DE2827200C2 - System for gas case hardening of the cylindrical inner surface of a workpiece - Google Patents

Description

are prevented, the resulting support of the workpiece, especially if it is a long time Tubes, excessive bending of the workpiece during its heating and the occurrence permanent deformations.

With the system according to the invention, high quality pipes can be produced, which in turn have a Achieve increased service life if they z. B. for conveying abrasives in liquid or in gaseous form Media serve. Because of the higher and more uniform hardness of the inner pipe wall, the Amount and the speeds of the goods to be transported are increased, which also results in a decrease the operating costs for transporting abrasives

The invention is illustrated by the description of an exemplary embodiment with reference to the drawings further explained It shows

F i g. 1 irine system for gas case hardening of pipe

20 allows

The gas supply device 3 can be cooled in the example under consideration. A collecting space 22 is used for this purpose a coolant (cooling water) from a pipe 21 into the space surrounding the gas pipe 20 inside the gas supply device 3 is adjustable. The gas discharge device 5 is cooled in the same way

The system has a heating device 23 for heating the workpiece, which consists of an induction heating coil 24 and an induction thermostat 25 or just an inductor, it also has to be connected Cooling of the workpiece 4 is a cooling device 29 (ring spray nozzle), which by means of a pump 30 from a Container 31 cooling water is supplied. Both the heating device 23 and the cooling device 29 are attached to a platform 26 which by means of a (not shown) longitudinal movement drive on horizontal Guides 27 is movable to support the heated workpiece 4 and

To prevent workpieces from bending in their starting position in a schematic 20 are on the platform Side view: 26 support rollers 28 provided.

F i g. 2 the system after a machining cycle for the delivery of the workpiece in the transverse direction

corridor; serves a feed device 32, which as a runway or

3 shows the plan view of the system in the inclined frame position with a lever mechanism 33 measure F i g. 1; 25 is (Fig. 3). To further promote the treated

F i g. 4 schematically shows the vertical axial section of the workpiece, a receiving device 34 with an egg gas supply device is used with their rotary drive;

F i g. 5 schematically shows the feed gas supply into and the gas discharge from the cavity of a workpiece.

The system for gas case hardening of the cylindrical

The inner surface of a workpiece has two fixed brackets 1 and 2, on one of which is a gas supply device 3 for gas supply into the cavity of the workpiece 4 (indicated by dashed lines) is attached in a cantilevered manner, and

nem lever system 35. The activation and deactivation of the drives takes place by means of known electromechanical locks, limit switches or the like. The operation of the system is as follows: The workpiece 4, for example a pipe, is with With the help of the lever mechanism 33 from the feed device 32 coaxially to the gas supply and gas discharge device 3 and 5 are positioned.

at the other one a gas discharge device 5 for 35 nal 7 compressed air is introduced into the one working space of the cylinder gas discharge from the cavity of the workpiece 4 equal to the drive 6 and thereby the gas supply axially to the gas supply device 3 is overhung
(Fig. Ibis 3).

Both the gas supply and the gas discharge

device 5 advanced so that the workpiece (tube 4) is clamped at its opposite end faces. Because of the anstorichtung 3 and 5 on the workpiece A has a longitudinal movement drive 40 ßenden conical end faces of the gas supply and 6, z. B. a compressed air cylinder, the working spaces of which are gas discharge devices 3 and 5, the hollow with the compressed air duct space of the workpiece 4 running in the brackets 1 and 2 is sealed,
len 7 and 8 are connected (Fig. 4). The lever mechanism 33 is then reset, and

The drives 6 are structurally identical to one another; at the same time automatically starts the feed gas supply in serve to move the gas supply and 45 the cavity of the workpiece 4, namely but the gas discharge device 3 and 5 when inserting the pipe 17, the slide 19, the pipe 16, the. Collecting space of the workpiece 4 between this and the subsequent 15 and the gas line 20 of the gas supply device 3.
Clamping the workpiece 4 at its end faces After the cavity of the workpiece 4 with the

by approaching the devices. Feed gas is filled, the or the

A rotary drive 9 is switched on on at least one of the brackets 1 or 2, which drives the rotary drive Drive 9 mounted, the gas supply device 3 and the workpiece 4 and possibly. The non-rotationally driven or or the gas discharge device 5 and thus also the gas discharge device * 5 of the workpiece 4 result has set the workpiece 4 in rotation

Fig.4 shows the details of the rotationally driven Simultaneously cooling water is through the pipe 21 in

Gas supply device. The rotary drive 9 consists of 55 dei. Samsnelraum 22 of the gas supply device 3 and

a direct current motor 10, which by means of a gear transmission ^J - ^ - - ^uc ·· '' - ¹ - · ⁼ - ' ^J: - "-''

be 11 is kinematically connected to the gas supply device 3 via drivers 12 and stop flanges 13.

The gas supply device 3 runs through the compressed air cylinder piston 14 of the longitudinal movement device 60 29.

drive 6 and the rotary drive acts on it where it is then the heating device 23 and the longitudinal

emerges from this. motion drive of the platform 26 is automatically

The gas supply device 3 has a collective switch. When moving the platform 26 along the space 15, which is connected via a pipeline 16 and a sliding workpiece 4, one after the other from the inductor 19 heated by a feed gas pipeline 17 and a £ 5 tion coils 24 and 25 and then by Inert gas pipeline 18 is fed, and the one continuous spray nozzle 29 is cooled.

