JP4437893B2 - Heating and pressing method of workpiece by double belt machine and the same belt machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a workpiece is supplied between a pair of upper and lower endless belts made of metal, preferably stainless steel, and the workpiece is particularly heated while being continuously transferred between the endless belts. The present invention relates to a method for heating and pressing a workpiece by a double belt machine having a pressed area and performing various continuous processes on the workpiece on the endless belt, and the double belt machine.
[0002]
[Prior art]
In recent years, various products have been processed and manufactured using metal endless belts. These machines for processing and manufacturing are often simply referred to as belt machines. The advantage of this belt machine is that a variety of processing can be performed continuously on the same belt under various conditions for the workpiece, it can always be processed on a flat surface, There may be no tension until you leave the belt. There are various types of belt machines, such as a film forming machine that directly manufactures a film while pouring molten resin on the belt, or a coating machine that coats a thin film on the surface of a sheet product that is also conveyed on the belt. is there. These belt machines typically use a single metal endless belt, a single belt machine that performs desired processing on the workpiece on the belt, and upper and lower metal endless belts. There are mainly two types, a double belt machine that performs various types of processing on the workpiece.
[0003]
As an example of the single belt machine, there is a belt machine disclosed in Patent Document 1, for example. This single belt machine is a dripping machine for forming fluid chemical products into particles. This dripping machine rotates a rotating screen having an internal chamber in which a fluid chemical product is accommodated under atmospheric pressure, and collides the fluid chemical product with a pressure member in the chamber to generate a fluid pressure. Then, a fluid chemical product is extruded through the opening of the screen to form a drip, and is dropped onto the conveying surface of a metal endless belt running on one side. The drip dropped on the transport surface is transported and solidified into particles, which are taken out and collected. As this particle | grain, it is a particle | grain which consists of chemical products, such as a chemical | medical agent, a seasoning, a fragrance | flavor, a synthetic detergent, a resin stabilizer, for example.
[0004]
On the other hand, the double belt machine continuously performs various processes such as heating / cooling, reaction, pressurization / lamination, and mirror transfer while transporting between the upper and lower belts that run the workpiece. Board, rubber, composite sheet or board heat treatment equipment, resin coating equipment for the printed circuit board surface, mass production equipment for bonded products with metal and rubber, laminating equipment for flexible substrates specially processed at high temperatures, etc. Can be mentioned. For example, according to Patent Document 2, a metal W endlessly arranged with a workpiece W in which an inlet sheet having an IC chip mounted on a coil antenna is disposed between card bases and traveling in the opposite belt region in one direction. A double belt machine is disclosed that manufactures a resin card with a built-in IC chip by sandwiching it with a belt, heating it with a heating / pressurizing device, and then applying pressure and cooling.
[0005]
As another example of this double belt machine, for example, in Patent Document 3, two or more pairs of metal endless belts traveling in the same direction and at the same speed are installed in series, and the unfoamed resin sheet is placed in the above-described manner. There is disclosed a method for continuously producing a foam sheet having uniform bubbles while being clamped and transported by a pair of belts. In this method, at least both sides of the foamed sheet transferred by being pressed by the endless belts of the first group and the second group are controlled to a temperature equal to or lower than the melting point of the resin used. The second set of endless belts is advanced at a speed 5 to 1000% higher than that of the first set, and the third and subsequent sets of endless belts are advanced at substantially the same speed as the immediately preceding set of endless belts. The temperature of the inlet-side sheet pressing belt portion and the temperature of the outlet-side sheet pressing belt portion in the first and second endless belts are controlled respectively, and the third and subsequent endless belts are controlled. Is controlled to a predetermined temperature.
