阅读说明：本技术 一种细端子连续成型方法 (Continuous forming method for fine terminals ) 是由 顾大明 于 2021-09-26 设计创作，主要内容包括：本发明属于冲压加工技术领域,涉及一种细端子连续成型方法,步骤包括：①冲定位孔,②末端预切,③末端倒角,④末端精修,⑤切边,⑥落料；步骤②以定位孔为基准,在产品成型区内切出多个预切孔,预切孔包括靠近金属料带的侧边位置的侧预切孔,侧预切孔的轮廓包括若干并排的凸起结构,凸起结构的凸起高度都不超过2mm,对凸起结构进行倒角和精修之后再进行切边。本方法能够让尺寸较细的端子两端可以先预成型出倒角部分,然后再对端子的其余轮廓进行冲切加工,工艺连续而又确保了端子倒角的结构精度,满足了客户的精度要求。(The invention belongs to the technical field of stamping processing, and relates to a thin terminal continuous forming method, which comprises the following steps: punching a positioning hole, precutting the tail end, chamfering the tail end, finely trimming the tail end, trimming and blanking; and secondly, cutting a plurality of precutting holes in the product forming area by taking the positioning holes as a reference, wherein the precutting holes comprise side precutting holes close to the side edge positions of the metal material belt, the outline of the side precutting holes comprises a plurality of side-by-side raised structures, the height of each raised structure is not more than 2mm, and chamfering and trimming are carried out on the raised structures. The method can lead the two ends of the terminal with thinner size to be preformed with the chamfer part, and then carry out punching processing on the other outlines of the terminal, the process is continuous, the structural precision of the chamfer of the terminal is ensured, and the precision requirement of a customer is met.)

1. A method for continuously forming a fine terminal is characterized by comprising the following steps:

punching a positioning hole: the method comprises the following steps that the head end and the two sides of a metal material belt are used as positioning, a plurality of positioning holes are cut in a processing unit range, the processing unit range comprises an I-shaped connection reserved area and a product forming area located between adjacent connection reserved areas in design, and the positioning holes are located in the connection reserved areas;

secondly, precutting the tail end: taking a positioning hole as a reference, cutting a plurality of precutting holes in the product forming area, wherein the precutting holes comprise side precutting holes close to the side edge of the metal material belt, the outline of the side precutting holes comprises a plurality of side-by-side raised structures, and the raised heights of the raised structures are not more than 2 mm;

③ chamfering the tail end: taking the positioning hole as a reference, and punching reserved chamfers on the front side and the back side of the protruding structure;

fourthly, finishing the tail end: performing small-range shaping on the reserved chamfer by taking the positioning hole as a reference to obtain a final chamfer structure;

fifth, trimming: further cutting the outer contour of the terminal by taking the positioning hole as a reference, but keeping the middle part of the terminal connected with the rest part of the metal material belt;

sixthly, blanking: and cutting the terminals from the metal material strip.

2. The continuous molding method of fine terminals according to claim 1, characterized in that: the positioning holes comprise a first positioning hole positioned on one side of a connection reserved area, a second positioning hole positioned on the other side of the connection reserved area and a third positioning hole positioned in the middle of the connection reserved area, and the distance from the third positioning hole to the edge of the metal material strip is 1/3-1/2 of the total width of the metal material strip.

3. The continuous molding method of fine terminals according to claim 1, characterized in that: each product molding area is designed to be at least three terminals arranged side by side in a close manner.

4. The continuous molding method of fine terminals according to claim 3, characterized in that: sixthly, cutting off the terminal in the middle of the parallel terminals, cutting off the stub bars, and then cutting off the terminals on two sides of the parallel terminals.

5. The continuous molding method of fine terminals according to claim 1 or 3, characterized in that: every product shaping district designs for two at least terminals become to be listed as and is close to the setting, the hole of precutting is including lieing in two between the terminal hole of precutting, the both sides of the profile of well precutting the hole respectively have a plurality of protruding structures side by side, the protruding height of protruding structure is all no longer than 2 mm.

