CN115767938B - Gold selection and plating method applied to reinforced steel sheet - Google Patents
Gold selection and plating method applied to reinforced steel sheet Download PDFInfo
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- CN115767938B CN115767938B CN202211496194.XA CN202211496194A CN115767938B CN 115767938 B CN115767938 B CN 115767938B CN 202211496194 A CN202211496194 A CN 202211496194A CN 115767938 B CN115767938 B CN 115767938B
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- steel sheet
- reinforced steel
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- exposure
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 141
- 239000010959 steel Substances 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 85
- 238000007747 plating Methods 0.000 title claims abstract description 66
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000010931 gold Substances 0.000 title claims abstract description 31
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 31
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 33
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 27
- 238000005530 etching Methods 0.000 claims abstract description 11
- 238000009713 electroplating Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 238000007731 hot pressing Methods 0.000 claims description 25
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a gold-plating method applied to reinforced steel sheets, which comprises the following steps: the substrate provides: selecting a reinforced steel sheet without any coating on the surface; designing a graph; nickel plating: when the reinforced steel sheet is conveyed to a nickel plating process, carrying out full nickel plating on the reinforced steel sheet; pasting a dry film, exposing with a film, then developing, etching and removing the film to obtain the preset shape of the reinforced steel sheet; continuing to paste a dry film, and then exposing and developing to ensure that the dry film is only reserved on the non-working part of the reinforced steel sheet; gold plating: continuously electroplating 790-810s on the reinforced steel sheet at 82-86 ℃ to cover the working part of the reinforced steel sheet with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts distributed in an array manner and edge parts, and one end of each body part extends to each edge part; removing the film: the dry film at the non-working portion of the reinforcing steel sheet is removed. The invention at least comprises the following advantages: the grounding resistance is stable and small, and the welding performance is optimized.
Description
Technical Field
The invention relates to the technical field of circuit boards, in particular to a gold-plating selection method applied to reinforced steel sheets.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The circuit board is in most cases in the use, need the cooperation reinforcement steel sheet to use. The conventional reinforced steel sheet is fixed with the circuit board by soldering through a nickel layer on the surface of the reinforced steel sheet. However, due to the influences of materials, operation methods and the like, the welding difficulty is high, and the welding joint of the two parts is irregular, so that the grounding resistance of the reinforced steel sheet after being pressed with the circuit board cannot reach the required value (not more than 0.4Ω), and the reliability is poor.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides a gold-selecting and plating method applied to a reinforced steel sheet, and solves the problems of high grounding resistance and poor reliability in the prior art.
The embodiment of the application discloses: a gold-selecting and plating method applied to a reinforced steel sheet comprises the following steps:
The substrate provides: selecting a reinforced steel sheet without any coating on the surface;
designing a graph: the method comprises the steps of optically drawing a preset pattern designed by software into a top film and a bottom film through an optical drawing machine;
Nickel plating: when the reinforced steel sheet is conveyed to a nickel plating process, carrying out full nickel plating on the reinforced steel sheet;
Pasting a dry film, exposing with a film, then developing, etching and removing the film, and specifically comprises the following steps: pasting a dry film on the surface of the reinforced steel sheet after nickel plating in a hot pressing mode; then arranging the reinforced steel sheet between two films, and transferring the patterns of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing procedure at a speed of 2.3-2.7m/min so that a pattern is developed on the reinforced steel sheet; etching the developed reinforced steel sheet through liquid medicine to obtain the preset shape of the reinforced steel sheet; carrying out surface film removing treatment on the reinforced steel sheet with the preset shape;
the method comprises the steps of dry film pasting, exposure and development, and specifically comprises the following steps: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; then, the dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
Gold plating: the reinforced steel sheet with the preset shape is conveyed to an electroplating process through an exposure and development process, and the reinforced steel sheet is subjected to continuous electroplating 790-810s at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts and edge parts which are distributed in an array, the rest is a non-working part of the reinforced steel sheet, and one end of the body part extends to the edge parts;
Removing the film: and the reinforced steel sheet after the gold plating process is transmitted to a film removing process at a constant speed so as to remove the dry film at the non-working part of the reinforced steel sheet.
Further, in the step of "full-face nickel plating of the reinforcing steel sheet when the reinforcing steel sheet is conveyed to the nickel plating process", full-face nickel plating of the reinforcing steel sheet is performed at a temperature of 81-85 ℃ for 1950-2050 s.
Further, in the step of "pasting a dry film on the surface of the reinforced steel sheet after nickel plating by hot pressing", the reinforced steel sheet is hot-pressed and transferred at a speed of 2.3-2.7m/min, and the temperature parameter in the hot pressing process is 85-110 ℃ and the pressure is 4.5-5.5kg/cm 2, so as to paste the dry film on the surface of the reinforced steel sheet.
