A mold and method for heating and compression molding a composite board

Abstract

This invention provides a mold and method for heating and pressing injection molding of composite sheets, including multiple positioning and forming units disposed on a moving mold. Each positioning and forming unit includes a driving device, a limiting block, and a supporting block, with the driving device and the limiting block being drivenly connected. When the upper side of the limiting block is higher than the upper side of the supporting block, the inner circumferential sides of the limiting blocks facing the supporting block in the multiple positioning and forming units, together with the upper side of the supporting block, form a positioning area. When the upper side of the limiting block is level with the upper side of the supporting block, the upper side of the limiting blocks in the multiple positioning and forming units, together with the upper side of the supporting block, form a forming area. A pressure unit is also included, comprising a liftable insert. A rapid heating and cooling device is used to regulate the temperature of the insert. This invention enables the sequential completion of positioning and fixing, injection molding, and heating and pressing processes of composite sheets within the same mold, eliminating the need to change molds or transfer workpieces multiple times, thus improving processing efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of mold structure, and in particular to a mold and method for heating and pressing composite sheet metal for injection molding. Background Technology

[0002] The applicant's product requires the combination of composite sheet material and plastic material. Specifically, the composite sheet needs to be heated and pressed into shape, and the composite sheet and plastic material need to be joined together. Current production processes involve first using a hot press to separately shape the composite sheet, then placing the composite sheet into a mold and injection molding it with the plastic material. Currently, there is no mold that can simultaneously heat-press and injection mold the composite sheet after it is placed in the mold. Summary of the Invention

[0003] The purpose of this invention is to provide a mold and method for heating and pressing injection molding of composite materials, aiming to solve the existing technical problem that it is impossible to achieve heating, pressing and injection molding of composite materials in a single mold.

[0004] To achieve the above objectives, the technical solutions of the present invention are as follows: This invention provides a mold for heating and pressing injection molding of composite sheets, comprising: a fixed mold and a movable mold, wherein the fixed mold and the movable mold are combined to form a molding cavity. Multiple positioning and forming units are disposed on the moving mold; each positioning and forming unit includes a driving device, a limiting block, and a support block disposed adjacent to the limiting block; the driving device is drivenly connected to the limiting block to drive the limiting block to move up and down relative to the support block. When the upper side of the limiting block is higher than the upper side of the support block, the inner peripheral side of the limiting block facing the support block in the plurality of positioning and forming units together with the upper side of the support block form a positioning area. The positioning area is used to place the composite board and position the periphery of the composite board. When the upper side of the limiting block is level with the upper side of the support block, the upper side of the limiting block in the plurality of positioning and forming units together with the upper side of the support block form a forming area. The forming area is used to cooperate with the forming cavity to form a plastic part on the periphery of the composite board. A pressurizing unit is disposed on the moving mold, and the pressurizing unit is located below the positioning area; the pressurizing unit includes a liftable insert; A rapid cooling and heating device is used to regulate the temperature of the insert.

[0005] Compared with the prior art, the present invention, through the cooperation of multiple positioning and forming units and pressurizing units, can complete the positioning and fixing, injection molding and heating and pressing processes of composite plates in the same mold in sequence. It eliminates the need to change the mold or transfer the workpiece multiple times, reduces the number of process steps, improves processing efficiency, avoids positioning errors caused by multiple transfers, and improves the forming accuracy of the product.

[0006] In one embodiment, the driving device is driven to connect to the limiting block via a slider; the slider moves in a first direction, the limiting block moves in a second direction, and the first direction and the second direction are set at an angle.

[0007] In one embodiment, the lower end of the limiting block is provided with a limiting inclined surface; The slider has a connecting end and a free end. The connecting end is connected to the driving device, and the free end is provided with a slider inclined surface. The slider and the limiting block are slidably engaged through the slider inclined surface and the limiting inclined surface.

[0008] In one embodiment, the slider has extension portions on both sides of its free end, and the upper side of the extension portion has the slider inclined surface. The lower end of the limiting block is provided with a limiting groove, and the inner groove surface of the limiting groove is provided with a limiting inclined surface and a supporting part located below the limiting inclined surface. The supporting part is located below the extension part and slides with the extension part.

