SU1752529A1 - Method of ironing parts - Google Patents

Abstract

The use of finishing and hardening surface treatment of parts. SUMMARY OF THE INVENTION: A tool with a spherical working part is tilted relative to the normal to the surface of the part at the point of contact with the tool and is informed about the movement along the workpiece surface and the rotational movement about the tool axis, while the magnitude and direction of the smoothing speed is determined from the expressions V l / (vi + w R Sina f + a R2, arctgu - R sln / Wi + Q) R sin a; where V is the smoothing speed, mm / min i / - angle between the smoothing speed vector and the direction of the tool movement, hail, Vi is the speed of the tool moving relative to the surface being processed, mm / min; a) —the rate of rotation of the instrument, 1 / min, R — radius of the spherical part of the instrument, mm; a is the angle between the tool axis and the normal to the machined surface lying in a plane perpendicular to the direction of tool movement and passing through the point of contact of the workpiece surface with the tool, deg; / is the angle between the tool axis and the normal to the machined surface lying in the plane coinciding with the tool velocity vector and passing through the points of contact of the surface of the part with the tool, deg. 3 il. I Ј

Description

The invention relates to mechanical engineering and can be used for finishing and strengthening surface treatment of parts.

The known method of processing parts by diamond smoothing with a tool with a working surface in the form of a sphere converting into a cone, according to which the tool is set at an angle to the feed direction, which allows it to receive a rotational movement from the part by the smoothing process.

The disadvantage of this method is the impossibility of adjusting the speed of the ShHS-

The ironing of the surface parts 71a | H as the tool is brought into growth from the part under the action of frictional forces.

The closest to the present invention is a method of smoothing the surfaces of parts, according to which the tool with a spherical working part is tangent relative to the normal to the surface of the part at the point of contact with the tool and tells it to move to the workpiece's surface.

The disadvantage of this invention is that it does not allow regulation of the scrub with the smoothing out

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hoists in magnitude and direction, since the tool is driven into rotation by the action of frictional forces arising from its contact with the rotating part. The smoothing speed here does not depend on the angle of inclination of the tool relative to the normal to the surface to be machined, but is determined only by the speed of rotation of the part and the presence of possible slippage of the tool relative to the part.

The purpose of the invention is the expansion of technological capabilities by providing the ability to control the magnitude and direction of the smoothing speed.

The goal is achieved in that according to the method of smoothing parts, in which the tool with a spherical working part is tilted relative to the normal to the surface of the part at the point of contact with the tool, the tool is told to move along the surface and part / piece and rotate about its axis, the magnitude and direction of the smoothing speed is determined from the expressions

V / (Vi + a) R sin a) r + a R2 sin2 /

(about R sin /

  arctgVi + ft) -R.

where V is the smoothing speed, mm / min;

1 / is the angle between the smoothing velocity vector and the direction of tool movement, degrees;

Vi is the speed of movement of the tool relative to the surface being processed, mm / min;

ft) is the speed of rotation of the tool, 1 / min;

R is the radius of the spherical part, tool, mm;

but. - the angle between the tool axis and the normal to the work surface, lying in a plane, perpendicular to the direction of tool movement and passing through the point of contact of the workpiece surface with the tool, deg;

p is the angle between the tool axis and the normal to the machined surface lying in the plane coinciding with the tool velocity vector and passing through the point of contact of the workpiece surface with the tool, deg.

Figure 1 shows the scheme for determining the geometric parameters during smoothing; FIG. 2 is a definition scheme.

the magnitude and direction of the smoothing speed when the tool is tilted in a plane perpendicular to the direction of movement of the tool and passing

through the point of contact of the part surface with the tool; Fig. 3 is a diagram for determining the magnitude and direction of the smoothing speed when the tool is tilted in a plane that coincides with the tool moving velocity vector and passing through the point of contact of the surface of the part with the tool.

The method is carried out as follows.

