KR20090016940A - Electrical upset device for manucturing a exhaust valve and method thereof - Google Patents

Abstract

A compound forging electric upset apparatus for manufacturing an integral type extra long exhaust valve for a ship is provided to improve durability of the extra long exhaust valve by forming a head part with a closed-packed texture. A compound forging electric upset apparatus for manufacturing an integral type extra long exhaust valve for a ship comprises the following units. A clamp(110) penetrating a material(10) is fixed to support movement of the material. An anvil(120) moves in a direction of facing the clamp. An upsetting cylinder(130) pressurizes the material to move a location of the anvil. An current controller(210) controls output of the current and applies the current to the anvil and the clamp. A current compensator verifies changes of the current according to the interval difference of the anvil and the clamp, control the current controller, and maintains the current to coincide with a target current value.

Description

Electric upset device for manucturing a exhaust valve and method for manufacturing ultra long shaft integrated exhaust valve for ship

The present invention relates to an exhaust valve forming apparatus for use in large vessels, and more specifically to the formation of the exhaust valve through the electric upset process, but for a new type of vessel for forming a dense structure can be made The present invention relates to a composite forged electric upset device for producing an ultra long shaft integrated exhaust valve.

In general, the exhaust valve of the engine parts used in large ships is one of the parts that are severely damaged because it is always in contact with the hot gas because the exhaust valve is a part for controlling the combustion gas.

On the other hand, the exhaust valve can be manufactured by a variety of methods, there is also a method of molding the material to the final shape through a repeated forging process, but mainly forging after preforming the head portion using the electric upset (upset) process A method of forming into the final shape of the preformed head portion through the process is mainly used.

At this time, the preforming process of the head portion using the electric upset process inserts the head portion of the material between the anvil in the movable state and the electrode installed in the fixed state and then flows a current to generate resistance heat. Then, the material is pressed to the anvil side and the anvil is retracted to form the head portion.

The molding process of the exhaust valve using the electric upset technique described above is the same as that disclosed in Korean Patent Publication No. 0147529.

However, in the above-described conventional electric upset technology, as the upset process proceeds, the distance between the anvil and the electrode increases, so that the current flowing through the material between the anvil and the electrode is gradually reduced.

Therefore, the problem arises that the head portion of the preformed state is not dense and irregular in structure. This is the same as the respective photographs of FIG. 1 attached.

For this reason, conventionally, the raw material for manufacturing the said exhaust valve is employ | adopted as the nickel-chromium alloy (Nimonic) excellent in heat resistance and oxidation resistance.

However, since the nickel-chromium alloy is considerably expensive, there is a problem that the overall manufacturing cost is inevitably raised.

Therefore, in the related art, many studies have been made to reduce the manufacturing cost of the exhaust valve, and one example thereof may include Korean Patent Publication No. 10-0708615. In this case, the above-described technique proposes a method of manufacturing only the head portion of the exhaust valve by using a nickel-chromium alloy and then joining them with other low-cost materials forming the valve rear end.

However, since the exhaust valve is not formed as a single body as a whole, there is a risk of damage to the joint between the two materials, and the manufacturing method also has problems such as an increase in manufacturing cost due to the addition of the joining process.

In addition, the exhaust valve produced by the above technique still has the problem that the structure is not dense and irregular.

The present invention has been made to solve the various problems of the prior art described above, the object of the present invention is to allow the formation of the exhaust valve through the electric upset process, so that the formation of a dense structure can be made The present invention aims to provide a composite forging electric upset device and a control method thereof for manufacturing a new type of ultra long shaft integrated exhaust valve for ships, which enables the formation of an exhaust valve having excellent durability even if manufactured from a relatively inexpensive material.

According to the composite forging electric upset apparatus for manufacturing an ultra long shaft integrated exhaust valve for ships of the present invention for achieving the above object, while the front end of the material for up-set work is passed through to support the movement of the material Fixedly installed clamps; An anvil positioned on the front end side of the material passing through the clamp, the anvil being movable along with the clamp while moving in an opposite direction to the clamp; An upsetting cylinder for pressing the material to the side where the anvil is located; A power controller configured to provide a current to the anvil and the clamp and to adjust the output of the current; And a current compensator for compensating the current to maintain a target current value while controlling the power control unit by checking a change in current according to a change in distance between the anvil and the clamp.

