CN116026091A - Injection molding, mold and household appliance - Google Patents

Abstract

The embodiment of the application provides an injection molding, mould and domestic appliance, the injection molding includes appearance board and connecting plate, the surface of appearance board along thickness direction one side is the outward appearance face, the surface of connecting plate is the non-outward appearance face, the connecting plate is connected with the appearance board, be provided with runner formation portion near the one end of appearance board at the connecting plate, runner formation portion is suitable for corresponding with the runner of mould, the one end and the appearance board of runner formation portion are connected, be provided with around the other positions of runner formation portion and hinder material portion, the thickness of hinder material portion is less than the thickness of runner formation portion, and be less than the thickness of the junction portion of appearance board and runner formation portion. The material blocking cavity can enable the melt to be full of the appearance plate cavity and the time difference full of the connecting plate cavity to be small in amplitude, the possibility that the melt in the connecting plate cavity continuously impacts a solidification layer in the appearance plate cavity is reduced, the probability of occurrence 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 molding parts is improved.

Description

Injection molding, mold and household appliance

Technical Field

The application relates to the technical field of injection molding, in particular to an injection molding piece, a mold and a household appliance.

Background

In the related art, the appearance surface of the injection molding piece is easy to generate the flow line defect, and when the flow line defect is obvious, the appearance of the product can be influenced, so that the flow line defect of the appearance surface of the injection molding piece can be strictly controlled, the qualification rate of the injection molding piece is lower, the rejection rate is higher, and the manufacturing cost is high.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an injection molding, a mold and a household appliance, which can reduce the flow defects on the appearance surface of the injection molding and improve the qualification rate of the injection molding.

An embodiment of the present application provides an injection molding, including:

an appearance plate, wherein the surface of one side of the appearance plate along the thickness direction is an appearance surface,

the connecting plate, the surface of connecting plate is the non-outward appearance face, the connecting plate with the outward appearance board is connected the connecting plate is close to the one end of outward appearance board is provided with runner formation portion, runner formation portion is suitable for the runner of mould to correspond, the one end of runner formation portion with the outward appearance board is connected, be provided with around the other positions of runner formation portion and hinder the material portion, hinder the thickness of material portion and be less than the thickness of runner formation portion, and be less than the outward appearance board with the thickness of the junction portion of runner formation portion.

In some embodiments, the material blocking portion is continuously disposed around a periphery of the gate forming portion other than a connection portion with the exterior plate.

In some embodiments, the thickness of the exterior panel near one end of the connection plate is greater than the thickness of the connection plate near one end of the exterior panel.

In some embodiments, the absolute value of the thickness difference of the portion of the exterior plate for connection with the gate forming portion is not more than 1mm.

In some embodiments, the number of the blocking portions is plural, and the plurality of blocking portions are arranged at intervals in a direction away from the gate forming portion.

In some embodiments, the width of the dam portion in a direction away from the gate forming portion is 5mm to 15mm.

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

In some embodiments, the appearance plate and the connecting plate are both annular, the appearance plate surrounds the connecting plate, the number of the gate forming parts is a plurality, and the plurality of the gate forming parts are arranged at intervals along the circumferential direction of the connecting plate.

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

The embodiment of the application provides a household appliance, which comprises the injection molding part according to any embodiment of the application.

The embodiment of the application provides a mould for shaping injection molding, the mould has die cavity and runner, the die cavity is including the runner die cavity that is used for shaping runner formation portion, be used for shaping the material die cavity that hinders of material portion, be used for shaping the appearance board die cavity of appearance board, be used for shaping the connecting plate die cavity of connecting plate, appearance board die cavity with connecting plate die cavity intercommunication, the wall of one side of appearance board die cavity along thickness direction is used for the shaping the outward appearance face of appearance board, the runner set up in one side of runner die cavity along thickness direction, the one end of runner die cavity with appearance board type cavity intercommunication, be provided with around the rest position of runner die cavity and hinder the material die cavity, hinder the thickness of material die cavity is less than the thickness of runner die cavity, and be less than the outward appearance board die cavity with the thickness of the junction of runner die cavity.

In some embodiments, the dam cavity is disposed continuously around a periphery of the gate cavity other than a junction of the appearance plate cavity.

In some embodiments, the number of the material blocking cavities is multiple, and the material blocking cavities are arranged at intervals along a direction away from the gate cavity, so that the melt for injection molding flows from the gate cavity through each material blocking cavity in sequence and then flows to the connecting plate cavity.

