CN107819089B - Manufacturing process and forming equipment of 3D battery cover - Google Patents
Manufacturing process and forming equipment of 3D battery cover Download PDFInfo
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- CN107819089B CN107819089B CN201711160914.4A CN201711160914A CN107819089B CN 107819089 B CN107819089 B CN 107819089B CN 201711160914 A CN201711160914 A CN 201711160914A CN 107819089 B CN107819089 B CN 107819089B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 54
- 239000010408 film Substances 0.000 claims abstract description 35
- 238000007639 printing Methods 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 239000011265 semifinished product Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 16
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000013329 compounding Methods 0.000 claims abstract description 8
- 239000012788 optical film Substances 0.000 claims abstract description 8
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 56
- 238000010438 heat treatment Methods 0.000 claims description 49
- 238000013519 translation Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 14
- 238000009713 electroplating Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 238000010023 transfer printing Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 11
- 238000007493 shaping process Methods 0.000 description 9
- 238000005282 brightening Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention discloses a manufacturing process of a 3D battery cover, which is realized through the following steps: compounding a PMMA film and a PC film together to form a composite board, and sequentially arranging a LOGO pattern printing layer, a UV transfer printing texture pattern layer, an optical film layer and a ground color ink layer on the bottom surface of the PC film from top to bottom to form a sheet to be formed; and (3) placing the sheet to be formed on forming equipment for high-pressure forming to form a formed semi-finished product, spraying UV hardening liquid on the top of the surface of the formed semi-finished product by using a pressure gun, fully distributing the UV hardening liquid on the surface of the formed semi-finished product, drying to form a surface treatment piece, and carrying out reverse side placing and cutting on the surface treatment piece by using a CNC cutting machine to form the 3D battery cover finished product. Compared with the prior art, the battery cover has the advantages of good toughness, higher hardness, high molding yield and high surface highlighting effect on the premise of achieving better strength. The invention also discloses forming equipment of the 3D battery cover.
Description
Technical Field
The invention relates to the field of manufacturing of mobile phone accessories, in particular to a manufacturing process of a 3D battery cover and forming equipment for forming the 3D battery cover.
Background
Most of battery covers of various communication electronic and household appliances in the market are made of plastic materials, and meanwhile, in order to prevent surface patterns from being scratched, a pattern layer is generally arranged on the back surface of the battery cover, so that the patterns can keep clear colors for a long time and are not easy to fade, and the battery covers are also the demands of society. In order to enhance the appearance effect of the battery cover, the purpose of presenting the stereoscopic pattern effect is generally achieved by performing repeated superposition printing by using UV varnish. However, the hardness of the battery cover made of the plastic material is slightly poor, and the battery cover cannot show a bright effect; meanwhile, the traditional plastic battery cover adopts a hot-press molding process, but the hardness of the battery cover is not high, and the problem of surface damage is easy to cause during molding.
In view of the above, the present inventors have conducted intensive studies on the above problems, and have resulted from the present invention.
Disclosure of Invention
Therefore, the invention aims to provide a manufacturing process of a 3D battery cover, which solves the problems of poor hardness, no bright effect and damaged molding surface of the existing battery cover.
The invention further aims to provide a forming device for the 3D battery cover, which is used for solving the problem that the surface of the existing battery cover is easy to damage during forming.
In order to achieve the above object, the solution of the present invention is: the manufacturing process of the 3D battery cover is realized through the following steps:
1. compounding the sheet material, compounding the PMMA film and the PC film together to form a composite board,
and the thickness of the PMMA film is thinner than that of the PC film;
2. printing, namely printing a LOGO pattern printing layer on the bottom surface of the PC film by taking the surface of the PC film, which is opposite to the PMMA film, transferring a UV transfer texture pattern layer on the LOGO pattern printing layer through UV glue, electroplating an optical film layer on the UV transfer texture pattern layer, and finally printing a ground color ink layer on the optical film layer to form a sheet to be formed;
3. the sheet to be formed in the third step is placed on forming equipment for high-pressure forming, the forming equipment comprises a lower die plate, a material pressing plate, a heating plate and an upper die plate which are sequentially arranged from top to bottom, a forming cavity is recessed in the top surface of the lower die plate, a negative pressure air suction hole for inflow of external negative pressure air is formed in the cavity bottom of the forming cavity, a forming die plate which is matched with the shape of a mobile phone rear cover is placed in the forming cavity, an air inlet gap is formed between the forming die plate and the inner cavity wall of a forming cavity, a through hole which is matched with the forming cavity is formed in the material pressing plate in a position corresponding to the forming cavity in an aligned mode, and a high-pressure air blowing hole for inflow of external high pressure air is formed in the position of the upper die plate corresponding to the forming cavity;
in the molding process, a sheet to be molded is firstly laid on a lower template, a molding cavity falls into the range of the sheet to be molded, then a pressing plate and the lower template move upwards, the pressing plate and the lower template are overlapped up and down, a heating plate and the pressing plate are overlapped up and down, the heating plate is started, the sheet to be molded is baked in an infrared heating mode, the baking temperature is 360-380 ℃, the baking time is 35-40 s, when the sheet to be molded is baked for 18-20 s, negative pressure air suction holes flow out of negative pressure air, the negative pressure of the negative pressure air is gradually increased, when the negative pressure of the negative pressure air reaches 38-49 Pa, the baking is carried out at a constant pressure, after the heating plate is removed from the upper template, the negative pressure air suction holes keep blowing out of the negative pressure air, the upper template and the pressing plate are overlapped up together, then the high pressure air is blown out of the high pressure air of the upper template, the high pressure output of the high pressure air is in a multi-stage type high pressure output with different pressure value, and finally, the part of the sheet to be molded at the position of the molding cavity is sucked into a room to be matched with the molding template, thus forming a semi-finished product, and the molding semi-finished product is demolding from molding equipment;
4. spraying the UV hardening liquid on the top of the surface of the semi-finished product by using a pressure gun until the surface of the semi-finished product is fully covered with the UV hardening liquid, and drying to form a surface treatment piece;
5. and D, carrying out reverse side placement cutting on the surface treatment piece in the fourth step by adopting a CNC cutting machine to form a 3D battery cover finished product.
