WHAT ARE THE REQUIREMENT OF MACHINING?

The blank and the cutting tool are properly mounted (in fixtures) and moved in a powerful device called machine tool enabling gradual removal of layer of material from the work surface resulting in its desired dimensions and surface finish. Additionally some environment called cutting fluid is generally used to ease machining by cooling and lubrication. 

The Seven Requirements:

1. Quality Tooling

2. Proper Machine Condition

3. Simplicity of Operation

4. Rigidity

5. Proper Speed to Feed Relationship

6. Proper Cutting Fluid 

7. Operator Training 

CLICK HERE FOR MORE DETAILS

what is the purpose of machining?

(a) Purpose of Machining 

Most of the engineering components such as gears, bearings, clutches, tools, screws and nuts etc. need dimensional and form accuracy and good surface finish for serving their purposes. Preforming like casting, forging etc. generally cannot provide the desired accuracy and finish. For that such preformed parts, called blanks, need semi-finishing and finishing and it is done by machining and grinding. Grinding is also basically a machining process. Machining to high accuracy and finish essentially enables a product
                                  • fulfill its functional requirements
                                  • improve its performance
                                  • prolong its service




                              

DEFINE PRINCIPLE OF MACHINING?

A metal rod of irregular shape, size and surface is converted into a finished rod of desired dimension and surface by machining by proper relative motions of the tool-work pair.

The basic principle of machining is typically illustrated in FIG.

CLICK HERE for more details

DEFINITION OF MACHINING

Machining is an essential process of finishing by which jobs are produced to the desired dimensions and surface finish by gradually removing the excess material from the preformed blank in the form of chips with the help of cutting tool(s) moved past the work surface(s). 

HOW TO CLASSIFY THE MANUFACTURING PROCESS ?

It is extremely difficult to tell the exact number of various manufacturing processes existing and are being practiced presently because a spectacularly large number of processes have been developed till now and the number is still increasing exponentially with the growing demands and rapid progress in science and technology. However, all such manufacturing processes can be broadly classified in four major groups as follows: 

(a) Shaping or forming Manufacturing a solid product of definite size and shape from a given material taken in three possible states: • in solid state – e.g., forging rolling, extrusion, drawing etc. • in liquid or semi-liquid state – e.g., casting, injection moulding etc. • in powder form – e.g., powder metallurgical process. 

(b) Joining process Welding, brazing, soldering etc. 

(c) Removal process Machining (Traditional or Non-traditional), Grinding etc.

(d) Regenerative manufacturing Production of solid products in layer by layer from raw materials in different form: • liquid – e.g., stereo lithography • powder – e.g., selective sintering • sheet – e.g., LOM (laminated object manufacturing) • wire – e.g., FDM. (Fused Deposition Modelling) Out of the aforesaid groups, Regenerative Manufacturing is the latest one which is generally accomplished very rapidly and quite accurately using CAD and CAM for Rapid Prototyping and Tooling.  

for more details CLICK HERE

what is manufacturing?

The process of converting raw materials, components, or parts into finished goods that meet customer’s expectations or specifications. Manufacturing commonly employs a man-machine setup with division of labor in a large scale production.Manufacturing is the production of merchandise for use or sale using labor and machines, tools, chemical and biological processing, or formulation. The term may refer to a range of human activity, from handicraft to high tech, but is most commonly applied to industrial production, in which raw materials are transformed into finished goods on a large scale. Such finished goods may be used for manufacturing other, more complex products, such as aircraft, household appliances or automobiles, or sold to wholesalers, who in urn sell them to retailers, who then sell them to end users and consumers. Manufacturing takes turns under all types of economic systems. In a free market economy, manufacturing is usually directed toward the mass production of products for sale to consumers at a profit. In a collectivist economy, manufacturing is more frequently directed by the state to supply a centrally planned economy. In mixed market economies, manufacturing occurs under some degree of government regulation.

                                            click here for more details

WHAT IS FABRICATION ?

Manufacturing process in which an item is made 

(fabricated) from raw or semi-finished materials instead of being assembled from ready-made components or parts.

Metal fabrication  is the building of metal structures by cutting, bending, and assembling processes. It is a value added process that involves the construction of machines and structures from various raw materials. A fab shop will bid on a job, usually based on the engineering drawings, and if awarded the contract will build the product. Large fab shops will employ a multitude of value added processes in one plant or facility including welding, cutting, forming and machining. These large fab shops offer additional value to their customers by limiting the need for purchasing personnel to locate multiple vendors for different services. Metal fabrication jobs usually start with shop drawings including precise measurements then move to the fabrication stage and finally to the installation of the final project. Fabrication shops are employed by contractors, OEMs and VARs. Typical projects include loose parts, structural frames for buildings and heavy equipment, and stairs and hand railings for buildings.

                                                       FOR MORE DETAIL CLICK HERE