JPH0119466B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuous heat treatment apparatus for non-ferrous metal plates, and in particular, a non-ferrous metal plate is brought into surface contact with a carbon plate to directly heat and cool the same, The present invention relates to a continuous heat treatment apparatus for non-ferrous metal plates, which not only improves thermal efficiency but also reduces the size of the apparatus itself.

[Prior Art] In general, the following method is already known as a heat treatment method for removing work hardening caused by rolling treatment (cold working) of a non-ferrous metal plate made of nickel silver, phosphor bronze, etc. from the plate to be treated. ing.

That is, a rolled non-ferrous metal plate (to-be-treated plate) in the form of a strip is wound into a roll shape, this roll-shaped to-be-treated plate is heated in a heating furnace to a temperature higher than the annealing temperature, and then the heated to-be-treated plate is rolled. The plate is gradually cooled to remove work hardening.

However, such a heat treatment method is not a continuous heat treatment method but a batch heat treatment method, and therefore has a problem of very low productivity.

In order to solve this problem, a continuous heat treatment apparatus as shown in FIG. 6 has been proposed.

This processing apparatus includes an electric furnace 41 having an electric heater 40 built therein, and following the electric furnace 41,
It is mainly composed of a cooling device 43 having a water jacket 42 built therein. Then, while the rolled plate S is continuously transferred from the electric furnace 41 to the cooling device 43, the plate is heated to an annealing temperature by radiant heat from the electric heater 40, and then heated to the annealing temperature. The jacket 42 indirectly slows down the cooling.

[Problems to be Solved by the Invention] By the way, according to the above-mentioned conventional example, it is certainly possible to perform continuous heat treatment on the plate S to be treated, and productivity can be improved.

However, in this conventional device, heating is performed indirectly using radiant heat from the electric heater 40 and the heating atmosphere, so the thermal efficiency is approximately 10 to 20.
%, which was very low, and the energy loss was very large.

In addition, since indirect heating is used with poor thermal efficiency as described above, the length of the electric furnace 41 must be increased to about 5 to 10 m in order to raise the temperature of the plate to the predetermined annealing temperature. First, the furnace itself became larger, leading to a rise in equipment costs.

Similarly, in the cooling device 43, indirect cooling is performed in which the internal atmosphere is cooled by the water jacket 42 during slow cooling, and the processed plate S is cooled with this cold heat, so the cooling efficiency is poor. For this reason, in order to cool down to a predetermined temperature, the length of the cooling device 43 itself must be increased to approximately 5 to 10 meters, which is the same length as the electric furnace 41, which has led to a rise in equipment costs.

In particular, among non-ferrous metals, beryllium copper (Be−
Cu), the annealing temperature is around 800℃ and then
When heat treating alloys that require rapid cooling to below 700°C, as mentioned above, conventional equipment has poor cooling efficiency due to indirect cooling. It was not possible to produce good beryllium copper.

[Object of the Invention] The present invention focuses on the above-mentioned problems and has been devised to effectively solve the problems.

An object of the present invention is to directly heat and cool a plate to be processed while it is in surface contact with a carbon plate, thereby not only improving thermal efficiency but also reducing the size of the apparatus itself. An object of the present invention is to provide a continuous heat treatment apparatus for non-ferrous metal plates, which allows for continuous heat treatment of non-ferrous metal plates.

[Summary of the Invention] The present invention achieves the above object by forming a heating section that heats a rolled plate for a predetermined time while sandwiching it between carbon plates in a reducing or inert gas atmosphere. Subsequently, a cooling section is formed in which the heated plate carried out from the heating section is slowly cooled by directly contacting a refrigerant while sandwiching the heated plate between carbon plates in a reducing or inert gas atmosphere. The gist of the present invention is to bring the carbon plate into surface contact with the carbon plate while continuously transporting the carbon plate, thereby performing direct heating and direct cooling.

