Rolling Machine Research Articles

Evolution of Mechanical Properties of an AA 6061 T6 Aluminum alloy Processed by Cold Working (CW)

Nano scale grain size reduction (UFG) is one of three suitable methods for improving the mechanical properties of 6000 series aluminum alloys, by structural precipitation, strain hardening or by cold work hardening. For the cold working, several techniques are now available such as (ECAP - PC), (CEEA), (THP), (MM), (ARB), (CW). Cold work by compression high pressing (CW-CHP) can be applied in several cycles depending on the hardening behavior of the material. The influence of the nonmetric size of the grains produced by the (CW-CHP) of a cylindrical rolling machine with four passes of Sever plastic deformation with reduction ratios of (3.5, 10,18.8 and 28%), on the mechanical behavior of the alloy 6061 T6, was analyzed by determining the ultimate tensile strength (Rm), yield strength (Rp0.2, the strain hardening capacity SHC (Rm-Rp0.2), the work hardening coefficient n', the modulus of 'work hardening K' . The increase in the rate of work hardening by the reduction of the sample sections and consequently the reduction of the grain size at the first and the second pass, improves the mechanical properties of the alloy to the maximum values, and then the presence of crack initiation participates to the moderate decrease of the mechanical properties.

RESEARCH OF THE CHANGE OF THE MOTION MODES OF THE WORKING ARRAY IN A TURNING MACHINE WITH AN ADDITIONAL MOVEABLE SLIDING LINK DEPENDING ON THE CHANGE OF DESIGN FEATURES

With the help of the SolidWorks automated design system, analytical studies of the rolling machine with complex spatial movement of the working capacity of the “Turbula” type, which contains an additional moving link of the slider in its kinematic chain, were performed. On the basis of the analytical studies, the relationship between the change in the modes of movement of the working array in the middle of the container, the value of the angular velocity of the drive shaft, the scale standard size and the ratio of the interaxial distance of the container to the interaxial distance of the forks was determined. The classification of the movement modes of the working massif is presented, in particular, which should include cascade, mixed and waterfall movement modes. Each movement mode corresponds to the implementation of the corresponding types of felting technological operations or mixing of loose fine-dispersed substances. The effect of changing the length of the working capacity, which is characterized by the ratio of the interaxial distance of the working capacity to the interaxial distance of the leading or driven forks of the machine, on the change in the modes of movement of the working array has been established. Mathematical dependencies have been obtained for determining the maximum angular velocity of the drive shaft of the “Turbula” type rolling machine with an additional movable slider link, which will correspond to the formation of the necessary mode of movement of the working array. The presented results of analytical studies can be applied in the relevant design bureaus of machine-building enterprises at the stage of designing equipment with complex spatial movement of working capacities and felting technological processes.

Concatenated DNA walking and rolling machines with programable interfacial tracks for kanamycin detection

Antibiotic residue has been emerged as serious threaten for food safety. In this work, we integrated enzyme-powered single-leg and multipedal DNA walkers and constructed concatenated DNA machine as signal amplifier for the sensitive detection of kanamycin. By integrating two kinds of motion pattern, the walking track particle not only guarantees the single-legged walking process, but also serves as multipedal walker to perform rolling process via interparticle relative motion. Through reasonable modulating the interface of track particle, the optimum enzyme reaction kinetics at interface was obtained, which enabling the effective synergism of walking and rolling machines. Under optimum condition, it was able to achieve a limit of detection as low as 62.5 fM for kanamycin by the concatenated DNA machines in 80 min. Furthermore, the proposed method exhibited good selectivity and the recoveries results of spiked milk and honey samples were in the range from 95.9% to 106.3%. This concatenated DNA Machine provides a promising strategy for sensitive detection of other food contaminants of interest.

Rancang Bangun Double Ring Infiltrometer Untuk Pengukuran Penambahan Ketinggian Campuran Sabut Kelapa Dan Pasir

In Indonesia, currently the problem of water infiltration into the ground has become a major problem in various areas, especially urban areas. One of these problems is influenced by changes in land use due to growth and increased population activity. In general, in Indonesia the transfer of land use from green open spaces to buildings. As a result of the lack of a good water absorption rate can cause many flood disasters. To prevent flooding, knowledge about the rate of water infiltration in an area is important. To measure the infiltration rate, infiltrometer technology is needed. The design of the double ring infiltrometer has 3 stages, namely first using 304 stainless steel material, the next stage is the rolling process using a 6 × 1300 mm BB613RL rolling machine, and the last stage is the welding process using TIG welding. The effect of adding a mixture of coconut coir and sand on changes in the infiltration rate that occurs in both rings, in this change the slowing of the infiltration rate does occur because the mixture of coconut coir and sand blocks water infiltration directly into the soil. Thus it can be concluded that the addition of a mixture of coconut coir and sand as a ground cover does not have much impact on the rate of water absorption into the soil, especially in the direction of water absorption perpendicular to the soil.

