JP5687934B2 - Rubber mold of isotropic pressure press - Google Patents

Description

  The present invention relates to a rubber mold for an isotropic pressure pressurizer, and in particular, eliminates the merit as a rubber mold consumable for a dry isostatic pressurizer, thereby reducing productivity and increasing the cost of the pressurizer. The present invention relates to a rubber mold of an isotropic pressure pressurizing apparatus that does not invite.

  The isotropic pressure pressurizing apparatus uses a fluid as a pressure medium and applies a high pressure isotropic pressure of 100 MPa or more to a powder material, etc., and forms it into various shapes such as a solid rod-shaped body, a cylindrical body or a bottomed cylindrical body. It is a device and is used as a powerful molding device in the field of ceramics and powder metallurgy. Such an isotropic pressure pressurizer is either a wet type that directly pressurizes a rubber mold in a pressure medium such as water, or a dry type that pressurizes via a rubber mold incorporated in a pressure vessel. There is.

  In the rubber mold of the dry isotropic pressure pressurizing device, elastic deformation due to pressurization is constrained in the fitting portion with the pressure vessel or the lid, while other portions other than the fitting portion are greatly deformed in the radial direction. For this reason, the amount of deformation of the rubber mold suddenly changes between the fitting part and the non-fitting part, resulting in non-uniformity in the axial direction of the outer diameter of the molded product, and chipping or cracking caused by this. May occur, leading to a decrease in yield. In addition, wear at the fitting part of the rubber mold is remarkably reduced, resulting in a decrease in the life of the rubber mold or a decrease in the sealing performance with the pressure vessel, causing a pressure medium to enter the mold and causing defective molding. There was also a problem.

  First, the prior art for improving such problems will be described with reference to FIGS. 4 is a cross-sectional view showing an embodiment of a cold isostatic press molding mold according to Conventional Example 1, and FIG. 5 is an elevational cross section showing an embodiment of a dry cold positive water pressure press according to Conventional Example 2. FIG.

  As shown in FIG. 4, the cold isostatic pressing mold according to the conventional example 1 has an opening 14 of a rubber mold 13 in which a powder material 12 is accommodated by a metal lid 15 so as to be detachable. The lid 15 has a small diameter portion 18 that is inserted into the rubber mold 13 and a large diameter portion 19 that is located outside the rubber mold 13 and contacts the end surface of the rubber mold 13. The rubber mold 13 deforms when the powder material 12 is pressed by disposing the interposed ring 11 made of an elastic material between the outer peripheral surface of the inner edge of the portion 18 and the inner peripheral surface of the rubber mold 13. This prevents the wear of the part (see Patent Document 1).

  However, in the molding die for pressure molding according to the conventional example 1, the end opening diameter of the rubber die 13 has to be reduced by disposing the interposed ring 11. Conventional Example 1 is applicable only when it is allowed, and the inner diameter of the rubber mold 13 must be a simple circular shape (for example, in the cylindrical molding as shown in FIG. When the difference between the outer diameter of the mandrel 16 and the mandrel 16 is very small, or for the purpose of improving the packing density after supplying the powder material 12, it is necessary to compress the powder material 12 with a jig slightly smaller than the inner diameter of the rubber mold 12 Is not applicable).

  In addition, the intercalation ring 11 has a structure that can be separated from the metal lid 15 and the rubber mold 13 for the purpose of exchanging as a consumable, so that an automatic device (such as a dry CIP device) that requires high productivity is required. Then, a complicated process is required for the attachment / detachment process of the interposing ring 11, which causes a decrease in productivity and an increase in apparatus cost. Even if the interstitial ring 11 is fixed by adhesion or the like, when it is fixed to the rubber mold 13, there is no merit of making the interstitial ring 11 a consumable, and when it is fixed to the metal lid 15, the rubber mold There is a possibility that the powder material 12 enters between the contact ring 13 and the interposed ring 11 is damaged by pressurization. Therefore, in a fully automatic CIP device or the like, a simple rubber mold without the interposing ring 11 is desirable.

