Thermoplastic composite material forming mold and thermoplastic product processing method

Abstract

The present invention discloses a thermoplastic composite material forming mold and a processing method for thermoplastic products, which relate to the field of thermoplastic forming technology. In the thermoplastic composite material forming mold, a lower mold base and an upper mold base can be attached to each other under the drive of a molding machine, so that a second cavity of the lower mold base and a first cavity of the upper mold base are jointly enclosed to form a molding cavity. The molding cavity has a main material area and an auxiliary material area arranged outside the main material area. The lower end surface of the lower mold base is provided with an ejection hole connected to the second cavity, and the ejection hole is arranged corresponding to the auxiliary material area. An ejector pin is movably installed in the ejection hole in the vertical direction. The ejector pin has a first position and a second position. In the first position, at least a portion of the ejector pin is located in the ejection hole, and a first clearance gap is formed between the upper end surface of the ejector pin and the bottom wall of the second cavity. In the second position, the ejector pin protrudes upward from the ejection hole. The position of the ejection hole forms a stress release point. The first clearance gap prevents overflowing glue from contacting the ejector pin and causing jamming, thereby improving product yield.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoplastic forming, in particular to a thermoplastic composite material forming die and a thermoplastic product processing method. Background Art

[0002] Conventional methods for removing thermoplastic composites after compression molding include pneumatic-assisted removal and conventional ejection mechanisms (ejectors, ejector pins, etc.). Pneumatic-assisted removal generally makes it difficult to control the airflow to ensure uniform force distribution on the product, resulting in unstable demolding and requiring manual removal. This results in high labor costs and a longer molding cycle, hindering efficient mass production. For some ultra-thin products, the ejection mechanism can easily cause product deformation during the ejection process, increasing the risk of imbalanced ejection. Summary of the Invention

[0003] The main purpose of the present invention is to provide a thermoplastic composite material molding mold and a processing method for thermoplastic products. In order to alleviate the deformation of ultra-thin products caused by the ejection mechanism during the ejection process, a non-closed cavity is used for processing, so that the ejection hole can be connected to the cavity, so that glue overflow will occur under the action of pressure during the molding process.

[0004] However, during the molding process, composite materials can easily enter the ejector pin clearance under high molding pressure, increasing the risk of ejector mechanism jamming and preventing stable and continuous mass production. Therefore, proper clearance between the ejector pin and the cavity is required to prevent ejector pin jamming.

[0005] To achieve the above-mentioned object, the present invention provides a thermoplastic composite material forming mold, comprising:

[0006] A thermoplastic composite material forming mold, characterized in that the thermoplastic composite material forming mold comprises:

[0007] an upper die base, adapted to be fixed to a top plate of a molding machine, wherein the upper die base is formed with a first die cavity having an open lower side;

[0008] A lower die base is used to be fixed to the bottom plate of the molding machine, the lower die base is formed with a second die cavity with an open upper side, the lower die base and the upper die base can be affixed to each other under the drive of the molding machine, so that the second die cavity and the first die cavity together enclose a molding cavity, the molding cavity has a main material area and an auxiliary material area arranged outside the main material area, and the lower end surface of the lower die base is provided with an ejection hole communicating with the second die cavity, and the ejection hole is arranged corresponding to the auxiliary material area;

[0009] The ejection structure includes an ejector rod, which is movably installed in the ejection hole along the up and down directions. The ejector rod has a first position and a second position. In the first position, at least a portion of the ejector rod is in the ejection hole, and a first escape gap is formed between the upper end surface of the ejector rod and the bottom wall of the second cavity. In the second position, the ejector rod protrudes upward from the ejection hole.

[0010] In one embodiment, the first space avoidance gap is h1, wherein 3 mm ≤ h1 ≤ 5 mm.

[0011] In one embodiment, a second avoidance gap is defined between the peripheral side surface of the ejector pin and the hole wall of the ejection hole, and the second avoidance gap is L1, wherein 0.1 mm<L1≤0.25 mm.

[0012] In one embodiment, the ejection structure further includes a fixed plate, which is arranged at the lower end of the lower mold base, and a guide hole is provided on the fixed plate corresponding to the ejection hole. The lower end of the ejector rod is movably inserted into the guide hole, and the upper end of the ejector rod is movably inserted into the ejection hole. A second avoidance gap is defined between the peripheral side surface of the ejector rod and the hole wall of the ejection hole, and a guide gap is defined between the peripheral side surface of the ejector rod and the guide hole, and the guide gap is smaller than the second avoidance gap.