In some embodiments, the thickness of the end of the appearance plate cavity adjacent to the web cavity is greater than the thickness of the end of the web cavity adjacent to the appearance plate cavity.

In some embodiments, the width of the material blocking cavity from the direction close to the gate cavity to the direction far away from the gate cavity is 5mm to 15mm.

In some embodiments, the thickness of the material blocking cavity is 0.3 mm-1.8 mm; and/or the thickness of the appearance plate cavity is 2.5 mm-3.5 mm; and/or the thickness of the connecting plate cavity is 1.5 mm-2.5 mm; and/or the thickness of the gate cavity is 1.5-4 mm.

According to the embodiment of the application, during pouring, a melt enters a gate cavity from the gate, one part of the melt directly flows to an appearance plate cavity from the gate cavity, the other part of the melt directly flows to a blocking cavity from the gate cavity, and then flows to a connecting plate cavity from the blocking cavity. The thickness of the material blocking cavity is smaller than that of the gate cavity and smaller than that of the connecting part of the appearance plate cavity and the gate cavity, so that the resistance of the melt flowing from the gate cavity to the appearance plate cavity is smaller than that of the material blocking cavity, the speed and the flow rate of the melt flowing to the appearance plate cavity are larger than those of the material blocking cavity, that is, due to the thinning design of the material blocking cavity, a certain flow blocking effect is achieved on the melt, and the speed and the flow rate of the melt flowing to the connecting plate cavity are reduced.

It should be noted that, since the flow path between the gate cavity and the web cavity is not completely blocked by the material blocking cavity, the melt flows to the web cavity through the material blocking cavity at the same time as the melt flows to the appearance plate cavity, but the flow rate and the flow rate are smaller than those in the appearance plate cavity.

The design of material blocking cavity makes the appearance board die cavity be full of the fuse-element fast, and the fuse-element is full of the time difference that has a small margin between appearance board die cavity and the connecting plate die cavity that is full of, and at the juncture of appearance board die cavity and connecting plate die cavity, the fuse-element more tends to flow from appearance board type chamber to connecting plate die cavity, and the probability that the fuse-element flow direction in the connecting plate die cavity is less to appearance board die cavity, so, the fuse-element in the reducing connecting plate die cavity continuously assaults the probability of solidifying layer in the appearance board die cavity, reduces or avoids the probability that the appearance face of appearance board that appearance board type die cavity formed appears flow mark, promotes the yield of injection molding.

Drawings

FIG. 1 is a schematic view of an injection molding structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is a schematic view of an injection molding structure according to another embodiment of the present disclosure;

FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;

FIG. 5 is a partial cross-sectional view of the structure shown in FIG. 4;

FIG. 6 is another partial cross-sectional view of the structure shown in FIG. 4;

FIG. 7 is a schematic view of the structure of FIG. 3 from another perspective;

fig. 8 is a partial cross-sectional view of the structure shown in fig. 7.

Description of the reference numerals

1-appearance board; 11-appearance surface;

2-connecting plates; 21-a gate forming portion; 22-a material blocking part;

3-an inner ring plate; 4-a longitudinal ring plate;

100-door ring; 200-control panel

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "thickness," "length," "width," and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In this application, mm is the international unit millimeter. The present application will now be described in further detail with reference to the accompanying drawings and specific examples.

In order to improve the visual appearance of the product, the appearance of a part of plastic parts of the product is required to have a gorgeous metal appearance effect, and in order to enable the plastic parts to have a gorgeous metal appearance effect, in the related art, the manufacturing process of the plastic parts is mainly injection molding and spraying processes, namely, metal powder is sprayed on the outer surface of an injection molding blank formed by injection molding, and the sprayed plastic parts have a gorgeous metal appearance effect, but the spraying processes have the defects of large pollution, high cost, low qualification rate, unrecyclability after scrapping and the like.

In order to solve the defects of the spraying process, the spraying-free thermoplastic engineering plastic is generated, and the spraying-free injection molding is adopted to give the metal appearance effect to the product, so that the spraying process is canceled, and the emission of pollutants in the spraying process is avoided. However, flow marks are easily generated in both the spray injection molding process and the spray-free injection molding process. Because the melt of the spraying-free thermoplastic engineering plastic contains metal powder, the melt is easy to cause uneven distribution of the metal powder in the flowing process of the melt in the cavity of the die in the injection molding process, the produced spraying-free injection molding product has uneven light scattering under the irradiation of light, some parts have dark colors, flow marks are formed visually, the product has flow mark defects, the appearance quality of the spraying-free injection molding product cannot meet the appearance requirement of the product, the yield is low, the material is wasted, and the production cost is high. Therefore, it is difficult to use a spray-free injection molding process for existing plastic parts having high quality appearance requirements.

