JPH0724951B2 - Powder feeding device for cold isostatic pressing, powder distribution equalizing device, core holding device and cylindrical rubber mold holding device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder feeding device for cold isostatic pressing, a powder distribution equalizing device, a core holding device, and a cylindrical rubber die holding device, and more specifically, the core is broken. In order to perform cold isostatic press molding without eccentricity or eccentricity of the core, cold supply of powder between the cylindrical rubber mold and the center core erected at its center Powder feeding device for isotropic pressure press, powder distribution equalizing device that can prevent uneven distribution of powder in the cylindrical rubber mold that causes breakage of the core during cold isostatic pressing, A core holding device that can prevent displacement of the core that causes the core to break during cold isostatic pressing, and a cylinder that causes breakage of the core during cold isostatic pressing. The present invention relates to a cylindrical rubber die holding device capable of preventing the rubber die from bending.

[0002]

2. Description of the Related Art A columnar pressure-molded body and a molded body having a special shape in which a center core of glass or the like is inserted and arranged at the center thereof are manufactured as follows.

That is, a center core is erected at the center of the inside of a cylindrical rubber mold, and powder is supplied into the cylindrical rubber mold from a powder supply nozzle facing the upper opening of the cylindrical rubber mold.
After the powder is supplied, the upper opening of the cylindrical rubber mold is closed with a lid member. Next, the cylindrical rubber mold closed with the lid member is loaded into a cold isostatic pressing apparatus, and isotropic pressure molding is performed.

However, since the powder is supplied into the cylindrical rubber mold from the powder supply nozzle which faces the upper opening of the cylindrical rubber mold, the powder falling into the cylindrical rubber mold is in the cylindrical rubber mold. Since the particles are accumulated in a conical shape, fine powder accumulates at the apex of the conical shape, while coarse powder accumulates at or near the bottom of the conical shape. Therefore, as a filling state of the powder filled in the cylindrical rubber mold, coarse powder is present in a certain portion and fine powder is present in another portion.

As described above, if the powder filled in the cylindrical rubber mold has a coarse and dense state, the core disposed in the cylindrical rubber mold is accurately cylindrical before the powder is supplied. Even if the rubber mold is arranged at the axial center of the mold, its position may be displaced by the supply of the powder. If isotropic molding is performed while the core is displaced, pressure is applied to the core unevenly during pressing, and the core is broken.

Even if the center core is accurately set up in the center of the cylindrical rubber mold, the powder is supplied, and the center of the core stands obliquely due to the pressure of the powder accumulated in the cylindrical rubber mold. Sometimes set up. If isotropic molding is performed in a state where the core is erected obliquely in the cylindrical rubber mold, uneven molding pressure is applied to the core, causing breakage of the core.

When the cylindrical rubber die has a considerably long axial length, when the cylindrical rubber die is erected,
The cylindrical rubber mold may bend.

If the powder is supplied into the cylindrical rubber mold in the bent state, the radial thickness of the powder filled in the cylindrical rubber mold will not be uniform. If isotropic pressure forming is performed while the radial thickness is uneven, pressure is applied unevenly to the core during pressing, and the core is broken.

An object of the present invention is to solve the above problems. That is, an object of the present invention is to provide a molded product of a special shape having a columnar pressure molded product and a core inserted through the shaft core, using a cylindrical rubber mold and a core erected inside thereof. To provide a powder feeder for a cold isostatic press capable of supplying powder into a cylindrical rubber mold so as to prevent breakage of a core during press molding during molding. It is in.

Another object of the present invention is to use a cylindrical rubber mold and a core erected inside the cylindrical rubber mold to provide a special shape having a columnar pressure molded body and a core inserted through the shaft core. Provided is a powder distribution uniformizing device capable of uniformly filling powder in a cylindrical rubber mold so as to prevent breakage of a core during press molding when molding a molded body. Especially.

Another object of the present invention is to use a cylindrical rubber mold and a core that stands upright in the cylindrical rubber mold and have a special shape having a cylindrical pressure-molded body and a core that is inserted through the shaft core. An object of the present invention is to provide a core holding device capable of holding the core at the center of the cylindrical rubber mold when the powder is supplied into the cylindrical rubber mold when molding the molded body.

Another object of the present invention is to use a cylindrical rubber mold and a core which is erected inside the cylindrical rubber mold and to have a special shape having a cylindrical pressure-molded body and a core inserted through the axis thereof. It is an object of the present invention to provide a cylindrical rubber mold holding device for vertically arranging a cylindrical rubber mold without bending so as to prevent breakage of a core during press molding when molding a molded body.

