mechancal vertical grinding

vertical roller mill parts

vertical roller mill parts

Based in Germany, our company has experience of many years for providing products and solutions in High Chromium Cast Iron and Composite Metal Ceramic for achieving better lifetime. Continuous research and development have helped us to offer products and solutions to our customers for improved lifetime and efficiency.

The vertical roller mill (VRM) is popular and widely used for grinding of coal and raw materials. The vertical mill is energy efficient with low specific wear rate. Vertical mill supports drying of the feed material, grinding, separating, and material transport inside the mill. Vertical mill gives optimum grinding performance when grinding rollers and tables are in good condition, properly aligned and preloaded.

Rollers tyres and tables are main grinding elements in the vertical mill. As the grinding elements wear, the grinding efficiency of the vertical mill declines. We are providing wear parts that can withstand and perform best in the most abrasive conditions and materials.

We supply grinding rollers tyres and segments for all types of vertical grinding mills from different manufacturers. We are supplying wear parts in high chromium alloy and composite metal ceramic. We have the ability to produce and supply superior quality tyres and wear segments that provide excellent fit, top performance and exceptionally long life. Our years of experience has enabled us to supply Tyres and Tables in superior casted material which ensure slower and uniform wear during operation, thus it effectively reduce the mill vibration and increase the grinding efficiency.

We provide complete roller assembly for all types of vertical mills. The roller is delivered in assembled form. We use best European origin seals and bearings to ensure smooth operation.

We also supply welding wires and hardfacing assistance for rebuilding of wear parts along with wear plate, chromium carbide and ceramic cladded plate, and wear block product for vertical mills.

We provide wear parts in high-chromium alloy and metal ceramic composite. Wear parts are casted from high chromium alloy irons and fully heat treated for optimum mechanical properties. High Chrome Alloys which we believe offer excellent value in service with the added advantage of being able to accept hard facing at a later stage in their life. All parts are carefully engineered to withstand abrasive wear and improve efficiency by reducing your cost per ton of material processed. The use of High Chrome increases the wear life versus low and medium chrome alloys. All parts are produced under strict quality control. We establish and implement GB / T19001-2008-ISO9001: 2008 standard quality management system.

We are among few suppliers of wear resistant material in composite metal ceramic. Composite metal ceramic has high toughness and better high wear resistance feature. Metal matrix composite is composed with alloy and ceramic through special casting, heat treatment process which gives 2-3 times better life than traditional high chromium alloys. The ceramic particles are placed on the surface of high chrome material layer to form the ceramic metal composite material layer. Composite metal ceramic has both features of high wear resistance of ceramics as well as good mechanical properties of metal materials, therefore it does not easy wear. This strengthen structure increases the surface friction and effective grinding area and help to improve the grinding efficiency and reduces the power consumption.

If required, we are able to send our engineers and sales staff to examine and draft your vertical mill wear parts at your plant. We are also capable to customize the wear parts as per customer requests for improved performance. We can easily deal with the changes in design, metallurgy, heat treatment and machining. With the improved metallurgy and heat treatment, our products have proven better life than other suppliers. All our supplied parts are guaranteed for proper fit, performance and customer satisfaction.

We supply replacement wear part castings for abrasive and high wear applications in cement, mining and power industry worldwide. Our supplied parts meet the expectations of industrial operations like crushing, grinding, and shredding.

internal grinder, vertical grinder, cylindrical grinder suppliers, manufacturers, factory - palmary

internal grinder, vertical grinder, cylindrical grinder suppliers, manufacturers, factory - palmary

As a leading manufacturer of grinders in the world, we customize cutting edge grinders for our clients worldwide at reasonable cost.Provide your best grinding solutionValue up you production efficiencyYour grinding consultantPrecision / Perfection / Excellence

vertical grinding has advantages |

 modern machine shop

vertical grinding has advantages | modern machine shop

In vertical grinding,the workpiece is heldupright in a rotary chuck with the grinding spindle overhead. Thisconfigurationcan improve roundness, facilitate single-setup processing and prolong the life of the machine. Loading and unloading may gets easier, too. Workpieces with relatively large diameters and short lengths benefit the most from vertical grinding.

Think of a conventional grinder turned on its side and you get a picture of what vertical grinding represents. The axis movement and spindle rotation indicated in these two illustrations clarifies the unusual orientation.

By now, we are used to machine tool configurations that break from the normal and the conventional. Each new way of arranging axes or orienting the cutting tool and workpiece causes us to rethink the basics of metalcutting and to discover new options for producing parts more efficiently.

