Device for welding of circular seams

FIELD: process engineering.

SUBSTANCE: invention relates to welding and can be used for securing of hemispherical structure parts at welding of circular seams. This device comprises reduction gearbox with inclined rotational axis and built-in current feed device with sliding contact and positioning device of hemispherical structure of aluminium alloy arranged to spin at reduction gearbox driven shaft. Reduction gearbox conical gears are engaged via mid teeth pitch diameter with axial squeezing without radial and lateral clearances by means of springs fitted coaxially with rotary pins coaxially with conical gears. Said current feed device with sliding contact is insulated by appropriate sleeves fitted in conical gear hubs, reduction gearbox housing and at drive axle.

EFFECT: higher quality of the weld, decreased residual strain internal stress of welded parts.

3 cl, 1 dwg

 

Apparatus for welding circumferential seams

The invention relates to the field of welding production, namely to devices for automatic welding consumable and consumable electrodes circumferential welds hemispherical design, and can be used in aviation and engineering industry.

A method of worki circular element in the shell structure in which the edges of the hole shell structures applied elastic tensile load, is inserted into the hole of the circular element and perform the welding of the backing ring (and.with. The USSR №774867. Method of worki circular element in the shell design, IPC B23K 28/00).

The disadvantage of this method is that the automatic welding of circular seam hemispherical design of material 30KHGSA with the formation in the weld zone tensile load causes plastic deformation in the process of melting the edges and crystallization of the weld pool ring weld backing ring, created residual structural stresses that form in the weld defects such as pores and cracks, which reduces the productivity of the manufacturing parts of the hemispherical structure.

A method is known, which in the course of one-sided welding of reactive metals with cutting edge non-consumable electrode for receiving�ia good penetration in the weld root should be protected from air to back side of the molten and heated metal. This is achieved by using copper or steel backings with longitudinal grooves of a rectangular shape, which is supplied with a protective inert gas (Akulov, A. I., Technology and equipment for fusion welding - M.: Mashinostroenie, 1977, p. 53, Fig. 45A).

The disadvantage of this method is that when welding there is a need of filing a protective inert gas that creates the work of performing automatic welding of longitudinal seams.

A device for welding of circumferential joints, consisting of a weld head having a small vertical and horizontal freedom of movement and mounted on a rotatable arm (and.with. The USSR №517421. Apparatus for welding circumferential seams, IPC: B23K 9/32, B23K 31/06).

The disadvantage of this device is the design complexity of the clamping disc, which has two conical surfaces and is provided with a dispensing containers in the form of blind holes disposed circumferentially inclined relative to the Central axis of the clamping disk, on top of which there is a pressure plate at the connection of the clamping disk and the pressure plate there is a groove for preventing the wetting of the cooling liquid weld zone, which is unacceptable when welding material 30KHGSA.

The closest analogue of the proposed device, taken as a prototype, is a m�is a device for positioning of a workpiece during welding of circumferential welds, containing the gearbox with bevel gears and a driven axis of rotation located at a fixed angle of inclination relative to the drive axle of rotation built into the power reducer device with the sliding contact, positioner, mounted rotatably on a driven axis of the reducer in the form of a hemispherical design of aluminum alloy (Evstifeev, A., I. S. Veretennikov. Means of mechanization of welding production. - M.: Mashinostroenie, 1977, p. 20, 25, Fig. 5B, 7).

The disadvantage of the prototype is that the design of built-feed device with a sliding contact, consisting of sectors with the necessary set of copper-graphite brushes, ensures the reliability of current collection regardless of the direction of rotation of the positioner is mounted rotatably on a driven axis of the reducer in the form of a hemispherical design of aluminum alloy.

In mass production of welded shell parts with increasing thermal cycle during welding in the housing of the positioner create a higher heat capacity, which is between the positioner is mounted rotatably, and a built-in current-carrying device with the sliding contact, consisting of sectors with the necessary set of copper-graphite brushes, when the passer�completion of the welding current in the welding zone is provided by an electric resistance occurs and the uneven rotation speed of sliding contacts. When welding parts consumable electrode creates a need to adjust the weld mode.

