CN115069895A

CN115069895A - Forming process of shielding frame

Info

Publication number: CN115069895A
Application number: CN202210889402.6A
Authority: CN
Inventors: 刘中伟; 吕东启; 沈奇
Original assignee: Suzhou Xiongbang Electronics Co ltd
Current assignee: Suzhou Xiongbang Electronics Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-09-20
Anticipated expiration: 2042-07-27
Also published as: CN115069895B

Abstract

The invention belongs to the technical field of stamping and processing, and relates to a forming process of a shielding frame, which comprises the following steps: punching a positioning hole, roughly cutting an inner hole, and punching a boss and finely cutting the boss; roughly cutting an inner hole to pre-cut a plurality of process holes in a product forming area, wherein the process holes divide the product forming area into a block area in the middle, a frame area on the periphery and a plurality of strip areas connected between the block area and the frame area; bending the strip-shaped area in a boss bending step so that the block-shaped area is higher than the frame-shaped area; and in the boss fine cutting step, the contour of the disc, the contour of the inner section of the broken connecting band and the contour of the inner section of the broken connecting band are cut from the block-shaped area. The process divides a product forming area into a block area and a frame area which are connected by a plurality of strip areas by utilizing the process holes, the block area and the frame area are relatively complete, the bending area is manufactured on the strip areas, the block area and the frame area are positioned on different planes, and then the block area and the frame area are respectively subjected to fine cutting, so that the processing is convenient for die design, and the contour precision of the product can be ensured.

Description

Forming process of shielding frame

Technical Field

The invention relates to the technical field of stamping, in particular to a forming process of a shielding frame.

Background

A shield is a means for shielding electronic signals. The function is to shield the influence of external electromagnetic waves on internal circuits and the outward radiation of the internally generated electromagnetic waves. The component is mainly applied to the fields of mobile phones, GPS and the like, can prevent electromagnetic interference (EMI) and plays a role in shielding elements on a PCB and LCM. The shield frame is a product that is installed in an electronic product to assemble a shield case.

As shown in fig. 1, the main structure of the shielding frame 1 is an outer frame 11 having a folded edge 111, a plurality of salient points 112 are left on the folded edge 111, a disc 12 is left on the inner side of the outer frame 11, the disc 12 needs to be connected to the inner side of the outer frame 11 by using a plurality of connecting bands having a fold, the connecting bands are divided into an outer section with a lower position and an inner section with a higher position by a fold area 15, the outer section is flush with the bottom surface of the outer frame 11, and the inner section is flush with the disc 12; the connecting band comprises a breaking connecting band 13 and a plurality of breaking connecting bands 14, wherein the breaking connecting band 13 is provided with a crease 131, the connecting position of the breaking connecting band 14 and the outer frame 11 is narrow and is provided with a breaking point hole 141, and the outer section of the breaking connecting band 14 is also provided with a raised pull ring 142. The disc 12 is not a part of the shielding frame 1 that needs to be retained in the electronic product, but is located at a position substantially at the center of gravity of the outer frame 11 in order to provide a suction position in the automatic assembly manufacturing, and the disc 12 is slightly higher than the bottom surface of the outer frame 11 because a certain overpressure is needed to clamp the bumps 112 in place during assembly. After the outer frame 11 is assembled, the disc 12 and the connecting band are pulled out, specifically, the outer frame 11 is pressed, all the pull rings 142 are hooked, all the snap-off connecting bands 14 are pulled and broken, and then the snap-off connecting bands 13 are bent and broken at the crease 131, so that the outer frame 11 is assembled. Since the

breakable connecting strips

13 and 14 are thin themselves but are divided into a stepped structure by the bending regions 15, the roundness of the disc 12 and the accuracy of the connection position of the outer frame 11 may be affected by bending after the conventional trimming.

Therefore, it is necessary to design a new molding process to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a forming process of a shielding frame, which can finish the stamping of the shielding frame with high quality.

The invention realizes the purpose through the following technical scheme: a molding process of a shielding frame is used for molding the shielding frame with a disc, an outer frame, a breaking connecting belt and a plurality of breaking connecting belts, wherein the breaking connecting belts and the breaking connecting belts are provided with bending areas for enabling the disc to be higher than the outer frame, and the molding process comprises the following steps:

s1, punching positioning holes: taking the head end and two sides of the metal material belt as positioning, and cutting a plurality of positioning holes in a processing unit range, wherein the processing unit range comprises a product forming area and connection reserved areas positioned on two sides of the product forming area in design, and the positioning holes are positioned in the connection reserved areas;

s2, roughly cutting an inner hole: pre-cutting a plurality of process holes in the product forming area by taking the positioning holes as a reference, wherein the process holes divide the product forming area into a block area in the middle, a frame area at the periphery and a plurality of strip areas connected between the block area and the frame area;

s3, convex forming: bending the strip-shaped area to form the bending area by taking the positioning hole as a reference, so that the block-shaped area is higher than the frame-shaped area;

s4, fine cutting of a boss: and cutting the contour of the disc, the contour of the inner section of the broken connecting band and the contour of the inner section of the broken connecting band in the block area by taking the positioning hole as a reference.