[0013]

According to a first aspect of the present invention for solving the above-mentioned problems, a powder is supplied between a cylindrical rubber mold and a core provided inside the cylindrical rubber mold at an axial position. In a powder feeding device for a cold isostatic press, a cold isotropic pressure is provided, which has a nozzle capable of supplying powder into a cylindrical rubber mold and horizontally rotating and moving up and down in the cylindrical rubber mold. A powder feeding device for presses, wherein the invention according to claim 2 is inserted into the powder supplied between a cylindrical rubber mold and a center core erected at the center thereof, and vibrates in the powder. A powder distribution homogenizing device having a vibrating rod for imparting a contact, wherein the invention according to claim 3 makes contact with an inner wall of a cylindrical rubber mold and a core provided upright at the center of the cylindrical rubber mold. While rotating and moving up and down around the center core, the pair of center cores symmetrically arranged around the center core A core holding device comprising holding means, and the invention according to claim 4 is a cylindrical outer cylinder member capable of accommodating a cylindrical rubber mold, and an inner surface of the cylindrical outer cylinder member. Wherein, equipped with an expansion bag inflatable by gas, a cylindrical rubber mold holding device, characterized in that it is possible to hold a cylindrical rubber mold by the expansion bag into which gas is pressed, The invention according to claim 5 is at least any one of the powder distribution equalizing device according to claim 2, the core holding device according to claim 3, and the cylindrical rubber-type holding device according to claim 4. The powder feeding device for a cold isostatic press according to claim 1, further comprising:

[0014]

According to the present invention described above, in particular, the powder feeder for cold isostatic pressing, when the powder is supplied between the cylindrical rubber mold and the inner core erected inside the rubber mold, the nozzle first makes a cylindrical shape. The powder is supplied at the bottom of the shaped rubber mold, and the nozzle rises as the powder accumulates at the bottom of the cylindrical rubber mold. As the upper surface of the powder accumulated inside the cylindrical rubber mold rises due to the supply of the powder, the nozzle also rises. As described above, since the nozzle is raised according to the powder accumulated in the cylindrical rubber mold, the powder is supplied from the nozzle located at a high position facing the upper opening of the cylindrical rubber mold as in the conventional case. As a result, a conical accumulation of powder does not occur. Therefore, it is possible to prevent the occurrence of the dense and dense state in the powder filled state due to the generation of the cone-shaped pool.

According to the powder distribution homogenizing apparatus of the second aspect, the vibrating rod is attached to the powder supplied between the cylindrical rubber mold and the core erected at the inner center of the rubber mold. Since it is inserted and the powder is vibrated by the vibrating rod,
It is possible to prevent the occurrence of a dense state in the filled state of the powder to be filled.

According to the core holding device of the third aspect, while the core holding means is in contact with the inner wall of the cylindrical rubber type inner core, the pair of core holding means center the center core. As it rotates and moves up and down, the core is always forced to the center of the cylindrical rubber mold.

According to the cylindrical rubber mold holding device of the fourth aspect, the cylindrical rubber mold housed in the cylindrical outer cylinder member is mounted on the inner surface of the cylindrical outer cylinder member. Since the inflatable bag that can be inflated by gas is forcibly held from the outer peripheral surface of the cylindrical rubber die, even if the cylindrical rubber die is vertically long, the outer peripheral surface of the cylindrical rubber die may be bent. Disappear.

In the powder feeding device for cold isostatic pressing according to the fifth aspect, when the powder distribution equalizing device is provided, the filled powder does not have a coarse and dense distribution, and the core is retained. With a device, powder can be supplied with the center of the cylindrical rubber mold accurately positioned on the axis of the cylindrical rubber mold, and the cylindrical rubber mold holding device is provided. Therefore, even when the vertically long cylindrical rubber mold is erected, the bending of the cylindrical rubber mold does not occur. Therefore, by using this cylindrical rubber holding device, in any radial direction of the cylindrical rubber mold. The powder will be evenly supplied,
There is no risk of breaking the core during press working.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention, which is for a cold isostatic press incorporating a powder distribution equalizing device, a core holding device and a cylindrical rubber mold holding device. It is a powder supply device.

