CN113233744B - Hot bending method and hot bending equipment - Google Patents

The hot bending method and the hot bending equipment provided by the disclosure comprise the following steps: providing a plane glass; at least one edge of the plane glass is subjected to downward hot bending to form a curved surface part, and the radian of the curved surface part is larger than 90 degrees and smaller than or equal to 180 degrees; and thermally bending the curved surface part, so that the curved surface part is turned over from the lower part of the plane where the plane part which is not thermally bent in the plane glass is located to the upper part of the plane where the plane part is located, and is tangent to the plane part.

Hot bending method and hot bending equipment

Technical Field

The disclosure relates to the technical field of hot bending processes, in particular to a hot bending method and hot bending equipment.

Background

The glass cover plate is the protective glass, and along with the upgrading of product requirements, the market also has higher and higher requirements on the glass cover plate. At present, the market generally divides the glass cover 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 (2.5D glass cover plate) or a curved surface (3D glass cover plate), and the edge part of the glass cover plate adopts curved surface transition. The non-planar glass cover plate has the advantages that the appearance attractiveness of products is greatly improved, the experience of a user in touch screen operation is improved, and therefore the non-planar glass cover plate is widely applied to intelligent electronic products such as smart phones, tablet computers and smart watches.

For a curved glass cover plate with a large angle (the radian is larger than 90 degrees and less than or equal to 180 degrees), the glass cover plate is manufactured by adopting a twice hot bending process in the related technology. Specifically, in the first hot bending process, the edge of the plane glass is hot bent into a right-angled wall with a radian equal to 90 °, as shown in fig. 1; in a second hot bending pass, the right angle wall is hot bent from a 90 ° to a 180 ° curved surface, as shown in fig. 2. Due to the fact that the bending angle of the right-angle wall is too large in the second hot bending process, the tolerance of the profile tolerance of the 90-degree curved surface (namely the position A) formed by the first hot bending is increased, serious deformation occurs, and light shadow is not straight.

Disclosure of Invention

The embodiment of the disclosure provides a hot bending method and hot bending equipment, which are used for solving the problem of poor curved surface profile caused by two times of hot bending.

Therefore, an embodiment of the present disclosure provides a hot bending method, including:

providing a plane glass;

hot-bending at least one edge of the plane glass downwards to form a curved surface part, wherein the radian of the curved surface part is more than 90 degrees and less than or equal to 180 degrees;

and thermally bending the curved surface part, so that the curved surface part is turned over from the lower part of the plane where the plane part which is not thermally bent in the plane glass is located to the upper part of the plane where the plane part is located, and is tangent to the plane part.

Optionally, in the above hot bending method provided in an embodiment of the present disclosure, the hot bending at least one edge of the planar glass downward to form a curved surface portion specifically includes:

and carrying out downward hot bending on opposite edges of the plane glass to form two curved surface parts, wherein the radian of the curved surface parts is more than 90 degrees and less than or equal to 180 degrees.

Optionally, in the above hot bending method provided by the embodiment of the present disclosure, while forming the curved surface portion, the method further includes:

and an inclined part tangent to the curved surface part is formed on one side of the curved surface part far away from the plane part.

Optionally, in the above thermal bending method provided by the embodiment of the present disclosure, after forming the curved surface portion and the inclined portion, the method further includes:

and carrying out hot bending on the inclined part, so that the inclined part and the plane part are arranged in parallel to obtain the inverted buckle type curved glass.

Based on the same inventive concept, the embodiment of the present disclosure further provides a hot bending apparatus, including:

the first set of hot bending die is used for carrying out downward hot bending on at least one edge of the plane glass to form a curved surface part, and the radian of the curved surface part is larger than 90 degrees and smaller than or equal to 180 degrees;

and the second set of hot bending die is used for turning the curved surface part from the lower part of the plane part which is not subjected to hot bending in the plane glass to the upper part of the plane part, and enabling the curved surface part to be tangent to the plane part.

Optionally, in the above hot bending apparatus provided by the embodiment of the present disclosure, the first set of hot bending dies is further configured to form an inclined portion tangent to the curved surface portion on a side of the curved surface portion away from the planar portion.

