CN111547992A

CN111547992A - Hot bending die, cover plate, manufacturing method of cover plate and mobile terminal

Info

Publication number: CN111547992A
Application number: CN202010285181.2A
Authority: CN
Inventors: 易伟华; 张迅; 匡剑胜; 林应杰
Original assignee: WG Tech Jiangxi Co Ltd
Current assignee: WG Tech Jiangxi Co Ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-08-18
Anticipated expiration: 2040-04-13
Also published as: CN111547992B

Abstract

The invention relates to a hot bending die, a cover plate, a manufacturing method of the cover plate and a mobile terminal. The hot bending die comprises an upper die plate, a lower die plate, a shovel base, a sliding block and an insert block. The upper template is provided with a through groove, the bottom surface of the upper template is provided with a containing groove, and the through groove and the containing groove are arranged at intervals. The top surface of lower bolster is seted up and is held the chamber, and during the compound die, the top surface of lower bolster and the bottom surface laminating of cope match-plate pattern. The shovel base is movably arranged in the through groove and can extend into the containing cavity, and the bottom end of the shovel base is provided with a pushing surface. The slider activity is placed in holding the intracavity, and one side of slider is equipped with the guide face with the face matched with that pushes away of shovel base, and the opposite side of slider is equipped with the concave cambered surface. The insert is fixedly placed in the containing cavity, the insert and the sliding block are arranged at intervals, the insert is provided with a processing platform, the processing platform is arranged in the containing groove during die assembly, and a convex cambered surface matched with the concave cambered surface is arranged on one side, facing the sliding block, of the processing platform. The hot bending die can process a bent workpiece with any angle of 0-180 degrees.

Description

Hot bending die, cover plate, manufacturing method of cover plate and mobile terminal

Technical Field

The invention relates to the field of glass cover plate preparation, in particular to a hot bending die, a cover plate, a preparation method of the cover plate and a mobile terminal.

Background

Along with the development and progress of science and technology, mobile terminals such as smart mobile phones, flat boards develop towards 3D by 2D gradually, and correspondingly, mobile terminal's protection protecgulum also develops towards 3D by 2D gradually with the back lid. At present, the 3D glass forming method is mainly divided into two types: one is cold engraving and the other is hot bending. The cold engraving process is to remove the expectation from a whole piece of 2D glass by using a CNC grinding head, so that 3D glass with various arc-edge curvatures can be realized, but the cold engraving process has long time, low efficiency, short service life of the CNC grinding head and quite rough CNC processing position; the hot bending 3D glass is formed by softening 2D glass at a high temperature and then molding the glass with a mold to obtain 3D glass, but the existing mold can only process 3D glass with a bending angle of less than 85 °.

Disclosure of Invention

In view of the above, there is a need for a cover plate with a larger bending angle and a method for manufacturing the same.

In addition, a hot bending die for preparing the cover plate and a mobile terminal comprising the cover plate are also provided.

A hot-bending die comprising:

the upper template is provided with a through groove penetrating through the upper template, the bottom surface of the upper template is provided with a containing groove for placing a workpiece to be bent, and the through groove and the containing groove are arranged at intervals;

the top surface of the lower template is provided with an accommodating cavity, and the top surface of the lower template is attached to the bottom surface of the upper template during die assembly;

the shovel base is movably arranged in the through groove and can extend into the accommodating cavity, and the bottom end of the shovel base is provided with a pushing surface;

the sliding block is movably arranged in the accommodating cavity, one side of the sliding block is provided with a guide surface matched with the pushing surface of the shovel base, and the other side of the sliding block is provided with a concave arc surface; and

the insert is fixedly arranged in the containing cavity, the insert and the sliding block are arranged at intervals, the insert is provided with a processing platform, when the die is closed, the processing platform is arranged in the containing groove, and a convex cambered surface matched with the concave cambered surface is arranged on one side, facing the sliding block, of the processing platform.

