KR101179961B1 - Vacuum heat treatment furnace - Google Patents

Abstract

PURPOSE: A vacuum heat treatment furnace is provided to improve airtight seal in vacuum and compression processes by employing a deformation correcting member to correct deformation or drooping. CONSTITUTION: A vacuum heat treatment furnace comprises a chamber(110) providing a space for heat treating an object, a door(120) opening and closing the opening of the chamber, a pivot shaft(130) connected to the door to form the rotational center axis of the door, and a door support(140) connecting the door and the pivot shaft. A bearing is embedded in the pivot shaft to help smooth rotation of the door. A door deformation correcting member is provided in a door connecting part of the door support to correct deformation or drooping of the door.

Description

Vacuum heat treatment furnace

The present invention relates to a vacuum heat treatment furnace, and more particularly, not only has a simple and efficient structure, but also can easily open and close the door with respect to the chamber with a small force, The present invention relates to a vacuum heat treatment furnace capable of correcting sag caused by self weight and greatly increasing the convenience of use and vacuum and pressure tightness than conventional heat treatment furnaces.

The heat treatment furnace is a general term for a furnace that heats an object to be treated (metal, nonferrous metal, etc.) under an appropriate temperature and vacuum atmosphere, and cools it with a high-pressure cooling gas through a predetermined step to improve the properties of the material or perform welding such as brazing.

The annealing furnace is a typical heat treatment furnace, and there are continuous, batch, non-oxidation combustion, and vacuum heat treatment furnaces.

Among them, the vacuum heat treatment furnace is a device that forms a desired material by placing the object in a chamber and performing heat treatment. In particular, since the heat treatment is performed in a vacuum state, contamination from the surroundings is relatively low, and penetration of the solvent into the joint part during brazing welding is relatively low. It is made uniform and there is an advantage of improving the bonding.

However, in the case of such a vacuum heat treatment furnace, the interior of the chamber must maintain a high vacuum state, and the pressurized cooling gas such as nitrogen must be maintained at a high pressure state, so the door for opening and closing the opening of the chamber is also applied as a heavy structure with a heavy weight. When such a door is applied, if a large amount of force is required to open and close the door, the ease of use may be remarkably degraded, and the airtightness may not be compensated for during deformation or sag caused by self-weight due to vacuum or pressure. Since this may lower the productivity of the heat treated product significantly, a structural improvement in view of such a problem is required.

US2003 / 0160088 A1 US2002 / 0195439 A1 US 6349108 B1 JP 2002-005575 A

The object of the present invention is not only to have a simple and efficient structure, but also to easily open and close the door with respect to the chamber with a small force, and to correct the deflection caused by deformation or self-weight in use by using the deflection deflection correction member, It is to provide a vacuum heat treatment furnace that can greatly increase the ease of use and vacuum and pressure tightness than the heat treatment furnace of.

The object of the present invention is to form a place where the treatment object is heat-treated, the chamber is formed on one side of the entrance to the treatment object; A door that pivotally opens and closes the entrance and exit of the chamber; A pivot shaft connected to the door to form a center of rotation of the door; And a door support connecting the door and the pivot shaft, wherein the pivot shaft includes a bearing for smooth rotation of the door.

The door support may include an arm having one end rotatably coupled to the pivot shaft and the other end coupled to the door side; A handle provided in an end region of the arm; And a door connection part connecting the arm and the door in a central area of the door.

The door connection area may further include a door deformation deflection correction member for correcting deflection due to deformation or self weight during use of the door.

The door deformation deflection correction member may be a bolt disposed in a plurality in the circumferential direction of the door connecting portion and vertically disposed in the direction in which the door is coupled to the chamber.

The door fixing unit may further include a door fixing unit configured to fix the door in a completely open state.

The door fixing unit, a magnet provided in any one of the chamber and the pivot shaft; And a stopper flange provided in the other one of the chamber and the pivot shaft to be magnetically coupled or decoupled with the magnet.

A double packing member may be provided at the entrance / opening area of the chamber to maintain airtightness with the door.

An electrode provided in the chamber; And an electrode cooling water supply unit for supplying cooling water directly to the center of the electrode.

It may further include an external cooler (HOT EXHAUST) provided on the outside of the chamber to cool the chamber.

