Injection molded part, mold and household appliance

Abstract

The embodiments of the present application provide an injection molded part, a mold, and a household appliance. The injection molded part includes an appearance plate and a connecting plate. The surface of the appearance plate along one side in the thickness direction is an appearance surface, and the surface of the connecting plate is a non-appearance surface. The connecting plate is connected to the appearance plate. A gate forming portion is provided at one end of the connecting plate near the appearance plate. The gate forming portion is suitable for corresponding to the gate of the mold. One end of the gate forming portion is connected to the appearance plate. A material blocking portion is provided around the remaining portion of the gate forming portion. The thickness of the material blocking portion is less than the thickness of the gate forming portion and less than the thickness of the connection portion between the appearance plate and the gate forming portion. The material blocking cavity can ensure a small time difference between the melt filling the appearance plate cavity and the melt filling the connecting plate cavity, thereby reducing the possibility of the melt in the connecting plate cavity continuously impacting the solidified layer in the appearance plate cavity, reducing or avoiding the probability of flow marks on the appearance surface of the appearance plate formed by the appearance plate cavity, and improving the yield of the injection molded part.

Description

Technical Field

[0001] The present application relates to the field of injection molding technology, and in particular to an injection molded part, a mold, and a household appliance. Background Art

[0002] In the related art, flow defects are prone to appear on the exterior surface of injection molded parts. When the flow defects are more obvious, they will affect the appearance of the product. Therefore, the flow defects on the exterior surface of the injection molded parts will be strictly controlled, resulting in a low pass rate of injection molded parts, a high scrap rate, and high manufacturing costs. Summary of the Invention

[0003] In view of this, the embodiments of the present application hope to provide an injection molded part, a mold, and a household appliance that reduce flow defects on the exterior surface of the injection molded part and improve the qualified rate of the injection molded part.

[0004] The present invention provides an injection molded part, comprising:

[0005] Appearance plate, the surface of the appearance plate along one side of the thickness direction is the appearance surface,

[0006] A connecting plate, the surface of the connecting plate is a non-appearance surface, the connecting plate is connected to the appearance plate, a gate forming portion is provided at one end of the connecting plate close to the appearance plate, the gate forming portion is suitable for corresponding to the gate of the mold, one end of the gate forming portion is connected to the appearance plate, and a material blocking portion is provided around the remaining portion of the gate forming portion, the thickness of the material blocking portion is less than the thickness of the gate forming portion, and less than the thickness of the connection portion between the appearance plate and the gate forming portion.

[0007] In some embodiments, the material blocking portion is continuously provided around the periphery except for a connection portion between the gate forming portion and the appearance plate.

[0008] In some embodiments, the thickness of the end of the appearance plate close to the connecting plate is greater than the thickness of the end of the connecting plate close to the appearance plate.

[0009] In some embodiments, the absolute value of the thickness difference of the portion of the appearance plate connected to the gate forming portion does not exceed 1 mm.

[0010] In some embodiments, there are multiple material blocking portions, and the multiple material blocking portions are spaced apart in a direction away from the gate forming portion.

[0011] In some embodiments, the width of the material blocking portion in a direction away from the gate forming portion is 5 mm to 15 mm.

[0012] In some embodiments, the thickness of the material blocking portion is 0.3 mm to 1.8 mm; and / or the thickness of the appearance plate is 2.5 mm to 3.5 mm; and / or the thickness of the connecting plate is 1.5 mm to 2.5 mm; and / or the thickness of the gate forming portion is 1.5 to 4 mm.

[0013] In some embodiments, the appearance plate and the connecting plate are both annular, the appearance plate surrounds the connecting plate, and there are multiple gate forming parts, which are arranged at intervals along the circumference of the connecting plate.

[0014] In some embodiments, the injection-molded part is a spray-free injection-molded part, and the spray-free injection-molded part comprises a resin matrix and metal particles distributed in the resin matrix.

[0015] An embodiment of the present application provides a household appliance, comprising the injection-molded part described in any embodiment of the present application.

[0016] An embodiment of the present application provides a mold for molding injection molded parts, the mold having a cavity and a gate, the cavity comprising a gate cavity for molding a gate forming part, a material blocking cavity for molding a material blocking part, an appearance plate cavity for molding an appearance plate, and a connecting plate cavity for molding a connecting plate, the appearance plate cavity and the connecting plate cavity are connected, the wall surface of the appearance plate cavity on one side along the thickness direction is used to mold the appearance surface of the appearance plate, the gate is arranged on one side of the gate cavity along the thickness direction, one end of the gate cavity is connected to the appearance plate cavity, and a material blocking cavity is arranged around the rest of the gate cavity, the thickness of the material blocking cavity is less than the thickness of the gate cavity, and less than the thickness of the connecting part between the appearance plate cavity and the gate cavity.

[0017] In some embodiments, the resist cavity is continuously provided around the periphery except for the connection portion between the gate cavity and the appearance plate cavity.

