CN214528698U

CN214528698U - Hot bending die

Info

Publication number: CN214528698U
Application number: CN202120571857.4U
Authority: CN
Inventors: 邱海浪
Original assignee: Lens Technology Co Ltd
Current assignee: Lens Technology Co Ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2021-10-29
Anticipated expiration: 2031-03-19

Abstract

The utility model discloses a hot bending mould, which comprises a mould base body made of heat conducting material, wherein the mould base body is provided with an arc surface part and a fixing part which are arranged in a protruding way; the fixing piece is arranged at the edge of the cambered surface part in a protruding mode. The curvature radian of the cambered surface part in the hot bending mould provided by the utility model corresponds to the curvature radian required by the product, and after the product is heated to a proper temperature, the product can be softened and naturally bent towards the cambered surface part under the action of gravity; the outer edge of the product is contacted with the fixing piece, so that the position of the outer edge of the product can be limited, and the control on the profile tolerance of the product is realized; therefore, the hot bending forming of the product can be completed by using one mold, the contact between the upper surface of the product and the mold is avoided, the pressure can not be applied to the upper surface of the product, and the center of the product can be effectively prevented from being deformed and imprinted.

Description

Hot bending die

Technical Field

The utility model relates to a hot bending former technical field, more specifically say, relate to a hot bending mould.

Background

In the prior art, in the process of bending and deforming a large-size 3D hot bending product, both simple single bending and complex four-side bending adopt a mode of matching an upper die and a lower die to press and form the product; because the upper die is arranged at the upper part of the product, the central area of the product is deformed, and the stamping is easy to occur.

The stamping is generally that under the condition of high temperature of a mold, the upper surface of a product is contacted with an upper mold, and the product is pressed by forming pressure to cause local deformation of the product. Once the imprint occurs, the subsequent process is often difficult to sweep away, or some products cannot be swept away, and the imprint is more difficult to remove.

In summary, those skilled in the art need to solve the above problems how to avoid deformation and imprint in the central region during hot bending of the product.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a hot-bending die, only need set up a mould base member, need not to set up the mould, at the in-process that uses, avoid the upper surface of product and last mould contact, can effectively avoid central zone deformation to appear and produce the impression.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a hot-bending die, includes heat conducting material's mould base member, the mould base member has the cambered surface portion and the mounting that the protrusion set up, the mounting protrusion set up in the edge of cambered surface portion.

Preferably, the outer surface of the cambered surface part is provided with a smooth coating, and the coating completely covers the cambered surface part.

Preferably, the coating is a rare earth oxide coating.

Preferably, the fixing pieces are arranged on two sides of the arc surface portion.

Preferably, the fixing piece is of a columnar structure, a smooth coating is arranged on the surface of the fixing piece, and the coating completely covers the peripheral side face of the fixing piece.

Preferably, the fixing member is continuously disposed along an edge of the arc surface portion and forms a closed loop.

Preferably, the mold base is a cast iron mold base.

Preferably, the cast iron mold base is cast by cast iron which is placed for more than three years.

Preferably, the mold further includes a seal cover provided to cover an outer peripheral portion of the mold base, and the seal cover is sealingly connected to the mold base.

Preferably, the sealing cover is a high-temperature-resistant sealing cover.

In the process of using the hot bending die provided by the utility model, firstly, a product waiting for hot bending forming is placed on the upper part of the cambered surface part, and the outer edge of the product is contacted with the fixing part so as to limit the position of the outer edge of the product; then placing the hot bending die with the product into a furnace body, heating the product and the hot bending die, wherein the die base body is made of a heat conducting material, so that the temperature of the arc surface part and the temperature of the product can be increased in the heating process until the temperature of the arc surface part is increased to a proper temperature, the product is softened at the moment and naturally attached to the arc surface part to be bent under the self gravity to form a bent shape matched with the arc surface part, and after the product is subjected to hot bending forming; stopping heating to cool the product, and taking out the product after cooling to obtain the product with the required bending radian.

