Diamond wheels are used in any place

Diamond grinding wheel by the task layer structure common matrix , the transition layer composed of three parts .
Task layer , also known as the diamond layer , the abrasive , linking agent and a filler , is the task of grinding wheel
Locally . The buffer layer is also called non-diamond layer by the associated agent ( glass grinding wheel ) and a filler metal powder , convergence is well diamond layer on the substrate locally . Substrate PSA sanding disc  for receiving the abrasive layer , and in the use of clamping flange well with the grinder spindle. Common metals and refined selection of agents associated with steel, alloy steel powder as matrix ; resin -linked agent used aluminum alloys , electric wooden base . Machined from  abrasive fibre disc aluminum, steel or made ​​of bakelite , from supporting task level and chucking abrasive effect. ( Diamond tools ) black and white and using precision molding quality is uneven wheel has a great relationship with the matrix .
 Diamond grinding wheel which is mainly used in the manufacturing industry ? Currently on the market there are a wide variety of diamond wheels , because of their special characteristics of its use is also more extensive.
  So diamond grinding wheel mainly used in the manufacture of which industries ? It is mainly the use of : machining centers and grinding with diamond drill grinding and other heavy-duty cutting , grinding for glass, ceramics, ferrites , data and other brittle semiconductor materials and metal materials , shape carbide materials processing , electrolytic grinding. Grinding having good wear resistance , high efficiency and long life zirconia flap disc  characteristics to use . Due to the high hardness of diamond grinding wheels , cutting good, so wheels generally do not need trimming , but after a period of use , the chip clogging performance decline , even grinding force, grinding temperature increased, causing the wheel to crack, after plugging in the wheel , it must be trimmed , when dressing , available silicon carbide or corundum stone, diamond sharpening wheel , the method is a piece of flat silicon carbide or corundum Whetstone contact rotating diamond wheel , in the process of grinding , diamond grinding wheel due high hardness , can move as silicon carbide or corundum grinding stone, silicon carbide or corundum Whetstone will clear out the chips on a diamond wheel , diamond grinding wheel cutting restored .

Talking about the development and status of cut pieces

Speed ​​the development of resin abrasive relatively fast, whether it is growing year by year from the product in production, quality and variety, especially in recent years has become a booming good situation. Why resin bonded abrasives will develop so fast, in addition to objective conditions, such as social requirements Sik, there is sufficient raw materials ...... and so on. The most fundamental reason is that the resin binder and has unique properties inseparable. To talk about its advantages: first, it  cutting and grinding disc combines high strength. Comparison with other binders, resins have a higher bond strength at higher speeds can be used to withstand greater pressure grinding, which is widely used in rough grinding and deburring process in the steel and foundry industries. And with the improvement of the grinding process, the grinding of the cutting disc load and strength requirements are also rising, from the past hanging portable grinders and sanders to today's high-speed heavy-duty billet repair mill, cutting pieces from the past use of the speed of 35-40 m / s, developed to 80-100 m / sec, the wheel loads from the past 30-50 kg, to today's 1,000 kg or more, if No high strength bond is difficult to achieve.
 Followed by the abrasive can be  velcro disc made special shapes and special needs. This is mainly due to the binder resin at a low temperature (200 ℃ or less) hardening conditions do not change the basic properties of the material, which can be added to the different needs of the filler material embedded or ornament. In order to meet requirements such as grinding grooves and can be made with porous shaped grinding wheel, grinding wheel in order to improve the strength of the glass can be added gingham and other metal wire mesh in cutting tablets. Can be added to increase the conductivity of copper, aluminum and graphite powder. Third, suitable for manufacturing thin wheel throughout the specification. In many metal cutting and slotting processing sector has been widely used processes, to achieve the thinnest 0.1 mm, which completes the blade can not be done in general processing tasks, especially in high speed after the cutting reinforcing sheet has been widely metal cutting wheel  used, the need for the cutting wheel increased rapidly.
Fourth, the binder resin has a certain elasticity. In the grinding process, the surface roughness is conducive to meet the higher demand. In the machining process, grinding and polishing processes more choice of resin bonded grinding wheels, grinding under the same conditions, the resin abrasive finish higher than ceramic abrasive.

