Hot pressing and continuous forming device and hot pressing and continuous forming method

Abstract

The invention provides a hot pressing and uninterrupted forming device and a hot pressing and uninterrupted forming method wherein the hot pressing device comprises: a lower die comprising a lower die plate; the upper die comprises an upper die plate, the upper die plate comprises a main die pressing face and a first inclined face located on the front side of the main die pressing face in the moving direction of materials, and the first inclined face gradually inclines downwards from front to back. The upper mold plate is provided with a first position for pressing the main mold pressing surface and the working surface of the lower mold plate, a second position for pressing the first inclined surface and the working surface of the lower mold plate, and a non-working position far away from the working surface of the lower mold plate; and the driving device is in driving fit with the upper mold to drive the upper mold plate to move, so that the upper mold plate is switched among the first position, the second position and the non-working position. By means of the technical scheme, the problem that in the prior art, a plurality of spaced indentations can appear on a finished product material formed after hot pressing machining can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of product processing, and in particular to a hot pressing and uninterrupted forming device and a hot pressing and uninterrupted forming method. Background Art

[0002] With the widespread application of composite materials in aerospace, automobile manufacturing, construction, sporting goods and other fields, hot pressing devices, as key equipment for composite material molding and processing, have a vital impact on product quality and production costs due to their performance and efficiency.

[0003] Traditional hot presses use high temperature and pressure to cure resin, forming the desired composite part. These devices typically consist of a fixed upper and lower molds, where the material is pressed together to achieve a solid-state transformation, ultimately achieving the desired shape and properties.

[0004] However, in the uninterrupted molding process of composite materials, the existing technology has some problems that need to be solved urgently. Since composite materials require relatively large pressure, they cannot be pressed all the time and need to be pressed intermittently. That is, press down once, hold for a period of time, then lift it up, and the discharge mechanism at the back pulls out a section, and then continues to press down. After the above-mentioned processing, multiple spaced indentations will appear on the finished material. These indentations not only affect the appearance quality of the finished product, but more importantly, they will cause stress concentration inside the material. Especially in multiple molding or processing processes, the problem of stress concentration will gradually accumulate, and eventually affect the mechanical properties of the composite material. Summary of the Invention

[0005] The main purpose of the present invention is to provide a hot pressing and uninterrupted forming device and a hot pressing and uninterrupted forming method to solve the problem in the prior art that multiple spaced indentations appear on the finished material formed after hot pressing.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a hot pressing device is provided for pressing materials, comprising: a lower mold, comprising a lower mold plate; an upper mold, arranged above the lower mold, the upper mold comprising an upper mold plate, the plate surface of the upper mold plate cooperating with the lower mold plate comprising a main molding surface and a first inclined surface located in front of the main molding surface in the movement direction of the material, the first inclined surface gradually tilts downward from front to back, the upper mold plate having a first position for pressing the main molding surface with the working surface of the lower mold plate, a second position for pressing the first inclined surface with the working surface of the lower mold plate, and a non-working position away from the working surface of the lower mold plate; a driving device, cooperating with the upper mold drive to drive the upper mold plate to rotate so that the upper mold plate switches between the first position and the second position, and the driving device can also drive the upper mold plate to move so that the upper mold plate moves to the non-working position.

[0007] In one embodiment, the first inclined surface is a plane, a first arc transition surface is provided between the main molding surface and the first inclined surface, and the upper mold plate also includes an intermediate transition position between the first position and the second position. When the upper mold plate is in the transition position, the first arc transition surface is pressed against the working surface of the lower mold plate; alternatively, the first inclined surface is a curved surface.

[0008] In one embodiment, when the first inclined surface is a plane, the inclination angle of the first inclined surface is between 3° and 5°, and the length of the first inclined surface is not less than 3% of the length of the upper mold plate.

[0009] In one embodiment, the driving device includes a plurality of driving members arranged along the front and rear directions of the hot pressing device, the driving members include push rods that move up and down, and mounting members corresponding one to one to the plurality of driving members are provided on the upper mold plate, and the push rods of the driving members are hingedly connected to the mounting members.

[0010] In one embodiment, the push rod of the driving member is hingedly connected to the mounting member via a hinge member, the hinge member includes an upper hinge point and a lower hinge point, the push rod is hingedly connected to the upper hinge point, and the mounting member is hingedly connected to the lower hinge point.

[0011] In one embodiment, the plate surface of the upper mold plate and the lower mold plate that cooperate also includes a second inclined surface located on the rear side of the main molding surface, and the second inclined surface gradually tilts downward from the back to the front. The upper mold plate also has a third position for pressing the second inclined surface with the working surface of the lower mold plate. The driving device drives the upper mold plate to rotate so that the upper mold plate switches between the first position, the second position and the third position.

[0012] In one embodiment, the second inclined surface is a plane, and a second arc transition surface is provided between the main molding surface and the second inclined surface. The inclination angle of the second inclined surface is between 3° and 5°, and the length of the second inclined surface is not less than 3% of the length of the upper mold plate. The driving device includes a plurality of driving members arranged along the front and rear directions of the hot pressing device, and the driving member includes a push rod that moves up and down. The upper mold plate is provided with mounting members corresponding to the plurality of driving members. The push rod of the driving member is hingedly connected to the corresponding mounting member through a hinge. The hinge includes an upper hinge point and a lower hinge point. The push rod is hingedly connected to the upper hinge point, and the mounting member is hingedly connected to the lower hinge point.

[0013] In one embodiment, the upper mold plate includes a plurality of hot press plate units arranged from front to back, the first inclined surface is located on the front hot press plate unit, and the second inclined surface is located on the rear hot press plate unit.

