Preparation method of diamond tool

Abstract

The invention relates to a preparation method of a diamond tool. The preparation method is characterized by comprising the following steps that 1, a substrate of the diamond tool is provided; 2, diamond particles are provided; 3, alloy powder is provided; 4, a laser manufacturing system is provided; 5, the laser manufacturing system is started; 6, the surface of a base layer is clad with a thin layer of alloy powder through adopting of a high-power continuous laser coaxial powder feeding mode, and a diamond jetting device is started at the same time; 7, laser brazing is completed, and the diamond jetting device is closed; 8, a powder sprinkling device is started; 9, a short pulse laser is adopted for scanning a test piece; 10, the step 8 and the step 9 are repeated for several times to obtain a diamond tool solidified abrasive layer; 11, the laser manufacturing system is shut down; and 12, the prepared diamond tool is placed into a heating furnace to be subjected to post treatment, sothat the preparation process of the diamond tool is completed. Compared with the prior art, the diamond tool prepared through the method is good in bonding performance, small in heat influence and high in processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a preparation method of a diamond tool. Background technique [0002] Diamond has the highest hardness, rigidity and excellent wear resistance, corrosion resistance and chemical stability, making diamond widely used in various grinding tools. At present, many scholars study the brazing process to prepare single-layer superabrasive tools. Compared with multi-layer sintered superabrasive tools and single-layer electroplated superabrasive tools, brazed superabrasive tools can achieve metallurgical chemical bonding between abrasives, brazing materials and substrates, thereby improving the bonding strength. long life. In addition, the exposure height of the particles is increased, and the chip space is increased, which is not easy to be blocked. [0003] The manufacturing process of this new technology mainly relies on brazing in the furnace. The long b...

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Problems solved by technology

[0003] The manufacturing process of this new technology is mainly completed by brazing in the furnace. The brazing process takes a long time and may cause damage to the diamond particles and deformation of the tool matrix.

In addition, the size of the brazing furnace also limits the size of the diamond particle tool

Using high-frequency induction brazing avoids the limitations of the above process, but it is difficult to control the heating rate and heating range

[0004] Published on August 7, 2013, the invention patent with the announcement number CN 103231064 A "A new method for manufacturing a single-layer diamond grinding wheel brazed with nickel-based brazing material" discloses a method for manufacturing a brazed single-layer diamond grinding wheel. The invention reduces the brazing temperature by adding fine Al powder to the Ni-Cr-based solder, which solves the problems of thermal damage of diamond and deformation of the matrix, but this method does not solve the problem that large-sized grinding wheels cannot be directly brazed

[0005] Published on September 9, 2015, the invention patent of CN 104889518 A "Single-layer high-temperature brazed diamond grinding wheel process" discloses a single-layer high-temperature brazed diamond grinding wheel process. The invention first uses gas welding to spray 1mm~ The 1.5mm thick Ni-Cr alloy layer solves the problem of poor wettability between the alloy layer and the metal substrate, but this method still has problems such as difficult control of the temperature rise rate and heating range in induction brazing

However, during the laser brazing diamond experiment, it was found that the diamonds would move together with the molten pool, and finally the diamonds would gather into piles, resulting in serious thermal damage to the diamonds, and the diamonds could not be brazed to the preset position. to the ideal diamond arrangement sequence

In addition, in the general traditional laser brazing diamond process, the laser will be directly projected onto the diamond surface, which increases the possibility of burning, oxidation and graphitization of the diamond surface, resulting in a decrease in the bonding strength between the solder layer and the diamond

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