The type of
equipment used for cutting metal, concrete, brick, stone - cutting discs. With
all their advantages, they are not durable, so you should not purchase them
with a margin, but immediately before use.
Using and applying circles
Cutting,
grinding and grinding discs are widely used in the processing of various materials
on angle grinders of various sizes and stationary machines.
- Cutting - used for cutting metal, stone and
building materials.
- Grinding - used to treat surfaces to the
desired cleanliness, and using grinding discs, surface defects of parts and
welds, in particular, metal spatter, are removed.
When
choosing cutting wheels, it should be borne in mind that their effective use
can be achieved only with the correct selection of tools for a particular
operation. In the manufacture of these elements, various abrasive and bonding
materials are used to obtain different properties and determine the purpose of
the disc. For example, cut-off wheels contain larger abrasive particles and a
much softer composition than grinding wheels, which allows faster material removal
at the point of cut by generating new, sharper particles and increasing cutting
speed. A harder bond and a smaller particle size provide a gradual finish and a
higher surface quality, which makes it possible to better withstand surface
loads and is used for grinding. At the same time, aluminum oxide is used as an
abrasive head for steels and alloys, and silicon carbide for cast iron and
non-ferrous metals.
Marking and material for
making cut-off wheels
To
facilitate the selection of the tool, the marks on the surface of the product
indicate:
- Abrasive grade: "25A" - white
corundum, "14A" - normal electrocorundum;
- Dimensions in mm: outer and inner diameter and
thickness;
- Purpose and material for which it is intended,
for example: "cut-off", "steel";
- Bundle type: "BF" means bakelite
bundle;
- Permissible rotation speed, for example 80 m /
s - optimal and maximum in value;
- Maximum number of revolutions per minute;
- A hardness grade such as “K” means that the
disc material is moderately soft.
- Dimensions - outer and landing diameter
(22.23mm);
- Expiry date or production date (on steel inner
ring);
- Safety requirements.
An
important feature: no scorch is allowed for stainless steel. When overheated,
alloying additives burn out and stainless steel turns into ordinary steel, and
a corrosion process can begin at the cut site. It is important to consider this
when choosing a cut-off wheel and carefully read the information on the
packaging.
Bundles of abrasive wheels
Various
types of binders can be used in discs: metal, ceramic, vulcanite and bakelite
materials. For the production of cutting and grinding wheels, a bakelite bond
is used. It is a mixture of resins with different properties responsible for
strength, flexibility and elasticity, which is especially important for thin
cut-off wheels.
In addition
to the abrasive itself and bakelite binder, the rim includes fillers for
various purposes. Each manufacturer has a different composition of fillers and,
of course, is kept in strict secrecy.
Another
important element of which the cut-off wheels are composed is the fiberglass
mesh. Gives the necessary strength: without reinforcement with nets, the
element will inevitably scatter into the smallest particles. The mesh also
prevents side load breakage, which is inevitable when working with angle
grinders. Cutting discs have at least two links, and stripping discs have
three.
The thicker
the mesh, the stronger the element. However, the thickness of the mesh reduces
the amount of abrasive and therefore the efficiency of the tool decreases. The
manufacturer is forced to look for the optimal ratio of thickness and hardness
to ensure sufficient performance and strength.
How to choose cut-off
wheels?
When
choosing a disc, you need to answer three basic questions.
- What kind of material will you cut?
- What is your Bulgarian?
- Experience with cutting tools.
Often when
buying, we are faced with a choice: monetary benefit or product quality. The
market offers a large selection of products in various price categories. But
this is just an illusion of real choice. Professionals use such a concept as
the cost of one cut. The indisputable advantage of expensive discs is their
reliability, which is important when working with a grinder. Artdeko®
recommends making a balanced choice and not forgetting about your own safety
when working with cutting tools and tools.