[0014] According to another aspect of the present invention, an uninterrupted forming device is provided, comprising: a discharge device; a hot pressing device, arranged at the rear side of the discharge device, for hot pressing the material discharged by the discharge device to form a finished material, the hot pressing device being the above-mentioned hot pressing device; a traction device, arranged at the rear side of the hot pressing device, the traction device tractions the finished material; a control device, the hot pressing device and the traction device are both electrically connected to the control device.

[0015] According to another aspect of the present invention, a hot pressing method is provided, which uses the above-mentioned hot pressing device. The hot pressing method includes: step S10: moving the upper mold plate of the hot pressing device to a first position by a driving device of the hot pressing device, and allowing the upper mold plate to stay for a first predetermined time; step S20: the driving device rotates the upper mold plate to a second position; step S60: the driving device moves the upper mold plate to a non-working position.

[0016] In one embodiment, between steps S20 and S60, the hot pressing method further includes: step S50: a driving device rotates the upper mold plate to the first position and holds the upper mold plate for a second predetermined time, where the second predetermined time is greater than the first predetermined time. According to the above hot pressing method, when the hot pressing device further includes a second inclined surface, between steps S20 and S60, the hot pressing method further includes: step S30: rotating the upper mold plate of the hot pressing device to a third position via the driving device.

[0017] In one embodiment, when the hot pressing method includes step S50, the hot pressing method also includes: step S40: judging the number of times the upper mold plate switches between the second position and the third position; if the number does not reach the threshold, executing step S20; if the number reaches the threshold, executing step S50.

[0018] According to the last aspect of the present invention, an uninterrupted forming method is provided, which adopts the above-mentioned uninterrupted forming device, and the uninterrupted forming method includes: step S01: controlling the traction device of the uninterrupted forming device to pull the material a predetermined distance through the control device of the uninterrupted forming device; step S02: controlling the driving device of the hot pressing device of the uninterrupted forming device through the control device, so that the driving device drives the upper mold plate of the hot pressing device of the uninterrupted forming device to move to the first position, and makes the upper mold plate stay for a third predetermined time; step S03: controlling the driving device through the control device, and the driving device rotates the upper mold plate to the second position; step S07: controlling the driving device through the control device, and the driving device moves the upper mold plate to the non-working position, and executes step S01.

[0019] In one embodiment, between step S03 and step S07, the uninterrupted molding method further includes: step S06: the control device controls the driving device, the driving device rotates the upper mold plate to the first position and stays for a fourth predetermined time, and the fourth predetermined time is greater than the third predetermined time.

[0020] In one embodiment, when the hot pressing device also includes a second inclined surface, between step S03 and step S06, the uninterrupted molding method also includes: step S04: controlling the driving device through the control device, and the driving device rotates the upper mold plate to the third position; step S05: judging the number of times the upper mold plate switches between the second position and the third position, if the number does not reach the threshold, executing step S03, if the number reaches the threshold, executing step S06.

[0021] In one embodiment, the control device makes the distances between two adjacent pulling of materials different.

[0022] By applying the technical solution of the present invention, after the material enters the mold, the driving device first drives the upper mold plate to move to the first position and allows the upper mold plate to stay for a predetermined time. At this time, a slight indentation may appear at the position of the material corresponding to the front edge of the main molding surface. Then, the driving device drives the upper mold plate to rotate to the second position. During the rotation process, the upper mold plate gradually applies pressure to the indented part to remove the indentation. When the upper mold plate rotates to the second position, the part of the front side of the material that is not pressed will be pressed between the first inclined surface and the working surface of the lower mold plate, thereby pressing this part of the material. When the processing is completed, the driving device can drive the upper mold plate to move to the non-working position, and then pull the material backward. This cycle continues to generate a finished material without indentations. That is to say, in this embodiment, by setting the plate surface of the upper mold plate as the main molding surface and the first inclined surface, the purpose is to move the part of the material where the indentation appears to the inside of the mold, and then the upper mold plate gradually presses down by the end portion to ensure the uniform distribution of pressure, remove the indentation, and solve the problem of multiple indentations appearing on the finished material in the prior art. On the one hand, this makes the appearance of the product smooth, and on the other hand, it ensures the performance of the finished composite material.

[0023] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0025] Figure 1A schematic diagram of the three-dimensional structure of an embodiment of a hot pressing device according to the present invention is shown;

[0026] Figure 2 Shown Figure 1 A schematic diagram of the enlarged structure of the hot pressing device at A;

[0027] Figure 3 Shown Figure 1 A schematic top view of a hot pressing device;

[0028] Figure 4 Shown Figure 3 A schematic cross-sectional view of the hot pressing device taken along the AA direction;

[0029] Figure 5 Shown Figure 3 A schematic cross-sectional view of the hot pressing device along the BB direction;

[0030] Figure 6 Shown Figure 5 A schematic diagram of the enlarged structure of the hot pressing device at B;

[0031] Figure 7 Shown Figure 3 A schematic cross-sectional view of the hot pressing device along the CC direction;

[0032] Figure 8 Shown Figure 1 A schematic diagram of a partial structure of the hot pressing device when the upper mold plate is located in the second position;

[0033] Figure 9 Shown Figure 1 A schematic diagram of a partial structure of the hot pressing device when the upper mold plate is located at the third position;

[0034] Figure 10 Shown Figure 1 A schematic cross-sectional view of a partial structure of an upper mold plate of a hot pressing device;

[0035] Figure 11 Shown Figure 1 A schematic three-dimensional structural diagram of a partial structure of a hot pressing plate unit of a hot pressing device;

[0036] Figure 12 Shown Figure 11 A schematic side view of a hot plate unit; and

[0037] Figure 13 A schematic structural diagram of the uninterrupted forming device according to the present invention is shown.

