CN106430924B

CN106430924B - Hot bending die

Info

Publication number: CN106430924B
Application number: CN201610845695.2A
Authority: CN
Inventors: 黄红伍; 逯正旺; 赵学军; 廖继勇
Original assignee: Kaymao Technology Shenzhen Ltd
Current assignee: Kaimao Technology Fujian Co ltd
Priority date: 2016-09-22
Filing date: 2016-09-22
Publication date: 2021-05-11
Anticipated expiration: 2036-09-22
Also published as: CN106430924A

Abstract

The invention provides a hot bending die, which is used for hot bending the edge of a glass cover plate and comprises a lower die and a bearing piece, wherein the lower die comprises a base body, the base body comprises a bottom plate and side plates, an accommodating space is formed between the bottom plate and the side plates, the bearing piece is placed in the accommodating space and is used for bearing the glass cover plate to be processed, the size of the bearing piece in one direction is smaller than that of the accommodating space in the same direction so as to form a gap between two opposite side edges of the bearing piece in the direction and the side plates on two sides of the corresponding accommodating space, and convection holes penetrating through the base body are formed on the side plates on two sides of the accommodating space corresponding to the gap. Due to the arrangement of the convection holes, the part of the glass cover plate to be thermally bent is rapidly heated to reach the softening temperature, and the softened part of the glass cover plate to be thermally bent is pressed and deformed to form the required 3D glass. The air heat convection at the position where the glass cover plate needs to be bent is accelerated, the glass cover plate is quickly softened, the time required by the hot bending is saved, and the hot bending efficiency of the glass cover plate is improved.

Description

Hot bending die

Technical Field

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

Background

The glass cover plate is the protective glass, and with the upgrading of product requirements, the market has higher and higher requirements for the glass screen. At present, the market generally divides the glass dry plate into a flat glass cover plate and a non-flat glass cover plate, wherein the middle area of the non-flat glass cover plate can be a flat surface or a cambered surface, and the edge part of the glass cover plate adopts cambered surface transition. The non-planar glass cover plate has the advantages that the appearance attractiveness of the mobile phone is greatly improved, the experience of a user in screen touch operation is improved, the non-planar glass cover plate is more and more widely applied, and higher requirements are also provided for the processing technology of the glass cover plate.

The conventional non-planar glass cover plate is generally prepared in a cold machining mode, the edge of planar glass is ground and polished to obtain an arc surface edge, fine cracks appear on the non-planar glass cover plate obtained through machining easily due to the cold machining preparation mode, and the yield and the preparation efficiency of the glass cover plate are greatly influenced.

Disclosure of Invention

In order to overcome the defects of the existing non-planar glass cover plate preparation, the invention provides a hot bending die.

The technical scheme for solving the technical problems is to provide

The utility model provides a hot-bending die for the edge of hot-bending glass apron, includes lower mould and holds carrier, the lower mould includes the base member, and the base member includes bottom plate and curb plate, forms an accommodation space between bottom plate and the curb plate, holds carrier and places in this accommodation space for hold and wait to process the glass apron, the curb plate is located the relative both sides of base member correspond with the part that waits to process glass and need hot-bending, is provided with the arcwall face on the curb plate, the arcwall face corresponds the relative both sides limit setting of carrier, hold carrier size in one direction and be less than this accommodation space size in order to hold carrier in this direction relative both sides limit and the curb plate of the both sides of the accommodation space that corresponds between the carrier, set up on the arcwall face and run through the convection hole of base member, the clearance size is 0.5-2 mm.

Preferably, the bending radian of the arc-shaped surface corresponds to the final bending radian of the part of the glass cover plate to be processed, which is required to be heated, the plate wall of the joint of the side plate and the arc-shaped surface is designed to be a rounded angle, and the convection hole penetrates through the arc-shaped surface.

Preferably, the openings of the convection holes on the arc-shaped surface are arranged in a row, and the opening edge is in fillet design and is in arc-shaped surface radian engagement transition.

Preferably, the lower die further comprises an elastic device, the elastic device is uniformly arranged between the base body accommodating space bottom plate and the bearing piece, the bearing piece is elastically supported, the elastic device is synchronously stressed to generate elastic deformation when the glass cover plate needs to be bent and deformed by stress, and the elastic device is a high-temperature-resistant spring.

Preferably, the base body is provided with positioning columns which are of a hollow cylindrical structure, the elastic device is accommodated in the positioning columns, the lower surface of the bearing part is provided with a plurality of grooves, the grooves correspond to the positioning columns one to one, and the outer diameters of the positioning columns are smaller than the inner diameters of the grooves.

Preferably, the lower surface of the groove and the wall of the opening matched with the positioning column are rounded, and the upper surface of the positioning column and the outer wall of the opening matched with the groove are rounded. Preferably, the hot bending die further comprises an upper die, the upper die comprises a cover plate, a boss is arranged at the gap between the cover plate and the lower die base body, the boss is provided with an arc-shaped section, the arc-shaped section is bent to form a radian, the radian of the arc-shaped section is matched with the arc surface of the side plate, the edge of the glass cover plate to be processed is jointly hot bent, and the radian of the edge of the glass cover plate to be processed is defined.

