A case study on implementation of walking worker assembly line to improve productivity and utilisation of resources in a heavy duty manufacturing industry

Deepak, A.; Srivatsan, R.; Samsingh, V.

doi:10.5937/fmet1704496d

Cited by 11 publications

(12 citation statements)

References 4 publications

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“…Studies [10] prove the positive effect of increasing assembly accuracy on the efficiency and load capacity of robotic mechanisms. Improving assembly accuracy is especially important in the context of mass production, which is based on assembly lines of various types [11]. In this paper, three main types of assembly lines are considered and directions for their improvement are indicated.…”

Section: Prerequisites and Means For Solving The Problemmentioning

confidence: 99%

“…assembly time. Equation (11) in coded variables shows the statistical relationship between the optimization parameter -assembly time and the factors, i.e. modes of scanning the mismatch zone of the parts.…”

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

“…By analyzing the value and sign of each regression coefficient (11), it is possible to obtain reliable information (since the adequacy of the model was verified by Fisher's criterion) about the influence of factors on the optimization parameter and to develop a strategy for finding the extremum of the objective function. In equation (11), the coefficients of the variables x 1 and x 2 are positive. This means that an increase in the assembly force and vibration amplitude of the robot gripper causes an increase in the assembly time of the parts.…”

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

“…The negative sign of the coefficient at the factor x 3 that reflects the rotation speed of the gripper (and hence the scanning speed of the mismatch zone of the assembly objects) indicates that an increase in the scanning speed causes a decrease in the assembly time. The regression coefficient b 12 = 0,05 in equation (11) with interaction factors shows that the assembly time (more precisely y = ln t) will increase if the factors x 1 and x 2 (i.e., the assembly effort and vibration amplitude) are simultaneously at the upper or lower levels of their values (see also Table. 1). The opposite effect takes place with a pair interaction of factors x 2 x 3 (amplitude and speed of rotation), because b 23 = -0,073 < 0.…”

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

“…The data obtained make it possible to determine the direction of the search for quasi-optimal assembly modes, but do not make it possible yet to determine their specific values. To solve this problem, it is necessary to transform the regression equation (11) into a function of the dependence of the assembly time on the modes in natural measurement of parameters. For this purpose, we substitute the coded values of the variables (8) into the regression equation (11) and, after transformation, we obtain the equation:…”

Section: Analysis Of Oscillograms Of the Assembly Of Partsmentioning

confidence: 99%

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Experimental studies of robotic assembly of precision parts

Polishchuk¹,

Tkach²

2021

FME Transactions

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At present, robotization of assembly processes is achieved through the use of industrial robots with high positioning accuracy in conjunction with tactile means of adaptation to the conditions of assembly of precision parts. The cost of such robots is many times higher than the cost of simple robots with low positioning accuracy of the robot arm. The research in this article is aimed at reducing the cost of assembly processes for precision parts by applying the position correction of the connected parts not by the robot hand, but by an additional technological module that is installed on the manipulator of a simple robot and performs high-speed stochastic mismatch scan of assembly objects. The article presents the results of a full factorial experiment of the process of joining precision cylindrical parts with a gap of no more than 3...5 microns. A regression model of this process is proposed, a formula for calculating the quasi-optimal modes of precision assembly and graphanalytical dependences of the assembly time on the scanning modes of the misalignment of assembly objects are given. The proposed high-speed method for compensating for the positioning error of an industrial robot makes it possible to assemble precision parts in a very short time within 1...3(s). The main economic effect of the research results is that the device for scanning the misalignment of assembly objects, which is installed on the arm of an inexpensive robot with a low positioning accuracy, can significantly increase the assembly speed and reduce capital investments in robotic assembly of high-precision parts.

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Section: Prerequisites and Means For Solving The Problemmentioning

confidence: 99%

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

Section: Building a Regression Model Of The Response Functionmentioning

confidence: 99%

Section: Analysis Of Oscillograms Of the Assembly Of Partsmentioning

confidence: 99%

See 3 more Smart Citations

Experimental studies of robotic assembly of precision parts

Polishchuk¹,

Tkach²

2021

FME Transactions

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Application of Single Minute Exchange of Die to Reduce Changeover Time in a Winding Machine of a Capacitor Line

Shilpa,

Shivakumar,

Hamritha

et al. 2023

Lecture Notes in Mechanical Engineering

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Walking worker vs fixed worker assembly considering the impact of components exposure on assembly time and energy expenditure

Calzavara

Faccio

Persona

et al. 2021

Int J Adv Manuf Technol

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Recently, the need for assembly systems of better following the market demand has led to the spread of alternative solutions with respect to the traditional fixed worker strategy. Walking worker systems, where operators move across the line to produce the finished product, are gaining always more interest. In this paper, a comparison between the fixed worker (FW) and the walking worker (WW) assembly strategies is provided, by taking into account their differences both in terms of performed activities during assembly and of material exposure at the assembly workstations. The evaluation is carried out through the proposal of a mathematical model, to understand the impact on assembly time and on operators’ energy expenditure. The behavior of the model is investigated both with a parametric analysis and a real case study. The results show that the FW is the best one when the system is working at its maximum throughput, while the WW strategy turns out to be preferable for the lower values of market demand, both from a time and an energy expenditure perspective.

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A case study on implementation of walking worker assembly line to improve productivity and utilisation of resources in a heavy duty manufacturing industry

Cited by 11 publications

References 4 publications

Experimental studies of robotic assembly of precision parts

Experimental studies of robotic assembly of precision parts

Application of Single Minute Exchange of Die to Reduce Changeover Time in a Winding Machine of a Capacitor Line

Walking worker vs fixed worker assembly considering the impact of components exposure on assembly time and energy expenditure

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