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Screwdriver Analysis

explanatory Essay
1317 words
1317 words
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Introduction:
Screwdrivers are very popular among the hand tools which we use in our daily use. But now a days the screwdriver demands hardness and higher torque values for the meeting the requirements and to compete between the manufacturers. For maintaining both torque and hardness in higher level. there are mainly three key factors for the producing the required type of screwdriver : heat treatment, material and machining processing. On the other hand the most famous type of steel used in the manufacturing of the screwdriver bit are Cr-V type of steel, material wise known as SAE6150 steel. The hardness of this material is known to be HRC52 (+ 0r - ,2) and the value of torque is about 180 - 190 kgf.cm. There are different varieties of tips for a screwdriver which include Robertson ,clutch, .Allen and Torx but very standard types of tips are flat, slotted, straight or flared.

Design Aspects of screwdriver:
The designing aspects of a screwdriver consist of a handle and a shaft. The shaft will be made of tough steel in order to prevent twisting or bending while usage. The handle can either be made with wood or rubber also with plastic. Mostly plastic material will be used for making the handle in order for better handling and for safety purpose.

Materials for manufacturing Screwdriver Tip :
Later a new variety of steel material is been used in the industry by the composition of different kinds of steel. The development of this material were used latterly in common for producing hard and high torque screwdriver, most importantly fractures cannot happened in this kind of material. The steel which we were talking about in the beginning was smelted in a high vacuum and forged to the required shape and they are welded in furth...

... middle of paper ...

... screwdriver which will result in deduction of discrete particles gradually from the material from the contacting surface of the screwdriver.

Improvements that can be made:
In manufacturing the handle we can use injection molding instead of extrusion method. Because extrusion molding method has a limitation in the types of handle it can make. Though extrusion method also can make a selective variety of handles but it will be more cost effective and time affective when compared to injection molding.

Conclusion:
A Screwdriver is a very common tool that is used to loosen or tighten a screw. Manufacturing wise this module (Material Engineering Design) gave us a different view over the materials and the tools which are made out of it. We now understand the manufacturing of things by the prospective of the design, process, assembling and failures that can occur.

In this essay, the author

  • Explains that screwdrivers require hardness and higher torque values for meeting the requirements and to compete between the manufacturers.
  • Explains the design aspects of a screwdriver. the shaft will be made of tough steel to prevent twisting or bending while usage.
  • Explains how different kinds of steel are used in the industry for producing hard and high torque screwdrivers. the steel is smelted in a high vacuum and forged to the required shape and are welded in further.
  • Explains as-rolled wire, spherical annealing, drawing, tip machining, heat treatment, shot blasting, (coating) and properties test.
  • Explains that the 1500 thermochemical simulator is used to determine the variations between the high temperature deformation resistance steel and the newly developed s2 steel.
  • Explains that nickel plating provides a protective shield as corrosion and wear resistance. however, for expert procedure, instead of nickel plated, nickel flash bath can be done.
  • Explains the two key mechanical properties for screwdriver bits are toughness and hardness value. the rockwell hardness test machine in hrc unit is identified by the former.
  • Explains how the screwdriver handles are made by mixing the plasticizer with the cellulose acetate and then extruding the material. the bars are drilled and cleaned to inset the rod in place.
  • Explains that the failure mechanism is very rare but can happen if the heat treatment process is not done properly.
  • Explains that over exposing the shaft to energy can cause this kind of failure in a screwdriver.
  • Explains that a screwdriver failure can occur if it is subjected to constant stress and the environment in which the product is used.
  • Explains that ductile failure is a kind of failure where the product is placed under long-term stress.
  • Explains that if the product is used in chemical or electrochemical surroundings, the corrosion will result in metal dusting. oxidation of the metal is also a kind of corrosion failure.
  • Explains that the cumulative use of the screwdriver will result in the deduction of discrete particles gradually from the material.
  • Explains that in manufacturing the handle we can use injection molding instead of extrusion method because it has a limitation in the types of handle it can make.
  • Explains that the material engineering design module gave them a different view over materials and tools. they now understand manufacturing by the prospective of the design, process, assembling and failures that can occur.
  • Explains that spheroid wire is used to obtain the properties of screwdriver bit and undergoes a subsequent heat treatment. the specimens are held at different austenitizing temperatures versus further oil quenched and time.
  • Explains that thermosetting plastics are fabric-type materials that anneal when heated but can be reheated and remolded as many times as we want without any change in the properties of the material.
  • Explains the thermoplastic material used for making a screw driver handle is poly methyl methacrylate (pmma) which is also known as perspex or acrylic glass.
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