Preferably, go up the mould and still include first splint, the boss still includes the changeover portion, form a concave part between the boss, first splint set up in the concave part, the changeover portion sets up between segmental arc and concave part, connects segmental arc and concave part, just first splint with wait to process the one side that the glass apron contacted with the changeover portion on the coplanar.

Preferably, the base member with the apron is made of graphite, hold carrier with first splint are the high temperature resistant ceramic material that the thermal conductivity is lower than graphite and make, hold carrier with first splint centre gripping is waited to process glass apron need not the two relative planes of hot bending part jointly, hold the design of the edge radius angle of the relative both sides on the length direction of carrier.

Compared with the prior art, the glass cover plate hot bending die provided by the invention has the following advantages:

1. the invention provides a hot bending die for hot bending a glass cover plate, which comprises a lower die and a bearing piece. The lower die comprises a base body, the base body forms an accommodating space, and the bearing piece is placed in the accommodating space and used for bearing the glass cover plate to be processed. The gap between the side plate of the lower die accommodating space and the bearing piece is provided with a convection hole which penetrates through the base body, the convection hole can accelerate heat convection, the part of the glass cover plate to be subjected to heat bending is quickly heated to reach softening temperature, the softened part of the glass cover plate to be subjected to heat bending is deformed under pressure to form required 3D glass, the time required by heat bending is saved, and the heat bending efficiency of the glass cover plate is improved.

2. The side plate of the base body accommodating space is provided with an arc-shaped surface, the arc-shaped surface is matched with the radian of the glass cover plate to be bent, the arc-shaped surface is arranged corresponding to two opposite side edges of the bearing part, the side plate is in clearance fit with the bearing part, and the clearance can further enhance the heat convection in the accommodating space to reduce the time required by the heat bending of the glass cover plate.

3. The lower mould still includes a plurality of resilient means, resilient means evenly lays between base member and the carrier, the realization supports the resilient means who holds the carrier, when receiving the exogenic action, make and hold and have certain elastic buffer between carrier and the lower mould, give and place the certain elastic buffer of cover plate glass on the carrier when the edge is hot bent, can make the effort of exerting on treating the processing glass apron homodisperse, thereby reduce the part of treating the processing glass apron and receive too big pressure and the problem of inequality or stress concentration appears, prevent that glass apron extrusion is cracked when hot bending, improve glass apron hot bending quality, the time of getting glass of operating personnel has also been saved simultaneously, and the production efficiency is improved.

4. The elastic device is a high-temperature-resistant spring which can be elastically deformed for many times within the elastic deformation range, and the glass cover plate to be processed does not need to be replaced after being processed for many times, so that the processing cost of the glass cover plate is saved.

5. The hot bending die further comprises an upper die, the upper die comprises a cover plate, the cover plate is provided with a boss corresponding to the edge of the glass cover plate needing hot bending, an arc section is arranged on the boss and matched with the arc surface of the lower die, so that the inner surface and the outer surface of the glass cover plate needing hot bending area to be processed can be acted by force at the same time, the inner surface and the outer surface of the glass cover plate needing hot bending are balanced, the forming degree is equivalent, and therefore a better glass cover plate hot bending forming effect can be obtained.

6. The upper die is provided with a first clamping plate. Apron and base member are graphite and make, first splint and carrier are high temperature resistant pottery and make, first splint and the common centre gripping glass apron of carrier need not the plane of hot bending with carrier, because high temperature resistant pottery's heat conductivity is less than graphite for the glass apron need not the plane surface temperature rise of hot bending slower, apron glass need not hot bending part can not produce the pit because of the high temperature, guarantee the planarization on glass surface, high temperature resistant pottery's surface quality is higher than graphite and further guarantees need not the surface quality of hot bending department glass simultaneously. .

7. The edge rounding design of the two opposite sides in the width direction of the bearing part ensures that the edges of the two opposite sides of the bearing part and the glass cover plate to be processed can not generate indentation or scratch due to hard contact when the bearing part is in hot press contact with the glass cover plate in the hot bending process. Further, when bearing the piece and base member relative displacement, in order to reduce the friction between reference column and the recess, make the relative displacement that can be more steady between reference column and the recess, reference column upper surface and recess complex opening part outer wall radius angle design, recess and reference column cooperation opening part inner wall edge radius angle design.

[ description of the drawings ]

Fig. 1A is a schematic perspective view of a hot bending die according to the present invention.

Fig. 1B is an exploded view of the hot-bending die of the present invention.

FIG. 1C is a schematic view of a first perspective view of a glass cover plate to be hot bent according to the hot bending mold of the present invention.

FIG. 1D is a schematic view of a second perspective view of a glass cover plate to be hot bent according to the hot bending mold of the present invention.

Fig. 2 is an exploded view of the upper die structure of the hot bending die of the present invention.

Fig. 3A is a first perspective structural view of a cover plate of the hot bending mold according to the present invention.

