What are the differences between normal wear and abnormal wear of cutting tools?

Tools in the production process will encounter a variety of problems, the master of mechanical processing often asked, “why can’t I use this cutter for so little time?”

Under the condition of high temperature, the tool will be gradually worn and damaged by the chip friction of the workpiece. But how can we distinguish the normal wear from the abnormal wear?

Normal wear and tear

Normal wear refers to the wear pattern that gradually expands with the increase of wear over time. There are two aspects that are clearly indicated as normal wear.

Front wear: there is crescent depression wear at the front edge of the blade, which is formed by friction and high-temperature and high-pressure action during chip outflow.
Main rear wear: the main rear wear is divided into three areas. It is assumed that blade tip wear C zone, and wear loss VC is caused by low strength and concentrated temperature near the blade tip. In the intermediate wear area B, except for uniform wear amount VB, the maximum wear amount in the severe wear area is VBmax, which is caused by friction and heat dissipation difference. The boundary wear N zone, where the cutting edge and the surface to be processed wear VN, is caused by high temperature oxidation and surface hardening.

Abnormal wear

Abnormal wear is usually caused by tool damage caused by impact, uneven heating and improper use during cutting.

Crushing: small crushing on the cutting edge is caused by low cutting edge strength, impact and hard points in cutting layer.
Cutting edge: it is easy to crack at the cutting point or cutting point, with brittle cutting material, low cutting strength and heavy cutting load.
Thermal cracking: small cracks in the vertical cutting edge are caused by uneven cutting temperature, discontinuous cutting and uneven pouring of cutting fluid.
Collapse: in the process of cutting, the cutting edge lost its cutting performance under the action of high temperature and high pressure, resulting in the collapse of the front or tip and cutting edge.

sharpening machines for drill bit, buy drill bit sharpening machines, drill bit sharpening machines, drill bit grinder, drill bit grinding machines, drill bit grinder manufacturer

Buy sharpening machines for drill bits, please click here.

PURROS there are many sharpening machines. If your tools wear a little bit, you can use our tool grinder. Before you buy a new tool, you can use a grinded tool for a period of time to save manufacturing costs.

If you do not know our products, please feel free to ask. Our products include: drill bit re-sharpener, end mill re-sharpener, screw tap re-sharpener, lathe tool grinder, saw blade sharpener, universal(all-purpose) cutter grinder, universal(all-purpose) tool grinder, portable multi-purpose grinder for mill and drill, saw blade grinding machines, polish grinder vertical belt sanding machines, chamfer, air tapping machine, gear chamfering machine, universal(all-purpose) head, rotary table, etc. Continuously invent, improve in our management, provide professional and high quality products to satisfy and serve our globe customers’ needs.

Introduction to the hole cutting tools which commonly used in NC machining

Hole cutting tools used in NC machining are:

High speed rake angle oil hole twist drill;
Helical groove Centre Drill;
3 – flute Solid Carbide Drill;
S-type carbide drill bit;
Indexable carbide bit;
Carbide double edge boring tool;
Carbide single edge fine boring tool

In addition, some special industries of NC machining have their own often used hole tool. Such as the printed circuit board industry micro-cemented carbide integrated drill, refrigerator compressor industry integrated cemented carbide precision reamer and step twist drill.

Compared with the tools used in ordinary machine tools, CNC tools have many different requirements, mainly with the following characteristics:

(1) good rigidity (especially rough tool), high precision, low seismic and thermal deformation; Good interchangeability, easy to change tools quickly;

(2) high life, stable and reliable cutting performance;

(3) the size of the tool is easy to adjust, so as to reduce the adjustment time of tool changing;

(4) the tool should be able to reliably break the scrap or roll the scrap, so as to facilitate the scrap removal;

(5) serialization and standardization to facilitate programming and tool management.

When your tool is blunt, choosing to use a tool grinder can be very useful. Our drill bit grinder can repair all kinds of tools (drill bit re-sharpener, end mill re-sharpener, screw tap re-sharpener, lathe tool grinder, saw blade sharpener, universal(all-purpose) cutter grinder, universal(all-purpose) tool grinder, chamfer, air tapping machine, gear chamfering machine, universal(all-purpose) head, rotary table, etc. ). If you want to buy our products, please send us your requirements and cutter parameters first. We will help you choose the corresponding model.