And D, forming the UV hardening liquid on the surface of the finished product in the step four, wherein the thickness of the UV hardening liquid is 2um.
The thickness ratio of the PMMA film to the PC film was 1:9.
the multi-section high-pressure output is three-section high-pressure output, wherein the three-section high-pressure output is divided into a first section high-pressure output, a second section high-pressure output and a third section high-pressure output, the high-pressure gas pressure of the first section high-pressure output is 10-20 Mpa, and the output time is 0.5-1 s; the pressure of the high-pressure gas output by the second stage is 30-50 Mpa, and the output time is 0.5-1 s; the pressure of the high-pressure gas output by the third section is 80-100 Mpa, and the output time is 10-15 s.
The utility model provides a 3D battery cover's former, which comprises a frame, be equipped with the lower bolster that from bottom to top sets gradually in the above-mentioned frame, the pressure flitch, hot plate and cope match-plate pattern, above-mentioned lower bolster is with the mode movable mounting in the frame of sliding from top to bottom and reciprocate, and install the lower translation drive arrangement that controls lower bolster oscilaltion and lower bolster back-and-forth movement on the frame, the upper surface of above-mentioned lower bolster is concave down has the shaping cavity, the negative pressure inlet port that supplies external negative pressure gas to get into is offered at the chamber bottom of above-mentioned shaping cavity, the shaping cavity interior activity has placed the shaping template that coincides with the shape of cell-phone back cover, the periphery edge of above-mentioned shaping template has the air inlet gap with between the inside wall of above-mentioned shaping cavity, above-mentioned pressure flitch is installed in the above-mentioned frame with the mode of oscilaltion, install the last drive arrangement that controls the pressure flitch and go up and down in the mode, and the above-mentioned pressure flitch corresponds the position department that the shaping cavity has set up and has the through-hole that coincides with the shaping cavity, above-mentioned hot plate is installed in the mode that moves back and before the aforesaid pressure flitch is installed on the frame, the above-mentioned frame is equipped with the high pressure air hole that the air hole is blown down on the position is equipped with the above-pressure device on the frame side face side of the above-mentioned shaping cavity.
The lower die plate, the material pressing plate, the heating plate and the upper die plate are square blocks, four forming concave cavities are formed in the lower die plate and are arranged in two rows and two columns, four through holes are correspondingly formed in the four forming concave cavities, and the four forming concave cavities and the four through holes are arranged in a vertically aligned mode.
Four positioning columns are fixedly arranged on the upper surface of the template corresponding to each molding concave cavity, and the four positioning columns on each molding concave cavity are correspondingly positioned outside four corners of the molding concave cavity.
The heating plate is an infrared heating plate.
