vitkovice katalog grinding balls en

PERFECTION IN STEEL

AT A GLANCE

PERFECTION IN STEEL VTKOVICE CYLINDERS a.s.

VTKOVICE CYLINDERS a.s. is a major member of VTKOVICE MACHINERY GROUP comprising more than 60 companies with total sales over 1 billion EUR and employing about 8,500 people all over the world.

VTKOVICE CYLINDERS a.s. is a manufacturer of steel grinding balls with a many years tradition.

The grinding balls have been produced since 1938 when the production process based on press forging technology was initiated. In 1961 the product range was extended by rolled grinding balls. The grinding balls are produced by VTKOVICE CYLINDERS a.s. using world-class equipment achieving high quality.

In 1998 the entire production process was reequipped, heat treatment technology (quenching and tempering) was added and the product range was further extended.

GRINDING BALL CLASSIFICATION AND PRODUCTION

The rolled and forged grinding balls are actually offered in the following nominal diameters:

16, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 and 120 mm.

The grinding balls of the diameters above are produced and offered in the following hardness classes:

Hard 59-65 HRC for diameters D16 D50 57-64 HRC for diameters D60 - D70 55-62 HRC for diameters D80 D100 50-60 HRC for diameter D120Medium 42-55 HRC for diameters D16 and moreLow 240-360 HB for diameters D16 and more and approximate chemical composition:

Chemical elements in %C Mn Si P S Cr

0,50 - 2,00 0,50 - 2,00 0,15 - 0,70 max. 0,035 max. 0,035 max. 1,50

The grinding balls are produced of materials which have undergone a long-term development in the company and are continuously advanced to improve the end-use properties and customer satisfaction. The combination of high-quality wear-resistant steel and high grinding ball hardness ensures very low wear values during grinding. The heat treatment process is described in great detail so that each grinding ball is uniformly through-hardened which enables to achieve the best mechanical properties. The achievement of accurate volume hardness values is a matter of course.

In case of special requirements we can offer production and delivery of the grinding balls in other diameters and made of various material grades provided the quantity conditions are met.


INSPECTION OF INPUT MATERIALThe input material for the grinding ball production are round bars which are subject to strict receiving inspection be-fore their entry into the production process. Identication of each bundle is a precondition which must be met in any case.

HEATING OF INPUT MATERIAL The input material is heated in an advanced walking beam furnace which ensures accurate output temperature of the bars. The temperature is one of the most important factors inuencing the nal grinding ball hardness in direct heat treatment from the rolling temperature

ROLLING OF GRINDING BALLSTwo rolling mills for the grinding ball processing are avail-able. Grinding balls of 16, 20, 25, 30, 35, 40 and 50 mm diameters are rolled on the smaller one and grinding balls of 60, 70, 80, 90 and 100 mm diameters are rolled on the larger one. Reworking and improvement of the tools ap-plied enables to achieve very high surface quality of the grinding balls processed on the two rolling mills.

GRINDING BALL PRODUCTION PROCESS


HEAT TREATMENTThe grinding balls are heat treated in an advanced furnace linked with a high-capacity quenching tank to achieve the required hardness. The heat treatment know-how elabo-rated in detail secures the achievement of high hardness, or accurate hardness range required by the customer.

GRINDING BALL INSPECTIONSpecied number of grinding balls is withdrawn from each production lot during the production process. Each of the withdrawn grinding balls is then subject to thorough meas-urement of surface and volume hardness. Metalographic structure of the material of cut-up grinding balls is also ana-lyzed using etching.

GRINDING BALL PACKINGThe grinding balls are packed as required by the customers. We offer packing in steel barrels on pallets or without pal-lets, in high-volume bags of 1 ton bearing capacity. We also offer grinding balls in bulk. The services provided by the company include the arrangement of grinding ball trans-port by truck, railway wagon or in containers.


PASSION FOR QUALITY

TECHNOLOGICAL ROUTE OF GRINDING BALL PRODUCTION

REFERENCESThe grinding balls manufactured by VTKOVICE CYLINDERS a.s. satisfy the requirements of local as well as foreign cus-tomers from almost all over the world. The grinding balls are suitable for all applications in both wet and dry grinding. The typical application spheres include:

1. Mining industry grinding of ores (iron, manganese, chromium, wolfram, molybdenum, copper, zinc, gold, uranium)2. Building industry grinding of sand and raw materials for cement (limestone) production3. Energy and Heat industry grinding of coal, blast furnace slag, etc.4. Other grinding of colour pigments, ceramic materials, etc.

CERTIFICATIONVTKOVICE CYLINDERS a.s. is a holder of ISO 9001:2008, SN EN ISO 14001:2005 and SN OHSAS 18001:2008 cer-ti cates. The system ceti cation and especially consistent adherence to the quality system is a guarantee of high product quality. Certi cate to SN EN 10204 3.1 attesting the quality is issued for every grinding ball delivery.