[0006]
[Patent Document 1]
JP-A-11-276877 [Patent Document 2]
Japanese Patent Laid-Open No. 11-338997 [Patent Document 3]
Japanese Patent Laid-Open No. 8-156119
[Problems to be solved by the invention]
The endless belt made of metal as described above is usually as thick as (0.6 to 3 mm) and the length is often over 8 m. Moreover, this type of belt machine is characterized by the fact that various processes such as heating, cooling and heating and pressing can be continuously performed on the same belt as described above, so depending on the product to be processed, the belt itself The temperature must be uniformly raised to 400 ° C. or higher and simultaneously pressurized at a high pressure, and immediately after that, it must be cooled to 50 to 60 ° C. with a temperature change close to a stepped shape.
[0008]
In general heating and pressing rolls, a heating / cooling medium jacket is simply formed inside, and the heating / cooling medium is passed through the jacket to heat or cool the surface of the heating / pressing roll. is doing. However, in the heating roll in which the heating medium is flowed, the roll surface temperature can be raised only to about 300 ° C., and the temperature distribution in the roll axis direction at the time of temperature rise is influenced by the flow of the heating medium. It is very difficult to homogenize.
[0009]
Aside from the normal processing field where variations in temperature distribution on the roll surface are widely accepted, for example, when the resin is coated on the surface of a printed circuit board as described above, or between metal foil and rubber or film In the processing field that requires high-precision temperature management and pressure management, such as laminating for flexible substrates that require bonding or high pressure of 400 ° C. or higher and high pressure of 490 N / cm or higher, for example, processing under temperature conditions Even if this is possible, if slight variations occur in the temperature distribution and pressure distribution, the characteristics of the manufactured products often vary, and the yield is greatly reduced.
[0010]
In addition, as described above, a belt machine that uses a metal endless belt and can perform various processes continuously, even if a high temperature region and a low temperature region exist in the belt traveling direction, the belt always travels. Therefore, unlike a normal roll machine that directly heats and cools the work piece with a heating / cooling roll, a cooling roll is placed immediately after the high temperature range and heat transfer from the belt is used to make a staircase shape. The temperature of the workpiece can be changed to a low temperature range with a change close to.
[0011]
However, in order to uniformly heat the temperature distribution in the belt width direction with high accuracy in a high temperature range, it is extremely difficult to apply uniform heating by applying a heating roll using a heating medium because of the influence of the flow of the heating medium as described above. Of course, it is difficult to heat above 400 ° C., considering that the continuous stability of the heating medium above 300 ° C. is difficult.
[0012]
As described above, this type of double belt machine includes, for example, a film continuous device and various laminators. In order to operate these machines, it is necessary to control the pressure gap between the upper and lower endless belts with high accuracy in the belt width direction. It cannot be said that it is sufficient to simply increase the flatness of the belt, and the smoothness of the roll surface pressing the belt should not vary in the axial direction as well as in the circumferential direction. On the other hand, in the roll structure in which the heating medium just flows as described above, it is difficult to control the temperature distribution on the surface of the roll under high temperature with high accuracy, so the amount of thermal expansion of the roll varies depending on the temperature distribution. A difference in outer circumference is likely to occur in the roll axis direction.
[0013]
In addition, when a metal endless belt runs on a rotating heated roll surface under high temperature and pressure, the belt running surface of the roll, in particular, the edge portion of the belt is easy to bite into the roll surface, and the streaks are continuous in the circumferential direction on the circumferential surface of the roll. It is easy to be bitten and scratched. This flaw greatly affects the processing accuracy of the processed product.
[0014]
As described above, machining of workpieces by a double belt machine is strongly required to continuously process a plurality of processes with high accuracy under severe machining conditions. However, in the conventional processing by this type of double belt machine, a heating roll by simply flowing a heat medium used in a general roll machine is used, particularly in the heating and pressurizing section, and the inside of the roll flows. It is difficult to make the temperature of the heat medium uniform in the flow direction, and in particular, it is impossible to eliminate temperature variations in the roll axis direction. In addition, the roll surface temperature cannot be set to a high temperature of 300 ° C. or higher, and it is impossible to cope with the case where such high temperature processing is necessary.
