The production process of galvanizing line is as follows: cold hard coil → deoiling → continuous quenching → hot galvanizing → finishing → straightening → roller coating → electromagnetic induction heating → air cooling → quality inspection → oil wiping
scale re packaging. In its production and manufacturing, it is very easy to crack the stamping die, which endangers the production and manufacturing of customers. The causes are as follows:
1. Annealing temperature
Annealing temperature is a key processing parameter in the hot-dip galvanizing process, which is harmful to the tensile strength of products. When the annealing temperature is low, the quenching is not enough, the crystal
is plagued with cat's plague, the compressive strength is high and the elongation is low; when the annealing temperature is too high, it is very easy to cause the crystal to appear abnormally thick and strong, and the compressive strength reduced by the
tensile strength is more significant, and the product is very easy to break immediately in the whole process of customer stamping die forming and drawing.
2. Production and processing moistening
The roughness of raw material will damage the
oil storage ability of its surface layer. The suitable roughness of coil steel is also very important for the stamping die characteristics of raw material. In addition, the selection of oil amount is very important. If the oil amount is too small, the
raw materials will not be fully moistened in the whole process of stamping die, which will cause the cracking of stamping die of raw materials; if the oil amount is too much, the whole process of slitting and forming will easily deviate, which will harm
the sense of production rhythm.
3. Transition fit between raw material thickness and grinding tool
In the whole process of stamping process, the matching of the gap between the grinding tool and the thickness of the raw material is a key factor
to cause the crack of the raw material.
4. Manipulation of miscellaneous and other shortcomings
It's very bad to press the impurity and dirt into the stamping die for the products of the stamping die. Because the elongation of the part of
the impurity position is not enough, it's very easy to cause the stamping die and the drawing crack.