A plurality of external coolers may be provided, and the plurality of external coolers may be connected to each other by a cooling pipe, and a blower may be provided at one side of the cooling pipe.

A pressure sensor capable of sensing a pressure in the chamber; And an electrical contact pressure gauge measuring the pressure in the chamber; And a control valve capable of adjusting the pressure on and off before the pressure in the chamber reaches a set pressure limit. And a relief valve that operates when the pressure in the chamber reaches a set threshold.

According to the present invention, not only has a simple and efficient structure, but also can easily open and close the door with respect to the chamber, so that the ease of use can be greatly increased than the conventional heat treatment furnace, and the deformation deflection correction member is used. It is possible to correct deformation during use or deflection caused by self-weight due to vacuum or pressurization, thereby improving heat treatment efficiency by improving airtightness during vacuum and pressurization, thereby significantly increasing the productivity of the product than conventional heat treatment furnaces. There is.

1 is a side structural view of a vacuum heat treatment furnace according to an embodiment of the present invention.
2 is an image of a door area.
3 is an image of a door fixing area.
4 is an image of a double packing member region.
5 is a front structural view of the door area in FIG.
6 is a partial plan view of FIG. 1.
7 is a partial structural diagram of a pressure regulating unit for regulating pressure in a chamber.
8 is a partial structural diagram of a pressure regulating unit provided with a relief valve.
9 is a partial structural diagram of a cooling water supply unit for an electrode.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a side structural view of a vacuum heat treatment furnace according to an embodiment of the present invention, FIG. 2 is an image of a door area, FIG. 3 is an image of a door fixing part area, FIG. 4 is an image of a double packing member area, and FIG. FIG. 1 is a front structural view of the door region, FIG. 6 is a partial plan view of FIG. 1, and FIG. 7 is a partial structural view of a pressure regulating unit for regulating pressure in the chamber, and FIG. 8 is a part of a pressure regulating unit provided with a relief valve. 9 is a partial structural diagram of a cooling water supply unit for electrodes.

As shown in these figures, the vacuum heat treatment furnace according to the present embodiment, the chamber 110, the door 120 for opening and closing the opening and closing of the chamber 110, and the door 120 is connected to the door ( A pivot shaft 130 forming a rotation axis of the 120 and a door support 140 connecting the door 120 and the pivot shaft 130 are included.

The chamber 110 is a kind of tank made of metal and forms a place where the object to be treated is heat treated.

Unlike the conventional chamber 110 of the present embodiment forms a large structure extending from 1200mm to 1550mm. Therefore, the heat treatment yield of the object to be treated per unit time can be significantly improved than in the prior art.

In addition, the heat treatment process for the object to be processed in the chamber 110, unlike the prior art, for example, by going through a temperature and time of eight steps, it is possible to significantly shorten the heat treatment time.

On one side of the chamber 110 is a pressure sensor 151 that can sense the pressure in the chamber, an electrical contact pressure gauge 152 that measures the pressure in the chamber, the pressure is turned on and off before the pressure in the chamber reaches a set threshold An adjustable control valve and a relief valve 153 which operates when the pressure in the chamber is above a set threshold and a warning lamp (not shown) for generating a warning signal when the control valve is operated may be further provided.

One side of the chamber 110 in which the door 120 abuts is formed in the entrance opening for the processing object. After the door 120 is opened, the object to be processed may enter the chamber 110 through the entrance and exit of the chamber 110.

For reference, the object to be treated may be a metal or a non-ferrous metal, and the characteristics of the material may be improved by welding or heating under appropriate temperature and vacuum atmosphere in the chamber 110, and welding may be performed.

As shown in FIG. 4, double packing members 111 and 112 are provided in the opening and closing area of the chamber 110 to maintain airtightness with the door 120. Conventionally, only one packing member has been used, but in the present invention, double packing members 111 and 112 are used to improve airtightness during vacuum and pressurization. The double packing members 111 and 112 may be the same, or different sizes and cross-sections may be used. The double packing members 111 and 112 may float with the circular packing member 111 and may float while being vacuumed and pressurized. The use of 112 is preferred.

