JP2010064076A - Piston type isostatic pressing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piston type isostatic pressing apparatus by which the object to be treated is subjected to isostatic pressing treatment by the compression of a pressure medium in a pressure vessel, wherein core adjustment and the lubrication of a seal part are easily performed when the piston is inserted into the pressure vessel. <P>SOLUTION: In the piston type isostatic pressing apparatus where a piston 3 is inserted into a pressure vessel 1 by the elongation of a pressure piston 6 in a pressure cylinder 5, and the object to be treated is subjected to isostatic pressing treatment, the pressure piston 6 and the piston 3 are freely adhered/separated, the piston 3 is supported so as to allow displacement for the shaft core adjustment of the piston 3 via a piston holder 7, the inside of the piston holder 7 is provided with a weight supporting means 10 generating opposing force supporting the own weight of the piston 3 in a state where the piston 3 and the pressure piston 6 lie in a non-contacted state, and automatic core adjustment is performed in such a manner that the shaft core C2 of the piston 3 is made coincident with the shaft core C1 of the pressure vessel 1 by the resistance received when the piston 3 is inserted into the pressure vessel 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention inserts a piston linked to a pressure piston into the pressure vessel by extension of the pressure piston in the pressure cylinder, and pressurizes the workpiece with isotropic pressure by compressing the pressure medium in the pressure vessel. Regarding the improvement of the piston type isotropic pressure pressurizing apparatus to be processed, more specifically, the piston type isotropic which improves the core adjustment when the piston is inserted into the pressure vessel and can prevent the piston and the pressure vessel from being seized. The present invention relates to a pressure and pressure device.

  For molding ceramics and metal powders, sterilization and sterilization of foods, or densification of natural materials such as bamboo and wood, a piston linked to a pressure piston is inserted into the pressure vessel, and the pressure medium in the pressure vessel is A piston type isotropic pressure pressurizing apparatus is used that compresses and pressurizes the object to be processed accommodated in the pressure vessel with isotropic pressure.

  In such a piston type isotropic pressure pressurizing device, when the piston is inserted into the pressure vessel, there is a problem that the sliding portion is seized due to poor alignment (alignment) between the two. . First, a conventional piston type isotropic pressure pressurizing apparatus for solving such problems will be described with reference to FIG. FIG. 6 shows an embodiment of a piston type isotropic pressure pressurizing device according to a conventional example. FIG. 6 (a) is a vertical sectional view of the pressurizing process, and FIG.

  The piston type isotropic pressure pressurizing device according to this conventional example inserts a pressurizing cylinder piston 33 into a pressure vessel 30 and applies an object to be processed at an isotropic pressure through compression of a fluid in the pressure vessel 30. A press frame 34 that carries out pressure treatment and carries axial reaction force accompanying pressurization is provided. The piston of the pressurizing cylinder piston 33 includes a movable piston 31 that is inserted into the pressure vessel 30 so as to be movable in the container axial direction, and a pressurizing piston 33A that pressurizes the movable piston 31. , 33A can be joined and separated (see Patent Document 1).

  According to the piston type isotropic pressure pressurizing device according to this conventional example, since the piston is divided into the movable piston 31 and the pressurizing piston 33A, the joint between the pistons 31 and 33A has a degree of freedom ( If there is play, the core is easily adjusted when the movable piston 31 slides in the pressure vessel 30, and seizure of the sliding portion can be prevented.

  However, in the above conventional example, the movable piston 31 slides and pressurizes the inside of the pressure vessel 30, so that the sliding stroke becomes long and lubrication is performed to prevent seizure between the seal portion and the inner wall of the pressure vessel 30. (It is desirable to lubricate the movable piston every reciprocation or every multiple reciprocations.) In order to lubricate the seal portion, it is necessary to completely remove the seal portion from the opening of the container 30. In this case, in the structure according to the conventional example, the piston is attached to the pressure vessel 30 as shown in FIG. The arrangement on the lower side is inefficient because it is necessary to completely remove the fluid inside the container 30 every time the seal portion is lubricated.

