CN210349557U

CN210349557U - Wet pressing tile-shaped magnet die with DLC coating

Info

Publication number: CN210349557U
Application number: CN201920794830.4U
Authority: CN
Inventors: 范玉山; 黄桃
Original assignee: Suzhou Denai Nano Technology Co Ltd
Current assignee: Suzhou Denai Nano Technology Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-04-17
Anticipated expiration: 2029-05-30

Abstract

The utility model relates to a wet pressing tile-shaped magnet mould with DLC coating, which is characterized in that the DLC coating is arranged on the molding surface of the mould, so that the demoulding liquid can be used as 1/6, and the use of the demoulding liquid can be directly cancelled for some products; and the scrappage ratio of the green embryo is reduced to 0.001 percent from 0.15 to 0.2 percent; the service life of the die is prolonged by 2 times, the surface precision of the product is obviously improved, the subsequent surface shaping of the finished product can be partially cancelled, and the cost is greatly reduced.

Description

Wet pressing tile-shaped magnet die with DLC coating

Technical Field

The utility model relates to a take wet pressure tile shape magnet mould of DLC coating.

Background

At present, in the use process of a common wet-pressed tile-shaped magnet mold, magnetic powder which is almost invisible to naked eyes is adhered to the wall of an inner cavity of the mold, the surface of a mold core and the side surface of the mold core, so that the demolding force is not uniform, the inside of a product is layered by stress, and the product has the risk of cracking in the subsequent sintering process.

At present, in order to solve the problems of poor finished products and die abrasion caused by bonding magnetic powder to a die, die materials are replaced for a lower die, 50Mn, 60Mn and stainless steel are changed into hard alloy, and the cost is increased by 4-5 times; but the upper die and the die core can not be replaced by materials and can only be repaired repeatedly until being scrapped.

In addition, in order to reduce adhesion, each die is coated with a stripping liquid during each molding, the stripping liquid is not environment-friendly, and the adhesion is more and more obvious with the increase of the number of dies, so that the die is pulled, the surface of a product is not smooth, and the product is seriously poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a take wet pressing tile shape magnet mould of DLC coating in order to overcome prior art not enough.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the wet pressing tile-shaped magnet die with the DLC coating comprises a die body, wherein a non-magnetic material layer is arranged on the forming surface of the die body.

Preferably, the mould body contains mould, lower mould and mold core post, goes up the mould and has the die cavity, and the lower mould has the die cavity, and the top of mold core post has the shaping pressure head.

Preferably, a non-magnetic material layer is arranged on the inner wall of the cavity.

Preferably, a non-magnetic material layer is arranged on the inner wall of the die cavity.

Preferably, a non-magnetic material layer is arranged on the outer surface of the forming pressure head.

Preferably, the nonmagnetic material layer comprises a DLC coating and a transition layer, the mold is provided with a base material layer, and the DLC coating is attached to the base material layer through the transition layer.

Preferably, the DLC coating is a single-material coating or a composite coating of a plurality of combinations of Si-DLC, Cr-DLC, W/WC-DLC, Ti/DLC and ta-C containing silicon, chromium, tungsten and titanium.

Preferably, the transition layer is Cr_xW_yNzcn or a mixed gradient layer of Si/SiC, where x + y ≈ z + n,0 ≦ x ≦ 1,0 ≦ z ≦ 1.

Preferably, the DLC coating and the transition layer have a total thickness of 1 to 5 microns.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

according to the scheme, the DLC coating is arranged on the molding surface of the mold, so that the demolding liquid can be used as 1/6, and the use of the demolding liquid can be directly cancelled for some products; and the scrappage ratio of the green embryo is reduced to 0.001 percent from 0.15 to 0.2 percent; the service life of the die is prolonged by 2 times, the surface precision of the product is obviously improved, the subsequent surface shaping of the finished product can be cancelled, and the cost is greatly reduced.

