Method for evaluating cracking of brazing diamond abrasive grain alloy layer

A technology of brazing alloy and evaluation method is applied in the field of evaluation of cracking of brazed diamond abrasive grain alloy layer, which can solve the problems of micro-crack diamond, reducing the service life of brazed diamond tools, and transgranular cracking.

Inactive Publication Date: 2010-10-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0003] The actual production and application found that although the bonding strength between the brazed diamond and the matrix is ​​good, there are small cracks on the surface of a few brazed diamond abrasive grains or cause diamond transgranular fracture
Experiments have shown that diamond will not produce cracks or cracks after undergoing multiple vacuum high temperature processes; due to the large difference in thermal physical parameters between the brazing alloy of diamond and diamond, such as the large difference in thermal expansion coefficient, the deformation during the brazing cooling process Inconsistent shrinkage produces large thermal residual stress, which cracks the brazing alloy layer on the outer layer of the brazed diamond, resulting in diamond cracking and reducing the quality of the brazed diamond, thereby reducing the service life of the brazed diamond tool

Method used

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  • Method for evaluating cracking of brazing diamond abrasive grain alloy layer
  • Method for evaluating cracking of brazing diamond abrasive grain alloy layer
  • Method for evaluating cracking of brazing diamond abrasive grain alloy layer

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Embodiment Construction

[0026] Introduce the content of the present invention in detail below by example.

[0027] 1. Use Ni-Cr alloy as the solder to make brazed diamond abrasive grains, ignoring the transition layer.

[0028] 2. Among them, the tensile strength of the brazing alloy layer Ni-Cr alloy σ (Ni-Cr)max =280-330Mpa.

[0029] 3. Establish the thermoelastic model of brazing diamond, based on the fact that the radius of diamond particles is very small (generally less than 0.4mm), although the shape of the particles is relatively complex, it is approximately considered as a sphere, and the temperature field of the brazing diamond particles is uniform during the heating process of the brazing furnace , and according to a certain cooling rate cooling, cooling temperature difference is ΔT, diamond and nickel-chromium alloys are in line with the continuous, uniform and isotropic elastic mechanics of materials. A simplified schematic diagram of brazed diamond abrasive grains is attached figure 1...

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Abstract

The invention relates to a method for evaluating cracking of a brazing diamond abrasive grain alloy layer. The method comprises the following three basic steps of: 1) determining an evaluation index of brazing diamond heat damage; 2) establishing a brazing diamond abrasive grain thermo-elastic mathematical model; and 3) processing data by adopting specific software, and analyzing a brazing diamond cracking range. The method can effectively and theoretically evaluate the quality of brazing diamond, and predict the brazing diamond cracking possibility of different diamond granularities, brazingalloys and brazing temperatures to obtain good consistency with a practical evaluation result. The method can improve the brazing diamond quality and improve a brazing diamond process.

Description

technical field [0001] The invention relates to an evaluation method for cracking of an alloy layer of brazed diamond abrasive grains, which can be used for evaluating the production quality of brazed diamond abrasive grains in impregnated brazed diamond drill bits, and for the brazing layer during the cooling process of the brazed diamond abrasive grains. Evaluation and prediction of cracking range. technical background [0002] Impregnated and brazed diamond tools have attracted much attention due to the high bonding strength between diamond and matrix, but there are still quality problems in the manufacture of brazed diamond particles. [0003] The actual production and application found that although the bonding strength between brazed diamond and the matrix is ​​good, there are small cracks on the surface of a small number of brazed diamond abrasive grains or cause diamond transgranular fracture. Experiments have shown that diamond will not produce cracks or cracks aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 卜长根余庆玲叶赟曾辉
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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