JPH01157799A - Internal pressure rubber press device - Google Patents

Abstract

PURPOSE:To draw out a formed part without damaging it at all by constituting an outside pressure receiving tool of a segmental rigid die, an outside pressure cylindrical body and a holding case. CONSTITUTION:A fixed shaft 2 is installed in a holding case 19, and a raw material filling space A which has been formed between a segment rigidity die 17 to which a segmental die 16 is connected and a mold 4 is filled with a raw material S. Subsequently, the raw material filling space A is covered by installing a cover body 9, a holding tool 8 is screwed and attached to the holding case 19, a pressurized fluid 7 is supplied to a first pressurized fluid feed/discharge port 2b of the fixed shaft 2 through a high pressure feed pipe 45, and also, supplied to a second pressurized fluid feed/discharge port 19b of the holding case 19. Subsequently, a raw material S and an outside pressure cylindrical body 18 are pressurized through the mold 4. Next, they are pressurized to below the pressure which does not deform nor breaks down the segmental rigidity die 17 and after a prescribed time has elapsed, the pressurized fluid 7 is discharged. As a result, an inside pressure cylindrical body 3 and the mold 4 are returned elastically to the original shape automatically by following up the pressure reduction. Also, when the pressure becomes '0', the segmental die 16 adhering closely and abutting onto a formed part 10, are released.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an improvement in an internal pressure rubber press device that presses and molds a raw material such as slurry, clay, or powder filled in an annular raw material filling space from the inside.

[Conventional technology]

Conventionally, as shown in FIG. 13, an internal pressure rubber press device @1 has a pressurized flow closed inner surface 2a formed on the outer peripheral surface and a pressurized fluid supply/discharge port 2b opened in the pressurized fluid guide surface 2a. a fixed shaft 2, an inner pressurizing cylinder 3 made of a flexible elastic material (for example, neoprene rubber, urethane resin, etc.) that fits around the pressurized fluid guide surface 2a of the fixed shaft 2; A raw material is filled between a mold 4 made of a flexible elastic material (for example, neoprene rubber, urethane resin, etc.) fitted onto the pressure cylinder 3 and the mold 4 which is placed outside the inner pressure cylinder 3. A rigid outer pressure receiving device 5 that forms a space A is provided. The internal pressure rubber press device 1 supplies a pressure P (for example, , P-500
~5,0OOk110II) of pressurized fluid 7 (for example, oil, glycerin, hydrochloric acid, air, etc.) is supplied to inflate the inner pressurized cylinder 3 and mold 4 (see 2 points tlIm in the figure). Then, the raw material S made of ceramic powder etc. that has already been supplied to the raw material filling space A is transferred from the inside to the outside pressure receiving tool 5.
Pressure molding is performed by pressing toward the inner circumferential surface 5a of. and,
Internal pressure rubber press equipment! ! 1, when a predetermined pressure molding time has elapsed, the pressurized fluid 1 in the pressurized chamber 6 is discharged from the pressurized fluid supply/discharge port 3, and the inner pressurized cylinder 3 and mold 4 is elastically returned to its original shape, the holder 8 and lid 9 screwed onto the outer pressure receiving tool 5 are removed, and the molded product (not shown) is extracted from the raw material filling space A.

[Problems to be solved by the invention]

However, molded products that are pressure-molded using high-pressure pressurized fluid 7,
Even if the pressurized fluid 1 is discharged and becomes unpressurized, the inner circumferential surface 5 of the outer pressure receiving device 5 may be damaged due to the residual stress generated inside it.
Maintain a state of tight contact with a. Therefore, in the conventional internal pressure rubber press device 1, it is very difficult to extract the molded product from the inside of the outer pressure receiving tool 5, and the molded product may be damaged. Further, in the conventional internal pressure rubber press device 1, it is necessary to extract the molded product that is in close contact with the inner peripheral surface 5a of the outer pressure receiving tool 5, so it is impossible to form an uneven surface on the inner peripheral surface 5a of the outer pressure receiving tool 5. However, only molded products with a flat outer fitting surface can be molded.

[Purpose of the invention]

In view of the above-mentioned problems, the present invention provides an internal pressure rubber that allows the molded product to be removed from the raw material filling space extremely easily without causing any damage, and also enables pressure molding of the molded product having an uneven outer circumferential surface. The purpose is to provide press equipment.

