Thermoplastic composite material forming mold and processing method of thermoplastic product

Abstract

The invention discloses a thermoplastic composite material forming mold and a processing method of a thermoplastic product, and relates to the technical field of thermoplastic molding.In the thermoplastic composite material forming mold, a lower mold base and an upper mold base can be driven by a molding press to be attached to each other, so that a second cavity of the lower mold base and a first cavity of the upper mold base jointly define a mold pressing cavity; the mold pressing cavity is provided with a main material area and an auxiliary material area arranged on the periphery of the main material area, an ejection hole communicated with the second mold cavity is formed in the lower end face of the lower mold base, and the ejection hole corresponds to the auxiliary material area; the ejector rod is movably installed in the ejection hole in the vertical direction and has a first position and a second position, at least part of the ejector rod is located in the ejection hole when the ejector rod is located at the first position, a first clearance is formed between the upper end face of the ejector rod and the bottom wall of the second cavity, and the ejector rod protrudes out of the ejection hole upwards when the ejector rod is located at the second position. A stress release point is formed at the position of the ejection hole, and the first clearance avoids clamping stagnation caused by contact between the overflowing glue and the ejection rod, so that the product yield is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoplastic molding, and particularly relates to a thermoplastic composite molding die and a processing method for thermoplastic products. Background Art

[0002] Conventional removal solutions for thermoplastic composites after compression molding include: pneumatic-assisted removal and removal by a conventional ejection mechanism (ejector pins, ejector rods, etc.). In pneumatic-assisted removal, it is generally difficult to control the blowing to make the product evenly stressed, the demolding is unstable, manual operation is required for removal, the labor cost is relatively high, and the molding cycle is prolonged, which is not conducive to efficient mass production. For some ultra-thin products, the ejection mechanism is extremely likely to cause deformation of the product during the ejection process, increasing the risk of ejection imbalance. Summary of the Invention

[0003] The main object of the present invention is to propose a thermoplastic composite molding die 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, non-closed cavities are used for processing, so that the ejection holes can conduct the cavities, and thus glue overflow will occur under the action of pressure during the compression molding process.

[0004] However, during the compression molding process, the composite material is extremely likely to enter the ejector pin gap under a relatively high molding pressure, increasing the risk of jamming of the ejection mechanism and making it impossible to stably and continuously produce in batches. Therefore, by reasonably setting the clearance between the ejector rod and the cavity, the ejector pin jamming can be avoided.

[0005] To achieve the above object, the present invention proposes a thermoplastic composite molding die, comprising: A thermoplastic composite molding die, characterized in that the thermoplastic composite molding die comprises: An upper die base for being fixed to the top plate of a molding press, and the upper die base forms a first cavity with an open lower side; A lower die base for being fixed to the bottom plate of the molding press, the lower die base forms a second cavity with an open upper side, the lower die base and the upper die base can be brought into mutual contact under the drive of the molding press so that the second cavity and the first cavity jointly enclose a molding cavity, the molding cavity has a main material area and an auxiliary material area arranged outside the main material area, and an ejection hole communicating with the second cavity is opened on the lower end surface of the lower die base, and the ejection hole is arranged corresponding to the auxiliary material area; An ejection structure, including an ejector rod, the ejector rod is movably installed in the ejection hole in the vertical direction, the ejector rod has a first position and a second position, in the first position, at least part of the ejector rod is in the ejection hole, and a first clearance gap is formed between the upper end surface of the ejector rod and the bottom wall of the second cavity, and in the second position, the ejector rod protrudes upward from the ejection hole.

[0006] In one embodiment, the first avoidance space gap is h1, where 3 mm ≤ h1 ≤ 5 mm.

[0007] In one embodiment, a second avoidance space gap is defined between the circumferential side surface of the ejector rod and the hole wall of the ejection hole. The second avoidance space gap is L1, where 0.1 mm < L1 ≤ 0.25 mm.

