MULTIOPERATIONAL ELECTROMAGNETIC FORMING MACHINE
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1 MULTIOPERATIONAL ELECTROMAGNETIC FORMING MACHINE Abhishek Rane 1, Ghanshyam Pendurkar 2, Tejas Phage 3, Aniket natalkar 4, Ganesh Pednekar 5 1 Professor, SSPM s college of engineering, Kanakavli, Maharashtra, India 2 Student, SSPM s College of Engineering, Kankavli, Maharashtra, India 3 Student, SSPM s College of Engineering, Kankavli, Maharashtra, India 4 Student, SSPM s College of Engineering, Kankavli, Maharashtra, India 5 Student, SSPM s College of Engineering, Kankavli, Maharashtra, India ABSTRACT The purpose of this project is to design and fabricate the economic machine for small sized sheet metal products. Conventionally for production of these products large machines are used which are not cost economical. Also there is a loss of energy due to friction. The objective of this project is to reduce the energy consumption, cost and to perform the various forming operations on a single machine. The solution is obtained with the implementation of Electromagnet. Since the actuation is electrically assisted the operation is frictionless and accurate. The punching force is controlled by varying current using DIMMER circuit. The power is consumed only during the punching stroke resulting into efficient operation. After successful fabrication, the set up was tested and optical testing is done for any defects in the punched samples. Keywords: Sheet Metal, Friction, Energy, Forming, Electromagnet, Punching, DIMMER, Optical testing 1. INTRODUCTION Sheet metal industry is one of the vast and rapidly growing industries. The intense researches are going on to develop more efficient and economical machines to carry out sheet metal forming operations. Conventionally, the machines used are mechanical press, hydraulic press, pneumatic press etc. These machines are often large in construction as compared to the product to be manufactured. Also there is a loss of energy due to friction. To overcome the disadvantages of conventional machine we implemented new concept based on Electromagnetism. With help of electromagnet the punch plate is made to move for punching operation. Various operations like punching, embossing, notching, slitting, perforating, bending can be performed on thin sheets of metal sheet, card board, asbestos, paper, foam, plastic etc. The required force for any operation can be obtained by controlling the power. We provide the DIMER circuit for controlling the power. The capacity of machine depends upon the size and the number of coils of an electromagnet. 2. PRINCIPLE OF ELECTROMAGNET Faraday s law of induction is a basic law of electromagnetism. It is the fundamental operating principle of transformers, inductors, electric motors, generators and solenoids. Electromagnetism is the production of magnetic field by current in a conductor. When current passes through coil windings, an electromagnetic field is created around the coil [1]. An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. A simple electromagnet consisting of a coil insulated wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field. The strength of magnetic field generated is proportional to the amount of current through the winding [2]. Solenoid is one of the applications of an electromagnet. When an electric current is passed through the coil windings, it behaves like an electromagnet and the plunger which is located inside the coil is attracted towards the center of the coil by magnetic flux setup within the coils body, which in turn compresses a small spring attached to one end of plunger. The force produced by electromagnetic attraction is transmitted to the punching tool by means of push rod. When the Volume 5, Issue 4, April 2017 Page 13
2 supply of current is turned OFF the electromagnetic field generated previously by the coil collapses and energy stored in compressed spring forces the plunger back to its original rest position [1]. 3. DESIGN METHODOLOGY 3.1 CAD Modeling Figure 1 Construction of Solenoid [1] The CAD model of existing machine is created. We studied the each part of the machine and understood the importance of those parts. After analyzing, we determined to eliminate the unnecessary parts to reduce the cost of the machine. The existing model is shown in figure 2. Our aim is to fabricate the machine with lowest possible cost. To achieve the target we eliminate some of the unnecessary parts. Instead of using two electromagnets we used only one. To maintain the desired force with one electromagnet we increase the gauge of wire and no. of turns. The four push rods are replaced by only one push rod at the center of punch plate. This also eliminates the magnetic plate. Also the four bolts and tapping operation on push rods are saved. With this new model about 25% of total cost is saved which is economic. The modified design is shown in figure Analysis Figure 2 CAD model of existing machine Figure 3 Modified Design Model We have done the static analysis to determine the optimum size of the frame. According to analysis point of view the most important part of machine is punch plate. The punch plate is analyzed for allowable static deflection and maximum stress for different sizes. The designed load is kept 1000N. Figure 4 Deflection Figure 5 Stress Volume 5, Issue 4, April 2017 Page 14
