CN208414222U - Efficient 3D cover-plate glass preheating device and hot-bending machine - Google Patents

Abstract

The utility model discloses efficient 3D cover-plate glass preheating device and hot-bending machine, the preheating device of efficient 3D cover-plate glass, including at least the second preheating station using electromagnetic induction heating device heating and the third preheating station heated using resistance heating device positioned at its rear.Resistance heating and electromagnetic induction heating are combined the preheating for carrying out molding die by this programme, it can greatly accelerate heating efficiency, it is preheated relative to individual resistance heating, the preheating time of half can be reduced, preheating time can foreshorten to 10-20s, improve preheating speed, relative to individual electromagnetic induction heating, molding die and cover-plate glass can be effectively set to realize the homogenization of temperature after electromagnetic induction heating heating, pressing process middle cover glass sheet damages caused by avoiding because of heating temperature unevenness, to improve the yield of 3D cover-plate glass finished product, efficiency is realized to improve and the improved effective combination of yield.

Description

Efficient 3D cover-plate glass preheating device and hot-bending machine

Technical field

The utility model relates to cover-plate glass manufacture field, especially efficient 3D cover-plate glass preheating device and hot-bending machine.

Background technique

With the arrival in 5G signal epoch, the shortcomings that traditional metal shell shielded signal, tends to be obvious.

Glass has many merits such as novel appearance, comfortable feel, good plasticity as phone housing, gradually Replace traditional plastic shell and metal shell.

Newest innovation first is that obtaining three-dimensional structure shape by the edge or center of curved glass, i.e., by adding Surrounding while hot and to cover-plate glass applies pressure, to make the cover-plate glass under existing two-dimensional plane state bend to 3 dimensions Shape.

The existing heating means applied to 3D hand-set lid glass moulding processes mainly have resistor rod heating and electromagnetism sense It should heat.

Resistor rod thermoforming process is heated by resistance heating tube, indirect heating forms by way of heat transfer Mold makes Glass Transition, but resistance heating is slow, and molding die passes through the thermal loss taken away after each station, needs longer Time carry out temperature-compensating, and heat maximum temperature be restricted.

Electromagnetic induction heating is that mould inside is made to generate electric current using electromagnetic induction, by the energy warms shaping mould of vortex Tool, its advantage is that molding die can be made to reach the temperature of glass softening point in a few seconds, the disadvantage is that due to the characteristic of electromagnetism, Molding die is high close to coil sides temperature, low far from coil distal temperature, causes the thermal uniformity of molding die excessively poor, thus Cause the thermal uniformity of cover-plate glass very poor, causes the 3D cover-plate glass yield of final compression moulding very low.

Utility model content

The purpose of this utility model is exactly to provide efficient 3D cover board glass to solve the above-mentioned problems in the prior art Glass preheating device and hot-bending machine.

The purpose of this utility model is achieved through the following technical solutions:

The preheating device of efficient 3D cover-plate glass, including at least the second pre- thermal technology using electromagnetic induction heating device heating Position and the third preheating station heated positioned at its rear using resistance heating device.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: the induction of the electromagnetic induction heating device Frequency is between 30kHz-80kHz, voltage 380VAC.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: second preheating station uses electromagnetism sense Heating equipment and resistance heating device is answered to carry out composite heating.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: the front end of second preheating station is also set It is equipped with the first preheating station heated using resistance heating device.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: the resistance heating device includes that position is solid Fixed lower heating module and liftable upper heating module, the lower heating module and upper heating module include being built-in with resistance The heat block of stick heating tube, the heat block are provided with heat-proof device, the heat-proof device connection backwards to the side of molding die Radiator, the driving device of its lifting of the radiator connection driving of the upper heating module.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: the heat-proof device is connect with heat block line The body of stainless steel or superalloy body of touching and/or Multi-contact, the radiator are the cooling equipment using coolant liquid.

Preferably, the preheating device of the efficient 3D cover-plate glass, in which: the third preheating station includes 1-3 Independent sub-station.

Efficient 3D cover-plate glass hot-bending machine, including pre- thermal engineering station, molding station, cooling station and for make molding die according to The secondary conveying equipment by each station further includes the preheating device of any of the above-described efficient 3D cover-plate glass.

Preferably, the efficient 3D cover-plate glass hot-bending machine, in which: the molding station is set using the resistance heating It is standby to be heated, so that molding die is maintained at softening point temperature；The cooling station is lower than the electricity of molding die using temperature It hinders heating equipment and realizes cooling.