[0038] The above drawings include the following reference numerals:

[0039] 10. Lower mold; 11. Lower mold plate; 20. Upper mold; 21. Upper mold plate; 211. Main molding surface; 212. First inclined surface; 213. First circular arc transition surface; 214. Mounting part; 215. Second inclined surface; 216. Second circular arc transition surface; 217. Hot pressing plate unit; 218. First transition surface; 219. Hinge; 2191. Upper hinge point; 2192. Lower hinge point; 30. Driving device; 31. Driving member; 311. Push rod; 40. Base; 41. Guide shaft; 50. Organ cover; 120. Discharging device; 140. Hot pressing device; 150. Pulling device. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to facilitate the embodiments of the present invention described herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatuses.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] In response to the indentation problem that occurs during the uninterrupted molding process of composite materials, the inventors conducted detailed analysis and experiments. The inventors believe that indentations not only affect the appearance of the product, but may also cause stress concentration, especially when performing secondary or multiple molding. The negative impact on the mechanical properties of the material increases with the number of molding cycles. The inventors initially analyzed that the indentation originated from the gap at the mold connection. However, after accurately adjusting the mold gap many times, they found that even if the mold is extremely airtight, the indentation cannot be completely avoided. Subsequently, attention turned to the temperature difference effect when the material enters the mold port. Experiments have shown that although appropriate temperature control can alleviate the indentation, it fails to fundamentally solve the problem. In an accidental observation, the inventors found that if the material is inside the entire mold line from the beginning, there will be no indentation. Therefore, the tone of the need to improve the structure at the mold port was established. In addition, the inventors also thought that if the indentation can be pressed, then the indentation can be reduced or even eliminated.

[0045] On the basis of the above, in order to solve the problem of multiple indentations on the finished material in the prior art, the inventors proposed the following technical solution.

[0046] Specifically, if Figures 1 to 12 As shown, the hot pressing device of this embodiment is used to press the material. The hot pressing device includes: a lower mold 10, an upper mold 20 and a driving device 30. Among them, the lower mold 10 includes a lower mold plate 11. The upper mold 20 is arranged above the lower mold 10. The upper mold 20 includes an upper mold plate 21. The plate surface of the upper mold plate 21 that cooperates with the lower mold plate 11 includes a main molding surface 211 and a first inclined surface 212 located in front of the main molding surface 211 in the movement direction of the material. The first inclined surface 212 gradually tilts downward from front to back. The upper mold plate 21 has a first position for pressing the main molding surface 211 and the working surface of the lower mold plate 11, and a second position for pressing the first inclined surface 212 and the working surface of the lower mold plate 11. Figure 8 The driving device 30 cooperates with the upper mold 20 to drive the upper mold plate 21 to rotate so that the upper mold plate 21 switches between the first position and the second position. The driving device 30 can also drive the upper mold plate 21 to move to the non-working position.

[0047] It should be noted that the first position and the second position of the upper mold plate 21 are actually working positions for processing materials. In other words, the drive device 30 not only enables the upper mold plate 21 to switch between the working position and the non-working position, but also can switch between different working positions.

[0048] Applying the technical solution of this embodiment, after the material enters the mold, the driving device 30 first drives the upper mold plate 21 to move to the first position and allows the upper mold plate 21 to stay for a predetermined time. At this time, a slight indentation may appear at the position of the material corresponding to the front edge of the main molding surface 211. Then, the driving device 30 drives the upper mold plate 21 to rotate to the second position. During the rotation process, the upper mold plate 21 gradually applies pressure to the indented part to remove the indentation. When the upper mold plate 21 rotates to the second position, the part of the front side of the material that is not pressed will be pressed between the first inclined surface 212 and the working surface of the lower mold plate 11, thereby pressing this part of the material. When the processing is completed, the driving device 30 can drive the upper mold plate 21 to move to the non-working position, and then pull the material backward. This cycle continues to generate a finished material without indentations. That is to say, in this embodiment, by setting the plate surface of the upper mold plate 21 as the main molding surface 211 and the first inclined surface 212, the purpose is to allow the part of the material where the indentation appears to move toward the inside of the mold, and then the upper mold plate 21 gradually rolls down by pressing down the end to ensure uniform distribution of pressure, remove the indentation, and solve the problem of multiple indentations appearing on the finished material in the prior art. On the one hand, this makes the appearance of the product smooth, and on the other hand, it ensures the performance of the finished composite material.

[0049] In other words, the core of this embodiment lies in the integration of the first inclined surface 212 of the upper mold plate 21 with the main molding surface 211, along with precise control of the drive device, to achieve uninterrupted molding without indentations, significantly improving the appearance and performance of composite products. This embodiment essentially introduces a novel dynamic pressure distribution mechanism for the material entry and pressing process. When the material first enters the mold, the drive device 30 first drives the upper mold plate 21 to the first position, allowing the material to contact the main molding surface 211. At this point, due to the instantaneous increase in pressure, a slight indentation may be formed along the front edge of the material where it contacts the main molding surface. However, unlike the static pressure maintenance in the prior art, the highlight of this embodiment is that the drive device 30 then rotates the upper mold plate 21 to the second position, where the first inclined surface 212 contacts the working surface of the lower mold plate 11. This action is like the movement of a seesaw. As the upper mold plate 21 rotates, a gradual pressure is applied to the indented portion, effectively removing the indentation. The unpressurized front portion of the material is pressed between the first inclined surface and the lower mold plate, achieving uniform compression and solidification of the material. When the pressing process is completed, the upper mold plate 21 is driven to the non-working position, and then the material is pulled to start the next cycle.