[0015]
Therefore, the present inventors have a double belt machine having many advantages, and as a result of repeating various experiments on the heating and pressurizing means that cannot make full use of the advantages, the roll alone has conventionally been applied to various fields. In spite of this, we have found that all the above-mentioned problems can be solved by applying induction heating rolls that have never been used in double belt machines.
[0016]
The present invention has been made to solve various problems peculiar to such a belt machine, and its specific purpose is to make a required high temperature highly uniform in the belt width direction, and to make a belt running at a low temperature. The temperature can be raised to 400 ° C or higher, and the surface of the heating roll can be smoothed uniformly, and the heating roll can be uniformly heated and pressed against the workpiece without being damaged by the edge of the metal endless belt. An object of the present invention is to provide a double belt machine capable of effectively carrying out the same heating and pressurizing method as the heating and pressurizing method by a double belt machine.
[0017]
[Means for solving the problems and effects]
In order to achieve the above object, the basic configuration of the method of the present invention is to drive and rotate a pair of upper and lower metal endless belts in the same direction in the facing belt region, and in the facing belt region, work is performed between the facing belts. A continuous supply of materials to be transferred in the same direction, and during this transfer, each belt is pressed in the facing direction with an induction heating roll in the facing belt region and simultaneously heated to 400 ° C. or higher, the induction The surface of the heating roll has a layer with a hardness of Hv 800 to 1000, and the hardening roll is hardened to a depth of at least 1.5 mm from the surface of the base material of the induction heating roll to a hardness of Hs 57 to 80. This is a method for heating and pressing a workpiece by a double belt machine.
[0018]
This induction heating roll is often used as a roll machine for processing by directly wrapping or directly contacting a processed product on a roll, for example, a drawing roll such as a film or spinning, or various calendar rolls or coating rolls. Many of the objects to be processed are made of a material excellent in flexibility and flexibility, and are processed products that do not greatly affect the physical properties of the material even when processed while being bent by applying tension.
[0019]
On the other hand, this type of belt machine including a double belt machine is made of a metal plate made of a stainless steel plate having a thickness of 0.6 to 3 mm without directly contacting a heated roll with a workpiece. It is heated via an endless belt. In addition, since the processing accuracy does not affect the characteristics of the product, extremely high accuracy is often required. As a result, since the metal belt surface and the roll surface may be damaged due to rotation while being brought into contact with the metal endless belt, it is assumed that an induction heating roll is adopted as the heating roll in the belt machine. It is thought that there was not.
[0020]
Of course, in order to apply the induction heating roll to the belt machine, it was necessary to make improvements as described later. However, as a result of various experiments, the induction heating roll was basically adopted, so that the conventional heating roll Various problems that were not achieved were solved at once. That is, if an induction heating roll is used as in the present invention, the temperature distribution on the roll surface in the roll axial direction can be made highly uniform, and the belt temperature by the induction heating can be easily raised to 400 ° C. or higher. . Furthermore, the difference in the outer circumference in the roll axis direction that occurs during the heating and pressing process can be easily corrected by controlling the arrangement of the induction coil and the input voltage for each coil.
[0021]
In general belt machines, metal endless belts are used as described above. For this reason, the surface hardness of ordinary induction heating rolls is too low, and therefore, streaky biting scratches may occur due to friction between the endless belt and the roll at high temperature and high pressure, or particularly in the contact area between the belt edge and the roll. Cheap. The occurrence of these scratches has a fatal effect in the field where high-precision machining is required. Therefore, in the method of the present invention, it is preferable to use an induction heating roll having a surface having a hardness of Hv 800 to 1000 on the surface of the induction heating roll. If it is lower than Hv800, the aforementioned scratches are likely to occur. Hard chromium plating etc. are mentioned to make hardness Hv of the surface of an induction heating roll into 800-1000.
