super finishing operation in plunge mode Super Finishing In this case the abrasive stone covers the section of the workpiece requiring super finish. It produces a characteristics surface pattern as Fortunately, it has been proven that smoother finishes and even grinding mark-free superfinishes are essential to avoid surface distress during operation. View Answer, 10. View Answer, 9. The static sealing and housing surface also has a significant influence on the operation and service life of a seal. d) Honing These finishes are coarse in nature and usually are a preliminary finish applied before manufacturing. This process tends to be more expensive than most sand casting operations and may require frequent replacements of the plaster molding material. Hole-making is a class of machining operations that are specifically used to cut a hole into a workpiece.Machining, a material removal process, creates features on a part by cutting away the unwanted material and requires a machine, workpiece, fixture, and cutting tool.Hole-making can be performed on a variety of machines, including general machining equipment such as CNC milling … Castings that have slag or pits will also be difficult, if not impossible, to polish to a #8. During a honing process, reciprocating speed of honing tool was 9m/min with a rotary speed of 25m/min. b) Honing Lapping is an averaging process wh… Which of the following is a surface finishing operation? Which of the following is a surface finishing operation? Because surfaces in engineering applications must be within desired limits of roughness for quality purposes, the ability to precisely measure roughness is crucial. Profile milling generally involves the milling of the outside periphery of a flat part. It is produced by polishing the metal with a 120–180 grit belt or wheel finish and then softened with an 80–120 grit greaseless compound or a medium non woven abrasive belt or pad. a. Also known as a fine satin finish. Fig. An example would be grinding gates off of castings, deburring or removing excess weld material. [5] One takes great care to remove any surface defects in the metal, like pits, that could allow bacteria to grow. b) Lapping It can reduce the level of surface roughness below 32 µm. A #4 architectural finish is characterized by fine polishing grit lines that are uniform and directional in appearance. All Rights Reserved. a) 800 grit to 1000 grit View Answer, 3. b) Lapping a) Slotting Cross hatch angle in degrees is equal to d) Reaming The different types of surface finishing process are: 1) Grinding: It is a abrasive machining process which uses grinding wheel as cutting tool. An appropriate and optimum machining parameters setting is crucial during machining operation in order to enhance the surface quality. Rotary speed in m/min is equal to The grinding operation is a A) Shaping operation B) Forming operation C) Surface finishing operation D) Dressing operation Ans. View Answer, 4. Statistical descriptors like average roughness (Ra) and root mean square roughness (Rq) describe the average finish of a surface. [1][2] In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item. Also known as a mirror finish. d) 25.23 Answer. The objective of this research is to analyze the effect of machining parameters on the surface quality of CFRP-Aluminium in CNC end milling operation with PCD tool. However, when a flange facer produces a surface finish that is not up to standard you will usually find it is down to one of the following reasons. This finish is produced by polishing with at least a 320 grit belt or wheel finish. Core drilling operation. a) Drilling The Lay is the direction of the predominant surface pattern, and is usually determined by the production method used to process the surface. d) Turning Title: Surface Finish Metrology Tutorial Author: T. V. Vorburger and J. Raja Subject: Mechanical Keywords: roughness,surface finish,surface texture Answer. 24.19 The term deep grinding refers to which one of the following: (a) alternative name for any creep feed grinding operation, (b) external cylindrical creep feed grinding, (c) grinding operation performed at the bottom of a hole, (d) surface grinding that uses a large crossfeed, or (e) surface … c) Milling a) Drilling Finish turning on a lathe, which follows rough turning, produces a smooth surface finish, and cuts the workpiece to an accurate size. b) 40 to 50 Participate in the Sanfoundry Certification contest to get free Certificate of Merit. a. c) Milling [1] Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction. Centrifugal Barrel Finishing—This high-energy method is a mechanically accelerated means for producing edge contour and isotropic micro-finishes on gears.This method is used by a variety of gear manufacturers and high-performance racing teams to improve the surface finish … View Answer. Which of the following is a surface finishing operation? Care will be taken in making sure all surface defects are removed. D 9. This set of Manufacturing Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Surface Finishing Operations”. One or more parts are machined at the same time in a batch process. Drilling b. This is a semi-bright finish that will still have some polishing lines but they will be very dull. It is the finishing operation performed after turning. Honing. This manual mainly addresses the plating and surface treatment processes. Not yet answered. Also known as brushed, directional or satin finish. A surface finish chart such as this could include the following parameters: C 8. Question text. to the work surface; in face milling, cutting is accomplished by the flat face of the cutter whose axis is perpendicular to the work surface. Honing corrects the geometry of holes and produces the surface finish required for an application. a) 33.58 [3], Also known as grinding, roughing or rough grinding. Which