[0050] Furthermore, as mentioned above, the inventors noted the temperature differential effect of the material entering the die port, and experiments have shown that properly regulating the temperature can alleviate indentation. In this embodiment, the presence of the first inclined surface 212 at the die port ensures that, during the initial pressing process, the temperature experienced by the front end of the material is lower than that experienced by the rear end. This reduces the temperature differential at the point where the indentation is formed, thereby reducing the depth of the indentation.

[0051] It should be noted that the first inclined surface 212 has a relatively short time for pressing the material, and the main function of the first inclined surface 212 is to eliminate the indentation. The final pressing and forming of the material still depends on the main pressing surface 211 at the rear side.

[0052] Preferably, in this embodiment, after the upper mold plate 21 rotates to the second position for the first time, the upper mold plate 21 can return from the second position to the first position, and then return to the second position, and perform repeated rolling multiple times, thereby further ensuring that the indentation is eliminated.

[0053] like Figure 1 and Figure 7 As shown, in this embodiment, the lower mold 10, upper mold 20, and drive device 30 are all mounted on a base 40. The base 40 specifically comprises a movable frame and support legs mounted on the frame. When the hot press apparatus needs to be moved, the frame has wheels on its bottom, allowing it to be moved to a desired position. Once at the desired position, when molding is required, the support legs are lowered. The bottom surfaces of the support legs support the entire hot press apparatus, and the wheels are lifted off the ground, allowing molding to begin.

[0054] like Figure 1 、 Figures 10 to 12As shown, in this embodiment, the first inclined surface 212 is a plane, and a first arc transition surface 213 is provided between the main molding surface 211 and the first inclined surface 212. The upper mold plate 21 also includes an intermediate transition position located between the first position and the second position. When the upper mold plate 21 is in the transition position, the first arc transition surface 213 is pressed against the working surface of the lower mold plate 11. Specifically, when the first inclined surface 212 is designed to be a plane and smoothly connected to the main molding surface 211 via the first arc transition surface 213, the upper mold plate 21 will pass through an intermediate transition position during its rotation from the first position to the second position. In this position, the first arc transition surface 213 contacts and presses against the working surface of the lower mold plate 11. This design achieves progressive pressure distribution on the material contact surface, effectively avoiding damage to the material caused by instantaneous high pressure and reducing the occurrence of indentations. Through the gentle transition of progressive pressure, the material is evenly compressed in the initial stage of molding, thereby ensuring the material's morphological stability and improving the surface quality and intrinsic performance of the product. Of course, in other embodiments not shown, the first inclined surface 212 can be configured as a curved surface that smoothly transitions from the main molding surface 211. This structure further enhances the uniformity and flexibility of pressure distribution. The contact area between the curved surface and the material changes with the rotation of the upper mold plate 21, enabling more precise pressure control and ensuring that the material receives appropriate pressure at different locations, resulting in the final product exhibiting better mechanical properties and surface smoothness.

[0055] In this embodiment, when the first inclined surface 212 is a flat surface, the inclination angle of the first inclined surface 212 is between 3° and 5°, and the length of the first inclined surface 212 is no less than 3% of the length of the upper mold plate 21. If the inclination angle of the first inclined surface 212 is too small, the effect of eliminating indentations is relatively poor. If the inclination angle of the first inclined surface 212 is too large, the rotation angle of the upper mold plate 21 will be large, thereby affecting the control and the height of the hot pressing device. If the length of the first inclined surface 212 is too small, the effect of eliminating indentations will also be affected.

[0056] like Figures 1 to 7As shown, in this embodiment, the drive device 30 includes multiple drive members 31 arranged along the front-to-back direction of the hot pressing device. The drive members 31 include push rods 311 that move up and down. The upper mold plate 21 is provided with mounting members 214 corresponding one-to-one to the multiple drive members 31. The push rods 311 of the drive members 31 are hingedly connected to the mounting members 214. Specifically, the hinged connection between the push rods 311 of the drive members 31 and the mounting members 214 on the upper mold plate 21 ensures that the upper mold plate 21 can make slight but critical motion adjustments based on the up and down movement of the push rods 311. The stroke of each push rod 311 of the drive member 31 can be independently adjusted. This independent control mechanism enables precise pressure regulation of the upper mold plate 21. Through the gradual pressure environment, the material can obtain gentle pressure guidance in the early stage of molding, avoiding stress concentration caused by sudden pressure changes, and ensuring the mechanical properties and appearance quality of the composite product.

[0057] like Figure 1 、 Figures 3 to 6 As shown, in this embodiment, the push rod 311 of the driving member 31 is hingedly connected to the mounting member 214 via a hinge. The hinge 219 includes an upper hinge point 2191 and a lower hinge point 2192. The push rod 311 is hingedly connected to the upper hinge point 2191, and the mounting member 214 is hingedly connected to the lower hinge point 2192. The above structure allows the upper mold plate 21 to swing at a larger angle and be more flexible.

[0058] Preferably, if Figure 1 、 Figures 3 to 6 As shown, in this embodiment, the lower end of the push rod 311 is covered with an accordion cover 50, and the lower end of the accordion cover 50 abuts against the upper surface of the upper mold plate 21. The lower end of the push rod 311, the mounting member 214 and the hinge member 219 are all covered in the accordion cover 50.

[0059] Preferably, if Figure 3 and Figure 7 As shown, in this embodiment, the base 40 is further provided with a guide shaft 41 oriented in the same axial direction as the push rod 311. The guide shaft 41 is movable in the vertical direction. A matching seat is provided on the upper mold plate 21. The guide shaft and the matching seat are also hingedly connected via a hinge. This structure makes the upper mold plate 21 more reliable during rotation.

