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A New Standard for Gear Shaving in High-Volume Applications

by Matthew Jaster, Associate Editor

The Raso 250 TP is able to chamfer, debur and shave gears up to 250 mm outside diameter in very short cycle times.

The Raso 250 TP is able to chamfer, debur and shave gears up to 250 mm outside diameter in very short cycle times.

Sicmat was founded in 1932 by B. Alberto Petrazzini, who created the organization to produce universal machine tools for the mechanical market, including radial drilling machines, shaping machines and hydraulic presses. By 1950, the rising automotive industry prompted the company to focus on more specialized technologies like gear shaving and chamfering. Today, thanks to continuous investments in R&D, Sicmat is among the leading companies in shaving technology worldwide, providing a wide range of product solutions for shaving, honing, chamfering, deburring and retooling/retrofits.

Recently, the company added a new, innovative shaving-chamfering machine to its high-volume lineup. The Raso 250 TP (twin power) is able to chamfer, debur and shave gears up to 250 mm outside diameter in very short cycle times. The ergonomic structure offers easy accessibility to both operators and maintenance staff and the vertical workpiece position in all machine stations allows for easy integration in automated lines and simplifies tooling changeover operations.

“Thanks to a rigid structure and advanced software in the Raso 250 TP, tool-workpiece synchronization is perfect,” says Alberto Miletto, Sicmat technical director at Sicmat. “The machine uses two electro-spindles—along with linear motors—that allow users to achieve top quality.”

During the development of this machine, Sicmat’s primary aim was the reduction of idle times together with high flexibility. A chamfering/deburring device can be fully integrated, allowing shorter machining cycles, reduced floor space, reduced investment and therefore a shorter investment pay-back time.

The design platform for the Raso 250 TP is characterized by its exceptional stiffness and resistance to vibration.

The design platform for the Raso 250 TP is characterized by its exceptional stiffness and resistance to vibration.

The Raso 250 TP has been developed on a new platform designed by Sicmat, which is also the base for its gear honing machine, the Grono 250. The characteristics of this platform are the constructive modularity, the exceptional stiffness—due to the bedplate in electro-welded steel filled with anti-vibration bond —as well as the noteworthy resistance against vibrations thanks to the utilization of head, frame and tailstock in cast iron.

Further features are the synchronization of the workpiece/tool axes, the 10 CNC-controlled axes as well as the integrated automation; the latter, together with the workpiece positioning in vertical axis in all machine stations, widely facilitates the integration of this machine in whichever production line.

In addition to the Raso 250 TP, Sicmat’s product line includes the following:

Raso 200: According to Sicmat, the Raso 200 guarantees performance levels and stiffness comparable to the ones of bigger sized machines, with considerably reduced overall dimensions. This machine technology allows users to shave gears with diameters from 6 to 200 mm and module from 0.8 to 5 mm. It is suitable for gears found in automatic gearboxes, motorcycles and pumps.

Raso 400: Thanks to its particular “C” structure, both massive and open at the same time, Raso 400 is a versatile machine tool that can shave gears and shafts within a wide dimensional range. It can be combined with every type of automation and integrate various ancillary operations. Its power and stiffness peculiarities allow the quick shaving of gears having large module and face width, such as gears of agricultural machines, earthmovers and industrial vehicles. It is possible to integrate chamfering/deburring, centrifugation and stamping units as well as workpiece identification systems.

Raso 600: The main characteristics of the Raso 600 are the wide range of machinable diameters, the high resistance to vibrations as well as the working cycle speed related to the size of the machined gears. In practice, the studied improvements for this machine consist of a reinforced bedplate developed in view of a vibrations reduction, an higher and stiffened frame unit, tailstocks suitable for the sizes of the parts to be machined as well as of a new direct drive kinematics of U-axis, allowing faster speeds in the positioning phase.

This gear checker report is of a workpiece shaved on the Raso 250 TP.

This gear checker report is of a workpiece shaved on the Raso 250 TP.

LCD 200: The Sicmat LCD 200 stand-alone linear chamfering/deburring unit is the fast and simple solution for gears to be chamfered/deburred. The chamfering-deburring unit is equipped with devices for workpiece/chamfering tools safe meshing as well as for the linear movement of the chamfering tools. Deburring is carried out by rotating carbide disks. Dry machining is allowed and self-contained coolant equipment available for wet machining. The LCD 200 unit can be connected to a Sicmat Raso 200 shaving machine.

Grono 250: Born from the G.R.E.T.H.A. (Gear Related External Teeth Tool Honing Application) project in cooperation with the Faculty of Engineering at Turin Polytechnic University, the “mission” of Grono 250 is to keep the advantages of the Raso range in honing. This means constructive simplicity and practicality for a lower initial investment together with lower exercise costs in the production process for the user. The main characteristics of Grono 250 are external toothing honing wheel design, easy accessibility for maintenance and operations, vertical workpiece axis for an easier link to automation, main machining axes operated by direct-drive motors and workpiece/tool synchronization.

Watch a video of the Sicmat 250TP in action.

For more information:
Sicmat
Via Torino, 35
10044 Pianezza (TO)
Turin, Italy
Phone: +39 011 9667348
www.sicmat.com