Specifically, the connection reservation region is divided into a first connection reservation region on one side and a second connection reservation region on the other side, and the positioning holes include a first positioning hole located in the first connection reservation region and a second positioning hole located in the second connection reservation region.

Specifically, the step S4 is followed by the following steps:

s5, punching a snap-off area: cutting a plurality of groups of pull holes and C-shaped holes at the connecting positions of the frame-shaped area and the strip-shaped area by taking the positioning holes as the reference;

s6, bending the snapping area: bending the material between each group of the pull holes and the C-shaped hole into pull rings by taking the positioning holes as reference;

s7, inner contour finishing: taking the positioning hole as a reference, cutting out the inner contour of the outer frame, the outer section contour of the stretch-break connecting band and the outer section contour of the break-off connecting band in the product forming area;

s8, outer contour fine cutting: cutting out the outer contour of the outer frame by taking the positioning hole as a reference, and connecting the outer frame on the connection reserved area by virtue of a plurality of connecting materials;

s9, dotting: punching a plurality of salient points on the outer frame by taking the positioning holes as a reference;

s10, flanging: turning up the outer edge of the outer frame along the central connecting line of the salient points as a folded edge by taking the positioning hole as a reference to form a final structure of the shielding frame;

s11, blanking: and cutting the connecting material to make the shielding frame fall down.

Specifically, in the step of punching the positioning holes, a plurality of breakpoint holes are cut in the product forming area, and the breakpoint holes are all located at transition positions of the outer frame and the stretch-break type connecting band.

Specifically, a distance of 2-10mm is reserved between the edge of the fabrication hole and the inner contour of the outer frame.

Specifically, creases are pressed on the broken connecting belts between the step of embossing and the step of flanging.

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

the process divides a product forming area into a block area and a frame area which are connected by a plurality of strip areas by utilizing the process holes, the block area and the frame area are relatively complete, the bending area is manufactured on the strip areas, the block area and the frame area are positioned on different planes, and then the block area and the frame area are respectively subjected to fine cutting, so that the processing is convenient for die design, and the contour precision of the product can be ensured.

Drawings

Fig. 1 is a top view of a shield frame;

FIG. 2 is a diagram illustrating a change of materials and a process;

FIG. 3 is an enlarged view of a portion of FIG. 2 at position A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at position B;

fig. 5 is a partially enlarged view of the position C in fig. 2.

Labeled as:

1-shielding frame, 11-outer frame, 111-folded edge, 112-salient point, 12-disc, 13-breaking connecting band, 131-crease, 14-breaking connecting band, 141-breaking point hole, 142-pull ring and 15-bending area;

2 a-a first connection reservation region, 2 b-a second connection reservation region, 21 a-a first positioning hole, 21 b-a second positioning hole;

3-product forming area, 31-fabrication hole, 32-block area, 33-frame area, 34-strip area, 35-drawing hole, 36-C hole and 37-connecting material.

The positions of the material changes in the steps are shown in bold.

Detailed Description

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

Example (b):

the invention relates to a forming process of a shielding frame, which is used for forming the shielding frame 1 with a disk 12, an outer frame 11, a breaking type connecting belt 13, a plurality of breaking type connecting belts 14 and a plurality of pull rings 142, and comprises the following steps:

s1, punching a positioning hole: as shown in fig. 1 to 3, the head end and both sides of the metal material tape are used as positioning, a plurality of positioning holes are cut in the range of the processing unit, and the range of the processing unit includes a product forming area 3 and connection retaining areas located at both sides of the product forming area 3 in design. The connection reservation section is divided into a first connection reservation section 2a on one side and a second connection reservation section 2b on the other side, and the positioning holes include a first positioning hole 21a located in the first connection reservation section 2a and a second positioning hole 21b located in the second connection reservation section 2 b.

The first positioning hole 21a and the second positioning hole 21b are used to position the entire metal strip with respect to the mold. And the product forming area 3 is used for processing the shielding frame 1. The number of positioning holes can be increased, and the increased positioning holes can be arranged in the connection reserved

areas

2a and 2b and can also be positioned in the cutting range of the product forming area 3.

S2, roughly cutting an inner hole: as shown in fig. 2 and 3, four process holes 31 are pre-cut in the product forming area 3 based on the

positioning holes

21a and 21b, and the process holes 31 divide the product forming area 3 into a block area 32 located in the middle, a frame area 33 located at the periphery, and four strip areas 34 connected between the block area 32 and the frame area 33.

