阅读说明：本技术 3d玻璃硬质合金模具及其制作方法 (3D glass hard alloy die and manufacturing method thereof ) 是由 张月皎 罗恺 何海波 张迪钧 李军旗 于 2018-09-06 设计创作，主要内容包括：本发明提出一种3D玻璃硬质合金模具的制作方法,其包括以下步骤：提供一硬质合金模具坯料；将所述硬质合金模具坯料放入反应室内,并排除其中空气；对所述反应室进行升温,并还原所述硬质合金模具坯料模腔内表面的氧化物；通入含碳气体；及通入需沉积物质的卤化物气体,使其与含碳气体在所述硬质合金模具坯料模腔内表面发生反应沉积,从而形成沉积层,得到所述3D玻璃硬质合金模具。本发明还提出一种3D玻璃硬质合金模具。(The invention provides a manufacturing method of a 3D glass hard alloy die, which comprises the following steps: providing a hard alloy die blank; placing the hard alloy die blank into a reaction chamber and exhausting air in the reaction chamber; heating the reaction chamber, and reducing the oxide on the inner surface of the die cavity of the hard alloy die blank; introducing carbon-containing gas; and introducing halide gas of a substance to be deposited, and enabling the halide gas and carbon-containing gas to react and deposit on the inner surface of the blank die cavity of the hard alloy die so as to form a deposition layer and obtain the 3D glass hard alloy die. The invention further provides a 3D glass hard alloy die.)

1. A manufacturing method of a 3D glass hard alloy mold comprises the following steps:

providing a hard alloy die blank;

placing the hard alloy die blank into a reaction chamber and exhausting air in the reaction chamber;

heating the reaction chamber, and reducing the oxide on the inner surface of the die cavity of the hard alloy die blank;

introducing carbon-containing gas; and

and introducing halide gas of a substance to be deposited, and reacting and depositing the halide gas and carbon-containing gas on the inner surface of the blank die cavity of the hard alloy die to form a deposition layer, thereby obtaining the 3D glass hard alloy die.

2. The method of making a 3D glass-cemented carbide mold of claim 1, wherein: the method also comprises the step of pretreating the inner surface of the die cavity of the hard alloy die blank before the step of placing the hard alloy die blank into the reaction chamber and exhausting air in the reaction chamber.

3. The method of making a 3D glass-cemented carbide mold of claim 1, wherein: the hard alloy die blank can be made of one of WC-Co alloy, WC-TiC-TaC-Co alloy, tungsten carbide base alloy and titanium carbide base alloy.

4. The method of making a 3D glass-cemented carbide mold of claim 1, wherein: the step of forming the deposition layer comprises the steps of taking hydrogen as a carrier, introducing halide gas of a substance to be deposited, enabling the halide gas and carbon-containing gas to react and deposit on the inner surface of the die cavity of the hard alloy die blank, and keeping the proportion and the total pressure of the hydrogen and the carbon-containing gas or linearly adjusting the proportion and the total pressure of the hydrogen and the carbon-containing gas with time, thereby forming the carbon or carbide deposition layer with fixed components or gradient change.

5. The method of making a 3D glass-cemented carbide mold of claim 1, wherein: after the step of forming the deposition layer, the method also comprises the step of cooling.

6. The utility model provides a 3D glass carbide mould which characterized in that: the 3D glass hard alloy die comprises an upper die plate and a lower die plate which are matched with each other, a die cavity formed by the upper die plate and the lower die plate is used for forming 3D glass during machining, the upper die plate and the lower die plate are made of alloy, a deposition layer is at least formed on the inner surface of the die cavity by the upper die plate and the lower die plate, and the deposition layer is mainly carbon or carbide.

7. The 3D glass-cemented carbide mold of claim 6, wherein: the upper template and the lower template are made of the same material.

8. The 3D glass-cemented carbide mold of claim 6, wherein: the deposited layers are formed on the contact surfaces of the upper template and the lower template.

9. The 3D glass-cemented carbide mold of claim 6, wherein: the composition of the deposited layer is fixed or varies in a gradient.

10. The 3D glass-cemented carbide mold of claim 6, wherein: the upper template and the lower template are made of one of WC-Co alloy, WC-TiC-TaC-Co alloy, tungsten carbide base alloy and titanium carbide base alloy.

Technical Field

The invention relates to a 3D glass mold, in particular to a 3D glass hard alloy mold and a manufacturing method thereof.