The advantages of technical solutions of the utility model, is mainly reflected in:

This programme deft design, structure is simple, and resistance heating and electromagnetic induction heating are combined and carry out the pre- of molding die Heat can greatly accelerate heating efficiency, preheat relative to resistance heating, can reduce the preheating time of half, preheating time can 10-20s is foreshortened to, preheating speed is greatly improved, shortens whole process time, by specifically adding to each station of pre- thermal engineering station The setting of hot mode can effectively make molding die and cover-plate glass in electromagnetism sense relative to individual electromagnetic induction heating The homogenization that temperature is realized after heat temperature raising is answered, pressing process middle cover glass sheet damages caused by avoiding because of heating temperature unevenness Wound realizes efficiency and improves and the improved effective combination of yield to improve the yield of 3D cover-plate glass finished product.

First preheating station of resistance heating is set before electromagnetic induction heating, can effectively meet equipment feeding inlet temperature Requirement that cannot be excessively high is spent, meanwhile, advantageously ensure that molding die and cover-plate glass heat in the heating rate that they allow Heating reduces the adverse effect to molding die and cover-plate glass performance.

In the second preheating station further combined with resistance heating manner, heating method in two is superimposed, is conducive to further The rate of heat addition is improved, to save preheating time, improves overall processing efficiency.

Using the resistive heating device of specially made structure, by reducing the contact area of heat block and heat-proof device, to subtract Small heat block improves heating efficiency because of thermal loss caused by heat transfer, while can effectively be avoided by cooling device The influence for the equipment that high temperature pair is connect with heating module, can especially reduce causes movement deformation bring compacting to miss because heated Difference is conducive to the service life for improving equipment and improves product yield.

It in pressing process, is heated using resistive heating device, the uniformity of molding die temperature can be further realized, To guarantee cover-plate glass thermally equivalent, be conducive to improve product yield.

In cooling procedure, by the setting of the temperature to first cooling station, to not broken in guarantee cover-plate glass Under the premise of broken, cooling efficiency is improved, to be conducive to improve whole processing efficiency.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the resistance heating device structural schematic diagram of the utility model；

Fig. 3 is the temperature changing curve diagram of the processing technology of the utility model.

Specific embodiment

The purpose of this utility model, advantage and feature will carry out figure by the non-limitative illustration of preferred embodiment below Show and explains.These embodiments are only the prominent examples using technical solutions of the utility model, all to take equivalent replacement or wait Effect transformation and formed technical solution, all fall within the requires of the utility model protection within the scope of.

In the description of utility model, it should be noted that term " center ", "upper", "lower", "left", "right", " preceding ", The orientation or positional relationship of the instructions such as " rear ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position Relationship, be merely for convenience of description and simplification description, rather than the device or element of indication or suggestion meaning must have it is specific Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

The efficient 3D cover-plate glass hot-bending machine of the utility model is explained with reference to the accompanying drawing, is applied to 3D phone cover The processing such as glass sheet, 3D tablet computer cover-plate glass, 3D liquid crystal display glass, as shown in Fig. 1, including pre- thermal engineering station 1, i.e., in advance Thermal, the pre- thermal engineering station 1 include at least the second preheating station 12 at least heated using electromagnetic induction heating device 5 And gap setting is in the third preheating station 13 heated using resistance heating device 6 at its rear.

Wherein, the electromagnetic induction heating device 5 includes at least cricoid induction coil and connect with the induction coil And the power supply unit of alternating current is provided for it, the induction coil can connect on lifting structure, thus in preferably stone General who has surrendered's molding die 4, which entangles, when the molding die 4 of black material is moved to heating location, under induction coil heats, and is heating After, induction coil rises, and moves molding die 4.

Certainly, in other embodiments, the induction coil is also possible to extend certain length and is fixed on molding die The structure of pipeline periphery, molding die are heated when moving into sky inner cavity, and when removal is no longer heat up, right herein It is not construed as limiting in the specific laying form of induction coil.

Also, the electromagnetic induction heating device 5 is preferably HF induction heating apparatus, and usual frequency is in 10 kHz or more For high frequency, in this programme preferably induction frequencies between 30kHz-80kHz, so as to quickly generate violent heat source realize it is quick The voltage of heating, the electromagnetic induction heating device 5 is 380VAC, and the power of power supply unit can then be required according to actual process It is adjusted, such as when needing makes in 10s mold rise 300-400 DEG C, power be can choose as 20KW, in general: when Between it is shorter, ascending temperature is higher, and power needed for power supply unit is bigger.

