JPH0321799Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention is applicable to presses that require hermetic shielding for Ti-based alloys, Ni-based alloys, etc. in superplastic forging or isothermal forging in which the mold temperature is maintained at or near the material temperature. molding chamber equipment,
In particular, it concerns the upper shielding device. (Conventional technology) Superplastic forging and isothermal forging of difficult-to-process materials such as Ti-based alloys and Ni-based alloys utilize the superplastic behavior that occurs in those materials at specific temperatures and strain rates through forging. However, this superplastic deformation behavior is sensitive to the strain rate as well as the deformation temperature. Therefore, it is necessary to maintain a uniform temperature distribution of the material in order to allow the material to flow uniformly within the mold. A heating device is housed in a chamber to uniformly control the temperature distribution of the mold. 3 and 4 show examples of the upper shielding structure of the chamber device used in conventional constant temperature forging. In the example of FIG. 3, the chamber upper cover 3' is fixed to a press ram (not shown), and the upper cover The upper chamber 10 and the lower chamber 11, including the chamber 3', slide against each other to accommodate the heating device 2 and the mold M therein to maintain a sealed state. Moreover, in the example of FIG. 4, the upper plate 1a of the chamber 1,
A metal bellows part 4' is placed between the upper cooling plate 3, which is a part of an upper mold fixed to a press ram (not shown), to form a sealed structure. (Problem to be solved by the invention) However, in the case of the above-mentioned chamber upper shielding structure, first of all, in the former case, the chamber internal volume changes greatly as the press ram moves up and down, which is a characteristic of isothermal forging. However, the method in which the chamber top cover is fixed to the press ram does not solve this problem at all. Moreover, in the latter case, a bellows structure using a metallic heat-resistant material as an airtight shield structure requires a flexible form and a thin structure to minimize the height when compressed. However, there remains a problem with heat resistance to high temperatures. In view of the above-mentioned actual situation, the present invention further improves the sealing and shielding structure between the chamber upper plate and the press fixing part such as the upper cooling plate fixed to the press ram, thereby achieving weight reduction and bellows. Not only is it flexible against deformation, but it also ensures reliable sealing and shielding.
The purpose is to stabilize the temperature of the forging die. (Means for Solving the Problems) That is, the feature of the present invention that meets the above object is that the upper molds are fixed to the lowering device of the press, and at least one set of molds and a heating device are installed inside the device. In the upper shielding device of the chamber device for constant temperature forging included in the above, the press fixing part such as the upper cooling plate and the chamber top plate are basically connected in a hermetically sealed manner by a bellows mechanism, and (a) the bellows material constituting the bellows mechanism is (b) A second insulation shielding mechanism made of a high temperature heat resistant material is provided between the bellows mechanism and the heating device. (c) A bellows material of the bellows mechanism. The above-mentioned (a), (b), and (c) of providing a cooling means for applying a cooling flow to the outer surface are provided independently or in conjunction with each other as needed. (Function) According to the device of the present invention having the above-mentioned features, fluctuations in the internal volume of the chamber due to the lifting and lowering of the press ram are reduced compared to when the entire chamber top cover is fixed to the press ram, and the temperature of the forging die is stabilized. In addition, by making the bellows material a laminated structure of silicone rubber and a heat-resistant fiber layer, it has superior insulation effect and elasticity compared to conventional metal insulation structures, and improves the reliability of the sealed structure. Further, by providing the second heat-insulating shielding mechanism, it is possible to prevent wear and tear on the bellows mechanism, and furthermore, by cooling the outer surface of the bellows material, use within the heat resistance limit of silicone rubber is further ensured. (Example) Hereinafter, an example of the device of the present invention will be described based on the accompanying drawings. FIG. 1 is a diagram showing an example of the upper shielding device of the chamber device according to the present invention. In the figure, 1 indicates the chamber, 2 indicates the heating device, and 3 indicates the upper cooling lid, which is a part of the upper mold. Although an upper cooling plate 3 is not shown, it is fixed to a lowering device of a press, that is, a press ram, and at least one set of molds M and a heating device 2 are housed in the chamber 1. It is similar to the previous chamber device, particularly shown in FIG. 4, and is also similar in that a bellows mechanism 4 is placed between the chamber upper plate 1a and the upper cooling plate 3 fixed to the press ram to form a sealed structure. be. However, in conventional devices, the bellows mechanism 4 is usually made of a metallic material, but in the present invention, it is made of silicone as shown in FIG. A laminated structural material of rubber 4a and a fiber layer 4b made of various heat-resistant fibers such as glass fiber, carbon fiber, silicon nitride fiber, etc. is used. Of course, a metallic material is sufficient and the use of the same material is not excluded if it can withstand use. In addition, in the illustrated embodiment of the present invention, in addition to the bellows mechanism 4, a second heat-insulating shield made of a high-temperature heat-resistant material is provided between the bellows mechanism 4 and the heating device 2 in order to provide insulation shielding between the two. A mechanism 6 is installed. This heat insulation shielding mechanism 6 is composed of a heat-resistant ring part 6a as shown in FIG.

