WO2021043025A1

WO2021043025A1 - Spray-free base and preparation method therefor

Info

Publication number: WO2021043025A1
Application number: PCT/CN2020/110997
Authority: WO
Inventors: 张丽; 饶春利
Original assignee: 惠州视维新技术有限公司
Priority date: 2019-09-03
Filing date: 2020-08-25
Publication date: 2021-03-11
Also published as: CN112440433A

Abstract

A spray-free base and a preparation method therefor, the method comprising the following steps: preparing a metal insert and placing the metal insert in a mold for positioning; blending metal powder with a substrate and then granulating to obtain a substrate-metal powder material; and injecting the substrate-metal powder material into the mold to form a housing covering the metal insert and then demolding to obtain the spray-free base.

Description

Spray-free base and preparation method thereof

priority

This disclosure claims the priority of a Chinese patent application filed with the Chinese Patent Office on September 3, 2019, the application number is "201910831380.6", and the application name is "a spray-free base and its preparation method", the entire content of which is approved Reference is incorporated in this disclosure.

Technical field

The present disclosure relates to the technical field of bases, in particular to a spray-free base and a preparation method thereof.

Background technique

With the increasing demand of domestic consumers for large-screen TVs, the market share of large-size products above 46 inches is gradually increasing, and market competition is becoming more and more fierce. In the prior art, the TV base is designed with a single base, and the load-bearing load of the entire TV is concentrated on one base, which leads to higher requirements for the load-bearing load of the base. At the same time, large-size TVs require The size of the base is also getting larger. At present, large-size TVs on the market basically use metal die-casting bases, which require complicated post-processing such as polishing and painting, resulting in higher costs for metal bases.

Therefore, the current spray-free base and its preparation method need to be improved and developed.

Summary of the invention

The technical problem to be solved by the present disclosure is to provide a spray-free base and a preparation method thereof in view of the above-mentioned defects of the prior art, aiming to solve the problem of complicated post-processing such as sanding and painting of the base in the prior art.

The technical solutions adopted by the present disclosure to solve the technical problems are as follows:

A method for preparing a spray-free base, which includes the following steps:

Preparing a metal insert and placing the metal insert in the mold for positioning;

The metal powder is blended with the base material and then granulated to obtain the base metal powder material;

The base metal powder material is injected into the mold to form a shell that wraps the metal insert, and then demolded to obtain the spray-free base.

The method for preparing the spray-free base, wherein the step of preparing the metal insert and placing the metal insert in a mold for positioning includes:

Make a hole on the surface of the metal sheet to obtain a metal insert;

A fixing part is arranged in the mold, and the metal insert is fixed on the fixing part.

In the preparation method of the spray-free base, in the step of positioning the metal insert in the mold, the distance between the metal insert and the inner wall of the mold is ≥ 2 mm.

In the preparation method of the spray-free base, the metal powder is one or more of aluminum powder, iron powder or copper powder.

The method for preparing the spray-free base, wherein the substrate is one or more of acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, and polyamide.

The method for preparing the spray-free base, wherein the particle size of the metal powder is ≤ 20 μm.

The method for preparing the spray-free base, wherein the mass fraction of the metal powder in the base metal powder material is 0.5-1 wt%.

A spray-free base, which includes: a metal insert;

A shell wrapped around the metal insert, the shell comprising:

Substrate

Metal powder dispersed in the substrate;

Wherein, the shell is formed by injection molding.

In the spray-free base, a connecting plate for connecting with the supported object is provided on the shell, and the connecting plate is integrally formed with the shell.

In the spray-free base, the connecting plate is provided with a screw hole, and the screw hole can pass through the screw to fix the supported object to the connecting plate.

In the spray-free base, the connecting plate includes a connecting plate insert, and the connecting plate insert is connected with the metal insert.

In the spray-free base, wherein the bottom of the shell is provided with a through hole of a fixing member.

In the spray-free base, the cross section of the shell is trapezoidal, the connecting plate is located at the upper bottom of the trapezoidal shell, and the through hole of the fixing member is located at the lower bottom of the trapezoidal shell.

In the spray-free base, wherein the metal insert is a V-shaped metal insert.

In the spray-free base, the V-shaped metal insert is an obtuse-angled V-shaped metal insert.

The spray-free base, wherein the thickness of the shell is ≥2mm.

In the spray-free base, wherein the surface of the metal insert is provided with a through hole.

The spray-free base, wherein the substrate is one or more of acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, and polyamide.

The spray-free base, wherein the particle size of the metal powder is ≤ 20 μm.

In the spray-free base, the mass fraction of the metal powder in the shell is 0.5-1 wt%.

