Scratching cutter for machining cathode carbon block for aluminum electrolysis

Abstract

The utility model relates to the field of aluminum electrolysis, in particular to a scratching cutter for machining a cathode carbon block for aluminum electrolysis, which comprises an installation cutter plate, a plurality of welding bosses which are transversely arranged at intervals are arranged on the front end face of the installation cutter plate, a cutting edge portion is arranged on the top face of each welding boss, and the front end of each cutting edge portion is in a tip shape. The cutting edge part comprises a polycrystalline diamond layer, the polycrystalline diamond layer is compounded on a hard alloy substrate, and the hard alloy substrate is connected to the top surface of the welding boss through a welding layer. According to the utility model, the machining yield of the cathode carbon block can be effectively improved, and the occurrence of edge breakage and microcracks is reduced; and meanwhile, the cutter is high in hardness, not prone to abrasion, high in machining stability and long in service life.

Description

A scratching tool for machining cathode carbon blocks used in aluminum electrolysis Technical Field

[0001] This utility model relates to the field of aluminum electrolysis, and in particular to a scratching tool for machining cathode carbon blocks used in aluminum electrolysis. Background Technology

[0002] Cathode carbon blocks are a key component in electrolytic aluminum production, and their surface quality directly affects the conductivity and energy efficiency of the electrolytic cell. Traditional machining methods for cathode carbon blocks mainly involve milling or grinding with carbide or ordinary diamond tools. However, due to the high hardness, brittleness, and graphite content of the cathode carbon block material, problems such as edge chipping, micro-cracks, and abnormal tool wear easily occur during machining. Furthermore, specific grooves need to be machined on the surface of the carbon block to optimize electrolyte flow and aluminum deposition, which places higher demands on the wear resistance and cutting stability of the cutting tools. Summary of the Invention

[0003] Based on the above problems, the purpose of this utility model is to provide a scratching tool for machining cathode carbon blocks for aluminum electrolysis, which aims to solve the problems of easy chipping, micro-cracks and abnormal tool wear that exist when traditional cemented carbide tools and ordinary diamond tools are used to machine cathode carbon blocks.

[0004] The present invention adopts the following technical solution:

[0005] This utility model provides a scratching tool for machining cathode carbon blocks used in aluminum electrolysis, including a mounting plate. The front end face of the mounting plate is provided with a plurality of horizontally spaced welding bosses. The top surface of each welding boss is provided with a cutting edge, the front end of which is pointed. The cutting edge includes a polycrystalline diamond layer, which is laminated on a cemented carbide substrate. The cemented carbide substrate is connected to the top surface of the welding boss through a welding layer.

[0006] Preferably, the welding layer is a silver-based brazing filler metal.

[0007] Preferably, the chip-guiding surface at the front end of the welding boss is a trapezoidal surface that is wider at the bottom and narrower at the top.

[0008] Preferably, the angle between the chip guide surface and the cutting edge is 75°.

[0009] Preferably, the front end face of the mounting blade is provided with a protrusion, and the two ends of the protrusion form a step with the front end face of the mounting blade, and each of the welding bosses is provided on the protrusion.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0011] This invention can effectively improve the yield rate of cathode carbon block processing and reduce the occurrence of edge chipping and micro-cracks; at the same time, the tool itself has high hardness, is not easy to wear, and has high processing stability and service life. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 is a schematic diagram of the scratching tool for machining cathode carbon blocks used in aluminum electrolysis according to this utility model.

[0014] Figure 2 is a side view of the scratching tool processed by the cathode carbon block for aluminum electrolysis according to this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Mounting blade; 101. Welding boss; 101-1. Chip guide surface; 102. Protrusion; 2. Cutting edge; 201. Polycrystalline diamond layer; 202. Hard alloy substrate; 3. Welding layer. Detailed Implementation

[0016] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] As shown in Figures 1 and 2, this embodiment discloses a scratching tool for machining cathode carbon blocks used in aluminum electrolysis, comprising a mounting plate 1 and a cutting edge 2. The mounting plate 1 serves as the load-bearing base of the tool, wherein the front end face of the mounting plate 1 is integrally formed with multiple horizontally spaced welding bosses 101, and a cutting edge 2 is provided on the top surface of each welding boss 101. The front end of the cutting edge 2 is pointed, and the cutting edge 2 is formed by bonding a polycrystalline diamond layer 201 to a cemented carbide substrate 202 through a high-temperature and high-pressure sintering process; the cemented carbide substrate 202 is metallurgically bonded to the welding bosses 101 on the front end face of the mounting plate 1 through a welding layer 3, forming a stable connection structure.