  Next, in the dry cold isostatic pressing device according to Conventional Example 2, as shown in FIG. 5, a radial molding pressure by the pressurizing rubber mold 22 is applied to at least one end face of the upper and lower punches 26 and 27. Axial pressure is applied by receiving and elastically deforming, and a rubber lid 23 that can be elastically restored is mounted, and a metal spacer 24 that contacts the molded body 21 is provided on the opposite side of the mounting surface. (See Patent Document 2).

  However, this conventional example 2 suppresses deformation of the end surface of the pressure rubber mold 22 by providing the rubber lid 23 and the metal spacer 24 on at least one end surface of the upper and lower punches 26 and 27. There is a problem that the vertical molding space is reduced by that portion. In addition, the presence of the metal spacer 24 causes a problem that the deformation is uneven only in that portion.

  Further, in the dry cold isostatic pressing device according to the conventional example 3, the inner rubber cylinder mold is thinner than the outer rubber cylinder mold and the rubber hardness is increased, but the purpose thereof is easy replacement of the rubber mold. Or to keep prices down. However, since the rubber hardness of the inner rubber cylinder mold is increased over the entire surface, the elastic deformation at the center in the height direction of the inner rubber cylinder mold is reduced, and the elasticity of the rubber mold is inferior (Patent Document) 3).

JP-A-1-66099 No. 7-39503 Japanese Utility Model Publication No. 5-4956

  Accordingly, an object of the present invention is to provide a rubber mold of an isotropic pressure pressurizing apparatus that can be applied under various usage conditions and can prevent damage to the inner wall of the rubber mold during pressurization.

  In order to achieve the above object, the means employed by the rubber mold of the isotropic pressure device according to claim 1 of the present invention is fitted to the cylindrical rubber mold body and the upper and lower openings of the rubber mold body. The space formed by the rubber mold body and the lid body is filled with a powdery molding raw material, and the rubber mold body is removed from the outer periphery of the rubber mold body by a pressure medium. The present invention relates to a rubber mold for an isotropic pressure pressurizing apparatus that press-molds a forming raw material by applying isotropic pressure.

The means employed by the rubber mold of the isotropic pressure pressurizing apparatus according to claim 1 of the present invention is an inner portion of the rubber mold body including a tangent line between the inner peripheral surface of the rubber mold body and the inner surface of the lid body. The peripheral portion is constituted by an annular rubber member made of high-hardness rubber having a higher hardness than the rubber material of the other part constituting the rubber mold main body, and the inner peripheral surface of the annular rubber member in the rubber mold main body, it is characterized in that the stage difference between the inner peripheral surface of the other rubber-type body is not.

  The means adopted by the rubber mold of the isotropic pressure pressing apparatus according to claim 2 of the present invention is the rubber mold of the isotropic pressure pressing apparatus according to claim 1, wherein the annular rubber member is the rubber mold body. It is characterized in that it is embedded and joined in a circumferential groove provided in the.

  The rubber mold of the isotropic pressure pressurizing apparatus according to claim 3 of the present invention is the rubber mold of the isotropic pressure pressurizing apparatus according to claim 1 or 2, wherein the annular rubber member is An intermediate rubber layer consisting of one or more layers is provided between the hardness rubber and the rubber mold body, and the rubber hardness of the intermediate rubber layer is intermediate between the rubber hardness of the high hardness rubber and the rubber mold body. It is characterized by having hardness.

  According to the rubber mold of the isotropic pressure applying apparatus according to claim 1 of the present invention, the rubber mold body includes a cylindrical rubber mold body and a lid fitted to the upper and lower openings of the rubber mold body. A space defined by the rubber mold main body and the lid is filled with a powdery molding raw material, and the rubber mold main body is isostatically pressurized with a pressure medium from the outer periphery of the rubber mold main body, thereby forming the molding raw material. The present invention relates to a rubber mold of an isotropic pressure pressurizing apparatus.

