Piston rods are generally hard chrome plated. Mechanical finishing processes include:[3], The use of abrasives in metal polishing results in what is considered a "mechanical finish". Finishing can be any operation that alters the surface of a workpiece to achieve a certain property. b) Honing Yet, to this day, flank roughness measurement is often inaccurate and lacks standardization. a) Drilling 16.14 Describe profile 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. d) Turning 1. This is commonly applied to keep polishing costs down when a part needs to be shiny but not flawless. d) 25.23 Which of the following is a surface finishing operation? b) 5 grit to 10 grit 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. View Answer. Also known as a fine satin finish. Honing corrects the geometry of holes and produces the surface finish required for an application. The different types of surface finishing process are: 1) Grinding: It is a abrasive machining process which uses grinding wheel as cutting tool. 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? It is usually a finishing operation which gives a good surface finish and high dimensional accuracy to workpieces which have already been machined by other methods. Polishing lines will be soft and less reflective than a #4 architectural finish. Lapping is a precision technique for achieving the highest degree of surface refinement and flatness. surface finishing process. Question 18. 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. View Answer, 5. 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. This set of Manufacturing Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Surface Finishing Operations”. a) Drilling Clear my choice. Dynamic surface finishes. Care will be taken in making sure all surface defects are removed. Also known as a mirror finish. Which of the following is a surface finishing operation? C 8. Which of the following process have the lowest metal removal rate? For practical honing conditions, cross hatch angle in degrees is generally taken in the range of It is generally used to finish bores of cylinders of IC engine, hydraulic cylinders, gas barrels, bearings, etc. This finish is produced by polishing with at least a 320 grit belt or wheel finish. Grinding is an operation performed by a rotating abrasive wheel, which removes metal from the surface of an object. The demand for improved finishes requires accurate measurement of tooth flank surface roughness. This finish is much finer than a #4 architectural finish. Which of the following process have the lowest metal removal rate? 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Cross hatch angle in degrees is equal to Which of the following process has the lowest cutting speed? 30. Some alloys of steel and aluminum cannot be brought to a mirror finish. It reduce surface roughness and increase bearing load capacity. [3], Also known as grinding, roughing or rough grinding. 2. b) Reaming Sanfoundry Global Education & Learning Series – Manufacturing Engineering. Finish turning on a lathe, which follows rough turning, produces a smooth surface finish, and cuts the workpiece to an accurate size. All Rights Reserved. c) 30 Common metal finishes include paint, lacquer, ceramic coatings, and other surface treatments. Core drilling operation. 4) Match the following Manufacturing processes with their Types and select the correct option. Gun drilling. An unfinished surface is often called mill finish. The grinding operation is a A) Shaping operation B) Forming operation C) Surface finishing operation D) Dressing operation Ans. The quality of the machining is measured from surface finished and it is considered as the most important aspect in composite machining. d) 80 grit to 600 grit c) 30 Sheet metal working ----- C. Extrusion 4. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. a) Drilling b) Honing c) Milling d) Turning View Answer. Fig. However, in finishing operations, it is a factor to be put on hold, bringing roughness and precision to the forefront. For low roughness, usually low cutting speeds and feed per tooth are both applied, as MRR is usually very low for finishing. Also known as brushed, directional or satin finish. d) 10 to 15 One type of metal surface finish chart might describe surface finish parameters — that is, the different units of measurement and the arithmetic calculations used to describe surface finish. 7. 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. d) 25 b) 40 to 50 a. c) 50 to 60 Surface finish ----- B. Rivetting 3. b) Reaming Honing c. Millin d. Turning 33. The finish on a surface can be assessed in three different ways: statistical descriptors, extreme value descriptors, and texture descriptors. 70. c) Milling The Lay is the direction of the predominant surface pattern, and is usually determined by the production method used to process the surface. In roughing operations and the production of large batches, this needs to be maximized. Honing. d) Honing Workholders also called "carriers" may be used to keep the parts separated to prevent damage to their edges. c) 50 grit to 60 grit The precise meaning depends on context. This finish is commonly used for the medical and food industry and almost exclusively used on stainless steel. The Part Had A Target Value Of 75 Urn. This is a semi-bright finish that will still have some polishing lines but they will be very dull. A sintered powder metallurgy (PM) component can be finished or treated just like any other metal component to achieve desired characteristics—corrosion resistance, improved strength and hardness, surface wear resistance, edge-sharpness relief, porosity sealing, and control of size and surface finish. Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property. 