Forming tool for super-thick double-curvature organic glass and using method of forming tool

Abstract

The invention provides an ultra-thick double-curvature organic glass forming tool and a using method thereof, and relates to a power output structure, the ultra-thick double-curvature organic glass forming tool comprises a female die frame with a guide wheel and a male die frame which is located above the female die frame and driven by a hydraulic cylinder on the female die frame to ascend and descend, the female die frame is provided with a female die body, the male die frame is provided with a male die body, and the female die body is provided with a guide wheel. A vacuum air suction pipe set is further arranged on the female die frame and comprises a plurality of sets of air suction holes formed in the molded surface of the female die body, air suction pipelines connected with the air suction holes and a vacuum pump connected with the air suction pipelines. And the vacuum pump is used for pumping out unattached air between the molded surface of the female die body and the organic glass during die assembly through the air suction pipeline and the air suction hole. Therefore, the problems that super-thick double-curvature organic glass with the thickness larger than 30 mm is large in forming difficulty and prone to rebound after being formed are solved.

Description

Technical Field

[0001] The invention relates to a forming processing device and method, in particular to a forming tool for ultra-thick double-curvature organic glass and a use method thereof. Background Art

[0002] At present, as the fourth-generation fighters gradually become the main combat aircraft, the demand for integrated canopies is gradually increasing. In the future, fighters other than drones will most likely be equipped with integrated canopies. At present, there are few domestic manufacturers that can produce and manufacture this type of canopy, so there is a large gap in the industry.

[0003] The traditional canopy structure is generally divided into a fixed windshield and a movable canopy, while the integrated canopy eliminates the interface between the traditional windshield and the canopy, integrating the windshield and the canopy into a whole, thereby improving the bird strike resistance and stealth performance; the integrated canopy adopts a hyperbolic special-shaped structure. As a large-size part, the single piece is heavy and thick. Problems exposed in the manufacturing process include the difficulty in forming large-size transparent parts, complex processes, long production cycles, and difficulty in eliminating the surrounding skirts during the forming process. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a forming tool for ultra-thick hyperbolic plexiglass and a method of using the same, using large-scale forming equipment, a forming device combining male and female molds and vacuum forming, and a special forming process, so as to solve the problem that ultra-thick hyperbolic plexiglass with a thickness greater than 30 mm is difficult to form and easy to rebound after forming.

[0005] The present invention provides the following technical solutions:

[0006] A forming tool for ultra-thick hyperbolic organic glass and a method for using the same, comprising a die frame with a guide wheel and a punch frame located above the die frame and driven to rise and fall by a hydraulic cylinder on the die frame. The die frame with the guide wheel can facilitate the transfer of glass to an oven in an actual operation process. The die frame is provided with a die body, and the punch frame is provided with a punch body. The die body and the punch body are used for mold-forming ultra-thick hyperbolic organic glass with a thickness greater than 30 mm. The die frame is also provided with a vacuum suction pipe group, which includes a plurality of suction holes arranged on a die body profile, suction pipes connected to the suction holes, and a vacuum pump connected to the suction pipe. The vacuum pump is used to extract unfaced air between the die body profile and the organic glass during mold-forming through the suction pipe and the suction holes, so as to ensure that the molded part fits the die and the shape is guaranteed.

[0007] At this point, the special forming processing device of the present invention is designed, and the forming force is increased by combining hydraulic force and vacuum extraction, which can appropriately reduce the temperature required for forming. The top surface of the transparent part is ensured to be tightly attached to the die through vacuum forming, so as to obtain more processing allowance for the subsequent CNC milling shape.

[0008] Preferably, the female mold frame is further provided with a placement frame group, which includes two pairs of linear guide rail groups arranged at both ends of the female mold body and two groups of glass placement frame angle steels arranged in parallel between the two pairs of linear guide rail groups, each pair of linear guide rail groups includes two groups of linear guide rail units distributed in an upward flaring shape toward the outside, and the two ends of the glass placement frame angle steel are slidably mounted on the two groups of relatively distributed linear guide rail units through respective sliders, so as to support and fix the glass blank before mold closing;

[0009] In actual operation, the glass blank - flat glass is cut according to the cutting size and fixed to the angle steel of the glass rack with thick cotton rope. Due to the simulated forming state, after the device is pushed into the oven and heated to the softening temperature, and through the sliding traction of the linear guide unit around the angle steel of the glass rack, the glass blank can be bent into a U shape due to its own weight, thereby achieving the effect of reducing the influence of the skirt by designing a special cutting shape.

[0010] Preferably, two sets of guide rods are respectively provided at both ends of the female mold frame, and the guide rods are guide-connected to the male mold frame to ensure the stability when the hydraulic cylinder drives the male mold frame to rise and fall.

