JPS59127934A - Liquid pressure pulse forming apparatus of tubular article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to plastic metal working using instantaneous high intensity magnetic fields and pulsed-pressure transmission fluids. In particular, the present invention relates to a hydraulic pulse forming device for tubular workpieces of various diameters.

A magnetic pulse forming bag I,1 (I4. r Spr by Bθ1y et al.
avochnik po magnitoimpuls
noi obrabotkemetallev J -
o 77 words, Kharkov, 1977, p. 151) are known.

However, such a device has a diameter within a predetermined range;
Used only when deforming conductive tubular members. Conversely, when using this device to deform tubular members made of high-strength alloys that are difficult to pass through, there are many drawbacks (such as the need to use highly conductive coupling devices; (The mechanical strength of the working coil is insufficient), especially when deforming small diameter tubes.

Similarly, electromagnetic forming devices for collar-type applications (U.S. Pat. No. 3,618,350, issued 1971 No., Ot. 72-56) is also known. In the case of this device, the electromagnetic field of the induction coil is
The pressure transmission device compresses and acts directly on the forming member to deform the tubular workpiece. The device can act on materials regardless of their electrical conductivity. However, when deforming a high-strength metal or alloy tubular member, the wear rate of the elastic material acting as the pressure transmitting device is extremely high, leading to damage to the formed member and rendering the device unusable. Similarly, the wear resistance of the working coil for deforming tubes of small diameter (for example φ (22 mm)) made of high-strength materials is extremely low, so that the use of said device for deforming such tubes is rather problematic. There is.

Another drawback of the device, which limits its application, is its rather low efficiency during repetitive molding or correction operations. This is because after the first pulse a gap is formed between the surface of the already formed workpiece and the forming member, so that repeated forming or correction attempts are wasted.

Devices closest to those described herein are also known.

This is a hydraulic pulse forming device for tubular members (Inventor's Certificate No. 752,900 of the Commonwealth of Sogyet, Ot.

B 2 1 D 2 B/2 8), a chamber with a device for generating pulse pressure in a liquid medium and converting it, a closure member with a high-pressure passage, and the required geometry of the workpiece. and a shaping die, the die having an annular gap relative to the closure member to facilitate installation of the tubular workpiece. The purpose of the high-pressure passage is to communicate the interior of the chamber with the working space defined by the side surface of the closure member and the wall of the tubular workpiece. The device is also provided with a sump line for supplying liquid to the working space.

In the case of devices of this type, the pressure is concentrated by constriction of the passages and pulse pressures are created in the liquid by the shock wave of an explosion or by the energy due to the electro-hydraulic effect produced in the chamber.

The resulting pressure is transmitted via the liquid to the working chamber, and the tubular workpiece assumes the shape of a die.

However, said device has the disadvantage of poor stability of the power parameters, which is dependent on the properties of the working fluid, the wire used for detonation and the variation of the detonation characteristics, and the corrosion of the VTTI.

Another drawback is the loss of energy of the shock wave which is diffused in all directions and absorbed by the elements of the nosing, thereby reducing the efficiency of the device.

Moreover, since such a device must be equipped with a strong chamber with an intensifier tube and a shielding member, a large amount of metal is required for the manufacture of the device.

Providing a constriction passageway in the central part of the closing member reduces the metal supporting capacity of the part laterally, so that the closing member may separate, especially during the formation of tubular workpieces of small diameter (e.g. φ < 22 mm). As a result, the reliability of the device as a whole will be impaired.

The object of the invention is to provide a device for generating pulse pressures in a working liquid and converting them, ensuring directional propagation of shock waves in the working chamber when localized high-pressure pulses and extremely improving the power parameters. It is an object of the present invention to provide a hydraulic pulse forming device for a tubular workpiece, which has a stabilizing closure member and has a low metal consumption of the device.