The embodiment of the application provides an injection molding piece, and the injection molding piece is an injection molding piece formed by integral injection molding, for example, the injection molding piece can be a spraying-free integral injection molding piece. For example, the injection-molded part according to the example of the present application is formed by injection molding from a melt composed of a matrix containing metal powder. That is, the material of the injection molded part includes a matrix and metal powder distributed in the matrix. The injection molding part formed by the matrix containing the metal powder has a metal appearance, and no additional spraying metal coating is needed, namely the plastic part is a spraying-free plastic part.

For convenience of description, the following description will be given by taking a melt composed of a matrix containing metal powder as an example to form an injection molded article by injection molding.

The type of metal powder is not limited, and exemplary metal powders include, but are not limited to, copper, silver, and/or aluminum, among others.

The metal powder refers to a form of a metal in a granular form. The size of the particles is not limited in this application.

The type of matrix is not limited, and exemplary matrices include, but are not limited to, resins and the like.

The field of application of the injection molded part is not limited. In the embodiments of the present application, the injection molding is described as an example of application to a home appliance. The home appliance may be a refrigerator, a laundry treating apparatus, or the like.

The laundry treating apparatus may be a washing machine, a clothes dryer, a washing and drying integrated machine, etc.

Referring to fig. 1, 2, 3 and 4, the injection molding member includes an appearance plate 1 and a connecting plate 2, and the connecting plate 2 is connected to the appearance plate 1.

The surface of the connection plate 2 is a non-exterior surface, that is, the surface of the connection plate 2 is not exposed to the outer surface of the household appliance, and the user cannot see the connection plate 2.

The specific shape of the connection plate 2 is not limited, and may be a substantially flat plate shape, a bent shape, or the like.

The surface of the exterior panel 1 on one side in the thickness direction is an exterior surface 11, and the exterior surface 11 can be directly seen.

The specific shape of the exterior panel 1 is not limited, and the exterior panel 1 may be a substantially flat plate shape, and only one surface may be the exterior surface 11, or the exterior panel 1 may be a bent plate shape, and at least two surfaces may be the exterior surface 11.

A gate forming portion 21 is provided at one end of the connecting plate 2 near the exterior plate 1, and the gate forming portion 21 is adapted to correspond to a gate of a mold. That is, the gate forming portion 21 is provided adjacent to the exterior panel 1, and the gate forming portion 21 is provided as close as possible to the exterior panel 1 in the case where the gate forming portion 21 does not affect the exterior surface 11 of the exterior panel 1 and the mold design and the casting are satisfied.

One end of the gate forming portion 21 is connected to the exterior plate 1, 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 smaller than the thickness of the gate forming portion 21 and smaller than the thickness of the connection portion of the exterior plate 1 and the gate forming portion 21, that is, there is no thinning process on the side where the gate forming portion 21 is connected to the exterior plate 1, and thinning process is performed on the remaining portion around the gate forming portion 21.

The material blocking portion 22 is thinned, so that the material blocking portion 22 may be formed with a groove structure on one side of the injection molding member in the thickness direction or may be formed with a groove structure on both sides of the injection molding member in the thickness direction in the external view of the injection molding member.

In order to clearly illustrate the injection molding provided by the embodiments of the present application, the mold provided by the embodiments of the present application is described first, and the mold is used for injection molding the injection molding provided by the embodiments of the present application.

The embodiment of the application provides a mold, which is provided with a cavity and a gate. During injection molding, the melt enters the cavity from the gate, fills the cavity, and after the molding is cooled, opens the mold to obtain the injection molding piece.

The cavities include a gate cavity for molding the gate forming portion 21, a resist cavity for molding the resist portion 22, an appearance plate cavity for molding the appearance plate 1, and a web cavity for molding the web 2.

The appearance plate cavity is communicated with the connecting plate cavity, the wall surface of one side of the appearance plate cavity along the thickness direction is used for forming the appearance surface 11 of the appearance plate 1, the pouring gate is arranged on one side of the pouring gate cavity along the thickness direction, one end of the pouring gate cavity is communicated with the appearance plate cavity, the periphery of the rest part of the pouring gate cavity is provided with a material blocking cavity, that is, the material blocking cavity is positioned on a flow path of melt flowing from the pouring gate cavity to the connecting plate cavity, and the melt flows through the material blocking cavity and then flows to the connecting plate cavity.

