Cutter boring hard-alloy persistent and through: photo, dimensions, choice
The boring cutter is widely used in engineering and manufacturing. They are used for processing through and blind holes on the turning group of machines. Boring turning cutters help to achieve more accurate results in work, and also create a high frequency of processing. The tool sequentially removes layers of metal, which helps to expand the hole to be machined. the right sizes. Thanks to precise equipment, the result can be adjusted within tenths of a millimeter. If the boring tool is well sharpened and in good condition, then it can work with various metals, since it must always be more rigid than the workpiece. For reliability, it is always necessary to check its fastening, since an incorrect position can lead to breakage of the tool itself or a defect in the processing of the part.
The main emphasis in this cutter is placed on high performance in work. Typically, a boring cutter removes relatively small layers that help expand the hole, so speed and accuracy are important here, which in turn is reflected in the geometry of the product. The working surface is made wedge-shaped, as this helps to better cut into the material layer and deform it, removing chips of the proper thickness. Gradual chipping of the upper layer of the material brings the workpiece to the required state. The current standard, according to which the boring cutter is manufactured, is GOST 18872-73, which is intended for high-speed steel products, the smallest diameter of which reaches 14 mm. If the tool is intended for blind holes with a diameter of up to 6 mm, then this will already be GOST 18873-72. If the boring cutter is made of a carbide composition, then GOST 18882-73 for through holes and GOST 18883-72 for blind holes, respectively, will be relevant here.
photo: boring turning tools for metal
Types of boring cutters
The boring cutter can be made in several versions. The high-speed type is used for processing various light materials and corresponding alloys, which include aluminum, fluoroplastic, textolite and other materials.
For stronger and heavier compositions, monolithic, hard-alloy boring cutters or with inserts of hard alloy inserts are used. Such products can already work with bronze, raw steel, stainless steel, hardened steels and other materials.
All these varieties, in turn, are also divided by the type of holder, which can be square or round. In addition, there is also a division by purpose. According to the functions performed, a boring cutter for blind holes is produced, which is used not only for processing the inner walls of the hole, but also engaged in turning the bottom, along with its subsequent grinding. There is also a boring cutter, which is used for through holes. He works with parts with a cylindrical shape, or with through holes.
Now such a variety as a boring cutter with interchangeable plates is becoming very popular. They have various profiles and shapes, and most importantly, they come with a set of spare parts that can be used to fasten work plates and holders. Worn plates can be quickly replaced.
Main dimensions
Boring cutters for lathes, which are designed to work with through and blind holes, are manufactured according to certain dimensional standards.
| Height, mm | Width, mm | Length, mm |
|---|---|---|
| 16 | 16 | 140 |
| 16 | 16 | 170 |
| 20 | 20 | 140 |
| 20 | 20 | 170 |
| 20 | 20 | 200 |
| 25 | 25 | 200 |
| 25 | 25 | 240 |
| 32 | 25 | 280 |
Geometrical parameters of the boring cutter
The geometry of the working part of the product consists of three main angles, which in their sum always form 90 degrees. This includes:
- The major clearance angle that forms between the cutting plane and the flank of the tool. It reduces friction between the part and the back surface. The larger this angle, the lower the surface roughness that can be processed. Accordingly, the harder the metal, the smaller this angle should be.
- Taper angle, which is measured between the front and back surfaces of the tool. It affects the strength of the product, so the larger it is, the more reliable the boring cutter will be.
- The main front, which is measured between the front surface of the tool and the plane that is perpendicular to the cutting surface. With it, you can influence the size of the deformation of the removed layer.
photo: boring bar geometry
Choice of boring bar
The boring tool is selected according to what materials it will work with. First of all, it is a type for blind or external holes. Further, it is very important to look at the material that is being processed. If the basic geometric principle for this variety is approximately the same, then the materials of manufacture will be different.
“Advice of professionals! In no case should you use high speed steel products for processing stainless steel, bronze and hardened metal products. This will lead to rapid wear, so it is better to use only carbide materials here. ”
You should also not forget about the size, as some incisors simply cannot physically penetrate the hole. For constant active work, it is desirable to have a set of several products or choose a type with interchangeable plates. For the processing of blind holes, specialists select products that are two times smaller in diameter than the hole being processed.