[0011] Preferably, the female mold body is positioned on the female mold frame by a plurality of partition reinforcing ribs, and the male mold body is positioned on the male mold frame by a plurality of partition reinforcing ribs. Based on this, the lightness of the mold frame can be ensured and the stability of the fixation can be guaranteed.

[0012] Preferably, the partition reinforcement ribs 1 and the partition reinforcement ribs 2 are arranged opposite to each other up and down in pairs, so that when the die body and the punch body are stamped and closed, stamping deformation can be better avoided.

[0013] Preferably, the glass blank is cut according to the cutting size and then fixed to the angle steel of the glass placing rack with a thick cotton rope, so that the glass blank is fixed to the angle steel of the glass placing rack. At the same time, through the sliding traction of the linear guide unit around the angle steel of the glass placing rack, the glass blank can be bent into a U shape due to its own weight, thereby achieving the effect of designing a special cutting shape to reduce the influence of the skirt.

[0014] A method for using a forming tool for ultra-thick double-curvature organic glass comprises the following steps:

[0015] S1: Pre-bending: First, cut the glass blank into the required size and fix it on the angle steel of the glass rack with a thick cotton rope, and then push the concave mold frame into the oven. The pre-bending temperature in the oven is set to 120℃~130℃, and the insulation time is 2h~3h, so that the glass blank is softened, and then the glass blank can be bent into a U-shaped semi-finished product due to its own weight through the sliding traction of the linear guide unit around the angle steel of the glass rack;

[0016] S2: Mold closing and forming: Push the die frame that has completed step S1 out of the oven, use a crane to hoist the punch frame to install it above the die frame, and fix the hydraulic cylinder and the punch frame through a hydraulic flange. Then push the die frame into the oven. After the temperature in the oven is raised to the mold closing temperature of 135℃~145℃, use the hydraulic cylinder to slowly control the die body and the punch body to close to the limit position in multiple times, and the insulation time is set to 2h~3h;

[0017] S3: Vacuum forming: start the vacuum pump under the heat preservation state in step S2, extract the remaining air between the mold body surface and the organic glass to form negative pressure, ensure that the transparent part is completely attached to the mold body surface, and keep the pressure for 2h to 3h before cooling;

[0018] S4: Cooling and removing parts: When the vacuum pump is turned on, the temperature in the oven is cooled to room temperature, and then the forming tooling is pushed out, the punch body is removed by the overhead crane, and the formed ultra-thick hyperbolic plexiglass transparent parts are removed to complete the forming process.

[0019] The beneficial effects of the present invention are:

[0020] 1 The forming device and method of the present invention are suitable for forming non-directional organic glass. The fitting degree of the formed surface is ensured by hydraulic mold closing and extrusion, and finally the top (possibly thinned part) of the transparent part is ensured to be closely attached to the concave mold by vacuum forming, so as to obtain more processing allowance for the subsequent CNC milling shape. The advantages of this forming method for forming double-curvature products are: the forming process can ensure the fitting degree of the surface and reduce the material thickness thinning rate, and because the temperature is lowered after the male and female molds are closed, the cooling rate of the inner and outer surfaces of the transparent part is basically the same, the stress difference between the inner and outer surfaces after cooling is small, and the formed part is not easy to rebound and deform;

[0021] 2 The transparent part material used in the present invention is YB-M-10 non-oriented organic glass sheet. During the forming process, due to the excessive curvature, a skirt is easily generated around the periphery. Therefore, a special blanking shape is designed, and the hydraulic cylinder loading force is used to slowly close the concave and convex molds. The concave and convex model surfaces are processed and manufactured according to the theoretical profile. The constant temperature vacuum adsorption method is used to closely fit the convex surface of the transparent part with the tooling concave mold, thereby reducing the thinning rate of the top of the transparent part and removing stress at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the die frame;

[0025] Figure 3 It is a schematic diagram of the structure of the punch die frame;

[0026] Markings in the figure:

[0027] 1. Concave die frame; 2. Punch die frame; 11. Guide wheel; 12. Hydraulic cylinder; 13. Concave die body; 14. Air suction duct; 15. Air suction hole; 16. Linear guide rail assembly; 17. Glass placement rack angle steel; 18. Guide rod; 19. Partition reinforcement rib 1; 21. Punch die body; 22. Partition reinforcement rib 2. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1-3 As shown, a forming tool for ultra-thick double-curvature organic glass, in this embodiment, includes a female mold frame 1 with a guide wheel 11 and a male mold frame 2 located above the female mold frame 1 and driven to rise and fall by a hydraulic cylinder 12 on the female mold frame 1. The female mold frame 1 with the guide wheel 11 can facilitate the transfer of glass to the oven in the actual operation process. The female mold frame 1 is provided with a female mold body 13, and the male mold frame 2 is provided with a male mold body 21. The female mold body 13 and the male mold body 21 are used for mold closing. The ultra-thick double-curvature organic glass with a thickness greater than 30mm, the said concave mold frame 1 is also provided with a vacuum suction pipe group, the said vacuum suction pipe group comprises a plurality of suction holes 15 arranged on the molding surface of the concave mold body 13, a suction pipe 14 connected with the suction holes 15 and a vacuum pump connected with the suction pipe 14, the said vacuum pump is used to extract the unfaced air between the molding surface of the said concave mold body 13 and the organic glass during the mold closing through the suction pipe 14 and the suction holes 15, so as to ensure that the molded part fits the concave mold and guarantees the shape.

[0030] At this point, the special forming processing device of the present invention is designed, and the forming force is increased by combining hydraulic force and vacuum extraction, which can appropriately reduce the temperature required for forming. The top surface of the transparent part is ensured to be tightly attached to the die through vacuum forming, so as to obtain more processing allowance for the subsequent CNC milling shape.

[0031] The female mold frame 1 is also provided with a placement frame group, which includes two pairs of linear guide rail groups 16 arranged at both ends of the female mold body 13 and two groups of glass placement frame angle steels 17 arranged in parallel between the two pairs of linear guide rail groups 16. Each pair of linear guide rail groups 16 includes two groups of linear guide rail units that are distributed in an upward flaring shape toward the outside, and the two ends of the glass placement frame angle steels 17 are slidably mounted on the two groups of relatively distributed linear guide rail units through respective sliders, so as to support and fix the glass blank before mold closing;

[0032] In actual operation, the glass blank - flat glass is cut according to the cutting size and fixed to the glass rack angle 17 with a thick cotton rope. Due to the simulated forming state, after the device is pushed into the oven and heated to the softening temperature, and through the sliding traction of the linear guide unit around the glass rack angle 17, the glass blank can be bent into a U shape due to its own weight, thereby achieving the effect of reducing the influence of the skirt by designing a special cutting shape.

[0033] Two sets of guide rods 18 are also provided at both ends of the female mold frame 1. The guide rods 18 are connected with the male mold frame 2 in a guiding manner to ensure the stability when the hydraulic cylinder 12 drives the male mold frame 2 to rise and fall.

[0034] The die body 13 is positioned on the die frame 1 by a plurality of partition reinforcing ribs 19, and the punch body 21 is positioned on the punch frame 2 by a plurality of partition reinforcing ribs 22, thereby ensuring the lightness of the die frame and the stability of the fixation.

[0035] The partition reinforcing rib 19 and the partition reinforcing rib 22 are arranged opposite to each other up and down in pairs, so when the die body 13 and the punch body 21 are stamped and closed, stamping deformation can be better avoided.

[0036] The glass blank is cut according to the size and fixed to the glass rack angle 17 with a thick cotton rope, so that the glass blank is fixed to the glass rack angle 17. At the same time, through the sliding traction of the linear guide unit around the glass rack angle 17, the glass blank can be bent into a U shape due to its own weight, thereby achieving the effect of reducing the influence of the skirt by designing a special cutting shape.

[0037] Example 2

[0038] A method for using a forming tool for ultra-thick double-curvature organic glass, based on the forming tool for ultra-thick double-curvature organic glass described in Example 1, comprises the following steps:

[0039] S1: Pre-bending: First, cut the glass blank into the required size and fix it on the glass rack angle steel 17 with a thick cotton rope, and then push the die frame 1 into the oven. The pre-bending temperature in the oven is set to 120°C to 130°C, and the heat preservation time is 2h to 3h, so that the glass blank is softened, and the glass blank can be bent into a U-shaped semi-finished product due to its own weight through the sliding traction of the linear guide unit around the glass rack angle steel 17;

[0040] S2: mold closing and forming: push the female mold frame 1 that has completed step S1 out of the oven, use a crane to hoist the male mold frame 2 to install it above the female mold frame 1, and use a hydraulic flange to fix the hydraulic cylinder 12 and the male mold frame 2, and then push the female mold frame 1 into the oven. After the temperature in the oven is raised to the mold closing temperature of 135℃~145℃, use the hydraulic cylinder 12 to slowly control the female mold body 13 and the male mold body 21 to close the mold to the limit position in multiple times, and the insulation time is set to 2h~3h;

[0041] S3: Vacuum forming: start the vacuum pump under the heat preservation state in step S2, extract the remaining air between the mold surface of the die body 13 and the organic glass to form negative pressure, ensure that the transparent part is completely attached to the mold surface of the die body 13, and keep the pressure for 2h to 3h before cooling;

