The following article describes the logistics analysis on one of the commonly detected problems in trains, associated with BINPACKING, as it is, the wagon's load, by transporting precious materials extracted from the mines in the state of Chihuahua, as they are: gold ingots, silver ounces and precious gemstones, it has also analyzed the supplies transportation for subterranean mining in the state, which results complicated when optimizing space for good arrangement, to be able to take advantage of the total cargo capacity and the time this process takes. The main goal was utilizing an algorithm for the optimization of the cargo and the materials arrangement to transport them from the city of Chihuahua to Los Mochis, Sinaloa. The freight train line to utilize is FERROMEX, one of the most representative in the country. It's important to consider the client's requirements and the wagon's capacity to assure the supplying of this materials effectively. We utilized data that allowed doing simulations in the MATLAB software by VRP (Vehicle Routing Problem) to optimize the routes they will follow for the materials and supplies transportation to afterwards realize the load in the FERROMEX's train wagons.
Mineral commercialization allows us to define the supply and demand of mining products in a plane of time, in function of the calculus of the type and quantity of mineral products the different industry actors will produce and consume in the future, satisfying the client’s, actionists’, provider’s and society’s needs to contribute to the country’s development. The freight train is considered as the best option to transport minerals given their main advantages attributed to low cost, low energy consumption and it avoids traffic, above all. For instance, logistics has more importance for the organizations because consumers demand greater quality, the growth level and economic stability depends on an excellent merchandise distribution.
In the present investigation it is presented an option for train transportation of the enterprise FERROMEX, of materials extracted from different mines in the state of Chihuahua specially: Santa Bárbara, El Oro and Parral joined to the mining machinery utilized in subterranean mines; applying VRP for the transport routes optimization, by the MATLAB software.
In Mexico there are many markets and corridors of loading
largevolume where the rail transport services of load are bear the
"heavy burden" of land transport. Thus contribute to promote
national economic development by giving the producers,
importers and exporters access to transport services of great
capacity for a likely cost lower than for roadway transport. The
prospects generated in terms of development make the
performance of the industry of rail transport of loads a matter of
public interest in Mexico, as in many other countries. The rail
service was a fundamental element in the process of
industrialization of Mexico. The expansion and deregulation of
other means of transport generated to decline in its activity. Faced
with the need to compete in the global market with efficient
transport and economic, in the mid-nineties Mexico concessions
rail services to companies in the private sector. This same
situation is lived in other countries, mainly in Europe and Latin
America. The granting of the rail service had as an objective to
create more infrastructure, modernize the structure internal trade,
count with efficient transport and economic, encourage
competitiveness in the economy and provide benefits in terms of
mobility. To realize the concessions had to modify the
Constitutional Article 28, by changing to the railways the
recognition of strategic area by the priority area for national
development, and consequently created the Regulatory Law of rail
service. It should be noted that this measure, which is necessary
for the momentum of the railways as a means of transport
intervener of economic development, had not had the necessary
support in the law which has no measures to ensure in its entirety
the objectives [
Ternium is a steel producer company leader in the Latin American
market. Account with integrated processes for the manufacture of
steel and derivatives, with the highest technology. Is the largest
manufacturer of finished steel products in Latin America. Caters
to customers from a variety of industries such as automotive,
construction, metalworking, white line, packaging, energy and
transport. Ternium and its subsidiaries have 16 production centers
in Argentina, Colombia, United States, Guatemala and Mexico
[8]. It also integrates the control group of Usiminas jointly with
Nippon Steel & Sumitomo Metal Corporation (NSSMC) and
housing of employees of Usiminas. With a solid position,
provides high complexity steels to major markets in the region.
Ternium develops through strong steels productive integration. Its
plants cover the entire process of manufacture, from the mining of
iron ore to the manufacture of high value added products, and
promotes the development of the companies of the metal
mechanic sector. The production capacity of Ternium is 10.8
million tonnes of finished steel per year [8]. The rolls of
hotrolled steel are inputs for the manufacture of intermediate and
capital goods, for example: automotive parts, profiles, structures,
pressure vessels and piping, among others. Additionally, the own
steel industry uses the hot foil as an input to produce foil cold
rolled over [
To optimize the arrangement of the rolls coated in wagons for your transportation, is a clear problem of distribution of objects in wagons (bin packing). Classic problem of combinatorial optimization NP-hard, in which there is a sequence of n objects L= {a1, a2…….an} with a given size 0 < S(a1)≤C and a limited number of containers ,each of capacity C. The objective is to determine the number of containers in which all objects can be distributed, the expression expresses this problem, given [10]: N= number of objects to distribute, in where C= Capacity of the platform I=sequence of n objects to1 S1 ( A1)= size of each object ai Find a minimum partition of L minimum , L= B1 or B2 u. U BM Such that in each set bj the sum of the size of each object s(ai ) In Bj , does not exceed c. To make the arrangement of the rolls of steel is used a genetic algorithm that will be run on the Matlab software to generate the solution of a better optimization of the spaces in the platform. Table 2 shows the pseudocode to use [10]. 5 Select individuals to cross in proportion to their aptitude. 6 Apply Crossing_BFD and generate new individuals. 7 Substitute the worst individuals for the new individuals. 8 Apply Mutation_RV to the worst individuals. 9 If generation > gen1 10 Clone the best individuals of the population 11 Apply Mutation_RpP to the cloned individuals 12 Substitute the worst individuals for the cloned individuals 13 End if 14 Apply Delete_by_Substitution to the repeated individuals 15 If generation > gen2 16 Select the best individuals to cross 17 Apply Crossing_RpP to generate new_individuals 18 Substitute the worst individuals for the new_individuals 19 End if 20 Register the best_solution 21 End while 22 End procedure
To do this although there are a number of definitions of products
made of steel or other metals that can be presented in the form of
rolls of better known as steel coils, and defined in the UNE- EN
10.079:1992'[
Once taking the best form of accommodation will take the times,
the possibility to optimize the times of loading and unloading. To
do this use the orthogonal arrangements are designs proposed by
Taguchi which, as its name indicates, have the property of
orthogonality, same that also possess the factorial designs classics.
