Surface grinder grinding wheel selection

Abrasive wheel is a grinding tool indispensable to select the appropriate wheel or not, influence the quality of grinding , the grinding costs important condition . Many types of wheel , and a variety of shapes and sizes due to the different abrasive grinding wheel , grinding wheel binder material and the manufacturing process , the wheel having  non woven flap wheel a variety of different performance. Each wheel according to its own characteristics, has a certain scope. Therefore, grinding, must be based on the specific circumstances ( such as the material properties of the workpiece grinding , heat treatment method , the workpiece shape, size and processing forms and technical requirements , etc. ) , choose the appropriate wheel. Otherwise they will be directly affected by improper wheel to select the machining accuracy , surface roughness and production efficiency. Wheel to select the basic principles are listed below for reference.
 Black silicon carbide wheel: black silicon carbide is brittle and sharp , high hardness than corundum white , suitable for grinding lower mechanical strength of the material , such as cast iron , brass, aluminum and refractory .
Green silicon carbide wheel: darker green silicon carbide SiC high hardness brittle , abrasive sharp, good thermal conductivity, suitable for grinding carbide , optical glass , ceramics and other brittle materials.
Chrome corundum grinding wheel : high  ceramic flap disc quality requirements for surface finish of the workpiece grinding tools, measuring tools , instruments, and other threads .
Monocrystalline corundum wheel : suitable toughness , high hardness material grinding stainless steel, high speed steel and vanadium burns easily deformed workpiece .
Microcrystalline corundum wheel : suitable for grinding stainless steel, bearing steel and specialty ductile iron , etc., for molding grinding, cutting mill , mirror grinding.
Corundum wheel: Olympic Di suitable for grinding stainless steel, titanium alloys , heat-resistant alloys, especially suitable for heavy duty grinding.
 2 particle size depends on the choice of the surface roughness of the workpiece to be ground and the grinding efficiency.
Granularity refers to the size of the Mounted flap wheel  abrasive particles , whose size is represented by particle number with a time of coarse-grained grinding wheel , high production efficiency, but the surface is rough grind ; using fine-grained grinding wheel , the workpiece surface grind better roughness and lower productivity. Meet the requirements under the premise of roughness , should try to use coarse-grained grinding wheel to ensure a high grinding efficiency . Generally coarse grained wheel selection , the selection of fine-grained grinding wheel when grinding . When a larger contact area when the grinding wheel and the workpiece , to use some of the rough wheel size . For example , the same surface grinding , face grinding wheel with a wheel of granularity than the surrounding ground to choose thicker .
 3 depends on the hardness of workpiece material selection is grinding , grinding efficiency and surface quality . Hardness is the degree of difficulty falling abrasive wheel under external force , in order to adapt to different requirements for grinding the workpiece material into different wheel hardness grades manufacturing . Wheel election was tough, blunt abrasive easy to fall off , easy to plug the wheel , grinding heat increases, the workpiece easy to burn, low grinding efficiency, impact surface quality ; wheel selected too soft , abrasive when it was still a sharp fall increased wheel loss is easy to lose the correct geometry , the impact accuracy of the workpiece . Therefore, the hardness of the wheel to select the appropriate , should be based on the size of the contact area between the grinding wheel and the workpiece , the workpiece shape , way grinding , cooling, binders and other types of wheels factors considered.

