Magnetic adsorption type diamond compact

Abstract

The utility model relates to the field of diamond compacts, and discloses a magnetic adsorption type diamond compact which comprises a hard alloy layer, the upper end face of the hard alloy layer is connected with a diamond layer through ultrahigh-pressure high-temperature sintering, and a permanent magnet is fixedly arranged on the lower end face of the hard alloy layer. Three protruding edges are fixedly arranged on the upper end face of the diamond layer, three chip grooves are formed in the upper end face of the diamond layer, protective layers are arranged on the outer wall of the hard alloy layer and the outer wall of the permanent magnet, and each protective layer comprises an anti-oxidation layer and an anti-abrasion layer. According to the diamond cutting device, rock fragments during cutting can be drained, the rock fragments are prevented from staying on the surface of the diamond and rubbing the diamond continuously, and the phenomenon that the service life of the hard alloy layer is shortened due to long-term contact between the hard alloy layer and the rock fragments and the fragments can be prevented.

Description

Technical Field

[0001] This utility model relates to the field of diamond composite sheets, and more particularly to a magnetically adsorbed diamond composite sheet. Background Technology

[0002] Diamond composite sheets are made by sintering diamond micro powder and cemented carbide substrate under ultra-high pressure and high temperature conditions. They have the high hardness, high wear resistance and thermal conductivity of diamond, as well as the strength and impact toughness of cemented carbide. They are ideal materials for manufacturing cutting tools, drilling bits and other wear-resistant tools.

[0003] In the process of developing this application, the inventors discovered the following problems with the prior art:

[0004] In existing technologies, diamond composite sheets typically make direct contact with the rock through the diamond facet at their tip when cutting rocks. During the cutting process, broken rock fragments remain on the diamond surface. The continuous friction between the rock fragments and the diamond surface during the breaking and cutting process affects the structural stability of the diamond layer. Furthermore, in existing technologies, the cemented carbide layer is relatively fragile compared to the diamond layer. Therefore, prolonged contact with splashed rock fragments and debris during actual use will accelerate the wear rate of the cemented carbide layer.

[0005] Therefore, those skilled in the art have provided a magnetically adsorbed diamond composite sheet to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a magnetically adsorbed diamond composite sheet that can guide rock fragments during cutting, preventing them from remaining on the diamond surface and rubbing against it continuously. It also prevents the cemented carbide layer from experiencing a reduction in its service life due to prolonged contact with rock fragments and debris.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A magnetically adsorbed diamond composite sheet includes a cemented carbide layer, a diamond layer connected to the upper surface of the cemented carbide layer by ultra-high pressure and high temperature sintering, a permanent magnet fixedly disposed on the lower surface of the cemented carbide layer, three protruding ridges fixedly disposed on the upper surface of the diamond layer, three chip removal grooves formed on the upper surface of the diamond layer, and a protective layer disposed on the outer wall of both the cemented carbide layer and the permanent magnet, the protective layer including an anti-oxidation layer and an anti-wear layer.

[0009] Furthermore, the lower end face of the diamond layer is provided with multiple slots, and the upper end face of the cemented carbide layer is fixedly provided with multiple protrusions, which are respectively embedded in the multiple slots.

[0010] Furthermore, the upper surfaces of the three protruding ridges are all set as arc surfaces, and the three chip removal grooves are interconnected.

[0011] Furthermore, the two antioxidant layers are respectively fixedly disposed on the outer wall of the hard alloy layer and the permanent magnet body, and the two wear-resistant layers are respectively fixedly disposed on the outer wall of the two antioxidant layers.

[0012] Furthermore, the anti-oxidation layer is a nickel alloy electroplating layer with a nickel content greater than 99%, and the wear-resistant layer is an aluminum chromium nitride plating layer.

[0013] This utility model has the following beneficial effects:

[0014] 1. The present invention proposes a magnetic adsorption type diamond composite sheet, which can effectively improve the wear resistance of the permanent magnet surface and the hard alloy layer surface through the wear-resistant layer on the surface of the hard alloy layer and the permanent magnet surface. In addition, during the chromium plating process, the anti-oxidation layer can prevent the chromium plating liquid from corroding the permanent magnet, thereby improving the wear resistance of the permanent magnet and the hard alloy surface without significantly weakening the magnetic force of the permanent magnet.