[0008] In one embodiment, the ejection structure further includes a fixing plate. The fixing plate is disposed at the lower end of the lower die base. A guiding hole is provided on the fixing plate corresponding to the ejection hole. The lower end of the ejector rod is movably inserted through the guiding hole, and the upper end of the ejector rod is movably inserted through the ejection hole. A second avoidance space gap is defined between the circumferential side surface of the ejector rod and the hole wall of the ejection hole, and a guiding gap is defined between the circumferential side surface of the ejector rod and the guiding hole. The guiding gap is smaller than the second avoidance space gap.

[0009] In one embodiment, the length of the ejector rod is H. When in the first position, the length of the part of the ejector rod inside the ejection hole is H1, where H1 / H ≤ 1 / 4.

[0010] In one embodiment, the guiding gap is L2, and L2 ≤ 0.1 mm.

[0011] In one embodiment, when in the second position, the length of the part of the ejector rod protruding out of the ejection hole is h2, where h2 ≥ 3 mm.

[0012] In one embodiment, a plurality of main material regions are arranged horizontally, and the auxiliary material region is annularly arranged outside the plurality of main material regions; A plurality of ejection holes are provided, and at least part of the ejection holes are located between two adjacent main material regions; A plurality of ejector rods are correspondingly provided.

[0013] In one embodiment, a plurality of ejection holes are provided. The plurality of ejection holes form at least three ejection groups. One of the ejection groups corresponds to the middle part of the second cavity, and the other two ejection groups correspond to the opposite sides of the second cavity; The number of ejection holes in the ejection group located in the middle is less than the number of ejection holes in the ejection groups located on the sides; A plurality of ejector rods are correspondingly provided.

[0014] The present invention also provides a processing method for a thermoplastic product. Based on a thermoplastic product processing production line, the thermoplastic product processing production line includes a molding press and a blanking device. A thermoplastic composite material forming mold is provided on the molding press. The thermoplastic composite material forming mold includes an upper die base, a lower die base, and an ejection structure. The upper die base is used to be fixed to the top plate of the molding press, and the upper die base forms a first cavity with an open lower side; the lower die base is used to be fixed to the bottom plate of the molding press, the lower die base forms a second cavity with an open upper side, and the lower die base and the upper die base can be brought into mutual fit under the drive of the molding press so that the second cavity and the first cavity jointly enclose a molding cavity. The molding cavity has a main material area and an auxiliary material area provided on the periphery of the main material area. A top ejection hole communicating with the second cavity is opened on the lower end surface of the lower die base, and the top ejection hole is arranged corresponding to the auxiliary material area; the ejection structure includes a ejector rod, and the ejector rod is movably installed in the top ejection hole in the vertical direction. The ejector rod has a first position and a second position. In the first position, at least part of the ejector rod is in the top ejection hole, and a first clearance space 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 top ejection hole. A plurality of main material areas in the thermoplastic composite material forming mold are arranged in the horizontal direction, and the auxiliary material area is annularly arranged outside the plurality of main material areas. A plurality of top ejection holes and the ejector rods are arranged in one-to-one correspondence; The processing method for the thermoplastic product includes the following steps: A molded part is obtained through the thermoplastic composite material forming mold. The molded part includes a plurality of main bodies integrally formed and an auxiliary material coated on the outside of the plurality of main bodies. Among them, the main material area of the molding cavity corresponds to the formation of the main bodies, and the auxiliary material area of the molding cavity corresponds to the formation of the auxiliary material; Control the blanking device to work with preset parameters to separate the plurality of main bodies and the auxiliary material; Take away the plurality of main bodies obtained by cutting to complete the processing.

