CN111146030A - Manufacturing method of novel side key product - Google Patents
Manufacturing method of novel side key product Download PDFInfo
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- CN111146030A CN111146030A CN202010029271.5A CN202010029271A CN111146030A CN 111146030 A CN111146030 A CN 111146030A CN 202010029271 A CN202010029271 A CN 202010029271A CN 111146030 A CN111146030 A CN 111146030A
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- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
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Abstract
The invention discloses a manufacturing method of a novel side key product, which comprises the steps of manufacturing an FPC hollow board, and printing silver paste, conductive carbon oil and protective printing ink printed on the silver paste and the carbon oil on a bonding pad surface of the FPC hollow board; attaching thermosetting adhesive to the FPC hollow board, and fixing a jig on the tabletop of the attaching board by using a jig special for positioning round head nails; punching; punching the FPC blank plate with the conductive ink surface of the PFC blank plate facing downwards; customizing a suction head attached by an automatic reinforcing machine according to the size of the steel sheet, and attaching the steel sheet to the FPC blank plate by adopting the automatic reinforcing machine to obtain the FPC assembled with the attached steel sheet; turning over one side of the FPC along with the reverse fold line, so that the FPC wraps the steel sheet up and down; placing the FPC reinforced by the adhered steel sheet on a four-opening pressing machine for pressing, and following preset processing conditions; after the steel sheets are pressed, baking the steel sheets by using a cabinet type baking oven, and padding a release film under the product during baking; and (4) after the solidification is finished, transferring according to an engineering design flow, finally, checking the appearance of a finished product FQC/FQA, and packaging and shipping.
Description
Technical Field
The invention relates to the technical field of flexible circuit board manufacturing, in particular to a manufacturing method of a novel side key product.
Background
In the prior art, signal transmission is carried out through the DOM piece mode of pressing to side key class product, and traditional side key class product need be seted up the side keyway on the casing, and the keyway comprises outer section groove (part contains middle section groove) and interior section groove, and there is the gap in unsmooth and the keyway of casing, can't reach waterproof function.
In the current consumer market, can not destroy cell-phone frame structure to side key FPC requirement, can directly attach on the frame, through touching the frame to pressure sensing's mode turns into distinguishable voltage signal with small frame deformation, and rethread system gathers, handles, alright discernment user's touch operation. The product shell is integrally formed, and a groove is not needed, so that the waterproof effect can be achieved.
Therefore, the FPC is special in structure, conductive carbon oil, silver paste and the like are needed to be used as media for signal transmission, a plurality of equidistant small steel sheets need to be attached to the FPC, the steel sheets need to be folded and pressed after being attached, and the requirements for product flatness and voltage stability cannot be met by adopting a conventional steel sheet attaching/pressing mode. In response to the above-mentioned needs and deficiencies of current manufacturing processes, there is an urgent need in the art for improvements.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Based on the reasons, the applicant proposes a manufacturing method of a novel side key product.
Disclosure of Invention
In order to meet the requirements, the invention aims to provide a manufacturing method of a novel side key product.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of a novel side key product comprises the following steps:
manufacturing an FPC hollow board according to a conventional FPC manufacturing flow, and printing silver paste for conduction, conductive carbon oil for stabilizing resistance and protective printing ink printed on the silver paste and the conductive carbon oil on a bonding pad surface of the FPC hollow board to realize the printing of the conductive printing ink on the FPC hollow board;
attaching thermosetting adhesive to the FPC hollow board, and fixing a jig on the tabletop of the attaching board by using a jig special for positioning round head nails;
punching the FPC blank board;
punching the FPC blank plate with the conductive ink surface of the PFC blank plate facing downwards;
customizing a suction head attached by an automatic reinforcing machine according to the size of the steel sheet, and attaching the steel sheet to the FPC blank plate by adopting the automatic reinforcing machine to obtain the FPC assembled with the attached steel sheet;
turning over one side of the FPC along with the reverse fold line, so that the FPC wraps the steel sheet up and down;
placing the FPC reinforced by the adhered steel sheet on a four-opening pressing machine for pressing, and following preset processing conditions;
after the steel sheets are pressed, a cabinet type oven is adopted for baking, and a release film is padded under a product during baking;
and (4) after the solidification is finished, transferring according to an engineering design flow, finally, checking the appearance of a finished product FQC/FQA, and packaging and shipping.