And the inner peripheral part of the rubber mold main body including the tangent line between the inner peripheral surface of the rubber mold main body and the inner surface of the lid body is higher in hardness than the rubber material of other parts constituting the rubber mold main body. together constituted by an annular rubber member made of rubber, and the inner peripheral surface of the annular rubber member in the rubber-type body, other so-stage difference is not between the inner peripheral surface of the rubber-type body, under various usage In addition, the life against damage to the inner wall of the rubber mold main body during pressurization is improved, and the running cost is reduced.

  Further, according to the rubber mold of the isotropic pressure applying apparatus according to claim 2 of the present invention, the annular rubber member is embedded and joined in a circumferential groove provided in the rubber mold body. As a result, a more stable behavior can be obtained, which contributes to longer life.

  Furthermore, according to the rubber mold of the isotropic pressure applying apparatus according to claim 3 of the present invention, the annular rubber member is composed of one layer or two or more layers between the high hardness rubber and the rubber mold body. An intermediate rubber layer is provided, and the rubber hardness of the intermediate rubber layer is intermediate between the high hardness rubber and the rubber hardness of the rubber mold body, so that the inner peripheral surface of the rubber mold body and the lid The rubber hardness of the rubber mold main body in the vicinity of the tangent to the inner surface of the rubber mold gradually changes from the inner diameter side toward the outer diameter side, and the behavior of the rubber mold further contributes to longer life.

FIG. 3 is a partial elevational cross-sectional view showing a right half of the upper structure of the rubber mold of the isotropic pressure pressurizing apparatus according to the first embodiment of the present invention. It is a partial elevation sectional view showing other modes of Embodiment 1 of the present invention and showing the upper half right part of the rubber type upper part of an isotropic pressure pressurization device. It is a fragmentary sectional view which shows the upper half right structure half of the rubber type | mold of an isotropic pressure application apparatus concerning Embodiment 2 of this invention. It is sectional drawing which shows the Example of the shaping | molding die for cold isostatic pressurization shaping | molding which concerns on the prior art example 1. FIG. It is an elevational sectional view showing an example of a dry type cold positive water pressure pressurizing device according to Conventional Example 2.

  First, the rubber mold of the isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention will be described below with reference to the attached FIGS. FIG. 1 relates to the first embodiment of the present invention, and is a partial elevation sectional view showing the right half of the upper structure of the rubber mold of the isotropic pressure pressurizing apparatus. FIG. 2 shows another example of the first embodiment of the present invention. It is a fragmentary sectional view which shows the upper half right structure of the rubber mold | type of an engaging and isotropic pressure pressurization apparatus. In FIGS. 1 and 2, illustration of the seal part, holding jig, CIP device and the like outside the rubber mold is omitted. The rubber mold is configured to be rotationally symmetric with respect to the center line C of the rubber mold body.

  The rubber mold of the isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention includes a cylindrical rubber mold body 1 and a lid body 2 fitted in the upper opening of the rubber mold body 1. The space defined by the rubber mold body 1 and the lid body 2 is filled with a powdery molding raw material 3. And the molding raw material 3 is press-molded by the isotropic pressure from the outer peripheral part of this rubber-type main body 1 with the pressure medium which uses fluids, such as water, as a medium, and is shape-molded by the predetermined shape. Reference symbol C indicates a center line of the cylindrical rubber mold body 1.

  In the rubber mold main body 1 of such an isotropic pressure pressurizing apparatus, the inner peripheral portion of the rubber mold main body 1 in the vicinity of the tangent line between the inner peripheral surface 1a of the rubber mold main body 1 and the inner surface 2a of the lid 2 is a rubber. It is comprised by the cyclic | annular rubber member 4 which consists of the high hardness rubber | gum 5 whose hardness is higher than the rubber material of the other part which comprises the type | mold main body 1. FIG. At the same time, there is substantially no step between the inner peripheral surface 4 a of the annular rubber member 4 in the rubber mold main body 1 and the inner peripheral surface 1 a of the other rubber mold main body 1. Here, “substantially” means that there is no step at all, and that the step is very small, such as an error in molding, and has an effect on the product molded during isotropic pressure application. Including the case where there is nothing.