[0015] In the technical solution of the present invention, when the upper die base and the lower die base are combined and matched, a molding cavity is formed. In the molding cavity, the main material area is used to correspondingly form the main body of the product, and the auxiliary material area correspondingly wraps around the periphery of the main material area, so as to correspondingly form on the outside of the main body of the product. As the auxiliary material, it needs to be removed in the subsequent process. Since the top ejection hole is in the auxiliary material area, during the molding process, part of the resin will overflow and flow into the top ejection hole. Based on the setting of the first clearance space, the overflowing resin will not contact the ejector rod. After molding, the ejector rod pushes upward against the overflowing glue and then drives the entire product to separate from the lower die base. The position of the top ejection hole forms a stress release point, which can weaken the connection force between the product and the lower die base. The first clearance space can also prevent the overflowing glue from contacting the ejector rod and causing jamming. When ejecting, the ejector rod corresponds to the position of the auxiliary material and will not affect the main body of the product. Therefore, the stability of ejection and the product yield can be improved. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic structural diagram of an embodiment (in the closed mold state) of the thermoplastic composite material forming mold provided by the present invention; Figure 2 is Figure 1 a schematic structural diagram of the thermoplastic composite material forming mold (in the open mold state) in; Figure 3 is Figure 2 a top view schematic diagram of the lower mold base in; Figure 4 It is a schematic flowchart of the processing method of the thermoplastic product provided by the present invention.

[0018] Explanation of the reference numerals in the drawings: 1. Upper mold base; 2. Lower mold base; 21. Ejection hole; 21a. First ejection hole; 21b. Second ejection hole; 3. Ejection structure; 31. Ejector rod; 32. Fixed plate; 321. Guide hole; 10. Main material area; 20. Auxiliary material area; a. Molding cavity.

[0019] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] 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 used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to 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.

[0023] Conventional removal solutions for thermoplastic composite materials after compression molding include: pneumatic assisted removal and conventional ejector mechanism removal (ejector pins, ejector rods, etc.). Pneumatic assisted removal generally has difficulty in controlling the air blowing to make the product evenly stressed, and demolding is unstable, so manual removal is required. The labor cost is high, and the molding cycle is prolonged, which is not conducive to efficient mass production. For some ultra-thin products, such as products with a wall thickness of less than 0.3mm, the use of an ejector mechanism can easily cause product deformation during the ejection process, increasing the risk of ejection imbalance.

[0024] In order to alleviate the deformation of ultra-thin products caused by the ejection mechanism during the ejection process, the present invention uses a non-enclosed cavity for processing so that the ejection hole can be connected to the cavity. However, during the molding process, the composite material is very likely to enter the ejector pin gap under a high molding pressure, increasing the risk of the ejection mechanism getting stuck and making it impossible to achieve stable and continuous mass production. Therefore, the present invention also avoids ejector pin jamming by reasonably setting the ejector pin and cavity clearance.

[0025] Please refer to Figures 1 to 2 The thermoplastic composite material forming mold comprises an upper mold base 1, a lower mold base 2 and an ejection structure 3, wherein the upper mold base 1 is used to be fixed to the top plate of the molding machine, and a first cavity with an open lower side 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, and a second cavity with an open upper side is formed on the lower mold base 2, and the lower mold base 2 and the upper mold base 1 can be attached to each other 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, and the molding cavity a has a main material area 10 and an auxiliary cavity arranged outside the main material area 10. 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 an 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.

[0026] In the technical solution of the present invention, when the upper die base 1 and the lower die base 2 are combined and matched, a molding cavity a is formed. 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 coated around the main material area 10, so as to be correspondingly molded on the outside of the main body of the product. As an auxiliary material, it needs to be removed in the subsequent 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 clearance, the overflowing resin will not contact the ejector rod 31. After molding, the ejector rod 31 pushes upward against the overflow glue and then drives the entire product to separate from the lower die 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 die base 2. The first avoidance clearance can also prevent the overflow glue from contacting the ejector rod 31 and causing jamming. When ejecting, the ejector rod 31 corresponds to the position of the auxiliary material and will not affect the main body of the product, so the stability of ejection and the product yield can be improved.