Abrasive polishing method described six

1, the mechanical polishing: mechanical polishing is plastically deformed by

the cutting surface is polished to remove the convex portions obtained by a

smooth surface polishing method  ceramic belt generally used Whetstone, wool wheel,

sandpaper, abrasive belt, nylon wheels, manual operation is Lord, special

parts such as body surface rotation, you can use the turntable and other

aids, high surface quality requirements can be thrown over lapping method.

Super abrasive lapping and polishing is a special abrasive in polishing

liquid containing abrasive, and  sanding paper roll pressed on the surface of the workpiece to be

machined for high-speed rotation. The polishing method is the highest age.

Optical lens mold often use this method.
    2, chemical polishing: chemical polishing is to make the material in the

chemical medium surface micro-convex and concave portions preferential

dissolution of some of the more, resulting in a smooth surface. The main

advantage of this method is that the device does not need a complex, the

complex shape of the workpiece can be polished, many workpieces can be

simultaneously polished, high efficiency. The core problem is formulated

chemical polishing polishing solution.
    3, electrolytic polishing: electrolytic polishing and chemical polishing

the same basic principle, namely by selectively dissolving the surface of

fine convex portions, the surface smooth. Compared with chemical polishing,

can eliminate the impact of the cathodic reaction, the effect is better.

Electrochemical polishing process of  coated abrasive leveling the macro and micro leveling.
    4, ultrasonic polishing: the workpiece into the abrasive suspension and

placed in an ultrasonic field together, relying on the role of ultrasonic

oscillations, so that the abrasive grinding and polishing the surface of the

workpiece. Ultrasonic machining macroscopic force is small, does not cause

deformation of the workpiece, but the tooling fabrication and installation

more difficult. Ultrasonic machining can be combined with chemical or

electrochemical methods. In the etching solution, based on the electrolysis,

the solution was stirred and then applying ultrasonic vibration to the

workpiece surface from the lysate, or near the surface of the electrolyte

uniform corrosion; ultrasonic cavitation in a liquid is also possible to

suppress the corrosion process, in favor of the surface luster.
    5, fluid polishing: polishing fluid is relying on high-speed flow of

liquid abrasive scouring and polishing the surface to achieve the purpose of

carrying. Common methods are: silicon carbide abrasive jet machining, liquid

jet machining, grinding fluid power. Fluid energy mill is driven by hydraulic

medium that carry high speed abrasive liquid flow through the reciprocation

of the workpiece surface. Medium used mainly in low pressure flowing through

specific compounds and mixed with good abrasive made from silicon carbide

abrasives abrasive powder can be used.

Several conditions abrasives

The abrasive article has a modern conditions without resistance, in the first condition for the workpiece material, the shape, the processing method, etc., and then the conditions of the grinding machine tool rigidity, the abrasive seismic, on the required accuracy, then grinding process parameters, speed lines, process parameters depth  PSA sanding disc of cut, workpiece size, and finally the job status manually on the machine, motor status, conditions of trim, depth, feed several. Now people in the market to see only material hard abrasives, stylish, than ever abrasive already have greatly modified. Now fast approaching in which people's lives, every step of the abrasive production steps are rigorously checks, after processing several conditions will not allow unqualified mold them into the market, so Consumers buy  Mounted flap wheel the rest assured with peace of mind. Choice for abrasive concentration
  Our abrasives increasingly thrive, constantly seeking new highlights innovation, so that more and more consumers are concerned about the.
  The concentration of the mold should be how to choose?
  Mold species concentration is binding agent, the particle size of the geometry of the requirements on the process. For the different type of binding agent used in the different ranges, if it is the same in terms of a binding agent, the concentration in general is higher than the diamond die, most of the class with the steel toughness, hardness and strong, thereby  cut off wheel reducing the concentration on a little, so as to achieve a concentration of some of the requirements.
 Abrasives are molded from production to strict inspection before the market, the design has changed from the past, those styles are a new look to this new era.

