Optimization Of Grinding Machine Grinding To Extend The Life Of The Way

Optimization Of Grinding Machine Grinding To Extend The Life Of The Way

Grinding is used for pulp and paper industry in the fiber cut, the
refiner separating the "heart" consumable parts. Grinding of the use of
life on the refining process yields, energy consumption, safe operation
and grinding machines play a decisive role in various economic
indicators. How appropriate for the specific production grinding to
achieve optimal results, this area has been the focus of research and
development. Refining the process of how to extend the life of the
process grinding methods and measures to be discussed.

1. Grinding wear on the production of

Pulp slurry occurs during poor quality and productivity decline, perhaps
because of grinding wear and tear reasons. Select the best time is to
replace the production of important technical issues.

In Yunnan Province Paper mill 75t / d of mechanical pulp production line
system of Eucalyptus APMP pulp with a second disc mill (KavernerHymac
production) of grinding damage, made into a pulp beating degree is only
20 ° SR, pressure screen good pulp fiber

bundle content of 2%, papermaking of LWC base paper surface strength is
slightly lower.

Mudanjiang Hengfeng Paper Group Co., Ltd. Shanghai paper making
machinery plant the original 2362 machine in operation in 1992, can only
produce about mid-range permeability 30coresta Cigarette Paper .
Purchased the plant poplar, oak, birch, wood and other forging and
grinding of various types, beating equipment easy to wear, and tooth
grinding and material instability, into a pulp production of high
quality cigarette paper can not.

Tracing paper of the "white point" is a small fiber, resin blocks or a
combination, and sometimes the whole site there, especially conspicuous.
Freeman Specialty Paper Inc. found that: site takes too long to use mill
grinding, the feed volume increased, knife spacing, weakened the role of
sub-wire broom, cut off the greater role of the small fibers increased,
should be changed regularly grinding.

Qiqihar Paper Co., Ltd. introduced ANDR IT Z's 200t / d total production
of low aspen APMP line quantitative offset newsprint practice shows that
such place of poplar birch, poplar fiber morphology as the control
process is more important beating; the grinding life of about 2500h;
grinding using the time The longer the lower the beating, tooth surface
passivation on the weakening pulp cut off, thus resulting in reduced
pulp beating degree; role in the process when grinding high
acceleration, grinding teeth wear serious, not to mention beating up and
the degree of plasma material can smoothly through the grinding,
resulting in feed screw plug.

Qiqihar Paper Co., Ltd. single-turn pressure plate mill MRSD58/62
(AndritzSprautBauer Company production) and grinding with two grinding
zone: a broken ring for the area, the grinding of the broken loop region
from 6 tooth slices, material 174PH, dental dam thick, larger distance
between teeth; one for fine grinding ring area formed by the 18-tooth
chip, made of alloy 440, the tooth dam moderate, middle distance is
small; wheel grinding and setting disc grinding gap between the 0.9 ~
1.1mm. Among them, into a grinding mill of the concentration of control
in 28% and 35% Best; into Erduan disc refiner's beating degree of about
17 ° SR, the concentration of control in 22% to 25% of the best; with
the use of time extension into the slurry in order to ensure the
quality, plate mill beating the concentration must be reduced. Broken
areas or teeth grinding teeth are damaged and ditch blocking, grinding
wear serious, if the 30% decline in refining capacity, must be replaced
grinding.

2. To improve the service life of grinding technology methods and measures

2.1 improve the refiner's production level of precision and control

Heilongjiang Star Paper Co., Ltd. 450 double-disc grinding, due to years
of long, quiet drive chassis built office and mobile seat installed
fixed disk Department corrosion, wear a difference of 3 ~ 4mm, 410
direct export to Taiwan office wear bigger 420 around the screw fixed
grinding wear and corrosion resistance and the emergence of larger-type
speakers, resulting in grinding can not be a good fit with the body.
Will move within the plane seat and chassis corrosion surface car to
about 3 ~ 4mm, then cars straight exit station; screw holes drilled to
the depth of processing, into M14, plus pad, and pad with bolt seal
fastening, use the same effect was replaced with new parts, spare parts
save money.

