International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
www.irjet.net
Design and Manufacture of Fixture for Manually Operated Spot Welding Machine Palak Agrawal1, Soniya Bokil2, Varad Babhulgaonkar3 Prof. Dr. N.G. Jaiswal4 1, 2,3 Final
UG Students, Dept. of Mechanical Engineering, PVG’s COET, Pune, Maharashtra, India Professor, Dept. of Mechanical Engineering, PVG’s COET, Pune, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------4
Abstract - Resistance spot welding is a process which is
drilling a workpiece; while the other time is spent primarily in planning, of execution of part setup or work holding.
generally used for sheet metal joining purposes in industry. The physical joining processes cannot be performed without the use of fixtures. A fixture is a production tool that locates, holds and supports the work securely so that the required machining operations can be performed. In case of resistance spot welding, the fixture must hold the workpieces in correct relationship during joining , and must offer adequate support during the process. This research emphasizes on the design and manufacturing of a fixture for a hollow cylinder which has its application in separation of solid-liquid mixture in Food Processing, Waste Recycling units. The new fixture increases functionality, also longer and workpieces of varying diameters can be welded.
A fixture is a device for locating, holding and supporting a work piece during a manufacturing operation. Fixtures are essential elements of production processes as they are required in most of the manual/automated manufacturing, inspection and assembly operations. The perfect fixture can be used repeatedly to produce the same parts in the production process. A fixture reduces the operators labour and consequent fatigue as the handling operations are minimized. Also, it reduces the overall cost of machining by completely or incompletely automatizing the process.
1.2 Need for Fixture
Key Words: Fixture, Design, Spot-Welding, Analysis, Workpiece, Forces
The manual spot-welding machine, has an existing hydraulically operated guideway system. This guideway system facilitates the translatory movement of the cylindrical workpiece along the weld path. However, the welding process cannot be carried out unless the movement of the cylinder is restricted. The welding will be successful only when there is contact between the electrodes and the workpieces. As the cylinders are of varying lengths and diameters, a tool that compensates the height difference between the electrodes and cylindrical surfaces is required. Hence, there arises a need for fixture.
1.INTRODUCTION We are working on design of fixture for SCIAKY Manual SpotWelding Machine; this machine is used to weld ribs (Steel strips,3mm) on the inner surface of the hollow cylinder. The specifications of the machine are as follows: Throat Depth = 1400 mm Maximum Electrode Forge = 1000 Kg Air Pressure = 5.6 kg/cm2 The electrode actuation takes place by manually operated pneumatic pedal. These copper electrodes, apply pressure and heat to the weld area by passing a high amount of electric current through the thickness of cylinder and ribs. Due to the pressure and heat, the metal at weld area melts and fuses the workpiece together. The molten nugget solidifies to form a joint.
1.1 Fixture One of the most time-consuming and labour extensive processes in the manufacturing of a mechanical part is the process of work holding or fixturing. In many studies it has been stated that roughly only 10-15% of the overall time needed to produce a part is spent actually on cutting or
© 2022, IRJET
|
Impact Factor value: 7.529
Fig - 1 : Spot Welding Machine with Guideways
|
ISO 9001:2008 Certified Journal
|
Page 1475