Fig. 3B is a schematic cross-sectional view taken along a-a in fig. 3A.

Fig. 3C is an enlarged schematic view of fig. 3B at a.

FIG. 3D is a schematic cross-sectional view taken along line B-B in FIG. 3A.

Fig. 4 is a first perspective view of the first clamping plate of the hot bending mold according to the present invention.

Fig. 5A is a schematic perspective view of the lower mold of the hot bending mold of the present invention.

Fig. 5B is a schematic perspective view of the base of the lower die of the hot bending die according to the present invention.

Fig. 5C is a first perspective structural view of the base of the lower die of the hot bending die of the present invention.

FIG. 5D is a second perspective structural view of the base of the lower die of the hot bending die of the present invention.

Fig. 5E is a schematic cross-sectional view along C-C of fig. 5D.

Fig. 5F is an enlarged schematic view of C in fig. 5E.

Fig. 5G is a schematic cross-sectional view taken along D-D in fig. 5D.

Fig. 5H is an enlarged schematic view of fig. 5G at D.

FIG. 5I is a schematic view showing the structure of the upper and lower dies of the hot bending die of the present invention.

Fig. 6A is a perspective view of a carrier of the hot bending die of the present invention.

Fig. 6B is a schematic view of the structural cooperation between the upper mold and the carrier of the hot bending mold of the present invention.

Fig. 7A is a first perspective view of a base of a hot-bending die carrier according to the present invention.

Fig. 7B is a schematic cross-sectional view taken along E-E in fig. 7A.

Fig. 7C is an enlarged schematic view of B in fig. 7B.

Fig. 8 is a schematic view of the structure of the hot bending die carrier of the present invention engaged with the lower die.

FIG. 9A is a schematic structural view of a first state of hot bending of a glass cover plate by the hot bending mold of the present invention.

FIG. 9B is a structural schematic diagram of a second state of hot bending of a glass cover plate by the hot bending die of the present invention.

FIG. 9C is a structural view of a third state of hot bending of a glass cover plate by the hot bending die of the present invention.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be particularly noted that when an element is referred to as being "disposed on" or "provided on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," and "lower," and similar expressions, as used herein, are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1A-1D, M is a rectangular glass cover to be subjected to a hot bending process, which is a flat glass, and the glass cover to be processed includes a region to be subjected to hot bending M1 and a flat region M2, wherein M1 is located at two opposite sides of M2. The invention provides a hot bending die 10, which is used for carrying out hot bending treatment on a plane glass cover plate, and carrying out hot bending treatment on two opposite side edges M1 of the glass cover plate to ensure that the edge M1 has a certain radian, even if a common plane glass cover plate is changed into 3D glass. The two opposite side edges M1 are determined according to the actual hot bending needs of the cover glass, and may be two sides of the rectangular glass cover plate with longer side length or two sides with shorter side length. The present embodiment will be described in detail by taking two sides with longer side length as an example. The hot bending die 10 includes an upper die 30, a carrier 50, a positioning member 70, and a lower die 90. The upper die 30 is arranged on the bearing piece 50, the bearing piece 50 is accommodated in the lower die 90 and can elastically move for a certain distance relative to the lower die 90 so as to provide certain hot bending buffering for the glass cover plate in the hot bending process, prevent the glass cover plate from being suddenly stressed and cracked in the hot bending process and improve the hot bending quality and efficiency of the glass cover plate. The three structural combinations of the upper mold 30, the carrier 50, and the lower mold 90 define the curvature at M1 of the edge location of the glass cover sheet to be processed. The positioning pieces 70 penetrate through the upper die 30 and the lower die 90, so that the upper die 30 and the lower die 90 are positioned, the upper die 30 and the lower die 90 are prevented from relative displacement in the glass cover plate machining process, the stress direction of the glass cover plate in hot bending is changed, and the machining quality of the glass cover plate is influenced.

The glass cover plate to be processed is placed between the upper die 30 and the bearing piece 50, the hot bending die 10 is placed in a heating device, when the glass cover plate to be processed reaches the softening temperature under the action of heat, an external force which is perpendicular to the placing plane direction of the glass cover plate to be hot bent and faces towards the lower die is applied to the upper die 30 at the moment, the softened part of the glass cover plate is stressed to deform, and the glass cover plate with the required edge M1 bent in a certain radian is obtained after force application and shaping are carried out for a certain time.

