Thermodynamic Model of Self-Heating Mold for the Energy Efficient Composite Manufacturing

Kondratiev, Andrii; Purhina, Svitlana; Shevtsova, Maryna; Tsaritsynskyi, Anton

doi:10.1109/khpiweek53812.2021.9570105

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…The implementation of high-speed processing requires the provision of high dynamic characteristics of the controlled bodies of the machine tool [7]. The dynamic capabilities of the controlled axes of machine tool movement of operating bodies have a significant impact on the accuracy and quality of technological processing [8,9]. Investigations of the S-shaped laws of acceleration/deceleration and the influence of motion differential characteristics on the accuracy of trajectory movements confirm the need to increase the dynamic characteristics of the actuators of technological equipment [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Portal-Type Machine Tool Gear-Belt Gearbox

2022

IJOMAM

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Many modern technological processes are implemented at high speeds of the machine tool operating bodies relative to the workpieces. With significant dimensions of the processed parts, rack-and-gear drives are used. The design features of the rack-and-gear drive require coordination of the servo drive with the machine operating bodies movement speeds using a gearbox. This paper considers the possibility of creating a gear-belt gearbox for drives of highspeed equipment. The applied gearbox should not cause additional errors in the movement process. The work carried out experimental investigations of a servomotor dynamic characteristics and the qualitative characteristics of measuring encoders, the gearbox influence on the displacement error, machine tool axis movement. The dynamic characteristics of a servomotor without load, assembled with a gearbox and as part of a controlled axis of a portal-type machine have been investigated. It is determined that the delay time of the movement start is no more than 0.002 s for a servomotor without load and as part of a gearbox, and the delay time of the movement start of the gearbox output shaft does not exceed 0.003 s. It has been determined that the maximum possible acceleration of the controlled bodies of the machine during using the considered drive is 8 m/s 2 . The dynamic error of the axis movement along a straight trajectory does not exceed 0.023 mm, and along a circular trajectory -0.035 mm. The error of position determining for the operating body is no more than ±1 discrete. This indicates that the gearbox error is less than the error of the position measurement system used in the investigated machine.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Portal-Type Machine Tool Gear-Belt Gearbox

2022

IJOMAM

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Self-Heating Mould for Composite Manufacturing

et al. 2021

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The shipbuilding industry, engine manufacturing, aviation, rocket and space technology are promising fields of application for polymeric composite materials. Shape-generating moulding tools with internal heating are used for the creation of a more economically viable method of moulding of internally heated composite structures. The use of a fine-fibered resistive structure in the heated tools allows implementation of effective heating of the composite and elimination of the need for expensive and energy-intensive heating equipment. The aim of this paper was the reduction of energy consumption for internally heated moulding tools by choosing the optimal parameters for their resistive layer. A method for determination of the parameters of the moulding tool resistive layer was developed. This method allows calculation of the heating layer parameters and implementation of the specified time–temperature regime for moulding of the composite structure. It was shown that energy saving for the heated fiberglass shape-generating moulding tools was from 40 to 60%. It was found that the increase in the thickness of the moulded package of the polymeric composite material resulted not only in a higher supplied power for the heating system, but also in a complication of the method for system control, because of the growing exothermic effect of the binder curing reaction. For composite products based on Hysol EA 9396 binder, thicknesses more than 4 mm are critical, because it is not possible to cope with the self-heating effect only by cooling with ambient air already utilized at the twentieth minute of the moulding process. The influence of the physical and mechanical characteristics of the moulding tool material and stiffening ribs was analysed in terms of energy consumption and controllability of the heating system. Fiberglass shows the lowest energy consumption. Heating of the aluminium and steel moulding tools for the same purpose will require 20% and 45% more power, respectively. An increase in the number of stiffening ribs has a strong effect on the heat removal of the heating system. With a small number of aluminium ribs it is not possible to maintain the specified temperature–time regime for a fiberglass moulded package of 5 mm thick with the use of the equipment. However, when the number of stiffeners is increased to 10, the exothermic effect of the reaction becomes smoother and then the heating equipment can cope with the task. An experimental prototype of heating equipment of moulding tools for the manufacturing of structures of polymeric composite materials, as well as a flexible thermal blanket for repair of non-separable structures, were developed. The results can be the basis for a new method of optimal design of parameters of moulding tool structure at minimal heat removal to the environment.

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Thermodynamic Model of Self-Heating Mold for the Energy Efficient Composite Manufacturing

Cited by 2 publications

References 19 publications

Investigation of the Portal-Type Machine Tool Gear-Belt Gearbox

Investigation of the Portal-Type Machine Tool Gear-Belt Gearbox

Self-Heating Mould for Composite Manufacturing

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