  In the rubber mold of the isotropic pressure pressurizing device according to the first embodiment of the present invention, the inner surface 2a of the lid portion 2 is near the corner where the inner surface 4a of the annular rubber member 4 contacts with the deformation due to pressurization. At the same time when a large tension is generated, the molding raw material 3 may enter the fitting portion between the lid portion 2 and the annular rubber member 4, so that the material of the annular rubber member 4 exposed to the harsh environment is high. Hard rubber is required. Further, it is necessary to select a wall thickness T for the annular rubber member 4 so as not to affect the elasticity of the entire rubber mold body 1. On the other hand, since the rubber mold body 1 is required to have an appropriate elastic behavior (less permanent set) as a rubber mold, it is important to select a material and hardness that can meet the elastic behavior.

  Accordingly, the rubber hardness of the rubber mold body 1 is preferably in the range of Hs 50 to 70 in rubber shore (JIS A), whereas the rubber hardness of the high hardness rubber 5 constituting the annular rubber member 4 is in rubber shore (JIS A). A range of more than Hs70 and 90 or less is preferable. 1 and 2, the inner radius R of the rubber mold body 1 is about 30 to 300 mm, the wall thickness T1 is about 10 to 300 mm, and the fitting length L between the rubber mold body 1 and the lid 2 is 10 to 10 mm. On the other hand, the thickness T2 of the annular rubber member 4 is preferably about 5 to 20 mm.

  Further, the upper height formed by the inner peripheral surface 4a of the annular rubber member 4 from the inner surface 2a of the lid 2 is T to L, and the lower height formed by the inner peripheral surface 4a from the inner surface 2a of the lid 2 is T to R. It is desirable. Then, in FIG. 1, when the height of the upper part formed by the inner peripheral surface 4 a of the annular rubber member 4 from the inner surface 2 a of the lid body 2 is L, the aspect corresponds to FIG. 2.

  Furthermore, a circumferential groove 1b having the same cross-sectional shape as the annular rubber member 4 is provided on the inner circumferential surface 1a of the rubber mold body 1, and the annular rubber member 4 is embedded in and joined to the circumferential groove 1b. Is preferred. With such a configuration, the annular rubber member 4 can obtain a more stable behavior as a rubber mold and contribute to a longer life. A rubber adhesive or the like can be used for joining the annular rubber member 4 into the circumferential groove 1b.

  In addition, the rubber mold of the isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention may have a cross-sectional shape of the rubber mold main body 1 other than a circle, a rectangle, or other special shapes. The rubber mold of the isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention has been described by showing only the upper opening of the rubber mold main body 1 in FIGS. In addition, the structure having a vertically symmetric cross-sectional shape and the same function as the upper opening are provided. In Embodiment 1, an example in which the high hardness rubber mold according to the present invention is applied to both the upper and lower sides is shown, but only one of the upper and lower sides may be used.

  Although not shown in the drawings, the present invention can also be applied to a case where a cylindrical molded body is formed by using the lid body 2 for positioning and passing the core (mandrel) through the opening. Furthermore, the cross-sectional shape of the annular rubber member 4 is not limited to the shape of the upper and lower end portions as shown in FIGS. 1 and 2, but other shapes such as a shape orthogonal to the center line C and a shape having an arc. It may be.

  According to the rubber mold of the isotropic pressure applying apparatus according to the first embodiment of the present invention, the inner circumference of the rubber mold body 1 in the vicinity of the tangent line between the inner circumferential surface 1a of the rubber mold body 1 and the inner surface 2a of the lid 2. The portion is constituted by an annular rubber member 4 made of a high hardness rubber 5 having a hardness higher than that of the rubber material of the other part constituting the rubber die body 1, and the inner peripheral surface 4 a of the annular rubber member 4 in the rubber die body 2. In addition, there is substantially no step between the inner peripheral surface 1a of the rubber mold body 2 and the life against damage to the inner wall of the rubber mold body 2 during pressurization is improved, which contributes to a reduction in running cost. is there.

