Method
VARIOPRINT optimises the coating of drill holes
In order to be able to coat even complex inner geometries, VARIOPRINT has developed new system solutions on the basis of the pad printing method. With these, drill holes can be precisely coated with solid film lubricants, release agents, oil, adhesives, paints, etc. Advantages:
- No spraying, no contamination outside of the coating area
- Even layer thickness across the entire depth of the drill hole
- Precise transferring
- Lubrication assistance with thermal stress
For this, solid film lubricants are applied, e.g. with piston pin drill holes – with very high precision of layer thickness - Bushing assembly, optimisation of pressing characteristic
Application of lubricant (wax) in the printing area of drill holes. Through the high application precision, the subsequent welding of assembly parts is not impaired. - The seating points of plastic housings of electrical devices can be printed with solid film lubricants (saving of bearing bushings).
Technology:
An expandable pad roll is mounted on a rotatable pin, which is mounted on the pad axle of an electrically driven VARIOPRINT pad printing machine. The circumference and width of the drill hole to be printed has been evenly applied to the printing block. With the printing process, the printing pin is applied parallel on the printing block, after this, the printing block proceeds such that the printing pin rotates on the printing block and the printing surface is transferred to the pad roll. Now, the printing pin moves into the drill hole to be printed. The pad roll is expanded. The printing medium is transferred into the drill hole.