In the hot bending die, a workpiece to be processed is placed on a processing platform, an upper die plate and a lower die plate are closed, the bottom surface of the lower die plate is attached to the bottom surface of the upper die plate during die closing, the workpiece to be processed is bent to 90 degrees by downwards pressing the upper die plate through a containing groove in the upper die plate, then a shovel base is downwards moved, and because a guide surface matched with a pushing surface on the shovel base is arranged on a sliding block, the downward moving shovel base can drive the sliding block to horizontally move, finally, a concave arc surface on the sliding block is matched with a convex arc surface of the processing platform on an insert block, and the workpiece to be processed is hot bent to 180 degrees. And moreover, a bent workpiece of 0-90 degrees can be processed by controlling the force for pressing the upper template downwards, and a bent workpiece of 90-180 degrees can be processed by moving the distance between the first shovel base and the second shovel base downwards. Therefore, the hot bending die can be used for processing bent workpieces with any angle of 0-180 degrees.

In one embodiment, the through grooves include a first through groove and a second through groove, and the first through groove and the second through groove are respectively located at two sides of the accommodating groove;

the shovel base comprises a first shovel base and a second shovel base, the first shovel base is movably arranged in the first through groove, a first abutting surface is arranged at the bottom end of the first shovel base, the second shovel base is movably arranged in the second through groove, and a second abutting surface is arranged at the bottom end of the second shovel base;

the sliding block comprises a first sliding block and a second sliding block, the first sliding block and the second sliding block are movably placed in the accommodating cavity, a first guide surface matched with the first abutting surface is arranged on one side of the first sliding block, a first concave arc surface is arranged on the other side of the first sliding block, a second guide surface matched with the second abutting surface is arranged on one side of the second sliding block, and a second concave arc surface is arranged on the other side of the second sliding block;

one side of the processing platform, which faces the first sliding block, is provided with a first convex arc surface matched with the first concave arc surface, and one side of the processing platform, which faces the second sliding block, is provided with a second convex arc surface matched with the second concave arc surface. At the moment, the hot bending die can simultaneously hot bend two side edges of the workpiece to be processed to 90 degrees.

In one embodiment, the through groove is a T-shaped groove, and the shovel base is a T-shaped block matched with the through groove. The T-shaped groove can limit the shovel base in a T-shaped block shape and place the shovel base to move downwards in the through groove.

In one embodiment, at least one forming column is arranged on one side of the shovel base, which is far away from the lower template.

In one embodiment, the inner wall of the accommodating cavity is provided with a positioning groove, and the insert is provided with a hanging table matched with the positioning groove. The locating groove enables the insert to be fixed at an accurate position, so that errors of the placing position of a machined workpiece caused by inaccuracy of the fixing position of the insert are avoided, and defective products of the machined workpiece are reduced.

In one embodiment, the inner wall of the accommodating cavity extends inwards to form a positioning block for positioning the sliding block and/or the insert.

In one embodiment, the positioning block is provided in a plurality and is arranged at each corner of the accommodating cavity, and each positioning block has two adjacent surfaces, wherein one surface is used for abutting against the insert, and the other surface is used for orienting the sliding block.

In one embodiment, the device further comprises a pressing plate, wherein the pressing plate is arranged on the top surface of the upper template and is spaced from the through groove. The pressing plate is pressed on the upper template, pressure is applied to the upper template, so that the gap between the upper template and the lower template can be reduced when the upper template and the lower template are assembled, and the excellent rate of processed workpieces is improved. In addition, the pressing plate is made of tungsten steel material. The tungsten steel still has high hardness, strength, toughness and excellent wear resistance under high temperature, and the cost can be reduced to a certain extent.

In one embodiment, the side wall of the containing groove is correspondingly formed into a concave matching surface towards the convex cambered surface of the processing platform, and the shape of the surface formed by connecting the concave matching surface with the concave cambered surface of the slide block is completely matched with the convex cambered surface when the mold is closed.

In one embodiment, when the die is closed, the top surface of the slide block is connected with the bottom surface of the upper die plate, and the top surface of the slide block and the tangent point of the vertical tangent line of the convex arc surface of the processing platform are on the same horizontal plane.

A method of making a cover plate comprising:

s1, providing the hot bending mold and the substrate;

s2, heating the hot bending die and the substrate, and closing the upper template and the lower template to obtain the substrate with a hot bending angle of 90 degrees;

and S3, pushing the shovel base, mutually matching the pushing surface on the shovel base and the guide surface on the sliding block to drive the sliding block to move, further hot bending the substrate with the hot bending angle of 90 degrees by the moving sliding block, and finally matching the concave arc surface on the sliding block with the convex arc surface on the processing platform to obtain the substrate with the hot bending angle of more than 90 degrees.

The cover plate with the bending angle of 180 degrees is processed by the preparation method.

