Ejercicios en U

A U Drill, also known as an indexable insert drill or modular drill, is a precision cutting tool designed for efficient hole-making in CNC machining. Characterized by its U-shaped flute design and replaceable carbide inserts, it excels in drilling shallow to deep holes across various materials, including steel, stainless steel, aluminum, and composites. Unlike traditional twist drills, U Drills use a modular system with a durable tool body and interchangeable inserts, making them highly adaptable for high-speed and high-feed applications.

Advantages of U Drills: U Drills offer significant benefits that enhance machining efficiency. Their U-shaped flute design ensures superior chip evacuation, reducing clogging and enabling faster feed rates, which can cut cycle times by up to 70%. The replaceable insert system extends tool life and reduces downtime, as worn inserts can be swapped in minutes without replacing the entire drill. Additionally, U Drills provide excellent rigidity, allowing for high feed rates and larger processing diameters (up to 60mm), while delivering precise hole accuracy and superior surface finishes, often eliminating the need for secondary boring operations.

ONMY’s U Drills stand out for their premium quality and performance, crafted from high-grade materials to ensure durability and heat resistance. With a focus on innovation, ONMY offers a wide range of insert grades and geometries tailored to diverse materials and applications, supported by expert technical guidance. Backed by factory-direct sales, rigorous 6S management, and 24/7 after-sales service, ONMY ensures cost-effective solutions and reliable support, making their U Drills the ideal choice for achieving top-tier machining results.

Hole machining range:2D-6D
2D/3D/4D SP series insert machining hole range:14mm-70mm
2D/3D/4D WC series insert machining hole range:14mm-90mm
5D SP/WC series insert machining hole range:14mm-70mm
5D WC series insert machining hole range:14mm-70mm
6D WC series insert machining hole range:20mm-70mm
Supports integer and non-integer sizes
Support 40Cr and H13 raw materials

caveat

U-drills are easily burned when used off-center on a lathe.
When using a small-size U-drill, high speed and high feed are required. The lower the feed and speed, the higher the cutting resistance, and the easier it is to burn the tool.

U Drill Inserts

Inserto SOMT

Support SOMT050204，SOMT060204,SOMT070306,SOMT08T306,SOMT09T308,SOMT11T308,SOMT130408,SOMT150510 sizes.

WCMT Insert

Support WCMT030208,WCMT040208,WCMT050308,WCMT06T308,WCMT080412 sizes.

SPMG Insert

Support SPMG050204,SPMG060204,SPMG07T308,SPMG090408,SPMG110408,SPMG140512 sizes.

U Drill Bodies For SPMG Inserts

U Drill Bodies For WCMT Inserts

U Drill 3D Body 20mm Shank with WC Series Insert

U Drill 3D Body 20mm Shank with WC Series Insert.

U Drill 2D Body 20mm Shank with WC Series Insert

U Drill 2D Body 20mm Shank with WC Series Insert.

Different of WC&SP series insert

Optimized for deeper chipformer

Faster chip removal speed, which directly affects machining efficiency, deeper chip removal groove. Improvement in high feed and high speed, can still do not accumulate chips, not sticky insert, edge chamfer is smaller, optimize and improve the rigidity of the u drill body.

Precision design to inhibit insert wobble

Precise center and peripheral cutting edges can effectively inhibit oscillation when machining with uniform force; reduce the risk of tool bumping in difficult-to-machine material environments, and provide better accuracy/stability than general rapid drills.

Note: A insert with a peripheral edge cannot be used as a center edge; similarly, a center edge insert cannot be used as a peripheral edge; please be careful when replacing the edge.

Double screw oil hole high feed

The double helical oil holes protect the insert life and help to cool down the drill. The smaller the size of the rapid drill, the more important it is to follow a high RPM/high feed in order to minimize cutting resistance.

Póngase en contacto con nosotros para más información

U drill machining common formula

（Data for reference only）

Cutting speed (Vc)

Vc= Dc*π*n/1000

Dc(mm) :drill diameter
Vc(m/min): cutting speed
n(rev/min):rotating speed

Example

Spindle speed is 1600rev/min, the diameter of the drill is 20mm, the cutting speed is: Vc = Dc*π*n/1000 = 20*3.14*1600/1000 = 100 (m/min)

Feed speed (Vf)

Vf=Fr*n

Vf(m/min):feed speed
Fr(mm/rev):feed amount per revolution
n(rev/min):spindle speed

Example

The spindle speed is 1350 min-1 and the drill diameter Ø12, find the cutting speed.
(Answer)
Substitute the formula
vf=f×n=0.2×1350=270mm/min
This gives the spindle feed per minute as 270mm/min.

Hole processing time(Tc)

Tc= ld*i/n*f

Tc(min):machining time
i:number of holes
Fr(mm/rev):feed per revolution
n(rev/min):spindle speed
ld:drilling depth

Example

A hole Ø15, 30mm deep is drilled in SCM440 steel. The cutting speed is 50 m/min and the feed per revolution is 0.15 mm/rev. Find the drilling time.
(Answer)
Spindle speed n=(50×1000)÷(15×3.14)=1061.57min-1
Tc = (30 × 1) ÷ (1061.57 × 0.15) = 0.188
= 0.188 × 60 = 11.3 seconds to drill.

