Gordon England Surface Engineering Forum



galling problem; 52100 chrome steel sliding on A2 tool steel, 57 HRC


Posted by Penny (216.166.211.162) on June 04, 2004 at 22:17:41:

My company is experiencing a problem with galling between a cam and cam follower. Can you make any suggestions for improvement?

The cam is A2 tool steel with a hardness of 60-61 Rockwell C and a surface roughness of 12 (Ra). (We wanted a 4 roughness but it wasn't achievable by our vendor).

The follower is 52100 chrome steel, 57-58 Rc, measured surface roughness of 4 Ra.

Lubricant is a lithium based grease with MolyDiSulfide and "polymers". There's no recirculation of the lubricant so I believe its effect is negligible after the first cycle. We have a reciprocating sliding motion.

Due to the loads in our application, we are forcing the material to deform til the contact area is sufficient to carry the load. The follower surface is spherical and we wear a small flat path in it.

Coatings we have tried wore off immediately. We cannot reduce the load, nor distribute it among more contact points. We get almost immediate galling on the larger units (and a terrible noise), then over time it wears in and carries the load.

We are considering methods to reduce the surface roughness, alternate lubricants, and a coating for the A2 element to try to break up the adhesive wear mechanism. Do any of these seem like a waste of time? Which avenue would you deem to be most promising? Any other ideas?

Your comments would be greatly appreciated.


Follow Ups:


Surface Engineering Forum

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Search Message Boards Archives

www.gordonengland.co.uk





GoogleCustom Search

Post A Message!

Gordon England Surface Engineering ForumPlease go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to the page if you wish to reactivate a thread on the new forum.







Gordon England Independent Thermal Spray Coating Consultant
Telephone: +44 (0)1252 405186

PLEASE CLICK HERE TO EMAIL

Site Links

Introducing

Nature of Thermal Spray Coatings

Surface Engineering in a Nutshell

Surface Engineering Forum

Thermal Spray Gun Repair Service

Plasma Consumable Parts

Thermal Spray Powder Supplies

Applications:

Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers

HVOF Coating of Paper Making Roll

Abradable Coatings

Photomicrographs

Thermal Spray Processes:

Combustion Wire Thermal Spray Process

Combustion Powder Thermal Spray Process

Arc Wire Thermal Spray Process

Plasma Thermal Spray Process

HVOF Thermal Spray Process

Detonation Thermal Spray Process

Plasma Flame Theory

Cold Spray Coating Process



Wear and Use of Thermal Spray Coatings

Corrosion and Use of Thermal Spray Coatings

Glossary of Thermal Spray and Surface Engineering Terms

Image Directory for Thermal Spray Coatings

Plasma Gas Flow Information

Plasma Gas Flow Correction Calculator

Contact Form

Links to other interesting sites related to thermal spray and surface engineering

Reciprocal Links

Periodic Table of the Elements

SI Units

Calculators for Conversion between Units of Measurement

Hardness Testing

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Search This Site


Photography Gallery2

Photography Gallery3


© Copyright Gordon England