CN215315603U

CN215315603U - Composite coating of die-casting die

Info

Publication number: CN215315603U
Application number: CN202022819606.1U
Authority: CN
Inventors: 张铁成
Original assignee: Dongguan Jinsheng Nanotechnology Co ltd
Current assignee: Dongguan Jinsheng Nanotechnology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-12-28
Anticipated expiration: 2030-11-30

Abstract

The utility model relates to a composite coating of a die-casting die, which comprises a base layer and a plurality of coating layers, wherein the base layer is attached to the inner wall of a die cavity; the base layer is provided with a superhard PVD layer; a porous oxidation coating is compounded in the superhard PVD layer; the surface layer is provided with a demolding layer and a bonding layer; the bonding layer is used for connecting the superhard PVD layer and the demolding layer. According to the utility model, the base layer is coated on the base layer by the PVD technology, and the porous base layer can play a good degassing function while the service life of the hard alloy die and the product quality are improved by combining the superhard PVD layer and the porous oxide coating. Meanwhile, the surface layer is coated on the surface of the base layer, so that a larger contact area is provided for the molten material, and the stripping capability is improved.

Description

Composite coating of die-casting die

Technical Field

The utility model relates to a composite coating, in particular to a composite coating of a die-casting die, and belongs to the technical field of die manufacturing.

Background

Different casting methods follow a general casting process flow, firstly, aluminum alloy solution is refined and purified, then molten metal is poured into a mold through different pouring systems and injection methods, in the prior art, the purification of the aluminum alloy can be performed in a smelting furnace, can be performed in a holding furnace or a crucible of a low-pressure casting machine, and can also be performed by placing filters at a plurality of positions of a pouring ladle, a hopper and a pouring gate to repeatedly degas and purify the aluminum alloy solution, some casting methods such as low-pressure casting are that the aluminum alloy solution is melted in the holding furnace or the crucible and directly enters a mold cavity through a riser tube under many conditions, and degassing and purifying conditions are limited. PVD, physical vapor deposition, refers to a technique in which a material is evaporated into gaseous atoms, molecules or parts thereof ionized into ions by a physical method under vacuum, and a thin film having a specific function is deposited on the surface of a substrate by a low-pressure gas. Because the coating formed by adopting the PVD technology has strong functionality, the coating can play the roles of impurity removal, degassing and demolding assistance in the die casting process through the characteristic.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims to overcome the defects in the prior art and provide a composite coating for a die-casting die, which improves the production efficiency, improves the product quality, and considers the properties of hardness, high temperature resistance and the like.

A composite coating of a die-casting die comprises base layers which are attached to the inner wall of a die cavity, wherein the surface of the base layer is covered with a surface layer; the base layer is provided with a superhard PVD layer; a porous oxidation coating is compounded in the superhard PVD layer; the surface layer is provided with a demolding layer and a bonding layer; the bonding layer is used for connecting the superhard PVD layer and the demolding layer.

Preferably, the superhard PVD layer is a TiAlN/CrN nano multilayer composite coating; the thickness of the superhard PVD layer is 0.5-5 mu m.

Preferably, the porous composite oxide coating is filled with iron oxide particles.

Preferably, the particle size of the iron oxide particles is between 5 and 10 um; the pore diameter in the porous composite oxidation coating is between 1 and 3 mu m.

Preferably, the bonding layer is a chromium nitride coating.

Preferably, the release layer is made of sodium chloride and potassium chloride; the thickness of the demoulding layer is between 0.5 and 0.8 mm; the demoulding layer is sprayed on the inner wall of the mould cavity.

Preferably, a graphite filling layer is further arranged in the demoulding layer.

According to the utility model, the base layer is coated on the base layer by the PVD technology, and the porous base layer can play a good degassing function while the service life of the hard alloy die and the product quality are improved by combining the superhard PVD layer and the porous oxide coating. Meanwhile, the surface layer is coated on the surface of the base layer, so that a larger contact area is provided for the molten material, and the stripping capability is improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of the present invention.

FIG. 2 is a schematic cross-sectional view of a porous oxide coating in accordance with the present invention.

In the figure, 1 is a base layer, 1.1 is a superhard PVD layer, 1.2 is a porous oxide coating, 2 is a surface layer, 2.1 is a release layer, and 2.2 is a bonding layer.