The double packing member 111 improves airtightness when both the door 120 is closed and the chamber 110 is pressurized when the inside of the chamber 110 is in a vacuum state or when a cooling gas such as nitrogen is injected.

The door 120 pivotally opens and closes the entrance and exit of the chamber 110. Since the inside of the chamber 110 can maintain high vacuum and maintain high pressure, the door 120 may be provided in a huge structure.

The pivot shaft 130 is a structure that is connected to the door 120 to form the axis of rotation of the door 120 is disposed long along the vertical direction.

A bearing (not shown) for smooth rotation of the door 120 is embedded in the pivot shaft 130. The bearings may vary from ball bearings to rolling bearings, and one or two or more bearings may be disposed inside the pivot shaft 130 to induce smooth rotation of the door 120. Therefore, the door 120 may be smoothly rotated with less force than before.

The door support 140 is a structure connecting the door 120 and the pivot shaft 130, and serves to connect the door 120, which is a huge structure, to the pivot shaft 130.

The door support 140 is rotatably coupled to one end of the pivot shaft 130 and the other end of the door 141 is coupled to the door 120, and a handle 142 provided at an end region of the arm 141. ), And a door connecting portion 143 connecting the arm 141 and the door 120 in the central region of the door 120.

The door deformation deflection correction member 145 is provided in the door connection portion 143. As the number of times of use of the door 120 accumulates, plastic deformation may occur due to expansion or contraction due to repeated loads by vacuum and pressure, and sag may occur due to its own weight as a huge weight structure for maintaining the airtightness of the chamber. . In order to prevent a decrease in heating and cooling efficiency and to increase the heat treatment efficiency, it is necessary to maintain the airtightness of the chamber 110, and therefore, a means for correcting deformation and deflection during use is necessary. In the present exemplary embodiment, the door deformation deflection correction member 145 is provided with a bolt, and a plurality of door deformation deflection correction members 145 are disposed along the circumferential direction of the door connection part 143 to compensate for the deformation of the door 120 when the door 120 is deformed. . According to one embodiment of the present invention, four bolts are provided on an axis passing through the center of the door connecting portion 143 orthogonally, and the door 120 is divided into four quadrants of 90 degree intervals. Correct deformation or deflection. The position of the door deformation deflection correction member 145 from the center of the door connecting portion 143 is provided with a first correction member at the upper end of the arm 141 to correct the deflection of the quadrant including the upper end of the arm 141, and The second correcting member is provided with a second correcting member at the lower end of the arm 141 to correct the deflection of the quadrant including the lower end of the arm 141. Similarly, at the same distance from the center of the door connecting portion 143 as the positions of the first and second correcting members, the third and fourth correcting members are installed on the left and right sides of the center of the door connecting portion 143 to form the left side of the arm 141. The quadrant including the stage and the quadrant including the right side of the arm 141 are deformed and corrected so that deformation or deflection due to expansion or contraction during use or deflection due to self-weight is applied to the entire circumferential and radial directions of the door 120. Uniform and precise calibration improves airtightness.

In other words, the bolt as the door deformation deflection correction member 145 may be provided along the direction in which the door 120 is coupled to the chamber 110, and by tightening the bolt, the door 120 receives the force in the opposite direction. Deformation or deflection of the door 120 can be corrected.

As shown in FIG. 3, the vacuum heat treatment furnace of the present embodiment is provided with a door fixing part 146 which fixes the door 120 in a state in which the door 120 is completely opened.

The door fixing part 146 includes a magnet 146a provided in the chamber 110 and a stopper flange 146b provided in the pivot shaft 130 and magnetically coupled or decoupled with the magnet 146a. .

When the stopper flange 146b is fully opened, the stopper flange 146b is positioned close to the magnet 146a to magnetically couple with the magnet 146a to support the fully open state of the door 120. As such, the fully open state of the door 120 is supported to prevent the occurrence of a safety accident such as the door 120 being arbitrarily closed.

In this embodiment, the magnet 146a is provided as a permanent magnet, but may be applied as an electromagnet as necessary.

In the present embodiment, the magnet 146a is provided in the chamber 110, and the flange 146b for the stopper is provided in the pivot shaft 130, but the reverse may be sufficient. That is, it is also possible that the stopper flange 146b is provided in the chamber 110 and the magnet 146a is provided in the pivot shaft 130.

