Is for abrasive grinding , grinding and polishing tools

Is for abrasive grinding , grinding and polishing tools . Most of the abrasive is made ​​of abrasive plus artificial abrasive binding agent , is also useful natural mineral rock directly processed into natural abrasive. In addition to grinding and other metal processing machinery  shop roll manufacturing industry has been widely used , but also for food processing, paper industry and the ceramics, glass, stone, plastic , rubber, wood and other non-metal materials processing.
Abrasive in use , when the blunt abrasive , because the abrasive agent or a combination of its own to break fracture , the abrasive grain from the partial or complete loss , the working surface of the abrasive grinding emerging new cutting edge , sharp or continuously exposing new abrasive grains , the abrasive can be maintained within a certain time cutting . This self -sharpening abrasive is abrasive tool compared with the sanding paper roll  general prominent feature .
As early as the Neolithic Age , humans had already started to process the application of natural stone knives , stone axes , bone , horn , and tools such as a tooth ; 1872 , appeared in the United States with natural abrasives combined with clay firing ceramic grinding wheel ; 1900 years ago, the advent of artificial abrasives , using artificial abrasives manufacturing have produced a variety of abrasives for grinding and grinding create the conditions for rapid development . Since then , natural abrasive in the abrasive proportion gradually reduced.
Abrasives source of their raw materials , with natural and artificial abrasive abrasive categories. Commonly used in machinery industry is only natural abrasive Whetstone . Artificial abrasive characteristics according to the basic shape and structure of the distinction between a grinding wheel, grinding , stone, sand tile ( the foregoing collectively referred abrasive ) and coated abrasives five . In addition , it is customary also put abrasives abrasive as a class .
The main features include abrasive abrasive , grain size, hardness, structure and bonding agent five factors . Depending on the choice of the appropriate applications can directly improve the processing quality and productivity.
1 Abrasive
Abrasives are used for abrasive corundum, white corundum, silicon carbide and green silicon carbide . Corundum high toughness , suitable for grinding carbon steel, alloy steel , malleable iron and hard bronze high tensile strength of the material. Corundum has a higher hardness than corundum , cutting performance is better, for hardened steel, high  velcro disc carbon steel , high speed tool materials such as grinding process ; black silicon carbide , high hardness, brittle and sharp , suitable for grinding , cut low tensile strength of the material , such as: cast iron, glass, ceramics , stone, refractory materials , etc. ; darker green silicon carbide high purity silicon silicide . Suitable for grinding carbide, optical glass , precious stones, agate and other hard and brittle materials .
2 Granularity
The choice depends on the particle surface of the workpiece machining accuracy and productivity requirements. Coarse-grained and medium-grained abrasive for roughing and semi-finishing , and fine-grained abrasive , it applies to finishing and super finishing . Physical and mechanical properties are grinding department also factors that determine particle size , low hardness , ductility and toughness of the material is appropriate to coarse-grained abrasive machining , high hardness brittle materials appropriate to fine-grained abrasive.

