Constant temperature forging device and constant temperature forging method
Patent Information
- Application Number
- JP2022115993
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2022-07-21
- Publication Date
- 2025-04-03
- Estimated Expiration
- 2042-07-21
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to an isothermal forging apparatus and method for clamping and processing a workpiece at a high temperature in an inert gas atmosphere. [Background technology]
[0002] Forged products made from high-strength alloys and high-heat-resistant alloys are used in aircraft engine components, which require high quality. In response to demands for improved fuel efficiency and reduced environmental impact in aircraft, the Ni-base super heat-resistant alloys used in the high-temperature turbine disks of aircraft engines are required to be able to withstand higher temperatures and have higher strength. Currently, turbine disks are processed and formed by isothermal forging (forging in which the workpiece and the die are controlled to the same temperature) (see Patent Document 1).
[0003] As an example of a constant temperature forging device, which is a constant temperature processing device, it will be described using the same names and the same reference numerals as those described in the specification and the attached drawings of Patent Document 1. Fig. 4 is a cross-sectional view of the configuration of a conventional constant temperature forging device. In the figure, within the occupied space of a chamber 1, an upper die 4, which is an upper pressing member, is fixed to the lower side of an upper base 2, and a lower die 6, which is a lower pressing material, is fixed to the upper side of a lower base 5. When the upper die 4 rises, a heated material M, which is a material to be processed, is carried in between the upper die 4 and the lower die 6, and the upper die 4 is lowered to forge the heated material M.
[0004] When manufacturing a forged product by forging the heating material M, the heating material M is heated by heating coils 7a, 7b arranged to surround the upper die 4 and the lower die 6. The heating coils 7a, 7b are guided by upright supports (not shown) to move up and down and uniformly heat the heating material M. In order to prevent oxidation of the upper die 4, the lower die 6, etc., a part or the whole of this constant temperature forging device is heated, for example, under an inert gas atmosphere. However, since the space occupied by the chamber 1 is large compared to the heating material M, there was a problem that a huge amount of inert gas was used.
[0005] Patent Document 2 discloses a pressure device for diffusion welding, and also proposes a structure in which the inside of a cylindrical cover member 50 disposed so as to surround the outside of a heating element 19 is filled with an inert gas to prevent oxidation of the upper and lower forging dies 9, 10, etc. However, since the cylindrical cover member 50 occupies a large space, there is a problem in that a huge amount of inert gas is used. Patent Document 3 discloses a forging device in which a welded body 4 is joined by diffusion welding using a heater 5 inside a welding chamber 7. The inside of the welding chamber 7 is filled with a welding atmosphere such as a vacuum or an inert gas. However, since the space occupied by the welding chamber 7 is large compared to the welded body 4, there is a problem in that a huge amount of inert gas is used. [Prior art documents] [Patent documents]
[0006] [Patent Document 1] Japanese Patent Application Publication No. 7-39983 [Patent Document 2] Special Publication No. 55-23696 [Patent Document 3] Special Publication No. 56-45711 Summary of the Invention [Problem to be solved by the invention]
[0007] As mentioned above, with the recent development of ultra-heat resistant steels with improved high-temperature strength, there is a demand for isothermal forging at temperatures exceeding 1000°C in these processing and forming processes, and isothermal forging using dies that can withstand high temperatures is now necessary. In particular, Mo alloy dies maintain sufficient strength even at high temperatures (1000 to 1100°C), and are one of the dies useful for isothermal forging at high temperatures. However, Mo alloy dies have extremely poor resistance to high-temperature oxidation, so isothermal forging using these dies must be performed in a vacuum or inert gas, and the conventional device described in Patent Document 1 requires a vacuum chamber. Forging devices equipped with vacuum chambers have the problem of being complicated (expensive) and significantly reducing work efficiency.