The current compensator may include a current sensing unit configured to sense and transmit current flowing along an anvil, a clamp, and a material; A voltage sensing unit for receiving and transmitting a feedback value of a current voltage; And a power controller configured to send a signal to the power controller to adjust the output according to the values of the current and voltage received from the current sensor and the voltage sensor.

In addition, the Scott transformer for converting the three-phase power to a single-phase power source is characterized in that it further comprises.

In addition, it is characterized in that it further comprises a current converter for converting a low current provided through the power control unit to a current sufficiently high for heating the material.

And, according to the molding control method of the material for achieving the above object a first step of providing a material to the clamp; A second step of pressing the material toward the anvil; A third step of heating the material by applying a current to the anvil and the clamp; A fourth step of preforming the material while continuing to pressurize the material to the anvil side while moving the anvil is included, and the fourth step includes a change in current according to a change in distance between the anvil and the clamp. The current compensation step of continuously checking and compensating for the current to reach the target current value is included.

Here, the third step is characterized in that is carried out when the pressure of the anvil and upsetting cylinder reaches 2kg / ㎠.

In addition, the current compensation step of the fourth step is characterized in that the control to compensate the current by a predetermined value according to the distance between the anvil and the clamp.

The electric upset device and the molding control method using the same according to the present invention as described above has the effect of improving the durability by allowing the head portion of the large ship exhaust valve to form a dense structure.

In particular, due to the above-described effects, the material of the exhaust valve can be manufactured with a relatively inexpensive material, and thus the manufacturing cost can be reduced.

Hereinafter, with reference to the preferred embodiment of the above-described composite forging electric upset device (hereinafter, referred to as "electric upset device") and the molding control method of the material using the same for manufacturing the ultra long shaft integrated exhaust valve of the present invention. This will be described with reference to FIG. 5.

1 is a schematic view showing the structure of an electric upset device according to a preferred embodiment of the present invention.

As can be seen through this, the electric upset apparatus according to the preferred embodiment of the present invention is largely divided into an upset working part 100 and a power supply part 200.

This will be described in detail for each configuration as follows.

First, the upset working unit 100 will be described.

The upset working part 100 is a series of configurations for preforming the tip portion (the portion of the exhaust valve head portion) of the material 10 by an up-set process, and includes a clamp 110 and anvil. And an upsetting cylinder 130.

Here, the clamp 110 is a series of components to support the movement of the material 10 for the upset operation and to serve as an electrode, the front end of the material 10 is passed through the It is fixedly installed to support movement.

In addition, the anvil 120 is a series of components that play a role of an electrode to allow current to flow along the material 10 together with the clamp 110, and the material 10 penetrates the clamp 110. Located at the front end side of the, is installed to be movable in a direction opposite to the clamp (110).

In this case, a configuration of moving the anvil 120 may include a cylinder (not shown).

That is, the anvil 120 is configured to be moved close to the clamp 110 or moved away from the clamp 110 by the cylinder.

In addition, the upsetting cylinder 130 is a series of configurations for pressing the material 10 to the side where the anvil 120 is located, the front end of the material 10 is always in contact with the anvil 120 It is operated to be maintained as.

At this time, the upsetting cylinder 130 is located on the outer side of the clamp 110, the rod of the upsetting cylinder 130 on the rear end side of the material 10 is installed through the clamp 110 ( 131 is configured to be pressurized while in contact.

The cylinder of the anvil 120 constituting the upset working part 100 and the upsetting cylinder 130 are operated under the control of the power supply unit 200 to be described later.

Next, the power supply unit 200 will be described.

The power supply unit 200 is a series of components selectively provided to the upset working unit 100 after receiving power from the Scott transformer 310 forming various power generation facilities, and processing the power supply unit 210 and the current. Compensation unit is included. At this time, the Scott transformer 310 serves to convert the three-phase power to a single-phase power.

Here, the power control unit 210 provides a current to the anvil 120 and the clamp 110, it is a series of configurations that can adjust the current.