Further, in the step of "then disposing the reinforcing steel sheet between two films, transferring the pattern exposure of the two films onto the dry film by exposure", the exposure parameters of the reinforcing steel sheet: the precision is 11-13 mu m, the PE value is 38-42, and the exposure rule number is 8-10.
Further, in the step of "the working portion of the reinforcing steel sheet includes a plurality of body portions distributed in an array, and edge portions, and the rest is the non-working portion of the reinforcing steel sheet", two adjacent body portions are connected by connecting ribs.
Further, the reinforcement steel sheet after the gold plating and film removing processes is glued, wherein the first surface of the reinforcement steel sheet is provided with a gold plating layer, the second surface of the reinforcement steel sheet is coated with conductive adhesive in a hot pressing mode, and the first surface and the second surface of the reinforcement steel sheet are oppositely arranged.
Further, in the step of pasting a dry film, then exposing and developing, the method specifically comprises the following steps: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; then, the dry film is only remained in the non-working part of the reinforced steel sheet through the procedures of exposure and development,
The reinforced steel sheet is conveyed by hot pressing at the speed of 0.8-1.0m/min, the temperature parameter in the hot pressing process is 90-100 ℃, and the pressure is 5.0-5.2kg/cm 2, so that a dry film is attached to the non-working surface of the reinforced steel sheet;
The hot-pressed reinforced steel sheet is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 mu m, the PE value is 20-30, and the exposure rule number is 6-8;
The exposed reinforcing steel sheet is conveyed to a developing process at a speed of 2.6-3.0m/min, and development is completed so that a dry film remains only in the non-working portion of the reinforcing steel sheet.
By the technical scheme, the invention has the following beneficial effects: firstly, selecting a reinforced steel plate with proper size parameters and clean surface, obtaining the reinforced steel plate with a preset shape through the procedures of designing a pattern, plating nickel, pasting a dry film, exposing by using a film, developing, etching, removing the film and the like, and enabling the dry film to be only reserved on a non-working part of the reinforced steel plate through the procedures of pasting the dry film, exposing, developing and the like; the method comprises the steps of carrying out gold plating treatment on a reinforced steel plate, wherein in the process, the working part of the reinforced steel plate is electroplated with a gold plating layer by controlling parameters such as temperature, time and the like, and the working part comprises a plurality of body parts distributed in an array and edge parts; the selective gold-plated reinforced steel plate obtained by adopting the structure and the working procedure can ensure that the tin only climbs on the gold-plated layer and does not spread to a non-working area in the subsequent tin-plating connection process of the reinforced steel plate and the circuit board, namely the body part and the edge part of the whole reinforced steel plate can be effectively, uniformly and regularly connected with the circuit board, thereby ensuring that the grounding resistance is small (namely not more than 0.15 omega) and the resistance is stable.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method in an embodiment of the invention;
Fig. 2 is a schematic structural view of a reinforcing steel sheet in an embodiment of the present invention.
Reference numerals of the above drawings: 1. a reinforcing steel plate; 2. a body portion; 3. edge portions.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 1 and 2, this embodiment discloses a gold-selective plating method applied to a reinforced steel sheet, comprising the following steps:
The substrate provides: selecting a reinforced steel sheet without any coating on the surface;
designing a graph: the method comprises the steps of optically drawing a preset pattern designed by software into a top film and a bottom film through an optical drawing machine;
Nickel plating: when the reinforced steel sheet is conveyed to a nickel plating process, carrying out full nickel plating on the reinforced steel sheet;
Pasting a dry film, exposing with a film, then developing, etching and removing the film, and specifically comprises the following steps: pasting a dry film on the surface of the reinforced steel sheet after nickel plating in a hot pressing mode; then arranging the reinforced steel sheet between two films, and transferring the patterns of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing procedure at a speed of 2.3-2.7m/min so that a pattern is developed on the reinforced steel sheet; etching the developed reinforced steel sheet through liquid medicine to obtain the preset shape of the reinforced steel sheet; carrying out surface film removing treatment on the reinforced steel sheet with the preset shape;
the method comprises the steps of dry film pasting, exposure and development, and specifically comprises the following steps: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; then, the dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
Gold plating: the reinforced steel sheet with the preset shape is conveyed to an electroplating process through an exposure and development process, and the reinforced steel sheet is subjected to continuous electroplating 790-810s at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts 2 distributed in an array manner and edge parts 3, the rest is a non-working part of the reinforced steel sheet, and one end of the body part 2 extends to the edge parts 3;
Removing the film: and the reinforced steel sheet after the gold plating process is transmitted to a film removing process at a constant speed so as to remove the dry film at the non-working part of the reinforced steel sheet.