In addition, in another embodiment, resistance can also be increased at second preheating station 12 according to actual needs Heating equipment 6 is heated, so as to which electromagnetic induction heating and resistance heating is compound, to further increase the rate of heat addition.

As shown in Fig. 2, the resistance heating device 6 includes that the lower heating module 61 of position fixation and liftable go up add Thermal modules 62, the preferably described lower heating module 61 are fixed on the lower section of the loading plate for carrying molding die 4, the upper heating The setting coaxial with the lower heating module of module 62, certainly, the specific setting position of the lower heating module 61 and upper heating module 62 Set, laying form and number can be adjusted according to actual needs, be such as also equipped with lower heating module in the two sides of loading plate 61 or described upper heating modules 62 are multiple and enclose groove profile etc., are not limited thereto.

Furthermore, it is understood that the lower heating module 61 and upper heating module 62 include being built-in with resistor rod heating tube 601 Heat block 602, the heat block 602 is provided with heat-proof device 603, the heat-proof device 603 backwards to the side of molding die 4 Connect radiator 604, the driving device of its lifting of the connection driving of radiator 604 of the upper heating module 62, preferably institute Stating driving device is cylinder, naturally it is also possible to be other feasible structures, be not limited thereto.

The heat-proof device 603 is to contact with 602 line of heat block and/or the body of stainless steel or superalloy of Multi-contact Body, such as it is cyclic structure, tubular structure or more independences and branching rod structure vertical with the plane of heat block etc., herein It is not construed as limiting, so as to reduce the contact area with heat block 602, reduces heat caused by heat block 602 is conducted because of heat Loss；The radiator 604 is mainly used for obstructing the heat transfer of the heat-proof device 603 and driving device, prevent cylinder with The position of upper heating module connection makes error when compacting become larger because excessive temperature distortion is so as to cause movement deformation, heat dissipation dress Setting 604 is the cooling equipment using coolant liquid, preferably water cooling equipment.

Meanwhile utility model people the study found that if by electromagnetic induction heating device 5, i.e. the second preheating station 12 is directly It is set to the pan feeding end position of hot-bending machine, then when working, pan feeding end position can have higher temperature, be unfavorable for operating personnel behaviour Make, further, due to the speed block of electromagnetic induction heating, range of temperature is big, therefore, in a short time by molding die During being warming up to target temperature from room temperature with cover-plate glass, heating rate very likely exceeds molding die and cover-plate glass energy The heating rate range enough born, adversely affects, it is therefore preferable that the front end also gap in second preheating station 12 is set It is equipped with the first preheating station 11 heated using above-mentioned resistance heating device 6, therefore the overall structure of pre- thermal engineering station 1 For the first preheating station 11 heated using resistance heating device 6 successively arranged backward from feeding end, the second pre- thermal technology Position 12 and third preheating station 13.

Entire pre- thermal engineering station 1 is usually the station of 3-5 gap setting, and specific station quantity can be according to different technique It is required that design advantageously reduces molding die residence time on each station, still by increasing the quantity of preheating station Equipment manufacturing costs and control complexity are also increased, the adjustment of the specific station quantity of pre- thermal engineering station 1 is by adjusting described The quantity of the sub-station of third preheating station 13 realizes that the quantity of preferably described sub-station is 1-3, also, when described the When three preheating stations are multiple sub-stations, and when second preheating station 12 makes the molding die 4 be heated to cover-plate glass Softening point temperature more than when, can also successively decrease between each sub-station of the third preheating station, to make molding die 4 Temperature at the uniform velocity be reduced to softening point temperature.

In actual work, as shown in Fig. 3, first preheating station 11 will be located at the shaping mould in its heating region Tool and cover-plate glass are first heated to certain temperature with the lower rate of heat addition, and the temperature and target temperature still have a certain distance, Therefore the temperature at arrival end wants much lower, also, when carrying out electromagnetic induction heating again at this time, the amplitude of variation of temperature is opposite to be subtracted Small, under conditions of a station heating time is constant, the rate of heat addition reduces very much.

Then molding die is made to heat liter in a short time with the higher rate of heat addition by second preheating station 12 Temperature to the softening point temperature not less than cover-plate glass makes molding die be heated to the softening point temperature of cover-plate glass as shown in Fig. 3 Degree or more, the actual temp being heated to adjusts between 700-800 DEG C according to the softening point and graphite size of cover-plate glass.