[0018] It should be noted that the cutting edge 2 is a diamond composite sheet. In this embodiment, sintering needs to be carried out under ultra-high pressure and high temperature environment, with a typical pressure range of 5-6 GPa and a temperature range of 1400-2000℃. This condition promotes the recrystallization reaction between the diamond micro powder and the cemented carbide substrate, forming a strong bond.

[0019] During the machining of cathode carbon blocks, the polycrystalline diamond layer 201 directly acts on the workpiece surface for cutting operations. This design significantly improves the machining efficiency of cathode carbon blocks, and at the same time, due to the extremely high hardness of the material itself, it effectively reduces the degree of tool wear.

[0020] In this embodiment, the welding layer 3 can be made of silver-based brazing filler metal (e.g., 49 silver brazing filler metal from Zhejiang Huayang Welding Co., Ltd.). The silver-based brazing filler metal is fused between the cemented carbide substrate 202 and the welding boss 101 using a high-frequency induction brazing process (specifically, brazing temperature 680℃, heating rate 15℃ / s, and holding time 10s), forming a reliable connection between dissimilar materials. The brazing connection between the cemented carbide substrate 202 and the welding boss 101 not only improves the manufacturing efficiency of the tool but also significantly enhances the service life of the connection part.

[0021] In this embodiment, the chip guide surface 101-1 at the front end of the welding boss 101 is a trapezoidal surface that is wider at the bottom and narrower at the top. This design is conducive to strengthening the cutting force and facilitating the flow of chips (carbon block debris). Furthermore, the included angle between the trapezoidal chip guide surface 101-1 and the cutting edge 2 is 75°, which not only enhances the cutting force but also effectively removes machining debris and prevents secondary wear.

[0022] In this embodiment, the welding boss 101 also adopts a trapezoidal structure design from back to front. This design is conducive to reducing the weight of the overall mounting blade 1, improving the strength of the welding boss 101, eliminating stress concentration points, and reducing material usage.

[0023] In this embodiment, the front end face of the mounting plate 1 is provided with a protrusion 102. The two ends of the protrusion 102 form steps with the front end face of the mounting plate 1. Each welding boss 101 is provided on the protrusion 102. During high-frequency induction brazing, an alternating magnetic field is generated in the induction coil by a high-frequency current, thereby forming eddy currents and generating heat on the surface and inside of the metal workpiece, thus achieving the welding purpose. The design of the protrusion 102 can distinguish between the brazed surface and the non-brazed surface of the tool, making it easier to position the tool on the brazed surface during brazing, while the non-brazed surface will not be affected by heat. In addition, the protrusion 102 serves as a transition part to connect the welding boss 101 and the mounting plate 1. When the mounting plate 1 is installed on the machine tool / milling machine tool holder, the protrusion 102 acts as a transition area, avoiding mechanical damage to the cutting edge 2 and significantly improving the machining stability and service life of the tool.

[0024] Precise positioning for brazing is achieved through the pre-set positioning groove 102, which also bears the main impact load during processing. At the same time, the mounting plate 1 is provided with a positioning groove 102, which not only ensures the installation and positioning accuracy, but also avoids mechanical damage to the cutting edge 2 by isolating the mounting plate 1 from the cutting edge 2, thus significantly improving the processing stability and service life of the tool.

[0025] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A scratching tool for machining cathode carbon blocks used in aluminum electrolysis, characterized in that: The device includes a mounting blade (1), the front end face of which is provided with a plurality of horizontally spaced welding bosses (101), the top surface of each welding boss (101) is provided with a cutting edge (2), the front end of the cutting edge (2) is pointed; the cutting edge (2) includes a polycrystalline diamond layer (201), the polycrystalline diamond layer (201) is laminated on a cemented carbide substrate (202), and the cemented carbide substrate (202) is connected to the top surface of the welding boss (101) through a welding layer (3).

2. The scratching tool for machining cathode carbon blocks used in aluminum electrolysis according to claim 1, characterized in that: The welding layer (3) is a silver-based brazing filler metal.

3. The scratching tool for machining cathode carbon blocks used in aluminum electrolysis according to claim 1, characterized in that: The chip guide surface (101-1) at the front end of the welding boss (101) is a trapezoidal surface that is wider at the bottom and narrower at the top.

4. The scratching tool for machining cathode carbon blocks used in aluminum electrolysis according to claim 1, characterized in that: The included angle between the chip guide surface (101-1) and the cutting edge (2) is 75°.

5. The scratching tool for machining cathode carbon blocks used in aluminum electrolysis according to claim 1, characterized in that: The front end face of the mounting blade (1) is provided with a protrusion (102), and the two ends of the protrusion (102) form a step with the front end face of the mounting blade (1). Each welding boss (101) is provided on the protrusion (102).

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