Productivity Evaluation in Function of Worker Psychosocial Factors

Workers are exposed to different factors that can be detrimental to their well-being, being the most known safety and hygiene factors. A few years ago, the concepts of harmful factors for workers were updated by adding the psychosocial factors. Although there is literature on psychosocial factors and their effect on health, this work focused specifically on seeking the relationship between productivity and psychosocial factors to know how it impacts the organization. The investigation was applied in a case study for a doorknob locks manufacturing company in its final assembly area. Data collection was done by applying the questionnaire provided by NOM-035-STPS-2018 and the company's productivity databases for the subsequent analysis using statistical tools. The results were that, for the violence factor, its correlation with productivity was R2 = 0.8886, indicating a strong correlation with which it is concluded that there is an influence on productivity.

Lean Manufacturing: Efficiency improvement application in multi-product area of the Aerospace Industry

This research addresses the problem of leveling workloads in a multi-product final assembly area. In which it was found that 27.4% of the time is used for set up and the current distribution presents areas of opportunity. The target was to implement improvement actions to make use of resources more efficient in the production process in the aforementioned area through Lean Manufacturing tools. The results obtained consist of eight products generated with the support of lean manufacturing support tools such as SMED, Workload Balancing and MUDA waste identification, achieving important results among which productivity in the area stands out from 109% to 125%, as well as a reduction in set-up time from 17 min to 4.4 min.

Giluyskaya Hydropower – new approach to project development

Multivariate water-power calculations were carried out and the main parameters of the reservoired Gilyuyskaya HPP were justified. The Gilyuy river is located in the Amur Region of the Far Eastern Federal District and is a right tributary of the Zeya River. The mouth of the Gilyuy river is located above the power site of Zeyskaya HPP. Based on the water-power calculations, it was found that the most efficient way is to use live storage capacity of 3.13 km3 and the turbine flow rate of HPP equal to 268 m3/s. The installed power capacity of Giluyskaya HPP is justified on the basis of maximizing the net present value and is assumed to be 213 MW. Hydropower has three hydraulic units with radial-axial turbine RO115with impeller diameter of 3.35 m and synchronous speed of 214.3rpm.The high-head water power development includes as follows: a concrete gravity dam, a concrete spillway dam with nappe-shaped profile, a concrete power dam with three water inlets and three steel pipelines with a diameter of 4 m, as well as HPP building. The HPP building is 48.68 m long and consists of three hydropower units with a width of 16.23 m. The length of the tent of HPP building along the flowstream is 18.5 m. The assembly area is 24.34 m long.

Enhancement of Production Rate and Flexibility in an Assembly Line by Execution of Various Lean Techniques - A Case Study

This research work mainly focuses on the flexibility and productivity improvement through the execution of different lean techniques in the valve assembly of medium scale manufacturing unit. The different types of wastes percentage are determined to find out the waste which mainly affects the productivity. The major wastes of motion waste by about 30% and unwanted distance of 250 square foot were reduced by implementation of kaizen in the valve assembly area. Value stream mapping was used to identify the bottleneck process and by eliminating the bottleneck process results in the reduction of excess motion and non-value added activity by 45%. Work-in-process aging and work-in-process inventory cost was calculated and the production level was estimated by using 95th Percentile calculation. The total lead time was reduced about 54minutes with reduction of transportation time 2.7minutes after the implementation of lean techniques and the productivity of the valve assembly was also increased to about 6% after reducing the non-value added activities.

A Robotic Automatic Assembly System Based on Vision

At present, the production lines of mobile phones are mainly manual and semi-automatic. Robots are the most important tools used to improve the intelligence level of industry production. The design of an intelligent robotic assembly system is presented in this paper, which takes the assembly of screen components and shell components as examples. There are major factors restricting the application of robots, such as the calibration of diversified objects, the moving workpiece with incomplete information, and diverse assembly types. A method was proposed to solve these technological difficulties. The multi-module calibration method is used to transform the pose relationship between the robot, the conveyor belt, and the two cameras in the robot assembly system. Aiming at a workpiece moving with incomplete information, the minimum matrix method is proposed to detect the position. Then dynamic fetching is realized based on pose estimation of the moving workpiece. At last, the template matching method is used to identify the assembly area of the workpiece type. The proposed method was verified on a real platform with a LINKHOU LR4-R5 60 robot. Results showed that the assembly success rate was above 98%, and the intelligent assembly system of the robot can realize the assembly of mobile phone screens and back shells without any staff.

