阅读说明：本技术 一种连续纤维增强热塑性瓦楞板生产方法及系统 (Production method and system of continuous fiber reinforced thermoplastic corrugated board ) 是由 陶杰 韦加宁 李华冠 项俊贤 陈熹 陶永睿 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种连续纤维增强热塑性瓦楞板生产方法及系统,该系统包括牵引机构、张紧机构、加热装置、轧制机构、引导槽。轧制机构包括下模、校形上模、顶出机构、上模座、固定板、预成形上模、下模座。其中预成形上模固定于上模座上,校形上模上端由顶出机构控制,随顶出机构的收缩上下移动,顶出机构上端固定于上模座上,固定板固定于上模座上。随着固定板下行,带动上模座下行,从而带动顶出机构及预成形上模下行,顶出机构带动校形上模下行,完成轧制过程。本发明生产效率高、模具简单,生产成本低,为连续纤维增强热塑性瓦楞板的批量生产提供了较好的思路。(The invention discloses a method and a system for producing continuous fiber reinforced thermoplastic corrugated boards. The rolling mechanism comprises a lower die, a shape correcting upper die, an ejection mechanism, an upper die holder, a fixed plate, a preforming upper die and a lower die holder. The pre-forming upper die is fixed on the upper die base, the upper end of the sizing upper die is controlled by the ejection mechanism and moves up and down along with the shrinkage of the ejection mechanism, the upper end of the ejection mechanism is fixed on the upper die base, and the fixing plate is fixed on the upper die base. And the fixed plate moves downwards to drive the upper die base to move downwards so as to drive the ejection mechanism and the preformed upper die to move downwards, and the ejection mechanism drives the sizing upper die to move downwards to finish the rolling process. The invention has high production efficiency, simple die and low production cost, and provides a better idea for the batch production of the continuous fiber reinforced thermoplastic corrugated board.)

1. A system for reinforcing thermoplastic corrugated board by continuous fiber is characterized by sequentially comprising a traction mechanism (1), a tensioning mechanism (2), a heating device (3), a rolling mechanism (4) and a guide groove (5); the rolling mechanism comprises a lower die (6), a sizing upper die (7), an ejection mechanism (8), an upper die base (9), a fixing plate (10), a preforming upper die (11) and a lower die base (12); the pre-forming upper die (11) is fixed on the upper die holder (9), the upper end of the sizing upper die (7) is controlled by an ejection mechanism (8) and moves up and down along with the shrinkage of the ejection mechanism, the upper end of the ejection mechanism (8) is fixed on the upper die holder (9), and the fixing plate (10) is fixed on the upper die holder (9); the sheet is conveyed to a heating device (3) through a traction mechanism (1) and heated to a softening temperature; the sheet is sent into a preforming section of the rolling mechanism (4), the traction mechanism stops feeding, the ejection mechanism (8) pulls the upper correcting die (7) upwards to enable the distance between the upper correcting die and the lower die (6) to be larger than that of the upper preforming die (11), the upper correcting die (7) is prevented from being matched with the lower die (6), the upper preforming die (11) is pressed downwards to be matched with the lower die (6), the sheet is formed, the preforming process is completed, and pressure is maintained; after the pressure maintaining is finished, the preforming upper die (11) moves upwards to return to the original position and waits for shape correction, then the traction mechanism starts feeding, and the preformed part of the sheet is sent to a shape correction section; after the preformed sheet part is sent into the shape correction section, the traction mechanism stops feeding, the ejection mechanism (8) moves downwards to reset the upper shape correction die (7), the die starts to press downwards, the upper shape correction die (7) is matched with the lower die (6), then the ejection mechanism (8) is compressed due to the downward pressing of the die, so that the upper shape correction die (7) is pressurized, the upper preformed die (11) is not matched with the lower die (6), so that the preformed sheet is corrected, pressure is maintained, cooling is carried out again, and then the upper shape correction die (7) moves upwards to finish the shape correction process; after the sheet material is formed, the traction mechanism starts to feed and sends the sheet material to the guide groove (5) for cutting.

