People go out to see all the products in the screw fasteners, most of the screw fasteners are head shape, the thread symmetry without burr, the surface is bright, but all the screw fasteners are like that?Perhaps not, screw fasteners in the production and manufacture, technical failure or equipment is not adjusted, are leading to many surface defects, mesh tells you the most common screw fasteners surface defects are as follows:

One, screw fastener axial force, this kind of error is generally in the second punch installation of the problem or screw manufacturing machinery equipment adjustment deviation.

Two, tilting head, tilting head often occurs, that problem is the most professional screw technical personnel headache.The key is the equipment adjustment error and a shock installation error caused by the screw fastener tilt.

Three, the top of the head is not round, the top of the head is not round the key reason is that the grinding has a problem, punching mold material quality is not very good, after the production of some screws after the mold damage, resulting in the top of the head is not round.

Four, crack, two layers, this is the great majority of the reason is in the formation of the work of no guarantee bit.The second stage means that there are problems in the whole process of tooth formation. The specific manifestations are as follows:

1, production and processing cracks, in addition to the adjustment of the problem, there are also problems with the dental plate

2, the fire baked, the interval is very big, the time can not grasp

3, crooked tail or broken tail, adjust the mechanical equipment is too tight or too loose, the actual operation is not very good, very easy to lead to the screw fastener surface defects.

4, crooked bar or tooth base is not smooth.You have to look at whether the spacing of the plates is not adjusted properly or if it is a problem to correct.