A mobile terminal comprises the cover plate.

Drawings

FIG. 1 is an exploded view of a hot-bending die according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a hot-bending mold according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of an upper mold plate of a hot bending mold according to an embodiment of the present invention;

FIG. 4 is a schematic perspective view of an alternative angle of an upper platen of a hot-bending mold according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a lower mold plate of a hot bending mold according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a first shovel base of the hot bending mold according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a second shovel base of the hot bending mold according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of a first slide block of the hot bending die according to an embodiment of the present invention;

fig. 9 is a perspective view of a second slide block of the hot bending die according to an embodiment of the present invention;

FIG. 10 is a schematic perspective view of an insert for a hot bending die according to an embodiment of the present invention;

fig. 11 is a perspective view of the assembled hot bending mold according to an embodiment of the present invention;

FIG. 12 is a flow chart of a method of making a cover plate according to one embodiment of the present invention;

FIG. 13 is a cross-sectional view of a hot bending die for hot bending a substrate to a bend angle of 90 according to one embodiment of the present invention;

FIG. 14 is a cross-sectional view of a hot-bending die for hot-bending a substrate to a bend angle of 180 in accordance with one embodiment of the present invention;

fig. 15 is a partially enlarged view of a region a in the hot-bending die shown in fig. 14.

1-upper template; 11-a through slot; 111-a first through slot; 112-a second through slot; 12-upper template bottom surface; 121-a receiving groove; 122-a female mating surface; 13-upper template top surface; 2-a lower template; 21-lower template top surface; 211-a containment chamber; 212-a first receiving cavity; 213-a second receiving chamber; 214-a third receiving chamber; 215-locating block; 216-an orientation plane; 217-positioning surface; 2111-locating slot; 3-shovel base; 30-pushing surface; 301-a first pushing surface; 302 a second pushing surface; 310-a first scoop base; 320-a second shovel base; 4-a slide block; 40-a guiding surface; 401-a first guiding surface; 402-a second guide face; 41-concave arc surface; 411-a first concave arc surface; 412-a second concave arc; 410-a first slider; 411-a first boss; 420-a second slider; 421-a second boss; 5-an insert; 50-convex arc surface; 501 a first convex arc surface; 502-second convexly curved surface; 51-hanging table; 510-a processing platform; 6-forming a column; 7-pressing a plate; 8-substrate.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a hot bending die for processing a base plate 8 as a workpiece to be hot bent to form a cover plate includes an upper die plate 1, a lower die plate 2, a shovel base 3, a slider 4 and an insert 5. Referring to fig. 3 and 4, the upper plate 1 is provided with a first through groove 111 and a second through groove 112 penetrating through the upper plate top surface 13 and the upper plate bottom surface 12, the first through groove 111 and the second through groove 112 are both "T" shaped grooves, the upper plate bottom surface 12 is provided with a containing groove 121 for containing the substrate 8, the containing groove 121 is a square groove and is located between the first through groove 111 and the second through groove 112, and two opposite sides of the containing groove 121 are parallel to the extending directions of the first through groove 111 and the second through groove 112. In addition, the receiving groove 121 penetrates the front and rear surfaces of the upper plate 1. It is understood that, when two through slots 11 are formed in the upper mold plate 1, two sides of the substrate 8 can be bent, and in other embodiments, the number of the through slots 11 may also be one, and the through slots 11 are disposed on one side of the accommodating slot 121 and spaced apart from the accommodating slot 121, at this time, the hot bending mold can only bend one side of the substrate 8. In addition, when two through grooves 11 are provided, the two through grooves 11 may be disposed on two opposite sides of the accommodating groove 121, or may be disposed on two adjacent sides of the accommodating groove 121, so as to bend two opposite sides or two adjacent sides of the substrate 8.

Referring to fig. 5, the lower mold plate 2 is provided with an accommodating cavity 211 penetrating through the top surface 21 of the lower mold plate and the bottom surface of the lower mold plate, the accommodating cavity 211 is divided into three parts, namely a first accommodating cavity 212, a second accommodating cavity 213 and a third accommodating cavity 214, the first accommodating cavity 212 is a left part of the accommodating cavity 211 in fig. 5, the second accommodating cavity 213 is a middle part of the accommodating cavity 211, and the third accommodating cavity 214 is a right part of the accommodating cavity 211. A positioning block 215 is formed by extending the front and rear inner walls of the lower end of the first accommodating cavity; the front and rear inner walls of the upper end of the second receiving chamber 213 are recessed inward to form a positioning groove 2111; a positioning block 215 is formed at the front and rear inner walls of the lower end of the third receiving chamber 214. At this time, four positioning blocks 215 are arranged, the four positioning blocks 215 are distributed at four corners of the accommodating cavity 211, and the positioning blocks 215 are used for positioning the slider 4 and the insert 5.