2. A method for producing continuous fiber reinforced thermoplastic corrugated board is characterized by comprising the following steps:

step 1: designing the shape and size of the formed corrugated board, feeding the continuous fiber reinforced thermoplastic sheet material through a traction mechanism (1), and ensuring the sheet material to be smooth and flat by a tensioning mechanism (2);

step 2: the sheet is conveyed to a heating device (3) through a traction mechanism (1) and heated to a softening temperature;

and step 3: the sheet is sent into a preforming section of the rolling mechanism (4), the traction mechanism stops feeding, the ejection mechanism (8) pulls the upper correcting die (7) upwards to enable the distance between the upper correcting die and the lower die (6) to be larger than that of the upper preforming die (11), the upper correcting die (7) is prevented from being matched with the lower die (6), the upper preforming die (11) is pressed downwards to be matched with the lower die (6), the sheet is formed, the preforming process is completed, and pressure is maintained; after the pressure maintaining is finished, the preforming upper die (11) moves upwards to return to the original position and waits for shape correction, then the traction mechanism starts feeding, and the preformed part of the sheet is sent to a shape correction section;

and 4, step 4: after the preformed sheet part is sent into the shape correction section, the traction mechanism stops feeding, the ejection mechanism (8) moves downwards to reset the upper shape correction die (7), the die starts to press downwards, the upper shape correction die (7) is matched with the lower die (6), then the ejection mechanism (8) is compressed due to the downward pressing of the die, so that the upper shape correction die (7) is pressurized, the upper preformed die (11) is not matched with the lower die (6), so that the preformed sheet is corrected, pressure is maintained, cooling is carried out again, and then the upper shape correction die (7) moves upwards to finish the shape correction process;

and 5: and (5) after the sheet is formed, feeding by the traction mechanism, conveying to the guide groove (5) for cutting, and repeating the operations from the step (3) to the step (5) to finish the preparation of the corrugated board.

3. The method of claim 1, wherein: if the continuous fiber reinforced thermoplastic sheet material in the step 1 uses PP as a matrix, when the thickness is less than 0.5mm, the feeding speed of the traction mechanism (1) is 12-15mm/s, when the thickness is 0.5-1mm, the feeding speed of the traction mechanism (1) is 8-12mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 170-210 ℃ after the continuous fiber reinforced thermoplastic sheet material is heated by a heating device.

4. The method of claim 1, wherein: if the continuous fiber reinforced thermoplastic sheet material in the step 1 takes PPS as a matrix, when the thickness of the sheet material is less than 0.5mm, the feeding speed of the traction mechanism (1) is 9-12mm/s, when the thickness of the sheet material is 0.5-1mm, the feeding speed of the traction mechanism (1) is 6-8mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 290-.

5. The method of claim 1, wherein: if the continuous fiber reinforced thermoplastic sheet material in the step 1 uses PEEK as a matrix, when the thickness of the sheet material is less than 0.5mm, the feeding speed of the traction mechanism (1) is 8-10mm/s, when the thickness of the sheet material is 0.5-1mm, the feeding speed of the traction mechanism (1) is 5-7mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 370-410 ℃ after the continuous fiber reinforced thermoplastic sheet material is heated by a heating device.

6. The method of claim 1, wherein: in the step 1, the tension force of the tension mechanism (2) is 0.5-1 MPa.

7. The method of claim 1, wherein: and a plurality of infrared heating lamp tubes are arranged in the heating device (3) in the step 2.

8. The method of claim 1, wherein: the rolling mechanism in the step 3 consists of a lower die (6), a sizing upper die (7), an ejection mechanism (8), an upper die holder (9), a fixing plate (10), a preforming upper die (11) and a lower die holder (12). The pre-forming upper die (11) is fixed on the upper die base (9), the upper end of the sizing upper die (7) is controlled by an ejection mechanism (8) and can move up and down, the upper end of the ejection mechanism (8) is fixed on a fixed plate (10), and the fixed plate (10) is fixed on the upper die base (9).

9. The method of claim 8, wherein: the working surfaces of the pre-forming upper die (11) and the shape correcting upper die (7) are in a semi-hexagonal shape or a circular shape.

