Processing method for supporting steel sheet for foldable mobile phone screen

Abstract

A processing method for a supporting steel sheet for a foldable mobile phone screen, which improves the adhesion stability of an assembly between a small steel sheet (1) and a large steel sheet (3), and removes burrs from the steel sheets. The method comprises the following steps: a) arranging small steel sheets in an array by means of an etching process, and by means of a die cutter, die cutting a hot melt adhesive into hot melt adhesive block semi-finished products arranged in an array; b) aligning and laminating a small steel sheet semi-finished product onto a corresponding hot-melt adhesive block semi-finished product, so as to form a product array of composite semi-finished products comprising a plurality of hot-melt adhesive blocks and small steel sheets; c) removing and setting aside each composite semi-finished product for later use; d) separately processing each large steel sheet by means of an etching process; e) positioning the large steel sheet onto a positioning fixture, and respectively positioning and laminating two composite semi-finished products onto corresponding positions on an upper surface of the large steel sheet; and f) conveying a lower die mechanism to a heating station, and lowering an upper die mechanism to heat a corresponding position of the hot melt adhesive block by means of a heating plate, so that the large steel sheet and the small steel sheet are reliably bonded.

Description

Processing method of supporting steel sheet for folding mobile phone screen TECHNICAL FIELD

[0001] The present application relates to the technical field of supporting steel sheet manufacturing, in particular to a processing method of supporting steel sheet for folding mobile phone screen. BACKGROUND

[0002] The supporting steel sheet of the folding mobile phone comprises a pair of large steel sheets and four small steel sheets, which are adhered to the length direction of the large steel sheets at both ends by double-sided adhesive, and are combined into an integral part with the large steel sheets and the screen through a rotating shaft during final assembly. The existing technology performs processing on the steel sheet through die cutting. Since the thickness of the steel sheet is only 0.03mm, burrs are easily generated at the boundary after punching. Since the supporting steel sheet is applied to the mobile phone screen, it is easy to cause the mobile phone to malfunction. Moreover, the small steel sheet and the large steel sheet are adhered by double-sided adhesive, and the conventional pulling force of the double-sided adhesive is between 2N and 5N. During use of the mobile phone, there is a risk of separation of the small steel sheet and the large steel sheet. Therefore, it is urgent to develop a new processing method of supporting steel sheet to improve the adhesion stability of the small steel sheet and the large steel sheet and remove the burrs of the steel sheet.

[0003] SUMMARY

[0004] In view of the above problems, the present application provides a processing method of supporting steel sheet for folding mobile phone screen, which improves the adhesion stability of the small steel sheet and the large steel sheet, removes the burrs of the steel sheet, and improves the processing production efficiency.

[0005] A processing method of supporting steel sheet for folding mobile phone screen, characterized in that hot melt adhesive is used for adhesion positioning between the small steel sheet and the large steel sheet, a hot melt device is formed by pre-processing, the hot melt device comprises a lower die mechanism movable horizontally and linearly and an upper die mechanism movable vertically, the lower die mechanism comprises a positioning jig, and the upper die mechanism comprises a heating plate. The specific processing comprises the following steps.

[0006] a. The small steel sheet is arrayed and processed by etching process, and the hot melt adhesive is processed into hot melt adhesive blocks by die cutting knife.

[0007] b. The small steel sheet semi-finished product is combined on the corresponding hot melt adhesive block semi-finished product in position, thereby forming an array product of the composite semi-finished product of the small steel sheet and the hot melt adhesive blocks.

[0008] c. Each composite semi-finished product is taken out for standby.

[0009] d. Each large steel sheet is independently processed by etching process.

[0010] e. The lower mold mechanism is transported to the pre-assembly station, the large steel sheet is positioned on the positioning jig, and two composite semi-finished products are respectively positioned and combined on the corresponding positions on the upper surface of the large steel sheet, and the hot melt adhesive of the composite semi-finished product is arranged towards the upper surface of the large steel sheet;

[0011] f. The lower mold mechanism is transported to the heating station, the upper mold mechanism is lowered to heat the corresponding position of the hot melt adhesive block through the heating plate, so that the large steel sheet and the small steel sheet are reliably bonded, and then the upper mold mechanism is reset, and the lower mold is returned to the pre-assembly station. Take out the processed support steel sheet.