[0027] During the thermoplastic process, the mold structure generally circulates 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, although the resin will flow in the molding cavity a, the flow rate is slow. Therefore, although the molding cavity a is in a non-sealed state due to the connection state of the ejection hole 21 and the first avoidance clearance, the volume of the resin overflowing into the first avoidance clearance is limited. Therefore, by reasonably setting the size of the first avoidance clearance through testing and simulation analysis, the contact between the ejector rod 31 and the overflow glue can be avoided. In this embodiment, the first avoidance clearance is h1, where 3mm ≤ h1 ≤ 5mm. h1 can be set to 3mm, 4mm, 4.5mm, 5mm. This size design can prevent the overflow glue at the upper end of the ejection hole 21 from contacting the ejector rod 31 and causing the ejector rod 31 to jam after thermosetting, and at the same time, it will not affect the reciprocating movement of the ejector rod 31 up and down.

[0028] Since the mold is in a high-temperature environment for a long time during use, and the mold may undergo thermal expansion in a high-temperature environment, that is, the wall surface of the ejection hole 21 will expand and squeeze, resulting in a local reduction in the aperture of the ejection hole 21. This mold expansion change will increase the risk of the ejector rod 31 jamming and cause the ejector rod 31 to be unable to eject smoothly. Therefore, in some embodiments, a second avoidance clearance is defined between the circumferential side surface of the ejector rod 31 and the hole wall of the ejection hole 21. The second avoidance clearance is L1, where 0.1mm < L1 ≤ 0.25mm. The second avoidance clearance is the unilateral clearance between the ejector rod 31 and the ejection hole 21. By reasonably restricting the size of the second avoidance clearance, the expansion space of the lower die base 2 is reserved, so that the movement of the ejector rod 31 will not be interfered with in the case of the expansion change of the hole wall of the ejection hole 21. L1 can be 0.15mm, 0.22mm, 0.25mm.

[0029] Further, the ejection structure 3 further includes a fixing plate 32, which is provided at the lower end of the lower die 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 through the guide hole 321, and the upper end of the ejector rod 31 is movably inserted through the ejection hole 21. The lower end of the ejector rod 31 is connected to the fixing plate 32 through a corresponding connection structure. The ejector rod 31 can reciprocate up and down under the action of the driving structure. The fixing plate 32 can avoid the situation of high-temperature expansion of the fixing plate 32 by material setting or adding a heat insulation plate between the fixing plate 32 and the lower die base 2. Therefore, the gap between the guide hole 321 and the ejector rod 31 needs to be accurately set to ensure the straight guiding accuracy of the ejector rod 31 and avoid the deviation and shaking of the ejector rod 31 during the ejection process.

[0030] Specifically, a second avoidance clearance is defined between the circumferential side surface of the ejector rod 31 and the hole wall of the ejection hole 21, and a guiding clearance is defined between the circumferential side surface of the ejector rod 31 and the guide hole 321. The guiding clearance is smaller than the second avoidance clearance. The second avoidance clearance is to avoid the influence caused by the thermal expansion of the lower die base 2, so the second avoidance clearance is set to be larger than the guiding clearance. Such a setting can not only meet the guiding fit but also adapt to the thermal expansion deformation of the mold.

[0031] It should be noted that the above-mentioned guiding clearance refers to the unilateral clearance, and the guiding clearance is L2, where L2 ≤ 0.1 mm, so as to meet the requirements of the fitting accuracy.

[0032] The guiding effect of the ejector rod 31 during the movement is not only affected by the size of the guide hole 321 but also affected by the fitting length between the ejector rod 31 and the guide hole 321. If the part of the ejector rod 31 inside the ejection hole 21 is relatively large, the uncontrolled section of the ejector rod 31 during the upward ejection process is longer, and there is also a greater risk of shaking at the upper end. Therefore, in some embodiments, the total length of the ejector rod 31 is H. When in the first position, the length of the part of the ejector rod 31 inside the ejection hole 21 is H1, where H1 / H ≤ 1 / 4. By reasonably setting the ratio of the size of the part of the ejector rod 31 inside the ejection hole 21 to the total length of the ejector rod 31, the fitting effect between the guide hole 321 and the ejector rod 31 is improved, and the ejection accuracy is improved.