The heat treatment furnace of this embodiment is supplied with pressurized cooling gas such as nitrogen to cool the heat treated product to obtain the required physical properties of the gas supply pipe. The chamber 110 that can adjust in advance the pressure control unit 150 is installed. Conventionally, only one pressure sensor for pressure is applied when nitrogen gas is pressurized, which may lead to a large accident when the pressure sensor for pressure is malfunctioned. Vacuum For 600kg for example sikimyeo the surface area to nitrogen gas 2kg / cm ² pressure force of about 45 tons when pressed by the front door damage the clutch by acting on the door, and fly is the door is separated from the door support by a pressure Can be. In order to prevent this, in the present invention, the pressure control unit 150 that can adjust the pressure on and off before the pressure in the chamber 110 reaches the set pressure limit, to detect the pressure in the chamber as a primary safety device. Pressure sensor 151, an electrical contact pressure gauge 152 that measures the pressure in the chamber 110 as a secondary safety device, and acts when the pressure in the chamber 110 as a third safety device reaches a set limit. It may further include a mechanical relief valve 153.

Conventionally, only a primary pressure sensor 151 for operating above a set limit is provided so that when the primary pressure sensor 151 breaks down, the pressure of the chamber 110 rises, resulting in equipment damage and oxidation, deformation, etc. Although a large loss occurred in the present invention, in the present invention, a mechanical relief valve 153, which is a third safety device, is installed when a second safety device is an electric contact pressure gauge 152 that is a second safety device, or a second safety device is a third pressure device. The heat treatment work can be continued by preventing an accident due to the pressure increase in the chamber 110. When the primary pressure sensor 151 and the secondary electric contact pressure gauge 152 fail, the operator operates the warning lamp. Normalization measures can be taken for system anomalies.

The pressure regulating unit 150 in the chamber 110 is a check valve that is controlled by an on / off solenoid valve by sensing a pressure in a gas supply pipe by a control unit. The pressure in the supply pipe is turned on and off before the system is stopped due to the operation of the relief valve. By controlling the feedback, the heat treatment can be continued, the pressure is released to protect the equipment, and the operation of the warning lamp allows the system to check and correct any abnormalities.

On the wall surface of the chamber 110 of the vacuum heat treatment furnace of this embodiment, an electrode 171 is provided as a means for heat treatment as shown in FIG. In this case, the durability may be improved by directly supplying the cooling water to the center of the electrode by the electrode cooling water supply unit 170.

The conventional electrode has a problem that the cooling efficiency is lowered by supplying cooling water to the outside of the insulating material surrounding the electrode to cool, and the durability decreases due to an increase in temperature of the electrode. By installing the coolant jacket 174 around the electrode and connecting the electrode side pipe assembly 172 so that the coolant can be directly supplied, the coolant can directly cool the electrode 171 to increase the cooling efficiency. The durability can be improved.

Meanwhile, referring back to FIG. 1, external coolers HOT EXHAUST 161 to 163 may be provided outside the chamber 110 as a means for cooling the chamber 110. The conventional high pressure gas cooler is installed inside the chamber, and if the coolant is leaked from the heat exchanger of the cooler, it may damage the product. There was a costly problem. In addition, the space for storing the heat treatment product of the chamber is reduced, and the constraint of not being able to sufficiently cool the capacity is followed. Therefore, a lot of cooling time is required, and there are many limitations in improving the heat treatment efficiency.

In the case of the present embodiment, a plurality of external coolers 161 to 163 are disposed at respective positions outside the chamber 110. These external coolers (161 ~ 163) can be repaired from the outside in the event of a breakdown, convenient maintenance, low cost because there is no need to disassemble the whole equipment, cooling time because there is no loss of product storage space of the chamber 110 There is an advantage that can be installed further to have enough capacity to shorten the time. The plurality of external coolers 161 to 163 are connected to each other by the cooling pipe 165. A blower 166 is provided at one side of the cooling pipe 165. When the blower 166 is operated, the inside of the chamber 110 may be cooled by being directed to the chamber 110 via the external coolers 161 to 163 through the cooling pipe 165.

