ball mill liner china mainland cast forged

forged grinding ball sourcing, purchasing, procurement agent & service from china forged grinding ball manufacutuers / suppliers

forged grinding ball sourcing, purchasing, procurement agent & service from china forged grinding ball manufacutuers / suppliers

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china mill liners manufacturers and suppliers - mill liners factory - wuxi orient - page 3

china mill liners manufacturers and suppliers - mill liners factory - wuxi orient - page 3

Contact NowAlloyed Iron Casting Mill LinerAlloyed iron casting mill liner Introduction Superior performance of Cr-Mo alloy steel It has good strength toughness and wear resistance High temperature resistanceHydrogen corrosion resistance,antioxidant,Good thermal strength The application field is very broad .Martensite is obtained by...

Contact NowAlloy Steel Cement Liner PlateAlloy steel cement liner plate Introduction The super wear resistant liner of hopper has the characteristics of super abrasion resistance ratio and high impact resistance ratio. Product details Place of Origin: Jiangsu, China (Mainland) Brand Name: Chen's Liner Model Number: DF642...

Contact NowSteel Casting Ball Mill LinersSteel casting ball mill liners Introduction High wear resistant, high chromium cast iron cement corrugated lining plate refers to the wear-resistant steel plate by cutting, bending deformation, drilling and welding and other production processes, used for transportation and mining equipment wear...

Contact NowCement Mill Boltless LinersCement mill boltless liners Introduction The bolt less lining plate is assembled by riveting plate rivetingThe lining plate and the riveting plate are mutually buckled by the layering and the pinch plate matched with the edge shapeThe material of non bolt lining is high strength High wear...

Contact NowCoal Mill Boltless Mill LinersCoal Mill Boltless Mill Liners Introduction The bolt less lining plate is assembled by riveting plate rivetingThe lining plate and the riveting plate are mutually buckled by the layering and the pinch plate matched with the edge shape Production Process Our Service 1. Production of qualified...

Contact NowSteel Castings For Cement MillSteel castings for cement mill Introduction The material is repeatedly crushed and ground. The selection of liner material has a great influence on the performance of ball mill. High chromium cast iron is the abbreviation of high chromium white wear-resistant cast iron. It is an important branch...

Contact NowWear Abrasion Resistant LinerWear abrasion resistant Liner Introduction High wear resistant, high chromium cast iron cement corrugated lining plate refers to the wear-resistant steel plate by cutting, bending deformation, drilling and welding and other production processes, used for transportation and mining equipment wear...

Contact NowAlloy Steel Wear Resistant CastingsAlloy Steel Wear resistant Castings Introduction The Chute Linings capacity of our company is 30,000MT/year and the single piece is from 15kg to 20tons. The capacities of Mid-frequency induction electric furnaces are 15tons,12tons, 5tons,2tons, 1.5tons and 1.2tons. And we have 10 sets of...

Contact NowResistant Liner For Mill MachineResistant liner for mill machine Introduction The ball mill liner plays a huge role in the cement industry now,it is very helpful for us to improve work efficiency and skill level.The configuration of the liner of ball mill is of great significance to the ball mill. Product details Place of...

Contact NowCr Mo Alloy Steel Cement Mill LinersCr Mo Alloy Steel Cement Mill Liners Introduction The Chute Linings capacity of our company is 30,000MT/year and the single piece is from 15kg to 20tons. The capacities of Mid-frequency induction electric furnaces are 15tons,12tons, 5tons,2tons, 1.5tons and 1.2tons. And we have 10 sets of...

Contact NowWhite Iron Cement Mill Groove LinersWhite Iron Cement Mill Groove Liners Introduction High chromium cast iron is generally referred to as alloy white cast iron with Cr content between 11-30% and C content of 2.0-3.6%. It is a kind of anti-wear material with good performance and special attention. It has good resistance to high...

Contact NowHigh Cr Cement Mill Liner CastingsHigh Cr Cement Mill Liner Castings Introduction High chromium cast iron BTMCR26 is a kind of abrasion resistant material with good performance and special attention. It has much higher wear resistance than alloy steel, and much higher toughness and strength than ordinary white cast iron. At the...

ball mill liner design

ball mill liner design

There are many different designs and styles of ball mill liners. As with grinding balls local economics and ultimately operating costs determine the best design and material to use. The initial set of liners is rarely the final design selected. Based upon individual experience, mill superintendents develop preferences for liner designs. The following is given as a guideline for the initial set of liners.

For 60 mm (2.5) and smaller top size balls for cast metal liners use double wave liners with the number of lifters to the circle approximately 13.1 D in meters (for D in feet, divide 13.1 D by 3.3). Wave height above the liners from1.5 to 2 times the liner thickness. Rubber liners of the integral molded design follow the cast metal design. If using the replaceable lifter bar design in either metal or rubber the number of lifters should be about 3.3 D in meters (for D in feet* divide 3.3 D by 3.3) with the lifter height above the liners about twice the liner thickness. The use of double wave liners, particularly when using 50 mm (2) or larger balls, may show a loss of 5% or so in the mill power draw until the waves wear in and the balls cannest between the lifters.