Matters wheel in place before the inspection and installation should be noted

First, install the front wheel in place before the check in place, with the visual inspection method or using sound test method to check the confirmed cases of damage or injury to the existence of the grinding wheel to be installed, as well as checking grinder (or machine) and Wheel of speed between matches. Check the wheel in place prior to note the following:
A first wheel by visual inspection of  abrasive fibre disc the inspection. Visual inspection method: All wheel before use must be visually inspected and, if damaged, do not use. 2, if necessary, use sound test method for further confirmation. Sound Inspection Act (also known as the percussion test): vitrified grinding wheel before use advanced sound check. If the wheel five crack, then crackled, and vice versa issued or hoarse voice muffled. 3, is not allowed to have cracked or damaged wheel onto the axle in place, it will not only dangerous, but will also cause the appearance of precision grinding workpiece great deviation. 4, is not allowed due to covet fast pursuit of speed, wheel over wheel when using the defined maximum safe use of speed. 5, the use of the process, we should always proofread machine speed grinder or whether those indicated under the wheel speed or equal to the maximum safe use. Found nothing wrong to make timely adjustments. Second, install the  Grinding wheel china correct wheel when the wheel is installed in place is extremely important step for safe and effective use of the wheel, the wheel must be in place to ensure the implementation of the staff has considerable practical professional level.
A wheel spindle must straight, smooth, clean, non-destructive; spindle dimensions must allow tolerance range.
2, is not allowed to force the wheel mounted on the spindle of the grinding wheel, or any change in the aperture. If the spindle does not match the aperture wheel, please choose another size matching wheel. 3, the wheel must be free or attached to the spindle flange. 4, flange, chuck clamping surfaces must be smooth, clean, and the outside diameter of at least not less than one third of the wheel diameter. 5, flange  zirconia flap disc flatness require periodic measurements. Right flange flatness should be within 0.01mm of, if there is flatness tolerance, you need to perform maintenance on the flange. 6, does not allow the use of clean, unbalanced, with a burr or a different size, different flange concave pattern. 7, for multi-point fastening flange, be careful not to tighten the screws too tight.
8, for multi-point fastening flanges should be based machine manufacturer recommended torque flange size fastened firmly and evenly on the wheel. Note that when installing screws and nuts tightness, and not pressing enough to drive wheel slippage is appropriate. When multiple screws should be tightened diagonally order, fractional gradually tightened, conditions should be used to force wrench.

What is the role of pneumatic grinders

Tool pneumatic grinder, also known as pneumatic grinder, also known as pneumatic polishing machine, things have different characteristics, but a lot of people put the same thing, gave different from the "name", it is called is not Like, causing confusion in the market now, people Kunshan Industrial Equipment Sales Ltd. Garnier also according to become great distress, so far, the customer asks products, we would ask is filled with  abrasive fibre disc sand? Ball of wool? Or wheel? After that we can determine a good detailed description of the product to the customer, the customer is now fit for the machine.
  Features:
 Pneumatic grinding machine - pneumatic grinder, also known as pneumatic grinder, the site is divided into one inch, two inches, three inches, five inches, six inches. The machine is mounted above the sand, burrs can be effectively polished off, and scars, has a polishing function. There is a 3-inch pneumatic grinder, he can water, adjust the speed and the Grinding wheel china  amount of water available for marble, granite grinding and polishing, stone crafts fine grinding, grinding, polishing.
 Pneumatic polishing machine - pneumatic polishing machine known as: pneumatic polishing and waxing machine. Loading site is divided into three inches, five inches, six inches above the machine wool ball effectively can grind out the loot for car polishing, waxing, and some for cleaning glass, manufacturing, depots, car, equipment factory for polished, polishing, waxing, chamfering, metal surfaces, plastic surfaces and other cutting wheel  materials were in line with polished or painted surfaces and waxing.
 Air Grinder - Pneumatic grinders site is divided into two inches, four inches, five inches, the machine is equipped grinding wheel, power much larger than the grinding machine can be used for: manufacturing, foundry industry, foundry industry solder polished, burr removal, exterior plastic grinding, polished or space-constrained joints and burr removal job

Abrasive abrasive abrasive material is subject

Abrasive abrasive material is subject . When using abrasive for grinding, and it plays the role of the cutting edge. In the various elements constituting the abrasive , which is a key element of the abrasive grinding ability .
Physical and chemical properties of  Sanding Sheets the abrasive abrasive manufacturing process also has a major impact , because the ceramic abrasive require firing at high temperatures , and thus part of its abrasive quality indicators project (such as chemical composition, magnetic content , etc. ) requirements compared other bonded abrasives are more stringent. In order to ensure product quality ceramic abrasive and avoid possible waste, abrasives factory abrasive into the plant needs to make the necessary physical and chemical testing , confirm its compliance with the relevant national standards, can be put into production . Hardness refers to the  abrasive sanding belt degree of difficulty abrasive grit abrasive surface under loads from falling . 1 , in general, the hardness of the grinding wheel for grinding soft hard workpiece to the grinding wheel hardness harder than the soft workpiece . 2 , grinding , large or feed large contact surface of the workpiece and the abrasive , the abrasive hardness of the election should be softer . When forming grinding , in order to ensure the accuracy of the workpiece geometry , may be  Non woven flap wheel appropriate to increase the abrasive hardness.
3, the poor thermal conductivity of the workpiece and the grinding sharpening tool , in order to avoid burns , annealing, select softer abrasive hardness . 4 , when the high-speed grinding , abrasive hardness should choose softer ; dry grinding abrasive hardness ratio should be used for wet grinding softer ....