  Even if the piston is disposed on the upper side of the pressure vessel 30, a mechanism for stably connecting the movable piston 31 and the pressurizing cylinder piston 33 is required, and the structure becomes complicated. In addition, by providing such a mechanism on the contact surfaces of the pistons 31 and 33A, the effective contact area is reduced. When the operating pressure is high, the contact surface pressure is increased, resulting in an unreasonable structure. This problem is the same even when the piston is arranged above the pressure vessel 30.

As the operating pressure increases, the compression ratio of the pressure medium increases, so the sliding stroke of the piston tends to become longer (that is, lubrication of the seal portion becomes important), and in reality, the structure becomes increasingly difficult to adopt. .
JP 7-164194 A

  Accordingly, an object of the present invention is to insert a piston that is linked to the pressure piston by extension of the pressure piston in the pressure cylinder into the pressure vessel, and compress the pressure medium in the pressure vessel to make the object to be processed isotropic. To provide a piston type isotropic pressure pressurizing apparatus that performs easy pressure adjustment and seal lubrication when the piston is inserted into a pressure vessel. It is in.

  In order to achieve the above object, the means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 1 of the present invention is to press the piston interlocked with the pressurizing piston by extension of the pressurizing piston in the pressurizing cylinder. In a piston-type isotropic pressure pressurizing apparatus that is inserted into a container and pressurizes the object to be processed with isotropic pressure through compression of the pressure medium in the pressure container. The piston is supported so as to allow displacement for adjusting the axial center of the piston via the piston holder, and the piston is supported in a state of non-contact with the pressurizing piston. The piston holder is provided with a self-weight support means for generating a reaction force that opposes the self-weight of the piston, and the pressure piston is applied by resistance received when the piston is inserted into the pressure vessel. Piston is in close contact, the axis of said piston is characterized in that formed by self-aligning so as to match the axis of the pressure vessel.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 2 of the present invention is the piston type isotropic pressure pressurizing apparatus according to claim 1, wherein the self-weight support means generates a reaction force by a spring. It is characterized by.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 3 of the present invention is the piston type isotropic pressure pressurizing apparatus according to claim 1 or 2, wherein the piston is in parallel with the self-weight support means. The bearing is supported by a bearing and is rotatable in a non-contact state with the pressure vessel.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 4 of the present invention is the piston type isotropic pressure pressurizing apparatus according to claim 3, wherein the piston is located between the bearing or the bearing. It is characterized in that it has a tapered surface and is in contact with a supporting member interposed between the two.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 5 of the present invention is the piston type isotropic pressure pressurizing apparatus according to claim 3 or 4, wherein the piston is supported by the bearing. In this state, it is automatically rotated by a rotation drive mechanism.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 6 of the present invention is the piston type isotropic pressure pressurizing apparatus according to any one of claims 3 to 5, wherein In order to apply the lubricant to the seal portion of the piston, a horizontally movable lubricant applying means is provided.

  The means adopted by the piston type isotropic pressure pressurizing apparatus according to claim 7 of the present invention is the piston type isotropic pressure pressurizing apparatus according to claim 1 or 2, wherein a lubricant is applied to the seal portion of the piston. Therefore, a lubricant application means that can freely rotate around the seal portion is provided.