By the method, firstly, a reinforced steel plate 1 with proper size parameters and clean surface is selected, after the procedures of designing graphics, plating nickel, pasting dry films, exposing by using films, developing, etching, removing films and the like, the reinforced steel plate 1 with a preset shape can be obtained, and then, the dry films are only reserved on the non-working part of the reinforced steel plate through the procedures of pasting dry films, exposing, developing and the like; the reinforcement steel plate 1 is subjected to gold plating treatment, and in the process, the working part of the reinforcement steel plate 1 can be electroplated with gold plating through controlling parameters such as temperature, time and the like, wherein the working part comprises a plurality of body parts 2 distributed in an array and edge parts 3; the selectively gold-plated reinforced steel plate 1 obtained by adopting the structure and the working procedure can only creep on a gold-plated layer and can not be diffused to a non-working area in the subsequent tin plating connection process of the reinforced steel plate 1 with a circuit board, namely, the body part 2 and the edge part 3 of the whole reinforced steel plate 1 can be effectively, uniformly and regularly connected with the circuit board, thereby ensuring that the grounding resistance is small (namely, not more than 0.15 ohm) and the resistance is stable.
One embodiment includes:
the substrate provides: selecting a reinforced steel sheet without any coating on the surface, wherein the size of the reinforced steel sheet is 250mm or 350mm;
Designing a graph: and (3) optically drawing a preset pattern designed by software into a top film and a bottom film through an optical drawing machine.
Nickel plating: and when the reinforced steel sheet is conveyed to a nickel plating process, carrying out full nickel plating on the reinforced steel sheet at the temperature of 81-85 ℃ for 1950-2050 s.
Pasting a dry film, exposing with a film, then developing, etching and removing the film, and specifically comprises the following steps: and pasting a dry film on the surface of the reinforced steel sheet after nickel plating in a hot pressing mode, specifically, carrying out hot pressing conveying on the reinforced steel sheet at a speed of 2.3-2.7m/min, wherein the temperature parameter in the hot pressing process is 85-110 ℃, and the pressure is 4.5-5.5kg/cm < 2>, so as to paste the dry film on the surface of the reinforced steel sheet.
Then, the reinforced steel sheet is arranged between two films, and the patterns of the two films are transferred onto a dry film through exposure, wherein the exposure parameters of the reinforced steel sheet are as follows: the precision is 11-13 mu m, the PE value is 38-42, and the exposure rule number is 8-10.
Then the reinforced steel sheet passes through a developing procedure at a speed of 2.3-2.7m/min so that a pattern is developed on the reinforced steel sheet; etching the developed reinforced steel sheet through liquid medicine to obtain the preset shape of the reinforced steel sheet; and carrying out surface film removing treatment on the reinforced steel sheet with the preset shape.
The method comprises the steps of dry film pasting, exposure and development, and specifically comprises the following steps: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; and then, the dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development.
Specifically, the reinforced steel sheet is conveyed by hot pressing at a speed of 0.8-1.0m/min, wherein the temperature parameter in the hot pressing process is 90-100 ℃, and the pressure is 5.0-5.2kg/cm < 2 >, so that a dry film is adhered to the non-working surface of the reinforced steel sheet;
The hot-pressed reinforced steel sheet is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 mu m, the PE value is 20-30, and the exposure rule number is 6-8;
The exposed reinforcing steel sheet is conveyed to a developing process at a speed of 2.6-3.0m/min, and development is completed so that a dry film remains only in the non-working portion of the reinforcing steel sheet.
Gold plating: the reinforced steel sheet with the preset shape is conveyed to an electroplating process through an exposure and development process, and the reinforced steel sheet is subjected to continuous electroplating 790-810s at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforcing steel sheet comprises a plurality of body parts 2 and edge parts 3 which are distributed in an array, the rest is a non-working part of the reinforcing steel sheet, and one end of the body part 2 extends to the edge parts 3. Preferably, two adjacent body parts 2 are connected by a connecting rib.
Noteworthy here is that: the body portion 2 is rectangular and distributed in a rectangular array, and the number and the gaps thereof can be adaptively designed according to requirements, which will not be described here. It is also worth noting that this edge portion 3 refers to the edge of each ridge line of the reinforcing steel plate 1 and the side wall of the reinforcing steel plate 1, and is positioned as the above-mentioned edge portion 3 because the overall thickness of the reinforcing steel plate 1 is small.
Removing the film: and the reinforced steel sheet after the gold plating process is transmitted to a film removing process at a constant speed so as to remove the dry film at the non-working part of the reinforced steel sheet.