The object of the invention is to improve the quality of welding of circular seam by stabilizing the speed of rotation, providing the possibility of rotation on the slave positioner axis speed reducer and increase the reliability of the feed device with the sliding contact in automatic welding of circular seam regardless of the direction of rotation.

The problem is solved due to the fact that the device for positioning of a workpiece during welding of girth welds containing reducer with bevel gears and a driven axis of rotation located at a fixed angle of inclination relative to the drive axle of rotation built into the power reducer device with the sliding contact, positioner, mounted rotatably on a driven axis of the reducer in the form of a hemispherical design of aluminium alloy, coil springs mounted on the axes of rotation of bevel gear coaxially with the possibility of axial biasing of bevel gears and ensuring their engagement in the middle of the pitch diameter of the teeth without radial and lateral clearances, provided with insulating sleeves pressed into the hubs of bevel gears in gear housing and vedo�the first axis of rotation with the possibility of providing electrical isolation built-in current-carrying device with a sliding contact, moreover, the current-carrying device with the sliding contact is made in the form is pressed into the gear housing, bronze sleeve bearings and sliding on her brass bushing, is made with a conical surface with an angle of 120° with the possibility of centering relative to bronze sleeve bearings due to the axial biasing spring mounted on a driven axis of rotation.

In addition, the positioner is set a copper backing ring. The claimed invention is illustrated by Fig. 1, which shows a section of the device for the welding of circumferential seams. The cut shown:

1. gear housing;

2. insulating bushing;

3. insulating bushing;

4. bronze bushing;

5. bronze bushing with metric thread;

6. screw;

7. the ball;

8. bronze bushing;

9. leading the rotation axis;

10. shutting spring;

11. bevel gear;

12. insulating bushing;

13. steel pin;

14. driven axis of rotation;

15. brass bushing;

16. screw;

17. insulating bushing;

18. the gland spring;

19. bevel gear;

20. insulating bushing;

21. steel pin;

22. positioner hemispherical structure of aluminum alloy;

23. copper pin;

24. copper backing ring;

25. screw with metric thread;

26. nut;

27. spring;

28. detail;

29. circular element;

30. Tekapo�waters.

Apparatus for welding circumferential joints comprises a housing 1 gearbox with bevel gear 11 on the drive axle of rotation 9 and bevel gear 19 on a driven axis of rotation 14, which is located at a fixed angle of inclination relative to the drive axle 9. In insulating bushings 2 and 3, is pressed into the housing 1 of the gear pressed bronze bushing 4 and 5, the sleeve 5 has a metric thread screw 6 containing a hemispherical recess under the bulb 7, coaxially to the sleeve 4 is installed shutting spring 10 on the drive axle 9. The springs 10 and 18 are mounted on axes of rotation 9 and 14 of bevel gears 11 and 19 of the gear coaxial with the possibility of axial biasing of bevel gears. Bronze bushing 8, is pressed into the housing 1 of the gear and moving it brass bushing 15, is made with a conical surface with an angle of 120° with the possibility of centering relative to bronze sleeve bearings due to the axial biasing spring 18, mounted on a driven axis of rotation 14 and fixed by screw 16 from turning. The insulating sleeve 12 is pressed into the hub of the bevel gear 11 and a fixed steel pin 13 on the driving axis of rotation 9 and the insulating sleeve 20 is pressed into the hub of the bevel gear 19 and fixed by steel pin 21. The insulating sleeve 17 is mounted positioner 22 hemispherical design of aluminum�avago alloy rotatably on a driven axis 14 of the gear and fixed brass pin 23, for the formation of a fusion with copper backing ring 24. The positioner 22 is hemispherical design of aluminum alloy relative to the slave axis 14 of rotation of the set screw 25 with metric thread, the nut 26 with a spring 27 for fixing parts 28 and circular element 29. Current lead 30 is fixed to the body 1 of the gearbox. The device operates as follows.

