KR200145798Y1 - Punching apparatus of lead frame - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Type punching device for lead frames.

2. The technical problem to be solved by the invention

Due to the impact of the load applied to the punching shaft, the thin material may cause warpage or irregularities are formed on the material and the back side, and there is a problem of inhibiting uniformity of the produced product.

3. Summary of solution of design

It is an object of the present invention to provide a punching device for letterpress stamping of a lead frame that provides uniform punching pressure to enable mechanical stamping on the leadframe without mechanical deformation, thereby making the product uniform.

4. Important uses of the devise

It is used for punching operations that can perform letterpressing of all thin materials without deformation.

Description

Type punching device for lead frame

1a and 1b is a front view and a side view showing the configuration of an embodiment of a punching device for type stamping the lead frame according to the present invention.

Figure 2 is a flow chart of the punching device for type stamping the lead frame according to the present invention.

* Explanation of symbols for main parts of the drawings

1: stepping motor 2: crank

3,4: First and second punching shaft 5: Letterpress

6: connecting tube 6a: stepped portion

7: fixed pin 8: load cell

9: protective block 10: spring

11: guide block 12: support

13: Main fishery 14: Guide rail

15: leadframe

The present invention relates to a punching device that stamps the type on the lead frame in order to distinguish the lot in the process in the die bonding apparatus for performing the semiconductor package assembly process, in particular to punching at a constant pressure According to the present invention relates to a punching device for type stamping of a lead frame for preventing bending and warping of thin materials.

In the process of assembling semiconductor package, punching work is performed by inserting letter pins with letters stamped on the punching shaft to distinguish the lot in the process of each leadframe. Pressing force was applied to print the lead frame.

Here, due to the impact of the load applied to the punching shaft, a thin material may cause warpage or irregularities are formed on the back side of the material, and there is a problem of inhibiting uniformity of the produced product.

Therefore, the present invention has been devised to solve the above problems, and provides a constant punching pressure so that when the type is stamped on the lead frame, it can be mechanically stamped without appearance modifications to equalize the production product It is an object of the present invention to provide a punching device for printing type of the lead frame.

The present invention for achieving the above object is a stepping motor driven by a control signal applied from the outside; A crank mounted on an axis of the stepping motor to convert its rotational motion into a linear reciprocating motion; A punching shaft connected to the crank and provided with a letter plate at a lower end thereof, the punching shaft being positioned at predetermined intervals so as to perform letter marking on the lead frame while driving up and down; Means for fitting and connecting said punching shaft; Means for supporting the lower end of the punching shaft by fitting; Means for detecting whether the impact load of the punching shaft reaches a set load, which is built in the connecting means; And a control means receiving the output signal of the impact load sensing means and outputting a control signal to the stepping motor so that the punching shaft is returned to its original position after the type is imprinted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 and 2.

1a and 1b is a front view and a side view showing the configuration of an embodiment of a punching device for type inscription of the lead frame according to the present invention; Figure 2 is a flow chart of the punching device for type stamping the lead frame according to the present invention.

In the drawings, 1 is a stepping motor, 2 is a crank, 3 and 4 are first and second punching shafts 5 are letter boards, 6 is a connecting tube, 6a is a stepped portion, 7 is a fixing pin, 8 is a load cell, 9 is a protective block, 10 is a spring, 11 is a guide block, 12 is a support, 13 is a main control part, 14 is a guide rail, and 15 is a lead frame.

The punching device for type stamping the lead frame according to the present invention is implemented to provide an impact load so that only the typeface can be imprinted without damaging the lead frame. Stepping motor (1) for driving the reverse rotation is mounted, the stepping motor (1) is provided with a crank (2) consisting of a combination of two links so that the rotational motion of the stepping motor (1) can be converted into a linear reciprocating motion.

In addition, the crank 2 includes first and second punching shafts 3 and 4 positioned to be spaced apart by a predetermined interval, and the lead frame 15 is disposed at a lower end of the second punching shaft 4. A letterpress plate 5 for letterpressing is provided on the top.