Optionally, in the above hot bending apparatus provided in the embodiment of the present disclosure, the apparatus further includes: and the third set of hot bending die is used for controlling the inclined part to be parallel to the plane part to obtain the inverted buckle type curved glass.

Optionally, in the above hot bending apparatus provided in this disclosure, the first set of hot bending dies includes:

the first mold comprises a first accommodating groove, the surface of the first accommodating groove comprises a first plane structure, a first inclined plane structure and a first concave surface structure, the first inclined plane structure is located on two opposite sides of the first plane structure, the first concave surface structure is connected with the first plane structure and the first inclined plane structure, the radian of the first concave surface structure is larger than 90 degrees and smaller than or equal to 180 degrees, and the first inclined plane structure extends towards the direction far away from the first concave surface structure;

the second mold comprises a second accommodating groove, the surface of the second accommodating groove comprises a second plane structure, a second inclined plane structure and a first convex surface structure, the second inclined plane structure is located on two opposite sides of the second plane structure, the first convex surface structure is connected with the second plane structure and the second inclined plane structure, the shape of the second plane structure is similar to that of the first plane structure, the first convex surface structure and the first concave surface structure are matched with each other, and the shape of the second inclined plane structure is similar to that of the first inclined plane structure.

Optionally, in the above hot bending apparatus provided in this disclosure, the second set of hot bending dies includes:

a third mold, including a third receiving groove, a surface of the third receiving groove including a third planar structure, a third inclined structure and a step structure, where the third inclined structure is located at two opposite sides of the third planar structure, the step structure connects the third planar structure and the third inclined structure, the third inclined structure extends toward a direction away from one side of the step structure, the step structure includes a second concave structure and a third concave structure, the second concave structure is tangent to the third planar structure, the third concave structure is tangent to the third inclined structure, a radian of the second concave structure is 90 °, and a radian of the third concave structure is greater than 0 ° and less than or equal to 90 °;

the fourth mould, including protruding structure, the surface of protruding structure includes fourth planar structure, second convex surface structure and fourth inclined plane structure, fourth inclined plane structure is in orthographic projection on the fourth mould place plane with the relative edge of fourth planar structure is in orthographic projection on the fourth mould place plane overlaps each other, just fourth inclined plane structure is located fourth planar structure place planar top, second convex surface structural connection the fourth planar structure with fourth inclined plane structure, the radian of second convex surface structure equals the radian of second concave surface structure with the radian sum of third concave surface structure, fourth inclined plane structure with second convex surface structure is tangent.

Optionally, in the above hot bending apparatus provided in this disclosure, the third set of hot bending dies includes:

the surface of the fifth accommodating groove comprises a fifth plane structure and a fourth concave structure, wherein the fourth concave structure is positioned at two opposite sides of the fifth plane structure, and the radian of the fourth concave structure is 90 degrees;

a sixth mold, including a sixth receiving groove, a surface of the sixth receiving groove including a sixth planar structure and a fifth concave structure, wherein the fifth concave structure is located on two opposite sides of the sixth planar structure, a shape of the sixth planar structure is similar to a shape of the fifth planar structure, and a shape of the fifth concave structure is similar to a shape of the fourth concave structure;

and the seventh mold is positioned in an accommodating space formed by the fifth accommodating groove and the sixth accommodating groove, the surface of the seventh mold comprises a seventh plane structure and a third convex surface structure, wherein the third convex surface structure is positioned on two opposite sides of the seventh plane structure, and the radian of the third convex surface structure is greater than 90 degrees and less than or equal to 180 degrees.

Optionally, in the above hot bending apparatus provided by the embodiment of the present disclosure, the seventh mold includes a first sub-mold, a second sub-mold, and a third sub-mold, where the first sub-mold and the third sub-mold are located on opposite sides of the second sub-mold;

the third convex surface structure is the surface of one side of the first sub-mold, which is far away from the second sub-mold, or the surface of one side of the third sub-mold, which is far away from the second sub-mold;

the seventh plane structure comprises a surface of the first sub-mold facing one side of the fifth accommodating groove, a surface of the second sub-mold facing one side of the fifth accommodating groove, and a surface of the third sub-mold facing one side of the fifth accommodating groove.