6. The continuous molding method of fine terminals according to claim 1, characterized in that: and in the second step, a plurality of terminal inner holes are cut in the product forming area.

7. The continuous molding method of fine terminals according to claim 1, characterized in that: and fifthly, a terminal bending step is further included, and the suspended parts on the two sides of the terminal are bent forwards or backwards by taking the positioning hole as a reference.

8. The continuous molding method of fine terminals according to claim 7, characterized in that: the terminal bending step is divided into two steps of 45-degree bending and 90-degree bending.

Technical Field

The invention relates to the technical field of stamping, in particular to a continuous forming method of a thin terminal.

Background

Terminals are metal products, generally relatively slender parts, used to conduct various electronic components. For the convenience of plugging, the terminal end is often formed into a truncated pyramid structure with a smaller outer side. The terminals are obtained from metal material belts with sheet structures through multiple trimming, if most of the outlines of the terminals are formed, the forming of the tail ends is not good, the slender terminal structures are deformed when the tail ends are pressed, and the technical difficulty of reshaping and positioning is high. The thinner the terminal, the easier it is to break.

Therefore, it is necessary to design a new molding method to make the terminal obtain the required structure quickly and accurately.

Disclosure of Invention

The invention mainly aims to provide a thin terminal continuous molding method which can complete the structural molding of a thin terminal with high precision.

The invention realizes the purpose through the following technical scheme: a method for continuously forming a fine terminal comprises the following steps:

punching a positioning hole: the method comprises the following steps that the head end and the two sides of a metal material belt are used as positioning, a plurality of positioning holes are cut in a processing unit range, the processing unit range comprises an I-shaped connection reserved area and a product forming area located between adjacent connection reserved areas in design, and the positioning holes are located in the connection reserved areas;

secondly, precutting the tail end: taking a positioning hole as a reference, cutting a plurality of precutting holes in the product forming area, wherein the precutting holes comprise side precutting holes close to the side edge of the metal material belt, the outline of the side precutting holes comprises a plurality of side-by-side raised structures, and the raised heights of the raised structures are not more than 2 mm;

③ chamfering the tail end: taking the positioning hole as a reference, and punching reserved chamfers on the front side and the back side of the protruding structure;

fourthly, finishing the tail end: performing small-range shaping on the reserved chamfer by taking the positioning hole as a reference to obtain a final chamfer structure;

fifth, trimming: further cutting the outer contour of the terminal by taking the positioning hole as a reference, but keeping the middle part of the terminal connected with the rest part of the metal material belt;

sixthly, blanking: and cutting the terminals from the metal material strip.

Specifically, the positioning holes comprise a first positioning hole located on one side of a connection reserved area, a second positioning hole located on the other side of the connection reserved area and a third positioning hole located in the middle of the connection reserved area, and the distance from the third positioning hole to the edge of the metal material strip is 1/3-1/2 of the total width of the metal material strip.

Specifically, each product molding area is designed to be at least three terminals arranged side by side and close to each other.

Further, cutting off the terminal in the middle of the parallel terminals, cutting off the stub bars, and cutting off the terminals on two sides of the parallel terminals.

Furthermore, every product molding district designs for at least two terminals become to be listed as and closely set up, the hole of precutting is including lieing in two and precutting the hole in between the terminal, the both sides of the profile of well precutting the hole respectively have a plurality of protruding structures side by side, the protruding height of protruding structure is all no longer than 2 mm.

Specifically, in the second step, a plurality of terminal inner holes are cut in the product forming area.

And in the fifth step, a terminal bending step is further included, and the suspended parts on the two sides of the terminal are bent forwards or backwards by taking the positioning hole as a reference.

Further, the terminal bending step is divided into two steps of 45-degree bending and 90-degree bending.