[Means to solve the problem]

The gist of the present invention is to provide a fixed shaft having a pressurized fluid guide surface formed on its outer peripheral surface and a first pressurized fluid supply/discharge port opened in the pressurized fluid guide surface, and a pressurized fluid guide of the fixed shaft. An internal pressure device comprising a flexible inner pressurizing cylinder whose surface is fitted onto the outside, and an outer pressure receiver disposed outside the inner pressurizing cylinder and forming a raw material filling space between the inner pressurizing cylinder and the inner pressurizing cylinder. In the rubber press equipment,
The outer pressure receiving device is made of a material with high rigidity and has a divided rigid type in which a plurality of circumferentially divided pieces are connected to form an outer peripheral wall surface of the raw material filling space, and a divided rigid type that backs up the outer peripheral surface of the raw material filling space. and a flexible outer pressurizing cylinder having a pressurized fluid pressure receiving surface formed on its outer circumferential surface, and a second pressurizing cylinder having a pressurized fluid guiding surface that fits around the outer pressurizing cylinder and is formed on its inner circumferential surface. A holding case having a pressurized fluid supply/discharge port is provided. (Function 1) In the split rigid type, a predetermined pressure is applied from the first pressurized fluid outlet and the second pressurized fluid supply/discharge port, respectively, so that the shape of the cylindrical body in which a plurality of divided pieces are connected is maintained. When the pressurized fluid is supplied, its outer circumferential surface is tightened by the outer pressurizing cylinder, and its inner circumferential surface is pressed through the pressurized raw material. Pressurization by the pressurized fluid for a predetermined period of time When the pressurized fluid is discharged after the elapse of time, the split rigid type releases the tightening of the outer pressurizing cylinder against the outer circumferential surface, and the inner circumferential surface is pressed by the residual stress generated in the molded product. The joint state of the divided pieces is released and the diameter of the molded product is expanded.As the diameter of the divided rigid mold increases, the pressing force against the inner circumferential surface of the v1 rigid mold disappears or becomes very small. It is very easy to extract the raw material from the filling space. [Explanation of Examples] Next, an internal pressure rubber press apparatus M according to the present invention (hereinafter referred to as "the apparatus of the present invention") will be described based on an example shown in the drawings. (First Actual Drop Example) Figures 14 and 5 show the device 11 of the present invention of the first embodiment.Outer pressure receiving tool 15 which is an improved part of the device 11 of the present invention
The structure except for is the same as that shown in FIG. 13, and the same reference numerals indicate the same members. The outer pressure receiving tool 15 includes a divided rigid type 17 in which the outer peripheral wall surface of the raw material filling space A is formed by an inner peripheral surface 17a, and a divided rigid type 1.
A flexible outer pressure member 18 backing up the outer circumferential surface 17b of 7 and a holding case 1 into which the outer pressure cylinder 18 is fitted.
9. The glJ machinability mold 17 is made of a material with high rigidity (for example, steel, aluminum, or high-hardness synthetic material) and has an appropriate wall thickness T (for example, T-3 to 10 mm), and is A plurality of divided pieces 1B, 16° 16 are connected, and the separated end surfaces 16a of each divided piece 16 are formed along the axial direction of the fixed shaft 2. In addition, the split rigid mold 17 may be formed into a cylindrical body having an appropriate cross-sectional shape such as a square cylinder or a triangular cylinder corresponding to the three-dimensional shape of the molding object, although not shown in the drawings. At the same time, the inner circumferential surface 17a is not only a smooth surface but also has an appropriately shaped uneven surface such as a satin surface. Furthermore, although not shown in the drawings, the split rigid type 17 has a built-in coil spring for forced separation at an appropriate location between the opposing separation end surfaces 16a and 16c of the adjacent split pieces 16.16, and Of course, it is also possible to configure the diameter to be expanded automatically when the backup is canceled. Furthermore, in addition to fitting the splitting agent mold 17 into the inner recess of the holding case 19, it is also possible to arrange it between the upper lid 9 and the lower lid 10, although not shown. It is. The outer pressure cylinder 18 is made of a flexible elastic material (for example,
(neobrene rubber, urethane resin, etc.), and its upper and lower ends are held in a watertight state by a holding case 19. The outer pressurized cylinder 18 has a pressurized fluid guide 18a formed on its outer peripheral surface, and forms a fluid introduction space 2o between it and the pressurized fluid guide surface 19a of the holding case 19. Although not shown in the drawings, the outer pressurizing cylinder 18 may have a protective cylinder formed of a flexible elastic material fitted into the inner circumferential surface 18b as necessary. The holding case 19 is formed into a rigid body, and has second pressurized fluid supply/discharge ports 19b and 19c opened on a pressurized fluid guide surface 19a. In this embodiment, only one pressurizing tool having an inner pressurizing cylinder 3 fitted onto a fixed shaft 2 is arranged in a cylindrical shape, but the present invention is not limited to this in any way. Although not shown in the drawings, it is of course possible to arrange an appropriate number of inner pressurizing cylinders 3 whose outer peripheral surface has an appropriate cross-sectional shape such as a polygon or an ellipse. A pressurized fluid supply and discharge device 30 for supplying and discharging pressurized fluid 7 made of oil to and from the device W111 of the present invention will be described based on an embodiment shown in FIG. The pressurized fluid supply/discharge device 30 is the fluid supply device 5
6, a high/low pressure branching device 57, and a drain pipe 58. The low pressure pump 31 and the booth pump 32 that constitute the fluid supply device 56 have a suction port 31a in the oil tank 33,
32a is facing me. Discharge port 31 of low pressure pump 31
b is connected to a main fluid pipe 35 via a check valve 34. A pressure switch 36 and a relief pulse 37 are connected between the discharge port 31b of the low pressure pump 31 and the check valve 34. The discharge port 32b of the booth pump 32 is connected to the inlet 38a of the boost cylinder 38 and the relief valve 40. A discharge port 38b of the boost cylinder 38 is connected to the main fluid pipe 35 via a check valve 41. A pressure switch 42 is connected between the discharge port 38b of the boost cylinder 38 and the check valve 41. The operation circuit 43 that starts and stops the low pressure pump 31 and the booth pump 32 starts only the initial pressurization pump 31 until the initial pressure setting pressure switch 36 outputs a set pressure detection signal, and the pressure switch 36 outputs the initial pressure setting pressure detection signal. When the set pressure detection signal is received, the initial pressurization pump 3
1 and starts the booth pump 32. Further, the operation circuit 43 starts the booth pump 32 until the pressure switch 42 for high pressure setting outputs a setting detection signal, and starts the booth pump 32 when the pressure switch 42 receives the setting pressure detection signal. make it stop. A liquid level detection switch 60 is arranged in the oil tank 33. The high and low pressure branching device 57 includes a high pressure supply pipe 45 connected to the main fluid pipe 35 via a check valve 44, and a low pressure supply pipe 47 connected to the main fluid pipe 35 via a check valve 44 and a flow adjustment valve 46. and a height differential pressure guarantee device 48. The pressure differential guarantee device 48 includes a pressure switch 49 connected to the high pressure supply pipe 45, a pressure switch 50 connected to the low pressure supply pipe 47, and a relief valve 59 connected to the low pressure supply pipe 47. An operating circuit that inputs the differential pressure ΔP between the detected pressures of the pressure switches 49 and 50 as a detected differential pressure signal a, and outputs an operating signal for increasing or decreasing pressure to the relief valve 50 until the detected differential pressure ΔP reaches the set differential pressure. It consists of 51. The high pressure supply pipe 45 is connected to the fixed shaft 2 via a valve 53.