Hardness, abrasive wear of the

Abrasive wear is due to a friction surface of the convex part and the other hard- surface contact between the friction surface or both the hard particles exist in the event of relative movement of the two surfaces of the one surface or both surfaces of the material is  transferred  Mounted flap wheel signs of wear . (B ) abrasive and abrasive wear mechanism for the relative movement of the part surface , the abrasive force on the perpendicular to the surface of the decomposed component of the force parallel to the surface . 1 perpendicular to the surface embedded in the surface of the abrasive component , good material for the plastic surface indentation large dense , repeated action , resulting in fatigue and damage , the brittle  flap wheel materials do not produce distortion on the surface of brittle fracture . (2) parallel to the surface of the abrasive component tangential movement generated , resulting surface is scored , and the cutting groove is left , the plastic material , the abrasive cutting surface of the friction will cut a chip of brittle materials , abrasive cutting time cut from the surface a lot of debris.
Abrasive wear rate is very large, many major damage in the form of machinery and equipment . (C ) the main factors affecting abrasion 1 Abrasive wear particle size on the amount of wear of the metal with the increase of the size of the abrasive increases when the abrasive size increases after a certain size , the wear rate is constant 2 Abrasive the cutting and grinding disc  geometry of the impact on the wear of the sharp edges of abrasive abrasive wear than the sleek , high-speed , abrasive being blunt , the wear rate of decline , if the abrasive is ground , the grinding speed will increase by 3 . abrasive hardness on the amount of wear impact Thus, the enhanced surface hardness of the part approaches or exceeds the hardness of the abrasive , to improve the wear resistance of parts , but the high hardness of the material , will cause decrease in toughness , increased brittleness and other consequences. ( 1 ) Abrasive hardness is lower than the hardness components , the wear amount of the difference in hardness between the two , the difference increases, the wear rate decrease ( 2 ) parts abrasive hardness higher than the hardness , the wear serious , the difference in hardness between the less small , wear reduction .

Abrasive size shape and position of some flaws

Abrasives standards relating to the position tolerance checking parallelism and concentricity, technical guidance document specifies the shape of the tolerance checking roundness, flatness, and cylindrical. Industry, said more than five items as "five degrees." Indeed wheel hole shop roll  and the vertical plane directly affect the use of grinding wheels, should be strictly controlled, so abrasive geometric tolerance checks generally have six.
1. Flatness is the ideal abrasive for an arbitrary plane roughness of the plane. If not good, easy card when chucking broken wheel or cause Obscure, rotation rupture. 2. Roundness is abrasive cylindrical surface, spherical and conical surfaces are ideal for cross-sectional shape of the edge degree of error circle, such as poor will increase the abrasive sanding belt  amount of dressing. 3. Cylindrical refers in two coaxial cylindrical grinding cylindrical inner diameter of the difference between the maximum and minimum. Will also increase the amount of good dressing, affecting the balance wheel.
4. Parallelism refers to the abrasive surface across the face of its inclusion on the basis of both ends of the plane is grinding disc  not parallel to the degree where the ends are not parallel to the surface, the wheel rotates to generate yaw.
5. Concentricity is a grinding wheel or with holes in the center of the concentric circles on the basis of the degree of deviation. Wheel will produce bad beating, affecting quality of the workpiece, but also cause wheel breakage.
6. Verticality refers to the axis of cylindrical grinding holes or vertical extent on the plane, bad, wheel rotation will produce end swing around, affecting the quality of the workpiece and the grinding wheel strength, it tends to break the wheel card.
7. Runout tolerance, for some wheels, such as cutting and grinding with a data sheet wheel, depressed center grinding wheel, grinding wheel, etc., but also for national standard circular runout measurements.

In most abrasive grinding - grinding wheel

In most abrasive grinding - grinding wheel. Added to the abrasive wheel is binding agent, the green compacts, drying and calcining a porous body made. As abrasives, binders and manufacturing process is different, the wheel characteristics vary greatly, so sanding roll  the grinding machining quality, productivity and economy have a significant impact. Mainly by the characteristics of grinding abrasive particle size, binder, hardness, structure, shape and size and other factors.
Wheel variety, according to the abrasive can be divided into ordinary abrasive (corundum and silicon carbide, etc.) and natural abrasive grinding wheels and superabrasive (diamond and cubic boron nitride) grinding wheel;
Shape can be divided according to  ceramic belt level grinding wheels, bevel wheel, cylindrical grinding wheels, cup wheels, disc wheel, etc.; binding agents can be classified according to the ceramic grinding wheel, resin grinding wheel, rubber wheel, metal grinding wheel. The wheel parameters are abrasive, viscosity, hardness, binders, shape, size and so on.
Since wheel usually work at high speed, thus turning test should be carried out before use (guaranteed wheel at  grinding wheel china the maximum operating speed, not break) and static balance test (to prevent machine vibrations caused by the work). Grindstone at work for some time, should be trimmed to restore grinding performance and correct geometry.

