A processing method for folding a supporting steel sheet of a mobile phone screen

Abstract

The application discloses a processing method for supporting steel sheets of folding mobile phone screens, which improves the adhesion stability of small steel sheet and large steel sheet assembly, and removes the burrs of the steel sheet. It comprises the following steps: a, array arrangement processing of small steel sheets by etching process, and array arrangement of hot melt glue blocks semi-finished products by die cutting knife; b, aligning and compounding the small steel sheet semi-finished products on the corresponding hot melt glue block semi-finished products, thereby forming array products of the composite semi-finished products of the small steel sheets and the hot melt glue blocks; c, taking each composite semi-finished product for standby; d, independently processing each large steel sheet by etching process; e, positioning the large steel sheet on the positioning jig, and positioning and compounding two composite semi-finished products on the corresponding positions of the upper surface of the large steel sheet; f, conveying the lower die mechanism to the heating station, and lowering the upper die mechanism to heat the corresponding position of the hot melt glue block through the heating plate, so that the large steel sheet and the small steel sheet are reliably bonded.

Description

Technical Field

[0001] This invention relates to the technical field of support steel sheet manufacturing, specifically a processing method for support steel sheets used in foldable mobile phone screens. Background Technology

[0002] The supporting steel plate of the folding phone, its structure is shown in [reference needed]. Figure 1 The device comprises a pair of large steel sheets and four small steel sheets. The four small steel sheets are divided into two pairs and are attached to both ends of the large steel sheets along their length using double-sided adhesive. During final assembly, the pairs of large steel sheets and the screen are combined into a single unit via a pivot (not shown in the diagram). Current technology involves die-cutting the steel sheets during assembly. Since the steel sheets are only 0.03mm thick, burrs are easily generated at the edges after die-cutting. Because this support steel sheet is used in mobile phone screens, it can easily cause phone malfunctions. Furthermore, the existing support steel sheets are bonded to the large and small steel sheets using double-sided adhesive, which typically has a pull-out force between 2N and 5N. During phone use, there is a risk of the small and large steel sheets detaching. Therefore, there is an urgent need to develop a new processing method for the support steel sheets to improve the adhesion stability of the small and large steel sheets during assembly and to remove burrs. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a processing method for supporting steel sheets for foldable mobile phone screens, which improves the adhesion stability of small and large steel sheets during assembly, removes burrs from the steel sheets, and simultaneously improves processing and production efficiency.

[0004] A method for processing a support steel sheet for a foldable mobile phone screen is characterized by using hot melt adhesive for adhesion and positioning between small and large steel sheets, pre-processing to form a hot melt device, the hot melt device including a lower mold mechanism that can move horizontally and linearly, and an upper mold mechanism that can move vertically and vertically, the lower mold mechanism including a positioning fixture, and the upper mold mechanism including a heating plate, the specific processing includes the following steps;

[0005] a. Small steel sheets are arranged in an array using an etching process, and hot melt adhesive is die-cut into arrayed hot melt adhesive blocks as semi-finished products using a die-cutting knife;

[0006] b. Align and laminate the small steel sheet semi-finished products onto the corresponding hot melt adhesive block semi-finished products to form an array of composite semi-finished products with several hot melt adhesive blocks and small steel sheets.

[0007] c. Remove each composite semi-finished product for later use;

[0008] d. Each large steel sheet is individually processed using an etching process;

[0009] e. The lower mold mechanism is transported to the pre-assembly station, the large steel sheet is positioned on the positioning fixture, and the two composite semi-finished products are respectively positioned and composited on the corresponding positions of the upper surface of the large steel sheet. The hot melt adhesive of the composite semi-finished products is arranged facing the upper surface of the large steel sheet.

[0010] f. The lower mold mechanism is transported to the heating station, and the upper mold mechanism descends 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. After that, the upper mold mechanism is reset, the lower mold returns to the pre-installation station, and the processed support steel sheet is taken out.