Beneficial effects: The present disclosure sets the shell on the basis of the metal insert. After the metal powder and the base material are mixed to form the shell, the surface of the shell presents a metallic texture and does not require additional polishing and painting. Moreover, the metal insert has higher strength, so that the spray-free base has higher strength and is not easily damaged.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of a metal insert in the present disclosure.

Fig. 2 is a schematic diagram of the first structure of the spray-free base in the present disclosure.

Fig. 3 is a first cross-sectional view of the spray-free base of the present disclosure.

Fig. 4 is a schematic diagram of the second structure of the spray-free base in the present disclosure.

Fig. 5 is a second cross-sectional view of the spray-free base in the present disclosure.

Fig. 6 is a flow chart of the preparation method of the spray-free base in the present disclosure.

Reference signs: 10: metal insert; 11: through hole; 20: housing; 21: connecting plate; 211: screw hole; 22: fixing member through hole.

detailed description

In order to make the objectives, technical solutions, and advantages of the present disclosure clearer and clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present disclosure, but not used to limit the present disclosure.

Please refer to FIGS. 1 to 5 at the same time. The present disclosure provides some embodiments of a spray-free base.

As shown in Figures 3 and 4, the spray-free base of the present disclosure includes: a metal insert 10, a shell 20 wrapped around the metal insert 10; Metal powder in the base material; wherein the shell is formed by injection molding.

It is worth noting that the substrate is one of acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polymethyl methacrylate (PMMA), polyamide (PA) or Many kinds. If only the base material or base metal powder materials (ie, base material and metal powder) are used to make the base, the strength of the base does not meet the requirements, and it is prone to deformation and damage to the base. In the present disclosure, a metal insert 10 is arranged in the housing 20. The metal insert 10 is made of metal, and the metal insert 10 has a relatively high strength. If only metal is used to make the base, the metal base needs to be polished and painted. The present disclosure sets the shell 20 on the basis of the metal insert 10. After the metal powder and the base material are mixed to form the shell 20, the surface of the shell 20 appears A metallic texture is produced, and no additional sanding and painting are required.

Specifically, the metal insert 10 can provide strength for the plastic base, and the shell 20 wrapped around the metal insert 10 can provide a metallic appearance. Therefore, the spray-free injection molding base of the metal insert 10 can not only meet the strength requirements, but also Avoid secondary spraying, reduce the overall cost of the TV base with a metallic appearance, and have greater market competitiveness. It can replace the metal die-cast base of a large-size TV, and directly inject the base through metal inserts and spray-free materials, reducing the cost of a large-size (55-inch and above) TV base. Eliminates post-treatment processes such as painting, and meets environmental protection requirements.

When the base material and metal powder are used to form the shell, the metal powder is evenly dispersed in the base material. The metal powder can increase the strength and toughness of the base material. When the base material produces microcracks, the metal powder can prevent the cracks from spreading. Metal powder avoids the problem that the substrate will soften due to the influence of temperature during use: On the one hand, the addition of metal powder increases the thermal conductivity of the substrate, and heat can be transferred to the metal insert. The heat disperses quickly and avoids the softening of the base material close to the heat source. On the other hand, since the melting point of metal powder is usually higher, the addition of metal powder will also increase the overall softening temperature of the base material and metal powder, thereby preventing the base material and metal from softening. The powder softens. Moreover, during injection molding, after adding metal powder to the base material, the difference between the surface of the base material and the surface of the metal insert is reduced, and the molten base material dispersed with the metal powder is more closely attached to the metal insert, that is, In other words, the problem of separation of the metal insert from the base metal powder material will not occur, and a more stable base can be obtained.

In order to make the metal have better dispersibility in the base material, the metal powder can be mixed with the base material and then extruded through a (twin) screw extruder, pelletized, and then the granular base metal powder material is used for injection molding to obtain the base. . Since the expansion coefficients of the metal powder and the base material are different, the volume shrinkage rate of the metal powder is small, and the molten base material shrinks more in volume during the cooling process. The metal powder on the surface of the base will protrude from the surface of the base material. The light will diffusely reflect the light, which naturally forms a matte matte surface, without the need for subsequent polishing and processing into a matte matte surface.

In a preferred embodiment of the present disclosure, as shown in FIGS. 2 and 4, the housing 20 is provided with a connecting plate 21 for connecting with the supported object, and the connecting plate 21 is connected to the housing 20. One piece.