Some described the characteristics of coated abrasives

Coated Abrasives is machined from a substrate, adhesives, abrasives and abrasives made. She has good flexibility, adaptability. It points with manual, semi-manual and machine three. The major products are handmade by our daily see page dry scrub cloth, dry abrasive paper, and water sandpaper; most semi-manual with the product is shaped  abrasive fibre disc products, round, chuck wheel, flap wheels , and a variety of flowers of various grinding disc; main products are all kinds of machine belt, she can wear flat, vertical surface, surface and even job objects of various shapes. Because of her grinding up to 2500mm face even larger, which is difficult to compare any kind of abrasive. Therefore, grinding, she's the most efficient. Coated Abrasives extremely versatile, she can either processing metal, wood, leather, glass, building materials, plastics and ceramics can be processed. She can also be used for dry grinding wet grinding. In recent years, its use has penetrated into many aspects of people's lives, to become the most widely used applications for a class of abrasive, abrasive industry is a powerful force potential, with annual  Grinding wheel china sales in developed industrial countries has been ranked three categories Abrasives (coated abrasives, bonded abrasives, superhard abrasive) in the first, in our country is bound to play a significant impact on national economic development.
Abrasive custody
After receiving the abrasive grinding using the unit should be carefully checked for cracks and other damage, and carefully check the abrasive surface of the trade mark logo is correct, clear and complete. Abrasives in handling should be handled with care to prevent vibration and impact, and to prohibit rolling on the ground.
Abrasives should be stored away from  cut off wheel moisture, cold, room temperature should not fall below 5 ℃. Resin abrasive contact with alkali substances can not, should not rubber abrasive contact with the oil, so as not to reduce the hardness and strength. When wheel stacked, stack height generally less than 1.5m. Thin wheel should be stored to prevent deformation. After storage for more than a year, should be re-inspected rotation strength before use.

New, efficient, dedicated , heavy-duty strength and precision grinding of inorganic polymer production Exploration

