Problems with long screw rolling thread （一）

As long as the people who often use long screw fasteners know, screw thread is very important, not big and not small, otherwise it will not play the role of tightening. So what happens when the thread is rolling thread?

One, there are burrs on the thread

The reason:

1. Bad adjustment of dental mold
2. Poor timing and Angle of supporting nail board
3. Materials not suitable for rolling thread
4. Too deep a cut in the thread
5. Bad Angle of dental mold

Two, the long screw thread line is not suitable

The reason:

1. Bad adjustment of dental mold
2. Poor timing and Angle of supporting nail board
3. The braces do not follow the rotation at any time
4. Poor Angle and accuracy of dental die

The size of the thread is not good

Situation reason

1. Large outer diameter, large effective diameter
2. The outer diameter is just right, and the effective diameter is large
3. The outer diameter is small, the effective diameter is large and the pressure is insufficient
4. The outer diameter is large, the effective diameter is just the rolling thread diameter and the long screw groove depth of the dental mold
5. The outer diameter is small, and the effective diameter is just small for rolling thread
6. Large outside diameter, small effective diameter, too much pressure
7. The outer diameter is just right, and the effective diameter is small
8. Small outer diameter, small effective diameter small rolling thread diameter

Four, the long screw thread peak did not rise to

There are two reasons why the thread peak did not rise to: one is the small rolling thread path, and the other is the depth of the thread mold.

The thread has an inclination

Situation reason

The effective diameter is parallel, the outer diameter has an inclination

Both the outer diameter and effective diameter are the gradient. The gradient of the diameter is not parallel to the adjustment of the thread plate

External diameter, effective diameter, different direction of the slope fixed surface, moving surface of the thread mold adjustment parallelism is poor

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