CN100454503C - Manufacturing method of triode lead frame - Google Patents

Abstract

The invention discloses a method for manufacturing a triode lead frame. Tape (5, 6, 7, 8); b. the head (9) of the lead frame tape (5, 6, 7, 8) and the outer edge of the lead frame tape head (9) The area (B) formed by the slitting point (3) or/and the slitting strip is electroplated; c. cutting off the slitting point (3, 4) or/and the slitting strip to obtain four separate single-row lead frame rolls Strips (5, 6, 7, 8); d. cutting said single-row lead frame roll tape (5, 6, 7, 8) to obtain a plurality of lead frame sheets, each lead frame sheet comprising a plurality of leads frame. The manufacturing method has high production efficiency, stable quality and low production cost.

Description

Manufacturing method of triode lead frame

technical field

The invention relates to a method for manufacturing a lead frame, in particular to a method for manufacturing a triode lead frame.

Background technique

There are generally two methods for manufacturing lead frames in the prior art, one is to manufacture the lead frame by etching; the other is to manufacture the lead frame by stamping. Compared with the etching method, the method of manufacturing the lead frame by punching has the capability of high-speed processing. But the prior art manufactures the triode lead frame by stamping such as TO-92 (industry general model) the manufacture method of the triode lead frame, is to punch out the lead frame tape of single row at first, then through the electroplating process to the lead frame coil of single row The head region of the tape is plated and then enters a separation process to separate the lead frame web into individual lead frame sheets, wherein each lead frame sheet includes a plurality of lead frames. Because the lead frame tapes punched out by this method are single-row, so its production efficiency is low, quality control is not stable enough, and the cost of manpower and material consumption in each process is high. Especially in the electroplating process, energy is wasted and increased. The cost of electroplating, so the production cost is relatively high; and due to the dispersion of electroplating, the harmful substances discharged by electroplating are increased, and the pollution to the environment is aggravated.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for manufacturing a lead frame with high production efficiency, stable quality and low production cost.

The technical solution of the present invention is: provide a kind of manufacturing method of triode lead frame, comprising:

a. Punch out four interconnected single-row lead frame tapes from the same workpiece, and the single-row lead frame tapes pass through the slitting points or slitting strips arranged on the outer edge of the lead frame tape head and The slitting points or slitting strips located on the outer edge of the lead frame tape edge are connected side by side, or

The single row of lead frame tapes are arranged side by side with each other through the cut points or cut strips arranged on the outer edge of the lead frame tape head and the cut points or cut strips arranged on the outer edge of the lead frame tape edge strips. catch;

b. Electroplating the head of the lead frame tape and the area formed by the cutting point or/and the cutting strip located on the outer edge of the head of the lead frame tape;

c, cutting off the slitting point or/and slitting strip to obtain four separate rows of single-row lead frame tapes;

d. Cutting the single-row lead frame tape to obtain a plurality of lead frame sheets, and each lead frame sheet includes a plurality of lead frames.

The single row of lead frame tapes are arranged side by side with each other through the cut points or cut strips arranged on the outer edge of the lead frame tape head and the cut points or cut strips arranged on the outer edge of the lead frame tape edge strips. connected, or the single row of lead frame tapes pass through the cutting point or slitting strip set on the outer edge of the lead frame tape head and the cutting point or cutting strip set on the outer edge of the lead frame tape edge The bars are connected side by side, and are preferably mutually symmetrically connected side by side.

The manufacturing method of the present invention makes the four-row single-row lead frame tapes connected to each other form two electroplating areas. The purpose of electroplating in the electroplating area.

The (stamping) manufacturing method of the triode lead frame of the present invention is compared with the manufacturing method of the triode lead frame of the prior art by punching such as the triode lead frame that the model is TO-92 single row, owing to adopted four rows of lead frame tapes at the same time Stamping is carried out, and four rows of lead frame tapes are electroplated at the same time, and then separated, so the production efficiency of each process is greatly improved. From the point of view of production cost, firstly, it greatly reduces the mold and its maintenance costs in the stamping and separation process, and greatly saves labor costs and material consumption costs; secondly, in the electroplating process, it saves energy and reduces the cost of electroplating The labor cost and material consumption cost of the process. Therefore, its production cost is relatively low. At the same time, since multiple rows of lead frame tapes are manufactured and controlled at the same time, the product quality is stable. Due to the concentrated production of the electroplating process, the harmful substances discharged by electroplating are reduced, and the pollution to the environment is reduced.