[0009] In one embodiment, the bottom of the limiting slope is provided with a first plane; the middle position of the slider slope is provided with a second plane; When the upper side of the limiting block is higher than the upper side of the supporting block, the second plane abuts against the first plane.

[0010] In one embodiment, the upper side of the support portion is provided with a support slope, and the top of the support slope is provided with a third plane; The lower side of the extension is provided with a guide slope, and the bottom of the guide slope is provided with a fourth plane; When the upper side of the limiting block is aligned with the upper side of the supporting block, the fourth plane abuts against the third plane.

[0011] In one embodiment, the upper end of the limiting block is provided with a mounting position, and the support block is disposed on the mounting position by a limiting structure; The limiting structure includes a strip hole, a mounting hole, and a positioning element. The strip hole is disposed on the limiting block and its length direction is from top to bottom. The mounting hole is disposed on the support block. The positioning element passes through the strip hole and connects to the mounting hole.

[0012] In one embodiment, the pressurizing unit includes a pressurizing seat and a push rod. The upper side of the pressurizing seat is provided with a receiving groove, and the insert is provided in the receiving groove. A through groove is provided below the receiving groove, and the push rod is provided in the through groove. The upper end of the push rod is connected to the insert.

[0013] The present invention also provides a method for heating and pressing injection molding of composite sheets, which uses a mold for heating and pressing injection molding of composite sheets as described above, comprising: S1: The mold is opened, and multiple positioning and forming units are in the positioning state. The upper side of the limiting block is higher than the upper side of the support block. The inner circumferential side of the limiting block facing the support block and the upper side of the support block together form a positioning area. S2: Place the composite board into the positioning area, use the inner circumferential side of the limiting block to limit the outer edge of the composite board, and use the support block to support the bottom of the composite board. S3: The mold is closed, multiple positioning and forming units are in the processing state, the upper side of the limiting block is flush with the upper side of the support block, the upper side of the limiting block and the upper side of the support block in the multiple positioning and forming units together form a forming area, and the mold injects molten material into the forming area. S4: The insert is heated, and the insert moves upward to hot press the composite board. The insert is then reset after a specified time.

[0014] In one embodiment, the requirement that the upper side of the limiting block is higher than the upper side of the support block as requested in S1 is specifically that the driving device drives the slider to move, and the limiting block moves upward under the action of the slider until the second plane of the slider abuts against the first plane of the limiting block and then stops, and the upper side of the limiting block is higher than the upper side of the support block. Specifically, the requirement in S3 that the upper side of the limiting block be flush with the upper side of the support block means that the driving device drives the slider to retract, and the limiting block moves downward under the action of the slider until the third plane of the limiting block abuts against the fourth plane of the slider and then stops, so that the upper side of the limiting block is flush with the upper side of the support block. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of a mold for heating and pressing injection molding of a composite sheet material according to this application; Figure 2 This is a partial schematic diagram of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning molding units are in a positioning state). Figure 3 This is a partial schematic diagram of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning molding units are in a positioning state and the composite sheet material is placed there). Figure 4 This is a cross-sectional view of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning molding units are in a positioning state and the composite sheet material is placed there). Figure 5 This is a partial schematic diagram of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning and molding units are in the processing state). Figure 6 This is a cross-sectional view of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning molding units are in the processing state). Figure 7 yes Figure 6 Enlarged view of A in the middle; Figure 8 This is an exploded view of the positioning and forming unit of this application; Figure 9 This is a cross-sectional view of the positioning and forming unit of this application (the positioning and forming unit is in a positioning state). Figure 10 This is a partial schematic diagram of a mold for heating and pressing injection molding of a composite sheet material according to this application (multiple positioning and molding units are in the processing state).