10. The method according to claim 8, characterized in that the lower die (6) has a working surface profile corresponding to the pre-forming upper die (11) and the sizing upper die (7), and the lower part of the sizing section of the lower die is provided with a cooling water circuit.

Technical Field

The invention relates to the technical field of advanced composite materials and preparation and forming thereof, in particular to a method and a system for producing continuous fiber reinforced thermoplastic corrugated boards.

Background

The continuous fiber reinforced thermoplastic honeycomb core material is used as a novel structural material processed according to the bionic principle of honeycomb. Has light volume weight, large specific strength and rigidity, impact resistance, fatigue resistance and excellent corrosion resistance. Since the advent of continuous fiber reinforced thermoplastic honeycomb core materials, the continuous fiber reinforced thermoplastic honeycomb core materials are rapidly and widely developed and applied in the fields of aviation, aerospace, machinery, automobiles, buildings and the like, and common continuous fiber reinforced thermoplastic honeycomb core materials take PP, PPS, PEEK and the like as raw materials.

The continuous fiber reinforced thermoplastic corrugated board is an important raw material for preparing the continuous fiber reinforced thermoplastic honeycomb core material, and the preparation method of the continuous fiber reinforced thermoplastic honeycomb core material is a roll forming bonding method at present. However, the method has certain limitations, the size precision of the forming roller is difficult to control, the corrugated plate is easy to shrink and deform in the cooling process, the rolling time is short, so that the size precision is difficult to ensure, the feeding control difficulty of each mechanism is high during rolling, and the production efficiency is low.

For the continuous fiber reinforced thermoplastic material, in the process of manufacturing the honeycomb core, the fiber orientation of the material is easy to deviate, the surface quality is poor, the component proportion of the fiber and the resin is difficult to control, and the rigidity and the strength of the material are low, so that the continuous fiber reinforced thermoplastic honeycomb core is difficult to realize batch production.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a method and a system for producing continuous fiber reinforced thermoplastic corrugated boards.

The technical scheme of the invention is as follows:

a system for reinforcing thermoplastic corrugated board by continuous fiber comprises a traction mechanism (1), a tensioning mechanism (2), a heating device (3), a rolling mechanism (4) and a guide groove (5) in sequence; the rolling mechanism comprises a lower die (6), a sizing upper die (7), an ejection mechanism (8), an upper die base (9), a fixing plate (10), a preforming upper die (11) and a lower die base (12); the pre-forming upper die (11) is fixed on the upper die holder (9), the upper end of the sizing upper die (7) is controlled by an ejection mechanism (8) and moves up and down along with the shrinkage of the ejection mechanism, the upper end of the ejection mechanism (8) is fixed on the upper die holder (9), and the fixing plate (10) is fixed on the upper die holder (9); the sheet is conveyed to a heating device (3) through a traction mechanism (1) and heated to a softening temperature; the sheet is sent into a preforming section of the rolling mechanism (4), the traction mechanism stops feeding, the ejection mechanism (8) pulls the upper correcting die (7) upwards to enable the distance between the upper correcting die and the lower die (6) to be larger than that of the upper preforming die (11), the upper correcting die (7) is prevented from being matched with the lower die (6), the upper preforming die (11) is pressed downwards to be matched with the lower die (6), the sheet is formed, the preforming process is completed, and pressure is maintained; after the pressure maintaining is finished, the preforming upper die (11) moves upwards to return to the original position and waits for shape correction, then the traction mechanism starts feeding, and the preformed part of the sheet is sent to a shape correction section; after the preformed sheet part is sent into the shape correction section, the traction mechanism stops feeding, the ejection mechanism (8) moves downwards to reset the upper shape correction die (7), the die starts to press downwards, the upper shape correction die (7) is matched with the lower die (6), then the ejection mechanism (8) is compressed due to the downward pressing of the die, so that the upper shape correction die (7) is pressurized, the upper preformed die (11) is not matched with the lower die (6), so that the preformed sheet is corrected, pressure is maintained, cooling is carried out again, and then the upper shape correction die (7) moves upwards to finish the shape correction process; after the sheet material is formed, the traction mechanism starts to feed and sends the sheet material to the guide groove (5) for cutting.