Referring to fig. 2, 3A-3D and 4, the upper mold 30 includes a cover plate 301 and a first clamp plate 303. The cover plate 301 is made of graphite material, which has good heat conductivity and can be matched with the bearing member 50 and the lower die 90 to rapidly heat and bend the glass cover plate. The first clamping plate 303 is a rectangular flat plate, the length of the first clamping plate is longer than that of the glass cover plate to be processed, the width of the first clamping plate is slightly smaller than that of a region of the glass cover plate to be processed, which does not need to be subjected to hot bending, and the thickness of the first clamping plate 303 is 2-5 mm. The first clamping plate 303 is made of a high temperature resistant ceramic material, which has a lower thermal conductivity than graphite, so that the first clamping plate 303 made of the high temperature resistant ceramic has a lower thermal conductivity than the cover plate 301 made of graphite under the same external temperature condition. In the process of hot bending the glass cover plate, the edge M1 of the glass cover plate is only required to be hot bent, so that the hot bending effect of the edge M1 is ensured, and meanwhile, the flatness of the M2 part of the glass cover plate, which is not required to be hot bent, is ensured, and therefore the upper die 30 is made of two high-temperature-resistant materials with large heat conductivity difference. Therefore, the part M1 of the glass cover plate needing to be bent quickly rises to reach the softening temperature firstly, the temperature of the part M2 of the plane area needing not to be bent is lower than that of the part M1 needing to be bent, and therefore the part M2 of the plane area needing not to be bent is prevented from softening the surface of the part of the plane area to generate pits due to overhigh temperature and influencing the surface quality of the part of the plane area.

Meanwhile, after the high-temperature resistant ceramic is subjected to polishing treatment in the same process, the surface quality, namely the surface fineness is higher than that of graphite, so that the surface smoothness of the glass cover plate to be processed without a hot bending plane area can be further ensured.

Specifically, a boss 3011 is respectively arranged on two opposite sides of one surface of the cover plate 301, which is in contact with the glass cover plate, the position of the boss 3011 corresponds to the part of the edge M1 to be thermally bent of the glass cover plate, and the length of the boss 3011 is greater than the length of the part of the edge M1 to be thermally bent of the glass cover plate, so that the part of the glass cover plate to be thermally bent is sufficiently thermally bent and formed. The side of the boss 3011, which is in contact with the glass cover plate, is provided with an arc section 3012, the arc angle of the arc section 3012 is a1, the size of a1 matches the size of the curvature needed by the glass cover plate edge M1, and the arc section 3012 is matched with the bearing member 50 and the lower die 90 to make the glass cover plate M1 into the curved surface to be curved.

A concave part 3013 is arranged between the bosses 3011, the shape and size of the concave part 3013 correspond to those of the first clamp plate 303, the first clamp plate 303 is accommodated in the concave part 3013, at least two first positioning holes 3031 are arranged in the length direction of the first clamp plate 303, and at least two second positioning holes 3016 corresponding to the first positioning holes 3031 of the first clamp plate 303 are arranged on the bottom surface of the concave part 3013. The number, shape and position of the second positioning holes 3016 and the first positioning holes 3031 are matched and correspond. The upper die 30 further comprises a positioning sheet 305, the positioning sheet 305 is matched with the second positioning hole 3016 and the first positioning hole 3031 in shape, the positioning sheet 305 penetrates through the second positioning hole 3016 and the first positioning hole 3031 and is used for fixing the first clamping plate 303 on the cover plate 301, relative displacement of the first clamping plate 303 and the cover plate 301 is prevented, the glass cover plate hot bending forming quality is affected, meanwhile, a glass cover plate to be processed is placed between the positioning sheets 305 for positioning, and the hot bending quality of the glass cover plate is guaranteed. As a modification, in order to achieve stable connection between the cover plate 301 and the first clamp plate 303, a concave portion may be provided in the cover plate 301, a convex portion matching the concave portion may be provided in the first clamp plate 303, and stable connection may be achieved by structural engagement. Or it is understood that a convex portion may be provided on the cover plate 301, and a concave portion matching the convex portion may be provided on the first clamping plate 303 to realize a stable connection.

Further, because the arc section 3012 of apron 301 is used for carrying out the hot bending to the glass apron, first splint 303 is used for preventing that the glass apron need not the hot bending region and is heated the deformation, if first splint 303 directly links up with arc section 3012 directly, because arc section 3012 is made by graphite, first splint 303 has the high temperature resistant pottery that the thermal conductivity is less than graphite to make, it is great to make the glass apron that contacts with first splint 303 and the glass apron that arc section 3012 contacted, easily make the glass apron break or even break during bending, influence the production quality of glass apron. In order to provide a gradual temperature increase between the first clamp plate 303 and the arcuate section 3012, a transition section 3014 is integrally formed with the arcuate section 3012 on the boss 3011. The transition section 3014 has a length H1, a size H1 is 1-4mm, and the transition section 3014 is disposed between the first clamp plate 303 and the arc section 3012, and connects the first clamp plate 303 and the arc section 3012, thereby providing a sufficient temperature transition section for the glass cover plate. Meanwhile, the surface of the transition section 3014, which is in contact with the glass cover plate, is a plane, after the first clamping plate 303 and the cover plate 301 are assembled, the surface of the first clamping plate 303, which is in contact with the glass cover plate, of the transition section 3014 of the boss 3011 and the surface of the first clamping plate 303, which is in contact with the glass cover plate, are on the same plane, so that the damage of the hot-bent glass cover plate due to the height difference between the transition section 3014 and the first clamping plate 303 when the glass cover plate is hot-bent is avoided.