When liners, and double wave liners in particular, wear with circumferential grooves, slipping of the charge is indicated, and this warns of accelerated wear. When the top size ball is smaller than 50mm (2.5) and mill speed is less than 72% of critical wear resistant cast irons can be used. For other conditions alloyed cast steel is recommended.Rubber liners are well suited to this same area and not onlyreduce operating costs but can reduce noise levels.

Single wave liners are recommended for larger size balls (50mm/2.5 and larger). The number of the lifters to the circle equals approximately 6.6 D in meters (for D in feet, divide 6.6 D by 3.3). The liners are from 50 to 65 mm thick (2 to 2.5) with the waves from 60 to 75 mm (2.5 to 3) above the liners. The replaceable lifter bar design madeof either metal or rubber in about the same design proportions can be used. There could be a loss in power with rubber particularly if the mill speed is faster than about 72% of critical speed, and the ball size is larger than 75 mm. Because of the impacting from the large balls, single wave liners for ball mills are usually made from alloyed steels or special wear-resistant alloyed cast irons. Because of the difficulty of balancing growth and wear with work hardening manganese steel is used infrequently and then with extreme care to allow for growth.

When a grate discharge is used the grates and wear platesare normally perpendicular to the mill axis while the discharge pans conform to the slope of the mill head. The grates and wear plates are normally made from alloy wear resistant cast steel or rubber. They are ribbed to prevent racing and excessive wear. The dischargers and pans are generally made from either wear resistant cast ironor rubber, or wear resistant fabricated steel.Slot plugging can be a problem in grate discharge mills. Whether the grates are made of metal or rubber the slots should have ample relief tapered toward the discharge side. Total angles 7 to 10 degrees (3.5 to 5 degrees per side) are commonly used. Metal grates often havea small lead-in pocket or recess which can fill in with peened metal rather than have the slot peen shut. With the proper combination of metal internals and rubber surfaces, rubber grates have flexibility that tend to make them self cleaning and yet not fail due to flexing.

Except when using rubber liners, the mill surfaces are covered with a protective rubber or plastic material toprotect the surfaces from pulp racing and corrosion. This is done in wet grinding mills. Since dry grinding mills get hot due to heat from grinding generally rubber liners and rubber materials cannot be used.

Shell liners may be furnished of various materials and of several designs. In each case the material used is the best obtainable, resulting in the lowest cost per ton of ore ground. The liner contours are selected for the specific grinding application and take into consideration liner wear, scrap loss, and mill capacity.

Liners cast of Manganese Steel, Ni-Hard, Chrome-moly, or other similar materials may be of the step type, block type, wave type, or the two-piece plate and lifter construction. These are illustrated on the right. During the past years of building ball Mills various other shapes of liners have been tried, such as the pocket type, spiral liners, etc.; in most cases it is found that these special shapes and designs are not justifiable from the standpoint of economics. They involve additional costs which are not generally recovered from an increased efficiency in milling operation.

Lorain Shell Liners consist of high carbon rolled steel plates accurately formed to the mill shell radius. These are held in place by rolled alloy steel heat treated lift bars. This type liner is carefully engineered for the specific grinding application. Variations in lift bar design and liner plate thickness provide this flexibility of design for application.

All shell liners designed for ball mill operations are of such size and shape that they will easily pass through the manhole opening to facilitate relining operations. In rod mill work the design is such that they will easily pass through the large ball open end discharge trunnion.

Where cast liners are used, and especially in rod mill applications, we furnish rubber shell liner backing to help cushion the impact effect of the media within the mill and prevent pulp racing. With the Lorain type of liner such shell liner backing is not required. For special applications where severe corrosive conditions exist a shell liner of special alloys can be furnished and also the interior surface of the shell can be treated to protect such parts from the corrosive conditions.

Head liners are of the segmental type constructed of Manganese Steel, Chrome molybdenum, or Ni-Hard and are designed to pass easily through the manhole opening or discharge opening in the case of rod mills. For ball mill work ribs are cast with the feed head liners to deflect the ball mass and minimize wear on the headliner itself.

Where cast liners are used shell liner bolts and head liner bolts are made of forged steel with an oval head to prevent turning and loosening within the liners. These are held in place with two hex nuts and a cut washer. For wet grinding applications special waterproof washers can be furnished.

Theeffect of liner design upon mill performance appears to have received little attention. Clearly, the main function of the liner is to form a removable surface to the null body, which may be replaced when seriously worn.

It is also clear however, that the metal plates which serve this purpose may have a surface which ranges from smooth in one which carries an intricate pattern of raised bars or sunken depressions. The merits of the various types do not appear, however, to have been studied.

where smooth liners are those which have projections insufficient to give appreciable keying between the liner and the ball charge, whilst lifter liners are those which are so heavily ribbed as to give rise to appreciable interlocking between the balls and the liners.