Efficient grinding technology is a necessary condition for advanced manufacturing technology , completely solve the traditional precision grinding , inefficient processing limitations in obtaining high efficiency, high precision , while a variety of materials and shapes can be abrasive fibre disc  high surface integrity and reduce processing costs . Under China's current conditions , strengthen the research, promotion and application of efficient grinding technology, the level of China's machinery manufacturing industry to improve processing and accelerate new product development has great significance . Today, the increasingly widespread use of superhard materials , implementation of high-speed and efficient processing of superhard materials and grinding is the preferred process difficult to cut materials. Since the development of superhard abrasive applications, high-speed, high- precision machine tools and CNC technology development , new grinding wheel dressing and other fluids and related technologies , high-speed ultra-high speed grinding technology and high efficiency grinding , grinding, automation and development of intelligent technologies make high efficiency abrasive machining in machinery manufacturing field has a more important role , with good prospects for development. Efficient grinding wheel should have a good wear resistance, high precision balancing , crack resistance , good damping properties, high stiffness and good heat resistance, mechanical strength and be able  abrasive paper sheet to withstand high cutting force during grinding and so on. Efficient grinding wheel can be used corundum, silicon carbide , CBN, diamond abrasive . Under suitable binding agent and the conditions of advanced manufacturing technology , production speeds of up to use abrasive 125m / s.
Existing vitrified wheel water, oil, acid, alkali corrosion , to maintain the correct geometry. Porosity big , grinding rate, greater strength , toughness, flexibility, vibration resistance is poor, can not withstand lateral forces , V wheel <35m / s grinding , this combination agent most widely used, can be made into a variety of abrasive for shaping existing strength resin bonded grinding and grinding threads, gears, crankshafts and other large and elastic , not afraid of the impact that can work at high speed . Friction polishing effect, but strong resistance and heat resistance than vitrified poor, not acid , alkali, porosity is small, easy to plug ; V wheel > 50m / s high-speed grinding , grinding wheel can be made thin slot edge grinding tool rake face , high-precision grinding. High strength inorganic polymer bonded abrasives , and therefore have a higher usage rate generally applicable to high-speed cutting, grinding shortage , heavy duty grinding ; addition of inorganic polymer binder mill has a certain elasticity , heat and binders high , grinding self-sharpening , so compared with traditional resin binder wheel corners to maintain good , good shape retention , but also for grinding, such as thread grinding , molding grinding, sharpening ; can say inorganic polymer binder having both ceramic abrasive performance, but also a resin having abrasive properties , while avoiding their drawbacks.
Inorganic polymer binder abrasives , grinding theory is based on basic and applied research, the concept is introduced into the abrasive composites production , the following aside inorganic polymer binders basic principles of physical chemistry (1 crystal chemistry of inorganic polymer material 2 . inorganic polymer materials thermodynamics 3 . process kinetics of inorganic polymer materials ) and to introduce the interface and toughening mechanism of composite materials , inorganic polymer binder specific about the new , efficient, dedicated , heavy-duty strength and precision abrasive production applications. While this advanced technology has gradually mastered the industry for a number of tools , but there are still a number of specific issues have yet to be conscientiously sum up experiences , study and solve . Here is the specific design principles and methods of inorganic polymer binder abrasive production , production of inorganic polymer composite high-speed heavy-duty grinding , abrasive grinding shortage , strong abrasive grinding , high efficiency deep grinding , creep feed grinding cutting abrasive, abrasive grinding quick points , efficient grinding abrasive, abrasive spindle and bearings , high efficiency grinding machine grinding , rail grinding abrasive, abrasive belt grinding process for mentioning some opinions . An inorganic polymer bonded abrasives design principles and methods
In the design and manufacture of the grinding wheel should consider the following questions: First, consider the performance of precision materials processing and materials processing surface , and then select the appropriate abrasive , abrasive grinding grain size and mixed use . Followed by a variety of stress conditions , impact resistance , speed, temperature , processing materials and abrasive grinding wheel life working conditions zirconia flap disc  and choose a suitable binders , accessories , etc., and consider matching and scientific process between each other. Abrasive bond strength depends on the performance of the manufacturing process and abrasive grinding specifications. Considering factors that affect abrasive strength are: abrasive types , size, type and performance bond , abrasive hardness, organization , density, mixing, molding and curing conditions , abrasive shape , abrasive wheel outside diameter aperture the ratio . Wherein after the abrasive characteristics and specifications given , the most important binding agent performance, mixing and curing process molding process conditions . Another grinding wheel is also an important parameter ratio . Above factors involved , here we come eleven talk :
Combination of abrasive abrasive substrate and the extent and thickness of abrasive particle size distribution
