JPH04258398A - Method and device for molding and taking out powder compact - Google Patents

Abstract

PURPOSE:To prevent the powder from splashing and to easily take the compact out by moving the top end of rod which forms the lower bottom of the mold cavity with two pieces of series cylinders of the lower side with two steps and at the same time. CONSTITUTION:The press machine 6 is arranged at the upper side, the rod which forms the lower bottom of the mold cavity 2 is arranged at the lower side by inserting the mold cavity 2, and the rod is lowered with the series cylinders 8, 9 of the upper and lower two layers with two steps. The upper surface of the powder body is lowered a little during the pressurizing time in the mold, and the compact is pushed up a little once at the taking out time of the compact by moving both cylinders together, then pushed out from the mold only with the upper layer cylinder. Therefore, the powder is prevented from splashing to the outside of the mold, and the compact can be taken out surely and easily.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to the production of cemented carbide tool parts by pressure molding of pharmaceutical fine powder or by pressure (sintering) of ceramic raw material powder. A method and device for press-molding powder at high pressure or ultra-high pressure without using it, which does not cause scattering of powder during pressurization and allows easy removal of the press-formed body using a small device. It is related to.

0002

[Prior Art] Conventionally, when this type of powder is pressure-formed in a mold, if the tip of the rod (punch) of the press is convex, hemispherical, tapered, etc. There were problems in that the molded powder would fly out and scatter around the surroundings, making it impossible to obtain a uniform molded product, and that the molded powder would stick inside the mold due to high pressure and could not be easily taken out.

0003

[Problems to be Solved by the Invention] As described above, the present invention has a structure that prevents powder from scattering during pressurization, and that can be easily removed even if the powder that has been pressure-molded is stuck in the mold. It is something to do.

0004

[Means for Solving the Problems] That is, in the present invention, a press machine is placed on the upper side of a mold hole for pressure-molding powder, and a rod that forms the bottom of the mold hole is placed on the lower side. , the rod is lowered in two stages by upper and lower layers of serial cylinders,
When pressurizing the powder in the mold, the top surface of the powder is lowered a little, and when removing the powder after pressure molding, the above-mentioned upper and lower two cylinders are operated together, and once high output is applied. After the molded powder is pushed up a little, it is then pushed out of the mold using only the output of the upper cylinder. Hereinafter, a practical example of the present invention will be explained with reference to the drawings.

[0005]

[Example] Fig. 1 shows an example of an apparatus for carrying out the method of the present invention, in which 1 is a molding tool installed on a base 12, and the central part of the molding tool 1 is used for loading powder 18. A mold hole 2 penetrating above and below is opened, and the upper surface of the hardware 1 is configured to be flush with the surface of a table 3. On the table 3, a powder 18 is supplied into the mold hole 2 by driving a cylinder 5. In order to do this, a sliding metal fitting 4 is arranged which is horizontally movable in the two directions of the mold hole.

Reference numeral 6 denotes a press machine consisting of a downward pneumatic or hydraulic cylinder fixed above the mold cavity 2, and the tip 7a of the rod 7 is formed in a hemispherical shape and penetrates into the mold cavity 2 to a predetermined depth. It is possible.

Reference numeral 8 denotes an upper pneumatic or hydraulic cylinder which is supported and fixed upward on the base 12 so as to face the press machine 6 with the metal mold 1 therebetween, and its piston rod 9
The tip 9a of the mold hole 2 is always inserted tightly into the mold hole 2 so as to penetrate through the base 12 and form the bottom part of the mold hole 2, and its rising end is configured to match the upper surface of the mold metal object 1. ing.

Reference numeral 10 denotes a lower cylinder installed in series below the upper cylinder 8. The cylinder 10 has an inner diameter equal to or larger than that of the upper cylinder 8, and has a short stroke length. The tip of the piston rod 11 of the cylinder 10 is inserted into the upper cylinder 8, and both the upper and lower cylinders 8, 1
Depending on how the rod 9 is driven, it can abut against or separate from the lower end of the rod 9 of the upper cylinder 8. That is,
When the upper rod 9 is at the rising end, the lower rod 11 is separated from the lower end of the upper rod 9 even at the rising end due to the above stroke length relationship.

