RU2427453C2 - Piston ring fitting fixture - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed fixture comprises body intended for fitting one or several piston rings with the help of moving bush oriented over outer cylindrical surface. Said bush is provided with key to orient piston rings along lock planes and three rockers fitted in said body to lock rings axially and driven by three push rods moving in and outs of said body by cams of three-cam self-centering chuck. Note here that body outer surface on piston rings fitting side is tapered.

EFFECT: higher efficiency and quality.

2 dwg

Description

The invention relates to the field of mechanical engineering technology and is intended for the processing of piston rings on lathes, automatic lathes, including multi-purpose lathes.

Known mandrel for securing piston rings [1], containing a housing designed to install one or more piston rings based on the outer cylindrical surface using a movable sleeve.

A disadvantage of the known mandrel is the inability to:

1) the use of machine tools and numerically controlled machines in serial, large-scale and mass production;

2) carry out through processing of the outer surface of the ring without reinstalling it;

3) install two or more rings;

4) use for gravitational oriented automatic removal of the piston rings during their subsequent movement along the loading-orienting device to another type of technological equipment.

The objective of the invention is to increase the productivity and processing quality of the piston rings, the reliability of their fastening, the suitability of embedding in automatic and rotor lines using loading and unloading-orienting devices.

This goal is achieved by the fact that the mandrel for fixing the piston rings, comprising a housing designed to install one or more piston rings based on the outer cylindrical surface using a movable sleeve, characterized in that it is equipped with a key for basing the piston rings on the lock planes and three located in the housing with rockers for securing the piston rings in the axial direction, driven by three pushers, moved in and out of the housing with a cam self-centering three-jaw chuck, the outer side surface of the piston rings is conical.

The machining of the functional outer cylindrical surface of a group of piston rings when they are based on the outer cylindrical surface and the planes of the lock allows a more uniform machining allowance for subsequent machining of the outer cylindrical surface of the piston ring and thereby improving not only the diametric and geometric accuracy of the outer cylindrical surface of the piston rings, but also reduce residual stresses in the material of the piston ring. The mandrel body on the side of the installed piston rings has a conical shape, which allows, after unfastening the piston rings, the yoke to move in a strictly directed position to the loading-unloading-orienting device under the action of gravity.

The essence of the device is illustrated by drawings, where Fig. 1 shows a general view of the device in a section (the device is symmetrical about the axis of the section), Fig. 2 shows a view A.

The present invention comprises a housing 1, in three slots of which the rocker arms 7 are mounted by means of the axes 10. A pusher 9 is connected to the rocker arm 7 by means of an axis 8. A key 2 is inserted into the slot of the housing 1. A cylindrical movable sleeve 3 is mounted on the outer part of the housing 1, which is axially limited movement by screw 4. To translate the movable sleeve 3 to the base position, a compression spring 5 is used, the compression force of which is regulated by nut 6.

The device operates as follows. The cone 1 housing 1 is mounted in the machine spindle. Pushers 9 are threadedly attached to the cams of a three-jaw self-centering cartridge. The cams of a three-jaw self-centering cartridge are retracted to the periphery of the cartridge, thereby the pushers 9 are pulled out of the housing 1. The rocker arms 7 are rotationally moved relative to the axes 10. The clamping surfaces of the rocker arms 7 are retracted to the central axis of the housing 1. The movable sleeve 3 is located in the extreme right position. In this position, the mandrel is unclenched and ready to receive the installed piston rings. Piston rings 11 are based on the outer cylindrical surfaces along the inner cylindrical surface of the cylindrical movable sleeve 3, and are also based on the lock planes along the key 2. When the piston rings 11 are based, they enter the movable sleeve 3 with a certain force due to preliminary deformation in the radial direction of the piston ring. To ensure reliability of the base of the piston rings by moving the nut 6 creates the required compression force in the spring 5, which maintains a constant position of the movable sleeve 3 in the extreme right position when basing the piston rings. In this case, the compression force of the spring 5 should not be more than 20% of the maximum allowable effort to move the working bodies of the machine with a longitudinal feed of the cutting tool. The movable sleeve 3 can move in the longitudinal direction along the housing 1, however, to limit its movement, a screw 4 is used, which is included in the longitudinal outer groove of the housing 1. Next, the cams of the three-jaw self-centering machine cartridge move to the center of the cartridge, as a result of which the pushers 9 move inside the housing 1, rocker arm 7 are moved in the angular direction relative to the axes 10 and the clamping surfaces of the rocker arms 7 are retracted from the central axis of the housing 1, thereby clamping the lubricated piston rings. In this position, the mandrel is ready to handle the piston rings. When processing piston rings, the cutter moves the movable sleeve 3 to the left until it processes all the piston rings 11. The outer cylindrical surfaces of the piston rings do not mate with the inner cylindrical surface of the movable sleeve 3. Then, the cams of the three-jaw self-centering cartridge move to the periphery of the cartridge, pushers 9 are output from the housing 1, the rocker arms 7 open the piston rings, which along the outer conical surface of the housing 1 under the action of gravity move either from the processing zone, for a loading and unloading and orienting device for subsequent processing. Then the cutter is retracted in the radial direction from the mandrel and the cylindrical movable sleeve 3 by means of the spring 5 is retracted to the extreme right position. In this position, the mandrel is unclenched and ready to receive the installed piston rings.

The use of pushers and rockers, a key, a movable sleeve, a conical outer surface of the housing in the mandrel design improves the productivity and quality of processing of the outer cylindrical surfaces of the piston rings, because they are mechanically clamped, fall off from a horizontally located mandrel in an oriented form under the action of gravity and are based on the planes of the castle and the machined outer cylindrical surfaces of the piston rings.

The technical efficiency of the invention lies in the fact that it allows to increase the productivity and quality of processing by cutting the outer cylindrical surfaces of the piston rings.

Information sources

1. Copyright certificate 1138258, MKI V23B 31/40 - prototype.

Claims (1)

A mandrel for securing piston rings, comprising a housing designed to install one or more piston rings based on the outer cylindrical surface using a movable sleeve, characterized in that it is equipped with a key for basing the piston rings along the planes of the lock and three rocker arms located in the housing for fixing axial piston rings driven by three pushers moved in and out of the housing using the cams of a three-jaw self-center cartridge, while the outer surface of the housing on the installation side of the piston rings is conical.

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