[Examples] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a plan view showing a continuous heat treatment apparatus for non-ferrous metal plates according to the present invention, Fig. 2 is a partially cutaway plan view showing the heating section, Fig. 3 is an enlarged view of section A in Fig. 2, and Fig. 4 is FIG. 5 is a longitudinal cross-sectional view showing the cooling section, and FIG. 5 is a partially cutaway perspective view showing the internal structure of the cooling section.

This continuous heat treatment equipment as shown in Fig. 1 is used to process a rolled non-ferrous metal plate, that is, a plate S to be treated.
A heating section 1 heats the plate for a predetermined time while sandwiching it between carbon plates in a reducing atmosphere such as H ₂ or an inert gas atmosphere such as N ₂ ; The cooling unit 2 is mainly composed of a cooling unit 2 that gradually cools the cooling medium by directly contacting the cooling medium while holding the cooling unit 2 between the cooling unit 2 and the cooling unit 2.

The heating section 1 and the cooling section 2 are connected in series, and the plate S to be processed, which has already been rolled, is continuously transferred between them by the transfer means 3 from the heating section 1 to the cooling section 2. .

Here, as the plate S to be treated, phosphor bronze, nickel silver,
Nonferrous metal plates (including clad plates) made of tin bronze, brass, beryllium copper, etc. are used.

Specifically, the transfer means 3 includes a roll carry-in device 4 that supplies the plate S to be processed, and a roll carrying device 4 that is located at the most downstream side in the direction of transfer of the plate S to be processed and pulls in the plate S to be processed. It is composed of a driving roller box device 5 that transfers the entire plate to be processed, and a winding device 6 that is located at the most downstream position in the direction of transfer of the plate to be processed and winds up the plate that has been heat-treated.

The roll carry-in device 4 is constructed by rotatably supporting a tension roller 8 on a roll carry-in frame 7. A wound roll 9 is attached to the tension roller 8, which is formed by winding a plate to be heat-treated, which has been previously formed into a band shape with a certain thickness, into a roll shape. By taking out the plates S to be processed can be sequentially supplied. In addition, the driving roller box device 5
is constructed by installing two pairs of drive rollers 11, 11 in the transport direction that sandwich the heat-treated plate S from above and below on a pedestal 10, and each drive roller is connected to a drive source 12 such as a motor. By rotating in the feeding direction by the transmitted driving force, the plate S to be processed is unwound from the band-shaped roll 9 and transported. The winding device 6 includes a winding drum 14 rotatably mounted on a pedestal 13, and is configured to wind up the plate S to be treated after the heat treatment is completed by rotating the drum in the winding direction. There is. A rolling mill 15 is provided upstream of the heating section 2 to cold-roll the plate S to be processed introduced into the heating section 1 by applying pressure from the thickness direction thereof. Specifically, this rolling mill 15 is configured to roll the plate S to be processed by pinching it from the thickness direction with a pair of work rolls 16a, 16a supported by back-up rolls 16, 16, respectively. .

On the other hand, the heating section 2 is hermetically covered as a whole by a housing 17 having a substantially rectangular cross section as shown in FIG. (not shown) is provided. The housing 17 is filled with a reducing gas such as H ₂ or an inert gas such as N ₂ to prevent the substrate S from being oxidized during heating to create a reducing or inert gas atmosphere. being done. In addition, when creating a flammable reducing gas atmosphere such as H ₂ in the heating section, at the beginning of operation _, etc., the housing 1 must be
An inert gas (CO ₂ ) or the like is introduced in advance into the chamber 7, and this inert gas is replaced with H ₂ to prevent an explosion. As shown in FIG. 3, inside this housing 17, the processed plate S is moved in the vertical direction, that is, in the thickness direction, centering on the processed plate S that is transferred through the housing 17. Carbon plates 20, 20 to be pressed and held while in surface contact with the carbon plates 20, 20, and the carbon plate 2
Electrothermal heaters 23, 23 are laminated with uniform steel plates 21, 21 interposed on the opposite side of the surface that comes into contact with the plate S to be processed No. 0, 20, and are insulated by being covered with mica 22, 22 on the upper and lower sides. And this heater 2
Insulating materials 24, 24 made of asbestos or the like and carbon plates 20, 20 are used to sandwich the plate S to be processed with appropriate pressure from the thickness direction, that is, from the top and bottom directions, in order to prevent heat dissipation by the plates 3 and 23. The holding means 25, 25 are respectively laminated in sequence. Here, the thickness of the carbon plates 20, 20 is a thickness that does not reduce thermal efficiency, for example, 5.
~7 mm is desirable.