Specifically, in the present disclosure, the supported object may be an electronic device such as a television, and the connecting plate 21 is provided with a screw hole 211, and a screw can be used to pass through the screw hole 211 to fix the supported object on the connecting plate 21, thereby making the base Supports the object to be supported. The connecting plate 21 and the housing 20 are integrally formed. The housing 20 is injection-molded. That is to say, the connecting plate 21 also includes the base material and metal powder. The metal powder can increase the strength and toughness of the connecting plate 21, and the connecting plate 21 is not easily damaged. So as to ensure the safety of the supported object. Of course, the metal insert 10 can also be provided with a connecting plate insert, and then through injection molding, the base metal powder material is injected on the surface of the metal insert 10 and the connecting plate insert, and the connecting plate insert and the base metal powder material are formed. The connecting plate 21 is relatively stable.

In a preferred embodiment of the present disclosure, as shown in FIGS. 3 and 4, a fixing member through hole 22 is provided at the bottom of the housing 20.

Specifically, in order to wrap the surface of the metal insert 10 as evenly as possible, the metal insert 10 needs to be fixed in the middle of the mold, and the bottom of the metal insert 10 is fixed in the mold by a fixing member. During the injection molding process, the metal insert 10 There is no base metal powder material at the connection with the fixing member, so that the fixing member through hole 22 is formed. Referring to FIG. 5, the cross section of the housing is trapezoidal, the connecting plate 21 is located at the upper bottom of the trapezoid, and the fixing member through hole 22 is located at the lower bottom of the trapezoid, so that the base is more stable.

In a preferred embodiment of the present disclosure, as shown in FIGS. 1 and 3, the surface of the metal insert 10 is provided with a through hole 11, that is, during the injection molding process, the base metal powder material will pass through the through hole 11 The hole 11 connects the two sides of the metal insert 10. Therefore, the connection force between the housing 20 and the metal insert 10 is strengthened, and the housing 20 is prevented from being separated from the metal insert 10.

In a preferred embodiment of the present disclosure, as shown in FIGS. 1 and 3, the metal insert 10 is a V-shaped metal insert. Specifically, the base made of the V-shaped metal insert is more stable and will not swing from side to side. Further, the V-shaped metal insert is an obtuse-angled V-shaped metal insert, and the stability is better when the V-shape is an obtuse angle.

In a preferred embodiment of the present disclosure, as shown in FIGS. 4 and 5, the thickness of the casing 20 is ≥ 2 mm. Specifically, the thickness of the housing 20 is not uniform, and the thinnest part of the housing 20 must be greater than or equal to 2 mm. As shown in FIG. 3, the thicknesses δ ₁ and δ ₂ of the housing 20 are both greater than or equal to 2 mm.

Based on the spray-free base described in any of the foregoing embodiments, the present disclosure provides some embodiments of a method for preparing the spray-free base.

As shown in FIG. 6, a method for preparing a spray-free base of the present disclosure includes the following steps:

Step S100, preparing a metal insert and placing the metal insert in the mold for positioning.

Specifically, the step S100 includes:

In step S110, a hole is made on the surface of the metal sheet to obtain a metal insert.

The metal sheet can be iron sheet, copper sheet or aluminum sheet. Among them, aluminum alloy sheets are used, which have high structural strength and light weight. A through hole is opened on the metal sheet to obtain a metal insert, and a V-shaped metal sheet is used for the metal sheet to obtain a V-shaped metal insert.

Considering the comprehensive cost and strength of metal inserts, electro-galvanized steel (SECC) materials are selected, and metal inserts are obtained by stamping.

Step S120: Set a fixing part in the mold, and fix the metal insert on the fixing part.

The fixing part can be cylindrical or cubic column shape, one end of the fixing part is connected with the bottom of the mold, and the other end is detachably connected with the bottom end of the metal insert.

After the metal insert is fixed on the fixing piece, the distance between the metal insert and the inner wall of the mold is ≥ 2 mm.

In step S200, the metal powder is blended with the base material and then granulated to obtain the base metal powder material.

The metal powder is one or more of aluminum powder, iron powder or copper powder, the substrate is one or more of ABS, PC, PMMA, and PA, and the particle size of the metal powder is ≤20 μm, The mass fraction of the metal powder in the base metal powder material is 0.5-1 wt%.

More specifically, the base material is ABS, and the metal powder is aluminum powder. Based on the total mass of ABS and metal powder, the mass fraction of aluminum powder is 0.5-1wt%, and the particle size of aluminum powder is less than or equal to 20μm. , Extrusion and granulation through a twin-screw extruder, and finally obtain ABS metal powder material. The metal powder material of the base material will produce flow marks on the bottom or inside of the base during the injection and filling process, and the flow marks can be masked by etching.

In step S300, the base metal powder material is injected into the mold to form the shell 20 that wraps the metal insert, and then demolded to obtain the spray-free base.

After demoulding, remove the base from the fixing part to obtain the spray-free base. Of course, after injection molding, it needs to be pressure-maintained and cooled before demolding, and then take out the spray-free base. Because the thermal conductivity of the metal powder and the metal insert is better, the temperature difference of each part during the cooling process will not be too large. The formed substrate is more uniform, and there is no problem of low strength in some positions caused by uneven substrate.