  According to the piston type isotropic pressure pressurizing apparatus according to claim 1 of the present invention, the pressurizing piston and the piston can be brought into close contact with each other via the piston holder, and the piston is axially centered through the piston holder. The piston holder includes a self-weight support means that is supported so as to allow displacement for adjustment, and that generates a reaction force that opposes the self-weight of the piston in order to support the piston when the piston is not in contact with the pressure piston. Since it is provided inside, the weight resistance of the piston is reduced by the self-weight support means, and it can be moved finely in the axial direction of the pressure vessel.

for that reason,
The pressure piston and the piston are brought into close contact by the resistance (contact resistance and compression pressure of the pressure medium) received when the piston is inserted into the pressure vessel, and the insertion of the piston into the pressure vessel proceeds. Accordingly, the center adjustment is automatically and reliably performed so that the axis of the piston coincides with the axis of the pressure vessel. As a result, smooth sliding between the piston and the pressure vessel is achieved, and the life of the contact parts and the seal member is improved by preventing seizure of the piston and the pressure vessel.

  Further, in the piston type isotropic pressure pressurizing device according to claim 2 of the present invention, since the self-weight support means generates a reaction force by the spring, a commercially available spring or a device using a spring is used. Thus, a means capable of generating a reaction force that supports the weight of the piston can be easily realized.

  Furthermore, according to the piston type isotropic pressure pressurizing apparatus according to claim 3 of the present invention, the piston is supported by the bearing in parallel with the self-weight support means, and is rotatable in a non-contact state with the pressure vessel. Therefore, the lubricant can be easily applied to the seal portion and inspected.

  Furthermore, according to the piston type isotropic pressure pressurizing device according to claim 4 of the present invention, the piston is brought into contact with the bearing or a support member interposed between the bearing and the bearing. Therefore, when the piston is supported by the bearing, the rotation shaft is stable and freely rotatable, and when the piston is inserted into the pressure vessel, the piston floats due to contact resistance, so that the core is automatically adjusted. Is called.

  According to the piston type isotropic pressure pressurizing device according to claim 5 of the present invention, the piston is automatically rotated by the rotation drive mechanism in a state where the piston is supported by the bearing, and thus provided in the piston. Lubricant application to the seal portion can be performed easily and evenly.

  According to the piston type isotropic pressure pressurizing apparatus according to claim 6 of the present invention, a lubricant applying means that can move horizontally is provided to apply the lubricant to the sealing portion of the rotating piston. Therefore, since the lubricant can be automatically applied to the seal portion, all operations can be automated, and high productivity can be obtained.

  On the other hand, according to the piston type isotropic pressure pressurizing apparatus according to claim 7 of the present invention, in the piston type isotropic pressure pressurizing apparatus according to claim 1 or 2, a lubricant is applied to the seal portion of the piston. Therefore, since the lubricant application means that can rotate and move around the seal portion is provided, the lubricant application of the seal portion can be automatically performed as described above, so that the entire operation can be automated and high. Productivity can be obtained.

  First, a piston type isotropic pressure pressurizing device according to Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is an elevational sectional view for explaining a piston type isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a principal sectional sectional view showing a principal part of FIG.

  1 and 2, the piston type isotropic pressure pressurizing apparatus according to the first embodiment of the present invention has a lower lid 2 detachably attached to a lower opening of a pressure vessel 1, and the lower lid 2 is a pedestal. 21 is fixedly supported. The upper opening of the pressure vessel 1 is configured to be opened or sealed as will be described later by the piston 3, and a workpiece (not shown) is accommodated or taken out from the upper opening.

  With the lower lid 2 attached to the lower opening of the pressure vessel 1, a pressure medium liquid (hereinafter simply referred to as a pressure medium) 20 is injected up to a predetermined liquid level 20 a, and pressure is applied to the pressure medium 20. And the piston 3 for carrying out the high-pressure process of the said to-be-processed object is attached in the state suspended above the pressure vessel 1. FIG. Then, by the extension of the pressurizing piston 6 in the pressurizing cylinder 5, the piston 3 interlocked with the pressurizing piston 6 is inserted into the pressure vessel 1, and the pressure medium 20 in the pressure vessel 1 is compressed through compression. The object to be processed is configured to be pressurized with an isotropic pressure. Reference numeral 2 a denotes a seal portion attached to the lower lid 2.