The object of the present invention is to provide a device for generating pulse pressure in a working liquid and converting it, and a wall of a tubular workpiece that can be attached to a closure member and a side surface of the closure member. The chamber includes a chamber provided with the closing member and a high-pressure passage communicating with the working chamber, a supply pipe for supplying liquid to the working chamber, and a die spaced apart from the closing member, The device for generating and converting pulsed pressure in a liquid comprises, in the direction of the workroom, a multi-turn induction coil for forming a pulsed electromagnetic field and a highly conductive material cooperating with the induction fill. A work chamber constituted by sequentially arranging a lower plate made of aluminum, an upper plate made of a mechanically strong material, and a pressure booster plunger, and arranged in the closing member in which the high pressure passages have the same axis. It is an object of the present invention to provide a hydraulic pulse forming device for a tubular workpiece, which is characterized in that it communicates with a cavity located above the pressure increasing plunger.

Preferably, the base of the pressure booster plunger facing the upper plate contacts the upper plate at only one point and is interconnected to the pivotable egg.

It is also desirable that the base of the pressure booster plunger has a spherical cross section.

To increase the useful life of the device, the upper and lower plates are spaced apart from each other by a predetermined distance, the lower plate is formed as an annular disc member, and the walls of the antechamber support the lower plate. It is desirable to have an annular collar for this purpose.

In order to increase the air-tightness effect, it is desirable to provide at least one annular groove in which an elastic ring is fixed in the upper part of the closure member in which the tubular workpiece to be deformed is placed.

It is advantageous if the elastic ring has a curved outer surface when viewed in cross section.

It is desirable to provide a check valve in the liquid supply pipe.

The hydraulic pulse forming device for tubular workpieces according to the invention reduces the energy loss when the shock wave dissipates into the housing of the chamber, stabilizes the power parameters of the localized pressure pulse and increases its value, and the device reduce the amount of metal needed to produce

Other features and advantages of the invention will be explained in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention.

FIG. 1 depicts a hydraulic pulse-forming device for a tubular workpiece, which includes a chamber 1 containing a plurality of turns of an induction coil 2 for inducing an instantaneous magnetic field. Adjacent to the induction coil 2 is a lower plate 3 made of a highly conductive material and an upper plate 4 made of a mechanically strong material.

The pressure booster plunger 5 is mounted so as to be supported by the plate 4 via the base 5'. A spring-type device θ6 for returning the pressure booster plunger 5 to its original position is fixed to the pressure booster plunger 5. The cylindrical side of the pressure booster plunger 5 is the power cylinder 7
It is firmly fitted into the boring part.

The cavity W located above the pressure booster plunger 5 is filled with a liquid indicated by the number 8 supplied via the supply pipe 9 from a lift pump 10 which can be controlled by a level arm 11.

Similarly, the device of the invention prevents leakage of liquid from chamber 1.
The closure 12 includes a closure member 12 for a shoulder 14 thereof, in which a tubular workpiece 13 can be mounted, which also serves as a recoil and guide block. .

The closure member 12 has a high-pressure passage 15 which extends above the pressure booster plunger 5 and into a working chamber 16 defined by the side wall of the closure member 12 and the tubular workpiece 13, which contains a tubular recess 1T that can be filled with a liquid 8. Communicate with the empty space that resembles.

Since the diameter of the shoulder 14 of the closure member 12 is less than or equal to the diameter of the portion located below the closure member 12, the tubular workpiece 13
shoulder 14 in the gap formed by the side wall of 4 and the die 18 which tightly surrounds the tubular workpiece 13.
It can be pressed upwards reliably. The side wall of the die 1B is formed with an annular forming groove 19 disposed corresponding to the annular recess 17 of the closing member 12 and a groove for fixing a pressure sealing gasket.

The die 1B corresponding to the closing member 12 is a pressure cup 20
It is fixed to the upper part of the chamber 1 by a device such as. Furthermore, room 1
A discharge passage 21 is provided in the upper part of the chamber 1, which discharge passage 21 serves to communicate the lift pump 10 with the top of the chamber 1.

The supply pipe 9 of the sump supplying the liquid 8 has a backwash valve 22 whose purpose is to prevent swarming of the liquid 8 during the working cycle.