Renal supply of gas to the front end of the turn- If the platform is as shown in FIG. 2 position shown

existing gas supply device has reached 3 leading gas line, its motion drive is automatically switched off.

the gas discharge device 5 is pumped and the devices are thus cooled from the pump 30 cooling water for cooling the induction coils 24 and 25 and for feeding the spray nozzle

switched, as well as the induction coils 24 and 25 and the rotary drive 9. Then the slide 19 the gas supply is switched to an inert gas from the pipe 18 for blowing through the cavity of the workpiece 4.

After the cavity of the workpiece 4 has been blown through, the lever mechanism 35 is switched on automatically and the supply of compressed air to the channel 8 of the longitudinal movement drive 6 of the gas supply device 3 and the gas discharge device 5 switched so that they move apart, release the workpiece 4, and this arrives at the receiving device 34. When the workpiece 4 is on the receiving device 34 is located, the lever mechanism 35 is reset.

Now the longitudinal movement drive of the platform 26 is reversed and this in the starting position according to 3, the drive, the pump 30 and the coolant supply are at the end of the path into devices 3 and 5 automatically. The machining cycle ends, and the plane is ready for machining the next workpiece.

For this purpose 2 sheets of drawings

25th

30th

35

40

45

so

55

Claims (3)

1 2 it is known from the SU inventor's certificate 2 83 269 Bsi patent claims: this known system is used close to the work | Gas supply and discharge pre- 1. System for gas case hardening of the cylindrical directions at the same time as power supply contacts, Inner surface of a workpiece, in particular of a 5 via which the workpiece is heated electrically Pipe, which can be fed in with electricity, is primarily intended to be a Evacuation of the workpiece interior, but also - the introduction of a protective gas on a cantilever stanchion attached to one side. zen, with this system is supposed to sine bare inner surface of the - A device for supplying gas in the hollow workpieces can be achieved by annealing. A use ϊ, space of the workpiece, dung for gas case hardening is less of a question, j - A device for removing gas from the electrical cavity because it is heated by passing it through of the workpiece and see current an even heating of the workpiece - Horizontal drives of the gas supply and discharge = - the wall of the piece is not ensured and a gas device as a result of their hardening in various areas ken on the workpiece front sides, the workpiece inner surface unevenly over time would expire. Also were working shifts characterized by having different thicknesses, which is also the Would call into question the quality of the workmanship. - A rotary drive (9) for rotating the work- 20 From US-PS 40 32 369 a system for Absiüeks {4} dm its longitudinal axis together with horror of pipe workpieces is known in which dss the gas supply and discharge devices (3 pipe between two horizontally drivable supply ^and d5), and discharge devices for a quenching liquid - a can be clamped to the gas line of the Gaszufuhrvorrich- and together with these Betoeng (3) in connection stationary plenum 25 is movably This movement, however, is a Schwenkbe- (15) and for the lowering movement of the workpiece in a FIüs- - a heating and a cooling device (23 and 29) liquid tank for quenching also its outer surface, on one with a horizontal drive. Gas case hardening is neither intended nor provided here n and on horizontal guides (27) possible; there is no way to do this provided platform (26). 30 the heating of the pipe workpieces so that they are hot need to be delivered. 2. System according to claim I ₁ characterized by DE-OS 21 32 784 finally a system is a coolant-infiltrated cavity of the gas supply device for hardening and tempering of pipe workpieces (3), in which one with the collecting knows, in which one uniform heating and cooling space (15) connected «. Gas line (20) 35 development is achieved in that the workpieces run under simultaneous rotation by an inductor as a heating 3. Plant according to claim 1, characterized by a device and a spray nozzle arrangement as cooling support rollers (28) on the platform (26). device are moved. A simultaneous seal of the pipe interior and a possibility to 40 gas introduction into this is not provided, see above that gas case hardening is not possible here either. The object of the present invention is to The present invention relates to an avoidance of the stated difficulties in a plant ge for gas case hardening the cylindrical inner surface for gas case hardening the cylindrical inner surface a Workpiece, in particular a pipe, 45 creating a workpiece that allows the Bearz. B. is thought of pipes that improve the quality of the work piece for conveying the inner surface of the workpiece, abrasive pulps or for compressed air transport. The gas supply should be in the sealed hollow earth serve of bulk solids. space of the workpiece be possible in a simple manner. From the SU Inventor's Certificate 4 92 569 is an attachment based on the generically presupposed known for hardening the inner surface of pipes, at 50 known system this task is carried out by the im a gas burner as a heating device and a characterizing part of claim 1 mentioned ne spray nozzle as a cooling device inside a feature solved by the invention Pipe are longitudinally movable relative to this. The training at the same time possible gas supply in the Machining cavity of the rotating workpiece and the vertical head containing the gas burner and the spray nozzle sits on a shaft protruding into the tube, in 55 move the heating device and the cooling front Supply pipes for a gas-air mixture to the direction along the workpiece is a uniform feed of the burner and for water to feed the right working layer and thus a higher processing spray nozzle get lost. good of the inner surface of the workpiece as well as a self- The known system cannot, however, be used to supply gas into the cavity of the rotating Hardening of the cylindrical inner surface of a Werk- eo workpiece achieved Pieces are used because a seal is relatively simple in terms of construction. End faces of the workpiece cavity not provided. An expedient development of the invention is shown in FIG It would also be impossible to specify a feed gas together with claim 2, wherein the proposed here with the burner and the spray nozzle in the pipe interior cooling of the gas supply device to have the service life. _{65 of} the plant increased The invention is based on a system for heating if according to the proposed in claim 3 treatment of hollow workpieces, in particular raw development of the invention on the length of the work, according to the preamble of claim 1, as a piece of movable platform support rollers are provided