[0013] In one embodiment, the length of the ejector rod is H, and when in the first position, the length of the portion of the ejector rod in the ejection hole is H1, wherein H1 / H≤1 / 4.

[0014] In one embodiment, the guide gap is L2, and L2≤0.1 mm.

[0015] In one embodiment, when in the second position, the length of the portion of the ejector pin protruding from the ejection hole is h2, wherein h2 ≥ 3 mm.

[0016] In one embodiment, a plurality of main material regions are provided in the horizontal direction, and the auxiliary material region is arranged around the outside of the plurality of main material regions;

[0017] There are multiple ejection holes, and at least some of the ejection holes are located between two adjacent main material areas;

[0018] A plurality of push rods are correspondingly provided.

[0019] In one embodiment, a plurality of ejection holes are provided, and the plurality of ejection holes form at least three ejection groups, wherein one ejection group corresponds to the middle portion of the second cavity, and the other two ejection groups correspond to opposite sides of the second cavity;

[0020] The number of ejection holes in the ejection group located in the middle is smaller than the number of ejection holes in the ejection group located at the side;

[0021] A plurality of push rods are correspondingly provided.

[0022] The present invention also proposes a processing method for thermoplastic products, based on a thermoplastic product processing production line, the thermoplastic product processing production line includes a molding machine and a punching device, the molding machine is provided with a thermoplastic composite material forming mold, the thermoplastic composite material forming mold includes an upper mold base, a lower mold base and an ejection structure, the upper mold base is used to be fixed to the top plate of the molding machine, the upper mold base forms a first cavity open at the lower side; the lower mold base is used to be fixed to the bottom plate of the molding machine, the lower mold base forms a second cavity open at the upper side, the lower mold base and the upper mold base can be fitted with each other under the drive of the molding machine, so that the second cavity and the first cavity are jointly enclosed to form a molding cavity, the molding cavity has a main material area and a An auxiliary material area, an ejection hole communicating with the second cavity is formed on the lower end surface of the lower mold base, and the ejection hole is arranged corresponding to the auxiliary material area; the ejection structure includes an ejector rod, which is movably installed in the ejection hole along the up and down directions, and the ejector rod has a first position and a second position. In the first position, at least a portion of the ejector rod is in the ejection hole, and a first avoidance gap is formed between the upper end surface of the ejector rod and the bottom wall of the second cavity. In the second position, the ejector rod protrudes upward from the ejection hole. A plurality of main material areas are arranged in the horizontal direction in the thermoplastic composite material forming mold, and the auxiliary material area is annularly arranged outside the plurality of main material areas. A plurality of ejection holes and ejector rods are arranged in a one-to-one correspondence.

[0023] The processing method of the thermoplastic product comprises the following steps:

[0024] A molded part is obtained by processing a thermoplastic composite material molding die, wherein the molded part includes a plurality of integrally formed main bodies and an auxiliary material covering the outer sides of the plurality of main bodies, wherein the main body is formed in a main material region of the molding cavity, and the auxiliary material is formed in an auxiliary material region of the molding cavity;

[0025] Controlling the punching device to operate according to preset parameters to separate the plurality of main bodies from the auxiliary materials;

[0026] The plurality of cut bodies are taken away to complete the processing.

[0027] In the technical solution of the present invention, a molding cavity is formed when the upper mold base and the lower mold base are combined. In the molding cavity, the main material area is used to correspond to the main body of the molded product, and the auxiliary material area is correspondingly covered on the periphery of the main material area, so as to correspond to the outer side of the molded product. As an auxiliary material, it needs to be cut off in the later process. Due to the auxiliary material area of ​​the ejection hole, part of the resin will overflow during the molding process and flow into the ejection hole. Based on the setting of the first avoidance gap, the overflowed resin will not contact the ejector pin. After molding, the ejector pin pushes the overflowed glue upward and then drives the entire product to separate from the lower mold base. The position of the ejection hole forms a stress release point, which can weaken the connection force between the product and the lower mold base. The first avoidance gap can also avoid the overflowed glue from contacting the ejector pin to cause jamming. During ejection, the ejector pin corresponds to the auxiliary material position and will not affect the main body of the product, thereby improving the stability of ejection and the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of an embodiment of a thermoplastic composite material forming mold provided by the present invention (mold closing state);

[0030] Figure 2 for Figure 1 Schematic diagram of the structure of the thermoplastic composite material forming mold (mold opening state);

[0031] Figure 3 for Figure 2 Schematic diagram of the top view of the middle and lower die base;

[0032] Figure 4 This is a schematic flow chart of the processing method of the thermoplastic product provided by the present invention.