Various common types of liners are illustrated in Fig. 6.12. Although these liners have various patterns of projections, or depressions, to give an amount of interaction between the liner and the grinding medium, it would be expected that wear would round the edges. It is doubtful whether, after some time in service, the performance of a mill with these liners differs appreciably from that of a mill with a smooth surface. Liners furnished with heavy lifter bars are also sometimes used and in such a case the locking of the ball charge to the shell must be very effective. Nevertheless, although a few vague general statements to the effect that a lifter mill gives a product with different size characteristics to that of a smooth mill have appeared, the point does not appear to have been widely investigated. It is probable, however, that, on the grounds of differences in the size characteristics of the products, there exists no sound reason for the use of lifters in preference to the normal smooth liners.

It is possible that, when a material with a low coefficient of friction is milled, the charge might slip on a smooth mill shell, with consequent loss of grinding capacity, and in such a case the use of lifter bars might well be the solution. It has also been suggested by one of the authors, Rose, that the use of lifter bars might eliminate the surging of the charge sometimes encountered in mill operation.

An entirely different conception of the duty of the mill liner underlies the design of the studded liner developed by Usines Emile Henricot of Count St. Etienne. These liners, illustrated in Fig. 6.12 and Fig. 6.13, consist of comparatively thin plate liners with uniformly spaced studs on the working surface; these studs being integral with the plate. Provided the spaces between the studs are not allowed to become choked with tramp-iron, etc., the studs furnish a good key between the shell and the charge which, it is claimed, leads to a greater power consumption and to improved grinding. Furthermore it would appear that the studs impose a definite geometrical arrangement in the outer layer of balls which, in turn, brings about a closer packing, throughout the ball mass, than obtains with conventional types of liner. This effect would also lead to improved performance. Evidence of this effect of the studs upon the packing of the charge appears in Fig. 6.13b, for the balls are clearly seen to lie in rows in the mill instead of in completely random array.

An incidental merit claimed for these liners is that the high bearing pressure between the balls and the studs of the liners leads to work hardening of the studs; with a consequential reduction of the rate of metal wear.

The Henricot liners, which have been discussed in a paper by Belwinkel, appear to be the only attempt so far made to influence the grinding characteristics of a mill by means of correctly designed liners. It would therefore appear that there is some room for development in this direction.

differences between cast and forged grinding ball?

differences between cast and forged grinding ball?

The ball mill grindingball on the market now can be divided into two kinds according to the manufacturing process: Cast grindingBall and forged steel ball, but their wear degree is not the same. Due to crushing and pulverizing materials, grindingballs need good abrasion resistance and enough impact toughness, and require steel balls cannot be broken, ball mill grindingballs can be divided into:

1. Quality index of High Chromium grinding balls: Chromium content 10.0%-12.0 %, carbon content between 1.80%-3.20% are called high chromium grinding balls, the national standard requires hardness (HRC) of high chromium grindingballs 58, impact value AK 3.0 j / 2. If the hardness high chromium grindingball must adopt high-temperature quenching + tempering treatment (at present domestic high chromium grindingball quenching oil quenching, wind quenching, water solution, and other quenching methods), if the hardness (HRC) is below 54, then the high chromium grindingball has not been quenched.

2. Ultra-high Chromium grindingBall Quality Index: Chromium contents12.0%-28.0 %, carbon contentsbetween 1.80%-3.30% are all called high chromium grindingball, the national standard requires high chromium grindingball hardness (HRC) must 58, impact value AK 3.0 j / 2.If the hardness of the ultra-high Chromium grindingBall must adopt high-temperature quenching + tempering treatment (at present, there are two quenching methods of oil quenching and wind quenching for ultra-high Chromium grindingBall), if the hardness (HRC) is below 54, the ultra-high chromium grindingball has not been quenched.

3. Medium Chromium grindingBall Quality Index: the chromium content is 3.0-7.0 %, the carbon content is 1.80%-3.20% is called medium chromium grinding ball, the national standard request medium chromium grinding ball hardness (HRC) must 47 above, the impact value AK 2.0 j /cm 2, high-temperature tempering or vibratory stress relief (VSR) is used to improve the quality of grinding balls. If the grinding ball surface dark red indicates that the product has been high-temperature tempering, if the grinding ball surface is still metallic color indicates that the product is not high-temperature tempering.

4. Low Chromium Grinding Balls Quality Index: containing 0.5% ~ 2.5% chromium, containing 1.80% ~ 3.20% carbon are called low chromium grinding balls, national standard requirements low chromium grinding balls hardness (HRC) must 45, impact value AK 1.5 j /2. In order to ensure the quality of grinding ball, low chromium grinding ball should be tempered at high temperature or vibratory stress relief (in order to eliminate casting stress). If the grinding ball surface dark red indicates that the product has been high-temperature tempering, if the grinding ball surface is still metallic color indicates that the product is not high-temperature tempering.

5.Quality Index of forged steel balls: 0.1% ~ 0.5% chromium content (forged steel balls generally do not contain chromium) , carbon content is below 1.0% and steel balls are made of high temperature forging Some forging steel ball surface hardness (HRC) although can reach 56 above (quenching layer only about 15) , because the forging steel ball material hardenability is poor the core hardness is generally only more than 30 degrees. Under normal conditions, water quenching is often used for forging steel balls, so the broken rate of forged steel balls is very high.

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