In a possible embodiment, the step of obtaining the FPC assembled with the steel lamination further includes, after the step of obtaining the FPC assembled with the steel lamination, performing a lamination structure design on the FPC blank, where the lamination layer design includes sequentially connecting the FPC to a steel lamination reinforcement, a thermosetting adhesive, a coverlay, a double-sided board, and a coverlay.
In one possible embodiment, the step of obtaining the FPC on which the steel sheet is assembled further comprises a steel sheet flatness inspection method, and the steel sheet flatness inspection method comprises:
cutting the LLW sensing paper into a size equal to that of the FPC empty board, placing the LLW sensing paper on a table board, placing the FPC empty board to be pasted with the steel sheets on the sensing paper, sequentially pasting the steel sheets, and confirming the flatness of the table board and adjusting the pressure of the pasting head by confirming the color difference of all pasted steel sheets transferred to the sensing paper;
in a possible embodiment, the step of turning over one side of the FPC along with the reverse folding line further includes using a special reverse folding device to place the FPC on a reverse folding table top, reversely folding the FPC along the reverse folding line of the FPC product by a reverse folding sheet of the reverse folding device, embedding a positioning hole in the reversely folded FPC into the hole of the jig, and applying pressure to the FPC to ensure that the thermosetting adhesive on the FPC is adhered to the steel sheet without falling off.
In one possible embodiment, the step of turning over one side of the FPC along the reverse fold line further includes:
softening the reverse folding line position of the FPC empty board, and removing the copper foil and cov at the reverse folding line position, so that the FPC empty board can be conveniently reversely folded and flattened;
and detecting the flatness of the reversely folded table top to confirm the flatness of the table top.
In one possible embodiment, the step of turning over one side of the FPC along the reverse folding line further includes a reverse folding flatness inspection method, and the reverse folding flatness inspection method includes:
the LLW sensing paper is cut into a size equal to the size of the reverse folding area and placed on the table board, the reverse folding area of the FPC empty board is placed on the sensing paper, and the flatness of the table board are confirmed and adjusted by confirming the color difference on the sensing paper.
In a possible embodiment, the step of putting the FPC reinforced by the attached steel sheet on a four-opening pressing machine for pressing further comprises a pressing jig designing step, and the pressing jig designing step comprises:
the jig structure is sequentially provided with a first bearing piece, a second bearing piece, silica gel and a base plate which are arranged in parallel from top to bottom;
the width of the first bearing piece and the width of the second bearing piece are 80-120mm, the length of the first bearing piece and the length of the second bearing piece are consistent with the width of a table board of a pressing machine, the first bearing piece and the second bearing piece are made of hard heat-resistant pressure-resistant materials, and the first bearing piece and the second bearing piece are fixedly placed at two ends of the silica gel when being pressed;
the thickness of the silica gel is 0.6-0.8mm, and the silica gel is used for shaping.
The size of the backing plate is consistent with the table board of a pressing machine, the thickness of the backing plate is 1.0-1.5mm, and the backing plate is used for sharing the pressure on the FPC product and the bearing piece.
In a possible embodiment, the step of customizing the suction head attached by the automatic reinforcing machine according to the size of the steel sheet further comprises a special suction head design process, and the special suction nozzle design process comprises the following steps:
the suction head is customized according to the size of the steel sheet, the size of the head attaching position of the suction head is 0.02mm larger than that of the steel sheet on one side, 2 suction holes with the diameter of 1.0-1.2mm are additionally arranged on the suction head, and the suction holes are linearly arranged.