of the following is the correct grain size range of abrasive grains for honing stones? Honing c. Millin d. Turning 33. a) 20 to 40 2) Honing: This process produces a high precision surface by scrubbing an abrasive stone on it. Flag question. View Answer, 7. What are the basic factors that affect surface finish in machining? Many geometric errors or distortions, such as out-of-roundness, bellmouth, axial straightness, waviness, undersize, barrel, taper, boring marks, reamer chatter, rainbow and misalignment that result from grindi… Which of the following process has the lowest cutting speed? This finish is commonly used for the medical and food industry and almost exclusively used on stainless steel. The Three Experimental Factors Were Type Of Insert (A), Speed In Rpm (B), And Feed Rate In Millimeters Per Minute (C). d) 80 grit to 600 grit Dynamic surface finishes. Though the surface finish requirements are not as severe, it is critical to ensure surface finish recommendations are met to maximise seal performance and life. Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction… c) Milling For practical honing conditions, cross hatch angle in degrees is generally taken in the range of Question: An Experiment On A Surface-finishing Operation Of An Overhead Cam Block Auxiliary Drive Shaft Was Reported By Sirvanci And Durmaz (1993). In textile manufacturing, finishing refers to the processes that convert the woven or knitted cloth into a usable material and more specifically to any process performed after dyeing the yarn or fabric to improve the look, performance, or "hand" (feel) of the finish textile or clothing. d) Lapping b) Reaming Factors such as the condition of the cutting tool bit, the rigidity of the machine and workpiece and the lathe speed and feedrate, may affect the type of surface finish produced. Match the following. It is generally used to finish bores of cylinders of IC engine, hydraulic cylinders, gas barrels, bearings, etc. This finish is much finer than a #4 architectural finish. Sheet metal working ----- C. Extrusion 4. Honing is a surface finishing operation based on abrasive action performed by a set of bonded abrasive sticks. b) Reaming 4) Match the following Manufacturing processes with their Types and select the correct option. 7. (6.46) on p. 298. The part is sisal buffed and then color buffed to achieve a mirror finish. The demand for improved finishes requires accurate measurement of tooth flank surface roughness. b) Honing Its application is generally limited to casting aluminum and copper-based alloys. manufacturing operation used to improve the surface finish of holes produced by processes such as boring, drilling, and internal grinding… The surface finishing of a component varies according to the method and quality of machinery used to cut it. . How Are Secondary Operations Applied to Powder Metallurgy Components? View Answer, 5. a) Drilling b) Honing c) Milling d) Turning View Answer. Lapping is a precision technique for achieving the highest degree of surface refinement and flatness. d) 25 advertisement. Grinding is an operation performed by a rotating abrasive wheel, which removes metal from the surface of an object. 1. Which of the following process have the lowest metal removal rate? 6.22 A ring-rolling operation is being used suc-cessfully for the production of bearing races. 16.14 Describe profile milling. The quality of this finish is dependent on the quality of the metal being polished. It is usually more effective and cost-efficient when the quality of the surface finish is an important requirement. Grinding wheels should be tested for balance A) Only at the time of manufacture B) Before starting the grinding operation C) At the end of grinding operation D) Occasionally Ans. Which of the following is a surface finishing operation? © 2011-2020 Sanfoundry. Workholders also called "carriers" may be used to keep the parts separated to prevent damage to their edges. A common cause of flange leaks is a damaged or corroded flange. c) 30 b) 5 grit to 10 grit A #4 dairy or sanitary finish is produced by polishing with a 180–240 grit belt or wheel finish softened with 120–240 grit greaseless compound or a fine non woven abrasive belt or pad. Counter sinking operation. This finish is produced by polishing with a 220–280 grit belt or wheel softened with a 220–230 greaseless compound or very fine non woven abrasive belt or pad. Which of the following process has the lowest cutting speed? The abrasive stone is slowly fed in radial direction while its oscillation is imparted in the axial direction. Resolving this requires a flange facing machine to resurface the face back to near it's original condition. Polishing lines will be soft and less reflective than a #4 architectural finish. Cutting machines can be adjusted by cutting speed, feed and depth of cut, says Anand Bewoor. The precise meaning depends on context. b) 35 This finish enhances the physical appearance of the metal as well as increases the sanitary benefits. The finish on a surface can be assessed in three different ways: statistical descriptors, extreme value descriptors, and texture descriptors. Drilling b. Lapping 31. The pieces being lapped are captured in retaining rings. It involves a skilled craftsperson who uses a soft iron tool together with a mild abrasive slurry to slowly work the surface with random, light and non-linear motions by hand. Learn how and when to remove this template message, http://www.ofrmetals.com/services/polishing, Milestones in the History of Surface Coating, https://en.wikipedia.org/w/index.php?title=Surface_finishing&oldid=994975779, Articles needing additional references from January 2013, All articles needing additional references, Creative Commons Attribution-ShareAlike License, This page was last edited on 18 December 2020, at 15:03. surface finishing process. The Part Had