Re-pressing method and device of PBT composite material for automobile exterior decoration

Abstract

The invention provides a re-pressing method and device of a PBT composite material for automobile exterior trimming, and belongs to the technical field of automobile exterior trimming. The re-pressing method of the PBT composite material for the automobile exterior decoration comprises the following steps: material preheating: preheating the PBT composite material; coating the material with a release agent: coating the surface of the preheated PBT composite material with the release agent; re-pressing and molding the material: putting the PBT composite material coated with the release agent into a mold, and re-pressing and molding the PBT composite material; and cooling and demolding: after the re-pressing of the PBT composite material is completed, cooling the PBT composite material in the mold, and carrying out demolding operation. According to the equipment, the re-pressing procedure of the PBT composite material is optimized, the quality of the automobile exterior decoration is guaranteed, the efficiency of re-pressing the PBT composite material into the automobile exterior decoration can be effectively improved, and the overall using effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of automobile exterior decoration, and in particular to a re-pressing method and device of a PBT composite material for automobile exterior decoration. Background Art

[0002] PBT material is an engineering material with excellent performance, excellent toughness and fatigue resistance, heat resistance, good weather resistance, good electrical properties, and low water absorption. In the field of automobile manufacturing, PBT material is widely used in automobile interior and exterior parts, such as mirrors, door handles, lamp frames, bumpers, etc.

[0003] However, in the prior art, the re-pressing process steps of PBT materials are relatively complicated and not continuous, which affects the efficiency of the re-pressing process. Therefore, the present application provides a re-pressing method and device for PBT composite materials for automotive exteriors to solve the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a re-pressing method and device for PBT composite materials for automobile exterior decoration to solve the problem in the prior art that the re-pressing process of PBT materials is relatively complicated and not continuous enough, which affects the efficiency of the re-pressing process.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for re-pressing a PBT composite material for automobile exterior, comprising the following steps:

[0007] S1. Material preheating: preheating the PBT composite material;

[0008] S2. Material coating release agent: Apply release agent on the surface of the preheated PBT composite material;

[0009] S3, material re-pressing and molding: putting the PBT composite material coated with a release agent into a mold and re-pressing it;

[0010] S4, cooling and demoulding: After the PBT composite material is re-pressed, it is cooled in the mold and demoulding is performed.

[0011] Optionally, when preheating the PBT composite material, the preheating temperature is controlled to be 180-220° C., and the preheating time is 10-20 minutes.

[0012] Optionally, the release agent includes a silicone oil release agent, and the coating thickness is 0.1-0.3 mm.

[0013] Optionally, when the PBT composite material coated with the release agent is subjected to re-pressing molding, the re-pressing pressure is controlled to be 10-15 MPa, and the re-pressing time is controlled to be 5-10 minutes.

[0014] A re-pressing device for PBT composite materials for automobile exteriors, applicable to the re-pressing method for PBT composite materials for automobile exteriors, comprising a substrate, a lower die seat being fixed at one end of the upper end surface of the substrate, and a support frame being fixed at the other end;

[0015] An upper die seat is provided above the lower die seat, a plurality of cooling channels surrounding the lower die are arranged in the lower die seat, a preheating box is fixed on the top of the support frame, a material guide plate is provided at the material outlet of the preheating box, the material guide plate is tilted downward and butted against the upper edge of the lower die seat;

[0016] A mounting frame is provided on the material guide plate, and an atomizing nozzle for spraying a release agent is installed on the lower end surface of the mounting frame. A reflux channel for recovering the release agent is provided in the bottom of the material guide plate, and the lower end of the reflux channel is connected to the cooling channel, and the outlet of the cooling channel is connected to a heat dissipation groove, and a pump body is matched on the heat dissipation groove, and the pump body conveys the release agent to the atomizing nozzle.

[0017] Optionally, a fixing frame is fixed to one side of the lower die base, a cylinder is installed on the top of the fixing frame, the cylinder is located directly above the lower die base, and the axis of the cylinder is vertically downward and fixed to the upper die base.