  The piston 3 is attached in a separated state via a piston holder 7 fixed to a lower end 6a of a pressure piston 6 of a pressure cylinder 5 that generates pressure. The piston 3 does not have to be integrally configured as shown in FIGS. 1 and 2. For example, as described in the conventional example, the tip portion to which the seal member 3 a is attached is separated, and the high-pressure vessel A structure constrained to 1 may be used.

  The piston 3 is formed to have an upper outer diameter d1 larger than the lower outer diameter d2 with a stepped portion 3b, and on the bearing 9 via a ring-shaped support member 8 that contacts the stepped portion 3b. It is placed and supported. Here, the weight of the piston 3 is supported by the upper surface of the support member 8 and the lower surface of the stepped portion 3b of the piston 3 with the same inclination angle in the centripetal direction (perpendicular to the piston axis C2). It is important that the taper surfaces 3c and 8a are contacted and supported. Further, when the support member 8 is not provided, the upper surface of the bearing 9 and the lower surface of the stepped portion 3b of the piston 3 have a tapered surface that descends with the same inclination angle in the centripetal direction as described above. It is good to be done.

  Even in the configuration as described above, when the piston 3 is not in contact with the pressure vessel 1, the piston 3 is supported by the bearing 9 so that it can rotate freely. In order to further reduce the weight, it is supported in a floating state by its own weight support means 10 made of a spring. The self-weight support means 10 is preferably configured to have a reaction force substantially equivalent to the self-weight of the piston 3, and is supported by the bearing 9 through the support member 8 in such a state.

  In addition, as the self-weight support means 10, in addition to a spring, one provided with any one or a plurality of actuators by rubber pressure or pneumatic pressure, rubber, or magnetic force can be used. Further, a gap S is secured between the piston upper end 3d and the pressure piston lower end 6a in a state in which no load is applied to the piston 3 due to pressure, and the value is determined when the pressure device is pressurized and the pressure is increased. It is appropriately set depending on the concentricity between the axial center C1 of the pressure vessel 1 and the axial center C2 of the piston 3 that can be set.

  By making the configuration as described above, the pressurizing piston 6 and the piston 3 can be brought into close contact with each other, and the piston 3 allows a displacement for adjusting the axis of the piston 3 via the piston holder 7. Supported by The piston 3 is lifted and aligned by the resistance (reaction force) received when the piston 3 is inserted into the pressure vessel 1 by the self-weight support means 10 and the tapered surfaces 3a and 8a. Further, as the piston 3 is inserted into the pressure vessel 1, the piston is inserted along the inner wall of the pressure vessel 1, so that the axis C2 of the piston 3 is the axis C1 of the pressure vessel 1. As a result, it is possible to perform smooth insertion as a result.

  Also, a first gear 12 fitted and fixed to the outer periphery of the piston 3 in the piston honda 7 above the step portion 3b of the piston 3 and a first gear 12 that engages and drives the first gear 12 from the outer periphery. A rotational drive mechanism 11 is constituted by the two gears 13 and a drive motor 14 that rotationally drives the second gear 12. It is important that such a rotational drive mechanism 11 is configured to be able to freely transmit a rotational driving force to the piston 3 and to slide in a direction parallel to the axis C2 of the piston 3.

  And the rotational force by the drive motor 14 is transmitted to the said piston 3 via the 1st gearwheel 12 from the 2nd gearwheel 13 attached to this motor shaft. As such a rotational drive mechanism 11, a pulley and a belt may be used instead of the gears 12 and 13, or an actuator using hydraulic pressure or pneumatic pressure may be used instead of the driving motor 13. Also good.

