High-precision gluing and pressing process for automotive upholstery

Abstract

The invention relates to a high-precision automotive upholstery gluing and pressing process. The process comprises the following steps that firstly, the face, to be sprayed, of an automotive upholstery is pretreated; secondly, the surface to be sprayed is evenly sprayed with glue; thirdly, the automobile interior trim part obtained after glue spraying is completed is dried and cured; fourthly, the dried automobile interior trim part is subjected to primary press fit; fifthly, manual glue supplementing and re-pressing procedures are carried out on the unfirm positions; the decorative leather sprayed with glue is automatically smoothed, on one hand, the flatness of the decorative leather is improved, on the other hand, the position of the decorative leather is preliminarily fixed, position movement is reduced, and therefore the possibility that wrinkles and bumps are generated after pressing is reduced; the heater is arranged below the station part, and the pretreatment procedure is set, so that sprayed glue on the automotive interior trim part is uniformly softened, the contact area of a glue surface and decorative leather is increased, meanwhile, impurities on the contact surface are reduced, the purity of glue is improved, and the possibility of edge warping after pressing is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile interior decoration processing technology, in particular to a high-precision automobile interior decoration gluing and pressing process. Background Art

[0002] In order to increase the aesthetics of automobile interiors, improve the grade of vehicles, and protect the body, leather is usually used to cover automobile interior parts. During the existing gluing and pressing process, the adhesion edges are prone to warping, and bulging and wrinkles are prone to occur during the pressing process, affecting the aesthetics. Therefore, we designed a high-precision automotive interior parts gluing and pressing process.

[0003] Patent number CN202210521827.1 is a Chinese invention patent, which discloses a method for leather covering automotive interior parts based on 3D printing technology, which specifically includes the following steps: S1, using 3D printing to obtain an interior substrate member, and polishing the appearance surface of the interior substrate member; S2, cutting leather according to the unfolded view of the interior substrate member; S3, configuring an adhesive for the interior substrate member and the leather covering according to a preset ratio; S4, applying the adhesive to the appearance surface of the interior substrate member and the covering surface of the leather respectively, and drying them; S5, covering the leather on The substrate interior parts are placed in an oven for baking, and local positions are trimmed and vented; S6, using a cutter to remove excess leather from the edge of the substrate interior parts after being coated with leather; the automotive interior parts made by this coating method not only have a good appearance, but also improve the touch and comfort experience. After experimental measurement and technical identification, they meet the overall design standard requirements of the vehicle model. However, the invention has the following problems: first, it does not have the improvement of the pressing flatness, and bulging and wrinkles are prone to occur during the pressing process, affecting the aesthetics; secondly, it does not have the improvement of the pressing adhesion, and there is a high probability of warping after gluing and pressing. Summary of the invention

[0004] The purpose of the present invention is to address the shortcomings of the prior art. By arranging automatic smoothing for the decorative leather on which the glue is sprayed, arranging a heater under the workpiece, and performing pretreatment, the technical problems that the adhesion edges are prone to warping during the existing gluing and pressing process, bulging and wrinkling are prone to occur during the pressing process, affecting the aesthetics and having a low yield are solved.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The high-precision automotive interior parts gluing and pressing process includes the following steps:

[0007] Step 1: Pre-treat the side of the automotive interior parts to be sprayed to increase its surface roughness and cleanliness;

[0008] Step 2: transport the pre-treated automotive interior parts to the automatic spraying station and evenly spray glue on the surface to be sprayed;

[0009] Step 3: Transport the glue-sprayed automotive interior parts to a drying oven for drying and curing. The temperature of the drying oven is set to 70 degrees Celsius and the drying time is 10-15 minutes.

[0010] Step 4: transport the dried automotive interior parts to the pressing device, place the decorative leather on the top, and perform the initial pressing;

[0011] Step 5: After the car interior panels are left to stand for 72 hours after pressing, they are tested and the loose parts are manually glued and re-pressed.

[0012] As a preference, the pretreatment comprises the following two steps:

[0013] Step 1: Use sandpaper or a grinder to grind the surface of the automotive interior parts to be sprayed. The surface roughness after grinding is Ra≤6.3;

[0014] Step 2: Dust the polished surface of the car interior parts to remove the powder polished on the surface.

[0015] As a preferred embodiment, in the step 2, the spraying robot on the automatic spraying station sequentially sprays on the surface to be sprayed of the automobile interior trim part along the glue coating path, and the glue coating thickness in the initial stage is 410 microns to 420 microns.

[0016] As a preferred embodiment, in step 4, the pressing device is provided with a heater and a workpiece position, the initial heating temperature of the heater is 50 degrees Celsius, the workpiece position and the automobile interior decoration parts placed thereon are evenly heated, and the sprayed glue of the automobile interior decoration parts recovers its viscosity.

