阅读说明：本技术 汽车内饰件的tom成型工艺 (TOM (tool to machine) forming process of automotive interior trim part ) 是由 金一峰 陈强 徐亚娟 郭建华 于 2021-05-26 设计创作，主要内容包括：本发明涉及汽车内饰件的TOM成型工艺,其包括如下步骤：S1、塑料件预处理和装载；S2、热覆膜的形成；S3、余边整修。本发明一方面在无需胶粘的前提下,通过热覆膜的模式,实现装饰件表面的装饰,节能环保；另一方面通过上下箱体内的压力变化,并保持装饰膜两端张紧的模式下,使其在高温和设定的压力下进行热覆膜,不仅确保装饰膜的贴合度,而且所形成的接合力强,不易出现起皮、脱落等现象发生,此外,覆膜之前通过塑料件表面的等离子处理,进一步提高凹坑处的耐剥离强度,再提升装饰膜和塑料件的接合力。(The invention relates to a TOM (tool to machine) molding process of an automotive interior trim part, which comprises the following steps of: s1, preprocessing and loading plastic parts; s2, forming a hot coating; and S3, trimming the residual edge. On the one hand, the invention realizes the decoration of the surface of the decorating part through the mode of hot coating without gluing, thereby saving energy and protecting environment; on the other hand, the thermal coating is carried out under high temperature and set pressure by changing the pressure in the upper box body and the lower box body and keeping the two ends of the decorative film tensioned, so that the attaching degree of the decorative film is ensured, the formed bonding force is strong, and the phenomena of peeling, falling and the like are not easy to occur.)

1. The TOM forming process of the automotive interior part is used for covering a decorative film on the surface of a plastic part, and is characterized in that: which comprises the following steps:

s1 pretreatment and loading of plastic parts

a) Firstly, carrying out plasma surface treatment on the surface to be coated of the plastic part;

b) arranging the plastic piece subjected to plasma treatment on a loading mould from the surface to be coated upwards;

s2 formation of Hot-melt film

a) Transferring the loading mold and the product to be coated to a coating center, and descending the loading mold and the product to be coated to the lower part of the decorative film transmission path;

b) the decoration film is unfolded and extends along the opening of the lower cavity of the center of the film covering to close the loading mould and the product to be film covered in the lower cavity;

c) the upper cavity body at the center of the film is covered, so that the upper cavity body and the lower cavity body are closed, and the decorative film is horizontally and tightly positioned between the upper cavity body and the lower cavity body;

d) respectively and simultaneously vacuumizing the upper cavity and the lower cavity, heating by a heating part in the upper cavity, and heating the decorative film at the temperature of 130 +/-5 ℃ in a dynamic balance state for 10 +/-3 s;

e) lifting the loading mold and the product to be coated upwards, pushing the decorative film above the loading mold into the upper cavity, contacting the top part of the decorative part with the decorative film, introducing positive pressure into the upper cavity, wherein the pressure is 0.28 +/-0.02 MPa, the temperature is 130 +/-5 ℃, and the decorative film is uniformly thermally compounded to the surface of the plastic part for 2 +/-1 seconds, and meanwhile, the lower cavity is kept in a negative pressure state;

f) stopping heating, relieving pressure of the upper cavity and the lower cavity, lifting the upper cavity upwards to separate the upper cavity from the lower cavity, and cutting the decorative film, wherein the loading mold and the film-coated product can be taken out from the film coating center;

s3, trimming

And removing the redundant decorative film at the corners of the coated product.

2. The TOM molding process for automotive upholstery according to claim 1, wherein: in S1, the loading mold is simultaneously covered with a plurality of plastic pieces, and the plastic pieces are spaced apart from each other.

3. The TOM molding process for automotive upholstery according to claim 1, wherein: in d) of S2, the pressures of the upper and lower chambers are equalized.

4. The TOM molding process for automotive upholstery according to claim 1, wherein: in e) of S2, the bottom surface of the lift loading mold is flush with the opening of the lower cavity.