A method for producing continuous fiber reinforced thermoplastic corrugated board comprises the following steps:

step 1: designing the shape and size of the formed corrugated board, feeding the continuous fiber reinforced thermoplastic sheet material through a traction mechanism (1), and ensuring the sheet material to be smooth and flat by a tensioning mechanism (2);

step 2: the sheet is conveyed to a heating device (3) through a traction mechanism (1) and heated to a softening temperature;

and step 3: the sheet is sent into a preforming section of the rolling mechanism (4), the traction mechanism stops feeding, the ejection mechanism (8) pulls the upper correcting die (7) upwards to enable the distance between the upper correcting die and the lower die (6) to be larger than that of the upper preforming die (11), the upper correcting die (7) is prevented from being matched with the lower die (6), the upper preforming die (11) is pressed downwards to be matched with the lower die (6), the sheet is formed, the preforming process is completed, and pressure is maintained; after the pressure maintaining is finished, the preforming upper die (11) moves upwards to return to the original position and waits for shape correction, then the traction mechanism starts feeding, and the preformed part of the sheet is sent to a shape correction section;

and 4, step 4: after the preformed sheet part is sent into the shape correction section, the traction mechanism stops feeding, the ejection mechanism (8) moves downwards to reset the upper shape correction die (7), the die starts to press downwards, the upper shape correction die (7) is matched with the lower die (6), then the ejection mechanism (8) is compressed due to the downward pressing of the die, so that the upper shape correction die (7) is pressurized, the upper preformed die (11) is not matched with the lower die (6), so that the preformed sheet is corrected, pressure is maintained, cooling is carried out again, and then the upper shape correction die (7) moves upwards to finish the shape correction process;

and 5: and (5) after the sheet is formed, feeding by the traction mechanism, conveying to the guide groove (5) for cutting, and repeating the operations from the step (3) to the step (5) to finish the preparation of the corrugated board.

In the method, if the continuous fiber reinforced thermoplastic sheet material in the step 1 uses PP as a matrix, when the thickness is less than 0.5mm, the feeding speed of the traction mechanism (1) is 12-15mm/s, when the thickness is 0.5-1mm, the feeding speed of the traction mechanism (1) is 8-12mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 170-210 ℃ after the continuous fiber reinforced thermoplastic sheet material is heated by a heating device.

In the method, if the continuous fiber reinforced thermoplastic sheet material in the step 1 uses PPS as a matrix, when the thickness of the sheet material is less than 0.5mm, the feeding speed of the traction mechanism (1) is 9-12mm/s, when the thickness of the sheet material is 0.5-1mm, the feeding speed of the traction mechanism (1) is 6-8mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 290-330 ℃ after the continuous fiber reinforced thermoplastic sheet material is heated by a heating device.

In the method, if the continuous fiber reinforced thermoplastic sheet material in the step 1 uses PEEK as a matrix, when the thickness of the sheet material is less than 0.5mm, the feeding speed of the traction mechanism (1) is 8-10mm/s, when the thickness of the sheet material is 0.5-1mm, the feeding speed of the traction mechanism (1) is 5-7mm/s, and the temperature of the continuous fiber reinforced thermoplastic sheet material fed at the speed is about 370-410 ℃ after the continuous fiber reinforced thermoplastic sheet material is heated by a heating device.

In the method, the tension of the tension mechanism (2) in the step 1 is 0.5-1 MPa.

In the method, a plurality of infrared heating lamp tubes are arranged in the heating device (3) in the step 2.

In the method, the dwell time in the step 3 is 0.5-0.8Ls, and the time interval for waiting the shape correction is 0.3-0.6Ls, wherein L is the bottom width of the working surface of the preformed upper die (11).

According to the method, the rolling mechanism in the step 3 consists of a lower die (6), a sizing upper die (7), an ejection mechanism (8), an upper die holder (9), a fixing plate (10), a preforming upper die (11) and a lower die holder (12). The pre-forming upper die (11) is fixed on the upper die base (9), the upper end of the sizing upper die (7) is controlled by an ejection mechanism (8) and can move up and down, the upper end of the ejection mechanism (8) is fixed on a fixed plate (10), and the fixed plate (10) is fixed on the upper die base (9).