The frame is provided with side posts positioned on the left side and the right side, a lower hollow square frame positioned between the side posts on the two sides and fixed with the side posts, an upper hollow square frame positioned between the side posts on the two sides and positioned above the hollow square frame body, and a top frame positioned on the top surfaces of the side posts on the two sides and fixedly connected with the side posts; a sliding frame along the front-back direction of the lower hollow square frame is arranged in the hollow range of the lower hollow square frame, the lower template is arranged above the sliding frame, a vertically arranged lower lifting cylinder is arranged on the bottom surface of the sliding frame, the free end part of a piston rod of the lower lifting cylinder movably penetrates through the sliding frame to be fixedly connected with the lower template, the lower lifting cylinder is a lower lifting driving device, a lower translation cylinder horizontally arranged along the front-back direction of the frame is arranged on the lower hollow square frame, the lower translation cylinder is positioned behind the sliding frame, the free end part of the piston rod of the lower translation cylinder is fixedly connected with the rear side surface of the sliding frame, and the lower translation cylinder is the lower translation driving device; the frame is also provided with guide upright posts positioned outside the left side and the right side of the pressing plate, the left side and the right side of the pressing plate are respectively provided with guide mounting blocks sleeved outside the guide upright posts in a protruding mode, the upper lifting driving device comprises a screw rod and a driving motor for driving the screw rod to rotate, the screw rod is vertically arranged and penetrates through the guide mounting blocks on the left side or the right side of the pressing plate, and the guide mounting blocks are in threaded connection with the screw rod; the heating plate is arranged in the hollow cavity of the upper hollow square frame in a front-back sliding mode, an upper translation cylinder which is positioned behind the heating plate and horizontally arranged along the front-back direction of the frame is arranged on the upper hollow square frame, the free end part of a piston rod of the upper translation cylinder is fixedly matched with the rear side surface of the heating plate, and the upper translation cylinder is the upper translation driving device.
Positioning guide posts are respectively erected at four corners of the upper surface of the lower die plate, and guide perforations through which the positioning guide posts pass are correspondingly formed at the positions of the pressing plate corresponding to the positioning guide posts one by one.
After the technical scheme is adopted, the manufacturing process of the 3D battery cover has the following beneficial effects:
1. the battery cover has good toughness on the premise of achieving better strength by compounding the PMMA film and the PC film, so that the hardness of the battery cover is higher and can reach 6H;
2. the semi-finished product with the curved 3D mobile phone rear cover is molded by utilizing the mode that the composite board is heated and softened and then negative pressure suction and high pressure blowing are adopted during molding, the molding mode can improve the surface brightening effect of the mobile phone rear cover, the surface of a molded sheet is not damaged, the molding yield is high, and the side arc of the molded mobile phone rear cover has a refraction effect to further play a role in brightening the surface of the mobile phone rear cover;
3. the hardening treatment of the surface of the mobile phone rear cover after the molding adopts a curtain coating mode, so that the hardening liquid can uniformly stay on the surface of the mobile phone rear cover after the molding, and the surface of the mobile phone rear cover can be further brightened.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of a molding apparatus according to the present invention;
fig. 3 is a schematic view of another angle of the molding apparatus of the present invention.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
The manufacturing process of the 3D battery cover is realized through the following steps:
1. sheet compounding, as shown in fig. 1, the PMMA film 100 and the PC film 200 are compounded together to form a composite board, the thickness of the PMMA film 100 is thinner than that of the PC film 200, the PMMA film 100 is positioned above the PC film 200, and the two are completely overlapped;
2. printing, namely printing a LOGO pattern printing layer 300 on the bottom surface of the PC film 200, transferring a UV transfer printing texture pattern layer 400 on the LOGO pattern printing layer 300 through UV glue, namely printing pattern textures such as grating textures on the LOGO pattern printing layer 300 through UV glue and a UV printing process, electroplating an optical film layer 500 on the UV transfer printing texture pattern layer 400, namely electroplating an optical film on the UV transfer printing texture pattern layer 400 in an electroplating manner, and finally printing a ground color ink layer 600 on the optical film layer 500, namely printing by adopting common color ink to enable the color of the composite board to be colorful, so as to form a sheet to be formed; the LOGO pattern printing, UV printing, electroplating process and ground color printing in the second step are all known technologies;
3. the sheet to be formed in the third step is placed on forming equipment for high-pressure forming, as shown in fig. 2, the forming equipment comprises a lower die plate 1, a material pressing plate 2, a heating plate 3 and an upper die plate 4 which are sequentially arranged from top to bottom, a forming cavity 11 is recessed on the top surface of the lower die plate 1, a negative pressure air suction hole 111 for inflow of external negative pressure air is formed in the cavity bottom of the forming cavity 11, a forming die plate (not shown in the drawing) which is identical in shape with a mobile phone rear cover is placed in the forming cavity 11, the forming die plate is of a sheet-shaped structure, a forming bulge which is identical in size and shape with the mobile phone rear cover is convexly arranged at the central part of the upper surface of the forming die plate, an air inlet gap is formed between the forming die plate and the inner cavity wall of a forming cavity, a through hole 21 which is identical with the forming cavity 11 is formed in an alignment manner at the position of the material pressing plate 2 corresponding to the forming cavity 11, and a high-pressure air blowing hole 41 for blowing high-pressure air is formed at the position of the upper die plate 4 corresponding to the forming cavity 11;