[0033] When the mold is closed for processing, the ejector rod 31 is in the first position. After the processing is completed, the upper mold base 1 moves upward first. At this time, the formed product remains on the lower mold base 2, and the ejector rod 31 is driven to move upward. Therefore, the moving stroke of the ejector rod 31 needs to be greater than the size of the first avoidance space gap, so as to ensure that the product can be lifted to be separated from the lower mold base 2. In this embodiment, when in the second position, the length of the part of the ejector rod 31 protruding from the ejection hole 21 is h2, where h2≥3mm. By restricting the protruding height of the ejector rod 31 in the second position, the upward movement stroke of the ejector rod 31 is indirectly limited, so as to ensure that the ejection force applied by the ejector rod 31 to the product is consistent, and at the same time, it can also ensure that the product is completely separated from the mold surface.

[0034] It should be noted that the ejector rod 31 and the ejection hole 21 form a matching group one by one. Multiple matching groups can be set. The arrangement form 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 in a straight line, and multiple matching groups can also be arranged in an array. The present invention does not limit this.

[0035] The main material area 10 of the molding cavity a corresponds to the main body of the formed product, and the auxiliary material area 20 of the molding cavity a corresponds to the formed auxiliary material. Please refer to Figure 3 , a plurality of main material areas 10 are arranged horizontally, and the auxiliary material areas 20 are arranged around the outside of the plurality of main material areas 10. In this way, multiple main bodies can be obtained by single - time thermoplastic molding, improving the processing efficiency. It should be understood that an auxiliary material area 20 is arranged around the periphery of each main material area 10. Correspondingly, a plurality of ejection holes 21 are provided, and at least part of the ejection holes 21 are located between two adjacent main material areas 10, and a plurality of ejector rods 31 are correspondingly arranged. This arrangement form is beneficial for the ejector rod 31 to drive two adjacent main bodies to be separated from the lower mold base 2 when ejecting, so as to ensure the ejection effect.

[0036] It should be understood that the plurality of main material areas 10 can be arranged in a straight line, or arranged in multiple columns, or arranged in a staggered manner. The present invention does not limit this.

[0037] The location and number of the ejector 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 ejector holes 21, and the multiple ejector holes 21 form at least three ejector groups, one of which corresponds to the middle of the second cavity, and the other two ejector groups correspond to the opposite sides of the second cavity. At this time, the three ejector groups are arranged in a straight line, and the number of ejector holes 21 in the ejector group located in the middle is less than the number of ejector holes 21 in the ejector group located on the side, and multiple ejector rods 31 are arranged corresponding to the ejector holes 21. Since the number of ejector holes 21 in the middle ejector group and the ejector group on the side is different, they should be arranged in a staggered manner, so that the ejector holes 21 in the middle ejector group and the ejector holes 21 in the side ejector group 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 a stable ejection force when the product is ejected.

[0038] Please refer to Figures 1 to 2 , in an embodiment of the present invention, 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; During the mold molding, 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.

[0039] The mold is opened, and the product remains on the mold surface on the side of the ejector pin 31 of the lower mold base 2. The ejector pin 31 is lifted. Since the stroke 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 overflowing into the ejection hole 21. As the ejector pin 31 continues to eject, the product is driven off the mold surface. At this time, the product can be removed smoothly with the help of automated equipment, and the ejector pin 31 is reset. After the upper mold base 1 and the lower mold base 2 are closed, the next molding process is carried out.