Vertical grinding is certainly a case in point. Vertical grinding, as the name implies, fixtures the workpiece on a rotary chuck in the base of the machine, similar to the workpiece orientation on a vertical lathe. The grinding spindle travels up and down and side to side (and may also swivel) from above the workpiece.

In recent years, one of the main proponents of vertical grinding has been Taiyo Koki, a builder of grinding machines headquartered in Nagaoka, Japan. The company is now a unit of Mori Seiki and as such, it has been taking a more active position in the North American market for grinders.

Taiyo Koki manufactures many types of grinders but is noted for its numerous models based on the principles of vertical grinding. The distinguishing characteristic of these grinders from a structural standpoint is that both the grinding spindle and the workpiece are installed vertically, rather than horizontally, for grinding the ID, OD and face of cylindrical part features. The grinding wheelhead is controlled simultaneously in the horizontal axis (the direction of the workpiece diameter) and the vertical axis (the longitudinal direction of the workpiece). The strength of these machines is in grinding round shapes.

On a vertical grinder, the workpiece sits upright in the chuck. On a horizontal grinder, clamping force is required to keep the workpiece from falling out of the chuck. A vertically clamped workpiece requires only enough clamping force to resist grinding forces. Gravity works in favor of, not against, the grinding process.

Because fixturing on a vertical grinder requires less clamping force, there is likely to be less distortion of the workpiece. This reduces the chances of roundness error. According to the builder, vertical grinding can achieve a roundness error of less than micrometer (less than 0.000039 inch) based on the results derived from standard test workpieces.

A vertical grinder can do OD, ID and face grinding. Depending on the shape of the workpiece, all three can be applied in a single chucking. When this is possible, it avoids error caused by multiple chuckings. Circularity between the ID and OD and squareness of the ID and OD to the face can be maintained more accurately. Because the workpiece and the grinding spindle are vertical, there is virtually no sag to contend with. The structure of the machine is inherently rigid.

A vertical grinder can be easier to load and unload. Manual loading and unloading do not require supporting the workpiece while activating the chuck. The operator simply sets the workpiece down inside the chuck. Centering the workpiece also occurs more naturally because there is no uneven force of gravity as the jaws close.

Loading and unloading with a hoist or robot may also be simpler because the workpiece in the chuck can have the same stable orientation it has on the carrousel or transport tray. For example, a disk-shaped part such as a gear can be delivered flat down to be picked up for loading. It is likewise placed flat down in the chuck of the grinder.

Vertical grinders are also generally more compact than comparable horizontal grinders. Vertical grinders take up more air space than floor space. This leaves room for automatic loaders or a robot on the side of the machine, making automation a more attractive option.

On a horizontal grinder, the sliding surfaces of the X and Z axes are lower than the point of grinding action. As configured on the Taiyo Koki machines, a vertical grinder positions the sliding ways of these axes above the grinding action. Grinding dust does not fall onto these moving surfaces. This reduces wear and prolongs the life of the machine while preserving its accuracy.

From this discussion, it is clear that workpieces with relatively large diameters and short lengths benefit the most from vertical grinding. Many automotive parts have geometries that lend themselves to vertical grinding. Automotive parts are the most common applications for vertical grinders. A typical non-automotive application is the vertical grinding of spindle housings for machine tools. Such workpieces can be processed efficiently on larger models of vertical grinders.

The application also dictates what type of vertical grinder is most appropriate. Models with the grinding spindle locked in a vertical position work best where optimum results for ID grinding are critical. This configuration is suitable for face grinding in addition to ID grinding. According to the builder, this is the most popular style of vertical grinder.

Models with the grinding spindle fixed at a 30-degree angle for use with angular grinding wheels work best where optimum results for OD grinding are critical. Face grinding is also feasible on these models.

Models with turret-mounted grinding spindles are the most flexible and the best suited for optimum results in single-setup processing. These models can automatically switch the grinding angle to do ID, OD and face grinding on the same machine. Typically, the turret is equipped with one ID and one OD wheelhead. Another option is to equip the turret with two ID heads or two ID heads and one OD head.

Automatic tool changing is available for certain models with vertically fixed grinding spindles. The spindle moves in the X and Z axes to access drop-off and pick-up stations protected by a door that automatically opens and closes. This system allows grinding tools to be exchanged, adding to the flexibility and productivity of the vertical grinding process.

Achieving consistent and quality results from the centerless grinding process requires an understanding of the basic fundamentals. Most application problems associated with centerless grinding derive from a misunderstanding of the basics. This article explains why the centerless process works and how to use it most effectively in your shop.