Grinding wheel as the most important one class of abrasive

 Grinding wheel as the most important one class of abrasive. It is through the combination of the abrasive agent is added through the green compacts, drying and calcining a porous body made. Because of the differences in raw materials and manufacturing processes, has Sanding Sheets  produced a grinding wheel features difference is very big, so the effect of grinding process used has a significant impact.
Wheel characteristics determine factors: abrasives, intensity, binders, hardness, structure, shape and size. Wheel variety:an be divided according to the ordinary abrasives abrasives (corundum and silicon carbide, etc.) and natural abrasive grinding wheels and superabrasive (diamond and cubic boron nitride) grinding wheel;hape can be divided according to level grinding wheels, bevel wheel, cylindrical grinding wheels, cup wheels, disc wheel, etc.; binding agents can be classified according to the  Bonded abrasives ceramic grinding wheel, resin grinding wheel, rubber wheel, metal grinding wheel. The wheel parameters are abrasive, viscosity, hardness, binders, shape, size and so on.
Since wheel usually work at high speed, thus turning test should be carried out before use (guaranteed wheel at the maximum operating speed, not break) and static balance test (to prevent machine vibrations caused by the work). Grindstone at work for some time, should be trimmed to restore grinding performance and correct geometry.

the large pores of the grinding wheel

Large pores wheel production ranges are: abrasive silicon carbide and corundum and other general options, such as the commonly used green silicon carbide (GC), black silicon carbide (C) and corundum (A), corundum (WA), such as several of these brittle and sharp abrasive, high hardness, good thermal and electrical conductivity; abrasive particle PSA sanding disc  size (36 # ~ 100 #); binding agent (usually a ceramic binding agent); Hardness (G ~ Q levels); shape (with flat-shaped, concave, cup, bowl or dish, etc.); pore size (approximately 0.7 to 1.4 mm).
Some grinding through a special, the internal porosity of the grinding wheel increases, so to processing requirements. This product choice should note the following:
 First, because the large pores in the grinding wheel with high durability, cutting ability and can not easily be  sandpaper roll blocked, etc., it is more suitable for grinding metal and leather, rubber, plastic and other non-metallic materials and coarse grinding.
 Second, at the same time, but also because it has a fast heat dissipation characteristics, so in grinding large number of heat-sensitive materials, thin-walled workpieces and dry milling process (eg rail grinding carbide cutting tools and machine tools, etc.) with good results.
 Third, the large pores of the grinding wheel and other general vitrified grinding wheel basic method for  file belt producing the same. Difference is in the amount of the ingredients plus a pore agents, it volatilizes completely before sintering the wheel or burned ash, resulting in large pores.

the stainless steel grinding wheel is generally

he hardness of the stainless steel grinding wheel is generally within the range C ~ N, where J, K, L, M use of the wheel. Microcrystalline corundum grinding wheel face, the selection of appropriate hardness J. In addition, large diameter grinding wheel face bore or grinding, the grinding wheel and the workpiece contact surface, the wheel is easy to passivation, to be elected lower hardness wheel; grinding forming abrasive sanding belt  surface, should increase the hardness of the wheel , otherwise they will be faster wheel wear and damage-surface precision grinding wheel; grinding hollow and thin wall of the workpiece, the workpiece deformation, and therefore should adopt a softer wheel; discontinuous surface grinding, abrasive easy to fall off, you should use a hard wheel.Organization
Stainless steel toughness, strong adhesion, to avoid clogging the grinding wheel, grinding wheel organizations should choose a more loose, generally 5-8 is appropriate. Back to eat large knife and a large contact area should be selected organization loose wheel, the surface roughness Ra values ​​that require low or form grinding should be used in  grinding disc a more compact organization of the wheel.atural diamond as found in nature is the hardest material. Using it as raw materials to produce diamond grinding wheel, with fast cutting, wear characteristics, the majority of users. But the natural diamond is limited, so synthetic diamond is made. So we often say that the diamond wheel is divided by the two kinds of natural diamond and synthetic diamond.Using synthetic diamond as the main diamond abrasive wheel made of diamond substantially retains the characteristics of the grinding sharp, high efficiency, to maintain a good precision, the actual production applications, but also has a large-scale use of natural diamond and a large natural Bonded abrasives  resources, faced with fewer and fewer of the situation, so as to enhance the price of such products, in most respects, this diamond wheel than the synthetic diamond has certain advantages, but in some respects, but also to some extent artificial diamond make up for the shortcomings of such a diamond wheel, the two complement each other.
Diamond grinding wheel sharp, high efficiency and high precision grinding, due to its unique nature has been widely used in various industries.