In the design, the disk 12 is located in the range of the block area 32, the outer frame 11 is located in the range of the frame-shaped area 33, and the break-off connecting strips 13 and the break-off connecting strips 14 are located in the four strip-shaped areas 34 and the peripheral positions. The fabrication holes 31 are mainly the profiles of the molding snap-off connecting strips 13 and the stretch-off connecting strips 14 on both sides of the bending zone 15, but leave a certain deformation space for the inner profile of the outer frame 11. A space of 2-10mm is left between the edge of the fabrication hole 31 and the inner contour of the outer frame 11 to be formed. The number of strip-shaped zones 34 is equal to the total number of the break-off webs 13 and the stretch-break webs 14. The number of the broken connecting bands 13 in the same product is only one, the number of the broken connecting bands 14 is 2-3, if the number of the broken connecting bands 14 is increased or decreased, the number of the strip-shaped areas 34 is also increased or decreased, and the number of the fabrication holes 31 is also changed correspondingly.

The step of punching the positioning holes simultaneously cuts three breaking point holes 141 in the product forming area 3, and the breaking point holes 141 are all located at transition positions of the outer frame 11 and the three snap-off connecting bands 14. Since the process hole 31 and the outer frame 11 need to have a proper distance therebetween and the breakpoint hole 141 of the shield frame 1 needs to be located close to the outer frame 11, the breakpoint hole 141 can be drilled while processing the process hole 31. The breakpoint hole 141 has a small aperture and does not greatly affect other positions.

S3, convex forming: as shown in fig. 3, strip-shaped region 34 is bent with reference to positioning

holes

21a, 21b so that block-shaped region 32 is higher than frame-shaped region 33.

This step is intended to form a bending zone 15 on the product. Since the block 32 has not been finely cut, its structure is stable and the middle position of the boss is less likely to be deformed.

S4, fine cutting of a boss: as shown in fig. 3, the contour of the disc 12, the contour of the inner segment of the breakable connecting band 13, and the contour of the inner segment of the breakable connecting band 14 are cut in the block areas 32 with the

positioning holes

21a, 21b as references.

In the previous step, the block areas 32 are integrally raised, so that the precision cutting is also a plane area, the material pressing is convenient, and the forming precision of the disc 12, the break-off connecting band 13 and the pull-off connecting band 14 is high.

S5, punching a snap-off area: as shown in fig. 4, a plurality of sets of pull holes 35 and C-shaped holes 36 are cut at the connecting positions of the frame-shaped area 33 and the strip-shaped area 34 with reference to the

positioning holes

21a, 21 b.

S6, bending the snapping area: as shown in fig. 4, the material between each set of pull holes 35 and C-shaped hole 36 is bent into pull ring 142 with reference to

positioning holes

21a, 21 b.

The primary forming location in this step is within the frame area 33 so that the forming location is also in a single plane, and the two steps are used to form the tab 142 at the location of the breakaway connector band 14. The draw hole 35 and the C-shaped hole 36 are made here in different steps in order to avoid material being punched out by pressing too close together.

S7, inner contour finishing: as shown in fig. 4, the inner contour of the outer frame 11, the outer contour of the snap-off connecting band 14, and the outer contour of the snap-off connecting band 13 are cut out in the product molding zone 3 with the

positioning holes

21a, 21b as references.

Under the condition that the pull ring 142 is formed, the deformation of the material at the inner side of the outer frame 11 is completely finished, and the inner contour trimming of the outer frame 11 can be carried out at the moment, so that the precision of the inner side of the outer frame 11 can be ensured.

S8, outer contour fine cutting: as shown in fig. 2, 4 and 5, the outer contour of the outer frame 11 is cut out based on the

positioning holes

21a, 21b and the outer frame 11 is connected to the first connection retaining area 2a and the second connection retaining area 2b by means of four connecting materials 37.

This step substantially shapes the outer contour of the outer frame 11, but since the outer frame 11 is subsequently processed, it cannot fall off the tape in advance, and it is necessary to leave a thin connecting material 37 to maintain the connection with the first connection retaining area 2a and the second connection retaining area 2 b. So that the subsequent steps can also be continued with the

positioning holes

21a, 21 b.

S9, dotting: as shown in fig. 5, a plurality of bumps 112 are formed on the outer frame 11 based on the

positioning holes

21a and 21 b.

S10, flanging: as shown in fig. 5, the outer edge of the outer frame 11 is turned up to be a folded edge 111 along the central connecting line of the bumps 112 with the

positioning holes

21a and 21b as the reference, thereby forming the final structure of the shield frame 1.