In FIG. 1, reference numeral 1 denotes a cylindrical rubber die, and reference numeral 2 denotes a brittle material such as a glass rod, which is vertically arranged in the axial center portion of the cylindrical rubber die. It is a core that is a rod.

As shown in FIGS. 1 and 2, four nozzles 4 are attached to an annular support 3 into which the core 2 can be inserted, at positions perpendicular to each other. This annular support 3 is retained on a vertically extending suspension support 5. The suspension support 5 can be raised and lowered by a drive source (not shown), and can be rotated so that the annular support 3 can be rotated about the center by another drive source (not shown). It is possible.

In FIG. 1, 6 is a powder supply pipe for feeding powder to the nozzle 4. The annular support 3 is further provided with four center core holding members 7 at positions which are orthogonal to each other between the mounting positions of the four nozzles 4.

As shown in FIG. 3, this core holding member 7
Is a tube body 9 rotatably attached to a support portion 8 bent downward at a right angle from the annular support body 3, and a bearing holding member provided at both end openings of the tube body 9. 10 and. A bearing sphere 11 is rotatably mounted on the bearing holding member 10 at the portion toward the center and at the portion toward the inner peripheral surface of the cylindrical rubber mold 1. A gas introduction port 12 for squeezing and inserting gas into the inside of the pipe body 9 is provided on the peripheral surface of the pipe body 9.

Reference numeral 13 in FIG. 3 denotes an O-ring mounted on the outer periphery of the bearing holding member 10, and the O-ring maintains the airtightness inside the tube 9. Reference numeral 14 denotes a wire attached to the upper surface of the end portion of the tube body 9. By operating the wire 14, the tube body 9 can be rotated with respect to the support portion 8. . Reference numeral 15 is a gas introduction pipe for supplying gas into the inside of the pipe body 9.

As shown in FIG. 1, reference numeral 16 denotes a vibrating rod, and vibration is transmitted to the vibrating rod from an unillustrated vibration source by appropriate means. This vibrating rod is
The ring-shaped support body 3 may be mounted so as not to transmit the vibration of the vibrating rod 16 to the support body. FIG. 4 is an enlarged cross-sectional view showing a portion marked with a circle in FIG.

Reference numeral 17 shown in FIGS. 4 and 1 is an outer cylinder member for accommodating the cylindrical rubber mold 1. A rubber film 18 is provided on the inner peripheral surface of the outer cylinder member 17 as shown in FIG. Stretched,
The upper and lower ends of the rubber film 18 are airtightly adhered to the inner peripheral surface of the outer tubular member 17. The outer cylinder member 17 is provided with gas press-fitting means 20 for squeezing and inserting gas into a space 19 formed between the inner peripheral surface of the outer cylinder member 17 and the rubber film 18. As shown also in FIG. 1, the gas press-fitting means 20 includes a gas introducing pipe 21 connected to the outer cylinder member 17, a pressure reducing valve 22 for adjusting the pressure of the gas, and a high-pressure gas source for supplying high-pressure gas ( (Not shown), and a valve 23 or the like for leaking the press-fitted gas. in this way,
The rubber film 18 forms an inflatable bag when gas is pressed into the gas press-fitting means 20.

In this embodiment, the powder distribution homogenizing apparatus according to one embodiment of the present invention is such that the annular support member 3,
It comprises a vibrating rod 16 mounted on the annular support 3, a vibration source (not shown), and a vibration transmitting means (not shown) for transmitting vibration from the vibration source (not shown) to the vibrating rod 16.

In this embodiment, a center core holding device which is an embodiment of the present invention includes the annular support 3, the suspension support 5 for holding the annular support 3, and the suspension support 5. It is provided with a drive source capable of moving up and down, a tube body 9 mounted on the annular support body 3, a bearing holding member 10 mounted on the tube body 9, a bearing ball 11, and the like.

In this embodiment, the cylindrical rubber die holding device according to the embodiment of the present invention is such that the outer cylinder member 17,
The rubber film 18 and the gas press-fitting means 20 are provided.

Further, in the present invention, the annular support 3 and the vibrating rod 16 mounted on the annular support 3,
A drive source (not shown), which is held by the annular support 3 4
At least a powder feeding device for cold isostatic pressing can be constituted by the base nozzle 4, and it is provided with the vibration transmitting means, the core holding device, and the cylindrical rubber mold holding device, A powder feeding device for a cold isostatic press comprising a support 3, a vibrating rod 16 mounted on the support, a drive source (not shown), and four nozzles 4 held by the annular support 3 is configured. You can also do it.