[0033] Description of Figure Numbers:

[0034] 1. Upper die base; 2. Lower die base; 21. Ejector hole; 21a. First ejector hole; 21b. Second ejector hole; 3. Ejector structure; 31. Ejector pin; 32. Fixing plate; 321. Guide hole; 10. Main material area; 20. Auxiliary material area; a. Molding cavity.

[0035] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that if a directional indication is involved in an embodiment of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] Conventional methods for removing thermoplastic composites after compression molding include pneumatic-assisted removal and conventional ejection mechanisms (ejectors, ejector pins, etc.). Pneumatic-assisted removal generally involves difficult-to-control airflow to ensure uniform force distribution on the product, resulting in unstable demolding and requiring manual removal. This results in high labor costs and a longer molding cycle, hindering efficient mass production. For ultra-thin products, such as those with wall thicknesses less than 0.3mm, the use of ejection mechanisms can easily cause product deformation during the ejection process, increasing the risk of imbalanced ejection.

[0040] To mitigate deformation of ultra-thin products caused by the ejection mechanism during the ejection process, the present invention utilizes a non-enclosed cavity for processing, allowing the ejection hole to communicate with the cavity. However, during the molding process, composite materials, under high molding pressure, can easily enter the ejector pin clearance, increasing the risk of ejector mechanism jamming and preventing stable and continuous mass production. Therefore, the present invention also avoids ejector pin jamming by rationally arranging clearances between the ejector pin and the cavity.

[0041] Please refer to Figures 1 to 2The thermoplastic composite material forming mold includes an upper mold base 1, a lower mold base 2 and an ejection structure 3. The upper mold base 1 is used to be fixed to the top plate of the molding machine. A first cavity with an open bottom is formed on the upper mold base 1; the lower mold base 2 is used to be fixed to the bottom plate of the molding machine. A second cavity with an open top is formed on the lower mold base 2. The lower mold base 2 and the upper mold base 1 can be fitted together under the drive of the molding machine so that the second cavity and the first cavity are enclosed together to form a molding cavity a. The molding cavity a has a main material area 10 and an auxiliary cavity arranged outside the main material area 10. The material area 20, the lower end surface of the lower die base 2 is provided with an ejection hole 21 connected to the second cavity, and the ejection hole 21 is arranged corresponding to the auxiliary material area 20; the ejection structure 3 includes a ejector rod 31, and the ejector rod 31 is movably installed in the ejection hole 21 along the up and down directions. The ejector rod 31 has a first position and a second position. In the first position, at least a part of the ejector rod 31 is in the ejection hole 21, and a first avoidance gap is formed between the upper end surface of the ejector rod 31 and the bottom wall of the second cavity. In the second position, the ejector rod 31 protrudes upward from the ejection hole 21.

[0042] In the technical solution of the present invention, a molding cavity a is formed when the upper mold base 1 and the lower mold base 2 are combined. In the molding cavity a, the main material area 10 is used to correspond to the main body of the molded product, and the auxiliary material area 20 is correspondingly covered on the periphery of the main material area 10, thereby correspondingly being molded on the outside of the main body of the product. As an auxiliary material, it needs to be cut off in the later process. Since the ejection hole 21 corresponds to the auxiliary material area 20, during the molding process, part of the resin will overflow and flow into the ejection hole 21. Based on the setting of the first avoidance gap, the overflowed resin will not contact the ejector pin 31. After molding, the ejector pin 31 pushes the overflowed glue upward and then drives the entire product to separate from the lower mold base 2. The position of the ejection hole 21 forms a stress release point, which can weaken the connection force between the product and the lower mold base 2. The first avoidance gap can also prevent the overflowed glue from contacting the ejector pin 31 and causing jamming. During ejection, the ejector pin 31 corresponds to the auxiliary material position and will not affect the main body of the product, thereby improving the ejection stability and product yield.