5. The TOM molding process for automotive upholstery according to claim 1, wherein: in f) of S2, when the decorative film is cut, dust used in cutting is collected by a dust collector that moves in synchronization with the cutting blade.

6. The TOM molding process for automotive upholstery according to claim 1, wherein: the molding apparatus employed comprises:

the plasma processing unit is used for carrying out plasma processing on the surface to be coated of the plastic part;

a loading mould for placement of plastic parts;

the thermoforming unit comprises a lower box body with an upward opening, an upper box body which is movably arranged above the lower box body up and down and can close the opening of the lower box body, a lifting platform which is positioned in the lower box body and can move up and down, a heating component which is positioned in the upper box body, a film feeding component of a decorative film which is positioned on one side of the lower box body, and a pressure adjusting component, wherein the film feeding component feeds the film from one side of the opening to the other side, when the upper box body and the lower box body are closed, the decorative film separates the upper box body from the lower box body and forms an upper cavity and a lower cavity which are sealed relatively, and the pressure adjusting component is used for adjusting the pressure in the cavities;

a film cutting unit for cutting the decorative film after thermoforming;

and the mould receiving and feeding unit comprises two or more transmission lines communicated with the thermal forming unit and a robot arranged between two adjacent transmission lines, wherein the robot transfers the loading mould between the transmission lines and the lifting platform.

7. The TOM molding process for automotive upholstery according to claim 6, wherein: the pressure regulating component comprises a positive pressure supply; a negative pressure supplier; the first pipeline and the second pipeline are respectively communicated with the lower box body and the upper box body at one end part; a third pipeline used for communicating the other ends of the first pipeline and the second pipeline; a fourth pipeline and a fifth pipeline which respectively communicate both end portions of the third pipeline with the positive pressure supplier and the negative pressure supplier; and a first pipeline,

And the air flow reversing valve is arranged at the communication part of the third pipeline and the fourth pipeline.

8. The TOM molding process for automotive upholstery according to claim 7, wherein: the pressure adjusting part is provided with a first working mode and a second working mode, wherein when the pressure adjusting part is in the first working mode, the decorative film is horizontally arranged between the upper box body and the lower box body, the upper box body and the lower box body are both in a vacuum-pumping state, the heating part heats the decorative film, and the temperature in the upper box body is 130 +/-2 ℃; when being in the second mode of operation, it is in the malleation to go up the box, the box is in the negative pressure down, it rises to load the mould go up in the box, the surface at the working of plastics is established to the decoration membrane laminating, go up the internal temperature of box and be 130 +/-2 ℃, and pressure is 0.28 +/-0.01 Mpa.

9. The TOM molding process for automotive upholstery according to claim 8, wherein: the heating component is positioned on the inner wall of the top of the upper box body through a heat insulation seat, the air outlet end of the first pipeline is positioned below the heating component, the heat insulation seat comprises a seat plate and a seat strip, the seat plate is parallel to the top wall of the upper box body, the seat strip is used for fixedly connecting the seat plate with the inner wall of the top, and the heating component is arranged on the seat plate and can comprehensively radiate the lower lifting platform; the seat strip has two, and is located the relative both sides of bedplate, wherein the seat strip the bedplate reaches the inner wall of last box forms the side flow chamber, bedplate below form the heating chamber, both sides the side flow chamber with the heating chamber is linked together.

10. The TOM molding process for automotive upholstery according to claim 6, wherein: the film feeding part comprises a film unwinding mechanism and a film traction mechanism, wherein in the film coating of the thermal forming unit, the decorative film is positioned between the film unwinding mechanism and the film traction mechanism; a film clamping mechanism is further arranged on the inner wall of the opening of the lower box body, and when film is coated, a decorative film is positioned between the film clamping mechanism and the film traction mechanism; the film clamping mechanisms are two groups and are arranged side by side, and the film cutting units are positioned between the two groups of film clamping mechanisms.

Technical Field

The invention belongs to the field of automobile ornament processing equipment, and particularly relates to a TOM (tool for manufacturing) molding process of an automobile interior ornament.