According to the method, the working surfaces of the pre-forming upper die (11) and the sizing upper die (7) are in a semi-hexagonal or circular shape.

According to the method, the side length L of the working surfaces of the semi-hexagonal pre-forming upper die (11) and the sizing upper die (7) is 8-20mm, the stroke is 35-50mm, chamfers are arranged at edges and corners of the working surfaces, and the radius is 0.5-2 mm.

According to the method, the widths H of the bottom planes of the working surfaces of the semicircular preforming upper die (11) and the sizing upper die (7) are 8-20mm, the radius R of the arc part is 8-20mm, and the arc angle theta is 30-70 degrees.

According to the method, the working surface profile of the lower die (6) is consistent with that of the pre-forming upper die (11) and the shape correcting upper die (7), and a cooling water loop is arranged at the lower part of the shape correcting section of the lower die.

According to the method, the pressing pressure of the preforming upper die (11) is 0.4-2 MPa.

According to the method, the length of the ejection mechanism (8) is 20-40mm, the diameter is 10-20mm, and the elasticity is 0.4-2 MPa.

According to the method, the stroke of the sizing upper die (7) is 15-35 mm.

In the method, in the step 5, the length M of the guide groove (5) is 2-3Amm, the width N is 1.2-1.5Bmm, and a heating device is arranged below the bottom plate to control the cooling rate of the corrugated board, wherein the heating temperature is 0.3-0.6T ℃, A is the length of the corrugated board, B is the width of the corrugated board, and T is the softening temperature of the sheet.

The invention has the beneficial effects that:

1. the invention provides a rolling die combining preforming and shape correction, which obviously improves the forming quality of the continuous fiber reinforced thermoplastic corrugated board and ensures that the continuous fiber reinforced thermoplastic corrugated board has higher forming precision and bonding performance. And the rolling die has simple structure, low cost, high production efficiency and reliable practicability.

2. The method realizes uniform heating and cooling of the continuous fiber reinforced thermoplastic sheet material, ensures that the continuous fiber reinforced thermoplastic sheet material is not easy to run off in a molten state in the production process, has uniform thickness and consistent fiber direction, solves the problem of batch preparation of the continuous fiber reinforced thermoplastic corrugated board, and provides a new thought for the efficient production of the continuous fiber reinforced thermoplastic honeycomb core material.

Drawings

FIG. 1 is a flow chart of a production line according to the present invention;

FIG. 2 is a diagram of a continuous fiber reinforced thermoplastic semi-hexagonal rolling die;

FIG. 3 is a schematic view of a continuous fiber reinforced thermoplastic semi-circular preform upper die and a sizing upper die;

FIG. 4 is a schematic illustration of the sizing of the pre-forming upper die in the semi-circular corrugating die;

FIG. 5 is a schematic view of the guide groove (left side view, right side view)

In the figure, 1 is a traction mechanism, 2 is a tensioning mechanism, 3 is a heating device, 4 is a rolling mechanism, 5 is a guide groove, 6 is a lower die, 7 is a sizing upper die, 8 is an ejection mechanism, 9 is a fixing plate, 10 is an upper die base, 11 is a preforming upper die, 12 is a lower die base, 13 is a semicircular lower die, 14 is a semicircular sizing upper die, and 15 is a semicircular preforming upper die.

Detailed Description

The present invention will be described in detail with reference to specific examples.

Example 1

In the first step, a continuous fiber reinforced thermoplastic sheet with the thickness of 0.1mm and PP as a matrix is selected as a raw material and is arranged on a tractor. Selecting the shape of the prepared corrugated board: the side length L is a half hexagon of 8mm, the length is 30cm, and the width is 5 cm. Designing parts of a rolling mechanism: the working surface of the pre-forming upper die, the shape correcting upper die and the lower die is in the shape of a semi-hexagon with the side length L of 8cm, and the edges and corners of the working surface are provided with fillets with the radius of 0.5 mm. The stroke of the preforming upper die is 35mm, the pressing pressure is 0.4MPa, the pressure of the ejection mechanism is 0.3MPa, the diameter is 10mm, and the length is 20 mm. Designing a guide groove: the length is 60cm and the width is 6 cm. And opening the traction mechanism, starting the traction mechanism to rotate, feeding at the speed of 15mm/s, and applying 0.5MPa to the sheet by the tensioning mechanism to ensure that the sheet is smooth and flat.