[0011] Its further features are:

[0012] In step a, a first protective film is laminated to the bottom of the steel sheet, and a second protective film is laminated to the bottom of the first protective film. The steel sheet is etched to form two rows of small steel sheets arranged in an array. Then, the second protective film and the first protective film are separated into a semi-connected module structure by die cutting. Each module structure has corresponding first alignment holes die-cut at both ends of the width direction of the second protective film. Each module structure contains two small steel sheets arranged at intervals in the width direction.

[0013] In step a, the bottom of the hot melt adhesive layer is laminated with a third protective film and a fourth protective film. The first roller cutter punches the hot melt adhesive layer into several hot melt adhesive blocks arranged in double rows in the width direction. Then, the excess hot melt adhesive is discharged as waste. After that, the second roller cutter punches the hot melt adhesive layer and the third protective film to form a module structure of corresponding shape, and punches the third protective film and the fourth protective film to form a second alignment hole.

[0014] In step b, the small steel sheet semi-finished product is placed with the small steel sheet facing down so that the first alignment hole and the second alignment hole are aligned. Then, the small steel sheet semi-finished product is pressure bonded to the upper surface of the corresponding hot melt adhesive block. After that, the entire structure is removed and flipped over, and then the fourth protective film is removed.

[0015] In step c, each composite semi-finished product is manually torn off along the half-connecting edge of the module structure, thereby removing each composite semi-finished product for later use.

[0016] In step d, the bottom of the steel sheet body used to make the large steel sheet is coated with a fifth protective film. A pair of large steel sheets are formed by etching. The two large steel sheets are arranged symmetrically in the width direction. Then, a set of third alignment holes are punched at both ends of the exposed fifth protective film in the length direction.

[0017] The upper mold mechanism includes an upper mounting plate and a heating plate assembly. The heating plate assembly includes a heating plate and a lower mounting plate. The lower mounting plate includes a lower protruding portion. The upper center of the lower protruding portion is a heating plate placement cavity. The heating plate is placed in the heating plate placement cavity. The heating plate is provided with a lower protruding heating protrusion corresponding to the hot melt adhesive area of ​​the product below when it is in the working state. The lower mounting plate is provided with a contoured clearance hole corresponding to the position of the lower protruding heating protrusion, which makes the heating precise and reliable.

[0018] The positioning fixture is a single-mold double-cavity mechanism, and the upper mold mechanism consists of two sets of mechanisms corresponding to the positioning fixture.

[0019] The positioning fixture has several first upper protrusions on both ends of the length direction of each cavity on its upper surface, and several second upper protrusions on both sides of the width direction of each cavity. The first upper protrusions are set in accordance with the third alignment hole, and the second upper protrusions are set in accordance with the first alignment hole and the second alignment hole.

[0020] After adopting the above technical solution, a hot melt device is pre-processed and manufactured. The shapes of corresponding large and small steel sheets are generated by etching. Several arrayed hot melt adhesive blocks are formed by die cutting. Then, the hot melt adhesive blocks and small steel sheets are combined to form a composite semi-finished product. Subsequently, the composite semi-finished product (small steel sheets and hot melt adhesive) is removed and used for positioning between it and the large steel sheet. Finally, the hot-pressing adhesion positioning is completed by the hot melt device. The pull-out force between the two steel sheets is >20N. After assembly with the corresponding fixture, the positional accuracy can reach ±0.05mm. This improves the adhesion stability of the small and large steel sheets and removes the burrs on the steel sheets, while also improving the processing and production efficiency. Attached Figure Description

[0021] Figure 1 This is a top view of the product of the present invention;

[0022] Figure 2 This is a perspective view of the hot-melt device corresponding to the present invention;

[0023] Figure 3 This is a three-dimensional schematic diagram of the upper mold mechanism of the hot melt apparatus of the present invention;