Rolling Hardness testingIncoming inspection gnitroSnoitcepsnilausiVHeating

Packing Expedition

Storing

Hardening Hardness testingHeating Packing ExpeditionStoring Sorting


TECHNICAL SPECIFICATIONS

BASIC GRINDING BALL DATA

Diameter[mm]

Weight[kg/pc]

Surface[cm2]

Ball/t[n/t (pc)]

Ball/m3

[n/m3 (pc)]Weight/m3

[kg/m3]Ball surface/m3

[cm2 x 10-4/m3]

16 0,017 8,04 59 398 279 868 4514 225,01

20 0,330 12,57 30 409 137 276 4514 172,56

25 0,064 19,64 15 569 70 284 4514 138,04

30 0,111 28,27 9 010 40 673 4514 114,98

35 0,176 38,48 5 674 25 312 4514 97,40

40 0,264 50,27 3 802 17 159 4514 86,26

50 0,514 78,54 1 949 8 785 4514 69,00

60 0,888 113,10 1 126 5 084 4514 57,50

70 1,410 153,94 709 3 202 4514 49,29

80 2,105 201,06 475 2 145 4514 43,13

90 2,999 254,47 333 1 505 4514 38,30

100 4,111 314,16 243 1 098 4514 34,49

120 8,029 490,87 124 562 4514 27,59

VOLUME HARDNESS CALCULATION

Number of ball zone

[ i ]

Volume of ball zone[ % ]

Hardness of ball zone[ HV ]

Volume of ball zonex

hardness of ball zone[ % x HRC ]

1 27,1 A 0,271A

2 21,7 B 0,217B

3 16,9 C 0,169C

4 12,7 D 0,127D

5 9,1 E 0,091E

6 6,1 F 0,061F

7 3,7 G 0,037G

8 1,9 H 0,019H

9 0,7 I 0,007I

10 0,1 J 0,001J

Volume hardness

12345678910

HARDNESS CONVERSION TABLE

Rockwell C [HRC]

Brinell [HB] Vickers [HV]

66 - 865

65 739 832

64 722 800

63 705 772

62 688 746

61 670 720

60 654 697

59 634 674

58 615 653

57 595 633

56 577 613

55 560 595

54 543 577

53 525 560

52 512 544

51 496 528

50 481 513

49 469 498

48 455 484

47 443 471

46 432 458

Rockwell C [HRC]

Brinell [HB] Vickers [HV]

45 421 446

44 409 434

43 400 423

42 390 412

41 381 402

40 371 392

39 362 382

38 353 372

37 344 363

36 336 354

35 327 345

34 319 336

33 311 327

32 301 318

31 294 310

30 286 302

29 279 294

28 271 286

27 264 279

26 258 272

25 253 266

!

RADIAL SECTION OF GRINDING BALL


HV

Your contact:

GLOBAL PRESENCE

HEADQUARTERSVTKOVICE CYLINDERS a.s.Rusk 24/83 706 00 Ostrava-VtkoviceCzech Republicwww.vitkovicecylinders.czTel: +420 596 664 608/601Fax: +420 596 664 703E-mail: [email protected]

CROATIALahvarna Brod d. o. o.Vladimira Filakovca 335 000 Slavonski BrodRepublic of CroatiaTel.: +38 535 491 572Fax: +38 535 491 573E-mail: [email protected]

GERMANYVITKOVICE Kordt und Rosch GmbHGrafweg 1258840 PlettenbergNordrhein-WestfalenGermanyTel.: +49 2391 9098 43Fax: +49 2391 9098 49E-mail: [email protected]

www.vitkovicecylinders.cz

INDIAVITKOVICE INDIA POWER Pvt. Ltd. Ground Floor, Block F, International Trade Tower, Nehru Place110019 New DelhiIndiaTel.: +911 140 574 795Fax: +911 140 574 796E-mail: [email protected]

RUSSIAVITKOVICE, a. s. Moscow Branch Office 4-ya Tverskaya -Yamskaya d.33/39125047 MoscowRussian FederationTel.: +74 957 999 320Fax: +74 957 999 364E-mail: [email protected]

CHINAVITKOVICE, a. s. Beijing Representative Office Rm. 22-1A, CITIC BuildingNo. 19 JianguomenwaiChaoyang District100004 BeijingChinaTel.: +86 10 65 003 477Fax: +86 10 65 227 909E-mail: [email protected]

SLOVAKIAVTKOVICE SLOVAKIA a. s.Zmonick . 13811 03 BratislavaSlovak RepublicTel.: +421 254 432 305Fax: +421 556 834 184E-mail: [email protected]

UAE VTKOVICE GENERAL TRADING LLCCorniche RoadP. O. BOX 41913Abu DhabiUnited Arab EmiratesTel.: +971 2 6270088Fax: +971 2 6270087E-mail: [email protected]

POLANDVTKOVICE MILMET S. A.Ul. gen. Grota Roweckiego 13041-200 SosnowiecPolandTel.: +48 322 990 303Fax: +48 322 914 358E-mail: [email protected]

ARGENTINAVTKOVICE CYLINDERS a.s., Buenos Aires Representative OfficeAv. San Martn 64451419 Buenos AiresArgentinaTel.: +54 11 4571 7111Fax: +54 11 4571 7111E-mail: [email protected]

TURKEYVTKOVICE a.s. Ankara Representative OfficeEhlibeyt Mah. Ceyhun Atf Kansu Cad. AtaPlaza 10. Kat No: 100/31Balgat ankaya/AnkaraTurkeyTel: +90 312 473 5751E-mail: [email protected]

vitkovice katalog grinding balls en

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