Background

With the increasing viewing requirements of interior trims of automobiles, a general interior trim includes a plastic body, and a decorative film, such as tom (three dimensional Overlay method), coated on the surface of the plastic body, i.e., a three-dimensional surface decoration.

However, the most common means of coating is gluing, but this means of gluing has the following drawbacks:

1. because some toxic or harmful substances are inevitably mixed in the glue, the environment protection aspect has obvious defects, and the health of a user is seriously influenced;

2. easy degumming and short life, for example: in summer, the temperature of the automobile is higher (about 80 ℃) after the automobile is exposed to the sun, and at the moment, the decorative film is easy to fall off from the plastic body.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a brand-new TOM forming process for automotive interior parts.

In order to solve the technical problems, the invention adopts the following technical scheme:

a TOM forming process of an automotive interior part is used for coating a decorative film on the surface of a plastic part and comprises the following steps:

s1 pretreatment and loading of plastic parts

a) Firstly, carrying out plasma surface treatment on the surface to be coated of the plastic part;

b) arranging the plastic piece subjected to plasma treatment on a loading mould from the surface to be coated upwards;

s2 formation of Hot-melt film

a) Transferring the loading mold and the product to be coated to a coating center, and descending the loading mold and the product to be coated to the lower part of the decorative film transmission path;

b) the decoration film is unfolded and extends along the opening of the lower cavity of the center of the film covering to close the loading mould and the product to be film covered in the lower cavity;

c) the upper cavity body at the center of the film is covered, so that the upper cavity body and the lower cavity body are closed, and the decorative film is horizontally and tightly positioned between the upper cavity body and the lower cavity body;

d) respectively and simultaneously vacuumizing the upper cavity and the lower cavity, heating by a heating part in the upper cavity, and heating the decorative film at the temperature of 130 +/-5 ℃ in a dynamic balance state for 10 +/-3 s;

e) lifting the loading mold and the product to be coated upwards, pushing the decorative film above the loading mold into the upper cavity, contacting the top part of the decorative part with the decorative film, introducing positive pressure into the upper cavity, wherein the pressure is 0.28 +/-0.02 MPa, the temperature is 130 +/-5 ℃, and the decorative film is uniformly thermally compounded to the surface of the plastic part for 2 +/-1 seconds, and meanwhile, the lower cavity is kept in a negative pressure state;

f) stopping heating, relieving pressure of the upper cavity and the lower cavity, lifting the upper cavity upwards to separate the upper cavity from the lower cavity, and cutting the decorative film, wherein the loading mold and the film-coated product can be taken out from the film coating center;

s3, trimming

And removing the redundant decorative film at the corners of the coated product.

Preferably; in S1, the loading mold is simultaneously covered with a plurality of plastic pieces, and the plastic pieces are spaced apart from each other. Thus, the loss of the decorative film can be effectively reduced, and the cost can be reduced.

Preferably, in d) of S2, the pressures of the upper and lower chambers are equal. Therefore, the dynamic balance can be kept, and the deformation of the decorative film after heating is avoided.

Preferably, in e) of S2, the bottom surface of the lift loading mold is flush with the opening of the lower cavity.

Preferably, in f) of S2, when the decorative film is cut, dust used in the cutting is collected by a dust collector moving in synchronization with the cutting blade. The dust in the film coating process is prevented from influencing the quality of the hot coating film.