The current compensator checks a change in current according to a change in distance between the anvil 120 and the clamp 110 to control the power regulator 210 and compensates the current to maintain a target current value. The configuration includes a current sensing unit 220, a voltage sensing unit 230, and a power controller 240.

In this case, the current sensing unit 220 is configured to sense the current flowing along the anvil 120, the clamp 110, and the material 10 to transmit to the power controller 240, a current meter 221 is included.

In addition, the voltage sensing unit 230 is configured to receive feedback of the value of the current voltage and transmit it to the power controller 240, and includes a voltage meter 231.

In addition, the power controller 340 is the power control unit (210) so that the power control unit 210 adjusts the output according to the value of the current and voltage received from the current sensing unit 220 and the voltage sensing unit 230 210) to send a control signal.

In this case, the power controller 240 compares the current value and the voltage value provided from the current sensing unit 220 and the voltage sensing unit 230 with the current value and the voltage value previously provided to the power control unit 210. Has a PLC program programmed to control its output.

Reference numeral 320 is a main switch, receives power from the Scott transformer 310 serves to provide power to each of the components constituting the power supply unit 200 and the upset working unit 100.

Meanwhile, the embodiment of the present invention suggests that the current converting unit 140 is further included in the upset working unit 100 among the components of the above-described electrical upset apparatus.

In this case, the current converter 140 converts the low current provided through the power control unit 210 into a sufficiently high current for heating the material 10.

In the following, the molding control method of the material 10 using the electric upset device according to the embodiment of the present invention described above will be described in more detail for each process.

First, the anvil 120 and the upsetting cylinder 130, when the main power and the control power are turned on, are moved to the automatic driving position in accordance with the specification of the material 10.

In this state, the material 10 is installed in the clamp 110. In this case, the front end of the material 10 is installed through the clamp 110, the rear end of the material 10 is installed in a state capable of pressing by the rod 131 of the upsetting cylinder 130.

When the above-described series of preparation procedures are completed, the main switch 320 for performing the operation is turned on.

As described above, when the main switch 320 is turned on, the material 10 is pressed toward the anvil 120 while the upsetting cylinder 130 is driven. In this case, the pressure of the anvil 120 and the upsetting cylinder 130 is 2 kg / through a cylinder for moving the anvil 120 and / or a load cell (not shown) installed in the upsetting cylinder 130. When it is confirmed that the cm 2 is reached, the power controller 240 controls the power control unit 210 to flow a current to the anvil 120 and the clamp 110 to start the heating of the material 10.

At this time, the current is provided to the upset working part 100 through the power control unit 210, the current converter 140 of the upset working part 100 receives the provided low current of the material 10 The heating of the material 10 is started by converting it into a sufficiently high current for heating and flowing it to the anvil 120 and the clamp 110.

When the heating of the material 10 is performed as described above, the anvil 120 is gradually moved in a direction away from the clamp 110 as shown in FIG. 2, and the upsetting cylinder 130 is performed. While operating the control of the material 10 is operated to press the state in contact with the anvil 120 is moved as described above. This allows the current provided to the anvil 120 and the clamp 110 to continuously flow through the material 10, and to allow the tip portion of the material 10 to gradually increase in diameter. For sake.

Therefore, the tip of the material 10 is preformed into a shape that can be processed into the head portion of the large ship exhaust valve as shown in Figs.

In addition, the power controller 240 receives the current value and the voltage value from the current sensing unit 220 and the voltage sensing unit 230 while the above-described series of processes are in progress. Check the current change continuously according to the distance between them.

This is because, as the distance between the anvil 120 and the clamp 110 increases, the electrical resistance increases as the distance increases, and the electrical resistance increases as the temperature of the material 10 increases, so that when the voltage is constant, the anvil This is because the current flowing in the material 10 between the 120 and the clamp 110 becomes small.

Accordingly, the power controller 240 provides a signal for controlling the output of the power controller 210 to the power controller 210 to maintain the target current value based on the change in the current. The current flowing along the material between the anvil 120 and the clamp 110 is always kept constant.

That is, when it is determined that the current is smaller than the target current value as the distance between the anvil 120 and the clamp 110 increases, the anvil 120 increases by increasing the current output through the power controller 210. The current flowing along the material 10 between the clamp 110 and the clamp 110 is to be always kept constant.