Optionally, in the hot bending apparatus provided in this disclosure, the first mold further includes a first clamping groove and a second clamping groove, the first clamping groove and the second clamping groove are respectively located at two opposite sides of the first accommodating groove, and the first clamping groove, the second clamping groove, and the first accommodating groove are relatively independently arranged;

the second mold further comprises a third clamping groove and a fourth clamping groove, the third clamping groove and the fourth clamping groove are respectively positioned at two opposite sides of the second accommodating groove, and the third clamping groove, the fourth clamping groove and the second accommodating groove are integrally arranged;

the first clamping groove and the second clamping groove are used for accommodating the edge of the second mold, and the third clamping groove and the fourth clamping groove are used for accommodating the first mold between the first clamping groove and the first accommodating groove and between the second clamping groove and the first accommodating groove.

Optionally, in the hot bending apparatus provided in the embodiment of the present disclosure, the third mold further includes a fifth clamping groove and a sixth clamping groove, the fifth clamping groove and the sixth clamping groove are respectively located at two opposite sides of the third accommodating groove, and the fifth clamping groove, the sixth clamping groove, and the third accommodating groove are relatively independently arranged;

the fourth mold further comprises a seventh clamping groove and an eighth clamping groove, and the seventh clamping groove and the eighth clamping groove are respectively positioned at two opposite sides of the protruding structure;

the fifth card slot and the sixth card slot are used for accommodating the edge of the fourth mold, and the seventh card slot and the eighth card slot are used for accommodating the third mold between the fifth card slot and the third accommodating groove and between the sixth card slot and the third accommodating groove.

Optionally, in the hot bending apparatus provided in this disclosure, the fifth mold further includes a ninth locking groove and a tenth locking groove, the ninth locking groove and the tenth locking groove are respectively located above two opposite sides of the third receiving groove, and the ninth locking groove, the tenth locking groove and the fifth receiving groove are integrally formed;

the sixth mold further comprises an eleventh clamping groove and a twelfth clamping groove, the eleventh clamping groove and the twelfth clamping groove are respectively located on two opposite sides of the sixth accommodating groove, and the eleventh clamping groove, the twelfth clamping groove and the sixth accommodating groove are arranged relatively independently;

the ninth slot and the tenth slot are used for accommodating the fifth mold between the eleventh slot and the sixth receiving slot and between the twelfth slot and the sixth receiving slot, and the eleventh slot and the twelfth slot are used for accommodating the edge of the sixth mold.

The beneficial effects of this disclosure are as follows:

the hot bending method and the hot bending equipment provided by the embodiment of the disclosure comprise the steps of providing plane glass; at least one edge of the plane glass is subjected to downward hot bending to form a curved surface part, and the radian of the curved surface part is larger than 90 degrees and smaller than or equal to 180 degrees; and thermally bending the curved surface part, so that the curved surface part is turned over from the lower part of the plane part which is not thermally bent in the plane glass to the upper part of the plane part and is tangent to the plane part. In the present disclosure, the profile tolerance of a curved surface portion has been determined by hot-bending at least one edge of a flat glass downward to form the curved surface portion having a radian greater than 90 ° and less than or equal to 180 °; in the process of thermally bending the curved surface part, the curved surface part is turned over from the lower part of the plane part to the upper part of the plane part and is tangent to the plane part, only the position change of the curved surface part is involved, and the change of the bending degree of the curved surface part is not involved, so that the profile degree of the curved surface part is not influenced. Therefore, compared with the technical scheme that the two hot bends influence the profile of the curved surface part in the related art, the two hot bending process can reduce the profile tolerance of the curved surface part, and is beneficial to keeping the dimension stability of the profile of the curved surface part.

Drawings

FIG. 1 is a schematic view of a curved glass after a first hot bending in the related art;

FIG. 2 is a schematic view of curved glass after a second hot bending in the related art;

FIG. 3 is a flow chart of a hot bending method provided by an embodiment of the present disclosure;

FIG. 4 is a schematic view of curved glass after three hot bends provided by embodiments of the present disclosure;

fig. 5 is a schematic structural diagram of a hot bending apparatus provided in an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a first set of hot-bending dies provided in accordance with an embodiment of the present disclosure;

FIG. 7 is a schematic view of a first set of hot bending dies after hot bending processing according to an embodiment of the disclosure;

FIG. 8 is a schematic view of a second set of hot bending dies provided in accordance with an embodiment of the present disclosure;

FIG. 9 is a schematic view of a second set of hot bending dies after a hot bending process is performed according to an embodiment of the disclosure;

fig. 10 is a schematic structural view of a third set of hot-bending dies provided by the embodiment of the disclosure;

FIG. 11 is a schematic view of a third set of hot bending molds after being subjected to hot bending treatment according to an embodiment of the present disclosure;

fig. 12 is a schematic structural view of an inverted buckle type curved glass provided in the embodiment of the present disclosure.