[0018] Optionally, a box door is provided on one side of the preheating box facing the upper end of the material guide plate, and an electric push rod is fixed to the outside of the preheating box away from the box door. The shaft of the electric push rod extends horizontally into the preheating box and is fixed with a push plate.

[0019] Optionally, a liquid seepage mesh hole is provided in the middle of the guide plate corresponding to the position of the mounting frame, and the liquid seepage mesh hole is connected to the top of the reflux channel.

[0020] Optionally, the cooling channel is a spring-shaped spiral channel structure surrounding the inner cavity of the lower mold base, and a docking port is opened on the top of the cooling channel, and the docking port is docked with the lower port of the reflux channel. The bottom of the cooling channel is connected to a plurality of liquid outlet pipes, and the liquid outlet pipes are connected to the heat dissipation groove.

[0021] Optionally, a plurality of heat conducting plates are fixed on the inner wall of the groove body for fixing the lower mold in the lower mold base, a plurality of heat dissipating fins are fixed on the heat conducting plates, and the heat dissipating fins extend into the cooling channel.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In the above scheme, the re-pressing method of the PBT composite material for automobile exterior decoration has simple steps. Through the preheating step, the molecular chain of the PBT composite material is activated, which is beneficial to the subsequent re-pressing process and can improve the re-pressing effect.

[0024] By coating the surface of the PBT composite material with a silicone release agent, the adhesion of the PBT composite material to the mold can be effectively prevented, the product quality is improved, and the demoulding efficiency after the automobile exterior is re-pressed and molded is facilitated;

[0025] By controlling the reasonable re-pressing pressure and time range, the shape and size accuracy of the product are guaranteed and the production efficiency is improved;

[0026] By setting appropriate cooling temperature and time, deformation of the product after demoulding is avoided and product quality is guaranteed.

[0027] In the above scheme, the re-pressing device of the PBT composite material for automobile exterior can be adapted to the re-pressing method of the PBT composite material for automobile exterior, and while achieving the above beneficial effects, by arranging an electric push rod and a push plate in the preheating box, it is convenient to push the preheated PBT composite material into the material guide plate to avoid scalding the staff;

[0028] By arranging a mounting frame, an atomizing nozzle, and a liquid permeable mesh on the guide plate, the release agent can be coated on the outer surface of the PBT composite material in the guide plate by spraying, so that when it falls into the lower die base, the release agent is automatically applied;

[0029] By setting a cooling channel in the lower die base and coordinating the seepage mesh and the reflux channel to recover the release agent, the recovered release agent can flow through the guidance of the cooling channel, and continuously bring the heat of the lower die base into the heat dissipation groove for dissipation. When cooperating with the pump body to form a recycling process of the release agent, the release agent will further be used to take away part of the heat in the lower die base, thereby improving the speed of re-pressing and cooling molding of the PBT composite material in the lower die base to a certain extent.

[0030] In summary, the present invention not only optimizes the re-pressing process of the PBT composite material and ensures the quality of the automobile exterior, but also, through the equipment of the present invention, can effectively improve the efficiency of re-pressing the PBT composite material into automobile exterior, and the overall use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0032] Figure 1 A flowchart of the steps of the re-pressing method of PBT composite materials for automotive exteriors;

[0033] Figure 2 This is a schematic diagram of the structure of a re-pressing device for PBT composite materials for automotive exteriors;

[0034] Figure 3 It is a schematic diagram of the structure inside the preheating box;

[0035] Figure 4 Schematic diagram of the internal structure of the guide plate;

[0036] Figure 5 Schematic diagram of the internal structure of the lower die base;

[0037] Figure 6 for Figure 2 A magnified schematic diagram of the structure in the middle.

