SU1160028A1 - Cutting bit for mining machines - Google Patents

Description

The invention relates to the mining industry, namely to a cutting tool for the executive bodies of mining machines.

Known cutters for mining machines, containing the holder with a working head having side, front and rear cutting edges £ 0.

The disadvantage of such cutters is that in the process of work there are dynamic loads on the front edge, which leads to a decrease in tool strength.

The closest technical solution to the invention is a cutter for mining machines, containing a holder and a working head in the form of a truncated body velocity of rotation inclined to the vector with the front and rear cutting edges H.

However, in the process of working with a known cutter, a significant part of the cutting energy is spent on the periodic dispersion of the rock and the formation of a dusty compaction core, which reduces the efficiency of destruction.

The aim of the invention is to reduce the energy intensity of the cutting process

This goal is achieved by the fact that in the cutter for mining machines, containing the holder and the working head in the form of a truncated body of rotation inclined to the vector of the plane of rotation with the front and rear cutting edges, the working head is truncated from the rear cutting face, and the surface of the front cutting face is formed rotation of the curve of the form y = k, e ('around an axis coinciding with the vector of cutting speed, where e is the base of the natural logarithm; k ₄ and are the coefficients of the shape of the curve, varying respectively from 1 to 3 and from 1 to 5.

FIG. 1 shows a cutter for mining machines, side view; in fig. 2 is the same, isometry (mesh hatching - carbide head, retouching - option of fixing the head to the rod); in fig. 3 - change the character line of curvature described by the function "y = K, e _depending on _the values of the coefficients k, and K _2; in fig. 4 is a graph of vector decomposition of cutting forces on top of 160028 2

of the cutter £ Ϊζ-Κ_2 -, Κί ', Σ7β, =

= I, + ·, Σ8; = β; + TH _A) ); on

FIG. 5 is a graph of the decomposition of cutting forces on the surface of the proposed

5 incisors with equal angles of "dip" and "reflection" of these forces

I ₂ “, to, -; k, =;

V *;>

In addition, in FIG. 1 marked:

10 a - cutting furrow width; B is the depth of the cutting furrow; B is the width of the tool; <X, is the angle of inclination of the longitudinal axis of the holder to the axis; Δ Н is the excess of the center of the working surface of the cutter 15 cent above the surface of the cutting groove / a 'is the cutter reach in the direction of cutting; β and £ ₂ are the angles of unit rock chips; e- base of natural logarithms. FIG. 4 and 5 - B, / =

20 “K2 ⁼ conditionally equal resistance forces of the destructive medium at the points of contact with the cutting surface; X, X ₂ , X ₃ are normals to the curve Y = k ₄ e "for values of K, and

25 к.2 respectively 1 and 2.

The cutter for mining machines contains a holder 1 and a working head 2 in the form of a body of revolution, truncated by plane 3 ,. inclined to the vector of “30” cutting speed ν _ρ and which is the back face of the tool. The front face 4 of the incisor is formed by a rotation of the curve of the form y = k., C '(***) ^ζ around the axis of the OS, which coincides with the velocity vector ν _ρ .

For cutting the rock, the cutter is installed in the working body of the mining machine (combine, drilling machine, etc.), with which the cutter is provided with an axial force to feed the penetration into the rock by the value H (thickness of the chip cut off by the cutter) (Fig. 1) and simultaneous movement of the cutter in the cutting direction (along the Y axis in Figs. 1, 2, 4 and 5) with: force P (Fig. 2), ensured

40

45

shedding chips.

The working surface of the cutter, performing the function of the fairing, almost completely eliminates the possibility of forming a compacted and dispersed particles of the rock to be destroyed on the core. To ensure the required cutting angle, the cutter sets3 1160028 4

at an angle (X to the axis Ζ, which, with the “length” · ρ36ο4βή of the part of the cutter e ”’, makes it possible to use the hind angle recommended by the practice in the range of 5-10 ° (Fig. 2).

In order to use when cutting (cutting) only effective for "flow around" part of the curve y *, i.e. exceptions to

• the operation of its upper wings Γ (Fig * 3) "of infinite" length, a part of the surface corresponding to the displacement: the origin of coordinates along the Y axis by the value D Y proportional to A b is extracted / cut (cut).

The application of the proposed cutter allows you to reduce the power characteristics of the cutting process.

M

1

I 160028

Fig.Z

Branch PPP "Patent’ ’, Uzhgorod, Project. 4 st.

Claims (1)

CUTTER FOR MOUNTAIN MACHINES, including a holder and a working head in the form of a truncated slant vector cutting speed by the plane of the body of rotation with the front and rear cutting edges, characterized in that, in order to reduce the energy intensity of the cutting process, the working head is truncated from the rear cutting edge, and the front cutting edge surface is formed _by rotating the curve y = e ^{ ** around the axis that coincides with the cutting speed vector, where e is the base of the natural logarithm; k, and the shape of the curve, varying respectively in the range from 1 to 3 and from 1 to 5. is smiling about about yo eo