[0043] During the thermoplastic process, the mold structure generally cycles at a mold temperature of 220°C to 90°C. Based on the properties of the composite material, the resin density, and the cavity temperature during injection, the resin will flow in the molding cavity a, but the flow rate is slow. Therefore, although the molding cavity a is in an unsealed state due to the connectivity of the ejection hole 21 and the first avoidance gap, the volume overflowing into the first avoidance gap is limited. Therefore, through testing and simulation analysis, the size of the first avoidance gap is reasonably set to avoid contact between the ejector pin 31 and the overflowing glue. In this embodiment, the first avoidance gap is h1, where 3mm≤h1≤5mm. h1 can be set to 3mm, 4mm, 4.5mm, or 5mm. This size design can prevent the overflowing glue at the upper end of the ejection hole 21 from contacting the ejector pin 31, thereby causing the ejector pin 31 to become stuck after thermal curing, while also not affecting the up and down reciprocating movement of the ejector pin 31.

[0044] Because the mold is exposed to high temperatures for extended periods during use, thermal expansion may occur in such conditions. This means that the walls of ejector hole 21 may expand and squeeze, causing the local diameter of ejector hole 21 to shrink. This mold expansion can increase the risk of ejector pin 31 becoming stuck, preventing ejector pin 31 from being ejected smoothly. Therefore, in some embodiments, a second clearance gap is defined between the circumferential side of ejector pin 31 and the wall of ejector hole 21. The second clearance gap is L1, where 0.1mm < L1 ≤ 0.25mm. This second clearance gap is a single-sided gap between ejector pin 31 and ejector hole 21. By reasonably limiting the size of this second clearance gap, expansion space is reserved for lower mold base 2, ensuring that even if the wall of ejector hole 21 expands, it will not interfere with the movement of ejector pin 31. L1 can be 0.15mm, 0.22mm, or 0.25mm.

[0045] Furthermore, the ejection structure 3 also includes a fixing plate 32, which is arranged at the lower end of the lower mold base 2. The function of the fixing plate 32 is to guide and support the ejector rod 31. A guide hole 321 is provided on the fixing plate 32 corresponding to the ejection hole 21. The lower end of the ejector rod 31 is movably inserted into the guide hole 321, and the upper end of the ejector rod 31 is movably inserted into the ejection hole 21. The lower end of the ejector rod 31 is connected to the fixing plate 32 through a corresponding connecting structure. The ejector rod 31 can be reciprocated and lifted under the action of the driving structure. The fixing plate 32 can be set by material or a heat insulation plate can be added between the fixing plate 32 and the lower mold base 2 to avoid high-temperature expansion of the fixing plate 32. Therefore, the gap between the guide hole 321 and the ejector rod 31 needs to be precisely set to ensure the linear guide accuracy of the ejector rod 31 and avoid displacement and shaking of the ejector rod 31 during the ejection process.

[0046] Specifically, a second clearance gap is defined between the side surface of ejector pin 31 and the wall of ejection hole 21, and a guide gap is defined between the side surface of ejector pin 31 and guide hole 321. The guide gap is smaller than the second clearance gap. The second clearance gap is designed to mitigate the effects of thermal expansion of lower die base 2. Therefore, the second clearance gap is larger than the guide gap. This arrangement ensures both a guide fit and the ability to accommodate thermal expansion and deformation of the mold.

[0047] It should be noted that the above-mentioned guide clearance refers to the single-side clearance, and the guide clearance is L2, L2≤0.1mm, so as to meet the matching accuracy requirements.

[0048] The guiding effect of ejector pin 31 during its movement is affected not only by the size of guide hole 321 but also by the length of fit between ejector pin 31 and guide hole 321. If a larger portion of ejector pin 31 is located within ejection hole 21, the ejector pin 31 will be uncontrolled for a longer period during the ejection process, and the upper end will also be at greater risk of shaking. Therefore, in some embodiments, the total length of ejector pin 31 is H, and in the first position, the length of the portion of ejector pin 31 located within ejection hole 21 is H1, where H1 / H ≤ 1 / 4. By properly adjusting the ratio of the size of ejector pin 31 located within ejection hole 21 to the total length of ejector pin 31, the fit between guide hole 321 and ejector pin 31 can be improved, thereby enhancing ejection accuracy.