[0016] Explanation of reference numerals in the attached figures: 10 Fixed mold, 20 Moving mold, 30 Positioning and molding unit, 310 Driving device, 320 Limiting block, 321 Limiting slope, 3211 First plane, 322 Limiting groove, 323 Support part, 3231 Supporting slope, 3232 Third plane, 324 Mounting position, 3241 Strip hole, 3242 Positioning part, 330 Support block, 340 Positioning area, 350 Molding area, 360 Slider, 361 Slider slope, 3611 Second plane, 362 Extension part, 3621 Guide slope, 3622 Fourth plane, 40 Pressurizing unit, 410 Insert, 420 Pressurizing seat, 421 Receiving groove, 510 Composite sheet, 520 Plastic part. Detailed Implementation

[0017] To better illustrate the present invention, the invention will now be described in further detail with reference to the accompanying drawings.

[0018] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0019] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0020] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0022] The applicant's product requires the combination of composite sheet material and plastic material. Specifically, the composite sheet needs to be heated and pressed into shape, and the composite sheet and plastic material need to be joined together. Current production processes involve first using hot pressing equipment to separately press the composite sheet into its desired shape, then placing the composite sheet into a mold and injection molding it together with the plastic material. Currently, there is no mold that can simultaneously heat-press and injection mold the composite sheet after it has been placed in the mold.

[0023] To solve the above problems, combined with Figures 1 to 10As shown, the present invention provides a mold for heating and pressing injection molding of composite sheet 510, comprising: a fixed mold 10 and a moving mold 20, wherein the fixed mold 10 and the moving mold 20 are combined to form a molding cavity, and a plurality of positioning molding units 30 are disposed on the moving mold 20; each positioning molding unit 30 includes a driving device 310, a limiting block 320, and a support block 330 disposed adjacent to the limiting block 320, wherein the driving device 310 is drivenly connected to the limiting block 320 to drive the limiting block 320 to move up and down relative to the support block 330; when the upper side of the limiting block 320 is higher than the upper side of the support block 330, the inner peripheral side of the limiting block 320 in the plurality of positioning molding units 30 facing the support block 330 is... Together with the upper side of the support block 330, a positioning area 340 is formed, which is used to place the composite sheet 510 and position the periphery of the composite sheet 510; when the upper side of the limiting block 320 is aligned with the upper side of the support block 330, the upper side of the limiting block 320 in the plurality of positioning molding units 30 together with the upper side of the support block 330 forms a molding area 350, which is used to cooperate with the molding cavity to form a plastic part 520 on the periphery of the composite sheet 510; a pressure unit 40 is disposed on the moving mold 20, and the pressure unit 40 is located below the positioning area 340; the pressure unit 40 includes a liftable insert 410; a rapid cooling and heating device is used to regulate the temperature of the insert 410.

[0024] Specifically, before mold closing and injection molding (i.e., mold opening), the composite sheet 510 to be processed is first placed in the positioning area 340. At this time, multiple positioning forming units 30 are in a positioning state, and the upper side of the limiting block 320 is higher than the upper side of the support block 330. After the composite sheet 510 is placed in the positioning area 340, the outer edge of the composite sheet 510 is positioned by the inner peripheral side of the limiting block 320, ensuring the relative position of the composite sheet 510 and the plastic material and preventing the composite sheet 510 from shifting position during subsequent processing. Subsequently, during the mold closing process, the driving device 310 drives the limiting block 320 to descend until the upper side of the limiting block 320 is aligned with the upper side of the support block 330. With the sides flush, multiple positioning and molding units 30 are in processing mode. The molding area 350 corresponds exactly to the periphery of the composite sheet 510. The injection molding mechanism injects molten plastic into the molding cavity, and the plastic cools and solidifies. The rapid heating and cooling equipment heats the insert 410, and the liftable insert 410 of the pressure unit 40 moves upward to apply upward pressure to the composite sheet 510 in the positioning area 340, so that the composite sheet 510 completes pre-pressing under heat and pressure. Thus, the heating and pressing molding of the composite sheet 510 and the connection molding of the composite sheet 510 with the surrounding plastic parts 520 can be completed in one go, without the need to remove the composite sheet 510 from the mold for secondary processing.