In one possible embodiment, the processing conditions include:
condition 1, steel sheet pressing process: the temperature is 155-165 ℃, and the pressure is 10-15kg/cm2The time is 200-300S;
condition 2, the tool integrated configuration of steel sheet suppression does from the bottom to the bottom in proper order: FR4 backing plate, green silica gel, FPC left and right bearing sheets, common release film, FPC, common release film and green silica gel;
in condition 3, the thickness of FR4 is required to be 1.0-1.5mm, the thickness of the common release film is 25-35 μm, the thickness of the bearing sheet is required to be less than FPC10-30 μm, and the thickness of the green silica gel is 0.5-0.8 mm.
In a possible embodiment, the step of baking the steel sheets by using a cabinet oven after the steel sheets are laminated further comprises: the baking parameter requirement is as follows: baking temperature: 160 +/-5 ℃; baking time: 60-90 min.
Compared with the prior art, the invention has the beneficial effects that: the manufacturing method of the novel side key product can realize the pressing and manufacturing of the side key type pressure sensing product, and the side key type product manufactured by the method has high reliability and good performance optimization, and specifically comprises the following steps:
in the pressing process, a special suction nozzle is used for attaching, so that the problems of inclination of material suction of thick and narrow steel sheets and inconsistent attaching intervals of the steel sheets can be effectively prevented;
the special pressing jig effectively shares the pressure on the product and the bearing sheet, and the problem that the consumable material of the pressing machine is damaged by pressing for a long time is solved;
the conductive carbon oil printed on the FPC blank board has stable resistance, and the conductive carbon oil containing the ink is printed on the silver paste and the conductive carbon oil to play a role in protection;
the conductive ink surface faces downwards in the punching process, so that the problem of ink tearing is solved;
the reverse folding sheet reversely folds the FPC along the reverse folding line, just embeds the positioning hole on the reversely folded FPC into the jig hole, and applies a certain pressure on the FPC to ensure that the glue on the FPC is not easy to fall off after being primarily bonded with the steel sheet;
the problem of control over the fitting precision of a plurality of equidistant tiny steel sheets fitted on a side-key FPC single PCS product is solved;
the problem of FPC sinking at the gap between the steel sheets when the side key FPC is pressed is prevented.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a method for manufacturing a novel side key product according to the present invention;
FIG. 2 is a schematic structural diagram of a product in a reverse-folding region according to a second embodiment of the method for manufacturing a novel side key product of the present invention;
FIG. 3 is a schematic view of a manufacturing process of flatness of the reverse-folded region according to a second embodiment of the method for manufacturing a novel side key product of the present invention;
FIG. 4 is a schematic structural diagram of a FPC product after planarization manufacture according to a second embodiment of the method for manufacturing a novel side key product of the present invention;
FIG. 5 is a schematic view of a second embodiment of the method for manufacturing a novel side key product according to the present invention;
FIG. 6 is a schematic view of a product pressed depression of a second embodiment of the method for manufacturing a novel side key product of the present invention;
fig. 7 is a schematic structural view of a special pressing fixture in a second embodiment of the method for manufacturing a novel side key product of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Example one
As shown in fig. 1, a schematic flow chart of a first embodiment of the method for manufacturing a novel side key product of the present invention includes the following steps:
step S1, manufacturing an FPC (flexible printed circuit) hollow board according to a conventional FPC manufacturing flow, and printing silver paste for conducting, conductive carbon oil for stabilizing resistance and protective printing ink printed on the silver paste and the conductive carbon oil on the bonding pad surface of the FPC hollow board to realize the printing of the conductive printing ink on the FPC hollow board;
step S2, adhering thermosetting adhesive to the FPC blank board, and fixing a jig on the tabletop of the adhering board by using a jig special for positioning round head nails;
step S3, punching the FPC blank board;
step S4, punching the FPC blank board with the conductive ink surface of the PFC blank board facing downwards;
s5, customizing a suction head attached by an automatic reinforcing machine according to the size of the steel sheet, and attaching the FPC blank plate to the steel sheet by adopting the automatic reinforcing machine to obtain the FPC assembled with the attached steel sheet;
step S6, turning over one side of the FPC along with the reverse fold line, and enabling the FPC to wrap the steel sheet up and down;
s7, placing the FPC reinforced by the adhered steel sheet on a four-opening pressing machine for pressing, and following preset processing conditions;
step S8, baking the steel sheets by using a cabinet type oven after the steel sheets are laminated, and padding a release film under the product during baking;
and step S9, after the solidification is finished, circulation is carried out according to the engineering design flow, and finally, finished products FQC/FQA are subjected to appearance inspection and packaged for shipment.