The thickness of the material blocking cavity is smaller than that of the gate cavity and smaller than that of the connecting part of the appearance plate cavity and the gate cavity. That is, the gate cavity is designed to be thinned around the remaining portion except for the side facing the exterior plate cavity.

The specific analysis of the cause of flow marks in injection molded parts is as follows:

after entering the mould through the gate, the hotter melt contacts with the wall surface of the cooler cavity in the flowing process, and the hotter melt is quickly frozen on the wall surface of the cavity to form a thinner solidification layer. The flow direction of the metal powder in the solidification layer determines the appearance quality of the injection molding piece, and the stably flowing metal powder can form consistent metal powder orientation to obtain better appearance. During the process of flowing the melt in the cavity, if the melt of the non-appearance cavity continuously impacts the appearance cavity, the orientation of metal powder in a solidification layer of the appearance cavity becomes disordered, and obvious flow mark problems appear in the appearance.

The non-exterior cavity is a cavity for forming a structure having a non-exterior surface, for example, the above-described web cavity. The appearance cavity is a cavity for forming a structure having the appearance surface 11, for example, the above-described appearance plate cavity.

The principle of reducing flow marks in the embodiments of the present application is specifically described below.

When the melt is injected into the mold, the melt contacts the cooler cavity wall surface of the cavity, the temperature is reduced, a solidified layer is generated on the cavity wall surface, the flow area of the cavity is reduced along with the thickness of the solidified layer, and the fluidity is proportional to the cube of the thickness, so that the larger the thickness of the cavity is, the smaller the flow resistance is, the better the fluidity is, and the faster the flow velocity is.

According to the embodiment of the application, during pouring, a melt enters a gate cavity from the gate, one part of the melt directly flows to an appearance plate cavity from the gate cavity, the other part of the melt directly flows to a blocking cavity from the gate cavity, and then flows to a connecting plate cavity from the blocking cavity. The thickness of the material blocking cavity is smaller than that of the gate cavity and smaller than that of the connecting part of the appearance plate cavity and the gate cavity, so that the resistance of the melt flowing from the gate cavity to the appearance plate cavity is smaller than that of the material blocking cavity, the speed and the flow rate of the melt flowing to the appearance plate cavity are larger than those of the material blocking cavity, that is, due to the thinning design of the material blocking cavity, a certain flow blocking effect is achieved on the melt, and the speed and the flow rate of the melt flowing to the connecting plate cavity are reduced.

It should be noted that, since the flow path between the gate cavity and the web cavity is not completely blocked by the material blocking cavity, the melt flows to the web cavity through the material blocking cavity at the same time as the melt flows to the appearance plate cavity, but the flow rate and the flow rate are smaller than those in the appearance plate cavity.

The design of material blocking die cavity makes the appearance board die cavity be full of the fuse-element fast, the fuse-element is full of the time difference that has a small margin between appearance board die cavity and the connecting plate die cavity that is full of, in the juncture of appearance board die cavity and connecting plate die cavity, the fuse-element more tends to flow from appearance board type chamber to connecting plate die cavity, the probability that the fuse-element flow in the connecting plate die cavity flows to appearance board die cavity is less, so, the fuse-element in the reducing connecting plate die cavity continuously assaults the possibility of solidifying layer in the appearance board die cavity, reduce or avoid the probability that appearance board 1's appearance face 11 appears flow mark that appearance board die cavity formed, promote the yield of injection molding.

The material blocking portion 22 extends substantially along the periphery of the gate forming portion 21, and it is understood that the material blocking portion 22 may be entirely continuous along the extending direction or may be discontinuous in a locally narrow range.

Illustratively, the blocking portion 22 is continuously provided around the periphery of the gate forming portion 21 other than the connection portion with the exterior panel 1 to exert a better blocking effect.

The shape of the material blocking portion 22 is not limited, for example, in some embodiments, referring to fig. 1 and 2, the material blocking portion 22 is generally U-shaped, and an opening side of the U-shape faces a side of the appearance board 1. In other embodiments, referring to fig. 1, 2 and 3, the material blocking portion 22 is formed by sequentially connecting a plurality of linear structures.

The width of the material blocking portion 22 in the melt flow direction is not limited, and structural strength may be ensured.

The number of the blocking portions 22 is not limited. The number of the blocking portions 22 herein is not limited to the number of the single gate forming portion 21, that is, the number of the blocking portions 22 corresponding to each gate forming portion 21.