PENJADWALAN PROYEK PEMBUATAN ROLLING MACHINE MENGGUNAKAN METODE JALUR KRITIS

Scheduling is very important in the basis of project planning so that it can run smoothly and can be completed on time. Before the project is carried out, it is necessary to have a project management stage which includes the planning stage, the scheduling stage and the coordination of these stages. Estimation of completion time for the production of rolling machine projects scheduled by PT. X is 36 days, the actual time in working on the rolling machine project is 32 days, then the estimated time for completing the iron rolling machine project using Microsoft Project is 27 days. The sequence of work processes using the critical path starts with number 1.1-1.2-2.1-4.1-4.2-4.3-4.7-4.8-6.1-6.2-6.3-7.1-7.2-7.3-7.4-7.5-7.6-7.7-7.8-7.9-7.10-8.1-8.2.

Technological parameters of roller machines

The study is devoted to the determination of the technological parameters of roller squeezing machines; these parameters determine the efficiency of the process, product quality, and the environmental situation of production. A mathematical model for the distribution of hydraulic force in roller machines has been obtained. The formulas for calculating the removed and residual moisture of the processed material are determined. It was found that the value of residual moisture depends on the value of the angle where the moisture changes position.

The effect of roller pressure and feed rate on hides squeezing

The article presents the results of experimental studies of the process of extracting excess liquid from a water-saturated hide. The experiments were conducted in two options: using a rigid base plate and a cermet base plate for the feed mechanism of the roller machine. In the study, samples of a wet hide on rigid and cermet base plates were pulled between rotating squeezing rollers using conveyor chains. Mathematical dependences of the amount of liquid removed from a wet hide on its feed rate and the pressure of the squeezing rollers were obtained for two special options. The experimental results showed a significant increase in the efficiency of the squeezing process of a wet hide due to the use of a cermet base plate in comparison with a rigid base plate.

Force parameters of roller machines

To facilitate the force analysis of the roller machine under consideration, the previously obtained model of the pattern of distribution of normal contact forces is approximated by an empirical dependence. The moduli of the main vector of elementary normal and tangential forces of each roll, the main moments of elementary forces relative to the axis of each roll are determined. It is revealed that the qualitative distribution pattern of normal contact forces gives the magnitude of forces and moments, expressed through the maximum of the normal force.

Process research of grind enriched groats products in the roller machine of the 2nd grinding system of milling of high-grade flour

Process research of grind enriched groats products in the roller machine of the 2nd grinding system of milling of high-grade flour

Selecting the operating mode of roller machines

A dependence of the distance between the rolls on the radis of the roll, the thickness of the processed material, and the coefficient (angle) of friction of the processed material on the surface of the roll coating were theoretically studied. An experimental study revealed the dependence of the distance between the rolls on the intensity of the load, the radius of the roll, and the thickness of the material being processed. It was found that with an increase in the roll radius and load intensity, and with a decrease in the thickness of the material being processed, the distance between the rolls decreases.

Исследование упругопластического изгиба листовой заготовки различной толщины при ее вальцевании

The work analyzes the process of rolling the sheet blank to obtain a cylindrical shell of large diameter. The analysis is carried out on the basis of strength calculations of elastoplastic bending of the sheet billet taking into account the springing effect. Springing calculation is carried out on the basis of available ratios of energy of plastic and elastic deformations formed in the material of the sheet blank. Conclusions are drawn and practical recommendations are given, which can be used in the process of adjustment of process parameters of rolling machines.

Pengadaan Alat Produksi Guna Meningkatkan Produksi DUPITOS di Dusun Petung Sewu Kabupaten Malang

Abstract
 Dusun Petungsewu is one of the hamlets producing quality corn gerit. The product diversification that has been carried out is in the form of tortilla chips, which are named Dupitos (Duwet Polinema Tortilla Chips). The production is carried out by the people of Dusun Petungsewu. The potential possessed by Dusun Petungsewu by processing Dupitos is quite large. This is because Dupitos products are healthy snacks that are suitable for consumption by all ages. Currently, Dupitos' production process still uses inadequate equipment. Therefore, this service aims to donate the equipment needed in the Dupitos production process so that the production process can run smoothly. The implementation of community service programs is carried out in the form of production equipment grants, knowledge transfer, questions and answers and evaluations. The results of the service show that the procurement of production equipment in the form of a dough rolling machine and dough thinning machine facilitates the Dupitos production process. Thus, partners can work more efficiently and effectively. This service provides several benefits both in terms of quality and quantity. It is hoped that the implementation of the service can provide benefits and help both partners to improve the quality and quantity of production.
 Keywords: Dupitos, Dusun Petungsewu, equipment assistance