[0015] 2. The present invention proposes a magnetic adsorption type diamond composite sheet, which improves the cutting and crushing effect on rocks by means of the protrusions on the upper end face of the diamond layer. After cutting and crushing, the chip removal grooves opened on the upper end face of the diamond layer guide the chips formed during the crushing process, preventing the chips from accumulating on the surface of the protrusions, which would cause continuous friction between the protrusions and the chips, accelerate the wear of the protrusions, and affect the structural stability of the diamond layer. Attached Figure Description

[0016] Figure 1 This is an overall isometric schematic diagram of the present invention;

[0017] Figure 2 This is a front view schematic diagram of the entire utility model;

[0018] Figure 3 This is a schematic diagram of the combination of diamond layer and cemented carbide layer of this utility model;

[0019] Figure 4 This is a cross-sectional view of the hard alloy layer and permanent magnet of this utility model.

[0020] Legend:

[0021] 1. Diamond layer; 2. Hard alloy layer; 3. Permanent magnet; 4. Chip removal groove; 5. Protrusion; 6. Slot; 7. Bump; 8. Protective layer; 801. Anti-oxidation layer; 802. Wear-resistant layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1 to 4 One embodiment provided by this utility model:

[0024] A magnetically adsorbed diamond composite sheet includes a cemented carbide layer 2, a diamond layer 1 connected to the upper end face of the cemented carbide layer 2 by ultra-high pressure and high temperature sintering, a permanent magnet 3 fixedly disposed on the lower end face of the cemented carbide layer 2, three protrusions 5 fixedly disposed on the upper end face of the diamond layer 1, and three chip removal grooves 4 formed on the upper end face of the diamond layer 1. A protective layer 8 is disposed on the outer wall of both the cemented carbide layer 2 and the permanent magnet 3. The protective layer 8 includes an anti-oxidation layer 801 and an anti-wear layer 802.

[0025] Specifically, the permanent magnet 3 on the lower end face of the cemented carbide layer 2 can connect the diamond layer 1 and the cemented carbide layer 2 with the drill bit. The protrusions 5 on the surface of the diamond layer 1 can improve the cutting and crushing ability of the diamond layer 1. The chips cut off can be thrown out through the chip discharge groove 4 during the rotation of the drill bit, which can effectively prevent the chips from sticking to the surface of the diamond layer 1 and rubbing against it, thus affecting the service life of the diamond layer 1 during long-term use. The protective layer 8 on the outside of the cemented carbide layer 2 and the permanent magnet 3 can reduce the wear of the cemented carbide layer 2 and the permanent magnet 3 during use.

[0026] Reference Figure 3 The lower end face of the diamond layer 1 has multiple slots 6, and the upper end face of the cemented carbide layer 2 has multiple protrusions 7, which are respectively embedded in the multiple slots 6.

[0027] Specifically, the diamond layer 1 and the cemented carbide layer 2 are joined by high-temperature and high-pressure sintering. By embedding the protrusion 7 into the slot 6, the contact area between the diamond layer 1 and the cemented carbide layer 2 can be expanded, thereby improving the bonding strength of the diamond layer 1 and the cemented carbide layer 2 after sintering.

[0028] Reference Figures 1 to 3 The upper surfaces of the three protruding ridges 5 are all set as arc surfaces, and the three chip removal grooves 4 are interconnected.

[0029] Specifically, the protruding edge 5 on the arc surface can reduce the probability of the crushed debris remaining on the upper surface of the protruding edge 5, so that the debris can slide along the arc surface to the chip discharge groove 4 and then be discharged from the chip discharge groove 4.

[0030] Reference Figure 4 Two anti-oxidation layers 801 are fixedly disposed on the outer walls of the hard alloy layer 2 and the permanent magnet 3, respectively, and two wear-resistant layers 802 are fixedly disposed on the outer walls of the two anti-oxidation layers 801, respectively.

