Most of the initial production of ceramic grinding wheel, ceramic bonded grinding wheel has the advantage of its natural porous and chemical stabilityQualitative,Which is suitable for dry grinding and wet grinding,Especially when water-based and oil-based grinding fluids are used.but,Ceramic wheel of the poor flexibility,And requires a high sintering temperature,Limiting its development.
Phenolic resinMixture wheel has a good elasticity,On the shock,Impact,Lateral pressure sensitivity of the small advantages.Its high stability makes it Able to adapt to higher speed and improve the grinding performance,Which is particularly suitable for grinding wheel and cutting wheel,it Of the good flexibility to make it suitable for ultra-precision grinding and surface polishing.
Phenolic resin-bonded grinding wheel production process are mainly cold-pressing process, semi-hot pressing process and hot pressing process three

Species.
1.Cold pressing process:
Cold bonding process using binder and wetting agent powder, usually used as a wetting agent with liquid phenolic
Resin, furfural, furfuryl alcohol, cresol, etc., with the most liquid phenolic resin. Determine the liquid resin and
The ratio of powdered resin used (usually called Liquid powder ratio) Of the factors are: abrasive particle size distribution, filler type,The filler content, the viscosity of the liquid resin, the nature of the powdered resin, and the like. If the viscosity of the liquid resin is larger,Completely coated abrasive surface on the need for more liquid resin; abrasive and filler particle size, the smaller the table The larger the area, the greater the amount of liquid; the higher the molecular weight of the powder resin, the lower the free phenol,Its adhesion with the liquid resin is worse, the more the amount of liquid required. Above several situations need to mention High liquid powder ratio. Liquid resin is generally used as a wetting agent,Liquid powder than the selection1:2-1:4, And with furfural or Furfuryl alcohol and anthracene oil as a wetting agent mixture, liquid powder than the selection1:6-1:8. Mixing machine to go through the process To achieve the desired mixing effect without damaging the abrasive. When adding the mixture of fine powder
Between the general2-5Minute, too short can not guarantee mixing evenly, too long resin film easy to fall off, and lead Caused by material temperature rise, the resin to cure.
The mixing procedure is as follows:
First, the abrasive, usually mixed particle size, pre-mixed, then add wetting agent, uniform wetting abrasive,

The powdery resin which had been mixed with other powdery fillers was further added and the mixture was further mixed until homogeneous. Mixed good grinding

Material should have good plasticity and mobility, the material can not be too wet, or easy to agglomerate, but can not have powder

Group, while ensuring a good liquidity, in order to ensure adequate injection, the general method used to remove the sieve

Piece. Good or bad way to determine the plasticity of materials is: grasping a good mix of materials, gently pinch it by hand

Into a group better.



The general will be good to join the powdery material in the wet abrasive in the formation of easy dough, has gradually been eliminated, now

In the use of more double-pot mixture method is the first abrasive and wetting agent in a mixer in the mix,

While another mixer will be powdered resin and other powder filler mix, and then a good wetting abrasive

Into the powder, the mixture can be uniform. Double-pot mixture of the advantages of both can not produce dough, but also to avoid

Pollution-free, easy to clean material pot.



The mixed material is sieved, that can be used to suppress the.



The pressing procedure is as follows:



The mold is installed, weighing the required amount of abrasive into the mold cavity, flattened after the suppression. Need to be placed

Reinforced fiberglass mesh is placed as required. And then pressurized at room temperature, the general pressure of the cold pressure range15-30N / mm2, Preferably15-25 N / mm2. The choice of pressure depends on the material plasticity

And the density required to achieve the wheel. Should not use too high pressure, otherwise it will crush the abrasive. When pressed

Between the general5-50Sec, preferably5-30Sec, the length of time depends on the wheel to achieve the required density andShape and material plasticity is good or bad. Then you can remove the wheel for the next step- Cured.