The first pressurized fluid supply/discharge port 2b is connected to the first pressurized fluid supply/discharge port 2b. The low pressure supply pipe 47 is connected to the second pressurized fluid supply/discharge port 19b of the holding case 19 via a valve 52. A drain pipe 58 communicating with the oil tank 33 has valves 54 at each of the first pressurized fluid supply/discharge port 2b and the second pressurized fluid supply/discharge port 19c.
．． 55. Next, the operation of the device 11 of the present invention will be explained using the pressurized fluid supply and discharge device 30.
This will be explained along with the operation. First, as shown in FIG. 1, the fixed shaft 2 is inserted into the holding case 19, and the divided pieces 16.16.1
The raw material S is filled into the raw material filling space A formed between the split rigid mold 17 formed by connecting the molds 6 and the mold 4. Then, the lid 9 is fitted onto the shoulder portion 2C of the fixed shaft 2 to cover the raw material filling space A8, and the holder 8 is screwed onto the holding case 19 to complete the preparation. Next, as shown in FIG. 2 to the first pressurized fluid supply/discharge port 2b of the holding case 19, and the second pressurized fluid supply/discharge port 1 of the holding case 19 via the low pressure supply pipe 41.
9b. First pressurized fluid supply/discharge port 2b of fixed shaft 2
The high-pressure pressurized fluid 7a supplied to presses the inner circumferential portion 3a of the inner pressurizing cylinder 3 to expand its diameter as the supply amount increases,
The raw material S is pressurized through the mold 4. Holding case 19
The low pressure pressurized fluid 7b supplied to the second pressurized fluid supply/discharge port 19b is introduced into the fluid introduction space 20 and presses the pressurized fluid receiving surface 18a of the outer pressurized cylinder 18. The pressed outer pressure cylinder 18 tightens the outer circumferential surface 17b of the divided rigid mold 17, and the divided pieces 16, 16 .
16 (see FIG. 2), respectively opposing separated end surfaces 16a, 1
6a Bring the comrades into close contact. The pressure difference ΔP between the high-pressure fluid 7b and the low-pressure pressurized fluid 7b is determined by the opposing separation end surfaces 16a of the divided pieces 16, 16, and 16 constituting the divided rigid mold 17.
, 16a are brought into close contact with each other, and the pressure is set to a pressure that does not cause extreme deformation or destruction of the split rigid mold 17. After the predetermined pressurization time has elapsed, the pressurized fluid 7a,
7b is discharged while reducing the pressure. The pressure reduction of the pressurized fluids 7a and 7b is performed so as to maintain close contact between the opposing separated end surfaces 16a and 16a of the divided pieces 16 and 16.16, respectively.
This is performed while maintaining a predetermined pressure difference ΔP. The inner pressure cylinder 3 and the mold 4 automatically elastically return to their original shapes as the pressure of the pressurized fluid 7a is reduced. When the pressure of the pressurized fluids 7a and 7b supplied to the device 11 of the present invention becomes zero, the divided rigid mold 17 receives the residual stress of the molded product 10 on the inner peripheral surface 17a, and the divided molds 16, 113
The opposing end faces 16a, 16a of 16° are slightly expanded in diameter so as to be separated from each other, and the close contact with the molded product 10 is cut off. Finally, as shown in FIG. 4, the holder 8 and lid 9 screwed onto the holding case 19 are removed, and the molded product 10 is removed from the raw material filling space A. The molded product 10 can be handled smoothly without any damage to the molded product 10 because the molded product 10 and the split rigid die 17 are not in close contact with each other. (Second Embodiment) FIGS. 5 to 7 show an apparatus 61 of the present invention according to a second embodiment. The device of the present invention @61 is a raw material S filled in a raw material filling space A.