These arrangements are fractionated factorial designs complete, or
mixed, depending on the number of factors to consider in a
particular case [
As mentioned, through the usage of MATLAB run the genetic algorithm in order to accommodate the rolls of steel in the best way possible by minimizing the spaces in the railway platform. In table 5 the measures to use of the rolls. To run once every type of roll in software, with the selected instances to observe its behavior. To perform the experiment was implemented a genetic algorithm, with a capacity of population of 500 and 5000 generations. In Figure 4 shows part of the algorithm to use to insert the selected instances of the rolls.
Using the orthogonal design of Taguchi aims to obtain the most significant factors with respect to the time of loading and unloading. For the experiment were used 3 controllable factors which are the types of machine to uses either crane of clamps and crane hook type c, weight of the steel coils, work shifts and 2 noncontrollable factors, is the distance travelled and the operators involved in the load. In this way should be carried out 8 runs with the goal of finding the shortest possible time of all the bullfights.
As mentioned in the literature, tests were carried out in the Matlab software to display the possible accommodations in the platform, for your transportation. In the event, through the modification and the use of a genetic algorithm, it was decided to find a possible solution to the problem of Bin Packing for this two types are used two instances to the rolls of steel. In the bullfight 1 (Figure 6 A) instances used were of 1.9 m long and 1.2 wide. The second bullfights (Figure 6 B) is 2 m long by 1.5 m wide. Both with a population of 100. As mentioned in the previous figure, in the first run is obtained 40 boxes, that by multiplying the weight in tons exceeds the permitted weight. In the second run is visualized 30 boxes generated by the use of the algorithm. When performing the bullfights Minitab for the design of the experiment were gets some graphs called noise signal. These tables identify the most significant value that you want to find. In that case to the problem, the most significant values are the shifts and the machines (cranes) specified in figure 7. Through the use of the orthogonal design was analyzed the estimation of the contribution of the individual factors that influence the load - download the rolls of steel. Making a connection with the figure 6 of the graphics, you can confirm which are the most significant factors for the load delos steel coils, mentioned above. The following table and displays the Taguchi analysis performed in the Minitab.
According to the results obtained for the time of accommodation in the transport must be performed to accommodate the time of unloading in the following design. On the basis of the results obtained in the experiment, the bullfights, it was found that the average is 4.0625, this means that you have to improve in the management of the use of the cranes. Other factors that affect is the turn as well as the use of cranes, an implementation in order to resolve this problem is the use of cranes. As can be seen to hold this type of materials is necessary to use mooring direct and indirect. The mooring indirect secure ground, it gives resistance to lateral and longitudinal movement of the rolls. While the direct ties anchored the rolls of steel. To perform this process, it is necessary to count with the mooring straps, cables or chains, taking into account the voltage of these materials.
After performing the bullfights, it was noted that the software we generated a greater number of boxes, due to the fact that only took the measures of the rolls, but taking another variable to improve this process would be the weight, what is needed to make further modifications to the genetic algorithm. Through the use of the orthogonal design was analyzed the estimation of the contribution of the individual factors that influence the loading - Unloading the rolls of steel. These times could be improved with the use of more cranes but this would result in higher costs to the company due to the shift and more operators, as well as earn the best condition for a process, so that the characteristics in a good quality can be sustained. For future work with respect to the design of experiments you can find more factors and make a greater amount of runs with the aim of improving this procedure. Also can implementing a VRP to perform the possible stops that could be along the route that goes from City of Monterrey to the city of Puebla. For transport requires the use of non-slip elements between the rolls of steel and the support, since it is considered to be essential in the transport of these products. The steel coils of mooring and subject will be duly approved and be ruled out in the event of breakage, wear or deformation of the same. As mentioned it is essential to make use of the standards set by the government agencies for its better transportation.
The realization of the drafting of this research article was possible thanks to the support of the Advisors Dr. Alberto Ochoa of the UACJ and Dr. Alberto Hernandez of the UAEM. [7] Referencia web:http:// www.ferromex.mx [8] Referencia web. Termium, http://ternium.com/about-us/ [9] Rincon Velandia, A., Rodríguez Casas, C. A., Castro Rincón, C. A., Zarate, J. H., & Buitrago, O. A. (2013). Estudio de supply chain management y logistica en la empresa Acerías Paz Del Rió SA. [10] VALENCIA, E. (1997, August). Optimización mediante algoritmos genéticos. InAnales del Instituto de Ingenieros de Chile (Vol. 109, No. 2, pp. 83-92). [12] Wu, Y., & Wu, A. (1997). Diseño robusto utilizando los métodos Taguchi. Ediciones Díaz de Santos.