in the molding process, a sheet to be molded is firstly laid on the upper surface of a lower template 1 and is positioned outside a molding cavity 11, namely, a part for molding the sheet to be molded is positioned right above the molding cavity 11, then the lower template 1 moves upwards and coincides with a pressing plate 2, the lower template 1 and the pressing plate 2 move upwards synchronously, the pressing plate 2 rises to the lower part of the heating plate 3 and coincides with the upper part and the lower part of the heating plate 3, the heating plate 3 is started, the sheet to be molded is baked in an infrared heating mode, the baking temperature is 360-380 ℃, the baking time is 35-40 seconds, negative pressure space is generated by the negative pressure suction hole 111 when the sheet to be molded is baked for 18-20 seconds in the baking process, the negative pressure is gradually increased, the negative pressure is constant pressure baked after the negative pressure reaches 38-49 Pa, until the baking time reaches 35-40 seconds, the heating plate 3 is removed from the upper template 4, the negative pressure suction hole 111 keeps blowing out negative pressure gas of the above pressure (namely, the negative pressure gas is 38-49 Pa), the lower template 1 moves upwards and the upper part and the lower plate 2 synchronously, the negative pressure gas is baked with the upper part and then the upper part and the lower plate 4 are separated from the upper part and form 2, the lower part is separated from the upper part and the lower plate 2 and the lower plate is blown out of the molding cavity, and the molding cavity is matched with the molding cavity is formed, and the molding cavity is a finished product, the molding cavity is formed, and the molding cavity is separated from the upper part and the lower molding cavity and the molding cavity is formed;
4. the step three of spray coating treatment, in which the formed semi-finished product taken out in the step three is vertically placed, the UV hardening liquid is sprayed on the top of the surface of the formed semi-finished product by a pressure gun, the UV hardening liquid flows downwards to the surface of the formed semi-finished product under the action of self gravity, after the surface of the formed semi-finished product is fully covered with the UV hardening liquid, the formed semi-finished product is sent to a UV oven for UV drying to form a surface treatment piece with a layer of UV hardening liquid layer 700 on the surface of the PMMA film 1;
5. and D, carrying out reverse side placement cutting on the surface treatment piece in the fourth step by adopting a CNC cutting machine to form a 3D battery cover finished product, wherein the cutting process adopts the prior art.
The manufacturing process of the 3D battery cover has the following beneficial effects:
1. the battery cover has good toughness on the premise of achieving better strength by utilizing the compounding of the PMMA film 100 and the PC film 200, so that the hardness of the battery cover is higher and can reach 6H;
2. the semi-finished product with the curved 3D mobile phone rear cover is molded by utilizing the mode that the composite board is heated and softened and then negative pressure suction and high pressure blowing are adopted during molding, the molding mode can improve the surface brightening effect of the mobile phone rear cover, the surface of a molded sheet is not damaged, the molding yield is high, and the side arc of the molded mobile phone rear cover has a refraction effect to further play a role in brightening the surface of the mobile phone rear cover;
3. the hardening treatment of the surface of the mobile phone rear cover after molding adopts a shower coating mode, so that hardening liquid can uniformly stay on the surface of the mobile phone rear cover after molding, the surface of the mobile phone rear cover is further lightened, and the molded mobile phone rear cover has a highlight effect.
The 3D mobile phone rear cover formed by the process is subjected to performance test to obtain the following data:
from the table, the highlight effect of the rear cover of the 3D mobile phone formed by the process can achieve the glass effect, and breakthrough progress is made in the industry.
In the molding process of the present invention, the thickness of the UV curable liquid layer 700 in the fourth step is 2um.
In the molding process of the invention, the thickness ratio of the PMMA film to the PC film is optimally 1:9, the limitation of the proportion is obtained by the research and development of the applicant for many years, and the proportion can reach the hardness required by the mobile phone rear cover or the toughness required by the mobile phone rear cover on the premise of low cost.
According to the forming process, experiments and researches carried out for many years by the inventor show that the output of the high-pressure gas is preferably three-section high-pressure output in the forming process, wherein the three-section high-pressure output is divided into a first-section high-pressure output, a second-section high-pressure output and a third-section high-pressure output, the pressure of the high-pressure gas of the first-section high-pressure output is 10-20 Mpa, and the output time is 0.5-1 s; immediately outputting the second-stage high-pressure gas, wherein the pressure of the high-pressure gas output by the second stage is 30-50 Mpa, and the output time is 0.5-1 s; outputting the third section of high-pressure gas, wherein the pressure of the high-pressure gas output by the third section of high-pressure gas is 80-100 Mpa, and the output time is 10-15 s; the output of the multi-stage high-pressure gas is adopted to ensure that the surface of the formed sheet is not damaged during forming, thereby further improving the yield.
In the forming process, in the second step, the UV glue is preferably highlight type UV glue, so that the surface brightening effect of the battery cover can be further improved.
