Forming die and forming device for square-basin-shaped complex-curved-surface acrylic transparent part

Abstract

The utility model discloses a forming die and a forming device for a square-basin-shaped complex-curved-surface acrylic transparent part, and the forming die is characterized in that one side, facing a cover plate, of a base is provided with a concave die cavity, one side, facing the base, of the cover plate is provided with a groove, the base is provided with an air exhaust cavity, and the air exhaust cavity is communicated with the concave die cavity through a plurality of air exhaust holes; an exhaust pipe is arranged at the end, away from the cover plate, of the base and communicates with the exhaust cavity, and an inflation pipe is arranged at the end, away from the base, of the cover plate and communicates with the groove. The forming die and the forming device can thoroughly solve the problems of crazing, pocking marks, internal stress, deformation and the like easily occurring in the forming process of a square-basin-shaped acrylic transparent part hot press.

Description

Technical Field

[0001] This utility model relates to the field of molding technology for complex curved acrylic transparent parts, specifically to a molding die and molding device for a square basin-shaped complex curved acrylic transparent part. Background Technology

[0002] Aerospace-grade acrylic, due to its lightweight, excellent optical properties, and impact resistance, can replace inorganic glass in transparent components of transportation equipment such as aircraft, high-speed trains, automobiles, and flying cars. However, the molding of complex curved acrylic transparent components, such as square basins, currently generally uses a hot press with matching dies for hot extrusion molding. This involves heating the acrylic blank to the molding temperature in an oven, placing it into the die, turning on the press, and closing the die to form the acrylic. This molding process has the following problems:

[0003] 1. The suitable molding temperature range for aerospace-grade acrylic sheets is relatively narrow. If the actual molding temperature is too low, the acrylic is prone to silver streaks; if the molding temperature is too high, defects such as mold indentations and pitting are prone to appear on the acrylic surface.

[0004] 2. The hot press forming process results in uneven stress on the acrylic sheet, and the cooling process after acrylic thermoforming is difficult to control. Different parts of the transparent part cool at different rates, which can cause internal stress in the acrylic transparent part, leading to deformation of the formed transparent part.

[0005] Therefore, it is necessary to find ways to solve the above-mentioned technical problems. Utility Model Content

[0006] In view of the above-mentioned problems existing in the prior art, the aim is to provide a molding die and molding device for a square basin-shaped complex curved acrylic transparent part.

[0007] The specific technical solution is as follows:

[0008] A molding die for a complex curved acrylic transparent part in the shape of a square basin mainly includes: a cover plate and a base;

[0009] The base has a concave mold cavity on the side facing the cover plate, and the cover plate has a groove on the side facing the base. The base has an air extraction cavity, which is connected to the concave mold cavity through several air extraction holes on the concave mold. An air extraction pipe is provided at the end of the base away from the cover plate, and the air extraction pipe is connected to the air extraction cavity. An inflation pipe is provided at the end of the cover plate away from the base, and the inflation pipe is connected to the groove.

[0010] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following feature: the outer shape of the cavity is the outer surface shape of the molded square basin product.

[0011] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following feature: an air extraction hole is provided at the center of the cavity.

[0012] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following feature: each of the four corners of the concave mold cavity is provided with an air extraction hole.

[0013] The molding die for the aforementioned square basin-shaped complex curved acrylic transparent part also has the following feature: a sealing ring is provided between the cover plate and the base.

[0014] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following feature: the cover plate and the base are connected by a first fastener.

[0015] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following features: the base includes a seat plate and a cavity mold connected to each other, wherein the cavity mold faces the cover plate, the cavity mold cavity is disposed on the side of the cavity mold facing the cover plate, the side of the cavity mold away from the cavity mold cavity is provided with a groove, and the seat plate and the side of the cavity mold away from the cavity mold cavity are sealed together to form the air extraction cavity.

[0016] The above-mentioned molding die for a complex curved acrylic transparent part in the shape of a square basin also has the following feature: the base plate and the concave mold are connected by a second fastener.

[0017] A molding apparatus for a square basin-shaped complex curved acrylic transparent part includes: an oven, an air compressor, a vacuum pump, and the molding mold for the square basin-shaped complex curved acrylic transparent part described above.

[0018] The molding die for the complex curved acrylic transparent part in the shape of a square basin is placed in the oven. The air extraction pipe is connected to the vacuum pump, and the air filling pipe is connected to the air compressor.

[0019] The positive effects of the above technical solution are:

[0020] This utility model provides a molding die and molding device for a complex curved acrylic transparent part in the shape of a square basin, which can completely solve the problems of silver lines, pitting, internal stress and deformation that are easy to occur in the hot press molding process of square basin-shaped acrylic transparent parts. Attached Figure Description

[0021] Figure 1 A schematic diagram of the first direction structure of a molding die for a complex curved acrylic transparent part in the shape of a square basin, provided by this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the AA direction.