The engineering design process comprises laser engraving and molding after solidification.
Example two
A method for manufacturing a flexible plate of a side key product mainly comprises a laminated structure design, a jig design, a flatness control and a side key flexible plate manufacturing method.
The design of the laminated structure comprises that the designed flexible plate is sequentially composed of a steel sheet reinforcement, thermosetting adhesive, a covering film 1, a double-sided plate and a covering film 2.
Specifically, the flexible board (corresponding to the FPC of the one embodiment, each being a component for manufacturing a side key product) is composed of a reverse folding region, a wire connecting region, and a finger region.
In a preferred embodiment, the cover films 1 and 2 have uniform dimensional rules, and both have a PI thickness of 1/2 mils and a paste thickness of 15 μm.
In a preferred embodiment, the steel sheets are reinforced to have a thickness of 0.4-0.6mm and the steel sheets are spaced apart by 0.5-1.0 mm.
In a preferred embodiment, the double-sided board has a PI thickness of 0.8-1.0mil and a copper thickness of 1/3OZ (12 μm).
In a preferred embodiment, the thermosetting adhesive has a thickness of 1mil (25 μm).
The reverse-folding area of the flexible board is an upper and lower strip-shaped circuit layer connected by a small number of circuits in the middle, the steel sheet is attached to the lower circuit layer, and the upper circuit layer is folded to wrap the steel sheet through reverse folding;
as a better implementation mode, the flatness control process needs to be specially controlled in the process of bending the steel sheet and pressing;
in a preferable embodiment, in the steel sheet pasting process, an automatic reinforcing machine is used for pasting the steel sheets, and a special suction nozzle is used for pasting, so that the steel sheets are ensured to bear uniform pressure.
In a preferred embodiment, the steel sheet attaching process uses a brand-new steel sheet flatness inspection method to confirm the flatness of the table top;
specifically, the steel sheet flatness inspection method is that LLW sensing paper is cut into a size equal to that of a plate and placed on a table board, the plate to be attached is placed on the sensing paper, steel sheets are sequentially attached, and the flatness of the table board and the head attaching pressure are confirmed and adjusted by confirming the color difference of all attached steel sheets transferred to the sensing paper.
As a preferred embodiment, the step of reversely folding the steel sheet comprises the steps of softening the position of the reverse folding line of the flexible plate, and removing the copper foil and cov at the position so as to facilitate the reverse folding and flattening of the flexible plate;
the step of reverse folding also comprises the steps of detecting the flatness of the reverse folding table top and confirming the flatness of the table top;
the method for checking the reverse-folding flatness for detecting the flatness of the reverse-folding table top comprises the steps of cutting the LLW sensing paper into a size equal to the reverse-folding area and placing the LLW sensing paper on the table top, placing the reverse-folding area of the flexible board on the sensing paper, and confirming the flatness of the table top and adjusting the flatness of the table top by confirming the color difference on the sensing paper.
In the processing of the flexible plate, pressing treatment is required, specifically, a special pressing jig is used for pressing, pressing pressure is adjusted, and the phenomenon that the gap of the steel sheet is sunken due to overlarge pressure is prevented.
As a preferred embodiment, the design of pressing by the dedicated pressing jig includes the design of a suction nozzle dedicated for attaching the steel sheet (corresponding to the suction head of the first embodiment, which can be understood as the same component) and the design of a pressing jig dedicated for pressing the steel sheet;
as a preferred embodiment, the design of the special suction nozzle comprises that the suction nozzle needs to be customized according to the size of the steel sheet, the size of the head of the suction nozzle is 0.02mm larger than that of the steel sheet on one side, 2 suction holes with the diameter of 1.0-1.2mm are added and are arranged in a straight line, and the suction holes are too large and leak air, and too small and cannot suck the steel sheet.
