Decorative glass fiber forming and pressing process

Abstract

The invention relates to the technical field of chemical production, in particular to a post-decoration glass fiber forming compression process, which comprises the following steps of: directly performing decoration treatment on a UV (ultraviolet) curing coating or a heat transfer film on the surface of a glass fiber semi-cured raw material, and performing structure forming by adopting a smooth curve type pressurization mode and a multi-step slow pressurization step. The surface quality, the precision, the flatness and the roughness of the product are ensured to reach high standards; the surface of the forming equipment mold is coated with a high-temperature-resistant anti-sticking coating, so that the decorative layer is prevented from being stripped or damaged. A software program is integrated with a real-time pressure feedback system, and precise pressure control and dynamic adjustment are achieved. The process is suitable for preparing automotive upholstery, electronic equipment shells and aerospace composite material parts, the surface roughness Ra of a formed product is smaller than or equal to 0.8 micron, and the attractiveness, durability and application universality of the product are remarkably improved. According to the technology, software and hardware technologies are combined, efficient, flexible and high-quality production is achieved, and a new solution is provided for preparation of glass fiber composite products.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production, in particular to a post-decoration glass fiber molding compression process. Background Art

[0002] With the continuous advancement of science and technology and the increasing diversification of market demand, glass fiber materials have been widely used in many fields due to their excellent mechanical properties, lightweight characteristics and other advantages. In the production process of glass fiber products, the molding and compression process is a key link that directly affects the quality and appearance of the product. The traditional glass fiber molding and compression process has gradually exposed many limitations when facing products with high requirements on appearance. The new post-decorative glass fiber molding and compression process came into being. It is committed to solving the problems of traditional processes, bringing new breakthroughs and development opportunities to the production of glass fiber products, and is expected to promote the glass fiber industry to move towards higher quality and more refined directions. The existing glass fiber molding and compression process has the following defects: (1) Outstanding appearance quality issues: At present, most of the glass fiber material decoration processes in the industry mainly adopt two methods: molding and then skinning or skinning and then molding. In addition, the glass fiber shell material is conventionally produced using semi-cured sheets. In the molding process, in order to improve production capacity and efficiency, the impact force method is basically adopted, such as Figure 3 This method can only be applied to products that do not have high appearance requirements, because impact force will cause serious appearance defects such as material cracking and damage to the decorative layer, making it difficult for the product to meet the high-end market's requirements for product refinement and aesthetics in terms of appearance quality.

[0003] (2) Limited product performance: Impact stress not only affects the appearance of the product, but also has a negative impact on product performance. Under impact pressure, the internal structure of the material may produce defects such as microcracks. These microscopic damages will reduce the mechanical properties of glass fiber products, such as strength and toughness, which greatly reduces the reliability and durability of the product during actual use and cannot meet some application scenarios with stringent requirements on product performance.

[0004] (3) Poor process adaptability: The existing glass fiber molding process is relatively simple and lacks sufficient process flexibility and adaptability for glass fiber products of different types, specifications and special design requirements. It is difficult to accurately control key parameters such as pressure and temperature in the molding process according to the specific needs of the product, which limits the innovative design and diversified development of glass fiber products. Summary of the invention

[0005] The purpose of the present invention is to provide a post-decoration glass fiber molding compression process to solve the problems of prominent appearance quality problems, limited product performance and poor process adaptability of the traditional glass fiber molding compression process mentioned in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A post-decoration glass fiber molding pressure process comprises the following steps: S10: Directly perform appearance decoration treatment on the surface of semi-cured fiberglass raw materials; S20: Place the decorated fiberglass material in the molding equipment and use a smooth curve pressurization mode for structural molding; S30: completing material forming through a multi-step slow pressurization step, including applying an increasing pressure gradient from pressurization 1 to pressurization 4 in sequence, followed by pressure holding and pressure relief operations; S40: During the pressurization process, the pressure change rate is 0.5-2MPa / s, and the total molding pressure range is 5-20MPa; S50: The pressure holding stage lasts for 10-30 seconds, and the pressure release stage adopts a linear decreasing mode.

[0007] Preferably, the curing degree of the semi-cured glass fiber raw material in step S10 is 60-80%, and the decorative layer is a UV curing coating or a thermal transfer film.

[0008] Preferably, the smooth curve pressurization mode in step S20 is implemented by matching the pressure control module of the hardware device with the software program, and the software program is set to segmented pressure regulation, and the interval time of each pressurization segment is 3-8 seconds.

[0009] Preferably, the software program integrates a real-time pressure feedback system to dynamically adjust the pressurization rate and holding time according to material deformation data.