Drawings

The technical scheme of the utility model is further explained by combining the attached drawings as follows:

FIG. 1 is a schematic structural view of a wet pressed tile-shaped magnet mold with DLC coating according to the present invention;

fig. 2 is a schematic view of a lower die of the present invention;

fig. 3 is a schematic view of the attachment structure of the non-magnetic material layer of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-2, the wet pressed tile-shaped magnet mold with DLC coating according to the present invention comprises an upper mold 11, a lower mold 12 and a mold core column 13, wherein the upper mold 11 has a cavity 2, the lower mold 12 has a mold cavity 3, and the top end of the mold core column 13 has a forming press head 4; and the inner walls of the die cavity 2 and the die cavity 3 and the outer surface of the forming pressure head 4 are provided with nonmagnetic material layers 1.

As shown in fig. 3, the nonmagnetic material layer 1 comprises a DLC coating 35 and a transition layer 36, the DLC coating 35 is attached to a mold base 37 through the transition layer 36, and the surfaces of the upper mold 11 and the mold base 37 of the core post 13 have a nitrided or carbonitrided layer; the total thickness of the DLC coating 35 and the transition layer 36 is 1-5 microns, but not including the thickness of the casting or welding, and the thickness of the nitride or carbonitrided layer; the DLC coating 35 is a single material coating or a composite coating of a plurality of materials selected from Si-DLC, Cr-DLC, W-DLC, Ti/DLC and ta-C containing silicon, chromium, tungsten and titanium, and the transition layer 36 is Cr_xW_yNzcn or a mixed gradient layer of Si/SiC, where x + y ≈ z + n,0 ≦ x ≦ 1,0 ≦ z ≦ 1.

The DLC coating mold has a very low surface friction coefficient of about 0.04-0.12, the magnetic powder is hardly adhered to the mold in the production process, demolding is smooth, the mold is slightly abraded, and the service life is prolonged.

When the die works, the upper die 11 and the lower die 12 are closed, water-added powder is injected into the die cavity 3, the die core columns 13 enter the die cavity to apply pressure, and the die is released after the steps of water extrusion, powder magnetization for fixing the magnetization direction, sintering, demagnetization and the like.

Wherein the upper die 11 and the die core column 13 are made of magnetic conductive materials, and can adopt No. 45 steel, but are not limited to No. 45 steel; in the figure, the mold takes 6 cavities as an example, and the shape and the number of the mold cavities of the actual mold can be selected according to actual requirements; the covering positions of the non-magnetic material layer 1 are not limited to the mold cavity 3, the mold core columns 13 and the molding press head 4, and other positions of the mold can be covered according to actual needs.

The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. The utility model provides a take wet pressing tile shape magnet mould of DLC coating, contains the mould body, its characterized in that: a non-magnetic material layer (1) is arranged on the molding surface of the mold body; the nonmagnetic material layer (1) comprises a DLC coating (35) and a transition layer (36), and the DLC coating (35) is attached to the die through the transition layer (36).

2. The DLC-coated wet pressed tile-shaped magnet mold according to claim 1, wherein: the mould body contains mould (11), lower mould (12) and mold core post (13), goes up mould (11) and has die cavity (2), and lower mould (12) have die cavity (3), and the top of mold core post (13) has shaping pressure head (4).

3. The DLC-coated wet pressed tile-shaped magnet mold according to claim 2, wherein: and a non-magnetic material layer (1) is arranged on the inner wall of the cavity (2).

4. The DLC-coated wet pressed tile-shaped magnet mold according to claim 2, wherein: and a non-magnetic material layer (1) is arranged on the inner wall of the die cavity (3).

5. The DLC-coated wet pressed tile-shaped magnet mold according to claim 2, wherein: and a non-magnetic material layer (1) is arranged on the outer surface of the forming pressure head (4).

6. The DLC-coated wet pressed tile-shaped magnet mold according to claim 1, wherein: the transition layer (36) is Cr_xW_yNzcn or a mixed gradient layer of Si/SiC.

7. The DLC-coated wet pressed tile-shaped magnet mold according to claim 1, wherein: the total thickness of the DLC coating (35) and the transition layer (36) is 1-5 microns.