A local electroforming steel mesh processing technology based on micro welding technology

Abstract

The present invention discloses a steel mesh processing process based on micro-welding technology, wherein the steel mesh includes a plurality of first-class openings and second-class openings, and comprises the following steps: making an electroformed orifice plate, making a steel mesh blank, micro-welding, post-processing, mesh bonding and other process steps. The present invention adopts a composite process to convert the local printing demoulding area on the steel mesh into an electroformed orifice plate by electroforming. Laser micro-welding technology is used to embed into the opening part of the corresponding steel mesh blank, thereby realizing the use of electroforming for local openings and laser technology for most openings, thereby combining the advantages of electroforming with laser processing, which not only ensures the printing quality requirements of the small holes, but also reduces the overall processing cost and improves the processing efficiency.

Description

Technical Field

[0001] The invention relates to the field of electronic assembly industry, in particular to a local electroforming steel mesh processing technology based on micro-welding technology, and in particular to a processing technology of a laser template for SMT. Background Art

[0002] Laser templates for SMT are the mainstream application in the PCBA assembly industry. With the miniaturization of devices, especially the introduction of 0.35mm pitch CSP devices for wireless communications, the accuracy of templates processed by laser alone can no longer meet the design requirements. The processing process involves demolding, deburring, grinding the hole wall, and removing the residue, which greatly increases the difficulty of processing due to the smaller hole spacing. Although the performance of templates processed by pure electroforming meets the requirements, the processing price is more than 5 times that of laser processing, and the processing cycle is long, which is not suitable for widespread use. Summary of the invention

[0003] The purpose of the present invention is to provide a local electroforming steel mesh processing technology based on micro-welding technology to solve the above-mentioned technical problems.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A steel mesh processing process based on micro-welding technology, the steel mesh includes a plurality of first-class openings and second-class openings, characterized in that it includes the following steps:

[0006] 1) According to the design drawing of the steel mesh, the first type of openings are divided into regions and individually made into a plurality of electroformed orifice plates, each of which includes a plurality of the first type of openings;

[0007] 2) According to the design drawing of the steel mesh, a steel plate of designed size is cut from the stainless steel substrate as a steel mesh blank;

[0008] 3) laser cutting the second type of openings on the steel mesh blank;

[0009] 4) laser cutting a plurality of welding holes of a size corresponding to the electroformed orifice plate on the steel mesh blank;

[0010] 5) placing the electroformed orifice plate in the welding hole of corresponding shape and fixing it, and welding the electroformed orifice plate and the steel mesh blank into one by micro welding;

[0011] 6) Gluing the steel mesh blank to the mesh frame, and then baking to obtain the finished steel mesh.

[0012] Preferably, the area ratio of the first type of openings is greater than 0.5 and less than 0.66; the area ratio of the second type of openings is greater than 0.66.

[0013] Preferably, the electroformed orifice plate is a nickel sheet, and the first type of openings is processed by an electroforming process; the area ratio of the first type of openings is greater than 0.5 and less than 0.66.

[0014] Preferably, the electroforming process comprises the following steps:

[0015] 2.1) Prepare a substrate, using a copper plate or a stainless steel plate as the substrate;

[0016] 2.2) pasting a photosensitive film, pasting a photosensitive film on the substrate;

[0017] 2.3) Exposure imaging, using an exposure machine or LDI to expose on the photosensitive film to form an image of the electroformed orifice plate;

[0018] 2.4) Development: The photosensitive film other than the openings to be electroformed is dissolved by development to form a negative opening pattern;

[0019] 2.5) Electroforming: immersing the substrate in an electroforming tank, and atomically depositing a nickel alloy sheet on the substrate through process parameters such as current and temperature;

[0020] 2.6) Finished product: the nickel alloy sheet is peeled off from the substrate and the electroformed orifice plate is obtained after inspection.

[0021] Preferably, the electroformed orifice plate in step 5) is fixed by being adsorbed into the welding hole of corresponding shape by a vacuum fixture.

