Bellows shaping apparatus

FIELD: plastic working of metal.

SUBSTANCE: apparatus includes mandrel, lower die, system for supplying pressure transfer fluid and system for air discharge. Die is made of two die halves mounted on mandrel. Outer die half includes two mutually coupled segments having on their inner cylindrical surface annular grooves in the form of bellows corrugations. Inner die half includes four segments having on outer cylindrical surface annular grooves in the form of bellows corrugations. Depth of annular grooves of outer and inner die halves is equal to half of height of corrugations of bellows. System for supplying pressure transfer fluid and system for discharging air are in the form of ducts for supplying high-pressure gas and for air discharge. Said ducts are arranged inside die halves.

EFFECT: enlarged manufacturing possibilities of apparatus due to enlarged assortment of high-quality bellows.

2 dwg

 

The invention relates to the field of metal forming and can be used in aviation and other industries in the manufacture of large-size bellows.

A device for the distribution of hollow workpieces This device consists of a matrix, cone diaphragms, the upper and lower bases and supply system of high pressure gas. This device is protected by the copyright certificate №1269893, B 21 D 41/02, USSR, IMS, No. 5, 1987, page 13, the workpiece mounted on the cone located inside the matrix and after heating is deformed by the gas pressure. Such a device does not allow you to get the details of a complex configuration and a large diameter.

The closest in technical essence and the achieved result is a device for the formation of corrugations on thin-walled tubular products (SU 158557, 12.11.1963, B 21 D 15/10)containing the mandrel, the matrix, the system of the fluid that transmits pressure, and the exhaust system.

Such a device has limited technological capabilities. So in the manufacture of bellows with a large height of the corrugation (width/height >4) from maloplastichnyj, difficult-to-deform materials difficult to obtain part of the required quality. If you wish to produce bellows with a diameter of >1000 mm, it is difficult to provide a uniform clamping of the bellows on the end, which is also the Vedas is t to the decline in the quality of manufactured parts. Besides, the presence of clamp complicates the design of the stamp and requires additional process equipment. The lack of heating during the formation of the bellows results in the need to create a lot of pressure transmitting medium.

The present invention solves the problem of expanding the technological capabilities by expanding the range of manufactured bellows and improve their quality.

The technical result is achieved in that the device for manufacturing bellows containing the mandrel, the matrix, the system of the fluid that transmits pressure, and the exhaust system, the matrix is made of two installed on the mandrel bolometric: outdoor, consisting of two fixed between the segments on the inner cylindrical surface of which is made annular groove in the shape of the corrugation of the bellows, and internal, consisting of four segments, the outer cylindrical surface of which is made annular groove in the shape of the corrugation of the bellows, while the depth of the annular grooves of the inner and outer volumetric equal to half the height of the corrugation of the bellows and supply system environment, transmitting the pressure, and the exhaust system is made in the form of a system of channels for the supply of high pressure gas and exhaust air inside the above volumetric.

To clarify the essence and the attainment figure 1 presents a view of the process plant from the top, 1 - frame; 2, 3, 4, 5 segments of the inner polimetrica; 6, 7 - segment external polimetrica; 8 - channel supply of high pressure gas; 9 - channel exhaust air.

Figure 2 shows a section of the installation along the line a-a, where 10 is the annular grooves of the inner polimetrica; 11 - ring groove; 12 - ring grooves of the outer polimetrica; 13 - ring the tooth.

The device operates as follows: on the mandrel 1 set the segments 2, 3, 4, 5 internal polimetrica. On top of the inner volumetric lower cylindrical workpiece closely adjacent to the outer surface of the segments 2, 3, 4, 5. Then the workpiece is clamped segments 6, 7 external polimetrica, after which the flanges of the segments 6, 7 are fastened to each other. Due to this and due to the introduction of the ring of teeth 13 in the annular grooves 11 is the workpiece and the sealing cavity of the matrix. The installation is placed in a furnace and heated to a temperature at which the material exhibits high plastic properties. For example, the material OT-1, the heating temperature of the workpiece 700°C. heating Method is selected based on the technological possibilities of production (for example, heating in a furnace, induction heating). After heating through the channels 8 to the workpiece serves inert gas to the required pressure. Under the gas pressure of the heated metal begins to deform, when is ima form annular grooves 10, 12. The deformation of the metal goes in two directions from the axis and to the axis of the bellows. In the process of distribution of the bellows, the air remaining in the annular grooves 10, 12, replaced by a deformable metal, and channel 9 is output to the outside. After forming the extraction of the bellows from volumetric as follows. The inner and outer pieces and uses together with the item is removed from the mandrel, removing the outer polimetrica, then remove the segments 2, 3, 4, 5 internal polimetrica.

