Metal cutting sheet hardening curve setting standard

The hardening process of the product in the production process of the cutting piece is a key node. Whether it is a metal cutting piece or other chemical cutting piece, if this node is not mastered, the quality of the subsequent product will be very problematic.

China cut off disc : setting of hardening curve In the resin grinding wheel manufacturing technology, there are two basic hardening curves, and all other hardening curves are the transformation of these two curves.

1. Short curve (rapid heating curve) The heating rate is faster, greater than 10 °C per hour. The total curve time is 20 to 24 hours. The curve is commonly used to harden the phenolic resin liquid as a wetting agent, and a certain amount of gypsum filler is added to the grinding wheel formula. The characteristic of the curve is: rapid hardening, and the phenolic resin powder used has a short flow length.

 2. Long curve (slow temperature rise curve) It is suitable for resin grinding wheel with good fluidity of medium (medium density, low viscosity liquid as humectant, etc.). The heating rate is slower during hardening, and the temperature rises by 3 to 5 °C per hour. It is kept at 120 ° C for about 4 hours, hardening temperature is between 160 ~ 190 ° C, the total length of the curve is 40 ~ 60 hours.

The principles to be followed for the hardening curve design:

1.large-diameter standard cut off wheel for metal, high-thickness grinding wheel, the curve temperature holding time should be long when hardening, to ensure the hardening is complete;

2.When the cutting piece is not completely hardened, the curve temperature needs to be lowered;

3. When the high-hardness cold-pressed grinding wheel is hardened, the holding time in the range of 105-120 °C must be extended to allow the volatile matter to be completely released;

4. When the resin cutting wheel is hardened, the heating rate is fast, so as to ensure sufficient fluidity of the bonding agent, thereby obtaining product performance. Short curve, low temperature hardening, can produce "soft" grinding wheel; Conversely, when producing "hard" grinding wheel, the temperature is lower than 160 °C, the grinding wheel strength is low, the grinding effect is weak, the grinding wheel is soft; when the temperature is higher than 210 °C, the hardening Excessively, the produced cutting pieces are brittle and easily broken.