The technical scheme of the invention has the beneficial effects that:

the method can lead the two ends of the terminal with thinner size to be preformed with the chamfer part, and then carry out punching processing on the other outlines of the terminal, the process is continuous, the structural precision of the chamfer of the terminal is ensured, and the precision requirement of a customer is met.

Drawings

FIG. 1 is a sequence diagram of the metal strip;

FIG. 2 is an enlarged view of a portion of the portion A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 at position B;

FIG. 4 is an enlarged view of a portion of FIG. 1 at position C;

fig. 5 is a partial enlarged view of a portion D in fig. 1.

Labeled as:

1-a metal material belt;

2 a-a first positioning hole, 2 b-a second positioning hole, 2 c-a third positioning hole;

3 a-side pre-cut hole, 3 b-middle pre-cut hole, 31-convex structure, 32 a-reserved chamfer and 32 b-final chamfer;

4 a-first terminal, 4 b-second terminal, 4 c-third terminal, 41-terminal bore.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Example (b):

the invention relates to a method for continuously forming a thin terminal, which comprises the following steps:

firstly, the head end and the two sides of the metal material belt 1 are used as positioning, and a plurality of positioning holes are cut in the range of the processing unit. The processing unit range comprises an I-shaped connection reserved area and a product forming area located between adjacent connection reserved areas in the design, the positioning holes are located in the connection reserved area, and the product forming area is used for processing terminal products. As shown in fig. 1, the positioning hole is used as a positioning reference in the subsequent stage punching. The positioning holes include a first positioning hole 2a located at one side of the connection reservation region, a second positioning hole 2b located at the other side of the connection reservation region, and a third positioning hole 2c located at the middle of the connection reservation region. The distance from the third positioning hole 2c to the edge of the metal tape 1 is 1/3-1/2 of the total width of the metal tape 1. The first positioning hole 2a and the second positioning hole 2b are used for positioning the position of the whole metal material belt 1 relative to the die, the third positioning hole 2c is used for positioning a product forming area, and the position of the third positioning hole 2c is close to the connecting position of the terminal and the connecting reserved area, so that under multiple times of punching, the die positioning column can pull the product material by the third positioning hole 2c, and the material cutting error caused by the position deviation of the terminal is avoided.

And secondly, cutting a plurality of precutting holes in a product forming area by the precutting punch by taking the first positioning hole 2a, the second positioning hole 2b and the third positioning hole 2c as references. The side edge position close to the metal material belt 1 is a side precutting hole 3a, and the outline of the side precutting hole 3a comprises three side-by-side raised structures 31; the central position of the product forming area is a middle precutting hole 3b, and two sides of the outline of the middle precutting hole 3b are respectively provided with three parallel convex structures 31; the projection height of the projection structure 31 does not exceed 2 mm. As shown in fig. 2, the protruding structures 31 are the initial form of the terminal ends, and the protruding structures 31 are to be deformed into a truncated pyramid structure. In practical application, more terminals can be designed in the product forming area side by side, the structure of the terminals can be the same or different, and more terminals can be arranged in a row, so that the area of the die can be fully utilized, more products can be formed at one time, and the production efficiency is improved. In the present embodiment, each product forming area is designed to have three terminals in each row and two terminals in each column, so that each product forming area has two side pre-cut holes 3a and one middle pre-cut hole 3 b. In each more row of terminals, the number of the side precutting holes 3a is unchanged, one middle precutting hole 3b is added, and the increase of the number of the precutting holes can only increase the width of the precutting holes without increasing the number of the precutting holes. Thus, the width of the pre-cut holes (the side pre-cut hole 3a and the middle pre-cut hole 3 b) is not limited to the width of a single terminal, and a positioning position of the chamfering punch is also provided, so that the deformation of the convex structure 31 is in a controllable range. This step also enables the terminal inner bore 41 to be cut in the product forming zone using an inner bore punch. The terminal bores 41 are round holes in the terminals and some of the terminals will pass through the terminal bores 41 to increase the connection location. The terminal inner hole 41 is located in the middle of the terminal to be formed, namely, a certain distance is reserved between the terminal inner hole and the protruding structure 31, so that the forming of the protruding structure 31 cannot be influenced even if the terminal inner hole is simultaneously processed, the length of one station is reduced, and the mold opening cost is also reduced. This operation can also be omitted if the terminal does not have a terminal bore.

