What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

Drills are used in many spheres of human life. A variety of them on the market just amazes. Newcomer before starting work should explore all types. In this article, we will talk about the drills of HSS, their features and regulations of the choice.

What is HSS drills and how to choose them?

What it is?

HSS, or HighspeedSteel (High Speed ​​Decoding – High Speed, Steel – Steel), – This marking means that the tool (drill, tap, milling cutter) is made of high-speed steel, which is understandable from the English translation of the abbreviation words. The material has a hardness from 62 to 65 HRC. If you compare with high carbon stools, it is a thinner metal, but with high hardness indicators. The name uses to all materials of the group, but most often it is P6M5. The alloy has an average performance, suitable for operations with metals, materials with strength less than 900 MPa, made of small cutters.

Most of the steels of the group contain tungsten – its share is pretty high. Also there are a lot of carbon. The advantages of this steel include strength and price, which is lower than that of carbide cutting products. In addition, they showed themselves perfectly as an inventory for intermittent cutting. The disadvantage will be the lower speed of the drill, if compared with the solid alloys with a tool.

Filter steel can be divided into types:

  • high-speed high-alloy steel;
  • Molybdenum (denote M);
  • Tungsten (denote T).

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

Types are formed by the type of alloying in alloy.

Tungsten now is less and less used, as it has a high cost, and is also the scarce constituent. Most often used steel type T1 (overall steel) or T15, which contains cobalt, vanadium. As a rule, the latter is applied with high-temperature work and with great wear.

It is clear from the name that in the materials of the M-group, such a dopping element prevails as molybdenum, as much or more contains tungsten and cobalt.

So, vanadium and carbon make steel even more resistant to rapid wear.

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What happens?

Drills are different forms. Each of them is applied in a specific area. All high-speed drills are needed for cutting for metal.

Spiral Suitable for creating holes in details from special alloys, wear-resistant steels, steels for structures with strength in the limit of up to 1400 N / mm2, both ordinary and hardened, from gray or maquette cast iron. It is used both in manual electro and pneumatic tools and in metal cutting machines.

Step drill Used to create holes of different diameters in various types of materials. The appearance of such a drill resembles a cone with a stepped surface.

Correated drill – Hollow cylinder, use to create holes in steel alloys and non-ferrous metals. Removes metal along the edge of the hole, leaving the core uncredited.

There are a large amount of diameters, forms, species.

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

Marking

HSS – This is a general marking for high-speed steels, HSS CO – for species containing cobalt. Steel has a hardness indicator from 63 to 67 HRC. Anticorrosion and acid-resistant, apply for large diameter tools and disk mills, for cutting iron, copper, brass and bronze, aluminum and its alloys.

If you stop on labeling, then there are the following variations of the designation:

  • HSS-R – low drill endurance;
  • HSS-G – means that the cutting part is processed by a boron cubic nitride, increased drill endurance;
  • HSS-E – steel with a fraction of cobalt, for complex materials;
  • HSS-G Tin – Tools with a surface treated with a composition containing titanium nitride;
  • HSS-G Tialn – Tool coated from nitride, aluminum, titanium;
  • HSS-E VAP – Marking of a stainless steel cutting drill.

Domestic manufacturers use other labeling. There are letters M and T under the numbers (for example, M1).

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

Tips for choosing

To select the desired drill, you need to pay attention to important moments.

  • Examine the characteristics of the material and the ability to drill so that the tool satisfies the requirements of the work performed.
  • Look at the color of the product. He can talk about how the metal was processed.
    1. Steel color shows that heat treatment has not been produced;
    2. yellow – metal is processed, the internal voltage in the material is eliminated;
    3. Bright gold aboutTon speaks about the presence of titanium nitride, which increases wear resistance;
    4. black – Metal processed hot steam.
  • Explore the labeling to find out the type of steel, diameter, hardness.
  • Learn about the manufacturer, consult with experts.
  • Learn tool sharpening.

Often drills are sold by sets, for example, with different diameters. The issue of acquiring such a tool requires understanding, for what purposes the drill is required and how many options can be used.

In the set, as a rule, there are running and rarely used tools.

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

What is HSS drills and how to choose them?

About how to make a fixture for sharpening drills on a grinder, look in the video below.

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