In the initial position on the positioner 22 is mounted rotatably on a driven axis of rotation 14 of the gearbox and made in the form of a hemispherical aluminum alloy construction with screw 25 with metric thread, lay the workpiece 28 and the circular element 29, which by means of a spring 27 is fixed by a nut 26, providing the joint edges along the axis of the groove copper backing ring 24 to form fusion in automatic welding of circumferential weld consumable electrode.

When switching on the drive of the welding machine leading the rotation axis 9 through a bevel gear 11, filleting with a bevel gear 19 mounted on a driven axis of rotation 14 with emphasis on the bulb 7 and located at a fixed angle of inclination relative to the leading axis 9 of rotation, provide a uniform speed of rotation of the positioner 22 to a driven axle of the gearbox.

The springs 10 and 18, mounted on the axes of rotation 9 and 14 relative to bevel gears 11 and 19 reduct�RA coaxially with the possibility of axial biasing of bevel gears during rotation, secure their gear in the middle of the pitch diameter of the teeth without radial and lateral clearances and form a uniform angular velocity of rotation of the axes.

Current lead 30 connected to the housing 1 gearbox, allows the passage of the welding current in the welding zone through built-in current-carrying device with the sliding contact, in the form of pressed into the gear housing, bronze sleeve bearings 8 and moving on her brass bushing 15, the housing of the positioner 22 hemispherical design of aluminum alloy, mounted on an insulating bushing 17 fixed brass pin 23.

Brass bushing 15, is made with a conical surface with an angle of 120° with the possibility of centering relative to bronze sleeve 8 by the axial biasing of the spring 18, mounted on a driven axis of rotation 14, and is fixed by a screw 16 from turning, and enables a uniform speed of rotation of the positioner 22.

The insulating sleeve 12 and 20, are pressed in the hubs of bevel gears 11 and 19, fixed by steel pins 13 and 21, and insulating bushings 2 and 3, is pressed into the gearbox housing 1, into which are pressed bronze bushing 4 and 5, the sleeve 5 has a metric thread of the screw 6 and the insulating bushing 17 fixed on a driven axis of rotation 14, provide� electrical isolation built-in current-carrying device with the passage of the welding current in the welding zone, excluding thermal expansion of the rotating elements from the heat from the welding zone.

The spring 27 with a nut 26 in the welding process contribute to thermal expansion of parts in the spin cycle eliminate internal stress during the formation of the fusion ring of the seam.

The positioner case 22 of the hemispherical structure of aluminum alloy with installed copper backing ring 24 in operation during isothermal heat conduction from the welding temperature field edges with a limiting condition relative to the backing ring to form the boundary conditions of heat exchange with a heat transfer coefficient between the inner surface of the housing and the air provides convective heat transfer from thermal conductivity is inversely proportional to the temperature gradient of the edges, which increases the efficiency of thermal cycles automatic welding of circumferential seams of the nonconsumable electrode.

Device for positioning of a workpiece during welding of girth welds can be used for welding of elements of shell structures made of materials 30KHGSA and 12X18H10T using DC straight and reverse polarity, as well as for welding aluminum alloys with alternating current as consumable and consumable electrodes.

1. Device for positioning of a workpiece at SVA�ke circumferential welds, containing the gearbox with bevel gears and a driven axis of rotation located at a fixed angle of inclination relative to the drive axle of rotation built into the power reducer device with the sliding contact, positioner, mounted rotatably on a driven axis of the reducer in the form of a hemispherical design of aluminum alloy, characterized in that it is provided with springs mounted on the axes of rotation of bevel gear coaxially with the possibility of axial biasing of bevel gears and ensure their gear in the middle of the pitch diameter of the teeth without radial and lateral clearances, and insulating sleeves pressed into the hubs of bevel gears, in gear housing and a driven axis of rotation with the possibility of providing electrical isolation built-in current-carrying device with the sliding contact.