According to yet another embodiment and preferred aspect of the present invention, the TOM forming process employs a forming apparatus comprising:

the plasma processing unit is used for carrying out plasma processing on the surface to be coated of the plastic piece;

a loading mould for placement of plastic parts;

the thermoforming unit comprises a lower box body with an upward opening, an upper box body which is movably arranged above the lower box body up and down and can close the opening of the lower box body, a lifting platform which is positioned in the lower box body and can move up and down, a heating component which is positioned in the upper box body, a film feeding component of a decorative film which is positioned on one side of the lower box body, and a pressure adjusting component, wherein the film feeding component feeds the film from one side of the opening to the other side, when the upper box body and the lower box body are closed, the decorative film separates the upper box body from the lower box body and forms an upper cavity and a lower cavity which are sealed relatively, and the pressure adjusting component is used for adjusting the pressure in the cavities;

a film cutting unit for cutting the decorative film after thermoforming;

and the mould receiving and feeding unit comprises two or more transmission lines communicated with the thermal forming unit and a robot arranged between the two adjacent transmission lines, wherein the robot transfers the loaded mould between the transmission lines and the lifting platform.

Preferably, the pressure regulating part includes a positive pressure supplier; a negative pressure supplier; a first pipeline and a second pipeline, one end of each pipeline is communicated with the lower box body and the upper box body respectively; a third pipeline used for communicating the other ends of the first pipeline and the second pipeline; a fourth pipeline and a fifth pipeline which respectively communicate two end parts of the third pipeline with the positive pressure supplier and the negative pressure supplier; and the airflow reversing valve is arranged at the communication part of the first pipeline, the third pipeline and the fourth pipeline. Here, through the intercommunication of pipeline, the internal air pressure control of box about being convenient for to accomplish the tectorial membrane under reasonable temperature and pressure.

According to a specific implementation and preferred aspect of the invention, the pressure adjusting part has a first operation mode and a second operation mode, wherein in the first operation mode, the decoration film is horizontally arranged between the upper box body and the lower box body, the upper box body and the lower box body are both in a vacuum state, and the heating part heats the decoration film; when the loading mould is in the second working mode, the upper box body is in positive pressure, the lower box body is in negative pressure, the loading mould is lifted into the upper box body, and the decorative film is covered on the surface of the plastic part. By switching between the two modes, on one hand, when the decorative film is heated, the deformation of the film after heating (keeping a horizontal state) can be reduced; on the other hand, a high-quality coating film can be easily decorated under a positive pressure.

Preferably, in the first working mode, the temperature in the upper box body is 130 +/-5 ℃; in the second working mode, the temperature in the upper box body is 130 +/-5 ℃, and the pressure is 0.28 +/-0.02 MPa. Therefore, even if the film is exposed, the film can not be stripped, and meanwhile, the adhesive is not needed, so that the energy is saved and the environment is protected.

According to a further embodiment and preferred aspect of the present invention, the heating member is positioned at a top inner wall of the upper cabinet by a heat insulating base, and the air outlet end of the first duct is positioned below the heating member. The formed hot air flow can attach the film to the surface of the plastic part when the pressure is positive.

Preferably, the heat insulation seat includes the parallel bedplate of last box roof, is used for bedplate and top inner wall fixed connection's seat strip, and the heater block setting just can radiate the lift platform of below comprehensively on the bedplate. Thus, the heat coating can be performed in all directions, and the quality of the heat coating can be ensured.

Specifically, the seat strip has two, and is located the relative both sides of bedplate, and wherein the inner wall of seat strip, bedplate and last box forms the side flow chamber, and the bedplate below forms the heating chamber, and both sides side flow chamber is linked together with the heating chamber. With the arrangement, airflow is formed along the inner wall of the upper box body and blown to the lower side of the loading mold, so that the decoration part can finish hot coating in the same environment.

In addition, the film feeding part comprises a film unwinding mechanism and a film drawing mechanism, wherein in the film coating of the thermoforming unit, the decorative film is positioned between the film unwinding mechanism and the film drawing mechanism. That is, the heat-laminating process is performed while the decoration film is still kept in a relatively tensioned state, thereby improving the quality of the heat-laminating film.

Preferably, a film clamping mechanism is further arranged on the inner wall of the opening of the lower box body, and when the film is coated, the decorative film is positioned between the film clamping mechanism and the film traction mechanism; the film clamping mechanisms are arranged in two groups and are arranged side by side, and the film cutting unit is positioned between the two groups of film clamping mechanisms. The film clamping mechanism is arranged, so that the decorative film can be continuously fed and cut conveniently.