Background

Because of the unique properties of the 3D glass material, the 3D glass is widely applied to the field of electronic products such as mobile phones, flat plates and the like, at present, the graphite mold is mainly used for forming the 3D glass, and the graphite mold has a thermal expansion coefficient similar to that of the glass and does not react with the glass at high temperature. The graphite material is a porous material, and the porous structure of the graphite material can cause concave-convex points, pockmarks and the like on the surface of the glass during molding, thereby reducing the appearance quality and yield. Meanwhile, the graphite material is very easy to be oxidized and scratched, and the service life is short, so that the cost of the die is too high. The hard alloy has high density, no obvious pores on the surface of the material, oxidation resistance and excellent performance, and can be used as a substitute of a graphite mold in the field of 3D glass. However, cemented carbide materials are likely to react with glass at high temperatures, resulting in the formation of a sticky film.

Disclosure of Invention

In view of the above, there is a need for a method for manufacturing a 3D glass cemented carbide mold that can solve the above problems.

The 3D glass hard alloy die manufactured by the manufacturing method is also provided.

A manufacturing method of a 3D glass hard alloy mold comprises the following steps: providing a hard alloy die blank; placing the hard alloy die blank into a reaction chamber and exhausting air in the reaction chamber; heating the reaction chamber, and reducing the oxide on the inner surface of the die cavity of the hard alloy die blank; introducing carbon-containing gas; and introducing halide gas of a substance to be deposited, and enabling the halide gas and carbon-containing gas to react and deposit on the inner surface of the blank die cavity of the hard alloy die so as to form a deposition layer and obtain the 3D glass hard alloy die.

The utility model provides a 3D glass carbide mould, 3D glass carbide mould includes cope match-plate pattern and the lower bolster of mutually supporting, the die cavity that cope match-plate pattern and lower bolster formed jointly is used for adding man-hour shaping 3D glass, the cope match-plate pattern with the lower bolster adopts the alloy to make, the cope match-plate pattern with the lower bolster is formed with a sedimentary deposit on the die cavity internal surface at least, the sedimentary deposit mainly is carbon or carbide.

According to the 3D glass hard alloy mold, the carbon or carbide deposition layer is formed on the inner surface of the hard alloy mold cavity in a chemical vapor deposition mode, so that the hard alloy material can be used as a 3D glass forming mold, the defect that graphite is used as the forming mold is overcome, and the cost is low.

Drawings

Fig. 1 is a perspective view of a 3D glass cemented carbide mold in one embodiment of the invention.

FIG. 2 is a flow chart of the method for manufacturing the 3D glass cemented carbide mold of the present invention.

Description of the main elements

3D glass carbide die	100
		Upper template	10
Lower template	20

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present invention provides a 3D glass cemented carbide mold 100 for molding 3D glass. The 3D glass cemented carbide mold 100 includes an upper mold plate 10 and a lower mold plate 20 that are fitted to each other. The upper mold plate 10 and the lower mold plate 20 together form a mold cavity for molding 3D glass during processing.

The upper template 10 and the lower template 20 are made of alloy with the same material. Preferably, the upper and lower templates 10 and 20 are made of an alloy having a thermal expansion coefficient similar to that of 3D glass and no significant pores on the surface of the material.

Specifically, the upper mold plate 10 and the lower mold plate 20 may be made of one of WC-Co (or referred to as WC-Co), WC-TiC-Co (or referred to as WC-ti-Co), WC-TiC-tac (nbc) -Co, WC-based alloy, and WC-based alloy, which have thermal expansion coefficients centered at 4.5 to 7.4 × 10 "6/° c, according to the 3D glass to be formed.

For example, when the processing structure is complex and 3D glass with high impact pressure is needed, the tungsten-cobalt alloy is suitable for being used. The composite material mainly comprises tungsten carbide and cobalt, wherein other carbides (tantalum carbide, niobium carbide, vanadium carbide and the like) with the content of less than 2% are added as additives, and the content of the cobalt is 3-30%. And the high cobalt alloy with 20-30% cobalt content is suitable for 3D glass forming die materials with high impact pressure.

The tungsten titanium cobalt alloy contains 4-40% of titanium carbide and 4-15% of cobalt, and compared with the tungsten cobalt alloy, the tungsten titanium cobalt alloy has higher oxidation resistance and longer service life, but has weaker impact resistance, and is more suitable for being used as a 3D glass mold with a simpler structure.

