SU874274A1 - Method of milling bodies of revolution - Google Patents

Description

(54) METHOD OF MILLING THE BODIES OF ROTATION

one

The invention relates to mechanical engineering and can be used in the roughing, semi-finishing and finishing treatment of surfaces of bodies of revolution, for example, of a shafts type.

Known methods of milling. Bodies of rotation of a cylindrical mill, in which the product is rotated, and the mill is rotated and moved along the axis of the product 1.

However, when machining surfaces of revolution by known methods, a rather complicated kinematic milling scheme is used, which excludes the possibility of changing the angle of cutter setting between the tool's axis of rotation and the plane perpendicular to the axis of rotation of the product. In this connection, this method with a relatively high productivity is characterized by a low machining accuracy.

The purpose of the invention is to improve processing accuracy.

To achieve the goal, the milling cutter is installed at an angle

a plane perpendicular to the part’s axis

OS from gssov - | -. (, -L),

where b is the milling width; t - allowance for processing; Dl. - diameter of the workpiece surface in the specified 10 nominal section.

FIG. Figure 1 shows the kinematic scheme of the proposed method; in fig. 2 is a diagram of the installation of the cutter relative to the part; in fig. 3 is a section A-A in FIG. one.

15

The proposed processing method is characterized by the fact that parts 1 report rotation through the spindle.

2 (circular feed), a milling cutter 3 having a 2Q outer diameter, imparts a rotation of the PF through the spindle 4 (main cutting motion). The milling cutter has two straight feeds: the longitudinal Spp along the product axis and the transverse Sp in

25 of the end plane of the part 1, which provides a generator of any shape. To remove the allowance value t the initial position of the cutter

3 should be such that

30, the outer surface of the milling cutter 3 will have a contact point & kta with the finished surface of the part 1 in a specific end section. The longitudinal feed can be considered as a movement, ori parts related to one revolution of the part (DB), as well as to the rotation of the milling cutter 3 at the angle between two adjacent teeth (Sj) ..

The tool rotational speed determines the minute feed rate S S Z. hpf, where ZM is the number of teeth of the cutter, or 5 n ().

The If / Id ratio determines the circular flow, which characterizes the formation of geometric microroughness R Raci, in the cross section (circumference in section A-A)

.. M, -1 (ml) ()

-f

I 2 L

-Groshch- 2 1sofs / 2; (YAA | Ifu

When milling a part with a given accuracy, the DF cutter is set so that its axis of rotation forms an angle oL with the face plane of the part, the magnitude of which does not affect 1 2 times. The angle is limited by the specified milling power depending on the cutting conditions, the material of the part and the tool, and also from the depth t and the milling width b.

To determine the permissible possible 1 magnitude of the angle oL, you must use the ratio

Qt -arcco / b) r / t (DrA- -t), U)

The error in the shape of the part can be significantly reduced without reducing the productivity of the processing, determined by the feed S (J) of the part, as is evident from the ratio

l - , SS С05.Г (... D | p

Claims (1)

Invention Formula . The method of milling the bodies of rotation of a cylindrical mill, in which a part is rotated, and a mill is rotated and moved along the axis of the tool, in order to increase the machining accuracy, the mill is set at an angle ot to the plane perpendicular to the axis of rotation of the part, equal to oL-arcco5 (.Vt ()), where b is the milling width; t - allowance for processing; Dj .. - diameter of the workpiece surface in the specified section. Information sources, taken into account during the examination 1. Markhasin E.L. and Petros nts A.A. Milling bodies vrgeni. M., Mashgiz, laeo, p. 10-11.