Reaming

Hello Readers, welcome to your own website to understand each and every topic related to manufacturing process where we transform complex content into simpler ones. In this article, we are focused to cover the meaning of reaming operation, reamer, different types of reamers, materials used for making reamers, advancements and how the reamers is held.

Define reaming operation?

Reaming operation is used to make an existing hole dimensionally more accurate that can be achieved by drilling alone and to improve its surface finish.

Which is the process that makes most accurate holes?

The following sequence of operations gives us an idea of the process which creates most accurate holes:
Centering.
Drilling.
Boring.
Reaming.
Holes are burnished and honed for better surface finish.

What is a reamer?

Terminologies of Helical reamer
Fig. 1 Terminologies of Helical reamer

A reamer is a multi cutting point tool which removes very little material and it has a straight or helical fluted edges.
On the diameter of a drilled hole for soft metals a reamer removes 0.2 mm of material; for harder metals, about 0.13 mm is removed.
Removing small layers can cause harm to the reamer or burnishing could happen inside the hole surface. In such situations honing is the best solution.
In general, reamer speeds are one-half those of the same size drill and three times the feed rate.

What are the different types of reamers?

Hand reamer
Fig. 2 Hand reamer


The reamers are classified as under.
(i) Hand reamer.
(ii) Machine reamers.
(iii) Parallel reamer.
(iv) Taper reamer.
(v) Reamers with straight flutes.
(vi) Reamers with spiral flutes.
(vii) Adjustable reamer.
(viii) Expanding reamer.

Hand reamer:
As the name suggests, in this process hand is used with reamer to surface finish the holes and remove the ovality.
To give suitable clearance the reamer’s cutting edges are backed off in the same manner as those of twist drills.
The materials used for making reamers are carbon or high speed steel. The main purpose of reamer is to provide good internal turning in the hole by placing a tap wrench on the squared end of the reamer.

Machine reamer:
Machine reamer are mostly used for slow speeds applications such as drill presses, lathes, vertical milling machines, etc.
Chamfering is done on the front side of cutting edge.
This type of reamer may have straight or tapered shanks and also a straight or spiral flutes.

Taper reamer:
For providing super finish to taper holes this type of reamer is used.
Taper reading is performed with straight or spiral flutes.
When a large amount of stock is to be removed, a roughing reamer is generally used.
To control size and provide smoothness to the hole a finishing reamer is used.

Spiral fluted reamer:
Spiral fluted reamer has better shearing action than one with straight flute. In the spiral fluted reamer chattering is eliminated by a shearing action.

What are the materials used for making reamers?

Reaming tools (reamers) are typically made of high-speed steels (Ml, MZ, and M7) or solid carbides (K2O; C2), or have carbide cutting edges. Reamer maintenance and reconditioning are important for hole accuracy and surface finish.

What are the advancements done in reaming process?

A further development in reaming consists of the reamer-a tool that combines drilling and reaming.
The tip of the tool produces a hole by drilling, and the rest of the same tool performs a reaming process.
A similar development involves drilling and tapping in one stroke, using a single tool.

How are the reamers held?

Reamers may be held rigidly (as in a chuck), or they may float in their holding fixtures to ensure alignment or be piloted in guide bushings placed above and below the workpiece.

CONCLUSION:

We have covered all the important concepts related to reaming operation. Hope you all are crystal clear with all the concepts mentioned here. If you have any questions please use the comments section to get in touch with us. Till then have fun and always keep reading!

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