Compared with the prior art, the utility model provides a curved surface portion's in the hot-bending mould bending radian corresponds with the required bending radian of product, and after heating to suitable temperature, the product can soften, and under the effect of gravity, the edge of product moves downwards in order to paste the curved surface portion bending, forms required radian; the outer edge of the product is contacted with the fixing piece, so that the position of the outer edge of the product can be limited, and the control on the profile tolerance of the product is realized; therefore, the hot bending forming of the product can be completed by using one mold, the contact between the upper surface of the product and the mold is avoided, the pressure can not be applied to the upper surface of the product, and the center of the product can be effectively prevented from being deformed and imprinted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a hot bending mold according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the hot-bending die of FIG. 1 without a sealing cap;

FIG. 3 is a top view of the hot bending die of FIG. 2;

fig. 4 is a schematic sectional view taken along the direction a-a in fig. 3.

In fig. 1 to 4:

1 is a mould base body, 2 is an arc surface part, 3 is a fixing part, 4 is a sealing cover, and 5 is hot bending glass.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a hot-bending die, only need set up a mould base member, need not to set up the mould, at the fashioned in-process of hot-bending, the upper surface of product can not receive pressure, does not also have the upper surface contact of mould and product, can effectively avoid the appearance of impression, also can avoid central zone deformation to appear.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a hot bending mold according to an embodiment of the present invention; FIG. 2 is a schematic structural view of the hot-bending die of FIG. 1 without a sealing cap;

FIG. 3 is a top view of the hot bending die of FIG. 2; fig. 4 is a schematic sectional view taken along the direction a-a in fig. 3.

The application document provides a hot bending die, which is made of cast iron, a single die base body 1 is used, and a fixing piece 3 is arranged at the edge of an arc surface part 2 of the die base body 1 to limit the profile degree of a product; and heating the product to a proper temperature, and naturally bending the product until the product is attached to the surface of the cambered surface part 2 to finish hot bending forming.

It should be noted that the hot bending mold in the present application can be applied to the hot bending molding operation of the automobile glass with a simpler shape, a smaller peripheral arch height and a smaller spherical surface requirement, and can also be applied to the hot bending molding of the front windshield glass of a locomotive with a larger peripheral arch height (the suspension distance between the periphery of the glass and the mold molding ring is 50 mm-200 mm when the glass is mounted on a conventional hot bending mold), and a higher corner spherical surface requirement; the hot bending forming die can also be applied to hot bending forming of products made of other materials, and is determined according to actual conditions.

When a conventional hot bending die in the prior art is used for hot bending and forming high-speed locomotive glass, under the glass deformation temperature, front windshield glass of the high-speed locomotive can be attached to a die from the middle of the periphery to the corner part, and the corner part of the glass is finally attached to the die; in the process of hot bending, the glass at the corner part of the hot bending die cannot form an independent gravity center earlier, the gravity of the glass at the position is insufficient, the glass deformation is insufficient, the spherical transition of the corner part of the hot-bent formed glass is unsmooth, even the phenomena of reverse spherical surface, poor optics, lotus leaf edges, corner warping and the like occur, and the problems of cracking, cementing layer bubbles and the like easily occur in the subsequent sheet combining process.

At the in-process that uses the hot bending mould of this application to carry out the hot bending shaping to locomotive glass, after the locomotive glass is heated and softens, can be under the effect of gravity the natural bending to the position with 2 laminating of cambered surface portion, after locomotive glass and 2 laminating of cambered surface portion, its each position all with 2 contacts of cambered surface portion, it is even to be heated, consequently, can avoid the insufficient condition of corner position deformation, the completion is to the hot bending shaping of locomotive glass.

This concrete embodiment provides a hot-bending die, including heat conducting material's mould base member 1, the surface protrusion of mould base member 1 is provided with cambered surface portion 2, and the protrusion in the edge of cambered surface portion 2 is provided with mounting 3, and the direction of height of mounting 3 has the extension of the upper portion plane of perpendicular to mould base member 1.

The arc surface portion 2 mentioned here has thermal conductivity so as to transfer heat to the product, so that the product is softened by heating.

The above-mentioned aspect that the fixing member 3 has an extension perpendicular to the upper plane of the die base 1 in the height direction means that, as shown in fig. 1, the upper surface of the die base 1 is provided with a plane portion and an arc portion 2, and the fixing member 3 may be provided perpendicular to the plane portion as shown in fig. 4; the upper end of the fixing part 3 can be inclined towards the outer side of the cambered surface part 2 relative to the vertical direction, and is determined according to the actual situation.