Abrasives and abrasive products typically include two types of superhard abrasive materials

Abrasives and abrasive products typically include superhard abrasive materials into two categories . Ordinary ordinary abrasive grinding abrasive means made ​​of superhard abrasive material is abrasive diamond, cubic boron nitride and other superhard materials. Abrasive abrasive bound form by ordinary into bonded and coated abrasives , abrasive paste . In abrasive , a binding agent used in accordance with the different points abrasive fibre disc  vceramic abrasive, abrasive resins , rubber, abrasive, magnesite abrasives and other categories. In coated abrasives , the adhesive can be divided according to different categories . According to different grinding can be made ​​use of different basic shapes and characteristics , whereby can be divided into different categories , such as can be made of abrasive grinding wheels, grinding , stone, sand tiles , polishing block and so on. These different types of abrasive and have a different shape , the first shape and the type of abrasive grinding series combination of different binding agents into different varieties. Each species of different sizes and different characteristics constituting ceramic belt  the abrasive and combined into a variety of specifications .
 Bonded Abrasives manufacturing process are: distribution of material , mixing , forming, heat treatment, machining and inspection . With different binding agents , manufacturing processes are not the same. Vitrified abrasives used mainly -pressure method , the abrasive and binder weight ratio formula weighing, mixing evenly placed within the mixer, put in a metal mold in the press molding of abrasive rough . Blank firing kiln dried and then into the firing temperature is generally about 1300 ℃. When using a welded low-melting binder, the firing temperature is lower than 1000 ℃. Then the provisions of the exact size and shape processing, final inspection products. Resin bonded abrasives are generally molded in the press at room temperature , there is also pressurized with heating in a hot-pressing process under heating conditions . After forming in the hardening furnace hardening . The phenolic resin as binder, the curing temperature is 180 ~ 200 ℃. Rubber bonded abrasives used mainly for mixing roll machine and rolled into thin slices, then use a die cutter punching molding ; also some with loose material, into the inner metal mold press forming. After vulcanization molding vulcanization tank , a temperature of 165 ~ 180 ℃. Metal bonded abrasives manufacturing process , there are two powder metallurgy and plating method , mainly for superabrasive abrasive . Bronze powder metallurgy as the binding agent , or after mixing by hot abrasive fibre disc  press molding at room temperature , and then sintering processing. Plating with nickel or nickel-cobalt alloy as the metal plating , according to the abrasive bonded to a plating process on a substrate made ​​of abrasive.
Special varieties of sintered corundum abrasives and grinding with abrasive fibers and so on. Sintered corundum abrasive is alumina powder and the amount of chromium oxide mixing, forming , sintering at about 1800 ℃. This abrasive compact structure , high strength , mainly used for processing watches, instruments and other parts. Abrasive fibers are adhered or containing abrasive filaments ( eg nylon ) as the raw materials made of , its flexibility , materials and products used in metal polishing .

Coated Abrasives Grinding basic knowledge of some simple introduction

1, coated abrasives grinding points and Scope Coated Abrasives is a flexible abrasive from the abrasive substrate and binder made. Efficient cold cutting object point coated abrasives grinding grinding flexible, widely used:
(1) large flat thick, thin sheet, including processing metal strip;
(2) mass production of a variety of  Sanding Sheets metals, non-metallic workpieces; (3) complex surface of the workpiece forming grinding and polishing; (4) metal pipes of various diameters, rods, cylindrical grinding roll material curved surface grinding, internal grinding, etc..
(5) the use of a wheel or drum sand cover page can replace buff polishing; 6) discoid products are used in large-scale housing, box, hull, bridges, etc. weld grinding, deburring, rust and other aspects of a large area, efficient, convenient and safe. 2, the grinding mechanism of belt
 Coated Abrasives can be understood as a multi-tool knife multi-blade composed of many grains. Coated Abrasives grit is evenly distributed in the surface of the substrate, essentially single distribution. Coated Abrasives special abrasive used, the basic requirements of a high  grinding wheel manufacture clay content, uniform particle size, so that the surface of the abrasive coated abrasives have a good high order. In particular, the production of coated abrasives modern electrostatic sand-planting process to ensure sharp outward abrasive, abrasives orientation. Coated Abrasives abrasive surface and contour given pumping arrangement, and is an important factor in high efficiency and cold grinding coated abrasives to keep grinding. Typical is the difference between grinding wheel "with a belt grinding surface by increasing vertical loads (grinding pressure), rather than by increasing the belt speed to develop.
Belt line speed usually within 15-35 m / s range, rarely more than 50m / s.
 Belt during the grinding process, the occurrence of three different processes: Swipe - abrasive swipe on the workpiece, resulting in elastic deformation of the workpiece material, plows - abrasive plastic flow caused by the workpiece material, so Materials produced and squeeze as moving forward from the bottom and sides of extruded grains, while removal abrasive paper sheet  of a small amount of material; cutting - material produced fracture in the formation of chips in front of the slide, there is quite fast removal rate. The above three processes are connected to each other, wherein the cutting process is grinding the most effective form.

