Thanks to the Muffato family’s forty years of activity building mechanical four-post eccentric presses, today we are able to produce machines with increasingly exclusive technological and construction design solutions, maintaining our focus on delivering a high quality and reliable product.
The exclusive peculiarities of our presses can be seen in the drive transmission system, from the eccentric shaft, where a guide-block system replaces the classic crank and connecting rod system. This exclusive solution provides balancing simplicity, keeping hard-to-control secondary thrust loads from happening. In addition, the guide block offers a uniform bolster plate area meaning the work load is distributed, at all times, over an orthogonal, generously-sized and constantly lubricated surface.
The reciprocating motion from the eccentric shaft to the hammer takes place through a system made up of one or two thrust cylinders (depending on size and capacity) that are integrally connected – with always orthogonal and generously-sized contact surfaces – to both the eccentric guide block and the hammer. This construction provides a unique and integral system, with linear and orthogonal surfaces constituting a single, non-deformable frame that reduces hammer deflection to a minimum during work. The shaft, cylinders, hammer and posts are what constitute a completely rigid frame construction.
The four posts guide the ram’s reciprocation and also enclose four hydraulic cylinders, which are used to raise the entire body and, therefore, adjust the bolster plate-ram distance by bringing the entire upper portion of the press to a mechanical stop with centesimal precision. During everyday use, when the press is in continuous operation mode, these cylinders enable the emergency release of the die whenever it becomes stuck, as well as its quick opening for routine maintenance or replacements, thereby reducing machine downtime and set-up errors to a minimum. This function, together with the automatic change of stroke, can be set and stored from the control panel. The desired settings can be called up any time, providing certainty of results.
The presses use a forced and controlled lubrication system for all components, including guide block, bronze bushings, bearings and posts. Both lubrication pressure and temperature are controlled and, where needed, air-to-air heat exchangers or forced cooling systems for high speed applications are installed. The lubrication system used in MUFFATO PRESSES maintains the temperature between the top portion of the die touching the hammer and the lower portion in contact with the bolster plate uniform. Temperature, pressure, and filter blockage are all digitally controlled and can be displayed on the operator panel with their corresponding alarms. The oil circuit and related recovery system are designed to avoid any outside contamination. This extends the life of the lubricant and ensures a clean bolster plate and die.
The electrical system includes both press control and starting systems. A closed, ventilated cabinet holds the entire electrical system and can be conveniently placed in a separate position, without getting in the way of the personnel’s operations on the press. The control station is next to the cabinet and consists of a console with touch screen panel displaying all the needed information: speed, current stroke, hammer position, bolster plate-ram distance, operating temperatures and pressures, alarms, power absorbed by the die, motor current consumption, angle position, and electronic cams.
The touch screen panel supports remote connectivity inside the company (between office and plant floor), to monitor production and exchange text messages with the operator, and with our technicians, who will get timely information on the reasons behind any breakdown and come to the customer’s site prepared to deliver the fastest solution to the problem. In addition, the technology makes it possible to install software updates online, avoiding the need to send parts or personnel. The customer’s prior permission to access their system is required each time, so that complete confidentiality and custody of proprietary data and technologies is assured.