[0008] The present invention is devised to solve such problems, and has an object to provide an isothermal forging apparatus and an isothermal forging method that can easily perform isothermal forging in an inert gas. [Means for solving the problem]
[0009] [1] The constant temperature forging device of the present invention, as shown in FIG. 1, includes an upper press member 4 and a lower press member 6 for clamping and processing a workpiece W, an upper heater 7a arranged so as to be movable in the vertical direction along the outer peripheral wall side of the upper press member 4, a lower heater 7b arranged so as to be movable in the vertical direction along the outer peripheral wall side of the lower press member 6, an upper surrounding plate 11a arranged on the outer peripheral wall side of the upper heater 7a, a lower surrounding plate 11b arranged on the outer peripheral wall side of the lower heater 7b, a movable mold pressing part 2 fixed to the upper press member 4, a mold receiving stand 5 fixed to the lower press member 6, an upper heat-resistant bellows part 12a connecting the movable mold pressing part 2 and the upper surrounding plate 11a, and a lower heat-resistant bellows part 12b connecting the mold receiving stand 5 and the lower surrounding plate 11b. An upper mold heating furnace 1a including an upper heat-resistant bellows portion 12a, a movable mold pressing portion 2, and an upper surrounding plate 11a, and a lower mold heating furnace 1b including a lower heat-resistant bellows portion 12b, a mold receiving stand 5, and a lower surrounding plate 11b form an openable and closable chamber 1 filled with an inert gas, When the chamber 1 is in an open state, the workpiece W can be inserted and removed between the upper pressing member 4 and the lower pressing member 6, and when the chamber 1 is in a closed state, the workpiece W is clamped between the upper pressing member 4 and the lower pressing member 6, and in this clamped state, a predetermined high temperature state is maintained by the upper heater 7a and the lower heater 7b.
[0010] [2] The constant temperature forging apparatus [1] of the present invention is preferably provided with at least one of an upper inert gas ejection hole 10a provided on the movable die pressing section 2 side of the gap formed between the upper heater 7a and the upper pressing member 4, and a lower inert gas ejection hole 10b provided on the die receiving table 5 side of the gap formed between the lower heater 7b and the lower pressing member 6, and is configured to supply inert gas from at least one of the upper inert gas ejection hole 10a and the lower inert gas ejection hole 10b when the chamber 1 is closed. [3] In the constant temperature forging apparatus [1] or [2] of the present invention, it is preferable to further include an oxygen concentration sensor 15 for measuring the oxygen concentration inside the chamber 1 when the chamber 1 is closed, and to be configured so that the upper and lower pressing members 4 and 6 start clamping the workpiece W only when the oxygen concentration inside the chamber 1 measured by the oxygen concentration sensor 15 falls below a predetermined reference value. [4] In the constant temperature forging apparatus [1] to [3] of the present invention, it is preferable to further provide a gasket 13 for preventing the inert gas from leaking to the outside from the contact surface between the upper surrounding plate 11a and the lower surrounding plate 11b when the chamber 1 is closed.
[0011] [5] In the isothermal forging method of the present invention, as shown in FIG. 2, for example, the upper heater 7a heats the clamping surface of the upper press member 4 on the side of the lower press member 6 to a predetermined temperature determined based on the processing temperature of the workpiece W (S200), the lower heater 7b heats the clamping surface of the lower press member 6 on the side of the upper press member 4 to the predetermined temperature (S205), the chamber 1 is opened and the workpiece W is placed at a predetermined processing position between the upper press member 4 and the lower press member 6 (S210), the chamber 1 is closed and an inert gas is supplied into the chamber 1 (S215), and the chamber 1 is heated. The method is characterized in that it is determined whether the oxygen concentration inside chamber 1 is equal to or lower than a predetermined value (S220), and if it exceeds the predetermined value, the supply of the inert gas is continued (S215), and after the oxygen concentration inside chamber 1 is equal to or lower than the predetermined value, the power supplied to upper heater 7a and lower heater 7b is increased (S225), it is determined whether the temperature of the workpiece W has reached a target temperature (S230), and after the target temperature is reached, the workpiece W is processed (S235), and after the workpiece W has been processed, chamber 1 is opened and the workpiece W is removed from the predetermined processing position (S240).