Concrete cutting at different cementitious materials

Concrete cutting at different cementitious materials, sub-cement concrete, asphalt concrete, gypsum concrete and polymer concrete, etc.; Apparent density at different points heavy concrete, ordinary concrete, lightweight concrete; by the use of different functions, sub-structure with concrete, road concrete, concrete, heat-resistant concrete, concrete shop roll  acid and radiation concrete; according to the construction process is different, but also points shotcrete, concrete pumping, vibration grouting concrete. Classification can also be based on concrete strength grade of concrete to points. Accordance with the relevant standards, the concrete strength grade concrete English name should be the first letter of the standard value plus its strength to express. Such as C20, C30 and so on. In the past with the "label" to describe intensity grading is based on the value of the cube compressive strength  Abrasive paper of standard values ​​known Chinese "number" word to express, such as 200, 300 and so on. In order to overcome the defect of low tensile strength of concrete, it will cement concrete with other materials, the emergence of reinforced concrete, prestressed concrete, a variety of fiber-reinforced concrete and polymer impregnated concrete.
In addition, with the development and construction of concrete needs, there was expansion of concrete, aerated concrete, fiber reinforced concrete and other special functions. Pumping concrete, concrete products and new concrete construction technology to bring convenience.

Diamond plated metal at a certain temperature to prevent

Diamond plated metal at a certain temperature to prevent, under the conditions of pressure and sintering time of oxidized graphite and hot corrosion resistance of iron. The author of the different metals plated diamond for TG (TG) analysis, discovery of diamonds began at  PSA sanding disc about 800 ℃ weightlessness and graphite. The coated Ti, W, TiN, etc., respectively diamond 900 ℃, 925 ℃ and 940 ℃ weight loss when starting and graphitized. Description diamond plated metal back helps prevent oxidation and graphite, can withstand thermal shock and thermal decomposition. High temperature sintering carcass showed a protective effectStrong carbide plating element in the sintering conditions can be formed at the interface of diamond and  ceramic belt the matrix alloy carbide, diamond and matrix conducive to chemical bonding with the metal metallurgical bonding, greatly improving the gripping force of the matrix of the diamond, the diamond coated tungsten X-ray analysis showed that the surface of the diamond has been formed with WC. 
he static strength of the diamond can be increased from 5% to 20%. Diamond plated metal, may increase cut off disc  the friction of the diamond, which helps increase the holding force. 3. Fine powder and pre-alloyed powderIn the production of special saw blade, should adopt the ultrafine metal powder and pre-alloyed powder. Metal powder sintering temperature helps reduce thinning, increased hardness. Use of pre-alloyed powder, low melting point metal to prevent premature loss and segregation, sintered products in favor elastic limit and yield strength, to increase the gripping force of the diamond, but also reduce the sintering temperature and holding time.