Further, each positioning block 215 has adjacent orientation surfaces 216 and 217, the orientation surfaces 216 being used to orient the sliding of the slide 4, and the positioning surfaces 217 being used to abut against the insert 5, limiting the insert 5. Of course, in other embodiments, the positioning blocks 215 may be provided in other numbers. In other embodiments, the receiving cavity 211 may not extend through the top surface 21 of the lower plate and the bottom surface of the lower plate, but may be formed only on the top surface 21 of the lower plate.

Referring to fig. 6 and 7 together, the shovel base 3 includes a first shovel base 310 and a second shovel base 320, the first shovel base 310 is placed in the first through groove 111, the first shovel base 310 can move up and down in the first through groove 111, and the first shovel base 310 is shaped like a "T" that matches the first through groove 111, and the height of the first shovel base 310 is higher than that of the upper template 1. In addition, a first abutting surface 301 which inclines downwards from right to left is formed at one end of the first shovel base 310 close to the lower template 2. The second shovel base 320 is placed in the second through groove 112, the second shovel base 320 can move up and down in the second through groove 112, the shape of the second shovel base 320 is a 'T' shape matched with the second through groove 112, the height of the second shovel base 320 is higher than that of the upper template 1, a second abutting surface 302 inclining downwards from left to right is formed at one end, close to the lower template 2, of the second shovel base 320, and the height of the first shovel base 310 is consistent with that of the second shovel base 320.

Referring to fig. 8 and 9, the slider 4 includes a first slider 410 and a second slider 420, the first slider 410 is placed in the first accommodating cavity 212, and first bosses 411 engaged with the positioning blocks 215 in the first accommodating cavity 212 are disposed at opposite sides of the first slider 410. The first slider 410 can slide left and right in the first accommodating cavity 212, and when the first slider 410 slides in the first accommodating cavity 212, the first boss 411 abuts against the orientation surface 216 of the positioning block 215. The left side of the first slider 410, which faces away from the lower template 2, is formed with a first guide surface 401 which inclines upward from left to right, and the first guide surface 401 is matched with the first abutting surface 301 on the first shovel base 310. And a first concave arc surface 411 is concavely formed at the right side of the upper end of the first slider 410. The second slider 420 is placed in the third accommodating cavity 214, and the two opposite sides of the second slider 420 away from the lower template 2 are provided with second bosses 421 matched with the positioning blocks 215 in the third accommodating cavity. The second slider 420 can slide left and right in the third accommodating cavity, and when the second slider 420 slides in the third accommodating cavity 214, the second boss 421 abuts against the orientation surface 216 of the positioning block 215. The right side of one end of the second slider 420, which is away from the lower template 2, is a second guide surface 402 which inclines upwards from right to left, the second guide surface 402 is matched with the second pushing surface 302 on the second shovel base 320, and the left side of the upper end of the second slider 420 is provided with a second concave arc surface 412. Of course, in other embodiments, the orientation surface 216 of the positioning block 215 may further have a downward sliding slot, in which the first protrusion 411 and the second protrusion 421 slide in the sliding slot formed by the orientation surface 216, and the shape of the sliding slot may be any one of a "straight" shape, an "L" shape, a "T" shape, a "dovetail" shape, and the like.

Referring to fig. 10, the insert 5 is inserted into the second receiving cavity 213, the bottom surface of the insert 5 is flush with the bottom surface of the lower die plate 2, a processing platform 510 is arranged at one end of the insert 5 close to the upper die plate 1, and the processing platform 510 is integrally formed with the insert 5. In addition, the height 1/2 of processing platform 510 is higher than the top surface 21 of the lower mold plate, and the portion 1/2 higher than the top surface 21 of the lower mold plate matches the shape of receiving slot 121 on the upper mold plate 1. A first convex arc surface 501 is arranged on one side, close to the first slider 410, of the processing platform 510, and the first convex arc surface 501 is matched with a first concave arc surface 411 on the first slider 410; a second convex arc surface 502 is arranged on one side of the processing platform 510 close to the second slider 420, and the second convex arc surface 502 is matched with the second concave arc surface 412 on the second slider 420. In addition, the front side and the rear side of the upper end of the insert 5 are respectively provided with a hanging platform 51, the hanging platforms 51 are embedded into the positioning grooves 2111 in the second accommodating cavity 213, and the shapes of the hanging platforms 51 are matched with the positioning grooves 2111.

