Fundamental aspects of ultrasonic assisted induction brazing of diamond onto 1045 steel

Huang

et al. 2019

Metals

Self Cite

A 3D finite element (FE) model is built to numerically analyze heating parameters on temperature during brazing diamond grains by the pulsed laser spot heating. A pulsed Nd:YAG laser is used for experimental validation. The results show that during laser heating, the temperature varies periodically because of the pulsed heat flux. Four key thermal indices, the maximum temperature Tmax, the minimum temperature Tmin, the average temperature Tav and the temperature fluctuation amplitude ΔT are addressed. The primary factor affecting Tmax, ΔT and Tav is the pulse power and on Tmin is the pulse frequency. The secondary effect factor on Tmax, Tav and ΔT is the pulse width and on Tmin is the pulse power. For engineering practice, the order of designing heating parameters is recommended as: pulse power, second frequency and last width.

Section: Influence Of Laser Heating Parameters On Temperaturementioning

confidence: 99%

Numerical Analysis of the Effects of Pulsed Laser Spot Heating Parameters on Brazing of Diamond Tools

Huang

et al. 2019

Metals

Self Cite

“…High frequency induction brazing (HFIB) technology is one of the commonly used methods in brazing of diamond or cBN wheels [9]. Many investigations illustrated that the grinding wheels fabricated with HFIB had excellent performance in the grinding of different-to-machine materials [10,11].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and deformation of the high-frequency induction brazed grinding wheel based on multi-field coupling

Int J Adv Manuf Technol

Hou

et al. 2023

With the characteristic of the high bonding strength to matrix, good sharpness and large chip-storage spaces, the brazed super abrasive grinding wheels have superiorities in the machining of di cult-tomachine materials. However, thermal deformation is caused by the high temperature during the brazing process, leading the accuracy of the brazed grinding wheel degraded greatly. By means of local heating, high frequency induction brazing can reduce the thermal deformation of the wheel. Aiming at the thermal deformation mechanism of the induction brazed wheel, a numerical simulation model of thermal-stressphase multi-eld coupling was established considering the temperature dependent physical properties of the material. The simulation result indicated that the phase transformation occurred near the work surface of the wheel substrate. The depth of phase transformation layer decreased from 6.0 mm to 2.9 mm with the scanning speed increasing from 0.5 mm/s to 2.0 mm/s. Microstructure of the phase transformation layer mainly consisted of ferrite, pearliten and bainite after brazing. An appropriate scanning speed was more important for the high accuracy of the wheel substrate during the induction brazing, since it had remarkable in uence on the stress and deformation than brazing temperature. The experimental results of the microstructure morphology and deformation proved that the numerical simulation model was correct with 10.4% error.

“…The proposed Cu-Sn alloy powders with the addition of Ti, TiN, TiB2, TiB and TiAl3 enabled the high-strength bonding between grains and wheel body, achieving the compressive strength of 879.3 MPa. To further improved the bond strength, Huang et al [35] introduced the ultrasonic-vibration-assisted brazing, and the results showed the residual stress at the bond bridges was reduced by 35.4%.…”

Section: Introductionmentioning

confidence: 99%

On the creation of structured abrasive tools via multiple-pass rotary wire EDM: A geometrical model

Int J Adv Manuf Technol

Liu

Zhao

et al. 2023

Structured Abrasive Tools (SATs) are considered as one of the nextgeneration abrasive tool solutions due to their superior ability to transport cutting fluids into grinding zones to lower grinding temperature and therefore enable high-quality machined surfaces. There are several SAT fabrication methods including mechanical, electroplating, brazing and laser-based methods.Mechanical methods can not produce SATs with small-sized structures due to significant contact forces, while electroplating has poor controllability of abrasive grain allocations. Brazing requires special machines with high-precision motion control while laser-based methods need significant efforts on laser parameter selection and optimisation. With this, here we present a Multiple-Pass Rotary Wire Electrical Discharge Machining (MPRWEDM) method to address the aforementioned limitations. We also develop a theorical model of the created kerf profile during the MPRWEDM so as to enable controllable fabrication of SATs.The model was experimentally validated, showing a decent relative error of Page 2 of 39 9.8%. The non-linear multiple-pass effect was studied both analytically and experimentally. Based on MPRWEDM, not only the SAT with designed grooves but also the structured surface (having an array of pyramid geometries) generated by the SAT were successfully created, proving the great potential of MPRWEDM in controllable production of even more advanced tools.