[0018] In some embodiments, there are multiple barrier cavities, which are spaced apart in a direction away from the gate cavity so that the melt for injection molding flows from the gate cavity through each of the barrier cavities in sequence and then flows to the connecting plate cavity.

[0019] In some embodiments, a thickness of the appearance plate cavity at one end close to the connection plate cavity is greater than a thickness of the connection plate cavity at one end close to the appearance plate cavity.

[0020] In some embodiments, the width of the resist cavity from the direction close to the gate cavity to the direction away from the gate cavity is 5 mm to 15 mm.

[0021] In some embodiments, the thickness of the resist cavity is 0.3 mm to 1.8 mm; and / or the thickness of the appearance plate cavity is 2.5 mm to 3.5 mm; and / or the thickness of the connecting plate cavity is 1.5 mm to 2.5 mm; and / or the thickness of the gate cavity is 1.5 to 4 mm.

[0022] In the embodiment of the present application, during pouring, the melt enters the gate cavity from the gate, and a portion of the melt flows directly from the gate cavity to the appearance plate cavity, while the other portion of the melt flows directly from the gate cavity to the barrier cavity, and then flows from the barrier cavity to the connecting plate cavity. Since the thickness of the barrier cavity is smaller than the thickness of the gate cavity, and smaller than the thickness of the connection portion between the appearance plate cavity and the gate cavity, the resistance of the melt flowing from the gate cavity to the appearance plate cavity is smaller than the resistance to flowing to the barrier cavity, and the speed and flow rate of the melt flowing to the appearance plate cavity are greater than the speed and flow rate of the melt flowing to the barrier cavity. In other words, due to the thinning design of the barrier cavity, a certain flow blocking effect is exerted on the melt, reducing the speed and flow rate of the melt flowing to the connecting plate cavity.

[0023] It should be noted that since the barrier cavity does not completely block the flow path between the gate cavity and the connecting plate cavity, when the melt flows to the appearance plate cavity, the melt will also flow to the connecting plate cavity through the barrier cavity at the same time, but the flow rate and flow rate are smaller than those in the appearance plate cavity.

[0024] The design of the barrier cavity enables the appearance plate cavity to be quickly filled with melt. There is a small time difference between the melt filling the appearance plate cavity and the melt filling the connecting plate cavity. At the junction of the appearance plate cavity and the connecting plate cavity, the melt tends to flow from the appearance plate cavity to the connecting plate cavity, and the probability of the melt in the connecting plate cavity flowing to the appearance plate cavity is small. In this way, the possibility of the melt in the connecting plate cavity continuously impacting the solidified layer in the appearance plate cavity is reduced, the probability of flow marks on the appearance surface of the appearance plate formed by the appearance plate cavity is reduced or avoided, and the yield of injection molded parts is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an injection molded part according to an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic diagram of another perspective of the structure shown;

[0027] Figure 3 This is a schematic structural diagram of an injection molded part according to another embodiment of the present application;

[0028] Figure 4 for Figure 3 A schematic diagram of another perspective of the structure shown;

[0029] Figure 5 for Figure 4 A partial cross-sectional view of the structure shown;

[0030] Figure 6 for Figure 4 Another partial cross-sectional view of the structure shown;

[0031] Figure 7 for Figure 3 A schematic diagram of the structure shown in another perspective;

[0032] Figure 8 for Figure 7 A partial cross-sectional view of the structure shown.

[0033] Description of Reference Numerals

[0034] 1- appearance board; 11- appearance surface;

[0035] 2-connecting plate; 21-gate forming portion; 22-material blocking portion;

[0036] 3-inner ring plate; 4-longitudinal ring plate;

[0037] 100-door ring; 200-control panel DETAILED DESCRIPTION

[0038] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] In the description of the embodiments of the present application, it should be noted that the terms "thickness," "length," "width," and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are intended only to facilitate the description of the embodiments of the present application and to simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] It should be noted that mm in this application refers to the international unit millimeter. The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] In order to improve the visual appearance of the product, the appearance of some plastic parts of the product usually needs to have a gorgeous metallic appearance effect. In order to enable the plastic parts to have a gorgeous metallic appearance effect, in the relevant technology, the manufacturing process of plastic parts is mostly an injection molding + spraying process, that is, metal powder is sprayed on the outer surface of the injection-molded injection-molded blank. The plastic parts after spraying have a gorgeous metallic appearance effect. However, the spraying process has disadvantages such as high pollution, high cost, low pass rate and cannot be recycled after scrapping.

[0042] In order to solve the shortcomings of the spraying process, spray-free thermoplastic engineering plastics came into being. The use of spray-free injection molding can give the product a metallic appearance, thereby eliminating the spraying process and avoiding the emission of pollutants during the spraying process. However, flow marks are prone to occur in both the spraying injection molding process and the spray-free injection molding process. Since the melt of the spray-free thermoplastic engineering plastic contains metal powder, during the injection molding process, the melt is likely to cause uneven distribution of metal powder during the flow of the melt in the mold cavity. The produced spray-free injection molded products show uneven light scattering under the irradiation of light, and some parts are darker in color, visually forming flow marks, causing the product to have flow mark defects, making the appearance quality of the spray-free injection molded parts fail to meet the product appearance requirements, resulting in low yield, material waste, and high production costs. Therefore, it is difficult for existing plastic parts with high-quality appearance requirements to adopt the spray-free injection molding process.