[0031] Specifically, the anti-oxidation layer 801 can reduce the oxidation caused by the high-temperature aluminum chromium nitride plating solution directly contacting the permanent magnet 3 with the wear-resistant layer 802, thus reducing its magnetic strength. The wear-resistant layer 802 can improve the wear resistance of the cemented carbide layer 2 and the permanent magnet 3. The anti-oxidation layer 801 can also prevent the cemented carbide layer 2 from rusting and prevent the high-temperature aluminum chromium nitride plating solution from directly contacting the permanent magnet 3, thus preventing the permanent magnet 3 from oxidizing and reducing its magnetism.

[0032] Reference Figure 4 The anti-oxidation layer 801 is a nickel alloy electroplating layer with a nickel content greater than 99%, and the wear-resistant layer 802 is an aluminum chromium nitride plating layer.

[0033] Specifically, the aluminum chromium nitride plating can improve the surface strength of the permanent magnet 3 and the hard alloy layer 2, and slow down their wear rate. At the same time, by first plating nickel on the surface of the permanent magnet 3, the high temperature generated during the aluminum chromium nitride plating process can prevent the permanent magnet 3 from oxidizing due to the high temperature, which would otherwise reduce the magnetism of the permanent magnet 3.

[0034] Working principle: During drill bit cutting, the protrusions 5 on the surface of the diamond layer 1 can improve the cutting effect. During the rotation of the drill bit, the chips generated by cutting can slide onto the inclined surface of the upper end of the protrusions 5 to the chip removal groove 4 and then be discharged through the chip removal groove 4 during the movement of the drill bit. This can prevent chips from remaining on the surface of the diamond layer 1, which would reduce the life of the diamond layer 1 due to repeated contact with chips during long-term use. In addition, the wear-resistant layer 802 can reduce the wear caused by rock chips contacting the cemented carbide layer 2. The anti-oxidation layer 801 can prevent the high-temperature aluminum chromium nitride plating solution from directly contacting the permanent magnet 3, which would reduce the magnetism of the permanent magnet 3. It can also reduce the corrosion of the cemented carbide layer 2 by moisture and prevent the cemented carbide layer 2 from rusting.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic adsorption type diamond compact comprising a cemented carbide layer (2), characterized in that: The upper end face of the cemented carbide layer (2) is connected to a diamond layer (1) by ultra-high pressure and high temperature sintering. A permanent magnet (3) is fixedly disposed on the lower end face of the cemented carbide layer (2). Three protruding ridges (5) are fixedly disposed on the upper end face of the diamond layer (1). Three chip removal grooves (4) are opened on the upper end face of the diamond layer (1). A protective layer (8) is disposed on the outer wall of both the cemented carbide layer (2) and the permanent magnet (3). The protective layer (8) includes an anti-oxidation layer (801) and an anti-wear layer (802).

2. The magnetic adsorption type diamond compact according to claim 1, characterized in that: The diamond layer (1) has multiple slots (6) on its lower end face, and the hard alloy layer (2) has multiple protrusions (7) fixedly arranged on its upper end face. The multiple protrusions (7) are respectively embedded in the multiple slots (6).

3. The magnetic adsorption type diamond compact according to claim 1, characterized in that: The upper surfaces of the three protruding ridges (5) are all set as arc surfaces, and the three chip removal grooves (4) are interconnected.

4. The magnetic adsorption type diamond compact according to claim 1, characterized in that: The two anti-oxidation layers (801) are respectively fixedly disposed on the outer wall of the hard alloy layer (2) and the permanent magnet (3), and the two wear-resistant layers (802) are respectively fixedly disposed on the outer wall of the two anti-oxidation layers (801).

5. The magnetic adsorption type diamond compact according to claim 1, characterized in that: The antioxidant layer (801) is a nickel alloy electroplating layer with a nickel content greater than 99%, and the wear-resistant layer (802) is an aluminum chromium nitride plating layer.

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