CN102922138A - Method for repairing broach cutter by using brass powders - Google Patents

Abstract

A method of using brass powder to repair broach tools, which is designed to solve the technical problem that the direct contact welding of high-speed steel and hard alloy is difficult to achieve reliable connection when welding high-speed steel and hard alloy by laser direct welding technology . This method uses brass powder as solder to realize welding of high-speed steel and hard alloy in a vacuum environment. On the one hand, it prevents the presence of oxygen in the welded joint and produces pores that affect the welding quality. On the other hand, the thermal expansion coefficient and thermal conductivity of brass are higher than those of high-speed steel. Steel and cemented carbide play a role in relieving joint stress and reducing joint deformation between high-speed steel and cemented carbide. The preparation method of the invention can realize the high-strength connection between the high-speed steel and the hard alloy, repair and remanufacture the damaged broach tool, and is also suitable for the repair and remanufacture of the development tool.

Description

A method of using brass powder to repair broaches

technical field

The invention relates to a method for repairing a broach tool, in particular to a method for using brass powder to repair a broach tool.

Background technique

With the rapid development of my country's manufacturing industry, the cutting tool market has great potential for development. In 2010, my country's cutting tool consumption reached 33 billion yuan, ranking first in the world. It is predicted that the growth rate of tool consumption in the future will still be much higher than that of developed countries. Just because there is such a large consumption of cutting tools in our country every year, the amount of cutting tools reimbursed due to wear and tear is also huge. It can be seen that seeking a method for repairing worn complex tools so that they can meet the use requirements after repairing, then the enterprise will save a lot of valuable materials and funds, reduce production costs, improve enterprise efficiency, and enhance enterprise competitiveness.

Laser welding is the use of high-energy laser pulses to locally heat materials in a small area. The energy of laser radiation diffuses into the interior of the material through heat conduction, and the material is melted to form a specific molten pool to achieve the purpose of welding. It is an effective method for connecting a metal material. Compared with other welding methods, it has the advantages of small heat-affected zone, small deformation of workpieces and tools, and a wide range of weldable materials. However, due to the large difference in physical properties such as melting point, thermal conductivity, and thermal expansion coefficient between high-speed steel and cemented carbide, and the lattice atomic radius of the two is also very different, it is difficult to achieve reliable direct contact welding between high-speed steel and cemented carbide. connect.

Contents of the invention

In order to solve the problem that the direct contact welding between high-speed steel and hard alloy is difficult to achieve reliable connection when welding high-speed steel and hard alloy by laser direct welding technology, the invention provides a method of using brass powder to weld high-speed steel and hard alloy. The alloy method, which can realize the high-strength connection of high-speed steel and cemented carbide, and the technical scheme adopted includes the following steps:

1) Record the original data of the broach tool, namely: angle, cutting edge length, tooth lift related data;

2) Cut off the damaged edge of the broach tool, and cut out the carbide block corresponding to the cut part;

3) Clean the cut surface of the broach tool and the hard alloy block to remove the oxide layer;

4) Fix the cleaned broach tool, put it into the vacuum box, and vacuumize it. When the vacuum degree is greater than 6×10 ^-2 Pa, fill it with argon as a protective gas;

5) Preparation of solder, the powder used in soldering is made of H62 brass powder: flux = 2:1 weight ratio, wherein: flux is mixed with dehydrated borax: boric acid = 7:3 weight ratio;

6) Use coaxial powder feeder to feed powder and laser welding;

7) Take the tool out of the vacuum box, and transfer it to a box furnace at 260 ° C to 300 ° C for more than three hours for tempering;

8) Carry out sand blowing treatment on the cutting tool, and clean the impurities such as oxide skin and welding slag on the surface;

9) Sharpen the tool according to the original data of the tool.

Features and beneficial effects of the present invention: Brass powder is used as solder to realize welding of high-speed steel and hard alloy in a vacuum environment. On the one hand, it prevents the presence of oxygen in the welded joint and produces pores that affect the welding quality. On the other hand, the thermal expansion coefficient of brass and The thermal conductivity is higher than that of high-speed steel and hard alloy, which can relieve the joint stress and reduce joint deformation between high-speed steel and hard alloy, and effectively improve the welding strength. The preparation method of the invention can realize repairing and remanufacturing of damaged broach tools.