In comparison with the known analogs of this invention allows the manufacture of a bellows of high quality with a large height of the corrugation (width/height >4) with a diameter of more than 1000 mm workmanship of the bellows is provided by reducing the degree of deformation of the metal by 50%, which reduces thinning of the metal at the points of maximum deformation (peaks and troughs of the corrugation) and reduce internal residual stress of the metal after deformation, it also allows to reduce the required pressure of the inert gas.

Device for the manufacture of bellows containing the mandrel, the matrix, the system of the fluid that transmits pressure, and the exhaust system, wherein the matrix is made of two installed on the mandrel bolometric: outdoor, consisting of two fixed between the segments on the inner cylindrical surface which is circular grooves are made in the shape of the corrugation of the bellows, and internal, consisting of four segments, the outer cylindrical surface of which is made annular groove in the shape of the corrugation of the bellows, while the depth of the annular grooves of the inner and outer volumetric equal to half the height of the corrugation of the bellows and the fluid that transmits pressure, and the exhaust system is made in the form of a system of channels for the supply of high pressure gas and exhaust air inside the above volumetric.



 

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5 dwg

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FIELD: plastic working of metal.

SUBSTANCE: apparatus includes mandrel, lower die, system for supplying pressure transfer fluid and system for air discharge. Die is made of two die halves mounted on mandrel. Outer die half includes two mutually coupled segments having on their inner cylindrical surface annular grooves in the form of bellows corrugations. Inner die half includes four segments having on outer cylindrical surface annular grooves in the form of bellows corrugations. Depth of annular grooves of outer and inner die halves is equal to half of height of corrugations of bellows. System for supplying pressure transfer fluid and system for discharging air are in the form of ducts for supplying high-pressure gas and for air discharge. Said ducts are arranged inside die halves.

EFFECT: enlarged manufacturing possibilities of apparatus due to enlarged assortment of high-quality bellows.

2 dwg

FIELD: plastic working of metals, possibly manufacture of radially corrugated bellows type tubes.

SUBSTANCE: apparatus for shaping bellows type tubes includes lower die detachable along its axis and punch. On inner surface of die there are dents and indentations corresponding to profile of bellows. Punch is mounted stationary and it has annular grooves on lateral surface for placing elastic shaping members. Punch also has radial ducts whose number is equal to number of shaping members and axial ducts. Apparatus is provided with distributing unit. Each radial duct is communicated with pressure source through its own axial duct and distributing unit.

EFFECT: enlarged manufacturing possibilities, enhanced efficiency, simplified design of apparatus.

3 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to the field of plastic metal working and may be used for manufacture of bellows from high-tensile steel grades. On billet that is installed on puncheon preliminary and final radial molding of crimp is carried out as well as axial yield in rigid split matrix with application of internal pressure. Method is carried out in the device that contains molding accessory in the form of split rigid matrix and elastic puncheon that take axial load, which is equal to load of subsequent axial yield, top and bottom spacers and bushing with internal annular bore. After installation of tubular billet onto elastic puncheon, split rigid matrix is joined, mentioned spacers are installed on it from top and bottom, on top of which bushing is installed. During preliminary molding axial force is created in spacers, which is equal to the force of axial yield, and dosed supply of liquid value is performed under elastic puncheon with creation of internal preliminary molding pressure without axial yield, after that spacers are removed, and axial yield is carried out simultaneously with final radial molding with application of axial yield force. For creation of axial force casing is provided, which is installed in the central axial channel of molding accessory bottom part, hydraulic cylinder with rod, which is installed inside casing with the possibility of axial movement in relation to casing and creation of cavity between external side of hydraulic cylinder and casing for control of dosed liquid volume, which is supplied into central axial channel, support that is installed on the rod of hydraulic cylinder, balancing piston, which is installed with the possibility of reciprocal motion in internal cavity of hydraulic cylinder, which is connected to central axial channel. Quality is increased and prime cost is reduced.

EFFECT: increase of quality and reduction of prime cost of process of bellows manufacture from high-tensile steel grades.

2 cl, 3 dwg

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