Meanwhile, the TOM forming equipment also comprises a plasma processing unit for carrying out plasma processing on the surface to be coated of the plastic piece. The adhesive strength of the hot-coating film is further improved by plasma treatment of the surface of the plastic part.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

on the one hand, the invention realizes the decoration of the surface of the decorating part through the mode of hot coating without gluing, thereby saving energy and protecting environment; on the other hand, the thermal coating is carried out under high temperature and set pressure by changing the pressure in the upper box body and the lower box body and keeping the two ends of the decorative film tensioned, so that the attaching degree of the decorative film is ensured, the formed bonding force is strong, and the phenomena of peeling, falling and the like are not easy to occur.

Drawings

The invention is described in further detail below with reference to the figures and specific examples.

FIG. 1 is a schematic top view of a TOM forming apparatus according to the present invention;

FIG. 2 is a schematic structural view of the TOM forming apparatus of FIG. 1 prior to hot lamination;

FIG. 3 is a schematic structural view of the TOM molding apparatus of FIG. 1 in a first operating mode;

FIG. 4 is a schematic structural view of the TOM molding apparatus of FIG. 1 in a second operating mode;

FIG. 5 is a schematic diagram of the TOM forming apparatus of FIG. 1 after cutting and unloading;

FIG. 6 is a schematic flow chart of the TOM molding process of the present invention;

wherein: 1. loading a mould;

2. a thermoforming unit; 20. a lower box body; 21. an upper box body; 22. a lifting platform; 23. a heating member; 24. a film feeding member; 240. a film unwinding mechanism; 241. a film pulling mechanism; 242. a film clamping mechanism; 25. a pressure regulating member; 250. a positive pressure supply; 251. a negative pressure supplier; 252. a first pipeline; 253. a second pipeline; 254. a third pipeline; 255. a fourth pipeline; 256. a fifth pipeline; 257. an airflow directional control valve; 26. a heat insulating base; 260. a seat plate; 261. seat strips; c. a side flow chamber; j. a heating cavity; m, decorating the film; s, decorative parts;

3. a film cutting unit;

4. a mould receiving and feeding unit; 40. a transmission line; 41. a robot.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature. It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1 and 2, the molding device adopted in the TOM molding process of the automotive interior part of the present embodiment is used for coating a decorative film m on the surface of a plastic part, and the molding device includes a loading mold 1, a thermal molding unit 2, a film cutting unit 3, a mold receiving and feeding unit 4, and a plasma processing unit.

Specifically, the loading mold 1 is mainly used for placing the plastic part s.

In this example, the entire surface of the loading mold 1 should be laid out at maximum in a rational layout in consideration of the usage rate of the decorative film m.

The thermoforming unit 2 includes a lower box 20 with an upward opening, an upper box 21 movably disposed above the lower box 20 and capable of closing the opening of the lower box, a lifting platform 22 located in the lower box 20 and capable of moving up and down, a heating member 23 located in the upper box 21, a film feeding member 24 for the decoration film m located on one side of the lower box 20, and a pressure adjusting member 25.

Referring to fig. 3, when the film feeding member 24 feeds the film from one side of the opening to the other side, and the upper case 21 and the lower case 20 are closed, the decorative film m separates the upper case 21 and the lower case 20 to form two upper and lower relatively sealed cavities, and the pressure adjusting member 25 is used for adjusting the pressure in the cavities.

Specifically, the film feeding unit 24 includes two film unwinding mechanisms 240, two film drawing mechanisms 241, and two film clamping mechanisms 242, wherein the two film clamping mechanisms 242 are arranged side by side.

In this example, in the film coating of the thermoforming unit 2, the decorative film m is located between the film clamping mechanism 242 and the film drawing mechanism 241. Not only is convenient for the decorative film to continuously feed the film, but also is convenient for cutting.

