SU1523259A1 - Mandrel - Google Patents

Abstract

The invention relates to metal working and can be used to fasten hollow parts when cutting through screw grooves. The purpose of the invention is to expand the technological capabilities by increasing the processing operations by ensuring the removal of burrs. On the case 1 of the mandrel, a groove 4 is made along a helical line and a trapezoidal profile, which narrows towards the periphery of the mandrel. At the end of the housing 1 there are two diametrically opposed threaded holes for the screws. After installation on the case 1 of the part 5 with holes, the screws that secure the part 5 to the case 1 of the mandrel are inserted into the screws. After processing parts 5 it is removed from the mandrel. 5 il.

Description

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The invention relates to metal working and can be used to fasten hollow parts when cutting helical grooves.

The purpose of the invention is to expand the technological capabilities by increasing the processing operations by ensuring the removal of burrs.

FIG. presented mandrel, general view; in fig. 2 — node I in FIG. one; in fig. 3 is a section A-A in FIG. one; in fig. 4 is a section BB in FIG. one; in fig. 5 is a sectional view BB in FIG. 4 together with a lever mechanism for gripping and twisting the workpiece with a slotted screw groove relative to the mandrel.

The body 1 of the mandrel is made with a tapered end 2 and a center hole 3, with which the mandrel mates with the rear center of the machine.

A groove 4 is made on the outer surface of the support body 1 along a helical line and a trapezoidal profile, tapering towards the periphery of the mandrel. The angle between the side surface of the groove 4 and the normal to the longitudinal axis of the housing 1 is denoted by p (Fig. 2) and its value may be, for example, 3-6 °. A tubular piece 5 is installed on the mandrel, the left end of which is covered by the clamping jaws 6 of the lathe chuck. From the side of the conical end 2 of the mandrel on the left end of the part 5 is made of a longitudinal slit 7.

At the right end of the mandrel (Fig. 4), two diametrically opposite threaded holes 8 and 9 are made on the side of the centering hole 3, and at the end 10 of the tubular part 5 are diametrically through holes 11 and 12 through which the screws 13 and 14 pass. the ends of which are secured in the threaded holes 9 and 8. This secures the right end 10 of the tubular part 5 to the shipment.

It should be noted that the width of the grooves 4 in the outer diameter of the mandrel is equal to the width of the helical groove to be made in the inner diameter of the tubular part 5.

For relative turning of the part 5 relative to the housing 1, a lever mechanism can be used to grip (FIG. 5), which has pins 15 and 16 mounted on the ends of curvilinear levers 17 and 18 pivotally connected to each other with a finger 19. The diameter of the fingers 15 and 16 is made with a smaller diameter of the holes 11 and 12 in the tubular part 5.

Getting through screw surfaces on tubular parts using the proposed mandrel is as follows.

The mandrel of its conic end 2 is matched with the conical hole of the spindle of the lathe. Before installation on the mandrel 3, the parts 5 cut through the longitudinal slots 7 and drill two through holes 11 and 12, the axes of which coincide and are diametrically opposed.

After this item 5 set on

The mandrel and its right end are connected with screws 13 and 14 to the right end of the mandrel, and the left end is fastened to the body 1 of the mandrel with the cams 6 of the lathe chuck.

When the spindle is rotating, the mandrel with the tubular part 5 is also in a rotational motion. As a result of the longitudinal movement of the cutter with a feed S equal to the pitch of the cut through threaded groove, and as a result of the interaction of the cutter with the body of the tubular part 5, a groove groove is formed on it. In this way, a through groove with side through helical surfaces is cut through several passes.

After the formation of the through surfaces in the part 5, the rotation of the spindle with the mandrel is stopped, the cams 6 are retracted in the radial direction, and the screws 13 and 14 are unscrewed from the threaded holes 9 and 8. After that, the fingers 15 and 16 installed

5 at the ends of the levers 17 and 18 are inserted into the holes 11 and 12, the free ends of the levers 17 and 18 are brought closer together by applying a small force P to them (Fig. 5).

The part 5 is rotated relative to the fixed mandrel. As a result of such turning by sharp screw edges of the mandrel formed by a thread of a trapezoidal profile with an angle p between the side surface of the groove 4 and the normal to the longitudinal axis of the housing 1, the internal burrs are eliminated (cut)

5 to the diameter of the part 5 formed as a result of cutting through screw surfaces. This results in improved processing quality. After complete deburring, the rear center of the machine is pushed back.

0 to the right and the workpiece 5 is removed from the mandrel. Thereafter, a new tubular piece 5 is mounted on the mandrel, and the entire process described is repeated.

The treated steel part 5 of resilient material can be used as a torsion element or compression spring, and subsequent longitudinal cutting of the treated plastic part 5, such as a disk cutter, forms split plastic rings, which can serve as sealing elements in

0 gas compressor installations. In such rings, the industry has an acute need.

Claims (1)

Invention Formula A mandrel comprising a housing with a cylindrical outer surface and with a center hole at the end, characterized in that, in order to expand the technological capabilities by ensuring the removal of burrs, on the outer cylindrical surface a groove of the trapezoidal profile is made along a helical line tapering towards the periphery of the housing , and at the end of the housing, two diametrically opposed threaded holes are made at the centering hole side to accommodate the screws inserted into the mandrel. / () FIG. 2 figs (rigging 77 15 eleven sixteen 18 5