For example, in some embodiments, referring to fig. 3 and 4, the number of the blocking portions 22 is one.

For example, referring to fig. 1 and 2, the number of the blocking portions 22 is plural, the plurality of blocking portions 22 are arranged at intervals in a direction away from the gate forming portion 21, and the blocking portion 22 farther from the gate forming portion 21 surrounds the blocking portion 22 nearer to the gate forming portion 21. For the mould, the quantity of the material blocking cavities is a plurality of, and the material blocking cavities are arranged at intervals along the direction away from the gate cavity, so that the melt for injection molding flows through each material blocking cavity from the gate cavity in sequence and then flows to the connecting plate cavity. In the pouring process, the melt can flow through a plurality of material blocking cavities in sequence before flowing to the connecting plate cavity, each material blocking cavity can form flow blocking for the melt, and the plurality of material blocking cavities can form a more obvious flow blocking effect for the melt, so that the melt can be more reliably filled with the appearance plate cavity firstly and then with the connecting plate cavity.

Illustratively, the thickness of the end of the exterior plate 1 near the connection plate 2 is greater than the thickness of the end of the connection plate 2 near the exterior plate 1.

For the mold, the thickness of one end of the appearance plate cavity, which is close to the connecting plate cavity, is larger than that of one end of the connecting plate cavity, which is close to the appearance plate cavity.

At the juncture of connecting plate die cavity and appearance board die cavity, because the thickness of connecting plate die cavity is less, consequently, also play certain choked flow effect, reduce the probability that the fuse-element in the connecting plate die cavity flows to appearance board die cavity, reduce the possibility that the fuse-element in the connecting plate die cavity impacted the outward appearance face 11 of appearance board die cavity for the stable flow field is easier to form in the appearance board forms, reduces the probability that appears the flow mark, promotes the yield of injection molding.

It should be noted that, because the flow velocity of the melt in the appearance plate cavity is greater than the flow velocity in the connecting plate cavity, therefore, at the juncture of the connecting plate cavity in the appearance plate cavity, the melt in the appearance plate cavity is easy to curl and turn over towards one side of the connecting plate cavity, however, because the part molded by the connecting plate cavity is the connecting plate 2, the surface of the connecting plate 2 is a non-appearance surface, even flaws such as marks are left, the appearance of the injection molding is not affected, therefore, the connecting plate 2 does not require the flaws, and some possible flaws and some unavoidable flaws can be put on the connecting plate 2.

Illustratively, the gate forming portion 21 is of a substantially uniform thickness design, i.e., the thickness of each portion of the gate forming portion 21 is substantially equal.

Illustratively, the absolute value of the difference between the thickness of the portion of the exterior plate 1 for connection with the gate forming portion 21 and the thickness of the gate forming portion 21 is not more than 1mm. That is, the thickness of the portion of the exterior plate 1 to be connected to the gate forming portion 21 may be larger than the thickness of the gate forming portion 21, or may be equal to the thickness of the gate forming portion 21, or the thickness of the portion of the exterior plate 1 to be connected to the gate forming portion 21 may be smaller than the thickness of the gate forming portion 21.

Illustratively, referring to fig. 8, the width H of the dam 22 in the direction away from the gate forming portion 21 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, or the like. That is, the length of the flow path of the melt in the dam 22 is not less than the above-described width of the dam 22.

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, and the like.

The width range ensures that the material blocking cavity can play a good flow blocking effect in the casting process, and the thinning treatment of the material blocking part 22 does not obviously influence the structural strength.

It should be noted that, if the width of the material blocking portion 22 is too large, the size of the material blocking portion 22 due to the thinning treatment may affect the overall structural strength of the injection molding member, and if the size of the material blocking portion 22 is too narrow, the flow blocking effect is not ideal, so that the embodiment of the application controls the width of the material blocking portion 22 in the above range, and the effect of blocking the overall structural strength of the injection molding member can be satisfied.

Illustratively, the thickness of the material blocking portion 22 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, and the like.

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, and the like.

In this embodiment, the thickness ranges of the material blocking portion 22 and the material blocking cavity can better control the proper flow rate and flow rate of the melt flowing through the material blocking cavity.

Illustratively, the thickness of the exterior panel 1 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, and the like.

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. for the mold.

In the embodiment, the thickness ranges of the appearance plate 1 and the appearance cavity can ensure that the melt has better flowing speed in the appearance cavity, and the appearance plate 1 can also have structural strength and material cost.

The design plate 1 may be of an equal thickness design or an unequal thickness design, and is not limited thereto.