[0043] An embodiment of the present application provides an injection-molded part, which is an injection-molded part that is formed by integral injection molding, for example, a spray-free integral injection-molded part. For example, the injection-molded part of the embodiment of the present application is formed by injection molding a melt composed of a matrix containing metal powder. In other words, the material of the injection-molded part includes a matrix and metal powder distributed in the matrix. The injection-molded part formed using a matrix containing metal powder has a metallic appearance and does not require additional spraying of a metal coating, that is, the plastic part is a spray-free plastic part.

[0044] For ease of description, the following description will be made by taking the injection molding of a melt composed of a matrix containing metal powder into an injection molded part as an example.

[0045] The type of metal powder is not limited. For example, the metal powder includes but is not limited to copper, silver and / or aluminum, etc.

[0046] Metal powder refers to the metal in the form of particles. In this application, the size of the particles is not limited.

[0047] The type of the matrix is ​​not limited. For example, the matrix includes but is not limited to resin and the like.

[0048] The application fields of injection molded parts are not limited. For example, in the embodiments of this application, the application of injection molded parts in household appliances is described as an example. Among them, the household appliances can be refrigerators, clothes processing equipment, etc.

[0049] Clothes processing equipment can be a washing machine, a dryer, a washer-dryer, etc.

[0050] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The injection molded part includes an appearance plate 1 and a connecting plate 2, and the connecting plate 2 is connected to the appearance plate 1.

[0051] The surface of the connecting plate 2 is a non-exterior surface, that is, the surface of the connecting plate 2 will not be exposed on the outer surface of the household appliance, and the user cannot see the connecting plate 2.

[0052] The specific shape of the connecting plate 2 is not limited, and can be roughly flat or bent.

[0053] A surface on one side of the appearance plate 1 along the thickness direction is an appearance surface 11 , and the appearance surface 11 can be directly seen.

[0054] It should be noted that the specific shape of the appearance plate 1 is not limited. The appearance plate 1 can be a generally flat plate with only one surface being the appearance surface 11 , or a bent plate with at least two surfaces being the appearance surfaces 11 .

[0055] A gate-forming portion 21 is provided at one end of the connecting plate 2, near the exterior plate 1. This portion is adapted to correspond to the mold's gate. Specifically, the gate-forming portion 21 is positioned adjacent to the exterior plate 1. It is positioned as close to the exterior plate 1 as possible, provided that the gate-forming portion 21 does not interfere with the exterior surface 11 of the exterior plate 1 and satisfies mold design and casting requirements.

[0056] One end of the gate forming portion 21 is connected to the appearance plate 1, and a material blocking portion 22 is arranged around the rest of the gate forming portion 21. The thickness of the material blocking portion 22 is smaller than the thickness of the gate forming portion 21, and smaller than the thickness of the connection portion between the appearance plate 1 and the gate forming portion 21. That is to say, there is no thinning treatment on the side where the gate forming portion 21 is connected to the appearance plate 1, and thinning treatment is performed on the rest of the surrounding portions of the gate forming portion 21.

[0057] Since the material blocking portion 22 is thinned, visually speaking, the material blocking portion 22 may form a groove structure on one side of the injection molded part along the thickness direction, or may form a groove structure on both sides of the injection molded part along the thickness direction.

[0058] In order to clearly illustrate the injection-molded parts provided in the embodiments of the present application, the mold provided in the embodiments of the present application is first described. The mold is used to injection-mold the injection-molded parts in the embodiments of the present application.

[0059] The present invention provides a mold having a cavity and a gate. During injection molding, the melt enters the cavity from the gate and fills the cavity. After the mold is formed and cooled, the mold is opened to obtain an injection molded part.

[0060] The mold cavity includes a gate mold cavity for molding the gate forming portion 21 , a material blocking mold cavity for molding the material blocking portion 22 , an appearance plate mold cavity for molding the appearance plate 1 , and a connection plate mold cavity for molding the connection plate 2 .

[0061] The appearance plate cavity and the connecting plate cavity are connected, and the wall surface of the appearance plate cavity on one side along the thickness direction is used to form the appearance surface 11 of the appearance plate 1. The gate is arranged on one side of the gate cavity along the thickness direction. One end of the gate cavity is connected with the appearance plate cavity, and a material blocking cavity is arranged around the rest of the gate cavity. That is to say, the material blocking cavity is located on the flow path of the melt flowing from the gate cavity to the connecting plate cavity. The melt first flows through the material blocking cavity and then flows to the connecting plate cavity.