[0025] Compared with the prior art, the present invention, through the cooperation of multiple positioning and forming units 30 and pressure unit 40, can complete the positioning and fixing, injection molding and heating and pressing processes of composite plate 510 in the same mold in sequence. It eliminates the need to change the mold or transfer the workpiece multiple times, reduces the number of process steps, improves processing efficiency, avoids positioning errors caused by multiple transfers, and improves the molding accuracy of the product.

[0026] In this embodiment, the driving device 310 is driven to connect with the limiting block 320 via a slider 360. The slider 360 moves in a first direction, and the limiting block 320 moves in a second direction, with the first and second directions at an angle. The first direction is horizontal, and the second direction is vertical. When the slider 360 slides horizontally under the action of the driving device 310, it drives the limiting block 320 to rise and fall vertically. This converts the horizontal driving force of the driving device 310 into the vertical rising and falling motion of the limiting block 320, allowing the driving device 310 to be installed outside the mold as needed, adapting to the limited installation space inside the mold, and ensuring stable and reliable transmission.

[0027] Furthermore, the lower end of the limiting block 320 is provided with a limiting inclined surface 321; the slider 360 has a connecting end and a free end, the connecting end is connected to the driving device 310, and the free end is provided with a slider inclined surface 361. The slider 360 and the limiting block 320 are in sliding cooperation through the slider inclined surface 361 and the limiting inclined surface 321. When the slider 360 is driven horizontally by the driving device 310, the limiting block 320 is gradually pushed upward to complete the extension action under the sliding cooperation of the slider inclined surface 361 and the limiting inclined surface 321. At this time, the upper side of the limiting block 320 is higher than the upper side of the support block 330. Similarly, when the slider 360 moves in the opposite direction, the limiting block 320 falls back downward to complete the retraction action. At this time, the upper side of the limiting block 320 is level with the upper side of the support block 330. This inclined surface cooperation transmission structure is simple and does not require additional complex conversion transmission components. It can further save the installation space inside the mold. The transmission process is smooth and the action response speed is fast. It can accurately control the lifting stroke of the limiting block 320 and ensure the positioning accuracy of the composite plate 510.

[0028] Furthermore, the slider 360 has extension portions 362 on both sides of its free end, and the upper side of the extension portion 362 has the slider inclined surface 361; the lower end of the limiting block 320 has a limiting groove 322, and the inner groove surface of the limiting groove 322 has the limiting inclined surface 321 and a support portion 323 located below the limiting inclined surface 321. The support portion 323 is located below the extension portion 362 and slides in cooperation with the extension portion 362. The free end of the slider 360 extends into the limiting groove 322, and the support portion 323 can limit and guide the extension portion 362, further improving the stability of the lifting and lowering movement of the limiting block 320 and preventing the limiting block 320 from deviating during movement.

[0029] Furthermore, the bottom of the limiting inclined surface 321 is provided with a first plane 3211; the middle position of the slider inclined surface 361 is provided with a second plane 3611; when the upper side of the limiting block 320 is higher than the upper side of the support block 330, the second plane 3611 abuts against the first plane 3211. When the driving device 310 drives the slider 360 to move inward in the horizontal direction, the limiting block 320 moves upward accordingly. When the second plane 3611 and the first plane 3211 abut against each other, a hard positioning is formed between the slider 360 and the limiting block 320, which can directly lock the extension height of the limiting block 320 without the need for an additional stroke detection device to limit it. This simplifies the mold structure and ensures that the extension height of the limiting block 320 is consistent in each operation, avoiding excessive movement of the slider 360 that causes the positioning position of the composite plate 510 to shift, further improving the positioning accuracy and operational reliability.