[0040] The main object of the present invention is to provide an ejection solution for the forming of ultra-thin thermoplastic fiber composites. Based on the conventional ejection mechanism, according to the forming characteristics of thermoplastic fiber composites, the design of the ejection structure 3 is optimized. Through the clearance design in the up and down directions and the radial direction of the ejector rod 31, it is possible to avoid resin overflow from contacting the ejector rod 31 and causing jamming of the ejector rod 31, and also avoid the mold expansion and deformation from squeezing the ejector rod 31 and causing jamming of the ejector rod 31. This structure can achieve stable ejection after the molding of ultra-thin thermoplastic fiber composites, avoiding problems such as frequent jamming, low operation rate, and high labor input of traditional ejection mechanisms, enabling the entire forming process to reach an automated steady-state production, reducing labor input, improving production operation rate, and reducing production input and costs.

[0041] An embodiment of the present application provides a processing method for thermoplastic products. Figure 4 It is a schematic flowchart of an embodiment of the processing method for thermoplastic products of the present application.

[0042] The processing method for thermoplastic products includes the following steps: Step S10, obtaining a molded part through a thermoplastic composite molding die. It should be noted that the molded part includes a plurality of integrally formed main bodies and auxiliary materials coated on the outside of the plurality of main bodies. In the corresponding mold structure, the main material area 10 of the molding cavity a corresponds to the forming of the main body, and the auxiliary material area 20 of the molding cavity a corresponds to the forming of the auxiliary material. Even if resin overflows during the molding process and enters the ejection hole 21, forming a convex part after molding, based on the positional relationship between the ejection hole 21 and the molding cavity a, the convex part is also correspondingly formed on the lower side of the auxiliary material.

[0043] Specifically, the upper mold base 1 and the lower mold base 2 are closed. After a certain temperature condition and a certain mold closing time, the upper mold base 1 and the lower mold base 2 are separated. At this time, the molded part adheres to the lower mold base 2. Control the ejector rod 31 to eject to drive the molded part to separate from the lower mold base 2. At this time, the molded part can be taken by manual or manipulator.

[0044] Step S20, controlling the blanking equipment to work with preset parameters to separate the plurality of main bodies and the auxiliary materials. It should be noted that the preset parameters at least include the blanking speed. The blanking speed of the blanking equipment should meet the high-speed blanking condition, so as to avoid adhesion or uneven cutting seams between the auxiliary materials and the main bodies. The blanking speed needs to be reasonably set according to the material characteristics to avoid material tearing during the blanking process.

[0045] Take out the molded part. At this time, the plurality of main bodies and the auxiliary materials are connected as a whole. According to the preset positioning requirements, place them on the blanking equipment. By reasonably designing the clearance between the blanking punch and the die and the blanking speed of the equipment, the synchronous separation of the auxiliary materials and the plurality of main bodies can be completed through a single blanking, which is more convenient.

[0046] Step S30: Take away the multiple main bodies obtained by cutting to complete the processing.

[0047] It should be noted that after blanking, multiple auxiliary materials fall off and can be discharged as waste. Multiple main bodies remain on the blanking equipment, and the multiple main bodies can be taken out manually or by a manipulator, thus completing the process.

[0048] Applying the blanking equipment usually used for stamping of metal materials to the blanking of molded parts can achieve the separation of auxiliary materials and multiple main bodies through a single blanking, simplify the process, and take less time.

[0049] In the technical solution of the present invention, based on the design of the mold structure, the frequent jamming of the ultra-thin thermoplastic fiber composite material during the ejection process is solved, the compression molding process is improved, and the automated production of the entire production process is realized. Applying the blanking equipment to the blanking process of molded parts shortens the blanking process duration, simplifies the blanking method, and improves the production effect.

