Injection molding mold and injection molding method for automobile trim panel

Abstract

The invention provides an automobile trim panel injection molding mold and an injection molding method, the automobile trim panel injection molding mold comprises a fixed mold plate and a movable mold plate, the fixed mold plate and the movable mold plate are closed to form a mold cavity, and a product is subjected to injection molding in the mold cavity. The fixed mold plate is provided with a first integrated water channel, and the first integrated water channel penetrates through the fixed mold plate. The movable mold plate is provided with a second integrated water channel, and the second integrated water channel penetrates through the movable mold plate. And when the temperature of the mold rises, the first integrated water channel and the second integrated water channel are heated. And when the mold is cooled, the first integrated water channel and the second integrated water channel are cooled. The mold is rapidly cooled, the retention time of plastic in the mold is shortened, the influence of pressure in a mold cavity on the surface of a product is reduced, thermal stress is reduced, the glossiness, flatness and size precision of the product are improved, and the production efficiency is improved. And through the design of integrated water channels, the occupied space of the water channels is reduced, and the design requirements of small-size molds or multi-cavity molds are met.

Description

Technical Field

[0001] The invention belongs to the technical field of molds, and in particular relates to an automobile trim panel injection molding mold and an injection molding method. Background Art

[0002] With the development of the modern automobile industry, people expect cars to provide exquisite and beautiful visual effects. In order to improve their competitiveness, automobile manufacturers pursue high-quality automobile interior and exterior trims, and expect to produce products without melt marks, flow marks, or shrinkage marks. At the same time, they require trims to be lightweight and high-strength. High-gloss injection molding technology meets the development needs of the automobile industry. High-gloss injection molding technology is also known as rapid thermal cycle injection molding technology. This technology can well replicate any shape of the mold surface, pursue the surface of the product without melt marks, flow marks, streamlines, or shrinkage marks, has surface highlights, can achieve mirror effects, improve the strength and surface hardness of thin-walled parts, reduce the injection molding cycle of thick-walled molding, and do not require subsequent spraying processes, reduce process flows, reduce environmental pollution, and protect health. High-gloss injection molding technology requires the mold to have the ability to heat up and cool down quickly, but in the mold design process, the heating water channel and the cooling water channel of the traditional mold design need to be designed separately. The mold water channel design will occupy a large amount of mold internal space, and the cooling water channel design is limited, which is not conducive to the rapid cooling of molds with limited size or multi-cavity complex molds, affecting the mold cooling capacity. If the heating and cooling functions are integrated into a set of water circuits during the mold design process, auxiliary temperature control equipment is required, the equipment procurement cost is high, and when a failure occurs, the difficulty of maintenance increases.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides an automobile trim injection molding mold and an injection molding method, which can quickly cool the mold, reduce the residence time of the plastic in the mold, reduce the impact of the pressure in the mold cavity on the surface of the product, reduce thermal stress, improve the gloss, flatness and dimensional accuracy of the product, and improve production efficiency. By integrating the water channel design, the space occupied by the water channel is reduced to meet the design requirements of small-sized molds or multi-cavity molds.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides an automobile trim injection molding mold, including a fixed mold plate and a movable mold plate, the fixed mold plate and the movable mold plate are molded together to form a mold cavity, and the product is injection molded in the mold cavity. The fixed mold plate is provided with a first integrated water channel, and the first integrated water channel runs through the fixed mold plate. The movable mold plate is provided with a second integrated water channel, and the second integrated water channel runs through the movable mold plate. When the mold is heated, the first integrated water channel and the second integrated water channel are heated. When the mold is cooled, the first integrated water channel and the second integrated water channel are cooled. During the injection molding process, the first integrated water channel and the second integrated water channel are heated to make the mold reach a specific temperature range to reduce the condensation phenomenon when the molten plastic is injected, and during the pressure holding process, the heating temperature of the first integrated water channel and the second integrated water channel is adjusted to maintain a stable temperature of the mold to avoid temperature fluctuations. After the injection and pressure holding are completed, the first integrated water channel and the second integrated water channel are immediately cooled to quickly reduce the mold temperature, solidify the plastic, reduce thermal stress, and improve the gloss and flatness of the finished product. After cooling, the mold is opened to take out the product. The present invention reduces the residence time of the plastic in the mold by rapidly cooling the mold, reduces the impact of the pressure in the mold cavity on the surface of the product, reduces thermal stress, improves the gloss, flatness and dimensional accuracy of the product, and improves production efficiency. In addition, the integrated water channel design reduces the space occupied by the water channel, meeting the design requirements of small-sized molds or multi-cavity molds.