Description of drawings

FIG. 1 is a schematic diagram of a single-row lead frame tape and an electroplating area punched out by a manufacturing method in the prior art.

Fig. 2 is a schematic diagram of a four-row (TO-92) lead frame punched out by the manufacturing method of the triode lead frame of the present invention, a schematic diagram of an embodiment of the tape, the connection part and the electroplating area.

3 is a schematic diagram of another embodiment of the four-row (TO-92) lead frame punched out by the manufacturing method of the triode lead frame of the present invention, the connection part and the electroplating area.

Fig. 4 is a schematic diagram of another embodiment of the four-row (TO-92) lead frame punched out by the manufacturing method of the triode lead frame of the present invention, the connection part and the electroplating area.

As shown in the figure 1, middle rib, 2, side strip, 3, 4, cutting point, 5, 6, 7, 8, single-row lead frame tape, 9, lead frame tape head, 10, 11, cut Bar, A, the prior art tape plating area, B, the present invention tape plating area, W1, the width of the cutting point 3, W2, the width of the lead frame tape head 9.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the prior art manufactures the triode lead frame by stamping, such as the manufacturing method of the TO-92 single-row triode lead frame, the TO-92 single-row lead frame tape that is punched out, and its connecting part is 1 and side strip 2, the area that needs to be electroplated is the area of the head 9 of the lead frame tape, that is, the area A shown in the figure. When the lead frame tape is separated, cut the middle rib 1 and the side tape 2 horizontally (customarily called the longitudinal direction in the industry, that is, along the vertical direction in Figure 1), and then obtain multiple lead frame sheets, and each lead frame sheet includes multiple lead frame.

As shown in Figure 2, the first embodiment of the manufacturing method of the triode lead frame of the present invention:

a. Stamping lead frame tapes: Punch out four interconnected single-row lead frame tapes 5, 6, 7, 8 from the same workpiece, and the connecting parts are also the middle rib 1 and the side tape 2. The single-row lead frame tapes 5, 6, 7, 8 pass through the cutting point 3 arranged on the outer edge of the lead frame tape head 9 and the cutting point arranged on the outer edge of the lead frame tape side tape 2 4 are symmetrically connected side by side. Each splitting point 3 and splitting point 4 are respectively connected to a pair of lead frames symmetrically connected side by side, so that two electroplating regions B are formed after being distributed in this way.

The width W1 of the cutting point 3 located on the outer edge of the lead frame tape head 9 is greater than the width W2 of the lead frame tape head 9, so that the lead frame tape head 9 is not affected when the cut point 3 is cut off. The edges are smooth and even.

Due to various reasons, the pulling force of the equipment for pulling the tape in the electroplating process is different. When it is estimated that the pulling force of the equipment is small, the cutting point 3 located on the outer edge of the lead frame tape head 9 is within the length of the lead frame tape. In this way, when the pulling force of the equipment is small, the connection strength between the two rows of single-row lead frame tapes in the production process is ensured, and the electroplating area is saved.

b. Electroplating: Electroplating is performed on the region B formed by the head 9 of the lead frame tape 5 , 6 , 7 , 8 and the cutting point 3 arranged on the outer edge of the lead frame tape head 9 .

Separation:

c. cut off the cutting point 3 and the cutting point 4 to obtain four separate rows of single-row lead frame tapes 5, 6, 7, and 8;

d. Cut the single-row lead frame tapes 5, 6, 7, and 8 horizontally (customarily called longitudinal in the industry, that is, along the vertical direction in Fig. 1) to obtain a plurality of lead frame sheets, each lead frame sheet Also includes a plurality of lead frames.