In some embodiments, referring to fig. 11, two cylindrical shaped pillars 6 are further disposed above the first shovel base 310, after the shaped pillars 6 are pushed, the shaped pillars 6 push the first shovel base 310 downward, and the first shovel base 310 moves downward under the push of the shaped pillars 6; two cylindrical forming pillars 6 are also provided above the same second scooping base 320, and the second scooping base 320 is also moved downward by the urging of the forming pillars 6. The forming columns 6 are arranged above the first shovel base 310 and the second shovel base 320, so that errors caused by incomplete matching of the first concave arc surface 411 and the second concave arc surface 412 with the first convex arc surface 501 and the second convex arc surface 502 on the processing platform 510 due to the fact that the first shovel base 310 and the second shovel base 320 are directly pushed and pressed are avoided. In other embodiments, the forming columns 6 may be arranged in several numbers of one, three, four, five, etc., and the forming columns 6 may also be square or hexagonal, etc.

In some embodiments, a pressing plate 7 is placed on the top surface 13 of the upper template, the pressing plate 7 is a square plate, and a circular column is fixed at one end of the pressing plate 7, which is far away from the upper template 1. And, the clamp plate 7 has certain weight, can exert the effort to cope match-plate pattern 1, and the gap when pressing clamp plate 7 on cope match-plate pattern top surface 1 can reduce cope match-plate pattern 1 and lower bolster 2 compound die. The pressing plate 7 made of tungsten steel has high hardness, strength and excellent wear resistance under high temperature conditions, and is not easy to deform, so that the tungsten steel plate can be repeatedly used even if the tungsten steel plate works under the high temperature conditions, and the processing cost can be reduced. In other embodiments, the shape of the pressing plate 7 may be any suitable shape such as a circle, an ellipse, or a polygon, the pillar above the pressing plate 7 may be some common regular shape such as a square, and the pillar may not be fixed on the pressing plate 7.

In one embodiment, the hot bending die is made of graphite, that is, the upper die plate 1, the lower die plate 2, the first shovel base 310, the second shovel base 320, the first slider 410, the second slider 420, the insert 5, the processing platform 510, and the hanging table 51 are made of graphite. The temperature of glass hot bending molding is about 760 degrees, the glass belongs to high temperature, and under the high temperature condition, the graphite has small thermal expansion coefficient, small deformation and high strength, and is very suitable for working under the high temperature condition.

The hot bending die is particularly suitable for preparing the mobile terminal cover plate with the bending angle of 180 degrees. By adopting the hot bending die, the cover plate with the bending angle of 180 degrees can be prepared under the hot bending process. In addition, the bending angle can be selected to prepare a cover plate with any angle within a range of 0-90 degrees by controlling the mold clamping force when the upper mold plate 1 and the lower mold plate 2 are clamped; after the upper template 1 and the lower template 2 are perfectly matched to bend the substrate 8 to 90 degrees, the cover plate with any angle between 90 degrees and 180 degrees is prepared by controlling the downward movement distance of the first shovel base 310 and the second shovel base 320.

A method of manufacturing a cover plate according to an embodiment, referring to fig. 2 and 12, includes:

s1, providing the hot bending mold of the above embodiment, and a glass substrate 8.

In step S1, the glass substrate 8 needs to be pretreated first. Specifically, the substrate 8 is first processed into a suitable size by cutting, then the substrate 8 is further carved and molded by computer numerical control processing, then the surface of the substrate 8 is smoothed and smoothed by grinding and polishing, and finally, dust and other stains generated by cutting, computer numerical control processing and grinding and polishing on the surface of the substrate 8 are removed by cleaning, so that the high-quality substrate 8 which is smoothed and smooth and has a clean and pollution-free surface is obtained.

