High-speed Clamping Mechanism of the CNC Lathe with Compensation of Centrifugal Forces

Al-Quraan, Tareq M. A.; Kuznetsov, Yu. L.; Tsvyd, Taras

doi:10.1016/j.proeng.2016.07.081

Cited by 13 publications

(9 citation statements)

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“…Therefore, achieving a minimum but safe clamping force is a critical factor in controlling the process. The operation principles of both new and improved clamping mechanisms of the CNC lathe with the automatic reinstallation workpiece manipulation are described in the article [18].…”

Section: Literature Reviewmentioning

confidence: 99%

Mathematical Model of the Tensioning in the Collet Clamping Mechanism with the Rotary Movable Input Link on Spindle Units

Prydalnyi

Sulym

2021

JES

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Increasing machining productivity causes the cutting forces acting on tools or workpieces to grow and requires extra clamping forces for their fixation reliably. In the research, a mathematical model of the operation of the clamping mechanism for fixating cylindrical objects on the spindle of machine tools at the stage of tension is presented. The presented design of the mechanism contains screw gear and provides self-braking. Based on the calculation model, mathematical dependencies are developed to describe the relationship among the movements of the parts of the mechanism when clamping forces are growing. The presented analytical dependencies allow considering the stage of growing clamping forces separately when the conservative type of forces are prevailing in the mechanism’s operation. That stage of work when both types of forces of dissipative and potential characters exist is considered. The developed dependencies describe the position of parts of the clamping mechanism depending on the generalized coordinate. The angle of rotation of the input rotating link is used as the generalized coordinate. This fact allows calculating the position of the elements of the clamping mechanism of this type depending on time. Results of the research enhance understanding the pattern of the change in the interaction of the elements and forces that act in the mechanism during the final stage of clamping. The obtained mathematical dependencies are a precondition for the development of design methodology for mechanisms of this type.

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Section: Literature Reviewmentioning

confidence: 99%

Mathematical Model of the Tensioning in the Collet Clamping Mechanism with the Rotary Movable Input Link on Spindle Units

Prydalnyi

Sulym

2021

JES

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show abstract

“…The vertical lathe, commonly referred to as a vertical boring mill, has a circular table which revolves around a vertical axis so that the work holding surface is horizontal, thus making it comparatively easy to place and hold large circular parts in position [1] .…”

Section: Vertical Lathe Machinementioning

confidence: 99%

“…Alquraan. T, et.al, said that the chuck designs can be used for high speed cutting and it is apt for CNC lathes [1] . Dimitrov, Dimitar, et.al in their study suggested that retrofitting of tool holder with multiple tool holder with standard setup will be very helpful and reduce the non-value-added time [5] .…”

Section: Introductionmentioning

confidence: 99%

Retrofit of two way holding chuck to improve process efficiency and resource management

Nishal

Prasad

Balaji

et al. 2021

Materials Today: Proceedings

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In today’s industrial scenarios, having continuous improvement to increase the process efficiency is one of the key measures. Especially manufacturing and automotive industries are putting forth a lot of resource and time to improve the efficiency of the process without compromising the current production capacity and improve the quality rate. This paper deals with a case study of retrofitting a two-way chuck in a vertical lathe machine and thereby calculating the overall equipment effectiveness of the entire automated process in piston manufacturing. The current automated production line of piston manufacturing is being analysed with the help of value stream mapping (VSM). Value stream mapping is widely used by the industrial persons to identify the wastes i.e., non-value-added time in the process line. The Critical to Quality (CTQ) parameters in an efficient production line such as lead time, value added time, transfer time and takt time have taken into account for identifying the places of improvement. A new retrofitted design has been suggested which can increase the production efficiency of the current system with effective utilization of available resources. After implementing the modified retrofit design, the subsequent changes in the process line have also been stated through Future state VSM, which clearly indicates the reduction in drop to drop time between the cells which has been considered as the non value added time in the current system. Studies like these shows that effective utilisation of available resources through retrofitting can greatly assist the manufacturers to reduce their cost of additional investment and be sustainable among the growing competitors in the market.

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“…In the case of the plane sliding system it is immediate that the stress distribution is a linear one, the distribution of the stress in the cross over section being related with the value of forces and the coordinates of the pressure point where they are applied [13][14][15].…”

Section: Distribution According To a Polynomial Functionmentioning

confidence: 99%

Comparative study of tool machinery sliding systems; comparison between plane and cylindrical basic shapes

Glăvan

Babanatsas

Merce

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The paper brings in attention the importance that the sliding system of a tool machinery is having in the final precision of the manufacturing. We are basically comparing two type of slides, one constructed with plane surfaces and the other one with circular crosssections (as known as cylindrical slides), analysing each solution from the point of view of its technology of manufacturing, of the precision that the particular slides are transferring to the tool machinery, cost of production, etc. Special attention is given to demonstrate theoretical and to confirm by experimental works what is happening with the stress distribution in the case of plane slides and cylindrical slides, both in longitudinal and in cross-over sections. Considering the results obtained for the stress distribution in the transversal and longitudinal cross sections, by composing them, we can obtain the stress distribution on the semicircular slide. Based on the results, special solutions for establishing the stress distribution between two surfaces without interact in the contact zone have been developed.

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High-speed Clamping Mechanism of the CNC Lathe with Compensation of Centrifugal Forces

Cited by 13 publications

References 0 publications

Mathematical Model of the Tensioning in the Collet Clamping Mechanism with the Rotary Movable Input Link on Spindle Units

Mathematical Model of the Tensioning in the Collet Clamping Mechanism with the Rotary Movable Input Link on Spindle Units

Retrofit of two way holding chuck to improve process efficiency and resource management

Comparative study of tool machinery sliding systems; comparison between plane and cylindrical basic shapes

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