And in the second step, the sheet is conveyed to a heating device through a traction mechanism, the feeding speed is 10mm/s, the sheet is heated to about 170 ℃, and the sheet is ready for forming.

And thirdly, the sheet is sent into a preforming section of the rolling mechanism, the traction mechanism stops feeding, the ejection mechanism pulls the sizing upper die upwards, the distance between the sizing upper die and the lower die is larger than that between the sizing upper die and the preforming upper die, the sizing upper die is prevented from being matched with the lower die, the preforming upper die is pressed downwards and matched with the lower die at the moment, the sheet is formed, the preforming process is completed, the pressing pressure of the preforming upper die is 0.4MPa, and the pressure is maintained for 4 s. After the pressure maintaining is finished, the preforming upper die and the shape correcting upper die move upwards to return to the original positions, after 2 seconds, the traction mechanism starts feeding, and after the sheet preforming part is sent to the shape correcting section, the shape correcting is waited.

And fourthly, after the preformed part of the sheet is sent into the shape correction section, stopping feeding by the traction mechanism, moving the ejection mechanism downwards to reset the shape correction upper die, starting to press down the die, enabling the shape correction upper die to be matched with the lower die, compressing the ejection mechanism due to the pressing down of the die, applying pressure to the shape correction upper die by the ejection mechanism, enabling the pressure applied to the shape correction upper die by the ejection mechanism to be 0.4MPa, enabling the preformed upper die to be not matched with the lower die at the moment, performing shape correction on the preformed sheet again, maintaining the pressure for 4s, cooling the sheet to be solid by a cooling loop arranged on the lower part, and enabling the shape correction upper die to move upwards to complete the shape correction process.

And fifthly, opening a heating device of the guide groove, wherein the heating temperature is about 80 ℃, and conveying the corrugated board to the guide groove for cutting. And after the corrugated board is formed, cooling the corrugated board to room temperature on a cooling conveying belt, and conveying the corrugated board to a storage box.

Example 2

In the first step, a continuous fiber reinforced thermoplastic sheet with the thickness of 0.5mm and PPS as a base body is selected as a raw material and is arranged on a tractor. The prepared corrugated board is semicircular in shape, 40cm in length and 7cm in width, the width H of the bottom plane of the working face is 15mm, the radius R of the arc part is 15mm, and the arc angle theta is 50 degrees. Designing parts of a rolling mechanism: the working surface shapes of the pre-forming upper die, the shape correcting upper die and the lower die are consistent with the size of the corrugated board. The stroke of the preforming upper die is 40mm, the pressing pressure is 1MPa, the pressure of the ejection mechanism is 1MPa, the diameter is 15mm, and the length is 30 mm. Designing a guide groove: the length is 1m and the width is 8 cm. And opening the traction mechanism, starting the traction mechanism to rotate, wherein the feeding speed is 10mm/s, and applying 0.8MPa to the sheet by the tensioning mechanism to ensure that the sheet is smooth and flat.

And in the second step, the sheet is conveyed to a heating device through a traction mechanism, the feeding speed is 10mm/s, the sheet is heated to about 300 ℃, and the sheet is ready for forming.

And thirdly, the sheet is sent into a preforming section of the rolling mechanism, the traction mechanism stops feeding, the ejection mechanism pulls the sizing upper die upwards, the distance between the sizing upper die and the lower die is larger than that between the sizing upper die and the preforming upper die, the sizing upper die is prevented from being matched with the lower die, the preforming upper die is pressed downwards at the moment and matched with the lower die, the sheet is formed, a preforming process is completed, the pressing pressure of the preforming upper die is 1MPa, and the pressure is maintained for 10 s. After the pressure maintaining is finished, the preforming upper die and the shape correcting upper die move upwards to return to the original positions, the traction mechanism starts to feed after the pressure maintaining is finished for 6s, and the preformed part of the sheet is conveyed into the shape correcting section to wait for shape correction.