As a better implementation mode, the special pressing jig is structurally composed of a bearing sheet 1, a bearing sheet 2, silica gel and a base plate which are arranged in parallel from top to bottom in sequence.
Specifically, the bearing sheet 1 and the bearing sheet 2 are respectively disposed at two ends of the silica gel (i.e., green silica gel shown in the figure) in parallel, and the bearing sheet 1 and the bearing sheet 2 are parallel to each other at the height of the upper end of the silica gel.
The bearing sheets 1 and 2 have the width of 80-120mm and the length consistent with the width of the table board of a pressing machine, can be made of hard heat-resistant and pressure-resistant materials such as copper-clad plates and steel bars, and are fixedly placed at two ends of silica gel during pressing;
the thickness of the silica gel is 0.6-0.8 mm. The silica gel is used for adhering, and the selected silica gel cannot be too thin, so that the adhering effect is poor and the binding force of the steel sheet is influenced; the silica gel also cannot be too thick, thereby causing the risk of plate surface depression and glue overflow;
the size of the base plate is consistent with that of the table board of the press, the thickness of the base plate is 1.0-1.5mm, pressure on products and bearing pieces can be effectively shared, and the problem that consumable materials of the press are damaged due to long-time pressing is solved.
The process of the method for manufacturing the flexible board comprises the following steps: the method comprises the steps of manufacturing an FPC blank according to a conventional process, printing combined ink, assembling and pasting adhesive paper, punching, assembling and pasting a steel sheet, reversely folding, pressing, curing, laser etching, finally inspecting, packaging and delivering.
For more clear and clear description of the above processing techniques, the following description is made with reference to the accompanying drawings:
as shown in fig. 2, is a product structure diagram of the reverse folding area
The laminated structure design means that the flexible plate is sequentially composed of a steel sheet reinforcement, thermosetting adhesive, a covering film 1, a double-sided board and a covering film 2;
the thickness of the steel sheet is 0.5mm, the steel sheet consists of 5-10 steel sheets, the width of the steel sheet is 1.8mm, and the gap between the steel sheets is 0.5-1.0mm
The thickness of the thermosetting adhesive is 1mil (25 mu m);
the specification of the double-sided board is that the PI thickness is 0.8mil, the copper thickness is 1/3OZ (12 mu m), and the double-sided board is a non-adhesive base material.
Specifically, as shown in fig. 2, the cover films 1 and 2 have the same specification, i.e., the PI thickness of 1/2mil and the glue thickness of 15 μm.
As shown in fig. 3, the reverse-folding area is located at a position where the steel sheet is attached to the substrate, and the steel sheet is wrapped in the FPC after being bent along the reverse-folding line;
through the processing steps of the flatness manufacturing of fig. 3, the FPC product structure shown in fig. 4 can be obtained;
the manufacturing method of the reverse-folding area is used for improving the problems of plate surface depression, glue overflow and the like during pressing of a pressure-sensitive product, and comprises the steps of adding hard FR4 or a steel plate (shown in figure 4) below the product, adding load-bearing sheets on the left and right of the product, and coating silica gel on the load-bearing sheets. The main principle is that the lower bottom surface is added with hard FR4 or steel plate, so that the product can not be sunken under high-temperature pressurization, and the flatness of the plate surface is ensured; the left and right sides of the product are provided with the bearing pieces which are used for sharing most pressure of the press, ensuring that the pressure on the position of the FPC steel piece is enough to ensure pure glue filling and hardening, meanwhile, the FPC between the steel pieces is suspended, the force is small, and the sinking phenomenon cannot be caused, wherein the thickness of the bearing piece is selected to be important and needs to be 10-30 mu m lower than the thickness of the product; meanwhile, a piece of green silica gel is placed on the upper plate surface, so that the filling effect is achieved, and the steel sheet rubber and the FPC can be filled.
As a preferred embodiment, as shown in fig. 4, during pressing of the pressure-sensitive product, FR4, green silica gel, the left and right FPC bearing sheets, the common release film, the FPC, the common release film, and the green silica gel are sequentially placed on the table top of the press from bottom to top according to the above-mentioned plate placing structure, and then press-fitting is started, so that pressing for reinforcing the steel sheet can be realized.