Abrasive degree of thickness - is the size of the abrasive type , the degree of the overall thickness of the mix ; particle size distribution refers to a combination of different types , sizes, and quantity ratio or with abrasive conditions . Is an important factor from the abrasive grinding action of the abrasive , the abrasive nature of the workpiece according to the choice of the main materials, such as hardness, tensile strength , toughness, etc. to determine the selected abrasive basic principle is : high grinding the material hardness of the workpiece , you should choose a higher hardness abrasive ; grinding high tensile strength of the workpiece material should be used in large toughness abrasive ; grinding low tensile strength of the material should be used more brittle or high- strength silicon carbide abrasive. Various abrasive properties, uses and options, the choice here is not as elaborate abrasive particle size , should mainly be based on precision, surface roughness and grinding efficiency requirements to choose. General principles are as follows : grind the workpiece roughness requirements are high , you should choose a coarse-grained ; requires low surface roughness , fine-grained should be selected . When the work requires a higher geometric precision and low surface roughness , grain size should be selected mix . High precision workpiece geometry , when the abrasive wheel and the workpiece contact area hours should choose fine-grained ; large contact area , choose a coarse-grained . Workpiece material is hard and brittle , you should choose a fine-grained ; workpiece material soft and tough , you should choose a coarse-grained . Poor thermal conductivity of the workpiece , easy to heat deformation, easy to burn, should be selected coarse granularity. These problems are related to the factors that affect the performance of abrasive grinding thermal conductivity , heat capacity , density, porosity and other abrasive usually divided - coarse abrasive, abrasive , abrasive powder fine abrasive and so are several . Under the same conditions with an abrasive , abrasive powder larger total surface area , total surface area of ​​less coarse abrasive . Abrasive surface required in the production of tuberculosis agents parcels, giving bond strength, the greater the total surface area of ​​the abrasive child , you need to wrap the abrasive surface of the inorganic polymer binders will get. Generally with coarse abrasive than the fine abrasive inorganic polymer used in small doses combined . Abrasive particle size distribution, in order to make the grinding efficiency, not only to consider the strength and machining abrasive materials , but also must determine what kinds of abrasives with the amount of grading that is abrasive . When conducting abrasive grinding , abrasive grinding body on the one hand the role of impact , it also undermined the role of the grinding bodies , so as to ensure the sharpness abrasive to complete the entire grinding process. Obviously , in the unit of time , the contact point of the grinding body more involved grinding , i.e., the more abrasive grinding unit of time involved , the higher grinding efficiency . When the abrasive must , to increase the grinding body in contact with the abrasive , the better the smaller the size of the abrasive . On the other hand , to complete the grinding of the workpiece grinding , the grinding capacity must be sufficient impact job . Abrasive task is necessary to ensure sufficient capacity for grinding the workpiece material , and also ensure that the grinding wheel on the workpiece to a certain fineness , therefore , in the case of certain other conditions (e.g., abrasive strength, grinding speed , etc.) , this task only by selecting the appropriate size abrasive and they are reasonable proportion to complete. In theory, the abrasive grinding gap between production is followed by a binding agent to produce coated abrasives, less polymer to achieve the amount of the inorganic binding agent to meet abrasive strength and reaches improve the grinding efficiency purposes , it should be to minimize the gap between the abrasive particles . Another idea that should be adopted to clarify that burns occur when people are accustomed to the work attributed to the set of values ​​abrasive grinding wheel is too dense, the lack of sufficient capacity crumbs pores. Holes in the ground of debris from the chip and chip effect, and can accommodate coolant helps grinding heat dissipation . To meet the special processing requirements, traditional abrasive impregnated pores can also certain fillers such as sulfur and paraffin wax , in order to improve the performance of the abrasive . Such fillers, also known as the fourth element of the traditional abrasive . This is not always correct, because the sheer number of wear debris generated when high- cut grinding , large pore volume are by no means can accommodate small , abrasive and superabrasive wheels although no pores. As long as its surface dressing appropriately can work well . If you increase the pore volume ratio of resin abrasive wheel is bound to reduce its strength, making it premature wear , it is not worth the candle thing. In addition , the linear velocity of the wheel work to produce the quantity of debris is more complex when the grinding wheel increased from 28.8m / s to 33.6m / s , the speed is increased by 16 %, while the blockage increased threefold. Because the wheel speed increases the maximum depth of cut so that the abrasive grains decreases , the cross-sectional area of ​​the chip is reduced , while the number of cutting and grinding heat increases , so that these two factors are increased clogging , but when a high degree of wheel speed ( eg up to 50m / s or more ) the amount of wheel jam but greatly reduced . For a variety of workpiece materials, each with a certain minimum amount of its critical blockage wheel speed values. Inorganic polymer binder produced little abrasive on these considerations , the grinding of these theories will be introduced again in the future special . ) As to ways to reduce high-speed mill burns problem, the following specific abrasive elements will be talked about . Quantitative abrasive particle size distribution and thickness of the extent that the degree of particle size distribution and thickness abrasive . District represented by graded abrasive grading , which means that the thickness of the abrasive used fineness modulus .

