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