By temporally increasing the initial pressurization from a local part (for example, a region near the center) of the raw material filling space A toward the upper and lower ends of the raw material filling space A, molding defects contained in the original nS can be removed. By squeezing objects (for example, air when the raw material S is powder, or moisture when the raw material S is kneaded soil) into the upper and lower ends of the raw material filling space A, the obstructions are completely eliminated, and the long This allows molded products to be pressure molded. The present invention device 61 differs from the present invention device 11 of the first embodiment in the inner pressurizing cylinder 63. The inner pressurizing cylinder 63 has an inner circumferential surface 63a in close contact with the pressurized fluid guide surface 2a of the fixed shaft 2, as shown in FIG. 5 with the left half omitted. The inner pressure cylinder 63 is made of a flexible elastic material (for example, neoprene rubber, urethane resin, etc.), and its hardness is appropriately selected within the JIS rubber hardness range of 40 to 90 degrees. An appropriate local area located between the ends is defined as the initial pressurizing area 63a-1. The fixed shaft 2 has a first pressurized fluid outlet 2b opened at a portion facing the initial pressurizing area 133a-1 of the inner pressurizing cylinder 63. Seal structure 64 near the upper and lower ends of the inner pressurizing cylinder 63
As shown in FIG. 7, the end edge 63C of the inner pressurizing cylinder 63 is fitted into the annular groove 65 formed in the fixed shaft 2, and the inner circumferential surface 63a side of the end edge 63c is A seal ring fitting groove 66 is recessed in the seal ring fitting groove 66, and the seal ring 67 fitted in the seal ring fitting groove 66 is brought into close contact with the inner circumferential surface 65a of the annular groove 65, and the inner deep part 65b of the annular groove 65 is at the end. This serves as a backup portion for the edge 63c. The seal ring 67 is not limited to one having a zero cross section, but may be appropriately selected from those having a cross section such as a V shape or an X shape. Next, the operation of the device 61 of the present invention in the second embodiment will be explained based on its usage. High-pressure pressurized fluid 7a is supplied from the pressurized fluid supply/discharge device 30 (see FIG. 3) to the first pressurized fluid supply/discharge port 2b of the fixed shaft 2, and low-pressure pressurized fluid 7b is supplied to the first pressurized fluid supply/discharge port 2b of the fixed shaft 2.
is supplied to the second pressurized fluid supply/discharge port 19b of the holding case 19. The low pressure pressurized fluid 7b supplied to the second pressurized fluid supply/discharge port 19b of the holding case 19 is introduced into the fluid introduction space 20 and presses the pressurized fluid receiving surface 18a of the outer pressurized cylinder 18. . The pressed outer pressure unit 18 is divided into rigid type 1
The outer circumferential surfaces 17b of the split rigid die 17 are tightened to bring the opposing separated end surfaces 16a and lea of the split pieces 16, 16.16 (see FIG. 2) of the split rigid mold 17 into close contact. The pressure difference ΔP between the high-pressure fluid 7a and the low-pressure pressurized fluid 7b is sufficient to bring the opposing separated end surfaces 16a, 16a of the divided pieces 16, 16, and 16 constituting the divided rigid mold 17 into close contact with each other. The pressure is set at a pressure that does not cause extreme deformation or destruction of the split rigid mold 17. When the high-pressure pressurized fluid 1a supplied to the first pressurized fluid supply port 2b of the fixed shaft 2 reaches a predetermined pressure (for example, 50 to 200 to 9/Crj), it reaches the initial pressurization region! ! By pressing only 63a-1, initial pressurization lfi 63a-1 is expanded and deformed inward, as shown in FIG. The mold 4 is the initial pressure area 1 of the inner pressure cylinder 63.
Only the outer peripheral surface 4a of the area facing i1.63a-1 is pressed, the mold inner diameter is reduced, and the raw material S is pressurized. The forming obstruction (not shown) in the pressurized raw material S is
As the pressure against the obstruction increases, it will rapidly flow out into the discharge passage formed by the large particle gaps in the unpressurized raw material, and will not remain in a compressed state in the pressurized raw material S. do not have. As the supply amount of the pressurized fluid 7 increases, the initial area bll 63a-1 of the inner pressurizing cylinder 63 increases.
, and the expansion deformation of this next pressurizing area is gradually expanded toward the upper and lower ends of the inner pressurizing cylinder 63. The raw material S filled in the raw material filling space A is then transferred to the initial pressurized area 63a of the inner pressurized cylinder 63.
-1 is sequentially pressurized from the area in the raw material filling space A toward the upper and lower ends. Molding obstacles present in the raw material S filled in the raw material filling space A are removed from the initial region 63a-1 of the inner pressurizing cylinder 63 as the raw material S is sequentially pressurized.
