Some notes of using U shape drill - PAY for CNC components
Some notes of using U shape drill
 First of all, the difference between the U drill and the ordinary drill is that the U drill uses the peripheral blade and the center blade of the blade. From this perspective, the relationship between the U drill and the ordinary hard drill is actually similar to the relationship between the machine clamp turning tool and the welding turning tool. The blade can be replaced directly without regrinding after wear.
After all, the use of indexable inserts saves materials than solid drills, and the consistency of the inserts makes it easier to control the size of the parts.

SO, U drill is your good choice

▲U drill can drill holes on the surface with inclination angle less than 30~ without reducing the cutting parameters.

▲After the cutting parameters of U drill are reduced by 30%, intermittent cutting can be realized, such as processing intersecting holes, intersecting holes, and intersecting holes.

▲U drill can realize the drilling of multi-step holes, as well as boring, chamfering and eccentric drilling.

▲U drilling and drilling, the drilling chips are mostly short chips, and its internal cooling system can be used for safe chip removal without cleaning the chips on the tool, which is conducive to the continuity of product processing, shortens processing time and improves efficiency.

▲Under the condition of standard aspect ratio, there is no need to remove chips when using U drill to make holes.

▲U drill is an indexable tool, and the blade does not need to be sharpened after it is worn out. It is convenient to replace and low in cost.

▲The surface roughness value of the hole processed by the U drill is small, and the tolerance range is small, which can replace part of the work of the boring tool.

▲U drill does not need to pre-drill the center hole, and the bottom surface of the blind hole is relatively straight, eliminating the need for a flat-bottomed drill.

▲Using the U drill technology can not only reduce the drilling tools, but also because the U drill uses the head inlaid cemented carbide inserts, its cutting life is ten times that of ordinary drills. At the same time, there are four cutting edges on the inserts. The cutting can be replaced at any time when worn. The new cutting saves a lot of time for grinding and changing tools, and can improve work efficiency by 6-7 times on average.

U-Diamond FAQ

❶ The blade is damaged too quickly, it is easy to break, and the processing cost increases.

❷ There is a harsh whistling sound during processing, and the cutting state is abnormal.

❸ The machine jitter affects the machining accuracy of the machine tool.

Points to note when using U drill

▲ When installing the U drill, pay attention to the front and back directions, which blade is upward, which blade is downward, which faces inward, and which faces outward.

▲ The center height of the U drill must be corrected. The control range is required according to its diameter. Generally, it is controlled within 0.1mm. The smaller the diameter of the U drill, the higher the center height is required. If the center height is not good, the two sides of the U drill will Wear, the hole diameter will be too large, the life of the blade will be shortened, and the small U drill will easily break.

▲ U-drills have high requirements for coolant. It must be ensured that the coolant is ejected from the center of the U-drill. The pressure of the coolant should be as large as possible. The excess water outlet of the turret can be blocked to ensure its pressure.

▲ The cutting parameters of the U drill are strictly in accordance with the manufacturer's instructions, but different brands of inserts and the power of the machine tool must also be considered. During processing, you can refer to the load value of the machine tool and make appropriate adjustments. Generally, high speed and low feed are used.

▲ U drill blades should be checked frequently and replaced in time. Different blades cannot be reversed.

▲ Adjust the feed amount according to the hardness of the workpiece and the length of the tool overhang. The harder the workpiece, the larger the tool overhang, and the smaller the tool feed.

▲ Do not use excessively worn blades. The relationship between blade wear and the number of workpieces that can be processed should be recorded during production, and new blades should be replaced in time.

▲ Use sufficient and correct pressure internal coolant. The main function of the coolant is chip removal and cooling.

▲ U drills cannot be used to process softer materials, such as copper, soft aluminum, etc.

U drill in the use of CNC machine tools

1. U-drills have high requirements on the rigidity of the machine tool and the neutrality of the tool and the workpiece. Therefore, the U-drill is suitable for use on high-power, high-rigidity, and high-speed CNC machine tools.

2. When using a U drill, the center blade should be a tough blade, and the peripheral blade should be a sharper blade.

3. When processing different materials, inserts with different geometries should be selected. Under normal circumstances, when the feed is small, the tolerance is small, and the U drill has a large length-to-diameter ratio, the cutter with a smaller cutting force should be selected. On the contrary, rough machining, large tolerance, U If the length to diameter ratio of the drill is small, choose a groove-shaped insert with a larger cutting force.

4. When using a U drill, you must consider the spindle power of the machine tool, the stability of the U drill clamping, the pressure and flow of the cutting fluid, and control the chip removal effect of the U drill, otherwise the surface roughness and size of the hole will be greatly affected. Accuracy.

5. 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.

6. When using U drills, choose suitable cutting parameters according to different parts materials.

7. During the test cutting of the U drill, be sure not to reduce the feed rate or reduce the speed at will due to caution and fear, which may damage the U drill blade or damage the U drill.

8. When using U-drill processing, when the blade is worn or damaged, carefully analyze the cause and replace the blade with better toughness or more wear-resistant.

9. When using U drills to process stepped holes, you must first process the large holes and then process the small holes.

10. When using the U drill, pay attention that the cutting fluid must have enough pressure to flush out the chips.

11. The blades used in the center and the edge of the U drill are different, and must not be misused, otherwise the U drill shaft will be damaged.

12. When using U-drills to drill holes, you can use workpiece rotation, tool rotation, and simultaneous rotation of the tool and workpiece. However, when the tool moves in linear feed, the most common method is to use workpiece rotation.

13. When machining on a CNC lathe, consider the performance of the lathe, and make appropriate adjustments to the cutting parameters, generally reducing the speed and low feed.
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