The invention relates to a forming device of a 3D battery cover, as shown in figures 2 and 3, which comprises a frame, wherein the frame is provided with a lower template 1, a pressing plate 2, a heating plate 3 and an upper template 4 which are sequentially arranged from bottom to top, the lower template 1 is movably arranged on the frame in a mode of sliding back and forth and moving up and down, the frame is provided with a lower lifting driving device for controlling the lower template to lift up and down and a lower translation driving device for controlling the lower template to move back and forth, the structure of the lower template 1 is the same as that of the lower template described in the forming process, namely, the upper surface of the lower template 1 is recessed with a forming cavity 11, the cavity bottom of the forming cavity 11 is provided with a negative pressure air inlet 111 for inflow of external negative pressure air, the forming cavity 11 is movably provided with a forming template which is identical to the shape of the mobile phone rear cover, the forming template is not accumulated any more, the periphery of the forming template is provided with a gap between the periphery of the forming template and the inner side wall of the forming cavity 11, the air inlet template is provided with a through hole 21 for enabling the air to flow into the forming cavity 11 to pass through the forming cavity 11, namely, the negative pressure plate is provided with a through hole 21 which is arranged in the upper cavity 11 and is correspondingly arranged in the forming cavity 2, namely, the forming cavity 11 is provided with a through hole which is formed in the forming cavity 2, and is formed through the forming cavity 2, and can be correspondingly arranged in the forming cavity 2, the heating plate 3 is mounted on the frame in a mode of moving back and forth, an upper translation driving device for driving the heating plate 3 to translate back and forth is mounted on the frame, the upper template 4 is fixedly mounted on the frame, the structure of the upper template 4 is the same as that of the upper template 4 described in the forming process, namely, a high-pressure air blowing hole 41 for blowing external high-pressure air is formed at the position of the lower bottom surface of the upper template 4 corresponding to the forming concave cavity 11.
The preferable scheme is as follows: the lower die plate 1, the material pressing plate 2, the heating plate 3 and the upper die plate 4 are square blocks, four forming concave cavities 11 are formed in the lower die plate 1, the four forming concave cavities 11 are arranged in two rows and two columns, four through holes are correspondingly formed, and the four forming concave cavities and the four through holes are arranged in a one-to-one opposite direction; the four forming concave cavities 11 enable the forming equipment to form four mobile phone rear covers at a time, so that the working efficiency is high.
Wherein the frame is provided with a side stand column 51, a lower hollow square frame 52, an upper hollow square frame 53 and a top frame 54, two side stand columns 51 are vertically arranged at the left side and the right side of the frame, the two side stand columns at the same side are arranged front and back, the lower hollow square frame 52 and the upper hollow square frame 53 are respectively positioned between the left side stand column 51 and the right side stand column 51 and are fixedly connected with the side stand columns at the two sides, the lower hollow square frame 52 is surrounded by four transverse connecting rods, the upper hollow square frame 53 is positioned above the lower hollow square frame 52, the lower hollow square frame 53 is a frame with an open front end and surrounded by a left connecting rod, a right connecting rod and a rear connecting rod, the top frame 54 is positioned at the top surfaces of the stand columns at the two sides and is fixedly connected with the side stand columns at the two sides, a sliding frame 55 along the front-back direction of the lower hollow square frame 52 is arranged in the hollow range of the lower hollow square frame 52, namely sliding rails for clamping transverse connecting rods at the left side and the right side of the lower hollow square frame into the sliding frame 55 are concavely arranged at two sides of the sliding frame 55, sliding installation of the sliding frame 55 can be realized by utilizing the sliding rails, the lower template 1 is horizontally arranged on the top surface of the sliding frame 55, a vertically arranged lower lifting cylinder 6 is arranged on the bottom surface of the sliding frame 55, a cylinder body of the lower lifting cylinder 6 is fixed on the bottom surface of the sliding frame 55, the free end part of a piston rod of the lower lifting cylinder 6 movably passes through the sliding frame 55 to the lower part of the lower template 1 and is fixedly connected with the bottom surface of the lower template 1, the lower lifting cylinder 6 is the lower lifting driving device, and when the lower lifting cylinder 6 stretches out, the lower template 1 can move upwards, and conversely, the lower lifting cylinder 6 can move downwards; the lower translation cylinder 7 horizontally arranged along the front-back direction of the frame is arranged on the lower hollow square frame 52, the cylinder body of the lower translation cylinder 7 is fixed outside the rear side surface of the lower hollow square frame 52, the free end part of the piston rod of the lower translation cylinder 7 extends into the lower hollow square frame 52 forwards and is fixedly connected with the rear side surface of the sliding frame 55, the lower translation cylinder 7 is a lower translation driving device, the extension of the lower translation cylinder 7 can be pushed to the sliding frame 55 to translate forwards, the lower template 1 can move forwards together by the forward movement of the sliding frame 55, and conversely, the sliding frame and the lower template move backwards together.