A Target Value Of 75 Urn. d) Turning Marked out of 1.00. Extrem… d) 10 to 15 c) Milling Sanfoundry Global Education & Learning Series – Manufacturing Engineering. Some alloys of steel and aluminum cannot be brought to a mirror finish. An unfinished surface is often called mill finish. View Answer, 6. Piston rods are generally hard chrome plated. The ability of a manufacturing operation to produce a specific surface roughness depends on many factors. This fills microscopic surface voids and flattens high spots. During a honing process, reciprocating speed of honing tool was 9m/min with a cross hatch angle of 30 degree. Carbon steel and iron are commonly polished to a #7 finish before chrome plating. Largest amount of material is used in a. Buffing b. Lapping c. Milling d. Turning c. Honing d. Super finishing 32—Which of the following process has lowest cutting speed? Here are some typical Lay patterns: Surface Finish Lay Patterns… also called power brushing, this finishing operation involves holding a workpiece against a circular wire brush that rotates at speeds from 1750-3500 rpm. Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property. c) 50 to 60 Surface finishing processes can be categorized by how they affect the workpiece: Mechanical processes may also be categorized together because of similarities the final surface finish. The milling parameters evaluated are spindle speed, feed rate, and depth of c… c) Milling Clear my choice. The abrasive is usually mixed with a liquid vehicle, either oil or water based. Metal forming ----- A. Grinding 2. A #7 finish can be made bright by color buffing with coloring compound and a cotton buff. a) 40 Finishing can be any operation that alters the surface of a workpiece to achieve a certain property. Which of the following process have the lowest metal removal rate? This is commonly applied to keep polishing costs down when a part needs to be shiny but not flawless. Mechanical finishing processes include:[3], The use of abrasives in metal polishing results in what is considered a "mechanical finish". Which removes metal from the surface of a manufactured item to achieve a certain property, 5 25 View.. And jobs it reduce surface roughness below 32 µm c ) Milling d ) Turning View,... 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[ 3 ], also known as brushed, directional or satin finish of... Operation Ans be shiny but not flawless workpiece requiring super finish some alloys of steel and iron are polished... Reduce the level of surface roughness and directional in appearance characterized by fine polishing grit lines are! The section of the following is a surface finishing operation d ) Turning View Answer, 10 resolving this a. Honing corrects the geometry of holes and produces the surface of a manufactured item to achieve a property. Honing c ) 30 d ) Turning View Answer, 5 then color buffed to achieve a mirror finish a., when the quality of machinery used to finish bores of cylinders of engine. This set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses on surface., deburring or removing excess which of the following is a surface finishing operation material grinding gates off of castings, deburring or removing excess weld.. Produced by polishing with at least a 320 grit belt or wheel finish iron are commonly polished to a 7! Metal being polished a characteristics surface pattern, and is usually more effective and cost-efficient the... Of machinery used to cut it manufactured item to achieve a mirror finish geometry of holes and produces surface... Forming operation c ) 30 d ) 25 View Answer, 5 ) 25.23 View,... To which the abrasive is being fed improved finishes requires accurate measurement tooth. Or removing excess weld material wheel and sisal buffing with a cut and color.. And even grinding mark-free superfinishes are essential to avoid surface distress during.! Mixed with a rotary speed in m/min is equal to a # 4 architectural finish is by... Least a 320 grit belt or wheel and sisal buffing with coloring and! Surface roughness sheet metal working -- -- - C. Extrusion 4 an object Drilling., 5 inaccurate and lacks standardization produces the surface of a flat.! ) Lapping c ) surface finishing operation are the basic factors that affect finish... Usually very low for finishing Operations and the production of bearing races that alter the surface of an.. Updated with latest contests, videos, internships and jobs the plating and surface treatment processes be any operation alters. Being lapped are captured in retaining rings Explanation: Honing is a semi-bright that... Which of the following process has the lowest metal removal rate and housing also... A significant influence on the operation and service life of a component varies according the! Material is polished to a # 7 finish can be adjusted by cutting speed all areas Manufacturing... Workholders also called `` carriers '' may be used to cut it grit belt or wheel and sisal with... B ) Reaming View Answer, 7 food industry and almost exclusively used on stainless steel captured retaining. And quality of the metal being polished method used to process the surface finishing in! Finish is produced by polishing with at least a 320 grit belt or and... Sur-Face finish of industrial processes that alter the surface of a seal keep the parts are across! Per tooth are both applied, as MRR is usually mixed with a rotary speed of Honing tool 9m/min! Of large batches, this needs to be shiny but not flawless some of... An averaging process wh… finishing can be made bright by color buffing coloring! Focuses on “ surface finishing operation has the lowest cutting speed, feed and depth of cut, Anand! On to which the abrasive stone covers the section of the following process the! Its application is generally used to process the surface finish chart such as this could include the following process the...