Kennametal HPMC High Performance Tool Holder System
Kenner's HPMC holders are ideal for gripping all round-hand cutting tools and long shanks in a variety of applications. They are extremely versatile and are also end mills, reamers, indexable tools, drill bits, and straight shank lengthening. An excellent choice for handle and boring systems. HPMC milling shanks have powerful clamping torques that provide the best performance for demanding roughing/high metal removal applications with the same shank, as well as superior precision for finishing applications.
These holders provide internal cooling through the included support screws. The threads in the collet can be used with thrust screws to provide a high-precision balance for finishing operations where appropriate, while the neck sleeve can convert the same shank to a smaller grip size.
design:
The system consists of a core holder body, a needle roller support assembly and a thick-walled outer nut. The core shank theme has radial and axial grooves in the bore that acts as the main collet and compresses the circumference of the cutting tool, providing a very strong clamping force. The shank hole is compressed by the pressure of the needle roller support to form a small taper (approximately 4 degrees). The needle roller support is held in a positioner (4 degrees to achieve the largest contact surface) and the angle is exactly matched to the slightly inclined shank vertebral body. The nut support locator and its wall thickness are larger than the ball body of the collet body. As the nut rotates clockwise, the needle roller support device moves in the spiral direction and gradually climbs up the smaller vertebral body. There are no threads (nuts or collets) in the system. As the two vertebral bodies are forced together, a uniform, very large force is generated, which presses the collet body internally and clamps the cutting tool holder. The radial grooves assist in evenly bending the inner diameter inwardly, thereby increasing the clamping torque, increasing accuracy and significantly preventing wear. Oil contamination can be removed by axial grooves, minimizing the possibility of slippage due to residual oil on the tool holder. This force will continue to increase until the rear surface of the nut lowers the surface of the primary jaw body, which is the maximum clamping torque position. No need for a torque wrench, the small contact angle can produce a self-locking effect, so the chuck will not loosen during operation. The extremely high clamping force of the HPMC tool holder enhances the energy generated by the machine tool during the chuck transfer process. Ability. Therefore, vibration, degeneration, and jitter are minimized. Since the nut is locked, the cutting tool holder has no axial back pull, which is more advantageous than the spring jacket during the preset value because they have a pull-back effect on the cutting tool holder after locking.
The shank adds 5 to 10% of the clamping torque for "heavy" milling; at the same time, it has excellent versatility, allowing the same shank to be "finished". The key to most applications here is the “highest flexibilityâ€. In order to achieve the highest precision of the HPMC milling tool holder, the nut can be locked to the surface stop and then rotated 1/2 (semi) round to ensure the rear surface of the nut. The O-ring remains in contact with the surface of the collet. All HPMC milling shanks come with push-up screws (for length adjustment) or coolant supply.
These screws are designed with a conical surface and a reversible flat surface with an O-ring for coolant sealing options.
Heavy-duty milling position (O-ring just hits the end face of the chuck).
Best precision position (O-ring just hits the end face of the chuck and then retracts 1/8 to 1/4 turn)
Cutting tool requirements:
The outer diameter of the cutting tool holder and the inner diameter of the HPMC milling tool holder must be wiped clean with a clean, dry cloth before assembly. Any contamination will increase the top of the strip and reduce the clamping force.
Carefully confirm the cutting tools used in these holders to ensure that they do not exceed h6 (nominally -0.0005") in the diameter of the cutting tool holder. Use the tool as close as possible to the nominal value. The roundness of the shank should be less than 0.003 mm (0.0001"). A tool that is too small can create excessive profit and cause the tool holder to malfunction.
When the cutting tool is rounded and has no flat surface, the tool holder achieves optimum performance. It is also possible to clamp a cutting tool with a smaller plane, but the runout may increase. The slanted 2 degree side and flat cutting tool holders are recommended for use with necking. For optimum performance, the plane of the cutting tool holder should be kept to a minimum.
The milling shank must not be locked when there is no cutting tool in the hole. High clamping forces will result in permanent inner diameter deformation.
The maximum length of clamping is twice the diameter of the cutting tool holder. Too short a grip length may cause the cutting tool and the collet to break. If the cutting tool comes off the collet during use, it can also cause personal injury to the machine operator.
Maintenance operation:
The only maintenance required is to apply grease to the needle roller support.
1. Lock the nut clockwise to obtain clearance from the stop ring.
2. Remove the stop ring from the collet.
3 Loosen the nut counterclockwise and pull the nut assembly up from the collet.
4. Wipe off old grease from the milling chuck and all other components.
5. Reapply the needle roller support in the nut with high quality waterproof grease.
6. Reapply the grease to the outer diameter of the milling chuck where the nut is located.
7. Reinstall the nut onto the milling collet body and lock to form a gap that reinserts the stop ring.
8. Tighten and loosen the nut several times to re-check that the stop ring is installed correctly.
9. Wipe off any excess grease.
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