[0049] During mold closing, ejector pin 31 is in the first position. After processing is complete, upper die base 1 moves upward, leaving the molded product on lower die base 2, driving ejector pin 31 upward. Therefore, the travel of ejector pin 31 needs to be greater than the size of the first clearance gap to ensure that the product is lifted and separated from lower die base 2. In this embodiment, in the second position, the length of the portion of ejector pin 31 protruding from ejection hole 21 is h2, where h2 ≥ 3mm. By limiting the protruding height of ejector pin 31 in the second position, the upward travel of ejector pin 31 is indirectly limited, thereby ensuring that the ejection force exerted by ejector pin 31 on the product is consistent and that the product is completely separated from the mold surface.

[0050] It should be noted that the ejector pin 31 and the ejection hole 21 correspond one to one to form a matching group. Multiple matching groups can be set, and the arrangement of multiple matching groups can be determined according to the size and specific distribution of the molding cavity a. For example, multiple matching groups can be arranged along the circumferential direction, multiple matching groups can also be arranged along a straight line, and multiple matching groups can also be arranged in an array. The present invention does not impose any restrictions on this.

[0051] The main material area 10 of the molding cavity a corresponds to the main body of the molded product, and the auxiliary material area 20 of the molding cavity a corresponds to the molding auxiliary material. Please refer to Figure 3 Multiple main material regions 10 are arranged horizontally, and auxiliary material regions 20 are arranged around the outer sides of the multiple main material regions 10. This allows multiple bodies to be formed in a single thermoplastic molding process, improving processing efficiency. It should be understood that the auxiliary material region 20 is arranged around the periphery of each main material region 10. Correspondingly, multiple ejection holes 21 are provided, at least some of which are located between two adjacent main material regions 10. Multiple ejector pins 31 are provided accordingly. This arrangement facilitates the ejector pins 31 to separate the two adjacent bodies from the lower die base 2 during ejection, thereby ensuring the ejection effect.

[0052] It should be understood that the multiple main material regions 10 can be arranged along a straight line, or arranged in multiple columns, or arranged in a staggered manner, and the present invention does not impose any limitation on this.

[0053] The location and number of the ejection holes 21 can be reasonably set according to the arrangement of the main material area 10 and the size of the molding cavity a. In some embodiments, there are multiple ejection holes 21, and the multiple ejection holes 21 form at least three ejection groups, one of which corresponds to the middle of the second cavity, and the other two ejection groups correspond to the opposite sides of the second cavity. At this time, the three ejection groups are arranged at intervals along a straight line, and the number of ejection holes 21 in the ejection group located in the middle is less than the number of ejection holes 21 in the ejection group located on the side, and multiple ejector rods 31 are provided corresponding to the ejection holes 21. Since the number of ejection holes 21 in the middle ejection group is different from that in the side ejection group, they should be staggered in arrangement, so that the ejection holes 21 in the middle ejection group and the ejection holes 21 in the side ejection groups can cooperate with each other to form multiple triangular positioning structures. For example, please refer to Figure 3 The ejection group in the middle includes two first ejection holes 21a, and each side ejection group includes four second ejection holes 21b. The first ejection holes 21a and the second ejection holes 21b are staggered. Specifically, the four second ejection holes 21b and the two first ejection holes 21a together form two groups of triangular positioning structures, thereby providing stable ejection force when the product is ejected.

[0054] Please refer to Figures 1 to 2 , in an embodiment of the present invention,

[0055] Initially, the end surface of the ejector pin 31 is 5 mm lower than the cavity surface, and there is a 0.1 mm gap on one side in the diameter direction;

[0056] During the mold closing process, after the thermoplastic resin reaches the plasticizing temperature, it is molded under the molding pressure. At the ejection hole 21, part of the resin is squeezed into the first avoidance gap of the ejection hole 21. Because the molding temperature will not reach the temperature at which the resin is completely melted, and the pressure of the resin at the ejection hole 21 is only subjected to unidirectional pressure, there will only be a small amount of resin overflow, and the first avoidance gap will not be filled. Taking PC-based resin as an example, the molding temperature is 200~220℃, which is far from the temperature of 280~320℃ at which PC resin can flow. During the molding process, only a small amount of resin will be squeezed into the ejection hole 21, so it is only in the first avoidance gap, and will not contact the top surface and the surrounding side surfaces of the ejector pin 31, causing the ejection of the ejector pin 31 to become stuck.