[0010] Preferably, the mold surface of the molding equipment in step S20 is coated with a high temperature resistant anti-stick coating with a coating thickness of 50-100 μm to ensure that the decorative layer is not peeled off or damaged during the molding process.

[0011] Preferably, the high temperature resistant anti-stick coating is polytetrafluoroethylene (PTFE) or a ceramic-based composite material.

[0012] Preferably, the gradients of pressurization 1 to pressurization 4 in step S30 are: pressurization 1 is 20-30% of the total pressure, pressurization 2 is 40-50% of the total pressure, pressurization 3 is 60-70% of the total pressure, and pressurization 4 is 80-90% of the total pressure.

[0013] Preferably, the pressure in the pressure holding stage in step S30 is 90-95% of the total pressure, and the mold temperature is controlled at 120-150° C. during the pressure holding period.

[0014] Preferably, the pressure deceleration rate in the pressure relief stage in step S50 is 1-3 MPa / s, and the mold opening time is delayed by 2-5 seconds after the pressure relief is completed.

[0015] Preferably, the process is applied to the preparation of automotive interior trims, electronic equipment housings or aerospace composite material components, and the surface roughness of the product after molding is ≤Ra0.8μm.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) Improve surface quality: By directly performing appearance decoration treatment on the surface of semi-cured fiberglass raw materials and using a smooth curve pressurization mode and multi-step slow pressurization steps, stress concentration and surface defects of the material during the molding process are effectively avoided, thereby significantly improving the surface quality of the product. The application of decorative layers such as UV curing paint or thermal transfer film further enhances the beauty and durability of the product.

[0017] (2) Enhanced accuracy and stability: The use of segmented pressure regulation and real-time pressure feedback system can accurately control the pressure changes during the molding process to ensure that the product has a high degree of dimensional accuracy and shape stability. This is especially important for application scenarios that require high-precision matching or specific shapes.

[0018] (3) Optimize surface flatness: The mold surface of the molding equipment is coated with a high temperature resistant anti-stick coating, which effectively prevents the decorative layer from peeling off or breaking during the molding process, thereby maintaining the flatness and smoothness of the product surface. This is crucial to improving the overall appearance and touch of the product.

[0019] (4) Reduce roughness: Through the precise pressurization steps and pressure holding control, as well as the linear decreasing mode in the pressure relief stage, the surface roughness of the product is effectively reduced to reach or exceed the standard of Ra0.8μm. This has a positive effect on reducing friction, improving wear resistance and corrosion resistance.

[0020] (5) Improve production efficiency and flexibility: The process combines advanced software and hardware technologies to achieve automated and intelligent production control, thereby improving production efficiency and product quality stability. At the same time, by adjusting the parameter settings in the software program, it can flexibly adapt to the production needs of different materials and products.

[0021] (6) Expanding application areas: Due to the excellent performance of this process in terms of surface quality, precision, flatness and roughness, it is possible for this product to be widely used in the fields of automotive interior parts, electronic equipment housings, aerospace composite parts, etc. This not only meets the market demand for high-quality and high-performance products, but also opens up new areas for the application of glass fiber composite materials.

[0022] In summary, the production process of glass fiber composite products has brought significant beneficial effects in many aspects, laying a solid foundation for the market competitiveness and application prospects of the products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they provide further detailed explanations but do not constitute a limitation of the present invention.

[0024] Figure 1 The glass fiber molding process of the present invention adopts the impact force analysis principle diagram; Figure 2 The glass fiber molding process of the present invention adopts an impact force curve diagram; Figure 3 The traditional glass fiber molding process uses an impact force curve; DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Example 1 S10: Select glass fiber semi-cured raw materials with a curing degree of 70%, and evenly apply a layer of UV curing paint on its surface for appearance decoration.

[0027] S20: Place the decorated fiberglass material in the molding equipment, which is equipped with a pressure control module and software program. The software program is set to segmented pressure regulation, smooth curve pressurization mode, and each pressurization interval is 5 seconds. Accurate pressure control is achieved through the cooperation of software and hardware.

[0028] S30: Apply pressure according to the following gradient: pressure 1 is 25% of the total pressure, pressure 2 is 45% of the total pressure, pressure 3 is 65% of the total pressure, and pressure 4 is 85% of the total pressure. The total molding pressure is set to 10MPa, and the pressure change rate is 1MPa / s. After the incremental pressure gradient is applied, the pressure holding operation is performed. The pressure in the pressure holding stage is 92% of the total pressure, the mold temperature is controlled at 135℃, and the pressure holding time lasts for 20 seconds.

[0029] S40: Ensure that the pressure change rate and the total pressure during the pressurization process are within the set range.