The machine frame is also provided with a guide upright post 56 positioned outside the left side and the right side of the pressing plate 2, the left side and the right side of the pressing plate 2 are respectively provided with a guide installation block 22 which is sleeved outside the guide upright post 56 in an outward protruding way, namely, the guide installation block 22 is provided with an installation perforation through which the guide upright post 56 is tightly matched to pass, the pressing plate 2 can move up and down along the guide upright post 56 in a guide way by utilizing the installation perforation, the upper lifting driving device comprises a screw rod 8 and a driving motor (not shown in the drawing) for driving the screw rod 8 to rotate, the screw rod 8 is vertically installed on the machine frame in a rotating way, the screw rod 8 passes through the guide installation block 22 on the right side of the pressing plate 2 and is in threaded connection with the guide installation block 22, namely, the guide installation block 22 is provided with an installation hole through which the screw rod 8 passes, the hole wall of the installation hole is provided with an internal thread which is in threaded connection with the external thread of the screw rod 8, the driving motor is fixed on the machine frame, and the driving motor is directly connected with the end part of the screw rod 8 in a driving way, and can also be in driving connection with the end part of the screw rod 8 through a driving mechanism. When the driving motor is started, the driving motor drives the screw rod 8 to rotate, and the guide mounting block 22 can move up and down along the screw rod 8 due to the rotation of the screw rod 8, so that the material pressing plate 2 moves up and down.
The heating plate 3 is an infrared heating plate, the heating plate 3 is arranged in a hollow cavity of the upper hollow square frame 53 in a front-back sliding manner, namely, guide sliding rails extending along the front-back direction are respectively arranged on the left inner side wall and the right inner side wall of the upper hollow square frame 53 in a protruding manner, a guide sliding block matched with the guide sliding rail is arranged on the bottom surface of the heating plate 3 in a protruding manner, the sliding installation of the heating plate 3 can be realized by utilizing the matching of the guide sliding rail and the guide sliding block, an upper translation air cylinder 9 which is positioned behind the heating plate 3 and horizontally arranged along the front-back direction of the frame is arranged on the upper hollow square frame 53, the cylinder body of the upper translation air cylinder 9 is fixed outside the rear side surface of the upper hollow square frame 53, and the free end part of a piston rod of the upper translation air cylinder 9 extends into the hollow cavity of the upper hollow square frame 53 and is fixedly matched with the rear side surface of the heating plate 3, and the upper translation air cylinder 9 is the upper translation driving device; the upper translation cylinder 9 stretches to push the heating plate 3 to slide back and forth.
The invention relates to a forming device of a 3D battery cover, which has the following working principle: the lower translation cylinder 7 extends forwards, the lower template 1 moves forwards to be staggered with the material pressing plate 2, moves to the front side of the lower hollow square frame, at the moment, no part is arranged above the lower template 1, the composite board for forming the mobile phone rear cover is placed on the upper surface of the lower template 1, and is positioned right above the forming concave cavity 11, the edge of the composite board is positioned outside the forming concave cavity 11, after the composite board is placed, the lower translation cylinder 7 contracts, the lower template 1 and the material pressing plate 2 are aligned vertically, the driving motor is started, the material pressing plate 2 moves downwards to be overlapped with the lower template 1, the part of the composite board outside the forming concave cavity is pressed by the material pressing plate 2, then the driving motor and the lower lifting cylinder 6 are started together, the upper translation cylinder 9 is started, the material pressing plate 2 and the lower template 1 move upwards together, the heating plate 3 moves forwards, and is aligned vertically with the material pressing plate 2 which moves upwards, the heating plate 3 stops moving, the material pressing plate 2 and the lower template 1 move upwards to be tightly overlapped with the heating plate 3 together, the heating plate 3 is started, the heating plate 3 heats the composite plate on the lower template 1, the composite plate is soft, external negative pressure gas flows into the forming concave cavity 11 through the negative pressure air inlet 111 when being heated, the heating plate 3 moves backwards after being heated for a certain time, the lower template 1 and the material pressing plate 2 continue to move upwards to be tightly overlapped with the upper template 4 together, external high pressure gas blows high pressure gas through the high pressure blowing hole 41, at the moment, the heated composite plate is deformed to the forming template in the forming concave cavity 11 under the suction of the negative pressure gas below and the pressure of the high pressure gas above, and is attached to the forming template, after forming, the material pressing plate 2 and the lower template 1 move downwards to be separated from the upper template 4, and then the lower template 1 moves relatively to the material pressing plate 2, the lower template 1 is separated from the material pressing plate 2, the lower template 1 moves forward and is misplaced with the material pressing plate 2, at the moment, a worker can take out the composite plate formed on the lower template 1, and finally, the rear cover of the mobile phone can be realized through post-treatment.
The forming equipment of the 3D battery cover has the following beneficial effects:
1. the pressing plate is utilized to ensure that the composite board can not run when in forming, and the forming effect is good and stable;
2. the compaction force, the heating softening, the lower negative pressure suction force and the upper high of the material pressing plate are adopted
The combination of the pressure blowing force enables the composite board to be deformed and molded, and no direct acting force is applied to the composite board
The surface of the composite board is not damaged by pressing, the forming quality is good, and the yield is high;
3. the limitation of the movement relation of the lower template, the material pressing plate, the heating plate and the upper template ensures that the material taking and placing operation of the forming equipment is simple and convenient;
4. has the advantages of simple integral structure, compact layout and convenient operation.