[0057] The mold is opened, and the product remains on the mold surface on the side of the lower mold base 2 corresponding to the ejector pin 31. The ejector pin 31 is lifted. Because the travel of the ejector pin 31 is greater than the first clearance gap, during the ejection process, the ejector pin 31 first contacts the solidified resin that has overflowed into the ejection hole 21. As the ejector pin 31 continues to eject, the product is pulled out of the mold surface. At this point, the product can be removed smoothly with the help of automated equipment. The ejector pin 31 is reset, and the next molding process can be carried out after the upper and lower mold bases 1 and 2 are closed.

[0058] The primary purpose of this invention is to provide an ejection solution for the molding of ultra-thin thermoplastic fiber composites. Based on conventional ejector mechanisms, the design of the ejector structure 3 is optimized according to the molding characteristics of thermoplastic fiber composites. By designing clearances in the vertical and radial directions of ejector pin 31, this prevents resin overflow from contacting ejector pin 31 and causing it to become stuck. It also prevents mold expansion and deformation from squeezing ejector pin 31 and causing it to become stuck. This structure enables stable ejection of ultra-thin thermoplastic fiber composites after compression molding, avoiding the frequent jamming, low utilization, and high labor input associated with conventional ejector mechanisms. This allows the entire molding process to achieve automated, steady-state production, reducing labor input, improving production utilization, and lowering production investment and costs.

[0059] The present application provides a method for processing a thermoplastic product. Figure 4 This is a flow chart of an embodiment of a method for processing a thermoplastic product of the present application.

[0060] The processing method of thermoplastic products includes the following steps:

[0061] Step S10, obtaining a molded part by forming a thermoplastic composite material into a mold;

[0062] It should be noted that a molded part comprises multiple integrally formed main bodies and a coating of auxiliary materials. In the corresponding mold structure, the main material region 10 of the molding cavity a corresponds to the molded main bodies, and the auxiliary material region 20 of the molding cavity a corresponds to the molded auxiliary materials. Even if resin overflows into the ejection hole 21 during the molding process, forming a protrusion after molding, the protrusion will be formed on the lower side of the auxiliary material due to the positional relationship between the ejection hole 21 and the molding cavity a.

[0063] Specifically, the upper mold base 1 and the lower mold base 2 are closed. After a certain temperature condition and a certain closing time, the upper mold base 1 and the lower mold base 2 are separated. At this time, the molded part is attached to the lower mold base 2, and the control push rod 31 is pushed out to drive the molded part to separate from the lower mold base 2. At this time, the molded part can be taken out manually or by a robot.

[0064] Step S20, controlling the punching equipment to operate at preset parameters to separate the plurality of main bodies and auxiliary materials;

[0065] It should be noted that the preset parameters include at least the punching speed. The punching speed of the punching equipment should meet the high-speed punching conditions to avoid adhesion between the auxiliary material and the main body or uneven cutting. The punching speed needs to be reasonably set according to the material properties to avoid material tearing during the punching process.

[0066] The molded parts are taken out. At this time, multiple main bodies and auxiliary materials are connected as one. They are placed on the punching equipment according to the preset positioning requirements. By reasonably designing the matching gap between the punch and die and the punching speed of the equipment, the auxiliary materials and multiple main bodies can be separated synchronously through a single punching, which is more convenient.

[0067] Step S30: removing the cut bodies to complete the processing.

[0068] It should be noted that after the punching is completed, multiple auxiliary materials fall off and can be disposed of as waste, and multiple main bodies remain on the punching equipment, which can be taken out manually or by a robot, thereby completing the process.

[0069] Applying the punching equipment commonly used for stamping metal materials to the punching of molded parts can achieve the peeling of auxiliary materials and multiple main bodies through a single punching, simplifying the process and shortening the time.