Referring to fig. 2 and fig. 3A again, a surface of the cover plate 301 away from the glass cover plate is rectangular, at least four upper through holes 3015 are formed in the cover plate 301, the upper through holes 3015 are respectively formed in four corners of the surface of the upper mold 30, and the positioning element 70 passes through the upper through holes 3015 to be matched with the lower mold 90 for positioning.

Meanwhile, a plurality of first air guide grooves 3017 are formed in the surface, far away from the surface, contacting the glass cover plate, of the cover plate 301, and when the heating device is attached to the surface, far away from the surface, contacting the glass cover plate, of the cover plate 301, the contact area between the heating device and the cover plate 301 is too large, the attachment is too tight, and the separation is difficult. Or when the heating device is separated from the cover plate 301, the cover plate 301 is moved along with the heating device due to the fact that the heating device is attached to the cover plate 301 too tightly, and in the moving process, the cover plate 301 may fall off, so that the first air guide groove 3017 can effectively reduce the attachment area between the heating device and the cover plate 301, reduce attachment force, and prevent the problem that the cover plate 301 is attached to the heating device too tightly.

Referring to fig. 5A-5I, the lower mold 90 is a concave structure, and includes a substrate 901 and an elastic device 903. The elastic device 903 is arranged between the base 901 and the cavity bearing piece 50, and the elastic device 903 is elastically deformed when the glass cover plate is heated and subjected to force application and hot bending, so that certain buffering is provided for the glass cover plate placed on the bearing piece 50, and the glass cover plate is prevented from being broken due to the fact that the glass cover plate is stressed violently when the glass cover plate is subjected to hot bending and is not buffered.

The base 901 is integrally formed from graphite and is used to receive the carrier 50 and to thermally bend the glass cover plate in cooperation with the carrier 50 and the forming structure of the upper mold 30. Specifically, the base 901 includes a bottom plate 9011 and a side plate 9013. The bottom plate is a rectangular flat plate, the side plates 9013 are vertically arranged on two opposite sides of the bottom plate 9011 and are matched with the bottom plate 9011 to form a containing space containing a concave shape, the bearing piece 50 is placed in the containing space, and hot air can pass through the containing space to heat the glass cover plate to be processed.

An arc-shaped surface 9017 is arranged on the side plate 9013, the arc-shaped surface 9017 is arranged corresponding to the arc-shaped section 3012 of the boss 3011 of the cover plate 301, the arc-shaped surface 9017 and the arc-shaped section 3012 form a curved surface structure to match when the elastic device 903 is in a compressed state, the bending radian of a region to be thermally bent of the glass cover plate is defined, and after the region to be thermally bent of the glass cover plate is thermally bent, the required 3D glass cover plate is formed. That is, when the boss 3011 is matched with the arc surface 9017 in radian, the boss 3011 may protrude outwards to form a certain radian, and the arc surface 9017 may protrude inwards to form a matched radian; or the boss 3011 is sunken inwards to form a certain radian, the cambered surface 9017 is protruded outwards to form a matched radian, and in short, the cooperation of the boss 3011 and the cambered surface 9017 radians can ensure that the glass cover plate to be processed needs to be bent in a hot bending area shape to form a needed radian.

Further, when the cover glass is subjected to hot bending, in order to enable the temperature rise of the part, needing to be bent, of the cover glass to be fast, a plurality of convection holes 9015 are formed in the side plate 9013, the convection holes 9015 penetrate through the base body 901, the openings, close to the side, of the cover glass to be processed, of the convection holes 9015 are located on the arc-shaped surface 9017, the openings of the convection holes 9015 are arranged in an equidistant mode, when the cover glass is subjected to hot bending, hot air flows penetrate through the convection holes 9015 to strengthen hot air convection of the area, needing to be hot bent, of the glass cover plate, meanwhile, the hot air flows are uniformly blown to the area, needing to be hot bent, of the cover glass, the temperature of the area, needing to be hot bent, is increased to the area, the lowest softening point is achieved quickly, the time needed by hot bending. Meanwhile, in order to prevent the opening of the convection hole 9015 from leaving marks in the hot bending area of the glass cover plate when the convection hole 9015 is in contact with the hot bending area of the glass cover plate, the convection hole 9015 is circular and is provided with a diameter d of preferably 1.5-3 mm. The opening edge of the convection hole 9015 is rounded off and is in connection transition with the arc surface, so that the connection part between the convection hole 9015 and the arc surface 9017 is in smooth transition, and the occurrence of marks in the hot bending area of the cover plate glass is reduced.