[0022] Preferably, in the step 5), the electroformed orifice plate and the steel mesh blank are welded together by laser micro-welding, and the weld is less than 50 um.

[0023] Preferably, in the step 6), the steel mesh blank is glued and pasted on the mesh frame, and after curing, a finished steel mesh is obtained, or a movable steel sheet and a movable steel mesh are assembled for supporting use.

[0024] Preferably, step 3) and step 4) are performed in no particular order.

[0025] Preferably, the following steps are further included between step 3) and step 6):

[0026] 5.5) The openings on the steel mesh blank are post-processed by deburring and grinding the hole walls, and the residues therein are removed.

[0027] The beneficial effect of the present invention is that the present invention adopts a composite process to transform the local difficult-to-process area on the steel mesh into an electroformed hole plate by electroforming. Laser micro-welding technology is used to embed into the corresponding opening of the steel mesh blank, so that the local opening is electroformed and most of the openings are laser-processed, thereby combining the advantages of electroforming with laser processing, which not only ensures the precision of the small holes and the requirements of printing demoulding, but also reduces the overall processing cost and improves the processing efficiency. DETAILED DESCRIPTION

[0028] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0029] The present invention provides a local electroforming steel mesh processing process based on micro-welding technology, wherein the steel mesh includes a plurality of first-class openings and second-class openings, which are distinguished according to the area ratio, and the openings greater than 0.5 and less than 0.66 are not suitable for laser cutting and are regarded as first-class openings, and the others are regarded as second-class openings. The steel mesh is a mesh structure composed of a plurality of first-class openings and second-class openings.

[0030] The present invention comprises the following steps:

[0031] 1) According to the design drawing of the steel mesh, a type of opening is divided into several areas and separately made into several electroformed orifice plates, each of which includes several type of openings. When dividing a type of opening into areas, regular geometric shapes such as rectangles can be used as much as possible, if the shape is easy to cut and weld, or the shape of the electroformed orifice plate is made as consistent as possible for easy processing;

[0032] 2) According to the design drawing of the steel mesh, cut the steel plate of the designed size from the stainless steel substrate as the steel mesh blank;

[0033] 3) Laser cutting two types of openings on the steel mesh blank. This step can also be completed after step 4) or 5);

[0034] 4) Laser cutting a number of welding holes corresponding to the size of the electroformed orifice plate on the steel mesh blank;

[0035] 5) The electroformed orifice plate is placed in a welding hole of a corresponding shape and fixed, and the electroformed orifice plate and the steel mesh blank are welded into one by micro welding;

[0036] 6) Gluing the steel mesh blank to the mesh frame, and then baking to obtain the finished steel mesh.

[0037] The processing of the electroformed orifice plate in the above step 1) can also be synchronized with or after the processing of the steel mesh blank; the electroformed orifice plate is a nickel sheet, and a type of opening is processed by an electroforming process.

[0038] The electroforming process includes the following steps:

[0039] 2.1) Prepare a substrate, cut a stainless steel sheet as the substrate;

[0040] 2.2) Pasting the photosensitive film: Paste the photosensitive film on the substrate;

[0041] 2.3) Exposure imaging: using an exposure machine or LDI to expose on the photosensitive film to form an image of the electroformed orifice plate;

[0042] 2.4) Development: The photosensitive film other than the openings to be electroformed is dissolved by development to form a negative opening pattern;

[0043] 2.5) Electroforming: immersing the substrate in an electroforming tank to form a nickel alloy sheet on the substrate by electroforming;

[0044] 2.6) Finished product: the nickel alloy sheet is peeled off from the substrate and the electroformed orifice plate is obtained after stretching the mesh.

[0045] The electroforming process of the present invention is a 3D additive manufacturing process. The processed hole wall is particularly smooth, with a roughness of less than 0.2um. The limit area ratio of printing demoulding can be reduced from 0.66 to 0.5. Under the same conditions, better printing quality can be obtained than laser processing. Actual work experience shows that the electroformed hole plate processed by the above electroforming process has a good demoulding effect and improves the SMT printing quality.