[0006] Furthermore, in the above-mentioned automobile trim injection molding mold, the first integrated water channel includes a first outer water channel and a first inner water channel, and the first outer water channel is arranged outside the first inner water channel. The second integrated water channel includes a second outer water channel and a second inner water channel, and the second outer water channel is arranged outside the second inner water channel. The integrated water channel is set as an outer water channel and an inner water channel, the outer water channel is connected to a cooling device, and the inner water channel is connected to a heating device. When the mold is heated, the inner water channel is heated, and the heat is transferred to the mold through the outer water channel. When the temperature of the mold is too high, the cooling device connected to the outer water channel is started to take away the excess heat. Since the inner water channel used for heating is wrapped by the outer water channel, when the flowing cooling fluid is passed into the outer water channel, the inner water channel heating source can be completely wrapped. Since the inner water channel is the heating source, the temperature of the inner water channel is the highest temperature of the mold. The outer water channel can prevent the heat of the inner water channel from overflowing. At the same time, the inner wall and the outer wall of the outer water channel take away the heat at the same time, thereby increasing the contact area between the cooling fluid and the mold, improving the heat exchange efficiency, accurately controlling the mold temperature, and realizing rapid cooling of the mold. When the external water is connected to the heating equipment and the internal water channel is connected to the cooling equipment, when the mold is heated, the external water channel is heated and the heat of the external water channel is directly transferred to the mold, thereby improving the heating efficiency of the mold.

[0007] Furthermore, in the above-mentioned automobile trim injection molding mold, the first outer water channel and the second outer water channel are both spirally arranged, the first outer water channel is spirally arranged around the outer side of the first inner water channel, and the second outer water channel is spirally arranged around the outer side of the second inner water channel. The outer water channels are both spirally arranged so that the cooling fluid flows along the spiral path, increasing the contact area and contact time between the cooling fluid and the mold, improving the heat exchange efficiency, and at the same time, the spiral water channel makes the cooling fluid flow smoothly and fluently, reducing the pressure loss of the cooling fluid and reducing the energy consumption of the equipment.

[0008] Furthermore, in the above-mentioned automobile trim injection molding mold, a first stud is provided in the first integrated water channel, and plugs are provided at both ends of the first stud. The outer side of the first stud abuts against the fixed template, and the first stud and the fixed template form a first external water channel. The first stud is provided with a first through hole along the axis, and the first through hole forms a first internal water channel. A second stud is provided in the second integrated water channel, and plugs are provided at both ends of the second stud. The outer side of the second stud abuts against the movable template, and the second stud and the movable template form a second external water channel. The second stud is provided with a second through hole along the axis, and the second through hole forms a second internal water channel. A stud is provided in the integrated water channel, and a through hole is provided in the axial direction of the stud. When the mold is heated, heat is transferred to the mold from the external thread provided on the stud, thereby improving the heating efficiency of the mold.

[0009] Furthermore, in the above-mentioned automobile trim injection molding mold, further, in the above-mentioned automobile trim injection molding mold, the first stud and the second stud are respectively set as multi-start screws. The multi-start threads provided on the first stud divide the first external water channel into multiple external water channels, and the multi-start threads provided on the second stud divide the second external water channel into multiple external water channels. The first stud and the second stud are respectively set as multi-start screws to form multiple external water channels. When the mold needs to have a rapid cooling capability, the multiple external water channels are connected to the cooling equipment, and more cooling fluid is introduced to improve the rapid cooling capability. When the mold needs to have a rapid heating capability, one or more external water channels are connected to the heating equipment, and a heating fluid is introduced to improve the heating capacity of the mold. The setting of multiple external water channels can adjust the temperature control capability of the mold as needed, thereby improving the flexibility and adaptability of the mold.

[0010] Furthermore, in the above-mentioned automobile trim injection molding mold, the cross-sections of the first stud and the second stud are set to be elliptical. The cross-sections of the first stud and the second stud are set to be elliptical, which increases the contact area between the first stud and the second stud and the mold, increases the water channel accommodation space, reduces the distance between the outer water channel and the inner water channel, and improves the heat exchange efficiency.