A collar 13 is fixed to the middle part of the upper rod 9 above the base 12 and below the mold hole 2, and the collar 13 is opened below the mold hole 2 in the mold 1. The stroke length of the rod 9 is actually regulated by the stroke length of the collar 13, and the load when pressurizing powder is also controlled by the collar 13.
It is supported by pressure on the top.

Reference numeral 14 denotes a contact plate having a powder supply hopper 15 on its upper part and floatingly fixed above the table 3 on the side of the mold hole 2 position. The mold hole 2 is clamped onto the table 3 by a cylinder 5 installed and fixed on the table 3 on the rear side of the hardware 4.
Powder supply holes 16 are formed in the intermediate part of the sliding metal fitting 4 and extend vertically and have a diameter slightly larger than that of the mold hole 2. When vertically aligns with the powder supply port 17 opened in the contact plate 14 for discharging the powder 18 in the hopper 15, the powder 18 flows into the supply hole 16, and the sliding hardware 4 is moved to the table 3. When the supply hole 16 is brought into contact with the mold hole 2 of the mold metal object 1, the powder 18 in the supply hole 16 flows into the mold hole 2 and fills it. It has become.

[0011]The operation of this device is shown in Figs.
To explain, the powder 18 to be press-molded in the mold cavity 2 is
When filling, first raise the rod 11 of the lower cylinder 10 of the two-layer series cylinder below the mold metal 1 to the rising end, and blow compressed air downward into the upper cylinder 8 to raise the upper end of the lower rod 11. By abutting the lower end of the rod 9 of the upper cylinder 8, the upper rod 9 is stopped at an intermediate position, and its tip 9a is placed at an intermediate position in the mold cavity 2, and in this state, the above-mentioned material is inserted into the mold cavity 2. Like sliding hardware 4
is advanced to inflow and fill with a predetermined amount of powder 18 (Fig. 2
).

Next, when the sliding metal fitting 4 retreats, the rods 9 and 11 of both the upper and lower cylinders 8 and 10 are lowered together in abutting state, and the upper rod tip 9a position in the mold hole 2 is moved into the hole 2. After lowering the upper surface of the powder 18 supplied into the hole 2 to a predetermined position, the press machine 6 above the mold hole 2 is operated to plunge the rod tip 7a into the mold hole 2. , the powder in the mold cavity 2 is compression molded 18a (Fig. 3).
.

During this time, the powder 18 is again supplied from the hopper 15 into the supply hole 16 of the sliding metal fitting 4.

When the pressure forming of the powder 18a is completed, the rod 7 of the press 6 rises, and then both the upper and lower cylinders 8,
10 are operated together to raise both rods 9 and 11 together in abutting state, the upper rod 9 moves up against the lower rod 1.
The rising force of 1 is also added, and the powder 18a in the mold cavity 2 is generated with a large output.
First push up (Figure 4). However, since the stroke length of the lower cylinder 10 is shorter than that of the upper cylinder 8, while the upper rod 9 is rising, the lower rod 11 reaches the rising end and stops, and after that, only the upper rod 9 is used to form the powder 18.
Push a up.

In this way, when the upper rod tip 9a rises and pushes out the molded powder 18a to the upper surface of the mold metal 1 (FIG. 5), the sliding metal 4 moves forward again and the front surface of the metal 4 is pushed out. While pressing the powder 18a, move it onto the surface of the table 3 on the side of the mold hole 2, and connect the supply hole 16 of the metal object 4 and the mold hole 2.
Due to this coincidence, the mold cavity 2 is again filled with a predetermined amount of powder 18 to be pressurized as described above.