The tool 1 with a spherical working surface is set at an angle p to the surface of the part 2 (FIG. 1). The inclination of the tool axis relative to the normal to the surface being treated causes

that its contact with the surface of the part is carried out at point A. Point O - the top of the smoothing tip

enter points lying on a circle of radius g, tool surface From ABC, formed by the tool axis, normal to the workpiece surface at the contact point A and radius g, we get

g AC AB sin sin R sin p,

where R is the radius of the spherical part of the tool;

p is the angle of inclination of the tool axis relative to the normal to the surface of the part at the point of contact in the plane under consideration.

If the tool were in contact with the machined surface at point 0, then the smoothing speed would be 2 times the speed of the incoming movement of the tool Vi relative to the surface of the part. Due to the fact that contact

of the tool with the part occurs at point A, here, in addition to the speed of translational movement Vi of the tool, the speed V2 from the tool rotation around its axis appears, the value of which is determined by the formula / 2-m r

When the tool is tilted by an angle, and the direction of velocity is V2e

or opposite to the direction of the speed Vi, depending on the directions of tool rotation and the inclination of the angle a (Fig. 2). In this case, the smoothing speed is determined by the sum of the speeds

 The instrument's inclination at an angle of ft speed / 2/3 is perpendicular to the velocity Vi and depends on the directions of rotation of the tool and the inclination of the angle / (Fig. 3). In this case, the rate of smoothing is determined from the expression + / 2b, and the angle между between the vector

smoothing speed and direction of movement of the tool - from the expression

V2rt

V arctg

In the general case, when the inclination of the 1G tool is carried out simultaneously in two planes at angles a and f, the value and direction of the smoothing speed is determined from the expressions

V-jITvi + Vk F + V2Jf, 2 °

V arctg v $$ - Considering the fact that VT, m i R sln a and V2 (i) R sin / 3, we get

V / (Vi + t - R sin ") 2 +" R2 sin2 /

25

, l arcta ft -R sin / 9 v arctg Vi + W.R. s | na

surface. This allows the directional control of the quality parameters of the surface layer of details: roughness, microhardness, residual stresses, etc., which largely determine the reliability and durability of their work.

Claims (1)

Invention Formula A method of smoothing parts in which the tool with a spherical working part is tilted relative to the normal to the surface of the part at the point of contact with the tool and is told to move along the work surface of the part, characterized in that, in order to expand technological capabilities by allowing the speed and speed to be controlled the tool is given a rotational movement about its axis, and the amount and direction of the smoothing speed is determined from ajeny thirty y - j / (Vi R sin a) 2 + Ј R2 sin / and) R-sin / V arctg v7 + o; -R-sin " In these expressions, the direction of the angular velocity (o and the reading of the angles ai / is taken to be positive in the clockwise direction. To determine the direction of the angle, it is necessary to follow the vector diagram of the velocities for each particular case. Example. When smoothing complex parts from a heat resistant alloy of type ZhS-6 with a diamond tool with a radius of a sphere of mm, the speed of movement of the tool relative to the part was mm / min. By changing the tool rotation frequency from 50 rpm to 200 rpm, the tool angle and inclination from -30 to 30 ° and the angle ft from -30 to 30 °, you can change the smoothing speed V from 244 to 3030 mm / min, and its direction (angle ip) is in the range of 158 °. The use of the proposed invention in comparison with the known ones makes it possible to vary the magnitude and direction of the smoothing speed at a constant speed of movement of the tool relative to the machined where V is the smoothing speed, mm / min; mp is the angle between the smoothing speed vector and the direction of tool movement, degrees; Vi is the speed of movement of the tool relative to the surface being processed, mm / min; ft - tool rotation speed, min 1; R is the radius of the spherical part of the tool, mm; a is the angle between the tool axis and the normal to the machined surface lying in a plane perpendicular to the direction of tool movement and passing through the point of contact of the workpiece surface with the tool, deg; (3) is the angle between the tool axis and the normal to the work surface lying in the plane coinciding with the velocity vector of the tool and passing through the point of contact of the workpiece surface with the tool, deg.