For tube expanding it is desirable to roll the tube quickly as it prevents work hardening of the tube and less frictional heat is generated. The limiting factors in this balance of speed vs. power are voltage or pneumatic pressure. These either limit the speed or power being produced.
Tube rolling occurs when the tube rotates due to inadequate friction between the tube OD and the hole in the tube sheet. This can cause increased expansion times and decrease the efficiency of the operator. Increasing the friction between the tube and tube sheet and or collar the tube will not rotate within the tube sheet. Increasing the friction can be done using several different methods:
Learn how to quickly change out roll sets to avoid drops in productivity.
In order to obtain the best results and improve tool life, proper lubrication is necessary. There are many different types of lubricants designed to suit specific applications and operator preferences.
3 roll expanders often cover the widest range of tube sizes and work well in many different applications. However, there are circumstances where the 5-roll expander is the best option for the job.
Provided in the Elliott Tube Gauge kit is a setting ring, screw driver, and wrench. Indicated on the setting ring is the proper calibration diameter for the gauge.
Loss of productivity, downtime, and decreased roll quality are all possible results of avoiding routine care of pneumatic motors. These issues require the motor to be removed from operation and examined and possibly sent back to the manufacturer for repairs – possibly delaying jobs.
Some of the most overlooked best practices of tube expansion involves the use of pre-expansion tools. In order to create a better mechanical joint and prolong tool life, it is important that the appropriate pre-expansion tools are used.
CTI’s operators were pleased to find that the Midi-Torq and Maxi-Torq were perfect for their job application. The motors supported the tube OD range, torque range, and production rate required for their work. Additionally, the motors were very durable and reliable, essential for CTI since a large part of their work is performed in the field, all over the world.
Between less tool replacements and faster cycle times, the manufacturer was able to save significant production time by using the 24 Series Expanders.
