JPH09169301A - Stuffing method of molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively and rapidly stuff a material, by supplying the material into a closed space having an opening, making the space alternately in a low pressure condition or a high pressure condition with an air tapping. SOLUTION: A cylindrical guide member 5 is put on the upper face of a split mold 4 and a weighed powdery material P is supplied in a guide hole 5a by a specified height. And a cover member 6 is put on the cylindrical guide member 5 and the guide hole 5a and the closed space 4d are deaerated through the pierced hole 6a by a vacuum pump to make the space 4d in a low pressure condition. After that, the vacuum pump is brought to a stop to guide air from the pierced hole 6a and make the guide hole 5a and the closed space 4d in a high pressure condition. After such a operation has been appropriately repeated, a punch 7 is inserted in the guide hole 5a to compact the powdery material. Then, the cylindrical guide member 5, the cover member 6, and the punch 7 are removed and the two split molds 4a, 4b are separated and the pressurized molded material C is removed from the split mold 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has various articles such as powders, granules, foils, and plates (hereinafter also referred to as "filled objects") having an opening serving as a supply port. Container, can,
The present invention relates to a method of filling an object to be filled into a closed space such as a bag, a rubber mold, or a mold.

[0002]

2. Description of the Related Art Conventionally, when an object to be filled is filled in an enclosed space having an opening serving as a supply port for the object to be filled, the object to be filled is accommodated in the enclosed space from the opening, and then the enclosed space is There is known a method for filling an object to be filled that is more compact in size so as to fill the enclosed space by pressing the housed object with a pressing body such as a pusher.

Further, after the object to be filled is housed in the closed space,
There is also known a method of filling an object to be filled in a more compact manner by mechanically vibrating or tapping a container or the like to fill the enclosed space.

[0004]

In the above-described conventional method for filling the filling object, the filling object accommodated in the closed space is pressed by a pressing body such as a pusher, or vibrated or tapped. Therefore, when the stored filling object has low mechanical strength, there is a problem that the stored filling object is damaged by the pressing of the pressing body.

In addition, mechanical vibration or tapping
When added to a mold or container, a jig or device for holding them, a table for transferring the mold or container, etc., there is a problem in that these are damaged or the service life is shortened.

Furthermore, when the object to be filled is housed in a closed space and pressed by a pressing body such as a punch, the pressing force of the pressing body is less likely to be transmitted to a portion distant from the pressing body. There is a problem in that there is a difference between the packing density of the object to be filled and the packing density of the portion away from the pressing body, and the object to be filled cannot be uniformly filled. This problem becomes particularly noticeable when the closed space is elongated. For example,
If pressing with a punch or pressing with hydrostatic pressure is performed while the powder as the material to be filled is unevenly filled in the mold or the rubber container, the green compact is easily cracked or chipped.
Further, if the object to be filled cannot be uniformly filled in the container or the like, the filling amount decreases as a whole, and the space in the container cannot be used sufficiently and effectively. As described above, there are many industrial requirements that the filling of the object to be filled into the container or the like be as uniform as possible, and that the filling density be relatively high. It was difficult to satisfy.

An object of the present invention is to solve the problems of the above-described conventional methods for filling objects to be filled, and to provide a method for filling objects to be filled that is capable of performing effective and rapid filling. is there.

[0008]

In order to achieve the above-mentioned object, the present invention provides a method for filling an object to be filled, comprising:
In, by supplying an object to be filled into a closed space portion including a closed space having an opening, the closed space portion is alternately subjected to air tapping to a low pressure state and a high pressure state,
The object to be filled is to fill the closed space with high density. Secondly, the object to be filled is supplied to the closed space having an opening,
By alternately air-tapping the closed space portion including the closed space into a low pressure state and a high pressure state,
Thirdly, the closed space is filled with the filling material at a high density. Thirdly, a cylindrical guide member is placed in the closed space having an opening, and the closed space and the cylindrical guide member are covered. By supplying a filling material and alternately performing air tapping in the closed space and the inside of the cylindrical guide member to a low pressure state and a high pressure state, the closed space is filled with the filling material at a high density. Fourthly, the flow velocity of the gas in the high pressure state is made higher than the flow velocity of the gas in the low pressure state, and fifthly, the closed space is formed in the mold. The sixth is that the closed space is a space formed in the rubber mold, and the seventh is that the closed space is a container.

Examples of the present invention will be described below, but the present invention is not limited to the examples unless it goes beyond the gist of the present invention.

[0010]

EXAMPLES First, a method for filling an object to be filled according to the present invention will be described by using an example in which a powder as an object to be filled is filled into a closed space formed in a split mold to form a green compact. explain. FIG. 1 is a perspective view of an example of a component manufactured by subjecting a molded green compact to sintering and the like, and FIG. 2 is a vertical cross-section of a split mold or the like for molding the green compact. It is a figure.