[0030] Furthermore, the upper side of the supporting part 323 is provided with a supporting slope 3231, and the top of the slope of the supporting slope 3231 is provided with a third plane 3232; the lower side of the extension part 362 is provided with a guide slope 3621, and the bottom of the slope of the guide slope 3621 is provided with a fourth plane 3622; when the upper side of the limiting block 320 is flush with the upper side of the supporting block 330, the fourth plane 3622 abuts against the third plane 3232. When the limiting block 320 retracts, the fourth plane 3622 and the third plane 3232 fit together, forming a hard positioning structure, which can accurately lock the retraction height of the limiting block 320, ensuring that the upper side of the limiting block 320 and the upper side of the supporting block 330 remain flat, eliminating the need for an additional detection structure to confirm whether the limiting block 320 is in place, further simplifying the mold structure, and ensuring that the retraction position accuracy of the limiting block 320 is consistent in each operation, improving the stability of continuous mold operation and the yield of finished products. In addition, the inclined surfaces of the guide slope 3621 and the supporting slope 3231 can be used to guide the movement and prevent deviation during the movement.

[0031] In this embodiment, the upper end of the limiting block 320 is provided with a mounting position 324, and the support block 330 is disposed on the mounting position 324 through a limiting structure. The limiting structure includes a strip hole 3241, a mounting hole, and a positioning member 3242. The strip hole 3241 is disposed on the limiting block 320 and its length direction is from top to bottom. The mounting hole is disposed on the support block 330, and the positioning member 3242 passes through the strip hole 3241 and connects to the mounting hole. This embodiment utilizes the limiting of the strip hole 3241 and the positioning member 3242 to ensure that the limiting block 320 moves vertically upward and downward, avoiding deviation. Furthermore, by setting the strip hole 3241, when the positioning member 3242 is located at the lower end of the strip hole 3241, the upper side of the limiting block 320 is higher than the upper side of the support block 330; when the positioning member 3242 is located at the lower end of the strip hole 3241, the upper side of the limiting block 320 is level with the upper side of the support block 330; ensuring that the lifting position of the limiting block 320 is consistent in each operation.

[0032] In this embodiment, the pressurizing unit 40 includes a pressurizing seat 420 and a push rod. The upper side of the pressurizing seat 420 is provided with a receiving groove 421, within which the insert 410 is disposed. A through groove is provided below the receiving groove 421, within which the push rod is disposed, with its upper end connected to the insert 410. When pressure needs to be applied to a localized area of ​​the composite material 510, the push rod extends upward, pushing the heated insert 410 upward, causing it to protrude beyond the upper side of the pressurizing seat 420, applying additional pressure to the corresponding location on the composite material 510. When pressure is no longer required on the composite material 510, the push rod causes the insert 410 to fall back to its original position, detaching it from the composite material 510. The extension and retraction of the push rod can be controlled by the mold structure, allowing for flexible adjustment of the insert 410's extension height to meet the localized pressurization requirements under different processing conditions.

[0033] In this embodiment, the rapid heating and cooling device can introduce a high-temperature medium (such as steam, high-pressure hot water, etc.) into the water channel inside the insert 410 to heat up the insert 410 by means of heat transfer; after the hot pressing is completed, it switches to a low-temperature medium to cool down the insert 410 quickly.

[0034] In this embodiment, the driving device 310 may be a hydraulic cylinder.

[0035] The present invention also provides a method for heating and pressing injection molding of composite sheet 510, which uses a mold for heating and pressing injection molding of composite sheet 510 as described above, comprising: S1: The mold is opened, and multiple positioning and forming units 30 are in the positioning state. The upper side of the limiting block 320 is higher than the upper side of the support block 330. The inner peripheral side of the limiting block 320 facing the support block 330 and the upper side of the support block 330 together form the positioning area 340. The limiting block 320 can perform precise and stable positioning operation on the composite plate 510, effectively preventing positional deviation caused by operation error or external force interference during the process of placing the composite plate 510 into the mold, thereby ensuring the high accuracy of the molten material injection position in the subsequent injection molding process. S2: Place the composite board 510 into the positioning area 340, use the inner circumferential side of the limiting block 320 to limit the outer edge of the composite board 510, and use the support block 330 to support the bottom of the composite board 510. S3: The mold is closed, and multiple positioning and forming units 30 are in the processing state. The upper side of the limiting block 320 is flush with the upper side of the support block 330. The upper side of the limiting block 320 and the upper side of the support block 330 in the multiple positioning and forming units 30 together form the forming area 350. Molten material is injected into the forming area 350 by the mold. The composite plate 510 and the injected molten material achieve full contact and tight fit, which enhances the interface bonding strength between the two. After the mold is closed, the limiting block 320 and the support block 330, together with the fixed mold 10 and the rear mold, jointly form a complete forming cavity. The upper side of the limiting block 320 and the upper side of the support block 330 remain flush, which can effectively prevent the high-temperature molten material from flowing out due to pressure during the injection molding process, and significantly reduce the probability of forming defects such as flash and burrs. S4: The insert 410 is heated, and the insert 410 moves upward to hot-press the composite sheet 510, and the insert 410 returns to its original position after a specified time. The insert 410 is heated before injection molding, and appropriate hot pressing is applied in the mold-closed state to hot-press the composite sheet 510 at a local position.