[0024] Figure 4 This is a three-dimensional schematic diagram of the lower mold mechanism of the hot melt device of the present invention;

[0025] Figure 5 This is a top view of the small steel sheet of the present invention after processing in step a;

[0026] Figure 6 This is a top view of the hot melt adhesive of the present invention after processing in step a;

[0027] Figure 7 for Figure 6 A schematic diagram of the film layers of medium-temperature melt adhesive;

[0028] Figure 8 This is a top view of the array of composite semi-finished products obtained after step b;

[0029] Figure 9 This is a top view of the large steel sheet of the present invention after processing in step d;

[0030] Figure 10 This is a top view of the product and lower mold mechanism corresponding to the present invention after hot pressing;

[0031] The names corresponding to the serial numbers in the diagram are as follows:

[0032] 1. Small steel sheet; 2. Hot melt adhesive block; 3. Large steel sheet; 4. Hot melt adhesive; 5. Semi-finished product; 6. First protective film; 7. Second protective film; 8. Third protective film; 9. Fourth protective film; 11. First alignment hole; 12. Second alignment hole; 13. Fifth protective film; 14. Third alignment hole.

[0033] Hot melt device 10, pre-assembly station 101, heating station 102, lower mold mechanism 20, upper mold mechanism 30, positioning fixture 40, first upper protrusion 41, second upper protrusion 42, heating plate 50, lower protrusion heating plate 51, upper mounting plate 60, heating plate assembly 70, lower mounting plate 80, lower protrusion part 81, contour avoidance hole 82, module structure 100. Detailed Implementation

[0034] A method for processing a support steel sheet for a foldable mobile phone screen, see [link to documentation]. Figures 1-10 It uses hot melt adhesive for adhesion and positioning between small and large steel sheets, and pre-processes to form a hot melt device 10. The hot melt device 10 includes a lower mold mechanism 20 that can move horizontally and linearly, and an upper mold mechanism 30 that can move vertically. The lower mold mechanism 20 includes a positioning fixture 40, and the upper mold mechanism 30 includes a heating plate 50. The specific processing includes the following steps.

[0035] a. The small steel sheet 1 is processed by etching to form an array, and the hot melt adhesive 4 is die-cut into an array of hot melt adhesive blocks 2 semi-finished products by die-cutting.

[0036] In specific implementation, in step a, the bottom of the steel sheet is coated with a first protective film 6, the bottom of the first protective film 6 is coated with a second protective film 7, the steel sheet is etched to form two rows of small steel sheets 1 arranged in an array, and then the second protective film 7 and the first protective film 6 are separated into a semi-connected module structure 100 by die cutting. Each module structure 100 has corresponding first alignment holes 11 die-cut at both ends of the width direction of the second protective film 7, and each module structure 100 is provided with two small steel sheets 1 arranged at intervals in the width direction.

[0037] In specific implementation, in step a, the bottom of the hot melt adhesive 4 is laminated with a third protective film 8 and a fourth protective film 9. The first roller cutter punches the hot melt adhesive layer into several hot melt adhesive blocks 2 arranged in double rows in the width direction. Then, the excess hot melt adhesive 4 is discharged as waste. After that, the second roller cutter punches the hot melt adhesive 2 and the third protective film 8 to form a module structure 100 of the corresponding shape. At the same time, the second alignment hole 12 is punched on the third protective film 8 and the fourth protective film 9.

[0038] b. Align and laminate the semi-finished product of the small steel sheet 1 onto the corresponding semi-finished product of the hot melt adhesive block 2, thereby forming an array product of composite semi-finished products 5 with several hot melt adhesive blocks 2 and small steel sheets 1. In specific implementation, the semi-finished product of the small steel sheet 1 is facing down, so that 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 laminated onto the upper surface of the corresponding hot melt adhesive block 2. After that, the entire structure is removed and flipped over, and then the fourth protective film 9 is removed.