[Table] From the above table, it can be seen that when the outer surface of the bellows mechanism is cooled with spray cooling water, silicone rubber as the bellows material is sufficient. However, in the absence of spray cooling, the temperature of the inner surface of the bellows rises slightly, which poses a problem in using silicone rubber. In this case, it is preferable to use a metallic heat-resistant material, although there are some problems with weight and deformation flexibility. In any case, in the case of the conventional device shown in Fig. 4, the bellows temperature was over 1000°C, and even metal materials were susceptible to damage due to repeated use at high temperatures.
The performance of the chamber device is significantly improved compared to the difficulty of maintaining a hermetic shield. (Effects of the invention) As described above, the present invention provides an upper shielding device for a chamber device for isothermal forging in which the upper molds are fixed to the lowering device of the press and includes at least one set of molds and a heating device inside. This is based on the premise that the fixed part and the chamber top plate are hermetically connected by a bellows mechanism, and the fluctuation in the volume inside the chamber due to the lifting and lowering of the press ram is reduced compared to the case where the entire chamber top cover is fixed to the press ram. Therefore, the temperature of the forging die is easily stabilized, which is advantageous for constant temperature forging, and
By making the bellows mechanism a laminated structure of silicone rubber and heat-resistant fibers, the insulation effect and elasticity are superior to that of metal materials, so the reliability of the sealed structure can be increased. In addition, in the device of the present invention, the second shielding mechanism made of a high-temperature heat-resistant material is provided inside the bellows mechanism, and since the second shielding mechanism inside performs insulation shielding, wear and tear of the bellows material can be prevented, making it economical. In addition to having excellent cooling properties, if a cooling means that applies a cooling flow to the outer surface of the bellows material is provided, it has an excellent cooling effect, lowering the temperature of the inner surface of the bellows material and further ensuring that it can be used within the heat resistance limits of silicone rubber etc. It is expected to have a significant effect in reducing weight and ensuring flexibility against deformation, which is required for bellows.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing an example of the upper shielding device of the chamber device according to the present invention, with the right half shown when the press is lowered and the left half shown when the upper shielding device is raised. Figures 2A and 4B are schematic diagrams showing the configuration of each component of the bellows mechanism A and the second shielding mechanism B in the device of the present invention, and Figures 3 and 4
Both figures are schematic diagrams showing examples of the upper shielding device of a known chamber device, with the right half shown when the press is lowered and the left half shown when the press is raised. 1...Chamber, 1a...Chamber upper plate, 2...
... heating device, 3 ... upper cooling board, 4 ... bellows mechanism, 4a ... silicone rubber, 4b ... heat-resistant fiber layer, 5 ... cooling means, 6 ... second heat insulation shielding mechanism.

Claims (1)

[Scope of claims for utility model registration] 1. Upper molds are fixed to a press lowering device,
In an upper shielding device of a chamber device for constant temperature forging including at least one set of molds and a heating device therein, the chamber upper plate and a press fixing part such as an upper cooling plate are tightly connected by a bellows mechanism, and An upper shielding device for a chamber device for constant temperature forging, characterized in that the bellows mechanism is formed of a laminated material of silicone rubber and a heat-resistant fiber layer. 2. An upper shielding device for a chamber device for isothermal forging according to claim 1, wherein the bellows mechanism is provided with cooling means for applying a cooling flow to the outer surface of the bellows mechanism. 3. In the upper shielding device of a chamber device for isothermal forging, in which the upper molds are fixed to a press lowering device and includes at least one set of molds and a heating device, the chamber upper plate and the press fixing device, such as an upper cooling plate, are used. A chamber device for isothermal forging, characterized in that a second heat-insulating shielding mechanism made of a high-temperature heat-resistant material is provided between the bellows mechanism and the heating device. Upper shielding device. 4. The upper shielding device for a chamber device for constant temperature forging according to claim 3, wherein the bellows mechanism is formed of a laminated material of silicone rubber and a heat-resistant fiber layer. 5. In the upper shielding device of a chamber device for isothermal forging, in which the upper molds are fixed to a press lowering device and includes at least one set of molds and a heating device, the chamber upper plate and the press fixing device, such as an upper cooling plate, are used. and a second heat-insulating shielding mechanism made of a high-temperature heat-resistant material is further provided between the bellows mechanism and the heating device,
An upper shielding device for a chamber device for isothermal forging, characterized in that a cooling means for applying a cooling flow to the bellows mechanism is attached to the outside of the bellows mechanism.