Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Some work requires a special tool intended for mechanical impacts with destructive power. Such an adaptation is a locksmith chisel. About him and will be discussed in the article.

Maintenance of chisels: appointment and tips on the choice

What it is?

Maineer chisel – shock-cutting device for metal or stone processing. It is made of instrumental carbon steel. Tool tip has a blade form.

The tool is multi-functional, but mostly applied to:

  • laying stones;
  • Metal cutting;
  • tile knocking;
  • “Cutting” Hats nails / rivets and like fasteners;
  • Twisting / twisting bolts and nuts with “linked” edges.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Device

The diagram presents the device for chisel joiner: 1 – head, 2 – rod, 3 – blade.

In general, the chisel is a straightar rod, in the context of which is a rectangular, round, oval or multifaceted form. It has sharpening on one side (working facility). Another end is designed for blows hammer. Protective “Mushroom” can be installed to ensure the security of the master while working on the chisel. This is a hollow handle with a side created from rubber, wood or plastic. However, it is necessary to take into account that only building options of the instrument are usually equipped with a protective mushroom. On the plumbing chisels, it is usually absent.

Maintenance of chisels: appointment and tips on the choice

The working facility has a bilateral sharpening with the main and secondary corners of the cut. To increase the resistance of the cutting cloth, it is slightly blinking. The shank and the working fabric of the chisel is necessarily subjected to thermo-condition.

Types and characteristics

There are about 20 different types of tool under consideration. List the most famous of them.

  • Chisel cleaned – Used for works with a non-steepe metal.
  • Chiseline Pick – It is used with pneumatic devices (jackhamge and rubble hammers).
  • Chiselous Crazzamesel – equipped with a narrowed cutting edge. Used for cutting down grooves or grooves in metal.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

  • Chisel groove – The subspecies of the Crantsmel with a figure cutting edge.
  • Crumpled blacksmith – installed on a long wooden handle (like a hammer). This allows you to remove the hand that holds the device, from the hot metal. Did not exclude use for cutting cold metal.
  • Scarpel chisel – more acute fixture compared to the usual model used for works with stones. The working facility of this option has a similarity with a spatula. It helps smoothly process the stone, mainly used by sculptors. The tool is equipped with a rubber mushroom that protects the masters not only from the strike hand, but also from the fragments of fragments.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

The main characteristics of the tool include the type of fixture, its purpose (for the processing of soft, medium hardness and solid metals). Also taken into account the type of shock part (cone or straight). The chisels are made in several variations of components of parts (according to the requirements of GOST 7211-86). Allocate tools with handle:

  • plane cross section;
  • oval cross section;
  • hexagon;
  • Loop cross section.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

By type of shock part there are options that:

  • conical working and shock part in width;
  • Direct work shock part in width.

Maintenance of chisels: appointment and tips on the choice

If the device is intended for cutting metals, with its creation, carbon steel grades U7, U8, U9, U7A, U8A, and T. D. If the tool is created for processing breeds, the structural versions of steel 45, 50, 50x, which additionally can be equipped with carbide plates, for example, from winning.

Chisel with a widdle attack is suitable for work with concrete, metal, various rocks. Such a chisel will serve longer than the device without a attack. It will also work longer without sharpening.

According to the technical requirements of GOST, the hardness of the chisel must comply with certain parameters. For a working surface on a length of at least half of the cutting edge for brands of steel 7khf, 8khf This indicator is 56-60 HRC. For U7a, 8khf is provided for 54-58 HRC. For the shock part at a length of at least one and a half more values ​​from the shock end for 7khf, 8khf installed norm – 41-46,5 HRC. As for U7a, 8khf, here the indicators are within 36.5-41.5 HRC.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

To create products, you can use other steel grades. The main thing is that the mechanical properties of the material in the processed state were no worse than the species described above.

Chisel must have a protective and decorative coating. According to GOST 9.306 and 9.032 It may be:

  • oxide with loosening, phosphate with sinking or chrome thickness of 9 microns;
  • Chrome 1 μm thick with a nickel sublayer, applied by a cathode reduction in a thickness of 12 microns;
  • A galvanized thickness of 15 μm with chromatization and phosphate, with the subsequent coloring surfaces of the chisel nitroglyphthali enamel of the NC132 of various colors in class II;
  • Cadmium thickness of 21 microns with chromatization;
  • Chrome 1 μm with nickel sublayer with a thickness of 14 or 7 μm.