Grinding of the structure, tooth type, tooth surface slope and angle,
and the safe operation of equipment and as a direct impact on pulp
quality. Slurry with a fine-tooth lower beating strength; a fine-tooth
into the pulp fiber to increase the uniformity of treatment to maintain
the fiber length to fiber cell wall faster hydration to promote better
integration of fiber. Beating the high increase in the intensity of the
fiber cut, easy to produce more small fibers; in the same tensile index,
the fine-tooth into the pulp has a high opacity, bulk and air
permeability; on broad-leaved Wood pulp Fine-tooth grinding can save
energy beating, but also reflects its high permeability and opacity, but
also take into account the strength of the fiber. Fine tooth grinding at
the mill for wood pulp fiber and non-wood fiber pulping; fine tooth
grinding casting method is not used, but with a special welding method;
life of ordinary cast iron 3 to 4 times. Grinding designed to a certain
pitch, to avoid a sudden increase in mechanical energy and the local
wear of tooth surfaces. Gradient selection is too small, the resistance
increases feeding, increased load caused by feeding; if a larger
gradient will cause uneven wear, impact grinding life.

Town in Jiangsu Province and Jilin Paper Co., Ltd. Jiang Dadong
integrity Industrial Development Co., Ltd. spun plasma low-intensity
beating of a fine-tooth grinding, more than a year after an application
of that low-intensity beating knife to use the improved bar, width
2.47mm, knife groove width 2.47mm, knife Goushen 6mm. The grinding
material is still used Nitinol alloy, cultural paper in a papermaking
pulp staple line of low intensity, not to adjust operating conditions,
very few fibers cut, silk broomed better; tons of pulp on average from
the 173 ~ 168kWh energy consumption down to 158 ~ 146kWh; Paper Breaking
length to upgrade from the 5632m to 6546m, folding to 48 times from 26
times.

Italian poplar production line used AndritzSprortBauer APMP's plate mill
grinding broken area high concentration gradient is about 1:11 more
appropriate, feed load more stable; coarse grinding zone when the power
gradient 1:250 stability, feeding spiral smooth operation, high into the
pulp beating, wet weight in a better level of grinding longer life
expectancy, the vertical rack to maintain uniform wear, energy
distribution of balance; grinding zone gradient generally 1:800 appropriate.

Scope Of Gold Mining Equipments

The growth of any mine depends mainly on the types of equipments used in
it. They may be high graded or low graded equipments. This varies from
high, small and medium sized companies. Gold mining equipments also
belong to the same category. Gold is the metal being loved by all and
has become a major area of investment. Keeping in mind about the facts
of today's world, the instability faced in the stock markets which is
giving lots of pain to the investors in the stock market, we should
think twice before investing.

The accounts of the industries investing in gold, gold mining and their
equipments are showing very high gains. There has been no fall in the
recent times. In other words, it is the safest way to invest money as
there is surety of returns at a faster pace than any other way. This
investment shines like the beautiful metal gold.

These advantages have given way for a small setback for the companies. A
little of bad also comes hand in hand with the good. The confirmed rates
of growth and increasing demand for gold has urged the miners to go on
strike against the companies asking for increase in their wages. Many
world famous mines and companies related to gold mining equipments faced
this problem for quite some time but however it did not affect the
output of the gold mining industries. The wages of the miners grow along
with rates of gold.

Nevertheless this problem had no specific effect in the growth of the
gold mining companies. The graph of the profit remains to be growing at
a steady rate. The disputes amidst the companies and the miners seemed
not to affect the functioning of these industries. Guarantee in
outstanding profit is the picture of all the people investing in gold
mining equipments. This seems to be the best part of the companies in
this field.

The gold mining factories are also giving good service to the machines
since servicing of the machines plays a very important role for
continuous functioning of the mines. Again by rendering services, the
industries are happy in getting double profits. Many companies around
the world are proving their victory and surely will continue to make an
outstanding yield in money. Gold mining equipment companies are one of
the smartest ways to make money.

how to confirm the ball mill type?

ball mills can satisfy different requirement, and have good features such as low consumption, high capacity per hour, no pollution to the enviroment around, simple to be repaired.
We have the good service to our customers, if they cannot install the machines, we can send our technician come to your location, and install for you. We make each endeavor to satisfy our customers.
but i do not know how to confirm the ball mill type?