It is worth noting that the spray-free base of the present disclosure has the following effects:

1) The metal powder material of the base material and the mold's etching effect can be directly injection molded to obtain a metallic appearance effect, eliminating the need for post-treatment processes such as spraying, and meeting the design requirements of green products. As a result, it solves the problem that the spray-free materials on the market have limited strength, cannot meet the strength requirements of the TV base, and can only provide appearance effects.

2) The metal insert can provide strength requirements for the large-size TV base, and as a product insert, it does not require appearance requirements, eliminating post-processing techniques and corresponding costs.

3) The present disclosure focuses on the two major advantages of the strength of the metal insert and the metallic appearance of the spray-free material, which combines their respective advantages and applies them to products. Therefore, the spray-free injection molding base for metal inserts can not only meet the experimental strength requirements of the whole machine, but also achieve the appearance effect of metal texture. Through direct injection molding, a TV base with a metal appearance texture can be obtained.

In summary, the present disclosure provides a spray-free base and a preparation method thereof. The method includes the following steps: preparing a metal insert and placing the metal insert in a mold for positioning; After blending, granulation is performed to obtain a base metal powder material; the base metal powder material is injected into the mold to form a shell that wraps the metal insert, and then demolded to obtain the spray-free base. In the present disclosure, a shell is arranged on the basis of a metal insert. After the metal powder and the base material are mixed to form the shell, the surface of the shell presents a metallic texture and does not require additional polishing and painting. Moreover, the metal insert has higher strength, so that the spray-free base has higher strength and is not easily damaged.

It should be understood that the application of the present disclosure is not limited to the above examples. For those of ordinary skill in the art, improvements or changes can be made based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present disclosure.

Claims

A method for preparing a spray-free base, which includes the following steps:

Preparing a metal insert and placing the metal insert in the mold for positioning;

The metal powder is blended with the base material and then granulated to obtain the base metal powder material;

The base metal powder material is injected into the mold to form a shell that wraps the metal insert, and then demolded to obtain the spray-free base.
The method for preparing a spray-free base according to claim 1, wherein the step of preparing a metal insert and placing the metal insert in a mold for positioning comprises:

Drill holes on the surface of the metal sheet to obtain a metal insert;

A fixing part is arranged in the mold, and the metal insert is fixed on the fixing part.
The method for preparing a spray-free base according to claim 1, wherein in the step of positioning the metal insert in the mold, the distance between the metal insert and the inner wall of the mold is ≥ 2 mm.
The method for preparing a spray-free base according to claim 1, wherein the metal powder is one or more of aluminum powder, iron powder or copper powder.
The method for preparing a spray-free base according to claim 1, wherein the substrate is one of acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, and polyamide Or multiple.
The method for preparing a spray-free base according to claim 1, wherein the particle size of the metal powder is ≤ 20 μm.
The method for preparing a spray-free base according to claim 1, wherein the mass fraction of the metal powder in the base metal powder material is 0.5-1 wt%.
A spray-free base, which includes:

Metal insert

A shell wrapped around the metal insert, the shell comprising:

Substrate

Metal powder dispersed in the substrate;

Wherein, the shell is formed by injection molding.
The spray-free base according to claim 8, wherein a connecting plate for connecting with the supported object is provided on the housing, and the connecting plate is integrally formed with the housing.
The spray-free base according to claim 9, wherein the connecting plate is provided with a screw hole, and the screw hole can pass through the screw to fix the supported object to the connecting plate.
The spray-free base of claim 9, wherein the connecting plate comprises a connecting plate insert, and the connecting plate insert is connected to the metal insert.
The spray-free base according to claim 9, wherein the bottom of the casing is provided with a through hole of a fixing member.
The spray-free base according to claim 12, wherein the cross section of the casing is trapezoidal, the connecting plate is located at the upper bottom of the trapezoidal casing, and the through hole of the fixing member is located at the lower bottom of the trapezoidal casing.
The spray-free base of claim 8, wherein the metal insert is a V-shaped metal insert.
The spray-free base of claim 14, wherein the V-shaped metal insert is an obtuse-angled V-shaped metal insert.
The spray-free base according to claim 8, wherein the thickness of the shell is ≥ 2mm.
The spray-free base according to claim 8, wherein the surface of the metal insert is provided with through holes.
The spray-free base of claim 8, wherein the substrate is one or more of acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, and polyamide .
The spray-free base according to claim 8, wherein the particle size of the metal powder is ≤ 20 μm.
The spray-free base according to claim 8, wherein the mass fraction of the metal powder in the shell is 0.5-1 wt%.