A component W shown in FIG. 1 is a component in which a spur gear 2 and a bevel gear 3 are integrally formed at the end of the shaft 1 in the middle of the shaft 1. A means for molding the green compact of W with a split mold will be described.

Reference numeral 4 denotes a split mold that is assembled by abutting the vertical joining surfaces of the two mold members 4a and 4b. The assembled split mold 4 has an opening 4c upward.
, And the closed space 4d of the split mold 4 filled with the powder p is designed from the part W shown in FIG. 1 in consideration of dimensional aberration during sintering. Reference numeral 5 is a tubular guide member placed on the upper surface of the split mold 4, and the diameter of the guide hole 5a of the tubular guide member 5 is the same as the diameter of the opening 4c or smaller than the diameter of the opening 4c. Is formed in. In addition,
The upper end of the guide hole 5a of the tubular guide member 5 is preferably formed on the inclined surface 5b which is expanded to facilitate the supply of the powder p to the guide hole 5a.

As shown in FIG. 2 (a), after the cylindrical guide member 5 is placed on the upper surface of the split mold 4, an appropriate supply device (not shown) preliminarily weighs an appropriate amount. Powder p is supplied to the closed space 4d of the split mold 4 and the guide hole 5a of the tubular guide member 5 to a predetermined height.

Next, as shown in FIG. 2 (b), the tubular guide member 5 is covered with the lid member 6 in a hermetically sealed manner.
An appropriate number of through holes 6a are formed in the lid member 6, and a connecting pipe 6b is connected to the through holes 6a. Connection pipe 6b
Is connected to a pump device (not shown) such as an ejector type vacuum generator. After covering the tubular guide member 5 with the lid member 6, the pump device is operated to pass through the through hole 6a from the guide hole 5a of the tubular guide member 5 as a closed space and the closed space 4d of the split mold 4. By removing air, the guide hole 5a of the tubular guide member 5 and the split mold 4
The closed space 4d is brought to a low pressure state. In this way, by setting the guide hole 5a of the tubular guide member 5 as a closed space and the closed space 4d of the split mold 4 in a low pressure state,
The air contained in the powder p is degassed.

Next, after a lapse of a predetermined time, the compressed air to the pump device such as the ejector type vacuum generator is stopped and the through hole 6 is formed.
When air is introduced from a to make the guide hole 5a of the tubular guide member 5 as a closed space and the closed space 4d of the split mold 4 into a high atmospheric pressure state, the closed space 4d of the split mold 4 and the tubular guide member. The filling density of the powder p filled in the guide hole 5a of No. 5 increases. As described above, the air contained in the powder p is removed by repeating the guide hole 5a of the tubular guide member 5 and the closed space 4d of the split mold 4 for a proper number of times to bring them into the low pressure state and the high pressure state. The air can be degassed, and most of the powder p filled in the guide hole 5a of the tubular guide member 5 can be filled in the closed space 4d of the split mold 4. The repetitive work in the low pressure state and the high pressure state will be hereinafter referred to as air tapping work or simply air tapping. By such an air tapping operation, high-density filling of the powder p into the closed space 4d of the split mold 4 can be achieved.

In the air tapping operation described above,
Not only air but various gases and gases can be used. For example, in the case of powder that easily oxidizes or powder that may explode, nitrogen gas, argon gas, or the like is used.

In the above-mentioned air tapping operation, the low pressure state and the high pressure state are the states in which the low pressure state and the high pressure state are relatively low in comparison with each other. When the air changes from the low pressure state to the high pressure state, the packing density of the powder p increases. Typically, a low pressure state is 0.1 to 0.5 atmosphere and a high pressure state is 0.6 atmosphere.
~ 1.0 atm.

Further, when the time period from the high pressure state to the low pressure state once and the time to return to the high pressure state is one cycle of air tapping, the period is typically 0.1 to 1 second and 5 times.
It can be filled in 10 cycles. In order to perform air tapping in such a short cycle, it is easy to use the above-mentioned ejector type vacuum generator. That is, when the compressed air is sent to the ejector type vacuum generating device, the low pressure state is established, and when the compressed air is stopped, the high pressure state is established immediately. This is because the compressed air gas released earlier flows backward and the pressure rises. When the compressed air is sent intermittently (by valve operation), air tapping is performed in the above-described cycle. Of course, in consideration of the size and shape of the closed space or the closed space or the fluidity of the material to be filled, the above cycle can be appropriately lengthened or shortened, or the number of cycles can be reduced. It can be increased or decreased.