[0038] [reference numerals]

[0039] 1. Base plate; 2. Lower die base; 201. Cooling channel; 202. Docking port; 203. Liquid outlet pipe; 204. Heat conduction plate; 205. Heat dissipation fin; 3. Fixing frame; 301. Cylinder; 4. Upper die base; 5. Support frame; 6. Preheating box; 601. Box door; 602. Electric push rod; 603. Push plate; 7. Material guide plate; 701. Mounting frame; 702. Atomizing nozzle; 703. Liquid seepage mesh; 704. Reflux channel; 8. Heat dissipation slot; 801. Filter; 9. Pump body.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0041] The following is a detailed description of a PBT composite material re-pressing method and device for automobile exterior provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0042] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0043] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0044] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0045] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0046] like Figure 1 As shown, the present invention proposes a re-pressing method for a PBT composite material for automobile exterior, comprising the following steps:

[0047] S1. Material preheating: Preheat the PBT composite material. When preheating the PBT composite material, control the preheating temperature to 220°C and the preheating time to 10 minutes. Through this preheating step, the molecular chain of the PBT composite material can be activated, which is beneficial to the subsequent re-pressing process. The preheating temperature is 180-220°C and the preheating time is 10-20 minutes. The range can make the material reach a better re-pressing state without destroying the material performance.

[0048] S2, material coating release agent: apply release agent on the surface of the preheated PBT composite material. The release agent includes a silicone oil release agent, and the application thickness is 0.1 mm. The release agent is used to prevent the PBT composite material from sticking to the mold during the re-pressing process. At the same time, the silicone oil release agent has a good demoulding effect.

[0049] S3, material re-pressing molding: put the PBT composite material after applying the release agent into the mold and re-press it. Specifically, when the PBT composite material after applying the release agent is re-pressed, the re-pressing pressure is controlled to be 15MPa and the re-pressing time is 5 minutes. Among them, the re-pressing pressure of 10-15MPa and the re-pressing time of 5-10 minutes can make the PBT composite material fully formed in the mold to obtain the shape and dimensional accuracy that meet the requirements of automobile exterior decoration. Too little pressure or too short time will lead to incomplete molding, and too much pressure or too long time may damage the material or mold.

[0050] S4, cooling and demoulding: After the PBT composite material is re-pressed, it is cooled in the mold and demoulding is performed. After the re-pressing is completed, it is cooled in the mold, the cooling temperature is 30°C, and the cooling time is 25 minutes. Specifically, the cooling temperature is 30-50°C and the cooling time is 15-25 minutes, which can stabilize the shape of the PBT composite material after re-pressing and avoid deformation and other problems after demoulding. This temperature and time range can also improve production efficiency while ensuring product quality.

[0051] Therefore, in the present invention, the re-pressing method of the PBT composite material for automobile exterior decoration has simple steps. Through the preheating step, the molecular chain of the PBT composite material is activated, which is beneficial to the subsequent re-pressing process and can improve the re-pressing effect.

[0052] By coating the surface of the PBT composite material with a silicone release agent, the adhesion of the PBT composite material to the mold can be effectively prevented, the product quality is improved, and the demoulding efficiency after the automobile exterior is re-pressed and molded is facilitated;

[0053] By controlling the reasonable re-pressing pressure and time range, the shape and size accuracy of the product are guaranteed and the production efficiency is improved;

[0054] By setting appropriate cooling temperature and time, deformation of the product after demoulding is avoided and product quality is guaranteed.

[0055] like Figure 2 As shown, the present invention proposes a re-pressing device for PBT composite materials for automobile exteriors, which is suitable for the above-mentioned re-pressing method for PBT composite materials for automobile exteriors, including a substrate 1, a lower mold base 2 is fixed at one end of the upper end surface of the substrate 1, and a support frame 5 is fixed at the other end.

[0056] A fixing frame 3 is fixed to one side of the lower die base 2, a cylinder 301 is installed on the top of the fixing frame 3, the cylinder 301 is located directly above the lower die base 2, and the axis of the cylinder 301 is vertically downward, and an upper die base 4 is fixed. Therefore, the lower die base 2 can be used to fix the lower die, and the upper die base 4 can be used to fix the upper die, so as to perform a re-pressing process on the PBT composite material under a pressure of 15MPa.

