CN215918961U

CN215918961U - Punching die cutter for lead frame

Info

Publication number: CN215918961U
Application number: CN202122224567.5U
Authority: CN
Inventors: 陈骆峥晗; 余高理; 徐洪祥
Original assignee: Shaoxing Yihua Electronic Technology Co ltd
Current assignee: Shaoxing Yihua Electronic Technology Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-03-01
Anticipated expiration: 2031-09-14

Abstract

The utility model discloses a lead frame punching die cutter which comprises an upper cutter and a lower cutter, wherein the upper cutter is positioned above the lower cutter, and the lower end of the upper cutter is provided with a notch. The utility model sets a splayed notch on the end face of the upper knife of the knife, reduces the contact area between the end face and the leftover bits and pieces, reduces the blanking force of the knife, is not easy to stick the waste bits, ensures that the knife is not easy to wear, and reduces the mechanical noise emitted by the die.

Description

Punching die cutter for lead frame

Technical Field

The utility model relates to the technical field of lead frame processing, in particular to a cutter of a lead frame punching die.

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 leading-out end of an internal circuit of a chip and an external lead by means of bonding materials (gold wires, aluminum wires and copper wires) 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 sealing and testing process comprises the following steps: die bonding, sintering (routing), plastic packaging, electroplating, punching and molding, and testing. The product is electroplated and then flows into a punching process, as shown in fig. 1, the lead frame 1 comprises a pin 11 positioned in the middle and a middle rib 12 connected with the pin 11, the middle rib 12 is separated from the pin 11 in the punching process, and the cut middle rib 12 serving as corner waste falls into a waste bin under the action of vacuum suction. As shown in fig. 4, the punching die comprises a right-angle upper knife 2 ' and a lower knife 3, the right-angle upper knife 2 ' is located above the lead frame 1, the upper end of the lower knife 3 is abutted to the lower end of the middle part of the lead frame 1, and the punching action is completed by the downward movement of the right-angle upper knife 2 '. In order to avoid the situation that the service life of the die is shortened due to overlarge stress of the die in the punching process, the punching die adopts a sectional progressive punching mode, namely, one product can be punched in 2 steps, a product drawing after the first-step punching is shown in a drawing 2, a part of the middle ribs 12 are already cut, a product drawing after the second-step punching is shown in a drawing 3, all the middle ribs 12 are cut, and the punching is finished.

The in-process of leftover bits is being inhaled the waste bin, when the incision edge department of sword 2 'and lower sword 3 on the right angle, the leftover bits can produce the deckle edge that has certain length (general deckle edge length is less than or equal to 0.1mm for qualified), take the deckle edge's leftover bits will adhere to the sword 2 'on the right angle sometimes, this is because the terminal surface of sword 2' on the right angle is the plane, well muscle 12 pastes the terminal surface of sword 2 'on the right angle completely and punches, the contact plane is bigger, so very easily do not separate with the terminal surface of sword 2' on the right angle glues together. The waste materials of the corner can sometimes fall onto the product along with the movement of the right-angle upper knife 2' and the progressive product, and the die can crush the product when the product is punched next time, so that the product is scrapped. According to statistics, the product yield influenced by the reasons is only below 90%, and the resources are greatly wasted. Meanwhile, when the end face of the right-angle upper knife 2 'is integrally contacted with the middle rib 12 during punching, the punching force applied to the right-angle upper knife 2' is larger, the right-angle notch is extremely easy to wear, the length of the rough edge at the edge of the notch is gradually increased, and larger mechanical noise is generated instantly after cutting off.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a die cutting tool for a lead frame, which solves the problems that corner waste materials are adhered to the end face of the tool and are not easy to separate, the edge of a cut is rough and has overlarge noise in die cutting and forming.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a die-cut mould cutter of lead frame, includes upper slitter and lower sword, the upper slitter is located the top of lower sword, the lower extreme of upper slitter is equipped with the breach.

The notch is splayed.

The lower end surface of the upper knife comprises two inclined surfaces, and the inclined surfaces extend from the middle of the lower end surface of the upper knife to two sides.