[0036] In this embodiment, the requirement that the upper side of the limiting block 320 is higher than the upper side of the support block 330 as specified in S1 is as follows: the driving device 310 drives the slider 360 to move, and the limiting block 320 moves upward under the action of the slider 360 until the second plane 3611 of the slider 360 abuts against the first plane 3211 of the limiting block 320 and stops. The upper side of the limiting block 320 is higher than the upper side of the support block 330. When the driving device 310 drives the slider 360 to move inward in the horizontal direction, the limiting block 320 moves upward accordingly. When the second plane 3611 and the first plane 3211 abut against each other, a hard positioning is formed between the slider 360 and the limiting block 320, which can directly lock the extension height of the limiting block 320 without the need for an additional stroke detection device to limit it. This simplifies the mold structure and ensures that the extension height of the limiting block 320 is consistent in each operation, avoiding excessive movement of the slider 360 that causes the positioning position of the composite plate 510 to shift, and further improving the positioning accuracy and operation reliability.

[0037] Specifically, regarding the requirement in S3 that the upper side of the limiting block 320 is flush with the upper side of the support block 330, the driving device 310 drives the slider 360 to retract, and the limiting block 320 moves downward under the action of the slider 360 until the third plane 3232 of the limiting block 320 abuts against the fourth plane 3622 of the slider 360, at which point the upper side of the limiting block 320 is flush with the upper side of the support block 330. When the limiting block 320 retracts, the fourth plane 3622 and the third plane 3232 fit together, forming a hard positioning structure that can accurately lock the retraction height of the limiting block 320, ensuring that the upper side of the limiting block 320 remains flat with the upper side of the support block 330, without the need for an additional detection structure to confirm whether the limiting block 320 has returned to its original position.

[0038] This invention is not limited to the above-described embodiments. If any modifications or variations to this invention do not depart from the spirit and scope of this invention, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this invention, then this invention also intends to include such modifications and variations.

Claims

1. A mold for heating and pressing injection molding of composite sheet metal, comprising a fixed mold and a movable mold, wherein the fixed mold and the movable mold are combined to form a molding cavity, characterized in that, Also includes: Multiple positioning and forming units are disposed on the moving mold; The positioning and forming unit includes a driving device, a limiting block, and a support block disposed adjacent to the limiting block. The driving device is driven to the limiting block to drive the limiting block to move up and down relative to the support block. When the upper side of the limiting block is higher than the upper side of the support block, the inner peripheral side of the limiting block facing the support block in the plurality of positioning and forming units together with the upper side of the support block form a positioning area. The positioning area is used to place the composite board and position the periphery of the composite board. When the upper side of the limiting block is level with the upper side of the support block, the upper side of the limiting block in the plurality of positioning and forming units together with the upper side of the support block form a forming area. The forming area is used to cooperate with the forming cavity to form a plastic part on the periphery of the composite board. A pressurizing unit is disposed on the moving mold, and the pressurizing unit is located below the positioning area; the pressurizing unit includes a liftable insert; A rapid cooling and heating device is used to regulate the temperature of the insert.