[0060] like Figure 5 As shown, in this embodiment, the mounting members 214 are evenly arranged on the upper mold plate 21 in the front-to-back direction of the hot pressing apparatus. Specifically, due to the even distribution of the mounting members 214, the upper mold plate 21 can more evenly transmit pressure to the material when subjected to force, avoiding localized excessive or insufficient pressure, and reducing surface defects and internal structural unevenness of the product.

[0061] like Figure 9and Figure 10 As shown, in this embodiment, the plate surface of the upper mold plate 21 and the lower mold plate 11 that cooperates also includes a second inclined surface 215 located on the rear side of the main molding surface 211. The second inclined surface 215 gradually slopes downward from the back to the front. The upper mold plate 21 also has a third position ( Figure 9 The driving device 30 drives the upper mold plate 21 to rotate so that the upper mold plate 21 switches between the first position, the second position and the third position. Specifically, a second inclined surface 215 is added to the plate surface where the upper mold plate 21 cooperates with the lower mold plate 11, and is located on the rear side of the main molding surface 211, with the characteristic of gradually tilting downward from the back to the front. This design further optimizes the pressure distribution and product quality during the uninterrupted molding process of the composite material. Specifically, when the material has completely entered the mold and is initially formed under the action of the main molding surface 211, the driving device 30 drives the upper mold plate 21 to rotate to the second position, and the first inclined surface 212 presses the front end of the material, effectively removing the indentations that may be generated on the front edge. Immediately thereafter, the upper mold plate 21 continues to rotate to the third position. At this time, the second inclined surface 215 contacts the working surface of the lower mold plate 11, and performs additional pressing on the rear end of the material, further ensuring the flatness and quality consistency of the product surface.

[0062] In addition, it should be noted that the provision of the second inclined surface 215 effectively supplements the function of the first inclined surface 212. During the molding process, through the precise control of the drive device 30, the upper mold plate 21 can flexibly switch between the first position, the second position, and the third position, achieving comprehensive pressing of the edges of both ends of the material and ensuring uniform pressure on the product in the longitudinal direction. This multi-position, multi-stage molding method not only overcomes the indentation problem common in traditional molding equipment and improves the aesthetic appearance of the product, but also significantly enhances the mechanical properties and structural stability of the composite product through uniform pressure control throughout the entire process.

[0063] Preferably, in this embodiment, after the upper mold plate 21 rotates to the second position for the first time, the upper mold plate 21 actually rotates from the second position to the third position, and then returns to the first position and finally moves to the non-working position. The above rolling is repeated multiple times to further ensure that the indentation is eliminated.

[0064] Further preferably, in this embodiment, when the hot pressing work starts, the upper mold plate 21 is first placed in the first position for 1 minute, and then the upper mold plate 21 is alternately switched between the second position and the third position 2 to 3 times, and finally the upper mold plate 21 is placed in the first position for 10 minutes, and then enters the next cycle.

[0065] like Figure 10As shown, in this embodiment, the second inclined surface 215 is a plane, and a second arc transition surface 216 is provided between the main molding surface 211 and the second inclined surface 215. The second arc transition surface 216 has the same function as the first arc transition surface 213 and will not be described in detail here.

[0066] In this embodiment, the inclination angle of the second inclined surface 215 is between 3° and 5°, and the length of the second inclined surface 215 is not less than 3% of the length of the upper mold plate 21. The design concept of the inclination angle and length of the second inclined surface 215 is consistent with that of the first inclined surface 212 and will not be repeated here.

[0067] like Figure 5 、 Figures 7 to 10 As shown, in this embodiment, the upper mold plate 21 includes a plurality of hot pressing plate units 217 arranged from front to back, the first inclined surface 212 is located on the front hot pressing plate unit 217, and the second inclined surface 215 is located on the rear hot pressing plate unit 217. It should be noted that the temperature of each hot pressing plate unit 217 is different. The frontmost hot pressing plate unit 217 is a hot pressing unit for preheating the material, the middle hot pressing plate unit 217 is a hot pressing unit for high-temperature pressing the material, and the rearmost hot pressing plate unit 217 is a hot pressing unit for low-temperature shaping of the material.

[0068] like Figure 1 、 Figure 2 、 Figures 7 to 12 As shown, the hot pressing device of this embodiment is used to press materials. The hot pressing device includes: a lower mold 10 and an upper mold 20. The lower mold 10 includes a lower mold plate 11. The upper mold 20 is arranged above the lower mold 10 and includes an upper mold plate 21. A first transition surface 218 is provided between the lower surface of the upper mold plate 21 and the front end surface of the upper mold plate 21. The distance between the first transition surface 218 and the lower mold plate 11 gradually decreases from front to back.

[0069] Using the technical solution of this embodiment, a first transition surface 218 is provided between the lower surface of the upper mold plate 21 and the front end face of the upper mold plate 21. The distance between the first transition surface 218 and the lower mold plate 11 gradually decreases from front to back, eliminating the straight-edge, right-angled, cliff-like mold surface. A transition pattern is employed at the mold interface, causing the point where the material is pressed by the edge of the upper mold plate 21 to move inward. The ambient temperature of the material corresponding to the first transition surface 218 is between room temperature and the heating temperature of the upper mold 20, further reducing the impact of temperature differences and alleviating the indentation problem.