[0017] As a preferred embodiment, in the step 4, after the decorative leather is placed on top of the sprayed glue, it is automatically smoothed using an automatic scraper and manually adjusted according to the shape of the automobile interior trim.

[0018] As a preferred embodiment, in the step 4, after the decorative leather and the automobile interior trim are initially pressed together, the leather is trimmed along the shape of the interior trim substrate with a cutter and then cooled and dried.

[0019] As a preferred embodiment, in the step 5, the automobile interior decoration parts covered with leather are inspected for bulges and unevenness, and are vented or flattened by a fine needle.

[0020] As a preferred embodiment, in the step five, the automobile interior trim parts covered with leather are detected to see if there is warping, a wet gauze is covered on the surface of the decorative leather, and the warping position is manually sprayed with glue and then re-pressed and left to stand.

[0021] Beneficial effects of the present invention:

[0022] (1) In the present invention, the decorative leather on which the glue is sprayed is automatically smoothed, thereby increasing the flatness of the decorative leather and preliminarily fixing the position of the decorative leather to reduce position movement, thereby reducing the possibility of wrinkles and bulges after pressing.

[0023] (2) In the present invention, a heater is arranged under the work piece. In a conventional production line, problems such as uneven heating and shifting of the glue after softening may occur during the air outlet heating process using a hot air blower. The heater uniformly heats the automobile interior decoration parts on the work piece, so that the sprayed glue on the automobile interior decoration parts is uniformly softened, ensuring uniform adhesion while reducing the possibility of warping of the decorative leather during pressing.

[0024] (3) In the present invention, by providing a pretreatment, on the one hand, the roughness of the surface of the automobile interior decoration part is increased to increase the contact area between the rubber surface and the decorative leather, thereby increasing the adhesion strength; on the other hand, impurities on the contact surface are reduced, the purity of the rubber is increased, and the adhesion of the rubber surface is ensured, thereby reducing the possibility of warping after lamination.

[0025] In summary, the invention has the advantages of simple process, uniform glue coating and high yield rate, and is particularly suitable for the field of automobile interior decoration processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall process of gluing and pressing high-precision automotive interior parts.

[0028] Figure 2 Schematic diagram of the pre-processing process.

[0029] Figure 3 Schematic diagram of the process flow of step four. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0031] Embodiment 1

[0032] like Figures 1 to 3 As shown, the present invention provides a high-precision automotive interior parts gluing and pressing process, comprising the following steps:

[0033] Step 1: Pre-treat the side of the automotive interior parts to be sprayed to increase its surface roughness and cleanliness;

[0034] Step 2: transport the pre-treated automotive interior parts to the automatic spraying station and evenly spray glue on the surface to be sprayed;

[0035] Step 3: Transport the glue-sprayed automotive interior parts to a drying oven for drying and curing. The temperature of the drying oven is set to 70 degrees Celsius for 10-15 minutes to prevent the glue from flowing downward under the action of gravity, causing uneven glue distribution and unclear glue surface boundaries.

[0036] Step 4: transport the dried automobile interior parts to the pressing device, place the decorative leather on the upper part, and perform the initial pressing to fix the decorative leather on the surface of the automobile interior parts;

[0037] Step 5: After the car interior panels are left to stand for 72 hours after pressing, they are inspected and the loose positions are manually glued and re-pressed to ensure the quality of the finished product.

[0038] Further, if Figure 2 As shown, the preprocessing includes the following two steps:

[0039] Step 1: Use sandpaper or a grinder to grind the surface of the automotive interior parts to be sprayed. The surface roughness after grinding is Ra≤6.3. Increasing the roughness of the surface of the automotive interior parts can increase the contact area between the rubber surface and the decorative leather, thereby increasing the adhesion strength;

[0040] Step 2: Dust the polished surface of the car interior parts to remove the powder polished on the surface, reduce impurities on the contact surface, increase the purity of the glue, ensure the adhesion of the glue surface, and thus reduce the possibility of warping after pressing.

[0041] Furthermore, in the step 2, the spraying robot on the automatic spraying station sequentially sprays on the surface to be sprayed of the automobile interior parts along the glue coating path. The glue coating thickness in the initial stage is 410 microns to 420 microns. Uniform spraying helps to improve the quality of adhesion and fixation.

[0042] Further, if Figure 3As shown, in the step four, the pressing device is provided with a heater and a workpiece position, the initial heating temperature of the heater is 50 degrees Celsius, the workpiece position and the automobile interior decoration parts placed thereon are evenly heated, and the sprayed glue of the automobile interior decoration parts is restored to viscosity. By arranging a heater under the workpiece position, the conventional production line uses a hot air blower. During the air outlet heating process, problems such as uneven heating and displacement of the glue after softening are prone to occur. The heater evenly heats the automobile interior decoration parts on the workpiece position, so that the sprayed glue on the automobile interior decoration parts is evenly softened, ensuring the uniformity of adhesion while reducing the possibility of warping of the decorative leather during pressing.