Detailed Description

The technical solutions in the novel embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the novel embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the novel embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the novel concept, are within the scope of the novel protection of the present invention.

Terms used herein, including technical and scientific terms, have the same meaning as terms commonly understood by one of ordinary skill in the art, unless otherwise defined. It will be understood that terms defined in commonly used dictionaries have meanings that are consistent with their meanings in the prior art.

Referring to fig. 1, a composite coating of a die casting mold comprises base layers attached to the inner wall of a mold cavity, wherein the surface of the base layer is covered with a surface layer; the base layer is provided with a superhard PVD layer; a porous oxidation coating is compounded in the superhard PVD layer; the surface layer is provided with a demolding layer and a bonding layer; the bonding layer is used for connecting the superhard PVD layer and the demolding layer.

Further, the superhard PVD layer is a TiAlN/CrN nano multilayer composite coating; the thickness of the superhard PVD layer is 0.5-5 mu m.

In the present embodiment, the first TiAlN/CrN nano-multilayer may include heat-resistant components (e.g., TiAl and Cr) to provide excellent heat resistance. Also, TiAlN and CrN may be alternately coated on the CrN or ti (c) N bonding layer in a multi-layer form to provide oxidation resistance and excellent toughness. The TiAlN and CrN nanolayers may be alternately coated to form a total thickness of about 0.5 μm to about 5 μm.

Furthermore, the porous composite oxide coating is filled with iron oxide particles.

Furthermore, the particle size of the iron oxide particles is between 5 and 10 nm; the pore diameter in the porous composite oxidation coating is between 1 and 3 mu m.

Further, the bonding layer is a chromium nitride coating.

In this embodiment, the bonding layer may be coated on the surface of the base layer in a PVD manner with a preferred thickness of 2.5 μm, and in order to reduce residual stress between the base layer and the surface layer, the bonding layer may be coated between gases with a smaller thickness.

Further, the demoulding layer is made of sodium chloride and potassium chloride; the thickness of the demoulding layer is between 0.5 and 0.8 mm; the demoulding layer is sprayed on the inner wall of the mould cavity.

In this embodiment, it is preferable to form a mold release layer by using aF, CaF2 and other elements in addition to the above-mentioned sodium chloride and potassium chloride, and to control the thickness of the coating layer to about 0.6mm, so that the alloy melt can be well resistant to heat fusion and washing immediately after flowing into the cavity, and the degassing and impurity removal effects can be ensured, and the alloy melt can be washed and floated on the top of the cavity immediately after being separated from the inner wall of the cavity by the heat fusion and washing effects of the aluminum alloy melt.

Furthermore, a graphite filling layer is arranged in the demoulding layer.

Finally, the above embodiments are only intended to illustrate the novel technical solutions of the present invention and not to limit the same, and although the novel technical solutions of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the novel technical solutions of the present invention without departing from the spirit and scope of the novel technical solutions of the present invention, and all of the modifications and equivalent substitutions are intended to be included within the scope of the claims of the present invention.

Claims

1. The utility model provides a die casting die composite coating, includes the basic unit that all adheres to die cavity inner wall, its characterized in that: the surface of the base layer is covered with a surface layer; the base layer is provided with a superhard PVD layer; a porous oxidation coating is compounded in the superhard PVD layer; the surface layer is provided with a demolding layer and a bonding layer; the bonding layer is used for connecting the superhard PVD layer and the demolding layer.

2. A die casting mold composite coating as claimed in claim 1, wherein: the thickness of the superhard PVD layer is 0.5-5 mu m.

3. A die casting mold composite coating as claimed in claim 1, wherein: the pore diameter in the porous oxidation coating is between 1 and 3 mu m.

4. A die casting mold composite coating as claimed in claim 1, wherein: the bonding layer is a chromium nitride coating.

5. A die casting mold composite coating as claimed in claim 1, wherein: the thickness of the demoulding layer is between 0.5 and 0.8 mm; the demoulding layer is sprayed on the inner wall of the mould cavity.

6. A die casting mold composite coating as claimed in claim 1, wherein: and a graphite filling layer is also arranged in the demoulding layer.