Recently several press builders developed gap and straight-sided metal forming presses that utilise the mechanical servo-drive technology. The mechanical servo-drive press offers the flexibility of a ...hydraulic press (infinite slide (ram) speed and position control, availability of press force at any slide position) with the speed, accuracy and reliability of a mechanical press. Servo drive presses have capabilities to improve process conditions and productivity in metal forming. This paper reviews the servo press designs, servo-motor and the related technologies, and introduces major applications in sheet metal forming and bulk metal forming.
Este trabajo pretende esclarecer los aspectos fundamentales del proceso de compresión de los bloques de tierra comprimida (BTC) y de las máquinas desarrolladas para tal fin. Para ello se presenta la ...percepción de diferentes fabricantes de prensas y bloques sobre la fuerza de compresión requerida para fabricar un BTC, se describe el funcionamiento de los mecanismos de acción de las prensas manuales e hidráulicas comercialmente disponibles en Sudamérica y se determina de manera analítica y experimental la fuerza máxima de compresión que estas prensas pueden aplicar. La evaluación de los resultados indica que la presión de moldeo de las prensas de accionamiento manual varía entre 3.8 y 8 kfg/cm2, la aplicada por las prensas hidráulicas de baja y mediana potencia entre los 9 y 32.4 kfg/cm2 y la producida por las prensas hidráulicas de alta potencia (hasta 11 kW) puede alcanzar los 64.7 kfg/cm2.
New Title from Wiley and IEEE CS Press Anon., Anon
IEEE transactions on knowledge and data engineering,
10/2009, Letnik:
21, Številka:
10
Journal Article
This article discusses a new technology of forming connector forgings from ZK60 magnesium alloy preforms by die forging on a screw press. The purpose of the study was to evaluate the feasibility of ...using preforms cast from the ZK60 magnesium alloy to forge a connector forging with improved mechanical properties compared to those obtained by casting. It also aimed to establish whether this new forging method has the potential for replacing the multi-stage forging process conducted on hydraulic presses used for high-strength Mg alloys. A numerical analysis of the proposed approach was performed by the finite element method, applying the popular DEFORM computer software for simulating forming processes. The numerical results confirmed that the developed method produces parts with the desired shape. The numerical results also provided information regarding the behavior of the workpiece's material and the screw press forging process, including the distributions of strains and temperatures, the Cockcroft-Latham damage criterion, and energy required to form connector forgings. The proposed screw press forging process for producing ZK60 alloy connectors from cast preforms was verified by experimental tests. The connector forgings produced from the ZK60 magnesium alloy were then subjected to qualitative tests.