Next, a rubber mold of an isotropic pressure applying apparatus according to Embodiment 2 of the present invention will be described below with reference to the attached FIG. FIG. 3 is a partial vertical sectional view showing a right half of the upper structure of the rubber mold of the isotropic pressure pressurizing apparatus according to the second embodiment of the present invention.
Note that the second embodiment of the present invention differs from the first embodiment in the configuration of the annular rubber member, and the rest of the configuration is exactly the same, so the description is limited to the configuration of the annular rubber member. And

  That is, the annular rubber member 4 according to the first embodiment of the present invention has an inner peripheral portion of the rubber mold body 1 in the vicinity of a tangent line between the inner peripheral surface 1a of the rubber mold body 1 and the inner surface 2a of the lid body 2. The annular rubber member 4 according to the second embodiment of the present invention has a high hardness rubber 5 whereas the rubber mold body 1 is composed of one layer of the high hardness rubber 5 having a higher hardness than the rubber material of the other parts constituting the rubber mold body 1. An intermediate rubber layer 6 consisting of one layer is provided between the rubber mold body 1 and the rubber mold body 1. At the same time, the annular rubber member 4 is configured such that the rubber hardness of the intermediate rubber layer 6 is intermediate between the rubber hardness of the high hardness rubber 5 and the rubber mold body 1. In this case, when the hardness of the rubber mold body 1 is Hs 50 to 70, it is desirable that the hardness of the intermediate rubber layer 6 is about Hs 60 to 80 and the hardness of the high hardness rubber 5 is about Hs 70 to 90. As for the hardness of the rubber mold, it is necessary to make the inner hardness higher than the outer hardness.

  The intermediate rubber layer 6 is not limited to one layer and may be two or more layers. In the case of such a configuration, the rubber hardness of each intermediate rubber layer 6 is intermediate between the rubber hardness of the high-hardness rubber 5 and the rubber mold body 1 and is configured to gradually change. Is essential. Since the annular rubber member 4 is configured as such an intermediate rubber layer 6, the rubber hardness of the rubber mold main body in the vicinity of the tangent line between the inner peripheral surface 1 a of the rubber mold main body 1 and the inner surface 2 a of the lid 2. However, it gradually changes from the inner diameter side toward the outer diameter side, and as a result, the behavior of the rubber mold is further stabilized and contributes to the longer life.

C: Center line of the rubber mold body,
L: fitting length of rubber mold body and lid,
R: radius of the inner peripheral surface of the rubber mold body,
T1: Thickness of the rubber mold body
T2: wall thickness of the annular rubber member,
1: rubber mold body, 1a: inner peripheral surface, 1b: circumferential groove,
2: lid, 2a: inner surface,
3: Molding material,
4: annular rubber member, 4a: inner peripheral surface,
5: High hardness rubber,
6: Intermediate rubber layer

Claims (3)

Consists of a cylindrical rubber mold body and a lid fitted to the upper and lower openings of this rubber mold body,
The space defined by the rubber mold main body and the lid body is filled with a powdery molding raw material, and the rubber mold main body is isotropically pressurized with a pressure medium from the outer periphery of the rubber mold main body, thereby forming the rubber mold main body. In the rubber mold of the isotropic pressure press for pressing the raw material,
The inner peripheral portion of the rubber mold main body including the tangent line between the inner peripheral surface of the rubber mold main body and the inner surface of the lid body is made of a high hardness rubber whose hardness is higher than that of the rubber material of the other part constituting the rubber mold main body And an annular rubber member
And the inner peripheral surface of the annular rubber member in the rubber-type body, rubber-type isostatic pressure and wherein the step difference is not between the inner peripheral surface of the other rubber-type body.   The rubber mold for an isotropic pressure pressurizing apparatus according to claim 1, wherein the annular rubber member is embedded and joined in a circumferential groove provided in the rubber mold main body.   In the annular rubber member, an intermediate rubber layer consisting of one layer or two or more layers is provided between the high-hardness rubber and the rubber mold main body, and the rubber hardness of the intermediate rubber layer is equal to the high-hardness rubber and the rubber. The rubber mold for an isotropic pressure pressurizing device according to claim 1 or 2, wherein the rubber mold has an intermediate hardness of the rubber hardness of the mold body.

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