A new approach to determine press stiffness

Arentoft, Mogens; Wanheim, Tarras

doi:10.1016/s0007-8506(07)60099-7

Cited by 23 publications

(11 citation statements)

References 3 publications

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“…For δ2 = 0.03 mm [18], the tile angle of the slide is α ≈ (δ − δ2)/(l/2) = 4.038 × 10 −4 rad. According to Equation (16), the maximum allowable lateral force acting on the guide rails was calculated, and [Fp] is 1.94 × 10 5 N. Then, the maximum eccentricity, e, in the X direction is 100 mm. According to Equation (13), the eccentric force on the pillar is F1x = 1.83 × 10 5 N < [Fp].…”

Section: The Pillars Optimization In Slide Guide Systemmentioning

confidence: 99%

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Design and Optimization of the Slide Guide System of Hydraulic Press Based on Energy Loss Analysis

et al. 2016

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Abstract:The clearances in the slide guide system of a hydraulic press are one of the significant factors affecting its accuracy. These clearances also affect the energy consumption of the press. An energy loss model that considers the oil leaks and friction associated with these clearances was proposed, and the size of clearances was optimized based on the model. The maximum allowable eccentric load and the energy loss on the wedge clearance condition were calculated to ensure the slide and guide pillars function properly. The stiffness of pillars and wear of guide rails were checked under an eccentric load condition. A case for rapid sheet metal forming with a 20 MN hydraulic press was examined. For this case, the optimum fit clearances were found to be approximately 0.4 mm. The energy loss under an eccentric load condition was increased by approximately 83% compared to a non-eccentric load condition. The pillars were optimized by reducing excessive stiffness, which served to decrease the pillar weight by nearly 20%.

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Section: The Pillars Optimization In Slide Guide Systemmentioning

confidence: 99%

“…For example, Arentoft et al proposed a new procedure for measuring press stiffness, including separated horizontal and vertical loading of the press frame. The load can be eccentrically positioned for measuring rotational stiffness [16].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of the Slide Guide System of Hydraulic Press Based on Energy Loss Analysis

et al. 2016

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“…To determine compliance parameters under static loads, norms for forming presses have existed since 1988. Arentoft and Wanheim showed one possibility to determine a press stiffness matrix. This serves as an input for simulations and represents the behavior of the forming machine.…”

Section: State Of the Artmentioning

confidence: 99%

Experimental and Numerical Determination of Roll Forming Loads

Groche

Mueller

Traub

et al. 2013

steel research int.

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Metal forming companies are confronted with increasing customer requirements and qualitative demands. In the course of tighter tolerances and use of harder materials the roll forming process need to be aligned optimally to the profile's specification. Especially in the case of complex cross‐sections the simulation of the forming process is a valuable aid. One challenge of reliable simulations is the consideration of the interaction between sheet metal and tools. Due to their simplification, e.g., missing roll compliance, rigid body models cannot describe the profile – tool interaction sufficiently. This can lead to big differences between experimentally and numerically obtained loads and stresses. Since verification possibilities are unavailable, a consideration of the mill compliance in simulation models has rarely been considered, if at all. This paper shows options to respect the compliance of roll forming mills in simulations. For verification of the load parameters, e.g., contact normal stress, standardized, and new measuring methods are applied.

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“…For large size machine tool, reduced structural stiffness compared to smaller machine tool is one of problems to be resolved because deflection of a machine structure rises as an exponential function of its dimension while the allowable deflection increases linearly [9]. In the past decades, many researchers have studied machine tool stiffness evaluation methodologies and design optimization for high structural rigidity and lightweight [2][3][4][5][6][7][8]. Machine tool stiffness evaluation method [3,4] by determining the compliance frequency response function at TCP is a more economical and analytical way than that by a direct cutting test.…”

Section: Introductionmentioning

confidence: 99%

Test and Evaluation of Stiffness of a Pin Turning Device for Large Marine Engine Crankshafts

Choi

Ha²,

Kim³

et al. 2013

JPEE

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In order to prevent unwanted excited vibrations and to secure better machining precision in large size heavy duty machine tools dynamic stiffness is one of the most desirable and critical properties. In the past decades, many researches on machine tool stiffness test and evaluation methodology have been made. However any methodology for a Pin Turning Device (PTD), which is a special kind of turning lathe for machining big size crankshaft pins, is rarely found among them. This study proposes a test and evaluation process of stiffness of a PTD by measuring frequency response function at the tool center point (TCP). For conformance proving for the proposed methodology, stiffness of a PTD obtained by the proposed method with impact hammer test (IHT) has been compared with that determined by FEM.

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A new approach to determine press stiffness

Cited by 23 publications

References 3 publications

Design and Optimization of the Slide Guide System of Hydraulic Press Based on Energy Loss Analysis

Design and Optimization of the Slide Guide System of Hydraulic Press Based on Energy Loss Analysis

Experimental and Numerical Determination of Roll Forming Loads

Test and Evaluation of Stiffness of a Pin Turning Device for Large Marine Engine Crankshafts

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