How to avoid problems with U-drills in CNC machining

Firstly, the difference between a U-drill and a regular drill is that it uses a peripheral blade and a central blade. From this perspective, the relationship between a U-drill and a regular hard drill is actually similar to that between a machine clamped turning tool and a welding turning tool. After the tool wears out, the blade can be replaced without the need for re grinding.
After all, using an adjustable blade is still more material efficient than using a solid drill, and the consistency of the blade makes it easier to control part dimensions.
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U-drill can drill holes on surfaces with an inclination angle of less than 30 ° without reducing cutting parameters.
After reducing the cutting parameters of the U-drill by 30%, intermittent cutting can be achieved, such as machining intersecting holes, intersecting holes, and intersecting perforations.
▲ U-drill can achieve drilling of multiple step holes, and can also boring, chamfering, and eccentric drilling.
When drilling with U-drill, the chips are mostly short and can be safely removed using its internal cooling system. There is no need to clean the chips on the tool, which is beneficial for the continuity of product processing, shortening processing time, and improving efficiency.
Under standard aspect ratio conditions, there is no need to remove chips when drilling with a U-drill.
▲ U-drills are interchangeable cutting tools, which do not require grinding after blade wear, making replacement more convenient and cost-effective.
The surface roughness value and tolerance range of the holes machined with U-drills are small, which can replace the work of some boring cutters.
▲ Using a U-drill does not require pre drilling a center hole, and the bottom surface of the processed blind hole is relatively straight, eliminating the need for a flat bottomed drill bit.
The use of U-drill technology can not only reduce the number of drilling tools, but also because U-drill uses a head embedded with a hard alloy blade, its cutting life is more than ten times that of a regular drill. At the same time, there are four cutting edges on the blade, which can be replaced at any time when the blade is worn. The new cutting saves a lot of grinding and tool replacement time, and can improve work efficiency by an average of 6-7 times.
Common issues with U-drills
Blades are damaged too quickly and are prone to breakage, resulting in increased processing costs.
During processing, there is a piercing whistling sound and the cutting state is abnormal.
Machine tool vibration affects the machining accuracy of the machine tool.
Precautions for using U-drills
The installation of U-drill should pay attention to the front and back directions, which blade is facing upwards, which blade is facing downwards, which is facing inward, and which is facing outward.
The center height of the U-drill must be corrected, and the control range is required according to its diameter size, generally controlled within 0.1mm. The smaller the diameter of the U-drill, the higher the center height requirement. If the center height is not good, the two sides of the U-drill will wear out, the aperture will be larger, the blade service life will be shortened, and small U-drills are easy to break.
The U-drill has high requirements for coolant, and it is necessary to ensure that the coolant is injected from the center of the U-drill. The higher the pressure of the coolant, the better. The excess outlet of the turret can be blocked to ensure its pressure.
The cutting parameters of the U-drill strictly follow the manufacturer's instructions, but also consider different brands of blades and the power of the machine tool. During processing, appropriate adjustments can be made based on the load value of the machine tool, generally using high speed and low feed.
▲ The U-drill blade should be regularly inspected and replaced in a timely manner. Different blades cannot be installed upside down.
Adjust the feed amount based on the hardness of the workpiece and the length of the tool overhang. The harder the workpiece, the greater the tool overhang, and the smaller the feed amount should be.
Do not use excessively worn blades. The relationship between blade wear and the number of machinable workpieces should be recorded in production, and new blades should be replaced in a timely manner.
▲ Use sufficient and pressure correct internal coolant. The main functions of coolant are chip removal and cooling.
U-drills cannot be used to process softer materials such as copper, soft aluminum, etc.
Tips for using U-drills in CNC machine tools
When using a U-drill, high requirements are placed on the rigidity of the machine tool and the alignment between the tool and the workpiece. Therefore, U-drills are suitable for use on high-power, high rigidity, and high-speed CNC machine tools.
When using a U-drill, the center blade should be a resilient blade, and the surrounding blades should be sharp blades.
When processing different materials, different groove shaped blades should be selected. Generally, when the feed is small, the tolerance is small, and the U-drill aspect ratio is large, groove shaped blades with smaller cutting force should be selected. Conversely, when rough machining, the tolerance is large, and the U-drill aspect ratio is small, groove shaped blades with larger cutting force should be selected.
When using a U-drill, it is necessary to consider the power of the machine spindle, the stability of the U-drill clamping, the pressure and flow rate of the cutting fluid, and control the chip removal effect of the U-drill. Otherwise, it will greatly affect the surface roughness and dimensional accuracy of the hole.
When clamping the U-drill, make sure that the center of the U-drill coincides with the center of the workpiece and is perpendicular to the surface of the workpiece.
When using a U-drill, appropriate cutting parameters should be selected based on different part materials.
During the trial cutting of the U-drill, be careful not to reduce the feed rate or speed arbitrarily due to fear, which may cause damage to the U-drill blade or U-drill.
When using a U-drill for machining, if the blade is worn or damaged, the cause should be carefully analyzed and replaced with a more resilient or wear-resistant blade.
When using a U-drill to process a stepped hole, it is important to start with the large hole and then process the small hole.
When using a 10. U drill, it is important to ensure that the cutting fluid has sufficient pressure to flush out the chips.
11. The blades used for the center and edge of the U-drill are different, and must not be used incorrectly, otherwise it will damage the U-drill blade.
When using a U-drill for drilling, workpiece rotation, tool rotation, and simultaneous rotation of the tool and workpiece can be used. However, when the tool moves in a linear feed mode, the most common method is to use workpiece rotation.
When machining on a CNC lathe, the performance of the lathe should be considered, and cutting parameters should be adjusted appropriately, usually by reducing the speed and low feed rate.