The holding means 25 is composed of a press plate 26 made of thick carbon steel, for example, and a press member 27 that presses the upper press plate 26 downward from the outside of the housing 17. Appropriate pressure is applied to the plate S to be processed from its thickness direction (vertical direction). The pressure in this case is not so high, and may be sufficient to bring surface contact between the substrate S and the carbon plates 20, 20 to the extent that an atmospheric gas layer is not formed between them. Since it is necessary to allow vertical movement of the press member 27, the upper part of the housing 17 has flexibility in the vertical direction. In addition, the plate S to be processed is a carbon plate 2
Since it is necessary to slide the press member 27 while being held between 0 and 20, an elastic member such as a spring is used as the press member 27 to provide elasticity from above and below and apply appropriate pressure. Furthermore, instead of the carbon plates 20, 20, it is also possible to use stainless steel or the like and bring it into direct contact with the plate to be treated, but in this case, stainless steel cannot be used because it causes galling. .

In particular, in this embodiment, in order to enable cladding treatment in the heating section 1, the press member 27 is constructed so as to be able to output the high pressure necessary for cladding treatment. Therefore, from this point of view as well, the carbon plates 20, 20 have excellent properties such as good slippage, resistance to oxidation, and sufficient resistance to this type of pressure.

Further, power supply lines 28, 28 are connected to the electric heaters 23, 23, and the heating temperature of the plate S to be processed is higher than the annealing temperature of the plate S to be processed (usually around 500 to 800°C). Set to .

For example, in the case of phosphor bronze, this annealing temperature is 500~
600℃, 400-500℃ for brass, and nickel silver
550-700℃, 750-800℃ for beryllium copper.

On the other hand, as shown in FIGS. 4 and 5, the cooling section 2 is hermetically covered as a whole by a housing 29 having a rectangular cross section like the heating section 1, and is transferred from the heating section 1 side. Seal members (not shown) are provided at an inlet 30 through which the heated plate is brought in and an outlet 31 through which it is taken out. Inside this housing 29, there is a
It is filled with a reducing gas such as H ₂ or an inert gas such as N ₂ to create a reducing or inert gas atmosphere. In other words, the plate to be treated, which is made of non-ferrous metal, oxidizes in the air at temperatures above about 100°C and causes discoloration, so it is necessary to prevent oxidation even during cooling, so the inside of the housing is kept in a reducing or inert gas atmosphere. It forms. Therefore, the carrying-out port 19 of the heating section 1 and the carrying-in port 3 of this cooling section 2
0 is connected by a sealed communication path 32, and by filling this with reducing or inert gas, oxidation of the plate transferred into this communication path 32 is prevented.

In the housing 29, there are carbon plates 33, 33 for holding the plate S to be processed, which is transferred through the housing 29, in surface contact with the plate S from above and below, that is, from the thickness direction; A cooling jacket 3 located on the opposite side of the surfaces of the plates 33, 33 that sandwich the plate to be processed.
4 and 34 are sequentially stacked. Here, the thickness of the carbon plates 33, 33 is preferably 5 to 7 mm from the viewpoint of thermal efficiency, as described above. The outer shells of the cooling jackets 34, 34 are made of a material with good thermal conductivity, such as aluminum, and are formed into a long box 35. Inside this box body 35, a large number of baffle plates 36 are arranged alternately in the width direction, and between these baffle plates 36, a meandering pattern is formed along the conveyance direction of the plate to be processed. Refrigerant flow path 3
7 is formed. A refrigerant inlet 38 is formed on the side of the box body 35 on the upstream side in the transport direction of the processing target board, and a refrigerant outlet (not shown) is formed on the downstream side.
The cooling heat of the refrigerant such as water flowing through the cooling jackets 34, 34 directly directs the plate S to be processed, which is being held between the carbon plates 33, 33 in surface contact therewith, through the carbon plates 33, 33. It is now subjected to slow cooling treatment, that is, bright annealing.