use of corundum grinding wheel Precautions

It is used for super alloys, cermets, ceramic products, glass products, limonite, high speed steel, alloy tool as well as many other new superhard materials ideal grinding tool.
There are many special resin binding cutting diamond wheel for rapid cooling. These wheels especially suitable nonwoven belt  for carbide tools (such as saws, cutting machines, drilling tools, end mills, etc.) grinding.
In addition, these tools can also be used carbide dies, rollers and carbide wear parts, precision grinding process. Resin glue wheel is mainly used in ceramics, precision machining and grinding of tungsten carbide and ceramic thermal spray coatings. It can also be used in conjunction with the CBN, for grinding high-speed steel, tool and die steels  ceramic flap disc and superalloys FtRC50 above.Matching problem mainly refers to the installation of the chuck and grinding wheel logistic problems. According to standards, wheel diameter not less than chuck is mounted sand office diameter of 1/3, and the corresponding provisions of the wheel wear to  Abrasive paper a diameter of 10mm diameter larger than the chuck should be replaced with a new wheel. So there is a chuck and grinding wheel matching problem, otherwise it will be the case, "big horse car" caused by equipment and material waste; "small horse cart" do not meet the safety requirements, could easily lead to accidents. Therefore, chuck and grinding wheel reasonable match, one can save the device, cut about materials; hand and meet the safe operation requirements. Furthermore, the wheel should be installed between the chuck chuck diameter greater than the diameter 2mm, 1mm ~ 2mm thick cushion.

rinding wheel abrasive hardness

Grit SiC grinding wheel abrasive hardness than the high alumina (Hv2800 or more). Brittle and sharp, and has good thermal conductivity and electrical conductivity, suitable for grinding cemented carbide. Which commonly is black and green silicon carbide wheel. The green silicon abrasive paper sheet  carbide grinding wheel is more suitable for carbide tools.
2) Particle size: The particle size indicates the size of the degree of abrasive. Grains per inch in length through the perforations on how many numbers as that symbol. 60 refers to the abrasive particle  Sanding Sheets size for example just by the length per inch of the screen with 60 holes. Therefore, the larger the number, the finer the grit said. Coarse abrasive tools should be selected numbers of small grinding wheel, grinding tools should be selected number large (ie, abrasive fine) of the wheel. Particle board used for the 46 - Taiwan 0 number of soft or medium hard wheel.
3) Hardness: The hardness reflects  metal cutting wheel the abrasive grinding wheel during the grinding force, the grinding wheel surface from the ease of shedding. Wheel hard, abrasive surface that is hard to fall; wheel soft, which means that abrasive easily. Hardness and abrasive wheel hard and soft are two different concepts, must be clearly distinguished. Grinding HSS and carbide tools should be selected turning soft or medium soft wheel.Furthermore, the choice of grinding wheel should also be considered binding agent and tissue. Generally used in ships and factories vitrified (Code A) and medium organizations of the wheel.
In summary, we should be based on the correct selection of grinding wheel cutting tool materials. Sharpening high speed steel tool should be used in a particle size of 46 to 60 soft or medium soft aluminum oxide wheels. Sharpening carbide tools should be used in a particle size of 60 to 80 soft or medium soft silicon carbide grinding wheel, the two can not be wrong.

Synthetic superhard cutting tool materials

 Synthetic superhard cutting tool materials, manufacturing many ways, here introduces hot vapor deposition method and the.
Hot pressing manufacturing of diamond and cubic boron nitride devices are used in the top or sides of the top six  abrasive paper sheet sides of the hydraulic machine. Suppression of monocrystalline superhard materials. Pyrophyllite raw materials need to be placed in the cavity. Pressing the raw material powder PCD monocrystalline graphite sheet, graphite sheet and Ni-Mn activator sheet laminate is placed in the cavity; suppress PCD PCD poly crystal wafers is the raw material powder, adding binder Ni, Si, Co, etc.; suppression CBN crystal powder raw materials for the hexagonal boron nitride (HBN) powder; suppress poly chips PCBN CBN crystal powder raw materials, but people need to be set separately catalytic agent and binding agent. Hot-pressing process is shown in Figure 1, Figure 2. The pressure, temperature and pressing flap wheel  time are listed in the figure.
Pressurizing the boost pressure during, the final pressure is different, pyrophyllite pressure in the cavity of the top portion of the pressure is not the same weight, in Figure 1, Figure 2 shows a top hammer unit pressure is the pressure . Temperature chamber temperature. Time is the heating time, holding time and cooling time sum of the process, for a variety of presses, these parameters will be different

