International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 03 | Mar 2024
p-ISSN: 2395-0072
www.irjet.net
Design of Fixture for Boring and Drilling operation on Small end of a Connecting Rod Digvijay Chavan1 1B.E., Department of Mechanical Engineering, AISSMSCOE, Pune, Maharashtra, India
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Abstract - The objective of this paper is to design and
requirements, a fixture layout that fulfills all necessary aspects is selected as the optimal fixture layout for a given component. This ensures that the manufacturing process operates smoothly and effectively, resulting in high-quality components produced within the specified tolerances.
develop a dedicated fixture for the drilling and boring operations on the small end of a connecting rod using a Special Purpose Machine (SPM). Initially, the features and functional requirements of the operations are studied upon, based on which a rough sketch of the fixture is made using Solid Edge. Limits, fits, and tolerances are provided for the fixturing components in between mating components wherever necessary. Since the two operations were to be performed on two different machines, various designs were considered to obtain an efficient fixture that could perform all the operations in the least amount of time.
1.1 Fixture Design The fixture comprises various components, including the locating system, clamping system, and supporting system, all carefully chosen to suit the specific requirements of the component being worked on. Locators are particularly critical as they ensure consistent positioning of the component during mounting. It's essential that locators are positioned for ease of mounting, while the clamping system applies adequate force against them to secure the component firmly in place. Different types of locators, such as round and diamond pins, floating locating pins, bullet nose dowels, bullet nose pins, and cone locator pins, are employed based on specific needs. Diamond pin locators, for instance, are valuable for compensating for gaps between locating surfaces. Clamping techniques, including strap clamps, hinged clamps, quick-action clamps, and poweroperated clamps, are chosen to ensure that the clamping force is directed appropriately onto the workpiece, holding it securely. In instances where multiple clamps are necessary, the use of power-operated clamping can expedite the loading and unloading process, reducing operator fatigue.
Key Words: SPM, Solid Edge, Connecting Rod, Drilling, Boring, Fixture
1.INTRODUCTION The fixture is a device utilized for locating, holding, and clamping the given component in its respective position during manufacturing processes. Additionally, it guides the tool with the assistance of a jig plate and bushes. The value of fixture design and manufacturing typically constitutes approximately 10-20% of the overall manufacturing process cost. Various types of fixtures exist according to their applications, such as machining fixtures, assembly fixtures, and inspection fixtures. Machining fixtures are primarily classified into two types: dedicated fixtures and modular fixtures. Dedicated fixtures are employed in mass production scenarios where the setup remains constant throughout production runs. Conversely, modular fixtures are utilized in batch-type production as they can accommodate similar products within the batch, owing to their reconfigurable nature. The use of automation in fixture design is referred to as computer-aided fixture design, which significantly reduces the time required for fixture design by eliminating the traditional trial-and-error method. Several software applications are employed for fixture design, facilitating more efficient and precise outcomes. The primary objective of any fixture design is to manufacture the given component with utmost accuracy, thereby minimizing the loading and unloading time of the component. This reduction in time helps alleviate operator fatigue, subsequently enhancing productivity. Achieving interchangeability of components is crucial in fixture design as it directly impacts the accuracy of the manufactured components. Fixture design often necessitates multi-modal solutions to meet various fixturing requirements. By considering the generic fixturing
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The process of fixture design typically involves four main stages: setup planning, fixture planning, unit design, and verification. During setup planning, the orientation of the component is determined, taking into account its machining features. Fixture planning involves defining the desired characteristics and requirements of the fixture and its layout to ensure effective fulfillment of objectives. Finally, fixture design verification evaluates the fixture against predetermined criteria to ensure it functions as intended. Any discrepancies or issues are addressed and resolved during this phase to guarantee the fixture's efficacy in the manufacturing process.
1.2 Objective The objective of this paper are: 1.
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To design 2 fixtures, one dedicated for drilling and one for boring operation
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