Next, the operation of the present invention configured as described above will be explained.

First, a plate to be treated, which has been previously formed into a belt shape with a certain thickness, is wound into a roll in order to be heat treated. For example, a plate having an initial thickness of about 1 to 2 mm is used, and the plate is made to have a thickness of about 0.1 mm by repeating the rolling and heat treatment described below several times.

Then, the belt-shaped roll 9 manufactured as described above is attached to the tension roller 8 of the roll carrying device 4 which constitutes a part of the transport means 3, and the to-be-processed plate S
The leading end of the winding drum 1 of the winding device 6 is passed through the rolling mill 15, the heating section 1, the cooling section 2, etc. in sequence.
Wrap it around 4 and secure it.

When the entire device is operated in such a state, the drive roller 11 of the drive roller box device 5...
rotates in the conveying direction, the plates S to be processed are sequentially unwound from the belt-shaped roller 9, and the entire plate to be processed is transported toward the winding device 6. During this time, the plate S to be processed is first pressed between the work rolls 16a, 16a of the rolling mill 15 from the thickness direction thereof and subjected to a rolling process, thereby causing work hardening. Then, the rolled plate S is introduced into the heating section 1, where the plate S is heat-treated, and in the cooling section 2, bright annealing is sequentially performed on the plate S. S is continuously heat treated.

In the heating section 1, by operating the press member 27 that constitutes a part of the clamping means 25, the housing 17 is elastically applied downward from above to apply a small pressure as appropriate. In this case, the pressure is not so high, and the plate S to be treated and the carbon plates 20, 20
The pressure may be sufficient to bring them into surface contact without forming an atmospheric gas layer between them. As a result, the push plates 2 are stacked at the top and bottom of the housing 17.
A slight pressure is applied between 6 and 26, and the carbon plate 2
The plate S to be processed, which moves between 0 and 20 degrees, slides and is held in surface contact with both carbon plates.

At the same time, the electric heaters 23, 23 are energized via the power supply lines 28, 28, and the heat generated from this is transferred to the uniform steel plates 21, 21 and the carbon plate 2.
0 and 20 to the plate S to be processed and heats it to a high temperature. In this case, since the plate S to be processed is in surface contact with the carbon plates 20, 20, it is directly heated from this, and its thermal efficiency is very good. This temperature should be higher than the annealing temperature of the plate S to be processed, and is usually 500 to 800°C depending on the metal material used.
Set before and after.

For example, this annealing temperature is
500-600℃, 400-500℃ for brass, 550-700℃ for nickel silver, and 550-700℃ for beryllium copper.
The temperature is 750-800℃.

In this case, since the carbon plates 20, 20 are used as members that are in direct contact with the plate S to be processed, the plate S to be processed can easily slide and stable heat treatment can be performed.

In addition, a heat insulating material 2 is provided inside each push plate 26, 26.
4 and 24, the electric heater 2
Heat from 3 and 23 is blocked here, and heat loss leaking to push plates 26 and 26 can be minimized.

In addition, since the plate S to be processed is heated to a high temperature of about 500 to 800°C in this housing 17, it tends to be very easily oxidized, but the inside of this housing 17 and the communicating path 32 connected thereto are
Since the atmosphere is filled with a reducing or inert gas such as H ₂ or N ₂ , the plate S to be processed will not be oxidized.

When replacing the atmosphere inside this housing 17 and the housing 29 of the cooling section (to be described later) with H ₂ at the start of operation, in order to prevent explosions, replace the atmosphere with an inert gas such as CO ₂ before replacing the atmosphere with air. is removed and then this CO ₂ is replaced with H ₂ .
This method is also used to remove H ₂ from the housing during shutdown.