FIG. 6 differs from the apparatus shown in FIG. 1 in that the piston rods of the upward series cylinders 8 and 10 below the mold cavity 2 are not constructed separately as described above, but that the upper and lower cylinders 8 and 10 are connected to each other. Another embodiment is shown in which a single elongated rod 19 is provided.

That is, the rod 19 is fixed to the piston 20 in the upper cylinder 8, but is not fixed to the piston 21 in the lower cylinder 10, and the lower end of the rod 19 is fixed to the piston 20 in the lower cylinder 10. It penetrates the lower base and protrudes downward. The upper surface of the lower piston 21 comes into contact with the lower end of the bulging step 19b formed at the intermediate portion of the rod 19 that moves up and down within the lower cylinder 10, and pushes up the rod 19 by the stroke. is now possible.

[0018] Therefore, the series cylinders 8, 1 in FIG.
In order to pressurize the powder 18 with the long rod 19 of 0, upward air (or oil) is first fed into the lower cylinder 10, and if necessary, downward air (or oil) is fed into the upper cylinder 8. so that the rod tip 19a is stopped at an intermediate position within the mold cavity 2.

Next, in the same manner as above, the sliding metal fittings 4
The mold cavity 2 is filled with powder 18 by the forward movement of the metal part 4, and then the metal part 4 is retreated, the air in the lower cylinder 10 is removed, and the air is sent downward only into the upper cylinder 8. This results in
The rod 19 descends, and its tip 19a falls to a predetermined position in the mold cavity 2, lowering the upper surface of the powder 18 in the mold cavity 2, and the lower piston 21 moves the lower end of the bulging step 19b in the middle of the rod 19. It is pressed down and slid down.

Next, after the powder 18 in the mold cavity 2 is pressure-molded by the rod tip 7a of the press 6, upward air is blown into both the upper and lower cylinders 8, 10, and the rod 19 is pressed against the upper piston 20. Simultaneously with the lifting force, the lower piston 21 is now engaged with the lower end of the rod bulging step 19b, and a lifting force is applied, and the large output from the total output of both cylinders 8 and 10 causes the inside of the mold cavity 2 to rise. First, the molded powder 18a is pushed up by the stroke of the lower cylinder 10. Thereby, even if the powder 18a adheres to the inner surface of the mold cavity 2, it can be easily pushed up and peeled off.

[0021]The lower piston 21 is connected to the cylinder 10.
Even when the rod 19 is brought into upward pressure contact with the upper bottom surface, upward air is continued to be blown into the upper piston 20, and the rod 19 is now raised only by the lifting force of the upper piston 20. At this time, since the lower piston 21 is not fixed to the rod 19, the portion of the rod 19 below the lower end of the bulging step portion 19b simply slides upward within the lower piston 21. As a result, the upper end 19a of the rod reaches the upper end inside the mold cavity 2, and the molded powder 1
Once the powder 8a has been extruded onto the upper surface of the mold metal 1, the molded powder 18a is pressed and moved laterally on the front surface of the sliding metal 4 by advancing the sliding metal 4 in the same manner as described above.

[0022]

[Effects of the Invention] The present invention is constructed as described above, and the tip of the rod constituting the lower bottom of the mold hole is temporarily stopped at an intermediate position within the mold hole by operating two lower series cylinders, and the powder is removed. After filling a predetermined amount into the hole, the powder is further lowered to the lower part of the hole, and the top surface of the powder is lowered slightly, and the press rod is used to press the powder, so even if the tip of the press rod is convex or hemispherical, No matter the shape, the powder will not scatter around during molding, and even amounts can be reliably pressure-molded one after another, and even if the powder sticks to the inner surface of the mold hole during pressure-forming. When extruding the molded powder, first operate both cylinders in series and use high output to peel the powder from the inner surface of the mold cavity and push it up slightly to create a trigger for extrusion. Since extrusion outside the mold hole is carried out using only the output of the cylinder, extrusion of the molded powder is not only reliable and easy, but also allows the powder to be extruded to the end with one large output cylinder. It has advantages such as being more economical and making it easier to downsize the entire device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an apparatus for implementing the method of the present invention.