[0039] c. Manually tear off each composite semi-finished product 5 along the half-connected edge of the module structure 100, thereby removing each composite semi-finished product 5 for later use.

[0040] d. The bottom of the steel sheet body of the large steel sheet 3 is coated with a fifth protective film 13. A pair of large steel sheets 3 for design are formed by etching. The two large steel sheets 3 are arranged symmetrically in the width direction. Then, a set of third alignment holes 14 are punched at both ends of the exposed fifth protective film 13 in the length direction.

[0041] e. The lower mold mechanism 20 is transported to the pre-assembly station 101, the large steel sheet 3 is positioned on the positioning fixture 40, and the two composite semi-finished products 5 are respectively positioned and composited on the corresponding positions of the upper surface of the large steel sheet 3. In specific implementation, the composite semi-finished product 5 is flipped over, the third protective film 8 is removed, so that 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 peeled off.

[0042] f. The lower mold mechanism 20 is transported to the heating station 102. The upper mold mechanism 30 descends and heats the corresponding position of the hot melt adhesive block 2 through the heating plate 50, so that the large steel sheet 3 and the small steel sheet 1 are reliably bonded. 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.

[0043] In specific implementation, the upper mold mechanism 30 of the hot melt device 10 includes an upper mounting plate 60 and a heating plate assembly 70. The heating plate assembly 70 includes a heating plate 50 and a lower mounting plate 80. The lower mounting plate 80 includes a lower protruding part 81. The upper center of the lower protruding part 81 is a heating plate placement cavity. The heating plate 50 is placed in the heating plate placement cavity. The heating plate 50 is provided with a lower protruding heating protrusion 51 corresponding to the hot melt adhesive area of ​​the product below when it is in working state. The lower mounting plate 80 is provided with a contoured avoidance hole 82 corresponding to the position of the lower protruding heating protrusion 51, which makes the heating accurate and reliable.

[0044] In practice, the positioning fixture 40 is a double-cavity mold mechanism, and the upper mold mechanism 30 consists of two sets of mechanisms corresponding to the positioning fixture 40, which improves processing efficiency.

[0045] To ensure accurate and reliable machining and positioning, the upper surface of the positioning fixture 40 is provided with several first upper protrusions 41 at both ends of the length direction corresponding to each cavity, and several second upper protrusions 42 are provided on both sides of the width direction corresponding to each cavity. The first upper protrusions 41 are set to the third alignment hole 14, and the second upper protrusions 42 are set to align with the first alignment hole 11 and the second alignment hole 12. The first upper protrusions 41 are used for the alignment of the large steel sheet 3, and the second upper protrusions 42 are used for the reliable alignment of the composite semi-finished product 5.

[0046] Its working principle is as follows: a hot melt device is pre-processed and manufactured. The shapes of corresponding large and small steel sheets are generated by etching. Several arrayed hot melt adhesive blocks are formed by die cutting. Then, the hot melt adhesive blocks and small steel sheets are combined to form a composite semi-finished product. The composite semi-finished product is then removed and used for positioning between the composite semi-finished product and the large steel sheet. Finally, the hot melt device completes the hot-pressing adhesion positioning. The pull-out force between the two steel sheets is >20N. After assembly using this method and the corresponding fixture, the positional accuracy can reach ±0.05mm. This improves the adhesion stability of the small and large steel sheets and removes the burrs on the steel sheets, while also improving processing and production efficiency.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for processing a support steel sheet for a foldable mobile phone screen, characterized in that, It uses hot melt adhesive for adhesion and positioning between small and large steel sheets. The hot melt device is pre-processed and manufactured. The hot melt device includes a lower mold mechanism that can move horizontally and linearly, and an upper mold mechanism that can move up and down. The lower mold mechanism includes a positioning fixture, and the upper mold mechanism includes a heating plate. The specific processing includes the following steps. a. Small steel sheets are arranged in an array using an etching process, and hot melt adhesive is die-cut into arrayed hot melt adhesive blocks as semi-finished products using a die-cutting knife; b. Align and laminate the small steel sheet semi-finished products onto the corresponding hot melt adhesive block semi-finished products to form an array of composite semi-finished products with several hot melt adhesive blocks and small steel sheets. c. Remove each composite semi-finished product for later use; d. Each large steel sheet is individually processed using an etching process; e. The lower mold mechanism is transported to the pre-assembly station, the large steel sheet is positioned on the positioning fixture, and the two composite semi-finished products are respectively positioned and composited on the corresponding positions of the upper surface of the large steel sheet. The hot melt adhesive of the composite semi-finished products is arranged facing the upper surface of the large steel sheet. f. The lower mold mechanism is transported to the heating station, and the upper mold mechanism descends 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. After that, the upper mold mechanism is reset, the lower mold returns to the pre-installation station, and the processed support steel sheet is taken out.

