SU1684059A1 - A method of preliminary shaping of cylindrical shafts - Google Patents

Abstract

The invention relates to stone processing technology and can be used in construction and mechanical engineering for the roughing operations of large smooth shafts, in particular press granite shafts of papermaking machines and cylindrical columns, and allows for improved productivity. This is achieved by the fact that on the shaft 1 along the edges, the excess stone in the form of angular scallops 2 is successively removed with a circular saw 3. 1 sludge.

Description

The invention relates to stone processing technology and can be used in construction and engineering for roughing operations of large smooth shafts, in particular granite press shafts of paper machines and cylindrical columns.

The purpose of the invention is to increase the productivity of the process by simplifying its implementation, eliminating manual operations and reducing diamond consumption.

Figure 1 presents a diagram of the implementation of the method.

The method is as follows.

In the drawing, the thin section shows the cross section of the shaft 1 and the contour of the workpiece of square cross section, and the thickened lines show the four tangents to the shaft of the plane, resulting from the cuts along the edges of the workpiece of excess stone in the form of angular combs 2 with a circular saw

3. After that, angular combs of smaller sizes remain with the vertices being the edges of the octahedron. At the next stage, scallops are cut along their vertices (ribs) with the formation of scallops of even smaller sizes and a twofold increase in the number of faces of the described polyhedron. Cutting in this order is performed while the scallops height exceeds the width of the diamond-bearing layer of the saw.

Example. Granite press shaft VPG1050x6300 (diameter D = 1050 mm, length L = 6300 mm) according to TU 26-08-598-82 is installed in the center of a lathe machine mod. 1A665, equipped with a power head, on the spindle of which a circular saw is fixed (Dn = 1250 mm) according to GOST 16115-78. The cut is performed in stages. At the first stage, angular combs are cut along the edges of the blank of square cross section along four planes tangent to the shaft to form the described octahedron. For this, the circular saw is installed at a distance from the axis of rotation equal to the radius of the shaft gu = 525 ^:, mm, and the workpiece is turned (by pressing the Turn product button) to a position where the diagonal of the square is horizontal. This is achieved when one of the vertices of the square touches the stop mounted in the tool holder of the machine at a distance from the axis of rotation equal to half the diagonal of the square (742 mm). In real production, when the cross-sectional shape of the workpiece is different from the square, the workpiece is brought into rotation (with a frequency of 1-5 rpm), and the emphasis is moved until it touches one of the vertices and at that moment the rotation is stopped. Likewise, segments of smaller scallops arrive at the next stages.

Claims (1)

Claim The method of preliminary shaping of cylindrical stone shafts by installing a square cross-section in the centers of the workpiece with subsequent processing of its surface with a circular saw, characterized in that, in order to increase productivity, the workpiece is processed along the ribs along planes parallel to the center line and spaced apart from it the radius of the shaft, with the formation of the described polyhedron, the number of faces of which doubles after each cycle, and processing is performed to the distance of the edges of the polyhedron from l lines of centers exceeding the radius of the shaft by no more than the width of the diamondiferous layer of the saw.