The included angle A between the inclined plane and the horizontal line is 10 degrees.

The lead frame has been placed to the centre of going up sword and lower sword, the lead frame includes pin and well muscle, the lower extreme of muscle in the upper end butt of lower sword, go up the sword and be located the upper end of muscle in corresponding.

The utility model has the beneficial effects that: the splayed notch is formed in the end face of the upper cutter of the cutter, so that the contact area between the end face and corner waste is reduced, the blanking force of the cutter is reduced, the waste is not easy to stick, the cutter is not easy to wear, and the mechanical noise generated by the mold is reduced.

Drawings

FIG. 1 is a schematic view of a lead frame to be die cut;

FIG. 2 is a schematic view of the lead frame after the first step of die cutting;

FIG. 3 is a schematic view of a die-cut completed lead frame;

FIG. 4 is a schematic diagram of the prior art;

FIG. 5 is a schematic view of the present invention;

FIG. 6 is a side view of FIG. 5;

fig. 7 is a schematic view of the upper blade 2.

In the figure: the lead frame comprises a lead frame 1, a pin 11, a middle rib 12, an upper knife 2, a right-angle upper knife 2', a notch 21, an inclined surface 22 and a lower knife 3.

Detailed Description

The utility model is further described with reference to the accompanying drawings and the detailed description below:

as shown in fig. 5-7, the lead frame punching die cutter comprises an upper cutter 2 and a lower cutter 3, wherein the upper cutter 2 is positioned above the lower cutter 3, and a notch 21 is formed at the lower end of the upper cutter 2.

The notch 21 is in a shape of a Chinese character 'ba', that is, the lower end of the upper knife 2 is higher in the middle and lower in both sides, the lower end of the upper knife 2 includes two inclined planes 22, and the inclined planes 22 extend from the middle of the lower end of the upper knife 2 to both sides. The included angle a between the inclined surface 22 and the horizontal line is 10 degrees, so that in the process of downward punching by the upper knife 2, two sides firstly touch the part to be punched of the lead frame 1.

Lead frame 1 has been placed to the centre of upper slitter 2 and lower slitter 3, lead frame 1 includes pin 11 and well muscle 12, the lower extreme of muscle 12 in the upper end butt of lower slitter 3, upper slitter 2 is located the upper end of muscle 12 in the correspondence.

The lower end of the upper knife 2 is provided with the notch 21, so that the upper knife 2 is changed from integral surface contact into inclined surface contact when being punched, a scissor-shaped punching is formed, the contact area is reduced, the upper knife 2 is not easy to stick to the inclined surface 22 at the lower end of the upper knife 2, the punching force applied to the notch edge of the upper knife 2 is also reduced, the edge of the upper knife 2 is not easy to wear, less mechanical noise is generated, the integral service life of the knife is prolonged, the use cost of a company is saved, and the product yield is improved.

The notch 21 of the present invention may also be circular arc, that is, the lower end of the upper knife 2 is transited by circular arc, which can also achieve the above-mentioned effects.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a die-cut mould cutter of lead frame, includes top knife (2) and bottom knife (3), its characterized in that: the utility model discloses a sword, including last sword (2), lower extreme, upper slitter (2) is located the top of lower sword (3), the lower extreme of upper slitter (2) is equipped with breach (21), breach (21) are the splayed, the lower terminal surface of upper slitter (2) includes two inclined planes (22), inclined plane (22) extend to both sides from the centre of the lower terminal surface of upper slitter (2).

2. The lead frame piercing die cutter of claim 1, wherein: the included angle A between the inclined plane (22) and the horizontal line is 10 degrees.

3. The lead frame piercing die cutter of claim 1, wherein: the lead frame (1) has been placed to the centre of going up sword (2) and lower sword (3), lead frame (1) is including pin (11) and well muscle (12), the lower extreme of muscle (12) in the upper end butt of lower sword (3), go up the upper end that sword (2) are located corresponding well muscle (12).