The grinder operator must learn the following skills.
- Learn to operate overhead crane and the use of the proper cables according to the load requirements
- The proper set up of the machine for the roll that is going to be ground, blocks and stands.
- Check the serial number of the roll and match it with the factory order prior to loading the roll in the grinder
- Install proper drive to turn the roll body in the grinder
- Have bearings installed or operator install the bearings on the roll that will be ground if necessary. Proper installation of bearings.
- Stage rolls behind the grinder ( stage next roll to be ground)
- Cleaning and maintaining the grinder
- Report to supervision any issues or problems during the shift with the roll or the grinder
- Work the schedule shift assigned
- Work overtime as requested
- Inventory of grinding belts required
- Learn precision measuring equipment
The actual job duties are listed below after proper training:
- Locate the roll that is next in the schedule and match the serial number of the roll to the factory order.
- Install bearings if required for grinding if not already on the roll.
- Set up the grinder with the proper strands or blocks for the roll to rest on during the grind
- Check the cables for the correct weight of the roll install the cables on the crane and lift the roll and place in the grinder.
- Install proper drive to turn the roll during the grind process
- Check the diameter of the roll on the drive end, center and tailstock end of the roll.
- Install the proper information in the CNC controls of the grinder to perform the grind.
- Adjust the information to be set for the desired crown and tapers.
- Install 36 grit belt and proceed to grind the roll to .125 above customer desired finish.
- Inspect the cover throughout the grinding process for any contamination or issues
- Stop the roll check the hardness to confirm the desired hardness that is stated on the factory order is within tolerance.
- Check the alignment of the roll and make sure the crown profile is correct. Make any adjustments to the end to end alignment or crown as needed.
- Change to the next finer grinding belt and grind the roll to remove the 36 grit scratches
- After he removal of the 36 grit scratches stop the roll, check the crown profile and end to end alignment.
- Proceed to the next finer grit belt and continue to grind the roll to the specified finish stated on the factory order.
- After the grinding of the roll is completed, check crown and alignment with digital calipers and print the profile for attachment to the factory order.
- Take all hardness readings required on all four sides of the roll cover.
- Install the tapers or end relief as stated on the factory order.
- Have supervision or lead person check the roll against the factory and sign off as approved.
- Wrap roll with shrink wrap and remove from the grinder
- Place the roll as close as you can to the next department that will work with this unit.
- Clean the machine and blocks and proceed to the next roll scheduled.
For a regrind of a roll the same steps would be followed with the addition of the incoming crown profile and hardness readings would be obtained and recorded prior to the grinding of the roll.
Posting ID: 531384580Posted: 2019-10-07