Next, Figure 2 shows chamber 1 of the hydraulic pulse forming device for a tubular workpiece.
, in which the lower plate 3 is of the disc type and made of a highly conductive material.

A collar 23 for supporting the upper plate 4 is provided on the inner wall of the chamber 1, and a gap 24' is provided between the upper plate 4 and the lower plate 3. The base 5' of the pressure booster plunger 50 is formed with a spherical cross section, and a recess 25 is formed in the upper plate 4 providing a projecting edge 26 for accommodating the base of the pressure booster plunger 5. Due to the spherical shape of the base 5' of the pressure booster plunger 5, the pressure booster plunger is supported only at a single point on the upper plate 4, and is supported by the interaction between the base 5' and the protruding edge 26 of the recess 25. Since the pressure-increasing plunger 5 and the upper plate 4 are pivotally connected, engagement and disengagement during operation can be prevented.

By providing a disk-type lower plate 3, the amount of metal consumed for the manufacture of the device can be reduced and the mechanical strength of the lower plate 3 can be increased.

An upper plate 4 secured by a collar 25 on the inner wall of the chamber 1
The gap 24 between the upper plate 3 and the lower plate 3 prevents the recoil impact of the upper plate 4 caused by the elastic deformation of the upper plate 4 from being transmitted against the lower plate 3 and the induction coil 2. I can do it.

By pivotally connecting the upper blade plate 4 and the spherical surface of the I section 5' of the pressure intensifier plunger, it is possible to compensate for any misalignment between the two members, and to maintain the pressure intensifier plunger 5 in its initial position. It can be returned to.

FIG. 3 shows the closure member 12 provided with a ring 27 of elastic material accommodated by a groove 28. In FIG. Since the outside of the ring 2T is curved when viewed in cross section, the tubular workpiece 13
If the diameter of the work chamber (Fig. 1) deviates from the rated diameter,
This ensures pressurized sealing and prevents damage to the inner surface of the tubular workpiece 13.

The device of the invention operates as follows.

After the tubular workpiece 13 has been mounted on the shoulder 14 of the closure member 12, the die 18 and the pressure cup 20 tighten the tubular workpiece. For example, a liquid 8 such as water is pumped into the lifting pump 1 by a level arm 11 via a check valve 22.
0 via the supply pipe 9 and further towards the cavity located above the plunger 5, the high-pressure channel 15 and the working chamber 16.

The electromagnetic pulse force is transmitted from the induction coil 2 by the lower and upper plates 3 and 4 to the plunger 5 which travels in the power cylinder 7 and produces a high pressure pulse in the passage 15 and working chamber 16, so that the tubular workpiece The object 13 will be deformed within the die 18 and will take the shape of an annular mold-forming groove 19 .

If the tubular workpiece 13 is insufficiently formed, after supplying an additional amount of water to the working chamber 16, a shaping or correction operation is carried out and the tubular workpiece 13 is removed from the closure member 12. liquid 8
After flowing from the working chamber 16 into the space between the die 18 and the closing member 12, the power cylinder 7 and the pressurizing cup 20
reaches the upper part of chamber 1 through the gap formed between
It is transferred from the waiting room by the arm 11 and reaches the lift pump 10 along the discharge passage 21. A steel spring 6 returns the plunger 5 to its initial position of 11°. Since the plunger 5 and the power cylinder 7 have surfaces that fit snugly together, reliable airtight cooperation is possible. However, the tightness of the cooperating surfaces is limited to cases where the device is silent. During actuation of the high-pressure pulse, liquid flow between the plunger 5 and the power cylinder T is prevented, so high airtightness is not required. Therefore, there is no particular need to seal the retaining surfaces of the tubular workpiece and the closing member.

