SU614849A2 - Device for forming throat portions in tubes - Google Patents

Description

(54) DEVICE FOR FORMATION OF MOUTHS ON PIPES

one

BACKGROUND OF THE INVENTION The invention relates to machining devices (pipe cleaning, in particular for forming flanges.

According to the main author. St. No. 2,16599 discloses a device for the formation of pits on pipes, comprising a fixed base, a movable punch and a fixed sleeve located between them with a collar at one end.

In this device, the centering of the punch with the guide pin of the base is made only due to the width of the upper collar of the movable sleeve, which leads to a distortion and jamming at the moment of returning the punch to the inside of the pipe after the neck has been formed on it. An increase in the length of the guide collar of the movable sleeve leads to a decrease in the punch stroke, which does not ensure the formation of the minimum throat required for connecting pipes.

Removing the punch through the neck leads to cutting off the rubber rubber rings on the pin of the base.

The purpose of the invention is to improve the quality of the products obtained by eliminating the possibility of skewing the punch with a movable sleeve and cutting off the sealing rings during the formation of the neck on the pipe.

For this, the proposed device is provided with an additional movable sleeve installed between the movable sleeve and the punch with outer and inner shoulders at its ends, mated with the inner surface of the punch and the outer surface of the movable sleeve, and also located in the lower part of the punch centering abutment mated with the outer surface additional podtzhny of the plug.

FIG. 1 shows the described device, a longitudinal section of a general view; in fig. 2 - the same, section AA. FIG. I.

The device comprises a base 1 with a threaded socket 2 for connecting the pipeline and the channels 3 connecting the socket 2 with the cavity 4 formed by the ends of the base and the punch 5.

Between the movable sleeve 6 and the punch 5, an additional movable sleeve 7 is installed with the outer 8 and 9 inner flanges located at its ends, conjugated with the inner diameter of the punch 5 and the outer diameter of the movable sleeve 6, as well as the centering stop 10, conjugated with the lower nonforming frequent punch 5 and the outer diameter of the additional movable sleeve 7,

The mating guide surfaces of the guide stem of the base, sleeves 6 and 7 of the punch 5 are sealed with soft, for example rubber, rings 11.

The device works as follows.

The pusher is inserted into the pipe to be machined from its end by a punch 5 and the side of an oval cut previously formed in its wall. The zone of the pipe around the notch is heated to 9OO11OO C, for example, with an acetylene torch flame. From the pump, the non-combustible working fluid is supplied through the pipeline to slot 2 and through channels 3 is fed into cavity 4. Under the action of the pressure of the working fluid, base 1 abuts against the cold wall of the pipe, and punch 5 slides along sleeve 7, the distance h to the contact of the centering stop 1O with a collar 8 of the sleeve 7, carries the movable sleeve 7, passes an additional distance fl of the end of the inner shoulder 9 of the sleeve 7 until it stops against the collar of the sleeve 6, and then carries the moving sleeve 6 along, the distance fi from the lower end of the sleeve 6 see you plotnitelnym ring 11 of the guide base.

With this punch 5, the pressure of the working fluid is forced through the cutout in the pipe, bending its edges into the cylindrical neck. After the formation of the neck stop the flow of working fluid, the punch 5 upset

through the neck to the inside of the pipe and then removed from it. The guide shoulders 8 and 9 at the ends of the intermediate movable sleeve 7 and the centering stop 10 on the nonforming part of the punch 5 prevent opening of the sealing rings 11 during the neck formation on the pipe and eliminate distortions when the punch is set down after the neck has been formed, which increases the overall operation reliability of the device and simplifies its maintenance,

Practically, the total stroke of the punch is significantly lower than the sum of distances and pz I, which also protects the sealing ring 11 from cutting.

The use of the proposed device provides, in comparison with the known, the following advantages: - eliminating the distortions and jamming of the punch after the neck has been formed;

- sealing rings are prevented from cutting;

- increases the reliability of the device.

Claims (1)

Invention Formula A device for the formation of necks on the pipes by the author. St. No. 216599, characterized in that, in order to improve the quality of the products obtained by eliminating the possibility of skewing the punch with a movable sleeve and cutting off the sealing rings in the process of forming the neck on the pipe, it is provided with an additional sleeve installed between the movable sleeve and the punch with its outer and inner collars the ends mated to the inner-, the surface of the punch and the outer surface of the movable sleeve, as well as the centering stop located in the lower part of the punch, mated to the outer surface additional sleeve. tftat.J