2.47 One of the principal concerns w ith coolants is degradation due to biological attack by bacteria. To prolong the life of a coolant, chemical biocides often are added, but these biocides greatly complicate the disposal of the coolant. Conduct a literature search concerning the latest developments in the use of environmentally benign biocides in cutting fluids.

2.47 One of the principal concerns w ith coolants is degradation due to biological attack by bacteria. To prolong the life of a coolant, chemical biocides often are added, but these biocides greatly complicate the disposal of the coolant. Conduct a literature search concerning the latest developments in the use of environmentally benign biocides in cutting fluids.

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.8: Maintenance, Lubrication, And Cutting Fluid Overview

Problem 9RQ: What two ingredients are often used as additives to improve lubrication qualities of cutting oils?

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Similar questions

22.44 O btain data on the therm al properties of various commonly used cutting fluids. Identify those which are basically effective coolants (such as water-based fluids) and those which are basically effective lubricants (such as oils).
What two ingredients are often used as additives to improve lubrication qualities of cutting oils?
22.18 Describe the reasons for and advantages of coating cutting tools with multiple layers of different materials.
22.39 What are the consequences of a coating on a tool having a different coefficient of thermal expansion than the substrate material?
Manufacuring Processes An electro chemical machining (ECM) operation is employed too cut a square hole in a copper plate of 18 mm thickness. The dimensions of the hole is 20 mm on each side, however, the electrode dimension shall be slightly less than 20 mm to allow for overcut, and its shape includes a hole in its center to permit the flow of electrolyte and reduce the area of cut. The frontal area of electrode is 180 mm2. The specific removal rate for copper is C = 7.35 x 10-2 mm3/A-s. The applied current is 950 A. At 90 % efficiency, determine the time required to cut a hole of required dimensions.
22.33 In Table 22.1, the last tw o properties listed can be im portant to the life of a cutting tool. Why?
Question 1. Provide brief explanations to each one of the following questions: 1.a. Explain why studying the types of chips produced is important in understanding cutting operations. 1.b. Describe the reasons for and advantages of coating cutting tools with multiple layers of different materials. What are the possible effects of these coatings on the developed chip during cutting process 1.c. Describe the reasons for and advantages of coating cutting tools with multiple layers of different materials. 1.d. Emulsion cutting fluids typically consist of 95% water and 5% soluble oil and chemical additives. Why is the ratio so unbalanced? Is the oil needed at all? 1.e. What is the difference between a live center and a dead center, when these terms are used in the context of workholding in a lathe?
22.4 Why are some tools coated? What are the common coating materials?
6) Why are most broaches made from alloy or high-speed steel rather than from tungsten carbide. 7) In water jet cutting, alcohol, oil products & glycerol are added and dissolved in water. why.
2 2 .4 1 Emulsion cutting fluids typically consist of 95% water and 5% soluble oil and chemical additives. W hy is the ratio so unbalanced? Is the oil needed at all?
The frontal working area of the electrode in an Electrochemical Machining (ECM) operation is 1000 mm. The applied current is 900 amps and the voltage is 12 volts. The resistivity of the electi olyte is 140 Q-mm. The material being cut has a valency of 4 and specific removal rate of 0.0342 mm /A-s. If the process efficiency is 90%, determine the material remova! rate (MRR) and inter-electrode gap after 30 minutes of machining when the resistivity of the electrolyte has dropped to 75% of its original value.
04 05 a Explain the reasons for the following: 1- The pure aluminum and the copper are generally rated as easy to machine 2- In ultrasonic machining, the stress produced by the impact of abrasive particles on the workpiece surface is high. 3- In rolling process, the coefficient of friction must be sufficient. 4- Difference in solidification between casting and welding processes. 5- Why is it desirable to use energy sources for welding that have high heat densities? 6- Why there might be a change in the density of a forged product as compared to that of the cast blank. D. A cylindrical workpart with D=2.5 in and h=2.5 in is upset forged in an open die to a height = 1.5 in. Coefficient of friction at the die -work interface = 0.10 The work material has a flow curve defined by: K= 40,000 lb/in' and n-0.15. Determine the instantaneous force in the operation (a) just as the yield point is reached (yield at strain = 0.002), (b) at height = 2.3 in. (c) h= 1.9 in, and (d) h = 1.5 in. a List…