Mechanical servo press technology for metal forming

Osakada, Kozo; Mori, Ken-ichiro; Altan, Taylan; Groche, Peter

doi:10.1016/j.cirp.2011.05.007

Cited by 245 publications

(98 citation statements)

References 44 publications

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“…The forming load dropped to 0 and the temperature of semisolid slurry decreased by about 15 • C. During the short holding for 4 s, increase of solid fraction was attributed to the combination of solid particles with the ones surround them. This microstructural evolution was mainly attributed to the partial solidification of the liquid 02001-p. 3 phase in this stage. In the Slow secondary compression, the partial dendritic solidification of liquid phase and combination of solid particles continued owing to the lower strain rate.…”

Section: Time-dependent Rheoforgingmentioning

confidence: 99%

“…Mechanical servo presses combining the flexibility of a hydraulic press and the reliability of a mechanical press, are widely applied in metal forming [2]. Compared with the conventional hydraulic machines, the mechanical servo presses exhibit several advantages including higher product accuracy, better machine reliability, and less noise [3]. Owing to the controllable free motion capability of a mechanical servo press, it can be employed to manufacture two types of aluminum alloy samples with homogeneous microstructure in semisolid state [4].…”

Section: Introductionmentioning

confidence: 99%

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Time-dependent rheoforging of A6061 aluminum alloy on a mechanical servo press and the effects of forming conditions on homogeneity of rheoforged samples

Meng

Sugiyama

2015

MATEC Web of Conferences

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Abstract. The solid and liquid phases in semisolid metal slurry exhibited different forming behaviours during deformation result in products with inhomogeneous quality. A6061 aluminum alloy was forged in the semisolid state on a mechanical servo press with the capability of multistage compression. To improve the homogeneity of rheoforged samples a time-dependent rheoforging strategy was designed. The distributions of the microstructure and mechanical properties the samples manufactured under various experimental conditions were investigated. The A6061 samples forged in the temperature range from 625 to 628 • C with a short holding time of 4 s and the upper die preheated to 300 • C exhibited a homogeneous microstructure and mechanical properties. The homogeneity of rheoforged samples resulted from the controllable free motion capability of the mechanical servo press and the adjustable fluidity and viscosity of the semisolid slurry.

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Section: Time-dependent Rheoforgingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time-dependent rheoforging of A6061 aluminum alloy on a mechanical servo press and the effects of forming conditions on homogeneity of rheoforged samples

Meng

Sugiyama

2015

MATEC Web of Conferences

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“…According to the planning path and motion parameters, the table of NC turret punch moves to desired position [1,2]. The above motion control system has the characteristic of good reliability, open and universality and can be explanted easily to all kinds of development of motion control system such as engrving machine, NC machine tool and so on.…”

Section: Introductionmentioning

confidence: 99%

Motion Control System of NC Turret Punch Feeding Mechanism Based on Motion Control Card

Cao¹,

Zhong²,

Han³

et al. 2017

dtmse

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Abstract. According to the characteristics and requirements of NC turret punch feeding mechanism, the open NC system architecture is constructed based on the mode of PC and motion control card. The structure of hardware system is built with DMC1410 motion control card. The movement pattern of trapezoidal velocity curve and S velocity curve are analyzed. The flow chart and the software module of motion control system of NC turret punch feeding mechanism are presented. Under the support of MFC provided by VS2015 and movement function library provided by DMC1410 motion control card, the software of motion control system is developed.

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“…A hydraulic press is typically used for the press-forming of a thermoplastic composite because it is considered that the main task is applying pressure during cooling of the composite. Conversely, a mechanical servo-press is widely used in the field of sheet metal forming for the mass production of automobile parts because it offers high-speed motion and flexible, precise slide motion [17][18][19]. For the future high-cycle production of CFRTP parts, the applicability of a mechanical servo-press for the press-forming of CFTP should be investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Press Slide Speed and Stroke on Cup Forming Using a Plain-Woven Carbon Fiber Thermoplastic Composite Sheet

Yoneyama¹,

Tatsuno²,

Kawamoto³

et al. 2016

Int. J. Automation Technol.

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Int. J. of Automation Technology submitted 1Carbon-fiber-reinforced thermoplastic (CFRTP) is viewed as a prospective material for high-cycle production of CFRP parts. This paper deals with a process whereby a preheated thermoplastic plain-woven carbon fiber fabric sheet is formed into a circular cup by a mechanical servo-press. The effects of press parameters, specifically the bottom dead center and slide speed in the forming of CFRTP cup, on the press load, pressure, internal temperature, shape accuracy, and internal structure have been investigated. A plain-woven carbon-fiber-reinforced PA6 thermoplastic sheet was used. The sheet consisted of four layers of woven 3K carbon and had a thickness of 1 mm. The sheet was heated to 320 °C under a halogen heater so that it would be around the recommended temperature for forming 260 °C after transfer to the mold. The sheet was pressed into a circular cup shape by a cold mold while the periphery was cramped by a heated holder so as not to cool the sheet before it was pulled into the mold cave. Die clearance was designed considering the thickness increase due to the fiber concentration during the forming. By increasing the slide stroke to the bottom dead center, the applied press load was increased and the internal structure was improved, showing no voids. By increasing the slide speed, the final press load was reduced and shape accuracy was improved through a good pressure distribution on the mold. Measurement of the surface temperature of the sheet during the forming revealed that it remained in the melting region of the resin in the case of fast slide speed, but dropped below the melting temperature in the case of low slide speed. This difference apparently led to spring-in or spring-back after the forming. The experimental results indicate that appropriate balance among press speed, bottom dead center, and sheet temperature is important in the high-cycle forming of CFRTP.

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Mechanical servo press technology for metal forming

Cited by 245 publications

References 44 publications

Time-dependent rheoforging of A6061 aluminum alloy on a mechanical servo press and the effects of forming conditions on homogeneity of rheoforged samples

Time-dependent rheoforging of A6061 aluminum alloy on a mechanical servo press and the effects of forming conditions on homogeneity of rheoforged samples

Motion Control System of NC Turret Punch Feeding Mechanism Based on Motion Control Card

Effect of Press Slide Speed and Stroke on Cup Forming Using a Plain-Woven Carbon Fiber Thermoplastic Composite Sheet

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