And (3) gluing the reinforced steel sheet after the gold plating and film removing processes, wherein the first surface of the reinforced steel sheet is provided with a gold plating layer, the second surface of the reinforced steel sheet is coated with conductive adhesive in a hot pressing mode, and the first surface and the second surface of the reinforced steel sheet are oppositely arranged.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. The gold-selecting and plating method applied to the reinforced steel sheet is characterized by comprising the following steps of:
The substrate provides: selecting a reinforced steel sheet without any coating on the surface;
designing a graph: the method comprises the steps of optically drawing a preset pattern designed by software into a top film and a bottom film through an optical drawing machine;
Nickel plating: when the reinforced steel sheet is conveyed to a nickel plating process, carrying out full nickel plating on the reinforced steel sheet; carrying out full nickel plating on the reinforced steel sheet at the temperature of 81-85 ℃ for 1950-2050 s;
Pasting a dry film, exposing with a film, then developing, etching and removing the film, and specifically comprises the following steps: pasting a dry film on the surface of the reinforced steel sheet after nickel plating in a hot pressing mode, wherein the reinforced steel sheet is conveyed in a hot pressing mode at a speed of 2.3-2.7m/min, and the temperature parameter in the hot pressing process is 85-110 ℃ and the pressure is 4.5-5.5kg/cm < 2 >, so that the dry film is pasted on the surface of the reinforced steel sheet; then arranging the reinforced steel sheet between two films, and transferring the patterns of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing procedure at a speed of 2.3-2.7m/min so that a pattern is developed on the reinforced steel sheet; etching the developed reinforced steel sheet through liquid medicine to obtain the preset shape of the reinforced steel sheet; carrying out surface film removing treatment on the reinforced steel sheet with the preset shape;
the method comprises the steps of dry film pasting, exposure and development, and specifically comprises the following steps: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; then, the dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
Gold plating: the reinforced steel sheet with the preset shape is conveyed to an electroplating process through an exposure and development process, and the reinforced steel sheet is subjected to continuous electroplating 790-810s at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts and edge parts which are distributed in an array, the rest is a non-working part of the reinforced steel sheet, and one end of the body part extends to the edge parts;
removing the film: the reinforced steel sheet after the gold plating process is transmitted to a film removing process at a constant speed so as to remove a dry film at a non-working part of the reinforced steel sheet;
The reinforcement steel sheet is connected with the circuit board in a tin plating mode, and tin climbs on the gold plating layer in the tin plating connection process and cannot diffuse to the non-working portion.
2. The gold-selective plating method for a reinforcing steel sheet according to claim 1, wherein in the step of "then disposing the reinforcing steel sheet between two films, transferring the pattern exposure of the two films onto a dry film by exposure", the exposure parameters of the reinforcing steel sheet: the precision is 11-13 mu m, the PE value is 38-42, and the exposure rule number is 8-10.
3. The method according to claim 1, wherein in the step of forming the working portion of the reinforced steel sheet to include a plurality of body portions distributed in an array, and an edge portion, and the rest is a non-working portion of the reinforced steel sheet, two adjacent body portions are connected by a connecting rib.
4. The method for selectively plating gold on a reinforced steel sheet according to claim 1, wherein the reinforced steel sheet after the gold plating and film removing processes is glued, wherein the first surface of the reinforced steel sheet is provided with a gold plating layer, the second surface of the reinforced steel sheet is coated with conductive adhesive in a hot pressing manner, and the first surface and the second surface of the reinforced steel sheet are arranged opposite to each other.
5. The method for selectively plating gold for reinforcing steel sheets according to claim 1, wherein the steps of "dry film pasting, then exposure and development" specifically include: pasting a dry film on the reinforced steel sheet with the preset shape in a hot pressing mode; then, the dry film is only remained in the non-working part of the reinforced steel sheet through the procedures of exposure and development,
The reinforced steel sheet is conveyed by hot pressing at the speed of 0.8-1.0m/min, the temperature parameter in the hot pressing process is 90-100 ℃, and the pressure is 5.0-5.2kg/cm 2, so that a dry film is attached to the non-working part of the reinforced steel sheet;
The hot-pressed reinforced steel sheet is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 mu m, the PE value is 20-30, and the exposure rule number is 6-8;
The exposed reinforcing steel sheet is conveyed to a developing process at a speed of 2.6-3.0m/min, and development is completed so that a dry film remains only in the non-working portion of the reinforcing steel sheet.
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| CN202211496194.XA CN115767938B (en) | 2022-11-25 | 2022-11-25 | Gold selection and plating method applied to reinforced steel sheet |
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| CN202211496194.XA CN115767938B (en) | 2022-11-25 | 2022-11-25 | Gold selection and plating method applied to reinforced steel sheet |
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| CN115767938B true CN115767938B (en) | 2024-05-28 |
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| Publication number | Publication date |
|---|---|
| CN115767938A (en) | 2023-03-07 |
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