Chisel dimensions can be different. Length varies from 100 to 200 mm, including options with indicators 125, 160 mm. Width of the working part can be 5-20 mm. As for the weight, light options can weigh from 210 to 380 g. Heavy (used for work with power tools) can weigh from 590 to 750 g.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Sharpening angles may also differ. For soft metals, products with a sharper corner are used (about 35 degrees). For solid metals, a larger angle is required (45-70 degrees).

Tips for choosing

Before you buy chisel, it is primarily to determine what kind of work it will be applied: construction or plumbing. The main difference in tools is available or the absence of a protective element, which was mentioned at the beginning of the article. Due to this, the dimensions are reduced, and the working area of ​​the instrument increases.

Also worth paying attention to the steel brand, of which the chisel is made. The list of recommended varieties of material is given above. The highest quality chisels have good strength. This reduces the risk of chopping particles of the blade when working, which makes the tool more secure. Chisel from soft types of steel or with an inaccessible canvas quickly come into disrepair.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Do not choose cheap models from little-known manufacturers, they may be poor-quality. Prefer proven brands.

How to use?

  • Before starting work with a chisel, you need to make sure the integrity of its working surface. To do this, it is enough to inspect the edge of the blade for the presence of cracks, chips and the like defects. In case of detection, it is not recommended to operate tools to avoid injury.
  • When working, be sure to use glasses and gloves. You can supplement the device with a protective rubber overlay, which will increase the security level of the wizard. Remember that the tool must be dry, otherwise it can slip out of the hand (it concerns both the hammer and the chisel himself). When working, it is necessary to carefully ensure that there are no extraneous.
  • Do not forget to mark the material. Thin, but large metal sheet can be chopped on anvil. Chisel is worth keeping vertically. If the workpiece is small, but it has a big thickness, it is better to hold it into vice. Sponges must be compared with applied markup. If the metal thickness is significant, then the markup line should be 4 mm above them. The hammer makes short and clear blows on the back of the chisel, located at the right angle.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

  • When working with metal sheets, take into account their appearance and thickness (sheets of high thickness should chop over several approaches). If you need to cut off a piece of wire with a chisel, do not try to do it in one blow, because the cut part can fly in a random direction, because of what you have to spend time on her searches. Better Make one light impact (barbar) of a small size and rub the piece you need, which in the end will remain in your hands.
  • Do not forget that the weight of the hammer should be greater than the weight of the chisel at least several times. Otherwise, the work will be a real problem: the hammer will sculpt from the surface of the shock part of the chisel, and the performance will be close to zero. It is also important to the state of the hammer, in particular, the reliability of its attachment to the handle. If during operation the shock part of the tool will drop out of the attachment, the risk will be injured.
  • Remember that the chisel must have the right sharpening angle. The harder metal, with which you need to work, the bigger there will be an angle. For cast iron, steel and bronze, sharpening angle 70 degrees are supposed. For medium soft and soft steel materials (brass, zinc, copper) – 60 degrees. For aluminum need a tool with an angle of sharpening 40 degrees.

Maintenance of chisels: appointment and tips on the choice

Maintenance of chisels: appointment and tips on the choice

Features sharpening

To carry out self sharpening, it is necessary to prepare a small tank with clean water, in which you will periodically place a preheated tool (in order to avoid softening its initial quenching). Sharpening is carried out on the ends of the emery circle. The blade of the chisel should be placed against the direction of movement of the emery circle (in order to ensure the spark of the spark down). Depending on the ambient temperature and the speed of the emery circle / stone, the chisel should be cooled from 30 to 60 seconds.

If you redistribute the edge, it can overheat and lose hardness. This will lead to the impossibility of treating solid materials. During sharpening, change the side of the contact of the cutting canvas, as the chisel has a double-sided descent. Periodic turning makes it possible to maintain the correct geometry. Sharpening can be carried out on the sandpaper, but it will take more time (in this case, the process is carried out by moving forward).

Maintenance of chisels: appointment and tips on the choice

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