The operation of the embodiment of the present invention having the above construction will be described. First, the core 2 is mounted inside the cylindrical rubber mold 1. The bottom surface of the cylindrical rubber mold 1 is provided with a core mounting hole 24. Therefore, by inserting the end portion of the core 2 into the core mounting hole 24, the inside of the cylindrical rubber mold 1 is inserted. The core 2 is erected on the.

By pressing compressed gas into the space between the outer cylinder member 17 and the rubber film 18 stretched on the inner surface thereof,
The rubber film 18 is expanded, and the expansion of the rubber film 18 holds the cylindrical rubber mold 1 in the outer cylinder. at least,
The expanding rubber film 18 prevents the cylindrical rubber mold 1 from bending outward.

Next, the annular support 3 is lowered by a drive source (not shown) so that the lower end opening of the nozzle 4 faces the bottom of the cylindrical rubber mold 1. In this case, the annular support 3
With the core 2 inserted in the ring, the annular support 3 moves down. When descending, the tubular body 9 rotates in the vertical direction, and the annular support body 3 descends without being particularly caught. When the annular support 3 descends, as shown in FIGS. 1 and 3, the tube body 9 horizontally rotates, and one bearing ball in the bearing holding member 10 provided in the opening portions at both ends of the tube body 9. 11 is in sliding contact with the outer peripheral surface of the core 2, and the other bearing ball 11 is in sliding contact with the inner wall of the cylindrical rubber mold 1. Then, as shown in FIG. 2, four tube bodies 9 are attached to the annular support body 3 in the cross direction. Therefore, the inner wall of the cylindrical rubber mold 1 is supported from the inside by the four pipes 9.

Next, the annular support 3 is horizontally rotated by a drive source (not shown) and the four nozzles 4 are provided.
From which powder 25 is discharged. By rotating the annular support body 3, the pair of bearing balls 11 in the tubular body 9 are brought into sliding contact with the inner core 2 and the inner peripheral surface of the cylindrical rubber mold 1, for example, the inner peripheral surface of the cylindrical rubber mold 1. The surface is prevented from bending inward, and the distance between the core 2 and the inner peripheral surface of the cylindrical rubber mold 1 is always kept constant. Then, by means of a drive source (not shown), the annular support 3 gradually rises while rotating.

As the annular support 3 rotates and rises, the powder 25 discharged from the nozzle 4 has a cylindrical rubber mold 1
It will be stored inside. Moreover, since the stored powder 25 is not supplied from the nozzle 4 at a high position, a cone-shaped pool does not occur. It does not produce a dense or dense distribution. By the rotation of the tubular body 9, the distance between the inner peripheral surface of the cylindrical rubber mold 1 and the core 2 is always kept constant, and therefore the core 2 is located at the axial center of the cylindrical rubber mold 1. become. Also, the expanded rubber film 1
Since the cylindrical rubber mold 1 is pressed by 8, the cylindrical rubber mold 1 does not bend outward,
Further, since the rotating tubular body 9 supports the inner peripheral surface of the cylindrical rubber mold 1 with respect to the core 2, the inner peripheral surface of the cylindrical rubber mold 1 does not bend inward.

When the powder is stored to the extent that the vibrating rod 16 held by the annular support 3 is embedded, the vibrating rod 16 is vibrated by a vibration source (not shown), and the vibrating vibrating rod 16 causes the vibrating rod 16 to store the vibrating rod 16. The powder 25 to be dispersed is further dispersed, and the vibration prevents the powder 25 to be stored from becoming coarse and dense.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to this embodiment and can be appropriately modified in design within the scope of the gist of the present invention.

For example, as shown in FIG. 5, the bearing holding member 10 provided at the opening portions at both ends of the tubular body 9 may be biased by a biasing member 19 mounted inside the tubular body 9, for example, a spring. good.

[0040]

Since the powder feeding device for cold isostatic pressing of the present invention is provided with the nozzle capable of horizontal rotation and ascending / descending in the cylindrical rubber mold, the powder feeding device of the conical shape is formed in the cylindrical rubber mold. The powder is not accumulated in the cylindrical rubber mold so that it is possible to prevent the powder from becoming dense and dense due to the conical powder accumulation. Can be supplied to. Then, when powder is supplied by the powder feeding device for cold isostatic pressing and then cold isostatic pressing is performed, breakage accidents of the core can be remarkably reduced.