And thirdly, the die takes the first positioning hole 2a, the second positioning hole 2b and the third positioning hole 2c as the reference, and reserved chamfers 32a are punched on the front side and the back side of the convex structure 31 through chamfer punch heads positioned on the front side and the back side of the die. As shown in fig. 2, in the case where the pre-cut holes (the side pre-cut hole 3a and the middle pre-cut hole 3 b) have exposed the protruding structure 31 to be chamfered, both sides of the protruding structure 31 are chamfered into the pre-chamfer 32a of the acute angle structure. Because the pre-cut merely exposes the profile of the terminal end and the remainder of the terminal is not yet molded, the chamfering of the raised structure 31 does not cause significant material flow in the unmolded portion of the terminal.

And fourthly, the die performs small-range shaping on the reserved chamfer 32a through a finishing punch by taking the first positioning hole 2a, the second positioning hole 2b and the third positioning hole 2c as references to obtain a final chamfer 32b structure. As shown in fig. 2, the pre-cut holes (side pre-cut hole 3a and middle pre-cut hole 3 b) are located at the position where the finishing punch is retracted, so that the final chamfer 32b has a truncated pyramid structure. The finishing operation also does not cause a severe flow of material in the unmolded portion of the terminal because other portions except the terminal ends are unmolded.

And fifthly, further cutting the outline of the terminal by using the first positioning hole 2a, the second positioning hole 2b and the third positioning hole 2c as references, but leaving the middle part of the terminal connected with the rest part of the metal material belt 1. In order to avoid cutting too much at one time, the outer contour can be exposed by means of step punching. This step is to shape the main profile of the terminal so that it is only cut when a narrow connection location, etc., is blanked, as shown in fig. 3.

Sixthly, as shown in fig. 4, the mold bends the suspended portions at the two sides of the terminal with reference to the first positioning hole 2a, the second positioning hole 2b and the third positioning hole 2c, so that the two ends of the terminal (the first terminal 4a, the second terminal 4b and the third terminal 4 c) are bent in opposite directions. Many terminal structures are not flat strip-shaped structures, so that a terminal bending step can be added when the materials are subjected to end chamfer forming and edge cutting and are still connected on the metal material belt 1, and continuous manufacturing of the bent terminals can also be realized. The two ends of the terminal can be bent in the positive and negative directions, and the bending can be realized through different directions of the bending punch heads. In practical applications, if the terminal has no bevel, this step can be omitted. As shown in fig. 4, the terminal bending step is divided into two steps of 45 ° bending and 90 ° bending. Thus, the terminal can be prevented from being broken due to overlarge one-time bending angle.

And cutting the terminals 4a, 4b and 4c from the metal material belt 1. The specific operation is as follows: the second terminal 4b is cut out, and then the stub is cut out, and then the first terminal 4a and the third terminal 4c are cut out. Since the mold positions the terminals by using the third positioning hole 2c, the first terminal 4a and the third terminal 4c are nearest to the third positioning hole 2c, and the second terminal 4b is farthest from the third positioning hole 2c, the second terminal 4b is suitable for blanking first, so that the positions of the first terminal 4a and the third terminal 4c can be ensured with accuracy, and the blanking is performed again after the next time. In the case where the first terminal 4a and the third terminal 4c have different structures, the respective blanks may be divided into two times. As shown in fig. 5, the product is thus obtained.

The method can lead the two ends of the terminal with thinner size to be preformed with the chamfer part, and then carry out punching processing on the other outlines of the terminal, the process is continuous, the structural precision of the chamfer of the terminal is ensured, and the precision requirement of a customer is met.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.