Detailed ways:

A method of using brass powder to restore a broach tool, comprising the following steps:

1) Record the original data of the broach tool, namely: angle, cutting edge length, tooth lift related data;

2) Cut off the damaged edge of the broach tool, and cut out the carbide block corresponding to the cut part;

3) Clean the cut surface of the broach tool and the hard alloy block to remove the oxide layer;

4) Fix the cleaned broach tool, put it into the vacuum box, and vacuumize it. When the vacuum degree is greater than 6×10 ^-2 Pa, fill it with argon as a protective gas;

5) Preparation of solder, the powder used in soldering is made of H62 brass powder: flux = 2:1 weight ratio, wherein: flux is mixed with dehydrated borax: boric acid = 7:3 weight ratio;

6) Use coaxial powder feeder to feed powder and laser welding;

7) Take the tool out of the vacuum box, and transfer it to a box furnace at 260 ° C to 300 ° C for more than three hours for tempering;

8) Carry out sand blowing treatment on the cutting tool, and clean the impurities such as oxide skin and welding slag on the surface;

9) Sharpen the tool according to the original data of the tool.

Wherein: the thickness of the brass powder is 0.2-0.3 mm;

The average particle size of the brass powder is 200 mesh;

The broach tool material is high-speed steel M42 or W2Mo9Cr4VCo8;

The cemented carbide block material is YG6 or YG8 or YG12.

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with examples, but the content of the present invention is not limited only to the following examples.

Embodiment: The material of the flat broach tool is the welding of high-speed steel (M42) and hard alloy (YG8). The method of using brass powder to repair the broach tool is realized through the following steps:

1) Record the original data of the plane broach (angle, cutting edge length, tooth lift, etc.);

2) Cut off the damaged edge of the flat broach, and cut out a hard alloy block corresponding to the size of the cut part;

3) Clean the plane broach to cut off the wound surface and the hard alloy block, and remove the oxide layer;

4) Fix the cleaned flat broach, put it in a vacuum box, and vacuum it. When the vacuum degree is greater than 6×10 ^-2 Pa, fill it with argon as a protective gas;

5) Use a coaxial powder feeder to feed powder (the powder is H62 brass powder, the average particle size is 200 mesh, the flux is dehydrated borax: boric acid=7:3, the ratio of brass powder to flux is 2:1), yellow When the thickness of copper powder is 0.2-0.3mm, laser welding is carried out;

6) Take the tool out of the vacuum box and transfer it to a box furnace at 260°C to 300°C for more than three hours for tempering;

7) Carry out sand blowing treatment on the tool to clean the oxide skin, welding slag and other impurities on the surface;

8) Sharpen the tool according to the original data recorded by the tool.

The above method is also applicable to the laser welding of broach tool material high-speed steel M42 (or W2Mo9Cr4VCo8) and cemented carbide block material YG6 or YG12.

Claims (5)

1. method of utilizing brass powder to repair the broaching tool cutter, the method may further comprise the steps:

1) initial data of record broaching tool cutter, that is: angle, cutting edge length, rise per tooth related data;

2) with broaching tool tool failure sword Partial Resection, and cut out and the corresponding hard alloy blocks of cut-out;

3) the cleaning broaching tool cutter excision face surface of a wound and hard alloy blocks are removed oxide layer;

4) the broaching tool cutter after will cleaning fixes, and puts into vacuum tank, vacuumize, when vacuum greater than 6 * 10 ^-2Be filled with argon gas during Pa and make protection gas;

5) preparation scolder, the powder that uses during welding is made by the weight proportion of H62 brass powder: scaling powder=2:1, and wherein: scaling powder is mixed by the weight proportion of dewatering borax: boric acid=7:3;

6) utilize coaxial powder feeding device powder feeding, laser weld;

7) cutter is taken out in vacuum tank, change in 260 ℃～300 ℃ the batch-type furnace insulation over to and do temper more than three hours;

8) cutter is carried out blast and process, level the impurity such as oxide skin welding slag on surface;

9) according to cutter initial data sharpening cutter.

2. it is characterized in that according to right 1 described a kind of method of utilizing brass powder to repair the broaching tool cutter: described brass powder thickness is 0.2～0.3mm.

3. it is characterized in that according to right 1 described a kind of method of utilizing brass powder to repair the broaching tool cutter: described brass powder particle mean size is 200 orders.

4. it is characterized in that according to right 1 described a kind of method of utilizing brass powder to repair the broaching tool cutter: described broaching tool cutter material is high-speed steel M42 or W2Mo9Cr4VCo8.

5. it is characterized in that according to right 1 described a kind of method of utilizing brass powder to repair the broaching tool cutter: described carbide alloy block of material is YG6 or YG8 or YG12.