Organic abrasive shellac was done with natural binding agent

Organic abrasive shellac was done with natural binding agent , later with the artificial resins , organic abrasive , it has rapidly developed. Worldwide production of resin and ceramic abrasive grinding ratio is more than 1 : 1 , now the trend is still growing . Resin abrasive so rapidly development , has the following characteristics aspects:
1, high bond strength , such as the abrasive fibre disc  use of high-speed cutting wheel line speeds of up to 80-100m / s, heavy duty grinding wheel load of about 50kg up to 1000kg past over . 2 , easy to adjust the structure and properties of hardened resin abrasive temperature is only about 200 ℃, ceramic abrasive than the firing temperature of 1300 ℃ lower, and therefore can be abrasive ornament network Plaid , wire, graphite, Lo caps and other materials to meet the needs of different grinding . Many properties of the filler can maintain the abrasive is made , the filler can be changed using different abrasive performance in a wide range of discharge . 3 , resin grinding with a certain degree of flexibility , help to improve the finish of the workpiece to be machined , the choice of graphite , chromium and other polishing materials for the filler can be further reduced roughness.
4 , easy to burn the workpiece processing , resins in the 230 ℃ gradually charring temperature processing partial carbonization of the resin to produce self-sharpening , grinding improved sharpness and thus also reduce the grinding temperature to avoid burns the workpiece.
5 , the resin has excellent moldability , but also good toughness , which can be made with a thickness of about 0.1mm sheet wheel for cutting slot . 6 , resin abrasive production cycle is short , simple equipment , less investment and quick . The start of many products Abrasives Factory 7 , resin abrasive poor water resistance , alkali resistance is poor, short shelf life , its shortcomings, the production and use should be note 8 , for the manufacture of a large number of resin abrasive cutting wheel, cymbal -shaped grinding wheel , heavy-duty wheel , roll polishing wheel , graphite  metal cutting wheel mirror grinding wheel , conductive grinding wheel , honing wheel, soft polishing wheel and so on.
2 resin abrasive structure and nature one , resin grinding abrasive structure commonly referred to as the three elements of the five factors mainly ceramic abrasive object in terms of resin abrasive six factors should be four elements , four elements are abrasives, binders, filler materials and ornament embedded pores ( 1 ) abrasive as cutting edge , cutting tools, grinding tools is a major component . ( 2 ) abrasive particles and binder binding agent plays a role into the filled and ornament materials, so that the abrasive can be molded ( 3 ) filler material ornament embedded abrasive impart various unique properties such as conductivity , and the use of polishing with mounting holes in the abrasive than other structures , such as the wheel bolts ( 4 ) having an internal porosity is the porosity of the abrasive , and contribute to the cooling effect of the second chip , the abrasive properties of the resin