[0011] Furthermore, in the above-mentioned automobile trim injection molding mold, the first outer water channel and the second outer water channel are connected to the cooling water channel, and the first inner water channel and the second inner water channel are connected to the heating water channel. The outer water channel is connected to the cooling device to improve the cooling capacity of the mold, so that the plastic surface solidifies quickly, shortens the molding cycle, and improves the glossiness of the product surface.

[0012] Furthermore, in the above-mentioned automobile trim injection molding mold, heating rods are provided in the first inner water channel and the second inner water channel. The heating rod is equipped with a temperature regulating device, which can accurately set the temperature according to needs, and can be combined with the temperature control setting to adjust the heating power of the heating rod, control the temperature range of the mold, and ensure the quality of the product. In order to improve the cooling capacity of the mold, the heating rod drives the connected cylinder. When the mold needs to be cooled quickly, the cylinder drives the heating rod to separate from the mold, so that the heat source is separated from the mold. When the mold is cooled, there is no need to cool the heating rod, thereby improving the rapid cooling capacity of the mold. When the mold needs to be heated, the cylinder drives the heating rod to extend into the mold to heat the mold, so that the heating and cooling of the mold can be quickly adjusted.

[0013] Furthermore, in the above-mentioned automobile trim injection molding mold, the fixed mold plate is connected to a front fixing plate on the side away from the movable mold plate, the movable mold plate is connected to an ejector mechanism on the side away from the fixed mold plate, and the ejector mechanism is connected to a rear fixing plate on the side away from the movable mold plate.

[0014] An injection molding method, used for the above-mentioned automobile trim injection molding mold, comprises the following steps: S1: The fixed mold plate and the movable mold plate are closed, and the heating rod is inserted into the first inner water channel and the second inner water channel. The first outer water channel and the second outer water channel are connected to the cooling assembly.

[0015] S2: Start the heating rod to heat the mold.

[0016] S3: Inject plastic into the mold cavity and maintain the mold temperature during the plastic injection process.

[0017] S4: Maintain the mold pressure.

[0018] S5: Pull out the heating rod, and inject cooling liquid into the first outer water channel and the second outer water channel to quickly cool down the mold.

[0019] S6: The fixed mold plate and the movable mold plate are separated, and the ejector mechanism ejects the product.

[0020] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the automobile trim injection molding mold and injection molding method of the present invention can reduce the residence time of the plastic in the mold by rapidly cooling the mold, reduce the influence of the pressure in the mold cavity on the surface of the product, reduce thermal stress, improve the gloss, flatness and dimensional accuracy of the product, and improve production efficiency. And through the integrated water channel design, the space occupied by the water channel is reduced to meet the design requirements of small-sized molds or multi-cavity molds. The external water channels are all set to spiral shape, so that the cooling fluid flows along the spiral path, increasing the contact area and contact time between the cooling fluid and the mold, and improving the heat exchange efficiency. At the same time, the spiral water channel makes the cooling fluid flow smoothly, reduces the pressure loss of the cooling fluid, and reduces the energy consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the injection molding mold for automobile trim of the present invention; Figure 2 An exploded view of the first integrated water channel; Figure 3 An exploded view of the second integrated water channel; Figure 4 is a cross-sectional view of the first stud.

[0022] In the figure: 1, fixed template, 11, first integrated water channel, 111, first external water channel, 112, first internal water channel, 12, first stud, 122, first through hole, 2, movable template, 21, second integrated water channel, 211, second external water channel, 212, second internal water channel, 22, second stud, 222, second through hole, 4, front fixed plate, 5, ejector mechanism, 6, rear fixed plate. DETAILED DESCRIPTION

[0023] Example 1 like Figure 1 The mold for injection molding of automobile trim shown in the figure includes a fixed mold plate 1 and a movable mold plate 2. The fixed mold plate 1 and the movable mold plate 2 are molded together to form a mold cavity, and the product is injection molded in the mold cavity. The fixed mold plate 1 is provided with a first integrated water channel 11, and the first integrated water channel 11 runs through the fixed mold plate 1. The movable mold plate 2 is provided with a second integrated water channel 21, and the second integrated water channel 21 runs through the movable mold plate 2. When the mold is heated up, the first integrated water channel 11 and the second integrated water channel 21 are heated. When the mold is cooled down, the first integrated water channel 11 and the second integrated water channel 21 are cooled. The fixed mold plate 1 is connected to a front fixed plate 4 on the side away from the movable mold plate 2, and the movable mold plate 2 is connected to an ejector mechanism 5 on the side away from the fixed mold plate 1, and the ejector mechanism 5 is connected to a rear fixed plate 6 on the side away from the movable mold plate 2.

