SU1242321A1 - Friction-welding machine - Google Patents

Description

The invention relates to friction welding, namely to the hydraulic drive of friction welding machines.

The purpose of the invention is to increase the efficiency of the welding machine by completely unloading the high-pressure pump, as well as by reducing the size of the reverse slide valve.

The drawing shows a hydraulic drive circuit for axial compression of a friction welding head.

The axial compression drive hydraulic circuit contains hydroschemes 1, high pressure pump 2, pressure

2S

thirty

which, using an overflow gold-5 vaimze, the blanks came together, but their nickname 3 is set to the highest compression level - forging, drain tank 4, three-position four-way electrohydraulic spool 5 of the reverse, pump 6 of high capacity, 20 whose pressure by overflow spool 7 is tuned to the second step squeeze. A three-position four-way electro-hydraulic spool 8 switching pumps 2 and 6 is connected by one input to the pressure line 9 of the high-pressure pump 2, and the other through the line 10, the spool 5 and the line 11 to the pump 6 of higher capacity.

By its one output, the spool 8 is connected to the drain main 12, and the second - the main line 13 with the spool 14 switching pressure stages and the main 15 with working lobes of the cylinders 1. The pressure level switch includes spool valves 5, 8 and 14. 16 and 17. The non-force cavities of the cylinders 1 by line 18 are connected to the return line 12 via the spool of 5 revolutes.

Machine for friction welding works as follows.

In the disconnected state of the electromagnets of spools 5 and 8, the oil from the pump 2 through the spool 8 and from the pumps 6 through the spool 5 enters the drain line 12. In this case, both pumps are unloaded. 50

After the auxiliary operations, the workpieces to be welded are approached by the hydraulic cylinders 1 at a predetermined marching speed. To do this, the left electromagnets of the earthquakes 5 and 8 are included, the oil from the high pressure pump 2 through the spool 8 continues to flow to the drain, the touch has not yet occurred, the left electromagnet of the gold 8 is turned on and the right electromagnets of the spools 8 and 14 turn on. In this case, the high-capacity pump line 11 of the high-capacity pump 6 through the spool 5 of the reverse, the pump switching spool and drainage of the cTpajib 12 communicates with the tank 4, and the high-pressure pipe 9 of the high pump 2 through the valve 8 and the main 15 yn is a power papost 1mi cylinder 1, and also through the spool 14 to the spool 16, the mood enny pressure first-stage compression channel minute. Since the capacity of the high pressure pump 2 is much lower than the performance of the pump 6, then at the indicated switchings, the speed of the cylinders and the workpiece is sharply reduced and the workpieces of the overflow valve 16 will smoothly come into contact under pressure. Oil displaced from the left non-force cavities cylinders through line 18, spool 5 and line 12 drain enters the tank. In this case, the first heating stage will be carried out.

At the end of the first stage of the heating, the left electromagnet of the spool 5 remains on, the right electromagnets of spools 8 and 14 turn off and the left electromagnet of the spool 8 is turned on again, the oil from the high pressure pump goes through the main 9 and the spool 8 to the tank 4, and Line 11 of pump 6 of high capacity through the spool 5 of the reverse, line 10, gold nick 8 switching pumps entering the cavity of the cylinders 1 under pressure settings of the overflow zone O

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it, and from the discharge line 11 of the high-capacity pump 6, through the reverse spool 5, main 10, pump switching spool 8 and main 15 enters the working cavities of the cylinders 1 under pressure of the overflow spool 7. Drain from non-force cavities of the cylinders 1 through the main 18 and the spool 5 of the reverse in the drain line 12. As a result, the cylinders 1 with high speed move the movable workpiece to the fixed. At that moment when boil