By rapidly performing the above-described repeated work in the low pressure state and the high pressure state, a large amount of powder p can be effectively and quickly densified in the closed space 4d of the split mold 4. Can be filled. Further, the guide hole 5a of the tubular guide member 5 and the split hole are reduced as compared with the pressure of the guide hole 5a of the tubular guide member 5 and the closed space 4d of the split mold 4 to be a low pressure state. Type 4
By increasing the speed of introducing air into the closed space 4d, it is possible to more effectively perform high-density packing of the powder.

After the air tapping work as described above is completed, as shown in FIG. 2 (c), the punch 7 as a pressing body is inserted into the guide hole 5a of the tubular guide member 5, Further, the powder p is densified.

Green compact C molded as described above
The cylindrical guide member 5, the lid member 6 and the punch 7 are removed, and the two mold members 4a and 4b are separated as shown in FIG.
Remove from After that, the part W is manufactured by sintering the green compact C taken out.

Conventionally, after filling an appropriate amount of powder p shown in FIG. 2 (a) into the closed space 4d of the split mold 4 and the guide hole 5a of the tubular guide member 5 up to a predetermined height. , The punch 7 is inserted into the guide hole 5a and the powder p is filled in the closed space 4d of the split mold 4, but the pressing force of the punch 7 does not reach the powder p below and the vicinity of the punch 7 is reached. Powder p
In this case, the packing density of the powder p in the vicinity of the punch 7 increases, and a green compact C having a non-uniform packing density of the powder p is formed. In the present invention, since all or most of the powder p in the guide hole 5a of the tubular guide member 5 can be filled in the closed space 4d of the split mold 4 by the air tapping operation, the amount of lowering of the punch 7 is reduced. Therefore, there is almost no difference between the packing density of the powder p in the vicinity of the punch 7 and the packing density of the powder p in the lower portion, and a green compact C having a uniform packing density can be formed.

Further, since the powder is only pushed directly below by pressing the punch and the powder is not carried to the side portion,
For example, the portion corresponding to the spur gear 2 and the bevel gear 3 in FIG. 1 is not filled with powder. In such an uneven filling state, no matter how much the pressing force of the punch is increased, the side portions such as the portion corresponding to the spur gear 2 and the bevel gear 3 do not have the strength as green compacts. , Powder is not packed densely. Therefore, by molding a green compact as shown in Fig. 1,
Making parts by powder metallurgy has been extremely difficult.

In the present invention, it is possible to prevent the powder p from being spread to every corner of the closed space 4d of the split mold 4 by the air tapping operation, thus forming a defective green compact. As described above, the filling method of the present invention is as shown in FIG.
As described above, it is extremely effective as a means for filling powder in a closed space having a space protruding sideways.

Next, with reference to FIG. 3 which is a vertical sectional view of a die press for molding a cylindrical green compact, the method for filling an object to be filled according to the present invention is applied, which is thin and high in height. A method of forming a high cylindrical green compact will be described.

Reference numeral 8 is a die having a cylindrical space portion,
Reference numeral 9 denotes a cylindrical core arranged in the center of the cylindrical space portion of the die 8, and the upper end of the cylindrical core 9 is arranged so as to slightly project from the upper surface of the die 8. Reference numeral 10 denotes a lower punch that is fitted to the lower portion of a cylindrical space portion 11 formed between the inner peripheral surface of the die 8 and the outer peripheral surface of the cylindrical core 9. Then, the closed space 12 having the donut-shaped opening 12a is formed above by the lower punch 10 fitted to the inner peripheral surface of the die 8, the outer peripheral surface of the cylindrical core 9 and the lower portion of the cylindrical space portion 11. To be done. Reference numeral 13 denotes a tubular guide member placed on the upper surface of the die 8, and the guide hole 13 a of the tubular guide member 13 is provided.
Has a diameter substantially the same as the diameter of the cylindrical space portion of the die 8. The upper end portion of the guide hole 13a of the tubular guide member 13 is preferably formed on the inclined surface 13b which is expanded to facilitate the supply of the powder to the guide hole 13a.

Reference numeral 14 denotes a lid member which is covered with the cylindrical guide member 13 in a hermetically sealed manner, and a hole 14a formed in the central portion of the lid member 14 has an appropriate O-ring or the like (not shown). The cylindrical upper punch 15 inserted into the above-mentioned cylindrical space portion 11 is vertically movably inserted through the seal member. Further, the lid member 14 has an appropriate number of through holes 14b.
And a connecting pipe 14c is connected to the through hole 14b. The connecting pipe 14c is connected to a pump device (not shown) such as an ejector type vacuum generator.

As shown in FIG. 3A, the die 8
After the cylindrical guide member 13 is placed on the upper surface of the above, an appropriate amount of powder p is supplied to the closed space 12 and the guide holes 13a of the cylindrical guide member 13 by an appropriate supply device (not shown).
Supply up to a predetermined height.