Since the powder distribution homogenizing apparatus of the present invention is provided with the vibrating rod for vibrating the powder supplied into the cylindrical rubber mold, the powder packed in the cylindrical rubber mold is However, if the cold and isotropic pressure molding is performed using a cylindrical rubber mold filled with powder using this powder distribution homogenizer, the possibility of breakage of the core is significantly increased. It can be reduced.

In the core holding device of the present invention, since the inner peripheral surface of the cylindrical rubber mold and the core are held constantly, the core can always be positioned at the axial center of the cylindrical rubber mold. That is, the radial lengths of the core and the inner peripheral surface of the cylindrical rubber mold can be kept constant at all times. Therefore, even if the powder is filled in the cylindrical rubber mold by using the core holding device, the powder is filled in the cylindrical rubber mold in a state where the core is arranged at the axial center position. Therefore, even if cold isostatic pressing is performed, breakage of the core is significantly reduced.

The cylindrical rubber die holding device according to the present invention, when powder is supplied into the cylindrical rubber die, tends to occur particularly when the cylindrical rubber die is vertically long. It is possible to prevent the bending to. Therefore, when the powder is supplied into the cylindrical rubber mold while using the cylindrical rubber mold holding device, the powder can be supplied into the cylindrical rubber mold without bending, so that the surface of the core is The radial distance from the to the inner peripheral surface of the cylindrical rubber mold can always be made constant, which also effectively prevents breakage of the core during cold isostatic pressing. .

Further, according to the powder feeding device for cold isostatic pressing in which the powder distribution uniformizing device, the core holding device and the cylindrical rubber mold holding device are incorporated, the outer circumference of the cylindrical rubber mold is not bent or bent. It is possible to prevent this from occurring and to always position the core at the axial center of the cylindrical rubber die, and to uniformly fill the cylindrical rubber die with the powder without causing a coarse and dense state of the powder. Therefore, when the powder filled in the cylindrical rubber mold is cold isostatically pressed by using this powder feeding device for cold isostatic pressing, the breakage accident of the core is reduced and the core is reduced. It is possible to manufacture a cylindrical pressure-molded article having

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention,
It is a schematic explanatory drawing which shows the powder supply device for cold isostatic presses which incorporates a powder distribution equalizing device, a core holding device, and a cylindrical rubber type holding device.

FIG. 2 is a schematic horizontal sectional view showing the powder supply device for cold isostatic pressing shown in FIG.

FIG. 3 is a schematic explanatory view showing a core holding device incorporated in the powder supply device for cold isostatic pressing shown in FIG.

FIG. 4 is an enlarged explanatory view showing a portion surrounded by a circle in the powder supply device for cold isostatic pressing shown in FIG.

FIG. 5 is a schematic explanatory view showing another example of the core holding device of the present invention.

[Explanation of symbols]

 1 Cylindrical rubber type 2 Core 4 Nozzle 7 Core holding member 17 Outer cylinder member 25 Powder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Aki Nishioka 3-43-2, Ebisu, Shibuya-ku, Tokyo Within Nikkiso Co., Ltd. (56) References: Kaikaihei 1-96296 (JP, U)

Claims (5)

[Claims] 1. A powder feeding device for a cold isostatic press, which supplies powder between a cylindrical rubber die and a core arranged at an axial position inside the cylindrical rubber die. And a nozzle capable of horizontally rotating and moving up and down in a cylindrical rubber mold, and a powder feeding device for a cold isostatic press. 2. A uniform powder distribution having a vibrating rod inserted into the powder supplied between a cylindrical rubber die and a core provided upright at the center thereof to impart vibration to the powder. apparatus. 3. An inner wall of a cylindrical rubber mold and a center core standing upright at the center of the cylindrical rubber mold, while rotating and moving up and down about the center core, centering on the center core. A core holding device comprising a pair of core holding means symmetrically arranged. 4. A cylindrical outer cylinder member capable of accommodating a cylindrical rubber mold, and an expansion bag which is mounted on the inner surface of the cylindrical outer cylinder member and is inflatable by gas, and gas is press-fitted therein. A cylindrical rubber mold holding device, wherein the expansion bag can hold a cylindrical rubber mold. 5. The powder distribution equalizing device according to claim 2, the core holding device according to claim 3, and the cylindrical rubber-type holding device according to claim 4, The powder feeding device for a cold isostatic press according to claim 1, wherein