vaemze blanks closer, but their

The contact has not yet happened, the left electromagnet of the spool 8 is turned off and the right electromagnets of spools 8 and 14 are turned on. As a result, the main line 11 of the high-capacity pump 6 through the spool 5 of the reverse, the pump switching spool 8 and the drain ctppajib 12 communicate with the tank 4, and The pressure pipe 9 of the high-pressure pump 2 through the spool 8 and the pipe 15 is connected to the power papost 1 of the cylinder 1 and also through the valve 14 with the spool 16, tuned to the pressure of the first compression stage. Since the capacity of the high pressure pump 2 is much lower than the performance of the pump 6, then at the indicated switchings, the speed of the cylinders and the workpiece is sharply reduced and the workpieces of the overflow valve 16 will smoothly come into contact under pressure. Oil displaced from the left non-force cavities cylinders 1, through line 18, spool 5 and drain line 12 enters the tank. In this case, the first heating stage will be carried out.

At the end of the first heating stage, the left electromagnet of the spool 5 remains on, the right electromagnets of the spools 8 and 14 are turned off and the left electromagnet - nitro of the spool 8 is turned on again, the oil from the high pressure pump through the main 9 and the main spool 8 enters the tank 4, and from the pressure main 11 pump 6 large capacity through the spool 5 of the reverse, line 10, the valve 8 switching pump enters the strong cavity of the cylinder 1 under the pressure setting overflow zone

Lotter 7, corresponding to the second heating stage.

After the second heating stage has passed, the left electromagnet of the spool 8 is turned off and the right electromagnet of the spool 8 and the left electromagnet of the spool 14 are turned on. As a result, the high pressure pipe 9 of the high pressure pump 2 through the spool 8 and the main 15 is connected to the power cavities of the cylinders 1 and through the valve 14 - with spool, 17. Under the pressure of the adjustment of the latter, a third heating stage is produced.

At the end of the heating cycle of the welded blanks, the electromagnet of the spool 14 is disconnected. As a result, the power cavities of the cylinders 1 are under the highest forging pressure, to which the overflow valve 3 is tuned.

After the completion of the forging and unclamping of one end of the product, the right electromagnet of the spool 8 and the left electromagnet of the spool 5 are turned off, and. include: a left spool electromagnet 8 and a right electromagnet spool 5. The high pressure pump is unloaded, and the high-pressure pump line 11 of the high-capacity pump is connected to the non-force cavities of cylinder 1 and the power cavities through the main pipe 15, spool 8. , line 10 and spool 5 - with drain line 12. Thus.

Editor P.Kossey Order 3650/16

Compiled by I.Felitsin

Tehred N. Bonkalo Proofreader I. Muska

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

ten

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the machine is quickly retracted to its original position. The unloading of the high pressure pump according to the described scheme allows unloading it 5 not only during auxiliary operations, but also during the forced approach of the workpieces, the second heating stage and during the removal of the welded product, i.e. during all welding cycles in which it does not participate, which increases the efficiency of the welding machine, since the system is practically not heated and there is no need to use an oil cooling system. I

In addition, in the described solution, during the first and third steps of heating the workpieces, simultaneous transmission of one channel does not take place by connecting one of the outputs of the switching valve of the pump with drainage and additionally turning on the left magnet of the reverse spool (switching on the electromagnet does not relate to the unloading cycle of both pumps) spool reverse costs both therefore it is possible

20

25

thirty

35

pumps,

the use of a smaller reverse spool, i.e. lower cost, which also increases the efficiency of the welding machine.

The use of the proposed welding machine reduces the cost of its hydraulic drive by 3% and its electricity consumption by 11%.

Claims (1)

Friction welding machine, including clamps for welded parts and associated with one of them an axial pressure drive, consisting of 111МШ hydraulic cylinders connected by high-pressure and high-pressure pumps with high-pressure pumps using a pressure switch, including a pump control valve, in the neutral position of which one of the inlets is connected to the high-pressure pump, and one of the exits to the working cavities of the hydraulic cylinders, and a drain line, characterized in that, in order to increase its efficiency by completely unloading the high pressure pump and reducing the size of the reverse spool, not connected to the working cavities output switching valve cylinders pumps connected to its associated high pressure pump with the inlet and with the drain line. SU „„ 1242321 A1