Eisele connectors are used on spray dosing systems from HPM Technologie


n applications as diverse as metal machining and food production, it is

necessary to apply cooling lubricants, grease, oil, alcoholic solutions and many other fluids to surfaces and components. In contrast to conventional nozzle systems, the spray heads from HPM Technologie ensure precise distribution of the exact amount of the required fluid, for a clean environment and low consumption. The supply of compressed air and liquids to the spray heads is achieved with high-quality all metal push-in fittings from Eisele.

COST BENEFITS FOR PRODUCTION The essential advantage of minimal lubrication is the enormous reduction of the lubricant quantities used compared with conventional cooling lubricant systems and concepts. As opposed to conventional flood lubrication or large- area application, processes that use minimal lubrication require only a few millilitres per hour. The minimal application of fluid also reduces the environmental impact, operating costs and system contamination. According to the Bureau of Statistics, cooling lubricant costs make up 8 to 16 % of the total costs in metal machining processes and therefore represent a relevant cost pool that can be significantly reduced by using a modern minimal lubrication system. To minimise maintenance and maximise

user-friendliness, the spray heads at HPM Technologie are supplied with media using connection components from Eisele Pneumatics. The German company has 80 years of experience in high-quality all metal push-in fittings for use with compressed air. But Eisele push-in fittings can also be used for other media, including gases, coolants, vacuum and liquids – even in combination with electrical and electronic signals. HPM Technologie had already been purchasing components from Eisele on a regular basis for 40 years when the two companies began cooperating in 2006 to develop and improve custom solutions for specific systems and processes. Since 2013 Eisele has been HPM’s primary supplier of connection components. This turns out to have been a good choice: “Eisele simply has excellent products, both visually and functionally,” said Steffen Hoffmann, member of management, in describing the cooperation with Eisele. For supplying the spray heads with lubricant for minimal lubrication, the


accordingly. For unchanging parameters (fluid, spray and fluid pressure) the quantity is always 100% reproducible. The outgoing supply line is positioned at a 90° angle to the spray head. All spray heads are available separately or as a spray head group. The spray head group for the low- pressure range from 0.5 – 2.5 bar includes air and fluid connections with a check valve for the distributor, with air consumption of 2 – 5.5 l/min. The most recent spray system, PPJ,

company uses straight push-in fittings of nickel-plated brass with a release sleeve from Series 14 and 14A of the Eisele BASICLINE. Although the push-in fittings on the spray heads are labelled, Eisele also equips them with a blue-coded aluminium sleeve, which unmistakably shows where to connect the blue tube, eliminating any possibility of an incorrect connection. The push-in fittings with a release sleeve

feature a larger gripping surface for release of the tube as compared with a simple release ring. This is especially advantageous in applications that use oils or cooling lubricants in which components near the drill or milling head – despite the high level of precision – can be covered with a spray medium, for example due to a malfunction of the machine or oversight on the part of the operator. For the smaller spray heads of the LEO series, HPM Technologie uses products from Series 10 of the Eisele BASICLINE. In these straight push-in fittings of black passivated brass the tube is held by a union nut.

LEO SERIES – ADVANCED SPRAY TECHNOLOGY In developing the new LEO series the focus was on a reproducible quantity setting. In the past, the desired spray quantity had to be set by turning the nozzle and then fastening it with a lock nut. With the universal LEO spray head, the spray quantity is set by means of a graduated drum, without the use of tools. This not only makes it possible to check the setting for the quantity at any time, but also to adjust the setting. Any changes are immediately visible and can be corrected

The precise spray cone ensures economical dosing of the cooling lubricant at exactly the location where it is needed

For more than 70 years the German company HPM Technologie GmbH has been constructing state-of-the-art spray heads for minimal lubrication in high- precision dosing applications for all types of fluids

Photo: HPM Technologie GmbH

Push-in fittings of the Eisele BASICLINE, shown in the left area of the image to the right, are ideal for compressed air, vacuum, gases and certain fluids. The blue coded sleeve prevents incorrect connection of the tubes

features not only advanced components and optimal sizes, but also an innovative design. Independent regulation of the fluid and spray air pressure in the PPJ valve and tank assembly make it possible to achieve outstanding results even with high- viscosity media. It can supply up to six spray heads and is available with three tank sizes for a space-saving installation. The system is suitable both for installation as original equipment as well as for retrofitting. The PPJ system can be set to a maximum viscosity of 2,300 mm²/s at 20°C or 500 mm²/s at 40°C.

With the new, universal LEO spray head, the spray quantity is set by means of a graduated drum, without the use of tools

Photo: HPM Technologie GmbH

ADVANTAGES OVER CONVENTIONAL LUBRICATION The advantages of minimal lubrication in processes such as thread cutting or milling are obvious: cooling lubricant consumption is much lower and, when dosed correctly, workpieces and machines require only minimal cleaning. It also eliminates the need for recovery of the cooling lubricant emulsion and chips, and disposal of residue. Other benefits include higher cutting speeds and a better surface quality. HPM Technologie develops custom

solutions for applications that require other spray heads than the series models. Numerous custom solutions have already been developed for the food industry. Due to the stringent hygiene standards of such applications, stainless steel push-in fittings of the Eisele INOXLINE are used, for example in dosing systems for fine distribution of grease on baking sheets. In connection with all metal push-in fittings from Eisele, spray heads manufactured by HPM Technologie are also used in the printing industry, as well as in aerospace engineering.


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