[0062] The thickness of the barrier cavity is smaller than that of the gate cavity, and also smaller than the thickness of the connection between the exterior plate cavity and the gate cavity. In other words, the gate cavity is designed to be thinner around the side facing the exterior plate cavity.

[0063] The specific analysis of the causes of flow marks on injection molded parts is as follows:

[0064] After the hotter melt enters the mold through the gate, it comes into contact with the cooler cavity walls during its flow, where it quickly freezes, forming a thin solidified layer. The flow direction of the metal powder in this solidified layer determines the appearance of the injection molded part. Stable metal powder flow creates a consistent metal powder orientation, resulting in a better appearance. If the melt from the non-appearance cavity continuously impacts the appearance cavity during its flow, the orientation of the metal powder in the solidified layer of the appearance cavity will become disordered, leading to noticeable flow marks.

[0065] It should be noted that the non-appearance cavity refers to a cavity used to form a structure with a non-appearance surface, such as the aforementioned connection plate cavity. The appearance cavity refers to a cavity used to form a structure with an appearance surface 11, such as the aforementioned appearance plate cavity.

[0066] The principle of reducing flow marks in the embodiment of the present application is described in detail as follows.

[0067] It should be noted that when the melt is injected into the mold, it contacts the cooler cavity wall of the cavity, the temperature drops, and a solidified layer is produced on the cavity wall. The flow area of ​​the cavity decreases with the increase of the thickness of the solidified layer, and the fluidity is proportional to the cube of the thickness. Therefore, the greater the thickness of the cavity, the smaller the flow resistance, the better the fluidity, and the faster the flow rate.

[0068] In the embodiment of the present application, during pouring, the melt enters the gate cavity from the gate, and a portion of the melt flows directly from the gate cavity to the appearance plate cavity, while the other portion of the melt flows directly from the gate cavity to the barrier cavity, and then flows from the barrier cavity to the connecting plate cavity. Since the thickness of the barrier cavity is smaller than the thickness of the gate cavity, and smaller than the thickness of the connection portion between the appearance plate cavity and the gate cavity, the resistance of the melt flowing from the gate cavity to the appearance plate cavity is smaller than the resistance to flowing to the barrier cavity, and the speed and flow rate of the melt flowing to the appearance plate cavity are greater than the speed and flow rate of the melt flowing to the barrier cavity. In other words, due to the thinning design of the barrier cavity, a certain flow blocking effect is exerted on the melt, reducing the speed and flow rate of the melt flowing to the connecting plate cavity.

[0069] It should be noted that since the barrier cavity does not completely block the flow path between the gate cavity and the connecting plate cavity, when the melt flows to the appearance plate cavity, the melt will also flow to the connecting plate cavity through the barrier cavity at the same time, but the flow rate and flow rate are smaller than those in the appearance plate cavity.

[0070] The design of the resistance material cavity enables the appearance plate cavity to be quickly filled with melt. There is a small time difference between the melt filling the appearance plate cavity and filling the connecting plate cavity. At the junction of the appearance plate cavity and the connecting plate cavity, the melt tends to flow from the appearance plate cavity to the connecting plate cavity, and the probability of the melt in the connecting plate cavity flowing to the appearance plate cavity is small. In this way, the possibility of the melt in the connecting plate cavity continuously impacting the solidified layer in the appearance plate cavity is reduced, and the probability of flow marks appearing on the appearance surface 11 of the appearance plate 1 formed by the appearance plate cavity is reduced or avoided, thereby improving the yield of injection molded parts.

[0071] The material blocking portion 22 generally extends along the periphery of the gate forming portion 21 . It is understandable that the material blocking portion 22 may be completely continuous along the extending direction, or may be discontinuous and interrupted in a narrower local area.

[0072] Exemplarily, the material blocking portion 22 is continuously provided around the periphery except for the connection portion between the gate forming portion 21 and the appearance plate 1 , so as to achieve a better material blocking effect.

[0073] The shape of the material blocking portion 22 is not limited. For example, in some embodiments, refer to Figure 1 and Figure 2 The material blocking portion 22 is generally U-shaped, with the opening side of the U-shaped portion facing the side where the appearance plate 1 is located. Figure 1 、 Figure 2 、 Figure 3 The material blocking portion 22 is generally formed by connecting a plurality of linear structures in sequence.

[0074] The width of the material blocking portion 22 along the melt flow direction is not limited as long as the structural strength is ensured.

[0075] The number of the material blocking portions 22 is not limited. It should be noted that the number of the material blocking portions 22 herein refers to a single gate forming portion 21 , that is, the number of the material blocking portions 22 corresponding to each gate forming portion 21 is not limited.

[0076] For example, in some embodiments, see Figure 3 and Figure 4 , the number of the material blocking portion 22 is one.