[0012] [6] The constant temperature forging device of the present invention is, for example, as shown in FIG. 3, an upper press member 4 and a lower press member 6 for clamping and processing a workpiece W, an upper heater 7a arranged to be movable in the vertical direction along the outer peripheral wall side of the upper press member 4, a lower heater 7b arranged along the outer peripheral wall side of the lower press member 6, an upper surrounding plate 11a arranged on the outer peripheral wall side of the upper heater 7a, a lower surrounding plate 11b arranged on the outer peripheral wall side of the lower heater 7b, a movable die pressing part 2 fixed to the upper press member 4, a die receiving stand 5 fixed to the lower press member 6, and an upper heat-resistant bellows part 12a connecting the movable die pressing part 2 and the upper surrounding plate 11a. The upper mold heating furnace 1a including the upper heat-resistant bellows portion 12a, the movable mold pressing portion 2, and the upper surrounding plate 11a, and the lower mold heating furnace 1b including the mold receiving base 5 and the lower surrounding plate 11b form an openable and closable chamber 1 filled with an inert gas, When the chamber 1 is in an open state, the workpiece W can be inserted and removed between the upper pressing member 4 and the lower pressing member 6, and when the chamber 1 is in a closed state, the workpiece W is clamped between the upper pressing member 4 and the lower pressing member 6, and in this clamped state, a predetermined high temperature state is maintained by the upper heater 7a and the lower heater 7b. Effect of the Invention
[0013] The isothermal forging device of the present invention makes it possible to carry out isothermal forging using a Mo alloy die at high temperatures without using a vacuum chamber. By controlling the atmosphere, forging can be carried out in an environment with a significantly reduced oxygen concentration, and even a Mo alloy die with poor oxidation resistance can be used for a long time at high temperatures. [Brief description of the drawings]
[0014] [Figure 1A] 1 is a cross-sectional view of a configuration of a constant temperature forging device according to an embodiment of the present invention, showing a state in which a chamber is closed. [Figure 1B] 1 is a cross-sectional view of a configuration of a constant temperature forging device according to an embodiment of the present invention, showing a chamber in an open state. [Figure 1C] FIG. 2 is a perspective view showing an example of a ring-shaped body having inert gas ejection holes. [Diagram 2] 1 is a flowchart showing an embodiment of a constant temperature forging method of the present invention. [Figure 3A] FIG. 4 is a cross-sectional view of the configuration of a constant temperature forging device according to another embodiment of the present invention, showing a state in which the chamber is closed. [Figure 3B] FIG. 11 is a cross-sectional view of the configuration of a constant temperature forging device according to another embodiment of the present invention, showing the chamber in an open state. [Figure 4] FIG. 1 is a cross-sectional view of a conventional constant temperature forging device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] The best mode for carrying out the present invention will now be described in detail. FIG. 1 is a cross-sectional view of the configuration of a constant temperature forging device according to one embodiment of the present invention, in which (A) shows a state in which the chamber is closed, and (B) shows a state in which the chamber is open. In the figure, chamber 1 is an openable space into which inert gas can be poured, and when closed, it is composed of upper mold heating furnace 1a and lower mold heating furnace 1b. Upper mold heating furnace 1a is composed of upper heat-resistant bellows part 12a, movable mold pressing part 2, upper surrounding plate 11a, and upper heater 7a. Lower mold heating furnace 1b is composed of lower heat-resistant bellows part 12b, mold receiving stand 5, lower surrounding plate 11b, and lower heater 7b.
[0016] The movable mold pressing part 2 has a pressing member 4 fixed thereto, and is provided with a mechanism (not shown) for moving the pressing member 4 up and down within the chamber 1. The upper pressing member 4, together with the lower pressing member 6, clamps and processes the workpiece W. The upper heater 7a is provided so as to be movable in the vertical direction along the outer peripheral wall side of the upper pressing member 4, and for example, an electric heating coil is used. The upper surrounding plate 11a is provided on the outer peripheral wall side of the upper heater 7a so as to move together with the upper and lower movement of the upper heater 7a, and is made of a heat-resistant material that can withstand high temperatures of, for example, about 1000°C. The upper heat-resistant bellows part 12a connects the movable mold pressing part 2 and the upper surrounding plate 11a, and may be a multi-layered fabric made of a heat-resistant material that can withstand high temperatures of, for example, about 400°C to 1000°C, and has airtightness to the extent that it can prevent the inert gas in the chamber 1 from leaking to the outside. The upper inert gas ejection hole 10a is provided on the movable mold pressing part 2 side of the gap formed between the upper heater 7a and the upper pressing member 4.