[0024] like Figure 2-3 In the injection molding mold for automobile trim shown in the figure, the first integrated water channel 11 includes a first outer water channel 111 and a first inner water channel 112, and the first outer water channel 111 is arranged outside the first inner water channel 112. The second integrated water channel 21 includes a second outer water channel 211 and a second inner water channel 212, and the second outer water channel 211 is arranged outside the second inner water channel 212. The first outer water channel 111 and the second outer water channel 211 are connected to a cooling device, and the first inner water channel 112 and the second inner water channel 212 are connected to a heating device. A heating rod is arranged inside the first inner water channel 112 and the second inner water channel 212.

[0025] When heating the mold, the heating rods in the first inner water channel 112 and the second inner water channel 212 are heated, and the heat is transferred to the mold through the first outer water channel 111 and the second outer water channel 211. When the temperature of the mold is too high, the cooling device is started to make the fluid in the first inner water channel 112 and the second inner water channel 212 flow, take away the excess heat, and accurately control the temperature of the mold. The first outer water channel 111 and the second outer water channel 211 are both set in a spiral shape, the first outer water channel 111 is spirally arranged around the outer side of the first inner water channel 112, and the second outer water channel 211 is spirally arranged around the outer side of the second inner water channel 212. A first stud 12 is provided in the first integrated water channel 11, and plugs are provided at both ends of the first stud 12. The outer side of the first stud 12 abuts against the fixed mold plate 1, and the first stud 12 and the fixed mold plate 1 form the first outer water channel 111. The first stud 12 is provided with a first through hole 122 along the axis, and the first through hole 122 forms the first inner water channel 112. A second stud 22 is provided in the second integrated water channel 21, and plugs are provided at both ends of the second stud 22. The outer side of the second stud 22 abuts against the movable template 2, and the second stud 22 and the movable template 2 form a second outer water channel 211. The second stud 22 is provided with a second through hole 222 along the axis, and the second through hole 222 forms a second inner water channel 212. The first stud 12 and the second stud 22 are respectively configured as multi-start screws. The multi-start threads provided on the first stud 12 divide the first outer water channel 111 into multiple outer water channels, and the multi-start threads provided on the second stud 22 divide the second outer water channel 211 into multiple outer water channels. The first stud 12 and the second stud 22 are respectively configured as multi-start screws to form multiple outer water channels. When the mold needs to have a rapid cooling capability, the multiple outer water channels are all connected to the cooling device. When the mold needs to have a rapid heating capability, one or more outer water channels are connected to the heating device and a heating fluid is passed through.

[0026] like Figure 4 In the injection molding mold for the automobile trim shown, the cross-sections of the first stud 12 and the second stud 22 are set to be oval.

[0027] An injection molding method, used for the above-mentioned automobile trim injection molding mold, comprises the following steps: S1: The fixed mold plate 1 and the movable mold plate 2 are molded together, and the heating rod is inserted into the first inner water channel 112 and the second inner water channel 212. The first outer water channel 111 and the second outer water channel 211 are connected to the cooling assembly.

[0028] S2: Start the heating rod to heat the mold.

[0029] S3: Inject plastic into the mold cavity and maintain the mold temperature during the plastic injection process.

[0030] S4: Maintain the mold pressure.

[0031] S5: Pull out the heating rod, and inject cooling liquid into the first outer water channel 111 and the second outer water channel 211 to quickly cool down the mold.

[0032] S6: The fixed mold plate 1 and the movable mold plate 2 are separated, and the ejector mechanism 5 ejects the product.

