Classification of crankshaft remanufacturing using Mahalanobis-Taguchi system

Abstract

Remanufacturing is a process of returning a used product to at least its original performance with a warranty that is equivalent or better than that of a newly manufactured product. During a preliminary inspection on remanufacturing companies, it was found that there is no end life for crankshafts in terms of classifying it either to remanufacture, repair or reject due to limited information provided by the original equipment manufacturer. The manufacturer did not provide any information on the annual quantity produced and their specifications to the remanufacturing company for the purpose of referencing. Eventually, the distinctiveness of the remanufactured crankshaft from the original cannot be measured. Thus, the aim of this work is to classify crankshafts' end life into recovery operations based on the Mahalanobis-Taguchi System. The crankpin diameter of six engine models were measured in order to develop a scale that represents their population in a scatter diagram. It was found that on the diagram of each engine model, the left distributions from the center point belong to rejected crankshafts, the right distributions belong to re-manufacturable crankshafts, and the upper distributions belong to the repairable crankshafts. The developed scale is believed to be able to help remanufacturers instantaneously identify and match any unknown model crankshafts to its right category. The Ministry of International Trade & Industry (MITI) has established a remanufacturing policy under RMK11 and put in efforts to encourage Malaysians to venture into the remanufacturing business. Thus, this model will help the industry to understand and formulate their decision-making to sustain the end of life of their products.

Characterisation of activity based costing on remanufacturing crankshaft

“…This work is actually a continuation of the research done by Abu et al [23] of a classified EOL crankshaft into rejected, repairable and remanufacturable. Generally, the ABC system includes allocation of indirect costs to centres, costs from centres to activities and costs from activities to cost objects.…”

“…Similarly, Shigaev [22] applied the ABC approach to give a better insight in the actual cost structure of a positron emission tomography procedure by defining the constituting components and simulating the impact of possible resource or practice changes. In the case of gall bladder surgeries, ABC approach is proven to be an effective cost management model that determined costs and evaluated financial performance across departments [23]. In a work by Jusoh and Miryazdi [24], the authors described the case of the realisation of a two-stage cost allocation scheme of ABC and related customer profitability report at a distribution company.…”

Evaluation of eco-design strategies for development of multiple life-cycle products

“…There are several automotive components that have potential for multiple life-cycles, such as clutches, brake shoes, engine block, starters, alternators, water pumps and carburettors [37,69]. Besides that, the remanufacturing of automotive products is an effective strategy to promote sustainability in the automotive industry because, compared to new products, remanufactured products only cost 50% of the cost for new products, utilise 60% of energy and 70% [70], Therefore, an engine was used as a case example in this study. As there are too many design requirements and some of the requirements are conflicting [56], the design requirements have been analysed from a review of 25 publications as shown in Table 3.…”

Application of the Mahalanobis-Taguchi System in Renal Profile of the Methadone Flexi Dispensing Program

“…Abu et al [29] provided a systematic pattern recognition using MTS by constructing a scatter diagram that could support decision making of a particular industry on 14 prominent journals of crankshaft belonging to 7 engine models with differrent numbers of samples. Abu et al [30] classified crankshafts' end life into recovery operations based on the Mahalanobis-Taguchi system. Nik Mohd Kamil and Abu [31] developed a distinctive pattern of the crankshaft and identified crankshaft's critical and non-critical parameters based on the MTS, then applied the Activity Based Costing (ABC) as a method of estimation for the remanufacturing cost of the crankshaft.…”