As shown in Figure 3, the second embodiment of the manufacturing method of the triode lead frame of the present invention:

The manufacturing method is basically the same as that of the first embodiment, the difference is that: when the tension of the device is expected to be moderate, between the single-row lead frame tapes 5 and 6 and between the single-row lead frame tapes 7 and 8 are provided The slitting strip 10 and the slitting point 3 on the outer edge of the lead frame winding head 9 are symmetrically connected side by side. The arrangement of the slitting strip 10 and the slitting point 3 in the length direction of the lead frame tape is: a slitting strip 10 appears every other lead frame, and the slitting strip 10 connects two pairs of lead frames symmetrically connected side by side. , there is a cutting point 3 every other lead frame, and this cutting point 3 is connected to a pair of lead frames symmetrically connected side by side, and then a cutting strip 10 appears once every other lead frame, and so on. The electroplating and cutting in the first embodiment only involve the cutting point 3 and the cutting point 4 , while the electroplating and cutting in this embodiment also include the cutting strip 10 . The purpose of adopting this embodiment is to ensure the connection strength between the two rows of single-row lead frame tapes in the production process when the tension of the equipment is moderate, that is, no deformation occurs under any circumstances, so as to facilitate the smooth progress of the following processes.

As shown in Figure 4, the third embodiment of the manufacturing method of the triode lead frame of the present invention:

The manufacturing method is basically the same as that of the first embodiment, with the difference that: when the device is expected to have a relatively large pulling force, between the single-row lead frame tapes 5 and 6 and between the single-row lead frame tapes 7 and 8 are set The slitting strips 11 on the outer edge of the lead frame take-up head 9 are symmetrically connected side by side. The slitting strip 11 extends along the length direction of the lead frame tape. The electroplating and cutting in the first embodiment involve the cutting point 3 and the cutting point 4 , while the electroplating and cutting in this embodiment involve the cutting strip 11 and the cutting point 4 . The purpose of adopting this embodiment is to ensure the connection strength between the two rows of single-row lead frame tapes in the production process, that is, no deformation under any circumstances, so as to facilitate the smooth progress of the following processes.

The above-mentioned embodiments are used to explain the present invention, but not to limit the present invention. Within the protection scope of the claims of the present invention, non-substantial modifications and changes made to the present invention, such as the mutual exchange and separation of the cutting points 3, 4 and the cutting strips 10, 11 in the three embodiments. The change of the cutting point and the specific width of the slitting strip, etc., all fall within the protection scope of the present invention.

Claims (2)

1. A method for manufacturing a triode lead frame, comprising: a. Punch out four interconnected single-row lead frame tapes (5, 6, 7, 8) from the same workpiece, and the single-row lead frame tapes (5, 6, 7, 8) pass through each other The cutting point (3) or cutting strip (10, 11) arranged on the outer edge of the lead frame tape head (9) and the cutting point (4) arranged on the outer edge of the lead frame tape side tape (2) or the slitting strips are joined side by side, or The single-row lead frame tapes (5, 6, 7, 8) pass through the cutting point (3) and the cutting strip (10) arranged on the outer edge of the lead frame tape head (9) and are arranged on the The slitting points (4) or slitting strips on the outer edge of the lead frame tape side strip (2) are connected side by side, b. The head (9) of the lead frame tape (5, 6, 7, 8) and the cutting point (3) or/and cutting strip arranged on the outer edge of the lead frame tape head (9) (10,11) The formed region (B) is electroplated; c. Cut off the slitting points (3, 4) or/and slitting strips (10, 11) to obtain four separate rows of single-row lead frame tapes (5, 6, 7, 8): d. Cutting the single row of lead frame tapes (5, 6, 7, 8) to obtain a plurality of lead frame sheets, each lead frame sheet including a plurality of lead frames. 2. The method for manufacturing a triode lead frame according to claim 1, characterized in that: said single-row lead frame tapes (5, 6, 7, 8) pass through the lead frame tape head (9 ) on the outer edge of the cutting point (3) or the cutting strip (10, 11) and the cutting point (4) or the cutting strip on the outer edge of the lead frame tape (2) are connected side by side, or the The single-row lead frame tapes (5, 6, 7, 8) pass through the cutting point (3) and the cutting strip (10) arranged on the outer edge of the lead frame tape head (9) and the lead wires The slitting points (4) or slitting strips on the outer edge of the frame tape side band (2) are connected side by side, all referring to mutual symmetric side by side connection.

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