[0017] The mold receiving table 5 has the lower pressing member 6 fixed thereto. The lower heater 7b is provided so as to be movable in the vertical direction along the outer peripheral wall side of the lower pressing member 6, and for example, an electric heating coil is used. The lower surrounding plate 11b is provided on the outer peripheral wall side of the lower heater 7b so as to move together with the vertical movement of the lower heater 7b, and is made of a heat-resistant material that can withstand high temperatures of, for example, about 1000°C. The lower heat-resistant bellows portion 12b connects the mold receiving table 5 and the lower surrounding plate 11b, and may be made of a multi-layered fabric made of a heat-resistant material that can withstand high temperatures of, for example, about 400°C to 1000°C, and has airtightness to such an extent that the inert gas in the chamber 1 is prevented from leaking to the outside.
[0018] The upper heat-resistant bellows portion 12a and the lower heat-resistant bellows portion 12b may be made of, for example, a flame-retardant fabric made of meta-aramid fiber in the outer layer, and a non-flammable fabric made of a composite material of aluminum foil and glass fiber in the inner layer. For example, Teijin's Conex (registered trademark) or DuPont's Nomex (registered trademark) may be used as the meta-aramid fiber. For the non-flammable fabric, Gentex (registered trademark) made by Gentex may be used. Gentex is a multi-layer structure containing aluminum foil and base fiber, and is a high-temperature heat-shielding material that is excellent in flexibility and abrasion resistance, is unlikely to peel off, and maintains high infrared reflection performance. For the base fiber, aramid fiber, DuPont's Kevlar (registered trademark), glass fiber, etc. may be used. The flame-retardant fabric of the outer layer has a thickness of, for example, 0.5 to 0.8 mm. The non-flammable fabric of the inner layer has a thickness of, for example, 0.7 to 0.8 mm. The combined thickness of the two layers is just 1 to 1.6 mm, allowing the bellows to be extended and folded smoothly.
[0019] The lower inert gas ejection hole 10b is provided on the mold receiving table 5 side of the gap formed between the lower heater 7b and the lower pressing member 6. The upper inert gas ejection hole 10a and the lower inert gas ejection hole 10b are openings provided in an annular body, for example, as shown in Fig. 1C. When both the upper inert gas ejection hole 10a and the lower inert gas ejection hole 10b are provided, the inert gas can be quickly filled into the chamber, but this is not limited thereto, and the inert gas can be filled into the chamber even if only one of them is provided.
[0020] The oxygen concentration sensor 15 measures the oxygen concentration inside the chamber when the chamber is closed. It is preferable that the upper pressing member 4 and the lower pressing member 6 start pressing the workpiece W between them after the oxygen concentration inside the chamber measured by the oxygen concentration sensor 15 falls below a predetermined reference value. The packing 13 prevents the inert gas from leaking out from the contact surface between the upper enclosing plate 11a and the lower enclosing plate 11b when the chamber is closed. In order to ensure the installation of the packing 13, it is advisable to provide flanges on the ends of the upper enclosing plate 11a and the lower enclosing plate 11b, which are the contact surfaces between the upper enclosing plate 11a and the lower enclosing plate 11b.
[0021] The operation of the thus configured apparatus will be described below. Figure 2 is a flow chart showing an embodiment of the isothermal forging method of the present invention. First, the upper heater 7a heats up the clamping surface of the upper pressing member 4 on the side of the lower pressing member 6 to a predetermined temperature determined based on the processing temperature of the workpiece W (S200). At the same time, the lower heater 7b heats up the clamping surface of the lower pressing member 6 on the side of the upper pressing member 4 to the predetermined temperature (S205). In this case, the chamber 1 may be open or closed. If it is closed, the heat from the upper heater 7a and the lower heater 7b does not escape to the outside, so that the temperature can be raised quickly to the predetermined temperature determined based on the processing temperature of the workpiece W. This predetermined temperature is preferably set to a temperature 20°C to 200°C lower than the processing temperature of the workpiece W, for example, but is not limited to this.