In addition, when the preforming of the exhaust valve material 10 through the above-described series of processes is completed, the operation of the upsetting cylinder 130 and the anvil 120 is stopped, and the clamp 110 is separated and then the preformed. The work is completed by taking out the completed material 10.

As a result, in the electric upset apparatus according to the embodiment of the present invention described above, the head part of the exhaust valve, which has been completely molded, becomes dense due to the upset operation through constant supply of a constant current. This is the same as each reference picture of FIG. 5.

On the other hand, the material shaping control method of the electric upset apparatus according to the present invention is not limited to the embodiment using the above-described sensing value of the current sensing unit 220.

For example, in the state where the current compensation value according to the distance change between the anvil 120 and the clamp 110 is previously tabled in the power controller 240, the distance change amount is continuously sensed, and the table is pre-tabled according to the distance change amount. There may also be a method of controlling the current to be compensated by the current value.

Of course, the above-described process is further preferably a step of controlling to further compensate for the current by a predetermined value according to the temperature of the material (10). This is because the effect of electrical resistance is greatly applied not only to the distance between the anvil 120 and the clamp 110 but also to the temperature.

1 is a block diagram schematically showing the structure of an electric upset device for manufacturing an ultra long shaft integrated exhaust valve for a ship according to a preferred embodiment of the present invention

2 to 4 is a schematic diagram showing a molding process of a material using an electric upset device for manufacturing a super long shaft integrated exhaust valve for ships according to a preferred embodiment of the present invention

Figure 5 is a state diagram shown to explain the state of the tissue for each part after the molding of the material using the electric upset device for manufacturing the integrated exhaust valve for ships according to a preferred embodiment of the present invention

Claims (8)

A clamp fixedly installed to support movement of the material while the front end of the material for up-set work is penetrated; An anvil positioned on the front end side of the material passing through the clamp, the anvil being movable along with the clamp while moving in an opposite direction to the clamp; An upsetting cylinder for pressing the material to the side where the anvil is located; A power controller configured to provide a current to the anvil and the clamp and to adjust the output of the current; And, Ultra long shaft integrated exhaust valve for ships comprising: a current compensator for checking the change in the current according to the change in distance between the anvil and the clamp to compensate for maintaining the target current value while controlling the power control unit Combined forging electric upset device for manufacturing. The method of claim 1, The current compensator A current sensing unit for sensing and transmitting current flowing along the anvil, the clamp, and the material; A voltage sensing unit for receiving and transmitting a feedback value of a current voltage; Manufacturing a super long-axis integrated exhaust valve for ships comprising a power controller for sending a signal to the power control unit to adjust the output according to the value of the current and voltage received from the current sensing unit and the voltage sensing unit Combined forging electric upset device. The method of claim 1, An electric upset apparatus of multiple forging for manufacturing a super long shaft integrated exhaust valve for ships, characterized in that it further comprises a Scott transformer for converting three-phase power to single-phase power. The method according to any one of claims 1 to 3, An electric upset apparatus for a composite forging for manufacturing an ultra long shaft integrated exhaust valve for a ship, characterized in that it further comprises a current converter for converting a low current provided through a power regulator into a sufficiently high current for heating the material. Providing a material to the clamp; A second step of pressing the material toward the anvil; A third step of heating the material by applying a current to the anvil and the clamp; A fourth step of preforming the material while moving the anvil and continuing to pressurize the material to the anvil side; The fourth step includes a current compensating step for continuously compensating for the current to reach the target current value by checking the change of the current according to the change of the distance between the anvil and the clamp. Forming control method of the ultra long shaft integrated exhaust valve for ships using the. The method of claim 5, wherein The third step is Forming control method of the ultra long shaft integrated exhaust valve for ships using the electric upset device of the composite forging, characterized in that when the pressure of the anvil and the upsetting cylinder reaches 2kg / ㎠. The method of claim 5, wherein The current compensation step of the fourth step Forming control method of the ultra long shaft integrated exhaust valve for ships using the electric upset device of the composite forging, characterized in that the control to compensate the current by a predetermined value according to the distance between the anvil and the clamp. The method of claim 7, wherein In the current compensation step of the fourth step And controlling the current to be compensated by a preset value according to the temperature of the material.

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