[0070] like Figure 1 、 Figure 2 、 Figures 7 to 12As shown, in this embodiment, the bottom corner of the front end of the upper mold plate 21 is rounded, and the rounded surface forms a first transition surface 218. Specifically, the gradually changing distance between the arc-shaped first transition surface 218 and the lower mold plate 11 creates a smooth transition zone from room temperature to the mold heating temperature. This temperature gradient significantly reduces the temperature shock of the material entering the mold, thereby mitigating material property instability and indentation formation that can be caused by sudden temperature changes.

[0071] like Figure 1 、 Figure 2 、 Figures 7 to 12 As shown, in this embodiment, the lower surface of the upper mold plate 21 includes a main molding surface 211 and a first inclined surface 212 located in front of the main molding surface 211 in the direction of material movement. The first inclined surface 212 gradually slopes downward from front to back, and the first transition surface 218 connects with the front end of the first inclined surface 212. The mold ends are rounded, and the middle portion adopts a long, progressive slope, which further reduces the temperature difference impact when the material enters the mold, thereby further alleviating the indentation problem.

[0072] In this embodiment, the bottom corner of the front end of the upper mold plate 21 is rounded, with the rounded surface forming a first transition surface 218. The ratio between the radius of the rounded corner and the length of the hot press plate unit 217 in which it is located is between 2% and 5%. If the ratio is less than 2%, the rounded corner radius is too small, thus affecting the positive effect of the rounded corner design on indentation. If the ratio is greater than 5%, the area of the material hot-pressed by the upper mold plate 21 is too small, thus affecting the efficiency of the hot press.

[0073] like Figure 13 As shown, the present application also provides an uninterrupted forming device, wherein the uninterrupted forming device includes: a discharge device 120, a hot pressing device 140, a traction device 150, and a control device. The hot pressing device 140 is arranged on the rear side of the discharge device 120 to hot-press the material discharged by the discharge device 120 to form a finished material, and the hot pressing device 140 is the above-mentioned hot pressing device 140. The traction device 150 is arranged on the rear side of the hot pressing device 140, and the traction device 150 pulls the finished material. The hot pressing device 140 and the traction device 150 are both electrically connected to the control device. Since the above-mentioned hot pressing device 140 has the advantage of being able to eliminate indentations on the finished material, the uninterrupted forming device having it also has the above-mentioned advantages.

[0074] The present application also provides a hot pressing method, which uses the above-mentioned hot pressing device. According to an embodiment of the hot pressing method of the present application, the method includes: step S10: moving the upper mold plate 21 of the hot pressing device to a first position through the driving device 30 of the hot pressing device, and allowing the upper mold plate 21 to stay for a first predetermined time; step S20: the driving device 30 rotates the upper mold plate 21 to a second position; step S60: the driving device 30 moves the upper mold plate 21 to a non-working position.

[0075] Applying the technical solution of this embodiment, after the material enters the mold, the drive device 30 first drives the upper mold plate 21 to move to the first position and allows the upper mold plate 21 to stay for a first predetermined time. At this time, a slight indentation may appear at the position of the material corresponding to the front edge of the main molding surface 211. Then, the drive device 30 drives the upper mold plate 21 to rotate to the second position. During the rotation process, the upper mold plate 21 gradually applies pressure to the indented part to remove the indentation. When the upper mold plate 21 rotates to the second position, the part of the front side of the material that is not pressed will be pressed between the first inclined surface 212 and the working surface of the lower mold plate 11, thereby pressing this part of the material. When the processing is completed, the drive device 30 can drive the upper mold plate 21 to move to the non-working position, and then pull the material backward. This cycle continues to generate a finished material without indentations. That is to say, in this embodiment, by setting the plate surface of the upper mold plate 21 as the main molding surface 211 and the first inclined surface 212, the purpose is to allow the part of the material where the indentation appears to move toward the inside of the mold, and then the upper mold plate 21 gradually rolls down by pressing down the end to ensure uniform distribution of pressure, remove the indentation, and solve the problem of multiple indentations appearing on the finished material in the prior art. On the one hand, this makes the appearance of the product smooth, and on the other hand, it ensures the performance of the finished composite material.

[0076] In this embodiment, between steps S20 and S60, the hot pressing method further includes: step S50: the driving device 30 rotates the upper mold plate 21 to the first position and holds it there for a second predetermined time, which is greater than the first predetermined time. The first time the upper mold plate 21 rotates to the first position, the upper mold plate 21 handles the material for a relatively short period of time, resulting in a lighter indentation. The indentation is then repeatedly pressed to eliminate it. After the indentation is eliminated, the material is subsequently subjected to further hot pressing.

[0077] In this embodiment, when the hot pressing device further includes a second inclined surface 215, the hot pressing method further includes the following between step S20 and step S60: step S30: rotating the upper mold plate 21 of the hot pressing device to the third position by the driving device 30. Specifically, after the material has completely entered the mold and is initially formed under the action of the main molding surface 211, the driving device 30 drives the upper mold plate 21 to rotate to the second position, and the first inclined surface 212 presses the front end of the material, effectively removing the indentation that may be generated on the front edge. Immediately thereafter, the upper mold plate 21 continues to rotate to the third position, at which time the second inclined surface 215 contacts the working surface of the lower mold plate 11, and performs additional pressing on the rear end of the material, further ensuring the flatness and quality consistency of the product surface.

[0078] In this embodiment, when the hot pressing method includes step S50, the hot pressing method further includes step S40: determining the number of times the upper mold plate 21 switches between the second position and the third position. If the number of times does not reach a threshold, step S20 is executed; if the number of times reaches the threshold, step S50 is executed. This method allows the upper mold plate 21 to repeatedly press the area where indentations will occur, thereby ensuring the smoothness and quality consistency of the product surface.