The fixing member 3 may be a continuous and closed ring structure disposed around the arc portion 2 to better limit the edge shape of the hot-bent glass 5, or may be a non-closed structure disposed at intervals around the arc portion 2, which is determined according to actual conditions.

In the process of using the hot bending die provided by the present embodiment, it is first necessary to place a product to be hot-bent on the upper portion of the arc surface portion 2 and make the outer edge of the product contact with the fixing member 3 so as to limit the position of the outer edge of the product; then placing the hot bending die with the product into a furnace body, heating the product and the hot bending die, wherein the die base body 1 is made of a heat conducting material, so that the temperature of the arc surface part 2 and the temperature of the product are increased in the heating process until the temperature of the product is increased to a proper temperature, the product is softened at the moment and naturally attached to the arc surface part 2 to be bent under the self gravity to form a bent shape matched with the arc surface part 2, and after the product is subjected to hot bending forming; stopping heating to cool the product, and taking out the product after cooling to obtain the product with the required bending radian.

The product in this embodiment may be a hot-bent glass 5, or may be made of other materials that can be hot-bent.

It should be noted that, in the process of attaching to the arc surface portion 2 after the product is softened, due to the highest point contact between the product and the arc surface portion 2, after the product is softened, the portion of the product located at the periphery of the highest point of the arc surface portion 2 is gradually attached to and drawn close to the arc surface portion 2, and under the condition of proper operation, no bubble or gap exists between the product and the arc surface portion 2 after the product is attached to the arc surface portion 2.

Compared with the prior art, the curvature of the arc surface part 2 in the hot bending die provided by the embodiment corresponds to the curvature required by the product, the product can be softened after being heated to a proper temperature, and the edge of the product moves downwards under the action of gravity to be adhered to the arc surface part 2 to be naturally bent to form the required curvature; the position of the outer edge of the product can be limited due to the fact that the outer edge of the product is in contact with the fixing piece 3, and control over the profile degree of the product is achieved; therefore, the hot bending forming of the product can be completed by using one mold, the contact between the upper surface of the product and the mold is avoided, the pressure can not be applied to the upper surface of the product, and the center of the product can be effectively prevented from being deformed and imprinted.

On the basis of the above embodiment, in order to further improve the surface quality of the hot-bending formed product, a smooth coating may be provided on the outer surface of the arc surface portion 2, and the coating completely covers the arc surface portion 2.

It should be noted that the coating mentioned in this document is a rare earth oxide coating, has oxidation resistance and thermal conductivity, can be heated repeatedly, and has a long service life.

Since the fixing member 3 is in contact with the edge of the product, a smooth coating may be provided on the surface of the fixing member 3, the coating completely covering the outer circumferential side of the fixing member 3.

After the coating is arranged, the surface of the hot bending die contacted with the product is smoother, the surface roughness of the product after hot bending forming is reduced, pockmarks or pits are prevented from appearing on the surface of the product after hot bending forming, the demoulding process is more convenient, and the service life of the die is prolonged.

The processing procedure of the coating is as follows: firstly, carrying out ultrasonic cleaning pretreatment on the surface of a part to be coated with a coating, mainly for removing oil stains and avoiding the influence of the oil stains on the next step; secondly, performing sand blasting treatment on the surface after ultrasonic cleaning to remove rust on the surface; thirdly, spraying a ceramic coating on the surface subjected to sand blasting treatment, wherein the ceramic coating is a special rare earth oxide; fourthly, carrying out high-temperature curing treatment on the ceramic coating; and fifthly, performing coating post-treatment, and mainly cleaning the coating.

The fixing member 3 may be provided as a cylindrical structure, and both sides of the arc surface portion 2 are provided with the fixing member 3. Here, two sides of the arc surface portion 2 may be opposite sides of the edge of the arc surface portion 2, and when the edge of the arc surface portion 2 is in an irregular shape, the setting position of the fixing member 3 needs to be determined according to an actual situation; a plurality of mounting holes for mounting the fixing elements 3 can also be provided in the mold base 1, with which the fixing elements 3 can be detachably connected, so that the fixing elements 3 can be selectively connected to the mounting holes in a corresponding manner in different situations.