[0012] It is further characterized in that:

[0013] In step a, the bottom of the steel sheet is combined with a first protective film, the bottom of the first protective film is combined with a second protective film, the steel sheet is etched to form two rows of small steel sheets arranged in an array, and then the second protective film and the first protective film are separated into a half-connected state by die cutting. Each module structure corresponds to a first alignment hole die-cut at both ends of the width direction of the second protective film, and two small steel sheets arranged in the width direction are arranged in each module structure;

[0014] In step a, the bottom of the hot melt adhesive layer is combined with a third protective film and a fourth protective film, the first roller knife cuts the hot melt adhesive layer into a plurality of hot melt adhesive blocks arranged in a double row in the width direction, then the excess hot melt adhesive is discarded, and then the second roller knife cuts the hot melt adhesive layer and the third protective film to form a module structure with a corresponding shape, and simultaneously cuts the second alignment hole on the third protective film and the fourth protective film;

[0015] In step b, the small steel sheet semi-finished product is turned upside down, so that the first alignment hole and the second alignment hole are aligned, and then the small steel sheet semi-finished product is pressure-combined on the upper surface of the corresponding hot melt adhesive block. Then take down the inverted overall structure, and then remove the fourth protective film;

[0016] In step c, each composite semi-finished product is manually torn along the half-connected edge of the module structure, so that each composite semi-finished product is taken off for standby;

[0017] In step d, the bottom of the steel sheet body of the large steel sheet is combined with a fifth protective film, a pair of large steel sheets designed by etching are formed, and the two large steel sheets are arranged symmetrically in the width direction; then a group of third alignment holes are die-cut at both ends of the exposed fifth protective film in the length direction;

[0018] The upper die mechanism comprises an upper mounting plate, a heating plate assembly, the heating plate assembly comprises a heating plate, a lower mounting plate, the lower mounting plate comprises a lower convex part, the upper center of the lower convex part is a heating plate placing cavity, the heating plate is placed in the heating plate placing cavity, the heating plate is provided with a lower convex heating convex plate corresponding to the hot melt adhesive area of the product below in the working state, and the lower mounting plate is provided with a profiled avoiding hole corresponding to the position of the lower convex heating convex plate, so that the heating is accurate and reliable.

[0019] The positioning jig is a double-cavity mechanism, and the upper die mechanism is a two-group mechanism corresponding to the positioning jig.

[0020] The upper surface of the positioning jig is provided with a plurality of first upper convex columns corresponding to the length direction of both ends of each cavity, and a plurality of second upper convex columns corresponding to both sides of the width direction of each cavity, the first upper convex columns are arranged corresponding to the third alignment hole, and the second upper convex columns are arranged corresponding to the first alignment hole and the second alignment hole.

[0021] After the above technical scheme is adopted, the hot melting device is pre-processed and manufactured, the shapes of the large steel sheet and the small steel sheet are generated through etching, a plurality of arrayed hot melt adhesive blocks are formed through die cutting, then the hot melt adhesive block and the small steel sheet are compounded to form a composite semi-finished product, then the composite semi-finished product is taken down, and the composite semi-finished product (the small steel sheet and the hot melt adhesive) is used for positioning between the large steel sheet, finally, the hot pressure adhesion positioning is completed through the hot melting device, the pulling force between the two steel sheets is greater than 20 N, and the position accuracy can reach ±0.05 mm after the method and the corresponding jig are assembled, the adhesion stability of the assembly of the small steel sheet and the large steel sheet is improved, the burrs of the steel sheet are removed, and the processing and production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a top view of the product of the present application;

[0023] Fig. 2 is a perspective view of the hot melting device corresponding to the present application;

[0024] Fig. 3 is a perspective view of the upper die mechanism of the hot melting device of the present application;