Notes on choosing the type of ball mill:
1. Know the hardness of your own ore.
2. Choose the energy-saving ball mill to the great extent.
3. Know the ore fineness required.
4. Choose the right diameter and length of the ball mill according to the output requirement.
5. Buy it from the professional ball mill manufacturer relative to your ore which would be best.
6. The manufacturer should hold the market share in the place where your enterprise located.
7. Choose the new-type transformation ball mill with the rotate speed different from the module. 
8. Choose the aperture of the close board and the sub-freignt space according to the ore fineness of your demand.
9. Choose the lining board material and set the thickness of the steel plate on the mill body by the price of the ball mill.
10. Slect the modules of the big gear and pinion, and the manufacturers of the electric motor and the speed reducer.

Coal Mining Equipment Introduce

Coal mill also called coal pulverzier or coal powder mill is grinding
mill that is used in coal mining industry, such as vertical coal mill.
And in general, vertical mill includes mineral series and coal series.
The first series grinder can be widely used in cement making, power,
metallurgy, chemical, ore industries. And the vertical coal mill also
called coal grinder is the most used machine for coal grinding according
to our mining experience. In some cases, coal mill is not just one
grinder mill, it will include some optional equipment such as vibrating
feeder, vibrating screen, belt conveyors and so on to finish the coal
milling process. So, coal mill is also used widely in many industries
besides coal mining.
Coal mill classification

Coal mill is an efficient tool for grinding coals into fine powder in
coal mining industry. According to its fineness and working principles,
we divide coal mill into coarse power coal mill and fine coal mill.
Coarse powder mill is a kind of new high-tech milling machine to meet
the requirements of coarse powder processing customers. It is the ideal
equipment to replace Raymond mill, ball mill, and other traditional mill
which only process fine coal powder materials.
Coal mill working principle

Raw coal is fed through a central coal inlet at the top of the
pulverizer and falls by gravity to the rotating grinding table, mixing
with classifier rejects returned for re-grinding. Centrifugal action
forces the coal outward to the grinding ring where it is pulverized
between the ring and three grinding rollers. Grinding load, transmitted
from the tension rods through the loading frame to the roller
assemblies, holds the rollers in contact with the grinding ring. The
rollers adjust vertically as the depth of the coal load increases or
decreases.

A nozzle ring on the outside perimeter of the grinding ring feeds
primary air to the pulverizer. Pyrites and tramp metal fall through the
nozzle ring openings to be scraped into a rejects hopper.

A stream of low-velocity air carries the particles of pulverized coal
upward where they enter the classifier inlet vanes. Fine particles
travel to the burners in the primary air stream, but the larger, heavier
particles are returned to the grinding zone for further pulverization.

Aleris Signs Joint Venture Agreement for Greenfield Rolling Mill in China

BEACHWOOD, Ohio, Oct. 20 /PRNewswire/ -- Aleris International, Inc. has

signed a joint venture agreement with Zhenjiang Dingsheng Aluminum
Industries Joint-Stock Co., Ltd. for the construction of a
state-of-the-art aluminum rolling mill in Zhenjiang City, Jiangsu
Province in China that will produce semi-finished rolled aluminum
products. Aleris will be the majority owner in the venture.

"This agreement demonstrates our commitment to China," said Steven J.
Demetriou, Aleris chairman and chief executive officer. "The investment
in this facility is a key component of our growth strategy, which
includes a significant focus on serving customers in China.
"With this venture, Aleris and Dingsheng will build and operate one of
the most technologically advanced rolling mills in the world. Dingsheng
is a distinguished company with recognized manufacturing expertise and
strong leadership, and we are pleased to be working with them. We also
appreciate and value the support of the Jiangsu Province and the City of
Zhenjiang."
Construction of the plant will begin upon receipt of the customary
government approvals and is expected to be completed within two years.

source:http://www.prnewswire.com/news-releases/aleris-signs-joint-venture-agreement-for-greenfield-rolling-mill-in-china-105362468.html

Foulath Steel to take over Saudi rolling mill

The National reported that the Kuwaiti and Japanese JV behind Bahrain's USD 1.2 billion Hidd Steel Mill project is planning to acquire a steel rolling mill in Saudi Arabia.

Bahrain's biggest steel company will take over a Saudi rival by next month as it pushes on with an expansion effort to become the Middle East's first fully integrated producer. The acquisition will allow the company to drop plans to build an additional plant in Bahrain and accelerate its timescale of delivering steel products from light to heavy sections by 3 years.

The Hidd Steel Mill in Bahrain is being constructed by United Steel Company, JV of the Bahrain based United Steel Holding Company and Japan's Yamato Kogyo Company.