  On the other hand, the pressurizing piston 6 is configured to be movable up and down by a hydraulic pressure (a drive source is not shown) introduced into the pressurizing cylinder 5, and the pressurizing piston 6 is lowered to move the piston 3 to a pressure vessel. The reaction force in the direction of the piston axis C2 when inserted into the cylinder 1 is carried by the press frame 4. Although the base of the press frame 4 is not shown, it is installed on a solid floor or the like. Then, the pressure vessel 1 is horizontally moved by a moving device (not shown), and the object to be processed is stored and taken out in the pressure vessel 1 without the pressurizing piston 5 and the piston 3 above the opening.

  Furthermore, the piston type isotropic pressure pressurizing apparatus according to the first embodiment of the present invention is provided with the lubricant applying means 15 for applying the lubricant to the seal portion 3a of the piston 3. The lubricant application means 15 is provided with a lubrication pump 16, a nozzle 17, and a drive cylinder 18. The lubricant pump 16 and the nozzle 17 are slid on a support base 19 by the drive cylinder 18, and the seal portion of the piston 3 is placed. It is possible to move horizontally in the 3a direction. When it is necessary to apply a lubricant to the seal portion 3a, the drive cylinder 18 is extended to bring the nozzle 17 close to the seal portion 3a, while the rotary drive mechanism 11 is driven to move the piston 3 to the piston. Application to the outer periphery of the seal portion 3a is possible while rotating about the axis C2.

  As described above, according to the piston type isotropic pressure pressurizing apparatus according to the present invention, the pressurizing piston 6 and the piston 3 are made to be in close contact with each other, and the piston 3 is connected to the axis of the piston 3 via the piston holder 7. A self-weight support means 11 that generates a reaction force that supports the weight of the piston 3 while the piston 3 is not in contact with the pressure piston 6 is supported in the piston holder 7 so as to allow displacement for adjustment. Therefore, the weight resistance of the piston 3 is reduced by the self-weight support means 11 and can be finely moved in the direction of the axis C1 of the pressure vessel 1.

  Therefore, the core adjustment of the piston 3 with respect to the pressure vessel 1 is automatically and reliably performed by the resistance when the piston 3 is inserted into the pressure vessel 1. As a result, the piston 3 and the pressure vessel 1 slide smoothly, and the life of the contact parts and the seal member 3 can be improved by preventing the piston 3 and the pressure vessel 1 from seizing.

  Next, the operation procedure in the above-described piston type isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention will be described below with reference to the attached FIGS. FIG. 3 is an essential sectional elevation view for explaining the first half of the operation procedure in the piston type isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention, and FIG. The process, FIG. (B) shows the lubricant application process, and FIG. (C) shows the retracting process of the lubricant application means. FIG. 4 is an essential cross-sectional view for explaining the latter half of the operation procedure in the piston type isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention, and FIG. FIG. 4E shows a process for starting the insertion of the piston into the pressure vessel, and FIG. 4F shows a pressurizing process that reaches a predetermined pressure.

  First, after the workpiece is accommodated from the upper opening of the pressure vessel 1, the pressure vessel 1 is moved horizontally below the piston 3. Thereafter, the lubricant application means 15 is advanced in the direction of the seal portion 3a of the piston 3 (FIG. 3A). It should be noted that the lubricant application step can be performed simultaneously from the step of storing the object to be processed in the pressure vessel 1 to the take-out step described later. This is preferable in that the cycle time of the isotropic pressure treatment process can be shortened.

  Then, the tip of the nozzle 17 of the lubricant application means 15 is stopped in a state of approaching the seal portion 3a of the piston 3 with a slight gap. Next, the rotation drive mechanism 11 is started to rotate the piston 3 around the axis C2, and at the same time, the lubrication pump 16 is started to start application of the lubricant from the nozzle 17 (FIG. 3B). At this time, since the piston 3 has the support member 8 and the tapered surfaces 3a and 8a and is supported by its own weight and is constrained in both the axial center C2 and the horizontal direction, lateral blur due to lubricant application occurs. Without uniform, a uniform lubricating coating can be formed on the seal portion 3a. Incidentally, in a piston type isotropic pressure pressurizing apparatus for ultra-high pressure, a pasty solid lubricant is usually used.