[0025] Fig. 4 is a perspective view of the lower die mechanism of the hot melting device of the present application;

[0026] Fig. 5 is a top view of the small steel sheet after step a of the present application;

[0027] Fig. 6 is a top view of the hot melt adhesive after step a of the present application;

[0028] Fig. 7 is a film layer diagram of the hot melt adhesive in Fig. 6;

[0029] Fig. 8 is a top view of the array product of the composite semi-finished product obtained after step b;

[0030] Fig. 9 is a top view of the large steel sheet after step d of the present application;

[0031] Fig. 10 is a top view of the corresponding product and the lower die mechanism after hot pressing of the present application;

[0032] The names corresponding to the serial numbers in the figures are as follows: small steel sheet 1, hot melt glue block 2, large steel sheet 3, hot melt glue 4, composite semi-finished product 5, first protective film 6, second protective film 7, third protective film 8, fourth protective film 9, first alignment hole 11, second alignment hole 12, fifth protective film 13, third alignment hole 14; hot melting device 10, preloading station 101, heating station 102, lower die mechanism 20, upper die mechanism 30, positioning jig 40, first upper convex column 41, second upper convex column 42, heating plate 50, lower convex heating plate 51, upper mounting plate 60, heating plate assembly 70, lower mounting plate 80, lower convex part 81, profiled avoidance hole 82, module structure 100. DETAILED DESCRIPTION

[0033] A processing method for folding the supporting steel sheet of the mobile phone screen, as shown in Figs. 1-10, which uses hot melt glue for the positioning of the adhesion between the small steel sheet and the large steel sheet, and a hot melting device 10 is pre-processed to form, which includes a lower die mechanism 20 that can move horizontally and linearly, and an upper die mechanism 30 that can move up and down, the lower die mechanism 20 includes a positioning jig 40, and the upper die mechanism 30 includes a heating plate 50. The specific processing includes the following steps:

[0034] a. The small steel sheet 1 is arrayed and processed by etching process, and the hot melt glue 4 is processed into an arrayed hot melt glue block 2 semi-finished product by die cutting knife;

[0035] In the implementation, in step a, the bottom of the steel sheet is compounded with the first protective film 6, the bottom of the first protective film 6 is compounded with the second protective film 7, the steel sheet is formed into two rows of small steel sheets 1 in arrayed arrangement by etching, and then the second protective film 7 and the first protective film 6 are separated by die cutting into a semi-connected state of the module structure 100, each module structure 100 has corresponding first alignment holes 11 at both ends in the width direction of the second protective film 7, and two small steel sheets 1 are arranged in the module structure 100 in the width direction;

[0036] In specific implementation, in step a, the bottom of the hot melt adhesive 4 is compounded with the third protective film 8 and the fourth protective film 9, the first roller cutter cuts the hot melt adhesive layer into a plurality of hot melt adhesive blocks 2 arranged in double rows in the width direction, and then the excess hot melt adhesive 4 is discharged, and then the second roller cutter cuts the hot melt adhesive 2 and the third protective film 8 to form a module structure 100 corresponding to the shape, and at the same time, the second alignment hole 12 is cut on the third protective film 8 and the fourth protective film 9;

[0037] b. Align the semi-finished product of the small steel sheet 1 with the semi-finished product of the corresponding hot melt adhesive block 2 to form an array product of the composite semi-finished product 5 compounded with a plurality of hot melt adhesive blocks 2 and small steel sheets 1. In specific implementation, the semi-finished product of the small steel sheet 1 is directed downward, and then the first alignment hole 11 and the second alignment hole 12 are aligned, and then the semi-finished product of the small steel sheet 1 is pressure-combined with the upper surface of the corresponding hot melt adhesive block 2. After that, the whole structure is removed and the fourth protective film 9 is removed.

[0038] c. Manually tear each composite semi-finished product 5 along the half edge of the module structure 100 to remove each composite semi-finished product 5 for standby;

[0039] d. The bottom of the steel sheet body of the large steel sheet 3 is compounded with the fifth protective film 13, and a pair of large steel sheets 3 designed by etching are formed. The two large steel sheets 3 are arranged symmetrically in the width direction. Then a group of third alignment holes 14 are cut on the exposed fifth protective film 13 at both ends in the length direction.