Reference numerals:

01-first set of hot bending die, 101-first die, 102-second die, 02-second set of hot bending die, 201-third die, 202-fourth die, 03-third set of hot bending die, 301-fifth die, 302-sixth die, 303-seventh die, 3031-first sub-die, 3032-second sub-die, 3033-third sub-die, a-plane portion, b-curved surface portion, c-slope portion, a ₁ -a first planar structure, b ₁ -a first concave structure, c ₁ -a first ramp structure, a ₂ A second planar structure, b ₂ A first convex structure, c ₂ A second ramp structure, a ₃ -a third planar structure, b ₃ A step surface structure, c ₃ -a third ramp structure, a ₄ A fourth planar structure, b ₄ A second convex structure, c ₄ A fourth ramp structure, a ₅ A fifth planar structure, b ₅ -a fourth concave structure, a ₆ A sixth planar structure, b ₆ A fifth concave structure, a ₇ A seventh planar structure, b ₇ -a third convex structure, K ₁ -a first card slot, K ₂ -a second card slot, K ₃ -a third card slot, K ₄ -a fourth card slot, K ₅ A fifth card slot, K ₆ -a sixth card slot, K ₇ -a seventh card slot, K ₈ An eighth card slot, K ₉ -a ninth card slot, K ₁₀ -a tenth card slot, K ₁₁ -an eleventh card slot, K ₁₂ -a twelfth card slot.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the various figures in the drawings are not to scale, but are merely intended to illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "inner", "outer", "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

A hot bending method provided in an embodiment of the present disclosure, as shown in fig. 3 and 4, may include the following steps:

s301, providing plane glass;

s302, at least one edge of the plane glass is subjected to downward hot bending to form a curved surface part b, and the radian of the curved surface part b is larger than 90 degrees and smaller than or equal to 180 degrees;

and S303, carrying out hot bending on the curved surface part b, turning the curved surface part b from the lower part of the plane where the plane part a is not subjected to hot bending in the flat glass to the upper part of the plane where the plane part a is positioned, and tangent to the plane part a, so that the plane part a and the curved surface part b are determined to be well jointed and have no poor appearance.

In the above-described hot bending method provided by the embodiment of the present disclosure, the profile tolerance of the curved surface portion b has been determined by hot-bending at least one edge of the flat glass downward to form the curved surface portion b having a radian greater than 90 ° and less than or equal to 180 °; in the process of thermally bending the curved surface part b to enable the curved surface part b to be turned over from the lower side of the plane of the flat surface part a to the upper side of the plane of the flat surface part a to be tangent with the flat surface part a, only the position of the curved surface part b is changed, and the change of the bending degree of the curved surface part b is not involved, so that the profile degree of the curved surface part b is not influenced. Therefore, compared with the technical scheme that the two hot bends influence the profile of the curved surface part b in the related art, the profile tolerance of the curved surface part b can be reduced, and the stability of the profile size of the curved surface part b is favorably maintained.

It should be noted that after the step S302 is performed and at least one edge of the flat glass is subjected to the downward hot bending to form the curved surface portion b, it is determined that the profile tolerance of the curved surface portion b may be ± 0.15mm (the profile tolerance of the two hot bending processes in the related art may be ± 0.3 mm), and the minimum rounded corner (i.e., the R-angle) may range from 3mm to 6mm.

In some embodiments, in the above-mentioned thermal bending method provided by the embodiments of the present disclosure, the step S302 of thermally bending at least one edge of the planar glass downward to form the curved surface portion b may be specifically implemented by:

the opposite edges of the flat glass are subjected to downward hot bending to form two curved surface parts b, the radian of the curved surface parts b is larger than 90 degrees and smaller than or equal to 180 degrees, namely the curved glass with the middle part being a flat surface part a and the opposite sides being bent is formed, as shown in fig. 4.