Illustratively, the thickness of the web 2 is 1.5mm to 2.5mm, e.g., 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

For the die, the thickness of the connecting plate cavity is 1.5 mm-2.5 mm. 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.

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 a proper thickness range, and the structural strength and the material cost of the connecting plate 2 are guaranteed.

Illustratively, the thickness of the gate forming portion 21 is 1.5mm to 4mm, for example, 1.5mm, 1.8mm, 2.0mm, 2.3mm, 2.7mm, 3mm, 3.4mm, 3.6mm, 3.8mm, 4mm, and the like.

The thickness of the gate cavity is 1.5 to 4mm for the mold, for example, 1.5mm, 1.8mm, 2.0mm, 2.3mm, 2.7mm, 3mm, 3.4mm, 3.6mm, 3.8mm, 4mm, and the like.

In this embodiment, the thickness ranges of the gate forming portion 21 and the gate cavity facilitate the flow of the melt around the gate cavity with a large flow rate in the gate cavity, and the injection efficiency is improved.

In the above-described thickness range, the value is required to be obtained on the premise that the relative thickness relationship is satisfied.

For example, the thickness of the material blocking portion 22 is smaller than the thickness of the gate forming portion 21, and when the thickness of the material blocking portion 22 is 1.8mm, the thickness of the gate forming portion 21 needs to be taken within a range of more than 1.8mm and not more than 4mm. When the thickness of the material blocking portion 22 is 0.3mm, the thickness of the gate forming portion 21 may be arbitrarily set within a range of 1.5mm to 4mm.

The specific type of injection molded part is not limited. For example, in some embodiments, the injection-molded part is the control panel 200 of the laundry treatment apparatus, the control panel 200 is substantially in the shape of an elongated plate, and the exterior panel 1 and the connection panel 2 are substantially arranged in the length direction.

In other embodiments, the injection molded part is a door ring 100 of a laundry treatment apparatus, and the door ring 100 has a substantially circular shape.

Two embodiments of the injection molding are described below by way of example with reference to the accompanying drawings.

First embodiment

Referring to fig. 1 and 2, the injection molding member is generally in the shape of an elongated plate, for example, a control panel 200 of a laundry treating apparatus.

The number of the material blocking portions 22 is two, one material blocking portion 22 is approximately U-shaped, the opening of the U-shaped opening faces the appearance plate 1, and the other material blocking portion 22 is formed by connecting a plurality of linear structures. The width of each blocking portion 22 is smaller, and the flow blocking effect is improved by increasing the number of blocking cavities. For example, the width of the blocking portion 22 is about 1mm to 3mm.

Second embodiment

Referring to fig. 3 to 8, the exterior plate 1 and the connection plate 2 are both annular, the exterior plate 1 surrounds the connection plate 2, and the exterior plate 1 and the connection 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 laundry treating apparatus.

Correspondingly, the appearance plate cavity and the connecting plate cavity are annular, and the appearance plate cavity surrounds the connecting plate cavity. One end of the pouring gate cavity which is outwards along the radial direction is communicated with the appearance plate type cavity. During injection molding, the melt is flushed from the gate cavity into the appearance plate cavity in a radially outward direction and flows generally circumferentially in the appearance plate cavity.

The number of gate forming portions 21 may be one or a plurality. Accordingly, the number of gates of the mold may be one or more.

Illustratively, the number of gate forming portions 21 is plural, and the plural gate forming portions 21 are arranged at intervals in the circumferential direction of the connecting plate 2.

Illustratively, the plurality of gates are sequentially opened in the circumferential direction at preset time intervals. That is, the plurality of gates do not open the injection at the same time, but there is a sequence. On the one hand, a plurality of pouring gates are adopted, so that the problem that a single pouring gate is difficult to fill a cavity rapidly is avoided. On the other hand, the multiple gates are sequentially opened according to the preset time interval, so that one-way flow of the melt can be ensured, a continuous leading flow front is formed, and the probability of an unstable flow field is reduced.

It should be noted that, the specific duration of the preset time interval may be set according to the actual production requirement, which is not limited in this application.

For example, referring to fig. 3 and 4, the injection molding includes an inner ring plate 3, a connecting plate 2 is provided around the inner ring plate 3, and a gate forming portion 21 and the inner ring plate 3 are connected by a blocking portion 22. That is, the gate forming portion 21 is not directly connected to the inner ring plate 3.