  After completing the application of the lubricant, the nozzle 17 of the lubricant application means 15 is retracted from the seal portion 3a of the piston 3 (FIG. 3C). Next, the descent of the piston 3 is started for pressurization (FIG. 4D).

  When the piston 3 further descends and comes into contact with the pressure vessel 1 and starts to be inserted, when the resistance at this time exceeds the own weight of the piston 3 (subtracting the reaction force by the own weight support means 11), the piston 3 It is lifted away from the contact surface of the support member 8 and is movable in both the axial center C2 direction and the horizontal direction (FIG. 4E). At the same time or after this, the piston upper end 3d is in close contact with the pressurizing piston lower end 6a (a state in which the gap S is eliminated), and the surface pressure of the close contact portion increases as pressurization proceeds.

  Further, as the piston 3 is lowered by the pressure applied by the pressurizing piston 6 and inserted into the pressure vessel 1, the piston axis C2 is aligned with the vessel axis C1, and the alignment of both is automatically performed. Done. When a predetermined pressure is reached, the (ultra) high-pressure reaction force generated in the pressure vessel 1 is carried by the press frame 4 from the piston upper end 3d via the pressure piston (FIG. 4). (F)).

  When the predetermined pressurizing force is maintained for a certain time and the high-pressure processing of the workpiece is completed, the piston 3 is raised and depressurized. After completion of the decompression, the piston 3 is lifted from the pressure vessel 1 and removed to return to the initial state shown in FIG. Thereafter, the pressure vessel 1 is moved horizontally (not shown), and the object to be processed is taken out from the upper opening.

  As described above, according to the piston type isotropic pressure pressurizing apparatus according to the present invention, the rotary drive mechanism 11 for rotating the piston 3 is provided, and the lubricant is applied to the seal portion 3a of the piston 3, Since the horizontally-movable lubricant applying means 15 is provided, it is possible to automatically apply the lubricant on the seal portion 3a and to automate all the processes associated with the high-pressure processing, thereby obtaining high productivity. .

  Next, a piston type isotropic pressure pressurizing apparatus according to Embodiment 2 of the present invention will be described below with reference to FIG. FIG. 5 is an elevational sectional view for explaining a piston type isotropic pressure pressurizing apparatus according to Embodiment 2 of the present invention. However, the second embodiment of the present invention differs from the first embodiment in that the arrangement of the pressurizing piston and the pressurizing cylinder is different, and the other configuration is exactly the same as in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described below.

  That is, in the piston type isotropic pressure pressurizing device of the first embodiment, the pressurizing cylinder 5 is fixed to the press frame 4 disposed above the pressure vessel 1, and the pressurizing piston 6 is placed in the pressurizing cylinder 5. The piston type isotropic pressure pressurizing device according to the second embodiment is arranged so that the pressurizing cylinder 5 is fixed on the pedestal 21 and the pressure is increased. The pressure piston 6 of the pressure cylinder 5 is arranged so as to be able to move up and down. A lower lid 2 of the pressure vessel 1 is fixed to the upper end of the pressurizing piston 6. On the other hand, the piston 3 is supported by a lower end of the press frame 4 via a piston holder 7 so as to face the upper opening of the pressure vessel 1.

  The mounting structure of the piston 3 and the piston holder 7 has exactly the same configuration when the pressurizing piston 3 in the first embodiment is replaced with the press frame 4. That is, a clearance S is secured between the upper end 3d of the piston and the lower end 4a of the press frame, and the piston 3 is allowed to be separated from the piston 3 through the piston holder 7. It is supported to do.

  At the same time, a self-weight support means (spring) 10 is provided in the piston holder 7 for generating a reaction force for supporting the self-weight of the piston 3 while the piston 3 is not in contact with the press frame 4. The piston 3 is configured to be automatically rotated by the rotation drive mechanism 11 while being supported by the bearing 9 in parallel with the self-weight support means 10.

