Makino has released its UPN-01 ultra-precision horizontal wire EDM for micro tolerance and fine surface finish applications. "Designed with a unique horizontal wire feed system, this sub-micron level precision wire EDM provides reliable unattended operation even when working with wire diameters as fine as 0.00078 inches (0.02 mm)," said a company spokesperson. "Its oil dielectric configuration also makes it an ideal solution for high-accuracy machining of carbide and other hardened materials."
"The UPN-01 pursues the ultimate in precision micro machining, advancing closer to the world of 0.1 um machining," said Brian Pfluger, Makino's EDM Product Manager. "It delivers fine surface quality and superb accuracy every time - achieving a best surface finish of 0.17 um Rz and accuracies as fine as +/-0.5 um. This level of capability is ideal for manufacturers of fiber optics, electronic connectors, medical components, micro molding and other high-accuracy machining applications."
The UPN-01 machine XYZ travels are 6.29" (160 mm), 6.29" (160 mm) and 1.96" (50 mm), with additional U- and V-axis travels of +/- 0.27" (7 mm). The UPN-01 will accommodate a maximum workpiece size of 5.90" x 5.90" x 1.57" (150 x 150 x 40 mm) with a maximum payload of 17.63 lbs. (8 kg), which includes the tool holder.
The machine is also configured with a precision rotary C-axis, which is used for holding and indexing of the workpiece, and provides rotational positioning accuracies of +/-2 arc seconds. Due to the machine's horizontal configuration, the conventional worktable configuration is replaced with a frame or clamp style tooling system, which can also be automatically exchanged using the optional 16-station Automatic Work Changer (AWC) system.
The UPN-01's wire diameter range is 0.00078~0.00393" (0.02~0.1 mm) with a minimum start hole diameter of 0.00118" (0.03 mm). According to the company, reliable and consistent automatic wire threading is achieved by using an air injection and suction system. The maximum taper angle capability is +/-6° with a 0.00393" (0.1 mm) wire diameter and 1.57" (40 mm) plate thickness.
The UPN-01 features a thermal control system that maintains constant dielectric and casting temperatures. A tightly sealed and insulated machine cover system and high-performance air conditioner control the internal machine and work zone environment temperatures to within +/-0.5°C. This isolates the effects of the ambient air fluctuations during operation, and helps ensure high-accuracy machining by maintaining a stable machine attitude even during long hours of operation.
The UPN-01 incorporates a new motion control system that incorporates pneumatic static pressure guideways and linear motor technology. The pneumatic guideway system, which is similar to high-accuracy coordinate measuring machines (CMMs), is designed to minimize mechanical friction and help ensure consistent high-precision movement for fine feeds while eliminating the need for oil lubrication. Makino also engineered the UPN-01 with a linear motor system designed to further reduce movement friction and movement inertia to attain sub-micron level accuracy. According to the company, the linear motor system is not designed for rapid movement, but has been purpose-built to deliver the smallest possible movement increment while overcoming traditional linear motor issues of heat generation and repulsive cogging torque of the magnetic forces.
The machine's movement positioning and repeatability accuracy is rated at +/-0.00002" (+/-0.5 um). The machine also uses a 0.0000004" (0.01 um or 10 nanometer) scale feedback system, which provides a minimum programmable increment of 0.000004" (0.1 um). The UPN-01 is capable of achieving a mechanical movement roundness of 0.000008" (0.2 um).
The UPN-01's oil-based dielectric design heightens the control of the machining spark gap for enhanced accuracy and finish quality. The machine is also fitted with Makino's newly developed MGW-V1 NC power supply unit designed to produce ultra-small electrical discharge pulses at 50 nanosecond cycles. Together, these features provide the precision necessary to machine micro slot details with a finish width of 0.0013" (32 um) using a 0.00078" (0.02 mm) diameter wire.
The UPN-01 wire EDM machine contains several standard and optional features designed to facilitate long hours of unattended, precision micro machining.
The machine's horizontal wire feed system allows for automatic threading of fine wire diameters as small as 0.00078" (0.02 mm). This is achieved using a combination of forced air through the workpiece, and simultaneously clean start holes to eliminate troublesome wire guide maintenance. Through this methodology, a 0.02 mm diameter wire can be threaded through a correctly positioned 0.03 mm diameter start hole.
Simple, automatic core or slug removal is another benefit of the horizontal design. By suspending the workpiece vertically, gravitational pull helps to evacuate cores from the work zone. This also helps to prevent wire break as the core or slug separates from the base material, as the blank will fall away from the wire and not create a wire pinching condition. In situations where cores are wedged between workpiece walls, an automatic jet nozzle will use dielectric fluid to flush out materials up to 0.59" (15 mm) square in size, and the slug is allowed to fall freely to the bottom of the work tank where it will not cause any interference or crash potential. An extruding pin fitted with a sensor confirms core removal to facilitate completely unattended operation from roughing to finish machining. The evacuated cores can then be lifted up and recovered from the machine without sticking a hand into the dielectric fluid.
The UPN-01 does not contain a conventional machine table, but instead uses special palletized tool holders to suspend the workpiece. The workpiece is loaded and unloaded in the machine using a pneumatic chuck system. The UPN-01 can also be equipped with several optional features for improved efficiency in unattended high-accuracy machining, such as the 16-station automatic workpiece changer.
"The UPN-01 also features Makino's new Hyper i control system, which features a user-friendly interface similar to that found on tablets and smart phones, making operation intuitive and straightforward," said a company spokesperson. "A large 24 inch class HD touch-screen display provides a commanding view for operation, and the Hyper i control also features many helpful intelligent tools for the operator. Digital onboard electronic manuals, instructional training videos and advanced process control functions provide the operator with all of the resources necessary to remain highly productive."
For more information contact:
Mark Rentschler
Makino Inc.
7680 Innovation Way
Mason, OH 45040
800-552-3288
www.makino.com
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