For the die, the cavity comprises an inner ring plate cavity, the inner ring plate cavity is used for forming the inner ring plate 3, the connecting plate cavity is arranged around the inner ring plate cavity, and the gate forming cavity is communicated with the inner ring plate cavity through the material blocking cavity. Specifically, the two opposite sides of the gate forming cavity along the circumferential direction are communicated with the connecting plate cavity, the outer side along the radial direction is communicated with the appearance plate cavity, and the inner side along the radial direction is communicated with the inner ring plate cavity.

In the injection molding process, the melt flows from the gate cavity to the material blocking cavity and then from the material blocking cavity to the inner annular plate cavity.

Illustratively, the thickness of the inner ring plate 3 is greater than the thickness of the connecting plate 2, and referring to fig. 5 and 6 in combination, the thickness of the portion 22b of the dam 22 connected between the inner ring plate 3 and the gate forming portion 21 is not less than the thickness of the portion 22a of the dam 22 connected between the gate forming portion 21 and the connecting plate 2. The surface of one side of the connection plate 2 in the thickness direction is a secondary appearance surface.

It can be understood that the appearance board 1 is a main appearance board, and the appearance surface 11 of the appearance board 1 is the main appearance surface 11, which is the very important appearance surface 11 of the product, and can be touched and seen by a user. The inner ring plate 3 is a secondary appearance plate, and the secondary appearance surface of the inner ring plate 3 is also an appearance surface 11 which can be seen by a user, but the importance degree is lower than that of the main appearance surface 11, for example, a light-transmitting plate is arranged on the outer side of the secondary appearance surface of the inner ring plate 3, and the secondary appearance surface of the inner ring plate 3 can be seen by the user but is not touched.

For the mold, the thickness of the part of the material blocking cavity connected between the inner annular plate cavity and the gate cavity is not smaller than the thickness of the part of the material blocking cavity connected between the gate cavity and the connecting plate cavity.

In this embodiment, the flow rate and the speed of the melt flowing from the material blocking cavity to the inner annular plate cavity are not smaller than the flow rate and the speed flowing to the connecting plate cavity, and in addition, the thickness of the inner annular plate cavity is larger than the thickness of the connecting plate cavity, so that the flow speed of the melt in the inner annular plate cavity is larger than the flow speed in the connecting plate cavity, the melt is filled with the inner annular plate cavity and the connecting plate cavity, a small time difference exists between the inner annular plate cavity and the connecting plate cavity, and at the junction of the appearance plate cavity and the connecting plate cavity, the melt is more prone to flowing from the appearance plate cavity to the connecting plate cavity, and the probability that the melt in the connecting plate cavity flows to the appearance plate cavity is smaller, so that the possibility that the melt in the connecting plate cavity continuously impacts a solidified layer in the appearance plate cavity is reduced or avoided, the probability that flow marks occur on the appearance surface 11 of the appearance plate 1 formed by the appearance plate cavity is reduced, and the yield of injection molded parts is improved.

For example, the thickness of the portion of the dam cavity connected between the inner annular plate cavity and the gate cavity is 0.1mm to 0.2mm greater than the thickness of the portion of the dam cavity connected between the gate cavity and the web cavity.

For example, referring to fig. 3, the injection molded article includes a longitudinal ring plate 4, the longitudinal ring plate 4 extending from a radially inner end of the inner ring plate 3 toward a side facing away from the minor appearance surface in a thickness direction of the inner ring plate 3, wherein a thickness of the longitudinal ring plate 4 is smaller than a thickness of the inner ring plate 3.

For the mold, the cavity of the mold includes an inner ring plate cavity for molding the longitudinal ring plate 4, and the thickness of the inner ring plate cavity is larger than that for the inner ring plate cavity.

In the injection molding process, the melt flows from the inner annular plate cavity to the longitudinal annular plate cavity, the flow resistance of the melt in the inner annular plate cavity is smaller than that in the longitudinal annular plate cavity, so that the flow speed of the melt in the inner annular plate cavity is higher than that in the longitudinal annular plate cavity, the melt is more prone to flow from the inner annular plate cavity to the longitudinal annular plate cavity at the junction of the inner annular plate cavity and the longitudinal annular plate cavity, the probability that the melt in the longitudinal annular plate cavity flows to the inner annular plate cavity is smaller, a stable flow field is formed conveniently, the probability of occurrence of flow marks 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.

Illustratively, the thickness of the inner ring plate 3 is 2mm to 3mm, e.g., 2mm, 2.3mm, 2.5mm, 2.7mm, 2.9mm, 3mm, etc.

