Precision Slitting

Select complete tooling sets for repeated widths... let us design a shimless tooling system for a virtually burr-free-state-of-the-art slitting capability...or choose from a wide variety of individual slitting tools.

Our Sales Engineers are ready to assist you in realizing longer knife life, cleaner cuts, and higher quality output.

Slitter Knife Material Selection

Selecting the optimum material for your slitter knives should be given careful consideration. Knife purchasers should always ask the following questions:

• What sorts of materials are we slitting?
• What sort of knife life do we currently enjoy?
• Are our knives subject to chipping or premature wear?
• Do we actually know what type of material our knives are made of? What hardness?
• Are we satisfied with the quality of our slit edge?

When evaluating slitter knife materials, one should focus on the balance between knife life (maximum wear resistance) and toughness (ability to withstand shock). The same knife that gives you superior wearability on light gauge materials may not stand up to thicker gauges or higher tensile strength materials.

Rockwell hardness levels of your knife materials are also of great importance. When toughness is the prerequisite, lower hardness levels are indicated. Correct hardness levels (in the 56-58 RHC range), coupled with the proper knife material can give your slitter knives greater toughness and chip resistance.

Over the years, DIENES has developed a variety of alloy mixes in order to precisely match knife materials with the increasing variety of modern-day slit materials.

For example, DIENES' MN-16 and MN-17 materials combine carbon, chromium and vanadium (for hardenability and wear resistance) with silicon for molybdenum (for enhancing toughness and resistance to shock). Vanadium, usually associated with strong carbide forming, also adds resis-

tance to shock impact. MN-16 was designed for maximum toughness and maximum shock resistance while MN-17 was designed for maximum toughness and good wear resistance. DEINES has enjoyed great success with these alloy mixes, hardened to a RHC 58 level, for slitting materials up to 3/8" thickness.

When superior wear resistance is required, DIENES' MN -18 material is the specification choice. MN-18 knives high levels of carbon chromium, and tungsten for greater wear resistance with vanadium and molybdenum for adequate toughness, as well as high levels of cobalt to intensify the individual effects of other elements. The recommended Rockwell range for this material is RHC 60-63.

The ultimate material selection for wear resistance lies within the particle metals group. The extremely tight grain structure inherent with particle metals imparts greatly enhanced knife edge life. While in the past the superior wear resistance was achieved by sacrificing shock resistance, modern particle metallurgical techniques have somewhat lessened this fact.

DIENES' MN-7 particle metal material, with medium chrome and high vanadium levels, is the material of choice when wear resistance is the chief consideration.

Knife buyers should always keep in mind that great wear resistance is gained through a loss in the ability of a knife to withstand shock and vice versa. DIENES "MN alloy series" materials have strived to maintain a successful balance between these important considerations.

Of course, we can supply you with any knife materials you desire, in addition to our own specialty alloy steels. Please let our experienced Sales Engineers know of your current needs or problems. We are always happy to talk "shop".

Technical Information

The criteria for selecting the right material are maximum wear resistance and toughness. These requirements are determined by the material which has to be cut. The materials shown in the diagram consider the average hardness according to their specific properties.