PURROS One-stop supplier of drills and grinders

One-stop supplier of drills and grinders.
We provide you with a professional and complete solution of grinding drill bits.

Our products: drill bit re-sharpener, end mill re-sharpener, screw tap re-sharpener, lathe tool grinder, saw blade sharpener, universal(all-purpose) cutter grinder, universal(all-purpose) tool grinder, chamfer, air tapping machine, gear chamfering machine, universal(all-purpose) head, rotary table, etc. Continuously invent, improve in our management, provide professional and high quality products to satisfy and serve our globe customers’ needs.

Everything you need to know about Drill Bit Grinders

What is Drill Bit Grinder?

Drill bit grinder is a handy machine that is used to sharpen drill bit, so that makes you easily bore holes in a huge number of materials. Whether the drill bit is made by HSS or Carbide Steel, the drill bit grinder can do the job because of it has two types of grinding wheel of options: CBN and SD, CBN for HSS drill bit; and SD for Carbide Steel drill bit. Cutting-edge technology is used for the manufacturing of drill bit grinding machine as it ensures precision and accuracy when you use drill bits to bore holes in any materials whether items are metals or hardwoods.

Who can use a Drill Bit Grinder?

Any person, whether a pro at grinding or a novice. You can use this machine to sharpen drill bit in any situation and anywhere. It doesn’t require expertise or any particular skill set. Only the basic learning of functions and instructions of this machine is required for its operation.

Types of Drill Bit Grinders

There are numerous types of drill bit grinders available in the market. Each type has its own set of features and specifications. The accuracy and precision depend on the type. With the wide range of drill bit grinders available, you can easily find a type that is according to your needs. The most popular drill bit grinders are portable drill bit grinders as they can be easily carried from one place to another.Continue reading→

How to bring dull drill bit back to live?

Everything on a drilling rig directly or indirectly assists the bit in crushing or cutting through objects. Although there are almost limitless ways a drill bit can be used, which can either be for grinding a rock, puncturing a hole through irons or drilling through aluminum, all this are only possible when the bit is new and sharp. Most bits work by scraping or crushing through objects, or even both, while some bits known as hammer bits’ pound’s object vertically in much the same fashion as a construction site air hammer, and that is possible because of its general rotational motion.

Most drill bits used in making jewelry becomes dull with normal usage, and the worn cutting edges often make tasks even more difficult, resources consuming and can cause expensive accidents, which includes damage to jewelry and gemstones or even an injury to the body.

When a bit becomes excessively dull or stops making progress; the recommended thing to do is to change it, but what if there is no replacement at the moment or there is a limited supply of drill bit? The next thing to do is sharpen it.

Proper maintenance of a drill bit includes keeping it clean, sharp, and consistent usage at the bench.

Follow the outlined steps below carefully, and learn how to sharpen drill bits by hand. By the end of this article, you will inevitably turn your used, dull, and useless drill bit back into a hole blasting instrument at its prime.Continue reading→

The Notes of Lathe Sharpening by hand.

The Notes of Lathe Sharpening

Please note that operator should stand on the side of the lathe tool grinder, to prevent hurtful from debris if the grinding wheel is broken.
Keeping enough distance to hold the shank of lathe tool between hands, to tighten the waist with two elbows to reduce the shaking of the lathe tool sharpening.
During sharpening lathe tool, please place the lathe tool on the horizontal center of the grinding wheel, and the tip of the lathe tool is slightly upward about 3°-8°, when the lathe tool touches the grinding wheel that the lathe tool should be moved around horizontally.
During sharpening major flank face, the lathe tool shank should be shifted an angle to the left as major cutting edge angle; during sharpening minor flank face, the lathe tool shank should be shifted an angle to the right as minor cutting edge angle.
During sharpening arc of the tip, generally, holding the tip of lathe tool with left hand as a fulcrum, and at the same time, moving the shank of lathe tool with right hand.

Continue reading→