Because the bottom plate 9011 is also attached to the heating device, the contact area between the bottom plate and the heating device is too large, the bottom plate and the heating device are attached tightly, and the bottom plate and the heating device are difficult to separate. Therefore, a plurality of second air guide grooves 9014 are formed in one side, far away from the positioning column 9012, of the bottom plate 9011, the second air guide grooves 9014 are recessed inwards, air circulation channels are formed in the periphery of the second air guide grooves 9014, the attaching area between the heating device and the cover plate 301 can be effectively reduced through the second air guide grooves 9014, attaching force is reduced, and the situation that the contact area between the bottom plate 9011 and the heating device is too large and the bottom plate 9011 is difficult to separate is avoided. Meanwhile, the bottom plate 9011 and the glass cover plate are designed to be rounded at the edges of the bottom surfaces of the two corresponding sides of the position needing to be bent in a hot mode, and sharp corners of the edges are prevented from colliding in the moving process of the hot bending die 10. Meanwhile, in order to accelerate the heat convection speed of the convection hole 9015, an opening of one side of the convection hole 9015, which is far away from the glass cover plate to be processed, is formed in the second air guide groove 9014, the second air guide groove 9014 is communicated with the periphery, and hot air generated by the heating device flows through the convection hole 9015 through the second air guide groove 9014 to realize heat convection at the position, where the glass cover plate to be processed needs to be heated, of the convection hole 9015.

Further, the glass cover plate to be processed is placed on the bearing piece 50, in order to be matched with the convection hole 9015 to accelerate heat convection of glass at the position, to be bent, of the glass cover plate, a gap of 0.5-2mm is formed between the side plate 9013 and two sides, corresponding to the position, to be bent, of the bearing piece 50 and the position, to be bent, of the glass cover plate, and the gap can enhance heat convection of the portion, to be bent, of the glass cover plate and accelerate the temperature of the portion, to be bent, of the glass cover plate to reach.

Furthermore, because there is a gap between the side plate 9013 and the bearing member 50, in order to ensure that the glass facing the gap when the base 901 is in thermal compression contact with the glass cover plate during the thermal bending process will not generate indentation or scratch due to hard contact with the upper mold 30, the wall of the side plate 9013 close to the bearing member 50 and at the joint with the arc-shaped surface 9017 is designed to be rounded.

The upper die 30 and the lower die 90 are positioned by the positioning element 70, so that the cover plate 301 is prevented from displacing relative to the lower die 90 during hot bending, specifically, a lower positioning hole 9019 is formed in the side plate 9013, the lower positioning hole 9019 is correspondingly matched with the upper through hole 3015 in size and position, and the positioning element 70 penetrates through the upper through hole 3015 and the lower positioning hole 9019 to fix the upper die 30 and the lower die 90.

A plurality of positioning columns 9012 are arranged on the bottom plate 9011, the positioning columns 9012 are arranged between the side plates 9013, and the positioning columns 9012 can be integrally formed with the bottom plate 9011 or can be arranged independently of one another in a clamping mode. The positioning column 9012 is of a hollow cylindrical structure, and the diameter of a hollow round hole is 6-7 mm. The elastic device 903 is disposed in the positioning pillar 9012, and when the elastic device 903 is elastically deformed to the maximum, the height of the elastic device 903 is greater than or equal to the height of the positioning pillar 9012, so that the supporting member 50 can elastically buffer when moving relative to the base 901 in a direction perpendicular to the placement direction of the glass cover plate, cracks caused by hard contact between the supporting member 50 and the base 901 when the glass cover plate placed on the supporting member 50 is bent are prevented, abrasion of the groove 5031 or the positioning pillar 9012 due to direct hard contact between the groove 5031 and the positioning pillar is also prevented, and the positioning pillars 9012 are uniformly distributed on the bottom plate 9011, so that the elastic distribution is more uniform when the lower mold 90 is elastically matched with the supporting member.

In order to ensure that the elastic force is more uniform when the elastic device 903 is elastically matched with the bearing element 50 and the base 901, two ends of the elastic device 903, which are in contact with the bearing element 50 and the base 901, are both flat surfaces, that is, the elastic device 902 is in surface contact with both the bearing element 50 and the base 901. Meanwhile, after the glass cover plate is subjected to hot bending, the elastic device 903 is restored to the original state, and the good elastic restoring force of the elastic device 903 ensures that the glass cover plate can be used for multiple times. The elastic means 903 may be a high temperature resistant spring or a high temperature resistant spring plate, preferably a high temperature resistant spring. The high-temperature resistant spring can be elastically deformed for multiple times within the elastic deformation range, and the glass cover plate to be processed does not need to be replaced after being processed for multiple times, so that the processing cost of the glass cover plate is saved.

Further, when bearing piece 50 and base member 901 relative displacement, in order to reduce the friction between reference column 9012 and the bearing piece 50, make reference column 9012 and the bearing piece 50 between can more steady relative displacement, the outer wall of the opening that the upper surface of reference column 9012 and bearing piece 50 cooperate is the fillet design of radian a 2.

Referring to fig. 6A-6B and fig. 7A-7C, the dimension of the supporting element 50 in one direction is smaller than the dimension of the accommodating space formed by the base 901 of the lower mold 90 in the same direction, so that a gap is formed between two opposite sides of the supporting element 50 in the direction and the side plates 9011 at two sides of the corresponding accommodating space. The bearing piece 50 is placed in the containing space formed by the base 901 of the lower die 90 and used for bearing a glass cover plate to be processed and is matched with the first clamping plate 303 to clamp the glass cover plate to be hot-bent together, so that the glass cover plate to be hot-bent does not need a hot-bending area and a certain temperature difference is formed in the hot-bending area, and deformation of the hot-bending area is avoided while deformation of the hot-bending deformation part is ensured. Further, in order to ensure that the temperature difference between the clamping surfaces of the clamped glass cover plate is small, the bearing member 50 and the first clamping plate 303 are made of the same high-temperature-resistant ceramic material.