[0079] The present application also provides an uninterrupted forming method, which adopts the above-mentioned uninterrupted forming device. The uninterrupted forming method includes: step S01: controlling the traction device 150 of the uninterrupted forming device to pull the material a predetermined distance through the control device of the uninterrupted forming device; step S02: controlling the driving device 30 of the hot pressing device 140 of the uninterrupted forming device through the control device, so that the driving device 30 drives the upper mold plate 21 of the hot pressing device 140 of the uninterrupted forming device to move to the first position, and makes the upper mold plate 21 stay for a third predetermined time; step S03: controlling the driving device 30 through the control device, and the driving device 30 rotates the upper mold plate 21 to the second position; step S07: controlling the driving device 30 through the control device, and the driving device 30 moves the upper mold plate 21 to the non-working position, and executing step S01.

[0080] Using the technical solution of this embodiment, the material is first pulled a predetermined distance by the pulling device 150. Then, the driving device 30 drives the upper mold plate 21 to move to the first position and allows the upper mold plate 21 to remain there for a first predetermined time. At this time, a slight indentation may appear on the material at the position corresponding to the front edge of the main molding surface 211. Then, the driving device 30 drives the upper mold plate 21 to rotate toward the second position. During the rotation process, the upper mold plate 21 gradually applies pressure to the indented portion to remove the indentation. When the upper mold plate 21 rotates to the second position, the unpressed portion of the front side of the material is pressed between the first inclined surface 212 and the working surface of the lower mold plate 11, thereby pressing this portion of the material. When the processing is completed, the driving device 30 can drive the upper mold plate 21 to move to the non-working position, and then the pulling device 150 pulls the material backward. This cycle continues to produce a finished material without indentations. That is to say, in this embodiment, by setting the plate surface of the upper mold plate 21 as the main molding surface 211 and the first inclined surface 212, the purpose is to allow the part of the material where the indentation appears to move toward the inside of the mold, and then the upper mold plate 21 gradually rolls down by pressing down the end to ensure uniform distribution of pressure, remove the indentation, and solve the problem of multiple indentations appearing on the finished material in the prior art. On the one hand, this makes the appearance of the product smooth, and on the other hand, it ensures the performance of the finished composite material.

[0081] In this embodiment, between steps S03 and S07, the uninterrupted molding method further includes: Step S06: The control device controls the drive device 30, which causes the upper mold plate 21 to rotate to the first position and remain there for a fourth predetermined time, which is greater than the third predetermined time. The first time the upper mold plate 21 rotates to the first position, the upper mold plate 21 handles the material for a relatively short period of time, resulting in a lighter indentation. The indentation is then rolled to eliminate it. After the indentation is eliminated, the material is subsequently subjected to further hot pressing.

[0082] In this embodiment, when the hot pressing device further includes a second inclined surface 215, the uninterrupted molding method further includes the following between steps S03 and S06: step S04: controlling the drive device 30 via the control device to rotate the upper mold plate 21 to the third position; step S05: determining the number of times the upper mold plate 21 switches between the second position and the third position; if the number does not reach a threshold, executing step S03; if the number reaches the threshold, executing step S06. The above method allows the upper mold plate 21 to repeatedly press the area where indentations will occur, thereby ensuring the surface flatness and quality consistency of the product.

[0083] In this embodiment, the control device varies the distances between two consecutive pulling passes. Specifically, automatic control is employed in the overall pulling process, randomly varying the pulling distance slightly within a set pulling distance range. This allows for secondary depressing of indentations, ultimately resulting in an indentation-free surface on the finished part.

[0084] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0085] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0086] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0087] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A hot pressing device for pressing materials, characterized in that: include: A lower mold (10), comprising a lower mold plate (11); An upper mold (20) is arranged above the lower mold (10), and the upper mold (20) includes an upper mold plate (21). The plate surface of the upper mold plate (21) and the lower mold plate (11) that cooperates includes a main mold pressing surface (211) and a first inclined surface (212) located in front of the main mold pressing surface (211) in the movement direction of the material. The first inclined surface (212) gradually tilts downward from front to back. The upper mold plate (21) has a first position for pressing the main mold pressing surface (211) and the working surface of the lower mold plate (11), a second position for pressing the first inclined surface (212) and the working surface of the lower mold plate (11), and a non-working position away from the working surface of the lower mold plate (11); A driving device (30) cooperates with the upper mold (20) to drive the upper mold plate (21) to rotate, so that the upper mold plate (21) switches between the first position and the second position. The driving device (30) can also drive the upper mold plate (21) to move, so that the upper mold plate (21) moves to the non-working position.

2. The hot pressing device according to claim 1, characterized in that The first inclined surface (212) is a plane, a first arc transition surface (213) is provided between the main molding surface (211) and the first inclined surface (212), and the upper mold plate (21) further includes an intermediate transition position located between the first position and the second position. When the upper mold plate (21) is located at the transition position, the first arc transition surface (213) is pressed against the working surface of the lower mold plate (11); alternatively, the first inclined surface (212) is a curved surface.

3. The hot pressing device according to claim 1, characterized in that When the first inclined surface (212) is a plane, the inclination angle of the first inclined surface (212) is between 3° and 5°, and the length of the first inclined surface (212) is not less than 3% of the length of the upper mold plate (21).

4. The hot pressing device according to claim 1, characterized in that The driving device (30) includes a plurality of driving members (31) arranged along the front-to-back direction of the hot pressing device, the driving member (31) includes a push rod (311) that moves up and down, and the upper mold plate (21) is provided with a mounting member (214) corresponding to the plurality of driving members (31) one by one, and the push rod (311) of the driving member (31) is hingedly connected to the mounting member (214).