The first and second punching shafts 3 and 4 are connected via a cylindrical connecting tube 6 having a stepped portion 6a formed at its lower end. At this time, the first punching shaft (3) is fixed to the connecting tube (6) by a fixing pin (7) penetrating in the horizontal direction, the second punching shaft (4) is connected to both side projections (4a) It is supported by being caught by the stepped portion 6a of the tube 6.

The connection tube 6 includes a load cell 8 that converts and outputs an impact load into an electrical signal so as to be in contact with the lower end of the first punching shaft 3, and is protected in the connection tube 8. Supported by block 9.

Between the protective block 9 and the second punching shaft 4 is mounted a spring 10 to reduce the impact load.

Here, the load cell 8 continuously checks whether the impact loads of the first and second punching shafts 3 and 4 reach a predetermined load, and outputs a signal when the predetermined load is exceeded.

The main control unit 13 receiving the impact detection signal of the load cell 8 and applying a control signal to the stepping motor 1 so that the first and second punching shafts 3 and 4 are returned after the type is imprinted. It is provided.

In addition, a guide block 11 for guiding the up and down reciprocating movement of the predetermined portion of the second punching shaft 4 and a guide 12 for mounting and supporting the guide block on one side is provided.

Reference numeral 14 is a guide rail and 15 is a lead frame.

The operation state of the present invention configured as described above will be described with reference to the process flow diagram of FIG.

First, when an external sensor senses whether or not the lead frame 15 is placed on both guide rails 14 and is output to the main control unit 13, the main control unit 13 sends a composition signal to the stepping motor. Output to (1) and rotate.

As the stepping motor 1 rotates, the crank 2 composed of the combination of the first and second links converts the rotational motion into a reciprocating motion, wherein the connecting tube 6 is rotated by the rotational angle of the crank 2. The first and second punching shafts 3 and 4, which are connected via, descend and move forward (step 21).

Then, the letter plate 5 mounted on the lower end of the second punching shaft 4 is imprinted by applying an impact load to the lead frame 15 placed on the upper side of the guide rails 14.

At this time, the load cell (8) embedded in the connecting tube (6) detects the impact load applied to the lead frame (15) by the letter board (5), and whether or not exceeding the predetermined load set in the main control portion (13) (Step 22)

When the impact load applied to the lead frame 15 during the punching operation is smaller than the predetermined load, the pressure is continuously increased while the rotation angle of the crank 2 is increased, and the preset load is reached, and the load cell 8 ) Outputs this signal to the main control unit 13.

The main controller 13 applies the control signal to the reverse of the forward rotation of the stepping motor 1 so that the first and second punching shafts 3 and 4 are returned to their original positions (steps 23 and 24).

As described above, according to the present invention, the punching shaft descends and advances at a constant speed by the stepping motor, and the punching pressure is checked by the load cell so that a constant pressure is always applied to the lead frame, thereby precisely controlling the punching pressure. It can prevent bending of the lead frame, prevent the occurrence of irregularities that can be formed in the lower part of the lead frame, achieve uniformity of the produced product, and can reliably perform the printing of all thin materials. Has the effect.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (3)

A stepping motor driven by a control signal applied from the outside; A crank mounted on an axis of the stepping motor to convert its rotational motion into a linear reciprocating motion; A punching shaft connected to the crank and provided with a letter plate at a lower end thereof, the punching shaft being positioned at predetermined intervals so as to perform letter marking on the lead frame while driving up and down; Means for fitting and connecting said punching shaft; Means for supporting the lower end of the punching shaft by fitting; Means for detecting whether the impact load of the punching shaft reaches a set load, which is built in the connecting means; And a control means receiving the output signal of the impact load detecting means and outputting a control signal to the stepping motor so that the punching shaft is returned to its original position after the type is imprinted. The punching device of claim 1, wherein the sensing means is a load cell that converts a load into an electrical signal and outputs the electrical signal. The punching device of claim 1 or 2, further comprising a spring mounted between the spaced spaces of the upper and lower punching shafts to reduce the impact load.