The above two steps are used to form the convex points 112 and the folded edges 111 outside the outer frame 11, so that the shielding frame 1 can be used for clamping. The flanging step may simultaneously press creases 131 in the break-off webs 13. The break-off connecting band 13 can thus be broken off more easily by means of the fold 131.

S11, blanking: as shown in fig. 2 and 5, the connecting member 37 is cut to drop the shield frame 1.

The process utilizes the process holes 31 to divide the product forming area 3 into the block area 32 and the frame area 33 which are connected by the strip areas 34, the block area 32 and the frame area 33 are relatively complete, the bending area 15 is manufactured on the strip areas 34, the block area 32 and the frame area 33 are positioned on different planes, and then the fine cutting is respectively carried out, the die design is convenient, and the contour accuracy of the product can be ensured.

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.

Claims

1. A shielding frame forming process is used for forming a shielding frame (1) with a disc (12), an outer frame (11), a breaking connecting band (13) and a plurality of breaking connecting bands (14), wherein the breaking connecting band (13) and the breaking connecting bands (14) are provided with bending areas (15) enabling the disc (12) to be higher than the outer frame (11), and the shielding frame forming process is characterized in that: the method comprises the following steps:

s1, punching positioning holes: the method comprises the following steps that the head end and two sides of a metal material belt are used as positioning, a plurality of positioning holes (21 a, 21 b) are cut in a processing unit range, the processing unit range comprises a product forming area (3) and connection reserved areas (2 a, 2 b) located on two sides of the product forming area (3) in design, and the positioning holes (21 a, 21 b) are located in the connection reserved areas (2 a, 2 b);

s2, roughly cutting an inner hole: with the positioning holes (21 a, 21 b) as a reference, pre-cutting a plurality of process holes (31) in the product forming area (3), wherein the process holes (31) divide the product forming area (3) into a block area (32) in the middle, a frame area (33) on the periphery and a plurality of strip areas (34) connected between the block area (32) and the frame area (33);

s3, convex forming: bending the strip-shaped area (34) to form the bending area (15) by taking the positioning holes (21 a, 21 b) as a reference, so that the block-shaped area (32) is higher than the frame-shaped area (33);

s4, fine cutting of a boss: and cutting the contour of the disc (12), the contour of the inner section of the break-off connecting band (13) and the contour of the inner section of the break-off connecting band (14) in the block area by taking the positioning holes (21 a and 21 b) as the reference.

2. The molding process of a shield frame according to claim 1, characterized in that: the connection reserved areas (2 a, 2 b) are divided into a first connection reserved area (2 a) on one side and a second connection reserved area (2 b) on the other side, and the positioning holes (21 a, 21 b) comprise a first positioning hole (21 a) located in the first connection reserved area (2 a) and a second positioning hole (21 b) located in the second connection reserved area (2 b).

3. The molding process of a shield frame according to claim 1, characterized in that: the step S4 is followed by the following steps:

s5, punching a snap-off area: a plurality of groups of pull holes (35) and C-shaped holes (36) are cut at the connecting positions of the frame-shaped area (33) and the strip-shaped area (34) by taking positioning holes (21 a, 21 b) as a reference;

s6, bending the snapping area: bending the material between each group of the pulling holes (35) and the C-shaped hole (36) into a pulling ring (142) by taking the positioning holes (21 a, 21 b) as a reference;

s7, inner contour finishing: with the positioning holes (21 a, 21 b) as a reference, cutting out an inner contour of an outer frame (11), an outer section contour of the stretch-breaking type connecting band (14) and an outer section contour of the break-off type connecting band (13) in the product molding area (3);

s8, outer contour fine cutting: cutting out the outer contour of the outer frame (11) by taking the positioning holes (21 a, 21 b) as the reference, and connecting the outer frame (11) on the connection reserved areas (2 a, 2 b) by a plurality of connecting materials (37);

s9, dotting: punching a plurality of salient points (112) on the outer frame (11) by taking the positioning holes (21 a, 21 b) as a reference;

s10, flanging: turning up the outer edge of the outer frame (11) along the central connecting line of the salient points (112) to form a folding edge (111) by taking the positioning holes (21 a, 21 b) as a reference to form a final structure of the shielding frame (1);

s11, blanking: and cutting the connecting material (37) to drop the shielding frame (1).

4. The molding process of a shield frame according to claim 3, characterized in that: and in the step of punching the positioning holes, a plurality of breakpoint holes (141) are cut in the product forming area (3), and the breakpoint holes (141) are all positioned at the transition positions of the outer frame (11) and the stretch-break connecting band (14).

5. The molding process of a shield frame according to claim 3, characterized in that: and a distance of 2-10mm is reserved between the edge of the fabrication hole (31) and the inner contour of the outer frame (11).

6. The molding process of a shield frame according to claim 3, characterized in that: and a crease (131) is pressed on the break-off connecting band (13) between the bumping step and the flanging step.