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… super finishing operation in plunge mode Super Finishing In this case the abrasive stone covers the section of the workpiece requiring super finish. Which of the following is the correct grain size range of abrasive grains for honing stones? a) Drilling c) Milling D 9. The milling parameters evaluated are spindle speed, feed rate, and depth of c… Which of the following is a surface finishing operation? 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. Honing is a surface finishing operation based on abrasive action performed by a set of bonded abrasive sticks. © 2011-2020 Sanfoundry. It is the finishing operation performed after turning. The Three Experimental Factors Were Type Of Insert (A), Speed In Rpm (B), And Feed Rate In Millimeters Per Minute (C). c) Milling 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… Resolving this requires a flange facing machine to resurface the face back to near it's original condition. Flag question. 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. Title: Surface Finish Metrology Tutorial Author: T. V. Vorburger and J. Raja Subject: Mechanical Keywords: roughness,surface finish,surface texture c) Milling Question: An Experiment On A Surface-finishing Operation Of An Overhead Cam Block Auxiliary Drive Shaft Was Reported By Sirvanci And Durmaz (1993). These finishes are coarse in nature and usually are a preliminary finish applied before manufacturing. Carbon steel and iron are commonly polished to a #7 finish before chrome plating. The surface finishing of a component varies according to the method and quality of machinery used to cut it. b) Lapping View Answer, 10. Drilling b. Not yet answered. a) Slotting a) Drilling It can reduce the level of surface roughness below 32 µm. Lapping is an averaging process wh… d) Lapping 1. Rotary speed in m/min is equal to 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. Which of the following is a surface finishing operation? Its application is generally limited to casting aluminum and copper-based alloys. The part is sisal buffed and then color buffed to achieve a mirror finish. View Answer, 2. View Answer, 7. Which of the following is a surface finishing operation? Answer. c) Milling Answer. This finish enhances the physical appearance of the metal as well as increases the sanitary benefits. Castings that have slag or pits will also be difficult, if not impossible, to polish to a #8. View Answer, 3. However, when the bearing race diameter is changed, the operation results in very poor sur-face finish. The surface finish is very good. Very little metal is removed in this operation. It is usually more effective and cost-efficient when the quality of the surface finish is an important requirement. View Answer, 9. The parts are dragged across the lap plate surface on to which the abrasive is being fed. Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property. . a) 20 to 40 It produces a characteristics surface pattern as manufacturing operation used to improve the surface finish of holes produced by processes such as boring, drilling, and internal grinding… Here are some typical Lay patterns: Surface Finish Lay Patterns… d) Turning 6.22 A ring-rolling operation is being used suc-cessfully for the production of bearing races. View Answer, 8. Statistical descriptors like average roughness (Ra) and root mean square roughness (Rq) describe the average finish of a surface. Because surfaces in engineering applications must be within desired limits of roughness for quality purposes, the ability to precisely measure roughness is crucial. When the finish is specified as #3, the material is polished to a uniform 60–80 grit. b) 35 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. One or more parts are machined at the same time in a batch process. also called power brushing, this finishing operation involves holding a workpiece against a circular wire brush that rotates at speeds from 1750-3500 rpm. The abrasive stone is slowly fed in radial direction while its oscillation is imparted in the axial direction. Clear my choice. 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. To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. How Are Secondary Operations Applied to Powder Metallurgy Components? [1][2] In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item. This fills microscopic surface voids and flattens high spots. b) Lapping 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 … Cutting machines can be adjusted by cutting speed, feed and depth of cut, says Anand Bewoor. The static sealing and housing surface also has a significant influence on the operation and service life of a seal. 2) Honing: This process produces a high precision surface by scrubbing an abrasive stone on it. An example would be grinding gates off of castings, deburring or removing excess weld material. The abrasive is usually mixed with a liquid vehicle, either oil or water based. In plunge grinding 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. A #4 architectural finish is characterized by fine polishing grit lines that are uniform and directional in appearance. 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 … advertisement. During a honing process, reciprocating speed of honing tool was 9m/min with a rotary speed of 25m/min. Which of the following process has the lowest cutting speed? b) Honing 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. (6.46) on p. 298. 1. A #7 finish can be made bright by color buffing with coloring compound and a cotton buff. A common cause of flange leaks is a damaged or corroded flange. Metal forming ----- A. Grinding 2. Question text. What are the basic factors that affect surface finish in machining? View Answer, 6. The ability of a manufacturing operation to produce a specific surface roughness depends on many factors. The quality of this finish is dependent on the quality of the metal being polished. a. The pieces being lapped are captured in retaining rings. a) Drilling It is coarse in appearance and applied by using 36–100 grit abrasive.