Wetting and adhesive coated abrasives with phenolic resin

A wetting mechanism wetting (wetting) refers to the solid surface with a liquid replaced by another immiscible fluid process that is solid interface by the solid - gas interface into a solid - liquid interface phenomenon. Bonding of the two materials ( or materials ) between its first condition is to be able to wet each other. Further, the wetting properties of adhesives and adhesion between the body is the main factor affecting the  quick change disc adhesion strength , good wetting properties can increase the work of adhesion between the two phases , which will help improve the adhesion strength. Phenolic resins are coated abrasive one of several synthetic resin industry to use in fabric treatment, primer , glue complex plays a very important role , with the wetting properties between the substrate and the abrasive directly affects the final product performance wetting phenomena into wet (ashesion), wet (immersions) and spreading (spreading) of three types . Method or process different wettability , ease of wetting and wetting conditions are different . Corresponding to three types of different contact angle spread is an  abrasive paper sheet ideal state . Related to this there are several important concepts, including contact angle , surface tension, surface free energy . The contact angle is judged whether the liquid wetting the most convenient method for a solid surface , the liquid droplets (L) on an ideal plane (S), if one phase is a gas , the contact angle is a gas - liquid interface through the liquid and solid - liquid interface of the clip angle . The minimum contact angle is 0 °, a maximum of 180 °. The smaller the contact angle , the better the wettability .
Surface tension: the role of the liquid surface layer along the surface gravity is not balanced because the molecules produced in either a tension on the line . Molecular force suffered not equal to zero, which together point to a direction perpendicular to the liquid inside , resulting in a liquid surface with automatic narrowing trend , this contraction force called surface tension. Surface tension (surface tension) is a characteristic of the material , the nature of its size and temperature, and the two-phase interface -related substances . Study of the liquid resin interface issues , generally indicated by surface tension . Surface free energy : Under conditions of constant temperature and pressure so that the system unit surface area increases , the outside world must work done on the system . Interface Problem solids , using free energy to be more appropriate. Solid surface can be divided into two types of high-energy surfaces and low energy surfaces . Surface energy refers to the surface of the metal and its oxide , silica, inorganic salts , and the surface free energy is generally between 500 ~ 5000mJ/m2. Hardness and melting point of  cut off wheel such materials is higher, the greater the surface free energy . Refers to a low energy surface organic solid surface, such as paraffin wax and a polymer compound . Their surface free energy of less than 100 mJ/m2. High surface energy to more readily absorb the liquid suction surface tension higher than the low surface energy , because of the lower surface free polyester fabric surfaces are low energy surfaces , and no polar groups, so that its surface is not easy to spread the adhesive and wetting there are two interfaces , one is a solid substrate , one is a liquid resin , mainly a phenolic resin. Bonding two ways to solve the problem to solve. Common approach to solve the problem of solid interface is treated substrate surface , increasing the surface free energy ; improve fabric processing formulations and processes. For a phenolic resin, a method to reduce the surface tension of the resin are mainly modified , an appropriate increase in temperature of the resin , adding a suitable surfactant.

Mainly used for grinding high-speed steel tools alumina

 Mainly used for grinding high-speed steel tools alumina sand and white colors, mainly with silicon carbide grinding carbide blade wheel that green. Abrasive grain size, hardness, binders and organizational five factors determine the characteristics of the wheel. The following will do a brief introduction of these properties. 1) abrasive, abrasives are cutting and grinding disc  commonly used oxide, carbide, and high-hardness abrasive system three kinds. Ships and factories commonly used is aluminum oxide and silicon carbide grinding wheel grinding wheel. Alumina abrasive grinding wheel low hardness (HV2000-HV2400), toughness, apply sharpening high speed steel tool, which is called corundum white, taupe called corundum.
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  mini flap disc commonly is black and green silicon carbide wheel. The green silicon 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 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 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 metal cutting wheel  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.