It should be noted that, in the hot bending process, the temperature setting is very critical, and the product is heated to be softened, but the product can not flow, and at this moment, the product is just softened, and the edge of the product can be attached to the arc surface part 2 under the action of gravity, but the edge of the product can not be wrinkled in the process of being attached to the arc surface part 2.

In order to simplify the structure of the mold base 1 and make the fixing and placing processes of the product more convenient, when the arc surface portion 2 is in a strip structure, the fixing members 3 may be disposed at positions close to both ends of the arc surface portion 2 in the length direction, as shown in fig. 1, the fixing members 3 are not disposed at the middle portion of the arc surface portion 2 in the length direction. Of course, the setting position of the fixing member 3 can be determined according to the actual situation according to the change of the shape of the arc-shaped surface portion 2 in the actual situation.

On the basis of above-mentioned embodiment, can set up mould base member 1 into cast iron mould base member, compare the graphite material among the prior art, the mould base member of the cast iron material that this application file provided can heat repeatedly and use, prolongs the life of mould, reduces mould cost.

Because the cast iron just processed contains more gas, the cast iron can be placed for 3-5 years, and after the cast iron is placed for 3-5 years, the internal gas can be obviously reduced, so that the heat conduction effect and the surface forming quality of the hot bending die are prevented from being influenced.

In addition to the above embodiments, in order to avoid the influence of impurities such as dust in the air on the hot bending forming quality of the product, the mold base may further include a sealing cover 4 disposed on the outer peripheral portion of the mold base 1, and the sealing cover 4 may be hermetically connected to the mold base 1, may be hermetically connected to the outer peripheral side surface of the mold base 1, or may be hermetically connected to the upper surface of the mold base 1. And the sealing cap 4 does not come into contact with the upper surface of the product during use.

The sealing cover 4 is arranged, so that in the hot bending forming process, a product is in a closed space, and the influence of impurities in the air on the surface quality of the product is avoided.

The sealing cover 4 can be configured to be matched with the shape and size of the mold base 1, and in the using process, as shown in fig. 1, the sealing cover 4 can be directly buckled on the mold base 1 and connected with the mold base 1 in a sealing manner.

Without the sealing cover 4, the mold base 1 may be placed in a closed box space for hot bending molding, which is determined according to actual conditions.

The temperature is high in the hot bending forming process, so that the sealing cover 4 is made of high-temperature-resistant materials.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

The hot bending die provided by the utility model is described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The utility model provides a hot-bending die, its characterized in that, includes heat-conducting material's mould base member (1), mould base member (1) has cambered surface portion (2) and mounting (3) that the protrusion set up, mounting (3) protrusion set up in the edge of cambered surface portion (2).

2. Mould according to claim 1, characterized in that the outer surface of the curved surface portion (2) is provided with a smooth coating which completely covers the curved surface portion (2).

3. The hot bend die of claim 2, wherein the coating is a rare earth oxide coating.

4. A hot-bending mould according to any one of claims 1-3, wherein the fixing members (3) are provided on both sides of the curved surface portion (2).

5. Mould according to claim 4, characterized in that the fixing elements are cylindrical structures, and the surface of the fixing elements (3) is provided with a smooth coating which completely covers the peripheral side of the fixing elements (3).

6. A hot-bending mould according to any one of claims 1 to 3, wherein the fixing member (3) is arranged continuously along the edge of the curved surface portion (2) and forms a closed loop.

7. A hot-bending mould according to any one of claims 1-3, wherein the mould base body (1) is a cast iron mould base body.

8. A hot-bending mould according to claim 7, wherein the cast iron mould base is cast iron mould base cast with more than three years of cast iron in place.

9. A hot-bending mould according to any one of claims 1 to 3, further comprising a sealing cover (4) covering the outer periphery of the mould base body (1), the sealing cover (4) being sealingly connected to the mould base body (1).

10. Mould according to claim 9, characterized in that said sealing cover (4) is a high temperature resistant sealing cover.