The Influence Of Experimental Values On Machined Machines

Precision Machining Inc. is a 65 year old organization which provides services such as welding, fabrication, machining, prototype design, engineering, certification, assembly, and forming (CSU-Global, 2015). Their specialization is working with stainless steel, but they are versed in a number of other appropriate materials. The company is extremely committed to high quality customer service by meeting unusual requests and demands (2015).

With the ideal of running high speeds, most cutting tool makers say the cutting capability of most inserts is not fully used yet. The push for cutter upgrades is in opposite directions. Tool makers with consistent jobs want cutters created for specific materials and speed ranges, but those with more general work want one tool to do more with less changing of tools and inserts. A lot can be done to improve cutting tools, including insert geometry, different materials, and different holders. As the range of spindle speeds and feeds gets wider, the need to upgrade tool holders has gotten greater to reduce vibration and movement of the tool. One huge benefit of having better inserts and stiffer turning machines is a process called hard turning. Here recently it has been replacing some grinding practices as well as opening up new applications and opportunities. Instead of rough cutting and then hardening, and finishing by grinding, hard turning is done on a lathe after the hardening operations have already taken place. Machine cutting tool makers will soon be faced with a new group of problems as composites, more particularly carbon-fiber-reinforced materials become more

Different modeling approaches have been studied for modeling the machining of composites and CMCs, including

Metal reinforced Polyester composite has been increasingly drawn the attention of the researchers for the last decades. Light weight along with high strength materials can replace traditional construction materials used in building engineering, aeronautics, mechanical engineering and in many other domains. It is related to a possibility of obtaining practically any combination of beneficial properties of the material, e.g. high vibration damping coefficient, high abrasion resistance, high value of the Young’s modulus, low specific gravity and low coefficient of thermal expansion [1, 2, 3, 4] .

Aerospace design applications rely heavily on weight reduction, structural integrity and optimize performance. Engineers and designers have adopted carbon fiber composite due to its high modulus reinforcement fibers embedded in an epoxy matrix.

Today I will be talking about the research I did on quick change methodology. This is a very fascinating and important topic for the machining process in all plants across the world. The topics that will be covered in this paper are as follows defining quick change methodology and tooling for machining with an overview history and recent advancements, SMED overview history and recent advancements, then a compare and contrast of quick change methodology and SMED, and to wrap up the paper I will illustrate how I can use this information to improve a manufacturing process I am familiar with. These were great research topics and I learned a ton of great valuable information that would be very useful in future endeavors.

PCD tools are similar to bonded diamond grit tools in that they both start with fine diamond particles. However, the PCD method involves forming the particles into a dense sintered material using a binder made from cobalt. These cemented compacts are then brazed into various shapes (for different kinds of cutting tools) and brazed onto solid carbide tool bodies. The PCD tools edge can then be ground down to a finished shape and even reground for tool sharpening purposes. PCD tools are over 50 years old and are prevalent in the aerospace industry for drilling rivet holes into carbon fiber composite materials. The automotive industry also uses these tools for machining of aluminum composites which contain high silicone content (e.g. Al 390). These tools can be expensive, but are often the best option for very high precision cuts and high impact loading [2].

Being a composite material, the properties of the GFRP are determined by: the choice of resin and glass type, the volume fractions of the fibres and the matrix, the manufacturing techniques employed and the material properties of its constituent parts. Much of the current literature describes and highlights the variability in GFRP properties owing to the above [3][4][5]. The most commonly used resins in the production of GFRP are polyester and epoxy resins, which are both thermosetting polymers. This means that high temperature and pressure are not required in the manufacturing process, making GFRP a versatile material, albeit a relatively expensive one. Both of these resins were investigated here, with the focus eventually shifting towards polyester resin.

A composite used for tension testing was fabricated by cutting out six same-sized pieces of bi-directional E-glass: two at ± 〖90〗^o and four at ± 〖45〗^o. The pieces were adhered to one another using a wet lay-up with the six pieces of bi-directional E-glass at the following angles in

Measurement of shear modulus is also necessary. Two methods are reviewed for obtaining shear modulus: the Iosipescu shear test [15] and V-notch rail shear test [16]. Both of these tests have a rectangular specimen with notches cut in order to concentrate shear stress at the neck. It is how the specimen is loaded differentiates these two tests. The Iosipescu method utilizes a special equipment which loads the specimen along its edges by exerting compressive force. The V-Notched rail shear method uses another specialized fixture to grip the faces of the specimens and shears the specimen in tension. These two methods apply different forces in different locations of the composite specimen, therefore, it is reasonable to expect that each of the two approaches can give slightly different shear modulus. Yan-lei et al. evaluated these two methods in his study [17]. Although the Iosipescu shear specimens can give good results, he claims that edge crushing can be an issue due to the way the specimen is loaded into the fixture. And V-notched rail shear method can get rid of such unacceptable failure and it uses a larger gauge section, so this method has more

FRP composites having superior material properties when compared with metals, improved corrosion resistance, fatigue resistance, less weight to strength ratio and high fracture toughness. Hence GFRP composites frequently used in several applications like sports goods, racing car bodies and aerospace components [1]. Often composite products manufactured by near-net shapes. The components made by secondary machining processes are involving to get good dimensional accuracy and geometrical shapes done by turning, drilling

From the analysis report of Response Surface Regression Fig. 6.1 & Fig. 6.2 it can be seen that tool rotational speed has greater influence on both Ultimate Tensile Strength and Weld Nugget Hardness compared to other parameters.

Introduction: It has been well established that drilling of FRP’s lead to drilling induced damage thus reducing component’s life and reliability. Thrust force induced in drilling of FRPs is one of the major reasons for drilling induced damage [1]. Several studies have been made worldwide to critically review the delamination induced in drilling of FRPs. These research efforts clearly indicate direct relationship of damage induced with thrust force induced during drilling of FRPs [2-6]. Various mechanistic, mathematical and analytical models have been developed based on different reasoning,

Abstract: This paper reviews on the various analyzing techniques of chatter stability in high speed milling. Milling at high spindle speed is an effective technology for processing various materials. During milling, unstable self-excited vibrations known as regenerative chatter can occur, causing excessive tool wear or failure and a poor surface finish on the machined work piece. There are several analyzing techniques that are used to increase the stability of the machining process such as, fuzzy arithmetic techniques, stability lobe diagram(SLD),Structural dynamic modification. Based on these analyzing techniques how the operating variables are changed to obtain the different predicted results is studied.

I would sincerely like to express my gratitude for BHEL Haridwar, for providing me the opportunity of pursuing my vocational training in this renowned industry and endowing me with an un parallel experience and deep understanding of a wide array of processes and manufacturing methods taking place in different workshops of the industry. I would also take this opportunity to thank our training in charge, Mr. Rajmani Jaiswal whose guidance and motivation went a long way in our understanding of different sections of the industry. Furthermore, I would thank my institute, Indian Institute of Technology Roorkee for giving me opportunity of visiting the industry and