Next, as shown in FIG. 3B, the cylindrical guide member 13 is covered with the lid member 14 in a hermetically sealed manner. Then, the pump device is operated to close the closed space 12 as the closed space and the guide hole 13 of the tubular guide member 13.
By alternately performing the above-mentioned air tapping in which a is set to a low pressure state and a high pressure state, most of the powder p supplied to the guide hole 13a of the cylindrical guide member 13 is filled in the closed space 12. . The upper punch 15 does not move during the above air tapping operation.

The upper portion of the cylindrical upper punch 15 is closed so that air does not escape from the closed space during the air tapping operation. In addition, air should not escape between the die 8 and the lower punch 10 and between the cylindrical core 9 and the lower punch 10.
Rubber packing etc. is installed and sealed, but if the clearance is made small and air escapes from the gap, a small amount,
It is necessary that the necessary low pressure state and high pressure state can be formed.

After the air tapping work as described above is completed, as shown in FIG. 3 (c), the upper punch 15 as a pressing body is inserted into the guide hole 13a of the tubular guide member 13, Further, by inserting the upper punch 15 into the cylindrical space portion formed between the inner peripheral surface of the cylindrical guide member 13 and the outer peripheral surface of the cylindrical core 9 protruding from the upper surface of the die 8, the guide hole 13a is formed. All of the powder p remaining in (1) is filled in the closed space 12, and pressure is applied to the lower punch 10 and the upper punch 15 to form a green compact.

After that, the upper punch 15 and the lid member 14 are removed, and if necessary, the cylindrical guide member 13 is removed from the upper surface of the die 8, and then the lower punch 10 is moved upward to form a shape. The cylindrical green compact is removed from the die 8.

When a long and thin cylindrical powder compact is formed by conventional die molding, a deep cylindrical closed space 12 formed by the cylindrical core 9, die 8 and the like.
Powder p was filled in and powdered by the lower punch 10 and the upper punch 15 (hereinafter, also simply referred to as "upper and lower punches 15 and 10"). Since many powders p are less likely to be clogged and easily form a bridge, the depth of the closed space 12 is often required to be approximately three times the height of the final green compact. Thus, not only is it extremely difficult to introduce the powder p into the deep closed space 12, but when the amount of movement of the upper and lower punches 15 and 10 is large, the powder p is bitten and the productivity is reduced. However, there were many problems such as breaking the mold.

In the present invention, as shown in FIG. 3, a high-density filling state of the powder p is formed before compaction by the upper and lower punches 15 and 10. The distance traveled by 15 and 10 may be small. Therefore, there is no concern that the powder p will be bitten, and productivity and life can be improved.

Further, conventionally, the pressing force of the upper and lower punches 15 and 10 does not reach the powder p located apart from the upper and lower punches 15 and 10, but concentrates on the powder p near the upper and lower punches 15 and 10. Then, the green compacts having an uneven packing density of the powder p are formed by increasing the packing density of the powder p around the upper and lower punches 15 and 10. In the present invention,
By the air tapping operation, all or most of the powder p in the guide hole 13a of the tubular guide member 13 is closed.
2 can be filled, so the upper and lower punches 15, 10
Movement of the upper and lower punches 15, 1
The difference between the packing density of the powder p near 0 and the packing density of the parts apart from the upper and lower punches 15 and 10 is reduced, and a green compact having a uniform packing density can be molded.

One major advantage of the filling method of the present invention is that
That is, the powder p that has been accurately weighed in advance by precision weighing or the like can be put into a mold to form a green compact without leaving any residue. As a result, it is possible to mold a green compact having no product variations.

Next, a vertical cross-sectional view of a pressure vessel, a rubber mold, etc., of an embodiment in which the method for filling a filling material of the present invention is applied to a method for molding a cylindrical green compact by a dry hydrostatic pressing method. This will be described with reference to FIG.