[0022]
Furthermore, in the method of the present invention, it is desirable to perform a curing process over a depth of at least 1.5 mm from the surface of the base material of the induction heating roll to a hardness of Hs 57-80. During processing by the belt machine, fine dust may enter between the heating and pressing roll and the belt. For example, chrome plating is applied to the surface of a normal induction heating roll. However, in the case of mere chrome plating or the like, a minute recess is formed by biting into the roll surface due to the entry of minute dust as described above. Examination of the recesses revealed that the roll base material itself was recessed along with the plating layer. Such fine recesses on the roll surface can also have a significant effect on the temperature distribution of the belt. In order to avoid this, it is preferable to increase the surface hardness of the base material of the roll itself. If the hardness is particularly Hs57 or higher, the occurrence of recesses as described above can be prevented. Examples of the curing treatment for Hs57 to 80 include induction hardening.
[0023]
The heating and pressurizing method in the above-described double belt machine is effectively carried out by a double belt machine having the following basic configuration.
That is, the double belt machine according to the present invention is arranged so as to face the inner facing belt region of the metal endless belt, which is arranged in a pair in the upper and lower directions and whose facing belt region is driven in the same direction, and the upper and lower endless belts. And one or more induction heating rolls capable of pressing each belt in a facing direction and capable of heating to 400 ° C. or more, the induction heating roll having a base material surface having a layer of hardness Hv 800 to 1000, It is characterized by having a hardness of Hs 57-80 from the surface of the base material to a depth of at least 1.5 mm.
[0024]
The induction heating roll is usually chrome-plated on the roll surface as described above. However, since the hardness is low when the chrome plating is simple, various problems as described above occur. . In general, the induction heating roll has an induction heating coil at the center of the base material of the roll, and has a heat medium jacket so as to surround the induction heating coil. It is desirable for the same reason as described above that the hardness of the surrounding portion of the heat medium jacket is Hs57 or more.
[0025]
In the present invention, the Hv hardness measurement method is a method defined in JIS Z2244, and the Hs hardness measurement method is a method defined in JIS Z2246.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, representative embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a metal foil laminating apparatus which is an embodiment of the double belt machine of the present invention. According to this embodiment, a pair of metal endless belts 1 and 2 are arranged on the upper and lower sides, and each of these endless belts 1 and 2 is provided with a pair of front and rear drive rolls 3 and 4 and a follower installed on a frame (not shown). It is wound around each of the rolls 5 and 6. In the present embodiment, the drive rolls 3 and 4 disposed above and below are driven synchronously by a single drive motor 7 via a chain 8, and both belts 1 and 2 are opposed in the facing region of the upper and lower endless belts 1 and 2. 2 are traveling in the same direction.
[0027]
A plurality (three in the illustrated example) of freely rotating guide rolls 9 are fixed to the upper endless belt 1, and a tension roll 10 for adjusting the tension of the endless belt 1 to a required tension is disposed. . The tension roll 10 is moved between a tension applying position and a standby position by a cylinder 11. The driven roll 5 of the upper endless belt 1 can be reciprocated in the vertical direction between the machining position and the standby position by the cylinder 12. Further, the driven roll 5 incorporates a heating means (not shown) so that the workpiece W can be preheated.
[0028]
One lower endless belt 2 is also provided with a plurality of (two in the illustrated example) guide rolls 13 that freely rotate. According to the present embodiment, the tension of the lower endless belt 2 is adjusted by reciprocating in the horizontal direction by a cylinder (not shown). Similarly to the upper driven roll 5, the lower driven roll 6 also includes heating means (not shown), and preliminarily heats the workpiece W to be supplied.
[0029]
The pair of upper and lower drive rolls 3 and 4 are directly connected to the drive motor 7 via a reduction gear (not shown) to the lower drive roll 4, and a chain wheel 14 disposed on the rotation shaft of the drive roll 4, The upper drive roll 3 is synchronously driven via a chain wheel 15 disposed on the rotation shaft of the upper drive roll 3 and first and second auxiliary chain wheels 16 and 17. The drive motor 7 is typically a servo motor by inverter control, for example. Also, when using a reducer, a cyclo-type or coronet-type reducer is usually used, but if you don't like the gear mark caused by the backlash of the reducer, use a planetary roller reducer. Is preferred.