[0057] Cooperate Figure 3 As shown, a preheating box 6 is fixed on the top of the support frame 5, and the preheating box 6 preheats the PBT composite material to 220°C, and a material guide plate 7 is provided at the discharge port of the preheating box 6, and the material guide plate 7 is tilted downward and docked with the upper edge of the lower die base 2. Specifically, a box door 601 is provided on the side of the preheating box 6 facing the upper end of the material guide plate 7, and an electric push rod 602 is fixed on the outside of the preheating box 6 away from the box door 601. The shaft of the electric push rod 602 extends horizontally into the preheating box 6, and a push plate 603 is fixed. Therefore, it is convenient to use the push plate 603 to push the preheated PBT composite material into the material guide plate 7 to avoid scalding the staff.

[0058] At the same time, the lower die base 2 is provided with a plurality of cooling channels 201 surrounding the lower die, and the lower die base 2 is provided with a plurality of cooling channels 201 surrounding the lower die. Figure 4 As shown, a mounting frame 701 is provided on the material guide plate 7, and an atomizing nozzle 702 for spraying a release agent is installed on the lower end surface of the mounting frame 701. A reflux channel 704 for recovering the release agent is provided in the bottom of the material guide plate 7, and the lower end of the reflux channel 704 is connected to the cooling channel 201, and the outlet of the cooling channel 201 is connected to a heat dissipation groove 8, and a pump body 9 is provided on the heat dissipation groove 8. The pump body 9 conveys the release agent to the atomizing nozzle 702. Specifically, the release agent can be selected from but not limited to silicone oil release agents.

[0059] Among them, a seepage mesh 703 is set in the middle of the guide plate 7 corresponding to the position of the mounting frame 701, and the seepage mesh 703 is connected to the top of the reflux channel 704, and the cooling channel 201 is a spring-shaped spiral channel structure surrounding the inner cavity of the lower mold base 2.

[0060] like Figure 5 As shown, a docking port 202 is provided at the top of the cooling channel 201, and the docking port 202 docks with the lower port of the reflux channel 704. A plurality of liquid outlet pipes 203 are connected to the bottom of the cooling channel 201, and the liquid outlet pipes 203 are communicated with the heat dissipation groove 8. A plurality of heat conducting plates 204 are fixed on the inner wall of the groove body for fixing the lower mold in the lower mold base 2, and a plurality of heat dissipating fins 205 are fixed on the heat conducting plates 204, and the heat dissipating fins 205 extend into the cooling channel 201.

[0061] In addition, if Figure 6 As shown, a filter screen 801 is also provided in the heat dissipation groove 8 for filtering the recovered release agent to ensure the use effect of the release agent.

[0062] Working principle: The re-pressing device for the PBT composite material for automobile exterior can be adapted to the re-pressing method for the PBT composite material for automobile exterior when in use, thereby achieving the beneficial effects that can be achieved by the method.

[0063] At the same time, through structural design and optimization, the device will also facilitate pushing the preheated PBT composite material into the guide plate 7 by arranging an electric push rod 602 and a push plate 603 in the preheating box 6 to avoid scalding the staff; by arranging a mounting frame 701, an atomizing nozzle 702, and a liquid seepage mesh 703 on the guide plate 7, the release agent can be coated on the outer surface of the PBT composite material in the guide plate 7 by spraying, so that when it falls into the lower mold base 2, the release agent is automatically applied; by arranging a cooling channel 201 in the lower mold base 2, and cooperating with the liquid seepage mesh 703 and the reflux channel 704 to recover the release agent, the recovered release agent can flow through the guidance of the cooling channel 201, and continuously bring the heat of the lower mold base in the lower mold base 2 into the heat dissipation groove 8 for dissipation. When the pump body 9 is used to form a recycling process of the release agent, the release agent will be further used to take away a part of the heat in the lower mold base 2, thereby improving the speed of the re-pressing and cooling molding of the PBT composite material in the lower mold base 2 to a certain extent.

[0064] In summary, the present invention not only optimizes the re-pressing process of the PBT composite material and ensures the quality of the automobile exterior, but also, through the equipment of the present invention, can effectively improve the efficiency of re-pressing the PBT composite material into automobile exterior, and the overall use effect is good.

