Modulhard’andrea
High precision modular toolholders.
What is MHD’?
A modular toolholder system for boring, milling, drilling, tapping.
A rigid high precision system, conceived and manufactured with the most advanced design and production facilities, backed by an experience over many decades in boring operations.
A system of extreme flexibility and simplicity suitable for machine tools, machining centers and flexible manufacturing systems.
A system for machining to closest tolerances with a high degree of surface finish.
A system with internal coolant supply in all its components.
A system available in 11 sizes with full interchangeability of all components.
The MHD’ coupling is the heart of the tool system as it ensures utmost rigidity and concentricity during milling and boring operations. This is achieved by the (patented) cylindrical-conical fit and by a radial expanding bolt for clamping and driving.
Arbors Extensions Reductions
Arbors.
Arbors are manufactured in accordance with DIN 69871 A-B, MAS 403 BT, DIN 2080, ANSI-CAT, DIN 69893-A, ISO 26623-1 and are made of carburized steel, hardened and ground to AT3 tolerance.
Arbor sizes MHD’ 80, 110 and 140 are recommended for heavy milling operations and for bores deeper than 250 mm and exceeding 125 mm in diameter. Special arbors are available upon request.
Extensions.
Extensions of various lengths are available for each MHD’ size, which make it possible to optimize the desired machining depth.
Reductions.
MHD’ components of a smaller size can be used by means of adaptor sleeves which allow greater interchangeability and ensure tool stability.
Carbide bars
Carbide bars for deep-hole machining.
D’Andrea solves the deep-hole boring machining by means of a wide program of BMD carbide bars having diameter 16, 20, 25, 32 mm diameter and ending with MHD’ arbor.
BMD bars are built in three different lengths for the machining of holes, whose depth is 6.3, 8 and 10 times the diameter/bar. On BMD bars can be mounted: TS double-bit roughing heads, TRD-TRC-TRM Testarossa finishing heads, PE chucking tools for ER collets and GRINTA milling heads.
Balancing rings
The BLC balancing ring, with simple positioning of the two incorporated graduated counterweights, makes it possible to accurately and inexpensively balance the toolholder on which it is mounted.
The use of the BLC ring provides the following advantages:
– improved accuracy and surface finish
– considerable extension of tool life
– considerable extension of the machining center spindle life
– drastic reduction of vibrations and noise level in the machining center.
The purpose of balancing a toolholder is to improve the distribution of the masses of its body so that it rotates without creating centrifugal forces above a prescribed limit.
The balancing operation for a toolholder has the aim of reducing the original unbalance to the maximum admissible level “G” prescribed by the ISO 1940/1 standards.
Double-bit heads
The double-bit heads are easy and extremely rigid thanks to the extensive serrated areas in contact between the bit holder seats and the heads, together with the constant distance between the seat clamping screw and the cutter.
USE
The diameter setting of the cutters should be carried out with tool presetting bench.
Two bit holders are used for roughing operations involving heavy chip removal.
The double-bit boring bars may include:
– two SSCC bit holders on the same plane and with the two cutting edges set at identical radial distance for high feed rate roughing operations.
– an SSCC bit holder and an SMCC bit holder not at the same plane and with the two cutting edges set at different radial distances for high cutting depth roughing operations.
– the boring bars are fitted with a single bit holder for roughing and finishing operations involving normal chip removal.
Double-bit boring crossbars
The BPS double-bit crossbars cover a working area from ø 200 – 2800 mm. The BPS double-bit crossbars are constructed in aluminum and mounted on a steel double-bit plate.
TRD: Double-bit Testarossa
The double-bit TRD heads allow both roughing and high precision finish thanks to their rigidity and the sensitivity of the sliding mechanism which can achieve radial correction of 5 micron. This can be carrier out directly on the machine and easily read on the vernier scale.
The main advantage of the TRD head is that it can be pre-regulated independently of the bit holders found on the slide. This allows both roughing and high precision finish work at the same time.
Testarossa TRC
High precision work to IT6 tolerance, with excellent surface finish, is achieved using TRC boring heads. These are very sensitive and radial correction of 5 micron can be effected directly on the machine and easily read on the vernier scale.
Testarossa TRM
The TRM heads in the D’Andrea Testarossa line have protective rustproof coating. High precision work to IT6 tolerance, with excellent surface finish, is achieved using TRM boring heads. These are very sensitive and radial correction of 1 micron can be effected directly on the machine and easily read on the vernier scale.
TR-Elettra
The TR-Elettra is a finishing head, where the radial displacement of the toolholder slide is viewed on a built–in digital display, providing the operator with maximum speed and accuracy of adjustment. The operating range of these heads is extensive: from 2.5 mm to 2,700 mm depending on the size of the head selected. The entire TR-Elettra range is also available as a kit, complete with all the accessories necessary for its correct use. TR-Elettra, uses the well-known D’ANDREA MHD modular system and the new PSC modular system as coupling systems, in accordance with the standard ISO 26623-1. The TR-Elettra is the digital evolution of the TRM, the famous D’ANDREA micrometre finishing head.
Double-bit crossbars for big diameter finish
The BPS double-bit crossbars cover a working area from ø 200 – 2800 mm. The BPS double-bit crossbars are constructed in aluminum and mounted on a steel double-bit plate.
Kit Testarossa
The Testarossa kits are supplied in a box with a wide range of toolholders, tools, inserts and service spanners.
Chucking tools
The complete program of D’Andrea modular adapters with MHD connection, which satisfies the various processing needs related to milling, drilling and tapping.
Combi-toolholders Weldon (DIN 1835 B) and Whistle Notch (DIN 1835 E) with axial adjustment screw.
PE: Collet chucks to DIN 6499 sizes ER 11, ER 16, ER 20, ER 25, ER 32, ER 40, including axial adjustment screw. Supplied without collets.
AM: Tapping chuck holders for high production thread cutting. Large length compensation in response to tension and compression. With quick-change clutch for tap holders with or without torque limitation.
PF: Universal milling cutter-holders for disc cutters and facing cutters.
CM: Toolholders with internal morse taper for tools with threaded bore to DIN 228-A and tang to DIN 228-B.
B16: Drill chuck-holders with internal taper B16 to DIN 238.
NS: Semi-finished toolholders for special tools with hardened and ground MHD’ coupling part and cylindrical part with hardness HRC 22-25.
ACR: Coolant chucking tools.
WINTOOL
Graphic generator used to quickly compose complete tools with MODULHARD’ANDREA parts, indicating dimensions, weight and the list of components.