Reference numeral 16 is a pressure vessel, and the pressure vessel 16
Is an appropriately shaped hole 16b ′ in the side wall 16a and the central portion,
16 c ′ has upper and lower walls 16 b and 16 c opened, and a pressure rubber mold 16 d is hermetically arranged so as to connect the holes 16 b ′ and 16 c ′ of the upper and lower walls 16 b and 16 c. . A closed space 16e of the pressure vessel 16 is formed by the side wall 16a, the upper and lower walls 16b and 16c, and the pressure rubber mold 16d, and a fluid is injected into the closed space 16e from a fluid introduction pipe 16f arranged in the side wall 16a. It is configured to be. Reference numeral 17 denotes a cylindrical molded rubber die mounted in the pressure rubber die 16d. 18 is a molded rubber mold 17
The core is disposed in the central portion of the core 18, and the outer peripheral surface of the core 18 and the inner peripheral surface of the molding rubber die 17 form a cylindrical space portion. A cylindrical lower punch 19 is inserted into the lower portion of the cylindrical space formed by the outer peripheral surface of the core 18 and the inner peripheral surface of the molding rubber die 17, and the outer peripheral surface of the core 18 and the molding rubber die 17 are formed. A cylindrical space surrounded by the inner peripheral surface of 17 and the lower punch 19 forms a closed space 20. In addition, 1
6b ″ is an annular member that constitutes the upper wall 16b, and is configured so that the molding rubber mold 17 is mounted on the upper end portion of the molding rubber mold 17 after being mounted in the pressure rubber mold 16d. Reference numeral 21 is a cylindrical guide member having a guide hole 21a placed on the upper wall 16b of the pressure vessel 16.

As shown in FIG. 4 (a), an appropriate amount of powder p weighed by an appropriate supply device (not shown) is introduced into the closed space 20 and the guide hole 21a of the tubular guide member 21. , To a predetermined height. The pressure vessel 16 is filled with a fluid such as oil.

Next, as shown in FIG. 4 (b), the cylindrical guide member 21 is covered with the lid member 22 in a hermetically sealed manner. A proper number of through holes 22a are formed in the lid member 22, and a connecting pipe 22b is connected to the through holes 22a. The connecting pipe 22b is connected to a pump device (not shown). After covering the cylindrical guide member 21 with the lid member 22 in a sealed manner, the closed space 20 as the closed space and the guide hole 21a of the cylindrical guide member 21 are alternately set to a low pressure state and a high pressure state, By performing the air tapping as described above, the closed space 20 is filled with the powder p filled in the guide hole 21a of the tubular guide member 21.

Next, after removing the lid member 22, a cylindrical upper punch 23 is inserted into the guide hole 21a of the cylindrical guide member 21 as shown in FIG. The position of the upper surface of the powder p filled in is adjusted. A recess 23 a to be inserted into the tip of the core 18 is formed in the lower portion of the upper punch 23.

Next, from the fluid inlet 16f to the pressure vessel 1
6, the fluid is further introduced, and the molding rubber mold 17 is introduced from the outside.
Then, the powder p filled in the closed space 20 is compression-molded. After compression molding of powder p, fluid inlet 1
The introduction of the fluid from 6f into the pressure vessel 16 is stopped to release the pressure to the molding rubber die 17, and the upper punch 23
After removing the tubular guide member 21 and the lower punch 19,
Is moved upward or the like to take out the molded cylindrical green compact from the molding rubber mold 17.

Conventionally, in a long thin cylindrical closed space,
Since it is difficult to uniformly fill the powder, it is necessary to granulate the powder, and even if the granulated powder is used, it takes a long time to fill the powder and the productivity is low. In addition, granulation is often unfavorable due to residual carbon.
When the dry hydrostatic pressing as in this example is performed in a state where the powder is not uniformly filled, the wall thickness of the cylindrical green compact changes depending on the location, and a cylindrical green compact with a distorted shape is obtained. Will end up. By applying the present invention, uniform filling without granulation,
It will be possible to do it quickly, and dry isostatic pressing will allow efficient production of green compacts without distortion.

In the previous application, the applicant of the present invention has proposed a granulation method using a rubber mold and an apparatus therefor (see JP-A-6-142487). In the conventional granulation method, powder is loaded on the upper surface of the rubber mold in which a large number of cavities are formed, and then the upper surface of the rubber mold is scraped off with a plate-like spatula to form a cavity in the rubber mold. It is designed to be filled with powder. As described above, the method of filling powder into the cavities of the rubber mold by scraping has a problem that the powder is not necessarily filled uniformly in all the cavities.

Therefore, an embodiment in which the filling method of the object to be filled according to the present invention is applied to the above-described granulation method using a rubber mold will be described with reference to FIG. 5, which is a vertical sectional view of a die, a rubber mold and the like. To do.

Reference numeral 24 is a cylindrical die, and 25 is a lower punch attached to the die 24. 26 is a large number of cavities 26 mounted on the upper surface, which are mounted in a recess 27 formed by the die 24 and the lower punch 25 mounted on the die 24.
It is a rubber mold in which a is formed. 28 is the die 24
Is a cylindrical guide member placed on the upper surface of the. In this embodiment, the cavity 26a itself having the opening is
The closed space in the above-mentioned embodiment will be formed. Reference numeral 29 is a backup ring fitted in the upper corner of the lower punch 25.