Model-based transmission acoustic analysis and improvement

A model-based transmission acoustic performance has been studied. Both excitation source and structure-borne noise transfer are investigated. For excitation source, transmission error is the main cause. To reduce transmission error, the most effective method is gear micro-geometry modification. However, there is no direct mathematical model that could reveal the relationship between transmission error and gear micro-geometry parameters, especially in the context of transmission system with shafts, bearings and housings included. By using multiple variable linear regression method, the relationship between transmission error and gear micro-geometry parameters is connected. The optimised transmission error decreases from 9.34 to 5.65 μm at a typical working condition. For structure-borne noise transfer, the housing modal and transmission system modal have been analysed. Based on the simulation results, housing thickness around bearing assembly area is increased, and strengthen ribs are added at weak areas. As a result, the amplitude of housing vibration acceleration is reduced. Finally, the transmission noise sound pressure level at 0.3-m distance has decreased by 4.63 dB on average. The presented model-based transmission acoustic analysis work flow is demonstrated workable and effective.

PRACTICE OF DIMENSIONAL IN THE IMPLEMENTATION OF THE METHODOLOGY OF GROUP INTERCHANGEABILITY

The subject of consideration in this article is the process of modeling the dimensional relationships at the Assembly stage using a single-circuit graph size scheme, which describes the mechanism of the individual parts of the conjugation in the implementation of the Assembly area group interchangeability methodology, reflecting the specific conditions of production. In the context of dimensional modeling, calculation procedures are considered on the basis of the developed mathematical model, which can be applied to both single-circuit and multi-circuit size schemes with dependent size chains. In particular, for the conditions of large-scale production, the algorithm for determining the scattering field of the assembled parts sizes by sorting them into size groups is considered. The design procedure is considered on the concrete example which describes a variant of completing of details with rather wide tolerances in the Assembly unit meeting the set criterion of working capacity.

AUTOMATION OF ASSEMBLY OPERATION BASED ON DUAL-ARM ROBOT

Urgency of the research. Automation as a whole, together with increasing of demands from customer push companies at all levels to the implementation of new and innovative solutions of robotic devices. This reason we consider as sufficient for realization of special customized solution for deployment at assembly operations. Target setting. Purpose of article is to give an example how to increase a level of automation based on specific requirements that consists from assembly area. Actual scientific researches and issues analysis. Actual research is nowadays focused at such problematics, because return of investments based on robotic devices seems to be reliable and people at workplace can realize and focus to another type of tasks. Uninvestigated parts of general matters defining. Specific automated solution based on dual arm robot implementation into the assembly process brings us a new possibility for assembly flow realization together with required assembly sequence for whole operation. The research objective. The aim of article is to provide an idea how to automate such manual assembly tasks with focus to robotic devices implementation. The statement of basic materials. For realization of automated solutions is good to have a suitable material how to solve assembly sequence and assembly process. Conclusions. Published article presents an innovative idea for dual arm robot implementation into the assembly process. Proposed assembly sequence based on human – robot cooperation at this specific workplace gives an example and view how automation of assembly processes can be solved.

Combining lean tools application in kaizen: a field study on the printing industry

Purpose The purpose of this paper is to highlight the lessons learned from two kaizen events for productivity improvement in a printing company. The paper suggests how to organize lean tools to improve productivity through the use of organized kaizen events in the printing industry to meet defined targets. Design/methodology/approach This paper is based on a field study involving participant observations. The relationships among the three specific tools, line balancing, standardized work and standardized layout that are used in a kaizen event of a printing factory, are examined. Findings Application of a mix of lean tools resulted in significant productivity improvements of 10-30 percent in the assembly area of the printing company. Based on the outcomes of the lean tools that are applied in various work areas, the best combinations of lean tools are identified and several key considerations are discussed. Practical implications This paper shows that a combined set of lean tools such as line balancing, standardized work and standardized layout can be applied to improve productivity in the printing operations, which is identifiable with a mix of processes that are both labor intensive and equipment flexible. Originality/value The paper fills the literature gap on the use of specific lean tools: line balancing, standardized work and standardized layout in the printing industry. The findings from this research can be applied to other assembly systems that are similar to the printing industry.