Diamond crystals are cubic plane

Diamond crystals are cubic plane, since each crystal form and surface atomic arrangement atom density difference and the distance between the different planes, resulting in a natural diamond crystal anisotropy, so the performance of the diamond crystal surface only metal cutting wheel  of the physical and mechanical different performance, ease of manufacture and service life which are not the same, the microstructure of the crystal surface damage strength are also significant differences. Microscopic diamond crystals Hertz strength test method used to determine, since the diamond is a typical brittle material, the strength values ​​are generally larger deviation depends on the morphology and distribution of stress distribution range, so suitable analysis of probability theory. When the effect of stress is the same, (110) crystal plane maximum probability of damage, (111), followed by (100) crystal  ceramic belt plane of the minimum probability of breakage. Ie external force, (110) crystal face the most easily damaged, (111) crystal face, followed by (100) the most difficult to break. Although the (110) crystal plane grinding is higher than the (100) crystal plane, but the experimental results show that the (100) crystal face and the other plane has a higher resistance to stress, corrosion, and thermal degradation capability. Considering the combination of micro-strength, a (100) plane around the flank of the tool to make easy tool edge grinding of high quality, easy to produce microscopic chipping.

other special grinding applications

with epoxy honing wheel and double cone, butterfly, Shuangdie type, worm wheel, etc., in the gear grinder, right through hardened gears for gear grinding.
 with a strong resin grinding wheel, grinding the  sanding roll tool on the hot hardness with high hardness, wear resistance and sufficient strength and toughness of the cutting tool materials, such as carbon tool steel, alloy tool steel, high speed steel , carbide, etc., for grinding tools, to achieve the desired accuracy, surface roughness and the correct geometry, the cutting tools with high sharpness and durability.
 other special grinding applications
 resin grinding wheel rails, in a dedicated rail grinding train, on the rail  with a conductive resin grinding wheel, grinding on the  Sanding Sheets electrolysis, high hardness for some parts, such as a variety of carbide cutting tools, measuring tools, extrusion drawing dies, rollers, etc., as well as ordinary grinding hard machining holes, deep holes, thin-walled tube, slender rod parts and complex surface parts, electrolytic grinding. Wherein the electrolysis processing volume accounted for 95% Abrasive machining effect only 5%. Therefore, electrolytic grinding efficiency than conventional grinding.
(3) PVA (polyvinyl alcohol) polishing wheel, PU (polyurethane) wheels, such as non-woven polishing, the polishing machine, the stone, glass, stainless steel, etc. polishing.

grinding and polishing tools

Is for abrasive grinding, grinding and polishing tools. Most of the abrasive is made of abrasive plus artificial abrasive binding agent, is also useful natural mineral rock directly processed  standard abrasives into natural abrasive.
Abrasives source of their raw materials, with natural and artificial abrasive abrasive categories. Commonly used in machinery industry is only natural abrasive Whetstone. Artificial abrasive characteristics according to the basic shape and structure of the distinction between a grinding wheel, grinding, stone, sand tile and coated abrasives five. In addition, it is customary also put abrasives abrasive as a class.
In addition to grinding and other metal processing machinery manufacturing industry has been widely used, but  grinding disc also for food processing, paper industry and the ceramics, glass, stone, plastic, rubber, wood and other non-metal materials processing.
The main features include abrasive abrasive, grain size, hardness, structure and bonding agent five factors. Depending on the choice of the appropriate applications can directly improve the processing quality and productivity.

