滚筒式抛丸清理机的总体和结构设计-英文文献

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南昌航空大学科技学院学士学位论文

外文翻译原文

SHOT BLASTING MACHINES FOR THE BLASTING OF

SHEET MILL ROLLS

V. I. Meleshko, A. P. Kachailov, V. G. Boikov,

V. L. Mazur, T. P, Kobka and I. I. Krivolapov

At the present time~ much attention is being devoted to increasing the quality of rolled

products, partieularly sheet. To a significant degree this depends upon the preparation of

the roll surface. Many plants are engaged in improving the quality of working the roll

surface in preparing them for rolling.This article was written by personnel from

Zaporozhstal Plant, Magnetogorsk Metallurgical Combine, the Institute for Ferrous

Metallurgy, Dnepropetrovsk, and Magnetogorsk Mining and Metallurgical Institute on this

very real problem..

The surface microrelief, or roughness, of cold rolled constructional sheet has an influence

on the mechanical and production properties of metal, and also on the finish quality of

parts made from this sheet. The final surface microrelief of thin sheet steel is formed in a

skin pass on work roils which have been given a rough finish with metal shot.

Normally the rough surface finish on the work rolls of skin pass stands is produced in

pneumatic and rotor shot blasting machines. Experience in their use has shownthat the

pneumatic machines used in the country's steel plants do not fill the need for high quality

blasting of roll surfaces.

In 1969 the Institute for Ferrous Metallurgy, Dnepropetrovsk, did work on the SM-2 shot

blasting machine in No. 1 Cold Roiling Mill of Zaprozhstal Plant, which revealed a

number of shortcomings in its construction.

To provide sheet with the surface roughness required by the specifications of Volga

Automobile Plant (R a =0.8-1.6 g),the basic requirements for the design of shot blasting

machines were determined, The machine must provide:

1. a constant shot size during operation, in other words, effective removal of shot of the

specified size from

worn shot;

2. the possibility of controlling air pressure in the collector of the shot blast machine during

stable operations;

南昌航空大学科技学院学士学位论文

3. the handling of work rolls of different diameters (400-500 mm) without special

equipment on the machine;;

4. simplicity in control and convenience in maintenance.

Fig.1

The SM-2 machine (Fig. 1) consists of a stationary closed chamber ! with a trolley on

wheels aad movab!enozzles 2~ which under the action of compressed air discharge shot on

to the roll surface, a worm conveyor 8, an elevator with a separator 4, the shot blast

equipment 5, and an exhaust system 6. The equipment is mounted on a special foundation

1905 mm below the floor level The length of the machine withthe trolley out is 15fl00 ram,

the height 4070 ram, and the width 4600 mr~ The dimensions of the rolls handled are 400-

500 mm in diameter and 2000-4000 mm in length. The total weight of the equipment is 15

tons.

As research has shown, the dynamics of the wear of a working mixture of abrasive and the

original condition of the shot changes during operation. During blasting, the shot takes on a

wider size range and is worn down, forming many fine particles. The conditions under

which the parts are blasted depend upon the size of the shot used. The contamination of the

specified size by fine particles disrupts the process, producing a poor quality surface on the

rolls and consequently on the sheet. To eliminate these problems it is necessary to either

regularly measure the composition of the shot and make appropriate changes in the

blasting sequence, which is difficult to do in practice, or to screen the shot during operation

of the machine to provide the specified particle size.

Stability in the blasting process is also determined by the quantity of shot delivered to the

nozzles. It was experimentally established that supplying 0.3-0.4 kg/sec of shot to the two

nozzles in operating with an air pressure of 2.5-4.0 atm provided stable operation.

Equipping the machine with screening devices is an effective method for maintaining a

constant shot size mix. This is confirmed both by data in the literature and by experience in

the operation of SM-1 and TsKb_P-1 shot blast machines at Zaporozhstal Plant.

The shot is delivered to the surface of the roll by the shot blast equipment, the chamber of

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南昌航空大学科技学院学士学位论文外文翻译原文SHOTBLASTINGMACHINESFORTHEBLASTINGOFSHEETMILLROLLSV.I.Meleshko,A.P.Kachailov,V.G.Boikov,V.L.Mazur,T.P,KobkaandI.I.KrivolapovAtthepresenttime~muchattentionisbeingdevotedtoincreasingthequalityofrolledproducts,partieularlysheet.Toasignificantdegreethisdependsuponthepreparationofth...

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