[0046] Furthermore, the electroformed orifice plate in step 5) is fixed by being adsorbed in a welding hole of a corresponding shape by a vacuum fixture.

[0047] Furthermore, in step 5), the electroformed orifice plate and the steel mesh blank are welded together by laser micro-welding, with a minimum weldable material thickness of 0.05 mm and a weld seam of less than 50 um.

[0048] Furthermore, in step 6), the steel mesh blank is glued and pasted on the mesh frame, and the finished steel mesh is obtained after curing.

[0049] Furthermore, the following steps are included between step 3) and step 6):

[0050] 5.5) The holes on the steel mesh blank are deburred, the hole walls are ground, and the residue is removed. This step can improve the quality of the product appearance.

[0051] Through the above process, local openings are made using electroforming, while most openings are made using laser cutting technology, thereby combining the advantages of electroforming with laser processing, which not only ensures the printing and demolding requirements of small holes, but also reduces the overall processing cost and improves the processing efficiency.

[0052] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A steel mesh processing process based on micro-welding technology, the steel mesh includes a plurality of first-class openings and second-class openings, characterized in that: Class I openings and Class II openings are distinguished based on the area ratio. Openings greater than 0.5 and less than 0.66 are not suitable for laser cutting and are considered Class I openings. Others are considered Class II openings. The steel mesh is a mesh structure composed of several Class I openings and Class II openings, which includes the following steps: 1) According to the design drawing of the steel mesh, the one type of openings is divided into regions and individually made into a plurality of electroformed orifice plates, each of which includes a plurality of the one type of openings; when dividing the one type of openings into regions, regular geometric figures are used; 2) According to the design drawing of the steel mesh, a steel plate of designed size is cut from the stainless steel substrate as a steel mesh blank; 3) Laser cutting the two types of openings on the steel mesh blank; this step can also be completed after step 4) or 5); 4) laser cutting a plurality of welding holes of a size corresponding to the electroformed orifice plate on the steel mesh blank; 5) placing the electroformed orifice plate in the welding hole of corresponding shape and fixing it, and welding the electroformed orifice plate and the steel mesh blank into one by micro welding; 6) Gluing the steel mesh blank to the mesh frame, and then baking to obtain the finished steel mesh; The area ratio of the first type of openings is greater than 0.5 and less than 0.66; the area ratio of the second type of openings is greater than 0.66; The electroformed orifice plate is a nickel sheet, and the first type of openings are formed by electroforming; the area ratio of the first type of openings is greater than 0.5 and less than 0.66; The electroformed orifice plate in step 5) is fixed by being adsorbed in the welding hole of corresponding shape by a vacuum fixture; In the step 5), the electroformed orifice plate and the steel mesh blank are welded together by laser micro-welding, and the weld is less than 50 um; In the step 6), the steel mesh blank is glued and pasted on the mesh frame, and after curing, a finished steel mesh is obtained, or a movable steel sheet and a movable steel mesh are assembled for matching use; The step 3) and the step 4) are not in any particular order; The following steps are also included between step 3) and step 6): The openings on the steel mesh blank are post-processed by deburring and grinding the hole walls, and the residues therein are removed.

2. The steel mesh processing technology based on micro welding technology according to claim 1 is characterized in that the electroforming process comprises the following steps: 2.1) Prepare the substrate, using metal such as copper plate or stainless steel plate as the substrate; 2.2) pasting a photosensitive film, pasting a photosensitive film on the substrate; 2.3) Exposure imaging, using an exposure machine or LDI to expose on the photosensitive film to form an image of the electroformed orifice plate; 2.4) Development: dissolving the photosensitive film other than the openings to be electroformed by development to form a negative opening pattern; 2.5) Electroforming: immersing the substrate in an electroforming tank, and atomically depositing a nickel alloy sheet on the substrate through process parameters such as current and temperature; 2.6) Finished product: the nickel alloy sheet is peeled off from the substrate and the electroformed orifice plate is obtained after inspection.