the lead frame is advanced by the feed roller in the rail between the molds without using the feed arm. Thus, the lead frame can be positioned according to the reference position of the second processing die. Therefore, when designing the second processing die, the center of load of the die can be set in accordance with the pressing portion of the press without being affected by the feed pitch of the lead frame. In addition, if the stopper 42 is set at the reference position for the second processing die, the lead frame is always positioned at the normal position with respect to the second processing die, and when the processing die is set on the processing machine, the lead frame is slightly moved. Even if an error occurs, a regular positional relationship can always be maintained in the positional relationship between the processing die and the lead frame.

As described above, by using the lead frame processing machine according to the present invention, the center of load of the processing die and the pressing portion of the press are made to coincide with each other even when a lead frame product of any pitch feed is applied to the processing machine. Can be set,
Suitable processing can be performed. In addition, when the processing die is replaced and set on the processing machine, even if a setting error occurs, the error can be corrected at the rail between the dies and introduced into the next processing die. It will be easier. The correction effect at the rail between the molds is similarly corrected in the case of another error cause. Since the feed arm that feeds the lead frame at a pitch is normally driven in common by each processing die as in the above-described embodiment, a stopper or the like that defines the stroke range of the feed arm is provided to set the processing arm when the processing die is set. It is possible to eliminate the error. In this way, it is possible to provide a processing machine that can be used for general purposes for different types of processing dies.

In the above-described embodiment, the feed roller 38 is provided below the rail between the dies as a feed drive unit for feeding the lead frame forward at the rail between the dies, but the configuration of the feed drive unit is other than this. Various methods are possible. For example, in order to more reliably convey the lead frame, a method in which the lead frame is nipped from above and below by a feed roller and sent, or a method in which the rear end of the lead frame is pushed forward by a pusher and the like are considered.

[0020]

According to the lead frame processing machine of the present invention, as described above, there is an error in setting when the processing dies are exchanged and set for processing different types of lead frames, and the processing dies themselves. The error caused by the manufacturing tolerance of the mold can be absorbed and corrected by the rail between the molds, and the work of changing the working mold can be facilitated. In addition, it is possible to design the processing die for processing products with different lead frame feed pitches by matching the action part of the press with the center of load of the processing die, thereby preventing uneven wear of the post and improving accuracy. It has significant effects such as good processing.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of a lead frame processing machine.

FIG. 2 is an explanatory diagram showing a method of feeding a lead frame by a feed roller.

FIG. 3 is a side view of a conventional example of a lead frame processing machine.

[Explanation of symbols]

 Reference Signs List 14 feed rail 16, 18, 34, 36 feed arm 20 rail between molds 22 feed arm 24 type pilot pin 30 first processing type 32 second processing type 38 feed roller 40 confirmation sensor 42 stopper 44 drive rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21D 43/05 B21D 43/02 B21D 53/00 H01L 23/50

Claims (1)

(57) [Claims] 1. A plurality of processing dies are arranged in series, a rail between dies is provided between the respective processing dies to guide the lead frame and transport the lead frame to the next processing die, and the lead arm feeds the lead frame at a pitch. A lead drive machine for transporting the lead frame to the next processing die at the rail position between the dies, and a lead transported by the feed drive unit to the next processing die. A lead frame processing machine provided with a stopper mechanism for locking the frame and positioning the lead frame at a proper position with respect to the processing die.