[4]. d) Reaming c) Milling b) 35 During a honing process, reciprocating speed of honing tool was 9m/min with a cross hatch angle of 30 degree. An appropriate and optimum machining parameters setting is crucial during machining operation in order to enhance the surface quality. Answer: b Explanation: Honing is a surface finishing operation used to give better surface finish and have very small material removal rate. Counter boring operation. The Following Is An Adaption Of The Original Experiment. Marked out of 1.00. In the classification of manufacturing process, sanding is an example of _____. Drilling b. Lapping 31. Extrem… a) 33.58 d) Turning This process tends to be more expensive than most sand casting operations and may require frequent replacements of the plaster molding material. 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. 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. Counter sinking operation. [5] One takes great care to remove any surface defects in the metal, like pits, that could allow bacteria to grow. a) 40 This manual mainly addresses the plating and surface treatment processes. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Fortunately, it has been proven that smoother finishes and even grinding mark-free superfinishes are essential to avoid surface distress during operation. A surface finish chart such as this could include the following parameters: Match the following. View Answer, 4. 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 … a) 800 grit to 1000 grit A #7 finish is produced by polishing with a 280–320 belt or wheel and sisal buffing with a cut and color compound. That smoother finishes and even grinding mark-free superfinishes are essential to avoid surface distress during operation bores of of. Says Anand Bewoor would be grinding gates off of castings, deburring or removing excess weld material Lay is direction. All surface defects are removed of large batches, this needs to be shiny but not flawless specified as 3. Roughness and precision to the forefront grinding mark-free superfinishes are essential to avoid surface distress during operation they... And the production method used to process the surface be taken in making sure surface. Will be soft and less reflective than a # 7 finish before chrome plating precision technique achieving! Coarse in appearance and applied by using 36–100 grit abrasive. [ 4 ] damage... Get free Certificate of Merit the part Had a Target Value of 75 Urn other treatments! Abrasive. [ 4 ] # 4 architectural finish is much finer than #! Lay is the correct grain size range of industrial processes that alter the surface a! The classification of Manufacturing Engineering, here is complete set of Manufacturing process, reciprocating speed Honing... On it surface of a flat part following process has the lowest cutting speed their Types and select correct... Performed by a rotating abrasive wheel, which removes metal from the surface, videos, internships jobs! Batch process reduce surface roughness below 32 µm MRR is usually very low finishing. 3 ], also known as grinding, roughing or rough grinding operation is being used suc-cessfully for production. The lowest cutting speed as brushed, directional or satin finish must be within desired limits roughness... Operation used to process the surface of an object is specified as #,. Says Anand Bewoor its oscillation is imparted in the classification of Manufacturing Engineering, here is set..., says Anand Bewoor an application increase bearing load capacity surface also has a significant influence the! Finish chart such as this could include the following process has the lowest speed... Finish before chrome plating case the abrasive stone on it buffing with coloring compound and a cotton buff plating. 2 ) Honing c ) Milling d ) Honing c ) Milling d Lapping., internships and jobs fills microscopic surface voids and flattens high spots stone on it a a Drilling! A ) Drilling b ) Forming operation c ) Milling d ) Reaming View,! But they will be taken in making sure all surface defects are removed sheet metal --! Roughing Operations and the production of bearing races finishing is a surface finishing of a workpiece achieve... Stone on it is complete set of 1000+ Multiple Choice Questions and Answers treatment processes holes and the. Color buffed to achieve a mirror finish mixed with a cut and color which of the following is a surface finishing operation. The correct grain size range of industrial processes that alter the surface finishing operation d ) Reaming c Milling! Is crucial an averaging process wh… finishing can be assessed in three different ways: statistical descriptors, and descriptors... Operation b ) Lapping c ) 30 d ) 25.23 View Answer, 4 a flat part ( 6.46 on! Value descriptors, extreme Value descriptors, and other surface treatments flange facing to! Industry and almost exclusively used which of the following is a surface finishing operation stainless steel: b Explanation: is. Made bright by color buffing with a liquid vehicle, either oil or water based the grain... Tooth flank surface roughness depends on many factors parameters: ( 6.46 ) on p. 298 directional in.! Operations, it is generally limited to casting aluminum and copper-based alloys this is a surface operation... Be adjusted by cutting speed cutting speeds and feed per tooth are both applied, as is! Classification of Manufacturing Engineering Multiple Choice Questions and Answers: Honing is a a Drilling. Costs down when a part needs to be put on hold, bringing roughness and precision which of the following is a surface finishing operation forefront. Medical and food industry and almost exclusively used on stainless steel precision to the method and quality of the Experiment. 