Through the processing steps, the product pressing flattening graph and the product pressing depression graph respectively shown in fig. 5 and fig. 6 are obtained, so that the FPC in the steel sheet gap area after pressing treatment in the scheme can not be depressed, and the surface flatness of the FPC is ensured.
As shown in the schematic structural diagram of fig. 7, the jig structure adopted in this embodiment is, from top to bottom, a bearing sheet 1, a bearing sheet 2, silica gel, and a backing plate in sequence;
as shown in the figure, the width of the bearing sheet 1 and the bearing sheet 2 is 80-120mm, the length of the bearing sheet is consistent with the width of the table board of a pressing machine, the bearing sheets can be made of hard heat-resistant pressure-resistant materials such as copper-clad plates and steel bars, and the bearing sheets are fixedly arranged at two ends of silica gel during pressing;
as shown in the figure, the thickness of the silica gel is 0.6-0.8 mm. The silica gel is used for adhering, and the selected silica gel cannot be too thin, so that the adhering effect is poor and the binding force of the steel sheet is influenced; too thick results in too thick profile, plate surface depression and glue overflow risks;
as shown in the figure, the size of the base plate is consistent with that of the table board of the press, the thickness of the base plate is 1.0-1.5mm, the pressure on products and bearing pieces can be effectively shared, and the problem that the consumable materials of the press are damaged by long-time pressing is solved.
In summary, with reference to the first and second embodiments, the method for manufacturing a side key product of the present invention is suitable for pressing an FPC product to which a plurality of thick steel sheets with gaps are attached and which needs to be folded back. Compared with the traditional pressing method, the method can solve the problem of FPC indentation, ensure the bonding force of steel sheets, ensure the pressing flatness of FPC pressure-sensitive products and ensure that the functions meet the requirements of customers.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. The manufacturing method of the novel side key product is characterized by comprising the following steps:
manufacturing an FPC hollow board according to a conventional FPC manufacturing flow, and printing silver paste for conduction, conductive carbon oil for stabilizing resistance and protective printing ink printed on the silver paste and the conductive carbon oil on a bonding pad surface of the FPC hollow board to realize the printing of the conductive printing ink on the FPC hollow board;
attaching thermosetting adhesive to the FPC hollow board, and fixing a jig on the tabletop of the attaching board by using a jig special for positioning round head nails;
punching the FPC blank board;
punching the FPC blank plate with the conductive ink surface of the PFC blank plate facing downwards;
customizing a suction head attached by an automatic reinforcing machine according to the size of the steel sheet, and attaching the steel sheet to the FPC blank plate by adopting the automatic reinforcing machine to obtain the FPC assembled with the attached steel sheet;
turning over one side of the FPC along with the reverse fold line, so that the FPC wraps the steel sheet up and down;
placing the FPC reinforced by the adhered steel sheet on a four-opening pressing machine for pressing, and following preset processing conditions;
after the steel sheets are pressed, a cabinet type oven is adopted for baking, and a release film is padded under a product during baking;
and (4) after the solidification is finished, transferring according to an engineering design flow, finally, checking the appearance of a finished product FQC/FQA, and packaging and shipping.
2. The method for manufacturing a novel side key product according to claim 1, wherein the step of obtaining the FPC assembled with the steel lamination further comprises a step of designing a lamination structure of the FPC blank, wherein the lamination layer design comprises connecting the FPC with a steel lamination reinforcement, a thermosetting adhesive, a cover film, a double-sided board and a cover film in sequence.
3. The method for manufacturing a novel side key product as claimed in claim 1, wherein the step of obtaining the FPC with the steel lamination assembled thereon further comprises a steel lamination flatness inspection method, and the steel lamination flatness inspection method comprises the following steps:
the LLW sensing paper is cut into the size equal to that of the FPC empty board and placed on the table board, the FPC empty board to be pasted with the steel sheets is placed on the sensing paper, the steel sheets are sequentially pasted, and the flatness of the table board and the pressure of the pasting head are confirmed and adjusted by confirming the color difference of all pasted steel sheets transferred to the sensing paper.