[0030]
In the metal foil laminating apparatus according to the present embodiment, the raw material W of the metal foil which is a workpiece is introduced from the upper and lower driven rolls 5 and 6 side, and is sent out from the upper and lower drive rolls 3 and 4 side. In this facing belt region, the raw material W is 400 ° C. via the endless belts 1 and 2 while being transported linearly in a state of being sandwiched between upper and lower endless belts 1 and 2 that are driven and rotated in one direction. After heating and pressurizing at a high pressure of 784 N / cm under the high temperature of the above, the sheet is cooled to 30 ° C. and continuously rolled to produce a thin sheet of metal foil laminate.
[0031]
According to the illustrated example, the upper and lower endless belts 1 and 2 adjacent to the downstream side of the guide roll 9 of the upper endless belt 1 arranged on the downstream side of the upper driven roll 5 are provided with hot air jets (not shown). A hot air chamber 18a facing the belt inner surface of the endless belts 1 and 2 running in the facing belt region at the outlet is provided. The hot air chamber 18a is of a hot air circulation type, and the heated air sent from the fan 18b is heated to a specified temperature by a heater (not shown) in the heating unit 18c, and sent to the hot air chamber 18a through a filter (not shown). The heated air is jetted from a jet port (not shown) of the hot air chamber to the inner surface of the belt running in the facing belt region of the upper and lower endless belts 1 and 2 and heats the raw material W to 350 ° C. or more via the belts 1 and 2. The jetted heated air is circulated back from the discharge port (not shown) of the hot air chamber 18a to the fan 18b through a pipe. Dampers 18d and 18e for adjusting the heated air volume are respectively attached to a pipe for sending the heated air to the hot air chamber 18a and a pipe for returning the heated air from the hot air chamber 18a to the fan 18b.
[0032]
Further, in the present embodiment, a large number of heating and pressing rolls 19 are arranged facing the inside of the upper and lower endless belts 1 and 2 adjacent to the downstream side of the hot air chamber 18a. An induction heating roll which is a characteristic part of the present invention is used for the heating and pressing roll 19. Among the induction heating rolls 19, the induction heating rolls 19 arranged inside the lower endless belt 2 are individually separated by cylinders 20. The pressurizing force (roll gap) can be adjusted. The gap between the upper and lower belts 1 and 2 is set in accordance with a preset thickness of the metal plate, and the distance between the induction heating rolls 19 facing each other by the cylinders 20 is considered in consideration of the belt thickness. It is strictly controlled.
[0033]
The induction heating roll 19 has a structure schematically shown in FIG. The structure will be briefly described. The roll body 19a is hollow, and an induction coil 19b connected to an external power source (not shown) is disposed therein. The roll body 19a is formed with a cylindrical heat medium jacket 19c on the circumference having the same axis, and the jacket 19c is filled with a heat medium such as naphthalene, for example, at 400 ° C. or higher. Heating is possible. The upper limit of the heating temperature of the belt by the induction heating roll 19 can be raised to 600 ° C., and it is possible to raise the temperature so as not to be compared with a simple heating roll using a conventional fluid heat medium. The rigidity is sufficient to withstand the pressure of 784 N / cm at the maximum.
[0034]
Further, the jacketed induction heating roll 19 uniformly heats the roll itself with a desired calorific value by controlling the input voltage, and the heat medium enclosed in the jacket 19c formed on the roll body 19a is also uniform. Since it is heated, a stable roll surface temperature uniformized with high accuracy can be obtained. Further, by increasing the number of induction coils and adjusting the arrangement thereof, a highly accurate outer diameter shape with respect to the roll surface can be obtained even under severe conditions of high temperature and high pressure.
