LIQUID BILLET LUBRICATION SYSTEM
ALU-JECT is a soluble lubricant made up of a blend of acids and salts to form a soap. The lubricant dries onto the billet forming a lubricant barrier protecting the dummy block from the aluminum billet and allowing the dummy block to easily retract without any adhesion to the billet.
ALU-JECT is a non-pigmented, water based lubricant designed for billet and coating. It is formulated using organometallic compounds which apply a boundary film to prevent welding of the billet to the dummy block; providing excellent release characteristics. ALU-JECT is capable of wetting temperature as high as 1112º F (600º C).
LIQUID BILLET LUBRICATION SYSTEM
Greases and oil-based graphite suspensions can only be applied by hand. They are cheap, but require a worker to be present at all times. These materials are inflammable at high temperature. This can cause problems with electrical equipment. Also explosions create blisters in the billet, which can lead to small holes in the extruded profile. This cannot be tolerated by most markets today. Handling is also messy, and the material is environmentally problematic.
Acetylene is ignited in front of the billet, generating carbon black. Acetylene was the first technology to operate automatically, since the flame is lit as the billet passes the burner on its way out of the preheating furnace. Carbon is a good release agent, but due to its small size, carbon black is a carcinogenic. Workers must be protected against breathing in any powder that does not stick to the billet. This also causes problems with the quality of the extruded profile. It can create black marks on the profile that cannot be removed and interfere with anodizing.
The application of electrostatic Boron Nitride (BN) is a good alternative. Its release and lubrication characteristics outperform carbon black. It is also simple to automate the coating of the billet when using BN. BN is not carcinogenic, is nontoxic and chemically inert. There will be no white marks, even inside the die, therefore there are no marks on the profile surfaces.
Castool Tooling Systems has developed a unique process of application of a liquid soluble lubricant to a preheated extrusion billet prior to loading into the press. The obstacle to their use was the Leidenfrost affect, which makes it difficult to coat a surface greater than 600ºC with a water based product. New binders have been developed which makes it possible to now apply water based lubricant to the billet.
The process enables improved coverage compared to boron nitride powder application with much less overspray and lower consumable costs.
- To help instantly and cleanly separate the dummy block from the billet at the end of each extrusion cycle, without pulling extruded section from the die
- Aluminium alloys stick to steel at or above 400ºC, and becomes more of a problem the larger the billet diameter, because of the increased surface area
- A carefully measured amount of lubricant is applied on the billet face
- Excess lubricant is an unnecessary cost, and a workplace pollutant
- Every effort must be made to eliminate the possibility of any non-metallic substance getting into the extruded product • Lubricant can be purchased as a liquid, tablet or solid soap bar
- Improved safety, as there is no fire risk
- No graphite or oil contamination
- No health risks
- Product quality of extruded profile is enhanced
- Costly downtime reduced
- Tooling life increased
With the lubrication system, Castool again sets a new standard of excellence in the extrusion industry.
Results may vary depending on individual press characteristics and setup.
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