The material is squeezed toward the upper and lower ends from the area in the raw material filling space A that faces the raw material filling space A. As a result, no compressed air or excess moisture remains in the pressurized raw material S, which is a molding obstacle that could cause damage to the molded product. The pressurized liquid 7a supplied between the entire inner circumferential surface 63a of the inner pressurized cylinder 63 and the pressurized fluid guide surface 2a of the fixed shaft 2 is further heated to a predetermined pressure (for example, 500 to 5,0OOk+1/cd). ), and the raw material S is pressure-molded. After a predetermined pressurization time has elapsed, the pressurized fluids 7a and 7b are discharged while being reduced in pressure. The pressure of the pressurized fluids 7a and 7b is reduced by the divided pieces 16,
16, 16 (refer to the second factor), respectively opposing separated end surfaces 1
This is done while maintaining a predetermined differential pressure ΔP so as to maintain close contact between 6a and 16a. Inner pressure cylinder 6
3 and the mold 4 automatically elastically return to their original shapes as the pressure of the pressurized fluid 1a is reduced. When the pressure of the pressurized fluids 7a and 7b supplied to the device 61 of the present invention is reduced to a predetermined pressure, the molded product is extracted from the raw material filling space A, as in the first embodiment. To extract this molded product,
Since the molded product and the split rigid die 17 are not in close contact with each other, the molded product can be smoothly molded without any damage. (Third Embodiment) FIGS. 8 and 9 show an apparatus 71 of the present invention according to a third embodiment. The apparatus 71 of the present invention applies initial pressure to the raw material S filled in the raw material filling space A from a local part (for example, a region near the center) of the raw material filling space A, similar to the apparatus 61 of the present invention of the second embodiment. By temporally sequentially expanding the raw material filling space A toward the upper and lower ends, forming obstacles contained in the raw material S are squeezed toward the upper and lower ends of the raw material filling space A, and the obstacles are completely eliminated. This allows pressure molding of long molded products. The present invention device 71 differs from the present invention device 61 of the second embodiment in the inner pressurizing cylinder 73. As shown in FIG. 8 with the left half omitted, the inner pressure cylinder 73 is made of a flexible elastic material (for example, neoprene rubber, urethane resin, etc.), and its hardness is in accordance with the JIS rubber hardness. 40
The angle is appropriately selected within the range of ~90 degrees. As shown in the ninth prisoner, the outer circumferential surface 73a of the inner pressurizing cylinder 73 is coated at appropriate pitches P (for example, P-10 to P-100) along the longitudinal direction of the outer circumferential surface.
a+m) are provided with annular grooves 73b, 73b... and are divided into seven pressurizing areas 73a-1, 738-2...
, 73a-7 are formed. Any pressurizing area among these plurality of pressurizing areas (for example, the central pressurizing area 73
a-4) is the initial pressurization area. Annular groove 73
b, 73b... are each provided with an elastic seal ring 74.
74... are fitted in a tight fit state. The elastic seal ring 74 is not limited to a zero-shaped cross section, and although not shown, it is of course possible to select a cross-sectional shape having an appropriate shape such as a square shape or an X shape. Inner pressure cylinder 73
As shown in FIG. 8, near the upper and lower ends of the inner circumferential surface 73a,
A seal structure 64°64 (see FIG. 7) is provided. The fixed shaft 2 is connected to the initial pressurizing area Ti17 of the inner pressurizing cylinder 73.
A first pressurized fluid supply/discharge port 2b is opened at a portion facing 3a-4. Note that the number of divisions of the pressurizing area formed on the inner circumferential surface 73a of the inner pressurizing cylinder 73 is not limited to seven as in the illustrated embodiment; It suffices if it is more than division. Next, the operation of the device 71 of the present invention in the third embodiment will be explained based on its usage. High-pressure pressurized fluid 7a is supplied from the pressurized fluid supply/discharge device 30 (see FIG. 3) to the first pressurized fluid supply/discharge port 2b of the fixed shaft 2, and low-pressure pressurized fluid 7b is supplied to the holding case 19. The pressurized fluid is supplied to the second pressurized fluid supply/discharge port 19b. The low-pressure pressurized fluid 7b supplied to the second pressurized fluid supply/discharge port 19b of the holding case 19 is introduced into the fluid introduction space 20 and presses the pressurized fluid receiving surface 18a of the outer pressurized cylinder 18. do. The pressed outer pressure cylinder 18 is divided into rigid type 1
The outer circumferential surface 17b of the split rigid die 17 is tightened to bring the opposing separated end surfaces 16a, 16a of the split pieces 16, 16.16 (see FIG. 2), which constitute the split rigid die 17, into close contact with each other. The high-pressure pressurized fluid 7a supplied to the first pressurized fluid supply port 2b of the fixed shaft 2 is heated to a predetermined pressure (for example, 50 to 200 +3/c
tJ), as shown in Figure 9, the initial pressure area 7
3a-4 is pressed to make the initial pressure area 73a-4 inward into the i-tension shape. The mold 4 is an initial pressurizing area 73a of the inner pressurizing cylinder 73.
Only the outer circumferential surface 4a of the region facing -4 is pressed, the mold inner diameter is reduced, and the raw material S is pressurized. Molding obstacles (not shown) in the pressurized raw material S rapidly flow out into the discharge passage formed by large particle gaps in the unpressurized raw material because the pressure against the molding obstacle increases. , it will not remain in a compressed state in the pressurized raw material S. The diameter m of the initial pressurizing region 73a-4 of the inner pressurizing cylinder 73 increases as the supply amount of the pressurized fluid 7a increases. Initial pressurization area 73a-4 in inner pressurization cylinder 73
As shown in FIG. 9, the annular grooves 73b and 73b formed between the adjacent pressure areas w1.73a-3 and 73a-5 deform outward and expand in diameter. . Annular groove 73
The elastic seal ring 74° 74, which is tightly fitted to the annular enclosures y473b and 73b, increases the inner diameter of the ring as the diameter of the annular enclosures y473b and 73b increases, and the elastic seal ring 74 is tightly fitted to the pressurized fluid guide surface 2a of the fixed shaft 2. A gap is formed between the two and the sealing function is lost. The pressurized fluid 7 is applied to the next pressurizing area 73a-3, 73a adjacent to the initial pressurizing area 73a-4 of the inner pressurizing cylinder 73 due to the loss of the sealing function of the elastic seal rings 74, 74.