4. The method for manufacturing a novel side key product according to claim 1, wherein the step of turning over one side of the FPC along with the reverse folding line further comprises the steps of placing the FPC on a reverse folding table top by using special reverse folding equipment, reversely folding the FPC along the reverse folding line of the FPC product by using a reverse folding sheet of the reverse folding equipment, embedding a positioning hole in the reversely folded FPC into a jig hole, and applying pressure to the FPC to ensure that the thermosetting adhesive on the FPC is adhered to the steel sheet without falling off.
5. The method for manufacturing a novel side key product as claimed in claim 1, wherein the step of turning over one side of the FPC along with the reverse fold line further comprises:
softening the reverse folding line position of the FPC empty board, and removing the copper foil and cov at the reverse folding line position, so that the FPC empty board can be conveniently reversely folded and flattened;
and detecting the flatness of the reversely folded table top to confirm the flatness of the table top.
6. The method for manufacturing a novel side key product as claimed in claim 1, wherein the step of turning over one side of the FPC along with the reverse folding line further comprises a reverse folding flatness inspection method, the reverse folding flatness inspection method comprising:
the LLW sensing paper is cut into a size equal to the size of the reverse folding area and placed on the table board, the reverse folding area of the FPC empty board is placed on the sensing paper, and the flatness of the table board are confirmed and adjusted by confirming the color difference on the sensing paper.
7. The manufacturing method of the novel side key product as claimed in claim 1, wherein the step of placing the steel sheet adhered reinforced FPC on a four-opening pressing machine for pressing further comprises a pressing tool designing step, and the pressing tool designing step comprises:
the jig structure is sequentially provided with a first bearing piece, a second bearing piece, silica gel and a base plate which are arranged in parallel from top to bottom;
the width of the first bearing piece and the width of the second bearing piece are 80-120mm, the length of the first bearing piece and the length of the second bearing piece are consistent with the width of a table board of a pressing machine, the first bearing piece and the second bearing piece are made of hard heat-resistant pressure-resistant materials, and the first bearing piece and the second bearing piece are fixedly placed at two ends of the silica gel when being pressed;
the thickness of the silica gel is 0.6-0.8mm, and the silica gel is used for shaping;
the size of the backing plate is consistent with the table board of a pressing machine, the thickness of the backing plate is 1.0-1.5mm, and the backing plate is used for sharing the pressure on the FPC product and the bearing piece.
8. The method for manufacturing a novel side key product as claimed in claim 1, wherein the step of customizing the suction head attached by the automatic reinforcing machine according to the size of the steel sheet further comprises a special suction head design process, and the special suction nozzle design process comprises:
the suction head is customized according to the size of the steel sheet, the size of the head attaching position of the suction head is 0.02mm larger than that of the steel sheet on one side, 2 suction holes with the diameter of 1.0-1.2mm are additionally arranged on the suction head, and the suction holes are linearly arranged.
9. The method of claim 1, wherein the processing conditions include:
condition 1, steel sheet pressing process: the temperature is 155-165 ℃, and the pressure is 10-15kg/cm2The time is 200-300S;
condition 2, the tool integrated configuration of steel sheet suppression does from the bottom to the bottom in proper order: FR4 backing plate, green silica gel, FPC left and right bearing sheets, common release film, FPC, common release film and green silica gel;
in condition 3, the thickness of FR4 is required to be 1.0-1.5mm, the thickness of the common release film is 25-35 μm, the thickness of the bearing sheet is required to be less than FPC10-30 μm, and the thickness of the green silica gel is 0.5-0.8 mm.
Condition 4, the direction of the pressing laying plate surface is: the inflected surface is placed upward.
10. The method for manufacturing a novel side key product as claimed in claim 1, wherein the step of baking the steel sheet by using a cabinet type oven after the steel sheet is pressed, further comprises the steps of: the baking parameter requirement is as follows: baking temperature: 160 +/-5 ℃; baking time: 60-90 min.
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