In the forming equipment, four positioning columns 112 are fixedly arranged on the upper surface of the lower die plate 1 corresponding to each forming concave cavity 11, and the four positioning columns 112 on each forming concave cavity 11 are correspondingly positioned outside four corners of the forming concave cavity 11; the four corners of the composite board are required to be provided with the positioning holes by the positioning columns 112, so that the composite board is placed more stably by the cooperation of the positioning holes and the positioning columns, and the composite board is not easily influenced by high-pressure gas and negative-pressure gas to deviate.
According to the forming equipment disclosed by the invention, the four corners of the upper surface of the lower die plate 1 are respectively provided with the positioning guide posts 12 in a standing manner, the positions of the material pressing plates 2 corresponding to the positioning guide posts 12 are provided with the guide perforations 23 for the positioning guide posts 12 to pass through in a one-to-one correspondence manner, and the lower die plate 1 and the material pressing plates 2 are overlapped by utilizing the matching of the positioning guide posts 12 and the guide perforations 23 to play a role in guiding and positioning.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (9)
1. The manufacturing process of the 3D battery cover is characterized by comprising the following steps of:
1. compounding the sheet material, namely compounding the PMMA film and the PC film together to form a composite board, wherein the thickness of the PMMA film is thinner than that of the PC film;
2. printing, namely printing a LOGO pattern printing layer on the bottom surface of the PC film by taking the surface of the PC film, which is opposite to the PMMA film, transferring a UV transfer texture pattern layer on the LOGO pattern printing layer through UV glue, electroplating an optical film layer on the UV transfer texture pattern layer, and finally printing a ground color ink layer on the optical film layer to form a sheet to be formed;
3. the sheet to be formed in the third step is placed on forming equipment for high-pressure forming, the forming equipment comprises a lower die plate, a material pressing plate, a heating plate and an upper die plate which are sequentially arranged from top to bottom, a forming cavity is recessed in the top surface of the lower die plate, a negative pressure air suction hole for inflow of external negative pressure air is formed in the cavity bottom of the forming cavity, a forming die plate which is matched with the shape of a mobile phone rear cover is placed in the forming cavity, an air inlet gap is formed between the forming die plate and the inner cavity wall of a forming cavity, a through hole which is matched with the forming cavity is formed in the material pressing plate in a position corresponding to the forming cavity in an aligned mode, and a high-pressure air blowing hole for inflow of external high pressure air is formed in the position of the upper die plate corresponding to the forming cavity; in the molding process, a sheet to be molded is firstly laid on a lower template, a molding cavity falls into the range of the sheet to be molded, then a pressing plate and the lower template move upwards, the pressing plate and the lower template are overlapped up and down, a heating plate and the pressing plate are overlapped up and down, the heating plate is started, the sheet to be molded is baked in an infrared heating mode, the baking temperature is 360-380 ℃, the baking time is 35-40 s, when the sheet to be molded is baked for 18-20 s, negative pressure air suction holes flow out of negative pressure air, the negative pressure of the negative pressure air is gradually increased, when the negative pressure of the negative pressure air reaches 38-49 Pa, the baking is carried out at a constant pressure, after the heating plate is removed from the upper template, the negative pressure air suction holes keep blowing out of the negative pressure air, the upper template and the pressing plate are overlapped up together, then the high pressure air is blown out of the high pressure air of the upper template, the high pressure output of the high pressure air is in a multi-stage type high pressure output with different pressure value, and finally, the part of the sheet to be molded at the position of the molding cavity is sucked into a room to be matched with the molding template, thus forming a semi-finished product, and the molding semi-finished product is demolding from molding equipment;
the multi-section high-pressure output is three-section high-pressure output, wherein the three-section high-pressure output is divided into a first section high-pressure output, a second section high-pressure output and a third section high-pressure output, the high-pressure gas pressure of the first section high-pressure output is 10-20 Mpa, and the output time is 0.5-1 s; the pressure of the high-pressure gas output by the second stage is 30-50 Mpa, and the output time is 0.5-1 s; the pressure of the high-pressure gas output by the third section is 80-100 Mpa, and the output time is 10-15 s;
4. spraying the UV hardening liquid on the top of the surface of the semi-finished product by using a pressure gun until the surface of the semi-finished product is fully covered with the UV hardening liquid, and drying to form a surface treatment piece;
5. and D, carrying out reverse side placement cutting on the surface treatment piece in the fourth step by adopting a CNC cutting machine to form a 3D battery cover finished product.
2. The process for manufacturing a 3D battery cover according to claim 1, wherein: and D, forming the UV hardening liquid on the surface of the finished product in the step four, wherein the thickness of the UV hardening liquid is 2um.
3. The process for manufacturing a 3D battery cover according to claim 1, wherein: the thickness ratio of the PMMA film to the PC film was 1:9.