-5, and this next pressurization area 73a-3, 73a-
Press 5. In this way, as the supply amount of the high-pressure pressurized fluid 7a increases, the expansion and deformation of the pressurized region is gradually expanded toward the upper and lower ends of the inner pressurizing cylinder 73. The raw material S filled in the raw material filling space A is sequentially pressurized from the region in the raw material filling space A facing the initial pressurizing region 63a-1 of the inner pressurizing cylinder 63 toward the upper and lower ends. I'm going to be done. As the raw material S is sequentially pressurized, the forming obstructions present in the raw material S filled in the raw material filling space A are removed in the raw material filling space A facing the initial region 73a-4 of the inner pressurizing cylinder 73. The area is narrowed toward the upper and lower ends. the result,
In the pressurized raw material S, there is no remaining compressed air or excess moisture, which are obstacles to molding that can cause damage to the molded product. The pressurized liquid 7a supplied between the entire surface of the inner circumferential surface 73a of the inner pressurized cylinder 73 and the pressurized fluid guide surface 2a of the fixed shaft 2 is further heated to a predetermined pressure (for example, 500~s,
The pressure is increased to ooo-/, j), and the raw material S is pressure-molded. After the predetermined pressurization time has elapsed, the pressurized fluid 7a,
7b is discharged while reducing the pressure. The pressure reduction of the pressurized fluids 7a and 7b is performed at a predetermined pressure difference ΔP so as to maintain close contact between the opposing separated end surfaces 16a and 16a of the divided pieces 16 and 16.16 (see FIG. 2). This is done while maintaining the The inner pressure cylinder 73 and the mold 4 contain the pressurized fluid 7
It automatically elastically returns to its original shape as the pressure of a is reduced. When the pressurized fluids 7a and 7b supplied to the apparatus 11 of the present invention are reduced to a predetermined pressure, the molded product is extracted from the raw material filling space A, as in the first embodiment. Since the molded product is not in close contact with the split rigid die 17, the molded product can be removed smoothly without any damage to the molded product. (Fourth Embodiment) FIGS. 10 and 11 show an apparatus 81 of the present invention according to the fourth embodiment.
This shows that. The present invention device 81 is the present invention device 6 of the second and third embodiments.
As in 1.71, the molding obstacles contained in the raw material S were squeezed to the upper and lower ends of the raw material filling space A to completely eliminate the obstacles and enable pressure molding of long molded products. It is something. The present invention device 81 differs from the present invention device 61 of the second embodiment in the inner pressurizing cylinder 83. Inner pressure cylinder 83
is made of a flexible material (for example, neoprene rubber, urethane resin, etc.) and is covered with a core material layer 84. It is coated with a layer as. The core material layer 84 is formed by separately forming ring materials 84a, 84b-84i of appropriate length, for example, -10 to 100ffi+a), arranged in a line with their respective end surfaces in contact with each other. be. Each ring material 84a, 84b...841 is a center ring material 84e.
As it goes toward the upper and lower ring members 84a and 84i,
The elastic modulus increases step by step. To obtain the desired elastic modulus, ring materials 84a, 84b...8
This is generally carried out by appropriately selecting a rubber hardness of 41 degrees (for example, JIS rubber hardness of 40 to 90 degrees). The inner circumferential surface 83a of the inner pressurizing cylinder 83 is divided into nine pressurizing areas 83-1, 83-2...83-9, and the central pressurizing area 83-5 is the initial pressurizing area. shall be. The fixed shaft 2 has an outer circumferential surface that closely contacts the inner circumferential surface 83a of the inner pressurizing cylinder 83 and is formed as a pressurized fluid guide surface 2a. The pressurized fluid guide surface 2a of the fixed shaft 2 includes a first pressurizing area 83-5 of the inner pressurizing cylinder 83 at a portion facing the initial pressurizing area 83-5.
The pressurized fluid supply/discharge port 2b is opened. The number of divisions of the pressurizing area formed in the inner pressurizing cylinder 83 is not limited to nine as in the illustrated embodiment, but may be two or more. Next, the operation of the bag fi81 of the present invention in the fourth embodiment will be explained. High-pressure pressurized fluid 7a is supplied from the pressurized fluid supply/discharge device 30 (see FIG. 3) to the first pressurized fluid supply/discharge port 2b of the fixed shaft 2, and low-pressure pressurized fluid 7b is supplied to the holding case 1.
9 is supplied to the second pressurized fluid supply/discharge port 19b. The low pressure pressurized fluid 7b supplied to the second pressurized fluid supply/discharge port 19b of the holding case 19 is introduced into the fluid introduction space 20 and presses the pressurized fluid receiving surface 18a of the outer pressurized cylinder 18. . The pressed outer pressure cylinder 18 is pressed against the outer circumferential surface 17 of the split rigid mold 17.
b is tightened to form the divided rigid mold 17,
16.16 (see Figure 2), respectively opposing separated end surfaces 1
6a and 16a are brought into close contact. The low pressure pressurized fluid 7a (for example, 9/c+j from 50 to 200) supplied to the first Katsu fluid supply port 2b of the fixed shaft 2 is as shown in FIG. 11 (8).