[0070] The technical solution of this invention, based on the design of the mold structure, solves the frequent jamming during the ejection of ultra-thin thermoplastic fiber composite materials, improves the compression molding process, and realizes the automation of the entire production process. The application of blanking equipment to the molded part cutting process shortens the cutting process time, simplifies the cutting method, and improves production results.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A thermoplastic composite material forming mold, characterized in that: The thermoplastic composite material forming mold comprises: an upper die base fixed to a top plate of the molding machine, wherein the upper die base is formed with a first cavity open to a lower side; A lower die base is fixed to the bottom plate of the molding machine, the lower die base is formed with a second cavity open to the upper side, the lower die base and the upper die base can be attached to each other under the drive of the molding machine, so that the second cavity and the first cavity are jointly enclosed to form a molding cavity, the molding cavity has a main material area and an auxiliary material area arranged outside the main material area, the lower end surface of the lower die base is provided with an ejection hole connected to the second cavity, and the ejection hole is arranged corresponding to the auxiliary material area; and An ejection structure, comprising an ejector rod, the ejector rod being movably mounted in the ejection hole in an up-down direction, the ejector rod having a first position and a second position. In the first position, at least a portion of the ejector rod is located in the ejection hole, and a first clearance gap is formed between an upper end surface of the ejector rod and a bottom wall of the second cavity. In the second position, the ejector rod protrudes upward from the ejection hole. The first avoidance gap is h1, wherein 3mm≤h1≤5mm; Based on the setting of the first avoidance gap, the resin overflowing from the molding cavity will not come into contact with the ejector pin; There are multiple main material areas arranged in the horizontal direction, and the auxiliary material area is arranged around the periphery of each main material area. There are multiple ejection holes, and at least some of the ejection holes are located between two adjacent main material areas. There are correspondingly multiple ejector rods.

2. The thermoplastic composite material forming mold according to claim 1, characterized in that: A second avoidance gap is defined between the peripheral side surface of the ejector pin and the hole wall of the ejection hole. The second avoidance gap is a single-sided gap with a size of L1, wherein 0.1 mm < L1 ≤ 0.25 mm.

3. The thermoplastic composite material forming mold according to claim 1, characterized in that: The ejection structure also includes a fixed plate, which is arranged at the lower end of the lower mold base. A guide hole is provided on the fixed plate corresponding to the ejection hole. The lower end of the ejector rod is movably inserted into the guide hole, and the upper end of the ejector rod is movably inserted into the ejection hole. A second avoidance gap is defined between the peripheral side surface of the ejector rod and the hole wall of the ejection hole, and a guide gap is defined between the peripheral side surface of the ejector rod and the guide hole. The second avoidance gap and the guide gap are unilateral gaps, and the guide gap is smaller than the second avoidance gap.

4. The thermoplastic composite material forming mold according to claim 3, characterized in that: The length of the ejector rod is H. When in the first position, the length of the portion of the ejector rod located in the ejection hole is H1, wherein H1 / H≤1 / 4.

5. The thermoplastic composite material forming mold according to claim 4, characterized in that: The guide gap is L2, L2≤0.1mm.

6. The thermoplastic composite material forming mold according to claim 1, wherein: In the second position, the length of the portion of the ejector rod protruding from the ejection hole is h2, where h2 is ≥ 3 mm.

7. The thermoplastic composite material forming mold according to claim 1, wherein: There are multiple ejection holes, and the multiple ejection holes form at least three ejection groups, one of the ejection groups corresponds to the middle of the second cavity, and the other two ejection groups correspond to opposite sides of the second cavity respectively; The number of ejection holes in the ejection group located in the middle is smaller than the number of ejection holes in the ejection group located at the side.

8. A method for processing a thermoplastic product, characterized in that: Based on a thermoplastic product processing production line, the thermoplastic product processing production line includes a molding machine and a punching device, the molding machine is provided with the thermoplastic composite material forming mold according to any one of claims 1 to 7, the thermoplastic composite material forming mold has a plurality of main material areas arranged in a horizontal direction, the auxiliary material area is arranged around the outside of the plurality of main material areas, and the ejection holes and the ejector pins are provided in a one-to-one correspondence. The processing method of the thermoplastic product comprises the following steps: A molded part is obtained by processing a thermoplastic composite material molding die, wherein the molded part includes a plurality of integrally formed main bodies and an auxiliary material covering the outer sides of the plurality of main bodies, wherein the main body is formed in a main material region of the molding cavity, and the auxiliary material is formed in an auxiliary material region of the molding cavity; Controlling the punching device to operate according to preset parameters to separate the plurality of main bodies from the auxiliary materials; The plurality of cut bodies are taken away to complete the processing.

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