The bearing member 50 is rectangular with a thickness of 15-30mm, a gap exists between the bearing member 50 and the side plate 9011 of the base 901, the gap can accelerate air heat convection at a position where a glass cover plate to be processed needs to be bent, therefore, the width of the bearing member 50 is slightly smaller than that of a part, where the glass cover plate needs not to be bent, of the glass cover plate to be processed, the length of the bearing member 50 is the same as that of the first clamping plate 303, and the bearing member 50 comprises an upper surface 501 and a lower surface 503. The upper surface 501 is provided with a third positioning hole 505, the third positioning hole 505 has the same size and corresponding position as the first positioning hole 3030 and the second positioning hole 3016, and the positioning piece 305 passes through the third positioning hole 5012 and fits the first positioning hole 3031 of the first clamping plate 303 and the second positioning hole 3016 of the cover plate 301 to clamp and fix the glass cover plate.

Further, the width of the bearing part 50 is slightly smaller than that of the glass cover plate to be hot-bent, meanwhile, a gap of 0.5-2mm is formed between the two sides, which need to be hot-bent, of the bearing part 50 relative to the glass cover plate to be processed and the lower die 90, and heat convection is generated at the gap, so that the temperature of the glass cover plate opposite to the gap is closest to the temperature of the glass cover plate to be hot-bent, no friction can be ensured between the bearing part 50 and the lower die 90, and the lifting of the bearing part 50 is facilitated. In order to ensure that the glass facing the gap when the bearing member 50 is in hot press contact with the glass cover plate during the hot bending process will not generate indentation or scratch due to hard contact with the bearing member 50, the upper surface 501 of the bearing member 50 and the edge of the glass cover plate to be hot bent are rounded.

The lower surface 503 of the bearing member 50 is recessed inwards to form a plurality of grooves 507, the grooves 507 are of a circular structure, and the grooves 507 are matched with the positioning columns 9012 in a one-to-one correspondence manner.

The inner diameter of the groove 507 is slightly larger than the outer diameter of the positioning column 9012, the depth of the groove 507 can be 2-7mm, the groove is used for being matched with the positioning column 9012 in a positioning mode and forming elastic fit with the elastic device 903, and therefore the cover glass has certain buffering effect when being bent in a hot mode. The number of grooves 507 is 4-10, preferably 6. The central line of the lower surface 503 of the bearing part 50 along the length direction is L, and the grooves 507 are symmetrically arranged on two opposite sides of the central line L in pairs, so that the elastic force applied to the bearing part 50 is uniformly distributed, and the elastic force applied to the hot-bending glass cover plate is more uniform. Further, in order to make the displacement of the supporting member 50 relative to the lower mold 90 smoother when the supporting member is elastically matched with the lower mold 90, the edge of the groove wall at the opening of the circular groove 507 is designed to be rounded off by the radian a 3.

Referring to fig. 8 and fig. 9A to 9C, in the hot bending mold 10, the first clamping plate 303 and the second clamping plate 501 clamp the portion M2 of the glass cover plate that does not need to be hot bent, and the portion M1 of the glass cover plate that needs to be hot bent is opposite to the arc-shaped surface 9017 of the side plate 9013. The resilient means 903 is placed between the carrier 50 and the base 901.

When the glass cover plate is hot-bent, the hot-bending mold 10 with the glass cover plate to be hot-bent is placed in a hot-bending furnace for heating. Because the area of the glass cover plate needing to be subjected to hot bending is over against the convection hole 9015, under the convection action of the convection hole 9015, the area of the glass cover plate needing to be subjected to hot bending is quickly heated to reach the softening temperature firstly. Meanwhile, the glass cover plate is clamped by the first clamping plate 303 and the bearing piece 50 which are made of high-temperature-resistant ceramic materials together in the non-bending-required area of the glass cover plate, the heat conducting performance of the high-temperature-resistant ceramic materials is poorer than that of graphite, and the temperature of the non-bending-required area of the glass cover plate is further lower than that of the bending-required area, namely when the temperature of the non-bending-required area of the glass cover plate reaches the minimum temperature required by the bending, the temperature of the non-bending-required area does not reach the minimum temperature required by the bending of. The hot bending temperature can be judged by reading the hot bending furnace.