[0022] Next, the chamber 1 is opened and the workpiece W is placed at a predetermined processing position of the upper pressing member 4 and the lower pressing member 6 (S210). When the chamber 1 is opened, the upper mold heating furnace 1a and the lower mold heating furnace 1b are open to the outside air. In the upper mold heating furnace 1a in the open state, the upper heat-resistant bellows portion 12a is folded. The upper heater 7a and the upper surrounding plate 11a are held in an upwardly moved state. The movable mold pressing part 2 is also held in an upwardly moved state. The movable mold pressing part 2 and the upper pressing member 4 are fixed together, but the amount of movement of the upper heater 7a and the upper surrounding plate 11a is larger than the amount of movement of the movable mold pressing part 2 and the upper pressing member 4, and the clamping surface of the movable mold pressing part 2 is exposed a small distance from the end surface formed by the upper heater 7a and the upper surrounding plate 11a. In the open lower mold heating furnace 1b, the lower heat-resistant bellows 12b is in a folded state. The lower heater 7b and the lower surrounding plate 11b are held in a state of being moved downward. The mold receiving table 5 is also held in a state of being moved downward. The mold receiving table 5 and the lower pressing member 4 are fixed together, but the amount of movement of the lower heater 7b and the lower surrounding plate 11b is larger than the amount of movement of the mold receiving table 5 and the lower pressing member 4, and the clamping surface of the mold receiving table 5 is exposed a small distance from the end surface formed by the lower heater 7b and the lower surrounding plate 11b.
[0023] Next, the chamber 1 is closed and an inert gas is supplied into the chamber 1 (S215). When the chamber 1 is closed, the upper mold heating furnace 1a and the lower mold heating furnace 1b are closed against the outside air, and the chamber 1 has airtightness to the extent that the chamber 1 can be kept filled with an inert gas. In the upper mold heating furnace 1a in the closed state, the upper heat-resistant bellows portion 12a is in an extended state. The upper heater 7a and the upper surrounding plate 11a are moved toward the lower mold heating furnace 1b and held in a state. The movable mold pressing portion 2 may be in the same position as when the chamber 1 is open, or may be moved toward the mold receiving table 5 and held in a state. The amount of movement of the upper heater 7a and the upper surrounding plate 11a is larger than the amount of movement of the movable mold pressing portion 2 and the upper pressing member 4, and the clamping surface of the movable mold pressing portion 2 is shielded from the outside air by the end surface formed by the upper heater 7a and the upper surrounding plate 11a. In the closed state of the lower mold heating furnace 1b, the lower heat-resistant bellows portion 12b is in an extended state. The lower heater 7b and the lower surrounding plate 11b are moved toward the upper mold heating furnace 1a and held in a state. The mold receiving table 5 may be in the same position as when the chamber 1 is open, or may be moved toward the movable mold pressing unit 2 and held in a state. The movement amount of the lower heater 7b and the lower surrounding plate 11b is larger than the movement amount of the mold receiving table 5 and the lower pressing member 4, and the clamping surface of the mold receiving table 5 is shielded from the outside air by the end surface formed by the lower heater 7b and the lower surrounding plate 11b.
[0024] Next, the oxygen concentration sensor 15 is used to determine whether the oxygen concentration inside the chamber 1 is equal to or lower than a predetermined value (S220). If the oxygen concentration inside the chamber 1 exceeds the predetermined value, the answer is NO, and the supply of inert gas is continued (S215). If the oxygen concentration inside the chamber 1 is equal to or lower than the predetermined value, the answer is YES, and the power supplied to the upper heater 7a and the lower heater 7b is increased (S225), and it is determined whether the temperature of the workpiece W has reached the target temperature (S230). If the temperature of the workpiece W is equal to or lower than the target temperature, the answer is NO, and the heating of the workpiece W is continued. If the temperature of the workpiece W has reached the target temperature, the answer is YES, and the workpiece W is clamped between the upper pressing member 4 and the lower pressing member 6 and processed (S235). Finally, after the workpiece W has been processed, the chamber 1 is opened and the workpiece W is removed from the predetermined processing position (S240).
[0025] The embodiment in Figure 1 shows a case in which the upper mold heating furnace 1a consisting of the upper heat-resistant bellows part 12a, the movable mold pressing part 2, and the upper surrounding plate 11a, and the lower mold heating furnace 1b consisting of the lower heat-resistant bellows part 12b, the mold receiving stand 5, and the lower heat-resistant bellows part 12b, all move in an expandable and contractible manner, but it is also possible to configure the upper mold heating furnace 1a alone to move up and down, and the lower mold heating furnace 1b not to move up and down in conjunction with the opening and closing operation of the chamber. Fig. 3 is a cross-sectional view of the configuration of a constant temperature forging device showing another embodiment of the present invention, (A) shows the chamber in a closed state, and (B) shows the chamber in an open state. In Fig. 3, the same reference numerals are used for the parts having the same functions as those in Fig. 1, and the explanation thereof will be omitted.