brasive grinding four stages of

Our approach is the choice of grinding one of the oldest countries, as in the ancient science masterpiece "Heavenly Creations" in there "cut, consultation, cut, grind," the idiom, while during "grinding" refers Sanding Sheets  to the grinding.
In fact, going back to the earliest human use of grinding primitive society, in the matriarchal society, everyone has begun to use the most simple stone tools, which are the most simple stone is a stone with a simple conflict between come. We use these most simple things hunting, planting. Then of course, everyone's wearing a simple, but still have a blade's adjuvant, which is inseparable from the grinding.
When a man named Wei Cui Liang Xi creation mill, used for processing food, Jin Liujing Xuan Xi can be used together to create a functioning eight natural rock disc of stone; Tang Shi Tao presents a mill and grinds, these abrasives are Changzhi in Shanxi County, "Wang Chen," tomb unearthed. Britain at the end as early as the Song Dynasty scholar surveys exist nine  abrasive fibre disc speed grinding; thirteenth century that division in the Yuan Dynasty, Chinese people have begun to use natural gum will stick and non-metallic shell powder grinding data one of the countries, from the most primitive has been continued until the early nineteenth century, before the grinding process can be considered to carry out the first stage of history. This phase is characterized by the use of abrasives and machinery are relatively simple.

Grinding can be considered as a system engineering

including machine set the input side, the workpiece material type, operating parameters, and selection of four wheel, through the grinding process, the output is the result of grinding (surface quality, productivity and  cutting disc economic cost). Once the grinding results failed to achieve the desired results, the four factors from the input verification, rather than the wheel. Sometimes the problem is not because the wheel, but because of the workpiece material changes or fluctuations in heat cause the grinding problems, just to check from the wheel angles tend to waste a lot of time.
The wheel is not possible to use the  cut off wheel more expensive the wheel, the more expensive the more difficult to use this argument wheel, the wheel should be more applicable to the better use what is applicable, in accordance with the conditions of your machine and the material to be processed wheel design with models, to cut freely, to reach the surface quality requirements.Abrasive wheel constitute the main material, has high hardness, brittleness and thermal stability appropriate, in the grinding process of the workpiece from the cutting action; binding agent is the role of abrasive consolidation up to a certain shape of the and intensity of abrasive; pores are present in the grinding gap, grinding debris and heat capacity plays the role.

alone entities (objects) to prevent the drawbacks

Anti-matter is physical security, protection from the goal to protect the physical facilities, such as doors, windows, cabinets, locks, etc., the main role is blocking and delaying criminals committing the crime.
1, in the left and right sides retrofit  cutting and grinding disc roller shutter padlocks, gates generally larger span, the middle still can pry into the V-shaped, still not achieve real security role, furthermore need to store someone;
2, in the middle of rolling gates erected a water pipe, Chazhu beam and bottom beam forming vertical jacking force, gates generally larger span, they withstood the middle of a point, from both sides of the V-shaped pry can still enter, can also be pulled out or pushed inwards, still not achieve real security role, furthermore need to store someone;
3, in the middle of rolling gates go Sanding Sheets  trough at 1 meter drill a hole in the evening to pull down the door into the screw holes, you can piece doors are relatively weak, a page, or go breaking trough will split, still will not achieve real security role, furthermore needed someone store;
4, in the roll out of both sides of the gate padlock installation, which is now more popular, but this is obviously told the thieves shop nobody on duty, leaving the thieves cut a bold head or pry open the tambour door unlocking;
5, remote control electric rolling  gate is generally thought that the door down to pry open, in fact, forced to lift the door was  velcro disc lifted, or remote control is broken, how do? Master is so not lifted up, as well as remote string of code, the remote control is copied