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

Illustratively, the longitudinal ring plate 4 has a thickness of 1.5mm to 2.5mm, for example, 1.5mm, 1.7mm, 1.9mm, 2.mm, 2.3mm, 2.4mm, 2.5mm, etc.

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. for the mold.

The inner ring plate 3 may be of an equal thickness or a non-equal thickness along the radial direction of the inner ring plate 3. For example, the thickness of the inner ring plate 3 decreases in turn or increases in turn in a radially inward direction.

Similarly, along the radial direction of the connecting plate 2, the connecting plate 2 can be of an equal thickness design or a non-equal thickness design. For example, in a radially inward direction, the thickness of the connection plate 2 decreases in turn or increases in turn.

Along the radial direction of the appearance plate 1, the appearance plate 1 can be designed with equal thickness or non-equal thickness. For example, the thickness of the exterior panel 1 decreases in order or increases in order in the radially inward direction.

In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is 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 are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (16)

1. An injection molded article, comprising:

an appearance plate (1), wherein one surface of the appearance plate (1) along the thickness direction is an appearance surface (11),

connecting plate (2), the surface of connecting plate (2) is the non-outward appearance face, connecting plate (2) with appearance board (1) is connected connecting plate (2) is close to the one end of appearance board (1) is provided with runner formation portion (21), runner formation portion (21) are suitable for the runner of corresponding with the mould, the one end of runner formation portion (21) with appearance board (1) is connected, be provided with around the other positions of runner formation portion (21) and hinder material portion (22), hinder the thickness of material portion (22) is less than the thickness of runner formation portion (21), and be less than appearance board (1) with the thickness of the junction portion of runner formation portion (21).

2. Injection molding according to claim 1, characterized in that the material blocking portion (22) is arranged continuously around the periphery of the gate forming portion (21) outside the connection portion with the exterior plate (1).

3. Injection molding according to claim 1, characterized in that 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).

4. Injection molding according to claim 1, characterized in that the absolute value of the difference between the thickness of the portion of the appearance plate (1) for connection with the gate forming portion (21) and the thickness of the gate forming portion (21) is not more than 1mm.

5. Injection molding according to claim 1, wherein the number of the material blocking portions (22) is plural, and the plurality of material blocking portions (22) are arranged at intervals in a direction away from the gate forming portion (21).

6. Injection molding according to claim 1, wherein the width of the material blocking portion (22) in a direction away from the gate forming portion (21) is 5mm to 15mm.

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

8. Injection molding according to claim 1, wherein the appearance plate (1) and the connecting plate (2) are annular, the appearance plate (1) surrounds the connecting plate (2), the number of the gate forming parts (21) is plural, and the plural gate forming parts (21) are arranged at intervals along the circumferential direction of the connecting plate (2).

9. The injection molded article according to any one of claims 1 to 8, wherein the injection molded article is a spray-free injection molded article having a resin matrix and metal particles distributed in the resin matrix.

10. A household appliance comprising an injection-molded part according to any one of claims 1 to 9.

11. A mold for molding an injection molded article, characterized in that,

the mold is provided with a cavity and a gate, the cavity comprises 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 is communicated with the connecting plate cavity, a wall surface of one side of the appearance plate cavity along the thickness direction is used for forming an 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 communicated with the appearance plate cavity, material blocking cavities are arranged around the rest parts of the gate cavity, and the thickness of the material blocking cavity is smaller than that of the gate cavity and smaller than that of a connecting part of the appearance plate cavity and the gate cavity.

12. The mold according to claim 11, wherein the dam cavity is provided continuously around a periphery other than a connection portion of the gate cavity and the exterior panel cavity.

13. The mold of claim 11, wherein the number of said dam cavities is plural, and the plurality of dam cavities are spaced apart in a direction away from said gate cavity so that melt for injection molding flows from said gate cavity through each of said dam cavities in sequence to said web cavity.

14. The mold of claim 11, wherein the thickness of the end of the appearance plate cavity adjacent to the web cavity is greater than the thickness of the end of the web cavity adjacent to the appearance plate cavity.

15. The mold according to claim 11, wherein the width of the dam cavity from the direction close to the gate cavity to the direction away from the gate cavity is 5mm to 15mm.

16. The mold of claim 11, wherein the thickness of the material blocking cavity is 0.3mm to 1.8mm; and/or the thickness of the appearance plate cavity is 2.5 mm-3.5 mm; and/or the thickness of the connecting plate cavity is 1.5 mm-2.5 mm; and/or the thickness of the gate cavity is 1.5-4 mm.

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