[0026] In the embodiment of Fig. 3, the mold receiving table 5 and the lower pressing member 6 are similar to those of the embodiment of Fig. 1. The lower heater 7b is provided along the outer peripheral wall side of the lower pressing member 6, and for example, an electric heating coil is used. The lower surrounding plate 11b is provided on the outer peripheral wall side of the lower heater 7b, and is made of a heat-resistant material that can withstand high temperatures of, for example, about 400°C to 1000°C. The lower heat-resistant bellows portion 12b is not provided. The lower inert gas ejection hole 10b is provided on the mold receiving table 5 side of the gap formed between the lower heater 7b and the lower pressing member 6.
[0027] In the figure, chamber 1 is an openable space into which inert gas can be introduced, and when closed, it is configured to include upper mold heating furnace 1a and lower mold heating furnace 1b. Upper mold heating furnace 1a is configured to include upper heat-resistant bellows portion 12a, movable mold pressing portion 2, upper surrounding plate 11a, and upper heater 7a. Lower mold heating furnace 1b is configured to include mold receiving table 5, lower surrounding plate 11b, and lower heater 7b.
[0028] The operation of the thus configured apparatus will be described below. In the embodiment of Fig. 3, the operation is also in accordance with the flow chart shown in Fig. 2. Note that the operation of the upper mold heating furnace 1a is the same as in the embodiment of Fig. 1, so the explanation will be omitted. First, following S200 and S205, the chamber 1 is opened and the workpiece W is placed at a predetermined processing position between the upper pressing member 4 and the lower pressing member 6 (S210). In the lower mold heating furnace 1b with the chamber open, the lower heater 7b and the lower surrounding plate 11b are held in a state of being fixed to the mold receiving table 5. The clamping surface of the mold receiving table 5 is exposed a short distance from the end surface formed by the lower heater 7b and the lower surrounding plate 11b.
[0029] Next, the chamber 1 is closed and an inert gas is supplied into the chamber 1 (S215). Even in the lower mold heating furnace 1b with the chamber 1 closed, the lower heater 7b and the lower surrounding plate 11b are held in a state fixed to the mold receiving table 5 side. The mold receiving table 5 may be in the same position as when the chamber 1 is open, or may be held in a state moved toward the movable mold pressing unit 2. The clamping surface of the mold receiving table 5 is shielded from the outside air by the end surface formed by the lower heater 7b and the lower surrounding plate 11b. The subsequent processing steps are the same as S220 to S240. According to the embodiment of FIG. 3, since there is no need to provide the lower heat-resistant bellows portion 12b, the device configuration is simplified. [Industrial Applicability]
[0030] As described above in detail, the constant temperature processing apparatus according to the present invention has a die heating furnace capable of controlling the atmosphere with inert gas (Ar, N2), and a heating method that suppresses die oxidation has been developed. This makes it possible to carry out constant temperature forging using Mo alloy dies at high temperatures without using a vacuum chamber, and has the effect of dramatically improving work efficiency. Furthermore, the constant temperature processing apparatus according to the present invention enables forging in an environment with a significantly reduced oxygen concentration through atmospheric control, and thus enables Mo alloy dies with poor oxidation resistance to be used for long periods at high temperatures. [Explanation of symbols]
[0031] 1 Chamber 1a Upper mold heating furnace 1b Lower mold heating furnace 2 Ram bed plate (movable mold pressing part, upper base) 4 Upper die (upper pressing member) 5 Bed plate (mold receiving stand, lower base) 6 Lower die (lower pressing member) 7a, 7b Heater (heating coil) 8 Inert gas supply pipe 9 Inert gas supply valve 10a, 10b Inert gas outlet 11a, 11b Surrounding board 12a, 12b Heat-resistant bellows 13 Packing 15 Oxygen Sensor W Work material M heating material
Claims