Elaborate molding resin abrasive loose materials research

Ordinary resin abrasive multi- phenolic resin powder as binding agents , phenolic resin solution as a wetting agent , molding material is easy sticky lumps, loose poor , especially in hot , rainy summer , often difficult scraper . In recent years, the introduction of automatic presses , feeding and scraping are mechanized automatic operation of the  ceramic flap disc resin molding material loose abrasive than manual operation requires a higher end, we use domestic raw materials for resin loose material a preliminary exploration. A resin molding material does not lead to loose causes and ways to solve
1.1 We believe that the cause of the molding material does not cause the loose agglomerate is mainly due to easy phenol resin solution containing free phenol ( at a level of about 20% ) , a portion of the free phenol can dissolve the phenol resin powder adhered to the resulting mill dry resin powder particle surface tacky . In addition , phenolic resin powder is easy to absorb moisture, the moisture absorption too sticky , the higher the temperature, the greater the liquid phenolic resin, phenolic resin powder solubility . So, in the summer and the rainy season , the resin molding  abrasive disc material is easy to agglomerate. 1.2 Uses for solving the above-mentioned reasons, we loose material from the three approaches to be explored : ① using refractory phenolic resin powder as binder ; ② using free phenol -free wetting agent ; ③ new mixing process 2 test brief introduction
2.1 refractory phenolic resin powder
Softening point and the degree of polymerization and the degree of moisture absorption on the phenol resin powder , melting point , the greater the degree of polymerization , the lower the degree of moisture absorption , a phenol resin powder as the degree of polymerization greater the phenol resin solution , the harder it is dissolved , so use phenolic resin powder as a refractory binder effective to reduce the degree of sticking and agglomeration of the molding material . Test proved : refractory phenolic resin powder / liquid mixing phenolic resin molding material out , placed within two hours without caking ; placed two hours - slightly caking within two days in the plastic bag , in a twist sieve , namely loose open to non-phenolic wetting agent 2.2
Although many of the liquid phenol , but it can meet the requirements of little loose material , after testing, we  Sanding Sheets found that triethanolamine is an ideal wetting agent , triethanolamine moderate toxic, non-irritating odor , viscosity, price cheaper , with phenolic resin powder / triethanolamine mix the resin molding material is very loose , non-caking, and loose without affecting the melting point of the phenolic resin powder , body strength and wheel to ensure performance , as shown in Table 5, Table 8 , can be balanced furnace inspection .
After testing, phenolic resin powder / triethanolamine mixed with a resin molding material, is placed within the three days , no agglomeration , prior to feeding the screen no longer loose feel good scraper , which is a phenol resin having a melting point of 84 ℃ powder , mixed material out of the molding can also be placed three days , the same loose .

abrasive Information mortal include

With sticky abrasive material is abrasive and acceptance made of special process approach dedicated polishing wheel grinder fast in reverse, the parts close to the friction with the polishing wheel, abrasive on  the sharp edges round the parts smooth and shiny appearance grinding process  non woven flap wheel process approach.
Polishing INFORMATION Primary effect is the appearance of the workpiece can burrs, scratches, traces of erosion, weld, welding slag, blisters, bubbles, oxide film, char, rather than substance, and not the ablation alkaline solution to remove other impurities , also make all kinds of micro-defects can be improved.
First, the data is also known as polishing abrasive materials, ordinary is polishing paste, abrasive, polishing sand, polishing, abrasives, polishing things in general. Grinding documentation belong  ceramic belt to the "hardware stuff" category. Abrasive materials, abrasive Information mortal include: sandpaper, grinding wheel, emery cloth, wire wheels, grindstones, Whetstone, grinding, grinding, abrasive belt, cutting discs, grinding blocks, plates, wheel, cloth wheel, sponge wheel, flax wheel and other abrasive. Abrasive grinding data include: polishing paste, polishing oil, polishing liquid, carborundum, polishing paste, polishing wax, polishing soap, polishing sand, black corundum abrasives, abrasive corundum, white corundum abrasives, chromium corundum abrasives, abrasive corundum natural and artificial abrasives abrasives and other abrasives.
Second, the abrasive polishing paste data  portable belt varieties yellow polishing paste. Feldspar powder and paint from the fat, fatty acids, pine nasal spray, Huang Dan, lime, soil and other common Pink made for iron, copper, aluminum and bakelite, etc. polishing; white polishing paste. The lime and fatty acids, stearic acid, paint fat, suet, tallow, ground wax together made for copper, nickel, aluminum and bakelite etc. polishing.