First, as shown in FIG. 5A, a cylindrical guide member 28 mounted on the upper surface of the die 24.
Then, a predetermined amount of the powder p is supplied, and the powder p is loaded on the upper surface of the rubber mold 26. Next, as shown in FIG. 5B, the cylindrical guide member 28 is covered with the lid member 30 similar to that described with reference to FIG. A closed space is formed above the powder p supplied to the member 28. Then, the cavity 26a is filled with the powder p by performing air tapping through the connecting pipe 30b connected to the through hole 30a formed in the lid member 30 and connected to the pump device.

After the air tapping is performed a predetermined number of times, as shown in FIG. 5 (c), the tubular guide member 28 is removed, and a spatula 31 is used to perform a cutting operation. Thereafter, an upper punch (not shown) is placed on the upper surface of the die 24, and the rubber mold 2 is placed between the lower punch 25 and the upper punch.
6 is compressed and the powder p is granulated. In this embodiment, since the powder p is filled in the cavities 26a by air tapping, the powder p can be filled in all the cavities 26a evenly and at a uniform packing density. Granulation can be performed, and the granulation work can be performed quickly.

Next, square-shaped cut seaweed, thinly baked rice crackers, foil-like bodies (hereinafter simply referred to as "foil-like bodies"),
An embodiment of the method for filling an object to be filled according to the present invention applied when filling a can will be described with reference to FIG.

32 is a can having an opening 32a at the top and a closed space 32b, and 33 is a can 3.
2 is a cylindrical guide member placed on the upper edge portion of 2.

As shown in FIG. 6A, an appropriate amount of foil-like body f is supplied to the middle of the can 32 and the cylindrical guide member 33 by a supply device (not shown). Next, as shown in FIG. 6B, the upper end of the tubular guide member 33 is covered with a trumpet tube 34, the end portion of which is connected to the pump device, so that the tubular guide member 3 is sealed.
A closed space portion is formed above the foil-like body f supplied to the sheet 3. Then do the air tapping as described above,
All the foil-like bodies f filled in the tubular guide member 33 can be
Fill in 2.

In the present embodiment, a pressing body such as a pusher is not directly pressed against the foil-like body f so that the can 32 is filled with the foil-like body f. Without damaging. Further, in this embodiment, since a large power source for vibrating the can 32 on which the tubular guide member 33 is placed is not required, there are advantages such as soundproofing and energy saving.

Next, an embodiment of the method of filling the object to be filled of the present invention which is applied when the powder or the granular material is filled in the bag made of synthetic resin or paper, the bag holding container, the tubular shape This will be described with reference to FIG. 7, which is a vertical sectional view of the guide member and the like.

Reference numeral 35 denotes a bag holding container having an opening at the top, which has a proper number of through holes 35a formed in its side wall.
A suction pipe 36 connected to an air suction source (not shown) is connected to. 37 is a bag mounted in the bag holding container 35, and the bag mouth 37a is placed on the upper end of the bag holding container 35. Reference numeral 38 denotes a tubular guide member placed on the upper end of the bag holding container 35. In the present embodiment, the bag mouth 37a of the bag 37 is the above-mentioned opening, and the inside of the bag 37 forms a closed space.

As shown in FIG. 7A, when the powder p is supplied to the bag 37 mounted in the bag holding container 35 by the supply device (not shown), an air suction source is used. The bag 37 is operated to suck and hold the bag 37 on the inner surface of the bag holding container 35 through the suction pipe 36. In this way, the bag 37 is sucked and held on the inner surface of the bag holding container 35, so that the bag 3
7 can be sufficiently expanded, and the movement of the bag 37 can be suppressed during the air tapping operation described later. Then, an appropriate amount of powder p is supplied to the middle of the bag 37 and the tubular guide member 38. Next, as shown in FIG. 7B, the upper end of the tubular guide member 38 is covered with a trumpet tube 39 having an end connected to the pump device in a hermetically sealed manner, so that the tubular guide member 38 is closed. A closed space is formed above the powder p supplied to the. Then, as mentioned above,
Air tapping is performed to fill the bag 37 with the powder p.

As described above, in this embodiment, the bag holding container 35 to which the suction tube 36 is connected is vibrated,
Since it does not tap, a large power source is not required and the durability of the bag holding container 35 and the like is improved. Moreover, since the powder p can be effectively prevented from bridging and the powder p can be uniformly and densely packed, the portion having a low packing density is deformed after the bag mouth 37a is sealed. There is no.

In the above-described embodiment, after the filling object is supplied to the closed space and the tubular guide member, air tapping is performed so that the filling object in the tubular guide member is filled in the closed space. Although an example is shown, it is also possible to supply the filling material only to the closed space and then perform air tapping to configure the filling material in the closed space more densely and compactly. . In this case, the closed space is directly covered with the lid members 6, 22, 30 as shown in FIGS. 2, 4 and 5, or the closed space is directly connected to the closed space shown in FIG. The trumpet tubes 34, 3 as shown in FIG.
After placing 9, the air tapping operation is performed.