[0077] For example, see Figure 1 and Figure 2 , there are multiple material blocking parts 22, and multiple material blocking parts 22 are spaced apart in a direction away from the gate forming part 21, and the material blocking parts 22 farther away from the gate forming part 21 surround the material blocking parts 22 closer to the gate forming part 21. For the mold, there are multiple material blocking cavities, and multiple material blocking cavities are spaced apart in a direction away from the gate cavity, so that the melt used for injection molding flows from the gate cavity through each material blocking cavity in sequence and then flows to the connecting plate cavity. During the pouring process, the melt will flow through multiple material blocking cavities in sequence before flowing to the connecting plate cavity, and each material blocking cavity will form a flow blockage for the melt. Multiple material blocking cavities can form a more obvious flow blockage effect on the melt, so that the melt can more reliably fill the appearance plate cavity first and then fill the connecting plate cavity.

[0078] Exemplarily, the thickness of the end of the appearance plate 1 close to the connecting plate 2 is greater than the thickness of the end of the connecting plate 2 close to the appearance plate 1 .

[0079] For the mold, the thickness of one end of the appearance plate cavity close to the connection plate cavity is greater than the thickness of the one end of the connection plate cavity close to the appearance plate cavity.

[0080] At the junction of the connecting plate cavity and the appearance plate cavity, since the thickness of the connecting plate cavity is smaller, it also has a certain flow blocking effect, reducing the probability of the melt in the connecting plate cavity flowing to the appearance plate cavity, and reducing the possibility of the melt in the connecting plate cavity impacting the appearance surface 11 of the appearance plate cavity, making it easier to form a stable flow field during the formation of the appearance plate, reducing the probability of flow marks, and improving the yield of injection molded parts.

[0081] It should be noted that since the flow rate of the melt in the appearance plate cavity is greater than the flow rate in the connecting plate cavity, the melt in the appearance plate cavity is prone to curl and flip toward one side of the connecting plate cavity at the junction of the appearance plate cavity and the connecting plate cavity. However, since the component molded by the connecting plate cavity is the connecting plate 2, the surface of the connecting plate 2 is a non-appearance surface, even if defects such as marks occur, it will not affect the appearance of the injection molded part. Therefore, the connecting plate 2 does not require defects, and some possible defects and some unavoidable defects can be placed on the connecting plate 2.

[0082] Exemplarily, the gate forming portion 21 is designed to be substantially of equal thickness, that is, the thickness of each portion of the gate forming portion 21 is substantially equal.

[0083] For example, the absolute value of the difference between the thickness of the portion of the appearance plate 1 connected to the gate forming portion 21 and the thickness of the gate forming portion 21 does not exceed 1 mm. In other words, the thickness of the portion of the appearance plate 1 connected to the gate forming portion 21 can be greater than or equal to the thickness of the gate forming portion 21, or the thickness of the portion of the appearance plate 1 connected to the gate forming portion 21 can be less than the thickness of the gate forming portion 21.

[0084] For example, see Figure 8 The width H of the material blocking portion 22 in the direction away from the gate forming portion 21 is 5 mm to 15 mm, for example, 5 mm, 5.5 mm, 6 mm, 6.3 mm, 7 mm, 7.6 mm, 8 mm, 9 mm, 10 mm, 10.4 mm, 11 mm, 12 mm, 12.7 mm, 13 mm, 14 mm, 15 mm, etc. In other words, the length of the flow path of the melt in the material blocking portion 22 is not less than the above-mentioned width of the material blocking portion 22.

[0085] For the mold, the width of the resist cavity from the direction close to the gate cavity to the direction away from the gate cavity is 5mm to 15mm, for example, 5mm, 5.5mm, 6mm, 6.3mm, 7mm, 7.6mm, 8mm, 9mm, 10mm, 10.4mm, 11mm, 12mm, 12.7mm, 13mm, 14mm, 15mm, etc.

[0086] This width range enables the material blocking cavity to have a good flow blocking effect during the pouring process, while also ensuring that the thinning process of the material blocking portion 22 does not significantly affect the structural strength.

[0087] It should be noted that if the width of the material blocking portion 22 is too large, the material blocking portion 22 may affect the overall structural strength of the injection molded part due to its large size due to the thinning treatment. If the size of the material blocking portion 22 is too narrow, the flow blocking effect is not ideal. Therefore, the embodiment of the present application controls the width of the material blocking portion 22 within the above range, which can meet the effects of flow blocking and the overall structural strength of the injection molded part.

[0088] Illustratively, the thickness of the material blocking portion 22 is 0.3 mm to 1.8 mm, for example, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, etc.

[0089] For the mold, the thickness of the resist cavity is 0.3mm to 1.8mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc.

[0090] In this embodiment, the thickness range of the material blocking portion 22 and the material blocking cavity can better control the melt to have a suitable flow rate and flow rate when flowing through the material blocking cavity.

[0091] Illustratively, the thickness of the appearance plate 1 is 2.5 mm to 3.5 mm, for example, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0092] For the mold, the thickness of the appearance plate cavity is 2.5mm to 3.5mm, for example, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, etc.

[0093] In this embodiment, the thickness range of the appearance plate 1 and the appearance cavity can ensure that the melt has a good flow rate in the appearance cavity, and can also make the appearance plate 1 take into account both structural strength and material cost.