FIG. 2 is an explanatory diagram of the first stage showing the gist of the method of the present invention.

FIG. 3 is an explanatory diagram of the second stage showing the gist of the method of the present invention.

FIG. 4 is an explanatory diagram of the third stage showing the gist of the method of the present invention.

FIG. 5 is an explanatory diagram of the fourth stage showing the gist of the method of the present invention.

FIG. 6 is an explanatory diagram showing the main parts of another apparatus for carrying out the method of the present invention.

[Explanation of symbols]

1-type hardware 2-Mold hole 3-table 4-Sliding hardware 5-cylinder 6-Press machine 7-Press rod 8-Upper cylinder 9-Upper rod 10-Lower cylinder 11-Lower rod 12- Base 13-Tsubakin 14-Contact plate 15-Hopper 16-Powder supply hole 17-Powder supply port 18-Powder 19-Long rod 20-Upper piston 21-Lower piston

Claims (4)

[Claims] Claim 1: A press machine is placed on the upper side of a mold hole for pressure-molding powder, and a rod forming the bottom of the mold hole is placed on the lower side, and the rod is connected to two upwardly facing serially arranged press machines. The upper end of the cylinder is configured so that it can be stopped at an intermediate position within the mold cavity, and the mold cavity is first filled with powder at the intermediate position, and then the upper end of the rod is lowered to the lower part of the mold cavity to form the mold cavity. After lowering the upper surface of the powder inside the mold, the press rod of the press machine is thrust into the mold cavity to pressure-form the powder, and then both of the series cylinders are operated to form the powder inside the mold cavity with high output. 1. A method for molding and ejecting a powder compact, characterized in that the powder is pushed up a little and then extruded out of the mold hole using only the output of one cylinder. [Claim 2] A press machine equipped with a press rod that protrudes into the mold hole at the upper side, sandwiching a mold metal article having a mold hole penetrating the upper and lower sides for pressure-molding the powder, and a press machine at the lower side. Two cylinders supported and fixed upward are arranged in series, and the rod tip of the upper cylinder is always movable up and down within the mold hole to form the bottom of the mold hole,
The lower cylinder has the same diameter or more as the upper cylinder and a shorter stroke length than the upper cylinder, and when the tip of the rod of the lower cylinder is inserted into the upper cylinder and the rod of the upper cylinder rises, the lower end of the upper rod Forming of a powder press-molded body having a length that separates from the butt
Retrieval device. [Claim 3] A press machine equipped with a press rod that protrudes into the mold hole on the upper side and a press rod that penetrates into the mold hole on the upper side, sandwiching the mold metal having a mold hole that passes through the upper and lower sides for pressure-molding the powder, and on the lower side. Two series cylinders supported and fixed upward are arranged, and the tip of one long piston rod passing through the series cylinders always moves up and down within the mold cavity to form the bottom of the mold cavity, The rod is not fixed to one piston of the series cylinder, but the piston can press against the lower end of the bulging stage formed at the middle of the rod. . 4. On a table formed on the same surface as the upper surface of the mold metal object, the table is driven by a cylinder and can freely slide in the direction of the mold hole while the upper surface is in contact with a corrosion plate floating and fixed above the table. A sliding metal fitting is arranged, a powder supply hole penetrating vertically is opened in the middle part of the sliding metal piece, and a powder supply port is opened in the contact plate and matches the supply hole of the sliding metal piece. When the powder in the hopper installed on the upper side flows into the supply hole, when the sliding metal advances and the supply hole matches the mold hole of the mold metal, the powder in the supply hole flows into the supply hole. 5. The apparatus for molding and taking out a powder press-molded body according to claim 3, wherein the apparatus is configured such that the powder flows into and fills the mold cavity.