[0040] e. The lower mold mechanism 20 is transported to the pre-assembly station 101, the large steel sheet 3 is positioned on the positioning jig 40, and the two composite semi-finished products 5 are respectively positioned and compounded on the upper surface of the corresponding position of the large steel sheet 3. In specific implementation, the composite semi-finished product 5 is turned over, the third protective film 8 is removed, the hot melt adhesive block 2 is attached to the upper surface of the large steel sheet 1, and then the first protective film 6 and the second protective film 7 are removed.

[0041] f. The lower mold mechanism 20 is transported to the heating station 102, the upper mold mechanism 30 is lowered to heat the corresponding position of the hot melt adhesive block 2 by the heating plate 50, so that the large steel sheet 3 and the small steel sheet 1 are reliably bonded, and then the upper mold mechanism 30 is reset, the lower mold mechanism 20 is returned to the pre-assembly station 101, and the processed support steel sheet is taken out.

[0042] In specific implementation, the upper die mechanism 30 of the hot melting device 10 comprises an upper mounting plate 60, a heating plate assembly 70, the heating plate assembly 70 comprising the heating plate 50, a lower mounting plate 80, the lower mounting plate 80 comprising a lower convex part 81, the upper center of the lower convex part 81 being a heating plate placement cavity, the heating plate 50 being placed in the heating plate placement cavity, the heating plate 50 being provided with a lower convex heating convex plate 51 corresponding to the hot melting glue area of the product below in the working state, the lower mounting plate 80 being provided with a profiled avoiding hole 82 corresponding to the position of the lower convex heating convex plate 51, which makes the heating accurate and reliable.

[0043] In specific implementation, the positioning jig 40 is a double-cavity mechanism, and the upper die mechanism 30 is a two-group mechanism corresponding to the positioning jig 40, which improves the processing efficiency.

[0044] In order to accurately and reliably process positioning, the upper surface of the positioning jig 40 is provided with a plurality of first upper convex columns 41 corresponding to the length direction of both ends of each cavity, and a plurality of second upper convex columns 42 corresponding to both sides of the width direction of each cavity, the first upper convex columns 41 are provided corresponding to the third alignment hole 14, and the second upper convex columns 42 are provided corresponding to the first alignment hole 11 and the second alignment hole 12, the first upper convex columns 41 are used for alignment of the large steel sheet 3, and the second upper convex columns 42 are used for reliable alignment of the composite semi-finished product 5.

[0045] The working principle is as follows: a hot melting device is processed and formed in advance, the shapes corresponding to the large steel sheet and the small steel sheet are generated by etching, a plurality of arrayed hot melting glue blocks are formed by die cutting, then the hot melting glue blocks and the small steel sheet are compounded to form a composite semi-finished product, then the composite semi-finished product is taken down, and the composite semi-finished product (the small steel sheet and the hot melting glue) is used for positioning between the large steel sheet, finally, hot pressing and adhering positioning is completed by the hot melting device, the pulling force between the two steel sheets is > 20 N, and the position accuracy after assembly by the method and the corresponding jig can reach ± 0.05 mm, which improves the adhering stability of the assembly of the small steel sheet and the large steel sheet, removes the burrs of the steel sheet, and improves the processing and production efficiency.