Heat exchangers are respectively installed in the external coolers 161 to 163, and the coolant is supplied to the heat exchangers through the coolant supply unit for the heat exchanger.

As such a large number of external coolers (161 ~ 163) is applied, it is not necessary to reduce the capacity of the chamber 110 to facilitate the maintenance due to the leakage of cooling water from the outside of the chamber. The more the external coolers (161 to 163), the higher the cooling efficiency can be, but the number is optimized to prevent deformation of the product due to overcooling.

In the present embodiment, unlike the former, the coupling portion of the copper pipe and the cooling water hose of the cooling water supply unit for the heat exchanger cooling the external coolers 161 to 163 is changed to a stainless steel material to improve rigidity and durability. It is increasing.

According to the vacuum heat treatment furnace of this embodiment having such a configuration, not only has a simple and efficient structure, but also can easily open and close the door 120 with respect to the chamber 110 using a deformation deflection correction member. Thus, deformation during use or deflection due to self-weight due to vacuum or pressurization can be corrected, and thus heat treatment efficiency is improved by improving airtightness during vacuum and pressurization, and the productivity of the product can be significantly increased compared to a conventional heat treatment furnace. .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

110: chamber 111: circular packing member
112: floating packing member 120: door
130: pivot shaft 140: door support
141: arm 142: handle
143: door connection 145: door deformation correction member
146: door fixing part 146a: magnet
146b: flange for stopper 150: chamber pressure regulating unit
151: pressure sensor for double pressure 152: electrical contact pressure gauge
153: relief valve 161 to 163: external cooler
165: cooling piping 166: blower
170: cooling water supply unit for the electrode 171: electrode
172: electrode side pipe assembly 173: cooling water supply pipe
174: coolant jacket

Claims (12)

A chamber which forms a place where the object to be treated is heat treated, and an entrance and exit of the object is formed on one side;
A door that pivotally opens and closes the entrance and exit of the chamber;
A pivot shaft connected to the door to form a center of rotation of the door; And
A door support connecting the door and the pivot shaft,
The pivot shaft is a vacuum heat treatment furnace, characterized in that the bearing is built for smooth rotation of the door. The method of claim 1,
The door support,
An arm rotatably coupled to one end of the pivot shaft and the other end coupled to the door side;
A handle provided in an end region of the arm; And
And a door connection part connecting the arm and the door in a central area of the door. The method of claim 2,
And the door deformation deflection correction member is further provided in the door connection area to correct deformation of the door during use or deflection due to its own weight. The method of claim 3,
The door deformation deflection correction member is a vacuum heat treatment furnace, characterized in that a plurality of bolts are disposed in the circumferential direction of the door connection portion and arranged vertically along the direction in which the door is coupled to the chamber. The method of claim 1,
And a door fixing part for fixing the door in a state in which the door is completely opened. The method of claim 5,
The door fixing part,
A magnet provided in one of the chamber and the pivot shaft; And
And a stopper flange provided in the other one of the chamber and the pivot shaft to be magnetically coupled or decoupled with the magnet.

The method of claim 1,
The vacuum heat treatment furnace, characterized in that the double packing member is provided in the entrance opening area of the chamber to maintain the airtightness with the door during the vacuum or pressurization of the chamber. The method of claim 1,
An electrode provided in the chamber; And
And a cooling water supply unit for the electrode for supplying the cooling water to the electrode. 9. The method of claim 8,
The cooling water supply unit for the electrode,
An electrode side pipe assembly connected to the center side of the electrode; And
And a coolant supply pipe connected to the electrode side pipe assembly and supplying coolant to the electrode side pipe assembly. The method of claim 1,
And an external cooler (HOT EXHAUST) provided at an outer side of the chamber to cool the chamber.
The method of claim 10,
A plurality of external coolers are provided,
The plurality of external coolers are connected to each other by a cooling pipe,
Vacuum heat treatment furnace, characterized in that the blower is provided on one side of the cooling pipe. The method of claim 1,
A pressure sensor capable of sensing a pressure in the chamber; And
An electrical contact pressure gauge for measuring the pressure in the chamber; And
A control valve capable of regulating the pressure on and off before the pressure in the chamber reaches a set pressure threshold; And
And a relief valve which operates when the pressure in the chamber reaches a set threshold.

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