According to the invention, the energy consumption of the liquid 8 is reduced,
By using mechanical pressure increase, it is possible to increase the efficiency of the hydraulic pulse forming device for tubular workpieces. Additionally, the amount of metal required to manufacture the device is reduced since no special explosion chamber, pressure boost stage or protective shielding devices are used. Another advantage of the device according to the invention is that one power parameter is more stable, in particular because of the magnetic pulse generator and the highly precise electrical characteristics of the variable induction coil 2. Finally, the concentric arrangement of the high pressure passages 15 increases the reliability of the device and allows the deformation of tubes of fairly small diameter.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a hydraulic pulse forming device for a tubular workpiece according to the invention. FIG. 2 is an alternative cross-sectional view of the device according to the invention showing the chamber with the device for creating and transmitting liquid pressure. FIG. 3 is a diagram mf showing another type of closure member with an elastic ring on the upper part. 1... Chamber 2... Multi-turn induction coil 3... Lower plate 4... Upper plate 5... Pressure booster plunger 5'. ... Pressure booster plunger base 6 ... Pressure booster plunger return device 7 ...
- Power cylinder 8...Liquid 9...Liquid supply pipe 10...Pushing pump 11...Level arm 12...Closing member 13...Tubular workpiece 14... - Peripheral part 15 of the closing member... High pressure passage 16... Work room IT... Annular recess 18... Die 19... Annular forming groove 20... Pressure cup 21... Discharge passage 22 ... Check valve 23 ... Annular collar 24 provided on the wall of chamber 1 ... Plate 3
and 4 gaps 25... recesses provided in the upper plate 26... protruding edges 2T of the recesses 25... elastic rings 28... annular groove A.N.C. Toubo Revua 7 201 Continuation of page 1 0 shots Author: Pawel Ivanovich Kuvshinov, Kazan-Ulitsa Tolyscheskaya, 30-nee Kewi 106 0 Inventor: Nikolai Nikolaevich, Uvuatov-Soviet Federation, Kazan-Ulitsa-Dostoyevskaya, 74-nee Kewi 217 0 Inventor Yuri Aleksandrovich Komylinsouyet Federal Kazan-Ulitsa Krasnayapozytsia 11 Kewi 31 0 Inventor Vadim Eduardovich Abdullinsouyet Federal Kazan-Ulitsa Karbuisieua・15 Kewi 105

Claims (1)

[Scope of Claims] (1) A device for generating pulse pressure in a liquid and converting it, and a wall of a tubular workpiece (13) that can be attached to the closure member (12) and the closure member (12). ) The chamber (1) is provided with the closing member (12) provided with the high pressure passage (15) that communicates the interior of the chamber (1) with the chamber (16) defined by the side surface of the chamber (16); ) and a die (18) spaced apart from the closing member (12) to generate pulse pressure in the liquid and convert it. The device includes a multi-turn induction coil (2) for forming a pulse electromagnetic field in the direction of the work ff1 (16), and the induction coil (2)
), a lower plate made of high-conductivity material (3), a lower plate made of mechanically strong material (4), and a pressure booster plunger (5) are arranged in order. , the high-pressure passage (15) has a working chamber (16) disposed within the closure member (12) having a coaxial organ and a cavity located above the pressure booster plunger (5). A hydraulic pulse forming device for a tubular workpiece, characterized in that it communicates with the workpiece. (2) said pressure booster blanker (5) facing said upper plate (4);
Device according to claim 1, characterized in that the base (5') of the upper plate contacts and pivotably interconnects the upper plate at one point. 3. Device according to claim 2, characterized in that the base (5') of the pressure-increasing plunger (5) has a spherical cross section. (4) the plates (3 and 4) are arranged with a gap (24) between them, the lower plate (3) being formed as an annular disc member and the wall of the chamber (1) being arranged with a gap (24) between them; Device according to claim 1, characterized in that it has an annular collar (23) for supporting the plate (4). (5) The upper part of the closing member (12) on which the tubular workpiece (13) is placed is provided with at least one annular e (2B) having an elastic ring (27) fixed therein. The device according to any one of the patents for 2010 to 4th paragraph. {6) Device according to claim 5, characterized in that the cross section of the elastic ring (2T) has a curved outer surface. (7) The device according to any one of claims 1 to 6, characterized in that the liquid supply pipe (9) is provided with a reverse IE valve (22).