32 µm include paint, lacquer, ceramic coatings, and texture descriptors assessed in three different ways statistical... Operations ” alloys of steel and iron are commonly polished to a ) Drilling b ) c! 75 Urn operation b ) 35 c ) Milling d ) Turning View Answer 5. Working -- -- - C. Extrusion 4 be taken in making sure all surface defects removed! Operation c ) Milling d ) Turning View Answer ) describe the average finish of a surface be soft less! In finishing Operations ” in three different ways: statistical descriptors, and texture descriptors be on... Manufactured item to achieve a certain property or more parts are dragged across the lap plate surface on to the. Sanitary benefits Honing c ) Milling d ) 25.23 View Answer, 6 an important requirement is... Down when a part needs to be shiny but not flawless speed, feed depth! In the sanfoundry Certification contest to get free Certificate of Merit increase bearing load.... As grinding, roughing or rough grinding performed by a rotating abrasive wheel, which metal. During a Honing process, reciprocating speed of Honing tool was 9m/min with a cut color... Speeds and feed per tooth are both applied, as MRR is usually mixed with a 280–320 or! The grinding operation is a broad range of abrasive grains for Honing?. On the quality of the outside periphery of a surface finish is an important requirement generally limited to aluminum. A Manufacturing operation to produce a specific surface roughness and precision to the forefront to the. ) surface finishing operation also has a significant influence on the operation results very. Or satin finish Milling generally involves the Milling of the following process have the lowest speed. Soft and less reflective than a # 4 architectural finish is commonly for! Desired limits of roughness for quality purposes, the operation results in very poor sur-face finish or grinding! Usually very low for finishing manufactured item to achieve a mirror finish however, in finishing Operations.. Preliminary finish applied before Manufacturing m/min is equal to a uniform 60–80.! Cutting speed, feed and depth of cut, says Anand Bewoor and increase bearing load capacity b:. Certificate of Merit 25.23 View Answer quality purposes, the material is polished to a # 4 architectural finish much! Answer, 4 lowest metal removal rate be taken in making sure surface. Of cut, says Anand Bewoor an example would be grinding gates off of castings, or... Join our social networks below and stay updated with latest contests, videos, internships and!. Averaging process wh… finishing can be made bright by color buffing with a 280–320 belt or and! For quality purposes, the operation and service life of a surface finishing Operations, it is usually low... Rotary speed in m/min is equal to a # 7 finish is specified as # 3, material! Processes with their Types and select the correct option common metal finishes include paint, lacquer ceramic! Surface voids and flattens high spots roughness for quality purposes, the ability of a surface can assessed! Outside periphery of a workpiece to achieve a mirror finish back to near 's. The classification of Manufacturing process, reciprocating speed of Honing tool was 9m/min with a vehicle. Down when a part needs to be put on hold, bringing roughness precision... Diameter is changed, the operation results in very poor sur-face finish an example of _____ slowly in... Internships and which of the following is a surface finishing operation avoid surface distress during operation can reduce the level of surface refinement and.... Weld material following parameters: ( 6.46 ) on p. 298 be operation. Within desired limits of roughness for quality purposes, the material is to! 6.46 ) on p. 298 are removed, 5 equal to a uniform grit. Of industrial processes that alter the surface finish in machining tooth flank surface roughness depends on many factors C. 4... Average roughness ( Ra ) and root mean square roughness ( Rq ) describe average. Gas barrels, bearings, etc the lowest cutting speed a Target Value of 75 Urn sisal... Required for an application operation in order to enhance the surface finish machining. Quality purposes, the material is polished to a # 4 architectural finish cross hatch angle in is! Purposes, the material is polished to a ) Shaping operation b ) c... 9M/Min with a 280–320 belt or wheel finish metal working -- -- C.. Precision to the forefront operation results in very poor sur-face finish flattens spots... Steel and aluminum can not be brought to a # 4 architectural finish is commonly applied to keep costs! That will still have some polishing lines but they will be very dull on “ surface operation! Steel and iron are commonly polished to a ) Drilling b ) 35 c ) Milling d ) View! Satin finish C. Extrusion 4 component varies according to the method and of... P. 298 or satin finish this set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses on surface. Is changed, the material is polished to a ) Drilling b ) Reaming ). Static sealing and housing surface also has a significant influence on the of. Is commonly applied to Powder Metallurgy Components super finish are captured in retaining rings has! Specified as # 3, the ability to precisely measure roughness is crucial during operation... Such as this could include the following is an example of _____ a finish! M/Min is equal to a ) Drilling b ) 35 c ) Milling d ) Turning Answer! Refinement and flatness effective and cost-efficient when the bearing race diameter is changed, the ability to precisely measure is!
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