S2, the glass substrate 8 pretreated in step S1 is placed on the processing stage 510, and the hot-bending mold and the substrate 8 are heated. Referring to fig. 13, when the heating temperature reaches the softening temperature of the glass substrate 8, a mold clamping force is applied to the upper mold plate 1, so that the upper mold plate 1 and the lower mold plate 2 are clamped, and at this time, portions of the upper mold plate 1 located at two sides of the accommodating groove 121 are pressed against the substrate 8, so that the substrate 8 is bent downward along the convex arc surface 50. Further, when the upper die plate bottom surface 12 and the lower die plate top surface 21 are bonded, the substrate 8 having a 90 ° hot bend angle can be obtained. In other embodiments, the mold clamping force may be applied to the lower mold plate 2, or the mold clamping force may be applied to both the upper mold plate 1 and the lower mold plate 2.

S3, referring to fig. 14, after the substrate 8 with the bending angle of 90 ° in step S2 is obtained, the forming column 6 pushes the first shovel base 310 and the second shovel base 320 to move toward the lower mold plate 2. The first abutting surface 301 of the first shovel base 310 is matched with the first guide surface 401 of the first slider 410, and when the first shovel base 310 is pushed downward, the first abutting surface 301 applies an acting force to the first slider, so that the first slider 410 moves toward the direction close to the insert 5, and further abuts against the substrate 8, and the bending angle of the substrate 8 is increased. When the first slider 410 moves to the position where the first concave arc surface 411 on the first slider 410 is tightly attached to the first convex arc surface 501 on the processing platform 510, at this time, the side of the glass substrate 8 close to the first slider 410 can be processed and thermally bent to form a 180-degree bend. The second pushing surface 302 of the second shovel base 320 cooperates with the second guiding surface 402 of the second slider 420 to push the second shovel base 320 downward, so as to drive the second slider 420 to move rightward, and when the second slider 420 moves to a position where the second concave arc surface 412 of the second slider 420 is tightly attached to the second convex arc surface 502 of the processing platform 510, at this time, the right side of the glass substrate 8 is processed and thermally bent to 180 °.

In addition, referring to fig. 13, it can be understood that, after the base plate 8 is clamped to form the base plate 8 with a bending angle of 90 °, the bottom end of the bent portion of the base plate 8, i.e., the end portion of the base plate 8 closest to the bottom surface of the lower die plate 2, is lower than the concave arc surface 41 of the slider 4, i.e., a portion of the base plate 8 in the vertical direction is opposite to the vertical surface of the slider 4 facing the insert 5. Therefore, when the slider 4 moves towards the insert 5, the vertical surface of the slider 4 facing the insert 5 is firstly contacted with the base plate 8, and then the part of the base plate 8 close to the bottom surface of the lower template 2 is pressed towards the direction of the attaching convex arc surface 50. And, during the extrusion process, the part of the base plate 8 close to the bottom surface of the lower template 5 gradually slides into the groove body formed by the concave arc surface 41. And referring to fig. 15, when the slider 4 is moved to the position where the vertical surface of the slider 4 facing the insert 5 abuts against the insert 5, both sides of the curved portion of the base plate 8 completely abut against the convex arc surface 50 and the concave arc surface 41.

Of course, the thermal bending of the glass substrate 8 is performed under a high temperature condition, so that the first shovel base 310 and the second shovel base 320 are pushed to move downward by applying a downward force to the first shovel base 310 and the second shovel base 320 at the same time through a machine. It will be appreciated that the closer the slide 4 is to the insert 5, the greater the bending angle of the base plate 8, whereas in the embodiment of figure 14, the slide 4 abuts the insert 5 and the bending angle of the base plate 8 reaches a maximum of 180 °.

Further, referring to fig. 15 together, in some embodiments, the side wall of the containing groove is formed with a concave mating surface 122 corresponding to the convex arc surface 50 of the processing platform 510, and in the process bending of the base plate 8, when the slide block 4 abuts against the insert 5, the shape of the surface formed by the concave mating surface 122 and the concave arc surface 41 of the slide block 4 is completely matched with the convex arc surface 50. It will be appreciated that in clamping, when the substrate 8 is simultaneously engaged with the concave mating face 122 and a portion of the convex arc face 50, the substrate 8 is bent at an angle of 90 °. When the slide 4 is moved into abutment with the insert 5, i.e. the concave mating surface 122 is connected with the concave arc surface 41 to form a surface perfectly matching the convex arc surface 50, the bending angle of the base plate 8 reaches 180 °. In addition, in the embodiment shown in fig. 15, the surface of the slide 4 facing the upper die plate 1, i.e., the top surface of the slide 4, is lower than the tangent point of the vertical tangent to the convexly curved surface 50. In other embodiments, the top surface of the slider 4 is connected to the bottom surface 12 of the upper mold plate, and the top surface of the slider 4 is in the same horizontal plane as the tangent point of the vertical tangent to the convex arc surface 41, thereby enabling more precise control of the bending angle of the substrate 8 during bending.

