Tag Archives: chamfer

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.

  1. 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.
  2. 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.

  1. Crushing: small crushing on the cutting edge is caused by low cutting edge strength, impact and hard points in cutting layer.
  2. 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.
  3. Thermal cracking: small cracks in the vertical cutting edge are caused by uneven cutting temperature, discontinuous cutting and uneven pouring of cutting fluid.
  4. 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.

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.

Poly crystalline diamond, PCD, drill bits, HSS bits, High-speed steel, HSS, PCB, solid carbide bits, cutting edge, high-speed steel, carbon-steel bits, high-carbon steel, drill bit grinder

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.