Titanium Alloy Grinding Characteristics And Heat Dissipation Optimization Solution

Titanium Alloy Characteristics
The types of titanium alloys are roughly divided into three categories, α titanium alloys, β titanium alloys, and α+β titanium alloys. The specification of the titanium alloy with the largest dosage at present is TC4 (Ti-6AI-4V), i.e. titanium alloy with α+β phase structure.
Titanium alloy has high strength, good thermal stability, high temperature strength, chemical activity, low thermal conductivity and other characteristics, the higher the temperature, the higher the hardness, belonging to one of the most difficult to process materials, grinding up very difficult, grinding performance is very poor. The grinding of titanium alloy usually adopts 36#-80# grain size.
Problems in grinding
1. The bonding problem of the grinding wheel is serious and the knot problem is serious.
In the grinding process, the surface of the titanium alloy falls off, adhering to the grinding wheel, and the bonded surface layer in the subsequent grinding will be accompanied by the abrasive particles on the grinding wheel together, the damage to the grinding wheel is very serious.
2. The workpiece is easy to burn, deformation and cracking
Due to the characteristics of titanium alloy, the higher the temperature, the higher the hardness, the required grinding force is larger, the resulting temperature is too high, and the heat transmitted into the workpiece is difficult to export, it is hot will destroy the titanium alloy, easy to lead to workpiece burns, deformation, and even cracks.

Grinding problem solution
Titanium alloy in the process of grinding the grinding wheel is prone to bonding as well as the workpiece is easy to burn, deformation and cracks are due to the high temperature of grinding. Higher grinding temperatures lead to intense plastic deformation, which causes damage to the surface of the workpiece, and the bonding effect occurs between the abrasive and the metal through physical or chemical adsorption.
The fundamental solution is to solve the heat dissipation problem. A common practice is to increase the grinding ratio in order to achieve as much removal as possible with as little wheel loss as possible.
Traditional practice: slow down the speed of the grinding wheel, the grinding temperature will also be reduced, than in the case of high-speed rotation, will achieve a better grinding effect; but in this case, due to the slowing down of the speed of the grinding wheel consumption will be accelerated, the more time and frequency of dressing, the slower the machining efficiency will be, invariably also affects the cost of processing, but also has a certain impact on the workpiece's flatness precision / dimensional accuracy; therefore this is not the best way. an optimal approach.
Ideal: good heat dissipation at constant speed. Grind at the highest speed allowed for the wheel or grinder, and utilize the wheel or the grinding fluid or the processing conditions to achieve better heat dissipation, and do not lose the rotational speed of the wheel as much as possible, so as not to consume the cost of the grinding wheel.
However, the requirements of the titanium alloy grinding fluid, in addition to cooling and flushing effect, the main thing is to inhibit the titanium and abrasive particles of adhesion and chemical effects. It is appropriate to use water-soluble grinding fluid containing a variety of extreme pressure additives.
Titanium alloy grinding fluid has excellent biostability and antirust properties. The longest service life can be more than two years; good anti-rust performance, reducing the consumption of cutting fluid. At the same time, titanium alloy grinding fluid does not contain chlorine, nitrite, phenol and other harmful substances, belongs to the environmental protection grinding fluid, will not irritate the skin, to protect the health of the operator. If you want to use the existing grinding wheel to improve efficiency, you can try to reduce the speed of the grinding wheel to see if it achieves the effect, if so, it proves that the grinding temperature caused by the problem, you can start from this condition to see how other conditions should be set.
In general, it is the use of grinding wheel heat dissipation, coupled with other methods of heat dissipation with each other, such as cutting fluid, etc. is not a good match; so that it provides better heat dissipation.