And fourthly, after the preformed part of the sheet is sent into the shape correction section, stopping feeding by the traction mechanism, moving the ejection mechanism downwards to reset the shape correction upper die, starting to press down the die, enabling the shape correction upper die to be matched with the lower die, compressing the ejection mechanism due to the pressing down of the die, applying pressure to the shape correction upper die by the ejection mechanism, enabling the pressure applied to the shape correction upper die by the ejection mechanism to be 1MPa, enabling the preformed upper die to be not matched with the lower die, performing shape correction on the preformed sheet again, maintaining the pressure for 10s, cooling the sheet to be solid by a cooling loop arranged on the lower portion, and enabling the shape correction upper die to move upwards to complete the shape correction process.

And fifthly, opening a heating device of the guide groove, wherein the heating temperature is about 180 ℃, and conveying the corrugated board to the guide groove for cutting. And after the corrugated board is formed, cooling the corrugated board to room temperature on a cooling conveying belt, and conveying the corrugated board to a storage box.

Example 3

In the first step, a continuous fiber reinforced thermoplastic sheet material with the thickness of 1mm and taking PEEK as a matrix is selected as a raw material and is arranged on a tractor. Selecting the shape of the prepared corrugated board: the side length L is a half hexagon of 20mm, the length is 50cm, and the width is 10 cm. Designing parts of a rolling mechanism: the working surface of the pre-forming upper die, the shape correcting upper die and the lower die is in the shape of a semi-hexagon with the side length L of 20cm, and the edges and corners of the working surface are provided with fillets with the radius of 1 mm. The stroke of the preforming upper die is 50mm, the pressing pressure is 2MPa, the pressure of the ejection mechanism is 2MPa, the diameter is 20mm, and the length is 40 mm. Designing a guide groove: the length is 125cm and the width is 15 cm. And opening the traction mechanism, starting the traction mechanism to rotate, feeding at the speed of 15mm/s, and applying 1MPa to the sheet by the tensioning mechanism to ensure that the sheet is smooth and flat.

And in the second step, the sheet is conveyed to a heating device through a traction mechanism, the feeding speed is 15mm/s, the sheet is heated to about 410 ℃, and the sheet is ready for forming.

And thirdly, the sheet is sent into a preforming section of the rolling mechanism, the traction mechanism stops feeding, the ejection mechanism pulls the sizing upper die upwards, the distance between the sizing upper die and the lower die is larger than that between the sizing upper die and the preforming upper die, the sizing upper die is prevented from being matched with the lower die, the preforming upper die is pressed downwards at the moment and matched with the lower die, the sheet is formed, a preforming process is completed, the pressing pressure of the preforming upper die is 2MPa, and the pressure is maintained for 16 s. After the pressure maintaining is finished, the preforming upper die and the shape correcting upper die move upwards to return to the original positions, the traction mechanism starts to feed after 12 seconds, and the preformed part of the sheet is sent to the shape correcting section to wait for shape correction.

And fourthly, after the preformed part of the sheet is sent into the shape correction section, stopping feeding by the traction mechanism, moving the ejection mechanism downwards to reset the shape correction upper die, starting to press down the die, enabling the shape correction upper die to be matched with the lower die, compressing the ejection mechanism due to the pressing down of the die, applying pressure to the shape correction upper die by the ejection mechanism, enabling the pressure applied to the shape correction upper die by the ejection mechanism to be 2MPa, enabling the preformed upper die to be not matched with the lower die, performing shape correction on the preformed sheet again, maintaining the pressure for 16s, cooling the sheet to be solid by a cooling loop arranged on the lower portion, and enabling the shape correction upper die to move upwards to complete the shape correction process.

And fifthly, opening a heating device of the guide groove, wherein the heating temperature is about 220 ℃, and conveying the corrugated board to the guide groove for cutting. And after the corrugated board is formed, cooling the corrugated board to room temperature on a cooling conveying belt, and conveying the corrugated board to a storage box.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.