[0050] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is 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 die includes: an upper die base for being fixed to the top plate of a molding press, and the upper die base is formed with a first cavity having an open lower side; a lower die base for being fixed to the bottom plate of the molding press, the lower die base is formed with a second cavity having an open upper side, the lower die base and the upper die base can be brought into mutual contact under the drive of the molding press so that the second cavity and the first cavity jointly enclose a molding cavity, the molding cavity has a main material area and an auxiliary material area provided on the periphery of the main material area, and an ejection hole communicating with the second cavity is formed in the lower end surface of the lower die base, and the ejection hole is arranged corresponding to the auxiliary material area; and, an ejection structure including an ejector rod, the ejector rod is movably installed in the ejection hole in the up-and-down direction, the ejector rod has a first position and a second position, in the first position, at least a part of the ejector rod is in the ejection hole, and a first avoidance space 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.

2. The thermoplastic composite material forming die according to claim 1, characterized in that, The first avoidance space gap is h1, where 3mm ≤ h1 ≤ 5mm.

3. The thermoplastic composite material forming mold according to claim 1, wherein A second avoidance space gap is defined between the circumferential side surface of the ejector rod and the hole wall of the ejection hole, the second avoidance space gap is L1, where 0.1mm < L1 ≤ 0.25mm.

4. The thermoplastic composite material forming mold according to claim 1, characterized in that, The ejection structure further includes a fixing plate, the fixing plate is arranged at the lower end of the lower die base, a guiding hole is arranged on the fixing plate corresponding to the ejection hole, the lower end of the ejector rod movably passes through the guiding hole, the upper end of the ejector rod movably passes through the ejection hole, a second avoidance space gap is defined between the circumferential side surface of the ejector rod and the hole wall of the ejection hole, and a guiding gap is defined between the circumferential side surface of the ejector rod and the guiding hole, and the guiding gap is smaller than the second avoidance space gap.

5. The thermoplastic composite material forming die according to claim 4, characterized in that, The length of the ejector rod is H, in the first position, the length of the part of the ejector rod in the ejection hole is H1, where H1 / H ≤ 1 / 4.

6. The thermoplastic composite material forming die according to claim 4, wherein The guiding gap is L2, L2 ≤ 0.1mm.

7. The thermoplastic composite material forming die according to claim 1, characterized in that, In the second position, the length of the part of the ejector rod protruding from the ejection hole is h2, where h2 ≥ 3mm.

8. The thermoplastic composite material forming mold according to claim 1, characterized in that, A plurality of the main material areas are arranged horizontally, and the auxiliary material area is annularly arranged outside the plurality of main material areas; A plurality of the ejection holes are provided, and at least part of the ejection holes are between two adjacent main material areas; A plurality of the ejector rods are correspondingly arranged.

9. The thermoplastic composite material forming mold according to claim 1, characterized in that, A plurality of the ejection holes are provided, and the plurality of ejection holes form at least three ejection groups, one of the ejection groups corresponds to the middle part of the second cavity, and the other two ejection groups correspond to the opposite sides of the second cavity; The number of the ejection holes in the ejection group located in the middle is less than the number of the ejection holes in the ejection group located on the side; A plurality of the ejector rods are correspondingly arranged.

10. A processing method for a thermoplastic product, characterized in that, Based on a thermoplastic product processing production line, the thermoplastic product processing production line includes a molding press and a blanking device. The molding press is provided with a thermoplastic composite material forming mold as described in any one of claims 1 to 9. A plurality of main material areas in the thermoplastic composite material forming mold are arranged in the horizontal direction, and an auxiliary material area is arranged around the outside of the plurality of main material areas. A plurality of ejection holes and ejector rods are arranged in one-to-one correspondence; The processing method of the thermoplastic product includes the following steps: Obtaining a molded part through a thermoplastic composite material forming mold. The molded part includes a plurality of integrally formed main bodies and auxiliary materials coated on the outside of the plurality of main bodies. Among them, the main material area of the molding cavity corresponds to the formation of the main bodies, and the auxiliary material area of the molding cavity corresponds to the formation of the auxiliary materials; Controlling the blanking device to work with preset parameters to separate the plurality of main bodies and the auxiliary materials; Taking away the plurality of main bodies obtained by cutting to complete the processing.

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