258:, stress-relieved steel preformed shapes are available in a variety of sizes and configurations. Balls, balls with flat spots, ovoids (footballs), diagonally cut wire similar to angle-cut cylinders, ball cones and cones (both of which are different from the general concept of cones) and pins are the most commonly used. Steel media weigh approximately 300 pounds per cubic foot and are expensive for initial installation, but, because of their minimal attrition rate and extreme cleanliness, are being more widely used for light deburring applications and cleaning. Compounds are available to keep steel burnishing media clean and bright for extended periods.
215:-like in nature. Variability in these products occur both with the type of binder used, firing temperatures, the amount, size and type of abrasive grains they contain, and their uniformity of firing. This type of media today is the general workhorse of mass finishing systems and is the type of medium generally used, because of its availability in a variety of shapes and sizes, low cost, and low wear rate.
271:
Fine-grained fused aluminum oxide is generally employed for burnishing and in this respect is unexcelled in many applications with the possible exception of steel. Where some light cutting is required, fine-grained aluminum oxide can develop a better luster on stainless steels and other hard surfaces than can be achieved with steel burnishing media.
85:
Mass finishing processes can be configured as either batch systems, in which batches of workpieces are added, run, and removed before the next batch is run, or as continuous systems, in which the workpieces enter at one end and leave at the other end in the finished state. They may also be sequenced,
160:
A very important function of the medium is to separate parts during the deburring, cutting, surface improving or burnishing operations. The media:parts volume ratio is normally used to control the amount of part-on-part contact which will occur in a vibratory or tumble finishing operation. At low
190:
and are available in a wide variety of shapes and sizes. Aluminum scrubs parts and can work in conjunction with cleaning compounds to clean parts. Since aluminum is fairly nonabrasive it tends to remove surface impurities without affecting the part's surface qualities. Its cost is typically higher
169:
Media have the unique ability to scrub surfaces and physically assist compounds in their cleaning function. Both abrasive and non-abrasive media are effective in this. They can remove organic soils, scale, and other inorganic residues. Media come in a wide range of materials in order to fulfill
270:
aluminum oxide, which is available in a number of grades. The more loosely bound, coarse-grained materials are characterized by fast cut and high depreciation rates. Because of the dark color of fused aluminum oxide, the soil generated by this material is excessive in many applications.
133:
Media which cut can remove burrs and can smooth surfaces. As a carrier of abrasive grain, the large medium pieces effectively increase the impact force of the abrasive on the metal part to be cut, thereby improving the efficiency of the abrasive. Cutting media develop dull,
152:, rather than actually removing the burr. Media selection, therefore, will control the degree of surface luster, making the part bright and shiny or developing a very matte, dull surface characterized by a completely random scratch pattern, or anything in between.
66:. Both involve the use of a cyclical action to create grinding contact between surfaces. Sometimes the workpieces are finished against each other; however, usually a finishing medium is used. Mass finishing can be performed dry or wet; wet processes have liquid
304:
These are used for drying applications because of the natural ability of these materials to absorb water from metal surfaces. These can also be blended with abrasives and used for fine-polishing applications in vibratory, barrel, or spindle finishing
86:
which involves running the workpieces through multiple different mass finishing processes; usually, the finish becomes progressively finer. Due to the random action of the processes, mass finishing is as much an art as it is a science.
295:
and other naturally occurring abrasive materials are also used in vibratory and tumble finishing applications. In general, these media are not very efficient in vibratory equipment because of their high attrition
148:
Some grades of medium are designed to promote luster on the surface of metal parts. These products are generally non-abrasive or have a very low degree of abrasiveness. They deburr by
340:
These compounds are mainly designed to suspend the small particles created when deburring and abrading parts. They are also designed to keep workpieces clean and inhibit corrosion.
333:. They may be liquids or dry powders. They are usually broken up into four types: deburring and finishing, burnishing, cleaning, and water stabilizing.
243:
resins are employed as the binder and the various shapes are produced by casting. Resin bonded media is good for preparing a metal surface for
203:
Ceramic media are manufactured by mixing clay-like materials and water with abrasives, forming the mud into shapes, drying the shapes, and
360:
designed to remove soil, grease, or oil from the incoming parts. They also provide corrosion resistance for ferrous and non-ferrous parts.
433:
227:-bonded media utilize a wider range of abrasive types and sizes than preformed ceramics. The most popular grades are those using
329:
Compounds are added to mass finishing processes to assist in deburring, burnishing, cutting, cleaning, descaling, and inhibiting
320:, and many other solid materials have been used at one time or another in tumble or vibratory finishing for certain applications.
452:
135:
27:
346:
Burnishing compounds are designed to enhance brightness and to develop certain colors after mass finishing.
161:
ratios, considerable part-on-part contact occurs, while at higher ratios part-on-part contact is limited.
457:
39:
143:
111:
63:
31:
429:
313:
100:
59:
292:
236:
384:"Mass Finishing Handbook" by LaRoux Gillespie, Society of Manufacturing Engineers, 2007
367:
232:
204:
79:
51:
446:
255:
23:
35:
370:
and level of metal ions. This helps ensure consistent results from batch to batch.