Optimizing a camshaft lobe grinding cycle has traditionally been based less on science and more on educated guesswork and numerous test grinds. Now, computer thermal modeling software can predict areas where lobe burning is likely to occur, in order to determine the fastest possible work speed that won't thermally damage lobes and greatly reduce the number of requisite test grinds.

application of self-inhaling internal cooling wheel in vertical surface grinding | chinese journal of mechanical engineering | full text

application of self-inhaling internal cooling wheel in vertical surface grinding | chinese journal of mechanical engineering | full text

There is less research on vertical sculptured grinding technology. Especially in high vertical surface grinding process with the cup abrasive wheel, the thermal damage is prone to happen and undermine the grinding surface integrity. This problem limits to improve the grinding efficiency and the grinding ratio greatly. Through the analysis of vertical surface grinding process and features in depth, this paper revealed the inherent mechanism of higher grinding temperature in the process of vertical sculptured grinding using the cup wheel. Based on the previous research achievements, the grinding experiments on TC4 (Ti-6Al-4V) and GH4169 are carried out utilizing the self-inhaling internal cooling wheel. The experimental results show that the self-inhaling internal cooling wheel can efficiently reduce the grinding surface temperature. Moreover, the inherent mechanism of reducing the grinding temperature using the internal cooling method is revealed. Meanwhile, under the same grinding conditions, the grinding ratio during the experiments on GH4169 using self-inhaling internal cooling method is about 3 times as high as using conventional external cooling method. And the grinding forces can be reduced by about 20%. This research revealed the inherent mechanism of higher grinding temperature in the process of vertical sculptured grinding using the cup wheel, which provides theoretical basis for the design and application of self-inhaling internal cooling wheel. At the same time, an efficient and non-invasive surface grinding method of TC4 and GH4169 is presented.

JIN T, STEPHENSON D J, CORBETT J. Burn threshold of high-carbon steel in high-efficiency deep grinding[J]. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2002, 216(3): 357364.

DING W F, XU J H, CHEN Z Z, et al. Grindability and surface integrity of cast nickel-based superalloy in creep feed grinding with brazed CBN abrasive wheels[J]. Chinese Journal of Aeronautics, 2010, 23(4): 501510.

MONICI R D, BIANCHI E C, CATAI R E, et al. Analysis of the different forms of application and types of cutting fluid used in plunge cylindrical grinding using conventional and super abrasive CBN grinding wheels[J]. International Journal of Machine Tools & Manufacture, 2006, 46(2): 122131.

XU X P, HUANG H. Study on creep feed grinding of superalloy K417 for vanes used in aeronautical industry by utilizing intermittent CBN wheel[J]. Acta Aeronautica et Astronautica Sinica, 1997, 3(18): 316323. (in Chinese)

LI Xun, born in 1980, received his BS and PhD degrees from Beihang University, China, in 2002 and 2007, respectively, and then did his post-doctoral research on grinding in 2008. His main research interest is processing technology of difficult-to-cut materials.

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mechanics of vertical surface grinding - sciencedirect

mechanics of vertical surface grinding - sciencedirect

In the present work, the mechanics of chip formation and the wheel-wear phenomenon in vertical surface grinding have been investigated and the performance of the grinding wheel has been evaluated in terms of specific power, specific energy, co-efficient of grinding and grinding ration. Experiments indicate that a self-dressing action of the wheel, due predominantly to fracture at the bond posts, accounts for 7075% of the wear volume. Results also show that the grinding ration (G) is related to the material removal rate (M) by an equation of the form G = K(M)n, where K and n are constants.

types of grinding machines - learnmech

types of grinding machines - learnmech

Grinding Machines are also regarded as machine tools. A distinguishing feature of grinding machines is the rotating abrasive tool. Grinding machine is employed to obtain high accuracy along with very high class of surface finish on the workpiece.

However, advent of new generation of grinding wheels and grinding machines, characterised by their rigidity, power and speed enables one to go for high efficiency deep grinding (often called as abrasive milling) of not only hardened material but also ductile materials.

Tool grinding may be divided into two subgroups: tool manufacturing and tool resharpening. There are many types of tool and cutter grinding machine to meet these requirements. Simple single point tools are occasionally sharpened by hand on bench or pedestal grinder. However, tools and cutters with complex geometry like milling cutter, drills, reamers and hobs require sophisticated grinding machine commonly known as universal tool and cutter grinder. Present trend is to use tool and cutter grinder equipped with CNC to grind tool angles, concentricity, cutting edges and dimensional size with high precision.

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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