2. The mold for heating and pressing injection molding of the composite sheet according to claim 1, characterized in that: The driving device is driven to connect to the limiting block via a slider; the slider moves in a first direction, the limiting block moves in a second direction, and the first direction and the second direction are set at an angle.

3. The mold for heating and pressing injection molding of the composite sheet according to claim 2, characterized in that: The lower end of the limiting block is provided with a limiting inclined surface; The slider has a connecting end and a free end. The connecting end is connected to the driving device, and the free end is provided with a slider inclined surface. The slider and the limiting block are slidably engaged through the slider inclined surface and the limiting inclined surface.

4. The mold for heating and pressing injection molding of the composite sheet according to claim 3, characterized in that: The slider has extension portions on both sides of its free end, and the upper side of the extension portion has the slider inclined surface. The lower end of the limiting block is provided with a limiting groove, and the inner groove surface of the limiting groove is provided with a limiting inclined surface and a supporting part located below the limiting inclined surface. The supporting part is located below the extension part and slides with the extension part.

5. The mold for heating and pressing injection molding of the composite sheet according to claim 4, characterized in that: The bottom of the limiting inclined surface is provided with a first plane; the middle position of the slider inclined surface is provided with a second plane; When the upper side of the limiting block is higher than the upper side of the supporting block, the second plane abuts against the first plane.

6. The mold for heating and pressing injection molding of the composite sheet according to claim 4 or 5, characterized in that: The upper side of the support is provided with a support slope, and the top of the support slope is provided with a third plane; The lower side of the extension is provided with a guide slope, and the bottom of the guide slope is provided with a fourth plane; When the upper side of the limiting block is aligned with the upper side of the supporting block, the fourth plane abuts against the third plane.

7. The mold for heating and pressing injection molding of the composite sheet according to claim 1, characterized in that: The upper end of the limiting block is provided with an installation position, and the support block is set on the installation position through a limiting structure; The limiting structure includes a strip hole, a mounting hole, and a positioning element. The strip hole is disposed on the limiting block and its length direction is from top to bottom. The mounting hole is disposed on the support block. The positioning element passes through the strip hole and connects to the mounting hole.

8. The mold for heating and pressing injection molding of the composite sheet according to claim 1, characterized in that: The pressurizing unit includes a pressurizing seat and a push rod. The upper side of the pressurizing seat is provided with a receiving groove, and the insert is provided in the receiving groove. A through groove is provided below the receiving groove, and the push rod is provided in the through groove. The upper end of the push rod is connected to the insert.

9. A method for heating and pressing injection molding of composite sheet metal, wherein the method utilizes the mold for heating and pressing injection molding of composite sheet metal as described in any one of claims 1-8, characterized in that, include: S1: The mold is opened, and multiple positioning and forming units are in the positioning state. The upper side of the limiting block is higher than the upper side of the support block. The inner circumferential side of the limiting block facing the support block and the upper side of the support block together form a positioning area. S2: Place the composite board into the positioning area, use the inner circumferential side of the limiting block to limit the outer edge of the composite board, and use the support block to support the bottom of the composite board. S3: The mold is closed, multiple positioning and forming units are in the processing state, the upper side of the limiting block is flush with the upper side of the support block, the upper side of the limiting block and the upper side of the support block in the multiple positioning and forming units together form a forming area, and the mold injects molten material into the forming area. S4: The insert is heated, and the insert moves upward to hot press the composite board. The insert is then reset after a specified time.

10. The method for heating and pressing / injection molding of composite sheets according to claim 9, characterized in that: Specifically, the requirement in S1 that the upper side of the limiting block is higher than the upper side of the support block means that the driving device drives the slider to move, and the limiting block moves upward under the action of the slider until the second plane of the slider abuts against the first plane of the limiting block and then stops. The upper side of the limiting block is higher than the upper side of the support block. Specifically, the requirement in S3 that the upper side of the limiting block be flush with the upper side of the support block means that the driving device drives the slider to retract, and the limiting block moves downward under the action of the slider until the third plane of the limiting block abuts against the fourth plane of the slider and then stops, so that the upper side of the limiting block is flush with the upper side of the support block.

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