[0030] S50: After the pressure is maintained, the pressure is released in a linear decreasing mode with a pressure release rate of 2MPa / s. After the pressure is released, the mold opening time is delayed by 3 seconds to avoid deformation of the molded product due to rapid pressure release.

[0031] Example 2 S10: Use glass fiber semi-cured raw materials with a curing degree of 65%, and use thermal transfer film for appearance decoration.

[0032] S20: The mold surface of the molding equipment is coated with a 75μm thick polytetrafluoroethylene (PTFE) high temperature resistant anti-stick coating. The software program is set to segmented pressure regulation, smooth curve pressurization, and the interval time of each pressurization is 6 seconds.

[0033] S30: The pressure gradient is set as follows: pressurization 1 is 30% of the total pressure, pressurization 2 is 50% of the total pressure, pressurization 3 is 70% of the total pressure, and pressurization 4 is 90% of the total pressure. The total molding pressure is 15MPa, and the pressure change rate is 1.5MPa / s. The pressure in the holding stage is 95% of the total pressure, the mold temperature is controlled at 140℃, and the holding time is 25 seconds.

[0034] S40-S50: Same as Example 1.

[0035] Example 3 S10: Use glass fiber semi-cured raw materials with a curing degree of 75%, and use UV curing paint for surface decoration.

[0036] S20: The mold surface is coated with a ceramic-based composite material high-temperature resistant anti-stick coating with a thickness of 100 μm. The software program sets segmented pressure regulation, smooth curve pressurization, and the interval time of each pressurization is 8 seconds.

[0037] S30: The pressure gradient is: pressurization 1 is 20% of the total pressure, pressurization 2 is 40% of the total pressure, pressurization 3 is 60% of the total pressure, and pressurization 4 is 80% of the total pressure. The total molding pressure is 20MPa, and the pressure change rate is 2MPa / s. The pressure in the holding stage is 90% of the total pressure, the mold temperature is controlled at 120℃, and the holding time is 30 seconds.

[0038] S40-S50: Same as Example 1, but the pressure deceleration rate in the pressure release stage is adjusted to 3 MPa / s, and the mold opening time is delayed by 2 seconds.

[0039] Comparative Example 1 The same glass fiber semi-cured raw material and decorative layer as in Example 1 were used, but the smooth curve pressurization mode was not used during the molding process, but a constant pressure of 90% of the total pressure was directly applied, the pressure holding time was 20 seconds, and the other conditions were the same as in Example 1. As a result, the internal stress distribution of the product may be uneven and the surface quality may be reduced.

[0040] Comparative Example 2 The same semi-cured glass fiber raw material, decorative layer and mold coating as in Example 2 were used, but instead of adopting a multi-step slow pressurization step during the pressurization process, the total pressure was directly and rapidly pressurized, and the pressure holding time was 25 seconds. The other conditions were the same as in Example 2. This may lead to an increase in internal defects in the material, affecting the mechanical properties and appearance quality of the product.

[0041] The data of the above three groups of embodiments and two groups of comparative examples in terms of surface quality, precision difference, surface flatness and roughness were compared and analyzed, as shown in the following table: project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Surface quality excellent good middle Difference Poor Poor accuracy ±0.03mm ±0.05mm ±0.1mm ±0.2mm ±0.3mm Surface flatness high Higher medium Low Lower Roughness 0.4μm 0.8μm 1.5μm 3.0μm 4.5μm (1) Surface quality: The surface quality of Example 1 is the best, which may be due to its advanced production process and high-quality material selection.

[0042] The surface quality of Comparative Examples 1 and 2 is poor, which may be due to improper production process or poor material quality.

[0043] (2) Poor accuracy: The precision difference of Example 1 is the smallest, indicating that it has the highest processing accuracy and can meet application scenarios with high precision requirements.

[0044] The precision difference of comparative example 2 is the largest, which indicates that its processing precision is low and it may not be suitable for occasions with high precision requirements.

[0045] (3) Surface flatness: The surface flatness of Example 1 is the highest, which means that its surface is smoother and more uniform.

[0046] The surface flatness of Comparative Examples 1 and 2 is low, which may lead to problems such as uneven surface, ripples or scratches.

[0047] (4) Roughness: The roughness of Example 1 is the lowest, which is only 0.4 μm, indicating that its surface is very smooth, which is beneficial to reducing friction and improving wear resistance and corrosion resistance.

[0048] The roughness of Comparative Example 2 is the highest, reaching 4.5 μm, which may cause problems such as surface roughness, easy wear and easy corrosion.

[0049] In summary, Example 1 performs well in terms of surface quality, precision difference, surface flatness and roughness, and is a representative of high-quality products. However, Comparative Examples 1 and 2 have obvious deficiencies in these aspects, and need to improve production processes and material selection to improve product quality.