The NbC-Co alloy comprises 5-15% of titanium carbide, 2-10% of tantalum carbide (niobium carbide), 5-15% of cobalt and the balance of tungsten carbide. Compared with tungsten-titanium-cobalt alloy, the alloy has better high-temperature oxidation resistance and better thermal shock resistance, and is suitable for high forming temperature (650-1000 ℃) and frequent cold and hot impact (the high-temperature to room temperature conversion within 15-50 min).

The tungsten carbide-based alloy and the titanium carbide-based alloy consist of tungsten carbide or titanium carbide and carbon steel or alloy steel. The annealing has higher cutting processing performance compared with other alloys. And the raw material price is low, the manufacturing process is simple, the processing cost is low, and the cost is lower.

The upper mold plate 10 and the lower mold plate 20 are subjected to a surface treatment process at least on the inner surface of the mold cavity to form a deposition layer. Preferably, the contact surfaces of the upper template 10 and the lower template 20 are both subjected to surface treatment to form a deposition layer. The deposition layer has high temperature resistance and thermal shock resistance, and does not react with glass at high temperature. In particular, the deposit is primarily carbon or carbide. The carbon or carbide as a deposition layer can bear the high temperature of 650-1000 ℃, can still keep good bonding force with the hard alloy under frequent high-low temperature conversion, and the deposition layer can not be adhered to the glass after the glass is formed.

Referring to fig. 2, the present invention further provides a method for manufacturing a 3D glass cemented carbide mold by Chemical Vapor Deposition (CVD), which comprises the following steps:

in step S1, a cemented carbide mold blank is provided. The hard alloy mold blank comprises an upper template 10 and a lower template 20 which are matched with each other, and a mold cavity formed by the upper template 10 and the lower template 20 is used for molding 3D glass during machining.

Step S2, the inner surface of the cavity of the cemented carbide mold blank is pretreated. Specifically, the contact surface between the upper mold plate 10 and the lower mold plate 20 and the inner surface of the mold cavity formed on the contact surface are polished, cleaned, and dried.

And step S3, placing the cleaned hard alloy die blank into a reaction chamber, and removing air in the reaction chamber. Specifically, the upper template 10 and the lower template 20 are placed in a reaction chamber of an induction furnace, and vacuum pumping is performed until the pressure is below 1 Pa.

And step S4, heating the reaction chamber, and reducing the oxide on the inner surface of the die cavity of the hard alloy die blank. Specifically, the upper template 10 and the lower template 20 are heated to a temperature above 1000 ℃, and dry hydrogen is introduced into the reaction chamber to reduce oxides on the contact surface of the upper template 10 and the lower template 20 and the inner surface of the mold cavity.

And step S5, introducing carbon-containing gas. Specifically, methane is introduced into the reaction chamber, and the air pressure in the reaction chamber is maintained at 1-2 kPa for 1-3 h.

And step S6, introducing halide gas of the substance to be deposited, and reacting the halide gas with the carbon-containing gas to deposit on the inner surface of the cavity of the mold, thereby forming a deposited layer.

Specifically, hydrogen is used as a carrier, and halide gas such as SiCl4, TiCl4 and the like of a substance to be deposited is introduced, so that the halide gas and the methane gas are subjected to reaction deposition on the contact surface of the upper template 10 and the lower template 20 and the inner surface of the mold cavity, and the reaction time is about 5-20 hours. The thickness of the deposited layer is increased along with the prolonging of the reaction time, the ratio of the hydrogen to the methane gas and the total pressure are kept, or the ratio of the hydrogen to the methane gas and the total pressure are linearly adjusted along with the time, so that the carbon or carbide deposited layer with fixed components or gradient change is formed.

And step S7, cooling. Specifically, after the deposition is finished, the temperature in the reaction chamber and the hydrogen atmosphere are maintained for a period of time, and then the mold is gradually cooled as the temperature in the reaction chamber decreases, thereby obtaining the 3D glass cemented carbide mold 100 containing the desired deposition layer.

According to the 3D glass hard alloy mold 100, the carbon or carbide deposition layer is formed on the inner surface of the hard alloy mold cavity in a chemical vapor deposition mode, so that the hard alloy material can be used as a 3D glass forming mold, the defect that graphite is used as the forming mold is overcome, and the cost is low.

In addition, other modifications within the spirit of the invention may occur to those skilled in the art, and such modifications are, of course, included within the scope of the invention as claimed.