Cutting fluid pressure has such a great influence on the machining accuracy

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Cutting fluid pressure has such a great influence on the machining accuracy

In addition to the role of cooling or lubrication in the machining process, the cutting fluid is helpful for chip removal in the processing of deep-hole drilling. There are many ways to discharge water from the tool, including from the handle end, the collet end of the tool end itself, however, the pressure of the water from the tool will greatly affect the smoothness of chip removal and the chucking force of the deep hole, and even affect the machining accuracy.

Introduction

What is cutting fluid?

Cutting fluid, also known as cutting oil, coolant, or lubricant, is a special fluid that helps to cool and lubricate workpieces and tools in machining. It may be oil, paste, gel, vegetable oil, water, or other materials, most of which are in cutting fluid is always used when cutting, but sometimes it depends on the material of the workpiece. For example, if the chips are mostly short chips, they will easily mix with the cutting fluid and block the chip hole, which will reduce the efficiency. A good cutting fluid has a large enthalpy, improves the lubricity of workpieces and tools, has no biological hazard, and prevents rusting of machinery and tools.

【Learn More】Do you choose the Right Cutting Fluid?

The role of cutting fluid

Cutting fluid plays an important role in cutting processing. The cutting tool and the workpiece will rub and generate heat, and the surrounding air has poor thermal conductivity during processing, which may cause heat to condense on the workpiece and cause deformation. The cutting fluid can cool the workpiece and avoid such situation happen. In addition to cooling, the cutting fluid can accelerate cutting and reduce friction and tool wear. It also helps prevent overheating during cutting.

The pressure of cutting fluid

The blue line in the picture is the axial force detected by the Smart cutting. The signal from 01:00 to 01:25 is the time to turn on the coolant through center. It shows that the force is practically very powerful to affect the clamping accuracy of the tool and the moment of cutting, therefore, it is difficult to detect the problem of the poor-quality after machining through the inner hole.

It takes lots of time cost to adjust the pressure of the coolant through center to find out the reason. How to quickly adjust the appropriate pressure value for various deep holes?

The red circle in the picture is the drilling force combined with the positive pressure of the hole and the negative pressure of the coolant through center.

We can conclude that the force of drilling is gradually increase with the depth, but signal doesn’t rise significantly, which indicating the condition of chip removal is healthy.

As our test result shown on the right photo, the axial force corresponding to the pressure value at each stage. This axial force will have an appropriate proportion with the deepest cutting force of the drilling. Therefore, it is obvious to set a value that can not only remove chips smoothly and maintain a good accuracy, but also the best pressure value that will not drop the knife off.

Main image photo by gallery

Reference site Wikipedia

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