[0023] In the attached diagram: 1. Cover plate; 101. Groove; 2. Base; 21. Seat plate; 22. Die; 221. Die cavity; 222. Evacuation chamber; 223. Evacuation hole; 3. Evacuation pipe; 4. Inflation pipe; 5. Sealing ring; 6. Bolt; 10. Acrylic blank plate; 20. The formed square basin-shaped product. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] Please see Figure 1 and Figure 2 This utility model discloses a molding die for a square basin-shaped complex curved acrylic transparent part, including: a cover plate 1 and a base 2;

[0028] The base 2 has a concave mold cavity 221 on the side facing the cover plate 1. The base 2 has an air extraction cavity 222, which is connected to the concave mold cavity 221 through a plurality of air extraction holes 223 on the concave mold. The end of the base 2 away from the cover plate 1 is provided with an air extraction pipe 3, which is connected to the air extraction cavity 222. The end of the cover plate 1 away from the base 2 is provided with an inflation pipe 4, which is connected to the groove 101.

[0029] Specifically, the base 2 includes a seat plate 21 and a die 22 connected to each other. The die 22 faces the cover plate 1, and the die cavity 221 is located on the side of the die 22 facing the cover plate 1. A groove is provided on the side of the die 22 away from the die cavity 221. The seat plate 21 and the side of the die 22 away from the die cavity are sealed together to form a vacuum chamber 222. The groove is an open structure, and the seat plate 21 closes the open groove to form the vacuum chamber 222. In effect, the die 22 is sealed to the cover plate 1. The seat plate 21 and the die 22 are connected by a second fastener, and a sealing ring 5 is designed to achieve a seal. This is a split design. Of course, the base 2 can also be designed as a one-piece structure.

[0030] The external shape of the cavity 221 is the same as the outer surface shape of the molded square basin-shaped product 20. A release cloth can be placed inside the cavity 221.

[0031] Optionally, an air extraction hole 223 is provided at the center of the cavity 221.

[0032] Preferably, an air extraction hole 223 is provided at the center of the cavity 221, and an air extraction hole 223 is provided at each of the four corners of the cavity 221. This design is to improve the molding quality of the most difficult part of the square basin-shaped product to form, and to improve efficiency.

[0033] A sealing ring 5 is provided between the cover plate 1 and the base 2. The sealing ring 5 is used to achieve a seal between the cover plate 1 and the base 2.

[0034] The cover plate 1 and the base 2 are connected by a first fastener.

[0035] Optionally, both the first fastener and the second fastener can be screws, bolts, or rivets.

[0036] This utility model also discloses a molding device for a square basin-shaped complex curved acrylic transparent part, including: an oven (not shown in the figure), an air compressor (not shown in the figure), a vacuum pump (not shown in the figure), and the molding mold for the square basin-shaped complex curved acrylic transparent part mentioned above.

[0037] A molding die for a complex curved acrylic transparent part in the shape of a square basin is placed in the oven. The suction pipe 3 is connected to the vacuum pump, and the inflation pipe 4 is connected to the air compressor. The vacuum pump, air compressor, and oven can all be based on existing technologies, which will not be elaborated upon here.

[0038] In use, an acrylic blank plate 10 is machined according to the drawings using a CNC engraving machine. The suction pipe 3 is connected to a vacuum pump via a pipeline; the inflation pipe 4 is connected to the groove 101 of the cover plate 1, and the inflation pipe 4 is connected to an air compressor via a pipeline. The acrylic blank plate 10 is placed between the cover plate 1 and the base 2, and the first fastener locks the cover plate 1 and the base 2 together. The sealing ring 5 is used to seal the upper and lower spaces of the acrylic blank plate, achieving airtightness. The entire molding mold is placed in an oven with hot air circulation, and the air compressor and vacuum pump are located outside the oven. When the temperature reaches the acrylic molding temperature (for example, the molding temperature of a certain type of aerospace-grade acrylic is 125 degrees Celsius), the vacuum pump is turned on, and the air extraction pipe 3 begins to draw a vacuum, creating a negative pressure at the bottom of the acrylic blank plate 10; at the same time, the air compressor is turned on, and compressed air of the pressure value determined by the process is injected into the cover plate 1 through the air inlet pipe 4, creating a certain positive pressure at the top of the acrylic blank plate 10. Under the superposition of positive and negative pressure, the acrylic blank plate 10 quickly adheres to the surface of the die 22, realizing the precise molding of the square basin-shaped transparent acrylic part. The release cloth pasted on the surface of the die 22 can prevent mold marks from appearing on the surface of the product. After molding, turn off the oven power and use a fan to agitate the air, allowing the oven to cool slowly and evenly, ensuring the acrylic does not develop internal stress during cooling. Once the oven temperature reaches the temperature specified in the process, open the oven door and introduce cold air to continue cooling the oven until the transparent acrylic part reaches approximately 40 degrees Celsius, setting the shape. Then, turn off the vacuum pump and air compressor, pull the molding die out of the oven, open the molding die, and remove the transparent part (the molded square basin-shaped part 20). To increase production, a large oven with hot air circulation can be used, and a special mold rack can be made. Place the molding dies on the mold rack, with multiple sets of molding dies on each layer, stacked multiple times. Dozens of molding dies can be loaded at a time, and the oven can produce dozens of transparent acrylic parts at a time. The lower part of the mold frame is designed as a trolley that can roll on the track. The bottom of the oven is equipped with a track to facilitate the mold frame trolley to enter and exit the oven. After the acrylic transparent part is formed and cooled, the mold frame trolley that has been formed and cooled is pulled out of the oven by the traction mechanism to take out the transparent part (the formed square basin-shaped product 20).