Resin abrasive performance is determined by the resin abrasive six factors , six factors are : abrasive material, abrasive particle size , binders ( resins ) performance, abrasive hardness , abrasive filler material organization and performance . ( 1 ) There are a variety of abrasive materials such as corundum abrasives , white fused alumina , black silicon carbide, green silicon carbide , different abrasives have different properties, for the needs of different grinding objects , but also determines the abrasive performance.
( 2 ) the same grit size of the abrasive grit different for the accuracy of the workpiece to be machined , roughness, processing efficiency and other aspects have significant impact. ( 3 ) a binder  resin, various adhesive strength, heat resistance , abrasion resistance and stability are different, the type of the resin used as the binding agent are different abrasive performance . ( 4 ) the hardness of different materials of different quality and processing of the workpiece hardness abrasive have different requirements , and hardness have a great influence on the efficiency of the processing ( 5 ) organized tissue abrasive grains in the abrasive used in the abrasive expressed as percentage of the volume occupied by the abrasive grains account for a large percentage of the volume of pores less abrasive , abrasive grains accounted for more than the volume percentage of small pores , the abrasive grinding tissue indirectly reflects the number of pores , it correspondence is not equivalent to the size of the porosity , which is should be noted that ( 6 ) packing the resin hardening temperature is low abrasive , so abrasive made ​​after mixing when adding some filler remained of the original features such as copper , graphite conductivity, polished performance of certain fillers and high resolution performance and so affect the properties of the abrasive , it is no less resin abrasive for this sixth factor ( 7 ) in addition to the above decision six factors outside the abrasive performance , the performance of the manufacturing process in a number of over- generated , such as balance and geometric precision , also has a great influence on the abrasive quality. 3 resin  sanding roll bond grinding resin used as a binder resin with the requirements : ( 1) a strong binding ability of abrasive . ( 2 ) has a higher heat resistance. ( 3 ) has a high tensile strength, compressive strength, impact strength. ( 4 ) has good processing properties and manufacturing . Common resins having these characteristics include: phenolic resin, epoxy resin , phenol resin, new , bismaleimide resin, polyethylene amine , polyvinyl acetal . A phenolic resin, a phenolic resin from phenol and formaldehyde in the presence of an acid , an alkali catalyst to effect the synthesis . Since the process can be made of different materials the two liquid resin and powdered phenolic resin, a phenol , a phenol resin manufacturing ( 1 ) phenol , also known as carbolic acid phenol , white colorless needles , pale pink oxidized in air . Phenol can be dissolved in water , soluble in alcohol, alkali , etc. There are acidic, easily penetrate the skin , causing allergies. About 2% phenol aqueous solution of soap used for disinfection , medical name " Lysol children " ( 2 ) Formaldehyde is a colorless gas , for the manufacture of phenol formaldehyde resin is an aqueous solution .