74:, while dry processes do not. Cycle times can be as short as 10 minutes for
317:
75:
330:
288:
240:
212:
183:
67:
43:
71:
55:
280:
267:
244:
208:
192:
187:
149:
284:
228:
26:
processes that allow large quantities of parts to be simultaneously
366:
These are used in conjunction with water to maintain a consistent
224:
357:
353:
47:
424:
Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003),
239:
and other abrasives are also used. Usually, low-cost
54:, prepare parts for further finishing, or break off
301:Cobmeal, walnut-shell flour, and related materials
58:runners. The two main types of mass finishing are
191:than other cast media. Wear rates are lower than
394:
392:
8:
406:
404:
266:The most popular synthetic random media is
30:. The goal of this type of finishing is to
78:workpieces or as long as 2 hours for
426:Materials and Processes in Manufacturing
388:
211:the binder. Many of these binders are
62:, also known as barrel finishing, and
7:
126:Media are designed for four things:
352:These compounds are usually dilute
14:
16:Group of manufacturing processes
1:
263:Synthetic random-shaped media
207:them at high temperatures to
220:Preformed resin-bonded media
195:but higher than steel media.
276:Natural random-shaped media
474:
109:
98:
428:(9th ed.), Wiley,
337:Deburring and finishing
200:Preformed ceramic media
398:Degarmo, pp. 781–784.
453:Industrial processes
186:media are typically
50:, polish, brighten,
112:Vibratory finishing
106:Vibratory finishing
64:vibratory finishing
122:Functions of Media
363:Water stabilizers
231:as an abrasive.
166:Surface scrubbing
38:, clean, radius,
465:
438:
411:
410:Degarmo, p. 784.
408:
399:
396:
101:Tumble finishing
95:Tumble finishing
60:tumble finishing
473:
472:
468:
467:
466:
464:
463:
462:
443:
442:
436:
423:
420:
415:
414:
409:
402:
397:
390:
382:
377:
327:
237:silicon carbide
177:
157:Part separation
124:
119:
114:
108:
103:
97:
92:
70:, cleaners, or
17:
12:
11:
5:
471:
469:
461:
460:
455:
445:
444:
441:
440:
434:
419:
416:
413:
412:
400:
387:
386:
381:
378:
376:
373:
372:
371:
368:water hardness
364:
361:
350:
347:
344:
341:
338:
326:
323:
322:
321:
311:
307:
306:
302:
298:
297:
277:
273:
272:
264:
260:
259:
253:
249:
248:
233:Aluminum oxide
221:
217:
216:
201:
197:
196:
181:
180:Aluminum media
176:
175:Types of Media
173:
172:
171:
170:various needs.
167:
163:
162:
158:
154:
153:
146:
140:
139:
131:
123:
120:
118:
115:
110:Main article:
107:
104:
99:Main article:
96:
93:
91:
88:
80:hardened steel
52:surface harden
22:is a group of
20:Mass finishing
15:
13:
10:
9:
6:
4:
3:
2:
470:
459:
456:
454:
451:
450:
448:
437:
435:0-471-65653-4
431:
427:
422:
421:
417:
407:
405:
401:
395:
393:
389:
385:
379:
374:
369:
365:
362:
359:
355:
351:
348:
345:
342:
339:
336:
335:
334:
332:
324:
319:
315:
312:
309:
308:
303:
300:
299:
294:
290:
286:
282:
278:
275:
274:
269:
265:
262:
261:
257:
256:Case hardened
254:
251:
250:
246:
242:
238:
234:
230:
226:
222:
219:
218:
214:
210:
206:
202:
199:
198:
194:
189:
185:
182:
179:
178:
174:
168:
165:
164:
159:
156:
155:
151:
147:
145:
142:
141:
137:
132:
129:
128:
127:
121:
116:
113:
105:
102:
94:
89:
87:
83:
81:
77:
73:
69:
65:
61:
57:
53:
49:
45:
41:
37:
33:
29:
25:
24:manufacturing
21:
458:Metalworking
425:
418:Bibliography
383:
328:
318:carpet tacks
279:River rock,
125:
84:
19:
18:
316:, leather,
223:Plastic or
447:Categories
375:References
343:Burnishing
305:equipment.
188:cast parts
76:nonferrous
68:lubricants
331:corrosion
325:Compounds
314:Shoe pegs
289:limestone
241:polyester
213:porcelain
184:Aluminium
138:surfaces.
72:abrasives
46:, remove
349:Cleaning
56:die cast
40:de-flash
28:finished
281:granite
245:plating
209:vitrify
193:ceramic
150:peening
44:descale
32:burnish
432:
296:rates.
285:quartz
229:quartz
205:firing
144:Luster
36:deburr
380:Notes
358:soaps
354:acids
310:Other
293:emery
268:fused
252:Steel
225:resin
136:matte
117:Media
90:Types
430:ISBN
48:rust
356:or
130:Cut
449::
403:^
391:^
291:,
287:,
283:,
235:,
82:.
42:,
34:,
439:.
247:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.