2. The device according to claim 1, characterized in that the feed device with the sliding contact is made in the form is pressed into the gear housing, bronze sleeve bearings and sliding on her brass bushing, is made with a conical surface with an angle of 120° with the possibility of centering relative to bronze sleeve bearings due to the axial biasing spring mounted on a driven axis of rotation.

3. Device�according to claim istwo 1, characterized in that it is provided mounted in the positioner copper backing ring.



 

Same patents:

FIELD: machine building.

SUBSTANCE: invention relates to the device for electrode replacement in welding device electrode holder. The device has container for spent electrodes with hole, on which an assembly is installed containing throughput channel (7) with longitudinal axis (X), the channel connects with the container the socket (46) holding the electrode holder end ensuring the mandrel. This axis (X) is approximately vertical. Device also contains equipment (46) for the electrode holder mandrel tightening or loosing, equipment (54) for electrode securing in the specified device, and equipment (28) for the spent electrode discharge in the container enabling or disabling.

EFFECT: device simplifies new electrode installation instead of the spent electrode, and reduces time for electrode replacement.

25 cl, 18 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to electrode replacement device in welding system. This device comprises first part (12) to house the electrode holder (2). Said first part (12) comprises tool electrode holder retainer Second part (14) is arranged around said first part (12) to cover electrode part (8) extending from said first part (12). Second part (14) can be detached from first part (12) at sliding along electrode and revolve relative to fixed part (14) at surrounding it. Second part (14) comprises clamping or releasing means of mandrel (6), and electrode and second part retainer (36) to withdraw it from mandrel (6) when first part (12) and second part (14) are separated.

EFFECT: perfected design.

21 cl, 6 dwg

FIELD: process engineering.

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EFFECT: higher welding rate, increased penetration and higher mechanical properties and quality.

18 cl, 6 dwg

FIELD: process engineering.

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EFFECT: reliable locking of carcass in welding device.

8 cl, 9 dwg

FIELD: process engineering.

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EFFECT: longer life, higher quality of welding.

7 cl, 4 dwg

FIELD: process engineering.

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EFFECT: perfected design.

26 cl, 12 dwg

FIELD: process engineering.

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EFFECT: control device 4 corrects residuary welding time proceeding from actual welding current magnitudes.

13 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to device 27 for protection of welding set housing element 26. Proposed device 27 is composed of plate 28. Outer side 29 of plate 28 has ledges 30. Note here that plate 28 is secured to housing 26 so that said outer side 29 interacts with the surface over which housing 26 displaces in changing of its position.

EFFECT: optimised protection.

9 cl, 8 dwg

FIELD: process engineering.

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EFFECT: higher efficiency.

16 cl, 9 dwg

FIELD: process engineering.

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EFFECT: better attachment.

8 cl, 10 dwg

FIELD: process engineering.

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EFFECT: higher quality and efficiency.

4 cl, 1 dwg

FIELD: process engineering.

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3 cl, 3 dwg

FIELD: metallurgy.

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EFFECT: shaping of back of weld in protective gas medium that increases quality of weld seam.

4 cl, 3 dwg

FIELD: welding processes, namely attachments for forming back side of welded seams, mainly at welding sheets parts of aluminum alloys.

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EFFECT: improved quality of welded seam.

8 cl, 3 dwg

FIELD: metallurgy.

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EFFECT: improved device characteristics.

2 dwg

FIELD: process engineering.