DETERMINATION OF THE RELATIONSHIP BETWEEN THE CHANGE OF THE MOTION MODES OF THE WORKING ARRAY AND THE DESIGN FEATURES OF THE “TURBULA” TYPE TURNING MACHINE

Using the SolidWorks automated design system, analytical studies of the “Turbula” type rolling machine with an additional movable rocker link with a vertical axis of rotation were carried out for the possibility of determining the dependence between the change in the movement modes of the working array and the design features of this rolling machine. It is noted that the movement of the working array in the filling tanks with different types of movement can be carried out in cascade, waterfall, mixed, as well as closed modes of movement. During the implementation of each mode of movement of the working array, conditions are created for the performance of appropriate felting technological operations or mixing of loose fine-dispersed substances. It was established that the change in the modes of movement of the working array in the rolling container performing complex spatial movement depends on three factors – the large-scale standard size of the rolling machine, the angular velocity of the drive shaft and the ratio of the interaxial distance of the container to the interaxial distance of the forks, which is characterized by the coefficient λ, the relationship is established the relationship between these factors. Mathematical dependencies have been obtained to determine the maximum angular speed of the drive shaft of the “Turbula” type rolling machine with an additional movable rocker link with a vertical axis of rotation, which will correspond to the implementation of the necessary mode of movement of the working array, when it moves in a given capacity. The obtained results of analytical studies can be used in the relevant design bureaus of machine-building enterprises at the stage of designing rolling equipment with complex spatial movement of working capacities.

Theoretical and numerical investigation of micro-textures fabrication by ultrasonic surface rolling process

Surface texturing is a potential approach to achieving excellent surface performance. To realize high precision and efficiency in micro-texturing fabrication, a surface texturing method utilizing an ultrasonic surface rolling process is proposed. Firstly, the feasibility and geometric controllability of micro-texture preparation using ultrasonic surface rolling process are analyzed. Then, a contact theory model of ultrasonic rolling texturing process is established, which can describe the geometric relationship of the micro-texturing generation region. Based on the elastic–plastic theory, simulations of single-pass and multi-pass ultrasonic rolling texturing processes are developed to elucidate the formation and strengthening mechanism of micro-textures, and further characterize the effects of ultrasonic rolling machining parameters on micro-textures. A series of validation tests of ultrasonic rolling texturing are implemented on AISI 5140 steel. Simulation and experimental results show that the ultrasonic surface rolling process can fabricate micro-groove arrays with the periodic distribution. The validity of the theoretical and finite element models is confirmed by the comparison results. It is demonstrated that the ultrasonic rolling texturing process is a feasible and efficient way to fabricate controllable micro-textures.

Design of Roll Sheet Metal Forming Machine with Material Thickness of 0.3 mm

The role of wood as a choice of roof frames for houses is increasingly being abandoned due to high costs, wood materials are easily exposed to flying termites so that they corrode. aluminum, and zinc. So, it is more resistant to corrosion and made according to ISO standards, mild steel sheet material / metal sheet for roof truss construction is formed by profiles where the process of forming these profiles is by cold rolling, known commonly as a metal forming process or cold metal forming with external force emphasis. on the plastic condition of the steel sheet, due to the high market demand which is promising now efforts to build a light steel profile factory are springing up rapidly. The prospect of the metal forming process industry still has a good chance, therefore the initiative was taken to design a metal roll forming machine with a straight triangular groove profile with galvalume steel sheet material with a thickness of 0.3 mm and used for practical purposes in the production process. The metal forming process is a work process. metal by changing the shape of the workpiece by applying an external force so that plastic deformation occurs and the resulting mild steel profile is generally intended to be carried out at room temperature without heating the steel sheet. The design of the roll machine along with the frame to be constructed has dimensions of 200x400x275 mm and a frame of 310x400x750 mm, with the rotary wheel of the roll machine.