The pressure adjusting part 25 includes a positive pressure supplier 250; a negative pressure supplier 251; a first pipe 252 and a second pipe 253 having one ends respectively communicating with the lower tank 20 and the upper tank 21; a third pipe 254 for communicating the other ends of the first and second pipes 252 and 253 with each other; a fourth line 255 and a fifth line 256 which communicate both end portions of the third line 254 with the positive pressure supplier 250 and the negative pressure supplier 251, respectively; and an air flow direction changing valve 257 provided at a communication portion of the first, third, and fourth pipes 252, 254, and 255. Here, through the intercommunication of pipeline, the internal air pressure control of box about being convenient for to accomplish the tectorial membrane under reasonable temperature and pressure.

In this example, the pressure adjusting unit 25 has a first operation mode and a second operation mode, wherein referring again to fig. 3, in the first operation mode, the decoration film m is horizontally disposed between the upper casing 21 and the lower casing 20, and both the upper casing 21 and the lower casing 20 are in a vacuum state, and the heating unit 23 heats the decoration film m, wherein the temperature in the upper casing 21 is 130 ± 2 ℃.

Referring to fig. 4, in the second operation mode, the upper case 21 is under positive pressure and the lower case 20 is under negative pressure, wherein the temperature in the upper case 21 is 130 ± 1 ℃ and the pressure is 0.28 ± 0.01Mpa, and the loading mold 1 is raised into the upper case 21, and the decorative film m covers the surface of the plastic part s. By switching between the two modes, on one hand, when the decorative film is heated, the deformation of the film after heating (keeping a horizontal state) can be reduced; on the other hand, a high-quality coating film can be easily decorated under a positive pressure.

The heating member 23 is positioned on the top inner wall of the upper box 21 by the heat insulating base 26, and the air outlet end of the first pipeline 252 is positioned below the heating member 23. The formed hot air flow can attach the film to the surface of the plastic part when the pressure is positive.

The heat insulation seat 26 comprises a seat plate 260 parallel to the top wall of the upper box 21, a seat strip 261 used for fixedly connecting the seat plate 260 with the inner wall of the top part, and a heating component 23 arranged on the seat plate 260 and capable of radiating the lifting platform 22 below on the whole. Thus, the heat coating can be performed in all directions, and the quality of the heat coating can be ensured.

Specifically, the seat strip 261 has two and is located the opposite both sides of seat plate 260, wherein the inner wall of seat strip 261, seat plate 260 and upper box 21 forms side flow chamber c, forms heating chamber j below the seat plate 260, and both sides side flow chamber c is linked together with heating chamber j. With the arrangement, airflow is formed along the inner wall of the upper box body and blown to the lower side of the loading mold, so that the decoration part can finish hot coating in the same environment.

The film cutting unit 3 is located between the two sets of film clamping mechanisms 242. Therefore, after cutting, the cutting end edge does not need to be searched again, and further, when film laminating is performed next time, the film traction mechanism 241 directly sends out the decorative film m from the film clamping mechanism 242, and hot film laminating of the next group of decorative parts can be completed.

The mold receiving and feeding unit 4 comprises two transmission lines 40 communicated with the thermoforming unit 2 and a robot 41 arranged between two adjacent transmission lines 40, wherein the robot 41 transfers the loading molds 1 between the transmission lines 40 and the lifting platform 22, so that after the film coating of one batch of products is completed, the loading molds 1 are taken out by the robot 41 and transferred to one transmission line 40, meanwhile, the next batch of products are positioned on the other transmission line 40, the next batch of products are positioned on the loading molds 1 and are in a waiting state, and at the moment, the next batch of products and the loading molds 1 are conveyed to the lifting platform 22 together by the robot 41, so that the transfer of different batches of products and loading molds 1 is completed quickly.

In addition, the TOM forming equipment also comprises a plasma processing unit for carrying out plasma processing on the surface to be coated of the plastic part. The adhesive strength of the hot-coating film is further improved by plasma treatment of the surface of the plastic part.