SUBSTANCE: butt welding machine can be used for jointing the butts if strips (11, 12) by contact welding at appropriate plant. Two symmetric pairs of clamping jaws (22, 32, 31, 21) of the device for welding of one end of one strip (11) with second end of the other strip (12) are designed to retain and to position said ends of strips (11, 12) for connection by contact welding. Each of said jaws (22, 32, 31, 21) includes part (222, 212, 312, 322) to contact with one of said ends of strips (11). Every said jaw features the geometry and at least material which allow the decrease in eddy currents generated in said jaws due to electromagnetic induction at thermal processing of the weld. Said part of said jaw makes the kedge extending in direction of the strip end so that the gap between strip and induction head equals the depth of said ledge with due allowance for the gap there between.

EFFECT: continuous and compact weld, uniform cross-section, high quality of weld of thin strips.

15 cl, 6 dwg

FIELD: machine building.

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EFFECT: weld joint provides for better strength of the connection and resistance to dynamic loads.

22 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: end surface of fragments to be coupled are levelled and cleaned. Bores are drilled therein and thread is cut. Said fragments are degreased by gasoline. Then, fragments are assembled to flat structure with the help of studs made of stainless steel. Then, edges are finished for welding, fragments are degreased and subjected to arc welding with application of bronze wire in lines of joint of said fragments. Now, welds are finished and surface of made structure is subjected to sand blasting.

EFFECT: higher strength and reliability of welds.

1 ex, 1 dwg

FIELD: transport.

SUBSTANCE: separate section of reducing roller shoe consists of the frame, two drive roller shoes articulated with reduction gear and motor and two idle free running roller shoes. One or several section of driven roller shoes consist of the frame, two driven roller shoes engaged by couplings with pairs of idle roller bearings an pair of idle roller bearings. Section of driven roller shoes are mounted with frame abutting on the section of driven reducing roller shoe to make an integrated section with aligned continuous drive rolling support and aligned continuous rolling support. Roller shoes in pairs are mounted at different heights, those nearby the bench lengthwise axis are arranged below far ones with allowance for touch of standard shells with four roller shoes at a time. The number of driven roller shoes is selected proceeding from the possibility for bench to support calibrated shells, to set them as required and to assemble in circular butt. Sections of mobile roller shoe are arranged at track to displace there along in mirror axis of roller bench.

EFFECT: possibility to assemble cylindrical housing of various length.

4 dwg

Coordinate device // 2535434

FIELD: process engineering.

SUBSTANCE: invention relates to coordinate device and can be used in high-precision processing hardware, primarily, for processing of articles by laser tools. Bed 1 supporting coordinate axes 2, 3 has the cavity that makes a spark-quench chamber 9 with openings 8. Working zone is communicated via openings 8 and spark-quench chamber 9 with gas-dust bend pipeline 7. Spark-quench chamber 9 openings 8 are communicated with working zone 6 by throttling device. At laser processing, air from working chamber and combustion products flows via throttling device in spark-quench chamber 9. Note here that flow rate drops to make combustion product particles settle in said chamber. Combustion products are discharged from spark-quench chamber via hatch. Plugs are used to adjust air intake from chamber part accommodating head with laser tool to allow air flow rate control for efficient removal of combustion products.

EFFECT: efficient removal of combustion products.

4 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: set of invention can be used for bonding the ends of metal strips together by point friction welding, for example, at the inlet of aluminium strip machining unit. In compliance with this invention, both edges of the strips are positioned one on the other to overlap. First, end of first strip (1) is locked by clamp (15) at outlet side. Start of second strip (2) is positioned across direction of motion relative to first strip end, for example, centred thereat and locked by clamp (14) at inlet side. Or, on the contrary, first, start of second strip (2) is locked to position first strip (1) end across direction of motion relative to second strip start to lock it thereat. Both are friction welded together at overlap zone by welding head (5) at several weld points. Proposed device comprises at least one clamp (15) at outlet side for locking the first metal strip (1) end and clamp (14) at outlet side to lock the second strip (2) end start. Said clamps (14) and (15) can displace across the direction of strips motion.

EFFECT: bonding of various metal alloys without burring.

18 cl, 7 dwg

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