[0035]
Now, a normal induction heating roll is subjected to hard chrome plating having a surface hardness of about Hv800 on the surface thereof. However, even if it is hard plating, if the hardness of the base material of the roll body 19a is low, during operation of the double belt machine, for example, between the endless belts 1 and 2 made of stainless steel and each induction heating roll 19 Minute dust may enter. At this time, if the hardness of the roll base material is lower than the hardness of the belt, dust that has entered through the chrome plating bites in and deforms the roll base material. In order to avoid this, it is necessary to increase the hardness of the roll base material itself. Therefore, in the present embodiment, it is preferable that the surface of the roll base material is preliminarily hardened by induction hardening or nitriding to increase the hardness, and the hardness Hs at this time is preferably 57-80. .
[0036]
In addition, it is preferable that the depth range of the hardening process is 1.5 mm or more. If the depth is too shallow, it may lose the stress at the time of dust biting, and a concave portion may be formed as usual. In this embodiment, the roll body 19a (thickness 2 mm) surrounding the jacket 19c is induction-hardened so that the hardness Hs is 57-80.
[0037]
Now, using the induction heating roll 19 having the above configuration, two copper raw materials W (between the upper and lower metal endless belts 1 and 2 and transferred at a transfer speed (1 m / min)) ( A heat-resistant film (width 280 mm and thickness 100 μm) is placed between the shape of the raw material, width 300 mm and thickness 35 μm, and heated to 400 ° C., and pressure treatment is performed between the belts 1 and 2 with a pressure of 490 N / cm. Next, final heating and pressing are performed through a plurality of heating and pressing rolls 21 using a conventional fluidized heat medium that has been conventionally used, and a metal foil laminate having a desired peeling strength is continuously formed. Manufactured. The heating temperature of the heating and pressing roll 21 was 280 ° C., and the pressure was set to 784 N / cm.
[0038]
Despite such harsh processing conditions, the upper and lower endless belts 1 and 2 and each induction heating roll 19 are not damaged even for long-term use, and are of high quality with uniform peeling strength throughout. Metal foil laminates could be manufactured continuously.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration example of a double belt machine which is a representative embodiment of the present invention.
FIG. 2 is a cross-sectional view of an induction heating roll.
[Explanation of symbols]
1, 2 Upper and lower metal endless belts 3, 4 Upper and lower belt drive rolls 5, 6 Upper and lower driven rolls 7 Drive motor 8 Chain 9, 13 Guide roll 10 Tension rolls 11, 12 Cylinders 14, 15 Chain wheels 16, 17 Auxiliary Chain wheel 18a Hot air chamber 18b 1st fan 18c Heating part 18d, 18e Damper 19 for heating air volume adjustment Induction heating roll (heating pressurization roll)
19a Roll body 19b Inductive coil 19c Heat medium jacket 20 Cylinder 21 Heating (cooling) Pressurizing roll W Work piece (raw material of copper thin plate)

Claims (3)

Driving and rotating a pair of upper and lower metal endless belts in the same direction in the facing belt region;
In the facing belt region, continuously supplying a workpiece between the facing belts and transferring it in the same direction;
During this transfer, each belt is pressed in the facing direction with an induction heating roll in the facing belt region, and at the same time, heated to 400 ° C. or higher ,
The surface of the induction heating roll has a layer of hardness Hv 800-1000, and
Carrying out a curing treatment over a depth of at least 1.5 mm from the surface of the base material of the induction heating roll to give a hardness of Hs57-80,
A method for heating and pressing a workpiece by a double belt machine, comprising: A metal endless belt which is arranged in a pair on the top and bottom and is driven in the same direction in the facing belt region;
One or more induction heating rolls arranged opposite to the inner facing belt region of each of the upper and lower endless belts, capable of pressing each belt in the facing direction and capable of heating to 400 ° C. or higher ,
The induction heating roll has a layer having a hardness of Hv 800 to 1000 on the surface of the base material, and a hardness of Hs 57 to 80 from the surface of the base material to a depth of at least 1.5 mm. machine. The induction heating roll has a hard plating film on the surface of the base material, an induction heating coil in the center of the base material of the roll, and a heat medium jacket so as to surround the induction heating coil. The double belt machine according to claim 2, wherein at least the surrounding region of the heating medium jacket of the roll has a hardness of Hs57 or more.

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