In summary, with reference to fig. 5 and fig. 6, the implementation process of this embodiment is as follows:

the method comprises the following steps:

s1 pretreatment and loading of plastic parts

a) Firstly, carrying out plasma surface treatment on the surface to be coated of the plastic part;

b) arranging the plastic pieces subjected to plasma treatment on a loading mould from the surface to be coated upwards, wherein a plurality of plastic pieces are distributed on the surface of the whole loading mould;

s2 formation of Hot-melt film

a) Transferring the loading mold and the product to be coated to a lifting platform at the center of the coating, and then descending the lifting platform to enable the loading mold and the product to be coated to descend below a decorative film transmission path;

b) the film unwinding mechanism unwinds the film and moves the decorative film from the left side to the right side of the opening of the lower box body through the film traction mechanism, and the decorative film separates the upper box body from the lower box body;

c) the upper box body at the center of the film is covered, so that the upper box body and the lower box body are closed, and the decorative film is horizontally and tightly positioned between the upper box body and the lower box body;

d) respectively and simultaneously vacuumizing the upper box body and the lower box body, heating by a heating part in the upper box body, and heating at the temperature of 130 +/-2 ℃ for 10 +/-1 s when the decorative film is in a dynamic balance state;

e) lifting the lifting platform upwards until the top surface of the lifting platform is flush with the opening of the lower box body, pushing the loading mould and the decorative film above the product to be coated into the upper box body, at the moment, the top part of the decorative film is in contact with the decorative film, then, introducing positive pressure into the upper box body, uniformly thermally compounding the decorative film to the surface of the plastic piece at the pressure of 0.28 +/-0.02 Mpa and the temperature of 130 +/-5 ℃, wherein the duration time is 2 +/-1 second, and simultaneously keeping the lower box body in a negative pressure state;

f) stopping heating, decompressing the upper box body and the lower box body, lifting the upper box body upwards to separate the upper box body from the lower box body, cutting the decorative film formed by hot coating by the film cutting unit, wherein dust is removed while cutting, and after cutting, the loading mold and the coated product can be taken out from the center of the coating film;

s3, trimming

And removing the redundant decorative film at the corners of the coated product.

Meanwhile, under the condition of peeling test of a product formed by the equipment under the condition of 25mm width, the conventional piece is about 18N, however, the measured value is different according to different film manufacturers and types, but the final required value is required to be more than 12N.

The plastic part was molded using substantially the same molding process as described above, except that no plasma treatment was applied to the surface of the plastic part, and the results are shown in table one.

Watch 1

After the process of the application is adopted, the detection results are shown in the table II.

Watch two

Therefore, according to the detection data, when the positions of the pits are more for some special-shaped pieces, if the surface of the plastic piece is not subjected to plasma treatment, the probability that the peel strength meets the requirement is low, and after the surface of the plastic piece is subjected to plasma treatment, the peel strength obviously exceeds the requirement.

In summary, the present embodiment has the following advantages:

1) the decoration of the surface of the decoration part is realized through a hot film coating mode on the premise of no need of gluing, and the decoration is energy-saving and environment-friendly;

2) the pressure in the upper box body and the pressure in the lower box body are changed, and the decorative film is subjected to hot coating under the set pressure in a mode of keeping two ends of the decorative film tensioned, so that the attaching degree of the decorative film is ensured, the formed bonding force is strong, and the phenomena of peeling, falling and the like are not easy to occur;

3) in the hot laminating process, in the heating process of the decorative film, the decorative film is ensured to be in a horizontal state, and once deformation occurs, wrinkles or hollows are easy to generate during laminating, so that the flatness of lamination is directly influenced;

4) the cutting is convenient, and when the film is coated on the next batch of products, the cutting end edge does not need to be searched again, so that the continuous film feeding is convenient;

5) in the process of positive pressure film coating, the formed heat flow acts on the surface of the decorating part positioned on the upper box body relatively uniformly, so that uniform film coating is completed, and meanwhile, the probability of wrinkles or hollows is greatly reduced;

6) and further improving the adhesive force of the hot coating film under the surface plasma treatment of the plastic part.

The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.