SU893341A1 - Drift - Google Patents

Description

(54) DORN

one

The invention relates to devices for: distribution of pipes by pressure treatment, in particular for sealing pipes into fittings by the method of deforming - distribution of pipes by curving, and can be used in aircraft manufacturing, chemical, energy, shipbuilding industry and other branches of mechanical engineering.

Known mandrel containing attachment part and the working part with a pin on the end, impregnated with grease ruff mounted on the pin in front of the toe of the working part of the mandrel, and the locking element - the pin is NOT the end of the pin. Moreover, the ruff is made out in the form of a circular metallic brush with a size smaller than the internal diameter of the sleeve - the pipe and the working diameter of the mandrel.

The lubricant is introduced into the working contact zone in such a device due to rotation of the ruff during the operation of the mill, due to the centrifugal force of the lubricant being sprayed on the inner surface of the pipe before the experiment {1.

A disadvantage of the known device is that it does not provide cleaning of the surface pipe that interacts with the mandrel. In addition, this constructive solution is unsuitable for introducing lubricant into the working area of the tool in case of burnishing, in which the tool does not rotate.

The purpose of the invention is to improve the quality of products, the working life of the mandrel by cleaning and increasing the efficiency of the lubricant coarse when it is embedded in the reinforcement by dispensing the pipe with a pulsed (shock) mandrel.

This goal is achieved by the fact that the mandrel, the containing connecting part and the working part with. The hairpin on the end, the impregnated mucous ruff mounted on the hairpin in front of the toe of the working part, and the locking element located at the end of the hairpin, is equipped with a sleeve made of a material with a high specific weight, which is mounted on the hairpin in front of the ruff. with the possibility of axial movement, with this ruff made in the form of an omentum of elastic porous material, the outer diameter of which is equal to the inner diameter of the pipe being processed. In addition, at the end of the toe of the working section of the mandrel, butt spouting was made, and at the end of the sleeve, a blind hole with a diameter equal to the outer diameter of the locking ring and a depth of at least half the thickness of the locking ring was made for the locking ring. Ensuring cleaning and increasing the lubrication efficiency of the inner surface of the pipe before the tool in the process of dispensing the pipe with a pulse (impact) mandrel achieved by the proposed mandrel design improves the quality of the working part and working life of the working part in contact with the tube and, therefore, the mandrel itself. Due to the fact that during pulsed (shock mandrel mandrel, repeatedly repeated jump-like acceleration is reported, in particular due to the shock effect on it, installation of a sleeve with a relatively large inertia in front of the ruff) results in repeated intermittent axial compression of the brush that is placed between the working part of the mandrel and a sleeve that is synchronized with the displacement (penetration) of the mandrel into the pipe.Thanks to the ruff in the form of an omentum of elastic porous material impregnated with grease, it is achieved, firstly, intensively pulsating compression of the gland to the inner surface of the coarse, facilitating cleaning of the pipe, and, secondly, squeezing grease from the pores of the gland to the surface of the pipe in front of the mandrel when it is inserted into the pipe. Moreover, the sleeve is made of a material with a large specific gravity (mass) due to its increase inertia contributes to an increase in the efficiency of cleaning and lubrication of the pipe, which is especially important for incorporation into pipes of small diameters.In the intervals between pulses, due to the elasticity of the ruff material, it is spread, which improves the Cleaning the pipes due to its additional friction on her wall. In addition, due to elasticity, stable ruff parameters are provided, in particular, the volume of lubricant in its pores. When reused, and also over time, the mandrel is used. Executing the outer diameter of the gland commensurate with the diameter of the working part of the mandrel (equal to the inner diameter of the pipe) ensures backlash-free mating gland with the inner surface of the pipe, which guarantees the presence of a minimum static tension of the gland in the pipe and eliminates the idle speed of the weight relative to the mandrel to compress the gland in opposite m case. The optimization of the size 1 and 4 of the gland is essential, since it determines the useful volume of lubricant in the gland when introducing it into the tube cavity and the effectiveness of the lubricant. The drawing shows the mandrel, a general view. Dorn contains working 1 and connecting 2 parts, impregnated with grease ruff 3, mounted on stud 4 in front of the toe of working part 1, and locking element 5 at the end of stud 4. Dorn is equipped with a sleeve 6 of material with a bolt specific weight mounted on the stud 4 in front The shaft 3 is axially displaceable, and the ruff 3 is made in the form of a stuffing box made of an elastic porous material, the external diameter of which is commensurate with the diameter of the working part 1 of the mandrel for impermeable conjugation of the tube 3. The sock of the working part of the mandrel 1 is completed with an undercut at its end. The locking element 5 has the form of a spring-loaded split ring placed in the groove of the stud 4, and at the end of the sleeve there is made a blind hole 8 for the locking ring with a diameter equal to the outer diameter of the locking ring 5 and a depth of at least half the size of the transverse one. section of the ring 5. The device operates as follows. With a pulsed mandrel, due to the shock effect on the mandrel, it is repeatedly reported; repeated hopping acceleration, and due to the inertia of the sleeve b, repeated periodic axial compression of the ruff (stuffing box) 3 placed between the toe of the working part 1 and the sleeve 6 of the darp is achieved, which is synchronous with the movement of the working part 1 of the mandrel into the pipe when it is distribution. Due to compression of the gland 3, during the period of movement (insertion) of the working part 1 of the mandrel into the pipe, the gland 3 is pressed against the pipe wall, cleaning its inner surface and squeezing grease from the pores of the gland 3 which is applied to the pipe surface in front of the working part 1 of the moving mandrel and thus is inserted into the working contact area of the mandrel tool. The retaining ring 5 restricts the working movement of the sleeve 6. Taking into account the impulsive nature of the proposed mandrel, making the locking element 5 in the form of a ring providing a circular stop for the sleeve 6 and the opening 8 in the sleeve that prevents the locking ring 5 from opening, eliminates the possibility of damage to the stopper element 5 and jumping off the sleeve 6 from the stud 4 at the burnishing, which increases the performance and service life of the mandrel.

Due to undercut 7 at the end of the toe of the working part 1 of the mandrel, extrusion and damage to the gland 3 are eliminated when inserting the toe of the mandrel into the tube, as well as during the embedding process, which helps to ensure the required operability of the proposed device.

Claims (2)

1. A mandrel containing a connecting part and a working part with a stud at the end, impregnated with a lubricant ruff, spliced on a hairpin in front of the toe of the working part, and a locking element located at the end of the stud, characterized in that, in order to improve the quality of the products, the health and service life working the mandrel by cleaning and increasing efficiency 93341 " pipe lubrication when it is embedded in reinforcement, it is equipped with a sleeve of a material with a large specific weight, mounted on a stud in front of a ruff with the possibility of axial movement of the pipe, at this ruff is made in the form of an omentum of elastic porous material, the outer diameter of which is equal to the internal diameter of the pipe being processed. 2. Dorn, according to claim 1, distinguished by the fact that at the end of the toe of the working part. The undercut is made, and at the end of the sleeve there is a blind hole for the locking ring with a diameter equal to the outer diameter of the locking ring and not half the depth of the locking ring. Sources 1shformshch1, taken into account during the examination 1. USSR author's certificate number 337168, a cl. B 21 B 25/02, 1970 (prototype).