As shown in the figure, only the initial pressurized area 83-5 is pressed to expand and deform the initial pressurized area 83-5 inward. The reason for this is that the initial pressurization area 83-5 easily deforms because the elastic modulus of the initial pressurization area 83-5 is smaller than that of the adjacent pressurization area 83-4.83-6. It is. The mold 4 has an initial pressurizing area 83- of the inner pressurizing cylinder 83.
Only the inner circumferential surface 4a in the region facing the mold 5 is pressed, increasing the mold inner diameter and pressurizing the raw material S. Pressurized raw material S
Molding obstructions (not shown) in the pressurized raw material flow out rapidly into the discharge passage formed by large particle gaps in the unpressurized raw material due to the increase in pressure against the molding obstruction, and the pressurized raw material It does not remain in S. Inner pressure cylinder 83
As the supply pressure of the pressurized fluid 7a increases, the next pressurization area 83-4.8 adjacent to the initial pressurization area 83-5 increases.
The pressurized fluid 1a flows out to 3-6, and this next pressurized area 83
-4. Press 83-6. Note that the pressure of the pressurized fluid 7a increases when pressurizing the next pressurizing area 83-4, 83-6, than when pressurizing only the initial pressurizing area 83-5 of the inner pressurizing cylinder 83. do. Due to the phenomenon of increased pressure,
The raw material S that was initially pressurized in the central region is further pressurized. This phenomenon of increase in pressurizing force also discharges minute molding obstacles remaining in the initially pressurized raw material S, making the obstacle elimination complete. As the pressure of the pressurized fluid 1a increases, the expansion and deformation of the next pressurizing region is gradually expanded toward the upper and lower ends of the inner pressurizing cylinder 83. The raw material S filled in the raw material filling space A is transferred to the inner pressurized cylinder 83.
Raw material filling space A facing the initial pressurization area it 83-5
The forming obstructions present in the raw material S filled in the raw material filling space A, which is sequentially pressurized from the inner region toward the end, are removed from the inner pressurizing cylinder as the raw material S is sequentially pressurized. The material is squeezed from the area in the raw material filling space A that faces the initial area 83-5 of the body 83 toward the end. As a result, no molding obstructions that could cause damage to the molded product remain in the pressurized raw material S. Inner peripheral surface 8 of inner pressurizing cylinder 83
The pressurized liquid 7a supplied between the entire surface of 3a and the pressurized fluid guide surface 2a of the fixed shaft 2 is further heated to a predetermined pressure (for example, 50
The pressure is increased to 0 to 5.000 h/car), and the raw material S is pressure-molded. Once the predetermined pressurization time has elapsed,
The pressurized fluids 7a and 7b are discharged while being reduced in pressure. The pressure reduction of the pressurized fluids 7a, 7b is carried out while maintaining a predetermined pressure difference ΔP so as to maintain close contact between the opposing separated end surfaces 16a, 16a of the divided pieces 16, 16.16. . The inner pressure cylinder 13 and the mold 4 automatically elastically return to their original shapes as the pressure of the pressurized fluid 7a is reduced. Inventive device! When the pressure of the pressurized fluid 7 supplied to the 81 is reduced to a predetermined pressure, the split rigid mold 17
7a receives the residual stress of the molded product, and the split molds 16, 16.
16, the opposing end faces 16a, 16a are slightly expanded in diameter so as to be separated from each other, and the close contact with the molded product is cut off. Finally, the holder 8 and the lid 9 screwed onto the holding case 19 are removed, and the molded product is extracted from the raw material filling space A. The molded product is extracted from the molded product and the split rigid mold 17.
Since the close contact with the molded product 10 is cut off, the molded product 10 can be smoothly molded without any damage. (Fifth Embodiment) FIG. 12 shows an apparatus 91 of the present invention according to a fifth embodiment. The apparatus of the present invention 1t91 squeezes the forming obstacles contained in the raw material S to the upper and lower ends of the raw material filling space A, similar to the apparatus of the present invention [61, 71, 81 of the 2.3.4 embodiment]. This completely eliminates obstacles and enables pressure molding of long molded products. The present invention device 91 differs from the present invention device 61 of the second embodiment in the inner pressurizing cylinder 93. Inner pressure cylinder 93
As a result, the inner pressurizing cylinder 73 of the third embodiment and the inner pressurizing cylinder 83 of the fourth embodiment are combined. That is, the inner pressurizing cylinder 93 is made of core material W!
The elastic modulus of J94 is made to increase stepwise from the center ring material 94e toward the upper and lower ring members 94a, 94t, and annular grooves 93b, 93b...・ is recessed and an elastic seal ring 74 is fitted into each annular groove 93b.
4 is brought into close contact with the pressurized fluid guide surface 2a of the fixed shaft 2. A first pressurized fluid supply/discharge port 2b is opened in the pressurized fluid guide surface 2a of the fixed shaft 2 at a portion facing the ring material 94e in which the core material layer 94 has a small elastic modulus. [Effects of the Present Invention] As detailed above, the apparatus of the present invention has the following excellent effects. ■ For the split rigid type, when the outer pressure cylinder is unfastened from the outer circumferential surface, the inner circumferential surface is pressed by the residual stress generated in the molded product, and the pressing force against the inner circumferential surface of the split rigid type is increased. Expand the diameter until it disappears or becomes very small. As a result, it becomes possible to recover the molded product without causing any damage, and the yield can be dramatically improved compared to the conventional method. (2) Since it is possible to expand the diameter of the split rigid mold to a state where there is no problem with demolding the molded product, it is possible to pressure mold a molded product with an uneven outer peripheral surface. As a result, the range of application of internal pressure rubber molding becomes wider than that of the conventional method.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the device of the present invention, in which FIG. 1 is a longitudinal sectional view, and FIG. 2 is a vertical sectional view of FIG. 1.