5. The hot pressing device according to claim 4, characterized in that The push rod (311) of the driving member (31) is hingedly connected to the mounting member (214) via a hinge member (219), and the hinge member (219) includes an upper hinge point (2191) and a lower hinge point (2192). The push rod (311) is hingedly connected to the upper hinge point (2191), and the mounting member (214) is hingedly connected to the lower hinge point (2192).

6. The hot pressing device according to claim 1, characterized in that The plate surface of the upper mold plate (21) and the lower mold plate (11) that cooperates also includes a second inclined surface (215) located on the rear side of the main molding surface (211), and the second inclined surface (215) gradually tilts downward from the back to the front. The upper mold plate (21) also has a third position for pressing the second inclined surface (215) with the working surface of the lower mold plate (11). The driving device (30) drives the upper mold plate (21) to rotate so that the upper mold plate (21) switches between the first position, the second position and the third position.

7. The hot pressing device according to claim 6, characterized in that The second inclined surface (215) is a plane, a second arc transition surface (216) is provided between the main molding surface (211) and the second inclined surface (215), the inclination angle of the second inclined surface (215) is between 3° and 5°, the length of the second inclined surface (215) is not less than 3% of the length of the upper mold plate (21), the driving device (30) includes a plurality of driving members (31) provided along the front-rear direction of the hot pressing device, and the driving member (31) includes a push rod that moves up and down (311), the upper mold plate (21) is provided with mounting members (214) corresponding one to one with the plurality of driving members (31), the push rod (311) of the driving member (31) is hingedly connected to the corresponding mounting member (214) through a hinge, the hinge (219) includes an upper hinge point (2191) and a lower hinge point (2192), the push rod (311) is hingedly connected to the upper hinge point (2191), and the mounting member (214) is hingedly connected to the lower hinge point (2192).

8. The hot pressing device according to claim 6, characterized in that The upper mold plate (21) includes a plurality of hot pressing plate units (217) arranged from front to back, the first inclined surface (212) is located on the front hot pressing plate unit (217), and the second inclined surface (215) is located on the rear hot pressing plate unit (217).

9. An uninterrupted forming device comprising: a discharge device (120); a hot pressing device (140) disposed at the rear side of the discharge device (120) to perform hot pressing on the material discharged by the discharge device (120) to form a finished material, wherein the hot pressing device (140) is the hot pressing device (140) according to any one of claims 1 to 8; A traction device (150) is provided at the rear side of the hot pressing device (140), and the traction device (150) pulls the finished material; The control device, the hot pressing device (140) and the traction device (150) are all electrically connected to the control device.

10. A hot pressing method, characterized in that: Using the hot pressing device according to any one of claims 1 to 8, the hot pressing method comprises: Step S10: moving the upper mold plate (21) of the hot pressing device to a first position through the driving device (30) of the hot pressing device, and allowing the upper mold plate (21) to stay for a first predetermined time; Step S20: the driving device (30) rotates the upper mold plate (21) to a second position; Step S60: The driving device (30) moves the upper mold plate (21) to a non-working position.

11. The hot pressing method according to claim 10, characterized in that Between step S20 and step S60, the hot pressing method further includes: Step S50: the driving device (30) causes the upper mold plate (21) to rotate to a first position and stay there for a second predetermined time, where the second predetermined time is greater than the first predetermined time.

12. The hot pressing method according to claim 10 or 11, characterized in that: In the case where the hot pressing device further includes a second inclined surface (215), between step S20 and step S6p0, the hot pressing method further includes: Step S30: The upper mold plate (21) of the hot pressing device is rotated to a third position by the driving device (30).

13. The hot pressing method according to claim 12, characterized in that: In the case where the hot pressing method includes step S50, the hot pressing method further includes: Step S40: Determine the number of times the upper mold plate (21) switches between the second position and the third position. If the number does not reach a threshold, execute step S20; if the number reaches a threshold, execute step S50.

14. An uninterrupted molding method, characterized in that: Using the uninterrupted molding device according to claim 9, the uninterrupted molding method includes: Step S01: controlling the traction device (150) of the uninterrupted forming device to traction the material by a predetermined distance through the control device of the uninterrupted forming device; Step S02: controlling the driving device (30) of the hot pressing device (140) of the uninterrupted forming device by the control device, so that the driving device (30) drives the upper mold plate (21) of the hot pressing device (140) of the uninterrupted forming device to move to a first position, and causing the upper mold plate (21) to stay for a third predetermined time; Step S03: controlling the driving device (30) through the control device, and the driving device (30) causes the upper mold plate (21) to rotate to a second position; Step S07: The control device controls the driving device (30), and the driving device (30) moves the upper mold plate (21) to a non-working position, and executes the step S01.

15. The uninterrupted forming method according to claim 14, characterized in that: Between step S03 and step S07, the uninterrupted molding method further includes: Step S06: the control device controls the driving device (30), and the driving device (30) causes the upper mold plate (21) to rotate to the first position and stay there for a fourth predetermined time, wherein the fourth predetermined time is greater than the third predetermined time.

16. The uninterrupted forming method according to claim 15, characterized in that: In the case where the hot pressing device further includes a second inclined surface (215), between step S03 and step S06, the uninterrupted forming method further includes: Step S04: controlling the driving device (30) through the control device, and the driving device (30) causes the upper mold plate (21) to rotate to a third position; Step S05: Determine the number of times the upper mold plate (21) switches between the second position and the third position. If the number does not reach a threshold, execute step S03; if the number reaches a threshold, execute step S06.

17. The uninterrupted forming method according to claim 14, characterized in that: The control device makes the distances between two adjacent pulling of materials different.

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