[0094] It should be noted that the appearance plate 1 can be designed with uniform thickness or with unequal thickness, which is not limited here.

[0095] Exemplarily, the thickness of the connecting plate 2 is 1.5 mm to 2.5 mm, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0096] For the mold, the thickness of the connecting plate cavity is 1.5mm to 2.5mm, for example, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0097] Under the condition that the thickness of the connecting plate 2 is smaller than that of the appearance plate 1 , the connecting plate 2 has an appropriate thickness range, thereby ensuring the structural strength and material cost of the connecting plate 2 .

[0098] Illustratively, the gate forming portion 21 has a thickness of 1.5 mm to 4 mm, for example, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.7 mm, 3 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc.

[0099] For the mold, the thickness of the gate cavity is 1.5 to 4 mm, for example, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.7 mm, 3 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc.

[0100] In this embodiment, the thickness range of the gate forming portion 21 and the gate cavity facilitates the melt to flow to the periphery of the gate cavity with a large flow rate in the gate cavity, thereby improving the injection molding efficiency.

[0101] It should be noted that the above-mentioned thickness value range needs to be determined on the premise of satisfying the relative thickness relationship.

[0102] For example, if the thickness of the material blocking portion 22 is smaller than that of the gate forming portion 21, and the thickness of the material blocking portion 22 is 1.8 mm, the thickness of the gate forming portion 21 needs to be within a range greater than 1.8 mm and not exceeding 4 mm. If the thickness of the material blocking portion 22 is 0.3 mm, the thickness of the gate forming portion 21 can be any value within a range of 1.5 mm to 4 mm.

[0103] For example, in some embodiments, the injection molded part is a control panel 200 of a clothing processing device, and the control panel 200 is generally in the shape of a long strip, with the appearance panel 1 and the connection panel 2 arranged generally along the length direction.

[0104] In other embodiments, the injection molded part is a door ring 100 of a clothing processing device, and the door ring 100 is generally in a circular shape.

[0105] Two embodiments of the injection molded parts are described below with reference to the accompanying drawings.

[0106] First embodiment

[0107] See also Figure 1 and Figure 2 The injection molded part is generally in the shape of a long strip, for example, a control panel 200 of a clothing processing device.

[0108] There are two material blocks 22, one of which is roughly U-shaped, with its opening facing the exterior panel 1. The other is constructed from multiple linear structures. Each material block 22 is relatively narrow, increasing the number of cavities to enhance the flow blocking effect. For example, the width of each material block 22 is approximately 1 mm to 3 mm.

[0109] Second embodiment

[0110] See also Figures 3 to 8 The appearance plate 1 and the connecting plate 2 are both annular, the appearance plate 1 surrounds the connecting plate 2, and the appearance plate 1 and the connecting plate 2 are directly connected together except for the gate forming portion 21. For example, the injection molded part is a door ring 100 of a clothes processing device.

[0111] Accordingly, both the exterior plate cavity and the connecting plate cavity are annular, with the exterior plate cavity surrounding the connecting plate cavity. The gate cavity's radially outward end is connected to the exterior plate cavity. During injection molding, the melt flows radially outward from the gate cavity into the exterior plate cavity, then flows roughly circumferentially within the exterior plate cavity.

[0112] The number of the gate forming portion 21 can be one or more. Accordingly, the number of the gate of the mold can be one or more.

[0113] Exemplarily, there are multiple gate forming parts 21 , and the multiple gate forming parts 21 are arranged at intervals along the circumferential direction of the connecting plate 2 .

[0114] For example, multiple gates are opened sequentially along the circumference at preset time intervals. That is, the multiple gates do not open simultaneously to inject glue, but rather in a sequential order. On the one hand, using multiple gates prevents a single gate from rapidly filling the mold cavity. On the other hand, opening multiple gates sequentially at preset time intervals ensures unidirectional melt flow, forming a continuous leading flow front and reducing the likelihood of an unstable flow field.

[0115] It should be noted that the specific duration of the preset time interval can be set according to actual production needs and is not limited in this application.

[0116] For example, see Figure 3 and Figure 4 The injection molded part includes an inner ring plate 3, a connecting plate 2 is arranged around the inner ring plate 3, and a gate forming portion 21 and the inner ring plate 3 are connected by a material blocking portion 22. In other words, the gate forming portion 21 is not directly connected to the inner ring plate 3.

[0117] The mold cavity includes an inner ring plate cavity, which is used to form the inner ring plate 3. The connecting plate cavity surrounds the inner ring plate cavity, and the gate cavity and the inner ring plate cavity are connected via a material blocking cavity. Specifically, the gate cavity is connected to the connecting plate cavity on two opposite sides along the circumferential direction, connected to the exterior plate cavity on the radial outer side, and connected to the inner ring plate cavity on the radial inner side.

[0118] During the injection molding process, the melt flows from the gate cavity to the barrier cavity, and then from the barrier cavity to the inner ring plate cavity.