[0050] The production process of the glass fiber composite material product of the present invention brings the following beneficial effects: (1) Improve surface quality: By directly performing appearance decoration treatment on the surface of semi-cured fiberglass raw materials and using a smooth curve pressurization mode and multi-step slow pressurization steps, stress concentration and surface defects of the material during the molding process are effectively avoided, thereby significantly improving the surface quality of the product. The application of decorative layers such as UV curing paint or thermal transfer film further enhances the beauty and durability of the product.

[0051] (2) Enhanced accuracy and stability: The use of segmented pressure regulation and real-time pressure feedback system can accurately control the pressure changes during the molding process to ensure that the product has a high degree of dimensional accuracy and shape stability. This is especially important for application scenarios that require high-precision matching or specific shapes.

[0052] (3) Optimize surface flatness: The mold surface of the molding equipment is coated with a high temperature resistant anti-stick coating, which effectively prevents the decorative layer from peeling off or breaking during the molding process, thereby maintaining the flatness and smoothness of the product surface. This is crucial to improving the overall appearance and touch of the product.

[0053] (4) Reduce roughness: Through the precise pressurization steps and pressure holding control, as well as the linear decreasing mode in the pressure relief stage, the surface roughness of the product is effectively reduced to reach or exceed the standard of Ra0.8μm. This has a positive effect on reducing friction, improving wear resistance and corrosion resistance.

[0054] (5) Improve production efficiency and flexibility: The process combines advanced software and hardware technologies to achieve automated and intelligent production control, thereby improving production efficiency and product quality stability. At the same time, by adjusting the parameter settings in the software program, it can flexibly adapt to the production needs of different materials and products.

[0055] (6) Expanding application areas: Due to the excellent performance of this process in terms of surface quality, precision, flatness and roughness, it is possible for this product to be widely used in the fields of automotive interior parts, electronic equipment housings, aerospace composite parts, etc. This not only meets the market demand for high-quality and high-performance products, but also opens up new areas for the application of glass fiber composite materials.

[0056] In summary, the production process of glass fiber composite products has brought significant beneficial effects in many aspects, laying a solid foundation for the market competitiveness and application prospects of the products.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A post-decoration glass fiber molding pressure process, characterized in that: The steps include: S10: Directly perform appearance decoration treatment on the surface of semi-cured fiberglass raw materials; S20: Place the decorated fiberglass material in the molding equipment and use a smooth curve pressurization mode for structural molding; S30: completing material forming through a multi-step slow pressurization step, including applying an increasing pressure gradient from pressurization 1 to pressurization 4 in sequence, followed by pressure holding and pressure relief operations; S40: During the pressurization process, the pressure change rate is 0.5-2MPa / s, and the total molding pressure range is 5-20MPa; S50: The pressure holding stage lasts for 10-30 seconds, and the pressure release stage adopts a linear decreasing mode.

2. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The curing degree of the semi-cured glass fiber raw material in step S10 is 60-80%, and the decorative layer is a UV curing coating or a thermal transfer film.

3. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The smooth curve pressurization mode in step S20 is implemented by matching the pressure control module of the hardware device with the software program. The software program is set to segmented pressure regulation, and the interval time of each segment of pressurization is 3-8 seconds.

4. The post-decoration glass fiber molding pressure process according to claim 3, characterized in that: The software program integrates a real-time pressure feedback system to dynamically adjust the pressurization rate and holding time according to the material deformation data.

5. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The mold surface of the molding equipment in step S20 is coated with a high temperature resistant anti-stick coating with a thickness of 50-100 μm to ensure that the decorative layer is not peeled off or damaged during the molding process.

6. The post-decoration glass fiber molding pressure process according to claim 5, characterized in that: The high temperature resistant anti-stick coating is polytetrafluoroethylene (PTFE) or a ceramic-based composite material.

7. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The gradients of pressurization 1 to pressurization 4 in step S30 are: pressurization 1 is 20-30% of the total pressure, pressurization 2 is 40-50% of the total pressure, pressurization 3 is 60-70% of the total pressure, and pressurization 4 is 80-90% of the total pressure.

8. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The pressure in the pressure holding stage in step S30 is 90-95% of the total pressure, and the mold temperature is controlled at 120-150° C. during the pressure holding period.

9. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The pressure deceleration rate in the pressure relief stage in step S50 is 1-3 MPa / s, and the mold opening time is delayed by 2-5 seconds after the pressure relief is completed.

10. The post-decoration glass fiber molding pressure process according to claim 1, characterized in that: The process is applied to the preparation of automotive interior parts, electronic equipment housings or aerospace composite material parts, and the surface roughness of the product after molding is ≤Ra0.8μm.

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