Capability-based remaining useful life prediction of machining tools considering non-geometry and tolerancing features with a hybrid model

ABSTRACT Machining tools are vital components of intelligent manufacturing systems whose state and remaining useful life (RUL) determine product quality. Specifically, the wearing of tool reduces its capability of production yield and diminishes product quality. Therefore, a capability-based RUL prediction approach is proposed in this paper to thoroughly evaluate the state and RUL of machining tools. First, the connotation of tool capability is discussed, and a framework for quality assurance capability-based RUL prediction is proposed. Product quality, which can be used to assess the capability of tool, is modelled and expanded to consider non-geometric dimensioning and tolerancing (non-GD&T) features based on the classic geometric dimensioning and tolerancing (GD&T) system. Second, a physics-based model of process is developed to estimate the non-GD&T features and calculate tool wear. Third, a hybrid data-driven and physics-based model is developed to quantitatively assess the capability of tool based on the comprehensive quality estimation. Finally, a case study of rolling machining tool is carried out to verify the effectiveness and proactiveness of the proposed framework, and the final result highlights its rationality and accuracy in estimating the RUL of machining tools with better interpretation.

Bending of sheets and profiles on a four-roll machine for rocket bodies, tubular and frame products. Part 10

The theory of stamping is developed taking into account the anisotropy and hardening of the workpiece. The calculation of the parameters of the deformed-stressed state of the billet is carried out using the example of bending on a roller machine or in a die. Deformations, stresses and forces acting on the billet from rolls or die tools are studied by CAD/CAE modeling. The criteria for crack formation, low accuracy and excessive springback of the part after processing are determined, recommendations for their elimination are given. Keywords: stamping, anisotropy, billet, bending, roll machine, die, CAD/CAE modeling. dr_zharkov_v_a@mail.ru

A Novel Heat-Assisted Three-Roll Incremental Rolling System for Flexible Rolling

Abstract The increasing demand for customized products and rapid prototyping triggers the development of dieless forming process where the need of part-specific dies is eliminated compared to conventional forming processes. This paper presents a heat-assisted three-roll incremental rolling system capable of producing rods and tubes of various diameters without the need for die/tool replacement. The system incorporates two possible heating mechanisms, namely, an induction heater and a high-current power supply for electrically assisted forming. Due to its high flexibility and hot forming ability, this rolling system is ideal for low volume production or scientific research. The newly fabricated rolling machine was initially evaluated using low carbon steel rods. The experiments have shown that the machine can produce metallic rods down to 6 mm in diameter without apparent spiral marks on the outer surface of the rolled product using multiple passes. The finite element method (FEM) was used to analyze the reaction moment, depth of the spiral marks, and the effect of axial feeding speed on the spiral marks. The simulation model predicted the results of the experiments with less than a 10% error. The work established a flexible rolling platform for possible future research, which can include the study of interface behavior in the thermo-mechanical rolling processes, and the study of material behavior in this multi-axial multi-physics environment.

Research on cross wedge rolling forming technology of railway axles

This paper introduces a new forming method of railway axles: the square bloom is forged into a round axle billet by fast forging machine, then the round billet is rolled into the rough axle by the cross-wedge rolling machine. In order to prove the feasibility of this method, we have done an experimental trial of the technology on making scale-down Chinese railway freight axles with the scale ratio 1:1.4. The test result shows that the new method can double the productivity compared with the single forging method, save about 9% materials and improve shape accuracy of rough axle. Microstructure and mechanical properties of the axles formed by the new method have been tested and the test results show that the yield strength is greater than 345Mpa, the tensile strength is greater than 610Mpa, and the grain size reaches grade 8, which meets the standard requirements; The transverse and longitudinal impact toughness is greater than 21J, and the cross-sectional hardness distribution is uniform; The fatigue toughness test shows that the KQ value of the journal and shaft body in the deformation area of cross wedge rolling is slightly larger than that of the wheel seat, which indicates that the CWR process has no negative effect on fracture toughness of axles.

Numerical Simulation of Copper-Aluminum Composite Plate Casting and Rolling Process and Composite Mechanism.

This paper uses ANSYS Workbench platform to simulate the casting and rolling composite process, taking the horizontal type casting and rolling machine as the research object, and conducts the numerical simulation study of copper-aluminum composite solid-liquid casting and rolling heat-flow coupling, mainly to study different walking speed, aluminum pouring temperature, casting and rolling zone length, heat transfer coefficient on the temperature field, liquid phase rate influence law, and use it as a theoretical guide for copper-aluminum solid-liquid casting. The experiments of copper-aluminum solid-liquid casting-rolling composite were carried out to optimize the process parameters and to verify the experiments, so as to prepare a well-bonded copper-aluminum composite plate. The composite mechanism in the preparation of copper-aluminum composite plate was analyzed, and it was clarified that the interfacial layer was formed through four stages: contact between copper and aluminum surfaces, contact surface activation, mutual diffusion of copper and aluminum atoms, and reaction diffusion.