[0119] For example, the thickness of the inner ring plate 3 is greater than the thickness of the connecting plate 2. Figure 5 and Figure 6 The thickness of the portion 22b of the material blocking portion 22 connecting the inner ring plate 3 and the gate forming portion 21 is not less than the thickness of the portion 22a of the material blocking portion 22 connecting the gate forming portion 21 and the connecting plate 2. The surface of one side of the connecting plate 2 along the thickness direction is the secondary appearance surface.

[0120] It is understood that the aforementioned appearance panel 1 is the primary appearance panel, and the appearance surface 11 of the appearance panel 1 is the primary appearance surface 11, which is a very important appearance surface 11 of the product and can be touched and seen by the user. The inner ring panel 3 is the secondary appearance panel, and the secondary appearance surface of the inner ring panel 3 is also an appearance surface 11 that can be seen by the user, but its importance is lower than the primary appearance surface 11. For example, a light-transmitting panel is provided on the outer side of the secondary appearance surface of the inner ring panel 3, so the user can see the secondary appearance surface of the inner ring panel 3 but cannot touch it.

[0121] For the mold, the thickness of the portion where the blocking cavity connects between the inner ring plate cavity and the gate cavity is not less than the thickness of the portion where the blocking cavity connects between the gate cavity and the connecting plate cavity.

[0122] In this embodiment, the speed and flow rate of the melt flowing from the resistance material cavity to the inner ring plate cavity will not be less than the flow rate and speed flowing to the connecting plate cavity. In addition, the thickness of the inner ring plate cavity is greater than the thickness of the connecting plate cavity. Therefore, the flow speed of the melt in the inner ring plate cavity is greater than the flow speed in the connecting plate cavity. There is a small time difference between the melt filling the inner ring plate cavity and filling the connecting plate cavity. At the junction of the appearance plate cavity and the connecting plate cavity, the melt tends to flow from the appearance plate cavity to the connecting plate cavity, and the probability of the melt in the connecting plate cavity flowing to the appearance plate cavity is small. In this way, the possibility of the melt in the connecting plate cavity continuously impacting the solidified layer in the appearance plate cavity is reduced, the probability of flow marks appearing on the appearance surface 11 of the appearance plate 1 formed by the appearance plate cavity is reduced or avoided, and the yield of injection molded parts is improved.

[0123] For example, the thickness of the portion where the blocking cavity connects between the inner ring plate cavity and the gate cavity is 0.1 mm to 0.2 mm thicker than the thickness of the portion where the blocking cavity connects between the gate cavity and the connecting plate cavity.

[0124] For example, see Figure 3 The injection molded part includes a longitudinal ring plate 4, which extends from the radial inner end of the inner ring plate 3 along the thickness direction of the inner ring plate 3 to the side away from the secondary appearance surface, wherein the thickness of the longitudinal ring plate 4 is less than the thickness of the inner ring plate 3.

[0125] For the mold, the mold cavity includes an inner ring plate cavity, which is used to form the longitudinal ring plate 4. The thickness of the inner ring plate cavity is greater than the thickness of the inner ring plate cavity.

[0126] During the injection molding process, the melt flows from the inner ring plate cavity to the longitudinal ring plate cavity, and the flow resistance of the melt in the inner ring plate cavity is smaller than the flow resistance in the longitudinal ring plate cavity. Therefore, the flow velocity of the melt in the inner ring plate cavity is greater than the flow velocity in the longitudinal ring plate cavity. At the junction of the inner ring plate cavity and the longitudinal ring plate cavity, the melt tends to flow from the inner ring plate cavity to the longitudinal ring plate cavity. The probability of the melt in the longitudinal ring plate cavity flowing to the inner ring plate cavity is smaller, which is convenient for forming a stable flow field, reducing or avoiding the probability of flow marks on the appearance surface 11 of the appearance plate 1 formed by the appearance plate cavity, and improving the yield of injection molded parts.

[0127] Exemplarily, the thickness of the inner ring plate 3 is 2 mm to 3 mm, for example, 2 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, etc.

[0128] For the mold, the thickness of the inner ring plate cavity is 2 mm to 3 mm, for example, 2 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, etc.

[0129] Illustratively, the thickness of the longitudinal ring plate 4 is 1.5 mm to 2.5 mm, for example, 1.5 mm, 1.7 mm, 1.9 mm, 2. mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0130] For the mold, the thickness of the longitudinal ring plate cavity is 1.5mm to 2.5mm, for example, 1.5mm, 1.7mm, 1.9mm, 2.mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0131] It should be noted that the inner ring plate 3 may be designed with uniform thickness or with non-uniform thickness along the radial direction of the inner ring plate 3. For example, the thickness of the inner ring plate 3 decreases or increases successively along the radial inward direction.

[0132] Similarly, the connecting plate 2 may be designed with uniform thickness or with non-uniform thickness along the radial direction of the connecting plate 2. For example, the thickness of the connecting plate 2 may decrease or increase in sequence along the radial inward direction.