[0065] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method and device for re-pressing a PBT composite material for automobile exterior, characterized in that: The following steps are involved: S1. Material preheating: preheating the PBT composite material; S2. Material coating release agent: Apply release agent on the surface of preheated PBT composite material; S3, material re-pressing and molding: putting the PBT composite material coated with a release agent into a mold and re-pressing it; S4, cooling and demoulding: After the PBT composite material is re-pressed, it is cooled in the mold and demoulding is performed.

2. The method for re-pressing the PBT composite material for automobile exterior according to claim 1, characterized in that: When preheating the PBT composite material, the preheating temperature is controlled to be 180-220°C and the preheating time is 10-20 minutes.

3. The method for re-pressing the PBT composite material for automobile exterior according to claim 1, characterized in that: The release agent includes a silicone oil release agent, and the coating thickness is 0.1-0.3 mm.

4. The re-pressing method of the PBT composite material for automobile exterior according to claim 1, characterized in that: When the PBT composite material coated with the release agent is subjected to re-pressing molding, the re-pressing pressure is controlled to be 10-15MPa and the re-pressing time is 5-10 minutes.

5. A re-pressing device for a PBT composite material for automobile exterior, applicable to a re-pressing method for a PBT composite material for automobile exterior according to any one of claims 1 to 4, characterized in that: It comprises a base plate (1), wherein a lower die seat (2) is fixed at one end of the upper end surface of the base plate (1), and a support frame (5) is fixed at the other end; An upper die seat (4) is provided above the lower die seat (2), a plurality of cooling channels (201) surrounding the lower die are provided in the lower die seat (2), a preheating box (6) is fixed on the top of the support frame (5), a material guide plate (7) is provided at the material outlet of the preheating box (6), and the material guide plate (7) is tilted downward and butted against the upper edge of the lower die seat (2); The guide plate (7) is provided with a mounting frame (701), and an atomizing nozzle (702) for spraying a release agent is installed on the lower end surface of the mounting frame (701). A reflux channel (704) for recovering the release agent is provided in the bottom of the guide plate (7), and the lower end of the reflux channel (704) is connected to the cooling channel (201), and the outlet of the cooling channel (201) is connected to a heat dissipation groove (8), and a pump body (9) is matched on the heat dissipation groove (8), and the pump body (9) conveys the release agent to the atomizing nozzle (702).

6. The re-pressing device of the PBT composite material for automobile exterior according to claim 5, characterized in that: A fixing frame (3) is fixed on one side of the lower die base (2), and a cylinder (301) is installed on the top of the fixing frame (3). The cylinder (301) is located directly above the lower die base (2), and the axis of the cylinder (301) is vertically downward, and the upper die base (4) is fixed thereto.

7. The re-pressing device of the PBT composite material for automobile exterior according to claim 5, characterized in that: A box door (601) is provided on one side of the preheating box (6) facing the upper end of the material guide plate (7), and an electric push rod (602) is fixed to the outside of the preheating box (6) away from the box door (601), and the shaft of the electric push rod (602) extends horizontally into the preheating box (6) and is fixed with a push plate (603).

8. The re-pressing device of the PBT composite material for automobile exterior according to claim 5, characterized in that: A liquid seepage mesh hole (703) is provided in the middle of the guide plate (7) at a position corresponding to the mounting frame (701), and the liquid seepage mesh hole (703) is in communication with the top of the reflux channel (704).

9. The re-pressing device of the PBT composite material for automobile exterior according to claim 8, characterized in that: The cooling channel (201) is a spring-shaped spiral channel structure surrounding the inner cavity of the lower mold base (2), and a docking port (202) is provided at the top of the cooling channel (201), and the docking port (202) is docked with the lower port of the reflux channel (704). The bottom of the cooling channel (201) is connected to a plurality of liquid outlet pipes (203), and the liquid outlet pipes (203) are in communication with the heat dissipation groove (8).

10. The re-pressing device of the PBT composite material for automobile exterior according to claim 9, characterized in that: A plurality of heat conducting plates (204) are fixed on the inner wall of the groove body for fixing the lower mold in the lower mold base (2), a plurality of heat dissipating fins (205) are fixed on the heat conducting plates (204), and the heat dissipating fins (205) extend into the cooling channel (201).

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