Ceramic corundum abrasives and abrasive characteristics analysis

In machining technology continues toward high-speed, high efficiency , and high-precision direction of development , the application of titanium alloy, high temperature alloy stainless steel , high- strength steel and ultra-high- strength steel , composite materials, engineering ceramics and other hard materials are also increasing. High-tech needs of both traditional areas makes grinding wheel corundum and silicon carbide grinding wheel is sometimes difficult to meet production needs, must use stone cutting wheel  the new abrasive wheel to meet demand. Corundum , silicon carbide, diamond and CBN grinding wheels compared to four kinds of abrasives , diamond gradually replace silicon carbide , cubic boron nitride gradual replacement of corundum has become an inevitable trend. But for machining hard materials, because of their brittleness , toughness and ductility large , the hardness is high ( high hardness , or in the presence of a base in a large number of hard particles ) , chemical activity , high temperature strength characteristics, so that the when grinding more difficult , there grinding force, grinding , high temperature, abrasive wear fast , low grinding efficiency, work hardening and serious phenomenon that diamond and CBN abrasive own merits and can not meet such grinding needs. Some  zirconia flap disc new abrasive due to its high toughness , self-sharpening , good benefits, it played an important role in grinding difficult materials , including ceramic corundum abrasives ( also known as microcrystalline corundum abrasives ) appeared to become the highlight of the grinding . 2 Features and application of ceramic corundum abrasives
Ceramic corundum abrasives ( also called microcrystalline corundum abrasive ) is a new aluminum oxide abrasive , corundum and corundum which maintains the high hardness and wear resistance properties , but also has high toughness , easy to change corundum broken disadvantage that has the characteristics of toughened alumina ceramic , which can be widely used in the manufacture of coated abrasives and abrasive . Preparation of ceramic corundum abrasives shown in Figure 1 . Compared with fused alumina abrasive except that different materials and different preparation process . This method uses an aqueous alumina raw material by the sol - gel process for the synthesis of submicron grains (0.1μm ~ 0.2μm) of the corundum crystal structure and prepared by sintering a ceramic microcrystalline corundum. Compared with ordinary corundum abrasives , ceramics and corundum abrasives only high hardness and abrasive microcrystalline structure because it has a lot of crystal solution surface . Grinding or dressing , when dressing , ordinary fused alumina abrasive grain surface along transgranular fracture , showing macro broken ; ceramic corundum abrasives rupture along the grain boundaries , showing microscopic broken, continue to produce sharp cutting edge , self- sharpening and peel less . With its production of grinding wheels with anti- clogging , high abrasion resistance , grinding heat , long life, high rate of removal , grinding and grinding quality is better than the big advantages . It retains the advantages of SG , with breakthroughs in the abrasive shape , there is a very thin rod-like crystalline structure , difficult to machine materials suitable for creep feed grinding and machining Inconel , high-temperature alloys. TG abrasive grinding abrasive material removal rate in the corundum 2 times , seven times the life of  portable belt corundum . Process for preparing ceramic corundum abrasives can microcrystalline alumina abrasive and diamond, cubic boron nitride and other expensive high-grade abrasive combined without reducing the performance of the premise, significantly reduce costs , it can also be white corundum, corundum abrasives and other low-level combine to dramatically improve its performance . So microcrystalline corundum abrasives is a very good application prospects abrasive, currently microcrystalline variety of abrasive corundum abrasives prepared in the aerospace , automotive, mechanical, optical , bearings, tools, molds, and other fields have a wide range of applications .

suitable for hand or machine grinding mill

 Sponge sandpaper is a mobile phone casing surface as the most highest utilization rate should be polished and abrasive applications such as Foxconn, Pegatron, Huawei, prestige, accessible, BYD and other large mobile phone shell grinding plant, especially for like iphone, sansung, millet various processes such as cell phone case polished surface. Since 2006, the sponge sandpaper polished by the patch applied to the portable belt  model to move to the best cell phone case sanding sandpaper after mandatory from the initial 3M sandpaper sponge, NORTON sponge sandpaper, LUCKYSTAR sponge sandpaper and other imported original products in the market three pillars, due to imports high cost, long period of goods, factories continue to reduce production costs to pursue slowly emerged on the market over the possessions brand developed the production of sponge sandpaper, of which the trader abrasive sanding belt  profits abrasives plant produced DLC sponge sandpaper sandpaper sponge in the domestic more prominent, and its products using, corundum, silicon carbide, white fused alumina, zirconia alumina abrasive such as a substrate with the best quality of the binder coated sponge, sponge sandpaper all in strict accordance with the production process for production abroad, not only cheap, quality is more and imported sponge sandpaper same, Since the product launch has been a number of large enterprises to adopt on the phone casing polished product with a high temperature, acid, etc., suitable for hand or abrasive wheel  machine grinding mill, but also in accordance with the requirements of any  customer, any model tailored to fit the needs of the sponge sandpaper, separable cut long or round, gum, back velvet different sponge sandpaper, grit 120-180 thickest and most fine of up to 3000-4000 or finer, and the other to provide OEM customized business.