[0133] The appearance plate 1 may be designed with uniform thickness or with non-uniform thickness along the radial direction of the appearance plate 1. For example, the thickness of the appearance plate 1 may decrease or increase in sequence along the radial inward direction.

[0134] In the description of this application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and features of different embodiments or examples without contradiction.

[0135] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An injection molded part, characterized in that: include: An appearance plate (1), wherein a surface of the appearance plate (1) on one side along the thickness direction is an appearance surface (11), A connecting plate (2), wherein the surface of the connecting plate (2) is a non-appearance surface, the connecting plate (2) is connected to the appearance plate (1), a gate forming portion (21) is provided at one end of the connecting plate (2) close to the appearance plate (1), the gate forming portion (21) is suitable for corresponding to the gate of the mold, one end of the gate forming portion (21) is connected to the appearance plate (1), and a material blocking portion (22) is provided around the remaining portion of the gate forming portion (21), the thickness of the material blocking portion (22) is less than the thickness of the gate forming portion (21), and less than the thickness of the connection portion between the appearance plate (1) and the gate forming portion (21).

2. The injection molded part according to claim 1, characterized in that The material blocking portion (22) is continuously arranged around the periphery except for the connection portion between the gate forming portion (21) and the appearance plate (1).

3. The injection molded part according to claim 1, characterized in that The thickness of one end of the appearance plate (1) close to the connection plate (2) is greater than the thickness of one end of the connection plate (2) close to the appearance plate (1).

4. The injection molded part according to claim 1, characterized in that The absolute value of the difference between the thickness of the portion of the appearance plate (1) used for connecting with the gate forming portion (21) and the thickness of the gate forming portion (21) does not exceed 1 mm.

5. The injection molded part according to claim 1, characterized in that There are a plurality of the material blocking portions (22), and the plurality of material blocking portions (22) are arranged at intervals in a direction away from the gate forming portion (21).

6. The injection molded part according to claim 1, characterized in that The width of the material blocking portion (22) in a direction away from the gate forming portion (21) is 5 mm to 15 mm.

7. The injection molded part according to claim 1, characterized in that The thickness of the material blocking portion (22) is 0.3 mm to 1.8 mm; and / or the thickness of the appearance plate (1) is 2.5 mm to 3.5 mm; and / or the thickness of the connecting plate (2) is 1.5 mm to 2.5 mm; and / or the thickness of the gate forming portion (21) is 1.5 to 4 mm.

8. The injection molded part according to claim 1, wherein: The appearance plate (1) and the connecting plate (2) are both annular, the appearance plate (1) surrounds the connecting plate (2), the number of the gate forming parts (21) is multiple, and the multiple gate forming parts (21) are arranged at intervals along the circumference of the connecting plate (2).

9. The injection molded part according to any one of claims 1 to 8, characterized in that: The injection molded part is a spray-free injection molded part, and the spray-free injection molded part comprises a resin matrix and metal particles distributed in the resin matrix.

10. A household appliance, characterized in that: The invention comprises the injection molded part according to any one of claims 1 to 9.

11. A mold for forming an injection molded part, characterized in that: The mold has a cavity and a gate, the cavity includes a gate cavity for forming a gate forming part (21), a material blocking cavity for forming a material blocking part (22), an appearance plate cavity for forming an appearance plate (1), and a connecting plate cavity for forming a connecting plate (2), the appearance plate cavity and the connecting plate cavity are connected, and the wall surface of the appearance plate cavity on one side along the thickness direction is used to form the appearance surface (11) of the appearance plate (1), the gate is arranged on one side of the gate cavity along the thickness direction, one end of the gate cavity is connected to the appearance plate cavity, and a material blocking cavity is arranged around the rest of the gate cavity, and the thickness of the material blocking cavity is less than the thickness of the gate cavity, and less than the thickness of the connecting part between the appearance plate cavity and the gate cavity.

12. The mold according to claim 11, characterized in that The material blocking cavity is continuously arranged around the periphery except the connection portion between the gate cavity and the appearance plate cavity.

13. The mold according to claim 11, characterized in that There are multiple material blocking cavities, which are spaced apart in a direction away from the gate cavity so that the melt for injection molding flows from the gate cavity through each of the material blocking cavities in sequence and then flows to the connecting plate cavity.

14. The mold according to claim 11, characterized in that The thickness of one end of the appearance plate cavity close to the connection plate cavity is greater than the thickness of one end of the connection plate cavity close to the appearance plate cavity.

15. The mold according to claim 11, characterized in that The width of the material blocking cavity from the direction close to the gate cavity to the direction away from the gate cavity is 5 mm to 15 mm.

16. The mold according to claim 11, characterized in that The thickness of the resist cavity is 0.3mm to 1.8mm; and / or the thickness of the appearance plate cavity is 2.5mm to 3.5mm; and / or the thickness of the connecting plate cavity is 1.5mm to 2.5mm; and / or the thickness of the gate cavity is 1.5 to 4mm.

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