And S4, after the glass substrate 8 with the bending angle of 180 degrees is manufactured through the hot bending in the step S3, cooling the hot bending die, demolding the upper die plate 1 and the lower die plate 2 after the hot bending die is cooled to the room temperature, taking down the glass substrate 8 with the bending angle of 180 degrees from the processing platform 510 after demolding, polishing and cleaning the taken-down glass substrate 8 with the bending angle of 180 degrees, and obtaining the cover plate with the bending angle of 180 degrees.

The polishing is to remove a mold mark generated when the glass substrate 8 is pressed when the upper mold plate 1 and the lower mold plate 2 are closed. The cleaning is for removing the polishing powder adsorbed on the glass substrate 8.

The cover plate with the bending angle of 180 degrees is prepared by the method.

A mobile terminal (not shown) includes the cover plate with the bending angle of 180 °. In particular, in some embodiments, the mobile terminal may be an electronic device such as a smartphone, a tablet, an e-reader, and when the mobile terminal is a smartphone, the cover may be a glass protective cover of the mobile terminal.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A hot-bending die, comprising:

2. A hot-bending die according to claim 1, wherein the through grooves include a first through groove and a second through groove, the first through groove and the second through groove being located on both sides of the accommodating groove, respectively;

one side of the processing platform, which faces the first sliding block, is provided with a first convex arc surface matched with the first concave arc surface, and one side of the processing platform, which faces the second sliding block, is provided with a second convex arc surface matched with the second concave arc surface.

3. The hot-bending die according to claim 1, wherein the through groove is a T-shaped groove, and the shovel base is a T-shaped block matched with the through groove.

4. The hot-bending die according to claim 1, wherein at least one forming column is arranged on the side of the shovel base, which faces away from the lower die plate.

5. A hot-bending die according to claim 1, wherein the inner wall of the accommodating cavity is provided with a positioning groove, and the insert is provided with a hanging platform matched with the positioning groove.

6. A hot-bending die according to claim 1, wherein the inner wall of the receiving cavity extends inwardly to form a locating block for locating the slide and/or the insert.

7. A hot-bending die according to claim 6, wherein the locating blocks are plural and are arranged at respective corners of the receiving cavity, each locating block having two adjacent faces, one of which is adapted to abut the insert and the other of which is adapted to orient the slide.

8. The mold of claim 1, further comprising a platen disposed on a top surface of the upper platen and spaced from the through slots.

9. The hot-bending die according to claim 1, wherein the side wall of the accommodating groove correspondingly forms a concave mating surface towards the convex cambered surface of the processing platform, and when the die is closed, the shape of the surface formed by connecting the concave mating surface with the concave cambered surface of the sliding block is completely matched with the shape of the convex cambered surface.

10. The hot-bending die according to claim 1, wherein when the dies are closed, the top surface of the slide block is connected with the bottom surface of the upper die plate, and the tangent point of the top surface of the slide block and the vertical tangent line of the convex arc surface of the processing platform are on the same horizontal plane.

11. A method of making a cover plate, comprising:

providing a hot-bending mould according to any one of claims 1-10 and a substrate;

heating the hot bending die and the substrate, and closing the upper template and the lower template to obtain the substrate with a hot bending angle of 90 degrees;

promote the shovel base, through supporting on the shovel base and pushing away the face and the guide face on the slider mutually support, drive the slider and remove, the slider that removes is further hot-bent to the base plate that the angle of hot bending is 90, finally to the concave cambered surface on the slider with the last convex cambered surface of processing platform cooperatees, obtains the base plate that the angle of hot bending is greater than 90.

12. A cover plate, characterized by being manufactured by the manufacturing method of claim 11, and having a bending angle of 180 °.

13. A mobile terminal characterized by comprising the cover plate of claim 12.