[0046] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0047] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A processing method for folding a support steel sheet of a mobile phone screen, characterized by, It is used for the adhesive positioning between small steel sheets and large steel sheets by hot melt adhesive, and a hot melt device is formed by pre-processing, which comprises a lower mold mechanism capable of moving horizontally and linearly, and an upper mold mechanism capable of moving up and down, the lower mold mechanism comprises a positioning jig, and the upper mold mechanism comprises a heating plate, and the specific processing comprises the following steps. a. The small steel sheets are arrayed and processed by etching process, and the hot melt adhesive is die-cut into arrayed hot melt adhesive blocks by a die cutter. b. The small steel sheet semi-finished product is aligned and combined on the corresponding hot melt adhesive block semi-finished product, thereby forming an arrayed product of a plurality of hot melt adhesive block-combined small steel sheet semi-finished products. c. Each combined semi-finished product is taken out for standby. d. Each large steel sheet is independently processed by etching process. e. The lower mold mechanism is transported to a pre-assembly station, the large steel sheet is positioned on the positioning jig, and two combined semi-finished products are respectively positioned and combined on the corresponding positions on the upper surface of the large steel sheet, and the hot melt adhesive of the combined semi-finished product is arranged towards the upper surface of the large steel sheet. f. The lower mold mechanism is transported to a heating station, the upper mold mechanism is lowered to heat the corresponding position of the hot melt adhesive block by the heating plate, so that the large steel sheet and the small steel sheet are reliably bonded, and then the upper mold mechanism is reset, and the lower mold is returned to the pre-assembly station, and the processed support steel sheet is taken out.

2. The method of claim 1, wherein the method further comprises: In step a, the bottom of the steel sheet is combined with a first protective film, the bottom of the first protective film is combined with a second protective film, the steel sheet is etched to form two rows of small steel sheets in arrayed arrangement, and then the second protective film and the first protective film are separated into a half-connected module structure by die cutting, each module structure corresponds to a first alignment hole die-cut at both ends of the width direction of the second protective film, and two small steel sheets arranged at intervals in the width direction are arranged in each module structure.

3. The method of claim 2, wherein the method further comprises: In step a, the bottom of the hot melt adhesive layer is combined with a third protective film and a fourth protective film, the first roller cutter cuts the hot melt adhesive layer into a plurality of hot melt adhesive blocks arranged in double rows in the width direction, then the excess hot melt adhesive is discarded, and then the second roller cutter cuts the hot melt adhesive layer and the third protective film to form a module structure of a corresponding shape, while cutting a second alignment hole in the third protective film and the fourth protective film. ​ 4. The method of claim 3, wherein the method further comprises: In step b, the small steel sheet semi-finished product is turned towards the bottom, so that the first alignment hole and the second alignment hole are aligned, and then the small steel sheet semi-finished product is pressure-combined on the upper surface of the corresponding hot melt adhesive block, and then the whole structure is taken out and turned over, and then the fourth protective film is removed.

5. The method of claim 1, wherein the method further comprises: In step c, each combined semi-finished product is manually torn along the half-connected edge of the module structure, thereby taking each combined semi-finished product out for standby.

6. The method of claim 1, wherein the method further comprises: In step d, the bottom of the steel sheet body of the large steel sheet is combined with a fifth protective film, a pair of large steel sheets designed by etching are formed, and the two large steel sheets are arranged symmetrically in the width direction, and then a group of third alignment holes are die-cut at both ends of the exposed fifth protective film in the length direction.

7. The method of claim 1, wherein the method further comprises: The upper die mechanism comprises an upper mounting plate, a heating plate assembly, the heating plate assembly comprises a heating plate, a lower mounting plate, the lower mounting plate comprises a lower convex part, the upper center of the lower convex part is a heating plate placing cavity, the heating plate is placed in the heating plate placing cavity, the heating plate is provided with a lower convex heating convex plate corresponding to the hot melt adhesive area of the product below in the working state, and the lower mounting plate is provided with a profiled avoiding hole corresponding to the position of the lower convex heating convex plate. ​ 8. The method of claim 7, wherein the method further comprises: The positioning jig is a mold double-cavity mechanism, and the upper die mechanism is two groups of mechanisms corresponding to the positioning jig.

9. The method of claim 4, wherein the method further comprises: The upper surface of the positioning jig is provided with a plurality of first upper convex columns corresponding to the length direction of each cavity at both ends, and a plurality of second upper convex columns corresponding to the width direction of each cavity are arranged on both sides, the first upper convex columns are arranged corresponding to the third alignment holes, and the second upper convex columns are arranged corresponding to the first alignment holes and the second alignment holes. ​

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