Incidentally, the heating time in the heating section 1 is adjusted by adjusting the rotational speed of the drive rollers 11, that is, the moving speed of the plate S to be processed.

In this way, the heat-treated plate S is carried out from the outlet 19 of the heating section 1, passes through the communication passage 32 filled with a reducing or inert gas atmosphere, and is then introduced into the cooling section 2. , annealed. That is, in this cooling section 2, cooling jackets 3 provided above and below the carbon plates 33, 33
Cold water as a refrigerant is circulated in a meandering manner along the conveyance direction of the plate S to be processed in the carbon plates 33 and 34, and the comparatively high temperature cover slides between the carbon plates 33 and 33 due to its cold heat. Bright annealing is performed by directly cooling the treated plate.

In this case, as in the heating section 1, the plate S to be processed in a high temperature state is in surface contact with the carbon plates 33, 33, so it can be directly cooled by the carbon plates 33, 33, and the cooling efficiency is can be raised.

In this way, since the cooling efficiency can be increased and rapid cooling can be performed, it can meet the needs of beryllium copper, which requires rapid cooling from an annealing temperature of 800° C. or higher to a temperature of 700° C. or lower.

Further, the cooling temperature of the plate S to be processed is adjusted to be 100° C. or less at the outlet 31 of the cooling section 2.
This means that when the temperature of the plate S to be processed becomes 100℃ or less,
This is because it becomes difficult to oxidize. Therefore, since the temperature of the plate S to be processed passing through the cooling section 2 is still 100° C. or higher, there is no reducing or non-reducing material in the housing 29, similar to the heating section 1, for the purpose of preventing oxidation. Fill with active gas atmosphere.

The plates S to be processed as products discharged from the discharge port 31 of the cooling section 2 are sequentially wound up by the winding drum 14 located on the downstream side.

In this case, in order to further reduce the thickness of the plate 1 to be processed wound around the winding drum 14, the same heating and cooling operations as described above are repeated several times to achieve the desired plate thickness, for example 0.1. Approximately mm.

In this way, in this embodiment, the plate to be processed S
Since a carbon plate is used to heat the plate while being in direct surface contact with the plate, the plate S to be treated can be directly heated, increasing thermal efficiency from around 10% to around 50% compared to conventional indirect heating. can be significantly improved.

Therefore, the length of the heating section 1 itself can be correspondingly shortened, and the equipment can be made smaller.

Similarly, in the cooling section 2, the processing target board S
Since the carbon plate is brought into direct surface contact with the carbon plate for slow cooling, the cooling efficiency can be improved and the length of the cooling section can be correspondingly shortened.

In particular, since it has become possible to rapidly cool the plate to be processed by increasing the cooling efficiency, the properties will not deteriorate even when heat treating an alloy that requires rapid cooling, such as beryllium copper.

In addition, since we used carbon with good sliding properties as the member that makes surface contact with the plate to be treated,
Continuous transport of the plate to be processed that comes into contact with this is not impaired.

Incidentally, in the above embodiment, a case has been described in which a normal single non-ferrous metal plate is continuously heat treated, but the present invention is not limited to this, and a cladding treatment in which heating and rolling are performed simultaneously can also be performed.

In other words, on a strip-shaped metal plate that should be the base material,
Thin plates of different metals made of silver or the like to be cladded are stacked one on top of the other to form a plate to be treated as a whole. Then, it is continuously transferred from the heating section 1 to the cooling section 2 and subjected to the same treatment as described above.

That is, in order to carry out the cladding treatment, it is necessary to heat the plate to be treated and at the same time apply a large pressing force to it from the stacking direction. Therefore, the output of the press member 27 constituting the heating section 1 is increased, and the plates to be treated are pressed from the stacking direction with a much greater pressure than during the heat treatment.

In this case, since the press member 27 has elasticity in the vertical direction due to a spring or the like, it allows this sliding movement without firmly holding the plate S to be processed.