Next, in the case where the powder p is densely filled in the split rubber mold 40 made of rubber, the split rubber mold 4 is applied to the embodiment to which the filling method of the present invention is applied.
This will be described with reference to FIG. 8 which is a vertical cross-sectional view of 0 or the like.

In this embodiment, the split rubber mold 4 is used.
0 is the two mold members 40a, 4a arranged vertically.
The opening 40 is divided into 0b and is supplied with the powder p.
c is formed laterally. As an example, a green compact molded by the split rubber mold 40 shown in FIG. 8 is provided with a truncated cone portion at its tip, and a thick shaft and a thick shaft are provided on the large diameter side of the truncated cone portion. The thin shafts are continuously connected. Reference numeral 41 is a powder supply tank having a powder supply port 41a in the upper portion thereof. The powder supply tank 41 includes a pipe 41b connected to the opening 40c of the split rubber mold 40 and the powder supply tank 41, which is an ejector type vacuum generator. A pipe 41c connected to the pump device 42 such as the above is provided.

First, as shown in FIG. 8A, the powder p is supplied from the powder supply port 41a of the powder supply tank 41. Next, as shown in FIG. 8B, the shutter 4 arranged below the powder supply port 41a.
Close 3. In this way, the closed space 40 of the split rubber mold 40 having a space corresponding to the green compact to be molded.
d and the powder supply tank 4 closed by the shutter 43
1 and 1 form a closed space. Next, as described above, the pump device 42 such as an ejector type vacuum generator is operated to open the closed space 40d of the split rubber mold 40 and the closed space formed by the powder supply tank 41 closed by the shutter 43. The powder p is changed to a low pressure state and a high pressure state by repeating an appropriate number of times, as shown in FIG.
The closed space 40d of the split rubber mold 40 is filled.

FIG. 8 shows an embodiment in which one split rubber mold is connected to the powder supply tank 41 via a pipe 41b. However, a plurality of pipes 41b are connected to the powder supply tank 41. It is also possible to connect a plurality of split rubber molds 40 through them and simultaneously fill the closed spaces 40d of the plurality of split rubber molds 40 with the powder p at a high density.

After the powder p is filled into the closed space 40d of the split rubber mold 40 with high density by air tapping, the split rubber mold 40 filled with the powder p is removed from the pipe 41b of the powder supply tank 41. The entire split rubber mold 40 filled with the powder p is covered with a rubber sheet and vacuum-sealed. Next, the vacuum-sealed split rubber mold 40 is immersed in a pressure container of a wet hydrostatic device, and a hydraulic pressure is applied to the pressure container to apply pressure to the split rubber mold 40 from the outside to split the split mold. Rubber mold 4
The powder p filled in 0 is solidified to form a green compact. After taking out the vacuum-sealed split rubber mold 40 from the pressure container of the wet hydrostatic device, the rubber sheet is removed, and the two mold members 4 of the split rubber mold 40 are removed.
0a and 40b are divided and the molded green compact is taken out. The green compact molded in this way becomes a strong powder metallurgy product through a sintering process and the like.

By the air tapping of the present invention, the opening 40 of the split rubber mold 40 as shown in FIG.
Even if c is provided on the side or the opening 40c is narrow, it is possible to reliably fill the closed space 40d of the split rubber mold 40 with the powder p at a high density.

In the above-described embodiment, the case where the powder p is filled in the closed space 40d of the split rubber mold 40 has been described, but instead of the split rubber mold 40, the powder or the like is put in a container such as a bottle or a can. It is also effective as a technology for packing. Moreover, since a plurality of containers can be radially mounted around the powder supply tank 41 and the powder or the like can be injected into the plurality of containers at the same time, efficient filling is possible.

[0065]

Since the present invention is constructed as described above, the following effects can be obtained.

Since the object to be filled is filled in the closed space by air tapping, the density of the object to be filled can be made uniform.

Since the object to be filled is filled in the closed space by air tapping, the object to be filled can be filled at high density and quickly without damaging the object to be filled.

Since the object to be filled is filled in the closed space by air tapping, the bridge in the object to be filled can be effectively removed without damaging the object to be filled.

Since the object to be filled is filled in the closed space by air tapping, even if the closed space is three-dimensionally complicated, the closed space has a laterally long side portion. Alternatively, even if the closed space is deep and narrow, the object to be filled can be quickly and uniformly filled in every corner of the space.

Since the object to be filled is filled in the closed space by tapping with air, all the accurately weighed powder can be filled in the predetermined closed space in advance, so that the filling amount is always constant. Therefore, it is possible to eliminate the cause of product variations and the like.