Make the temperature of the molding die 4 from the maximum temperature of the second preheating station 12 by the third preheating station 13 again Kept for a period of time after slowly dropping to the softening point temperature of cover-plate glass, as shown in Fig. 3, certainly, if pre- second Molding die is only heated to the softening point temperature of cover-plate glass by thermal technology position 12, then makes molding die at third preheating station 13 Directly it is maintained at the softening point temperature of cover-plate glass.

After electromagnetic induction heating, temperature distribution is non-uniform for molding die, and the regional temperature close to electromagnetic coil is higher, Separate position temperature is opposite to want low, i.e., there are temperature differences for the lip temperature of molding die and central temperature, therefore pre- in third When thermal technology position 13 carries out subsequent heat using resistance heating device, due to two tables of resistance heating device and molding die axial direction The case where position in face is more agreed with, and there is no deviations, therefore the upper and lower surface of molding die can be made integrally to be heated, to make The temperature distribution homogenization of molding die, and then each position thermally equivalent of cover-plate glass is made to reach softening point temperature, it avoids rear Because being locally not up to softening point position, hard stress causes cover-plate glass easily to damage by pressure and/or because of hot-spot in continuous pressing process And the case where leading to cover-plate glass excessive deformation appearance；Also, it is pre- in the first preheating station 11, the second preheating station 12 and third In 13 heating processes of thermal technology position, the upper heating module 62 does not apply pressure to molding die 4.

After warming, as shown in attached drawing 1, attached drawing 3, the molding die 4 equipped with cover-plate glass will also be through overmolding Station 2 suppresses and in cooling 3 cooling and shaping of station, and the molding station 2 includes at least one individual pressing station, preferably 3 and gap setting, each pressing station is all made of above-mentioned resistance heating device 6 and is heated, and keeps cover-plate glass In softening point temperature, while heating, the upper heating module 62 applies pressure to the cope plate of molding die 4, to make Cover-plate glass stress deformation.

The cooling station 3 keeps gap with the molding station 2, equally includes at least one individual bosher Position, preferably 3-4 and gap setting, each cooling station equally use resistance heating device 6 to carry out the cold of molding die 4 But, and the temperature of the resistance heating device 6 of each cooling station is lower than the temperature of molding die 4 and the electricity of multiple cooling stations Hinder the lapse of temperature of heating equipment 6；While cooling, each cooling station also applies cover-plate glass by upper heating module 62 Plus-pressure.

In whole process, as shown in Fig. 1, in order to realize molding die 4 successively in each station and in each station In each station between movement, the hot-bending machine further includes conveying equipment, and the conveying equipment can be known various forms And structure, in this programme preferably its include at least it is above-mentioned through the pre- thermal engineering station, molding station and cooling each station of station Loading plate and the toggle mechanism for driving the molding die to move on the supporting plate is provided at each station, described group Gap location of the motivation structure between adjacent stations comprising the cylinder that driving lever 7, the driving driving lever 7 are gone up and down (does not show in figure Out) and driving driving lever 7 translation mechanism that moves between station and be made of motor and lead screw (not shown)；It does not need to push away When sending molding die, the cylinder is in retracted mode, and the driving lever 7 is in retracted mode；When needing to push molding die, The telescopic shaft of the cylinder stretches out, and so that the driving lever is moved down into the side position of molding die, then the servo motor driven The lead screw drives the driving lever translation, realizes the push of mold.

Also, it is additionally provided on the hot-bending machine for being filled with nitrogen into hot-bending machine cavity to carry out molding die guarantor The nitrogen supply (NS) device of shield.

When using above-mentioned efficient 3D cover-plate glass hot bending machining, process is as follows:

S1, will equipped with cover-plate glass molding die 4 be placed in the first preheating station 11, by resistance heating device carry out at The heating of pattern tool 4 and cover-plate glass, does not apply pressure to cover-plate glass during heating.

S2 will be pushed into the second preheating station 12, at least by toggle mechanism by the molding die 4 of S1 step heating The heating that molding die is carried out by electromagnetic induction heating device 5 is increased to the temperature of molding die 4 not less than cover-plate glass Softening point temperature, preferably between 700-800 DEG C, during heating not to cover-plate glass apply pressure；In addition, in S2 step In, composite heating is further preferably carried out by electromagnetic induction heating device 5 and resistance heating device 6.