[0042] S4: Cooling and removing parts: When the vacuum pump is turned on, the temperature in the oven is cooled to room temperature, and then the forming tooling is pushed out, and the punch body 21 is removed by the overhead crane, and the formed ultra-thick hyperbolic plexiglass transparent part is removed to complete the forming process.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A forming tool for ultra-thick double-curvature organic glass, characterized in that: The invention comprises a die frame (1) with a guide wheel (11) and a punch frame (2) located above the die frame (1) and driven to rise and fall by a hydraulic cylinder (12) on the die frame (1); a die body (13) is provided on the die frame (1); a punch body (21) is provided on the punch frame (2); the die body (13) and the punch body (21) are used for mold-forming ultra-thick double-curvature organic glass with a thickness greater than 30 mm; a vacuum suction pipe group is also provided on the die frame (1); the vacuum suction pipe group comprises a plurality of suction holes (15) arranged on the mold surface of the die body (13), suction pipes (14) connected to the suction holes (15), and a vacuum pump connected to the suction pipe (14); the vacuum pump is used to extract the unfaced air between the mold surface of the die body (13) and the organic glass when the mold is closed through the suction pipe (14) and the suction holes (15).

2. The forming tool for ultra-thick double-curvature organic glass according to claim 1, characterized in that: The female mold frame (1) is also provided with a placement frame group, which includes two pairs of linear guide rail groups (16) arranged at the two ends of the female mold body (13) and two groups of glass placement frame angle steels (17) arranged in parallel between the two pairs of linear guide rail groups (16). Each pair of linear guide rail groups (16) includes two groups of linear guide rail units that are distributed in an upward flaring shape toward the outside, and the two ends of the glass placement frame angle steels (17) are slidably mounted on the two groups of relatively distributed linear guide rail units through respective sliders, so as to support and fix the glass blank before mold closing.

3. The forming tool for ultra-thick double-curvature organic glass according to claim 2, characterized in that: Two sets of guide rods (18) are also provided at both ends of the female mold frame (1), and the guide rods (18) are connected to the male mold frame (2) in a guiding manner.

4. The forming tool for ultra-thick double-curvature organic glass according to claim 2, characterized in that: The female mold body (13) is positioned on the female mold frame (1) through a plurality of partition reinforcing ribs (19), and the male mold body (21) is positioned on the male mold frame (2) through a plurality of partition reinforcing ribs (22).

5. The forming tool for ultra-thick double-curvature organic glass according to claim 4, characterized in that: The partition reinforcement rib 1 (19) and the partition reinforcement rib 2 (22) are arranged opposite to each other up and down.

6. The forming tool for ultra-thick double-curvature organic glass according to claim 1, characterized in that: The glass blank is cut according to the size and then fixed on the angle steel (17) of the glass placing frame by using a thick cotton rope.

7. A method for using a forming tool for ultra-thick double-curvature organic glass, characterized in that: The steps include: S1: Pre-bending: First, cut the glass blank into pieces according to the size and fix them on the angle steel (17) of the glass placing rack with a thick cotton rope, and then push the concave mold frame (1) into the oven. The pre-bending temperature in the oven is set to 120° C. to 130° C., and the heat preservation time is 2 h to 3 h, so that the glass blank is softened, and the glass blank can be bent into a U-shaped semi-finished product due to its own weight through the sliding traction of the linear guide rail unit around the angle steel (17) of the glass placing rack; S2: mold closing and forming: the female mold frame (1) that has completed step S1 is pushed out of the oven, the male mold frame (2) is installed on the top of the female mold frame (1) by a crane, and the hydraulic cylinder (12) and the male mold frame (2) are fixed by a hydraulic flange, and then the female mold frame (1) is pushed into the oven. After the temperature in the oven is raised to the mold closing temperature of 135°C to 145°C, the hydraulic cylinder (12) is used to slowly control the female mold body (13) and the male mold body (21) to close the mold to the limit position in multiple times, and the heat preservation time is set to 2h to 3h; S3: Vacuum forming: in the heat preservation state in step S2, the vacuum pump is turned on to extract the remaining air between the mold surface of the concave mold body (13) and the organic glass to form a negative pressure, so as to ensure that the transparent part is completely attached to the mold surface of the concave mold body (13), and the pressure is maintained for 2h to 3h before cooling down; S4: Cooling and removing the parts: When the vacuum pump is turned on, the temperature in the oven is cooled to room temperature, and then the forming tooling is pushed out, and the punch body (21) is removed by the crane, and the formed ultra-thick double-curvature organic glass transparent part is removed to complete the forming process.

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