[0033] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding mold for automobile trim, characterized in that: The invention comprises a fixed mold plate (1) and a movable mold plate (2), wherein the fixed mold plate (1) and the movable mold plate (2) are combined to form a mold cavity, and a product is injection molded in the mold cavity; the fixed mold plate (1) is provided with a first integrated water channel (11), the first integrated water channel (11) runs through the fixed mold plate (1), and the first integrated water channel (11) is arranged in an array along the long side of the fixed mold plate (1); the movable mold plate (2) is provided with a second integrated water channel (21), the second integrated water channel (21) runs through the movable mold plate (2), and the second integrated water channel (21) is arranged in an array along the long side of the movable mold plate (2); when the mold needs to be heated, the first integrated water channel (11) and the second integrated water channel (21) are heated; when the mold needs to be cooled, the first integrated water channel (11) and the second integrated water channel (21) are cooled.

2. The automobile trim injection molding die according to claim 1, characterized in that: The first integrated water channel (11) comprises a first outer water channel (111) and a first inner water channel (112), the first outer water channel (111) being arranged outside the first inner water channel (112); the second integrated water channel (21) comprises a second outer water channel (211) and a second inner water channel (212), the second outer water channel (211) being arranged outside the second inner water channel (212).

3. The automobile trim injection molding die according to claim 2, characterized in that: The first outer water channel (111) and the second outer water channel (211) are both arranged in a spiral shape; the first outer water channel (111) is arranged in a spiral around the outer side of the first inner water channel (112), and the second outer water channel (211) is arranged in a spiral around the outer side of the second inner water channel (212).

4. The automobile trim injection molding die according to claim 2, characterized in that: A first stud (12) is provided in the first integrated water channel (11), and plugs are provided at both ends of the first stud (12); the outer side of the first stud (12) abuts against the fixed template (1), and the first stud (12) and the fixed template (1) form a first outer water channel (111); the first stud (12) is provided with a first through hole (122) along the axis, and the first through hole (122) forms a first inner water channel (112); a second stud (22) is provided in the second integrated water channel (21), and plugs are provided at both ends of the second stud (22); the outer side of the second stud (22) abuts against the movable template (2), and the second stud (22) and the movable template (2) form a second outer water channel (211); the second stud (22) is provided with a second through hole (222) along the axis, and the second through hole (222) forms a second inner water channel (212).

5. The automobile trim injection molding die according to claim 4, characterized in that: The first stud (12) and the second stud (22) are respectively configured as multi-start screws; the multi-start threads provided on the first stud (12) divide the first external water channel (111) into a plurality of external water channels, and the multi-start threads provided on the second stud (22) divide the second external water channel (211) into a plurality of external water channels.

6. The automobile trim injection molding die according to claim 5, characterized in that: The cross-sections of the first stud (12) and the second stud (22) are set to be elliptical.

7. The automobile trim injection molding die according to claim 2, characterized in that: The first external water channel (111) and the second external water channel (211) are connected to cooling equipment, and the first internal water channel (112) and the second internal water channel (212) are connected to heating equipment.

8. The automobile trim injection molding die according to claim 2, characterized in that: Heating rods are provided in the first inner water channel (112) and the second inner water channel (212).

9. The automobile trim injection molding die according to claim 1, characterized in that: The fixed die plate (1) is connected to a front fixing plate (4) on the side away from the movable die plate (2), the front fixing plate (4) is connected to a fixing ring (3), the movable die plate (2) is connected to an ejector mechanism (5) on the side away from the fixed die plate (1), and the ejector mechanism (5) is connected to a rear fixing plate (6) on the side away from the movable die plate (2).

10. An injection molding method, used for the automobile trim injection molding mold according to any one of claims 1 to 9, characterized in that: The steps include: S1: the fixed mold plate (1) and the movable mold plate (2) are molded together, and a heating rod is inserted into the first inner water channel (112) and the second inner water channel (212); the first outer water channel (111) and the second outer water channel (211) are connected to a cooling component; S2: Start the heating rod to heat the mold; S3: Inject plastic into the mold cavity and maintain the mold temperature during the plastic injection process; S4: Maintaining the mold pressure; S5: pulling out the heating rod, injecting cooling liquid into the first outer water channel (111) and the second outer water channel (211), and rapidly cooling the mold; S6: The fixed mold plate (1) and the movable mold plate (2) are separated, and the ejector mechanism (5) ejects the product.

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