In all kinds of Tubesheet form, Tube sheet hole is a difficult one, because the hole is Tubesheet Tubesheet on the inner surface of the parts, observation and control of Tubesheet process is relatively difficult, so the hole Tubesheet than the outer circle surface of the open type Tubesheet is difficult, and in all kinds of holes in Tubesheet complex, shaped, deep hole the Tubesheet is particularly difficult. For example: the bottle cavity hole shaped hole Tubesheet, Tubesheet, Tubesheet are a deep blind hole, put forward higher requirements on the tool.

Tubesheet of these holes have the following requirements:

1 deep hole Tubesheet to solve the vibration problem;

2 bottles of deep hole cavity to solve the problem of radial feed;

3 for the bottle cavity hole precision and the smoothness of the high tool to have accurate feed at the same time, but also has the ability of finishing Tubesheet;

4 deep blind hole Tubesheet to solve the problem of chip back, at the same time to solve the problem of cooling and sealing problems.