Mr Khalid Al Qadeeri CMD of Sulb said that "Sulb won the tender and we are in negotiations to acquire a rolling mill in Saudi Arabia. We are in the final stages of due diligence and confident that we will conclude the deal by November.

Mr Khalid Al Qadeeri vice CMD of Foulath said that Foulath's acquisition reflects its strategy to control every link in the steel supply chain from iron ore mines to the output of finished products all with a view towards lowering its costs of production in a continued down market.

Mr Al Qadeeri said that the company would commit billions of dollars to its expansion effort and would put up as much as 70% equity in each investment. In a good market everyone makes money in a bad market, if you're not integrated, you won't survive. You can't survive as a standalone. Other regional producers including the UAE's Emirates Steel Industries and Saudi Arabia's Hadeed have pursued their own integration strategies but have yet to invest in raw material pellet plants or iron ore supply. The billets will be transported via barge from Bahrain to the new mill.

Mr Robin Parker the regional manager for Stemcor said that prices for imported steel rebar in the Gulf, a benchmark for the industry have increased 16.5% over the past 12 months to USD 600 per tonne. Prices could hit USD 700 per tonne next year.

Mr Al Qadeeri said that Foulath's acquisition target a steel mill in Saudi Arabia will be fed by barge with steel pellets produced at its plants in Bahrain. It is also building USD 1.2 billion three part steel plant in Bahrain, adjacent to its pellet plants that will turn a portion of the pellets into finished, heavy steel products such as I beams for the construction industry.

He said that the plant is 49% owned by Yamato Kogyo, a Japanese company, and is due to be completed by the beginning of 2013. Foulath's goal is that half of the pellet output from Bahrain will be steered towards In house steel making plants including the acquisition in Saudi Arabia.

(Sourced from the National)

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BCaiWa Google Profile & Industry Glossary

Faster Production of Inside Threads

With the development of CNC machine tools, thread milling was introduced as an additional possibility. Here, the thread is milled into the hole using specific circular and feed motions of the tool. Each of these three methods is suited to different applications.

The "Classic" Method: Tapping

In conventional tapping, material is removed in a continuous cut. Tapping comes up against its limits in materials with hardness greater than 60 HRC, as well as in deep threads, where problems arise related to dimensional accuracy and tool breakage due to chip-removal difficulty.

Chipless: Cold-Form Tapping

Cold-form tapping is used for materials with a strength of less than 1200 N/mm2 and a stretch-at-break of more than 8 percent. Thanks to cold-forming, this chipless process achieves threads with higher static and dynamic strength in combination with very good surface quality.

However, the disadvantages of cold-form tapping include the high torques compared to conventional tapping, as well as the need for high-quality lubricants.

Productive and Precise: Thread Milling

Thread milling is suitable for almost all materials and offers the greatest flexibility and productivity. Thread flanks are machined cleanly and there is no axial miscut. For hard-to-machine materials, thread milling tends to be the best method. One underappreciated advantage is the fact that when the tool breaks, it can be removed easily. The restrictions on thread milling relate to the thread depth, which can generally be no more than 3 times the thread diameter.

Whatever threading method is used, one thing is certain: With the thread cycles in today's advanced CNC software modules, programming is quick and easy.

Cycles for the Production of Inside Threads

The actual programming requirements of inside threads are complex, because a number of math values have to be taken into consideration. Advanced CNC thread cycles can take care of this complexity in an efficient manner. These cycles ask input factors including the required tool, thread depth and cutting speed, as well as procedure-specific parameters.

Those procedure-specific inputs take into account the individual characteristics of the particular tapping operation—such as, for example, whether the conventional tapping thread is to be produced in a single cut or via chipbreaking. If yes, the reversal movement and change in direction of rotation for chip breaking can be automatically programmed the software.

Linking of Work Steps

Separate work steps typically also are needed for the production of inside threads. For example, the hole is centered and pre-drilled before the inside thread is created. If the workpiece contains several identical inside threads, then these work steps must be repeated for each position. To reduce the programming work involved, sub-programs can be created that are called up for the various positions.

In fact, with the proper CNC software, programming of these steps can be carried out even more efficiently. All the work steps are programmed just once, then linked via a position pattern. The programming for centering, drilling and tapping is created one time, applying to all positions of the pattern. Configurable cycles for lines, hole circles, grids, frames and special positions are available as these position patterns.

Excerpt from:

Faster Production of Inside Threads

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