Grinding technology development

Currently used in traditional ordinary abrasive granular slow grind main advantages are high precision, but also has some disadvantages in inch: such as:
1, the abrasive grinding disc is placed loose on the disc speed is not too high to avoid splashing abrasive, abrasive waste, so processing efficiency is low.
2, abrasives and grinding from the workpiece under the debris mixed together, the abrasive can not play a full role, but sandpaper roll  also to improve the processing efficiency with these often abrasive debris washed together, both to waste energy, but also a waste of abrasive .
3, abrasive grinding discs are randomly distributed, and its distribution uneven density of the workpiece material grinding cutting uneven workpiece surface accuracy is difficult to control; particularly abrasive and the workpiece relative motion between the randomness, which  also increases to see work face accuracy can not afford to identify factors that reduce the stability of the machining accuracy.
4, the grinding process, the abrasive forces cutting and grinding disc  between each other, but also the relative motion, which results in the abrasive cutting action between both abrasives abrasive, abrasive and increased energy waste.5, in the grinding process, the large size of the abrasive to withstand greater pressure, and the small size of the abrasive is exposed to a small pressure, even independent of pressure, which makes large cutting depth large abrasive particles, resulting in deep scratches, impact surface quality, so as to improve surface quality, the abrasive  non woven flap wheel loose abrasive grain size uniformity higher.
6, in the strictly controlled grinding medicine flow of coolant to avoid abrasive away, the cooling effect of variation which is easy to cause the workpiece to heat up, resulting in decreased precision machining.

Belt Product basics

(A) Basic information abrasive article
1 gum belt Item Features: Featured SiC ore, extraordinary disposal Backing paper, pressure sensitive adhesive with easy handling and disposal of anti-infarct extraordinary super coating.
(2) with alumina and ceramic alumina inclusions ore, extraordinary disposal through wet or dry paper back base, with  Abrasive paper anti-infarct super coating.
3 items with limitations and strengths: The primary use of various types of materials and polished appearance, the same is also shared with points combined for paint removal. Wet and dry on the back of the base supply two kinds of dry and wet processing methods. Extraordinary  grinding disc election sand supply a longer life.
4 items with limitations and strengths: supply fast, useful processing method, the primary material used in all  types of metal deburring, harmony and looks clean.
Belt Function characteristics:
1 because their light weight belt, and  ceramic flap disc its tectonic grinding process control system is easy to form a balanced, all reversing minimal wear and tear parts, was not that kind of action against the phenomenon of wheel balance elements;
2 belt grinding workpiece surface quality primary display in the appearance of high roughness value is small, residual stresses good shape, and appearance no microscopic cracks or microstructure changes and other phenomena.

sandpaper in the process of applying

Consumers have had to use sandpaper to sand paper will look at the use of the process easy to attack defects into two categories: First, abrasive own quality not good, two is the use of defective, select sanding roll  Carbon absurd road or equipment problems caused problems. So for this kind of question how we should deal with it?
Some type surface when machining, bending or uneven workpiece, often very soft belt hope to use. When the belt is very brittle, easily make the results not satisfactory abrasive. Belt brittle reason, in addition to soft music is not good, then there are the weather is too boring. Treatment approach is to belt it before use, try not to open the package, to prevent excessive boring, a premise, then should be placed in 15-200C, relative mini flap disc  humidity 50-60% of the cases among the belt is less brittle.
The first task is this: the belt of Burkina surface slope on the steel plate, vertical reciprocating gentle rub, rub a soft finish bias will tend to use the same belt, another way to end up and down gentle rub, can be reached tender objectives. Of course, in the production of mechanical belt Roll soft song has been carried out, this approach only  as a abrasive paper sheet  temporary remedy.Large rear Disposal: emery cloth roll out from the boring room after after disposal to go through a series of talent into the conversion process. Large rear cover themselves after curing, storage, humidifiers, soft music and so on. Disposal Through these processes, the function and quality of abrasive ability to reach the intended purpose.