What superhard abrasive materials manufacturing formula is

Abrasive formula design based on the use of performance and processing requirements , is to create high-quality abrasives afternoon to link.
A recipe formulation design principles must follow the following principles . 1 . Formulation to meet the requirements for use . 2 . Formulation to ensure that the possibility of the manufacturing process. 3 . Rich source of raw materials used , low prices. 4 . Manufacture and use of the process, people and the environment as much as possible does not produce mini flap disc  harmful effects. Second, the formulation process of molding resin bonded abrasives molding , thermoforming generally used method , ie the process by pressing the upper and lower pressure thermal conductivity of the mold extreme heat, melt the bonding agent , and to maintain a certain pressure, in a certain time, so that condensation cured , it is not easy to foam or abrasive layer from cracking and to maintain the density , hardness and bond strength matrix abrasive . Small diameter products can be used for cold molding methods . Curing ( hardening ) of the thermoplastic phenolic resin and hexamethylenetetramine , in the preliminary compression molding has become a thermosetting phenolic resin, the article has a certain strength and hardness, but since the pressing time is short, curing is not sufficient , yet the quality of the product meet the requirements of the use of grinding , and therefore must be the second curing temperature and time control , the plastic resin , the free phenol and hexamethylenetetramine curing reaction proceeds sufficiently , does not melt completely into insoluble thermosetting resins. Curing equipment cured resin  abrasive flap disc bonded abrasive equipment is relatively simple , the most used electric oven drying , the drying device is a drying chamber using double metal sheet made ​​of laminated with asbestos , aluminum silicate, and glass fiber insulating insulation material fill. When powered on, the heat resistance wire heating oven bottom , so that the inside of the wheel heat curing . However, this part of the bottom of the drying chamber is heated , the heat flow increase , relatively high temperature for curing the resin bond products commonly used drying box oven with a blower device , which can heat the air in the officer by mechanical action , convection to keep the temperature as even as possible . Using electrical contact thermometer temperature measurement point in the box upper part , so as to be loaded inside the article installed in the position of the intermediate layer . SBC device temperature can also be used to control the temperature , the recorder can be observed through the whole process of heating curve to determine the amount due to the number of installed furnace caused narrow belt  by changes in temperature speeds. Determining the curing temperature curing temperature is the maximum temperature is determined according to different kinds of resins . Phenolic resins such as the maximum temperature to 180 - 190 ℃ appropriate, below this range, the curing is complete , the bond stability  is poor , above this range , adverse effects on the mechanical properties of the article , the article makes the hardness, strength reduced consumption, or even lose value as scrap . Therefore, the phenol resin curing temperature was 185 ℃ ± 5 ℃. The polyimide resin is 230 ℃. Determining a heating rate of temperature rise rate is determined according to the characteristics and shape of the abrasive determined . Resin binder in the press has a short curing , has 85% - 95% of the thermoplastic resin becomes a thermosetting resin , mine heating rate at 100 ℃ before you can quickly ,100 - 140 ℃ may be slower ,150 - 185 ℃ accelerate and proper , but in the insulation, the discharge time may be longer, a polyimide resin , a high temperature pre-polymerization , the temperature at 180 ℃ freely before the temperature slowly after 200 ℃ , holding time is appropriate to put long.

the use of different types of sandpaper when buffing direction

Polishing sandpaper sandpaper polishing must be noted that the problem is one of the ways mechanical polishing, therefore, the use of any kind of mechanical polishing polishing process which are very focused on some of the problems in the process, sandpaper, polishing is no  quick change disc exception, then sandpaper polishing in the application process issues that need attention are those who do? Look at the following three normalized within: 1, must stick with a soft bamboo stick, because in the circle on the spherical surface polishing, the use of drinking stick bamboo stick round face can be better co-ordination and spherical curvature. Conversely, hard wood is suitable for flat surface polishing. Trim the ends of the stick with the steel surface can make it fit shape retention, so to avoid wood or bamboo acute angle caused by contact with the surface of steel deep traces. 2, the use of different types of sandpaper when buffing direction should be suitable angle transformation. This  sandpaper can distinguish between before and after polishing with different abrasive stripe shadow effect left. In sandpaper before changing to a different model, preferably with a 100% cotton dampened with alcohol-based cleaning fluids on the polished surface be carefully wipe, since it is often a little sand left on the surface will destroy the entire polishing work goes on . Polishing process is very particular about cleaning the entire surface, a variety of different sandpaper transform, you must pay attention to this point. 3, in the polishing process, often a lot of time in order to avoid abrasions and burns the  ceramic flap disc surface, so the use of # 1200 and # 1500 sandpaper polishing careful when you place grid. Anyway, with each of the different types of sandpaper polishing, to be used in two different directions, for different angles of the polishing. To avoid scratches during polishing and burn phenomenon.