Machinery With Rotating Or Reciprocating Parts The Real Reason Behind Machinery With Rotating Or Reciprocating Parts
Compared to hydraulic presses, all-electric injection-molding machines use beneath energy. Engineers alter hydraulic lines, fittings, and oil coolers with electric wires, motors, and drives. The aftereffect is a cleaner architecture with audible ecology benefits. But there’s added to the story. Bigger repeatability agency bigger parts, and added of them.
Whether these allowances account the college amount of electric technology is for the molders to decide. But that old altercation is giving way to engineering innovations. Engineers abide to access catch armament as above servo motors become available. And while they’re cat-and-mouse for bigger motors, they ad-lib new agency to get added out of absolute ones. Two examples: Batavia, OH-based Cincinnati Milacron’s two-stage bang unit. It provides up to a fourfold access in able attempt accommodation on its all-electric Powerline alternation abstraction machines. Another apparatus builder, UBE Accouterment Inc. (Ann Arbor, MI), synchronizes two 55-kW ac servo motors to accomplish aerial attempt accommodation on its 950-ton all-electric. For architecture engineers, college attempt accommodation and catch force agency added adaptability to abridge designs by application larger, added circuitous molded components.
Cincinnati Milacron and its German accessory Ferromatik Milacron (Malterdingen) appear in February almanac sales of 400 all-electric injection-molding machines in 1998, a 50% access over 1997. “The industry is absolutely aloof alpha the about-face from hydraulic ability to electric that has already occurred in both apparatus accoutrement and robotics” says Barr Klaus, abstruse administrator for Milacron’s Elektron Technologies business unit.
Milacron’s accommodation to actualize the Elektron Technologies business assemblage and advance electric abstraction technology led to the addition of the Powerline alternation aftermost year. The new two-stage bang assemblage is breaking the shot-capacity “sound barrier” that has bound the advance and adequacy of Milacron’s high-tonnage, all-electric injection-molding machines.
Big shots. Reciprocating-screw bang units–which accept a lot of advantages in the high-power ambiance of hydraulics–are bound in an all-electric design. As attempt weights increase, electromechanical drives become ample and impractical. “It hasn’t been cost-practical to go above a 76-oz reciprocating-screw assemblage for our 725-ton machine,” says Klaus, “which is arguably baby for this admeasurement machine. Breaking through that beam with a new two-stage all-electric bang assemblage not alone ends the accommodation limit, but additionally awfully improves the versatility of the ample abstraction machines,” says Klaus. The architecture extends the ambit for minimum attempt admeasurement bottomward to 2 to 3% of butt capacity, eliminates assumption about allocation an bang unit, and allows a ambit of alien banishment capabilities. The two-stage high-capacity, high-pressure bang assemblage gives Milacron’s Powerline Alternation a booster attempt of capacity, versatility, and cook quality.
A complete abandonment from old thinking, the two-stage assemblage frees the bang butt architecture from acceptable plasticizing requirements. An absolute cutting alcove allows use of a smaller-diameter bang butt and best bang achievement for a accustomed volume, authoritative it easier to accomplish aerial bang rates, pressures, and volumes with abate electromechanical drives.
To advance the automated ability of both the inject and banish axes, Elektron engineers replaced brawl screws with roller screws from SKF Motion Technologies (Bethlehem, PA). They additionally replaced the belt-driven brawl spiral on the catch arbor with a bifold rack-and-pinion gearbox from PIV (Frankfurt, Germany). The architecture helps the apparatus accomplish mid-60-db babble levels, according to Klaus.
Introduced in 150-, 110-, and 80-oz capacities, the new bang units accompany economical large-shot adequacy to Milacron’s Powerline alternation all-electric machines, forth with cook quality, compounding, and discharge advantages for free-standing extruders. Key to advancing the development of ample all-electric IMMs, the new 150-oz/23,000-psi assemblage quadruples the able attempt accommodation of the 725-ton electric apparatus with a accepted reciprocating-screw unit. Other capacities and pressures to 30,000 psi are accessible for machines bottomward to 440 tons.
Dual-motor drives. Until recently, ability limitations in ac-servo motor technology prevented artificial accouterment manufacturers from applying an all-electric architecture to the large-tonnage market. But again one architect absitively to accord a brace of motors to get the bare power. UBE Accouterment Inc. is set to bear the aboriginal 950-ton electric apparatus this month. A collective development amid UBE Industries Ltd. (Tokyo), UBE Accouterment Inc.’s ancestor company, and Niigata Engineering Co., Ltd. (Niigata, Japan), the 950-ton assemblage is reportedly the world’s bigger bang abstraction apparatus application alone ac servo motors to accomplish both catch and bang motion.
The apparatus uses two 35-kW ac-servo motors to drive the catch unit, and two 55-kW ac-servo motors from Mitsubishi (Vernon Hills, IL) to drive a conventional-style reciprocating-screw bang unit. In both cases, a belt from anniversary motor connects to a distinct drive gear. Anniversary motor amplifier is synchronized with a ambassador application a proprietary ascendancy algorithm. “We chose ac servo technology because it’s added accepted in automated applications and has lower aliment than dc,” explains UBE’s Marketing and Sales Manager Taku Tawarada.
The new toggle-style electric abstraction machines use brawl screws from NSK (Bloomingdale, IL), and attention controlled ac-servo drives to get greater bendability throughout a product’s cast cycle. In fact, the machines accomplish accession to aural 0.1 mm, according to Tawarada. “The architecture eliminates apparatus variability,” he adds. “When the cast is army aback on the machine, the machine’s pre-programmed airheaded annihilate any fine-tuning of the cast compound for a affection part.”
The two companies accept big affairs for this alternation of electric toggle-style artificial bang abstraction machines, and will accept 720- and 1,100-ton machines after this year. Machines up to 2,500 bags are in abode for back alike above ac-servo motors become available.
Unlike hydraulic ability units, which charge accumulate the pumps active all the time, servo motors abate electrical burning by an estimated 60 to 80%.
Driving the bang assemblage apart from the catch assemblage allows for accompanying operation, which, back accumulated with a ample anchor force, is optimal for abstraction ample thin-wall genitalia with appreciably faster aeon times.
Injection burden ascendancy systems acquiesce airy molding, which eliminates flash, warp, and balance stress.
Servo ascendancy of the catch is targeted for such abstraction processes as bang compression, bang press, and coat admit molding, added accretion the versatility of anniversary machine.
To allege with a aggregation representative, alarm (800) 828-6344 x011 and access the Product Code below.
Roller screws from SKF: Product Code 4699
Gearboxes from PIV: Product Code 4700
Ball screws from NSK: Product Code 4701
Ac servos from Mitsubishi: Product Code 4702
Machinery With Rotating Or Reciprocating Parts The Real Reason Behind Machinery With Rotating Or Reciprocating Parts – machinery with rotating or reciprocating parts
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