[0043] Furthermore, in the step four, after the decorative leather is placed on top of the sprayed glue, it is automatically smoothed using an automatic scraper and manually adjusted according to the shape of the automobile interior parts. By setting the automatic smoothing of the decorative leather on the sprayed glue, on the one hand, the flatness of the decorative leather is increased, and on the other hand, the position of the decorative leather is preliminarily fixed to reduce position movement, thereby reducing the possibility of wrinkles and bulging after pressing.

[0044] Further, if Figure 3 As shown, in the step 4, after the decorative leather and the automobile interior trim are initially pressed together, the leather is trimmed along the shape of the interior substrate with a cutter, cooled and dried, and the bonding portion between the dried decorative leather and the glue is polished. The glue on the edge of the decorative leather is evenly treated by polishing to avoid dents or bulges, and to prevent bubbles from expanding due to heat during subsequent coating, thereby affecting the coating effect.

[0045] Furthermore, in the step five, the automobile interior decoration parts covered with leather are inspected for bulges and unevenness, and fine needle venting or scraping is used to achieve a good repair and shaping effect.

[0046] Furthermore, in the step five, the automobile interior decoration parts covered with leather are detected to see if there are warped edges, and the surface of the decorative leather is covered with wet gauze. The warped edge positions are manually sprayed with glue and then re-pressed and allowed to stand. Covering the surface of the decorative leather with wet gauze can prevent the glue sprayed from the spray gun from being stained on the decorative leather, thereby ensuring the correctness of the decorative leather and reducing subsequent processing.

[0047] Working process: first, pre-treat the side of the automobile interior parts to be sprayed to increase its surface roughness and cleanliness; further, transport the pre-treated automobile interior parts to the automatic spraying station, and evenly spray glue on the surface to be sprayed; further, transport the automobile interior parts that have been sprayed with glue to a drying box for drying and curing. The temperature of the drying box is set to 70 degrees Celsius, and the drying time is 10-15 minutes to prevent the glue from flowing downward under the action of gravity and causing uneven glue distribution and unclear glue surface boundaries; further, transport the dried automobile interior parts to the pressing device, place the decorative leather on the upper part, and perform the initial pressing to fix the decorative leather on the surface of the automobile interior parts; further, inspect the automobile interior panels after standing for 72 hours after pressing, and perform manual glue filling and re-pressing processes on the loose positions to ensure the quality of the finished product.

[0048] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0049] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. High-precision automotive interior parts gluing and pressing process, characterized by: The following steps are involved: Step 1: Pre-treat the side of the automotive interior parts to be sprayed to increase its surface roughness and cleanliness; Step 2: transport the pre-treated automotive interior parts to the automatic spraying station and evenly spray glue on the surface to be sprayed; Step 3: Transport the glue-sprayed automotive interior parts to a drying oven for drying and curing. The temperature of the drying oven is set to 70 degrees Celsius and the drying time is 10-15 minutes. Step 4: transport the dried automotive interior parts to the pressing device, place the decorative leather on the top, and perform the initial pressing; Step 5: After the car interior panels are left to stand for 72 hours after pressing, they are tested and the loose parts are manually glued and re-pressed.

2. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: The pre-processing includes the following two steps: Step 1: Use sandpaper or a grinder to grind the surface of the automotive interior parts to be sprayed. The surface roughness after grinding is Ra≤6.3; Step 2: Dust the polished surface of the car interior parts to remove the powder polished on the surface.

3. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: In the step 2, the spraying robot on the automatic spraying station sprays on the surface to be sprayed of the automobile interior trim along the glue coating path in sequence, and the glue coating thickness in the initial stage is 410 microns to 420 microns.

4. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: In the step 4, the pressing device is provided with a heater and a workpiece position, the initial heating temperature of the heater is 50 degrees Celsius, the workpiece position and the automobile interior decoration parts placed thereon are evenly heated, and the sprayed glue of the automobile interior decoration parts is restored to viscosity.

5. The high-precision automotive interior parts gluing and pressing process according to claim 4 is characterized in that: In the step 4, after the decorative leather is placed on the top of the sprayed glue, it is automatically smoothed using an automatic scraper and manually adjusted according to the shape of the automobile interior trim.

6. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: In the step 4, after the decorative leather and the automobile interior trim are initially pressed together, the leather is trimmed along the shape of the interior trim substrate with a cutter and then cooled and dried.

7. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: In the step 5, the automobile interior decoration parts covered with leather are inspected for bulges and unevenness, and a fine needle is used to vent or scrape them flat.

8. The high-precision automotive interior parts gluing and pressing process according to claim 1 is characterized in that: In the step 5, whether the automobile interior decoration part covered with leather has warped edges is detected, a wet gauze is covered on the surface of the decorative leather, and the warped edge position is manually sprayed with glue, then re-pressed and left to stand.

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