  On the other hand, the pressurizing piston 6 raises the pressure vessel 1 through the lower lid 2 by hydraulic pressure, as in the first embodiment, and the upper opening of the pressure vessel 1 is fitted into the piston 3. At this time, due to the resistance that the piston 3 is inserted into the pressure vessel 1, the piston 3 is lifted from the support member 8 and is movable in the direction of the axis C2 and in the horizontal direction. The alignment is automatically performed so as to coincide with the axis C1 of the container 1.

  The piston 3 can be automatically rotated by the rotation drive mechanism 11 while being supported by the bearing 9, and the lubricant application means 15 can apply the lubricant evenly to the seal portion 3 a of the piston 3.

  Therefore, the piston-type isotropic pressure pressurizing device according to the second embodiment of the present invention includes automatic alignment when the piston 3 is inserted into the pressure vessel 1, automation of lubricant application to the seal portion 3a of the piston 3, and Is the same as the piston type isotropic pressure pressurizing apparatus according to the first embodiment of the present invention in that all processes of the pressurizing process using the pressurizing apparatus can be automated.

  Next, a piston type isotropic pressure pressurizing apparatus according to Embodiment 3 of the present invention will be described below without using the drawings. The third embodiment of the present invention differs from the first embodiment in that there is a difference in the configuration in the piston holder and the configuration of the lubricant application means, and the other configuration is exactly the same as in the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be described below.

  That is, in the piston type isotropic pressure pressurizing device according to the first embodiment, the piston 3 is supported by the bearing 9 and is rotatable, and the rotation drive mechanism 11 that can automatically rotate the piston 3. While the piston holder 7 is provided with the lubricant applying means 15 that is movable in the horizontal direction, the piston type isotropic pressure pressurizing device according to the second embodiment is supported by the piston 3. A support mechanism for supporting the piston 3 is constituted in the piston holder 7 by the self-weight support means 10 and the support member 8 having only the tapered surface 8a, without the bearing 9 and the rotation drive mechanism 11 for automatic rotation. In order to apply the lubricant from the periphery to the three seal portions 3a, there is provided a lubricant application means that is rotatable on a horizontal plane.

  Therefore, the piston type isotropic pressure pressurizing device according to the third embodiment of the present invention is an automatic alignment when the piston 3 is inserted into the pressure vessel 1, automation of the lubricant application to the seal portion 3a of the piston 3, and Is the same as the piston type isotropic pressure pressurizing apparatus according to the first embodiment of the present invention in that all processes of the pressurizing process using the pressurizing apparatus can be automated. Further, by not providing the rotation drive mechanism 11 that can automatically rotate the piston 3, the structure in the piston holder 7 can be simplified, and when the piston 3 is enlarged, the manufacturing cost can be reduced.

  As described above, according to the piston type isotropic pressure pressurizing device according to the present invention, the pressurizing piston and the piston can be brought into close contact with each other, and the piston is displaced for adjusting the axial center of the piston through the piston holder. The piston holder is provided with a self-weight support means for generating a reaction force that supports the self-weight of the piston in a state where the piston is not in contact with the pressurizing piston. The weight resistance of the pressure vessel is reduced, and it can be finely moved in the axial direction of the pressure vessel.

  Therefore, the core is adjusted so that the piston is lifted by the reaction force (contact resistance and the compression pressure of the pressure medium) received when the piston is inserted into the pressure vessel, and the axis of the piston coincides with the axis of the pressure vessel. This is done automatically and reliably. As a result, smooth sliding between the piston and the pressure vessel is achieved, and the life of the contact parts and the seal member is improved by preventing seizure of the piston and the pressure vessel.

  Further, according to the piston type isotropic pressure pressurizing apparatus according to the present invention, since the piston is automatically rotated by the rotation drive mechanism in a state where the piston is supported by the bearing, the seal portion provided in the piston Lubricant can be applied easily and evenly.