4. a 3D battery cover molding apparatus for realizing the manufacturing process of the 3D battery cover according to any one of claims 1 to 3, characterized in that: the device comprises a frame, a lower template, a material pressing plate, a heating plate and an upper template are sequentially arranged on the frame from bottom to top, the lower template is movably arranged on the frame in a mode of sliding back and forth and moving up and down, a lower lifting driving device for controlling the lower template to lift up and down and a lower translation driving device for controlling the lower template to move back and forth are arranged on the frame, a forming cavity is concavely arranged on the upper surface of the lower template, a negative pressure air inlet hole for the outside negative pressure air to enter is formed in the cavity bottom of the forming cavity, a forming template which is matched with the shape of a mobile phone back cover is movably arranged in the forming cavity, an air inlet gap is formed between the peripheral edge of the forming template and the inner side wall of the forming cavity, the material pressing plate is arranged on the frame in a mode of lifting up and down, a penetrating through hole which is matched with the forming cavity is formed in the position of the forming cavity, the material pressing plate is arranged on the frame in a mode of moving back and forth, and the air pressing plate is arranged on the frame in a position corresponding to the forming cavity, and the air blowing device is arranged on the upper side of the forming cavity.
5. The molding apparatus of a 3D battery cover of claim 4, wherein: the lower die plate, the material pressing plate, the heating plate and the upper die plate are square blocks, four forming concave cavities are formed in the lower die plate and are arranged in two rows and two columns, four through holes are correspondingly formed in the four forming concave cavities, and the four forming concave cavities and the four through holes are arranged in a vertically aligned mode.
6. The molding apparatus of a 3D battery cover of claim 5, wherein: four positioning columns are fixedly arranged on the upper surface of the template corresponding to each molding concave cavity, and the four positioning columns on each molding concave cavity are correspondingly positioned outside four corners of the molding concave cavity.
7. The molding apparatus of a 3D battery cover of claim 4, wherein: the heating plate is an infrared heating plate.
8. The molding apparatus of a 3D battery cover of claim 4, wherein: the frame is provided with side posts positioned on the left side and the right side, a lower hollow square frame positioned between the side posts on the two sides and fixed with the side posts, an upper hollow square frame positioned between the side posts on the two sides and positioned above the hollow square frame body, and a top frame positioned on the top surfaces of the side posts on the two sides and fixedly connected with the side posts; a sliding frame along the front-back direction of the lower hollow square frame is arranged in the hollow range of the lower hollow square frame, the lower template is arranged above the sliding frame, a vertically arranged lower lifting cylinder is arranged on the bottom surface of the sliding frame, the free end part of a piston rod of the lower lifting cylinder movably penetrates through the sliding frame to be fixedly connected with the lower template, the lower lifting cylinder is a lower lifting driving device, a lower translation cylinder horizontally arranged along the front-back direction of the frame is arranged on the lower hollow square frame, the lower translation cylinder is positioned behind the sliding frame, the free end part of the piston rod of the lower translation cylinder is fixedly connected with the rear side surface of the sliding frame, and the lower translation cylinder is the lower translation driving device; the frame is also provided with guide upright posts positioned outside the left side and the right side of the pressing plate, the left side and the right side of the pressing plate are respectively provided with guide mounting blocks sleeved outside the guide upright posts in a protruding mode, the upper lifting driving device comprises a screw rod and a driving motor for driving the screw rod to rotate, the screw rod is vertically arranged and penetrates through the guide mounting blocks on the left side or the right side of the pressing plate, and the guide mounting blocks are in threaded connection with the screw rod; the heating plate is arranged in the hollow cavity of the upper hollow square frame in a front-back sliding mode, an upper translation cylinder which is positioned behind the heating plate and horizontally arranged along the front-back direction of the frame is arranged on the upper hollow square frame, the free end part of a piston rod of the upper translation cylinder is fixedly matched with the rear side surface of the heating plate, and the upper translation cylinder is the upper translation driving device.
9. The molding apparatus of a 3D battery cover of claim 4, wherein: positioning guide posts are respectively erected at four corners of the upper surface of the lower die plate, and guide perforations through which the positioning guide posts pass are correspondingly formed at the positions of the pressing plate corresponding to the positioning guide posts one by one.
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| CN109454858B (en) * | 2018-11-27 | 2024-04-19 | 江苏理士电池有限公司 | Battery cover shaping through hole device |
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| CN111816810B (en) * | 2020-07-17 | 2022-05-24 | 鑫和(东莞)板材有限公司 | Flash sand process for composite board of mobile phone battery cover |
| CN112549399A (en) * | 2020-12-04 | 2021-03-26 | 深圳市中联讯科技有限公司 | High-pressure forming process for battery cover |
| CN113022181A (en) * | 2021-02-01 | 2021-06-25 | 惠州威博精密科技有限公司 | 3D composite board printing process |
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