2. The processing method of a support steel sheet for a foldable mobile phone screen according to claim 1, characterized in that: In step a, a first protective film is laminated to the bottom of the steel sheet, and a second protective film is laminated to the bottom of the first protective film. The steel sheet is etched to form two rows of small steel sheets arranged in an array. Then, the second protective film and the first protective film are separated into a semi-connected module structure by die cutting. Each module structure has a corresponding first alignment hole die-cut at both ends of the width direction of the second protective film. Each module structure contains two small steel sheets arranged at intervals in the width direction.

3. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 2, characterized in that: In step a, the bottom of the hot melt adhesive layer is laminated with a third protective film and a fourth protective film. The first roller cutter punches the hot melt adhesive layer into several hot melt adhesive blocks arranged in double rows in the width direction. Then, the excess hot melt adhesive is discharged as waste. After that, the second roller cutter punches the hot melt adhesive layer and the third protective film to form a module structure of corresponding shape, and punches the third protective film and the fourth protective film to form a second alignment hole.

4. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 3, characterized in that: In step b, the small steel sheet semi-finished product is placed with the small steel sheet facing downwards so that the first alignment hole and the second alignment hole are aligned. Then, the small steel sheet semi-finished product is pressure bonded to the upper surface of the corresponding hot melt adhesive block. After that, the entire structure is removed and flipped over, and then the fourth protective film is removed.

5. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 4, characterized in that: In step c, each composite semi-finished product is manually torn off along the half-connecting edge of the module structure, thereby removing each composite semi-finished product for later use.

6. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 4, characterized in that: In step d, the bottom of the steel sheet body used to make the large steel sheet is coated with a fifth protective film. A pair of large steel sheets are formed by etching. The two large steel sheets are arranged symmetrically in the width direction. Then, a set of third alignment holes are punched at both ends of the exposed fifth protective film in the length direction.

7. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 1, characterized in that: The upper mold mechanism includes an upper mounting plate and a heating plate assembly. The heating plate assembly includes a heating plate and a lower mounting plate. The lower mounting plate includes a lower protruding portion. The upper center of the lower protruding portion is a heating plate placement cavity. The heating plate is placed in the heating plate placement cavity. The heating plate is provided with a lower protruding heating plate corresponding to the hot melt adhesive area of ​​the product below when it is in the working state. The lower mounting plate is provided with a contoured clearance hole corresponding to the position of the lower protruding heating plate.

8. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 7, characterized in that: The positioning fixture is a single-mold double-cavity mechanism, and the upper mold mechanism consists of two sets of mechanisms corresponding to the positioning fixture.

9. A method for processing a support steel sheet for a foldable mobile phone screen according to claim 6, characterized in that: The positioning fixture has several first upper protrusions on both ends of the length direction of each cavity on its upper surface, and several second upper protrusions on both sides of the width direction of each cavity. The first upper protrusions are set in accordance with the third alignment hole, and the second upper protrusions are set in accordance with the first alignment hole and the second alignment hole.

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