Cutting conditions for boring cutters
The choice of cutting mode largely depends on the boring of the cutter, the diameter of the hole, the type of material and other factors. Depending on the diameter of the hole being machined, when working with through holes, the cutter must be installed below or above their center. At the same time, when working with blind holes, the internal boring cutter is placed clearly in the center so that there are no bosses in the end face.
Marking
There are several main brands of incisors, different in size and composition. For example, T15K6 - the material of manufacture belongs to the titanium-tungsten carbide group with a 15% content of titanium carbide and a 6% content of cobalt.
Manufacturers
- TaeguTec (South Korea);
- UkrMetiz (Ukraine);
- Kirzhachsky Tool Plant (Russia);
- CHIZ (Ukraine);
- Intertool (China).
Boring stop cutters: Video
IN turning business cutters are used to process metal blanks and parts different types, the choice of which is determined by the type of material of the part, the way of working with the workpiece and other conditions. To create non-through holes in workpieces or parts, use boring cutters.
Depending on the diameter of the holes to be made in the workpiece, the cutters are classified by size. Turning will then be of better quality if you choose the right geometry of the cutter. Correctly selected geometry cutter for blind holes will provide both better quality and speed of the process of working with metal.
Today our company is engaged in the complex provision of enterprises with all the tools necessary for metalworking.
Features and main characteristics
A boring cutter for blind surfaces performs its tasks in cases where reaming is not able to provide the required accuracy in creating holes in metal workpieces or the necessary cleanliness in the surface treatment of the workpiece.
Boring cutters for creating non-through holes in parts from hard materials differ from each other by the main angle in the plan ϕ(phi). Blind hole boring with right angle, entering angle also ϕ = 90°. This is the main characteristic that ensures the quality of processing. The main angle in plan ϕ is the angle that is formed between the normal to the turning plane and the front part of the tool at the point of its junction with the metal. This parameter is responsible for how light or heavy the chip flow will be, affects the deformation of the metal cut, cutting force, and the level of heat removal. The main rule that works for this parameter is its inverse proportionality to the hardness characteristics of the processed metal workpiece.
There are three types of cutters when boring blind holes in metal blanks:
- Cutters for rough work. In this method of processing, machines are assigned high speeds, chips come off the surface of a large thickness. For such work, cutters are chosen that are able to withstand high heat transfer and be sufficiently hard and impact resistant;
- Cutters for fine work. When processing, thin chips are produced, the machines operate at low speeds. The processing geometry is accurate;
- Cutters for ultra-precise boring.
Cutter standards for creating blind holes according to GOST 18873 - 73
This GOST standardizes the production standards for general purpose cutters.
They are made of high-speed steel alloy in two types:
- Vibration-resistant boring
- Boring with an angle ϕ = 5°.
This GOST also establishes the generally accepted marking of cutter tools for boring non-through holes.
Design features
The design parameters of cutters determine their classification into the following types:
- The cutter is whole. The holder and cutting element of the tool are made from a single piece of metal. Such tools are made and used quite rarely, usually from high-speed steel types.
- Cutter with soldered or welded cutting plate. These cutters are more affordable, since the expensive material is used only for the manufacture of the cutting insert (high-speed steel or hard alloys).
- Cutter with mechanical fastening of the plate or head.
- Composite cutting tool.
Also, the incisors are divided according to the direction in their filing: right and left. For the right, the cutting element of the cutter with a turn to the plane of the workpiece is located on the left, while for the left, on the contrary, on the right.
The specialists of our company LLC TD ChTS will consult on each type of cutter of interest (boring, grooving, shaping, and others) and will help with the choice.
Boring cutters are designed for boring through or blind holes already existing in products. The deeper the hole, the longer the round part of the cutter shaft should be. However, a cutter that is too thin and protruding far during operation springs and moves somewhat away from the surface being machined, reducing both the machining accuracy and surface finish.
Boring cutters are used to process holes. They work in less favorable conditions than external turning cutters. Boring cutters should have smaller transverse dimensions than the hole being machined. They get long. The overhang of the cutter must be greater than the length of the bored hole. Due to the low rigidity, boring cutters are prone to vibrations, which makes it impossible to remove large chips.