Since the object to be filled is filled in the closed space by the air tapping, the cylindrical guide member, the core, etc. can be shortened. Therefore, the device can be downsized, and the operability and work of the device can be reduced. It is possible to improve the property.

Since the object to be filled is filled in the closed space by the air tapping, there is no need to vibrate or tap the devices such as the pressure vessel, the mold, the cylindrical guide member and the die. It is possible to improve sound durability and save energy while improving durability.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a component manufactured by subjecting a molded green compact to a sintering process or the like.

FIG. 2 is a vertical cross-sectional view of a split mold or the like for molding a green compact as an example to which the method for filling an object to be filled according to the present invention is applied.

FIG. 3 is a vertical cross-sectional view of a die press for molding a cylindrical green compact as an example to which the filling method of the filling object of the present invention is applied.

FIG. 4 is a pressure vessel in a dry hydrostatic pressing method as an example to which the method for filling an object to be filled according to the present invention is applied,
It is a vertical sectional view of a rubber mold and the like.

FIG. 5 is a vertical cross-sectional view of a die, a rubber mold, etc. in a granulation method as an example to which the method of filling an object to be filled according to the present invention is applied.

FIG. 6 is a vertical cross-sectional view of a can, a cylindrical guide member and the like as an example to which the method for filling an object to be filled according to the present invention is applied.

FIG. 7 is a vertical cross-sectional view of a bag holding container, a cylindrical guide member and the like as an example to which the filling method of the object to be filled of the present invention is applied.

FIG. 8 is a vertical cross-sectional view of a split rubber mold, a powder supply tank, etc. for molding a green compact as an example to which the method for filling an object to be filled of the present invention is applied.

[Explanation of symbols]

f ・ ・ ・ ・ Foil-like body p ・ ・ ・ ・ ・ ・ ・ ・ Powder 4 ・ ・ ・ ・ ・ ・..... Split mold 5, 13, 21, 28, 33, 38 ... Cylindrical guide member 6, 14, 22, 30 ... Lid member 7 ...・ ・ ・ ・ ・ ・ ・ ・ Punch 8, 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Die 9, 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 10, 19, 25 ・ ・ ・ ・ ・ Lower punch 15, 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Upper punch 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..Pressure vessel 17 ... Molding rubber mold 26 ... Rubber mold 31 ...・ ・ ・ ・ Spatula 32 ・ ・ ・ Cans 34, 39 ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wrapper tube 35 ・ ・ ・ ・ ・ Bag holding container 36 ・ ・ ・ ・ ・Suction tube 37 ... Bag 40 ... Split rubber mold 41 ...・ ・ ・ ・ ・ ・ ・ ・ Powder supply tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Nagata 1 Ellie Part 2 401, 22-1, Matsumuro Ouegami-cho, Nishikyo-ku, Kyoto City, Kyoto Prefecture (72) Inventor Toshihiro Watanabe Nishikyo, Kyoto City, Kyoto Prefecture 1 Ellie Part 2 at No. 401, Omakami-cho, Matsumuro-ku, No. 401, Intermetalix Co., Ltd. (72) Inventor, Terumasa Miyoshi, 3-day Honden Electromagnetic Instruments Co., Ltd. at 8-61, Sunagawa-cho, Tachikawa, Tokyo (72) Inventor Mizuho Kasahara 3 days at 8-61 Sunagawa, Tachikawa, Tokyo

Claims (7)

[Claims] 1. A closed space is provided by supplying an object to be filled into a closed space including a closed space having an opening and alternately performing air tapping in the closed space to a low pressure state and a high pressure state. A method for filling an object to be filled, characterized in that the object to be filled is filled with a high density. 2. A closed space is provided by supplying an object to be filled into a closed space having an opening, and by alternately air-tapping the closed space including the closed space into a low pressure state and a high pressure state. A method for filling an object to be filled, comprising filling the object to be filled at a high density. 3. A tubular guide member is placed in a closed space having an opening, a filling object is supplied to the closed space and the tubular guide member, and the closed space and the tubular guide member are alternately provided. ,
A method for filling an object to be filled, characterized in that the object to be filled is densely filled in a closed space by performing air tapping in a low pressure state and a high pressure state. 4. The filling target according to claim 1, wherein the flow velocity of the gas in the high pressure state is higher than the flow velocity of the gas in the low pressure state. How to fill things. 5. The method for filling an object to be filled according to claim 1, wherein the closed space is a space portion formed in the mold. 6. The method for filling an object to be filled according to claim 1, wherein the closed space is a space portion formed in a rubber mold. 7. The method for filling an object to be filled according to claim 1, wherein the closed space is a container.