S3 will be placed in third preheating station 13 by the molding die 4 of S2 step heating by toggle mechanism, using resistance Heating equipment 6 heats molding die and cover-plate glass, makes the temperature of the molding die and cover-plate glass by S2 step The softening point temperature for homogenizing and maintaining cover-plate glass does not apply pressure to cover-plate glass during heating.

The molding die 4 preheated by pre- thermal engineering station 1 is successively placed in each compacting of molding station by toggle mechanism by S4 Station, in the softening point that each pressing station uses resistance heating device 6 that molding die 4 and cover-plate glass is made to be maintained at cover-plate glass Temperature applies pressure to cover-plate glass by upper heating module 62 simultaneously, and controls each pressing station and apply to cover-plate glass Pressure is between 600-1200KPa, and utility model people discovery is final to shape if the pressure applied is less than above range The bending degree of cover-plate glass be lower than standard requirements, conversely, when if more than above range, then the cover-plate glass finally shaped becomes Shape is excessive.

Molding die Jing Guo S4 step is placed in cooling station, applies pressure to cover-plate glass, and control pressure by S5 Between 300-600 KPa；Resistance heating device 6 while applying pressure by temperature lower than molding die makes cover board glass Glass forms after being cooled to room temperature.

Specifically, the temperature of each cooling station of the cooling station 3 tapers off trend, also, through overmolding station Into after cooling station, if the temperature of the resistance heating device of cooling station and the temperature gap in molding station are excessive at this time When, broken situation can occur under stress in cover-plate glass, and if temperature gap between the two is too small, cover-plate glass Cooling efficiency is slow, and utility model people is found through experiments that, when the resistance heating device of first cooling station in cooling station Temperature and cover-plate glass softening point temperature difference between 200 ± 10 DEG C when, optimal effect can be obtained.

Also, in whole process, control molding die 4 is identical in each station residence time, so as to Make the processing beat match of each station, processing while can be realized multiple products.Also, molding die stops each station The time parameter stayed is adjustable, and the time determines the slice efficiency of equipment, and under the premise of guaranteeing quality, the time is more short-acting Rate is higher.

Still there are many embodiment, all technologies formed using equivalents or equivalent transformation for the utility model Scheme is all fallen within the protection scope of the utility model.

Claims (8)

1. the preheating device of efficient 3D cover-plate glass, it is characterised in that: include at least and heated using electromagnetic induction heating device (5) The second preheating station (12) and positioned at its rear using the third preheating station (13) of resistance heating device (6) heating.

2. the preheating device of efficient 3D cover-plate glass according to claim 1, it is characterised in that: the electromagnetic induction heating The induction frequencies of equipment (5) are between 30kHz-80kHz, voltage 380VAC.

3. the preheating device of efficient 3D cover-plate glass according to claim 1, it is characterised in that: second preheating station (12) composite heating is carried out using electromagnetic induction heating device (5) and resistance heating device (6).

4. the preheating device of efficient 3D cover-plate glass according to claim 1, it is characterised in that: second preheating station (12) front end is additionally provided with the first preheating station (11) heated using resistance heating device (6).

5. the preheating device of efficient 3D cover-plate glass according to claim 1 to 4, it is characterised in that: the resistance adds Hot equipment (6) includes the fixed lower heating module (61) and liftable upper heating module (62) in position, the lower heating module (61) and upper heating module (62) includes the heat block (602) for being built-in with resistor rod heating tube (601), the heat block (602) side backwards to molding die (4) is provided with heat-proof device (603), and the heat-proof device (603) connects radiator (604), the driving device of its lifting of radiator (604) the connection driving of the upper heating module (62).

6. the preheating device of efficient 3D cover-plate glass according to claim 5, it is characterised in that: the heat-proof device It (603) is to be contacted with heat block (602) line and/or the body of stainless steel of Multi-contact or superalloy body, the radiator It (604) is the cooling equipment for using coolant liquid.

7. efficient 3D cover-plate glass hot-bending machine, including pre- thermal engineering station (1), molding station (2), cooling station (3) and for making into Pattern has (4) successively conveying equipment Jing Guo each station, it is characterised in that: further includes efficient described in claim 1-6 any The preheating device of 3D cover-plate glass.

8. efficient 3D cover-plate glass hot-bending machine according to claim 7, it is characterised in that: the molding station (2) uses The resistance heating device (6) is heated, and molding die (4) is made to be maintained at softening point temperature；The cooling station (3) is adopted Resistance heating device (6) with temperature lower than molding die realizes cooling.