Metal removal rate(Q)

Q=Vc*Dc*Fn/4

Vc(m/min):cutting speed
Dc(mm):drill Diameter
Fn(mm/r):feed

u drill parameters

（Data for reference only）

Materials	Dureza	Cutting speed	U drill diameter
Materials	Dureza	Cutting speed	17.5-22	22.2-30	30.5-40	40.5-50
Steels	80-180	200-280	0.05-0.1	0.07-0.12	0.1-0.2	0.15-0.25
Steels	150-225	150-220	0.05-0.12	0.08-0.15	0.12-0.25	0.18-0.28
Low alloy steels	150-260	160-220	0.06-0.12	0.08-0.18	0.15-0.3	0.2-0.3.
High alloy steels	150-240	120-180	0.05-0.1	0.06-0.15	0.12-0.2	0.18-0.25
Stainless steels	150-250	100-200	0.05-0.1	0.07-0.12	0.12-0.2	0.15-0.22
Tool steels	170-270	120-200	0.05-0.12	0.07-0.15	0.12-0.22	0.15-0.25
Cast iron	160-220	120-180	0.1-0.17	0.15-0.2	0.18-0.25	0.2-0.3
Alloy cast iron	150-260	110-180	0.08-0.14	0.12-0.18	0.15-0.22	0.18-0.25
Aleación de aluminio	40-140	250-350	0.075-0.15	0.1-0.18	0.15-0.25	0.18-0.3
Cast aluminum	50-150	220-280	0.1-0.2	0.15-0.22	0.18-0.3	0.22-0.35

u drill processing power requirements

In order to truly utilize the machining effect of u drill, in addition to the toolholder and insert, you also need the right machine so that you can utilize the real machining ability of u drill.

Perforación de superficie irregular

Irregular

Utilice la broca más corta posible para minimizar las tendencias a la vibración y disminuir los efectos de la desviación
Valores iniciales recomendados para la velocidad de corte y el avance mínimo recomendado
No recomendado para 6-7×DC cuando el radio del cóncavo es igual o menor que el radio de la broca.

Convexo

Utilice la broca más corta posible para minimizar las tendencias a la vibración y disminuir los efectos de la desviación
Valores iniciales recomendados para la velocidad de corte y el avance mínimo recomendado
No recomendado para 6-7×DC cuando el radio del cóncavo es igual o menor que el radio de la broca.

Cóncavo

Utilice la broca más corta posible para minimizar las tendencias a la vibración y disminuir los efectos de la desviación
Valores iniciales recomendados para la velocidad de corte y el avance mínimo recomendado
No recomendado para 6-7×DC cuando el radio del cóncavo es igual o menor que el radio de la broca.

Taladrado transversal

Para orificios de distinto diámetro: taladre primero el orificio mayor para reducir la formación de rebabas.
Empezar con el avance más bajo recomendado durante el cruce de agujeros
No se recomienda en materiales de viruta larga debido a la evacuación de virutas al cruzar los orificios.

Superficies en ángulo o inclinadas, entrada

Utilice la broca más corta posible para minimizar las tendencias a la vibración y disminuir los efectos de la desviación
Comenzar con la velocidad de corte más baja recomendada y 1/3 del avance más bajo recomendado (o inferior) hasta que esté completamente engranado y luego volver al avance normal.
4-5×DC la entrada inclinada puede inclinarse hasta 15º
6-7×DC la entrada inclinada puede inclinarse hasta 10º

Superficies angulosas o inclinadas, salida

Utilice la broca más corta posible para minimizar las tendencias a la vibración y disminuir los efectos de la desviación
- Valores iniciales recomendados para la velocidad de corte y el avance mínimo recomendado (o inferior)
4-5×DC la salida inclinada puede inclinarse hasta 15º
6-7×DC la salida inclinada puede inclinarse hasta 5º

Taladrado de superficies curvas asimétricas

Utilice la broca más corta posible para minimizar la curvatura de la broca hacia el exterior desde el centro, similar a una superficie inclinada
Reducir el avance a 1/3 de la penetración inicial para superficies cóncavas
El radio de la superficie curva debe ser mayor que el radio de la broca
No recomendado para taladros 6-7×DC

Orificios pretaladrados

Para mantener la fuerza de corte equilibrada entre la plaquita central y la periférica a un nivel aceptable, el agujero pretaladrado no debe ser mayor que DC/4

stack drilling

Minimizing the gap between the stacked plates is crucial for successful stack drilling. This can be done by clamping or welding the plates together. A good common practice is to insert industrial paper (thickness of approx. 0.5-1 mm (0.020-0.039 inch)) between the plates to level out any irregularities and dampen vibrations. As the axial force will be several thousand newtons during the drilling process, the clamping supports are an important consideration.

U drill demonstrations from users around the world

Póngase en contacto con ONMY para crear su empresa

Eche un vistazo a cómo perciben nuestros productos y servicios algunos de nuestros clientes:

Nuestras ventajas

Nuevas materias primas, primer paso para controlar la calidad del producto.
Ventas directas de fábrica, se negó a intermediarios ganan diferencia de precio.
6S gestión, proceso estandarizado, la fuente para eliminar los productos problemáticos fuera de la fábrica.
Expertos profesionales en ventas resuelven la mayoría de sus problemas de mecanizado.
Garantía post-venta cualquier problema del producto 7 * 24 horas de servicio.

Ejercicios en U

caveat