Figure 3 is a cross-sectional view taken along line ■, and the left side of the figure shows a vertical cross section in the middle of pressurized formation, and the right side is a schematic diagram of the pressurized fluid supply and discharge device. 5 to 7 are longitudinal cross-sectional views showing the mold state, and FIG. 5 is a longitudinal cross-sectional view showing the second embodiment of the present invention apparatus, FIG. The figure is an enlarged sectional view showing the main part in the initial pressurized state, FIG. 7 is an enlarged sectional view showing the seal structure of the inner pressurizing cylinder, and FIGS. 8 is a vertical sectional view with the left half omitted, FIG. 9 (8) is an enlarged sectional view of the main part showing the first stage of the initial pressurized state, and FIG. 03] is an enlarged cross-sectional view of the main part showing the second stage of the initial pressurization state, and FIGS. 10 and 11 show the fourth embodiment of the device of the present invention, with the left half of FIG. Prisoner 11 is an enlarged cross-sectional view of the main part showing the first stage of the initial pressurized state, Figure 11 is an enlarged cross-sectional view of the main part showing the second stage of the initial pressurized state, Prisoner 12 The figure is a longitudinal cross-sectional view of a fifth practical example of the apparatus of the present invention, with the left side omitted, and FIG. 13 is a longitudinal cross-sectional view of a conventional internal pressure rubber press apparatus. A... Raw material filling space 2... Fixed shaft 3 (6
3, 73, 83, 93)...Inner pressure cylinder 16...
Divided piece 17...Divided rigid type 2b...
・First pressurized fluid supply/discharge port 190...Second pressurized fluid supply/discharge port Patent applicant: Kirikai Matsushita Agent, Patent attorney, Inax Co., Ltd. 1) Toshihiko, Figure 2, Figure 13

Claims (1)

[Claims] 1. A fixed shaft having a pressurized fluid guide surface formed on its outer peripheral surface and a first pressurized fluid supply/discharge port opened in the pressurized fluid guide surface, and pressurization of the fixed shaft. It includes a flexible inner pressurizing cylinder into which a fluid guide surface is fitted, and an outer pressure receiver disposed outside the inner pressurizing cylinder and forming a raw material filling space between the inner pressurizing cylinder and the flexible inner pressurizing cylinder. In the internal pressure rubber press device, the outer pressure-receiving tool is made of a material with high rigidity and has a split rigid type in which a plurality of pieces divided in the circumferential direction are connected to form an outer peripheral wall surface of the raw material filling space; A flexible outer pressurizing cylinder that backs up the rigid outer peripheral surface and has a pressurized fluid pressure receiving surface formed on the outer peripheral surface, and a pressurizing cylinder that fits the outer pressurizing cylinder and is formed on the inner peripheral surface. An internal pressure rubber press device comprising: a holding case having a second pressurized fluid supply/discharge port opened on a fluid guide surface. 2. The internal pressure rubber press device according to claim 1, comprising a plurality of said fixed shafts. 3. The inner peripheral surface of the inner pressurized cylinder is in close contact with the pressurized fluid guide surface of the fixed shaft, and the first pressurized fluid supply/discharge port is located between both ends of the pressurized fluid guide surface. An internal pressure rubber press device according to claim 1 or 2, which is located in a suitable local area. 4. The inner circumferential surface of the inner pressure cylinder is divided into a plurality of pressure areas by a plurality of annular grooves recessed at appropriate intervals in the axial direction of the inner pressure cylinder; One pressurizing area selected from among the pressurizing areas is set as the initial pressurizing area, and a plurality of pressurizing areas are fitted into each of the annular grooves and are in close contact with the pressurized fluid guide surface of the fixed shaft. 3. The internal pressure rubber press device according to claim 1, wherein the first pressurized fluid supply/discharge port is located at a portion facing the initial pressurization area. 5. In the inner pressurizing cylinder, an appropriate local area located between both ends of the inner pressurizing cylinder is set as an initial pressurizing area, and the elastic modulus of the cylinder wall constituent material increases from the initial pressurizing area to the inner side. The first pressurized fluid supply/discharge port is configured to increase in size continuously or stepwise toward the end of the pressurized cylinder, and the first pressurized fluid supply/discharge port is located at a location opposite to the initial pressurization area. The internal pressure rubber press device according to item 1 or 2. 6. The inner circumferential surface of the inner pressurizing cylinder is divided into a plurality of pressurizing areas by a plurality of annular grooves recessed at appropriate intervals in the axial direction of the inner pressurizing cylinder; One pressurizing area selected from among the pressurizing areas is set as the initial pressurizing area, and a plurality of pressurizing areas are fitted into each of the annular grooves and are in close contact with the pressurized fluid guide surface of the fixed shaft. furthermore, the elastic modulus of the cylinder wall component increases continuously or stepwise as it goes from the initial pressurizing area toward the end of the inner pressurizing cylinder; The internal pressure rubber press device according to claim 1 or 2, wherein the pressure fluid supply/discharge port is located at a portion facing the initial pressurization area.