Khrapunovsky plant
Khrapunovsky tool factory (Khrapunovsky tool) was founded in 1960. Produces metal-cutting tools, including cutters. The production process is organized in such a way that it allows to fulfill non-standard orders.
Kanash plant
The Kanash cutter plant was founded in 1937. Since the first half of the 20th century, it has been producing high quality cutting tools.
Kirzhach plant
Kirzhach Tool Plant (KI3) was founded in 1934. Issues a wide range of metal cutting tools, includingsoldered turning cutters.
Turning cutters with brazed inserts made of hard alloys T15K6, T5K10, VK8, from T30K4 on order.
Prices are valid for purchases from 30 thousand rubles. Specify the final price with the manager.
Production of cutters with a plate made of P18 high-speed steel on order.
| Name | price, rub. |
|---|---|
| Boring cutters for through holes type 1 version 1 GOST 18882-73 | |
| Boring cutter for through holes type 1 version 1 12x12x130 | 70,8 |
| Boring cutter for through holes type 1 version 1 16x16x120 | 86,14 |
| Boring cutter for through holes type 1 version 1 16x16x140 | 86,14 |
| Boring cutter for through holes type 1 version 1 16x16x170 | 90,9 |
| Boring cutter for through holes type 1 version 1 20x20x140 | 119,8 |
| Boring cutter for through holes type 1 version 1 20x20x170 l=50 | 108,6 |
| Boring cutter for through holes type 1 version 1 20x20x170 l=70 | 113,3 |
| Boring cutter for through holes type 1 version 1 20x20x200 | 122,72 |
| Boring cutter for through holes type 1 version 1 25x25x200 | 162,8 |
| Boring cutter for through holes type 1 version 1 25x25x240 | 182,9 |
| Boring cutters for through holes type 1 version 2 GOST 18882-73 | |
| Boring cutter for through holes type 1 version 2 16x10x170 | 181,72 |
| Boring cutter for through holes type 1 version 2 16x12x170 | 141,6 |
| Boring cutter for through holes type 1 version 2 20x16x170 | 188,8 |
| Boring cutter for through holes type 1 version 2 25x16x200 | 236 |
| Boring cutter for through holes type 1 version 2 25x20x240 | 283,2 |
| Boring cutter for through holes type 1 version 2 32x25x280 | 696,2 |
| Boring cutter for through holes type 1 version 2 40x32x300 | 849,6 |
| Boring cutter for blind holes type 1 version 1 GOST 18883-73 | |
| Boring cutter for blind holes type 1 version 1 12x12x130 | 70,8 |
| Boring cutter for blind holes type 1 version 1 16x16x120 | 86,15 |
| Boring cutter for blind holes type 1 version 1 16x16x140 | 86,15 |
| Boring cutter for blind holes type 1 version 1 16x16x170 | 90,9 |
| Boring cutter for blind holes type 1 version 1 20x20x140 | 119,1 |
| Boring cutter for blind holes type 1 version 1 20x20x170 | 119,1 |
| Boring cutter for blind holes type 1 version 1 20x20x200 | 121,6 |
| Boring cutter for blind holes type 1 version 1 25x25x200 | 162 |
| Boring cutter for blind holes type 1 version 1 25x25x240 | 182 |
| Boring cutter for blind holes type 1 version 2 GOST 18883-73 | |
| Boring cutter for blind holes type 1 version 2 16x10x170 | 141,6 |
| Boring cutter for blind holes type 1 version 2 20x16x200 | 240 |
| Boring cutter for blind holes type 1 version 2 25x16x200 | 324,5 |
| Boring cutter for blind holes type 1 version 2 25x20x240 | 356,95 |
| Boring cutter for blind holes type 1 version 2 32x25x280 | 696,2 |
| Boring cutter for blind holes type 1 version 2 40x32x300 | 849,6 |
| One-piece boring cutter st.khv. for deaf people VK6M 5x10x45 | 60 |
| One-piece boring cutter st.khv. for deaf people 3.8x6x20x50 VK6M GOST 18063-72 version 2 | 50 |
| Boring cutter for through and blind holes D20x170 | 129,8 |
| Boring cutter for through and blind holes D25x200 | 165,2 |
| Fine turning cutter wide 25x16x140 | 236 |
| Fine turning cutter wide 32x20x170 | 295 |