1. An upper pressing member and a lower pressing member for clamping and processing the workpiece; an upper heater provided so as to be movable in the up and down direction along the outer peripheral wall side of the upper pressing member; a lower heater provided so as to be movable in the up-down direction along an outer peripheral wall side of the lower pressing member; an upper surrounding plate disposed on an outer peripheral wall side of the upper heater; a lower surrounding plate disposed on an outer peripheral wall side of the lower heater; A movable mold pressing portion fixed to the upper pressing member; A mold receiving stand fixed to the lower pressing member; an upper heat-resistant bellows portion connecting the movable mold pressing portion and the upper surrounding plate; a lower heat-resistant bellows portion connecting the mold receiving base and the lower surrounding plate; A constant temperature processing apparatus comprising: The upper heat-resistant bellows portion, the movable mold pressing portion, the upper surrounding plate, the lower heat-resistant bellows portion, the mold receiving base, and the lower surrounding plate form an openable and closable chamber filled with an inert gas; When the chamber is open, the workpiece can be inserted and removed between the upper pressing member and the lower pressing member; a constant temperature processing apparatus configured such that, when the chamber is closed, the upper pressing member and the lower pressing member clamp the workpiece, and, in the clamping state, the upper heater and the lower heater maintain a predetermined high temperature state.
2. an upper inert gas ejection hole provided on the movable mold pressing portion side of a gap formed between the upper heater and the upper pressing member; and at least one of a lower inert gas ejection hole provided on the mold receiving table side of a gap formed between the lower heater and the lower pressing member, 2. The constant temperature processing apparatus according to claim 1, wherein the inert gas is supplied from at least one of the upper inert gas outlet and the lower inert gas outlet when the chamber is closed.
3. Further, an oxygen concentration sensor is provided for measuring an oxygen concentration inside the chamber when the chamber is closed, The constant temperature processing apparatus according to claim 1, characterized in that the upper and lower pressure members start clamping the workpiece when the oxygen concentration inside the chamber measured by the oxygen concentration sensor falls below a predetermined reference value.
4. The constant temperature processing apparatus according to claim 1, further comprising a gasket for preventing the inert gas from leaking to the outside from the contact surface between the upper enclosing plate and the lower enclosing plate when the chamber is closed.
5. The upper heater heats up the clamping surface of the upper press member facing the lower press member to a predetermined temperature determined based on the processing temperature of the workpiece, and the lower heater heats up the clamping surface of the lower press member facing the upper press member to the predetermined temperature; With the chamber open, the workpiece is placed at a predetermined processing position between the upper pressing member and the lower pressing member; The chamber is closed, and an inert gas is supplied to the inside of the chamber; determining whether the oxygen concentration inside the chamber is equal to or lower than a predetermined value, and if it is greater than the predetermined value, continuing to supply the inert gas; after the oxygen concentration inside the chamber is equal to or lower than the predetermined value, increasing the power supplied to the upper heater and the lower heater; and after the temperature of the workpiece reaches a target temperature, processing the workpiece; After the workpiece is processed, the chamber is opened and the workpiece is removed from the predetermined processing position. A constant temperature processing method.
6. An upper pressing member and a lower pressing member for clamping and processing the workpiece; an upper heater provided so as to be movable in the up and down direction along the outer peripheral wall side of the upper pressing member; a lower heater provided along an outer peripheral wall side of the lower pressing member; an upper surrounding plate disposed on an outer peripheral wall side of the upper heater; a lower surrounding plate disposed on an outer peripheral wall side of the lower heater; A movable mold pressing portion fixed to the upper pressing member; A mold receiving stand fixed to the lower pressing member; an upper heat-resistant bellows portion connecting the movable mold pressing portion and the upper surrounding plate; A constant temperature processing apparatus comprising: The upper heat-resistant bellows portion, the movable mold pressing portion, the upper surrounding plate, the mold receiving base, and the lower surrounding plate form an openable and closable chamber filled with an inert gas; When the chamber is open, the workpiece can be inserted and removed between the upper pressing member and the lower pressing member; a constant temperature processing apparatus configured such that, when the chamber is closed, the upper pressing member and the lower pressing member clamp the workpiece, and, in the clamping state, the upper heater and the lower heater maintain a predetermined high temperature state.