When the temperature of the area of the glass cover plate requiring hot bending reaches the temperature required for hot bending, a force F perpendicular to the glass cover plate and facing the lower mold 90 is applied to the upper mold 30, and under the action of the force F and the positioning cooperation of the positioning columns 9012 and the grooves 5031, the elastic device 903 is elastically deformed to generate an acting force opposite to the force F, but the magnitude of the opposite acting force is slightly smaller than the force F. Under the buffer action of the reverse acting force, the glass cover plate slowly moves, the region of the glass cover plate needing to be thermally bent is slowly close to the arc-shaped surface 9017 and is in contact with the arc-shaped surface 9017, and because the temperature of the region needing to be thermally bent reaches the softening temperature of glass, under the action of external force, the arc-shaped surface 9017 on the side plate 9013 of the base body 901 of the lower die 90 and the arc-shaped section 3012 on the boss 3011 of the cover plate 301 of the upper die 30 press-fit the region of the glass cover plate needing to be thermally bent into a required radian. The surface temperature of the flat area part of the cover plate glass which does not need to be bent by heat is lower than the lowest softening temperature of the glass, so that the problem that the surface quality of the flat area is influenced by pocking marks generated on the surface of the glass by temperature rise of the flat area part is avoided.

After the hot bending is completed, the height of the elastic device 903 is slightly higher than the plane of the positioning pillar 9012, which is in contact with the groove 5031, so as to prevent the groove 5031 or the positioning pillar 9012 from being worn due to direct hard contact between the groove 5031 and the positioning pillar.

Compared with the prior art, the hot bending die 10 provided by the invention has the following advantages:

6. The upper die is provided with a first clamping plate. Apron and base member are graphite and make, first splint and carrier are high temperature resistant pottery and make, first splint and the common centre gripping glass apron of carrier need not the plane of hot bending with carrier, because high temperature resistant pottery's heat conductivity is less than graphite for the glass apron need not the plane surface temperature rise of hot bending slower, apron glass need not hot bending part can not produce the pit because of the high temperature, guarantee the planarization on glass surface, high temperature resistant pottery's surface quality is higher than graphite and further guarantees need not the surface quality of hot bending department glass simultaneously.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. A hot bending die for hot bending an edge of a glass cover plate, comprising: including lower mould and carrier, the lower mould includes the base member, and the base member includes bottom plate and curb plate, forms an accommodation space between bottom plate and the curb plate, and carrier places in this accommodation space for bear and treat the processing glass apron, the curb plate is located the relative both sides of base member correspond with the part that the processing glass need the hot bending, is provided with the arcwall face on the curb plate, the arcwall face corresponds the relative both sides limit setting of carrier, carrier size in one direction is less than this accommodation space size in same direction in order to form the clearance between the curb plate of carrier in the both sides of relative both sides limit and the accommodation space that corresponds in this direction, seted up on the arcwall face and run through the flow hole of base member, the clearance size is 0.5-2 mm.

2. The hot-bending die of claim 1, wherein: the bending radian of the arc-shaped surface corresponds to the final bending radian of the heat-needed bent part of the glass cover plate to be processed, the plate wall of the joint of the side plate and the arc-shaped surface is designed to be a rounded angle, and the convection hole penetrates through the arc-shaped surface.

3. The hot-bending die of claim 1, wherein: the openings of the convection holes on the arc-shaped surface are arranged in a row, and the opening edge rounding design is in linking transition with the arc-shaped surface radian.

4. The hot-bending die of claim 1, wherein: the lower die further comprises an elastic device, the elastic device is uniformly arranged between the base body containing space bottom plate and the bearing piece and used for elastically supporting the bearing piece, the elastic device is synchronously stressed to generate elastic deformation when the glass cover plate is stressed and deformed, and the elastic device is a high-temperature-resistant spring.

5. The hot-bending die of claim 4, wherein: the base body is provided with positioning columns which are of hollow cylindrical structures, the elastic device is contained in the positioning columns, the lower surface of the bearing part is provided with a plurality of grooves, the grooves correspond to the positioning columns one to one, and the outer diameters of the positioning columns are smaller than the inner diameters of the grooves.

6. The hot-bending die of claim 5, wherein: the lower surface of the groove and the wall of the opening matched with the positioning column are rounded, and the upper surface of the positioning column and the outer wall of the opening matched with the groove are rounded.

7. The hot-bending die of claim 2, wherein: the hot bending die further comprises an upper die, the upper die comprises a cover plate, a boss is arranged at the gap between the cover plate and the lower die base body, the boss is provided with an arc section, the arc section is bent to form a radian, the arc surface is matched with the arc section, the edge of the glass cover plate to be processed is hot bent jointly, and the radian of the edge of the glass cover plate to be processed is defined.

8. The hot-bending die of claim 7, wherein: the upper die further comprises a first clamping plate, the boss further comprises a transition section, a concave portion is formed between the bosses, the first clamping plate is arranged in the concave portion, the transition section is arranged between the arc-shaped section and the concave portion and is connected with the arc-shaped section and the concave portion, and the first clamping plate and one surface of the cover plate of the glass to be processed, which is in contact with the transition section, are on the same plane.

9. The hot-bending die of claim 8, wherein: the base member with the apron is graphite and makes, hold carrier with first splint are the high temperature resistant ceramic material that the thermal conductivity is lower than graphite and make, hold carrier with two relative planes that glass apron need not the curved part of heat are waited to process to the common centre gripping of first splint, hold the design of the marginal radius angle of the relative both sides on the carrier length direction.