In some embodiments, in the above-mentioned hot bending method provided by the embodiments of the present disclosure, in the above-mentioned step S302, while forming the curved surface portion b, the following steps may also be performed:

on the side of the curved surface portion b away from the flat surface portion a (i.e., the middle region of the flat glass), an inclined portion c is formed which is tangent to the curved surface portion b. That is, a curved glass having a flat surface portion a in the middle, curved surface portions b on opposite sides of the flat surface portion a, and inclined portions c on the outermost sides in contact with the curved surface portions b is formed as a flat glass, as shown in fig. 4.

In some embodiments, in the above hot bending method provided by the embodiments of the present disclosure, the step of: after the curved surface portion b and the inclined portion c are formed, the following steps may be further performed:

the inclined portion c is thermally bent so that the inclined portion c is disposed in parallel with the planar portion a, and a curved glass of a flip-chip type is obtained, as shown in fig. 4.

This step involves only press-bending the inclined portion c so that the contour degree of the inclined portion c as the reversed part meets the requirement, and therefore the contour degree of the curved surface portion b is not affected. Alternatively, the length of the inclined portion c as the reversed portion may be less than or equal to 1/2 of the length of the planar portion a. In some embodiments, the length of the slope part c as the undercut part may be 0-5mm.

Based on the same inventive concept, the embodiment of the present disclosure provides a hot bending apparatus, and because the principle of the hot bending apparatus to solve the problem is similar to the principle of the hot bending method to solve the problem, the implementation of the hot bending apparatus provided by the embodiment of the present disclosure may refer to the implementation of the hot bending method provided by the embodiment of the present disclosure, and repeated details are omitted.

Specifically, the embodiment of the present disclosure further provides a hot bending apparatus, as shown in fig. 5, which may include:

the first set of hot bending die 01 is used for carrying out downward hot bending on at least one edge of the plane glass to form a curved surface part, and the radian of the curved surface part is larger than 90 degrees and smaller than or equal to 180 degrees;

and the second set of hot bending die 02 is used for turning the curved surface part from the lower part of the plane where the plane part which is not hot bent in the plane glass is located to the upper part of the plane where the plane part is located, and enabling the curved surface part to be tangent to the plane part.

In some embodiments, in the above-mentioned hot bending apparatus provided in the embodiments of the present disclosure, the first set of hot bending dies 01 may also be configured to form an inclined portion tangent to the curved surface portion on a side of the curved surface portion away from the planar portion.

In some embodiments, in the above hot bending apparatus provided in the embodiments of the present disclosure, as shown in fig. 5, the hot bending apparatus may further include: and the third set of hot bending die 03 is used for controlling the inclined part to be parallel to the plane part to obtain the inverted buckle type curved glass.

In some embodiments, in the above hot bending apparatus provided by the embodiments of the present disclosure, as shown in fig. 6, the first set of hot bending dies 01 may include:

Note that, the first convex structure b ₂ And the first concave structure b ₁ The mutual cooperation sets up specifically to indicate: first concave structure b ₁ Is located in the area of the first convex structure b ₂ The area is slightly larger, and the first concave structure b is formed during the hot bending process ₁ Can accommodate the first convex structure b ₂ And the middle gap after the two are matched can at least accommodate the thickness of the curved glass.

In addition, "similar" in the present disclosure may be completely equivalent or may have some deviation due to the limitation of process conditions or the influence of other factors such as measurement, and therefore, the relationship of "similar" between different features is within the protection scope of the present disclosure as long as the relationship meets the allowance of error (for example, the upper and lower 10% of fluctuation).

In some embodiments, in the above hot bending apparatus provided by the embodiments of the present disclosure, as shown in fig. 8, the second set of hot bending dies 02 may include:

seventh planar structure a ₇ A surface of the first sub-mold 3031 facing the fifth receiving groove side, a surface of the second sub-mold 3032 facing the fifth receiving groove side, and a surface of the third sub-mold 3033 facing the fifth receiving groove side may be included.

It should be noted that, the first card slot K is provided ₁ To the twelfth card slot K ₁₂ For effecting tightness between opposite dies of each set of hot bending diesAnd a press-fit, and thus its specific shape may not be limited.

It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.