3 After too much iteration we selected the 200x200, 3mm thickness plate. The deflection and stress observed were mm and N/mm 2. Thus design is safe. 3.3 Design of Electromagnet Here we used the solenoid type electromagnet. The electromagnetic force generated should be greater than the force required to cut the material used. Calculation of required force Length of cut L= 25mm (assumed) Sheet thickness t= 0.3mm σ t for aluminum= 110 N/mm 2 Cutting force= 0.7*L*t*σ t = 0.7*25*0.3*110= 577.5N Press force= 577.5N Force produced (1) Where B=Magnetic flux= (2) A= Area of magnetic core μ= Permeability of air N= No. of turns L= Length of core I= Current Assume, I=60 Amp L= 71mm μ= 4π*10-7 H/m A=1075mm 2 Now, N= Specifications of designed electromagnet: 1. No. of turns= Wire gauge= Core area= 1075mm 2 4. Length of core= 71mm 4. RELATION OF ELECTROMAGNETIC FORCE WITH CURRENT The relation between the electromagnetic force and the current flowing through the coil is given by the equations (1) and (2). From the above equations it can be seen that the Force (F) is directly proportional to the square of the current (I). Also the force is directly proportional to the square of no. of turns (N) and inversely proportional to the length of electromagnet. These parameters can be used for obtaining the required force for punching. By using these relations we calculated the current required for punching various materials. Sample calculation for aluminium sheet Length of cut L= 25mm (assumed) σ for rubber= 26 N/mm 2 Cutting force= L*t*σ= 25*0.1*26= 65N From eq. (1) Force produced F= Sheet thickness t= 0.1mm B= Wb/m 2 From eq. (2) Magnetic flux B= Volume 5, Issue 4, April 2017 Page 15
4 I= Amp 4.2 Values of current for different materials Table 1: For Aluminium sheet (Shear strength= 180N/mm 2 ) Length of cut Sheet thickness Cutting force Value of current Table 2: For Plastic sheet (Shear strength= 90N/mm 2 ) Length of cut Sheet thickness Cutting force Value of current Table 3: For Rubber sheet (Shear strength= 26N/mm 2 ) Length of cut Sheet thickness Cutting force Value of current The graphical representation of Force V/s Current curve is shown below. Force (F) Force V/s Current 0 Current(I) Graph 1: Force V/s Current Using the above relation we can control the force by controlling the current for different operations. Hence better control on punch force and punch speed is achieved resulting in efficient operation. 5. EXPERIMENTAL SETUP In the setup, an electromagnet is fixed on plywood sheet to insulate from the frame. The soft iron core i.e. armature of electromagnet is attached to the punch plate at one end and another end is attached with the tool holder. The punch tool is held by the tool holder. The helical compression springs are used for retracting the punch plate after punching is done. The arrangement is done for die to fix on wooden block below the punch tool. The work piece is placed between the punch and die. The electromagnet is connected to 230V A.C. supply in series with the switch, DIMMER and ammeter. The dimmer is used to control the input current for electromagnet by simply changing the resistance to the current. For measuring the value of current we used ammeter. When supply is given to the electromagnet, the armature is pulled inside the core of electromagnet. This result into downward motion of both punch plate and tool and punching operation is performed on work piece. The current is changed according to the operation by using the dimmer. Volume 5, Issue 4, April 2017 Page 16
5 5.1 Comparison of electricity consumption Figure 6 Arrangement for testing The project model was compared with the mechanical press and hydraulic press for electricity consumption. All the three machines were run for an hour one by one and the units consumed by each machines were observed and tabulated for comparison. It has been observed that for same application, the electricity consumed by our machine was less as compared to that of other machines. Machine Table 4: Comparison of power consumption Duration of operation (hrs.) Units consumed (kwh) Mechanical press Hydraulic press Electromagnetic press RESULTS 6.1 Percentage reduction in electricity consumption 1. Compared with mechanical press: % reduction 2. Compared with Hydraulic press: % reduction 6.2 Reduction in total cost Sr. No. Parts used Material Quantity Cost in Rs. 1 Spring Patented and cold drawn steel Electromagnet Std Punch plate and electromagnet mounting plate EN L shaped channels M.S Volume 5, Issue 4, April 2017 Page 17
6 5 Rod M.S Punch tools and die HCHCr Metal strip 12x3mm M.S Plywood 15mm thick Wood Plywood 4mm thick Wood Electrical components Std Nuts, Bolts and Accessories Std Fabrication expenses Total 6470 The reduction in cost of the machine is achieved so it can be used for small scale industry economically. 6.3 Final product produced Figure 7 Washers 7. CONCLUSION By implementing this new concept in sheet metal operation, we concluded that the machine is economical for small scale industry. It is very flexible process in which the capacity of machine can be changed by changing the electromagnet only. The power consumption is less as compared to conventional machine for same size of the product resulting into efficient operation. By changing the value of current supplied the force generated can be varied according to the operation. Due to increased punch speed the quality of the product is improved. From the above conclusions the overall cost of the product can be reduced. References [1] AMAE Int. J. on Manufacturing and Material Science, Vol. 01, No. 02, November 2011 [2] [3] International Engineering Research Journal (IERJ), Volume 2 Issue 7 Page , 2017 ISSN [4] International Journal of Modern Trends in Engineering and Research (IJMTER) Volume 2, Issue, [July ] Special Issue of ICRTET 2015 [5] IJARIIE-ISSN(O) Vol-2 Issue [6] AMAE Int. J. on Manufacturing and Material Science, Vol. 01, No. 02, November 2011 Volume 5, Issue 4, April 2017 Page 18
7 [7] International Journal on Recent and Innovation Trends in Computing and Communication Volume: 4 Issue: 4 ISSN: [8] (ISSN , ISO 9001:2008 Certified Journal, Volume 5, Issue 4, April 2015) [9] (IJMER ISSN: Vol. 5, Iss. 7, July 2015, 30) [10] International Journal of Modern Trends in Engineering and Research (IJMTER) Volume 2, Issue, [July ] Special Issue of ICRTET 2015 [11] International Journal of Engineering Technology Science and Research IJETSR ISSN Volume 2 Issue 2 February 2015 AUTHOR Abhishek Rane received the B.E. degree in Automobile Engineering from Rajendra Mane College of Engineering and Technology in He completed the M.E. in Machine Design-Mechanical from FAMT, Ratnagiri in Volume 5, Issue 4, April 2017 Page 19
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