[0039] Compared with the prior art, the present invention can achieve the following technical effects:

[0040] 1. Using the above-mentioned molding mold and molding device to produce complex curved acrylic transparent parts such as square basins, the vacuuming and gas filling process of acrylic molding applies uniform pressure to the acrylic blank plate 10, resulting in uniform wall thickness and good optical quality of the transparent part (the square basin-shaped product 20 after molding). (The optical quality of transparent parts is often an important technical indicator for transparent parts of aircraft, high-speed trains, flying cars, and automobiles.)

[0041] 2. The molding temperature of acrylic can be accurately controlled. After thermoforming, transparent acrylic parts can achieve uniform cooling. No internal stress is generated inside the transparent parts (the square basin-shaped product 20 after molding). After molding, the transparent parts will not deform.

[0042] 3. It solves the problems that are prone to occur in the traditional hot press die forming process of square basin-shaped acrylic transparent parts. Due to uneven stress and temperature during acrylic forming, the acrylic transparent parts are prone to silver streaks, pitting, and large internal stress. Large internal stress leads to deformation of the transparent parts after forming, as well as poor optical quality of the transparent parts.

[0043] 4. Using the above-mentioned molding mold to produce complex curved acrylic transparent parts such as square basins significantly reduces equipment investment compared to the traditional hot press die forming process, resulting in significant economic benefits.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A molding die for a complex curved acrylic transparent part in the shape of a square basin, characterized in that, include: Cover plate and base; The base has a concave mold cavity on the side facing the cover plate, and the cover plate has a groove on the side facing the base. The base has an air extraction cavity, which is connected to the concave mold cavity through several air extraction holes. An air extraction pipe is provided at the end of the base away from the cover plate, and the air extraction pipe is connected to the air extraction cavity. An air inflation pipe is provided at the end of the cover plate away from the base, and the air inflation pipe is connected to the groove.

2. The molding die for the complex curved acrylic transparent part in the shape of a square basin, as described in claim 1, is characterized in that, The external shape of the cavity is the same as the outer surface shape of the formed square basin-shaped product.

3. The molding die for the complex curved acrylic transparent part in the shape of a square basin according to claim 2, characterized in that, An air extraction hole is provided at the center of the cavity.

4. The molding die for the complex curved acrylic transparent part in the shape of a square basin, as described in claim 3, is characterized in that... Each of the four corners of the cavity is provided with an air extraction hole.

5. The molding die for a square basin-shaped complex curved acrylic transparent part according to any one of claims 1 to 4, characterized in that, A sealing ring is provided between the cover plate and the base.

6. The molding die for a square basin-shaped complex curved acrylic transparent part according to any one of claims 1 to 4, characterized in that, The cover plate and the base are connected by a first fastener.

7. The molding die for a square basin-shaped complex curved acrylic transparent part according to any one of claims 1 to 4, characterized in that, The base includes a seat plate and a die connected to each other, wherein the die faces the cover plate, the die cavity is disposed on the side of the die facing the cover plate, and a groove is provided on the side of the die away from the die cavity. The seat plate and the side of the die away from the die cavity are sealed together to form the air extraction cavity.

8. The molding die for the complex curved acrylic transparent part in the shape of a square basin according to claim 7, characterized in that, The base plate and the die are connected by a second fastener.

9. A molding apparatus for a complex curved acrylic transparent part in the shape of a square basin, characterized in that, include: Oven, air compressor, vacuum pump, and molding die for the square basin-shaped complex curved acrylic transparent part as described in any one of claims 1 to 8; The molding die for the complex curved acrylic transparent part in the shape of a square basin is placed in the oven. The air extraction pipe is connected to the vacuum pump, and the air filling pipe is connected to the air compressor.

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