In addition, the heating temperature at this time is a temperature at which an intermediate alloy layer can be formed at the joint between the base material of the plate to be treated and the dissimilar metal plate due to the thermal diffusion phenomenon, and a temperature that is lower than the respective melting points of the base material and the dissimilar metal. Set it so that .

Moreover, since the steel uniform plates 21, 21 are interposed on the outside of each carbon plate 20, 20, even if an uneven load is applied from the push plates 26, 26 side, the uniform plates 21, 21, By the action of 21, a uniform load can be applied to the plate S to be processed in a plane.

As described above, according to this embodiment, by significantly increasing the output of the press member 27 of the heating section 1, it is possible to heat the plate S to be processed and apply a large pressing force to it at the same time. can also be produced continuously.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects can be achieved.

(1) Since the plate to be treated is brought into surface contact with the carbon plate and heated while being moved continuously, the plate to be treated can be heated directly.
Compared to the conventional example, thermal efficiency can be significantly improved and power consumption can be reduced.

(2) Therefore, since thermal efficiency can be improved, the length of the heating section can be shortened by a corresponding amount, and the device itself can be downsized and equipment costs can be reduced.

(3) In the cooling section, the plate to be treated is cooled while being continuously moved while in surface contact with the carbon plate, allowing direct cooling and improving cooling efficiency compared to conventional examples. .

(4) Therefore, since the cooling efficiency can be improved, the length of the cooling section can be shortened by a corresponding amount, and together with the above reasons, the entire device can be significantly downsized, and equipment costs can be reduced. can be effectively reduced.

(5) In addition, by increasing the output of the press member in the heating section, it is possible not only to heat the plate to be processed, but also to apply a large pressing force to it while allowing this sliding movement, thereby making it possible to maintain the continuity of the clad plate. manufacturing can be made possible.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a continuous manufacturing apparatus for non-ferrous metal sheets according to the present invention, FIG. 2 is a partially cutaway plan view showing a heating section, FIG. 3 is an enlarged view of section A in FIG. 2, and FIG. FIG. 5 is a longitudinal sectional view showing the cooling section, FIG. 5 is a partially cutaway perspective view showing the internal structure of the cooling section, and FIG. 6 is a schematic plan view showing a conventional continuous manufacturing apparatus for non-ferrous metal sheets. In the figure, 1 is the heating section, 2 is the cooling section, 3 is the transfer means, 17 is the housing of the heating section, 20 is the carbon plate of the heating section, 23 is the electric heater, 25 is the clamping means, and 29 is the housing of the cooling section. , 33 is a carbon plate of the cooling section, and 34 is a cooling jacket.

Claims (1)

[Scope of Claims] 1. In an apparatus for heat treating a rolled non-ferrous metal plate, a heating section that heats the rolled plate for a predetermined period of time while holding the rolled plate between carbon plates in a reducing or inert gas atmosphere. and a cooling section for gradually cooling the heat-treated plate carried out from the heating section by directly contacting it with a refrigerant while sandwiching it between carbon plates in a reducing or inert gas atmosphere. A continuous heat treatment device for non-ferrous metal plates, characterized by: 2. Claim 1, characterized in that the heating section and the cooling section are connected in series, and further comprising a transfer means for continuously transferring the plate to be processed from the heating section to the cooling section. Continuous heat treatment equipment for non-ferrous metal plates as described in 2. 3. A housing in which the heating section is maintained in a reducing or inert gas atmosphere, a carbon plate for holding the plate to be processed while being in surface contact with the plate being transferred through the housing, and the carbon plate. Claim 1, characterized in that it has an electric heater laminated on the opposite side of the surface in contact with the plate to be processed, and a holding means for holding the plate to be processed by the carbon plate with appropriate pressure. term or second
Continuous heat treatment equipment for non-ferrous metal plates as described in 2. 4. The cooling section includes a housing maintained in a reducing or inert gas atmosphere, a carbon plate for holding the processed plate transferred through the housing, and the processed plate of the carbon plate. and a cooling jacket laminated on the opposite side of the clamping surface.
3. The continuous heat treatment apparatus for nonferrous metal plates according to any one of Items 1, 2, and 3.