It is an elevation sectional view for explaining the piston type isotropic pressure pressurizing device concerning Embodiment 1 of the present invention. It is a principal part sectional drawing which shows the principal part of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an essential cross-sectional view for explaining the first half of an operation procedure in a piston-type isotropic pressure pressurizing apparatus according to Embodiment 1 of the present invention, and FIG. b) shows a lubricant application step, and FIG. (c) shows a retracting step of the lubricant application means. FIG. 4 is a vertical sectional view of a main part for explaining the latter half of the operation procedure in the piston type isotropic pressure pressurizing apparatus according to the first embodiment of the present invention. FIG. The process of starting insertion into the pressure vessel and FIG. It is an elevation sectional view for explaining a piston type isotropic pressure pressurizing device concerning Embodiment 2 of the present invention. One Example of the piston type isotropic pressure pressurization apparatus which concerns on a prior art example is shown, Fig. (A) is each elevation sectional drawing of a no-load state during a pressurization process.

Explanation of symbols

C1: Pressure vessel axis, C2: Piston axis,
d1: Upper outer diameter of the piston, d2: Lower outer diameter of the piston, S: Clearance,
1: pressure vessel, 2: lower lid, 2a: seal part,
3: piston, 3a: seal part, 3b: step part,
3c: Tapered surface, 3d: Upper end of piston,
4: Press frame, 4a: Lower end of press frame,
5: Pressure cylinder, 6: Pressure piston, 6a: Pressure piston lower end,
7: piston holder,
8: Support member, 8a: Tapered surface,
9: bearing, 10: self-weight support means (spring),
11: Rotation drive mechanism, 12: First gear, 13: Second gear, 14: Drive motor,
15: Lubricant application means, 16: Lubrication pump, 17: Nozzle,
18: Drive cylinder, 19: Support base,
20: Pressure medium (liquid), 20a: Predetermined liquid level,
21: Pedestal

Claims (7)

A piston interlocked with the pressurizing piston is inserted into the pressure vessel by extension of the pressurizing piston in the pressurizing cylinder, and the workpiece is pressurized with isotropic pressure through compression of the pressure medium in the pressure vessel. In the piston type isotropic pressure pressurizer,
The pressurizing piston and the piston can be brought into close contact / separation through a piston holder, and the piston is supported through the piston holder so as to allow displacement for adjusting the axial center of the piston,
The piston holder is provided with a self-weight support means for generating a reaction force that opposes the self-weight of the piston in order to support the piston in a state where the piston is not in contact with the pressurizing piston.
The pressure piston and the piston are brought into close contact by resistance received when the piston is inserted into the pressure vessel, and the piston is automatically aligned so that the axis of the piston coincides with the axis of the pressure vessel. Piston type isotropic pressure press.   The piston-type isotropic pressure pressurizing device according to claim 1, wherein the self-weight support means generates a reaction force by a spring.   3. The piston type isotropic pressurization according to claim 1, wherein the piston is supported by a bearing in parallel with the self-weight support means and is rotatable in a non-contact state with the pressure vessel. Pressure device.   4. The piston type isotropic pressure pressurizing device according to claim 3, wherein the piston is brought into contact with the bearing or a support member interposed between the bearing and the bearing with a tapered surface.   5. The piston type isotropic pressure pressurizing device according to claim 3, wherein the piston is automatically rotated by a rotation drive mechanism in a state where the piston is supported by the bearing.   The piston according to any one of claims 3 to 5, further comprising a horizontally movable lubricant applying means for applying a lubricant to a seal portion of the rotating piston. Type isotropic pressure press. The piston-type isotropic pressure pressurization according to claim 1 or 2, further comprising a lubricant application means capable of rotating around the seal portion in order to apply a lubricant to the seal portion of the piston. apparatus.

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