THE HONING

The honing is a work system which can give to the piece eccelent precision and roughness characteristics, really also used in eventual aesthetic treatments.

USE
This system is generally used:
a)when you want obtain particular precisions on pieces of any material, which have, after a normal tool working, wanted or no-wanted work allowance;
b) to effect very precise coupling.
When you know the honing, you will applicate this system in several fields because it assures quicker working times (compared with the traditional grinding) until 90% less, precision and roughness very higher, very cheaper production costs.

ADVANTAGES
As its ductility, adaptability and low costs, the honing system has gradually been sobstituing the traditional methods, and is also used on pieces which have had termic treatments which would cause piece deformations in order to obtain desired hardesses; you can also correct other eventual deformations like bellmut, barrel shape, rainbow, taper, waviness and ovality without modify the primitive axe.
This is possible because with the honing there is a wide contact between abrasive an piece, contrary to the grinding which has only two points; so you can to apply low cutting pressures and low rotation speeds avoiding to reach too high temperatures.
Moreover, it is not necessary to block the piece or aligne it extreme precise way… in fact, the piece can fluctuate until auto-aligne it self: the honer will adapt to these movings, respecting the primitive bore axe. So, the piece and the honer will be free to automatically find the right position; this will depend by the piece sizes: CAR Srl produces systems and machine where you have to block the piece, and machine where has blocked the honer.
The honing is used for large productions or small and no very high quantities of pieces.

REMOVALS
With the honing you can effect big material removals, also mm in particular cases as for ex. in the cylinder rebuilding for the extrusion of plastic, alluminium, etc… In these cases the honing is the best solution because, even if it requests higher times of working to remove about 10/12 mm, it avoids problems such as the high hardess to work, the high temperatures and the irregular abrasive consuption.
In fact normal removals with the honing system are about 1/100 until somes 1/10 of mm; in fact there are not rules about this matter, because you have to consider the previous workings to know the quantity of work allowance you have to let on the piece.

APPLICATIONS
The honing could be used for any size of piece and any bore diameter. Actually, CAR Srl starts from a diameter of 6 mm to diameter of 500 mm for a piece length of 10 m as standard production.
We have already systems and machines also for higher dimensions: this is considered for each customer necessity.

LAPPING
Until now, we have not spoken about the Lapping; this working is effected after we have honed the piece; with this system you can obtain surfaces with specular roughness and micrometrical removals; you will use the same honing machines and tools, but the grain, the hardness and the other abrasive characteristics radically change, together with the guide shoes alloy (if they are assembled)

USEFUL RULES FOR A CORRECT HONING